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PSCAD/EMTDC와 FEA를 이용한 케이블 배열 방법에 따른 전류 불균형률의 비교
신호전(Ho-Jeon Shin),김지호(Ji-Ho Kim),강갑석(Gab-Suk Kang),김재철(Jae-Chul Kim),이향범(Hyang-Beom Lee) 대한전기학회 2013 전기학회논문지 P Vol.62 No.2
In this study, samples from the site where there occurred unbalanced current when cable routing were analyzed, and the simulation program for electric power system analysis, PSCAD/EMTDC, was used to calculate the current unbalance on cable routing. Based on electromagnetic finite element analysis(FEA), electromagnetic parameters enabled the interlocking with COMSOL for the calculation of allowable current ampacity and magnetic filed distribution. This then led to modeling unbalanced current between common modes using the unbalanced current analysis program, thereby comparing and discussing the results from both. The analyzed model is a common mode 2 parallel circuit, which is a basic model for cable routing, and by arranging cables in various ways, the arrangement with the least current unbalance was suggested, which would, in the future, prevent earth faults and extend life for the whole cable.
신호선(Ho-Sun Shin),추준욱(Jun-Uk Chu),이승하(Seungha Lee),이연정(Yun-Jung Lee) 한국지능시스템학회 2003 한국지능시스템학회논문지 Vol.13 No.2
새로운 3차원 도립진자 시스템의 구현 및 퍼지제어에 관하여 논한다. 기존의 1차원 또는 2차원 도립진자 시스템과 달리, 3차원 도립진자 시스템은 상하 운동을 포함하는 인간의 도립진자 제어행위를 적절히 모사할 수 있는 새로운 시스템이다. 3차원 도립진자 시스템의 특성 분석과 퍼지제어기 설계를 위하여 3축 직교로봇과 도립진자를 포함하는 기구부의 동력학식을 유도한다. 로봇의 여유자유도와 제한된 작업영역을 고려하면서 도립진자의 요오(yaw) 및 피치(pitch)각을 제어하기 위한 퍼지제어기 설계 방법을 제안한다. 개발된 PC 기반의 다축제어보드를 이용한 실험 결과를 통하여 제안된 시스템의 성능을 검증한다. The fuzzy control and implementation of a new three-dimensional(3-D) inverted pendulum system are addressed. In comparison with conventional 1-D and 2-D systems, the 3-D inverted pendulum system is a proper benchmark system to simulate human's control action which includes the up and down motion to stabilize an inverted pendulum. To investigate the characteristics of the 3-D inverted pendulum system and to design of a fuzzy controller, we derive dynamic equations of the mechanism including a 3-axis cartesian robot and an inverted pendulum. We propose a design method of a fuzzy controller of the yaw and pitch angles of an inverted pendulum. In the design, the redundant degree-of-freedom(DOF) of the robot and the constrained workspace are taken into account. The performance of the proposed system is proved by experimental results using a developed PC-based Multi-Motion Control(MMC) board.
금강 수계 주요지류인 갑천과 미호천에서 잠정유해물질 오염원 확인 연구
이준배 ( Jun Bae Lee ),이재정 ( Jay Jung Lee ),조윤해 ( Yoon Hae Cho ),윤조희 ( Jo Hee Yoon ),홍선화 ( Seoun Hwa Hong ),이대희 ( Dae Hee Lee ),이수형 ( Soo Hyung Lee ),조영환 ( Young Hwan Cho ),신호상 ( Ho Sang Shin ) 한국환경농학회 2016 한국환경농학회지 Vol.35 No.1
BACKGROUND: Water quality is of concern to water utility operators, public health officials, and populations using the water. If any contaminant is released from a point of entry, it could be spread rapidly throughout the water stream. So the identification of the location of the points of entry and its release history are critical informations to establish the management strategy. METHODS AND RESULTS: Aniline, nonylphenol, pentachlorophenol and formaldehyde in 39 surface water samples were analysed using Gas chromatography-mass spectrometry (GC-MS) methods. Formaldehyde, aniline and nonylphenol were mainly detected in the near sites where industrial waste water and domestic sewage were discharged into stream. But pentachlorophenol was detected in the downstream samples where pulp manufacturing plants were operated. CONCLUSION: Results indicate that pentachlorophenol found in main stream of Guem river was mainly introduced from pulp manufacture industries. Otherwise, formaldehyde, aniline and nonylphenol were mainly contaminated from the industrial waste water and domestic sewage.
대용량 풍력에너지의 계통 연계시 전압변동을 고려한 그룹 구성에 관한 연구
신호전(Ho-Jeon Shin),이승재(Seung-Jae Lee),김진석(Jin-Seok Kim) 대한전기학회 2019 전기학회논문지 Vol.68 No.3
A number of countries around the world have the goal to enhance the ratio of renewable energy and Korea is one of them. When the large capacity renewable energy is installed, it is intensely installed in one complex, and in order to obtain the effective ingredient of the maximum power generation, it operates as close to the power factor 1. The single group operation of the large capacity wind power generator greatly changes the voltage (V) of the inverter terminal connected to the wind power generator regardless of the reactive power. Over-voltage frequently occurs with the case of generating insulation destruction of inverter facility with the voltage change. In particular, if the semiconductor of the inverter is current-type element, it may be even more vulnerable to the over-voltage. In this paper, it analyzes the facility response related to the supply and absorption of reactive power in the relationship with the electrical power system to be connected for the over-voltage arising when installing the large capacity wind power energy, and it intends to compare and analyze the effect on the power conversion equipment and scope of voltage change following the installation type under the renewable energy source’s design.
표준화사망비와 지역결핍지수의 상관관계: 지역사회 통합결핍지수 개발
신호성,이수형,추장민,Shin, Ho-Sung,Lee, Sue-Hyung,Chu, Jang-Min 대한예방의학회 2009 예방의학회지 Vol.42 No.6
Objectives : The aims of this paper were to develop the composite deprivation index (CDI) for the sub-district (Eup-Myen-Dong) levels based on the theory of social exclusion and to explore the relationship between the CDI and the standardized mortality ratio (SMR). Methods : The paper calculated the age adjusted SMR and we included five dimensions of social exclusion for CDI; unemployment, poverty, housing, labor and social network. The proxy variables of the five dimensions were the proportion of unemployed males, the percent of recipients receiving National Basic Livelihood Security Act benefits, the proportion of households under the minimum housing standard, the proportion of people with a low social class and the proportion of single-parent household. All the variables were standardized using geometric transformation and then we summed up them for a single index. The paper utilized the 2004-2006 National Death Registry data, the 2003-2006 national residents' registration data, the 2005 Population Census data and the 2005-2006 means-tested benefit recipients' data. Results : The figures were 115.6, 105.8 and 105.1 for the CDI of metropolitan areas (big cities), middle size cities and rural areas, respectively. The distributional variation of the CDI was the highest in metropolitan areas (8.9 - 353.7) and the lowest was in the rural areas (26.8 - 209.7). The extent and relative differences of deprivation increased with urbanization. Compared to the Townsend and Carstairs index, the CDI better represented the characteristics of rural deprivation. The correlation with the SMR was statistically significant and the direction of the CDI effects on the SMR was in accordance with that of the previous studies. Conclusions : The study findings indicated mortality inequalities due to the difference in the CDI. Despite the attempt to improve deprivation measures, further research is warranted for the consensus development of a deprivation index.