Kiyoshi Nitta

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In our rst participation in TREC, our focus was on improving the basic ranking systems and applying text clustering techniques for query expansion. We tested a variety of techiniques including reference measures, passage retrieval, and data fusion for the basic ranking systems. Some techiniques were used in the o cial run, others were not used because of(More)
Large-scale RDF graph databases stored in shared-nothing clusters require query processing engine that can effectively exploit highly parallel computation environment. We propose algebra of RDF graphs and its physical counterpart, physical algebra of RDF graphs, designed to implement queries as distributed dataflow programs that run on cluster of servers.(More)
An interactive computer system for supporting the emergent stages (or upper streams) in human intellectual activities has been developed. In the system it is intended to integrate facilities for supporting generation, collection, organisation, and presentation of ideas and advising on the divergence and convergence of the ideas. This paper explains the(More)
The D-ABDUCTOR system was originally developed as a diagram-based idea organizer with facilities for visualization and manipulation of a large class of graphs. It has since been enhanced t o improve its extensibility, and now function exchangeability, functional independence, and configurability without programming have become important features. The(More)
1 Abstract In our rst participation in TREC, our focus was on improving the basic ranking systems and applying text clustering techniques for query expansion. We tested a variety of techiniques including reference measures, passage retrieval, and data fusion for the basic ranking systems. Some te-chiniques were used in the oocial run, others were not used(More)
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