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Comparison between CFD Analysis and Experiments According to Various PEMFC Flow-field Designs
이강인,성영은,이세원,박민수,조용훈,조윤환,주종남 한국전기화학회 2009 한국전기화학회지 Vol.12 No.1
Flow-field design has much influence over the performance of proton exchange membrane fuel cell (PEMFC) because it affects the pressure magnitude and distribution of the reactant gases. To obtain the pressure magnitude and distribution of reactant gases in five kinds of flow-field designs, computational fluid dynamics (CFD) analysis was performed. After the CFD analysis, a single cell test was carried out to obtain the performance values. As expected, the pressure differences due to different flow-field configurations were related to the PEMFC performance because the actual performance results showed the same tendency as the results of the CFD analysis. A large pressure drop resulted in high PEMFC performance. The single serpentine configuration gave the highest performance because of the high pressure difference magnitudes of the inlet/outlet. On the other hand, the parallel flow-field configuration gave the lowest performance because the pressure difference between inlet and outlet was the lowest.
「荊軻刺秦王」에 나타난 두 개의 이미지 - ‘협의(俠義)’와 ‘영웅(英雄)’에 대한 연구 -
이강인 중국인문학회 2023 中國人文科學 Vol.- No.84
Wuxia is a great cultural archetype with a unique tradition in Chinese history. As a fifth-generation director, Chen Kaige is a leading figure in Chinese cinema. In 1998, he directed the large-scale wuxia historical drama「荊軻刺秦王」, the movie was produced in 1969. Although the movie was not successful at the box office, it reflected his unique sensitivity. Through the characters 荊軻, 秦王, and 刺, he conveyed the image of council and heroism. What director Chen Kaige sought to portray in the film is not just the greatness of Qin Shi Huang, who kills to unite the seven heroes of the nation, or to fulfill his personal desires, but a human spirit with a sublime ideal of saving the people of the world who are suffering and groaning from the war that he has always held in his heart. Here, we saw the poor King of Qin, who had no choice but to lose his own in order to achieve the great unification of the world, not the hero, King of Qin who had been well-known.
SN비를 이용한 다수의 망소/망대특성을 가지는 MADM 문제의 선호대안 선정
이강인 한국품질경영학회 2003 품질경영학회지 Vol.31 No.4
The purpose of this paper is to propose an interactive method using the concept of Signal-to-Noise (SN) ratios and cutting ranges for selecting the most preferred alternatives of Multiple-attribute Decision-Making(MADM) with the-smaller-the-better or the-larger-the-better characteristics. In this method the decision makers could make a grouping of attributes by their priorities. This research is based on the assumption of an equality between the attributes of MADM with the characteristics of Taguchi method. As a result, this interactive method could transform the characteristic value of Taguchi method into the size of SN ratios which are relatively easy to understand by decision makers.
이강인,이성우 한국과학수사학회 2017 과학수사학회지 Vol.11 No.2
본 논문에서는 머리 부분의 손상 감소를 위한 소방용 헬멧에 충격하중을 가했을 경우에 나타나는 기계적 거동을 유한요소법으로 해석하였다. 컴퓨터 시뮬레이션에서는 소방용 및 오토바이용 헬멧모델에 대해 충격하중에 따른 거동을 비교하였다. 해석은 ABAQUS 소프트웨어를 사용하였으며 헬멧의 정점, 전면, 후면 및 측면 등 각각의 경우 5개 위치를 선정하여 충격하중에 대한 품질 인증요구사항인 1.5 m 높이의 자유낙하 시험을 모사하였다. 본 연구의 주요 결과로 충격 변형의 안전여부는 해석 내용을 반영하여 분석하였다. 재질에 따른 두 모델의 해석결과에서는 동일한 충격 순간에 매우 다른 충격 흡수성을 보임으로서 본 논문의 시뮬레이션 적용이 헬멧의 설계 및 평가에 유용하게 이용될 수 있음을 확인하였다.