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김수성(Soo Seong Kim),이상익(Sang Ik Lee),김철환(Chul Whan Kim) 대한금속재료학회(구 대한금속학회) 1986 대한금속·재료학회지 Vol.24 No.2
The formability of 0.4mm and 0.6mm thick Al alloy 3003 sheet that had been double cold rolled and annealed was evaluated by analyzing its uniaxial tensile behavior, forming limit curve (F.L.C.), pole figure analysis, and earing behavior. The F.L.C. level of Al alloy 3003 sheet was considerably lower than those of the low carbon steels (Keeler-Goodwin Band). As the thickness of sheet increased, the F.L.C. level of Al alloy 3003 sheet became higher. The experimental strain ratio (R-value) was compared well with the theoretical R-value calculated by the Lee-Oh method, and the cup made an earing in the direction of the high R-value. It was found that the earing height decreased when the mixture of rolling and annealing textures developed.
콤바인의 자동제어에 관한 연구(I) -자탈형(自?型) 콤바인의 주행방향제어(走行方向制御)-
정창주,김성옥,김수성,Chung, Chang-Joo,Kim, Seong-Ok,Kim, Soo-Sung 한국농업기계학회 1988 바이오시스템공학 Vol.13 No.2
This study was intended to develop the system automatically controlling travel direction of combine by means of sensing paddy rows. The control system was composed of three detecting levers having different length, micro-switch, microcomputer and electro-hydraulic control system. Sensor and control system developed was tested to estimate optimum design values and its actual performance as installed in combine. The computer simulation and performance test at simulated and actual field were conducted to test for possibility of practical use. The results of the study arc summarized. as follows: 1. The travel traces of combine hiving the conventional sensor with 2 levers and the new sensor detecting the slope of paddy rows were compared through computer simulation. Turning frequency of combine having new sensor was fewer than that of conventional sensor, but the rate of turning for the combine with new sensor was much greater than that of conventional sensor. 2. As sensor was established behind the tip of divider, the sensor itself well followed paddy rows but the tip of divider did not, resulting in divider being deviated from paddy rows. It was analyzed that the sensor should be attached closer to the tip of divider to have a better performance of the control system. 3. The greater the length of sensor lever for given location of sensor attachment and combine forward speed, the higher sensitivity of turning in control system. Moreover, increasing combine speed resulted in a worse performance of control system following paddy rows. Consequently, it was necessary that an optimum length of sensor attachment and for the range of combine operational speed. 4. Field test of combine installed with the sensor and electro-hydraulic system developed in this study showed that it may be operated smoothly and well behaved to paddy rows to 4th gear of combine speed which was 59cm/s. Consequently. it was concluded that the combine with the guidance control system developed in this study may be successfully used for paddy combining.
하민우(Min-Woo Ha),김수성(Soo-Seong Kim) 대한전기학회 2021 전기의 세계 Vol.70 No.12
전력용 반도체 소자는 전 영역에 온 전류가 고르게 퍼지는 수직형 구조가 적합하다. 하지만 수직형 전력용 반도체 소자 내 액티브 영역의 끝인 메인 접합에 역방향 전계가 집중되어 항복 전압이 열화된다. 이 문제를 개선하기 위하여 액티브 영역을 감싸는 접합 마감 영역이 필요하다. 이 글에서는 실리콘과 4H-SiC 기반 전력용 반도체 소자의 접합 마감 기술에 대하여 설명하였다. A power semiconductor device is suitable for a vertical structure in which on current is evenly spread over the entire region. However, the reverse electric field is concentrated at the main junction, the edge of the active region in the vertical power semiconductor device, and the breakdown voltage is decreased. In order to improve this problem, a junction termination region encircling the active region is required. In this article, the junction termination technologies for silicon and 4H-SiC-based power semiconductor devices were discussed.