상이한 스펙트럼을 가지는 객체간의 RGB 색상 차이를 최대학화기 위한 최적조명

서동균,이문현,서병국,박종일,Seo, Dong-Kyun,Lee, Moon-Hyun,Seo, Byung-Kuk,Park, Jong-Il 대한의용생체공학회 2009 의공학회지 Vol.30 No.3

An object's color and intensity are determined by its spectral reflectance and illumination. Therefore, the illumination plays a key role in forming the appearance of the object in a scene. In this paper, we focus on color distinction of objects and derive the optimal illumination conditions to maximize the distance between objects in the RGB color space. As a practical approach the optimal illumination is composed by deriving the optimal linear combinations given a set of LED light sources. The effectiveness of our approach is shown through experimental results using an endoscope system.

상용급 가스터빈에서 셰일가스 파일럿비 영향에 관한 수치해석적 연구

서동균,주용진,박세익,김미영,신주곤,Seo, Dong Kyun,Joo, Yong-Jin,Park, Seik,Kim, Mi-yoeng,Shin, Jugon 한국전력공사 2019 KEPCO Journal on electric power and energy Vol.5 No.3

논문에서는 상용급 가스터빈을 대상으로 해서 셰일가스를 연료로 공급할 때 유동 및 연소특성을 3-D 수치해석적 방법으로 구하였다. 이 때, Standard k-e 난류모델, 2단 메탄산화반응, Finite rate/Eddy dissipation 반응모델, DTRM 복사모델이 사용되었고, 기준조건(도시가스, PR 0.07)에서 출구 측에서 형성되는 온도는 이전 문헌 값과 비슷한 값을 보였다. 위 모델을 바탕으로 해서 연료조건으로 기존의 도시가스 외에 세 가지 셰일가스 조건(도시가스 대비 열량기준 80%, 90%, 105%)을 선정하였고, 각 연료조건에 대하여 세 가지 연료분사조건(PR=0.7, 0.9, 0.11)에 대한 해석을 수행하였다. 해석결과, 모든 셰일가스 연료공급 조건에 대하여 도시가스 대비 온도 혹은 NOx 측면에서 연소안정화를 만족하였다. 또한 모든 조건에 대해서 PR이 증가할수록 출구측 평균온도는 일정했지만 NOx량은 증가하였다. 이는 파일럿비가 증가할수록 상대적으로 확산연소가 증가했기 때문이다. In this work, the flow and combustion characteristics using a 3-D numerical simulation was evaluated for a shale gas fueled combustor in a commercial class gas turbine. The Standard k-e turbulence model, 2 step methane oxidation mechanism, Finite rate/Eddy dissipation reaction model, DTRM radiation model were employed and validated well at the baseline condition (Natural Gas, Pilot Ratio 0.2). Based on the validated models, the combustion characteristics of shale gas was evaluated for three pilot ratios cases. It was found that NOx concentrations for all shale gas cases were less than the that for city gas, which imply that, at the selected PRs, the condition for combustion stability is satisfied. In addition, for higher PR, whereas the average temperatures at the exit are the same, the NOx increases. It means that diffusion combustion portion increases due to the higher PR.

복합계통 개조를 위한 가스화 폴리제너레이션 시뮬레이션 연구

서동균,주용진,홍진표,김경래,이정박,Seo, Dong-Kyun,Joo, Yong-Jin,Hong, Jin-Phyo,Kim, Kyung-Rae,Lee, Jeong-Bak 한국전력공사 2017 KEPCO Journal on electric power and energy Vol.3 No.2

In this work, a simulation study on net 500 MW class of Poly-Generation was conducted for the retrofit of an aged natural gas combined cycle. An entrained gasifier which has a capacity of maximum $260,000Nm^3/h$, 50 MW class of a Polymer Electrolyte Membrane Fuel Cell, and H-class Gas Turbine were selected as key processes. After unit design for those employed processes was set up and combined, the simulation was carried out with Gate-Cycle software (Ver. 6.0) for two cases. The selected cases are a retrofit type (Poly-Gen 1) and a new type (Poly-Gen 2). It was found that the efficiency of the retrofit case is 2.7% lower than that of the new case.

비둘기 유래(由來) 대장균(大腸菌)의 생물학적(生物學的) 특성(特性)에 대하여

서동균,최원필,박노찬,Seo, Dong-kyun,Choi, Won-pil,Park, No-chan 대한수의학회 1990 大韓獸醫學會誌 Vol.30 No.4

The purpose of this study was to examine O serotypes, colicin and hemolysin production. antibiotic susceptibility and haemagglutinating ability to animal erythrocytes among Escherichia coli strains isolated from pigeons in Taegu province. Of the 166 strains isolated, 28 strains (16.9%) were classified into 6 O serotypes and their types were O20(42.9%), O15(17.9%), O139(14.3%), O101(10.7%), O149(7.1%) and O8(7.1%). Of the 166 strains isolated, none was hemolytic and 3(1.8%) were colicinogenic. Antibiotic susceptibility test of Escherichia coli isolates was performed by the agar dilution method, using ampicillin, chloramphnicol, gentamicin, rifampicin, streptomycin (Sm), nalidixic acid, sulfadimethoxine and tetracycline (Tc). Forty four strains (26.5%) were resistant to one or more drugs and the most common resistance patterns were SmTc (27.3%). Of the 44 drug resistant strains, 6 strains haemagglutinated erythrocytes of chicken, guinea pig and 2 of the 6 strains agglutinated goose erythrocytes.

고온수소 전환 반응기에 관한 수치해석적 연구

서동균,이진향,지준화,홍진표,오석인,SEO, DONG-KYUN,LEE, JIN-HYANG,CHI, JUN-HWA,HONG, JIN-PYO,OH, SUK-IN 한국수소및신에너지학회 2018 한국수소 및 신에너지학회논문집 Vol.29 No.4

In this study a numerical study was conducted to show flow, temperature and gas distributions in a high temperature CO shift reactor which was designed specially for energy saving and then evaluated with the related experiment. Mole fractions of syngas at the end of the catalyst bed were predicted with various assumed pre-exponential factors, were compared with the corresponding experimental results and $10^8$ was finally selected as the value. With the selection, a base case was examined. It was calculated that the inlet duct attached asymmetrically to the CO shift reactor affects on the distribution of the upward momentum (+z directional). In addition, CO conversion ratio is achieved up to 90% in the catalyst bed and especially it reached up to 70% at the initial part of catalyst bed.

韓國 運送서비스貿易의 國際競爭力과 比較優位 決定要因-貨物運送, 旅客輸送, 其他運送를 중심으로-

서동균(Seo Dong-Gyun),최문혁(Choi Moon-Chan) 한국항만경제학회 1998 韓國港灣經濟學會誌 Vol.14 No.-

The purpose of this paper is to analyze the service-orientation of the economy and the import/export structure of the trade in services of Korea. so, this paper conduct an empirical study on the comparative advantage determinant factor in connection to the trade in services, while studying how the comparative advantage determinant factors changed structurally. Not only will the results of this study contribute in minimizing the shock of the market opening in the service industry of Korea, it will also help in establishing an effective plan to face up to the foreign inflow as well as providing a basis to prepare the development plans for the Korean service industry and determine an effective opening date.<br/> An empirical study was conducted through theoretical studies and quantitative analysis using documents to achieve the research goals of this paper. For the theoretical study, the concept and various characteristics of the service and trade in services was studied through domestic and foreign thesis papers and literatures, and an effort was made to present a theoretical basis for the empirical study on whether it is possible to apply the traditional comparative advantage theory to the trade in services as well. Next, studies were done to find the affect on the structure of the trade in services in Korea by determining the international competitiveness of the trade in services and its structure.<br/> When the results of the empirical study of the comparative advantage determinant factors for the trade in services of Korea were consolidated, it was discovered that the physical capital and human capital were the comparative advantage determinant factors for shipments, GNP per capita and technical factors were for passenger service, economy of scale was for other transportation<br/> The following methods are presented with the results of the comparative advantage study to develop the service industry of Korea and increase its competitiveness. First, as there is a comparative advantage in the shipment area if there is an adundance of physical capital and human capital, it is essential to increase the number of skilled labor. Therefore, the policy makers will need to give special benefits to graduates of technical schools, colleges and graduate schools, or enforce on site training of employees of companies to increase the number of human capital (skilled labor) oriented labors.

DEA모형을 이용한 부산항 배후물류시설 ODCY의 운영효율성 분석

서동균(Donggyun Seo) 한국항만경제학회 2011 韓國港灣經濟學會誌 Vol.27 No.4

본 연구의 목적은 부산항의 12개 ODCY를 대상으로 DEA분석을 실시하여 운영효율화 방안을 제시하는 것이다. 부산항 ODCY의 중요성에 비해 이에 대한 연구는 거의 전무하여 본 연구를 통해 ODCY의 필요성을 제시하고 운영효율화 방안도 제시하였다. 분석에 사용된 투입요소는 CY면적,종사자수, 하역장비 대수를 선정하였고, 산출요소는 컨테이너처리량을 사용하였다. DEA-CCR모형의 분석결과는 천일정기(용당CY)가 효율적인 업체로 나타나 상대적으로 비효율적인 업체는 천일정기(용당CY)를 참조하여 효율성 개선 노력이 필요한 것으로 나타났다. 효율성 개선을 위해 KCTC(용당CY), 국보(우암CY), 코레일(부산진CY), 한진(재송CY)은 다른 업체에 비해 상대적으로 많은 컨테이너처리량 증가가 요구되고, 세방(우암CY), KCTC(우암CY), KCTC(용당CY), 협성(용당CY), 국보(우암CY)는 종사자에 대한 인적 구조조정이 필요한 것으로 나타났다. DEA-BCC모형의 분석결과 천일정기(용당CY), 동부(신영감만CY), 인터지스(감만CY), 세방(우암CY)가 효율적인 업체로 나타났고, 운영효율성 개선을 위해 KCTC(용당CY), 국보(우암CY), 코레일(부산진CY), 한진(재송CY)이 다른 업체에 비해 상대적으로 많은 컨테이너처리량 증가가 요구되고, KCTC(우암CY)와 국보(우암CY)는 상대적으로 인적 쇄신 노력이 필요한 것으로 나타났다. The purpose of this study is to use DEA modeling to make an analysis on 12 ODCY s in the hinterland of Busan North Port, so that it may propose possible ways to efficiently operate them. For analysis, this study adopted 3 input factors such as CY area, number of employees and number of cargo work equipments and also adopted 1 output factor, i.e. container throughput. According to the analysis DEA -CCR model, it was found that ChunilCYongDang CY) was the most efficient one among companies engaged in the operation of ODCY. And it was found that KCTCCYongDang CY), Kukbo(U-Am CY), KORAIL(BusanJin CY) and Hanjin OaeSong CY) would need to boost the container throughput 5 or more times higher than current throughput with a view to improving cargo handling efficiency, while Sebang(U-Am CY), KCTC(U-Am CY), KCTCCYongDang CY), HyopsungCYongDang CY) and KukboCU-Am CY) need to work on personnel restructuring targeted to current employees. Based on the analysis DEA-BCC model, it was found that Chunil(YongDang CY), DongbuCShinYoung GamMan CY), IntergisCGamMan CY) and SebangCU-Am CY) were efficient companies, but KCTCCYongDang CY), Kukbo(U-Am CY), KORAIL(BusanJin CY) and HanjinOaeSong CY) were inefficient companies. Particularly, it was found that both KCTC(U-Am CY) and Kukbo(U-Am CY) would need to try harder to carry out personnel reshuffle than other comparable companies.

화분매개곤충이 국내 주요 과수생산에 미치는 경제적 효과 분석

서동균(Dong-Kyun Seo),이상범(Sang-Beom Lee),이상용(Sang-Yong Lee),박성호(Sung-Ho Park),김동수(Dong-Soo Kim),김원태(Won-Tae Kim),박관호(Kwan-Ho Park),최영철(Young-Cheol Choi) 한국양봉학회 2011 韓國養蜂學會誌 Vol.26 No.4

Despite the importance of the honeybee pollination for many agricultural crops, there has been little economic analysis of pollination. In this paper, several methods to measure them in monetery terms have been developed, including Replacement method, CVM (contingent valuation method), etc. Replacement method is used to measure the closs fertilization (or pollination) in the fruit production except the grape and orange with self-fertilization. It is estimated about ￦755.9 billion (apple 348.6, pear 104.8, peach 28.4, others 274.0) nationally a year. These externalities are about six times of honey production and 25.7% of fruit production. Furthermore, it is about ￦18,380 thousand per farm to 40,000 honeybee farms. This study provides a basis for income support system of honey farms and public relations to the role of pollination externality in the fruit production.

운동선수의 스포츠 목표성향, 재미, 스트레스의 구조적 관계

서동균(Seo, Dong-Kyun),김응준(Kim, Eung-Joon) 한국체육과학회 2012 한국체육과학회지 Vol.21 No.5

The purpose of this study was attempted to identify the difference health behavior, self-efficacy, and loneliness with stage of exercise, sex, partner in older adults. The research problem were as following, First, is there difference of older man and woman"s health behavior, self-efficacy and loneliness as a function of stage of exercise, sex, partner in older adults? Second, is there difference of older man and woman"s self-efficacy and loneliness as a function of stage of exercise, sex, partner in older adults? The subject of this study were 117 old people(man 73 old people, woman 44 old people) more than 60 years old who inhabits in Seoul, Incheon, and Suwon area. The tools of this study was old people"s to measure Nigg, Benisovich, Rossi, and Norman(1998)"s "Multidimensional measure of Exercise Self-Efficacy", Russell, Peplau, and Cutrono(1980)"s UCLA Loneliness Scale, and Cardinal, Engels, & Zhu (1998)"s Stage of Exercise Algorithm. The data from this study were analyzed using Crosstabulation, X2, One-way ANOVA, Results of this study were as following.

탈질소 구동 메탄 분해제의 농축 재배를 위한 생물반응기 운용

서동균 ( Seo Donggyun ),( Dhiraj Kumar Chaudhary ),홍용석 ( Hong Yongseok ) 한국물환경학회 2022 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2022 No.-