Yoshimasa Ohashi

A document retrieval system based on citations using fuzzy graphs

Abstract A fuzzy retrieval system based on citations is proposed. A citation implies a trend of research or inheritance of knowledge. If we register a large number of documents and their citations, we will have a network of citations. Using the network of citations, one can recognize background or development of a research of a document. A citation itself is Boolean, but we define graded relations among documents through fuzzy graph theory. The membership function resulting from the retrieval is given by this relation. We discuss mathematical properties and their meaning in practical retrieval. The proposed system has been implemented on a personal computer and more than 600 documents have been registered. We will show experimental results lastly.

The Evaluation Function Of Minimum Resolvable Scattering Difference For Active Coherent Imaging System

MRSD, which is the expanded concept of MRTD in passive thermal imager, was proposed to evaluate the system performance of an active coherent imaging system. An evaluation function of MRSD is achieved and a measurement system using computer generated 4-bar target is considered. Several results of calculated and measured MRSD are fitted well.