Beyond Centralised Search Engines

Revision with unchanged content. In order to obtain an acceptable quality of filtering services in real time con­di­tions a trade-off between relevance of results and response time has to be addressed while searching for needed information in numerous distributed re­positories. Unfortunately, ignoring a necessity to address information re­trie­val in distributed and resource-aware manner is usually a serious drawback for many existing search engines that try to survive an ongoing information ex­plosion. The essence of a proposed distributed approach for information re­trieval is in comprehensive coordination and cooperation mechanisms which both take care of current availability of resources and try to improve them­selves during runtime. Additionally, they are able to guarantee delivery of results by combining multiple filtering strategies with very different ca­pa­bi­lities and by using inbuilt self-healing for recovery after failures. As the re­a­li­za­tion of the proposed mechanisms is described in details and experimentally pro­ven, this book is mainly addressed to professionals in distributed in­for­ma­tion retrieval and advanced search engine technologies. It is also directed to­wards researches in filtering strategies and agent technologies.