Content management systems use various strategies to store and manage information. One of the most usual methods encountered in commercial products is to make use of the file system to store the raw content information, while the associated metadata is kept synchronized in a relational database management system. This strategy has its advantages but we believe it also has significant limitation...

university course timetabling problem is a serious challenge for the academic managers in each semester. because of a vast number of constraints and the complexity of relationship among the constraints, the problem is known to be of hard class. in this paper, a decision support system is proposed to assist the decision makers in solving the university course timetabling. the proposed system pro...

For a Perinatal-20 study, many data were to be collected over an extended period. A system for managing the data was needed so that the integrity of the data, and the quality of the research based on the data, could be ensured from the study’s start. More than 60 types of data collection forms were designed. To monitor a subject’s progress through the treatment program, some forms were collecte...

Recently, we newly developed a relrrtionrrl schema for eflectively building, integruting. and searching the DNA database on the relational datuhnse mcrnngement system, SYBASE, at DDBJ. The schema is nclmed the “DDBJschema”. The schema uliowed us to implement N DNA database mtmqement system with two types of window inteeaces, YAMATO und ASUKA, to easily build the DNA datcthu.se. The first type w...

Peer-to-Peer Database Management Systems (PDBMS) are still in the beginning of their evolution. They rise up p2p technology to exploit the power of available distributed database management technologies. The proposed PDBMS will be completely autonomous and any notions of centralization as central server or creating a cost-based global schema will be absent. In this paper a number of potential r...

This paper presents the mechanisms being designed into the next-generation data manager POSTGRES to support extendability. POSTGRES supports user defined data types, operators, functions, aggregate functions and access methods. This paper sketches the specification and implementation of each of these constructs.