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Are we as a society getting more polarized, and if so, why? We try to answer this question through a model of opinion formation. Empirical studies have shown that homophily results in polarization. However, we show that DeGroot's well-known model of opinion formation based on repeated averaging can never be polarizing, even if individuals are arbitrarily(More)
Credit networks represent a way of modeling trust between entities in a network. Nodes in the network print their own currency and trust each other for a certain amount of each other's currency. This allows the network to serve as a decentralized payment infrastructure---arbitrary payments can be routed through the network by passing IOUs between trusting(More)
Credit networks are an abstraction for modeling trust among agents in a network. Agents who do not directly trust each other can transact through exchange of IOUs (obligations) along a chain of trust in the network. Credit networks are robust to intrusion, can enable transactions between strangers in exchange economies, and have the liquidity to support a(More)
We study a market for private data in which a data analyst publicly releases a statistic over a database of private information. Individuals that own the data incur a cost for their loss of privacy proportional to the differential privacy guarantee given by the analyst at the time of the release. The analyst incentivizes individuals by compensating them,(More)
Trust Networks are a specific kind of social network where edges in the network have positive and negative signs connoting friend-ship/trust and antagonism/distrust respectively. While the last few years have seen a rich body of work on generative models for social networks, there hasn't been much work on understanding in what ways trust networks differ(More)
PURPOSE Optical Surface Monitoring system (OSMS) have been recently introduced by Varian for initial patient positioning and real-time monitoring during complex radiotherapy treatment. The purpose of this work was to implement TG 147 with OSMS. METHODS Recently we installed OSMS first of its kind in India on trueBEAM STx at our Institue. The OSMS is(More)
PURPOSE Quality assurance (QA) of complex linear accelerators is critical and highly time consuming. ArcCHECK Machine QA tool is used to test geometric and delivery aspects of linear accelerator. In this study we evaluated the performance of this tool. METHODS Machine QA feature allows user to perform quality assurance tests using ArcCHECK phantom.(More)
I dedicate this work to my parents. ACKNOWLEDGMENTS I would like to express my deepest gratitude to my advisor, Professor Meera Sitharam. Though it is a cliché to say so, this work would have been impossible without her very active involvement, constant encouragement and the inspiration I drew from her. The best analogy for what she taught me is someone(More)
PURPOSE 3DVH software is a patient specific quality assurance tool which estimates the 3D dose to the patient specific geometry with the help of Planned Dose Perturbation algorithm. The purpose of this study is to evaluate the impact of HU value of ArcCHECK phantom entered in Eclipse TPS on 3D dose & DVH QA analysis. METHODS Manufacturer of ArcCHECK(More)