Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Pattern Recognition Approach To Secure Cipher Documents   Natural phenomena show that many creatures form large social groups and move
in regular patterns. Previous In this paper, we first propose an efficient
distributed mining algorithm to jointly identify a group of moving objects and
discover their movement patterns in wireless sensor networks. Afterward, we
propose a compression algorithm, called 2P2D, which exploits the obtained group
movement patterns to reduce the amount of delivered data. The compression
algorithm includes a sequence merge and an entropy reduction phases. we
formulate a Hit Item Replacement (HIR) problem and propose a Replace algorithm
that obtains the optimal solution. Moreover, we devise three replacement rules
and derive the maximum compression ratio.

12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin