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김유신(Y.S Kim),전창훈(C.H Jun),김명훈(M.H Kim),최형식(H.S Choi) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
This paper aims at the development of shoes measuring the performance of walking or running, which is<br/> equipped with electronic devices. In the in-sole of the shoes, a piezoelectric sensor is inserted for measuring<br/> the number of steps and the speed of walking. The measured signals are processed by the one-chip microprocessor<br/> and related electronic devices. Using the data, the momentum and calories of walking and running<br/> are calculated, and the results are transmitted to the displaying system composed of LCD by the RF<br/> telecommunication system.
반응면 기법을 이용한 초음속 전투기 날개의 다학제간 다점 설계
김유신(Y. S. Kim),김재무(J. M. Kim) 한국전산유체공학회 2004 한국전산유체공학회 학술대회논문집 Vol.2004 No.-
In this study, the multidisciplinary aerodynamic~structural optimal design is carried out for the supersonic fighter wing. Through the aeroelastic analyses of the various candidate wings, the aerodynamic and structural performances are calculated such as the lift coefficient, the drag coefficient and the deformation of the wing. In general, the supersonic fighter is maneuvered under the various flight conditions and those conditions must be considered all together during the design process. The multi-point design, therefore, is deemed essential. For this purpose, supersonic dash, long cruise range and high angle of attack maneuver are selected as representative design points. Based On the calculated performances of the candidate wings, the response surfaces for the objectives and constraints are generated and the supersonic fighter wing is designed for better aerodynamic performances and less weights than the baseline. At each design point, the single-point design is performed to obtain better performances. Finally, the multi-point design is performed to improve the aerodynamic and structural performances for all design points. The optimization results of the multi-point design are compared with those of the single-point designs and analyzed in detail.
압력조건의 변화에 따른 PEMFC의 성능 시뮬레이션 및 설계에 관한 연구
김홍건(H. G. Kim),김유신(Y. S. Kim),김홍열(H. Y. Kim),양성모(Y. M. Yang),나석찬(S. C. Nah) 한국생산제조학회 2005 한국생산제조시스템학회 학술발표대회 논문집 Vol.2005 No.10
Fuel cells are devices that convert chemical energy directly into electrical energy. Among many kinds of the fuel cell, Polymer electrolyte membrane fuel cell is such kind of thing which work under low temperature. Unfortunately, there are still many problems to be solved in order to make them into commercial use, such as the thermal and water management in working process of Polymer electrolyte membrane fuel cell. To solve the difficulties facing the researcher, the analysis of the inner mechanism of Polymer electrolyte membrane fuel cell should be implement as much as possible, mathematical modeling is an important tool for the reach of the fuel cell especially with the combination of experiment. By regarding some of the assumptions and simplifications, using the finite element technique, a two-dimensional electrochemical mode is created in this paper for the further comparison with experiment data. Based on the principals of the problem, the equation of electronic charge conservation equation, gas-phase continuity equation, and mass balance equation are used in calculating. In the end, the model results indicate the some of the phenomenon in the unit cell, and the relationships of potential and current density.
김홍건(H. G. Kim),김유신(Y. S. Kim),김홍열(H. Y. Kim),양성모(Y. M. Yang),나석찬(S. C. Nah) 한국생산제조학회 2005 한국생산제조시스템학회 학술발표대회 논문집 Vol.2005 No.5
An experimental study is performed to evaluate the performance and the efficiency by humidifying MEA and by making the double-tied catalyst layers in a fuel cell system which is taken into account the physical and thermal concept. An electrical output produced by PEFC(polymer Electrolyte Fuel Cell) is measured to assess the performance of the stack and the efficiency is also evaluated according to the different situation in which is placed with and without the humidification of MEA(Membrane Electrolyte Assembly). Subsequently, It is found that the measured values of stack voltage and current are influenced by the stack temperature, humidification, and the double-tied catalyst layers which gives more enhanced values to apply for electric units.
고분자 전해질 연료전지의 개방회로 전위차 측정 및 분석
김흥건(H. G. Kim),김유신(Y. S. Kim),김흥열(H. Y. Kim) 한국생산제조학회 2004 한국생산제조시스템학회 학술발표대회 논문집 Vol.2004 No.10
The discrepancies between theoretical values and measured data of PEFC(Proton Exchange Fuel Cell) is carried out for the machine tool power generation. Rudimental approach of theoretical fuel cell open circuit potential using Gibbs free energy is employed for the examination of PEFC module. The stack temperature, stack voltage and stack current are measured during the operation of PEFC module. It is found that stack voltage and current values show the pronounced discrepancy with the results calculated by Gibbs free energy approach. It is analysed that the discrepancy is due to activation polarization, concentration overvoltage and ohmic overvoltage.
김홍건(H. G. Kim),강영우(Y. W. Kang),김유신(Y. S. Kim) 한국생산제조학회 2004 한국생산제조시스템학회 학술발표대회 논문집 Vol.2004 No.4
The main objective of the present study is to analyze the feasibility of fuel cell powered vehicle, which leads to carry out system design and performance analysis. The major design concepts which include battery, driving motor, and fuel cell module are analyzed and discussed for the future development. The traction power of fuel cell vehicle is calculated according to the driving courses specified. Further, the fuel cell stack is analyzed to determine the capacity of stack as a function of velocity for the appropriate power required.