조기난소부전의 유전학

윤상호,최영민,Yoon, Sang-Ho,Choi, Young-Min 대한생식의학회 2007 Clinical and Experimental Reproductive Medicine Vol.34 No.4

고체산화물 연료전지용 디젤 자열개질기의 장기성능에 미치는 H₂O/C와 O_2/C 몰 비의 영향

윤상호,강인용,배규종,배중면,Yoon, Sang-Ho,Kang, In-Yong,Bae, Gyu-Jong,Bae, Joong-Myeon 한국전기화학회 2007 한국전기화학회지 Vol.10 No.2

고온형 연료전지인 고체산화물 연료전지(solid oxide fuel cell, SOFC)는 연료에 대한 유연성(fuel flexibility)이 높다. 따라서 높은 에너지 밀도를 가진 디젤을 개질하여 SOFC를 운전하는 것은 효과적인 방법이다. 하지만 디젤이 가지는 특성으로 인해 디젤 자열개질기(autothermal refromer)는 운전 시간에 따라 탄소 침적(carbon deposition) 현상이 발생하여 개질기의 성능이 쉽게 저감된다. 개질기 성능 저감 현상 때문에 개질 가스들 중에 탄화수소 생성량이 많아지며, 이는 SOFC 성능도 저감시킨다. 이러한 현상은 연료극에 공급되는 탄화수소가 야기하는 탄소 침적으로 사료된다. 본 연구에서는 탄화수소가 SOFC에 주는 성능 저감을 확인하였으며, 연료전지 성능 저감을 줄이기 위한 디젤 자열개질기 반응물들의 조건 선정($H_2O/C$와 $O_2/C$의 몰 비)을 통해 디젤 자열 개질기 특성을 살펴보았다. 특히 $H_2O/C=0.8$과 $O_2/C=3$인 디젤 자열개질 반응 조건에서 좋은 개질 성능을 확인할 수 있었다. Solid oxide fuel cell(SOFC) has high fuel flexibility due to its high operating temperatures. Hydrocarbonaceous fuels such as diesel has several advantages such as high energy density and established infrastructure for fuel cell applications. However diesel reforming has technical problems like coke formation in a reactor, which results in catastrophic failure of whole system. Performance degradation of diesel autothermal reforming (ATR) leads to increase of undesirable hydrocarbons at reformed gases and subsequently degrades SOFC performance. In this study, we investigate the degradation of SOFC performance(OCV, open circuit voltage) under hydrocarbon(n-Butane) feeds and characteristics of diesel performing under various ratios of reactants($H_2O/C,\;O_2/C$ molar ratios) for improvement of SOFC performance. Especially we achieved relatively high performance of diesel ATR under $H_2O/C=0.8,\;O_2/C=3$ condition.

공공사업시행으로 인한 인근주변지역의 파급효과에 관한 연구

윤상호 ( Sang Ho Yoon ) 한국지방행정연구원 1992 地方行政硏究 Vol.7 No.1

디젤 자열개질기 내 탄소침적에 관한 연구

윤상호(Yoon, Sang-Ho),강인용(Kang, In-Yong),배중면(Bae, Joong-Myeon) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06

Diesel autothermal reforming(ATR) is an effective method for hydrogen production. But, diesel ATR has several problems such as the sulfur poisoning of catalyst and carbon deposition during reforming reactor. Especially, carbon deposition is a severe problem, which causes rapid performance degradation, in the reforming reaction. Ethylene among the reformate gas is a carbon precursor. Effective decomposition of ethylene is an important issue. In this paper, we investigated the carbon deposition from ethylene in the reforming reaction for proper reaction condition of diesel ATR. We achieved relatively high performance of diesel ATR under H_{2}O/C=0.8, O_{2}/C=3 condition that was based on the experiment of ethylene reforming reaction.

난자공여시술의 결과에 영향을 미치는 임상적 인자에 관한 연구

윤상호 ( Sang Ho Yoon ),김진주 ( Jin Ju Kim ),민응기 ( Eung Gi Min ),김석현 ( Seok Hyun Kim ),최영민 ( Young Min Choi ),김정구 ( Jung Gu Kim ),문신용 ( Shin Yong Moon ) 대한산부인과학회 2008 Obstetrics & Gynecology Science Vol.51 No.9

목적: 난자공여시술에서 공여자의 연령을 포함한 난자공여시술의 결과에 영향을 미칠 수 있는 임상적 인자들에 대하여 알아보고, 또한 자궁내막수용성 평가에 이용되고 있는 자궁내막 두께와 내막형태의 초음파 소견이 임신의 예측가능지표로서 의미를 가질 수 있는지 살펴보고자 하였다. 방법: 1992년 3월부터 2004년 2월까지 서울대학교병원 불임클리닉에서 난자공여시술을 시행받은 85명의 환자, 109주기를 대상으로 연구를 시행하였다. 임신군과 비임신군, 공여자의 연령, 수혜자의 연령, 자궁내막 두께 및 형태에 따른 임상적인 특징들을 후향적으로 비교하였으며, 통계적인 처리는 Student t-test와 One way ANOVA 그리고 Chi-square test를 시행하였다. 결과: 임상적 임신율은 주기당 38.5% (42/109), 환자당 48.2% (41/85)였다. 임신군과 비임신군 사이에 수혜자의 연령이나 자궁내막의 두께 및 형태, hCG 투여일의 혈중 에스트라디올 농도, 획득된 난자의 개수, 수정률, 누적배아지수, 수혜자의 체질량지수등은 통계적으로 유의한 차이가 없었으나, 공여자의 나이에 유의한 차이가 있었다 (30.2±3.6 vs 32.1±4.3, P=0.017). 공여자의 나이에 따라 대상군을 세분하여 분석해보면 hCG 투여일의 혈중 에스트라디올 농도, 획득된 난자의 개수와 수정률은 35세 이상군에서 유의하게 낮았으며, 임상적 임신율은 30세 미만군에서 35세 이상군에 비해 유의하게 높았다 (50.0% vs 18.2%, P=0.015). 또한 자궁내막 두께에 따른 임신율은 <7 mm군, 7~9 mm군, 10~13 mm군, ≥14 mm군에서 각각 50.0%, 38.1%, 42.9%, 11.1%였으며, 자궁내막 형태에 따른 임신율은 삼중층구조군과 비삼중층구조군에서 각각 41.6%, 31.3%로 나타나, 자궁내막 두께와 형태 모두 임신율에 유의한 차이는 없었다. 결론: 난자공여시술에서 임신을 예측할 수 있는 가장 신뢰할만한 인자는 공여자의 연령이었고, hCG 투여일에 질식초음파로 측정한 자궁내막의 두께나 삼중층 구조는 임신가능성의 예측지표로서 의미를 가지지 못하는 것으로 나타났다. 수혜자의 연령이나 누적배아지수 또한 임신율에 유의한 영향을 미치지는 않는 것으로 나타났다. Objective: Oocyte donation cycle has been a useful model for the assessment of potential factors affecting human pregnancy, such as uterine receptivity or oocyte quality. The purpose of this study was to investigate variable clinical factors affecting the outcomes of oocyte donation cycles. Methods: This study reviewed 109 cycles of 85 women who underwent oocyte donation in SNUH infertility clinic from March 1992 to February 2004. Variable clinical characteristics were compared between pregnant and non-pregnant group. Data was evaluated by student`s t-test, oneway ANOVA, and Chi-square test. Results: Clinical pregnancy rate was 38.5% per cycle and 48.2% per recipient. When pregnant and non-pregnant groups were compared, there was a significant difference in donor age between both groups. (30.2±3.6 vs. 32.1±4.3, P=0.017). On the other hand, there were no significant differences in mean age, BMI, gravidity of recipient, and peak estradiol level of donor. The number of oocytes retrieved, embryos transferred, fertilization rate, and cumulative embryo score were not different between pregnant and non-pregnant group. Among the various donor age groups, clinical pregnancy rate was significantly higher in <30 years group than ≥35 years (50.0% vs 18.2%, P= 0.015). There were no significant differences for both endometrial thickness and pattern in the pregnancy rate during the IVF-ET cycles by ovum donation. Conclusion: The most reliable predictive factor for pregnancy in oocyte donation cycles is the age of oocyte donor. The mid-cycle endometrial thickness and trilaminar patterns are insignificant predictors. The age of recipient and cumulative embryo score are also insignificant factors.

안정적인 SOFC 운전을 위한 디젤 개질기 내 미반응 저탄화수소 제거법

윤상호(Yoon, Sang-Ho),배중면(Bae, Joong-Myeon),이상호(Lee, Sang-Ho) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06

In this paper, new concept of the diesel fuel processing is introduced for the stable operation of solid oxide fuel cells (SOFCs). Heavier hydrocarbons than CH₄, such as ethylene, ethane, propane, and etc., induce the carbon deposition on anode of SOFCs. In the reformate of heavy hydrocarbons (diesel, gasoline, kerosene, and JP-8), concentration of ethylene is usually higher than low hydrocarbons such as ethane, propane, and butane. So, removal of low hydrocarbons (over C1-hydrocarbons), especially ethylene, at the reformate gases is important for stable operation of SOFCs. New methodology as named post-reformer is introduced for removing the low hydrocarbons at the reformate gas stream. Catalyst of the NECS-PR4 is selected for post-reforming catalyst because the catalyst of NECS-PR4 shows the high selectivity for removing low hydrocarbons and achieving the high reforming efficiency. The diesel reformer and post-reformer are continuously operated for about 200 hours as integrated mode. The reforming performance is not degraded and low hydrocarbons in the diesel reformate are completely removed.

액상 연료 용 kW_e급 SOFC 시스템 사전 연구 및 개발

윤상호(Yoon, Sang-Ho),김선영(Kim, Sun-Young),배중면(Bae, Joong-Myeon),백승환(Baek, Seung-Whan) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.10

We have developed a kW_e class liquid fuel based solid oxide fuel cell (SOFC) system. Our final target is to develop the 1 kW_e diesel based SOFC system for residential power generator(RPG). In this study, we present the conceptual design of SOFC system. System is composed of hot-box and cold-box. Planar typed SOFC stack, heat exchanger, combustor for stack tail gas, and fuel processor, such as fuel reformer and desulfurizer, are contained in the hot-box. And several balance of plants(BOP), such as fuel suppliers and controller, are contained in the cold-box. Before the SOFC system fabrication, we have already operated the selfsustaining fuel processor, and heat exchange of all heat-related components is simulated using ASPEN HYSYS, because heat maintenance and management in hot-box are important for stable operation of SOFC system. The self-sustained fuel processor was successfully operated for about 250 hours, and heat exchange is enough to operate the SOFC system.

베큠인퓨전 공법 적용을 위한 보트생산 공정 융합 장치

윤상호(Yoon Sang-Ho),무하마드 아야즈(Muhammad Ayaz),김현직(Kim Hyun Jig),이정태(Lee Jung-Tae),홍민영(Hong Min-Young),임은아(Lim Eun-A),임원빈(Lim Won-Bin),라팟오스만(Rafat Hamood Othman Saeed),조상(Zhao Xiang),윤달환(Yoon Dal-Hwan),이철호 대한전자공학회 2019 대한전자공학회 학술대회 Vol.2019 No.11

By developing the method of vacuum infusion construction on based on the boat manufacturing convergence system, which can be obtained for the safety and quality advancement of the boat. Especially, the precise mixing rate of resinoid and curingagent to inject in an inner ship and deck at short time is very important, which are the best fundamental conditions to decide the stronger boat in the water. So, in this paper, we propose the method of the vacuum infusion construction that applicable for the optimal condition to make a strengthen boat bottom by several components. This one can solve the post deformability of the strengthen structure and can control the precise mixing rate of resinoid and curingagent to the resinoid fluidity and flowing rate per time. Under these condition,

자립형 1kW_e 액체 연료 개질기 운전에 관한 연구

윤상호(Yoon, Sang-Ho),배규종(Bae, Gyu-Jong),배중면(Bae, Joong-Myeon) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05

Liquid hydrocarbon fuels, such as gasoline, kerosene, diesel and JP 8, can be good candidates for SOFC (solid oxide fuel cell) system fuel due to their high hydrogen density. Autothermal reforming (ATR) is suitable for liquid hydrocarbon fuel reforming because oxygen can decompose the aromatics in liquid fuel and steam can suppress the carbon deposition during catalytic reaction. The advantage of ATR is that it has a simple system construction due to exothermicity of ATR reaction. We control the exothermicity of reaction, make the reaction possible design a self-sustaining ATR reactor. A self-sustained 1kW-class kerosene autothermal reformer is introduced in this paper. The 1kW-class kerosene reformer was continuously operated for about 140 hours without degradation of reforming performance.

수산식품 가공업의 효율성 분석

윤상호 ( Sang Ho Yoon ),박철형 ( Cheol Hyung Park ) 한국수산경영학회 2015 수산경영론집 Vol.46 No.2

This study is to analyze the efficiency of Korean sea food manufacturing using Data Envelopment Analysis. Firstly, based on an output oriented traditional CCR, BCC model, the study estimated the efficiency scores. The average estimates of technical, pure technical, and scale efficiency turned out 0.6517, 0.7184, 0.9074 respectively, which are separated for 50 marine corporations. The 10 DMUs were efficient under CCR model while the 17 DMUs under BCC model. Also, the study suggested that the operating profit of the two output factors should be more increased relatively and averagely from the viewpoint of efficiency improvement. Secondly, super efficiency scores are estimated under super efficiency and SBM model. As a result, it came to be possible to distinguish and rank the efficiency of the efficient DMUs. The highest score was 4.2975 under Super-CCR, was 2.4947 under Super-BCC, was 2.7160 under SBM-Super- CCR, and was 1.5319 under SBM-Super-BCC model. The average estimates of super efficiency were 0.76 and 0.82 under Super-CCR and Super-BCC model respectively, and were 0.61 and 0.67 under SBM-Super- CCR and SBM-Super-BCC model. Finally, the study conducted a rank-sum test, Wilcoxon-Mann-Whitney test, to find a statistical significance of heterogeneity existing in efficiencies among the sample corporations. The result showed that there was a significant difference in average efficiency between Dried, Salted product manufacturing and Frozen product manufacturing under BCC-Super efficiency model at 10% level of significance. Furthermore, TOBIT model was applied to find out the potential factors that might influence the efficiency, Wilcoxonand the results showed debt and sales cost influenced all of the technical, pure technical, and scale efficiency, while net profit influenced only the technical efficiency.