Research On Managing Communities Of Peers Based On Semantic Web

We are facing an unforeseen growth of the complexity of (data, content and) knowledge. Here we talk of complexity meaning the size, the sheer numbers, the spatial and temporal pervasiveness of knowledge, and the unpredictable dynamics of knowledge change, unknown at design time but also at run time. The obvious example is the Web and all the material, also multimedia, which is continuously made available on line. Our goal in this research is to propose a novel approach which deals with this level of complexity and that, hopefully, will overcome some of the scalability issues shown by the existing data and knowledge representation technology. The key idea is to propose a bottom-up approach where diversity is considered as a feature which must be maintained and exploited and not as a defect that must be absorbed in some general schema. The proposed solution amounts to making a paradigm shift from the view where knowledge is mainly assembled by combining basic building blocks to a view where new knowledge is obtained by the design or run-time adaptation of existing knowledge. Typically, we will build knowledge on top of a landscape of existing highly interconnected knowledge parts. Knowledge will no longer be produced ab initio, but more and more as adaptations of other, existing knowledge parts, often performed in runtime as a result of a process of evolution. This process will not always be controlled or planned externally but induced by changes perceived in the environment in which systems are embedded.The challenge is to develop design methods and tools that enable effective design by harnessing, controlling and using the effects of emergent knowledge properties. This leads to the proposal of developing adaptive and, when necessary, self-adaptive knowledge systems and to the proposal of developing a new methodology for knowledge engineering and management.In order to implement the vision of the KnowDive project, a set of distinct but complementary systems is being currently developed. The goal of these systems is to provide a set of technological tools to support the user in the creation, acquisition, adaptation, evolution, management, and sharing of knowledge and data within the global infrastructure of the emerging Web 2.0.In this thesis, it presents a new topic in the semantic area, which is a multidiscipline among semantic web, social networking, access control, and information security. We hope that we could reuse and rebuild the semantic technology and the idea of knowledge management in Sweb system mostly to implement peers management. At the mean while, we also want to meet the web 2.0 including the most popular SNSs websites like facebook and linkedIn and to make the peers management into the net communities.The key point of this thesis is the theory research on the peers management during the period of Sweb's designation and implementation. Actually, we should regard users as a special kind of document which have specific attributes information. We could replicate the method of document management to the peers management in Sweb for reference. For metadata, it means one kind of attributes which are created both automatically and manually when the user ontology building. We predefined the definition of user attributes and PeopleType based on FOAF (Friend of a friend). And PeopleType will facilitate the procedure of meta-people's creation and the user management of communities of peers.Besides, we also did some research on the access control based on description logic in Sweb. The traditional way to do that is based on RBAC (Role Based Access Control) prototype. As we considered it in a semantic system, we could formalize it through the description logic, and use the reasoner to implement it. Thus, we propose a novel model which named RelBAC short for Relational Based Access Control.And the system definition and description have been given. Some of the functions are implemented in Sweb yet.At last, we hope to enrich the Sweb peers management with more elements of Semantic and Web 2.0, especially the thinking of friend of a friend and social networking services. It is a meaningful attempt to extend the existing semantic web platform. We will reuse the same framework and code to implement everydoc, everybody, everytime and everywhere. Through Sweb system, we will successful to manage document, peers, calendar and places which mean everything. It will be a main research direction for the author in future as well.