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순시 PSD기반의 p-q이론을 사용한 3상 3선 능동전력필터 시스템 구현
김정근(Jung-Kun Kim),임영철(Young-Cheol Lim),정영국(Young-Gook Jung) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
This paper describes the implementation of 3- phase 3-wire active power filter system with a instantaneous PSD for distorted and unbalanced power conditions. The positive sequence voltage of the distorted and the unbalanced power system is calculated by the instantaneous PSD, and phase transformation matrix of the instantaneous power theory is achieved w1th detected positive sequence voltage. Finally, the proposed method is experimented and tested under unbalanced nonlinear load as well as unbalanced /distorted condition m power system.
김정근(Jung-Kun Kim),임영철(Young-Cheol Lim),정영국(Young-Gook Jung),김영철(Young-Cheol Kim),전홍(Hong-Chun) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
To provide beginner with the standard current information on the a-β reference frame of nonlinear load, this paper has focused on the simulation works using MATLAB/SIMULINK in case of current source thyristor controlled rectifier The various a-β components of current/power components are induced by the p-q theory, the results are represented waveforms and trajectories on the a-β reference frame The compensation effect according to each of the compensating reference components are described
金正根(Jong Kun Kim),許程(Jung Huh) 한국인구학회 1980 한국인구학 Vol.3 No.1
Vast volumes of studies of the medical and public health aspects of fertility and family planning have been published by the various institutes of health related research and university scholars in Korea. None of them, however, have dealed with the population problems associated with biologically and mentally handicapped people. It must be emphasized that the purpose of Korea's population policy should be to improve the quality of the population rather than to decrease its rate of increase. In this spirit, the first report of this study is to identify problems related with mentally and physically less fitted population, and to attempt to offer the possible solutions to the health planners and policy-makers. Several nation-wide surveys of the handicapped people in Korea have been compared. Each survey shows a wide range of difference in the prevalence of the handicaps (see Table 13). In this study, the data on the handicaps are collected by two independent system; one by the nationwide survey and the other by the reporting system existing at the Seoul National University Demonstration Health Project. The Chandrasekar-Deming technique was used to estimate the total number of handicaps. The estimates are summarized in the tables 8, 9 and 10. Estimate of total number of handicapped people in Korea is 601,400 with the prevalence rate of 16.1 per thousand persons. Even if taking a number of conditions which may result in a biased estimate of the total number of the handicaps into consideration, the proportion of handicapped people in Korea has increased in the past two decade as the result of the rapid decline in fertility and childhood mortality, which consequently prolonged life expectancy of persons with congenital or acquired impediment. An increase in the proportion of handicapped people will eventually bring about serious problems of social welfare, medical care, and population qualities from various aspects including eugenics. To tackle the problem, there must be an increased emphasis on the prevention of handicaps from the government and private sector. Based on the amount and quality of data, and from the practical point of view, this study prepared a set of recommendations for the government to strengthen its programs of the preventive activities during the prenatal period and early childhood, early finding from routine examinations, and proper social and medical rehabilitation.