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3차원 메쉬에서의 최적 all - to - all 방송 알고리즘
이재하(J.H. Lee),좌경룡(K.Y. Chwa) 한국정보과학회 1994 한국정보과학회 학술발표논문집 Vol.21 No.1
방송(broadcasting)이란 한 노드에서 다른 모든 노드로 메세지를 보내는 것을 말한다. 그리고, all-to-all 방송이란 모든 노드로부터의 동시 방송, 즉 모든 노드로부터 다른 노드로 메세지를 보내는 것을 말한다. 본 논문에서는 3차원 메쉬에서의 all-to-all 방송 알고리즘을 제시한다. 이 알고리즘은 여분의 공간을 필요로 하지만 임의의 3차원 메쉬에서 최적의 수행시간을 가진다. 그리고, 3차원 메쉬의 all-to-all 방송에 이용하기 위해 새로운 2차원 메쉬에서의 all-to-all 방송 알고리즘을 사용하였다.
이응삼(E. S. Lee),이재하(J. H. Lee),양승한(S. H. Yang) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
In this paper, an efficient method is proposed to analyze the radial error of a miniaturized-high speed spindle system. Initially, a device is constructed for measuring the radial error motion using capacitance sensors. The capacitance sensors are placed perpendicular to the axis of the shaft and at 90° to each other. The spindle is rotated at high speed and the profile of the spindle is recorded. An algorithm is developed for analyzing the spindle data and determining the radial error of spindle. The present algorithm uses homogeneous transform matrix (HTM) method and iterative process for determining the radial error. The analysis procedure is performed for different speeds of the spindle. The data obtained from the present system and the results of evaluation are also presented in this paper. It is observed that this method is effective in determining and analyzing the spindle errors for high speed miniaturized spindle.
이재하,김영근,이이근 한국부식학회 1991 Corrosion Science and Technology Vol.20 No.4
Industrial application of Zn-Mn alloy electroplated film with inherently superior natures in brightness and corrosion resistance is limited due to its low current efficiency. It is reported, however, that additives such as selenious acid, sodium thiosulfate and thiourea enhance the current efficiency in Zn-Man aVoy electroplating. The effects of those additives on electrodeposition behavior of Zn-Mn alloy were studied by analysing polarization curves of Zn-Mn, Zn and Mn deposition in sulfate baths containing sodium citrate, and electrodeposited surface were scanned by x-ray diffractometer and SEM. Electrodeposition of Zn-Mn alloy in sulfate baths containing sodium citrate showed normal behavior of codeposition and low current efficiency. On the other hand, it was seen than partial polarization curves of Zn were smooth and current density of Mn at high cathodic potential increased in sulfate baths containing the additives described above. The additives were found to improve the current efficiency, and the effect of selenious acid and sodium selenite was especially remarkable. XRD and SEM analyses on Zn-Mn alloy electrodeposition showed that these additives played an important role in changing the alloy phase from epsilon to gamma, and decreasing the grain size of deposit.