26 research outputs found
Understanding Co-evolution in Large Multi-relational Social Networks
Understanding dynamics of evolution in large social networks is an important
problem. In this paper, we characterize evolution in large multi-relational
social networks. The proliferation of online media such as Twitter, Facebook,
Orkut and MMORPGs\footnote{Massively Multi-player Online Role Playing Games}
have created social networking data at an unprecedented scale. Sony's Everquest
2 is one such example. We used game multi-relational networks to reveal the
dynamics of evolution in a multi-relational setting by macroscopic study of the
game network. Macroscopic analysis involves fragmenting the network into
smaller portions for studying the dynamics within these sub-networks, referred
to as `communities'. From an evolutionary perspective of multi-relational
network analysis, we have made the following contributions. Specifically, we
formulated and analyzed various metrics to capture evolutionary properties of
networks. We find that co-evolution rates in trust based `communities' are
approximately higher than the trade based `communities'. We also find
that the trust and trade connections within the `communities' reduce as their
size increases. Finally, we study the interrelation between the dynamics of
trade and trust within `communities' and find interesting results about the
precursor relationship between the trade and the trust dynamics within the
`communities'
Dynamics of Trust Reciprocation in Heterogenous MMOG Networks
Understanding the dynamics of reciprocation is of great interest in sociology
and computational social science. The recent growth of Massively Multi-player
Online Games (MMOGs) has provided unprecedented access to large-scale data
which enables us to study such complex human behavior in a more systematic
manner. In this paper, we consider three different networks in the EverQuest2
game: chat, trade, and trust. The chat network has the highest level of
reciprocation (33%) because there are essentially no barriers to it. The trade
network has a lower rate of reciprocation (27%) because it has the obvious
barrier of requiring more goods or money for exchange; morever, there is no
clear benefit to returning a trade link except in terms of social connections.
The trust network has the lowest reciprocation (14%) because this equates to
sharing certain within-game assets such as weapons, and so there is a high
barrier for such connections because they require faith in the players that are
granted such high access. In general, we observe that reciprocation rate is
inversely related to the barrier level in these networks. We also note that
reciprocation has connections across the heterogeneous networks. Our
experiments indicate that players make use of the medium-barrier reciprocations
to strengthen a relationship. We hypothesize that lower-barrier interactions
are an important component to predicting higher-barrier ones. We verify our
hypothesis using predictive models for trust reciprocations using features from
trade interactions. Using the number of trades (both before and after the
initial trust link) boosts our ability to predict if the trust will be
reciprocated up to 11% with respect to the AUC
Daksha: On Alert for High Energy Transients
We present Daksha, a proposed high energy transients mission for the study of
electromagnetic counterparts of gravitational wave sources, and gamma ray
bursts. Daksha will comprise of two satellites in low earth equatorial orbits,
on opposite sides of earth. Each satellite will carry three types of detectors
to cover the entire sky in an energy range from 1 keV to >1 MeV. Any transients
detected on-board will be announced publicly within minutes of discovery. All
photon data will be downloaded in ground station passes to obtain source
positions, spectra, and light curves. In addition, Daksha will address a wide
range of science cases including monitoring X-ray pulsars, studies of
magnetars, solar flares, searches for fast radio burst counterparts, routine
monitoring of bright persistent high energy sources, terrestrial gamma-ray
flashes, and probing primordial black hole abundances through lensing. In this
paper, we discuss the technical capabilities of Daksha, while the detailed
science case is discussed in a separate paper.Comment: 9 pages, 3 figures, 1 table. Additional information about the mission
is available at https://www.dakshasat.in
Science with the Daksha High Energy Transients Mission
We present the science case for the proposed Daksha high energy transients
mission. Daksha will comprise of two satellites covering the entire sky from
1~keV to ~MeV. The primary objectives of the mission are to discover and
characterize electromagnetic counterparts to gravitational wave source; and to
study Gamma Ray Bursts (GRBs). Daksha is a versatile all-sky monitor that can
address a wide variety of science cases. With its broadband spectral response,
high sensitivity, and continuous all-sky coverage, it will discover fainter and
rarer sources than any other existing or proposed mission. Daksha can make key
strides in GRB research with polarization studies, prompt soft spectroscopy,
and fine time-resolved spectral studies. Daksha will provide continuous
monitoring of X-ray pulsars. It will detect magnetar outbursts and high energy
counterparts to Fast Radio Bursts. Using Earth occultation to measure source
fluxes, the two satellites together will obtain daily flux measurements of
bright hard X-ray sources including active galactic nuclei, X-ray binaries, and
slow transients like Novae. Correlation studies between the two satellites can
be used to probe primordial black holes through lensing. Daksha will have a set
of detectors continuously pointing towards the Sun, providing excellent hard
X-ray monitoring data. Closer to home, the high sensitivity and time resolution
of Daksha can be leveraged for the characterization of Terrestrial Gamma-ray
Flashes.Comment: 19 pages, 7 figures. Submitted to ApJ. More details about the mission
at https://www.dakshasat.in
Integration of condor with CASE
Simulation modeling requires massive amount of computing power to run thousands/millions of simulations. To acquire this massive amount of computing power, one has to own the infrastructure: a cluster/grid of many cheap computers or an expensive supercomputer.
Using a grid of cheap computers over one super computer is preferred because it eliminates the single point of failure, increases scalability by adding another cheap computer to the grid as and when required, and is much more efficient in terms of fault tolerance. With the help of Condor, open source software for high throughput computing, a cluster of computers can be easily established.
This project implements a robust Condor pool in the Parallel and Distributed computing Centre (PDCC) in Nanyang Technological University to help parallelize the simulations on the pool to save time.
Experiments were performed with various methods to parallelize the given software, complex adaptive system evolver (CASE) to find the best possible method given the constraints.Bachelor of Engineering (Computer Engineering