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평판형 고체산화물 연료전지 표면균열거동에 관한 수치해석
박철준 ( Cheol Jun Park ),권오헌 ( Oh Heon Kwon ),강지웅 ( Ji Woong Kang ) 한국안전학회(구 한국산업안전학회) 2018 한국안전학회지 Vol.33 No.5
A fuel cell is an energy conversion device that converts a chemical energy directly into an electrical energy and has higher energy efficiency than an internal combustion engine, but solid oxide fuel cell (SOFC) consisting of brittle ceramic material remains as a major issue regarding the mechanical properties as the crack formation and propagation. In this study, the stress distribution and crack behavior around the crack tip were evaluated, due to investigated the effects of the surface crack at the operating condition of high temperature. As a result, the difference of the generated stress was insignificant at operating conditions of high temperature according to the surface crack length changes. This is because, the high stiffness interconnect has a closed structure to suppress cell deformation about thermal expansion. The stress intensity factor ratio K<sub>Ⅱ</sub>/K<sub>I</sub> increased as the crack depth increased, at that time the effect of K<sub>Ⅱ </sub>is larger than that of K<sub>I</sub>. Also the maximum stress intensity factor increased as the crack depth increased, but the location of crack was generated at the electrolyte/anode interface, not at the crack tip.
제조 및 작동온도에서 평판형 고체연료전지에 발생한 균열 거동
박철준 ( Cheol Jun Park ),권오헌 ( Oh Heon Kwon ),강지웅 ( Ji Woong Kang ) 한국안전학회(구 한국산업안전학회) 2014 한국안전학회지 Vol.29 No.4
The goal of this study is to investigate some crack behaviors which affect the crack propagation angle at the planar solidoxide fuel cell with cracks under the fabricating and operating temperature and analyze the stresses by 3 steps processing on the solidoxide fuel cell. Currently, there are lots of researches of the performance improvement for fuel cells, and also for the more powerfulefficiency. However, the planar solid oxide fuel cell has demerits which the electrode materials have much brittle properties and thethermal condition during the operating process. It brings some problems which have lower reliability owing to the deformation andcracks from the thermal expansion differences between the electrolyte, cathode and anode electrodes. Especially the crack in the cornerof the electrodes gives rise to the fracture and deterioration of the fuel cells. Thus it is important to evaluate the behavior of the cracks inthe solid oxide fuel cell for the performance and safety operation. From the results, we showed the stress distributions from the cathodeto the anode and the effects of the edge crack in the electrolyte and the slant crack in the anode. Futhermore the crack propagation anglewas expected according to the crack length and slant angle and the variation of the stress intensity factors for the each fracture mode wasshown.
XFEM을 사용한 TYPE III 수소저장용기의 복합재층 균열거동 해석
박우림(Woo Rim Park),박철준(Cheol Jun Park),전상구(Sang Koo Jeon),권오헌(Oh Heon Kwon) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
In order to lead the globalization of fuel cell vehicles, it is necessary to ensure the safety of high pressure hydrogen storage vessel. The cracks in the CFRP layer of the vessel are directly connected the safety of the TYPE III high pressure vessel. The purpose of this study is to evaluate crack behaviors as the weak point of TYPE III high pressure hydrogen vessel by using a ply modeling method and XFEM. The failure criteria was determined by the maximum principal stress and displacement that excess the allowable tensile strength considering fiber and transverse direction of each ply. And the weak point of CFRP composite layers was occurred to the transverse direction at the 17<SUP>th</SUP> and 35° winding ply in the boundary of the dome and cylinder. The crack extension was resulted from of the weak transverse allowable stress at 35° helical winding. The results will be usefully applied to ensure the safety of the high pressure hydrogen vessel.
박병주,노영태,이상봉,이영덕,전동호,박철준 釜山大學校 附設 體育科學硏究所 1997 體育科學硏究所 論文集 Vol.13 No.-
The decrease of working time and the increase of leisure time occused by the forms of Factory-Automation, Office-Automation and Household-Automation. The number of people involved in sports & leisure activities are world-widely increasing, and accordingly the demand of sports & leisure goods is outstandingly increased nowdays. In this regard, the main purpose of this study is to find out how the demand and desire of consumers are being formed by purchasing sports & leisure goods, to analysis major influencing consumers' purchasing activities by means of inspecting consumers' recogintion and attitude on sports & leisure goods. The following are results ; 1. In sports & leisure activity, this study is found out that 34 men(15.5%) play once in a week, 31(14.2%) play twice or thrice in a month, 29(13.3%) play twice or three in a week. But 31 women(14.2%) play twice or three in a month, 18(8.2%) play once in a week and 25(11.4%) never do it. 2. In use of purchasing goods, man in that to physical training 114(52.1%), to leisure 13(5.9%), etc 9(4.1%), women buy to leisure 75(34.3%), to physical training 5(2.3%), etc 3(1.3%). 3. The satisfied degrees of consumers is that man(3.82±0.7) is more than woman(2.86±0.7). 4. The determinant factors in purchasing is that woman is higher than, man in price, color, quality and design. But man is higher than woman in brand. 5. In improve method of sports and leisure goods, they answered in quality 113(51.6%), in design 66(30.2%), in price 16(7.3%), in brand 14(6.46%), in color 4(1.8%), etc 6(2.7%). 6. Information resources have mass media 52(23.7%), follow or friends 36(16.4%), show window or seller 21(9.6%). 7. The determinant factors of purchasing goods is 128(58.4%) in quality, 47(21.5%) in design, 37(16.9%) in color, 7(3.2%) in brand.
여성 스포츠 소비자 증대를 위한 커뮤니케이션 형태 연구
이상봉,노영태,이영덕,전동호,박병주,박철준 釜山大學校 附設 體育科學硏究所 1997 體育科學硏究所 論文集 Vol.13 No.-
This study was executed in order to gauge the possibility of the strategy of marketing communication, which was for an increase of female consumer' participation in sports. It was conducted among a random sample of 1.346 women over the age of 18 in Pusan area, and its contents of survey was the shape of leisure activity and preferation of mass media, the aspects of their watching TV. 1. The form of leisure activity seemed to be most favoured as spectators.. Meanwhile sports-type leisure activity appeared to be more favoured by people out of work compared to people in work. 2. It was shown in the most people that they got the media of the use of commercial sports institution by their family or friends. 3. It was shown that female magazines was the most favoured among periodical magazines. 4. In daily newspapers, they prefer local one to central one. Meanwhile sports-newspaper was the worst favoured. 5. TV news was the most preferred, that is in case of the married against the unmarried. 6. It was the most shown that sports program was watched during suitable hours. But a few people answered that they hardly watch that. 7. It was shown that cultural program was watched generally during suitable hours, yet the unmarried scarcely watch that. 8. It was the most shown that comedy program was watched during suitable hours. But a few people answered that they hardly watch that. 9. It was the most shown that dramatic series and movie program were occasionally watched by them.
전동호,노영태,이상봉,이영덕,박병주,박철준 釜山大學校 附設 體育科學硏究所 1997 體育科學硏究所 論文集 Vol.13 No.-
The purpose of this study is to offer proper physical programs to the middle school EMR boys and to improve their cardiorespiratory function through measuring cardiorespiratory function when they are rest situation, all out situation ten EMR boys, divided into two groups as five exercise boys and five non- exercise ones, played soccer game more than one hour a week for 10 weeks. The results of the measurement by treadmill were as fallows 1. In analyzing the two group t-test score it was found that HR and RQ of both group didn't show statistically significant difference of all(p<0.05). 2. VE, VO₂, Vt, O₂,pluse, CO₂,were revealed the significant difference of rest situation with the exception of all-out situation and recovery(p<0.05) 3. VE, VE/VO₂, O₂/ml/kg. O₂/kg/HR, were revealed the significant difference of all-rest situation with the exception of rest situation and recovery(p<0.05) 4. VO₂, Vt, O₂pluse were revealed the significant difference of recovery situation with the exception of all-out situation and rest(p<0.05) 5. The non-exercise group higher figure in HR, Vt, O₂/ml/kg than exercise group except in VE in the rate of recovery situation in 3 minute