The size of the Web is growing exponentially. The number of indexable pages on the web has exceeded 2 billion (Lyman & Varian, 2000). It is more difficult for search engines to keep an up-to-date and comprehensive search index, resulting in low precision and low recall rates. Users often find it difficult to search for useful and high-quality information on the Web. Domain-specific search engin...

Search engines are the most powerful resources for finding information on the rapidly expanding World Wide Web (WWW). Finding the desired search engines and learning how to use them, however, can be very time consuming. The integration of such search tools enables the users to access information across the world in a transparent and efficient manner. These systems are called meta-search engines...

As all the recent market surveys witness, the World Wide Web (WWW) is expanding at a phenomenal rate, both in the number of users and in the amount of available information. This has made the World Wide Web one of the key elds for companies advertisement. On the other hand, advertisement on the web depends crucially on its visibility, i.e. on the possibility to be noticed by as many users as po...

Distributed heterogeneous search environments are an emerging phenomenon in Web search. They can be viewed as a federation of independently controlled metasearchers and many specialised search engines. Specialised search engines provide focused search services in a specific domain (e.g. a particular topic). Metasearchers help to process user queries effectively and efficiently by distributing t...

The growing world-wide globalization and the possibility to use new innovations of the digital economy leads to the fact that more and more processes and services are being virtualized. The purpose of this paper is to describe, synthesize, evaluate, and integrate the results of prior research on Process Virtualization Theory by conducting a systematic literature review. We selected six academic...

Frequently a user's information needs are stored in the databases of multiple search engines. It is inconvenient and ineÆcient for an ordinary user to invoke multiple search engines and identify useful documents from the returned results. To support uni ed access to multiple search engines, a metasearch engine can be constructed. When a metasearch engine receives a query from a user, it invokes...

World Wide Web (WWW) search engines (e.g. AltaVista, Infoseek, HotBot, etc.) have a number of deficiencies including: periods of downtime, low coverage of the WWW, inconsistent and inefficient user interfaces, out of date databases, poor relevancy ranking and precision, and difficulties with spamming techniques. Meta search engines have been introduced which address some of these and other diff...

Search engines in the web are the only tools to explore the content in the web for most of the users. Increasingly, users rely on search engines and in most cases the retrieval depends solely on the performance of search engines. Hence newer research is being poured in to the web search mechanism. Thus, this book on web search engine research is a significant tool to activate the thrust areas o...

Existing constraint programming systems offer a fixed set of inference engines implementing search strategies such as single, all, and best solution search. This is unfortunate, since new engines cannot be integrated by the user. The paper presents first-class computation spaces as abstractions with which the user can program inference engines at a high level. Using computation spaces, the pape...

We propose a parallel MPI search engine that is capable of automatically switching between asynchronous message passing and bulk-synchronous message passing modes of operation. When the observed query traffic is small or moderate the standard multiple managers/workers thread based model of message passing is applied for processing the queries. However, when the query traffic increases a roundro...