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고체산화물 연료전지용 디젤 자열개질기의 장기성능에 미치는 H<sub>2</sub>O/C와 O<sub>2/C</sub> 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.
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Simulation을 통한 Roll over Prevention System 개발에 관한 연구
윤상호(Sangho Yoon),구본경(Bonkyung Koo),고유석(Youseok Kou),정지현(Jihyun Jung),김동신(Dongshin Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Purpose of this work is to develop the rollover prevention system with UCC that is consisted of CDC and ESP. CDC system has roll control logic to reduce roll angle when a driver performs cornering event. ESP system needs the additional control logic for rollover prevention because it is ultimately developed to enhance vehicles' stability by controlling vehicle's yaw characteristic. For this reason, it is also required to investigate how vehicles' rollover occurs. On this study. simulation is performed to figure out what kind of factors directly causes vehicles' rollover. Simulation has a lot of advantages in this case. because real car test for rollover is so dangerous that a lot of safety equipment is required and too many sensors are needed to look into many factors which have possibility to cause rollover. In this paper, the effects of CDC and ESP for rollover prevention are studied. And also, the advantages of sensing eventual rollover and the importance of the additional rollover control function in UCC control logic are inferred in the result.
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우리에게 아파트의 의미는 무엇일까? : Q 방법론의 적용
윤상호(Yoon Sangho),박성용(Park Seong Yong) 한국상품학회 2007 商品學硏究 Vol.25 No.1
“과연 우리에게 아파트의 의미는 무엇일까?” 이러한 주제에 대한 의미를 이해하기 위해서는 소비자의 주관적 반응을 측정하여야 한다. 소비자의 주관적인 반응을 Q방법론적 진술문을 통해 객관화시켜서 소비자 유형을 알아보는 것이 이 논문의 주요 목적이다.<BR> 기존의 이론적 접근법은 주택가치를 주로 주거가치와 투자가치의 이분법적인 방법을 사용하였다. 이 논문에서는 기존의 연구를 바탕으로 이성적인 요인들과 감성적인 요인들로 나누어 주택가치 관련 문항들을 개발하였다. 이성적인 요인들과 감성적인 요인들로 구성된 34개의 주택가치 관련된 진술문을 Q방법으로 분석한 결과, 아파트를 소유 주거하는 사람들을 3가지 유형인 가치목적 추구형, 주거목적 추구형, 투자목적 추구형으로 나눌 수가 있었다. 이들 유형들 간의 상관관계는 높았고, 아파트의 경우에는 동일하게 인식하는 항목들의 경우에는 이성적인 요인들이 감성적인 요인들보다 훨씬 높음을 보여주었다. 구매가치, 주거가치, 자산가치의 유형별 평균에 있어서는 차이가 나지는 않지만, 회귀분석을 이용한 증분분석에서는 그 영향이 나타난다. "What does apartment mean to us?" In order to understand these kinds of topics, we need to measure the subjective responses of consumers. The main purpose of this paper is to identify the consumer taxonomy by objectivity of subjectivity of human minds. This can be achieved by Q-methodology.<BR> Previous research studies identified the value of housing as the combination of dwelling value and asset value. In this study, we develop 34 Q-sample cognitive and emotional questions related to housing value. The results show that there are three types of consumers: perceived-value-seeking, dwelling-value-seeking, asset-value-seeking type. These three types of consumers have high correlation so that we can conclude that people have very similar views on apartment. In particular, cognitive aspects are more emphasized that emotional aspects. Further analysis on the determinants of overall satisfaction of housing produce very similar results as Q-methodology results.
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광역자치단체 간의 행정통합과 재정변화 대구광역시를 중심으로
윤상호(Sang-Ho Yoon) 공공선택학회 2023 공공선택학저널 Vol.2 No.1
오우츠나 티부 모형에 의거한 공공선택론은 지방정부 간의 경쟁이라는 전제 하에 지방공공재의 공급에 최적화된 규모의 지방정부를 지지해 왔다. 그럼에도, 현재 한국에서는 자치단체를 유지하면서 주변 단체와의 협력을 강화하는 이른바 광역 행정(regional administration)을 넘어 아예 지방정부간의 경쟁이 사라지는 광역자치단체 간의 통합이 시도되고 있다. 본 논문은 활발히 논의가 이루어지고 있는 광역자치단체 간의 통합에 따른 재정 변화를 예측해보고자 한다. 광역자치단체 간의 통합은 비수도권 광역자치단체를 중심으로 수도권의 집중화 현상, 지방소멸 등에 대처하기 위한 수단으로 논의되고 있다. 반면 이러한 통합이 이루어질 경우 어떠한 재정변화 혹은 어떠한 재정적 문제가 야기되는지에 대한 논의는 거의 부재하다. 본 연구에서 수행된 분석에 따르면 통합에 따라 대구광역시의 보통교부세 세입이 총량적으로 감소할 것으로 예측된다. 따라서 재정특례 도입을 통해 재정적 변화를 대처할 수 있는 방안을 모색하는 것이 필요하다. Based on the logic of Oates and Tiebout, the theory of public choice has long supported the competition among the local governments. However, the consolidation of metropolitan local governments has arisen as the possible solution to resolve various problems that are faced by local governments although it may lead to a lesser competition among local government. This article analyzes the expected financial outcome of the consolidation between Daegu metropolitan city and Kyungbook province. After such a consolidation, total revenue of local taxes is expected to remain constant, while the internal structure of tax and the political status of local government will change. Some areas that are now in Kyungbuk’s autonomous district but would belong to Daegu after consolidation are sure to suffer decrease in local grant revenues. Therefore, some special measures are necessary to supplement this financial loss. Special treatments will be required in general adjusted grants, local tax items, immunity from disadvantages imposition rule, and flexible operation of stipulated local grants rate.
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윤상호(Sang Ho Yoon),천은경(Eun Kyung Chun),심순섭(Soon Sup Shim),임준희(June Hee Lim),박중신(Joong Shin Park),전종관(Jong Kwan Jun),윤보현(Bo Hyun Yoon),신희철(Hee Chul Syn) 대한산부인과학회 2002 Obstetrics & Gynecology Science Vol.45 No.7
Objective : To assess the pregnancy outcomes complicated by maternal heart diseases. Methods : From 1994 to 2001, medical records of pregnant women who had reached at least 20 weeks of gestation with maternal heart diseases were reviewed. Results : 224 deliveries of 195 women were enrolled in this study. In 117 (52.2%) cases the heart diseases were of rheumatic origin, in 96 (42.9%) cases congenital, and the remaining 11 (4.9%) cases were miscellaneous group that included arrhythmia, cardiomyopathy, and mitral valve prolapse. There were 2 (0.9%) cases of maternal death related to pregnancy. Majority (91.9%) were in New York Heart Association functional classes I, Ⅱ before, during, and after delivery. Mean gestational age at birth and birth weight were 37.9 weeks and 2883 gm. Perinatal mortality rate was 17.9/1000 and the rate of congenital malformation was 2.7%. Recurrence risk of neonatal congenital heart disease was 2.1%. Conclusion : Most complications were developed in the pregnancies complicated by maternal heart diseases with New York Heart Association functional classes Ⅲ, Ⅳ. Functional status of the pregnant women is the important risk factor in maternal and fetal outcomes.
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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.
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