국가경쟁력 제고를 위한 중앙

차성덕(Cha Sung-duk) 서울행정학회 1998 한국사회와 행정연구 Vol.9 No.1

광 입사각이 BIPV에 적용되는 단결정 또는 비정질 실리콘 태양전지의 양자효율에 미치는 영향

강정욱,손찬희,조광섭,유진혁,김정식,박창균,차성덕,권기청,Kang, Jeong-Wook,Son, Chan-Hee,Cho, Guang-Sup,Yoo, Jin-Hyuk,Kim, Joung-Sik,Park, Chang-Kyun,Cha, Sung-Duk,Kwon, Gi-Chung 한국진공학회 2012 Applied Science and Convergence Technology Vol.21 No.1

건재 일체형 태양광발전(BIPV) 응용을 위해 광 입사각에 따른 태양전지의 변환 효율은 중요하다. 양자효율은 태양전지의 파장별 전자 수집효율을 말하며, 입사각별 양자효율 측정으로 입사각에 따른 태양전지 출력 변화 요인을 분석할 수 있다. 이러한 입사각별 양자효율은 태양전지 종류에 따라 차이를 보인다. 본 연구에서는 가장 많이 쓰이는 벌크형 단결정 실리콘 태양전지와 박막형 비정질 실리콘 태양전지의 입사각별 양자효율을 비교하였다. 그 결과, 단결정 실리콘 태양전지에서는 광 입사각이 증가함에 따라 전 파장영역에서 양자효율이 감소했다. 반면, 비정질 박막 실리콘 태양전지에서는 단파장 영역에서는 결정질 실리콘과 동일하게 감소하였으나, 그 이후의 흡수 영역에서 약 $40^{\circ}$의 입사각까지 증가 또는 일정한 양자효율을 보이다가 이후에 급격히 감소하는 결과를 얻었다. 이는 비정질 박막 실리콘 태양전지에서 입사각이 증가함에 따라 특정 파장 영역에서 산란과 박막 구조의 영향으로 예상된다. 따라서, 태양전지의 구조 및 광학 구조 최적화 등으로 BIPV 적용에 유리한 구조 태양전지 제작이 가능할 것으로 보인다. The conversion efficiency of solar cells depending on incident angle of light is important for building-integrated photovoltaics (BIPV) applications. The quantum efficiency is the ratio of the number of charge carriers collected by the solar cell to the number of photons of a given energy shining on the solar cell. The analysis of angle dependence of quantum efficiencies give more information upon the variation of power output of a solar cell by the incident angle of light. The variations in power output of solar cells with increasing angle of incidence is different for the type of cell structures. In this study we present the results of the quantum efficiency measurement of single-crystalline silicon solar cells and a-Si:H thin-film solar cells with the angle of incidence of light. As a result, as the angle of incidence increases in single-crystalline silicon solar cells, quantum efficiency at all wavelength (300~1,100 nm) of light were reduced. But in case of a-Si:H thin-film solar cells, quantum efficiency was increased or maintained at the angle of incidence from 0 degree to about 40 degrees and dramatically decrease at more than 40 degrees in the range of visible light. This results of quantum efficiency with increasing incident angle were caused by haze and interference effects in thin-film structure. Thus, the structural optimization considering incident angle dependence of solar cells is expected to benefit BIPV.

스테로이드 저항성 궤양성 대장염 환자에 대한 Cyclosporine A의 치료 효과

이대희(Dae Hee Lee),이준행(Jun Haeng Lee),박동영(Dong Young Park),김윤준(Yoon Jun Kim),황진혁(Jin Hyok Hwang),차성덕(Sung Duk Cha),정운태(Woon Tae Jeong),윤정환(Jung Hwan Yoon),이국래(Kook Lae Lee),이동호(Dong Ho Lee),정현채(Hyun Cha 대한소화기학회 1998 대한소화기학회지 Vol.30 No.1

N/A Background/Aims: In refractory severe ulcerative colitis patients who are resistant to intravenous corticosteroids and total parenteral nutrition, new medical therapeutic tools that induce rapid remission is required in order that the patients can avoid colectomy. Since 1990, several western groups reported in their well designed studies that cyclosporine A cou)d induce rapid remission at steroid resistant severe ulcerative colitis patients resulting avoidance of colectomy. We tested the effectiveness of intravenous cyclosporine A therapy at steroid resistant severe ulcerative colitis patients in Korea, which has little experiences in the management of steroid resistant severe ulcerative colitis. Methods: Seven patients were included who were refractory to intravenous corticosteroids and total parenteral nutrition of at least 4 weeks duration. Their liver function tests and creatinine clearance tests were all normal. Cyclosporine A were administered by continuous intravenous methods over 6 hours or 24 hours. The starting doses of cyclosporine A were 4 mg/kg. The blood level was monitored by radioimmunoassay with a monoclonal antibody. The doses were adjusted at blood level from 100 ng/ml to 400ng/ml. In one patient cyclosporine A was administered for only 4 days because of rapid aggravation and consequent emergency operation. In another 6 patients cyclosporine A were administered for 14 days. Results: Four patients revealed scores of less than 10 by clinical activity scores system. But, in spite of improvement by scores, 3 patients of above 4 responders exhibited persistent gross hematochezias at frequencies of more than 3 times a day. Therefore operations were recommended in 6 patients. But one patient refused operation and is under OPD follow up with oral cyclosporine A and corticosteroids medications but he exhibits persistent gross hematochezia at a frequency of 3 or 4 tirnes a day. Out of 5 patients who were operated, 4 patients were cured by operations but 1 patient died because of postoperational sepsis. Conclusions: We found that the intravenous cyclosporine A therapy produced some improvement by clinical activity scores in 4 patients out of 7 patients but induced clinical remission of gross hematochezia in only 1 patient. Therefore operation could be avoided in only 1 patient. This result suggests that the response of Korean patients to intravenous cyclosporine A therapy would be different from that of western people. However, many another studies, especially case control studies are required to clarify this possibility and to assign the proper role of intravenous cyclosporine A therapy in the manageent of patients with ulcerative colitis in Korea. (Korean J Gastroenterol 1997; 30:58-65)

간경변증에 수반된 폐내단락에 의한 간폐 증후군 1 예

손대원,박동영,이효석,김정룡,김진,김병관,차성덕,유철규 대한내과학회 1997 대한내과학회지 Vol.53 No.2

The hepatopulmonary syndrome is defined as the triad of liver disease, an increased alveolar-arterial gradient while breathing room air, and evidence of intrapulmonary dilatation. Other cardiopulmonary abnormalities(such as pleural effusion or decreased lung volumes) are common and may coexist in patients with the hepatopulmonary syndrome. An abnormal dilatation of intrapulmonary capillaries is evidenced by Tc 99m-MAA perfusion scan, contrast-enhanced echocardiography, and pulmonary angiography. We have experienced a case of hepatopulmonary syndrome in a 67 year old woman with liver cirrhosis who complained of severe dyspnea and cyanosis. Her arterial blood gas analysis (ABGA) showed severe hypoxemia(PaO₂ 59mmHg), suggesting the hepatopulmonary syndrome, which was confirmed with the contrast-enhanced echocardiography. It showed delayed opacification of left side chambers during agitated saline injection', thus, intrapulmonary shunt was confirmed. So we report a case of hepatopulmonary syndrome with a review of literature.

대장에 생긴 혈관중심성 T 세포 림프종 2 예

김경아,송인성,김철우,박민정,김정룡,신경한,김주성,차성덕,변정식,정준오,이진혁,정현채 대한소화기학회 1999 대한소화기학회지 Vol.33 No.2

Angiocentric T cell lymphoma is characterized by angiocentric and angioinvasive infiltration. The vascular occlusion is usually associated with prominent ischemic necrosis of both tumor cells and normal tissue. Extranodal sites invariably include nose, palate, skin, lung and gastrointestinal tract. In intestinal angiocentric T cell lymphoma, patients present with acute abdominal pain, bloody stool o bowel perforation resulting from ischemic necrosis and have grave prognosis. We report two cases of angiocentric T cell lymphoma involving the colon. In the first case, the patient had the history o polymorphic reticulosis in left nasal cavity six years ago. In the second case, the patient complained of fever and diarrhea, and had splenomegaly. We assume that this is the first case of angiocentric T cell lymphoma involving the colon in Korea. (Kor J Gastroenterol 1999;33:292 - 297)

크론병으로 인한 대장협착의 내시경적 풍선확장술 1예

김지원,송인성,정현채,최규완,박민정,김정룡,김진,문선희,차성덕,황진혁,김찬규 대한소화기내시경학회 1997 Clinical Endoscopy Vol.17 No.5

Chronic idiopathic inflamatory bowel disease, espcaially Crohn's disease, is frequently complicated with low gastrointestinal stricture. Besides medical treatment of active inflammation, there is no specific, conservative approach to this complication, Repetitive surgery with extensive resections, leading to short bowel syndrome, is often necessary. Balloons have been used for a variety of gastrointestinal stenoses including esophageal, small intestinal, and colonic stricture. Balloon dilation offers many theoretical advantages (safety, and patient comfort) over dilation with bougies. Especially, the availability of large diameter balloon dilators, which pass through the biopsy channel of standard endoscopes (through-the scope balloon or TTS balloon), has promised efficient direct-vision dilatation of strictures without the need of guide wires or fluoroscope. We report a case of colonic Crohn's stricture dilated successfully using TTS balloon catheter.

크론병에서 발생한 급성 골수성 백혈병 1예

김지원,김유선,송인성,정현채,최규완,우광훈,차성덕,황진혁,변정식,김점룡 대한소화기학회 1998 대한소화기학회지 Vol.31 No.2

Various hematological disorders, including iron deficency anemia and thrombocytosis, are known as extraintestinal rnanifestations of Crohns disease (CD). In addition, recent studies suggest that incidence of leukemia is higher in patients with CD than in the normal population. In the literature review, thirteen cases of leukemia associated with CD have been described since 1980. The etiology of leukemia in CD seems to be multifactorial and may involve immunologic abnormalities associated with CD, exposure to diagnostic radiation or side-effects of immuno- suppressants. A thirty-one year old female patient was diagnosed to have CD in 1991 and treated with sulfasalazine, corticosteroid, azathioprine and metronidazole, and then developed leukocytosis, severe anemia and marked thrombocytopenia. A diagnosis of acute myelomonocytic leukemia was established by bone marrow cytology and biopsy. Chromosomal analysis of bone marrow aspirate revealed t (8:21) with loss of sex chromosome. In conclusion when the patients with CD develop leukocytosis, marked anemia and thrombocytopenia, we should consider the, possibility of leukemia.

다발성 림프종양 용종증(Multiple Lymphomatous Polyposis)1예

김지원,송인성,정현채,김철우,김정룡,방영주,차성덕,정준오,김찬규,이진혁,나상훈 대한소화기학회 1998 대한소화기학회지 Vol.31 No.6

Multiple lymphomatous polyposis (MLP) is a rare and unique clinical entity that manifest as multiple polyps occurring throughout the gastrointestinal tract. Unlike MALT-type lymphoma, MLP has a high tendency for extra-intestinsl spread and short mean survival time, The malignant cells of MLP share morphological, immunohistologic and cytogenetic similarity with cells of nodal-based mantle cell lympboma. We report a case of MLP that is presented with multiple polyposis affecting stomach, duodenum, small intestine and colon/rectum.

베체트 장염 환자에 있어 내과적 치료에 대한 반응도 , 경과 및 재발률에 대한 연구

김지원,송인성,정현채,최규완,김정룡,임영석,김주성,장동경,차성덕,김찬규 대한소화기학회 1998 대한소화기학회지 Vol.30 No.4

Background/Aims: In order to study the course of Behqets colitis, we evaluated the response to medical and surgical treatment of the patients with Behqets colitis. Methods: We analyzed 54 patients who were treated under the diagnosis of Behqets colitis for ten years between June, 1986 and December, 1996 at Seoul National University Hospital. Follow-up durations, symptoms, involved organs, involved sites, types of therapy, the response to therapy and response duration were evaluated. Results: With 29 male and 25 female patients, the male to female ratio was 1.16:1, and the mean age was 34 years. Post-therapy follow-up durations ranged from 3 months to 25 years with the mean being 59 months(±56 months). Most colonic lesions were found in the ileocecal area. 91% were found in the ileocecal rea, 28% in the ascending colon, 15% in the transverse colon, 13% in the descending colon, 13% in the sigmoid colon, and 2% in the rectum. Wben colonic lesions were classified according to location and multiplicity, localized solitaiy lesions accounted for 44%, diffuse multiple lesions were 31%, and localized multiple lesions were 24%. Among those who underwent meclical therapy initially, 74.4% had remission or improvement. In average it took 4 weeks to have a response and 31 months before recurrence occurred. After medical treatment 23% of the patients underwent surgical treatment due to intractablility. 44% of all patients underwent operation, total operation nwnber was 42. Causes of operation were as follows; int6stinal perforation 33%, uncertain diagnosis 26%, intractable abdominal pain 19%, intestinal fistula 12%, and intestinal obstruction 10%. Operation incidence rate was 15/100 person-year and the 5-year cumulative operation rate was 47%. Those who underwent multiple operations were 22% of all patients and 50% of operation cases. Operation rates of diffuse multiple lesions, localized multiple lesions, and localized solitary lesions were 29%, 31%, and 63%. Re-operation rates were 80%, 75%, and 33% each. Conclusions: Behqet's colitis is a chronic recurrent disease. When medical therapy was effective, the response occurred within 8 weeks. Five-year cumulative operation rate was 47%. Re-operations were more frequent in diffuse multiple lesions, and explorative operations for confirmative diagnosis were more frequent in localized solitary lesions. Operations due to intestinal perforation made up 33% of all operations, so when the patients with Behcet's colitis were aggravated, we should consider the possibility of intestinal perforation.