Birds, sh, and many other animals travel as a ock, school, or herd. Animals in these groups must remain in close proximity while avoiding collisions with neighbors and with obstacles. We would like to reproduce this behavior for groups of arti cial creatures with signi cant dynamics. In this paper we describe an algorithm for creatures that move as a group and evaluate the performance of the al...

One of the best known methods in social network analysis and research in group dynamics is the use of so called socio matrices or Moreno matrices (Moreno 1934; Freeman 1989). A socio matrix represents relations between the different group members, e.g., positive and negative attitudes or the frequency of social interactions. Given a group of three members A,B and C for example, then a socio mat...

A range of online learning environments now offers asynchronous discussion groups to facilitate student interaction with teachers and peers. Features, such as anonymity and delegated leadership offer new possibilities for learning processes. Few teachers and students are prepared for the processes that arise when the temporal dynamic and status relationships of the classroom are changed. Some b...

Leeches exploring a new environment continuously meet each other and merge in temporary groups. After 2-3 h, leeches become attracted to each other eventually forming a large and stable group. When their number is reduced, leeches remain solitary, behaving independently. Group formation is facilitated by body injection of serotonin (5-HT) and the level of endogenous 5-HT is elevated in leeches ...

Temporal online content becomes the zeitgeist to reflect our interests and changes. Active users are essential participants and promoters behind it. Temporal dynamics becomes a viable way to investigate users. However, most current work only use global temporal trend and fail to distinguish such fine-grained patterns across groups. Different users have diverse interest and exhibit distinct beha...

Comparing the gravitational acceleration induced on the Local Group of galaxies by different tracers of the underline density field we estimate, within the linear gravitational instability theory and the linear biasing ansatz, their relative bias factors. Using optical SSRS2 galaxies, IRAS (PSCz) galaxies and Abell/ACO clusters, we find bO,I ≈ 1.21 ± 0.06 and bC,I ≈ 4.3 ± 0.8, in agreement with...