659 research outputs found
Dynamics of Network Formation Processes in the Co-Author Model
No full textThis article studies the dynamics in the formation processes of a mutual consent network in game theory setting: the Co-Author Model. In this article, a limited observation is applied and analytical results are derived. Then, 2 parameters are varied: the number of individuals in the network and the initial probability of the links in the network in its initial state. A simulation result shows a finding that is consistent with an analytical result for a state of equilibrium while it also shows different possible equilibria.Dynamics, Network, Game Theory, Model,Simulation, Equilibrium, Complexity
RCSB Protein Data Bank: A Resource for Chemical, Biochemical, and Structural Explorations of Large and Small Biomolecules
No full textThe Research Collaboratory for Structural Bioinformatics (RCSB) Protein Data Bank (PDB) supports scientific research and education worldwide by providing access to annotated information about three-dimensional (3D) structures of macromolecules (e.g., nucleic acids, proteins), and associated small molecules (e.g., drugs, cofactors, inhibitors) in the PDB archive. Researchers, educators, and students use RCSB PDB resources to study the shape and interactions of biological molecules and their implications in molecular biology, medicine, biotechnology, and beyond. RCSB PDB supports development of standards for data deposition, representation, annotation, and validation of atomic structural data obtained from various experimental methods. Uniform representation of PDB data is essential for providing consistent search and analysis capabilities for all PDB users, from beginning students to domain experts. The RCSB PDB Web site provides tools for searching, visualizing, and analyzing PDB data, including easy exploration of chemical interactions that stabilize macromolecules and play important roles in their interactions and functions. In addition, educational resources are available for free and unrestricted use in the classroom for exploring chemistry and biology at the molecular level.This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Chemical Education, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://dx.doi.org/10.1021/acs.jchemed.5b00404Peer reviewe
Shear sum rule in higher derivative gravity theories
No full textWe study holographic shear sum rules in Einstein gravity with curvature squared corrections. Sum rules relate weighted integral over spectral densities of retarded correlators in the shear channel to the one point functions of the CFTs. The proportionality constant can be written in terms of the data of three point functions of the stress tensors of the CFT (t(2) and t(4)). For CFTs dual to two derivative Einstein gravity, this proportionality constant is just d/2(d + 1). This has been verified by a direct holographic computation of the retarded correlator for Einstein gravity in AdS(d+1) black hole background. We compute corrections to the holographic shear sum rule in presence of higher derivative corrections to the Einstein-Hilbert action. We find agreement between the sum rule obtained from a general CFT analysis and holographic computation for Gauss Bonnet theories in AdS(5) black hole background. We then generalize the sum rule for arbitrary curvature squared corrections to Einstein-Hilbert action in d >= 4. Evaluating the parameters t(2) and t(4) for the possible dual CFT in presence of such curvature corrections, we find an agreement with the general field theory derivation to leading order in coupling constants of the higher derivative terms
A Review Of Research By Soumitra Dutta Titled “Strategies For Implementing Knowledgebased Systems”
No full textThe management of organizational knowledge, a relatively new and challenging concept for most organizations, is introduced and discussed in this paper. Around this general topic, the author, Dr. Dutta conducted a series of important concepts from knowledge, organizational knowledge or organizational knowledge assets, Knowledge-Based Systems (KBS’s), to implementation strategies for KBS’s. There is an increasing consensus that the effective management of knowledge is an important basis of competitive advantage for corporations, and that KBS’s can have an important role in the management of organizational knowledge at all levels. Based on an understanding that with considerable progress in the underlying technologies, the major challenges in the implementation of KBS’s have evolved from technical matters and to organizational and strategic issues, Dr. Dutta proposed four different strategies ( guided, specialist, dispersed points, and dispersed clusters) and described them in relation to the different levels of organizational knowledge and the locus of responsibility for the development of KBS’s. Then, the technical, managerial and strategic implications of each of the four strategies have been discussed
Applications of balance optimization subset selection
No full textBalance Optimization Subset Selection (BOSS) is a framework designed to be used for causal inference on observational data. The theoretical foundation for the BOSS framework has been provided in the literature; this thesis aims to provide some examples of the practical value of BOSS by using it on two problems. The first application is using BOSS to determine a subset of users who would be suitable targets for marketing efforts, and the second application is using BOSS to identify potential first-round upsets in the NCAA basketball tournament. Finally, this thesis delves into another area of college basketball and attempts to model the process of the NCAA tournament selection committee using a decision tree.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2018-08-01The student, Shouvik Dutta, accepted the attached license on 2016-07-19 at 12:51.The student, Shouvik Dutta, submitted this Thesis for approval on 2016-07-19 at 12:54.This Thesis was approved for publication on 2016-07-21 at 14:08.DSpace SAF Submission Ingestion Package generated from Vireo submission #10013 on 2016-11-10 at 12:21:00Made available in DSpace on 2016-11-10T18:27:07Z (GMT). No. of bitstreams: 2
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Similarities between 2D and 3D convection for large Prandtl number
No full textUsing direct numerical simulations of Rayleigh-B\'enard convection (RBC), we perform a comparative study of the spectra and fluxes of energy and entropy for large and infinite Prandtl numbers in two (2D) and three (3D) dimensions. We observe close similarities between the 2D and 3D RBC, in particular the kinetic energy spectrum , and the entropy spectrum exhibits a dual branch with a dominant spectrum. We showed that the dominant Fourier modes in the 2D and 3D flows are very close
Energy-based Reference-Free Damage Diagnosis using A Single Pair of Collocated PZTs
No full textThis research is supported by the Radiation Technology Program (M20703000015-07N0300-01510) under Korea Science and Engineering Foundation (KOSEF) and U-Eco city project (C007L7510001-08L015800110) under Korea Institute of Construction & Transportation technology Evaluation and Planning (KICTEP). Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the funding agencies
The Political Economy of the Corporation: Sahil Jai Duta Interviews Sandy Brian Hager
No full textPERC’s Sahil Jai Dutta is joined by Dr Sandy Brian Hager (City, University of London) to discuss the political economy of the corporation. He is the author of the book Public Debt, Inequality, and Power: The Making of a Modern Debt State (2016) published by University of California Press. The conversation spans across the topics of ownership and the politics of public debt, the power of large banks in the US, and his most recent work exploring what drives long-term shifts in the stock markets in the ‘advanced’ economies
The Political Economy of the Corporation: Sahil Jai Duta Interviews Sandy Brian Hager
No full textPERC’s Sahil Jai Dutta is joined by Dr Sandy Brian Hager (City, University of London) to discuss the political economy of the corporation. He is the author of the book Public Debt, Inequality, and Power: The Making of a Modern Debt State (2016) published by University of California Press. The conversation spans across the topics of ownership and the politics of public debt, the power of large banks in the US, and his most recent work exploring what drives long-term shifts in the stock markets in the ‘advanced’ economies
Aspects of conformal field theories at finite temperature
No full textIn this thesis we have studied broadly two aspects of thermal field theory. We began by examining how
the macroscopic system (described by relativistic hydrodynamics) behalves in presence of microscopic
anomalies. We are able to relate macroscopic transport coefficients to the anomalous conservation equations
of the microscopic theory. It is to be noted that, using the perturbative methods that we develop,
we are able to relate both the mixed and pure gravitational anomalies to their respective transport coe
fficients. Our results agree with other methods used to study this relationship. Using our perturbative
approach, we are also able to understand the breakdown of the replacement rule for gravitino systems.
Global anomalies instead of perturbative anomalies can also be used to x the macroscopic transport
coefficients. By computing the global anomalies associated with particular systems, we were able to
write down thermal effective actions which reproduce the anomalies. We show that such effective actions
can be used to compute the transport coefficients and obtain a match with our perturbative results. We
also provide a topological understanding of the replacement rule. As a further check of our formalism,
we compute perturbatively using the formalism developed in [11], the anomalous transport coefficient
(corresponding to pure gravitational anomaly) for self dual tensors in d = 6 and obtain a match with
the global anomaly result.
In the second part of the thesis we look at constraints that can be placed on spectral densities in
a conformal field theory at fi nite temperature. Sum rules provide important constraints on spectral
densities of any quantum field theory. We relate the weighted integral of spectral densities over frequency
to the energy density of the theory. We show that the proportionality constant can be written down
in terms of Hofman-Maldacena variables t2 and t4, which determine the three point function of stress
tensors of a parity preserving CFT. For CFTs dual to two derivative Einstein gravity, we nd agreement
of our sum rule derived from general conformal invariance with holographic methods. We also obtain
correction to the holographic shear sum rule for theories with quadratic curvature corrections to the
Einstein gravity.
We extend the conformal collider physics formalism developed by Maldacena et al to study three point
functions involving a stress tensor T, a U(1) current j, in 2 + 1 dimensional parity violating conformal
field theories. We show that large N Chern Simons theories coupled to fundamental fermions/ bosons
saturate our derived bounds. This is consistent with the observations that the scaling dimensions of spin
operators in these theories saturate the unitarity bound ( s s + 1) and hence perhaps the conformal
collider bounds as well
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