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New C-Leg의 기능 분석을 통한 지능형 의지시스템의 발전 현황
이성욱(S. U. Lee),김석윤(S. Y. Kim),이영삼(Y. S. Lee) 한국재활복지공학회 2011 한국재활복지공학회 학술대회논문집 Vol.2011 No.11
This paper examine developments of intelligent prosthesis system by analysising founction of New C-Leg is made by Otto Bock in Germany. At first, it will describe gait pattern of normal people, and that will describe methode of appling in New C-Leg. Second, it will introduce C-soft that is finely changing movement with matching users habit. At least, it will describe mode change about exercise.
DC 모터 기반의 능동형 의족 시스템 프로토 타입 개발 및 제어
김원식(W. S. Kim),김석윤(S. Y. Kim),이영삼(Y. S. Lee) 한국재활복지공학회 2013 한국재활복지공학회 학술대회논문집 Vol.2013 No.10
In this paper, we describe the structure of a lab-built powered knee prosthesis, developed as a protype, and deal with the control of it. The prosthesis is built on the basis of previous researches and it adopts the slider-crank mechanism to manipulate the knee joint. We divide the gait phase into five stages and use a finite state machine (FSM) to generate a torque reference needed for each stage. We also propose to use a position-based impedance controller for driving the powered knee prosthesis stably. We perform some walking experiments at fixed speeds in order to show the features of the built powered prosthesis. The experimental results show that our prosthesis exhibits similar knee angle trajectories to those of healthy people.
김재윤,김경식,김석윤 ( J . Y . Kim,K . S . Kim,S . Y . Kim ) 한국열처리공학회 1996 熱處理工學會誌 Vol.9 No.4
The direct reaction method has been used for the fabrication of Al-Mg/Al₂O₃functionally gradient materials. It was found that the reaction layer of the Al-Mg/Al₂O₃powder compact at 900℃ under air atmosphere led to the formation of reaction layers with varying ceramic phase contents. As the results of experiments by using the TGA system, the characteristics and growth behavior of the reaction layers were affected by the reaction temperature, the gas flow rate, the Mg contents and the Al₂O₃contents.
W 섬유강화 Al합금기지복합제의 열cycle에 따른 계면거동에 관한 연구
허재근,김정태,현창용,김용석,김석윤 ( J . G . Huh,J . T . Kim,Ch . Y . Hyun,Y . S . Kim,S . Y . Kim ) 한국열처리공학회 1994 熱處理工學會誌 Vol.7 No.3
The reaction layer formed at interface between matrix and fiber has significant effects on the mechanical properties and behaviors of deformation in FRM. In this study, the mechanical properties and interfacial behaviors according to surface finishing on the fibers and according to heat treatment in FRM were investigated. FRM was fibricated by diffusion bonding method. In W/Al alloy composite and W/Al composite, W of which was coated with WO₃, the heat treatment was carried out thermal cycling method from 373K to 673K. In W/Al composite, W of which was coated with WO₃, growth of interface layer was hardly occured in spite of the increasing various thermal cycles. It was exhibited that oxidized W/Al composite were higher strength than non-oxidezed W/Al composite with the increasing thermal cycles. The compounds of fiber/matrix interface were analyzed into WAl_(12), WAl_5 and AlWO₃, respectivly. Therfore the interfacial compounds of fiber/matrix seriously affected the mechanical properties and behaviors of deformation in FRM.
최진용,최진혁,김석윤,Choi, J.Y.,Choi, J.H.,Kim, S.Y. 한국해양학회 1999 바다 Vol.4 No.3
퇴적물 입도분석 방식에 따른 분석결과의 편차를 비교하였다. 한반도 주변해역에서 기존에 보고된 퇴적물 입도자료들은 연구기관에 따라 상당한 편차가 나타났으며, 실험실간 편차보정작업(Inter-lab calibration)이 요구된다. 퇴적물 입도분석 결과는 분석방식에 따라 상이하게 나타났다. 레이저 회절방식은 반복측정의 정확도가 매우 우수하였지만, 2-3 ${\mu}m$보다 세립한 계층의 함량을 과소측정하였다. 이와 반면에 입자침전속도에 근거한 입도분석 방식은 조립실트(5-6 ${\phi}$) 계층의 오차가 크게 나타났으며, 점토질 함량이 다소 과다하게 측정되었다. 퇴적물 입도분석에 가장 일반적으로 활용되는 체질과 피켓법은 0.5 ${\phi}$ 간격의 분석작업이 가장 효과적인 것으로 나타났다. 특히 피켓법의 경우 조립실트 계층의 영역에서 0.5 ${\phi}$ 간격의 분석작업이 요구되었다. 또한 사질 퇴적물의 체질방식에서는 하나의 체에 걸러지는 퇴적물 양에 따른 오차가 매우 중요한 것으로 나타났다. Grain size distributions of sediment samples were analyzed by the different methods, and the results were compared. Reported data of the bottom sediments from the Korean seas show significant deviations among the institutes, and the inter-lab comparison and calibration procedures are considered to be necessary. Grain size data by different methods show different results. Laser diffraction method provides good precision in replicate analysis, but underestimates the amounts of finer (smaller than 2-3 ${\mu}m$) fraction. Data from particle settling method, on the other hand, represent significant errors in the coarse silt (5-6 ${\phi}$) fraction, and slightly overestimate the clay fraction. In the sieve and pipette methods, best results were taken in 0.5 ${\phi}$ interval of analysis. Especially in the coarse silt fraction, pipette analysis is suggested to be made with 0.5 ${\phi}$ interval. During the dry sieving procedure in 1 ${\phi}$ interval, serious errors occur when large amounts of sample materials were concentrated in a particular sieve.
Al2O3 섬유강화 Al-Li 복합재료의 기계적 성질과 계면반응
김석윤,김정근 대한금속재료학회(대한금속학회) 1991 대한금속·재료학회지 Vol.29 No.2
Metal matrix composites(MMC) reinforced on Al₂O₃ fibre are gaining increasing attention for structural application. However, the data base concerning its mechanical properties and microstructural characterization remains limited. Al₂O₃ fibre(FP-fibre from Dupont) reinforced Al -2.5Li composite has been investigated in the present study. Continuous fibre Al₂O₃/Al-2.5Li composites with the 0°and 90° direction were used for the investigation. Processing of the material was performed by vacuum melt infiltration. Tensile and compressive tests were performed for mechanical characterization. In order to get sufficiently good results, a special MMC related test equipment was designed. The best results were achieved when cylindrical hourglass shaped specimens were used. Fatigue testing of the metal matrix composites showed that a pronounced improvement of the fatigue behaviour could be achieved with the fibre reinforcement. Transmission electron microscopy was performed in order to study the fibre/matrix interface. Li addition increased the wettability of the fibre in the matrix, because of the formation of two compounds in the interfaces, namely, α-LiAlO₂ and LiAl_5O_8 spinel. Precipitation free areas around the fibres containing any δ'particles, which in turn are present in the matrix, were found.
양훈영,김석윤 대한금속재료학회(대한금속학회) 1970 대한금속·재료학회지 Vol.8 No.2
Effect of electrode covering on the mechanical properties of high tension steel weld has been investigated with domestic covered electrodes and prepared electrodes with various ingredients. Fluxing materials in the heavily covered electrode give the arc considerable stability, help to float out impurities from within the molten puddle, and develop inert gases which keep the outer surfaces of the molten weld from oxidizing. An addition of 1∼2% graphite in the electrode covering increases strength of the weld metal resulting from carburizing effect, whereas a larger amount of graphite (3∼5%C) makes it brittle causing CO gas blow hole formation. Excess amount of manganese in the covering materials may cause harmful effect, forming fish eye. Addition of iron also results in strength increment and gives the arc stability. Molybdenum produces superior strength and appearance of the weld metal and gives better weldability. It is, therefore, suggested that an addition of ferro-molybdenum to the covering materials would help to produce sound weld for high tension steel.