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X-ray 마스크용 $WN_x$ 박막 증착에 관한 연구(l)
장철민,최병호,Jang, Cheol-Min,Choi, Byung-Ho 한국재료학회 1998 한국재료학회지 Vol.8 No.2
$WN_x$ 는 리소그라피 마스크의 흡수체나 VLSI 기술에서 금속연결의 확산방지재로써 주목을 받고 있다. RF마르네트론 스퍼터링법으로 여러 증착변수에서 제조한 $WN_x$ 막을 고찰하였다. $SiN_x$ 멤브레인 위에 증착된 박막의 결정구조는 질소아르곤 가스유량비(0-30%), 가스압력(10-43mTorr), RF출력(0150W)및 기판과 타겟사이의 거리 6cm에서 증착한 $WN_x$ 박막은 비정질이였으며 다른 조건에서는 표면이 거친 다결정질이었다. 비정질 박막은 rms가 $3.1\AA$으로 아주 매끈하여 X-선 마스크용 흡착제로써 적합할 것으로 기대된다. Tungsten nitride is very attractive as absorber for X-ray lithographic mask and as a diffusion barrier for interconnecting metallization in Si VLSI technology. Microstructure of tungsten nitride films prepared by RF magnetron sputtering has been investigated as a function of deposition parameter. The crystal structure of sputtered films on silicon nitride membrane depends strongly on the NJAr gas flow ratio(0~18%1, gas pressure(l0~43mTorr). RF power (60~150W), target-substrate distance(4~8cm). Tungsten nitride films deposited at the $N_2/Ar$ gas flow ratio(- 10%). gas pressure(~10mmTorr), RF power(~150W) and target-substrate distance(6cm) are amorphous, but at other conditions are almost rough -surfaced polycrystalline. Amorphous films are very smooth($3.1\AA$ rms) and expected to be excellent absorber for X-ray mask.
EVA로 Blending된 Polypropylene Fiber의 염색성에 관한 연구
장철민,임상규,김삼수,손태원,서말용 한국염색가공학회 1998 韓國染色加工學會誌 Vol.10 No.5
Polypropylene-ethylene/vinyl acetate copolymer (PP-EVA) blends were prepared by mechanical blending using relatively semi-crystaline ethylene-vinyl acetate copolymer and polypropylene. In order to obtain dyeable PP fiber, PP-EVA blends were prepared using below 10wt.% of EVA and formed a filament by the melt spinning method. The resultant fibers had tensile strengh of 2∼3g/d, elongation of 330∼600%, initial modulus of 22∼46g/d, and exhibited markedly improved dyeing property.
장철민 ( Cheol Min Jang ),김슬기 ( Seul Ki Kim ),김남희 ( Nam Hee Kim ),이신영 ( Shin Yeoung Lee ),유경모 ( Kyung Mo Yoo ),이태훈 ( Tae Hoon Lee ),채현범 ( Hyun Beom Chae ),한기중 ( Ki Joong Han ),주은정 ( Eun Jeong Joo ),안중경 ( 대한류마티스학회 2015 대한류마티스학회지 Vol.22 No.3
Sweet``s syndrome is an uncommon reactive dermatoses characterized by fever, polymorphonuclear leukocytosis, painful erythematous plaques, and dense dermal infiltrate of neutrophils. Sweet``s syndrome can be associated with several diseases, including infectious diseases, malignant tumors, and autoimmune diseases. However, no case of Sweet``s syndrome associated with Sjogren``s syndrome (SjS) has been reported in Korea. A 44-year-old woman presented with acute pustular rashes and fever. The patient had multiple papulopustular skin rashes, and complained of fever, chills, and headache. Our patient had the characteristic clinical and histopathological features of Sweet``s syndrome, in association with SjS, diagnosed by salivary gland scan, positive anti-SS-A/SS-B antibody, and sicca symptoms simultaneously. Thus, we report on a case of a patient with Sweet``s syndrome with concomitant diagnosis of SjS. (J Rheum Dis 2015;22:175-179)
스마트 미터 기반의 비즈니스 모델 -이동 통신사를 중심으로-
장철민(Jang,Cheol Min),최용락(Choi,Yong Lak) 한국IT서비스학회 2009 한국IT서비스학회 학술대회 논문집 Vol.2009 No.3
스마트 그리드에서 해결해야 하는 우선 과제는 스마트 미터의 보급이다. 스마트 미터는 스마트 그리드의 핵심이지만 초기 구축비용 문제로 난항을 겪고 있다. 따라서 본 연구에서는 스마트 미터의 보급을 이동통신사들이 담당하는 수익 구조 모델을 제안하고자 한다. 이동통신사들이 기존의 통신망에 스마트 미터를 임대하는 방식으로 보급하면 빠른 시일 내에 저변확대가 가능하다고 판단한다. 즉, 이동통신사는 스마트 미터라는 새로운 수익 모델을 창출하고 정부는 스마트 그리드 구축비용을 최소화 할 수 있다.
장철민(Jang, Chul-Min),강정규(Kang, Jeong-Gyu) 한국주거환경학회 2013 주거환경(한국주거환경학회논문집) Vol.11 No.1
This study is about housing demand according to price-area in Busan, and the purpose is to analyze the housing demand of different cluster and estimate the total housing demand in Busan until 2020. Recently, because of changing household structure, the 1-2 person household is increasing steadily, and the housing demand is changing as the normal household is changing from 4 people to 3 people. According to the estimated future population data, the growth rate of households in Busan will be decreased gradually until 2020, and after 2012, the number of households will start decreasing, which is why the policy for housing demand must be reconsidered now. This study studied both housing demand based on area from the conventional aggregate approach, and housing demand that combined price and area. Also, the housing demand of different cluster was studied and estimated by considering regional characteristics.
장철민 ( Cheolmin Jang ),정영걸 ( Young Kul Jung ) 대한소화기학회 2018 대한소화기학회지 Vol.72 No.2
Hyponatremia is a commonly observed complication that is related to hypoalbuminemia and portal hypertension in patients with advanced liver cirrhosis. Hyponatremia in patients with liver cirrhosis is mostly dilutional hyponatremia and is defined when the serum sodium concentration is below 130 meq/L. The risk of complications increases significantly in cirrhotic patients with hyponatremia, which includes spontaneous bacterial peritonitis, hepatorenal syndrome, and hepatic encephalopathy. In addition, hyponatremia is associated with increased morbidity and mortality in patients with cirrhosis, and is an important prognostic factor before and after liver transplantation. The conventional therapies of hyponatremia are albumin infusion, fluid restriction and loop diuretics, but these are frequently ineffective. This review investigates the pathophysiology and various therapeutic modalities, including selective vasopressin receptor antagonists, for the management of hyponatremia in patients with liver cirrhosis. (Korean J Gastroenterol 2018;72:74-78)
김경우,장철민,박종오,이희준,Kim, Kyung-Woo,Jang, Cheol-Min,Park, Jong-O,Lee, Hee-Joon 해양환경안전학회 2014 해양환경안전학회지 Vol.20 No.5
In order to reduce the risk of deaths from hypothermia at sea, this paper suggests the performance criteria of life rafts for small fishing vessels less than 20 m in length. In our country, the life rafts are not used and have no performance criteria. This research compared the performance criteria of the domestic, foreign, international standards, and the performance comparison between foreign life rafts and the user-friendly valise prototype(2 & 4 persons) which is developed by this study. As a result, it is considered to be appropriate that ISO 9650-1 can be applied to the life rafts for offshore fishing vessels while a milder criteria can be applied to the life rafts for coastal fishing vessels. 본 연구에서는 해상에서의 저체온증 사망위험을 감소시키기 위해, 배의 길이 20미터 미만의 우리나라 소형어선에 비치하기 적합한 구명뗏목의 성능기준을 제안했다. 우리나라에는 소형어선용 구명뗏목이 사용되고 있지 않으며 관련 성능기준도 없다. 국내외 및 국제표준의 성능기준을 비교하고, 외국산 구명뗏목 및 본 연구로 개발된 가방형 시제품(2 4인승)의 성능 평가결과를 분석했다. 그 결과, 근해어선의 구명뗏목에는 ISO 9650-1 기준을 적용하고, 연안어선의 구명뗏목에는 ISO 9650-2보다 기준을 낮추어 적용하는 것이 적절할 것으로 판단된다.