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대장 용종에 국한되어 발생한 랑게르한스 세포 조직구증 1예
서현웅 ( Hyun Woong Seo ),한군희 ( Koon Hee Han ),김성훈 ( Sunghun Kim ),홍만용 ( Man Yong Hong ),윤정호 ( Jung Ho Yun ),엄대운 ( Dae Woon Eom ),천갑진 ( Gab Jin Cheon ) 대한내과학회 2013 대한내과학회지 Vol.84 No.5
A 56-year-old male underwent a screening colonoscopy. An 8-mm sessile polyp was removed from the descending colon using snare polypectomy. Histology showed Langerhans cells and eosinophil infiltration of the submucosa. Immunohistochemical stain-ing was positive for S-100 protein and CD1a antigen, which confirmed the diagnosis of Langerhans-cell histiocytosis. On further workup, there was no evidence of involvement of any other organs. Here, we report a very rare case of colonic Langerhans-cell his-tiocytosis presenting as an isolated polyp. (Korean J Med 2013;84:704-707)
염료감응형 태양전지의 투명 전극 식각을 통한 효율 향상 연구
서현웅(Seo, Hyun-Woong),손민규(Son, Min-Kyu),이경준(Lee, Kyoung-Jun),김정훈(Kim, Jeong-Hoon),김희제(Kim, Hee-Je) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05
Dye-sensitized solar cell using transparent conducting oxide as electrode has large resistance such as surface resistance, charge transportation impedance in counter electrode and electrolyte, impedance between each interface. Among that resistances, surface resistance of transparent conducting oxide is relatively large. So the change of transparency has a large effect on internal resistance of dye-sensitized solar cell. Consequently, that change cause to increase or decrease the conversion efficiency. We tried to reduce the surface resistance by laser-scribing. The active area is seperated from total transparent conducting oxide by Nd:YAG laser-scribing. As a result, we achieved the improvement of efficiency about 7% and 11% in case of 0.25cm² and 1.00cm² dye-sensitized solar cells.
염료감응형 태양전지의 병렬 연결에서 발생하는 전류 손실 분석
서현웅(Seo, Hyun-Woong),이경준(Lee, Kyoung-Jun),손민규(Son, Min-Kyu),홍지태(Hong, Ji-Tae),김희제(Kim, Hee-Je) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05
In a research on the practical dye-sensitized solar cell, a study on a large module have preference because module must be able to generate the proper current that is possible to convert electrically. So the parallel connection of dye-sensitized solar cells which outputs a large current easily is essential. However, there is a current loss in a paralle connection of dye-sensitized solar cells and the loss becomes larger according to increasing the number of parallel connection. In this study, we analyzed the cause of the current loss in the parallel connection by using the equivalent circuit analysis. One DSC used in this experiment had an active area 8cm²(4.62cmtimes1.73cm) and it attained a conversion efficiency of 5.43% under 1 sun illumination (P_{in} of 100 mW/cm²) using a solar simulator.
서현웅(Seo, Hyun-Woong),김미정(Kim, Mi-Jeong),손민규(Son, Min-Kyu),이경준(Lee, Kyoung-Jun),홍지태(Hong, Ji-Tae),김희제(Kim, Hee-Je) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.11
In this study, we have attempted a new method to enhance the coloring of dye on the TiO₂ surface in the dye sensitized solar cell. In the conventional coloring process in a dye sensitized solar cells, dye is absorbed by the covalent bond between TiO2 and dye molecule while the photo-electrode coated with TiO₂ layer is soaked in dye solution for about 12-24 hours. But this process takes long time, so we have researched more effective and faster way than the conventional process by applying electric field. Three kinds of electric power such as direct voltage, alternating voltage and pulse voltage were applied to the transparent conducting oxide during the coloring process. As a result, we achieved improved power, fill factor and efficiency of dye-sensitized solar cell in case of applying direct voltage and pulse voltage. In contrast, alternating voltage tend to reduce the dye adsorption on the TiO₂ surface and hence the efficiency. We measured the absorption spectra of dye by UV-VIS spectrophotometer before and after soaking the TiO₂ in the dye and found no characteristic change in the dye was observed. In this study, we researched on shortening time of coloring process which spent much time in the whole process.
서현웅(Seo, Hyun-Woong),손민규(Son, Min-Kyu),이경준(Lee, Kyoung-Jun),장진주(Jang, Jin-Ju),홍지태(Hong, Ji-Tae),김희제(Kim, Hee-Je) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.10
Dye-sensitized solar cells (DSCs) have been proposed as a substitute for overcoming the limitation of Si solar cells because DSC has the various applications using advantages of DSC such as low cost, transparency and flexibility. Although some people point out low efficiency of DSC as the important problem at present, general views say that actually cumulative power is not insufficient as compared with Si solar cell. Therefore, we analyzed the characteristics of both cells according to the change of incident angle in this study. The insensibility about the incident angle has more developable time. Finally, DSC is able to fill a shortage of power caused from low efficiency of DSC for same time by developing during impossible time to develop in Si solar cell. As a result, DSC has 75% and 210% cumulative power of Si solar cell in summer and winter under the standard sunshine duration.
서현웅 ( Hyun Woong Seo ),유승훈 ( Seung Hoon You ),장경희 ( Kyeong Hee Jang ),이정화 ( Joung Hwa Lee ),최종수 ( Jong Soo Choi ),강길현 ( Gil Hyun Kang ),오호석 ( Ho Suk Oh ) 대한내과학회 2011 대한내과학회지 Vol.81 No.2
Meningeal carcinomatosis in patients with prostate cancer is very rare. Recently, we experienced a case of meningeal carcinomatosis in a patient with prostate cancer. He had undergone a radical prostatectomy 11 years before presentation and had undergone chemotherapy 4 years before presentation due to bone metastases. This time, he visited the emergency department because of a seizure. Although cerebrospinal fluid (CSF) examinations did not reveal malignant cells, we diagnosed meningeal carcinomatosis based on positive CSF prostate-specific antigen and magnetic resonance imaging (MRI) findings. The diagnosis was confirmed pathologically. We treated the patient with whole brain radiotherapy and intrathecal chemotherapy. We report a case of prostate cancer with meningeal carcinomatosis with a literature review. (Korean J Med 2011;81:262-265)
DSC(Dye-sensitized Solar Cell)의 Grid 간격 변화에 따른 광전특성 연구
서현웅(Seo, Hyun-Woong),김미정(Kim, Mi-Jeong),최진영(Choi, Jin-Young),홍지태(Hong, Ji-Tae),박성진(Park, Sung-Jin),김희제(Kim, Hee-Je) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.06
A lot of researches and experiments have been performed to make more efficient dye-sensitized solar cell. Among them, insertion of a grid electrode in DSC is one method to increase overall performance as being shortened distance of electrons' movement by diffusion. In this paper, we measured overall characteristics which is included voltage-current characteristic curve, efficiency, fill factor by comparison between DSC without and with grid electrode. As a result, we got maximum 1.8 times increase of efficiency and approximately 1.7 times rise of fill factor. And we experimented 8, 10, 12, 14mm of grid gap and compared their results to optimize grid gap which is able to incite the most effective movement of electrons. Consequently, we got the result that electrons' movement is the most effect ive when grid gap is approximately 12mm.
설탕을 첨가한 Polyethylene Glycol 용액의 장정결 효과 및 복용 순응도
서현웅 ( Hyun Woong Seo ),한군희 ( Koon Hee Han ),김성훈 ( Sung Hun Kim ),박종규 ( Jong Kyu Park ),김영돈 ( Young Don Kim ),정우진 ( Woo Jin Jeong ),이상진 ( Sang Jin Lee ),서현일 ( Hyun Il Seo ),송윤아 ( Yun A Song ),최서현 ( Seo 대한소화기학회 2013 대한소화기학회지 Vol.61 No.2
목적: PEG 용액은 안전하고 정결 효과가 우수하여 현재 임상 에서 대장내시경 전처치제로 가장 널리 사용되고 있지만, 특 유의 짠맛으로 환자의 순응도가 낮다는 제한점이 있다. 이번 연구는 이러한 단점을 보완하기 위해 표준 PEG 용액에 설탕 을 첨가하여 복용하도록 한 후 대장 정결 효과 및 환자 순응도 를 표준 PEG 용액을 복용한 군과 비교 분석하고자 하였다. 대상 및 방법: 2012년 1월부터 6월까지 강릉아산병원 소화기 내과에서 대장내시경을 시행받은 총 100명의 환자들에 대해 무작위 전향적 대조 연구를 진행하였다. 대장 정결은 표준 PEG 용액 4L 또는 설탕을 첨가한 PEG 용액 4 L 중 한 가지 로 무작위 배정하였다. 시술자 설문지를 통해 대장 정결도와 내시경의의 검사만족도를 조사하였고, 환자 설문지를 통해 순 응도를 조사하였다. 결과: 두 군 사이에 대장 정결도(4.2±2.0 vs. 4.1±1.5, p=0.783)와 내시경의의 검사만족도(8.2±1.8 vs. 8.5±1.3, p=0.253)는 유의한 차이가 없었으나 환자의 역겨움의 정도 는 설탕첨가 PEG군이 3.9±2.9로 표준 PEG군 6.4±2.3과 비교하여 볼 때 역겨움의 정도가 낮았으며(p<0.05), 같은 방 법으로 재검사하겠다는 응답도 설탕첨가 PEG군이 2.3±0.7 로 표준 PEG군 2.0±0.6보다 높았다(p<0.05). 전처치제를 복용하면서 느낀 주관적 불편감은 두 군 사이에 유의한 차이 가 없었다. 결론: 설탕을 첨가한 PEG 용액은 효과적인 대장내시경 전처 치 방법이며 표준 PEG 용액을 복용할 때 짠맛으로 인해 복용 의 어려움을 호소하는 환자에게 좋은 대안이 될 수 있을 것으 로 기대된다. Background/Aims: Although polyethylene glycol (PEG) solution is commonly used for colonoscopic bowel preparation because of its safety and effectiveness, its salty taste decreases patient`s compliance. The aim of this study was to compare the sugared PEG solution with the standard PEG solution in regard to the quality of bowel preparation and patient`s compliance. Methods: From January through June in 2012, 100 patients who underwent colonoscopy in Gangneung Asan Hospital were prospectively enrolled. They were randomly assigned to receive either standard PEG solution or sugared PEG solution. The quality of bowel preparation was assessed by a doctor`s questionnaire and the patient`s compliance was assessed by a patient`s questionnaire. Results: There was no significant difference in the quality of bowel preparation (4.2±2.0 vs. 4.1±1.5, p=0.783), and endoscopist`s satisfaction score (8.2±1.8 vs. 8.5±1.3, p=0.253) between two groups. However, The degree of disgust was lower in the sugared PEG group than the standard PEG group (6.4±2.3 vs. 3.9±2.9, p=0.000). The willingness to repeat same regimen was higher in the sugared PEG group than the standard PEG group (2.0±0.6 vs. 2.3±0.7, p=0.004). There was no difference in side effects between two groups. Conclusions: The sugared PEG solution as a bowel preparation method revealed a higher patient`s compliance and was effective as the standard PEG solution. When the patient dislike the taste and saltness of the standard PEG solution, the sugared PEG solution will be good alternative method.
염료감응형 태양전지의 광전극 확장에 따른 광전특성 연구
서현웅(Seo, Hyun-Woong),김미정(Kim, Mi-Jeong),박제욱(Park, Je-Wook),김호성(Kim, Ho-Sung),김희제(Kim, Hee-Je) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
The field of dye-sensitized solar cell (DSC) is being researched actively at present. Because DSC has several advantages to pass the limits of Si solar cells such as a low manufacturing expense, a simple manufacturing process and its transparency. A lot of researches are underway about materials and processes in the field of dye-sensitized solar cell but its structure has been fixed up as the sandwich structure that both edges are used as positive and negative terminals. But the structure as of present is a factor of decreasing efficiency because the more electrons are recombined the further distance from terminal, considering about the characteristic of dye-sensitized solar cell that electrons generated inside cell are moved by diffusion. In this study, we made experiment on expanding the terminal to shorten internal moving distance of electron and compared the results according to the variation of active area to find out the effect of this trial. As a result, we achieved about 15.5% improvement of maximum power and 0.5% improvement of efficiency from terminal-expanded dye-sensitized solar cell of 2cm^{2} active area and concluded that the increasing rate of efficiency is raised as the active area becomes wider.