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Trust Network Analysis with Subjective Logic
- In Proceedings of the 29th Australasian Computer Science Conference (ACSC2006), CRPIT Volume 48
, 2006
"... Trust network analysis with subjective logic (TNA-SL) simplifies complex trust graphs into series-parallel graphs by removing the most uncertain paths to obtain a canoni-cal graph. This simplification could in theory cause loss of information and thereby lead to sub-optimal results. This paper descr ..."
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Cited by 97 (12 self)
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Trust network analysis with subjective logic (TNA-SL) simplifies complex trust graphs into series-parallel graphs by removing the most uncertain paths to obtain a canoni-cal graph. This simplification could in theory cause loss of information and thereby lead to sub-optimal results. This paper describes a new method for trust network analysis which is considered optimal because it does not require trust graph simplification, but instead uses edge splitting to obtain a canonical graph. The new method is compared with TNA-SL, and our simulation shows that both methods produce equal results. This indicates that TNA-SL in fact also represents an optimal method for trust network analy-sis and that the trust graph simplification does not affect the result. 1
A Survey Study on Reputation-based Trust Mechanisms in Service-Oriented Computing
"... ABSTRACT – The Reputation-Based Trust mechanism (RBT) helps a service assess the trustworthiness of offered services, based on the feedback obtained from their users. A key challenge to apply the RBT is to prevent the cheating behavior of users when they provide recommendations-- they might give unf ..."
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ABSTRACT – The Reputation-Based Trust mechanism (RBT) helps a service assess the trustworthiness of offered services, based on the feedback obtained from their users. A key challenge to apply the RBT is to prevent the cheating behavior of users when they provide recommendations-- they might give unfair ratings to benefit themselves. This survey describes the research communities that are making efforts to solve the problems of the RBT in Service-Oriented Computing (SOC) domain. A summary of findings is then discussed to position the trends and directions of future studies. The survey can be used as a reference guide in a hope to make trust-based service systems more reliable and scalable.
SATYA: A Reputation-based Approach for Service Discovery and Selection in Service Oriented Architectures
"... ABSTRACT We present SATYA, a system that computes a reputation value for Web service providers in order to enhance the service discovery and selection process increasing reliability in SOA transactions. In this work, objective values of service evaluations supplied by monitoring entities are used a ..."
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ABSTRACT We present SATYA, a system that computes a reputation value for Web service providers in order to enhance the service discovery and selection process increasing reliability in SOA transactions. In this work, objective values of service evaluations supplied by monitoring entities are used along with subjective evaluations supplied by service consumers. The objective and subjective values are compared in order to: (i) validate subjective evaluations; (ii) minimize the degree of subjectivity of computed reputation values; and (iii) discover consumers' preferences in terms of QoS metrics. By assigning Web services a trustable reputation value, SATYA enhances the service descriptions provided by registries with additional information to be used during the service discovery phase.
A BROKER-BASED WEB SERVICE ARCHITECTURE FOR SERVICE REGISTRATION AND DISCOVERY WITH
"... The increasing number of Web services over the web makes the consumer to apply tools to search for appropriate Web services available though out the world. Web service technology provides a way for simplifying inter-operability among different platforms. There exist many Web services which reveal si ..."
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The increasing number of Web services over the web makes the consumer to apply tools to search for appropriate Web services available though out the world. Web service technology provides a way for simplifying inter-operability among different platforms. There exist many Web services which reveal similar functional characteristics; non-functional properties (QoS) have become essential criteria to enhance the discovery and registration process of services. The purpose of web service discovery is to choose best possible web service for a particular task. When dynamic discovery is used in Web Services, it is common that the result of the discovery contains more than one web service provider. In this paper, we proposed a novel approach for designing and developing a broker-based architecture (WSB) and its QoS-based matching, ranking and selection algorithm for evaluating and discovering the best possible Web services for a specific task. We explained the underlying ideas of our approach and experimental results have shown the effectiveness of our approach.
te Maleisie Dit proefschrift is goedgekeurd door de promotor:
"... ter verkrijging van de graad van doctor aan de Universiteit Twente, op gezag van de rector magnificus, prof. dr. W.H.M. Zijm, volgens besluit van het College voor Promoties in het openbaar te verdedigen op woensdag 20 september 2006 om 15.00 uur door ..."
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ter verkrijging van de graad van doctor aan de Universiteit Twente, op gezag van de rector magnificus, prof. dr. W.H.M. Zijm, volgens besluit van het College voor Promoties in het openbaar te verdedigen op woensdag 20 september 2006 om 15.00 uur door
At Home In Service Discovery Vasughi SundramoorthyAT HOME IN SERVICE DISCOVERY
"... ter verkrijging van de graad van doctor aan de Universiteit Twente, op gezag van de rector magnificus, prof. dr. W.H.M. Zijm, volgens besluit van het College voor Promoties in het openbaar te verdedigen op woensdag 20 september 2006 om 15.00 uur door Vasughi Sundramoorthy ..."
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ter verkrijging van de graad van doctor aan de Universiteit Twente, op gezag van de rector magnificus, prof. dr. W.H.M. Zijm, volgens besluit van het College voor Promoties in het openbaar te verdedigen op woensdag 20 september 2006 om 15.00 uur door Vasughi Sundramoorthy
Towards New Generation of Mobile Communications: Discovery of Ubiquitous Resources
"... Abstract. Continual advances in wireless telecommunications together with the rapid proliferation of various types of portable devices are paving the road towards new generation of mobile communications. Next-generation mobile networks will create environments crowded with diverse types of ubiquitou ..."
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Abstract. Continual advances in wireless telecommunications together with the rapid proliferation of various types of portable devices are paving the road towards new generation of mobile communications. Next-generation mobile networks will create environments crowded with diverse types of ubiquitous semantic-aware communication-enabled devices which will provide a remarkable selection of resources (information and services). Consequently, such an environment will require efficient mechanisms which can match supplies (available resources) to demands (requested resources), anywhere and anytime. In this paper, we propose an economic approach to solving this problem combined with AI (Artificial Intelligence) concepts. We implemented a multi-agent system for enabling autonomous inter-device coordination in the heterogeneous environment of pervasive next-generation mobile networks. The efficiency of our model is realized by applying a resource discovery process which uses two-level filtration of available resources before a final ranked set of eligible resources is recommended to requesters in response to their needs. The filtration processes do not only consider the semantic information associated with available resources, but also ratings regarding the actual performance of resource providers (with respect to both price and quality) and the prices paid by providers for advertising their resources.
