연구논문 : 항공기 배출량 산정 방법에 따른 공항주변 대기오염 영향분석연구

한승재 ( Seung Jae Han ),유정우 ( Jung Woo Yoo1 ),임윤진 ( Yoon Jin Lim ),이순환 ( Soon Hwan Lee3 ),이화운 ( Hwa Woon Lee ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.12

Emissions from aircraft have impacts on the air pollution of airport and the surrounding area. There are methods of emissions calculated as Tier 1, Tier2, Tier 3A and Tier 3B. Thus, this study investigated emissions from aircraft at the Gimhae International Airport using EDMS(Emissions & Dispersion Modeling System) program. Results of estimation from aviation emissions, Tier 3B considering all parts which can occur at the airport has the largest amount emissions. In order to understand the relation between aviation emissions and distribution of ozone concentration over airport area, numerical evaluation were carried out. Although the difference of surface ozone distribution between numerical assessment with and without aviation emissions was little, effects of air pollution at airport area from aviation emissions of NOx and VOCs.

대기안정도에 따른 부산 산악지역의 풍력자원평가

이순환(Soon-Hwan Lee),이화운(Hwa-Woon Lee),박순영(Soon-Young Park),김현구(Hyun-Goo Kim),강용혁(Yong-Heack Kang),김광득(Kwang-Deuk Kim) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.11

The purpose of this paper is to evaluate the wind energy resources with high spatial resolution in Sunghak Mountain in Busan metropolitan area under various atmospheric stability. Numerical model used in this research is A2C (Atmosphere to CFD), mainly applied on assessing regional scale and microscale meteorological phenformin. When the atmospheric stability become strong, wind run around mountain side. Since potential energy tends to be stronger at strong at that time, wake on lee side of mountain and variation of flow are induced naturally. On the other hand, cavity region at lee side of mountain tends to be occurred and expanded according to the decrease of atmospheric stability. Analysis on the wind energy distribution at several sites from numerical assessment confirmed quantitatively that wind resources at the top of the mountain is more suitable to establish wind energy complex than that in its slope.

대용량 태양광전원이 연계된 배전선로에 있어서 보호협조기기의 최적 운용알고리즘

권순환(Soon-hwan Kwon),이후동(Hu-dong Lee),남양현(Yang-hyun Nam),노대석(Dae-seok Rho) 한국산학기술학회 2018 한국산학기술학회논문지 Vol.19 No.5

최근, 대용량의 태양광전원이 연계된 배전계통은 기존의 단방향과 달리 양방향의 조류가 발생하고, 태양광전원의 연계위치 및 고장위치에 따라 사고전류의 크기와 방향이 변하여, 보호기기간의 협조시간차가 충분히 확보되지 않는 문제점이 발생할 수 있다. 또한, 태양광전원을 고려하지 않은 기존의 보호기기 정정치를 그대로 적용하고 있어 보호기기간의 협조시간차를 확보하기 어려운 상황이 발생하고 있다. 따라서 본 논문에서는 태양광전원이 연계된 선로에서 고려할 수 있는 3가지 Case의 보호기기 정정치 운용모드를 제시하고, 이를 바탕으로 태양광전원의 용량에 따른 최적의 보호협조 시간을 도출할 수 있는 알고리즘을 제안한다. 한편, 이를 바탕으로 보호협조 전용소프트웨어인 Off-DAS를 이용하여, 태양광전원이 연계된 배전계통을 모델링하고, 보호기기(변전소 계전기, 리클로저(Recloser), 고객계전기, 태양광전원 고객계전기)간의 협조시간차 특성을 분석한다. 실 계통을 대상으로 시뮬레이션을 수행한 결과, 본 논문에서 제시한 보호기기의 정정치 운용 모드와 정정치 산정 방식이 태양광 전원이 연계된 배전계통 보호기기간의 협조시간을 안정적으로 확보할 수 있음을 알 수 있었다. If a photovoltaic (PV) system is installed in a primary feeder interconnected with the PV system, bi-directional power flow can occur, and then, the magnitude and direction of the fault current can change, depending on the fault location and point of common coupling (PCC) of the PV system, and the time current curve (TCC) cannot be properly coordinated between protection devices. Also, it is difficult to obtain a proper time interval for protection devices because the conventional setting approach is applied, even though the PV system is installed and operating. Therefore, this paper presents three operation modes considering the operational conditions of the PV system to obtain setting values for protection devices. Based on the mode, this paper proposes an algorithm to calculate the optimal protection coordination time interval according to the introduction capacity of the PV system. In addition, this paper performs modelling of a distribution system with the PV system and protection devices by using Off-DAS S/W, and analyzes the characteristics of the time interval between the protection devices, such as substation relays, reclosers, customer relays, and PV customer relays. The simulation results confirmed that the proposed operational modes and setting-value algorithms are useful and effective for protection coordination in a distribution system for a PV system.

연구논문 : Brute-force 방법을 이용한 한반도 미세먼지 농도에 대한배출원의 기여도 산출 연구

이순환 ( Soon Hwan Lee ),이강열 ( Kang Yeol Lee ) 한국환경과학회 2015 한국환경과학회지 Vol.24 No.11

In order to clarify the contribution rate of PM concentration due to regional emission distribution, Brute force analysis were carried out using numerical estimated PM data from WRF-CMAQ. The emission from Kyeongki region including Seoul metropolitan is the largest contribution of PM concentration than that from other regions except for emission of trans-country and source itself. Contribution rate of self emission is also the largest at Kyeongki region and its rate reach on over 95 %. And the rate at Gangwon region also higher than any region due to synoptic wind pattern. Due to synoptic wind direction at high PM episode, pollutants at downwind area along from west to east and from north to south tends to mix intensively and its composition is also complicated. Although the uncertainty of initial concentration of PM, the contribution of regional PM concentration tend to depend on the meteorological condition including intensity of synoptic and mesoscale wind and PM emission pattern over upwind region.

NPC 3-레벨 인버터를 적용한 차세대 고속전철 IPMSM의 구동

권순환(Soon-Hwan Kwon),진강환(Kang-Hwan Jin),김성제(Sung-Je Kim),이태형(Tae-Houng Lee),김윤호(Yoon-Ho Kim) 한국철도학회 2012 한국철도학회논문집 Vol.15 No.2

원격 탐사 기반 해양 표면 온도의 미세 분포 차이에 따른 강설량 예측성 연구

이순환 ( Soon Hwan Lee ),유정우 ( Jung Woo Yoo ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.8

In order to understand the relation between the distribution of sea surface temperature and heavy snowfall over western coast of the Korean peninsula, several numerical assessments were carried out. Numerical model used in this study is WRF, and sea surface temperature data were FNL(National Center for Environment Prediction-Final operational global analysis), RTG(Real Time Global analysis), and OSTIA(Operational Sea Surface Temperature and Sea Ice Analysis). There were produced on the basis of remote sensing data, such as a variety of satellite and in situ observation. The analysis focused on the heavy snowfall over Honam districts for 2 days from 29 December 2010. In comparison with RTG and OSTIA SST data, sensible and latent heat fluexes estimated by numerical simulation with FNL data were higher than those with RTG and OSTIA SST data, due to higher sea surface temperature of FNL. General distribution of RTG and OSTIA SST showed similar, however, fine spatial differences appear in near western coast of the peninsula. Estimated snow fall amount with OSTIA SST was occurred far from the western coast because of higher SST over sea far from coast than that near coast. On the other hand, snowfall amount near coast is larger than that over distance sea in simulation with RTG SST. The difference of snowfall amount between numerical assessment with RTG and OSTIA is induced from the fine difference of SST spatial distributions over the Yellow sea. So, the prediction accuracy of snowfall amount is strongly associated with the SST distribution not only over near coast but also over far from the western coast of the Korean peninsula.

해양스포츠 참여자의 제약요인이 참가태도 및 참여의도에 미치는 영향

이순환(Soon Hwan Lee),문선호(Sun Ho Mun) 한국사회체육학회 2012 한국사회체육학회지 Vol.0 No.49

The purpose of this study was to identify the causal relationship between constraint factors (intrapersonal, interpersonal, and structural constraints) and attitude of participation also intention of participation in marine sports activities. A total of 172 questionnaires was used in this study and using a convenient sampling method in part of non-probability sampling method. The questionnaires consisted of four parts as factors of constraint, attitude of participation, intention of participation, and demography factors. An confirmatory factor analysis and structure equation model (SEM) were utilized by AMOS. The results of this study are followed; First, among the factors of constraint, only structural constraints were statistically negative causal relationship with attitude of participation. Even though other factors (intrapersonal and interpersonal) were not statistically significant, both factors were negatively affected on attitude of participation in marine sports activities. Second, the factor of attitude was statistically positive significant on intension of participation.

한타박스의 신증후군출혈열 예방효과 분석

권순환 ( Soon-hwan Kwon ),이수진 ( Sujin Lee ),강대연 ( Daeyoun Kang ),최지선 ( Jisun Choi ),장제윤 ( Jeyoun Jang ) 국군의무사령부 2018 대한군진의학학술지 Vol.49 No.1

Objectives; Hantavax is not yet improved due to absence of prospective randomized controlled study. The analysis of neutralizing antibody is known to the method of guessing of protectiveness of vaccine. To investigate the effectiveness of Hantavax more correctly. we were carried out immunogenicity studies before and after vaccination with Hantavax. Methods; The new solider of 17 and 20 division of Korean army are enrolled in this study. 246 blood samples collected before vaccination and 3 and 6 month after vaccine inoculation. Before and after vaccination, hantaanvirus antibodies in the serum were analyzed by ELISA, IFA, and PRNT in the collected serum. Results; The result of the vaccination status, 246 enrolled persons were able to confirm the vaccination status. In the basic vaccination, second vaccination inoculated at 1 to 3 month intervals from first shot and booster vaccination was inoculated after 7 to 11 months from second vaccination. 20% of persons are vaccinated only once in the training center. According to the results, in the group that was boosted at 7 months after basic vaccination, 37.5% from ELISA and 53.33% from IFA were detected the hantaanvirus antibodies at 6 months after the boosting. The group that was boosted at 11 months after basic vaccination was able to confirm the antibody retention by 75% in EISA and 100% in IFA at 6 months after the boosting. Conclusions; We found problems with vaccination and management of vaccine in the army. It is very important to vaccinate at the correct vaccination guideline. To find this study confirmed that the interval of hantavax vaccination was very important for the vaccine efficacy.

해체 콘크리트 폐기물 안정화 기술 및 재활용 설비 시제품 개발

이순환(Lee, Soon Hwan),윤정훈(Yoon, Jeong Hun) 대한토목학회 2022 대한토목학회 학술대회 Vol.2022 No.10

연구논문 : 국지 기상 요소에 의한 태양광 발전량 변동특성에 관한 연구

이순환 ( Soon Hwan Lee ),김해동 ( Hae Dong Kim ),조창범 ( Chang Bum Cho ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.11

In order to clarify the characteristics of Photo-Volatic(PV) power generation over the Korean peninsula with complex terrain, special meteorological observation campaign was carried out for one year from 25 May 2011. Analysis is based on the comparison between observed meteorological elements and PV values generated at rated capacity 200 kW power plants. Solar radiation observed at 15° inclined surface is 11 % larger than that observed at horizontal surface due to low elevation angel of the sun during winter season. The PV power generation tend to be more similar the variation of inclined surface irradiance than horizontal surface irradiance. Increasing air temperature often induce disturbance of the PV power generation. However, the higher the air temperature in winter season, the higher PV power generation because the PV module may be more activated at higher air temperature. PV generating efficiency tends to be conversed the value of 15%.