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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.
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 한국생산제조시스템학회 학술발표대회 논문집 Vol.2006 No.5
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.
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 한국생산제조시스템학회 학술발표대회 논문집 Vol.2006 No.5
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.
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
STD11강의 상변화 및 기계적 성질에 미치는 초심냉처리의 영향
김형준 ( H. J. Kim ),장우양 ( W. Y. Jang ) 한국열처리공학회 2015 熱處理工學會誌 Vol.28 No.3
Effects of austenitizing, cryogenic treatment and tempering conditions on the phase change, microstructure and Vickers hardness value have been studied in STD11 steel for tool and die. The volume fraction of retained austenite increased with a rise in austenitizing temperature, while the volume fraction of eutectoid M7C3 carbides decreased. The retained austenite could be reduced by cryogenic treatment i.e., maintaining at LN2 temperature (-196℃) for 12hrs but a little amount of retained austenite did not transform to martensite further although holding time increased to 24 hrs or more. The microstructure of the quenched and then cryogenictreated specimen showed nano-sized and needle-shaped carbides in matrix due to the decomposition of martensite by tempering, but that of the one without cryogenic treatment still revealed retained austenite by tempering even at 500℃. (ReceWed April 29, 2015; Revised May 8,2015; Accepted May 19, 2015)