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황찬연(C. Y. Hwang),양윤석(S. k. Yun),유영태(Y. T. you) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
Laser surface hardening technologies have been used to improve characteristics of wear and to enhance the fatigue for mold materials. The objective of this research work is to investigate the influence of the process parameters, such as power of laser and focus position, on the characteristics of laser heat treatment for the case of STD11 high carbon steel. In addition, using the heat treatment optical lens and then analyzed of the characteristics of STD11 high carbon steel.
유영태,김지환,정지철 조선대학교 생산기술연구소 1997 生産技術硏究 Vol.19 No.1
It is very important to measure pressure and discharge in the field of engineering or technology of the science because the flow of pipe line furnished in industrial field is mostly unsteady flow. Thus, this paper is to analyze the pressure wave of pulsating flow for stable operation and power transmission of hydraulic apparatus experimentally and theoretically. The velocity and pressure of average area is appeared as the function of angular velocity due to increase of axial distance in pipe line. Phase angle is not varied in low frequency region, but phase difference is as the frequency increases. Also, the variation of phase angle is greatly appeared as the frequency increases the wave length shortens, and kinetic energy increases. Thus, energy and mass transfer increase.