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MAKINO JUNICHIRO The Korean Astronomical Society 2005 Journal of The Korean Astronomical Society Vol.38 No.2
We overview the GRAPE (GRAvity piPE) project. The goal of the GRAPE project is to accelerate the astrophysical N-body simulations. Since almost all computing time is spent for the evaluation of the gravitational force between particles, we can greatly accelerate many N-body simulations by developing a specialized hardware for the force calculation. In 1989, the first such hardware, GRAPE-1, was completed, with the peak speed of 120 Mflops. In 2003, GRAPE-6 was completed, with the peak speed of 64 Tflops, which is nearly 106 times faster than GRAPE-l and was the fastest computer at that time. In this paper, we review the basic concept of the GRAPE hardwares, the history of the GRAPE project, and two ongoing projects, GRAPE-DR and Project Milkyway.
Definition of Visibility in Three Dimensional Space by CG Technology for Security Cameras/Guards
Mitsunori Makino 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
This paper proposes a revised definition of visibility of objects for generalized 3D art gallery problem, to which the ray tracing algorithm is introduced. The proposed visibility provides level of direct/indirect surveillance from single/multiple viewpoints such as cameras and/or guards, which takes 3D location, mirroring, transmitting, dust effect and obstruction into account. The proposed method regards specular reflection (highlight) effect of the targets as interference for the visibility, while the previously proposed method does it as either positive or negative for the visibility. The proposed visibility is expected to evaluate targets with high priority on recognition.