CDS関連学術論文 (2009-3)

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Toshio Kodama, Tosiyasu L. Seki, and Yoichi Seki, "A Data Modeling Example of File Management using the Cellular Data System", Proceedings of the 4th WSEAS International Conference on Computer Engineering and Applications (CEA 2010, January 27-29, University of Harvard, Cambridge, USA), pp.90-pp.95, The Thomson Corporation, 2009.

In the era of cloud computing, data is processed within "the cloud", and data and its dependencies between systems or functions progress and change constantly within "the cloud", as user requirements change. Such information worlds are called cyberworlds. In designing cyberworlds, the Incrementally Modular Abstraction Hierarchy (IMAH) gives a most appropriate mathematical background to model dynamically changing cyberworlds by descending from the abstract level to the specific one, while preserving invariants. An attaching function is defined on the adjunction space level to model attachment of spaces by an equivalence relation in IMAH. In this paper, we have improved the attaching function to the Cellular Data System (CDS) that we developed based on IMAH. The function is quite effective in business application development when a system user recognizes an equivalence relation in business objects. We have also shown an example of the use of CDS for file permission information management under an unexpected situation, such as when an organizational structure or its staff assignments change, using CDS. In the example, we design and take advantage of spaces on three of the seven levels of IMAH, in order of abstractness: the set theoretical level, the topological space level and the adjunction space level.