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Takatsu, Sumire,Hirano, Takuya,Kitao, Shiro,Shiramatsu, Kuniaki,Yajima, Masanobu 통신위성우주산업연구회 2004 Joint Conference on Satellite Communications Vol.2004 No.-
To realize high data rate satellite communication service for future multi-media applications, the Wideband InterNetworking engineering test and Demonstration Satellite (WINDS) has been developed by the Japan Aerospace Exploration Agency (JAXA). WINDS is equipped with Ka-band transmitting and receiving Active Phased Array Antennas (APAAs), which can flexibly establish communication to any area electronic beam scanning. Before development of the APAAs flight model, we developed partial models of transmitting and receiving APAAs to evaluate their beam performance. We verified the basic performance such as radiation pattern, beam scanning, and input-output performance. This paper describes the design of the APAAs and development results of a partial model.
A VLSI IMPLEMENTATION OF MPEG2 MOTION ESTIMATION ALGORITHM BASED ON MACROBLOCK CLUSTERING
Onoye,Takao,Takatsu,Masamichi,Fjita,Gen,Shirakawa,Isao,Matsumura,Kenji 대한전자공학회 1995 ICVC : International Conference on VLSI and CAD Vol.4 No.1
A new approach to the motion estimation is described dedicatedly for MPEG2 MP@HL moving pictures, which is based on the macroblock clustering. Adopting a two-level hierarchy in detecting motion vectors, the computational complexity is greatly reduced without degrading the quality of vectors. The result of motion detect simulation shows the clustering approach is practical enough for realtime encoding of HDTV level pictures. The proposed algorithm has been synthesized to a 2-D systolic array VLSI which contains 785K transistors, and occupies 102 ㎟ with a 0.6 ㎛ triple-metal CMOS technology.
Tribological Properties of Sintered Diamonds with WC-Co Matrix
Umeda, Kazunori,Tanaka, Akihiro,Takatsu, Sokichi The Korean Ceramic Society 1997 The Korean journal of ceramics Vol.3 No.3
Sintered diamond/(WC-Co) composites were prepared by spark plasma sintering technique. Tribological properties were measured at temperatures from RT to $500^{\circ}C$ in sliding tests with alumina ball. They show coefficient of friction of 0.1 and below at RT and wear of the diamond composites is hardly detected. Effects of diamond grit size, diamond content and test temperature on the coefficient of friction and the wear are discussed. The wear scars were analyzed.