In a distributed document database system, a query is processed by passing it to a set of individual collections and collating the responses. For a system with many such collections, it is attractive to first identify a small subset of collections as likely to hold documents of interest before interrogating only this small subset in more detail. A method for choosing collections that has been w...

In an environment of distributed text collections, the first step in the information retrieval process is to identify which of all available collections are more relevant to a given query and should thus be accessed to answer the query. Collection selection is difficult due to the varying relevance of sources as well as the overlap between these sources. Previous collection selection methods ha...

The centralized web search paradigm introduces several problems, such as large data traffic requirements for crawling, index freshness problems and problems to index everything. In this study, we look at collection selection using highly discriminative keys and query-driven indexing as part of a distributed web search system. The approach is evaluated on different splits of the TREC WT10g corpu...

This article tackles the collection selection problem from the query side. Queries are enhanced by mapping them to subjects in an ontology; the associated subject classification terms are then employed to retrieve collections. An experimental comparison was performed with the state of the art ReDDE system, which relies on estimates of collection size to rank collections. Although the research i...

2.1 Chain of Custody ..................................................................................................................14 2.2 Specimen Collection .............................................................................................................15 2.2.1 Specimen Containers................................................................................................15...

Thermal management and air distribution performance are assuming a key role for achieving the energy saving and the IT equipment reliability for data centers (DCs). In recent years, to monitor and to control their variation several thermal performance metrics were introduced. This work presents a critical review on the most important thermal indices for DCs currently used. The main formulas and...