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Some Applications of the Sylow Theorems
韓年鐘 群山大學校 1982 論文集 Vol.3 No.-
有限群 G가 可換 일때는 可換群의 基本 定理에 依하여 類型이 證明되여 있고, 有限群 G가 非可換群인 경우에 Sylow 定理를 利用하여 類型을 찾을 수 있는 바 本 稿에서는 G의 位數가 12인 때에 Sylow 定理에 依하여 類型을 찾고 [定理 2.1] 특히, Galois 理論에서 群의 可解性에 응용된 nilpotent 群들에 對한 性質, 즉 有限群 G의 各 極大 部分群이 正規이면 G는 nilpotent이고 可解的임[定理2.8]을 보인다.
韓年鍾 군산대학교 1980 論文集 Vol.1 No.-
This study is aimed at illustrating the basic theorem of the homomorphism and the structure of the group and the ring regarded as the fundamental conception of the modern algebra for the bigginers, and helping the students understand the theory with ease and exactness by comparing them with each other.
韓年鍾 군산대학교 1979 論文集 Vol.1 No.1
The purpose of this study is to suggest a scheme to help students of form their rational personality and build up their ability which can pass exact judgement and valid inference upon affairs. In this paper, I outlined the content of symbolic logic, and then discoursed upon the practice of logic education which fosters the rational thinking ability in students by using the symbolic logic and the set.
산수과 학력 도달도 평가자료의 개발 : Focus on the Set 수의 영역의 집합에서
강석태,한년종 群山敎育大學 1977 論文集 Vol.11 No.-
Ⅰ. I made this research by the following purposes and necessities. A. Necessity of Research 1. Elementary school teachers show some resistant responses to the curriculum based on the modernized curriculum in elementary school mathematics. 2. The resistant responses in general are as follows; (a) Insufficiencics in understanding of new contents of the curriculum. (b) Inadequacies for the physical and mental development of children. (c) Lacks of systematization in elementary mathematics resulted from the merely scattered enumerations. (d) Inadequacies of considerations for mathematic thinking. 3. It is urgent and quite natural that we should revise the above stated responses and improve the curriculum for the normal development in mathematics by finding out the good materials and the effective application of them. B. Objective of Research According to the above necesity of research, this research does not deal with the evaluation materials simply for the achievement measure, but deals with the closely related evaluation materials in 1. what to teach-a problem in the curriculum, and 2. how to teach-a problem of teaching method. Consequently this is intended to maximized the results of mathematics education by 1. developing the mathematic thinking and 2. finding out the method fit for the physical and mental growth 3. setting up the systematic relations between the earlier, middle and latter grades at the elementary school. Ⅱ. The outline of the research which was performed is as follows A. Collecting and Studying the evaluation materials already developed.(home and abroad) B. Surveying and analysing the resistant responses both in the curriculum and in actual teaching. C. Preliminary survey of children(surroundings, I. Q test etc.) D. Making the evaluation materials. 1. I limit the scope of research infield of set. 2. Framing guidance objectives of the set domain through all the grades of primary school childre. 3. Scheduling dichotomous taxonomy of educational objectives according to the above guidance objectives. 4. Making up evaluation items on the basies of the above taxonomy. 5. The examination of achievements according to the above evaluation data (application to the fouth grade and the sixth grade)
이정준,함년근,조정민,김동운,한경희 明知大學校 産業技術硏究所 2000 産業技術硏究所論文集 Vol.19 No.-
Recently, increasing of portable, importance of battery has identified. And battery is used for non-utility generation and emergency power for communication power, it has researched for power of electric vehicle. But it is disadvantage that life cycle of battery is decreased by overcharging and overdischarging. In this paper, using two phase with combined step-down chopper, we controlled charging and discharging of battery. It is dereased ripple of current and charging time with continuous current by using two phase with combined step-down chopper. Detecting the full charging voltage and cut-off voltage, it is prohibit overcharging and overdischarging with microprocessor.
TMS320F240을 이용한 PWM 인버터 유도전동기 구동 시스템의 전도노이즈 저감을 위한 스위칭 기법
朴奎炫,金利勳,元忠淵,金奎植,崔世琓,咸年根 성균관대학교 2003 학술회의지원논문목록집 Vol.2003 No.-
PWM 인버터에 의해 구동되는 유도전동기에 발생되는 고주파 커먼 모드 전압은 전도성 EMI, 전동기 접지전류, 베어링 전류 및 다른 원치 않는 결과의 주원인이 된다. 인버터 제어의 무효벡터 스위칭 상태는 나머지 유효벡터 스위칭 상태에 비교하여 큰 커먼 모드 전압을 일으킨다. 그러므로 이 논문은 커먼 모드 전압을 완화하는 스위칭기법을 다룬다. 즉 정현파 PWM기법을 기본으로 한 커먼 모드 전압 제거방법을 제안하였다. PWM 신호는 각각의 정현파 기준신호와 120˚위상차가 나는 3개의 캐리어 파형과 비교하여 발생된다. 시뮬레이션과 실험적결과는 제안된 PWM 기법에서 커먼 모드 전압이 종래의 PWM 기법보다 약 66% 더 저감됨을 보였다. High frequency common mode voltage produced by PWM inverter fed induction motor is a major cause of conducted EMI. creation motor ground currents, bearing currents and other hamful products. The zero switching states of inverter control invoke large in comparison with the non-zero switching state of inverter control. We proposed a common mode voltage reduction method based on sinusoidal PWM technique. PWM signal are generated by comparing respective sinusoidal reference signal with three triangular carrier wave displaced of 120˚. Simulation and experimental result show that common mode voltages in the propsed PWM technique are reduced by approximate 66% more than conventional PWM technique.
A New PWM Method for Conducted EMI Reduction in Inverter fed Motor Drive
Nyon-Kun Hahm,Lee-Hun Kim,Kee-Young Jeon,Eun-Gi Kim,Jung-Dong Kwon,Chung-Yeun Won,Kyung-Hee Han 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
This paper propose about new symmetry SVPWM techniques. As compared with conventional technique, It is possible reducing common-mode voltage and conducted EMI level without additional device.
Won-Nyon Kim(金元年) 한국인구학회 1990 한국인구학 Vol.13 No.2
윌리스의 生?力-所得水準 法定模型에서 子女에 대한 需要가 子女의 數와 子女養育의 質에 대하여 非同次函數 形態를 취할 때 子女需要에 미치는 潛在價格의 變化에 따른 所得效果 및 代替效果를 代數的으로 誘導하고, 이 意義를 幾何學的으로 확인해 보는 데 本 글의 意義가 있다. 代數的으로 子女需要(C)를 단순히 子女의 數(N)와 子女養育(Q)의 곱으로 C=NQ와 같이 나타낸 윌리스의 模型에서 이를 C=f(N, Q)와 같이 일반적인 函數形態를 취할 때에 消費者 理論의 基本的인 效用極大化를 통하여 子女需要를 導出하였다. 幾何學的으로는 代數的으로 導出된 子女需要에 대한 價格效果들을, 子女의 數와 子女養育의 質에 대한 相對的 潛在價格을 고려하여 子女需要의 變化, 子女數 및 子女養育의 質 사이에 관계를 圖示하였다.