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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
3,600 |
1905.02296
|
Leonardo Teixeira
|
Leonardo Teixeira, Brian Jalaian and Bruno Ribeiro
|
Are Graph Neural Networks Miscalibrated?
|
Presented at the ICML 2019 Workshop on Learning and Reasoning with
Graph-Structured Data
| null | null | null |
cs.LG cs.CV stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Graph Neural Networks (GNNs) have proven to be successful in many
classification tasks, outperforming previous state-of-the-art methods in terms
of accuracy. However, accuracy alone is not enough for high-stakes decision
making. Decision makers want to know the likelihood that a specific GNN
prediction is correct. For this purpose, obtaining calibrated models is
essential. In this work, we perform an empirical evaluation of the calibration
of state-of-the-art GNNs on multiple datasets. Our experiments show that GNNs
can be calibrated in some datasets but also badly miscalibrated in others, and
that state-of-the-art calibration methods are helpful but do not fix the
problem.
|
[{'version': 'v1', 'created': 'Tue, 7 May 2019 00:05:31 GMT'}
{'version': 'v2', 'created': 'Mon, 3 Jun 2019 14:10:50 GMT'}]
|
2019-06-04
|
[array(['Teixeira', 'Leonardo', ''], dtype=object)
array(['Jalaian', 'Brian', ''], dtype=object)
array(['Ribeiro', 'Bruno', ''], dtype=object)]
|
3,601 |
2205.00222
|
Randy Harsuko
|
Randy Harsuko and Tariq Alkhalifah
|
StorSeismic: A new paradigm in deep learning for seismic processing
|
18 pages, 18 figures
| null |
10.1109/TGRS.2022.3216660
| null |
cs.LG eess.SP physics.comp-ph physics.geo-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Machine learned tasks on seismic data are often trained sequentially and
separately, even though they utilize the same features (i.e. geometrical) of
the data. We present StorSeismic, as a framework for seismic data processing,
which consists of neural network pre-training and fine-tuning procedures. We,
specifically, utilize a neural network as a preprocessing model to store
seismic data features of a particular dataset for any downstream tasks. After
pre-training, the resulting model can be utilized later, through a fine-tuning
procedure, to perform tasks using limited additional training. Used often in
Natural Language Processing (NLP) and lately in vision tasks, BERT
(Bidirectional Encoder Representations from Transformer), a form of a
Transformer model, provides an optimal platform for this framework. The
attention mechanism of BERT, applied here on a sequence of traces within the
shot gather, is able to capture and store key geometrical features of the
seismic data. We pre-train StorSeismic on field data, along with synthetically
generated ones, in the self-supervised step. Then, we use the labeled synthetic
data to fine-tune the pre-trained network in a supervised fashion to perform
various seismic processing tasks, like denoising, velocity estimation, first
arrival picking, and NMO. Finally, the fine-tuned model is used to obtain
satisfactory inference results on the field data.
|
[{'version': 'v1', 'created': 'Sat, 30 Apr 2022 09:55:00 GMT'}]
|
2022-12-07
|
[array(['Harsuko', 'Randy', ''], dtype=object)
array(['Alkhalifah', 'Tariq', ''], dtype=object)]
|
3,602 |
2205.07728
|
Albert Wu
|
Albert Wu, Thomas Lew, Kiril Solovey, Edward Schmerling, Marco Pavone
|
Robust-RRT: Probabilistically-Complete Motion Planning for Uncertain
Nonlinear Systems
|
16 pages of main text + 5 pages of appendix, 5 figures, submitted to
the 2022 International Symposium on Robotics Research
| null | null | null |
cs.RO
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
Robust motion planning entails computing a global motion plan that is safe
under all possible uncertainty realizations, be it in the system dynamics, the
robot's initial position, or with respect to external disturbances. Current
approaches for robust motion planning either lack theoretical guarantees, or
make restrictive assumptions on the system dynamics and uncertainty
distributions. In this paper, we address these limitations by proposing the
robust rapidly-exploring random-tree (Robust-RRT) algorithm, which integrates
forward reachability analysis directly into sampling-based control trajectory
synthesis. We prove that Robust-RRT is probabilistically complete (PC) for
nonlinear Lipschitz continuous dynamical systems with bounded uncertainty. In
other words, Robust-RRT eventually finds a robust motion plan that is feasible
under all possible uncertainty realizations assuming such a plan exists. Our
analysis applies even to unstable systems that admit only short-horizon
feasible plans; this is because we explicitly consider the time evolution of
reachable sets along control trajectories. Thanks to the explicit consideration
of time dependency in our analysis, PC applies to unstabilizable systems. To
the best of our knowledge, this is the most general PC proof for robust
sampling-based motion planning, in terms of the types of uncertainties and
dynamical systems it can handle. Considering that an exact computation of
reachable sets can be computationally expensive for some dynamical systems, we
incorporate sampling-based reachability analysis into Robust-RRT and
demonstrate our robust planner on nonlinear, underactuated, and hybrid systems.
|
[{'version': 'v1', 'created': 'Mon, 16 May 2022 14:46:12 GMT'}
{'version': 'v2', 'created': 'Tue, 1 Nov 2022 15:22:55 GMT'}]
|
2022-11-02
|
[array(['Wu', 'Albert', ''], dtype=object)
array(['Lew', 'Thomas', ''], dtype=object)
array(['Solovey', 'Kiril', ''], dtype=object)
array(['Schmerling', 'Edward', ''], dtype=object)
array(['Pavone', 'Marco', ''], dtype=object)]
|
3,603 |
physics/0612034
|
Dmitrii Makarov
|
Serdal Kirmizialtin and Dmitrii E. Makarov
|
Untying molecular friction knots
| null | null | null | null |
physics.bio-ph cond-mat.soft physics.chem-ph
| null |
Motivated by recent advances in single molecule manipulation techniques that
enabled several groups to tie knots in individual polymer strands and to
monitor their dynamics, we have used computer simulations to study "friction
knots" joining a pair of polymer strands. The key property of a friction knot
splicing two ropes is that it becomes jammed when the ropes are pulled apart.
In contrast, molecular friction knots eventually become undone by thermal
motion. We show that depending on the knot type and on the polymer structure, a
friction knot between polymer strands can be strong (the time t the knot stays
tied increases with the force F applied to separate the strands) or weak (t
decreases with increasing F). We further present a simple model explaining
these behaviors.
|
[{'version': 'v1', 'created': 'Tue, 5 Dec 2006 00:10:20 GMT'}]
|
2007-05-23
|
[array(['Kirmizialtin', 'Serdal', ''], dtype=object)
array(['Makarov', 'Dmitrii E.', ''], dtype=object)]
|
3,604 |
1307.0010
|
Chris Nixon
|
Chris Nixon, Andrew King and Daniel Price
|
Tearing up the disc: misaligned accretion on to a binary
|
9 pages, 7 figures. Accepted to MNRAS. Simulation movies are
available here: http://jila.colorado.edu/chrisnixon/tearing_binary.html
| null |
10.1093/mnras/stt1136
| null |
astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In a recent paper we have shown that the evolution of a misaligned disc
around a spinning black hole can result in tearing the disc into many distinct
planes. Tearing discs with random orientations produce direct dynamical
accretion on to the hole in approximately 70% of all cases. Here we examine the
evolution of a misaligned disc around a binary system. We show that these discs
are susceptible to tearing for almost all inclinations. We also show that
tearing of the disc can result in a significant acceleration of the disc
evolution and subsequent accretion on to the binary - by factors up to 10,000
times that of a coplanar prograde disc with otherwise identical parameters.
This provides a promising mechanism for driving mergers of supermassive black
hole (SMBH) binaries on timescales much shorter than a Hubble time. Disc
tearing also suggests new observational signatures of accreting SMBH binaries,
and other systems such as protostellar binaries.
|
[{'version': 'v1', 'created': 'Fri, 28 Jun 2013 20:00:04 GMT'}]
|
2019-08-19
|
[array(['Nixon', 'Chris', ''], dtype=object)
array(['King', 'Andrew', ''], dtype=object)
array(['Price', 'Daniel', ''], dtype=object)]
|
3,605 |
hep-th/9909049
|
Emil J. Martinec
|
Emil J. Martinec
|
Black holes and the phases of brane thermodynamics
|
29 pages, 12 figures; lectures at Cargese 1999
| null | null |
EFI-99-38
|
hep-th
| null |
Introductory lectures on the relations between the thermodynamics of gauge
theory on branes and black holes, including the correspondence principle of
Horowitz and Polchinski, the AdS/CFT conjecture, and matrix theory.
|
[{'version': 'v1', 'created': 'Wed, 8 Sep 1999 21:42:09 GMT'}]
|
2007-05-23
|
[array(['Martinec', 'Emil J.', ''], dtype=object)]
|
3,606 |
1809.07066
|
Vishal Sunder
|
Vishal Sunder, Lovekesh Vig, Arnab Chatterjee, Gautam Shroff
|
Prosocial or Selfish? Agents with different behaviors for Contract
Negotiation using Reinforcement Learning
|
Proceedings of the 11th International Workshop on Automated
Negotiations (held in conjunction with IJCAI 2018)
| null | null | null |
cs.LG cs.AI cs.MA stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present an effective technique for training deep learning agents capable
of negotiating on a set of clauses in a contract agreement using a simple
communication protocol. We use Multi Agent Reinforcement Learning to train both
agents simultaneously as they negotiate with each other in the training
environment. We also model selfish and prosocial behavior to varying degrees in
these agents. Empirical evidence is provided showing consistency in agent
behaviors. We further train a meta agent with a mixture of behaviors by
learning an ensemble of different models using reinforcement learning. Finally,
to ascertain the deployability of the negotiating agents, we conducted
experiments pitting the trained agents against human players. Results
demonstrate that the agents are able to hold their own against human players,
often emerging as winners in the negotiation. Our experiments demonstrate that
the meta agent is able to reasonably emulate human behavior.
|
[{'version': 'v1', 'created': 'Wed, 19 Sep 2018 08:46:34 GMT'}]
|
2018-09-20
|
[array(['Sunder', 'Vishal', ''], dtype=object)
array(['Vig', 'Lovekesh', ''], dtype=object)
array(['Chatterjee', 'Arnab', ''], dtype=object)
array(['Shroff', 'Gautam', ''], dtype=object)]
|
3,607 |
1908.06037
|
Nick Pawlowski
|
Nick Pawlowski, Suvrat Bhooshan, Nicolas Ballas, Francesco Ciompi, Ben
Glocker, Michal Drozdzal
|
Needles in Haystacks: On Classifying Tiny Objects in Large Images
| null | null | null | null |
cs.CV cs.LG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In some important computer vision domains, such as medical or hyperspectral
imaging, we care about the classification of tiny objects in large images.
However, most Convolutional Neural Networks (CNNs) for image classification
were developed using biased datasets that contain large objects, in mostly
central image positions. To assess whether classical CNN architectures work
well for tiny object classification we build a comprehensive testbed containing
two datasets: one derived from MNIST digits and one from histopathology images.
This testbed allows controlled experiments to stress-test CNN architectures
with a broad spectrum of signal-to-noise ratios. Our observations indicate
that: (1) There exists a limit to signal-to-noise below which CNNs fail to
generalize and that this limit is affected by dataset size - more data leading
to better performances; however, the amount of training data required for the
model to generalize scales rapidly with the inverse of the object-to-image
ratio (2) in general, higher capacity models exhibit better generalization; (3)
when knowing the approximate object sizes, adapting receptive field is
beneficial; and (4) for very small signal-to-noise ratio the choice of global
pooling operation affects optimization, whereas for relatively large
signal-to-noise values, all tested global pooling operations exhibit similar
performance.
|
[{'version': 'v1', 'created': 'Fri, 16 Aug 2019 15:42:55 GMT'}
{'version': 'v2', 'created': 'Mon, 6 Jan 2020 13:13:07 GMT'}]
|
2020-01-07
|
[array(['Pawlowski', 'Nick', ''], dtype=object)
array(['Bhooshan', 'Suvrat', ''], dtype=object)
array(['Ballas', 'Nicolas', ''], dtype=object)
array(['Ciompi', 'Francesco', ''], dtype=object)
array(['Glocker', 'Ben', ''], dtype=object)
array(['Drozdzal', 'Michal', ''], dtype=object)]
|
3,608 |
2206.09398
|
Alexis Thual
|
Alexis Thual, Huy Tran, Tatiana Zemskova, Nicolas Courty, R\'emi
Flamary, Stanislas Dehaene, Bertrand Thirion
|
Aligning individual brains with Fused Unbalanced Gromov-Wasserstein
| null | null | null | null |
q-bio.NC stat.ML
|
http://creativecommons.org/licenses/by/4.0/
|
Individual brains vary in both anatomy and functional organization, even
within a given species. Inter-individual variability is a major impediment when
trying to draw generalizable conclusions from neuroimaging data collected on
groups of subjects. Current co-registration procedures rely on limited data,
and thus lead to very coarse inter-subject alignments. In this work, we present
a novel method for inter-subject alignment based on Optimal Transport, denoted
as Fused Unbalanced Gromov Wasserstein (FUGW). The method aligns cortical
surfaces based on the similarity of their functional signatures in response to
a variety of stimulation settings, while penalizing large deformations of
individual topographic organization. We demonstrate that FUGW is well-suited
for whole-brain landmark-free alignment. The unbalanced feature allows to deal
with the fact that functional areas vary in size across subjects. Our results
show that FUGW alignment significantly increases between-subject correlation of
activity for independent functional data, and leads to more precise mapping at
the group level.
|
[{'version': 'v1', 'created': 'Sun, 19 Jun 2022 13:06:11 GMT'}
{'version': 'v2', 'created': 'Tue, 22 Nov 2022 16:38:23 GMT'}]
|
2022-11-23
|
[array(['Thual', 'Alexis', ''], dtype=object)
array(['Tran', 'Huy', ''], dtype=object)
array(['Zemskova', 'Tatiana', ''], dtype=object)
array(['Courty', 'Nicolas', ''], dtype=object)
array(['Flamary', 'Rémi', ''], dtype=object)
array(['Dehaene', 'Stanislas', ''], dtype=object)
array(['Thirion', 'Bertrand', ''], dtype=object)]
|
3,609 |
quant-ph/9910121
|
Gert-Ludwig Ingold
|
Gert-Ludwig Ingold, Rodolfo A. Jalabert, Klaus Richter
|
Semiclassical analysis of level widths for one-dimensional potentials
|
8 pages, 2 figures, RevTeX
|
Am. J. Phys. 69, 201-206 (2001)
|
10.1119/1.1288129
| null |
quant-ph cond-mat physics.atom-ph
| null |
We present a semiclassical study of level widths for a class of
one-dimensional potentials in the presence of an ohmic environment. Employing
an expression for the dipole matrix element in terms of the Fourier transform
of the classical path we obtain the level widths within the Golden rule
approximation. It is found that for potentials with an asymptotic power-law
behavior, which may in addition be limited by an infinite wall, the width that
an eigenstate of the isolated system acquires due to the coupling to the
environment is proportional to its quantum number.
|
[{'version': 'v1', 'created': 'Fri, 29 Oct 1999 13:43:39 GMT'}]
|
2007-05-23
|
[array(['Ingold', 'Gert-Ludwig', ''], dtype=object)
array(['Jalabert', 'Rodolfo A.', ''], dtype=object)
array(['Richter', 'Klaus', ''], dtype=object)]
|
3,610 |
cs/0507071
|
Andreas U. Schmidt
|
Nicolai Kuntze, Thomas Rauch, Andreas U. Schmidt
|
Security for Distributed Web-Applications via Aspect-Oriented
Programming
|
Refereed contribution to the Conference Information Security South
Africa (ISSA 2005) Sandton, South Africa, 29. June - 1. July 2005
| null | null | null |
cs.CR
| null |
Identity Management is becoming more and more important in business systems
as they are opened for third parties including trading partners, consumers and
suppliers. This paper presents an approach securing a system without any
knowledge of the system source code. The security module adds to the existing
system authentication and authorisation based on aspect oriented programming
and the liberty alliance framework, an upcoming industrie standard providing
single sign on. In an initial training phase the module is adapted to the
application which is to be secured. Moreover the use of hardware tokens and
proactive computing is demonstrated. The high modularisation is achived through
use of AspectJ, a programming language extension of Java.
|
[{'version': 'v1', 'created': 'Fri, 29 Jul 2005 10:44:49 GMT'}]
|
2007-05-23
|
[array(['Kuntze', 'Nicolai', ''], dtype=object)
array(['Rauch', 'Thomas', ''], dtype=object)
array(['Schmidt', 'Andreas U.', ''], dtype=object)]
|
3,611 |
2202.09365
|
Luis Gerhorst
|
Stefan Reif, Phillip Raffeck, Luis Gerhorst, Wolfgang
Schr\"oder-Preikschat, Timo H\"onig
|
Migration-Based Synchronization
| null |
SBESC'21: Proceedings of the XI Brazilian Symposium on Computing
Systems Engineering. 2021. IEEE, Pages 1-8
|
10.1109/SBESC53686.2021.9628358
| null |
cs.OS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A fundamental challenge in multi- and many-core systems is the correct
execution of concurrent access to shared data. A common drawback from existing
synchronization mechanisms is the loss of data locality as the shared data is
transferred between the accessing cores. In real-time systems, this is
especially important as knowledge about data access times is crucial to
establish bounds on execution times and guarantee the meeting of deadlines.We
propose in this paper a refinement of our previously sketched approach of
Migration-Based Synchronization (MBS) as well as its first practical
implementation. The core concept of MBS is the replacement of data migration
with control-flow migration to achieve synchronized memory accesses with
guaranteed data locality. This leads to both shorter and more predictable
execution times for critical sections. As MBS can be used as a substitute for
classical locks, it can be employed in legacy applications without code
alterations.We further examine how the gained data locality improves the
results of worst-case timing analyses and results in tighter bounds on
execution and response time. We reason about the similarity of MBS to existing
synchronization approaches and how it enables us to reuse existing analysis
techniques.Finally, we evaluate our prototype implementation, showing that MBS
can exploit data locality with similar overheads as traditional locking
mechanisms.
|
[{'version': 'v1', 'created': 'Fri, 18 Feb 2022 12:50:30 GMT'}]
|
2022-02-22
|
[array(['Reif', 'Stefan', ''], dtype=object)
array(['Raffeck', 'Phillip', ''], dtype=object)
array(['Gerhorst', 'Luis', ''], dtype=object)
array(['Schröder-Preikschat', 'Wolfgang', ''], dtype=object)
array(['Hönig', 'Timo', ''], dtype=object)]
|
3,612 |
2007.15950
|
Rainer Sch\"odel
|
R. Sch\"odel, F. Nogueras-Lara, E. Gallego-Cano, B. Shahzamanian, A.
T. Gallego-Calvente, A. Gardini
|
The Milky Way's nuclear star cluster: Old, metal-rich, and cuspy
|
Accepted for publication by A&A
|
A&A 641, A102 (2020)
|
10.1051/0004-6361/201936688
| null |
astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
(abridged) We provide Ks photometry for roughly 39,000 stars and H-band
photometry for about 11,000 stars within a field of about 40"x40", centred on
Sgr A*. In addition, we provide Ks photometry of about 3,000 stars in a very
deep central field of 10"x10", centred on Sgr A*. We find that the Ks
luminosity function (KLF) is rather homogeneous within the studied field and
does not show any significant changes as a function of distance from the
central black hole on scales of a few 0.1 pc. By fitting theoretical luminosity
functions to the KLF, we derive the star formation history of the nuclear star
cluster. We find that about 80% of the original star formation took place 10
Gyr ago or longer, followed by a largely quiescent phase that lasted for more
than 5 Gyr. We clearly detect the presence of intermediate-age stars of about 3
Gyr in age. This event makes up about 15% of the originally formed stellar mass
of the cluster. A few percent of the stellar mass formed in the past few 100
Myr. Our results appear to be inconsistent with a quasi-continuous star
formation history. The stellar density increases exponentially towards Sgr A*
at all magnitudes between Ks=15 to 19. We also show that the precise properties
of the stellar cusp around Sgr A* are hard to determine because the star
formation history suggests that the star counts can be significantly
contaminated, at all magnitudes, by stars that are too young to be dynamically
relaxed. We find that the probability of observing any young (non-millisecond)
pulsar in a tight orbit around Sgr A* and beamed towards Earth is very low. We
argue that typical globular clusters, such as they are observed in and around
the Milky Way today, have probably not contributed to the nuclear cluster's
mass in any significant way. The nuclear cluster may have formed following
major merger events in the early history of the Milky Way.
|
[{'version': 'v1', 'created': 'Fri, 31 Jul 2020 10:32:29 GMT'}]
|
2020-09-16
|
[array(['Schödel', 'R.', ''], dtype=object)
array(['Nogueras-Lara', 'F.', ''], dtype=object)
array(['Gallego-Cano', 'E.', ''], dtype=object)
array(['Shahzamanian', 'B.', ''], dtype=object)
array(['Gallego-Calvente', 'A. T.', ''], dtype=object)
array(['Gardini', 'A.', ''], dtype=object)]
|
3,613 |
1907.12720
|
Luke Oakden-Rayner
|
Luke Oakden-Rayner
|
Exploring large scale public medical image datasets
|
9 pages, 5 tables
| null | null | null |
eess.IV cs.CV cs.LG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Rationale and Objectives: Medical artificial intelligence systems are
dependent on well characterised large scale datasets. Recently released public
datasets have been of great interest to the field, but pose specific challenges
due to the disconnect they cause between data generation and data usage,
potentially limiting the utility of these datasets.
Materials and Methods: We visually explore two large public datasets, to
determine how accurate the provided labels are and whether other subtle
problems exist. The ChestXray14 dataset contains 112,120 frontal chest films,
and the MURA dataset contains 40,561 upper limb radiographs. A subset of around
700 images from both datasets was reviewed by a board-certified radiologist,
and the quality of the original labels was determined.
Results: The ChestXray14 labels did not accurately reflect the visual content
of the images, with positive predictive values mostly between 10% and 30% lower
than the values presented in the original documentation. There were other
significant problems, with examples of hidden stratification and label
disambiguation failure. The MURA labels were more accurate, but the original
normal/abnormal labels were inaccurate for the subset of cases with
degenerative joint disease, with a sensitivity of 60% and a specificity of 82%.
Conclusion: Visual inspection of images is a necessary component of
understanding large image datasets. We recommend that teams producing public
datasets should perform this important quality control procedure and include a
thorough description of their findings, along with an explanation of the data
generating procedures and labelling rules, in the documentation for their
datasets.
|
[{'version': 'v1', 'created': 'Tue, 30 Jul 2019 03:09:27 GMT'}]
|
2019-07-31
|
[array(['Oakden-Rayner', 'Luke', ''], dtype=object)]
|
3,614 |
0904.0183
|
Gene Abrams
|
Gene Abrams and Kulumani M. Rangaswamy
|
Row-finite equivalents exist only for row-countable graphs
|
Replaces version from April 2009; current version contains
streamlined arguments, and additional examples
| null | null | null |
math.RA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
If $E$ is a not-necessarily row-finite graph, such that each vertex of $E$
emits at most countably many edges, then a {\it desingularization} $F$ of $E$
can be constructed (see e.g. (1) G. Abrams, G. Aranda Pino, Leavitt path
algebras of arbitrary graphs, Houston J. Math 34(2) (2008), 423-442, or (2) I.
Raeburn, "Graph algebras". CBMS Regional Conference Series in Mathematics 103,
Conference Board of the Mathematical Sciences, Washington, DC, 2005, ISBN
0-8218-3660-9). The desingularization process has been effectively used to
establish various characteristics of the Leavitt path algebras of
not-necessarily row-finite graphs. Such a desingularization $F$ of $E$ has the
properties that: (1) $F$ is row-finite, and (2) the Leavitt path algebras
$L(E)$ and $L(F)$ are Morita equivalent. We show here that for an arbitrary
graph $E$, a graph $F$ having properties (1) and (2) exists (we call such a
graph $F$ a \emph{row-finite equivalent of} $E$) if and only if $E$ is
row-countable; that is, $E$ contains no vertex $v$ for which $v$ emits
uncountably many edges.
|
[{'version': 'v1', 'created': 'Wed, 1 Apr 2009 15:30:05 GMT'}
{'version': 'v2', 'created': 'Tue, 4 Jan 2011 14:36:05 GMT'}]
|
2011-01-05
|
[array(['Abrams', 'Gene', ''], dtype=object)
array(['Rangaswamy', 'Kulumani M.', ''], dtype=object)]
|
3,615 |
1705.01204
|
Marianna Pensky
|
Marianna Pensky and Teng Zhang
|
Spectral clustering in the dynamic stochastic block model
| null | null | null | null |
stat.ME stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the present paper, we studied a Dynamic Stochastic Block Model (DSBM)
under the assumptions that the connection probabilities, as functions of time,
are smooth and that at most $s$ nodes can switch their class memberships
between two consecutive time points. We estimate the edge probability tensor by
a kernel-type procedure and extract the group memberships of the nodes by
spectral clustering. The procedure is computationally viable, adaptive to the
unknown smoothness of the functional connection probabilities, to the rate $s$
of membership switching and to the unknown number of clusters. In addition, it
is accompanied by non-asymptotic guarantees for the precision of estimation and
clustering.
|
[{'version': 'v1', 'created': 'Tue, 2 May 2017 23:55:26 GMT'}]
|
2017-05-04
|
[array(['Pensky', 'Marianna', ''], dtype=object)
array(['Zhang', 'Teng', ''], dtype=object)]
|
3,616 |
cond-mat/9710030
|
Walter Nadler
|
Ugo Bastolla(1), Helge Frauenkron (1), Erwin Gerstner (1,2), Peter
Grassberger(1,2), Walter Nadler (1) ((1) HLRZ c/o Forschungszentrum J\"ulich,
Germany; (2) Physics Department, University of Wuppertal,Germany)
|
Testing a new Monte Carlo Algorithm for Protein Folding
|
13 pages, RevTeX, needs epsfig.sty and multicolum.sty
|
Proteins: Structure, Function, and Genetics Vol. 32 (1998) 52--66
| null | null |
cond-mat.stat-mech q-bio
| null |
We demonstrate that the recently proposed pruned-enriched Rosenbluth method
PERM (P. Grassberger, Phys. Rev. E, in press (1997)) leads to extremely
efficient algorithms for the folding of simple model proteins. We test it on
several models for lattice heteropolymers, and compare to published Monte Carlo
studies of the properties of particular sequences. In all cases our method is
faster than the previous ones, and in several cases we find new minimal energy
states.
In addition to producing more reliable candidates for ground states, our
method gives detailed information about the thermal spectrum and, thus, allows
to analyze static aspects of the folding behavior of arbitrary sequences.
|
[{'version': 'v1', 'created': 'Thu, 2 Oct 1997 17:28:48 GMT'}]
|
2007-05-23
|
[array(['Bastolla', 'Ugo', ''], dtype=object)
array(['Frauenkron', 'Helge', ''], dtype=object)
array(['Gerstner', 'Erwin', ''], dtype=object)
array(['Grassberger', 'Peter', ''], dtype=object)
array(['Nadler', 'Walter', ''], dtype=object)]
|
3,617 |
2001.02865
|
Hai-Ming Xu
|
Hai-Ming Xu, Lingqiao Liu, Dong Gong
|
Semi-supervised Learning via Conditional Rotation Angle Estimation
| null | null | null | null |
cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Self-supervised learning (SlfSL), aiming at learning feature representations
through ingeniously designed pretext tasks without human annotation, has
achieved compelling progress in the past few years. Very recently, SlfSL has
also been identified as a promising solution for semi-supervised learning
(SemSL) since it offers a new paradigm to utilize unlabeled data. This work
further explores this direction by proposing to couple SlfSL with SemSL. Our
insight is that the prediction target in SemSL can be modeled as the latent
factor in the predictor for the SlfSL target. Marginalizing over the latent
factor naturally derives a new formulation which marries the prediction targets
of these two learning processes. By implementing this idea through a
simple-but-effective SlfSL approach -- rotation angle prediction, we create a
new SemSL approach called Conditional Rotation Angle Estimation (CRAE).
Specifically, CRAE is featured by adopting a module which predicts the image
rotation angle conditioned on the candidate image class. Through experimental
evaluation, we show that CRAE achieves superior performance over the other
existing ways of combining SlfSL and SemSL. To further boost CRAE, we propose
two extensions to strengthen the coupling between SemSL target and SlfSL target
in basic CRAE. We show that this leads to an improved CRAE method which can
achieve the state-of-the-art SemSL performance.
|
[{'version': 'v1', 'created': 'Thu, 9 Jan 2020 07:06:20 GMT'}]
|
2020-01-10
|
[array(['Xu', 'Hai-Ming', ''], dtype=object)
array(['Liu', 'Lingqiao', ''], dtype=object)
array(['Gong', 'Dong', ''], dtype=object)]
|
3,618 |
2201.07189
|
Mihee Lee
|
Mihee Lee, Samuel S. Sohn, Seonghyeon Moon, Sejong Yoon, Mubbasir
Kapadia, Vladimir Pavlovic
|
MUSE-VAE: Multi-Scale VAE for Environment-Aware Long Term Trajectory
Prediction
| null | null | null | null |
cs.CV
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
Accurate long-term trajectory prediction in complex scenes, where multiple
agents (e.g., pedestrians or vehicles) interact with each other and the
environment while attempting to accomplish diverse and often unknown goals, is
a challenging stochastic forecasting problem. In this work, we propose MUSE, a
new probabilistic modeling framework based on a cascade of Conditional VAEs,
which tackles the long-term, uncertain trajectory prediction task using a
coarse-to-fine multi-factor forecasting architecture. In its Macro stage, the
model learns a joint pixel-space representation of two key factors, the
underlying environment and the agent movements, to predict the long and
short-term motion goals. Conditioned on them, the Micro stage learns a
fine-grained spatio-temporal representation for the prediction of individual
agent trajectories. The VAE backbones across the two stages make it possible to
naturally account for the joint uncertainty at both levels of granularity. As a
result, MUSE offers diverse and simultaneously more accurate predictions
compared to the current state-of-the-art. We demonstrate these assertions
through a comprehensive set of experiments on nuScenes and SDD benchmarks as
well as PFSD, a new synthetic dataset, which challenges the forecasting ability
of models on complex agent-environment interaction scenarios.
|
[{'version': 'v1', 'created': 'Tue, 18 Jan 2022 18:40:03 GMT'}]
|
2022-01-19
|
[array(['Lee', 'Mihee', ''], dtype=object)
array(['Sohn', 'Samuel S.', ''], dtype=object)
array(['Moon', 'Seonghyeon', ''], dtype=object)
array(['Yoon', 'Sejong', ''], dtype=object)
array(['Kapadia', 'Mubbasir', ''], dtype=object)
array(['Pavlovic', 'Vladimir', ''], dtype=object)]
|
3,619 |
1311.2047
|
Alban Urvoy
|
A. Urvoy (1), C. Carr (2), R. Ritter (1, 2), C. S. Adams (2), K. J.
Weatherill (2), and R. L\"ow (1) ((1) 5. Physikalisches Institut,
Universit\"at Stuttgart, Germany, (2) Joint Quantum Center (JQC)
Durham-Newcastle, Department of Physics, Durham University, UK)
|
Optical coherences and wavelength mismatch in ladder systems
|
7 pages, 7 figures, published version
|
J. Phys. B: At. Mol. Opt. Phys. 46 (2013) 245001
|
10.1088/0953-4075/46/24/245001
| null |
physics.atom-ph quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate experimentally and theoretically the coherent and incoherent
processes in open 3-level ladder systems in room temperature gases and identify
in which regime electromagnetically induced transparency (EIT) occurs. The
peculiarity of this work lies in the unusual situation where the wavelength of
the probe field is shorter than that of the coupling field. The nature of the
observed spectral features depends considerably on the total response of
different velocity classes, the varying Doppler shifts for bichromatic
excitation fields, on optical pumping to additional electronic states and
transit time effects. All these ingredients can be absorbed in a model based on
optical Bloch equations with only five electronic states.
|
[{'version': 'v1', 'created': 'Fri, 8 Nov 2013 19:45:19 GMT'}
{'version': 'v2', 'created': 'Thu, 28 Nov 2013 10:07:14 GMT'}]
|
2013-12-02
|
[array(['Urvoy', 'A.', ''], dtype=object)
array(['Carr', 'C.', ''], dtype=object)
array(['Ritter', 'R.', ''], dtype=object)
array(['Adams', 'C. S.', ''], dtype=object)
array(['Weatherill', 'K. J.', ''], dtype=object)
array(['Löw', 'R.', ''], dtype=object)]
|
3,620 |
1912.04336
|
Damien Hutsemekers
|
D. Hutsem\'ekers, D. Sluse, P. Kumar
|
Spatially separated continuum sources revealed by microlensing in the
gravitationally lensed broad absorption line quasar SDSSJ081830.46+060138.0
|
Accepted for publication in Astronomy and Astrophysics
|
A&A 633, A101 (2020)
|
10.1051/0004-6361/201936973
| null |
astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Gravitational microlensing is a powerful tool for probing the inner structure
of distant quasars. In this context, we have obtained spectropolarimetric
observations of the two images of the broad absorption line (BAL) quasar
SDSSJ081830.46+060138.0 (J0818+0601) at redshift $z \simeq$ 2.35. We first show
that J0818+0601 is actually gravitationally lensed, and not a binary quasar. A
strong absorption system detected at $z$ = 1.0065$\pm$0.0002 is possibly due to
the lensing galaxy. Microlensing is observed in one image and it magnifies the
emission lines, the continuum, and the BALs differently. By disentangling the
part of the spectrum that is microlensed from the part that is not microlensed,
we unveil two sources of continuum that must be spatially separated: a compact
one, which is microlensed, and an extended one, which is not microlensed and
contributes to two thirds of the total continuum emission. J0818+0601 is the
second BAL quasar in which an extended source of rest-frame ultraviolet
continuum is found. We also find that the images are differently polarized,
suggesting that the two continua might be differently polarized. Our analysis
provides constraints on the BAL flow. In particular, we find that the outflow
is seen with a nonzero onset velocity, and stratified according to ionization.
|
[{'version': 'v1', 'created': 'Mon, 9 Dec 2019 19:31:51 GMT'}]
|
2020-01-22
|
[array(['Hutsemékers', 'D.', ''], dtype=object)
array(['Sluse', 'D.', ''], dtype=object)
array(['Kumar', 'P.', ''], dtype=object)]
|
3,621 |
astro-ph/0509266
|
Bryan Johnson
|
Bryan M. Johnson and Charles F. Gammie
|
Nonlinear Stability of Thin, Radially-Stratified Disks
|
31 pages, 15 figures, accepted for publication in the Astrophysical
Journal
|
Astrophys.J.636:63-74,2005
|
10.1086/497982
| null |
astro-ph
| null |
We perform local numerical experiments to investigate the nonlinear stability
of thin, radially-stratified disks. We demonstrate the presence of radial
convective instability when the disk is nearly in uniform rotation, and show
that the net angular momentum transport is slightly inwards, consistent with
previous investigations of vertical convection. We then show that a
convectively-unstable equilibrium is stabilized by differential rotation.
Convective instability is determined by the Richardson number Ri =
N_r^2/(q\Omega)^2, where N_r is the radial Brunt-Vaisala frequency and q\Omega
is the shear rate. Classical convective instability in a nonshearing medium (Ri
-> -infinity) is suppressed when Ri > -1, i.e. when the shear rate becomes
greater than the growth rate. Disks with a nearly-Keplerian rotation profile
and radial gradients on the order of the disk radius have Ri > -0.01 and are
therefore stable to local nonaxisymmetric disturbances. One implication of our
results is that the ``baroclinic'' instability recently claimed by Klahr &
Bodenheimer is either global or nonexistent. We estimate that our simulations
would detect any genuine growth rate > 0.0025\Omega.
|
[{'version': 'v1', 'created': 'Fri, 9 Sep 2005 20:43:16 GMT'}]
|
2009-11-13
|
[array(['Johnson', 'Bryan M.', ''], dtype=object)
array(['Gammie', 'Charles F.', ''], dtype=object)]
|
3,622 |
2011.05079
|
Christopher Caulcrick
|
Christopher Caulcrick, Weiguang Huo, Enrico Franco, Samer Mohammed,
Will Hoult, Ravi Vaidyanathan
|
Model Predictive Control for Human-Centred Lower Limb Robotic Assistance
|
12 pages, 12 figures
| null | null | null |
cs.RO cs.SY eess.SY
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Loss of mobility or balance resulting from neural trauma is a critical
consideration in public health. Robotic exoskeletons hold great potential for
rehabilitation and assisted movement, yet optimal assist-as-needed (AAN)
control remains unresolved given pathological variance among patients. We
introduce a model predictive control (MPC) architecture for lower limb
exoskeletons centred around a fuzzy logic algorithm (FLA) identifying modes of
assistance based on human involvement. Assistance modes are: 1) passive for
human relaxed and robot dominant, 2) active-assist for human cooperation with
the task, and 3) safety in the case of human resistance to the robot. Human
torque is estimated from electromyography (EMG) signals prior to joint motions,
enabling advanced prediction of torque by the MPC and selection of assistance
mode by the FLA. The controller is demonstrated in hardware with three subjects
on a 1-DOF knee exoskeleton tracking a sinusoidal trajectory with human relaxed
assistive, and resistive. Experimental results show quick and appropriate
transfers among the assistance modes and satisfied assistive performance in
each mode. Results illustrate an objective approach to lower limb robotic
assistance through on-the-fly transition between modes of movement, providing a
new level of human-robot synergy for mobility assist and rehabilitation.
|
[{'version': 'v1', 'created': 'Tue, 10 Nov 2020 13:05:41 GMT'}]
|
2020-11-11
|
[array(['Caulcrick', 'Christopher', ''], dtype=object)
array(['Huo', 'Weiguang', ''], dtype=object)
array(['Franco', 'Enrico', ''], dtype=object)
array(['Mohammed', 'Samer', ''], dtype=object)
array(['Hoult', 'Will', ''], dtype=object)
array(['Vaidyanathan', 'Ravi', ''], dtype=object)]
|
3,623 |
1001.2519
|
Gilberto Medeiros Kremer
|
Gilberto M. Kremer
|
Entropy, entropy flux and entropy supply rate of granular fluids
|
9 pages. New version.
|
Physica A:389(2010)4018-4025
|
10.1016/j.physa.2010.06.004
| null |
cond-mat.stat-mech
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The aim of this work is to analyze the entropy, entropy flux and entropy
supply rate of granular fluids within the frameworks of the Boltzmann equation
and continuum thermodynamics. It is shown that the entropy inequality for a
granular gas that follows from the Boltzmann equation differs from the one of a
simple fluid due to the presence of a term which can be identified as the rate
of entropy supply density. From the knowledge of a non-equilibrium distribution
function -- valid for for processes closed to equilibrium and quasi-elastic
restitution coefficients -- it is obtained that the rate of entropy supply
density is equal to the rate of internal energy production density divided by
the temperature and the entropy flux is equal to the heat flux vector divided
by the temperature. A thermodynamic theory of a granular fluid is also
developed whose objective is the determination of the basic fields of mass
density, momentum density and internal energy density. The constitutive laws
are restricted by the principle of material frame indifference and by the
entropy principle. Through the exploitation of the entropy principle with
Lagrange multipliers, it is shown that the results obtained from the kinetic
theory for granular gases concerning the rate of entropy supply density and
entropy flux are valid in general for processes close to equilibrium of
granular fluids, where linearized constitutive equations hold.
|
[{'version': 'v1', 'created': 'Thu, 14 Jan 2010 18:08:27 GMT'}
{'version': 'v2', 'created': 'Mon, 5 Apr 2010 20:31:38 GMT'}]
|
2010-11-17
|
[array(['Kremer', 'Gilberto M.', ''], dtype=object)]
|
3,624 |
1412.7789
|
Roshan Ragel
|
Vajira Thambawita, Roshan Ragel and Dhammika Elkaduwe
|
To Use or Not to Use: Graphics Processing Units for Pattern Matching
Algorithms
|
appears in The 7th International Conference on Information and
Automation for Sustainability (ICIAfS) 2014
| null | null | null |
cs.DC cs.PF
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
String matching is an important part in today's computer applications and
Aho-Corasick algorithm is one of the main string matching algorithms used to
accomplish this. This paper discusses that when can the GPUs be used for string
matching applications using the Aho-Corasick algorithm as a benchmark. We have
to identify the best unit to run our string matching algorithm according to the
performance of our devices and the applications. Sometimes CPU gives better
performance than GPU and sometimes GPU gives better performance than CPU.
Therefore, identifying this critical point is significant task for researchers
who are using GPUs to improve the performance of their string matching
applications based on string matching algorithms.
|
[{'version': 'v1', 'created': 'Thu, 25 Dec 2014 05:27:49 GMT'}]
|
2014-12-30
|
[array(['Thambawita', 'Vajira', ''], dtype=object)
array(['Ragel', 'Roshan', ''], dtype=object)
array(['Elkaduwe', 'Dhammika', ''], dtype=object)]
|
3,625 |
1205.6492
|
Xu Huang
|
Xu Huang (1), G\'asp\'ar \'A. Bakos (1,2), Joel D. Hartman (1) ((1)
Department of Astrophysical Sciences, Princeton University, (2) Alfred P.
Sloan Research Fellow)
|
150 New transiting planet candidates from Kepler Q1-Q6 data
|
Accepted 2012 November 21. Received 2012 November 19; in original
form 2012 May 25.On-line data and more information can be found at
https://sites.google.com/site/largepunkelephant/
| null |
10.1093/mnras/sts463
| null |
astro-ph.EP astro-ph.IM astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We have performed an extensive search for planet candidates in the publicly
available Kepler Long Cadence data from quarters Q1 through Q6. The search
method consists of initial de-trending of the data, applying the trend
filtering algorithm, searching for transit signals with the Box Least Squares
fitting method in three frequency domains, visual inspection of the potential
transit candidates, and in-depth analysis of the shortlisted candidates. In
this paper we present 150 new periodic planet candidates and 7 single transit
events, 72 of which are in multiple systems. The periods of these planet
candidates vary from $\sim$0.17\,day to $\sim$ 440\,day. 124 of the planet
candidates have radii smaller than 3 \rearth. We recover 82.5% of the Batalha
et al. (2012) KOI catalog. We also report 40 newly identified false
positives---systems that look like transiting planets, but are probably due to
blended eclipsing binaries. Our search improves the statistics in the short
period and small planet radii parameter ranges.
|
[{'version': 'v1', 'created': 'Tue, 29 May 2012 20:56:18 GMT'}
{'version': 'v2', 'created': 'Tue, 23 Oct 2012 20:15:16 GMT'}
{'version': 'v3', 'created': 'Tue, 27 Nov 2012 07:38:25 GMT'}]
|
2012-11-28
|
[array(['Huang', 'Xu', ''], dtype=object)
array(['Bakos', 'Gáspár Á.', ''], dtype=object)
array(['Hartman', 'Joel D.', ''], dtype=object)]
|
3,626 |
1709.05017
|
Kecheng Zhang
|
Mugen Peng and Kecheng Zhang
|
Recent Advances in Fog Radio Access Networks: Performance Analysis and
Radio Resource Allocation
| null | null | null | null |
cs.IT math.IT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
As a promising paradigm for the fifth generation wireless communication (5G)
system, the fog radio access network (F-RAN) has been proposed as an advanced
socially-aware mobile networking architecture to provide high spectral
efficiency (SE) while maintaining high energy efficiency (EE) and low latency.
Recent advents are advocated to the performance analysis and radio resource
allocation, both of which are fundamental issues to make F-RANs successfully
rollout. This article comprehensively summarizes the recent advances of the
performance analysis and radio resource allocation in F-RANs. Particularly, the
advanced edge cache and adaptive model selection schemes are presented to
improve SE and EE under maintaining a low latency level. The radio resource
allocation strategies to optimize SE and EE in F-RANs are respectively
proposed. A few open issues in terms of the F-RAN based 5G architecture and the
social-awareness technique are identified as well.
|
[{'version': 'v1', 'created': 'Fri, 15 Sep 2017 00:33:47 GMT'}]
|
2017-09-18
|
[array(['Peng', 'Mugen', ''], dtype=object)
array(['Zhang', 'Kecheng', ''], dtype=object)]
|
3,627 |
1008.2957
|
Michael Shull
|
Michael Shull, Kevin France, Charles Danforth, Britton Smith, Jason
Tumlinson
|
Hubble/COS Observations of the Quasar HE 2347-4342: Probing the Epoch of
He II Patchy Reionization at Redshifts z = 2.4-2.9
|
18 pages, 8 figures (ApJ, in press) - High-resn paper available at
http://casa.colorado.edu/~mshull/HeII-paper.pdf
| null | null |
Report02
|
astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report ultraviolet spectra of the high-redshift (z_em = 2.9) quasar, HE
2347-4342, taken by the Cosmic Origins Spectrograph (COS) on the Hubble Space
Telescope (HST). Spectra in the G130M (medium-resolution, 1135-1440 A) and
G140L (low-resolution, 1030-2000 A) gratings exhibit patchy Gunn-Peterson
absorption in the 303.78 A (Ly-alpha) line of He II between z = 2.39-2.87
(G140L) and z = 2.74-2.90 (G130M). With COS, we obtain better spectral
resolution, higher-S/N, and better determined backgrounds than previous
studies, with sensitivity to abundance fractions x_HeII = 0.01 in filaments of
the cosmic web. The He II optical depths from COS are higher than those with
the Far Ultraviolet Spectroscopic Explorer (FUSE) and range from tau_HeII <
0.02 to tau_HeII > 5, with a slow recovery in mean optical depth, tau < 2 at z
< 2.7. The He II/H I optical-depth ratio varies (eta = 10-100 for 2.4 < z <
2.73 and eta = 5-500 for 2.75 < z < 2.89) on scales Delta z < 0.01 (10.8 Mpc in
comoving radial distance at z = 2.8), with numerous flux-transmission windows
between 1135-1186 A. The He II absorption extends to 1186.26 A (z = 2.905),
including associated absorbers with z_abs ~ z_QSO and minimal "proximity
effect" of flux transmission at the He II edge. We propose a QSO systemic
redshift z_QSO = 2.904 +/- 0.002, some Delta z = 0.019 higher than that derived
from O I (1302 A) emission. Three long troughs (4-10 A or 25-60 Mpc comoving
distance) of strong He II absorption between z = 2.75-2.90 are uncharacteristic
of the intergalactic medium if He II reionized at z_r ~ 3. Contrary to recent
indirect estimates (z_r = 3.2 +/- 0.2) from H I optical depths, the epoch of
HeII reionization may extend to z ~ 2.7.
|
[{'version': 'v1', 'created': 'Tue, 17 Aug 2010 20:00:01 GMT'}]
|
2010-08-19
|
[array(['Shull', 'Michael', ''], dtype=object)
array(['France', 'Kevin', ''], dtype=object)
array(['Danforth', 'Charles', ''], dtype=object)
array(['Smith', 'Britton', ''], dtype=object)
array(['Tumlinson', 'Jason', ''], dtype=object)]
|
3,628 |
2205.08937
|
Shengbing Deng
|
Shengbing Deng and Xingliang Tian
|
Some weighted fourth-order Hardy-Henon equations
| null |
Journal of Functional Analysis,284(2023)109745
| null | null |
math.AP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
By using a suitable transform related to Sobolev inequality, we investigate
the sharp constants and optimizers in radial space for the following weighted
Caffarelli-Kohn-Nirenberg-type inequalities: \begin{equation*}
\int_{\mathbb{R}^N}|x|^{\alpha}|\Delta u|^2 dx \geq
S^{rad}(N,\alpha)\left(\int_{\mathbb{R}^N}|x|^{-\alpha}|u|^{p^*_{\alpha}}
dx\right)^{\frac{2}{p^*_{\alpha}}}, \quad u\in C^\infty_c(\mathbb{R}^N),
\end{equation*} where $N\geq 3$, $4-N<\alpha<2$,
$p^*_{\alpha}=\frac{2(N-\alpha)}{N-4+\alpha}$. Then we obtain the explicit form
of the unique (up to scaling) radial positive solution $U_{\lambda,\alpha}$ to
the weighted fourth-order Hardy (for $\alpha>0$) or H\'{e}non (for $\alpha<0$)
equation: \begin{equation*}
\Delta(|x|^{\alpha}\Delta u)=|x|^{-\alpha} u^{p^*_{\alpha}-1},\quad u>0 \quad
\mbox{in}\quad \mathbb{R}^N.
\end{equation*} %Furthermore, we characterize all the solutions to the
linearized problem related to above equation at $U_{1,\alpha}$. For $\alpha\neq
0$, it is known the solutions of above equation are invariant for dilations
$\lambda^{\frac{N-4+\alpha}{2}}u(\lambda x)$ but not for translations. However
we show that if $\alpha$ is an even integer, there exist new solutions to the
linearized problem, which related to above equation at $U_{1,\alpha}$, that
"replace" the ones due to the translations invariance. This interesting
phenomenon was first shown by Gladiali, Grossi and Neves [Adv. Math. 249, 2013,
1-36] for the second-order H\'{e}non problem. Finally, as applications, we
investigate the reminder term of above inequality and also the existence of
solutions to some related perturbed equations.
|
[{'version': 'v1', 'created': 'Wed, 18 May 2022 14:02:40 GMT'}
{'version': 'v2', 'created': 'Wed, 2 Nov 2022 16:15:01 GMT'}]
|
2022-11-03
|
[array(['Deng', 'Shengbing', ''], dtype=object)
array(['Tian', 'Xingliang', ''], dtype=object)]
|
3,629 |
math/9803167
|
Shelah Office
|
Zolt\'an Balogh, Sheldon W. Davis, Winfried Just, Saharon Shelah, Paul
J. Szeptycki
|
Strongly almost disjoint sets and weakly uniform bases
| null | null | null |
Shelah [BDJSSh:674]
|
math.LO math.GN
| null |
A combinatorial principle CECA is formulated and its equivalence with GCH+
certain weakenings of Box_lambda for singular lambda is proved. CECA is used to
show that certain ``almost point- < tau'' families can be refined to point- <
tau families by removing a small set from each member of the family. This
theorem in turn is used to show the consistency of ``every first countable
T_1-space with a weakly uniform base has a point-countable base.''
|
[{'version': 'v1', 'created': 'Sun, 15 Mar 1998 00:00:00 GMT'}]
|
2016-09-07
|
[array(['Balogh', 'Zoltán', ''], dtype=object)
array(['Davis', 'Sheldon W.', ''], dtype=object)
array(['Just', 'Winfried', ''], dtype=object)
array(['Shelah', 'Saharon', ''], dtype=object)
array(['Szeptycki', 'Paul J.', ''], dtype=object)]
|
3,630 |
2108.06084
|
Conglong Li
|
Conglong Li, Minjia Zhang, Yuxiong He
|
The Stability-Efficiency Dilemma: Investigating Sequence Length Warmup
for Training GPT Models
|
Published in NeurIPS 2022. This paper was previously titled
"Curriculum Learning: A Regularization Method for Efficient and Stable
Billion-Scale GPT Model Pre-Training" in early arxiv preprint versions
| null | null | null |
cs.LG cs.DC
|
http://creativecommons.org/licenses/by/4.0/
|
Recent works have demonstrated great success in pre-training large-scale
autoregressive language models on massive GPUs. To reduce the wall-clock
training time, a common practice is to increase the batch size and learning
rate. However, such practice is often brittle and leads to a so-called
stability-efficiency dilemma: increasing the batch sizes and learning rates
leads to better training efficiency but can also result in training
instability, leading to poor generalization accuracy or failed runs. To better
understand this phenomenon, we conduct an in-depth analysis on large-scale
pre-training experiments replicating the GPT-2 model. We find that there is a
strong correlation between training instability and extreme values of gradient
variance, and that samples with long sequence lengths contribute to these
extreme gradient variance values, especially at the beginning of the training,
indicating that long sequence length can be a main source of training
instability. Based on the analysis, we present a Sequence Length Warmup method
that aims to solve the training stability-efficiency dilemma. Experiments
replicating GPT-2 models show that our approach enables stable training with 8x
larger batch size and 4x larger learning rate, whereas the baseline approach
struggles with training instability. To achieve the same or better zero-shot
evaluation results, our method reduces the required number of training tokens
and wall clock time by up to 2.2x and 3.7x, respectively. Experiments
replicating GPT-3 model (125M) show that our approach enables stable training
with 8x larger batch size and 40x larger learning rate, and retains 99% of the
zero-shot accuracy on 11 tasks using 10x less data and 17x less time compared
to the original GPT-3 training recipe, while the baseline diverges under the
same settings and only retain 95% of accuracy under lower learning rate.
|
[{'version': 'v1', 'created': 'Fri, 13 Aug 2021 06:32:53 GMT'}
{'version': 'v2', 'created': 'Wed, 6 Oct 2021 03:22:59 GMT'}
{'version': 'v3', 'created': 'Tue, 1 Feb 2022 05:22:37 GMT'}
{'version': 'v4', 'created': 'Sun, 16 Oct 2022 08:42:29 GMT'}]
|
2022-10-18
|
[array(['Li', 'Conglong', ''], dtype=object)
array(['Zhang', 'Minjia', ''], dtype=object)
array(['He', 'Yuxiong', ''], dtype=object)]
|
3,631 |
2010.04121
|
Robert Salzmann
|
Simon Becker, Nilanjana Datta, Robert Salzmann
|
Quantum Zeno effect for open quantum systems
|
45 pages
| null |
10.1007/s00023-021-01075-8
| null |
quant-ph math-ph math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We prove the quantum Zeno effect in open quantum systems whose evolution,
governed by quantum dynamical semigroups, is repeatedly and frequently
interrupted by the action of a quantum operation. For the case of a quantum
dynamical semigroup with a bounded generator, our analysis leads to a
refinement of existing results and extends them to a larger class of quantum
operations. We also prove the existence of a novel strong quantum Zeno limit
for quantum operations for which a certain spectral gap assumption, which all
previous results relied on, is lifted. The quantum operations are instead
required to satisfy a weaker property of strong power-convergence. In addition,
we establish, for the first time, the existence of a quantum Zeno limit for the
case of unbounded generators. We also provide a variety of physically
interesting examples of quantum operations to which our results apply.
|
[{'version': 'v1', 'created': 'Thu, 8 Oct 2020 17:00:05 GMT'}]
|
2021-11-03
|
[array(['Becker', 'Simon', ''], dtype=object)
array(['Datta', 'Nilanjana', ''], dtype=object)
array(['Salzmann', 'Robert', ''], dtype=object)]
|
3,632 |
0807.4631
|
Saku Tsuneta
|
S. Tsuneta, K. Ichimoto, Y. Katsukawa, B. W. Lites, K. Matsuzaki, S.
Nagata, D. Orozco Suarez, T. Shimizu, M. Shimojo, R. A. Shine, Y. Suematsu,
T. K. Suzuki, T. D. Tarbell, A. M. Title
|
Magnetic Landscape of Sun's Polar Region
|
Astrophysical Journal in press V1 and V2 are the same
| null |
10.1086/592226
| null |
astro-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the magnetic landscape of the polar region of the Sun that is
unprecedented in terms of high spatial resolution, large field of view, and
polarimetric precision. These observations were carried out with the Solar
Optical Telescope aboard \emph{Hinode}. Using a Milne-Eddington inversion, we
found many vertically-oriented magnetic flux tubes with field strength as
strong as 1 kG that are scattered in latitude between 70-90 degree. They all
have the same polarity, consistent with the global polarity of the polar
region. The field vectors were observed to diverge from the center of the flux
elements, consistent with a view of magnetic fields that expand and fan out
with height. The polar region is also covered with ubiquitous horizontal
fields. The polar regions are the source of the fast solar wind channelled
along unipolar coronal magnetic fields whose photospheric source is evidently
rooted in the strong field, vertical patches of flux. We conjecture that
vertical flux tubes with large expansion around the photosphere-corona boundary
serve as efficient chimneys for Alfven waves that accelerate the solar wind.
|
[{'version': 'v1', 'created': 'Tue, 29 Jul 2008 11:03:40 GMT'}
{'version': 'v2', 'created': 'Fri, 8 Aug 2008 17:08:05 GMT'}]
|
2009-11-13
|
[array(['Tsuneta', 'S.', ''], dtype=object)
array(['Ichimoto', 'K.', ''], dtype=object)
array(['Katsukawa', 'Y.', ''], dtype=object)
array(['Lites', 'B. W.', ''], dtype=object)
array(['Matsuzaki', 'K.', ''], dtype=object)
array(['Nagata', 'S.', ''], dtype=object)
array(['Suarez', 'D. Orozco', ''], dtype=object)
array(['Shimizu', 'T.', ''], dtype=object)
array(['Shimojo', 'M.', ''], dtype=object)
array(['Shine', 'R. A.', ''], dtype=object)
array(['Suematsu', 'Y.', ''], dtype=object)
array(['Suzuki', 'T. K.', ''], dtype=object)
array(['Tarbell', 'T. D.', ''], dtype=object)
array(['Title', 'A. M.', ''], dtype=object)]
|
3,633 |
astro-ph/0407616
|
Wolfram Schmidt
|
W. Schmidt, W. Hillebrandt, J. C. Niemeyer
|
Numerical dissipation and the bottleneck effect in simulations of
compressible isotropic turbulence
|
23 pages, 7 figures. Revised version accepted by Comp. Fluids. Not
all figures included due to size restriction. Complete PDF available at
http://www.astro.uni-wuerzburg.de/%7Eschmidt/Paper/NumDiss_CF.pdf
| null | null | null |
astro-ph physics.flu-dyn
| null |
The piece-wise parabolic method (PPM) is applied to simulations of forced
isotropic turbulence with Mach numbers $\sim 0.1... 1$. The equation of state
is dominated by the Fermi pressure of an electron-degenerate fluid. The
dissipation in these simulations is of purely numerical origin. For the
dimensionless mean rate of dissipation, we find values in agreement with known
results from mostly incompressible turbulence simulations. The calculation of a
Smagorinsky length corresponding to the rate of numerical dissipation supports
the notion of the PPM supplying an implicit subgrid scale model. In the
turbulence energy spectra of various flow realisations, we find the so-called
bottleneck phenomenon, i.e., a flattening of the spectrum function near the
wavenumber of maximal dissipation. The shape of the bottleneck peak in the
compensated spectrum functions is comparable to what is found in turbulence
simulations with hyperviscosity. Although the bottleneck effect reduces the
range of nearly inertial length scales considerably, we are able to estimate
the value of the Kolmogorov constant. For steady turbulence with a balance
between energy injection and dissipation, it appears that $C\approx 1.7$.
However, a smaller value is found in the case of transonic turbulence with a
large fraction of compressive components in the driving force. Moreover, we
discuss length scales related to the dissipation, in particular, an effective
numerical length scale $\Delta_{\mathrm{eff}}$, which can be regarded as the
characteristic smoothing length of the implicit filter associated with the PPM.
|
[{'version': 'v1', 'created': 'Thu, 29 Jul 2004 16:29:51 GMT'}
{'version': 'v2', 'created': 'Tue, 15 Mar 2005 17:09:45 GMT'}]
|
2007-05-23
|
[array(['Schmidt', 'W.', ''], dtype=object)
array(['Hillebrandt', 'W.', ''], dtype=object)
array(['Niemeyer', 'J. C.', ''], dtype=object)]
|
3,634 |
2007.07397
|
Xi Deng
|
Xi Deng, Zhen-hua Jiang, Peter Vincent, Feng Xiao, Chao Yan
|
A new paradigm of dissipation-controllable, multi-scale resolving
schemes for compressible flows
| null | null | null | null |
physics.comp-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The scale-resolving simulation of high speed compressible flow through direct
numerical simulation (DNS) or large eddy simulation (LES) requires
shock-capturing schemes to be more accurate for resolving broadband turbulence
and robust for capturing strong shock waves. In this work, we develop a new
paradigm of dissipation-controllable, shock capturing scheme to resolve
multi-scale flow structures in high speed compressible flow. This novel
paradigm of shock-capturing scheme is named as PnTm-BVD-CD. The proposed
PnTm-BVD-CD scheme has following desirable properties. First, it can capture
large-scale discontinuous structures such as strong shock waves without obvious
non-physical oscillations while resolving sharp contact, material interface and
shear layer. Secondly, the numerical dissipation property of PnTm-BVD-CD can be
effectively controlled between n+1 order upwind-biased scheme and
non-dissipative n+2 order central scheme through a simple tunable parameter
$\lambda$. Thirdly, with $\lambda=0.5$ the scheme can recover to n+2 order
non-dissipative central interpolation for smooth solution over all wavenumber,
which is preferable for solving small-scale structures in DNS as well as
resolvable-scale in explicit LES. Finally, the under-resolved small-scale can
be solved with dissipation controllable algorithm through so-called implicit
LES (ILES) approach.
|
[{'version': 'v1', 'created': 'Tue, 14 Jul 2020 23:17:36 GMT'}]
|
2020-07-16
|
[array(['Deng', 'Xi', ''], dtype=object)
array(['Jiang', 'Zhen-hua', ''], dtype=object)
array(['Vincent', 'Peter', ''], dtype=object)
array(['Xiao', 'Feng', ''], dtype=object)
array(['Yan', 'Chao', ''], dtype=object)]
|
3,635 |
2105.05559
|
Hans Weytjens
|
Hans Weytjens and Jochen De Weerdt
|
Learning Uncertainty with Artificial Neural Networks for Improved
Remaining Time Prediction of Business Processes
|
Accepted for the main conference at the Business Process Management
Conferences 2021, 6-10 September 2021, Rome, Italy
| null | null | null |
cs.LG cs.AI
|
http://creativecommons.org/licenses/by/4.0/
|
Artificial neural networks will always make a prediction, even when
completely uncertain and regardless of the consequences. This obliviousness of
uncertainty is a major obstacle towards their adoption in practice. Techniques
exist, however, to estimate the two major types of uncertainty: model
uncertainty and observation noise in the data. Bayesian neural networks are
theoretically well-founded models that can learn the model uncertainty of their
predictions. Minor modifications to these models and their loss functions allow
learning the observation noise for individual samples as well. This paper is
the first to apply these techniques to predictive process monitoring. We found
that they contribute towards more accurate predictions and work quickly.
However, their main benefit resides with the uncertainty estimates themselves
that allow the separation of higher-quality from lower-quality predictions and
the building of confidence intervals. This leads to many interesting
applications, enables an earlier adoption of prediction systems with smaller
datasets and fosters a better cooperation with humans.
|
[{'version': 'v1', 'created': 'Wed, 12 May 2021 10:18:57 GMT'}]
|
2021-05-13
|
[array(['Weytjens', 'Hans', ''], dtype=object)
array(['De Weerdt', 'Jochen', ''], dtype=object)]
|
3,636 |
1207.3878
|
Cheng Yeaw Ku
|
Cheng Yeaw Ku and Kok Bin Wong
|
Solving the Ku-Wales conjecture on the eigenvalues of the derangement
graph
| null | null | null | null |
math.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We give a new recurrence formula for the eigenvalues of the derangement
graph. Consequently, we provide a simpler proof of the Alternating Sign
Property of the derangement graph. Moreover, we prove that the absolute value
of the eigenvalue decreases whenever the corresponding partition decreases in
the dominance order. In particular, this settles affirmatively a conjecture of
Ku and Wales (J. of Combin. Theory, Series A 117 (2010) 289--312) regarding the
lower and upper bound for the absolute values of these eigenvalues.
|
[{'version': 'v1', 'created': 'Tue, 17 Jul 2012 04:58:24 GMT'}]
|
2012-07-18
|
[array(['Ku', 'Cheng Yeaw', ''], dtype=object)
array(['Wong', 'Kok Bin', ''], dtype=object)]
|
3,637 |
1510.03549
|
Manuela Temmer
|
S. Krauss, M. Temmer, A.M. Veronig, O. Baur, H. Lammer
|
Thermosphere and geomagnetic response to interplanetary coronal mass
ejections observed by ACE and GRACE: Statistical results
|
published in JGR
| null |
10.1002/2015JA021702
| null |
astro-ph.EP physics.space-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
For the period July 2003 to August 2010, the interplanetary coronal mass
ejection (ICME) catalogue maintained by Richardson and Cane lists 106
Earth-directed events, which have been measured in-situ by plasma and field
instruments onboard the ACE satellite. We present a statistical investigation
of the Earth's thermospheric neutral density response by means of accelerometer
measurements collected by the GRACE satellites, which are available for 104
ICMEs in the data set, and its relation to various geomagnetic indices and
characteristic ICME parameters such as the impact speed, southward magnetic
field strength (Bz). The majority of ICMEs causes a distinct density
enhancement in the thermosphere, with up to a factor of eight compared to the
pre-event level. We find high correlations between ICME Bz and thermospheric
density enhancements (~0.9), while the correlation with the ICME impact speed
is somewhat smaller (~0.7). The geomagnetic indices revealing the highest
correlations are Dst and SYM-H (~0.9), the lowest correlations are obtained for
kp and AE (~0.7), which show a nonlinear relation with the thermospheric
density enhancements. Separating the response for the shock sheath region and
the magnetic structure of the ICME, we find that the Dst and SYM-H reveal a
tighter relation to the Bz minimum in the magnetic structure of the ICME,
whereas the polar cap indices show higher correlations with the Bz minimum in
the shock sheath region. Since the strength of the Bz component - either in the
sheath or the magnetic structure of the ICME - is highly correlated (~0.9) with
the neutral density enhancement, we discuss the possibility of satellite
orbital decay estimates based on magnetic field measurements at L1, i.e. before
the ICME hits the Earth's magnetosphere. This will further stimulate progress
in space weather understanding and applications regarding satellite operations.
|
[{'version': 'v1', 'created': 'Tue, 13 Oct 2015 06:46:43 GMT'}]
|
2015-10-14
|
[array(['Krauss', 'S.', ''], dtype=object)
array(['Temmer', 'M.', ''], dtype=object)
array(['Veronig', 'A. M.', ''], dtype=object)
array(['Baur', 'O.', ''], dtype=object)
array(['Lammer', 'H.', ''], dtype=object)]
|
3,638 |
1911.11705
|
Kuo-Shiuan Peng
|
Kuo-Shiuan Peng and Gregory Ditzler and Jerzy Rozenblit
|
Edge-Guided Occlusion Fading Reduction for a Light-Weighted
Self-Supervised Monocular Depth Estimation
| null | null | null | null |
cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Self-supervised monocular depth estimation methods generally suffer the
occlusion fading issue due to the lack of supervision by the per pixel ground
truth. Although a post-processing method was proposed by Godard et. al. to
reduce the occlusion fading, the compensated results have a severe halo effect.
In this paper, we propose a novel Edge-Guided post-processing to reduce the
occlusion fading issue for self-supervised monocular depth estimation. We
further introduce Atrous Spatial Pyramid Pooling (ASPP) into the network to
reduce the computational costs and improve the inference performance. The
proposed ASPP-based network is lighter, faster, and better than current
commonly used depth estimation networks. This light-weight network only needs
8.1 million parameters and can achieve up to 40 frames per second for
$256\times512$ input in the inference stage using a single nVIDIA GTX1080 GPU.
The proposed network also outperforms the current state-of-the-art on the KITTI
benchmarks. The ASPP-based network and Edge-Guided post-processing produce
better results either quantitatively and qualitatively than the competitors.
|
[{'version': 'v1', 'created': 'Tue, 26 Nov 2019 17:19:19 GMT'}]
|
2019-11-27
|
[array(['Peng', 'Kuo-Shiuan', ''], dtype=object)
array(['Ditzler', 'Gregory', ''], dtype=object)
array(['Rozenblit', 'Jerzy', ''], dtype=object)]
|
3,639 |
1208.2280
|
Xingting Wang
|
Xingting Wang
|
Connected Hopf Algebras of Dimension $p^2$
|
Accepted by Journal of Algebra, 29 pages
|
J. Algebra 391(2013) 93-113
|
10.1016/j.jalgebra.2013.06.008
| null |
math.RA math.QA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Let $H$ be a finite-dimensional connected Hopf algebra over an algebraically
closed field $\field$ of characteristic $p>0$. We provide the algebra structure
of the associated graded Hopf algebra $\gr H$. Then, we study the case when $H$
is generated by a Hopf subalgebra $K$ and another element and the case when $H$
is cocommutative. When $H$ is a restricted universal enveloping algebra, we
give a specific basis for the second term of the Hochschild cohomology of the
coalgebra $H$ with coefficients in the trivial $H$-bicomodule $\field$.
Finally, we classify all connected Hopf algebras of dimension $p^2$ over
$\field$.
|
[{'version': 'v1', 'created': 'Fri, 10 Aug 2012 20:24:54 GMT'}
{'version': 'v2', 'created': 'Tue, 18 Jun 2013 05:16:39 GMT'}]
|
2013-08-06
|
[array(['Wang', 'Xingting', ''], dtype=object)]
|
3,640 |
1907.01068
|
Robert Bamler
|
Robert Bamler, Farnood Salehi, and Stephan Mandt
|
Augmenting and Tuning Knowledge Graph Embeddings
|
Published version, Conference on Uncertainty in Artificial
Intelligence (UAI 2019)
| null | null | null |
stat.ML cs.AI cs.LG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Knowledge graph embeddings rank among the most successful methods for link
prediction in knowledge graphs, i.e., the task of completing an incomplete
collection of relational facts. A downside of these models is their strong
sensitivity to model hyperparameters, in particular regularizers, which have to
be extensively tuned to reach good performance [Kadlec et al., 2017]. We
propose an efficient method for large scale hyperparameter tuning by
interpreting these models in a probabilistic framework. After a model
augmentation that introduces per-entity hyperparameters, we use a variational
expectation-maximization approach to tune thousands of such hyperparameters
with minimal additional cost. Our approach is agnostic to details of the model
and results in a new state of the art in link prediction on standard benchmark
data.
|
[{'version': 'v1', 'created': 'Mon, 1 Jul 2019 20:40:37 GMT'}]
|
2019-07-03
|
[array(['Bamler', 'Robert', ''], dtype=object)
array(['Salehi', 'Farnood', ''], dtype=object)
array(['Mandt', 'Stephan', ''], dtype=object)]
|
3,641 |
1008.1535
|
Sanja Danilovic
|
S. Danilovic, B. Beeck, A. Pietarila, M. Schuessler, S. K. Solanki, V.
Martinez Pillet, J. A. Bonet, J. C. del Toro Iniesta, V. Domingo, P. Barthol,
T. Berkefeld, A. Gandorfer, M. Knoelker, W. Schmidt, A. M. Title
|
Transverse component of the magnetic field in the solar photosphere
observed by Sunrise
|
Accepted for the Sunrise Special Issue of ApJL
| null |
10.1088/2041-8205/723/2/L149
| null |
astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the first observations of the transverse component of photospheric
magnetic field acquired by the imaging magnetograph Sunrise/IMaX. Using an
automated detection method, we obtain statistical properties of 4536 features
with significant linear polarization signal. Their rate of occurrence is 1-2
orders of magnitude larger than values reported by previous studies. We show
that these features have no characteristic size or lifetime. They appear
preferentially at granule boundaries with most of them being caught in downflow
lanes at some point in their evolution. Only a small percentage are entirely
and constantly embedded in upflows (16%) or downflows (8%).
|
[{'version': 'v1', 'created': 'Mon, 9 Aug 2010 15:49:17 GMT'}]
|
2015-05-19
|
[array(['Danilovic', 'S.', ''], dtype=object)
array(['Beeck', 'B.', ''], dtype=object)
array(['Pietarila', 'A.', ''], dtype=object)
array(['Schuessler', 'M.', ''], dtype=object)
array(['Solanki', 'S. K.', ''], dtype=object)
array(['Pillet', 'V. Martinez', ''], dtype=object)
array(['Bonet', 'J. A.', ''], dtype=object)
array(['Iniesta', 'J. C. del Toro', ''], dtype=object)
array(['Domingo', 'V.', ''], dtype=object)
array(['Barthol', 'P.', ''], dtype=object)
array(['Berkefeld', 'T.', ''], dtype=object)
array(['Gandorfer', 'A.', ''], dtype=object)
array(['Knoelker', 'M.', ''], dtype=object)
array(['Schmidt', 'W.', ''], dtype=object)
array(['Title', 'A. M.', ''], dtype=object)]
|
3,642 |
hep-th/0509080
|
Giuseppe Milanesi
|
Giuseppe Milanesi and Mihail Mintchev
|
Aspects of Finite Temperature Quantum Field Theory in a Black Hole
Background
|
LaTeX, 23 pages. v2: reference added
| null | null |
SISSA 63/2005/EP, IFUP-TH 19/2005
|
hep-th gr-qc
| null |
We quantize a scalar field at finite temperature T in the background of a
classical black hole, adopting 't Hooft's ``brick wall'' model with generic
mixed boundary conditions at the brick wall boundary. We first focus on the
exactly solvable case of two dimensional space-time. As expected, the energy
density is integrable in the limit of vanishing brick wall thickness only for
T=T_H - the Hawking temperature. Consistently with the most general stress
energy tensor allowed in this background, the energy density shows a surface
contribution localized on the horizon. We point out that the usual divergences
occurring in the entropy of the thermal atmosphere are due to the assumption
that the third law of thermodynamics holds for the quantum field in the black
hole background. Such divergences can be avoided if we abandon this assumption.
The entropy density also has a surface term localized on the horizon, which is
open to various interpretations. The extension of these results to higher
space-time dimensions is briefly discussed.
|
[{'version': 'v1', 'created': 'Mon, 12 Sep 2005 13:20:13 GMT'}
{'version': 'v2', 'created': 'Mon, 26 Sep 2005 12:33:50 GMT'}]
|
2007-05-23
|
[array(['Milanesi', 'Giuseppe', ''], dtype=object)
array(['Mintchev', 'Mihail', ''], dtype=object)]
|
3,643 |
astro-ph/0509571
|
Bing Zhang
|
Bing Zhang (UNLV)
|
Gamma-Ray Burst Early Afterglows
|
8 pages, 2 figures, to appear in Proc. of "Astrophysics Sources of
High Energy Particles and Radiation" (eds. T. Bulik, G. Madejski and B.
Rudak), Torun, Poland, 20-24 June, 2005
|
AIP Conf.Proc.801:106-113,2006
|
10.1063/1.2141841
| null |
astro-ph
| null |
The successful launch and operation of NASA's Swift Gamma-Ray Burst Explorer
open a new era for the multi-wavelength study of the very early afterglow phase
of gamma-ray bursts (GRBs). GRB early afterglow information is essential to
explore the unknown physical composition of GRB jets, the link between the
prompt gamma-ray emission and the afterglow emission, the GRB central engine
activity, as well as the immediate GRB environment. Here I review some of the
recent theoretical efforts to address these problems and describe how the
latest Swift data give answers to these outstanding questions.
|
[{'version': 'v1', 'created': 'Mon, 19 Sep 2005 23:38:19 GMT'}]
|
2009-11-13
|
[array(['Zhang', 'Bing', '', 'UNLV'], dtype=object)]
|
3,644 |
2209.01271
|
St\'ephane Job
|
Ren\'e Zu\~niga, Germ\'an Varas and St\'ephane Job
|
Geometry-controlled phase transition in vibrated granular media
|
13 pages, 5 figures
|
Sci Rep 12, 14989 (2022)
|
10.1038/s41598-022-18965-4
| null |
cond-mat.soft
|
http://creativecommons.org/licenses/by/4.0/
|
We report experiments on the dynamics of vibrated particles constrained in a
two-dimensional vertical container, motivated by the following question: how to
get the most out of a given external vibration to maximize internal disorder
(e.g. to blend particles) and agitation (e.g. to absorb vibrations)? Granular
media are analogs to classical thermodynamic systems, where the injection of
energy can be achieved by shaking them: fluidization arises by tuning either
the amplitude or the frequency of the oscillations. Alternatively, we explore
what happens when another feature, the container geometry, is modified while
keeping constant the energy injection. Our method consists in modifying the
container base into a V-shape to break the symmetries of the inner particulate
arrangement. The lattice contains a compact hexagonal solid-like crystalline
phase coexisting with a loose amorphous fluid-like phase, at any thermal
agitation. We show that both the solid-to-fluid volume fraction and the
granular temperature depend not only on the external vibration but also on the
number of topological defects triggered by the asymmetry of the container. The
former relies on the statistics of the energy fluctuations and the latter is
consistent with a two-dimensional melting transition described by the KTHNY
theory.
|
[{'version': 'v1', 'created': 'Fri, 2 Sep 2022 20:46:16 GMT'}]
|
2022-09-07
|
[array(['Zuñiga', 'René', ''], dtype=object)
array(['Varas', 'Germán', ''], dtype=object)
array(['Job', 'Stéphane', ''], dtype=object)]
|
3,645 |
1212.6241
|
Harry Boyer
|
Fran\c{c}ois Garde (PIMENT), Harry Boyer (PIMENT), Robert Celaire,
Laurent Seauve
|
Building design in tropical climates. Elaboration of the ECODOM standard
in the french tropical islands
|
ISES'99, International Solar Energy Society, J\'erusalem : Israel
(1999). arXiv admin note: substantial text overlap with arXiv:1212.3925,
arXiv:1212.5252
| null | null | null |
cs.OH
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper deals with the elaboration of global quality standards for natural
and low energy cooling in french tropical island buildings. Electric load
profiles of tropical islands in developed countries are characterised by
morning, midday and evening peaks arising from all year round high power demand
in the commercial and residential sectors, mostly due to air conditioning
appliances and bad thermal conception of the building. In early 1995, a DSM
pilot initiative has been launched in the french islands of Guadeloupe and
Reunion through a partnership between the French Public Utility EDF,
institutions involved in energy conservation, environment preservation (ADEME)
and construction quality improvment, the University of Reunion Island and
several other public and private partners (low cost housing institutions,
architects, energy consultant, etc...) to set up a standard in the thermal
conception of buildings in tropical climates. This has led to definition of
optimized bioclimatic urban planning and architectural design, the use of
passive cooling architectural components, natural ventilation and energy
efficient systems. The impact of each technical solution on the thermal comfort
within the building was evaluated with an airflow and thermal building
simulation software (CODYRUN). These technical solutions have been edited in a
pedagogical reference document and have been implemented in 300 new pilot
dwelling projects through the year 1996 in Reunion Island and in Guadeloupe
island. An experimental follow up is still in process in the first ECODOM
dwellings for an experimental validation of the impact of the passive cooling
solutions on the comfort of the occupants and to modify them if necessary.
|
[{'version': 'v1', 'created': 'Fri, 21 Dec 2012 18:54:26 GMT'}]
|
2012-12-27
|
[array(['Garde', 'François', '', 'PIMENT'], dtype=object)
array(['Boyer', 'Harry', '', 'PIMENT'], dtype=object)
array(['Celaire', 'Robert', ''], dtype=object)
array(['Seauve', 'Laurent', ''], dtype=object)]
|
3,646 |
1503.01020
|
Fabio Cavalletti
|
Fabio Cavalletti and Tapio Rajala
|
Tangent lines and Lipschitz differentiability spaces
|
16 pages
| null | null | null |
math.MG math.CA math.FA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the existence of tangent lines, i.e. subsets of the tangent space
isometric to the real line, in tangent spaces of metric spaces. We first
revisit the almost everywhere metric differentiability of Lipschitz continuous
curves. We then show that any blow-up done at a point of metric
differentiability and of density one for the domain of the curve gives a
tangent line.
Metric differentiability enjoys a Borel measurability property and this will
permit us to use it in the framework of Lipschitz differentiability spaces. We
show that any tangent space of a Lipschitz differentiability space contains at
least $n$ distinct tangent lines, obtained as the blow-up of $n$ Lipschitz
curves, where $n$ is the dimension of the local measurable chart. Under
additional assumptions on the space, such as curvature lower bounds, these $n$
distinct tangent lines span an $n$-dimensional part of the tangent space.
|
[{'version': 'v1', 'created': 'Tue, 3 Mar 2015 17:29:40 GMT'}
{'version': 'v2', 'created': 'Wed, 29 Apr 2015 08:18:50 GMT'}]
|
2015-04-30
|
[array(['Cavalletti', 'Fabio', ''], dtype=object)
array(['Rajala', 'Tapio', ''], dtype=object)]
|
3,647 |
2210.13388
|
Lorenzo Lupo
|
Lorenzo Lupo, Marco Dinarelli, Laurent Besacier
|
Focused Concatenation for Context-Aware Neural Machine Translation
|
WMT 2022 (camera ready)
| null | null | null |
cs.CL
|
http://creativecommons.org/licenses/by/4.0/
|
A straightforward approach to context-aware neural machine translation
consists in feeding the standard encoder-decoder architecture with a window of
consecutive sentences, formed by the current sentence and a number of sentences
from its context concatenated to it. In this work, we propose an improved
concatenation approach that encourages the model to focus on the translation of
the current sentence, discounting the loss generated by target context. We also
propose an additional improvement that strengthen the notion of sentence
boundaries and of relative sentence distance, facilitating model compliance to
the context-discounted objective. We evaluate our approach with both
average-translation quality metrics and contrastive test sets for the
translation of inter-sentential discourse phenomena, proving its superiority to
the vanilla concatenation approach and other sophisticated context-aware
systems.
|
[{'version': 'v1', 'created': 'Mon, 24 Oct 2022 16:41:22 GMT'}]
|
2022-10-25
|
[array(['Lupo', 'Lorenzo', ''], dtype=object)
array(['Dinarelli', 'Marco', ''], dtype=object)
array(['Besacier', 'Laurent', ''], dtype=object)]
|
3,648 |
1107.4031
|
Anthony J. Short
|
Sabri W. Al-Safi and Anthony J. Short
|
Information causality from an entropic and a probabilistic perspective
|
7 pages, v2: some references added and minor improvements
| null |
10.1103/PhysRevA.84.042323
| null |
quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The information causality principle is a generalisation of the no-signalling
principle which implies some of the known restrictions on quantum correlations.
But despite its clear physical motivation, information causality is formulated
in terms of a rather specialised game and figure of merit. We explore different
perspectives on information causality, discussing the probability of success as
the figure of merit, a relation between information causality and the non-local
`inner-product game', and the derivation of a quadratic bound for these games.
We then examine an entropic formulation of information causality with which one
can obtain the same results, arguably in a simpler fashion.
|
[{'version': 'v1', 'created': 'Wed, 20 Jul 2011 16:53:16 GMT'}
{'version': 'v2', 'created': 'Tue, 6 Sep 2011 13:11:54 GMT'}]
|
2013-05-29
|
[array(['Al-Safi', 'Sabri W.', ''], dtype=object)
array(['Short', 'Anthony J.', ''], dtype=object)]
|
3,649 |
1012.5586
|
Franz Lehner
|
G.P. Chistyakov, F. G\"otze, F. Lehner
|
Freeness of Linear and Quadratic Forms in von Neumann Algebras
|
15 pages; AMS-LaTeX, to appear in J Funct An
|
J. Funct. An. 261 (2011), no. 10, 2829-2844
|
10.1016/j.jfa.2011.07.012
| null |
math.OA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We characterize semicircular distribution by the freeness of linear and
quadratic forms in noncommutative random variables from a tracial
$W^*$-probability space with relaxed moment conditions.
|
[{'version': 'v1', 'created': 'Mon, 27 Dec 2010 10:03:39 GMT'}
{'version': 'v2', 'created': 'Fri, 17 Jun 2011 14:08:12 GMT'}]
|
2012-12-06
|
[array(['Chistyakov', 'G. P.', ''], dtype=object)
array(['Götze', 'F.', ''], dtype=object)
array(['Lehner', 'F.', ''], dtype=object)]
|
3,650 |
1803.08881
|
Moshe Adrian
|
Moshe Adrian and Eyal Kaplan
|
The Langlands parameter of a simple supercuspidal representation:
Symplectic groups
|
26 pages, corrected typos, revised introduction. Final version
| null | null | null |
math.RT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Let $\pi$ be a simple supercuspidal representation of the symplectic group
$Sp_{2l}(F)$, over a $p$-adic field $F$. In this work, we explicitly compute
the Rankin-Selberg $\gamma$-factor of rank-$1$ twists of $\pi$. We then
completely determine the Langlands parameter of $\pi$, if $p \neq 2$. In the
case that $F = \mathbb{Q}_2$, we give a conjectural description of the
functorial lift of $\pi$, with which, using a recent work of Bushnell and
Henniart, one can obtain its Langlands parameter.
|
[{'version': 'v1', 'created': 'Fri, 23 Mar 2018 16:55:29 GMT'}
{'version': 'v2', 'created': 'Wed, 20 Jun 2018 17:21:32 GMT'}]
|
2018-06-21
|
[array(['Adrian', 'Moshe', ''], dtype=object)
array(['Kaplan', 'Eyal', ''], dtype=object)]
|
3,651 |
1508.02629
|
Andrea Ghiglietti
|
Giacomo Aletti, Andrea Ghiglietti and Anand Vidyashankar
|
Dynamics of an Adaptive Randomly Reinforced Urn
|
arXiv admin note: text overlap with arXiv:1502.06130
|
Bernoulli, Volume 24, Number 3 (2018), 2204-2255
|
10.3150/17-BEJ926
| null |
math.PR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Adaptive randomly reinforced urn (ARRU) is a two-color urn model where the
updating process is defined by a sequence of non-negative random vectors
$\{(D_{1,n}, D_{2,n});n\geq1\}$ and randomly evolving thresholds which utilize
accruing statistical information for the updates. Let $m_1=E[D_{1,n}]$ and
$m_2=E[D_{2,n}]$. Motivated by applications, in this paper we undertake a
detailed study of the dynamics of the ARRU model. First, for the case $m_1 \neq
m_2$, we establish $L_1$ bounds on the increments of the urn proportion at
fixed and increasing times under very weak assumptions on the random threshold
sequence. As a consequence, we deduce weak consistency of the evolving urn
proportions. Second, under slightly stronger conditions, we establish the
strong consistency of the urn proportions for all finite values of $m_1$ and
$m_2$. Specifically, we show that when $m_1=m_2$ the proportion converges to a
non-degenerate random variable. Third, we establish the asymptotic
distribution, after appropriate centering and scaling, of the proportion of
sampled balls in the case $m_1=m_2$. In the process, we settle the issue of
asymptotic distribution of the number of sampled balls for a randomly
reinforced urn (RRU). To address the technical issues, we establish results on
the harmonic moments of the total number of balls in the urn at different times
under very weak conditions, which is of independent interest.
|
[{'version': 'v1', 'created': 'Tue, 11 Aug 2015 15:31:42 GMT'}]
|
2019-09-27
|
[array(['Aletti', 'Giacomo', ''], dtype=object)
array(['Ghiglietti', 'Andrea', ''], dtype=object)
array(['Vidyashankar', 'Anand', ''], dtype=object)]
|
3,652 |
math/9803125
|
Hans Schneider
|
J.J.McDonald (U. Regina), R. Nabben (U.Bielefeld), M. Neumann (U.
Connecticut), H. Schneider (U.Wisconsin), M.Tsatsomeros (U. Regina)
|
Inverse tridiagonal Z-matrices
| null | null | null |
formerly math.LA/9803125
|
math.RA math.CO
| null |
In this paper, we consider matrices whose inverses are tridiagonal
Z--matrices. Based on a characterization of symmetric tridiagonal matrices by
Gantmacher and Krein, we show that a matrix is the inverse of a tridiagonal
Z--matrix if and only if, up to a positive scaling of the rows, it is the
Hadamard product of a so called weak type $\D$ matrix and a flipped weak type
$\D$ matrix whose parameters satisfy certain quadratic conditions. We predict
from these parameters to which class of Z--matrices the inverse belongs to. In
particular, we give a characterization of inverse tridiagonal M--matrices.
Moreover, we characterize inverses of tridiagonal M--matrices that satisfy
certain row sum criteria. This leads to the cyclopses that are matrices
constructed from type $\D$ and flipped type $\D$ matrices. We establish some
properties of the cyclopses and provide explicit formulae for the entries of
the inverse of a nonsingular cyclops. We also show that the cyclopses are the
only generalized ultrametric matrices whose inverses are tridiagonal.
|
[{'version': 'v1', 'created': 'Wed, 25 Mar 1998 20:43:45 GMT'}]
|
2007-05-23
|
[array(['McDonald', 'J. J.', '', 'U. Regina'], dtype=object)
array(['Nabben', 'R.', '', 'U.Bielefeld'], dtype=object)
array(['Neumann', 'M.', '', 'U.\n Connecticut'], dtype=object)
array(['Schneider', 'H.', '', 'U.Wisconsin'], dtype=object)
array(['Tsatsomeros', 'M.', '', 'U. Regina'], dtype=object)]
|
3,653 |
1712.08861
|
Brian Willett
|
Chiara Toldo and Brian Willett
|
Partition functions on 3d circle bundles and their gravity duals
|
typos in eqs 5.51 and subsequent fixed, conclusions unaltered
| null |
10.1007/JHEP05(2018)116
| null |
hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The partition function of a three-dimensional $\mathcal{N} =2$ theory on the
manifold $\mathcal{M}_{g,p}$, an $S^1$ bundle of degree $p$ over a closed
Riemann surface $\Sigma_g$, was recently computed via supersymmetric
localization. In this paper, we compute these partition functions at large $N$
in a class of quiver gauge theories with holographic M-theory duals. We provide
the supergravity bulk dual having as conformal boundary such three-dimensional
circle bundles. These configurations are solutions to $\mathcal{N}=2$ minimal
gauged supergravity and pertain to the class of Taub-NUT-AdS and Taub-Bolt-AdS
preserving $1/4$ of the supersymmetries. We discuss the conditions for the
uplift of these solutions to M-theory, and compute the on-shell action via
holographic renormalization. We show that the uplift condition and on-shell
action for the Bolt solutions are correctly reproduced by the large $N$ limit
of the partition function of the dual superconformal field theory. In
particular, the $\Sigma_g \times S^1 \cong \mathcal{M}_{g,0}$ partition
function, which was recently shown to match the entropy of $AdS_4$ black holes,
and the $S^3 \cong \mathcal{M}_{0,1}$ free energy, occur as special cases of
our formalism, and we comment on relations between them.
|
[{'version': 'v1', 'created': 'Sat, 23 Dec 2017 23:36:06 GMT'}
{'version': 'v2', 'created': 'Tue, 27 Mar 2018 02:49:05 GMT'}
{'version': 'v3', 'created': 'Tue, 2 Oct 2018 04:39:32 GMT'}]
|
2018-10-03
|
[array(['Toldo', 'Chiara', ''], dtype=object)
array(['Willett', 'Brian', ''], dtype=object)]
|
3,654 |
1208.4041
|
Samir Genaim
|
Amir M. Ben-Amram and Samir Genaim
|
Ranking Functions for Linear-Constraint Loops
|
51 pages, extended and revised version of the POPL'13 paper
| null | null | null |
cs.PL cs.LO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we study the complexity of the problems: given a loop,
described by linear constraints over a finite set of variables, is there a
linear or lexicographical-linear ranking function for this loop? While
existence of such functions implies termination, these problems are not
equivalent to termination. When the variables range over the rationals (or
reals), it is known that both problems are PTIME decidable. However, when they
range over the integers, whether for single-path or multipath loops, the
complexity has not yet been determined. We show that both problems are
coNP-complete. However, we point out some special cases of importance of PTIME
complexity. We also present complete algorithms for synthesizing linear and
lexicographical-linear ranking functions, both for the general case and the
special PTIME cases. Moreover, in the rational setting, our algorithm for
synthesizing lexicographical-linear ranking functions extends existing ones,
because our class of ranking functions is more general, yet it has polynomial
time complexity.
|
[{'version': 'v1', 'created': 'Mon, 20 Aug 2012 15:25:45 GMT'}
{'version': 'v2', 'created': 'Tue, 29 Jan 2013 11:51:29 GMT'}
{'version': 'v3', 'created': 'Tue, 9 Jul 2013 09:09:24 GMT'}]
|
2013-07-10
|
[array(['Ben-Amram', 'Amir M.', ''], dtype=object)
array(['Genaim', 'Samir', ''], dtype=object)]
|
3,655 |
hep-ph/0112184
|
Czyz Henryk
|
G. Rodrigo, H. Czyz, J. H. Kuhn and M. Szopa
|
Radiative return at NLO and the measurement of the hadronic
cross-section in electron-positron annihilation
|
13 pages, 15 figures
|
Eur.Phys.J.C24:71-82,2002
|
10.1007/s100520200912
|
CERN-TH/2001-350, TTP01-32
|
hep-ph
| null |
Electron-positron annihilation into hadrons plus an energetic photon from
initial state radiation allows the hadronic cross-section to be measured over a
wide range of energies. The full next-to-leading order QED corrections for the
cross-section for e^+ e^- annihilation into a real tagged photon and a virtual
photon converting into hadrons are calculated where the tagged photon is
radiated off the initial electron or positron. This includes virtual and soft
photon corrections to the process e^+ e^- \to \gamma +\gamma^* and the emission
of two real hard photons: e^+ e^- \to \gamma + \gamma + \gamma^*. A Monte Carlo
generator has been constructed, which incorporates these corrections and
simulates the production of two charged pions or muons plus one or two photons.
Predictions are presented for centre-of-mass energies between 1 and 10 GeV,
corresponding to the energies of DAPHNE, CLEO-C and B-meson factories.
|
[{'version': 'v1', 'created': 'Thu, 13 Dec 2001 17:02:37 GMT'}]
|
2011-09-13
|
[array(['Rodrigo', 'G.', ''], dtype=object)
array(['Czyz', 'H.', ''], dtype=object)
array(['Kuhn', 'J. H.', ''], dtype=object)
array(['Szopa', 'M.', ''], dtype=object)]
|
3,656 |
2112.03408
|
Xian Chen
|
Xian Chen (PKU), Yu Qiu (PKU), Shuo Li (NAOC), F. K. Liu (PKU)
|
Milli-Hertz Gravitational Wave Background Produced by Quasi-Periodic
Eruptions
|
7 pages, 3 figures, comments welcome!
| null |
10.3847/1538-4357/ac63bf
| null |
astro-ph.HE gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Extreme-mass-ratio inspirals (EMRIs) are important targets for future
space-borne gravitational-wave (GW) detectors, such as the Laser Interferometer
Sapce Antenna (LISA). Recent works suggest that EMRI may reside in a population
of newly discovered X-ray transients called "quasi-periodic eruptions" (QPEs).
Here we follow this scenario and investigate the detectability of the five
recently discovered QPEs by LISA. We consider two specific models in which the
QPEs are made of either stellar-mass objects moving on circular orbits around
massive black holes (MBHs) or white dwarfs (WDs) on eccentric orbits around
MBHs. We find that in either case each QPE is too weak to be resolvable by
LISA. However, if QPEs are made of eccentric WD-MBH binaries, they radiate GWs
in a wide range of frequencies. The broad spectra overlap to form a background
which, between $0.003-0.02$ Hz, exceeds the background known to exist due to
other types of sources. Presence of this GW background in the LISA band could
impact the future search for the seed black holes at high redshift as well as
the stellar-mass binary black holes in the local universe.
|
[{'version': 'v1', 'created': 'Mon, 6 Dec 2021 23:03:28 GMT'}]
|
2022-05-18
|
[array(['Chen', 'Xian', '', 'PKU'], dtype=object)
array(['Qiu', 'Yu', '', 'PKU'], dtype=object)
array(['Li', 'Shuo', '', 'NAOC'], dtype=object)
array(['Liu', 'F. K.', '', 'PKU'], dtype=object)]
|
3,657 |
1110.2396
|
Riccardo Albertoni
|
Riccardo Albertoni, Monica De Martino
|
Semantic Technology to Exploit Digital Content Exposed as Linked Data
|
Published in eChallenges e-2011 Conference Proceedings Paul
Cunningham and Miriam Cunningham (Eds) IIMC International Information
Management Corporation, 2011 ISBN: 978-1-905824-27-4
| null | null | null |
cs.DL
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The paper illustrates the research result of the application of semantic
technology to ease the use and reuse of digital contents exposed as Linked Data
on the web. It focuses on the specific issue of explorative research for the
resource selection: a context dependent semantic similarity assessment is
proposed in order to compare datasets annotated through terminologies exposed
as Linked Data (e.g. habitats, species). Semantic similarity is shown as a
building block technology to sift linked data resources. From semantic
similarity application, we derived a set of recommendations underlying open
issues in scaling the similarity assessment up to the Web of Data.
|
[{'version': 'v1', 'created': 'Tue, 11 Oct 2011 15:20:15 GMT'}]
|
2011-10-12
|
[array(['Albertoni', 'Riccardo', ''], dtype=object)
array(['De Martino', 'Monica', ''], dtype=object)]
|
3,658 |
1912.00285
|
Jay Rosen
|
Michael B. Marcus and Jay Rosen
|
Permanental sequences that are related to a Markov chain example of
Kolmogorov
| null | null | null | null |
math.PR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Permanental sequences with non-symmetric kernels that are generalization of
the potentials of a Markov chain with state space $\{0,1/2, \ldots,
1/n,\ldots\}$ that was introduced by Kolmogorov, are studied. Depending on a
parameter in the kernels we obtain an exact rate of divergence of the sequence
at $0$, an exact local modulus of continuity of the sequence at $0$, or a
precise bounded discontinuity for the sequence at $0$.
|
[{'version': 'v1', 'created': 'Sat, 30 Nov 2019 23:44:22 GMT'}
{'version': 'v2', 'created': 'Sun, 10 May 2020 02:53:57 GMT'}]
|
2020-05-12
|
[array(['Marcus', 'Michael B.', ''], dtype=object)
array(['Rosen', 'Jay', ''], dtype=object)]
|
3,659 |
1208.5384
|
Vladimir Spokoiny
|
Vladimir Spokoiny, Weining Wang, Wolfgang Karl H\"ardle
|
Local Quantile Regression
| null | null | null | null |
math.ST stat.TH
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Quantile regression is a technique to estimate conditional quantile curves.
It provides a comprehensive picture of a response contingent on explanatory
variables. In a flexible modeling framework, a specific form of the conditional
quantile curve is not a priori fixed. % Indeed, the majority of applications do
not per se require specific functional forms. This motivates a local parametric
rather than a global fixed model fitting approach. A nonparametric smoothing
estimator of the conditional quantile curve requires to balance between local
curvature and stochastic variability. In this paper, we suggest a local model
selection technique that provides an adaptive estimator of the conditional
quantile regression curve at each design point. Theoretical results claim that
the proposed adaptive procedure performs as good as an oracle which would
minimize the local estimation risk for the problem at hand. We illustrate the
performance of the procedure by an extensive simulation study and consider a
couple of applications: to tail dependence analysis for the Hong Kong stock
market and to analysis of the distributions of the risk factors of temperature
dynamics.
|
[{'version': 'v1', 'created': 'Mon, 27 Aug 2012 13:20:32 GMT'}
{'version': 'v2', 'created': 'Thu, 30 Aug 2012 19:36:14 GMT'}]
|
2012-08-31
|
[array(['Spokoiny', 'Vladimir', ''], dtype=object)
array(['Wang', 'Weining', ''], dtype=object)
array(['Härdle', 'Wolfgang Karl', ''], dtype=object)]
|
3,660 |
1004.0947
|
Ivar Martin
|
I. Martin, G\'abor B. Hal\'asz, L. N. Bulaevskii, A. E. Koshelev
|
Shunt-capacitor-assisted synchronization of oscillations in intrinsic
Josephson junctions stack
|
9 pages, 1 fig
| null |
10.1063/1.3467962
| null |
cond-mat.supr-con cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that shunt capacitor stabilizes synchronized oscillations in
intrinsic Josephson junction stacks biased by DC current. This synchronization
mechanism has an effect similar to the previously discussed radiative coupling
between junctions, however, it is not defined by the geometry of the stack. It
is particularly important in crystals with smaller number of junctions, where
radiation coupling is week, and is comparable with the effect of strong
super-radiation in crystal with many junctions. The shunt also helps to enter
the phase-locked regime in the beginning of oscillations, after switching on
the bias current. Shunt may be used to tune radiation power, which drops as
shunt capacitance increases.
|
[{'version': 'v1', 'created': 'Tue, 6 Apr 2010 19:57:54 GMT'}]
|
2015-05-18
|
[array(['Martin', 'I.', ''], dtype=object)
array(['Halász', 'Gábor B.', ''], dtype=object)
array(['Bulaevskii', 'L. N.', ''], dtype=object)
array(['Koshelev', 'A. E.', ''], dtype=object)]
|
3,661 |
2211.10599
|
Desong Kong
|
Desong Kong, Jie Shen, Li-Lian Wang, Shuhuang Xiang
|
Eigenvalue Analysis and Applications of the Legendre
Dual-Petrov-Galerkin Methods for Initial Value Problems
|
25 pages, 31 figures
| null | null | null |
math.NA cs.NA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we show that the eigenvalues and eigenvectors of the spectral
discretisation matrices resulted from the Legendre dual-Petrov-Galerkin (LDPG)
method for the $m$th-order initial value problem (IVP): $u^{(m)}(t)=\sigma
u(t),\, t\in (-1,1)$ with constant $\sigma\not=0$ and usual initial conditions
at $t=-1,$ are associated with the generalised Bessel polynomials (GBPs). The
essential idea of the analysis is to properly construct the basis functions for
the solution and its dual spaces so that the matrix of the $m$th derivative is
an identity matrix, and the mass matrix is then identical or approximately
equals to the Jacobi matrix of the three-term recurrence of GBPs with specific
integer parameters. This allows us to characterise the eigenvalue distributions
and identify the eigenvectors. As a by-product, we are able to answer some open
questions related to the very limited known results on the collocation method
at Legendre points (studied in 1980s) for the first-order IVP, by reformulating
it into a Petrov-Galerkin formulation. Moreover, we present two stable
algorithms for computing zeros of the GBPs, and develop a general space-time
spectral method for evolutionary PDEs using either the matrix diagonalisation,
which is restricted to a small number of unknowns in time due to the
ill-conditioning but is fully parallel, or the QZ decomposition which is
numerically stable for a large number of unknowns in time but involves
sequential computations. We provide ample numerical results to demonstrate the
high accuracy and robustness of the space-time spectral methods for some
interesting examples of linear and nonlinear wave problems.
|
[{'version': 'v1', 'created': 'Sat, 19 Nov 2022 06:24:42 GMT'}]
|
2022-11-22
|
[array(['Kong', 'Desong', ''], dtype=object)
array(['Shen', 'Jie', ''], dtype=object)
array(['Wang', 'Li-Lian', ''], dtype=object)
array(['Xiang', 'Shuhuang', ''], dtype=object)]
|
3,662 |
hep-ph/0401013
|
Dremin
|
I.M. Dremin
|
QCD and hybrid NBD on oscillating moments of multiplicity distributions
in lepton- and hadron-initiated reactions
|
8 pages, no figures, Phys. Lett. B
|
Phys.Atom.Nucl. 68 (2005) 119-123; Yad.Fiz. 68 (2005) 121-125
|
10.1134/1.1858565
| null |
hep-ph
| null |
QCD predictions for moments of multiplicity distributions are compared with
experimental data on e+e- collisions and their two-NBD fits. Moments of the
multiplicity distribution in a two-NBD model for 1.8 TeV pp collisions are
considered. Three-NBD model predictions and fits for pp at LHC energies are
also discussed. Analytic expressions for moments of hybrid NBD are derived and
used to get insight into jet parameters and multicomponent structure of the
processes. Interpretation of observed correlations is proposed.
|
[{'version': 'v1', 'created': 'Mon, 5 Jan 2004 08:41:51 GMT'}
{'version': 'v2', 'created': 'Tue, 6 Jan 2004 08:54:20 GMT'}]
|
2009-11-10
|
[array(['Dremin', 'I. M.', ''], dtype=object)]
|
3,663 |
1706.03610
|
Georg Wiese
|
Georg Wiese, Dirk Weissenborn, Mariana Neves
|
Neural Domain Adaptation for Biomedical Question Answering
| null | null | null | null |
cs.CL cs.AI cs.NE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Factoid question answering (QA) has recently benefited from the development
of deep learning (DL) systems. Neural network models outperform traditional
approaches in domains where large datasets exist, such as SQuAD (ca. 100,000
questions) for Wikipedia articles. However, these systems have not yet been
applied to QA in more specific domains, such as biomedicine, because datasets
are generally too small to train a DL system from scratch. For example, the
BioASQ dataset for biomedical QA comprises less then 900 factoid (single
answer) and list (multiple answers) QA instances. In this work, we adapt a
neural QA system trained on a large open-domain dataset (SQuAD, source) to a
biomedical dataset (BioASQ, target) by employing various transfer learning
techniques. Our network architecture is based on a state-of-the-art QA system,
extended with biomedical word embeddings and a novel mechanism to answer list
questions. In contrast to existing biomedical QA systems, our system does not
rely on domain-specific ontologies, parsers or entity taggers, which are
expensive to create. Despite this fact, our systems achieve state-of-the-art
results on factoid questions and competitive results on list questions.
|
[{'version': 'v1', 'created': 'Mon, 12 Jun 2017 13:08:21 GMT'}
{'version': 'v2', 'created': 'Thu, 15 Jun 2017 15:16:18 GMT'}]
|
2017-06-16
|
[array(['Wiese', 'Georg', ''], dtype=object)
array(['Weissenborn', 'Dirk', ''], dtype=object)
array(['Neves', 'Mariana', ''], dtype=object)]
|
3,664 |
1308.2610
|
Alexander Silenko
|
Alexander J. Silenko
|
Connection between beam polarization and systematical errors in storage
ring electric-dipole-moment experiments
|
9 pages
|
JETP Letters 98, 217 (2013)
|
10.7868/S0370274X13160017
| null |
hep-ex physics.acc-ph physics.atom-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Analysis of spin dynamics in storage ring electric-dipole-moment (EDM)
experiments ascertains that the use of initial vertical beam polarization
allows to cancel spin-dependent systematical errors imitating the EDM effect.
While the use of this polarization meets certain difficulties, it should be
considered as an alternative or supplementary possibility of fulfilling the EDM
experiment.
|
[{'version': 'v1', 'created': 'Mon, 12 Aug 2013 16:12:24 GMT'}]
|
2013-08-13
|
[array(['Silenko', 'Alexander J.', ''], dtype=object)]
|
3,665 |
1410.0588
|
Stefan Steinerberger
|
Stefan Steinerberger
|
A Rigidity Phenomenon for the Hardy-Littlewood Maximal Function
|
to appear in Studia Mathematica
| null | null | null |
math.CA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Hardy-Littlewood maximal function $\mathcal{M}$ and the trigonometric
function $\sin{x}$ are two central objects in harmonic analysis. We prove that
$\mathcal{M}$ characterizes $\sin{x}$ in the following way: let $f \in
C^{\alpha}(\mathbb{R}, \mathbb{R})$ be a periodic function and $\alpha > 1/2$.
If there exists a real number $0 < \gamma < \infty$ such that the averaging
operator $$ (A_xf)(r) = \frac{1}{2r}\int_{x-r}^{x+r}{f(z)dz}$$ has a critical
point in $r = \gamma$ for every $x \in \mathbb{R}$, then $$f(x) = a+b\sin{(cx +
d)} \qquad \mbox{for some}~a,b,c,d \in \mathbb{R}.$$ This statement can be used
to derive a characterization of trigonometric functions as those nonconstant
functions for which the computation of the maximal function $\mathcal{M}$ is as
simple as possible. The proof uses the Lindemann-Weierstrass theorem from
transcendental number theory.
|
[{'version': 'v1', 'created': 'Thu, 2 Oct 2014 15:26:22 GMT'}
{'version': 'v2', 'created': 'Wed, 14 Jan 2015 21:14:19 GMT'}
{'version': 'v3', 'created': 'Fri, 13 Nov 2015 19:06:34 GMT'}]
|
2015-11-16
|
[array(['Steinerberger', 'Stefan', ''], dtype=object)]
|
3,666 |
1709.00304
|
Bertrand Duclou\'e
|
B. Duclou\'e, T. Lappi, Y. Zhu
|
Implementing consistent NLO factorization in single inclusive forward
hadron production
|
7 pages, 1 figure. Contribution to DIS2017 proceedings
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Single inclusive forward hadron production in high-energy hadron collisions
can provide an important test of the Color Glass Condensate picture at small
$x$. Recent studies of this process at next-to-leading order have led to
problematic results, with cross sections becoming negative at large transverse
momenta. We study a new formulation of this quantity proposed recently by Iancu
et al. We show that it leads to physical results up to large transverse momenta
at fixed coupling. Taking into account running coupling effects in a way that
is consistent with existing DIS calculations still poses a challenge.
|
[{'version': 'v1', 'created': 'Fri, 1 Sep 2017 13:36:59 GMT'}]
|
2017-09-04
|
[array(['Ducloué', 'B.', ''], dtype=object)
array(['Lappi', 'T.', ''], dtype=object)
array(['Zhu', 'Y.', ''], dtype=object)]
|
3,667 |
1308.0226
|
Christian Leonard
|
Christian L\'eonard (MODAL'X)
|
Lazy random walks and optimal transport on graphs
| null |
Ann. Probab., 44(3), (2016), 1864-1915
| null | null |
math.MG math.PR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper is about the construction of displacement interpolations on a
discrete metric graph. Our approach is based on the approximation of any
optimal transport problem whose cost function is a distance on a discrete graph
by a sequence of Schr\"odinger problems associated with random walks whose jump
frequencies tend down to zero. Displacement interpolations are defined as the
limit of the time-marginal flows of the solutions to the Schr\"odinger
problems. This allows to work with these interpolations by doing stochastic
calculus on the approximating random walks which are regular objects, and then
to pass to the limit in a slowing down procedure. The main convergence results
are based on Gamma-convergence of entropy minimization problems. As a
by-product, we obtain new results about optimal transport on graphs.
|
[{'version': 'v1', 'created': 'Thu, 1 Aug 2013 14:40:08 GMT'}
{'version': 'v2', 'created': 'Tue, 12 Nov 2013 19:55:30 GMT'}]
|
2022-09-05
|
[array(['Léonard', 'Christian', '', "MODAL'X"], dtype=object)]
|
3,668 |
gr-qc/0003106
|
Walter Simon
|
Walter Simon
|
Conformal positive mass theorems
|
Latex, 9 pages, to appear in Lett. Math. Phys
|
Lett.Math.Phys. 50 (1999) 275-281
| null | null |
gr-qc
| null |
We show the following two extensions of the standard positive mass theorem
(one for either sign): Let (N,g) and (N,g') be asymptotically flat Riemannian
3-manifolds with compact interior and finite mass, such that g and g' are twice
Hoelder differentiable and related via the conformal rescaling g' = (phi^4).g,
with a twice Hoelder differentiable function phi>0. Assume further that the
corresponding Ricci scalars satisfy either R + (phi^4).R' >= 0 or R -
(phi^4).R' >= 0. Then the corresponding masses satisfy m + m' >= 0 or m - m' >=
0, respectively. Moreover, in the case of the minus signs, equality holds iff g
and g' are isometric, whereas for the plus signs equality holds iff both (N,g)
and (N,g') are flat Euclidean spaces.
While the proof of the case with the minus signs is rather obvious, the case
with the plus signs requires a subtle extension of Witten's proof of the
standard positive mass theorem. The idea for this extension is due to
Masood-ul-Alam who, in the course of an application, proved the rigidity part m
+ m' = 0 of this theorem, for a special conformal factor. We observe that
Masood-ul-Alam's method extends to the general situation.
|
[{'version': 'v1', 'created': 'Wed, 29 Mar 2000 18:05:13 GMT'}]
|
2007-05-23
|
[array(['Simon', 'Walter', ''], dtype=object)]
|
3,669 |
math-ph/0607061
|
Emmanuel Serie
|
Emmanuel S\'eri\'e (LPT)
|
Noncommutative gauge theories with Endomorphism algebras
|
27 Pages
| null | null |
LPT-Orsay 06-53
|
math-ph hep-th math.MP
| null |
We formulate a Yang-Mills action principle for noncommutative connections on
an endomorphism algebra of a vector bundle. It is shown that there is an
influence of the topology of the vector bundle onto the structure of the
vacuums of the theory in a non common way. This model displays a new kind of
symmetry breaking mechanism. Some mathematical tools are developed in relation
with endomorphism algebras and a new approach of the usual Chern-Weil
homomorphism in topology is given.
|
[{'version': 'v1', 'created': 'Thu, 27 Jul 2006 09:46:45 GMT'}
{'version': 'v2', 'created': 'Wed, 16 Aug 2006 07:37:11 GMT'}]
|
2016-08-16
|
[array(['Sérié', 'Emmanuel', '', 'LPT'], dtype=object)]
|
3,670 |
2108.05869
|
Zhiqiang Hu
|
Zhiqiang Hu, Roy Ka-Wei Lee, Charu C. Aggarwal
|
Syntax Matters! Syntax-Controlled in Text Style Transfer
| null | null | null | null |
cs.CL
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Existing text style transfer (TST) methods rely on style classifiers to
disentangle the text's content and style attributes for text style transfer.
While the style classifier plays a critical role in existing TST methods, there
is no known investigation on its effect on the TST methods. In this paper, we
conduct an empirical study on the limitations of the style classifiers used in
existing TST methods. We demonstrate that the existing style classifiers cannot
learn sentence syntax effectively and ultimately worsen existing TST models'
performance. To address this issue, we propose a novel Syntax-Aware
Controllable Generation (SACG) model, which includes a syntax-aware style
classifier that ensures learned style latent representations effectively
capture the syntax information for TST. Through extensive experiments on two
popular TST tasks, we show that our proposed method significantly outperforms
the state-of-the-art methods. Our case studies have also demonstrated SACG's
ability to generate fluent target-style sentences that preserved the original
content.
|
[{'version': 'v1', 'created': 'Thu, 12 Aug 2021 17:35:23 GMT'}]
|
2021-08-13
|
[array(['Hu', 'Zhiqiang', ''], dtype=object)
array(['Lee', 'Roy Ka-Wei', ''], dtype=object)
array(['Aggarwal', 'Charu C.', ''], dtype=object)]
|
3,671 |
1511.02934
|
Ivan Granito
|
Ivan Granito and Paolo De Angelis
|
Capital allocation and risk appetite under Solvency II framework
| null | null |
10.13140/RG.2.1.1136.8404
| null |
q-fin.RM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The aim of this paper is to introduce a method for computing the allocated
Solvency II Capital Requirement (SCR) of each Risk which the company is exposed
to, taking in account for the diversification effect among different risks. The
method suggested is based on the Euler principle. We show that it has very
suitable properties like coherence in the sense of Denault (2001) and RORAC
compatibility, and practical implications for the companies that use the
standard formula. Further, we show how this approach can be used to evaluate
the underwriting and reinsurance policies and to define a measure of the
Company's risk appetite, based on the capital at risk return.
|
[{'version': 'v1', 'created': 'Mon, 9 Nov 2015 23:46:54 GMT'}]
|
2015-11-11
|
[array(['Granito', 'Ivan', ''], dtype=object)
array(['De Angelis', 'Paolo', ''], dtype=object)]
|
3,672 |
1005.3467
|
Bum Suk Zhao
|
Bum Suk Zhao, Gerard Meijer, and Wieland Sch\"ollkopf
|
Emerging beam resonances in atom diffraction from a reflection grating
|
4 pages, 3 figures
|
Phys. Rev. Lett. 104, 240404 (2010)
|
10.1103/PhysRevLett.104.240404
| null |
physics.atom-ph physics.optics
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report on the observation of emerging beam resonances, well known as
Rayleigh-Wood anomalies and threshold resonances in photon and electron
diffraction, respectively, in an atom-optical diffraction experiment.
Diffraction of He atom beams reflected from a blazed ruled grating at grazing
incidence has been investigated. The total reflectivity of the grating as well
as the intensities of the diffracted beams reveal anomalies at the Rayleigh
angles of incidence, i.e., when another diffracted beam merges parallel to the
grating surface. The observed anomalies are discussed in terms of the classical
wave-optical model of Rayleigh and Fano.
|
[{'version': 'v1', 'created': 'Wed, 19 May 2010 15:06:29 GMT'}]
|
2010-06-24
|
[array(['Zhao', 'Bum Suk', ''], dtype=object)
array(['Meijer', 'Gerard', ''], dtype=object)
array(['Schöllkopf', 'Wieland', ''], dtype=object)]
|
3,673 |
1405.5226
|
Daniele Dorigoni Dr
|
Daniele Dorigoni and David Tong
|
Intersecting Branes, Domain Walls and Superpotentials in 3d Gauge
Theories
|
26 pages, 3 figures, references added
| null |
10.1007/JHEP08(2014)119
| null |
hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We revisit the Hanany-Witten brane construction of 3d gauge theories with N=2
supersymmetry. Instantons are known to generate a superpotential on the Coulomb
branch of the theory. We show that this superpotential can be viewed as arising
from the classical scattering of domain wall solitons. The domain walls live on
the worldvolume of the fivebranes and their existence relies on the recent
observation that the charged hypermultiplet at the intersection of
perpendicular D-branes has non-canonical kinetic terms. We further show how Dp
branes may be absorbed at the intersection of perpendicular D(p+4)-branes where
they appear as BPS sigma-model lumps.
|
[{'version': 'v1', 'created': 'Tue, 20 May 2014 20:01:59 GMT'}
{'version': 'v2', 'created': 'Wed, 4 Jun 2014 09:08:50 GMT'}]
|
2015-06-19
|
[array(['Dorigoni', 'Daniele', ''], dtype=object)
array(['Tong', 'David', ''], dtype=object)]
|
3,674 |
0711.4166
|
Jeffrey Burdges
|
Alexandre Borovik, Jeffrey Burdges and Gregory Cherlin
|
Involutions in groups of finite Morley rank of degenerate type
| null |
Selecta Methematica 13 (2007) 1-22
| null | null |
math.LO
| null |
This article proves a version of the Feit-Thompson theorem for simple groups
of finite Morley rank: a connected groups of finite Morley rank with a finite
Sylow 2-subgroup has a trivial Sylow 2-subgroups.
|
[{'version': 'v1', 'created': 'Tue, 27 Nov 2007 02:03:27 GMT'}]
|
2007-11-28
|
[array(['Borovik', 'Alexandre', ''], dtype=object)
array(['Burdges', 'Jeffrey', ''], dtype=object)
array(['Cherlin', 'Gregory', ''], dtype=object)]
|
3,675 |
2204.09326
|
Attila Jo\'o
|
Zsuzsanna Jank\'o and Attila Jo\'o
|
On generalisations of the Aharoni-Pouzet base exchange theorem
| null | null | null | null |
math.CO
|
http://creativecommons.org/licenses/by/4.0/
|
The Greene-Magnanti theorem states that if $ M $ is a finite matroid, $ B_0 $
and $ B_1 $ are bases and $ B_0=\bigcup_{i=1}^{n} X_i $ is a partition, then
there is a partition $ B_1=\bigcup_{i=1}^{n}Y_i $ such that $ (B_0 \setminus
X_i) \cup Y_i $ is a base for every $ i $. The special case where each $ X_i $
is a singleton can be rephrased as the existence of a perfect matching in the
base transition graph. Pouzet conjectured that this remains true in infinite
dimensional vector spaces. Later he and Aharoni answered this conjecture
affirmatively not just for vector spaces but for infinite matroids.
We prove two generalisations of their result. On the one hand, we show that
`being a singleton' can be relaxed to `being finite' and this is sharp in the
sense the exclusion of infinite sets is really necessary. On the other hand, we
prove that if $ B_0$ and $ B_1 $ are bases, then there is a bijection $ F $
between their finite subsets such that $ (B_0\setminus I) \cup F(I) $ is a base
for every $ I$. In contrast to the approach of Aharoni and Pouzet, our proofs
are completely elementary, they do not rely on infinite matching theory.
|
[{'version': 'v1', 'created': 'Wed, 20 Apr 2022 08:59:00 GMT'}]
|
2022-04-21
|
[array(['Jankó', 'Zsuzsanna', ''], dtype=object)
array(['Joó', 'Attila', ''], dtype=object)]
|
3,676 |
1810.03917
|
Viktor Zivkov
|
Viktor Zivkov (Keele University, ESO), Joana M. Oliveira (Keele
University), Monika G. Petr-Gotzens (ESO), Maria-Rosa L. Cioni (AIP Potsdam),
Stefano Rubele (University of Padova), Jacco Th. van Loon (Keele University),
Kenji Bekki (University of Western Australia), Felice Cusano (INAF -
Osservatorio di Bologna), Richard de Grijs (Macquarie University,
International Space Science Institute - Beijing), Valentin D. Ivanov (ESO),
Marcella Marconi (INAF - Osservatorio di Capodimonte), Florian Niederhofer
(AIP Potsdam), Vincenzo Ripepi (INAF - Osservatorio di Capodimonte),
Ning-Chen Sun (University of Sheffield)
|
The VMC Survey - XXXII. Pre-main sequence populations in the Large
Magellanic Cloud
|
Accepted by A&A, 17 pages, 17 Figures, 3 Tables
|
A&A 620, A143 (2018)
|
10.1051/0004-6361/201833951
| null |
astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Detailed studies of intermediate/low mass pre-main sequence (PMS) stars
outside the Galaxy have so far been conducted only for small targeted regions
harbouring known star formation complexes. The VISTA Survey of the Magellanic
Clouds (VMC) provides an opportunity to study PMS populations down to solar
masses on a galaxy-wide scale. Our goal is to use near-infrared data from the
VMC survey to identify and characterise PMS populations down to ~1 M_sun across
the Magellanic Clouds. We present our colour-magnitude diagram method, and
apply it to a ~1.5 deg^2 pilot field located in the Large Magellanic Cloud. The
pilot field is divided into equally-sized grid elements. We compare the stellar
population in every element with the population in nearby control fields by
creating K_s/(Y-K_s) Hess diagrams; the observed density excesses over the
local field population are used to classify the stellar populations. Our
analysis recovers all known star formation complexes in this pilot field (N44,
N51, N148 and N138) and for the first time reveals their true spatial extent.
In total, around 2260 PMS candidates with ages $\lesssim$ 10 Myr are found in
the pilot field. PMS structures, identified as areas with a significant density
excess of PMS candidates, display a power-law distribution of the number of
members with a slope of -0.86+-0.12. We find a clustering of the young stellar
populations along ridges and filaments where dust emission in the far-infrared
(FIR) (70 micron - 500 micron) is bright. Regions with young populations
lacking massive stars show a lesser degree of clustering and are usually
located in the outskirts of the star formation complexes. At short FIR
wavelengths (70 micron, 100 micron) we report a strong dust emission increase
in regions hosting young massive stars, which is less pronounced in regions
populated only by less massive ($\lesssim$ 4 M_sun) PMS stars.
|
[{'version': 'v1', 'created': 'Tue, 9 Oct 2018 11:23:24 GMT'}]
|
2018-12-12
|
[array(['Zivkov', 'Viktor', '', 'Keele University, ESO'], dtype=object)
array(['Oliveira', 'Joana M.', '', 'Keele\n University'], dtype=object)
array(['Petr-Gotzens', 'Monika G.', '', 'ESO'], dtype=object)
array(['Cioni', 'Maria-Rosa L.', '', 'AIP Potsdam'], dtype=object)
array(['Rubele', 'Stefano', '', 'University of Padova'], dtype=object)
array(['van Loon', 'Jacco Th.', '', 'Keele University'], dtype=object)
array(['Bekki', 'Kenji', '', 'University of Western Australia'],
dtype=object)
array(['Cusano', 'Felice', '', 'INAF -\n Osservatorio di Bologna'],
dtype=object)
array(['de Grijs', 'Richard', '',
'Macquarie University,\n International Space Science Institute - Beijing'],
dtype=object)
array(['Ivanov', 'Valentin D.', '', 'ESO'], dtype=object)
array(['Marconi', 'Marcella', '', 'INAF - Osservatorio di Capodimonte'],
dtype=object)
array(['Niederhofer', 'Florian', '', 'AIP Potsdam'], dtype=object)
array(['Ripepi', 'Vincenzo', '', 'INAF - Osservatorio di Capodimonte'],
dtype=object)
array(['Sun', 'Ning-Chen', '', 'University of Sheffield'], dtype=object)]
|
3,677 |
2211.04269
|
Daniel Romero
|
Daniel Romero, Peter Gerstoft, Hadi Givehchian, Dinesh Bharadia
|
Spoofing Attack Detection in the Physical Layer with Commutative Neural
Networks
| null | null | null | null |
cs.LG cs.CR cs.NI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In a spoofing attack, an attacker impersonates a legitimate user to access or
tamper with data intended for or produced by the legitimate user. In wireless
communication systems, these attacks may be detected by relying on features of
the channel and transmitter radios. In this context, a popular approach is to
exploit the dependence of the received signal strength (RSS) at multiple
receivers or access points with respect to the spatial location of the
transmitter. Existing schemes rely on long-term estimates, which makes it
difficult to distinguish spoofing from movement of a legitimate user. This
limitation is here addressed by means of a deep neural network that implicitly
learns the distribution of pairs of short-term RSS vector estimates. The
adopted network architecture imposes the invariance to permutations of the
input (commutativity) that the decision problem exhibits. The merits of the
proposed algorithm are corroborated on a data set that we collected.
|
[{'version': 'v1', 'created': 'Tue, 8 Nov 2022 14:20:58 GMT'}]
|
2022-11-09
|
[array(['Romero', 'Daniel', ''], dtype=object)
array(['Gerstoft', 'Peter', ''], dtype=object)
array(['Givehchian', 'Hadi', ''], dtype=object)
array(['Bharadia', 'Dinesh', ''], dtype=object)]
|
3,678 |
1412.8406
|
Uri Keshet
|
Uri Keshet and Yossi Naor
|
Compressible flow in front of an axisymmetric blunt object
|
This letter is superseded by a later, more detailed version with a
parameter-free analysis
| null | null | null |
astro-ph.IM physics.flu-dyn
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Compressible flows around blunt objects have diverse applications, but
present analytic treatments are inaccurate and limited to narrow parameter
regimes. We show that the flow in front of an axisymmetric body is accurately
derived analytically using a low order expansion of the perpendicular gradients
in terms of the parallel velocity. This reproduces both subsonic and supersonic
flows measured and simulated for a sphere, including the transonic regime and
the bow shock properties.
|
[{'version': 'v1', 'created': 'Mon, 29 Dec 2014 17:54:27 GMT'}
{'version': 'v2', 'created': 'Fri, 18 Nov 2016 21:32:47 GMT'}]
|
2016-11-22
|
[array(['Keshet', 'Uri', ''], dtype=object)
array(['Naor', 'Yossi', ''], dtype=object)]
|
3,679 |
astro-ph/0611189
|
L. Amati
|
L. Amati
|
Swift GRBs and the Ep,i - Eiso correlation
|
6 pages, 3 figures, Il Nuovo Cimento C, in press (proceedings of
"SWIFT and GRBs: Unveiling the Relativistic Universe", June 5-9, 2006 Venice
(Italy)
|
NuovoCim.B121:1081-1086,2006
|
10.1393/ncb/i2007-10064-9
| null |
astro-ph
| null |
The Ep,i - Eiso correlation is one of the most intriguing and debated
observational evidences in Gamma-Ray Bursts (GRB) astrophysics. Swift, with its
high sensitivity and fast pointing capabilities, is reducing a lot the impact
of selection effects in the sample of GRBs with known redshift (and thus Ep,i
and Eiso). Moreover, in several cases it allows the detection of the soft tail
of the prompt emission, and thus a more accurate estimate of Ep,i with respect
to previous satellites. I present and discuss the location in the Ep,i - Eiso
plane of Swift GRBs with known redshift and estimated Ep,i, showing that all
long events (including peculiar events like GRB060218 and GRB060614) are
consistent with the Ep,i - Eiso correlation. In contrast, short GRBs are not
consistent with it, an evidence further supporting the hypothesis of different
emission mechanisms at work in the two classes of GRBs. I also show, and
briefly discuss, the intriguing evidence that the soft tail of the short
GRB050724 is consistent with the correlation.
|
[{'version': 'v1', 'created': 'Mon, 6 Nov 2006 19:18:54 GMT'}
{'version': 'v2', 'created': 'Mon, 22 Jan 2007 19:24:41 GMT'}]
|
2008-11-26
|
[array(['Amati', 'L.', ''], dtype=object)]
|
3,680 |
1703.00761
|
Yuan Cao
|
Yuan Cao, Yonglin Cao
|
On a class of constacyclic codes over the non-principal ideal ring
$\mathbb{Z}_{p^s}+u\mathbb{Z}_{p^s}$
| null | null | null | null |
cs.IT math.IT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
$(1+pw)$-constacyclic codes of arbitrary length over the non-principal ideal
ring $\mathbb{Z}_{p^s} +u\mathbb{Z}_{p^s}$ are studied, where $p$ is a prime,
$w\in \mathbb{Z}_{p^s}^{\times}$ and $s$ an integer satisfying $s\geq 2$.
First, the structure of any $(1+pw)$-constacyclic code over $\mathbb{Z}_{p^s}
+u\mathbb{Z}_{p^s}$ are presented. Then enumerations for the number of all
codes and the number of codewords in each code, and the structure of dual codes
for these codes are given, respectively. Then self-dual $(1+2w)$-constacyclic
codes over $\mathbb{Z}_{2^s} +u\mathbb{Z}_{2^s}$ are investigated, where
$w=2^{s-2}-1$ or $2^{s-1}-1$ if $s\geq 3$, and $w=1$ if $s=2$.
|
[{'version': 'v1', 'created': 'Thu, 2 Mar 2017 12:34:35 GMT'}]
|
2017-03-03
|
[array(['Cao', 'Yuan', ''], dtype=object)
array(['Cao', 'Yonglin', ''], dtype=object)]
|
3,681 |
1812.00053
|
Rapha\"el Beuzart-Plessis
|
Rapha\"el Beuzart-Plessis
|
Archimedean theory and $\epsilon$-factors for the Asai Rankin-Selberg
integrals
| null | null | null | null |
math.RT math.NT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we partially complete the local Rankin-Selberg theory of Asai
$L$-functions and $\epsilon$-factors as introduced by Flicker and Kable. In
particular, we establish the relevant local functional equation at Archimedean
places and prove the equality between Rankin-Selberg's and Langlands-Shahidi's
$\epsilon$-factors at every place. Our proofs work uniformly for any
characteristic zero local field and use as only input the global functional
equation and a globalization result for a dense subset of tempered
representations that we infer from work of Finis-Lapid-M\"uller. These results
are used in another paper by the author to establish an explicit Plancherel
decomposition for $\mathrm{GL}_n(F)\backslash \mathrm{GL}_n(E)$, $E/F$ a
quadratic extension of local fields, with applications to the Ichino-Ikeda and
formal degree conjecture for unitary groups.
|
[{'version': 'v1', 'created': 'Fri, 30 Nov 2018 20:48:31 GMT'}
{'version': 'v2', 'created': 'Sat, 18 May 2019 15:35:06 GMT'}
{'version': 'v3', 'created': 'Thu, 16 Apr 2020 18:17:04 GMT'}]
|
2020-04-20
|
[array(['Beuzart-Plessis', 'Raphaël', ''], dtype=object)]
|
3,682 |
1410.5591
|
Mathew Thomas Mr.
|
Mathew Thomas Arun, Debajyoti Choudhury, Ashmita Das, Soumitra
SenGupta
|
Graviton modes in multiply warped geometry
|
16 pages, 6 figures
|
Physics Letters B (2015), pp. 266-275
|
10.1016/j.physletb.2015.05.008
| null |
hep-ph hep-ex hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The negative results in the search for Kaluza-Klein graviton modes at the
LHC, when confronted with the discovery of the Higgs, has been construed to
have severely limited the efficacy of the Randall-Sundrum model as an
explanation of the hierarchy problem. We show, though, that the presence of
multiple warping offers a natural resolution of this conundrum through
modifications in both the graviton spectrum and their couplings to the Standard
Model fields.
|
[{'version': 'v1', 'created': 'Tue, 21 Oct 2014 09:39:14 GMT'}
{'version': 'v2', 'created': 'Mon, 18 May 2015 07:01:14 GMT'}]
|
2015-05-19
|
[array(['Arun', 'Mathew Thomas', ''], dtype=object)
array(['Choudhury', 'Debajyoti', ''], dtype=object)
array(['Das', 'Ashmita', ''], dtype=object)
array(['SenGupta', 'Soumitra', ''], dtype=object)]
|
3,683 |
2108.12423
|
Etsuko Itou
|
Keitaro Nagata
|
Finite-density lattice QCD and sign problem: current status and open
problems
|
164pages: Translated from Japanese to English by Masanori Hanada and
Etsuko Itou. This an English translation of a review of finite-density
lattice QCD. The original version in Japanese appeared in Soryushiron Kenkyu
Vol 31 (2020) No. 1
| null |
10.1016/j.ppnp.2022.103991
| null |
hep-lat hep-ph hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This an English translation of a review of finite-density lattice QCD. The
original version in Japanese appeared in Soryushiron Kenkyu Vol 31 (2020) No.
1.
|
[{'version': 'v1', 'created': 'Fri, 27 Aug 2021 00:52:38 GMT'}]
|
2022-10-25
|
[array(['Nagata', 'Keitaro', ''], dtype=object)]
|
3,684 |
2203.16020
|
Kan-Hao Xue
|
Hanli Cui, Shengxin Yang, Jun-Hui Yuan, Li-Heng Li, Fan Ye, Jinhai
Huang, Kan-Hao Xue, and Xiangshui Miao
|
Shell DFT-1/2 method towards engineering accuracy for semiconductors:
GGA versus LDA
|
23 pages, 10 figures
| null | null | null |
cond-mat.mtrl-sci physics.comp-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Kohn-Sham gaps of density functional theory (DFT) obtained in terms of
local density approximation (LDA) or generalized gradient approximation (GGA)
cannot be directly linked to the fundamental gaps of semiconductors, but in
engineering there is a strong demand to match them through certain
rectification methods. Shell DFT-1/2 (shDFT-1/2), as a variant of DFT-1/2, is a
potential candidate to yield much improved band gaps for covalent
semiconductors, but its accuracy depends on the LDA/GGA ground state, including
optimized lattice parameters, basic Kohn-Sham gap before self-energy correction
and the amount of self-energy correction that is specific to the
exchange-correlation (XC) functional. In this work, we test the LDA/GGA as well
as shDFT-1/2 results of six technically important covalent semiconductors Si,
Ge, GaN, GaP, GaAs and GaSb, with an additional ionic insulator LiF for
comparison. The impact of XC flavor (LDA, PBEsol, PBE and RPBE), either
directly on the gap value, or indirectly through the optimized lattice
constant, is examined comprehensively. Moreover, we test the impact of XC
flavor on LDA/GGA and shDFT-1/2 gaps under the condition of fixed experimental
lattice constants. In-depth analysis reveals the rule of reaching the best
accuracy in calculating the electronic band structures of typical covalent
semiconductors. Relevant parameters like lattice constant, self-consistency in
shDFT-1/2 runs, as well as the exchange enhancement factor of GGA, are
discussed in details.
|
[{'version': 'v1', 'created': 'Wed, 30 Mar 2022 02:57:05 GMT'}]
|
2022-03-31
|
[array(['Cui', 'Hanli', ''], dtype=object)
array(['Yang', 'Shengxin', ''], dtype=object)
array(['Yuan', 'Jun-Hui', ''], dtype=object)
array(['Li', 'Li-Heng', ''], dtype=object)
array(['Ye', 'Fan', ''], dtype=object)
array(['Huang', 'Jinhai', ''], dtype=object)
array(['Xue', 'Kan-Hao', ''], dtype=object)
array(['Miao', 'Xiangshui', ''], dtype=object)]
|
3,685 |
2009.05416
|
Tobias Hain
|
Tobias M. Hain, Michael A. Klatt and Gerd E. Schr\"oder-Turk
|
Low-temperature statistical mechanics of the QuanTizer problem: fast
quenching and equilibrium cooling of the three-dimensional Voronoi Liquid
|
11 pages, 6 figures
| null |
10.1063/5.0029301
| null |
cond-mat.soft cond-mat.stat-mech physics.chem-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Quantizer problem is a tessellation optimisation problem where point
configurations are identified such that the Voronoi cells minimise the second
moment of the volume distribution. While the ground state (optimal state) in 3D
is almost certainly the body-centered cubic lattice, disordered and effectively
hyperuniform states with energies very close to the ground state exist that
result as stable states in an evolution through the geometric Lloyd's algorithm
[Klatt et al. Nat. Commun., 10, 811 (2019)]. When considered as a statistical
mechanics problem at finite temperature, the same system has been termed the
'Voronoi Liquid' by [Ruscher et al. EPL 112, 66003 (2015)]. Here we investigate
the cooling behaviour of the Voronoi liquid with a particular view to the
stability of the effectively hyperuniform disordered state. As a confirmation
of the results by Ruscher et al., we observe, by both molecular dynamics and
Monte Carlo simulations, that upon slow quasi-static equilibrium cooling, the
Voronoi liquid crystallises from a disordered configuration into the
body-centered cubic configuration. By contrast, upon sufficiently fast
non-equilibrium cooling (and not just in the limit of a maximally fast quench)
the Voronoi liquid adopts similar states as the effectively hyperuniform
inherent structures identified by Klatt et al. and prevents the ordering
transition into a BCC ordered structure. This result is in line with the
geometric intuition that the geometric Lloyd's algorithm corresponds to a type
of fast quench.
|
[{'version': 'v1', 'created': 'Fri, 11 Sep 2020 13:03:58 GMT'}
{'version': 'v2', 'created': 'Mon, 14 Dec 2020 15:39:32 GMT'}]
|
2020-12-15
|
[array(['Hain', 'Tobias M.', ''], dtype=object)
array(['Klatt', 'Michael A.', ''], dtype=object)
array(['Schröder-Turk', 'Gerd E.', ''], dtype=object)]
|
3,686 |
astro-ph/0212511
|
Milan M. Cirkovic
|
Milan M. Cirkovic
|
The Thermodynamical Arrow of Time: Reinterpreting the Boltzmann-Schuetz
Argument
|
26 pages, "Foundations of Physics" accepted
|
Found.Phys. 33 (2003) 467-490
| null | null |
astro-ph cond-mat.stat-mech physics.hist-ph
| null |
The recent surge of interest in the origin of the temporal asymmetry of
thermodynamical systems (including the accessible part of the universe itself)
put forward two possible explanatory approaches to this age-old problem. Hereby
we show that there is a third possible alternative, based on the generalization
of the classical ("Boltzmann-Schuetz") anthropic fluctuation picture of the
origin of the perceived entropy gradient. This alternative (which we dub the
Acausal-Anthropic approach) is based on accepting Boltzmann's statistical
measure at its face value, and accomodating it within the quantum cosmological
concept of the multiverse. We argue that conventional objections raised against
the Boltzmann-Schuetz view are less forceful and serious than it is usually
assumed. A fortiori, they are incapable of rendering the generalized theory
untenable. On the contrary, this analysis highlights some of the other
advantages of the multiverse approach to the thermodynamical arrow of time.
|
[{'version': 'v1', 'created': 'Sat, 21 Dec 2002 01:04:41 GMT'}]
|
2007-05-23
|
[array(['Cirkovic', 'Milan M.', ''], dtype=object)]
|
3,687 |
nucl-th/0206050
|
S. Karataglidis
|
S. Karataglidis, K. Amos, and B. G. Giraud
|
Local scale transformations and extended matter distributions in nuclei
|
24 pages, 16 figures, RevTex 4
|
Phys.Rev. C71 (2005) 064601
|
10.1103/PhysRevC.71.064601
| null |
nucl-th
| null |
Local scale transformations are made to vary the long range properties of
harmonic oscillator orbitals conventionally used in model structure
calculations of nuclear systems. The transformations ensure that those
oscillator states asymptotically have exponentially decaying forms consistent
with chosen single nucleon binding energies, leaving the structure essentially
unchanged within the body of the nucleus. Application has been made to the
radioactive nuclei 6,8He and 11Li and the resulting wave functions are used to
generate g-folding optical potentials for elastic scattering of those ions from
hydrogen. As a consistency test, application has been made to form wave
functions for 40Ca and they have been used also to specify relevant proton-40Ca
optical potentials with which elastic scattering has been predicted. The need
for appropriate specifications of single particle binding energies in exotic
nuclei is discussed.
|
[{'version': 'v1', 'created': 'Wed, 19 Jun 2002 16:39:43 GMT'}
{'version': 'v2', 'created': 'Mon, 18 Oct 2004 00:56:36 GMT'}]
|
2009-11-07
|
[array(['Karataglidis', 'S.', ''], dtype=object)
array(['Amos', 'K.', ''], dtype=object)
array(['Giraud', 'B. G.', ''], dtype=object)]
|
3,688 |
2202.11961
|
Valentino Servizi
|
Valentino Servizi., Dan R. Persson, Francisco C. Pereira, Hannah
Villadsen, Per B{\ae}kgaard, Inon Peled, Otto A. Nielsen
|
"Is not the truth the truth?": Analyzing the Impact of User Validations
for Bus In/Out Detection in Smartphone-based Surveys
|
22 pages, 11 figures, 4 tables, 3 algorithms
| null | null | null |
cs.HC cs.LG
|
http://creativecommons.org/licenses/by/4.0/
|
Passenger flow allows the study of users' behavior through the public network
and assists in designing new facilities and services. This flow is observed
through interactions between passengers and infrastructure. For this task,
Bluetooth technology and smartphones represent the ideal solution. The latter
component allows users' identification, authentication, and billing, while the
former allows short-range implicit interactions, device-to-device. To assess
the potential of such a use case, we need to verify how robust Bluetooth signal
and related machine learning (ML) classifiers are against the noise of
realistic contexts. Therefore, we model binary passenger states with respect to
a public vehicle, where one can either be-in or be-out (BIBO). The BIBO label
identifies a fundamental building block of continuously-valued passenger flow.
This paper describes the Human-Computer interaction experimental setting in a
semi-controlled environment, which involves: two autonomous vehicles operating
on two routes, serving three bus stops and eighteen users, as well as a
proprietary smartphone-Bluetooth sensing platform. The resulting dataset
includes multiple sensors' measurements of the same event and two ground-truth
levels, the first being validation by participants, the second by three
video-cameras surveilling buses and track. We performed a Monte-Carlo
simulation of labels-flip to emulate human errors in the labeling process, as
is known to happen in smartphone surveys; next we used such flipped labels for
supervised training of ML classifiers. The impact of errors on model
performance bias can be large. Results show ML tolerance to label flips caused
by human or machine errors up to 30%.
|
[{'version': 'v1', 'created': 'Thu, 24 Feb 2022 08:48:40 GMT'}]
|
2022-02-25
|
[array(['Servizi.', 'Valentino', ''], dtype=object)
array(['Persson', 'Dan R.', ''], dtype=object)
array(['Pereira', 'Francisco C.', ''], dtype=object)
array(['Villadsen', 'Hannah', ''], dtype=object)
array(['Bækgaard', 'Per', ''], dtype=object)
array(['Peled', 'Inon', ''], dtype=object)
array(['Nielsen', 'Otto A.', ''], dtype=object)]
|
3,689 |
1811.06767
|
Sheng Xu
|
Sheng Xu, Huan Wang, Xiao-Yan Wang, Yuan Su, Peng Cheng, and Tian-Long
Xia
|
Planar Hall effect in the Dirac semimetal PdTe2
|
4 pages, two column
| null | null | null |
cond-mat.mtrl-sci cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report the synthesis and magneto-transport measurements on the single
crystal of Dirac semimetal PdTe$_2$. The de Haas-van Alphen oscillations with
multiple frequencies have been clearly observed, from which the small effective
masses and nontrivial Berry phase are extracted, implying the possible
existence of the Dirac fermions in PdTe$_2$. The planar Hall effect and
anisotropic longitudinal resistivity originating from the chiral anomaly and
nontrivial Berry phase are observed, providing strong evidence for the
nontrivial properties in PdTe$_2$. With the increase of temperature up to 150
K, planar Hall effect still remains. The possible origin of mismatch between
experimental results and theoretical predictions is also discussed.
|
[{'version': 'v1', 'created': 'Fri, 16 Nov 2018 11:42:06 GMT'}]
|
2018-11-19
|
[array(['Xu', 'Sheng', ''], dtype=object)
array(['Wang', 'Huan', ''], dtype=object)
array(['Wang', 'Xiao-Yan', ''], dtype=object)
array(['Su', 'Yuan', ''], dtype=object)
array(['Cheng', 'Peng', ''], dtype=object)
array(['Xia', 'Tian-Long', ''], dtype=object)]
|
3,690 |
2212.13163
|
Wei Ji
|
Wei Ji, Long Chen, Yinwei Wei, Yiming Wu, Tat-Seng Chua
|
MRTNet: Multi-Resolution Temporal Network for Video Sentence Grounding
|
work in progress
| null | null | null |
cs.CV
|
http://creativecommons.org/licenses/by/4.0/
|
Given an untrimmed video and natural language query, video sentence grounding
aims to localize the target temporal moment in the video. Existing methods
mainly tackle this task by matching and aligning semantics of the descriptive
sentence and video segments on a single temporal resolution, while neglecting
the temporal consistency of video content in different resolutions. In this
work, we propose a novel multi-resolution temporal video sentence grounding
network: MRTNet, which consists of a multi-modal feature encoder, a
Multi-Resolution Temporal (MRT) module, and a predictor module. MRT module is
an encoder-decoder network, and output features in the decoder part are in
conjunction with Transformers to predict the final start and end timestamps.
Particularly, our MRT module is hot-pluggable, which means it can be seamlessly
incorporated into any anchor-free models. Besides, we utilize a hybrid loss to
supervise cross-modal features in MRT module for more accurate grounding in
three scales: frame-level, clip-level and sequence-level. Extensive experiments
on three prevalent datasets have shown the effectiveness of MRTNet.
|
[{'version': 'v1', 'created': 'Mon, 26 Dec 2022 13:48:05 GMT'}
{'version': 'v2', 'created': 'Tue, 27 Dec 2022 05:14:51 GMT'}]
|
2022-12-29
|
[array(['Ji', 'Wei', ''], dtype=object)
array(['Chen', 'Long', ''], dtype=object)
array(['Wei', 'Yinwei', ''], dtype=object)
array(['Wu', 'Yiming', ''], dtype=object)
array(['Chua', 'Tat-Seng', ''], dtype=object)]
|
3,691 |
2006.11433
|
Sander Rhebergen
|
Yunhui He and Sander Rhebergen and Hans De Sterck
|
Local Fourier analysis of multigrid for hybridized and embedded
discontinuous Galerkin methods
| null | null |
10.1137/20M1346985
| null |
math.NA cs.NA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we present a geometric multigrid method with Jacobi and Vanka
relaxation for hybridized and embedded discontinuous Galerkin discretizations
of the Laplacian. We present a local Fourier analysis (LFA) of the two-grid
error-propagation operator and show that the multigrid method applied to an
embedded discontinuous Galerkin (EDG) discretization is almost as efficient as
when applied to a continuous Galerkin discretization. We furthermore show that
multigrid applied to an EDG discretization outperforms multigrid applied to a
hybridized discontinuous Galerkin (HDG) discretization. Numerical examples
verify our LFA predictions.
|
[{'version': 'v1', 'created': 'Fri, 19 Jun 2020 23:11:03 GMT'}]
|
2023-07-07
|
[array(['He', 'Yunhui', ''], dtype=object)
array(['Rhebergen', 'Sander', ''], dtype=object)
array(['De Sterck', 'Hans', ''], dtype=object)]
|
3,692 |
2306.04334
|
Alessandro Scir\`e
|
Alessandro Scir\`e, Simone Conia, Simone Ciciliano, Roberto Navigli
|
Echoes from Alexandria: A Large Resource for Multilingual Book
Summarization
|
9 pages, long paper at ACL 2023
| null | null | null |
cs.CL
|
http://creativecommons.org/licenses/by/4.0/
|
In recent years, research in text summarization has mainly focused on the
news domain, where texts are typically short and have strong layout features.
The task of full-book summarization presents additional challenges which are
hard to tackle with current resources, due to their limited size and
availability in English only. To overcome these limitations, we present "Echoes
from Alexandria", or in shortened form, "Echoes", a large resource for
multilingual book summarization. Echoes features three novel datasets: i)
Echo-Wiki, for multilingual book summarization, ii) Echo-XSum, for
extremely-compressive multilingual book summarization, and iii) Echo-FairySum,
for extractive book summarization. To the best of our knowledge, Echoes, with
its thousands of books and summaries, is the largest resource, and the first to
be multilingual, featuring 5 languages and 25 language pairs. In addition to
Echoes, we also introduce a new extractive-then-abstractive baseline, and,
supported by our experimental results and manual analysis of the summaries
generated, we argue that this baseline is more suitable for book summarization
than purely-abstractive approaches. We release our resource and software at
https://github.com/Babelscape/echoes-from-alexandria in the hope of fostering
innovative research in multilingual book summarization.
|
[{'version': 'v1', 'created': 'Wed, 7 Jun 2023 11:01:39 GMT'}]
|
2023-06-08
|
[array(['Scirè', 'Alessandro', ''], dtype=object)
array(['Conia', 'Simone', ''], dtype=object)
array(['Ciciliano', 'Simone', ''], dtype=object)
array(['Navigli', 'Roberto', ''], dtype=object)]
|
3,693 |
1802.00065
|
Sergio Ciuchi
|
Sergio Ciuchi, Domenico Di Sante, Vladimir Dobrosavljevi\'c, Simone
Fratini
|
The origin of Mooij correlations in disordered metals
| null |
npj Quantum Materials 3, 44 (2018)
|
10.1038/s41535-018-0119-y
| null |
cond-mat.str-el
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Sufficiently disordered metals display systematic deviations from the
behavior predicted by semi-classical Boltzmann transport theory. Here the
scattering events from impurities or thermal excitations can no longer be
considered as additive independent processes, as asserted by Matthiessen's rule
following from this picture. In the intermediate region between the regime of
good conduction and that of insulation, one typically finds a change of sign of
the temperature coefficient of resistivity (TCR), even at elevated temperature
spanning ambient conditions, a phenomenology that was first identified by Mooij
in 1973. Traditional weak coupling approaches to identify relevant corrections
to the Boltzmann picture focused on long distance interference effects such as
"weak localization", which are especially important in low dimensions (1D, 2D)
and close to the zero temperature limit. Here we formulate a strong-coupling
approach to tackle the interplay of strong disorder and lattice deformations
(phonons) in bulk three-dimensional metals at high temperatures. We identify a
polaronic mechanism of strong disorder renormalization, which describes how a
lattice locally responds to the relevant impurity potential. This mechanism,
which quantitatively captures the Mooij regime, is physically distinct and
unrelated to Anderson localization, but realizes early seminal ideas of
Anderson himself, concerning the interplay of disorder and lattice
deformations.
|
[{'version': 'v1', 'created': 'Wed, 31 Jan 2018 21:01:21 GMT'}
{'version': 'v2', 'created': 'Tue, 20 Feb 2018 15:28:02 GMT'}
{'version': 'v3', 'created': 'Fri, 15 Jun 2018 13:58:10 GMT'}
{'version': 'v4', 'created': 'Wed, 12 Sep 2018 09:04:04 GMT'}]
|
2019-05-09
|
[array(['Ciuchi', 'Sergio', ''], dtype=object)
array(['Di Sante', 'Domenico', ''], dtype=object)
array(['Dobrosavljević', 'Vladimir', ''], dtype=object)
array(['Fratini', 'Simone', ''], dtype=object)]
|
3,694 |
2305.14260
|
Yue Fan
|
Yue Fan, Kaizhi Zheng, Jing Gu, Xin Eric Wang
|
R2H: Building Multimodal Navigation Helpers that Respond to Help
| null | null | null | null |
cs.CL
|
http://creativecommons.org/licenses/by/4.0/
|
The ability to assist humans during a navigation task in a supportive role is
crucial for intelligent agents. Such agents, equipped with environment
knowledge and conversational abilities, can guide individuals through
unfamiliar terrains by generating natural language responses to their
inquiries, grounded in the visual information of their surroundings. However,
these multimodal conversational navigation helpers are still underdeveloped.
This paper proposes a new benchmark, Respond to Help (R2H), to build multimodal
navigation helpers that can respond to help, based on existing dialog-based
embodied datasets. R2H mainly includes two tasks: (1) Respond to Dialog History
(RDH), which assesses the helper agent's ability to generate informative
responses based on a given dialog history, and (2) Respond during Interaction
(RdI), which evaluates the helper agent's ability to maintain effective and
consistent cooperation with a task performer agent during navigation in
real-time. Furthermore, we propose a novel task-oriented multimodal response
generation model that can see and respond, named SeeRee, as the navigation
helper to guide the task performer in embodied tasks. Through both automatic
and human evaluations, we show that SeeRee produces more effective and
informative responses than baseline methods in assisting the task performer
with different navigation tasks. Project website:
https://sites.google.com/view/respond2help/home.
|
[{'version': 'v1', 'created': 'Tue, 23 May 2023 17:12:09 GMT'}]
|
2023-05-24
|
[array(['Fan', 'Yue', ''], dtype=object)
array(['Zheng', 'Kaizhi', ''], dtype=object)
array(['Gu', 'Jing', ''], dtype=object)
array(['Wang', 'Xin Eric', ''], dtype=object)]
|
3,695 |
2208.01015
|
Piotr Bozek
|
Piotr Bozek and Rupam Samanta
|
Probing flow fluctuations through factorization breaking of harmonic
flows in heavy-ion collisions
|
Presented by R. Samanta at Quark Matter 2022 : XXIXth International
Conference on Ultra-relativistic Nucleus-Nucleus Collisions
| null | null | null |
nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
We study factorization-breaking coefficients between the momentum dependent
and momentum averaged flow vectors to probe flow fluctuations caused by
initial-state fluctuations in heavy-ion collision. The coefficients for the
flow vector squared and flow magnitude squared could be used for the extraction
of flow angle decorrelations. We compare our model results with preliminary
experimental data. We also present the predictions for the momentum dependent
correlation between mixed flow harmonics.
|
[{'version': 'v1', 'created': 'Mon, 1 Aug 2022 17:45:50 GMT'}]
|
2022-08-02
|
[array(['Bozek', 'Piotr', ''], dtype=object)
array(['Samanta', 'Rupam', ''], dtype=object)]
|
3,696 |
1711.00650
|
Haibin Wu
|
Shujin Deng, Aur\'elia Chenu, Pengpeng Diao, Fang Li, Shi Yu, Ivan
Coulamy, Adolfo del Campo, and Haibin Wu
|
Superadiabatic quantum friction suppression in finite-time
thermodynamics
|
13 pages, 9 figures
|
Science Advances 4, eaar5909 (2018)
|
10.1126/sciadv.aar5909
| null |
cond-mat.quant-gas physics.atom-ph quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Optimal performance of thermal machines is reached by suppressing friction.
Friction in quantum thermodynamics results from fast driving schemes that
generate nonadiabatic excitations. The far-from-equilibrium dynamics of quantum
devices can be tailored by shortcuts to adiabaticity to suppress quantum
friction. We experimentally demonstrate friction-free superadiabatic strokes
with a trapped unitary Fermi gas as a working substance and establish the
equivalence between the superadiabatic mean work and its adiabatic value.
|
[{'version': 'v1', 'created': 'Thu, 2 Nov 2017 08:50:23 GMT'}]
|
2018-05-01
|
[array(['Deng', 'Shujin', ''], dtype=object)
array(['Chenu', 'Aurélia', ''], dtype=object)
array(['Diao', 'Pengpeng', ''], dtype=object)
array(['Li', 'Fang', ''], dtype=object)
array(['Yu', 'Shi', ''], dtype=object)
array(['Coulamy', 'Ivan', ''], dtype=object)
array(['del Campo', 'Adolfo', ''], dtype=object)
array(['Wu', 'Haibin', ''], dtype=object)]
|
3,697 |
2307.00051
|
Qingling Ni
|
Q. Ni, J. Aird, A. Merloni, K. L. Birchall, J. Buchner, M. Salvato, G.
Yang
|
The incidence of AGN in galaxies with different stellar population ages
|
24 pages, 28 figures. Accepted for publication in MNRAS
| null | null | null |
astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It has been argued that recycled gas from stellar mass loss in galaxies might
serve as an important fuelling source for black holes (BHs) in their centers.
Utilizing spectroscopic samples of galaxies from the Sloan Digital Sky Survey
(SDSS) at $z = 0-0.35$ and the Large Early Galaxy Astrophysics Census (LEGA-C)
survey at $z = 0.6-1$ that have X-ray coverage from XMM-Newton or Chandra, we
test this stellar mass loss fuelling scenario by investigating how AGN activity
and BH growth vary with the break strength at 4000 $\r{A}$, $\rm D_{n}4000$
(which is closely related to the age of stellar populations), as younger
galaxies are considered to have higher stellar mass loss rates. We found that
when controlling for host-galaxy properties, the fraction of log $L_{\rm
X}$/$M_\star$ > 32 (which roughly corresponds to Eddington ratios $\gtrsim 1$%)
AGN and sample-averaged black hole accretion rate ($\rm \overline{BHAR}$)
decrease with $\rm D_{n}4000$ among $\rm D_{n}4000$ $\lesssim$ 1.9 galaxies,
suggesting a higher level of AGN activity among younger galaxies, which
supports the stellar mass loss fuelling scenario. For the oldest and most
massive galaxies at $z = 0-0.35$, this decreasing trend is not present anymore.
We found that, among these most massive galaxies at low redshift, the fraction
of low specific-accretion-rate (31 $<$ log $L_{\rm X}$/$M_\star$ $<$ 32) AGNs
increases with $\rm D_{n}4000$, which may be associated with additional
fuelling from hot halo gas and/or enhanced accretion capability.
|
[{'version': 'v1', 'created': 'Fri, 30 Jun 2023 18:00:04 GMT'}]
|
2023-07-04
|
[array(['Ni', 'Q.', ''], dtype=object)
array(['Aird', 'J.', ''], dtype=object)
array(['Merloni', 'A.', ''], dtype=object)
array(['Birchall', 'K. L.', ''], dtype=object)
array(['Buchner', 'J.', ''], dtype=object)
array(['Salvato', 'M.', ''], dtype=object)
array(['Yang', 'G.', ''], dtype=object)]
|
3,698 |
1805.00678
|
Iwo Bialynicki-Birula
|
Iwo Bialynicki-Birula and Zofia Bialynicka-Birula
|
Quantum numbers and spectra of structured light
|
Submitted to the special issue of Physica Scripta in honor of
Wolfgang Schleich
|
Physica Scripta 93, 104005 (2018)
|
10.1088/1402-4896/aadbfe
| null |
physics.optics
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It is shown that the description of light beams in terms of the corresponding
photon quantum numbers elucidates the properties of these beams. In particular,
this description shows that the helicity quantum number plays the fundamental
role. This mode of description is applied to twisted and knotted
electromagnetic waves. We concentrate on the cases where photon wave functions
are eigenfunctions of one component of angular momentum. We discovered that for
knotted waves the eigenvalue of the angular momentum determines the topology of
knots.
|
[{'version': 'v1', 'created': 'Wed, 2 May 2018 08:48:49 GMT'}
{'version': 'v2', 'created': 'Tue, 21 Aug 2018 16:04:58 GMT'}]
|
2018-09-26
|
[array(['Bialynicki-Birula', 'Iwo', ''], dtype=object)
array(['Bialynicka-Birula', 'Zofia', ''], dtype=object)]
|
3,699 |
0806.4670
|
Marc Henneaux
|
Marc Henneaux
|
Kac-Moody algebras and the structure of cosmological singularities: a
new light on the Belinskii-Khalatnikov-Lifshitz analysis
|
Dedicated to Claudio Bunster on the occasion of his 60th birthday. To
appear in ``Quantum Mechanics of Fundamental Systems: The Quest for Beauty
and Simplicity - Claudio Bunster Festsschrift" - 15 pages - PdfLaTeX
| null | null | null |
hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The unexpected and fascinating emergence of hyperbolic Coxeter groups and
Lorentzian Kac-Moody algebras in the investigation of gravitational theories in
the vicinity of a cosmological singularity is briefly reviewed. Some open
questions raised by this intriguing result, and some attempts to answer them,
are outlined.
|
[{'version': 'v1', 'created': 'Sat, 28 Jun 2008 07:53:09 GMT'}]
|
2008-07-01
|
[array(['Henneaux', 'Marc', ''], dtype=object)]
|
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