7,975 research outputs found
A Multi-Dimensional Trust Model for Heterogeneous Contract Observations
No full textIn this paper we develop a novel probabilistic model of computational trust that allows agents to exchange and combine reputation reports over heterogeneous, correlated multi-dimensional contracts. We consider the specific case of an agent attempting to procure a bundle of services that are subject to correlated quality of service failures (e.g. due to use of shared resources or infrastructure), and where the direct experience of other agents within the system consists of contracts over different combinations of these services. To this end, we present a formalism based on the Kalman filter that represents trust as a vector estimate of the probability that each service will be successfully delivered, and a covariance matrix that describes the uncertainty and correlations between these probabilities. We describe how the agents’ direct experiences of contract outcomes can be represented and combined within this formalism, and we empirically demonstrate that our formalism provides significantly better trustworthiness estimates than the alternative of using separate single-dimensional trust models for each separate service (where information regarding the correlations between each estimate is lost)
Steven Johnson Author Talk Poster
No full textK-State Book NetworkA poster advertising an author talk by Steven Johnson at Kansas State University on September 3, 2014. Steven Johnson's book "The Ghost Map" was the 2014-2015 common book
Rumours and Reputation: Evaluating Multi-Dimensional Trust within a Decentralised Reputation System
No full textIn this paper we develop a novel probabilistic model of computational trust that explicitly deals with correlated multi-dimensional contracts. Our starting point is to consider an agent attempting to estimate the utility of a contract, and we show that this leads to a model of computational trust whereby an agent must determine a vector of estimates that represent the probability that any dimension of the contract will be successfully fulfilled, and a covariance matrix that describes the uncertainty and correlations in these probabilities. We present a formalism based on the Dirichlet distribution that allows an agent to calculate these probabilities and correlations from their direct experience of contract outcomes, and we show that this leads to superior estimates compared to an alternative approach using multiple independent beta distributions. We then show how agents may use the sufficient statistics of this Dirichlet distribution to communicate and fuse reputation within a decentralised reputation system. Finally, we present a novel solution to the problem of rumour propagation within such systems. This solution uses the notion of private and shared information, and provides estimates consistent with a centralised reputation system, whilst maintaining the anonymity of the agents, and avoiding bias and overconfidence
Steven Bialer and Patti Smith, July 1978
No full textMusician, poet, and author Patti Smith sits on a bed in a hotel room in July 1978. The photograph was taken by Don Hamerman as part of a session for "Unicorn Times," an alternative performing arts periodical in Washington, D.C. Steven Bialer, the Design Director for "Unicorn Times," is seated on the bed next to Smith
Steven Garber
No full textSteven Garber speaks on the importance and value of truth.
Steven Garber is the principal of The Washington Institute for Faith, Vocation & Culture, which is focused on reframing the way people understand life, especially the meaning of vocation and the common good. A consultant to foundations, corporations and educational institutions, he is a teacher of many people in many places. The author of The Fabric of Faithfulness: Weaving Together Belief and Behavior, and Visions of Vocation: Common Grace for the Common Good, he is also a contributor to the books, Faith Goes to Work: Reflections from the Marketplace, and Get Up Off Your Knees: Preaching the U2 Catalogue. He lives with his wife Meg in Virginia
Steven Yedinak Interview
No full textLTC (RET) Steven M. Yedinak commissioned in the U. S. Army Infantry in 1963 and subsequently spent 26 years in Special Forces and Airborne Infantry. He served two combat tours in Vietnam (1966-67 & 1971-1972), and started the Mobile Guerrilla Force. He is the author of Hard to Forget: An American with the Mobile Guerrilla Force in Vietnam (Random House, 1998). He retired from the Army in 1989
Gamification is broken. An interview with Steven Poole
No full textSteven Poole is the author of Trigger Happy (2000. New York, NY: Arcade Publish), Unspeak (2006. New York, NY: Grove Press), and You Aren’t What You Eat (2012. In press). He has written extensively on books, culture, and videogames for The Guardian and other publications
Steven Pinker on language and thought
No full textEducação Superior::Linguística, Letras e Artes::LinguísticaThis video presents an exclusive preview of Steven Pinker's book: the stuff of thought. The author looks at language and how it expresses what goes on in our minds and how the words we choose communicate much more than we realize. For Steven Pinker, the brilliance of the mind lies in the way it uses just two processes to turn the finite building blocks of our language into infinite meanings. The first is metaphor: we take a concrete idea and use it as a stand-in for abstract thoughts. The second is combination: we combine ideas according to rules, like the syntactic rules of language, to create new thoughts out of old one
Steven Pinker on language and thought
No full textEducação Superior::Linguística, Letras e Artes::LinguísticaThis video presents an exclusive preview of Steven Pinker's book: the stuff of thought. The author looks at language and how it expresses what goes on in our minds and how the words we choose communicate much more than we realize. For Steven Pinker, the brilliance of the mind lies in the way it uses just two processes to turn the finite building blocks of our language into infinite meanings. The first is metaphor: we take a concrete idea and use it as a stand-in for abstract thoughts. The second is combination: we combine ideas according to rules, like the syntactic rules of language, to create new thoughts out of old one
Steven Pinker on language and thought
No full textEducação Superior::Linguística, Letras e Artes::LinguísticaThis video presents an exclusive preview of Steven Pinker's book: the stuff of thought. The author looks at language and how it expresses what goes on in our minds and how the words we choose communicate much more than we realize. For Steven Pinker, the brilliance of the mind lies in the way it uses just two processes to turn the finite building blocks of our language into infinite meanings. The first is metaphor: we take a concrete idea and use it as a stand-in for abstract thoughts. The second is combination: we combine ideas according to rules, like the syntactic rules of language, to create new thoughts out of old one
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