Pii: S0306-4573(99)00017-5

Text Windows and Phrases Differing by Discipline, Location in Document, and Syntactic Structure

90.4 83.0 97.5 126.0 57.9 54.3 65.0 71.8 Citations 232.0 233.5 373.8 103.1 97.7 182.8 Sec. Hdrs. 42.2 20.9 29.6 19.5 16.0 22.3

Pii: S0306-4573(98)00049-1

Re-ranking model based on document clusters

In this paper, we describe a model of information retrieval system that is based on a document reranking method using document clusters. In the ®rst step, we retrieve documents based on the inverted®le method. Next, we analyze the retrieved documents using document clusters, and re-rank them. In this step, we use static clusters and dynamic cluster view. Consequently, we can produce clusters th...

Experimentation as a way of life: Okapi at TREC

The Okapi system has been used in a series of experiments on the TREC collections, investigating probabilistic models, relevance feedback and query expansion, and interaction issues. The TREC-6 ad hoc task was used to test an application of a new relevance weighting formula, which takes account of documents judged nonrelevant. The application was to a form of blind feedback (using the top-ranke...

Information behavior in dynamic group work contexts: interwoven situational awareness, dense social networks and contested collaboration in command and control

In many dynamic work situations, no single individual can acquire the varied and often rapidly expanding information needed for success. Individuals must work together to collect, analyze, synthesize and disseminate information throughout the work process. Perhaps one of the most dynamic work contexts is command and control in the military at the battalion level which directs 300 to 1000 soldie...