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임종찬,양희선,김현식,Lim, Jong-Chan,Yang, Heesun,Kim, Hyun-Sik 한국마이크로전자및패키징학회 2020 마이크로전자 및 패키징학회지 Vol.27 No.4
열전소재의 격자열전도도 저감은 열전성능 증대를 위해 가장 빈번하게 사용되는 방법이다. 하지만 전체 열전도도에서 다른 열전도도 기여분을 제외하는 방법으로만 격자열전도도를 구할 수 있기 때문에 격자열전도도를 정확하게 분석하는 것을 간단한 작업이 아니다. 본 연구에서는 먼저 전자/홀에 의한 열전도도 기여분 (모든 소재 적용)과 쌍극 전도에 의한 기여분 (작은 밴드 갭 소재 적용)을 정확하게 계산해야만 격자열전도도를 정확하게 분석할 수 있음을 설명한다. 전자/홀에 의한 기여분을 계산하기 위해 필수적인 로렌츠 숫자 계산법 (싱글 파라볼릭 모델링 및 간단한 식 이용)과 쌍극 전도에 의한 기여분 계산법 (투 밴드 모델링) 또한 소개한다. 격자열전도도의 정확한 분석은 격자열전도도 저감을 위한 여러 결함 제어 전략의 효과를 객관적으로 평가할 수 있는 강력한 분석 도구로 사용될 수 있다. Suppressing lattice thermal conductivity of thermoelectric materials is one of the most popular approach to improve their thermoelectric performance. However, accurate characterization of suppressed lattice thermal conductivity is challenging as it can only be acquired by subtracting other contributions to thermal conductivity from the total thermal conductivity. Here we explain that electronic thermal conductivity (for all materials) and bipolar thermal conductivity (for narrow band gap materials) need to be determined accurately first to characterize the lattice thermal conductivity accurately. Methods to calculate Lorenz number for electronic thermal conductivity (via single parabolic model and using a simple equation) and bipolar thermal conductivity (via two-band model) are introduced. Accurate characterization of the lattice thermal conductivity provides a powerful tool to accurately evaluate effect of different defect engineering strategies.
출혈성 쇼크로 유도된 흰쥐의 위병변에 대한 Allopurinol의 보호 효과에 관한 연구
임종찬 ( Jong Chan Lim ),조현덕 ( Hyun Duk Cho ),김종숙 ( Jong Suk Kim ),이일남 ( Il Nam Lee ),장세경 ( Sei Keung Chang ) 대한소화기학회 1990 대한소화기학회지 Vol.22 No.1
This study was designed to determine whether oxygen derived free radicals play a role in the pathogenesis of gastric lesions produced by hypotensive ischemia and whether allopurinol, an in-hibitor of xanthine oxidase (the enzyme responsible for the formation of superoxide radicals) has the protective effect on ischemic gastric lesions. To achieve this goal, the changes of antioxidant enzyme activity; xanthine oxidase, superoxide dismutase (a scavenger of superoxide radicals <O-2 >), catalase and peroxidase were measured in control group, in hemorrhagic shock groups and in allopurinol pretreated hemorragic shock groups. Allopurinol pretreated hemorrhagic shock groups were subclassed by dose of administration (25 mg, 50 mg, 75 mg/kg). The resuits were summarized as follows; 1) In hemorrhagic shock group, the activities of total SOD and xanthine oxidase were significantly higher than those in control group (p<0.05). 2) In allopurinol pretreated hemorragic shock groups, the activities of total SOD and xanthine oxidase were lower than those of hemorragic shock group (p<0.05). But there was no linear relation between the increased dose of administration and the inhibition of activities of SOD and xanthine oxidase. 3) The activities of catalase and peroxidase were not significantly different in all groups of this study. 4) The gastric lesions (hemorrhage, edema, erosion) were significantly severe in hemorrhagic shock induced rats irrespective of allopurinol pretreatment compared to control group. And the lesions were more severe in antrum and cardia than the fundus. From the above resu]ts, oxygen derived free radicals may play an important role in the formation of gastric lesions produced by ischemia plus HCI. Allopurinol could have the protective effect on hemorrhagic shock induced gastric lesions by inhibition of xanthine oxidase ivhich is reponsible for the formation of superoxide radicals.
Recent Research Trend in WO3-based Gas Sensors for Enhancing Sensing Properties
임종찬(Jong-Chan Lim),김현식(Hyun-Sik Kim) 한국세라믹학회 2021 세라미스트 Vol.24 No.2
Semiconducting Metal Oxide (SMO) gas sensors have attracted considerable attention to analyze gases in exhaled breath and monitor air quality. This paper reports a recent research trend for enhancing sensing properties of WO3 (tungsten oxide), a representative n-type gas sensing material. Firstly, the operating principle of WO3 based gas sensors is explained. Secondly, various nanostructures of WO3 from zerodimensional to three-dimensional are reviewed. Thirdly, doping and decoration as effective strategies to enhance gas sensing properties are introduced. We summarize recent progress and provide an insight for enhancing gas sensing properties of WO3 based gas sensors.
임종찬(Jong Chan Lim),유호준(Ho Jun Yoo),심상준(Shang Jun Shim),유석희(Suk Hee Yu),이현순(Hyun Soon Lee) 대한내과학회 1989 대한내과학회지 Vol.37 No.5
N/A Acute cortical necrosis is a rare but catastrophic disease due to complete or partial destruction of all elements of the renal cortex. The clinical picture of the disease is characterized by acute renal failure, often with a fatal outcome. We report a case of acute cortical necrosis following an operation of the abdominal stab wound. A 22-year-old man was admitted to our hospital because of an abdominal stab wound. A segmental resection of the sigmoid colon and midileum and end to end anastomosis were performed. Oliguria developed on the third hospital day and was treated with hemodialysis therapy on the third hospital day and was treated with hemodialysis therapy on the 5th hospital day. The anuria persisted for 20 days and the total period of oliguria was 28 days. On the 73rd hospital day, a kidney needle biopsy was done and microscopic examination of the specimen showed cortical necrosis of the patchy form with fibrosis and calcification, The patient had received a total of 13 hemodialysis therapy sessions and was complicated by an episode of septicemia which originated from the indwelling femoral catheter. The recovery of renal function was incomplete but was sufficient to persist without hemodialysis therapy.
전극용 Ag Paste의 Cellulose Acetate Propionate(CAP) 개질에 따른 태양전지 효율 향상
김동민,임종찬,김진현,차상호,이종찬,Kim, Dong Min,Lim, Jong Chan,Kim, Jin Hyun,Cha, Sang-Ho,Lee, Jong-Chan 한국재료학회 2018 한국재료학회지 Vol.28 No.4
We investigate the effect of the modification of cellulose acetate propionate as an organic vehicle for silver paste on solar cell efficiency. For the modification of cellulose acetate propionate, poly(ethylene glycol) is introduced to the hydroxyl groups of a cellulose acetate propionate backbone via esterification reaction. The chemical structure and composition of poly(ethylene glycol) functionalized cellulose acetate propionate is characterized by Attenuated total reflectance Fourier transform infrared, $^1H$ nuclear magnetic resonance, differential scanning calorimetry and thermogravimetric analysis. Due to the effect of structural change for poly(ethylene glycol) functionalized cellulose acetate propionate on the viscosity of silver paste, the solar cell efficiency increases from 18.524 % to 18.652 %. In addition, when ethylene carbonate, which has a structure similar to poly(ethylene glycol), is introduced to cellulose acetate propionate via ring opening polymerization, we find that the efficiency of the solar cell increases from 18.524 % to 18.622 %.
위장관 ( 胃腸管 ) : 에탄올에 의한 흰쥐의 위점막 손상에서 위점막 항 산화 효소에 대한 D - Methyl Prostaglandin E1 의 영향
김종숙(Jong Suk Kim),이일남(Il Nam Lee),임종찬(Jong chan Lim),장세경(Se Kyung Chang),조현덕(Hyon Dug Cho) 대한소화기학회 1990 대한소화기학회지 Vol.22 No.4
N/A To clarify the mechanism of ethanol induced gastric mucosal damage and protective effect of d-methyl prostaglandin (PG) E against the gastric mucosal damage, the activiteis of superoxide (SOD), catalase, glutathione peroxidase of rat stomach were measured after topical application of ethanol in stomach of rats with or woitout d-methyl PGE pretreatment.Variable doses of d-methy1 PGE were given intragastrically at 30mins before the administration of 75% ethanol.The results were summarized as follows;1) The SOD, catalase, glutathion peroxedase activities increase with different concentration of ethanol.2) The each eazyme actinity also shwed dose dependent decrease in the d-methyl PGE pretreatment group than only 75% ethanol application group. According to our experimint it was suggested that superoxide radical may play a role on ehtnol-indeced gastric damage in rats.