Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Empirical study on social groups in pedestrian evacuation dynamics   Pedestrian crowds often include social groups, i.e. pedestrians that walk
together because of social relationships. They show characteristic
configurations and influence the dynamics of the entire crowd. In order to
investigate the impact of social groups on evacuations we performed an
empirical study with pupils. Several evacuation runs with groups of different
sizes and different interactions were performed. New group parameters are
introduced which allow to describe the dynamics of the groups and the
configuration of the group members quantitatively. The analysis shows a
possible decrease of evacuation times for large groups due to self-ordering
effects. Social groups can be approximated as ellipses that orientate along
their direction of motion. Furthermore, explicitly cooperative behaviour among
group members leads to a stronger aggregation of group members and an
intermittent way of evacuation.

4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess