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Partial observable update for subjective logic and its application for trust estimation

Title	Partial observable update for subjective logic and its application for trust estimation
Author	Kaplan, L., Şensoy, Murat, Chakraborty, S., de Mel, G.
Publication Date:	2015
Publication Place	- Elsevier
Subject	Subjective logic, Partial observations, Dirichlet distributions, Uncertain information, Trust management
Type	Periodical
Language	English
Digital	Yes
Manuscript	No
Library:	Özyeğin University
Library Asset ID	1872-6305
Record ID	abf0f2dc-7618-4f75-bd5d-c7de9b1828ab
Library Location	Computer Science
Date	2015
Notes	U.S. Army Research Laboratory ; U.K. Ministry of Defence ; TÜBİTAK
Sample Text	Subjective Logic (SL) is a type of probabilistic logic, which is suitable for reasoning about situations with uncertainty and incomplete knowledge. In recent years, SL has drawn a significant amount of attention from the multi-agent systems community as it connects beliefs and uncertainty in propositions to a rigorous statistical characterization via Dirichlet distributions. However, one serious limitation of SL is that the belief updates are done only based on completely observable evidence. This work extends SL to incorporate belief updates from partially observable evidence. Normally, the belief updates in SL presume that the current evidence for a proposition points to only one of its mutually exclusive attribute states. Instead, this work considers that the current attribute state may not be completely observable, and instead, one is only able to obtain a measurement that is statistically related to this state. In other words, the SL belief is updated based upon the likelihood that one of the attributes was observed. The paper then illustrates properties of the partial observable updates as a function of the state likelihood and illustrates the use of these likelihoods for a trust estimation application. Finally, the utility of the partial observable updates is demonstrated via various simulations including the trust estimation case.
DOI	10.1016/j.inffus.2015.01.005
Cilt	26

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Özyeğin University

Partial observable update for subjective logic and its application for trust estimation

Author Kaplan, L., Şensoy, Murat, Chakraborty, S., de Mel, G.

Publication Date 2015

Publication Place - Elsevier

Subject Subjective logic, Partial observations, Dirichlet distributions, Uncertain information, Trust management

Type Periodical

Language English

Digital Yes

Manuscript No

Library Özyeğin University

Library Asset ID 1872-6305

Record ID abf0f2dc-7618-4f75-bd5d-c7de9b1828ab

Library Location Computer Science

Date 2015

Notes U.S. Army Research Laboratory ; U.K. Ministry of Defence ; TÜBİTAK

Sample Text Subjective Logic (SL) is a type of probabilistic logic, which is suitable for reasoning about situations with uncertainty and incomplete knowledge. In recent years, SL has drawn a significant amount of attention from the multi-agent systems community as it connects beliefs and uncertainty in propositions to a rigorous statistical characterization via Dirichlet distributions. However, one serious limitation of SL is that the belief updates are done only based on completely observable evidence. This work extends SL to incorporate belief updates from partially observable evidence. Normally, the belief updates in SL presume that the current evidence for a proposition points to only one of its mutually exclusive attribute states. Instead, this work considers that the current attribute state may not be completely observable, and instead, one is only able to obtain a measurement that is statistically related to this state. In other words, the SL belief is updated based upon the likelihood that one of the attributes was observed. The paper then illustrates properties of the partial observable updates as a function of the state likelihood and illustrates the use of these likelihoods for a trust estimation application. Finally, the utility of the partial observable updates is demonstrated via various simulations including the trust estimation case.

DOI 10.1016/j.inffus.2015.01.005

Cilt 26