Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Attention Dynamics in Collaborative Knowledge Creation   To uncover the mechanisms underlying the collaborative production of
knowledge, we investigate a very large online Question and Answer system that
includes the question asking and answering activities of millions of users over
five years. We created knowledge networks in which nodes are questions and
edges are the successive answering activities of users. We find that these
networks have two common properties: 1) the mitigation of degree inequality
among nodes; and 2) the assortative mixing of nodes. This means that, while the
system tends to reduce attention investment on old questions in order to supply
sufficient attention to new questions, it is not easy for novel knowledge be
integrated into the existing body of knowledge. We propose a mixing model to
combine preferential attachment and reversed preferential attachment processes
to model the evolution of knowledge networks and successfully reproduce the ob-
served patterns. Our mixing model is not only theoretically interesting but
also provide insights into the management of online communities.

31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th