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계단 오르기 과제에서 대학 레슬링 선수와 배구선수의 동작 유도성 지각
황상순(Sang Soon Hwang),최승오(Seung Oh Choi),김동환(Dong Hwan Kim),박현철(Hyun Chul Park) 한국사회체육학회 2010 한국사회체육학회지 Vol.0 No.40
Evidence utilizing an ecological approach to perception (Gibson, 1979; Warren, 1984) suggests that perceivers can grasp relation between information that environment gives and the action they afford in the environment. The purpose of the present study was to examinate how biomechanical limitation is perceived in according to exercise ability in different exercise types and to see if lower limb length affects optimal perception- and achievement-levels. Participants were wrestling (n=10) and volleyball (n=10) collegiate players whose motion-induced perception was measured using a stair climbing task. Statistical analysis was determined using t-test, regression analysis, and results were expressed as mean±standard deviation. Differences were considered significant if p<0.05. The results of this study demonstrated that the affordance to perception between the groups was not significantly different, suggesting that affordance is influenced by participant`s biomechanical limitation such as flexibility in the judgement of optimal perception level. The results were discussed via an ecological perspective.
GDL Permeability에 따른 고분자 전해질 연료전지의 물질전달 및 열전달 특성에 관한 연구
한상석(Sang Seok Han),이필형(Pil Hyong Lee),박창수(Chang Soo Park),이재영(Jae Young Lee),황상순(Sang Soon Hwang) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Among the main components of PEM fuel cell, the functions of GDL are to transport reactants from the channel to the catalyst and remove reaction products from the catalyst and transport heat from the catalyst to the channels in the flow filed plate. Permeability of GDL is known to make it possible to enhance the gas transport through GDL, devoting to get better performance. In this paper, three dimensional numerical simulation of the fuel cell by the permeability of GDL is presented by using a FLUENT modified to include the electrochemical behavior. Results show that as permeability is higher than 10?¹²㎡, gradients of temperature distribution, oxygen molar concentration and current density distribution in MEA were decreased. Although heat generation was increased as high permeability, MEA's temperature was lower than the low permeability of GDL. This seems because that convection was higher affects in mass and heat transfer process than diffusion as permeability of GDL is increases.
유동방향 변화에 따른 고분자 전해질 연료전지의 성능 및 전달특성에 대한 3차원 수치해석적 연구
이필형,한상석,황상순,Lee, Pil-Hyong,Han, Sang-Seok,Hwang, Sang-Soon 한국전기화학회 2008 한국전기화학회지 Vol.11 No.1
Many researches for effects of different flow configurations on performance of Proton Exchange Membrane Fuel Cell have extensively been done but the effects of flow direction at the same flow channel shape should be considered for optimal operation of fuel cell as well. In this paper a numerical computational methode for simulating entire reactive flow fields including anode and cathode flow has been developed and the effects of different flow direction at parallel flow was studied. Pressure drop along the flow channel and density distribution of reactant and products and water transport, ion conductivity across the membrane and I-V performance are compared in terms of flow directions(co-flow or counter-flow) using above numerical simulation method. The results show that the performance under counter-flow condition is superior to that under co-flow condition due to higher reactant and water transport resulting to higher ion conductivity of membrane. 고분자 전해질 연료전지의 성능향상을 위한 방법으로 유동채널의 형상을 변경한 많은 연구가 진행되어 왔으나 동일한 유동채널 형상에서 유동방향 변경에 따른 연구는 많이 진행되지 못하였다. 본 연구에서는 동일한 반응면적과 동일한 유동채널의 고분자 전해질 연료전지의 수소와 산소의 유동방향을 Co-flow에서 Counter-flow로 변경될 경우의 연료전지의 성능변화를 분석하기 위하여 연료극과 공기극이 포함된 3차원 수치해석모델을 개발하였다. 개발된 수치해석모델을 활용하여 Co-flow와 Counter-flow의 유동채널 내부의 압력손실, 반응물질의 농도분포, 고분자 전해질 막을 통한 Water Transport, 고분자 전해질 막의 이온전도도 및 I-V 성능곡선을 비교하였다. 그 결과 반응물질의 농도분포, Water Transport, 고분자 전해질 막의 이온전도도가 우수한 Counter-flow 유동조건에서의 성능이 Co-flow 유동조건에 비하여 더욱 우수하였다.