A commonly used strategy to improve search accuracy is through feedback techniques. Most existing work on feedback relies on positive information, and has been extensively studied in information retrieval. However, when a query topic is difficult and the results from the first-pass retrieval are very poor, it is impossible to extract enough useful terms from a few positive documents. Therefore,...

The number of participating systems has grown from 25 in TREC-1 to 36 in TREC-4 (see Table 1), including most of the major text retrieval software companies and most of the universities doing research in text retrieval. The diversity of the participating groups has ensured that TREC represents many different approaches to text retrieval, while the emphasis on individual experiments evaluated wi...

The human thymus exports newly generated T cells to the periphery. As no markers have been identified for these recent thymic emigrants (RTE), it is presently impossible to measure human thymic output. T cell receptor excision circles (TREC) have been recently used to assess thymic output during both health and disease. Using a mathematical model, we quantify age-dependent changes both in the n...

in today's organizations, an effective human resource management as the most important organizational source- especially in critical industries such as electricity industry- is not achievable unless having a systematic, specialized and professional perspective. professionalism is a perfect and holistic view to a work or working situation that it encompasses a comprehensive mastery in affai...

The eighth Text REtrieval Conference TREC was held at the National Institute of Standards and Tech nology NIST on November The conference was co sponsored by NIST and the Information Technology O ce of the Defense Advanced Research Projects Agency DARPA TREC is the latest in a series of workshops designed to foster research in text retrieval For analyses of the results of previous workshops see...

In this paper I describe my TREC 2005 participation. The system used was–except from one new module–the same as in TREC 2004. In the following I will describe this new module, which uses the annotated Natural Language data collected in the FrameNet project in order to find paraphrases to answer questions. I will furthermore present and discuss the TREC 2005 results and compare them to those ach...

Our TREC 2008 e ort used fusion IR methods identical to those used for our TREC 2007 e ort; in addition we used logistic regression to attempt to learn the optimal K value for the primary F1@K measure introduced at TREC 2008. We used the Wumpus search engine combining several methods that have proven successful, including cover density ranking and Okapi BM25 ranking, and combination methods. St...

We present a question-answering system Jellyfish. Our approach is based on marking and matching steps that are implemented using the methodology of cascaded regular-expression rewriting. We present the system architecture and evaluate the system using the TREC 2004, 2005, and 2006 datasets. TREC 2004 was used as a training dataset, while TREC 2005 and TREC 2006 were used as testing dataset. The...

The QACTIS system has been tested in previous years at the TREC Question Answering Evaluations. This paper describes new enhancements to the system specific to TREC-2006, including basic improvements and threshold-ing experiments, filtered and Internet-supported pseudo-relevance feedback for information retrieval, and emerging statistics-driven question-answering. For contrast, we also compare ...