2 단 자기스위치를 사용한 고속 펄스발생기의 동작특성 ( Operation Characteristics of Fast Pulse Generator using a 2 - Stage magnetic switch )

김복권,권순걸,서기영,이현우 대한전자공학회 1996 전자공학회논문지-B Vol.33 No.10B

크리스토퍼 이셔우드의 영화적 글쓰기—「샐리 볼스」와 도시의 피상성

정지원 21세기영어영문학회 2019 영어영문학21 Vol.32 No.1

In Christopher Isherwood’s short story “Sally Bowles,” the narrator proclaims that he is a camera, recording quite passively what he sees. The narrator indeed shows Sally, the protagonist, singing at a cabaret in Berlin and pursuing pleasure in the restless city, showing her palpable outside reality as if the camera lens captures only the surface of things. What readers see is the superficial side of Sally, not her psychology or consciousness. Such cinematic writing―focusing on the outside, not the inside―helps Isherwood to picture Sally without contriving a melodramatic plot, which often upholds a patriarchal system. While the narrative of melodrama focuses on the internal or moral aspect of women, Isherwood’s cinematic writing neither delves into Sally’s mind nor frames her as one of the typical female characters in melodrama, such as a fallen or wronged woman or a virtuous woman. Instead of easy labeling, Isherwood’s camera-eye helps readers to “look” at Sally and her life in the city. The notion that Isherwood writes as the camera records is deeply related to early twentieth-century urban visual culture. The radical commercialization at the turn of the century changed the face of the city street. However, modern urban space was a site that attracted people to the surface of things, and the act of looking was one of their essential activities. The cinema was the epitome of urban surface culture, requiring people to see the surface of the screen. This essay reconsiders the concept of surface during the early twentieth century and examines the ways in which the superficiality of Isherwood’s cinematic writing is related to contemporary urban visual culture.

자기펄스 압축시스템의 에너지 변환효율 특성 ( Energy Conversion efficiency Characteristics of Magnetic Pulse Compression System )

김복권,권순걸,임근희 대한전자공학회 1995 대한전자공학회 학술대회 Vol.1995 No.1

2단 자기스위치를 사용한 고속 펄스발생기의 동작 특성

김복권,권순걸,서기영,이현우 대한전자공학회 1996 전자공학회논문지-B Vol.b33 No.10

In this study a two-stage fast pulse generaor using magnetic switches is proposed. The scheme consist of a switch, an inductor and two pairs of capacitor and saturable inductors, a linear transformer. The basic principle and the operation are described using a set of given parameters. The main issue of the magnetic pulse genration scheme is the system efficiency. This study focuses on the system efficiency improvement using magnetic switches. The voltage compression ratio, energy transfer with respect to core area are investigated. The output voltage and transferred energy as a function of input voltage are also included. Also, an analysis and experiments are performed to verify the porposed topology by implementing a 10[J] class experimental circuit. The efficiency of the transferred energy a tload side is 82%.

클램프드-모드 直列共振形 인버터에 관한 연구

김복권(Pok-Kweon Kim),박재철(Jae-Cheul Park),이현우(Hyun-Woo Lee),권순걸(Soon-Kurl Kwon),서기영(Ki-Young Suh) 대한전기학회 1992 대한전기학회 학술대회 논문집 Vol.1992 No.7

자기스위치를 이용한 고전압 펄스발생장치

권순걸,김복권 慶南大學校 附設 工業技術硏究所 1995 硏究論文集 Vol.13 No.-

자기재료의 비선형특성을 이용한 자기스위치의 volt-second정격은 스위치의 권회수, 스위치의 단면적 그리고 자기재료에 대한 △B에 의해서 결정된다. 그러나 최적 파라메터가 설계되어도 부하의 변화에 따라 volt-second정격도 변하게 되며, 이에 따라 효율 및 압축비 등에도 큰 영향을 미치게 된다. 본 논문에서는 충전부에 ZCS기법을 도입한 3단의 자기 펄스압축시스템을 구성하여, 일정 자기재료에서 부하의 변화와 충전부의 펄스폭의 변화에 따른 출력특성을 PSPICE로 시뮬레이션 하여 최적의 조건을 검토하였다. Volt-second rating of magnetic switch with non-liner property is determind by the windings of switch, cross sectional area of switch and △B about magnetic material. But although it's optimal parameter is designed. volt-second rating is changed by the change of load, And efficiency and compression ratio is influenced much through change of volt-second rating. In this paper 3-stage magnetic pulse compression system introducing ZCS technics in charging stage was design first. and output property by the change of load and pulse width of charging stage in same magnetic material was simulated with PSPICE. and then its' optimal condition was discussed.

자기스위치의 설계와 특성해석에 관한 연구

권순걸,김복권 慶南大學校 附設 工業技術硏究所 1999 硏究論文集 Vol.17 No.-

마그네틱 스위치의 스위칭은 포화 인덕터의 투자율에 따른 인덕턴스 값에 의하여 가변되며 고전압 펄스전력의 펄스에너지 압축을 위해 마그네틱 펄스 발전기가 사용된다. 그러나 마그네틱 스위치는 포화 인덕터의 비선형특성 때문에 높은 효율의 최적 설계에는 많은 어려움이 있다 본 연구에서는 고효율의 마그네틱 펄스 발전기의 최적설계를 실행하기 위하여 중급의 마그네틱 펄스 제너레이터의 동작특성을 해석하였으며. 다양한 입력전압과 입력에너지에 대하여 마그네틱 스위치 코어의 단면적이 계산되었으며, 입력특성이 해석되었다. 또한 일정한 부하조건에서의 에너지 전달 비와 전류이득의 관계가 연구되었다. Switching of magnetic switch is varied by the inductance in accordance with permeability of saturable inductor, and is used at magnetic pulse generator in use of pulse energy compression action in high voltage pulse power. But magnetic switch is difficult for optimum design with high efficiency because of nonlinear characteristics of saturable inductor. In this paper, operation characteristics of middle stage magnetic pulse generator is analyzed in order to execute optimum design of high efficiency magnetic pulse generator. And also, each cross section area of magnetic switch core is evaluated for various input voltage and input energy, and input characteristic is examined. And energy transfer ratio and current gain are investigated for each input conditions at constant load condition.

자기펄스발생기의 고전압 대용량화에 관한 연구

김복권(Bog-Kwon Kim) 산업기술교육훈련학회 2016 산업기술연구논문지 (JITR) Vol.21 No.4

Recently, high-developed domestic industry and environmental issues demand high-voltage short-pulse power supply(power, voltage, pulse width and repetition rate of 100KW, 150KV, 500ns and 500Hz, respectively) for electron beam process and pulse corona process. In such power and operation principle of a pulse-power supply with a two-stage magnetic-compression circuit and linear pulse transformer are described. Also, an analysis and experiments are performed to verify the proposed topology by implementing a 10[J] class experimental circuit. The efficiency of the transferred at the load side is 82[%]. Therefore when I tried to install 20 magnetic pulse generator modules with 15[KV], 10[J/pulse] classes in the first side of a coaxial linear pulse transformer, I identified the possibilities of development in a huge magnetic pulse generator with a high degree of efficiency generating 150[KV] to 200[J/pulse] classes output in the second side.

특성화 고등학생의 학업성취 수준별 학습전략, 학습동기, 가족건강성, 사회적 지지

김복권(Kim, Bog-guen) 한국청소년상담학회 2017 한국청소년상담학회지 Vol.2 No.4

본 연구는 특성화고등학생의 학업성취 수준별에 따라 학습전략, 학습동기, 사회적 지지, 가족건강성과 그 하위요인들이 학업성취에 미치는 영향을 알아보는데 있다. 연구대상은 소도시의 학업성취가 중간수준으로 간주되는 특성화 고등학교에 재학 중인 학생 196명을 대상으로 하였으며 2016년 2학기에 각각의 자료를 수집하여 분석하였다. 연구결과 나타난 결론은 다음과 같다. 첫째, 학습전략과 학습동기는 학업성취 상, 중, 하집단의 순서대로 차이가 있다. 가족건강성과 사회적 지지는 학업성취 상, 중집단과 하집단에서 차이가 있다. 둘째, 학업성취 수준별에 학습동기, 학습전략, 가족건강성, 사회적 지지는 학업성취에 영향력이 유의미하게 있으나 또래지지는 그 정도가 미미하다. 변인들의 하위요인에서는 인지전략(R=.48), 학습동기의 하위요인 전체(R=.52), 문제해결수행능력(R=.21), 부모지지(R=.33)로 정적인 영향이 있으나 가족원간 의사소통과 가치체계 공유는 정적인 영향력을 나타내지 않았다. 본 연구결과는 특성화고등 학생의 학업성취 수준에 따라 학업성취에 미치는 각 변인들의 영향력에 차이가 있으므로 학업성취 수준별로 변인들을 선별하여 접근해야함을 시사한다. The purpose of this study is to analyze the influence of learning strategy, learning motivation, family strength, social support and the subfactors of the variables on the academic achievement of vocational highschool students by the level of achievement. The subjects for this study were 196 students of vocational high school in the second semester of 2016 and all data collected were analyzed. The school is located in a small city and is considered to be a middle level of distinction among vocational high schools. The results of analysis were as follows. First, learning strategy and learning motivation differ in the order of the achievement of academic achievement, high-level, middle-level and low-level. Family health and social support differ in terms of academic achievement, high and middle-level, and low-level. Secondly, learning strategy, learning motivation, family health, and social support in academic achievement have significant implications for achievement, but peer support is minimal. Among the subfators of the variables, there is a positive effect on the cognitive strategy(R=.48), all of the subcomponents of the learning motivation(R=.52), ability to perform problem solving(R=.21), parental support(R=.33), but family communication, sharing the value system, and peer support showed no positive influence. The results of this study differ in the influence of each variable on the academic achievement level of the vocational high school students academic achievement level. Therefore, it is suggested that academic achievement variables should be selected and approached by the achievement level.

고등학생의 수학성취 수준별 창의성, 학업적 자기효능감, 학업적 정서조절, 학습전략이 수학학업성취도에 미치는 영향

김복권(Kim, Bogguen) 학습자중심교과교육학회 2017 학습자중심교과교육연구 Vol.17 No.3

본 연구는 고등학생의 수학성취 수준별에 따라 창의성, 학업적 자기효능감, 학업적 정서조절, 학습전략이 수학 학업성취도에 미치는 영향을 알아보는데 있다. 이를 위해 2015년 2학기에 경남에 소재한 인문계 고등학교 학생 162명을 대상으로 자료를 수집하여 SPSS ver. 22.0으로 분석하였다. 연구결과 나타난 결론은 다음과 같다. 전체 집단에서는 각각의 변인들이, 상수준 집단에서는 창의성, 학업적 자기효능감, 학습전략, 하수준 집단에서는 학습전략이 수학 학업성취도와 정적인 상관이 있다. 하위요인 중에서는 과제난이도 선호와 인지전략이 정적인 상관이 있으며 다른 요인들은 집단에 따라서 다르다. 또, 전체 집단에서는 학업적 자기효능감과 학습전략이, 상수준 집단에서는 전체 변인들이, 하수준 집단에서는 학습전략이 수학 학업성취도에 정적인 영향력을 미친다. 하위요인에서는 과제난이도 선호가 높은 정적인 영향을 미치고 있으나 다른 요인들은 집단별로 영향을 미치는 종류와 크기가 다르다. 그러므로 고등학생의 수학 학업성취도를 향상시키기 위해서는 수학성취 수준에 따라서 각 변인들과 그 하위요인들을 선별하여 적용하는 것이 바람직하다. This study is to analyze the influence of creativity, academic self-efficacy, academic emotion regulation, learning strategy on the math academic achievement by the level of mathematics achievement of high school students. The subjects for this study were 162 freshman from an academic high school located in Gyeongsangnam-do in the second semester of 2015 and all datas collected were analyzed by SPSS 22.0. The results of analysis were as follows. Each variable is positive correlation of math academic achievement of all levels. Creativity, academic self-efficacy, learning strategy have a valid correlation on math academic achievement with high-level, and learning strategy with low-level. Among subfactors of variables, task difficult preference and cognitive strategy are positive correlation, and others are different according to each subject. Academic self-efficacy, learning strategy have positive effects on math academic achievement of all subjects, and all variables with high-level, and learning strategy with low-level. Task difficult preference among subfactors of variables has positive effects on math academic achievement of all subjects, but other subfactors of variables have different positive effect according to the group. Therefore, to improve math academic achievement of high school students, it is desirable to apply each selection of variables and subcomponent of variables according to math achievement levels.