Ma, Jiangang (2010) Towards efficient collaboration for e-service transaction management : semantics, security and reliability. PhD thesis, Victoria University.

Abstract

In this thesis, we address the challenges of a collaborative Web services-based transaction context by presenting an access control framework and models for supporting semantic, secure and reliable collaboration. The proposed approaches depend on workflow technologies by integrating control flows and data flows into a workflow model, and they employ a relaxed transaction concept for fault tolerance, in order to maintain the processes consistencies, as well as, data consistencies even in presence of failures. To achieve these objectives, we first locate relevant Web services by a semantic approach. The key idea of our approach is to indirectly associate the intention of users to the advertisements in Web services by applying Probabilistic Latent Semantics Analysis (PLSA). Then, we model the internal activities within an institution by employing workflow technology whilst the individual workflow models of participating institutions can be mapped to process views, which are further described by Web services. Based on the process view model, a two layered access control architecture is proposed to protect computing resources. Finally, the atomicity concept is relaxed by integrating transactions and exception handling models in order to ensure the reliable collaborations on the Web. The main contributions of this thesis are threefold. First, we proposed a novel approach to find relevant services through the combination of keyword technique and the semantics extracted from the services’ descriptions by using a probabilistic semantic approach in order to handle poor scalability and lack of semantics. Second, a novel two layered access control model based on the general principles of the order of security priority in an organization is proposed. With the model, various roles are associated with views, so that right users can only see necessary parts of workflows exposed to them. Third, the atomicity sphere model is relaxed by considering two levels of atomicity abstraction for supporting reliable collaboration at the level of process, as well as, at the level of data to maintain the process consistency and data consistency in case of failures.

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