Akifumi Makinouchi

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In this paper definitions of unnormalized relation, functional dependency on it and Normal Form are presented. The Normal Form plays a key role in our relational data model in which unnormalized relations are admitted as does the Third Normal Form of Codd in the data model of normalized relation. Properties pertaining to Normal Form are discussed(More)
This paper presents a dynamic motion control technique for human-like articulated figures in a physically based character animation system. This method controls a figure such that the figure tracks input motion specified by a user. When environmental physical input such as an external force or a collision impulse are applied to the figure, this method(More)
New applications such as CAD, AI, and hypermedia require directrepresentation and flexible use of complex objects, behavioralknowledge, and multimedia data. To this end, we have devised a knowledgebase management system called Jasmine. An object-oriented approach in aprogramming language also seems promising for use in Jasmine. Jasmineextends the current(More)
In this paper, we present a novel technique for real-time cloth simulation. The method combines dynamic simulation and geometric techniques. Only a small number of particles (a few hundred at maximum) are controlled using dynamic simulation to simulate global cloth behaviors such as waving and bending. The cloth surface is then smoothed based on the elastic(More)
Many content-based video data indexing and retrieval systems have utilized the syntactic contents of the video sequences such as color, texture, and shape. And only a few researches have addressed indexing and retrieving video data by motion. In this paper, we present a method to automatically compute motionbased indexes for video units and to retrieve(More)
Though parallel database systems have been extensively studied, as far as we know, the parallel algorithms of R-tree propsed so far are limited to one workstation with multiprocessors or multi disks, where parallel sorting algorithm or concurrent I/O is used to improve the performance. For the search of R-tree, multiple search paths from the root to leaves(More)