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Multi-Level을 사용한 PDP 구동회로에서 Timing 변화에 따른 특성 변화에 관한 연구
김중수(J. S. Kim),강순은(S. E. Kang),송석호(S. H. Song),노정욱(C. W. Roh),홍성수(S. S. Hong),사공석진(S. C. Sakong) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
Proposed Multi-level PDP sustain Driver make use of element which has a low voltage rating instead of suggested method by the existing Webber and it passes through a second phase both rising and falling at sustaining voltage waveform. In accordance with the change of timing phase(Tr1, Ti1, Tr2) performance comparison of a electric discharge characteristics in a PDP module has been carried out. At the conclusion of experimentation, the feature is extended by alteration of Ti1 and it has little to do with alteration of Tr1.
피스톤링의 회전운동이 오일소모에 미치는 영향 -제1보 : 피스톤링의 회전운동 측정-
김중수(J.S.Kim),민병순(B.S.Min),오대윤(D.Y.Oh),최재권(J.K.Choi),진준하(J.H.Jin) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
The rotational movements of piston rings were measured by a radiotracer technique in a single cylinder engine. In order to measure the rotation of the top and 2'nd ring simultaneously, two kinds of isotopes, ^60Co and ^192Ir, were used and mounted in each rings. 3 NaI γ -ray detectors were used to measure y -ray intensities. While motoring the assembled engine, the y -ray intensities were measured with the ring gap fixed at a certain angle, and as a result of repeating this procedure, the relationship between the gap angle and y -ray intensities was calculated. Based on this calibration results, algorithm was made to determine the gap angle from the measured y -ray intensities and the uncertainties was below 8° . As results of the experiment, it was known that the movement of each ring isn't dependent on the other ring and also isn't regular at same operating condition. The rotational speed was within the range of 0.2~0.4 rev/min. Even though the movement patterns were arbitrary at the same condition, the tendency was found that the ring can rotate easily at low load condition.<br/>
이종흔(J. H. Lee),김중수(J. S. Kim),김제훈(J. H. Kim),장일무(I. M. Chang) 한국생약학회 1980 생약학회지 Vol.11 No.1
Siegesbeckia pubescens, $quot;Hi-cheom$quot;, has long been used for antihypertensive agent as a folkloric drug in Korea. Recently, the Compound B, one of diterpene compounds were isolated and determined its chemical structure. The present study is aimed to evaluated antihypertensive activities of the Compound B against the animal model of high blood rat, Okamodo-SHR. The Okamodo-SHR rats were divided into three groups. One group as a control received propranolol, known β-Blocker and the other two group received the Compound B with dose ranges from 20∼50㎎/㎏/day. The blood pressure of rats were measured by using electro-spygmograph having special attachment of pneumatic pulse transducer. It was noted that the Compound B appoared to possess the antihypertensive activities.
피스톤링의 최전운동이 오일소모에 미치는 영향 -제2보 : 링갭의 위상각과 오일소모와의 관계-
민병순(B.S.Min),김중수(J.S.Kim),오대윤(D.Y.Oh),최재권(J.K.Choi),진준하(J.H.Jin) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
In order to understand the relationship between the phase angle of piston ring and oil consumption, the ring rotation and instantaneous oil consumption were measured at the same time. The ring rotation was measured by radio-tracer technique. The instantaneous oil consumption was measured by analyzing CO₂ concentration in exhaust gas. The use of hydrogen fuel not gasoline makes this possible because all of the carbon component in exhaust gas can be assumed to be produced from oil. As a result of experiment, it is known that the oil consumption varies periodically and a specific location of ring end gap was found at each peak of oil consumption. Therefore, it was found that the oil consumption was not constant even at the same operating conditions and this is because the relative locations of top and 2'nd ring end gap change arbitrarily.<br/>
민병순(B.S.Min),김중수(J.S.Kim),최재권(J.K.Choi) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
The effect of spray jet and gallery cooling were studied in 3 types of engines, gasoline engine, direct injection diesel engine and indirect injection diesel engine, by measuring piston temperatures with and without cooling devices, spray jet and cooling gallery. As a result of the measurement, it is shown that the cooling effect of spray jet of gasoline engine is larger than that of diesel engine and the effect of cooling gallery of indirect injection diesel engine is larger than that of direct injection diesel engine. The different characteristics of piston design according to the engine types makes the cooling effect different from each other. Therefore, the characteristics of piston design should be considered when determining the most appropriate piston cooling method.<br/>
민병순(B.S.Min),김중수(J.S.Kim),최재권(J.K.Choi) 한국자동차공학회 1996 한국자동차공학회 학술강연초록집 Vol.1996 No.10
In order to investigate the relationship between the ring gap ratio and oil consumption, the axial motion of piston ring was measured by capacitance technique. The pressures of each land and the motions of each rings were calculated by orifice-volume method in which it is assumed that the ring gaps are the only gas leakage paths. The calculated results were compared with the measured ones. Consequently, it is known that the increase of ring gap ratio has the effect of lifting the l' st ring. The calculated results were roughly in accord with those of measured. Therefore, it is possible to predict the effect of design variables on the pattern of ring motion. It is known that the lift off of l' st ring accompanied by the increase of ring gap ratio make rise of oil comsumption.