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MOOD, materials object-oriented database, is a research project in which the realization of a new kind of material database service is attempted on the basis of the recent object-oriented database paradigm. MOOD-SX is the latest of a series of experimental database systems developed and made public in this project. It inherits fidelity in material data expression and precise data discrimination in data retrieval from its predecessors. Further, it consists of a server part and a client part which respectively operate on different UNIX hosts and communicate with each other through the Internet. The client process provides a user interface necessary for the user to manipulate complex expressions of both input data and query. The server process supports this by supplying information on class hierarchy and data structure, and also by performing database query processing on requests from clients. With experiments where these processes were respectively placed on hosts at Tsukuba and Sendai 250 km apart, it has been found that this kind of material database service is feasible.
material database, primary material data, object-oriented database, the Internet
Associate professor, Tohoku University, Sendai,