MCFC 용 Ni anode 의 Pack Aluminization 기법에 관한 연구

정하철(Ha Chull Chung),박권필(Gwun Pil Park),임준혁(Jun Heok Lim),전해수(Hai Soo Chun) 고려대학교 공학기술연구소 1994 고려대학교 생산기술연구소 생기연논문집 Vol.30 No.1

N/A N/A

연 투여시의 마우스 간 조직내 δ-Aminolevulinate Dehydratase의 명역화학적 변화

이용하,정규철 중앙대학교 의과대학 의과학연구소 1981 中央醫大誌 Vol.6 No.4

Immunochemical alterations, of hepatic δ-aminolevulinate dehydratase from ICR strain of mice exposed tio lead in vitro (10 mM Pb^++) and in vivo (intraperitoneal injection of Pb^++ 1.3mg per 10 grams of body weight) were investigated by Ouchterlony gel double diffusion analysis as described by Kabat and Mayer (1967) and Campbell et al. (1970). and two-dimensional immunoelectrophoresis by Laurell (1965). Rabbit antiserum against hepatic δ-aminolevulinate dehydratase from ICR strain of mice purified 230-folds by methods of Doyle and Schimke (1969) modified by Lee and Chung (1979) was prepared as described by Kenny (1971) and Alexander and Kenny (1973). Heat-treated (at 64℃, for 10 minutes) supernatants (45,000×g for 2 hours and 20 minutes) of various tissue homogenates were used as antigens. Ouchterlony gel double-diffusion analysis revealed that the antigenicity of the δ-aminolevulinate dehydratase was identical between those distributed in various tissues of the mice. Administration of lead in vivo, 3 hours prior to evisceration seemed to affect the antigenicity of the δ-aminolevulinate dehydratase, resulting in the production of an additional precipitation line on the gel diffusion slide. Normal hepatic δ-amiriolevulinate dehydratase from ICR strain of mice showed 3 protein peaks with mobilities of 1.01(peak A), 0. 80(peak C), and 0.43 (peak D) relative to the mobility (1.0) of bovine serum albumin fraction V (peak B). The immunoelectrophoretic pattern was identical with the normal δ-aminolevulinate dehydratase unaffected by the addition of lead in vitro whereas administration of lead in vivo induced an appearance of additional peak E with the relative mobility of 0.68. Three protein peaks that appeared in two-dimensional immunoelectrophoresis were considered as common protein fractions of δ-aminolevulinate dehydratase, and peak E as an unique protein fraction caused by de novo production of lead type δ-aminolevulinate dehydratase by addition of lead in vivo as suggested by Cantrell et al. (1977). These findings, therefore, could be an important. clue to the possibility of developing an immunological diagnostic tools for the evaluation of lead absorption. Further study would be required to determine the dose-response relationship between the amount of lead exposed and appearance and extent of production of the unique protein fraction.

연의 체내분포에 관한 실험적 연구

이용하,정규철 중앙대학교 의과대학 의과학연구소 1979 中央醫大誌 Vol.4 No.1

This experimental study was designed to investigate a pattern of lead distribution in various tissues when an individual was exposed to inorganic lead. Sprague Dawley male albino rats weighing 250∼300 g were used for the study. The rats were divided into several groups and 1% lead nitrate solution was administered into abdominal cavity, 0.01, 0.03, 0.05 and 0.07 ml/g of body weight, respectively, to each group of rats. The lead levels in tissues were analyzed consecutively following the administration of the lead by dithizone methods of Keenan et al. Effects of alcohol on lead absorption was also discussed. 1. Lead contents per gram of fresh weight of tissue of normal rats were the highest in spleen and liver, and high in heart and kidney, and the lowest in brain, muscle and blood. The pattern of lead distribution in tissues of rat was similar with that in human. The lead concentrations of normal rats were much higher than those in human tissues. 2. Lead concentrations in spleen and liver increased promptly showing the highest levels 30 minutes or 1 hour following the administration of lead and kept higher levels until 16 hours of observation. The lead concentration in kidney steadily increased until it reached the maximum level at 4 hours after the administration, when the actual lead level per gram of fresh weight of the tissue was much lower than those in liver and spleen. Blood lead concentration reached the highest value 4.35㎍/ml 2 hours following the administration of lead. Even though the actual lead levels in blood is lower than in other tissues, rate of increase was 41 times as high as normal blood levels of rats. 3. It seemed to enhance the rate of lead absorption from the abdominal cavity when the 50% of ethanol was simultaneously administered with lead. 4. As the dosage of lead increased, the rate of lead absorption in each tissue decreased. This suggests that each tissue has its own limitation in the capacity of lead absorption that varies by each tissue.

Pack Cementation 법으로 제조된 MCFC 용 합금 Anode 의 특성

정하철,박권필,임희천,전해수 ( Ha Chull Chung,Gwun Pil Park,Hee Chun Lim,Hai Soo Chun ) 한국화학공학회 1998 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.36 No.6

The pack cementation process of metal(Al, Cr) halide vapor on a porous pure Ni-anode substrate for molten carbonate fuel cell was studied to improve creep resistance of the anode substrate. The pack consists of metal powder(Al, Cr or Al-Cr mixture), activator(NaCl or NH₄Cl) and inert filler(Al₂O₃). The pack cementations on the nickel-anode substrate were carried out at 550-900 ℃ for 0.5-5.0 hours. It was found that various intermetallic compounds for Al(Ni₃Al, NiAl, or Ni₂Al₃) and some of solid solution between Ni and Cr were formed on the porous Ni-anode substrate and the deposition weight of metals depending on time was parabolic. The porosity of the alloy anodes(intermetallic or solid solution) decreases linearly with deposition content of metallic additives. The Ni-anodes deposited as Ni-Al intermetallic form and codeposited with Al and Cr showed good performance against creep and its pore structure did not change after pack cementation. The Ni-anode substrate, which Al and Cr were codeposited on, showed about 1 % creep strain under 650 ℃ and 100 psi after 100 hour.

흉추강내 동정맥기형을 동반한 마미의 거대한 상의세포종 1례 보고

김동희,이신하,박권희,김정철,김대조 대한신경외과학회 1983 Journal of Korean neurosurgical society Vol.12 No.3

Spinal ependymomas originate in the ependymal lining and grow rather slowly which allows them to reach considerable size and length. The great majority of primary tumors of the cauda equina are ependymomas and show a rather marked predilection for the male. Histologically ependymomas are benign but metastasis and anaplasia have been reported. The basic architectural structures of the ependymoma are the ependymal rosettes and pseudo-rosettes. Intradural spinal arteriovenous malformations are relatively rare lesions and found only at autopsy or incidentally during surgical operations before the advent of investigative procedure. Development of myelography and spinal angiography have shown that vascular malformations of the spinal cord are not rare. Male is more predominant than female. The etiology and pathophysiological mechanisms are uncertain but many authors have believed that congenital, trauma, inflammations, tumoral processes, vasculitis and abnormal posture are influenced on A-V malformations of the spinal cord. No reports have been noticed about giant ependymomas of the cauda equina combined with spinal A-V malformations. We have experienced a case of giant ependymomas of the cauda equina associated with thoracic intradural spinal A-V malformations in forty-two year-old male and reviewed the literatures.

Agglomerated film model 을 이용한 용융탄산염 연료전지용 perovskite 음극의 성능예측

임준혁,이병선,정하철,김윤성,위정호,전해수 ( Jun Heok Lim,Byung Sun Lee,Ha Chull Chung,Yun Sung Kim,Jung Ho Wee,Hai Soo Chun ) 한국공업화학회 1997 응용화학 Vol.1 No.1

A dual-porosity filmed agglomerate model for the porous cathode of the molten carbonate fuel has been investigated to predict the perovskite type cathode performance. The model predicts steady-state cell performance, given the above conditions that characterize the state of the perovskite electrode. Also, the effective surface area of electrode pore was obtained by mercury porosimeter. The results of the investigation are presented in the form of plots of overpotential vs. current density with varied the electrode material, gas composition and mechanism. The predicted polarization curves are compared with the empirical data from 1 ㎠ cell.

Genetic Analysis of Pod Dehiscence in Soybean

Sung Taeg Kang,Hyeun Kyeung Kim,In Youl Baek,Moung Gun Chung,Won Young Han,Doo Chull Shin,Suk-Ha Lee 韓國作物學會 2005 Korean journal of crop science Vol.50 No.4

Pod dehiscence (PD), defined as the opening of pods along both the dorsal and ventral sutures, causes the seed to shatter in the field before harvesting and results in loss of seed yields. However, breeding for resistance to PD is difficult due to the complicated genetic behavior and environmental interaction. The objective of the present research was to analyze the genetic behavior of PD for improving the breeding efficiency of resistance to PD in soybean. PD after oven-drying the sampled pod at 40~circC for 24 hours was the most reliable to predict the degree of PD tested in the field. Keunolkong, a dehiscent parent, was crossed with non-dehiscent parents, Sinpaldalkong and Iksan 10. Using their F1~;and~;F2 seeds, PD was measured after oven drying the pod at 40~circC for 24 hours. The gene conferring PD behaved in different manners depending on the genetic populations. In the Keunolkong~times Sinpaldalkong population, PD seemed to be governed by single major recessive gene and minor genes, while several genes were probably involved in the resistance to pod dehiscence in the Keunolkong~times Iksan 10 population. Heritability for PD estimated in F2 population showed over 90~% in the two populations. High heritability of PD indicated that selection for resistance to PD should be effective in a breeding program. In addition, genetic mapping of quantitative locus (QTL) for PD in both populations may reveal that genes conferring PD are population-specific

Genetic Analysis of Pod Dehiscence in Soybean

Kang Sung Taeg,Kim Hyeun Kyeung,Baek In Youl,Chung Moung Gun,Han Won Young,Shin Doo Chull,Lee Suk-Ha The Korean Society of Crop Science 2005 Korean journal of crop science Vol.50 No.4

Pod dehiscence (PD), defined as the opening of pods along both the dorsal and ventral sutures, causes the seed to shatter in the field before harvesting and results in loss of seed yields. However, breeding for resistance to PD is difficult due to the complicated genetic behavior and environmental interaction. The objective of the present research was to analyze the genetic behavior of PD for improving the breeding efficiency of resistance to PD in soybean. PD after oven-drying the sampled pod at $40^{\circ}C$ for 24 hours was the most reliable to predict the degree of PD tested in the field. Keunolkong, a dehiscent parent, was crossed with non-dehiscent parents, Sinpaldalkong and Iksan 10. Using their $F_1\;and\;F_2$ seeds, PD was measured after oven drying the pod at $40^{\circ}C$ for 24 hours. The gene conferring PD behaved in different manners depending on the genetic populations. In the Keunolkong$\times$Sinpaldalkong population, PD seemed to be governed by single major recessive gene and minor genes, while several genes were probably involved in the resistance to pod dehiscence in the Keunolkong$\times$Iksan 10 population. Heritability for PD estimated in F2 population showed over $90\%$ in the two populations. High heritability of PD indicated that selection for resistance to PD should be effective in a breeding program. In addition, genetic mapping of quantitative locus (QTL) for PD in both populations may reveal that genes conferring PD are population-specific.

용융탄산염 연료전지용 LiCoO2 cathode 의 특성

임준혁(Jun Heok Lim),이재성(Jae Sung Lee),정하철(Ha Chull Chung),위정호(Jung Ho Wee),전해수(Hai Soo Chun) 고려대학교 공학기술연구소 1995 고려대학교 생산기술연구소 생기연논문집 Vol.31 No.1

N/A N/A

직접 내부개질형 용융탄산염 연료전지 ( DIR - MCFC ) 의 성능 및 반응에 관한 수치모사

박정훈,이재성,정하철,김윤성,위정호,임준혁,전해수 ( Jung Hoon Park,Jae Sung Lee,Ha Chull Chung,Yun Sung Kim,Jung Ho Wee,Jun Heok Lim,Hai Soo Chun ) 한국화학공학회 1998 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.36 No.6

The distribution of temperature, current density and gas composition in the direct internal reforming molten carbonate fuel cell(DIR-MCFC), especially on the anode surface, was studied by the numerical modeling. The conditions for modeling of our study are as followings. Catalyst bed is made contact direct with anode and the flow of fuel and oxidant is considered as the cross flow. The steam to carbon ratio(S/C ratio) is taken to be 2.5 and heat released by electrochemical reaction is transferred uniformly to the catalyst bed. Two chemical reactions, steam reforming reaction and water-gas shift reaction, are considered to be taking place in the anode-side in addition to the electrochemical reaction. The reactions in the catalyst bed is assumed to be kept in the state of equilibrium. The result of this model shows that the local temperature of fuel cell was the highest at the gas exit of each electrode and methane-steam reforming was drastically occurred until the forward 30 % position along the direction of the anode gas flow while water gas shift reaction progressed actively from the point of forward 50 % position to the end point of anode. The average composition of hydrogen at the gas outlet calculated from this model was 10 % lower than that measured from experiments.