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권윤기,이건호 한국유체기계학회 2006 한국유체기계학회 논문집 Vol.9 No.2
This paper was studied to design process considered flexibility and reliability of suction and discharge valves. Flexibility and reliability of valves are main important factors in compressor valves design. And they are incompatible with efficiency of compressor. In this study, we have performed the optimal design of CO2 compressor valves to consider these factors. At first, we analyzed performance simulation of compressor to obtain optimal flexibility level of valves. From this simulation, we could get some important data at valve design like the optimal natural frequency and the height of retainer. After that we studied to reliability of valves corresponding to optimal flexibility level by finite element method. For each case bending stress and natural frequency were obtained by it. Also we investigated the fatigue stability to obtain optimal valve shape that ensured to reliability.
권윤기 ( Yun Ki Kwon ),권순학 ( Soonhak Kwon ),김창훈 ( Chang Hoon Kim ),김희철 ( Hiecheol Kim ) 한국정보처리학회 2009 한국정보처리학회 학술대회논문집 Vol.16 No.1
최적정규기저(Optimal Normal Basis)를 이용한 GF(2m)상의 곱셈은 ECC(Elliptic Curve Cryptosystems: 타원곡선 암호시스템) 및 유한체 산술 연산의 하드웨어 구현에 적합하다는 것은 잘 알려져 있다. 본 논문에서는 최적정규기저의 하드웨어적 장점을 이용하여 합성체(Composit Field)상의 곱셈기를 제안하며, 기존에 제안된 합성체상의 곱셈기와 비교 및 분석한다. 제안된 곱셈기는 최적정규기저 타입 I, II의 대칭성과 가수의 중복성을 이용한 열벡터의 재배열에 따른 XOR 연산의 재사용으로 낮은 하드웨어 복잡도와 작은 지연시간을 가진다.
최적 정규 기저 타입 I을 이용한 GF(2<SUP>m</SUP>)상의 효율적인 비트-시라얼 곱셈기
권윤기(Yun Ki Kwon),김창훈(Chang Hoon Kim),권순학(Soonhak Kwon),황병곤(Byung Kon Hwang) 한국멀티미디어학회 2008 한국멀티미디어학회 학술발표논문집 Vol.2008 No.2
최적 정규 기저 타엽 I을 이용한 GF(2<SUP>m</SUP>)상의 곱셈 연산은 하드웨어 구현에 적합하다. 본 논문에서는 최적 정규 기저 타입 I을 이용한 비트-시리얼 곱셈기를 제안한다. 제안된 곱셈기의 최대 처리가 지연 시간은 T<SUP>A</SUP>+2TD으로 m클럭마다 곱셈 결과를 출력하며, m개의 AND 게이트와 3m/2개의 XOR 게이트 3m개의 플립-플롭으로 이루어진다. 제안된 곱셈기는 기존의 곱셈기에 비해 낮은 최대 처리기 지연 시간과 낮은 하드웨어 복잡도를 가진다.
무 윤활 상태에서 코팅에 따른 자동차 에어컨용 압축기 사판 표면의 마모 특성
권윤기(Yunki Kwon),이건호(Geonho Lee) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In this study, the tribological characteristics of the swash plate surface of a compressor were investigated. For surface treatments, PTFE and MoS₂ are used as a solid lubricant, together with copper alloy. Test condition is set considering actual driving condition. Wear testing is conducted using pin on disk type tester, and the coefficient of friction and the temperature on friction surface are measured. Also, to determine the wear patterns, cross-section of friction surface is analyzed by SEM(scanning electrode microscope). In case of MoS₂, friction surface and the coefficient of friction maintained rather stable results. But, in case of PTFE, at oil less condition, resulted in rather unstable condition. In case of copper alloy, quite higher friction coefficients(higher than 0.1) were obtained at dry condition. At the temperature of 125℃, seizure has occurred.
자동차 에어컨용 압축기 사판의 표면 형태에 따른 마찰 마모 거동
권윤기(Yunki Kwon),이건호(Geonho Lee),이기천(Kichun Lee) 한국트라이볼로지학회 2011 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.27 No.2
The tribological characteristics of the swash plate surface of a compressor which is for automobile were investigated. For surface treatments, PTFE and MoS2 are used as a solid lubricant, together with copper alloy. Test condition is set considering actual driving condition. Wear testing is conducted using pin on disk type tester, and the coefficient of friction and the temperature on friction surface are measured. Also, to determine the wear patterns, cross-section of friction surface is analyzed by SEM(scanning electrode microscope). The MoS2, both at dry and lubricated conditions, friction surface and the coefficient of friction maintained rather stable results. But, the PTFE, at oil less condition, sample resulted in rather unstable condition. In case of copper alloy, quite higher friction coefficients(higher than 0.1) were obtained at dry condition. At the temperature of 125oC, seizure has occurred.
송삼홍,권윤기 대한기계학회 1995 대한기계학회논문집 Vol.19 No.2
Single overload tests performed to examine the crack retardation behavior for the specimen thickness and overload ratios. Delayed crack length was tend to increase in small thickness and big overload ratio but was difference between delayed crack length and plastic zone size that expected in specimen thickness. So retardation behavior that estimated in plastic zone size, was not sufficient. Crack tip branching and striation distribution, secondary mechanisms that effected in retardation behavior, was examined by experiment and finite element analysis. Crack tip branching was affected by micro structure, and appeared the more complicatedly according to increasing damage by overload and decreasing crack driving force in base line stress level. And crack tip branching the branching angle decreased crack driving force in the crack tip. And a characteristic of the fractography on retardation zone was that striation distribution did not appear due to decreased crack driving force.