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- 저자 : 김형준(H. J. Kim) (검색결과 200 건)
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고분자 전해질 연료전지용 Sulfonated Poly(ether sulfone)의 합성 및 특성 평가
김형준(Krishnan, N.N.),조은애(Kim, H.-J.),오인환(Prasanna, M.),홍성안(Cho, E.-A.),임태훈(Oh, I.-H.),Hong, S.-A.,Lim, T.-H. 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06
Sulfonated poly(ether sulfone) copolymers (PESs) were synthesized using hydroquinone 2-potassium sulfonate (HPS) with other monomers (bisphenol A and 4-fluorophenyl sulfone). PESs with different mole% of hydrophilic group were prepared by changing the mole ratio of HPS in the polymerization reaction. The chemical structure and the thermal stability of these polymers were characterized by using ¹H-NMR, FT-IR and TGA techniques. The PES 60 membrane, which has 60 mole% of HPS unit in the polymer backbone, has a proton conductivity of 0.091 S/cm and good insolubility in boiling water. The TGA showed that PES 60 was stable up to 272?C with a char yield of about 29%;at;900?C;under;N₂ atmosphere. To investigate the single cell performance, the catalyst coated PES 60 membrane was used and a single cell test was carried out using H₂/O₂ gases as fuel and oxidant at various temperatures. We observed that the cell performance was enhanced by increasing the cell temperature. A current density of 1400 mA/cm² at 0.60 V was obtained at 70?C.
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Fumed Silica 분말 소결법을 이용한 석영유리 제조에 하소 온도가 미치는 영향
맹지헌,윤경한,신동욱,최성철,임태영,김형준,Maeng, J.H.,Yoon, K.H.,Shin, D.W.,Choi, S.C.,Lim, T.Y.,Kim, H.J. 한국분말야금학회 2012 한국분말재료학회지 (KPMI) Vol.19 No.6
The quartz glasses were prepared by sintering of fumed silica powders and the effect of OH concentration on their surface on sintering was studied. Through the firing process, the fumed silica was crystallized from 1180 to $1260^{\circ}C$ region. The amount of hydroxyl group decreased with increase in calcination temperature and consequently the crystallization was prevented. A transparent quartz glass was obtained from fumed silica, previously calcined at $1000^{\circ}C$, by the sintering at $1250^{\circ}C$ for 1 h.
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김형준,박기식,Kim, H.J.,Park, K.S. 한국전자통신연구원 1998 전자통신동향분석 Vol.13 No.5
본 고에서는 최근 급속도로 그 수요가 확산되고 있는 전자상거래 기술 현황을 유럽을 중심으로 소개한다. 먼저 전자상거래의 정의 및 형태, 선결되어야 할 주요 문제들에 대해 기술하고 유럽의 전자상거래 등장 배경 및 범 유럽 차원의 기술 개발 프로젝트들에 대해 정리, 소개한다. 끝으로 향후의 파급효과와 전망에 대해 기술한다.
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김형준(H. J. Kim),박준홍(J. H. Park),김현수(H. S. Kim),성장현(J. H. Sung),김효겸(H. G. Kim),이재섭(J. S. Lee) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
In this study, it is attempted to find out the optimal shape of U-type bellows using the finite element method. The effective factors, mountain height, length, thickness, and number of convolutions are considered and the proper values are chosen for the simulation. The results shows that if the number of convolutions are reduced, the volume decreases while the stress increases. However, the number of convolutions are increased, the volume increases above the standard volume and the stress obviously increases. In addition, the effect of the thickness of bellows on the stress is very large. Both of the volume and stress are decreasing at a certain lower value region.
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김형준(H. J. Kim),김현수(H. S. Kim),박준홍(J. H. Park),김종필(J. P. Kim),김효겸(H. G. Kim),이재섭(J. S. Lee) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
It is attempted to find out the optimal shape of U-type bellows using the finite element analysis. The design factors, mountain height, length, thickness, and the number of convolutions are considered and the proper values are chosen for the simulation. The results show that as the number of convolutions reduces, the volume decreases while the stress increases. However, as the number of convolutions increases, the volume increases above the standard volume and the stress obviously increases. In addition, the effect of the thickness of bellows on the stress is very large. Both of the mass and stress are decreasing at a certain lower value region. Also, we investigated shape optimization with considering maximum stress distribution tendency.
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경도와 변형률 관계 예측을 위한 유한요소해석에 관한 연구
박준홍(J. H. Park),김형준(H. J. Kim),김효겸(H. G. Kim),이재섭(J. S. Lee),김현수(H. S. Kim),전언찬(E. C. Jeon),김영희(Y. H. Kim),성장현(J. H. Sung) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
Vickers hardness is one of the most widely useful methods to obtain mechanical properties of a product. The hardness number of a cold-forged product is in close relation with its effective strain. However, few attempts to obtain the relation not by empirical results but by only simulation have been made for the Vickers hardness test. This paper presents the method to predict the relation between effective strains and the hardness by using FE-simulation of the hardness test without time-killing experiments. The results of FE-simulation for the materials are compared with those of experiments and also compared with those of experiments of the previous study to show the feasibility of the proposed method.
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구연 : 제 2 회의장 (그랜드볼룸 2) ; 간 : 혈청 HBV bDNA 음성이나 간기능검사 이상을 보인 만성 B형 간염 환자들의 임상상
김상진 ( S. J. Kim ),박중원 ( J. Park ),김진희 ( J. H. Kim ),홍요한 ( Y. H. Hong ),정혜령 ( H. R. Jung ),김형준 ( H. J. Kim ),도재혁 ( J. H. Do ),유병철 ( B. C. Yoo ),박실무 ( S. M. Park ) 대한소화기학회 2002 대한소화기학회 춘계학술대회 Vol.2002 No.-
<목적> B형 간염바이러스(HBV)의 증식이 억제되면 만성 B형 간염의 활동성은 감소되며 이러한 이유에서 라미뷰딘과 같은 항바이러스제들을 치료제로 사용하고 있다. 그러나 HBV의 혈중 농도는 낮으나 간기능검사 이상을 보이는 만성 B형 간염 환자들이 상당수 있어 그 원인 규명이 필요한 실정이다. 이에 연구자들은 혈청 HBV branched DNA(bDNA) 음성인 만성 B형 간염 환자들을 대상으로 간 기능검사 이상과 관련될 수 있는 임상적 원인들을 조사하
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