Heterogeneous Closed Information Sources and Open Services

This paper shows the existence of the users who want to receive various services on the Internet with keeping their data private. This situation often occurs when data are not sufficiently confirmed that there is no error in them, while the data would like to be tried to be analyzed. Additionally, the data may be stored in databases managed by various database management systems or files according to the users. This paper shows the large-scale configuration and the small-scale one addressing to this situation. The large-scale configuration uses mediation system. The user´s computer is required to be installed as a data server. In the small-scale configuration, the user´s computer is just a client one. It sends requests to the computing server with the data just required.