In this paper we demonstrate that in an ideal Distributed Information Retrieval environment, taking the ability of each collection server to return relevant documents into account when selecting collections can be effective. Based on this assumption, we suggest a new approach to resolve the collection selection problem. In order to predict a collection's ability to return relevant documents, we...

A Grid Information Retrieval (GIR) simulation was used to process the TREC Million Query Track queries. The GOV2 collection was partitioned by hostname and the aggregate performance of each host, as measured by qrel counts from the past TREC Terabyte Tracks, was used to rank the hosts in order of quality. Only the 100 highest quality hosts were included in the Grid IR simulation, representing l...

In this thesis, we present a distributed architecture for a Web search engine, based on the concept of collection selection. We introduce a novel approach to partition the collection of documents, able to greatly improve the effectiveness of standard collection selection techniques (CORI), and a new selection function outperforming the state of the art. Our technique is based on the novel query...

Collection selection is one of the key problems in distributed information retrieval. Due to resource constraints it is not usually feasible to search all collections in response to a query. Therefore, the central component (broker) selects a limited number of collections to be searched for the submitted queries. During the past decade, several collection selection algorithms have been introduc...

In this paper, we address the problem of locating collection centers for a company that collects used products from product holders. Each product holder has an inherent willingness to return the product, and makes the decision on the basis of financial incentive offered by the company. We present a mixed-integer nonlinear facility location-allocation model to find the optimal locations, the opt...

In order to adequately ensure the protection of human health and the environment from the thousands of presently suspected hazardous substances and the new compounds added to those by new industrial processes, sophisticated approaches to hazard assessment and monitoring are being established. Environmental specimen banking (ESB) is necessary, useful, and important for environmental monitoring c...

Background. The barley collection at the N.I. Vavilov AllRussian Institute of Plant Genetic Resources (VIR), being main source material for breeding, is insufficiently studied under conditions extreme continental climate. purpose research was to assess adaptability cultivars held by VIR continentality. Material and methods . targets were 24 representing various breeding centers tolerance region...

In NAND flash memory devices, pages marked “invalid” can remain in blocks and occupy flash space. Therefore, it is necessary to physically eliminate invalid pages and collect valid pages from the victim blocks in order to sustain flash write performance and storage lifespan. Although there have been many research studies on efficient garbage collection techniques, research has focused on victim...

Six Sigma is a strategy for achieving process improvement and operational excellence within an organization. Decisions on critical parameter selection in analysis phase are always very crucial; it plays a primary role in successful execution of Six Sigma project and for productivity improvement in manufacturing environment and involves the imprecise, vague and uncertain information. Using a cas...