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RISS 인기검색어
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- 저자 : 최정수(Choi, Jeong Soo) (검색결과 273 건)
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LG 공진회로를 이용한 사이크로컨버터의 휴지기간 없는 극성절환 방법에 관한 연구
최정수,조규민,김영석,Choi, Jung-Soo,Cho, Kyu-Min,Kim, Young-Seok 대한전자공학회 1998 전자공학회논문지SC (System and control) Vol.s35 No.9
본 논문은 LC공진회로를 이용한 사이크로컨버터의 휴지기간 없는 극성절환 방법에 관한 것이다. 제안한 방법에 따르면 극성절환시 회로단락을 방지하기 위한 휴지기간이 요구되지 않는다. 따라서 제어지연 및 출력전류의 고조파성분이 감소하게 된다. 그리고 제안한 방법은 비순환전류형의 다른 자연전류형 사이크로컨버터에도 확장될 수 있다. 본 논문에서는 휴지기간 없는 극성절환의 스위칭 방법에 대하여 검토하였으며 제안한 방법의 유용성을 확인하기 위하여 LC공진회로를 이용한 사이크로콘버터에 적용실험을 수행하였다. This paper presents a polarity changing method without dead time of a cycloconverter with an LC resonant circuit. According to the proposed method, dead time to prevent short circuit for the polarity changing is not required. Therefore the delay of control and the harmonic components of output currents can be decreased. And the proposed method can be expanded for the other natural commutated cycloconverters of noncirculating current type. In this paper, the switching method of the proposed polarity changing without dead time is studied, and in order to confirm the validity of the proposed method the experiment is carried out with a cycloconverter with an LC resonant circuit.
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분무 열분해법으로 제조한 형광체 CaTiO3 : Pr의 특성
최정수,강윤찬,박승빈 ( Jeong Su Choi,Yun Chan Kang,Seung Bin Park ) 한국화학공학회 1998 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.36 No.5
Spray pyrolysis using FEAG(Filter Expansion Aerosol Generator) process was applied to the preparation of multicomponent oxide phosphor ; red emitting perovskite CaTiO₃:Pr. The morphology, particle size and crystalline phase were investigated by scanning electron microscopy(SEM), centrifugal particle size analyzer(CPSA) and X-Ray diffraction pattern(XRD). Optimum conditions for the preparation and post-treatment of particles for good luminescence were determined by cathodoluminescence(CL) and photoluminescence(PL). Spherical and non-agglomerated particles of micron size were prepared by the spray pyrolysis. As the solution concentration increased from 0.04 M to 0.54 M, the mean size of the particles increased from 0.9 ㎛ to 1.68 ㎛. The optimum temperature and holding time for the post-treatment of CaTiO₃: Pr were 1,200℃ and 5 hours, respectively. The PL intensity of CaTiO₃: Pr particles prepared by spray pyrolysis was twice larger than that by solid state reaction. The spray pyrolysis reduced optimum post-treatment time from 12 hours to 5 hours at 1,200℃.
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한자속독 프로그램이 초등학생의 학습기술과 주의집중력 및 학교생활 적응에 미치는 영향
최정수(Choi Jung Soo) 한국공공정책학회 2020 공공정책연구 Vol.27 No.1
The need for Chinese character education is gaining consensus again in the elementary education environment. This is because Chinese character education forms clear and clear concepts for learners poor vocabulary and contributes to improving textbook concepts and understanding and achievement (Shin Seung-ran, 2018; South Pole, 2010). In addition, the need for writing Chinese characters is also being raised, citing the high proportion of Chinese characters in the Korean vocabulary, the ease of expression in Chinese characters, and the excellent articulation of Chinese characters (Min Hyun-sik, Lee Chan-gyu, Kim Wang-gyu, Jeong Hye-seung, Noh Myeong-hee, Park Jin-ho, Park Jae-hyun, Lee Jun-seok, 2003). Based on this principle, the Chinese character reading method was developed in accordance with the principles of cerebral physiology by utilizing the speciality of Chinese characters and the principle of rapid reading. The left and right brains are activated and concentration is strengthened and reading ability is improved. However, the Chinese character reading method is a scientific teaching method developed in accordance with the physiological principles of the brain by utilizing the specificity of Chinese characters and the principle of rapid reading. If you just train according to the program, your brain develops with left-brain, right-brain activities on the basis of the right personality, and your eyes and mind are trained together, so your concentration, which is the muscle of your mind, can be strengthened to increase your academic performance. In addition, Chinese characters can be acquired easily and quickly through repeated training, long-term memory, and accurate eye movements can be combined to improve reading skills. In other words, the Chinese character reading method will improve the ability to concentrate and this change will have a positive effect on the adaptation of school life.
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