Data fusion methods commonly use and compare all the documents returned by multiple retrieval systems to create a new result list. On the one hand, as documents further down in the result lists are considered, a document’s probability of being relevant decreases significantly. On the other hand, retrieval systems tend to find similar relevant documents when searching the same database, but they...

TREC-8 represents the fth year that the MultiText project has participated in TREC [2, 1, 4, 5]. The MultiText project develops and prototypes scalable technologies for parallel information retrieval systems implemented on networks of workstations. Research issues are addressed in the context of this parallel architecture. Issues of concern to the MultiText Project include data distribution, lo...

The TREC Interactive Track has the goal of investigating interactive information retrieval by examining the process as well as the results. In TREC-9 six research groups ran a total of 12 interactive information retrieval (IR) system variants on a shared problem: a factnding task, eight questions, and newspaper/newswire documents from the TREC collections. This report summarizes the shared expe...

Since its inception, the venerable TREC retrieval conference has relied upon specialist assessors or participating groups to create relevance judgments for the tracks that it runs. However, recently crowdsourcing has been proposed as a possible alternative to traditional TREC-like assessments, supporting fast accumulation of judgments at a low cost. 2010 was the first year that TREC experimente...

Information retrieval (IR) research on text collections has concentrated on improving the effectiveness of the indexing and retrieval operations. For the most part, the evaluation of IR systems has been carried out on relatively small collections of documents, queries and relevance assessments. In 1992 the first of a series of evaluation exercises called TREC (Text REtrieval Conference) was lau...

A Imunodeficiência combinada grave (SCID) é uma doença primária letal, quando não empregado tratamento precoce, diagnóstico por meio da análise do círculo de excisão receptor células T (TREC) e o recombinação kappa (KREC). Por intermédio dos cartões Guthrie papel filtro, são extraídas as informações baseadas no teste molecular reação em cadeia polimerase (polymerase chain reaction, PCR), tempo ...

Postischemic temperature, which modulates brain injury, is commonly determined via a rectal temperature (Trec) probe. This procedure causes a stress-induced fever (SIF) in rodents that may aggravate injury or diminish the efficacy of a neuroprotectant. We continually measured core temperature (Tcore) via an implanted telemetry probe and made 16 Trec measurements over 4 days in sham and ischemic...

Interleukin 7 (IL-7) is critical in maintaining thymic-dependent and thymic-independent pathways of T-cell homeostasis. T-cell receptor (TCR) rearrangement excision circles (TRECs) have been used as markers for recent thymic emigrants (RTEs) in assessing human thymic function. To study the thymic and peripheral effects of IL-7 on RTEs, we measured TREC content and peripheral naive T-cell subset...