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차량용 램프 내열 온도 예측을 위한 CFD 해석 및 알고리즘 개발
서성원,김영완,이권영 한국자동차공학회 2023 한국 자동차공학회논문집 Vol.31 No.7
The heat generated by the bulbs in automotive lamps is transferred to the reflector and lens of the lamp through the heat transfer mechanism. If the heat transferred to the reflector and lens exceeds the heat resistance limit of the materials used in their production, deformation occurs. Therefore, designers must design lamps within a limited range, and if the lamps fail to pass the heat resistance test after design and production, the design process must be restarted from the beginning, which incurs considerable time and cost. By using a heat resistance prediction program, designers can save a significant amount in terms of time and cost that were previously required during the design-heat resistance test phase. Therefore, in this study, we sought to understand the temperature characteristics of lamps based on the heat transfer mechanism, using computational fluid dynamics(CFD) results for the development of a high-accuracy temperature prediction program for automotive lamps. We designed box-shaped lamps considering the size range of the actual manufactured lamps and using the heat transfer mechanism. The relationship between the maximum temperature of each surface obtained through CFD and the main factors including the size of the box, power of the bulb, and ambient temperature were verified. Based on these results, we developed a single-function lamp temperature prediction algorithm.
徐成源 서울産業大學校 1986 논문집 Vol.24 No.1
Nowadays, Ships are becoming more high speedy and large-sized. Therefore, the fatigue strength of propeller vane should be considered in ship design. The Ni.Al-bronze, Mn-bronze and Al-bronze are used as materials of propeller vane. In this paper, the fatigue strength and mecanical properties of them are studied. The testers used to test are Amsler, Rockwell hardness tester, and Ono-type rotary bending fatigue tester.
徐成源 서울産業大學校 1971 논문집 Vol.4 No.1
In the case of former condenser-refrigerator, according as its capacity diminished, volume efficiency, condensing efficiency and mechanical efficiency dropped and coefficient of performance also dropped. Thermo electrical refrigerator in the recent, however, is more favorable than condensing refrigerator when small capacity refrigeration is required, for its coefficient of performance has nothing to do with its capacity. Further more, as there is no other mechanical system in thermo-electrical refrigerator, breakdown, vibration and noise will not be made by using up. And as there is no refrigerant, conduit system, there will be no problems about gas leakage and corrosion either. Moreover the refrigeration capacity can be easily controlled by changing amperage and heating also, can be generated by reversing the currency direction. Semi-conductor, the nucleus of thermo-electrical refrigerator and the electric circuit connecting it will be introduced here.
서성원,강현욱,류현승 한국웰니스학회 2012 한국웰니스학회지 Vol.7 No.1
The purpose of this study was to examine the relationship among the University??Taekwondo coaches' leadership efficiency, coaches' reliability, and players' satisfaction. The participants of??this study were University Taekwondo players who are officially registered at the Korean Taekwondo Association.??Samples of 400 questionnaires by convenience sampling were used as final research materials. The??statistical techniques, which were used for the analysis of this study, were frequency analysis, exploratory factor??analysis, reliability analysis, correlation analysis, and multiple regression analysis, by using SPSS 15.0. Through??these procedures, the following conclusions were elicited. First, coaches' leadership efficiency was found to have a positive effect on reliability in??a coach. Two variables of leadership efficiency-perceived improvement in function and perceived satisfaction??with leadership were found to have a great influence on players' satisfaction. Particularly, satisfaction with??perceived guidance was found to have the biggest influence on players' satisfaction with carrying out their assignments,??which are the five variables of the reliability in a coach-sincerity, competency, consistency, altruism, and??openness, which suggests that coaches' efficient guidance is important to players for their improvement in function??and performance. Second, reliability in a coach was found to a positive effect on players' satisfaction,??especially the biggest influence on satisfaction with carrying out assignments, which also suggests that??coaches' ability is important in order for players to get satisfaction with their performance of certain assignments. Third, coaches' leadership efficiency was found to have a positive effect on a suggests??that a coach is important in increasing satisfaction with carrying out players' assignments.