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허영환(Young-Hwan Heo),문상필(Sang-Pil Mun),김영문(Young-Mun Kim),박한석(Han-Seok Park) 대한전기학회 2015 전기학회논문지 P Vol.64 No.4
This paper has proposed a new boost rectifier. Adequate input current was obtained by keeping the duty ratio constant without complicated conventional control methods and the improvement of the waveform was increased. With a decrease of distortion up to 12.9[%], the scope of restriction on harmonics was set to 13.0[%](3<SUP>td</SUP> harmonics), 1.1[%](5<SUP>td</SUP> harmonics) and 0.6[%](7<SUP>td</SUP> harmonics), respectively. Because complicated methods of control are avoided, the circuit configuration is simple and practical. In particular, the said effect turned out to be highly efficient in the low boosting ratio range(boosting ratio(α)=1.25). The feasibility of these facts has been proven both theoretically and experimentally.
일본(日本) 학교도서실(學校圖書室)의 배치유형(配置類型)과 공간구성(空間構成)에 관(關)한 연구(硏究)
허영환(Heo, Young-Hwan),이상호(Lee, Sang-Ho) 한국교육시설학회 2005 敎育施設 Vol.12 No.2
The school library plays an important role to improve the student's mental activity and cultivate the formation of character and emotion. Especially in the information society, the students must collect, select and utilize the necessary information themselves. The school library has to collect, put in order and keep the book, audiovisual material and necessary information beyond it about the entire education and to offer the students and teachers them for the general school education. The school library has to be a center of school education and drive forwards the spontaneous and subjective learning activity as well as progress the education process. The school library must be the place to preserve the student's subjective study ability, that is, consolidate the materials as the study center and be composed of proper study materials for the solving-problem and research. Also to be perfect in the role of the information center, the school library has to be consolidated in accordance with development of various information softwares and ways including the newspaper, magazine, video, CD, laser disk and computer. It is required for the information of school library to be corresponded actively to the multi-media society.
초등학교(初等學校) 도서실(圖書室)의 공간구성(空間構成)에 대(對)한 연구(硏究)
허영환(Heo, Young-Hwan),김승근(Kim, Seung-Geun) 한국교육시설학회 2003 敎育施設 Vol.10 No.1
The library of elementary schools, which plays a role in the basic education to grow a responsible social member in an information society and to develop ability for collection, selection, summary, and utilization of various information, could be considered as new educational center. It should be changed to the establishment of informational education for preparing the information society in 21st century through the functional extension of the conventional library as reading and bookstand. Furthermore, it is necessary of trials that converts to the support system for interchange between establishment and student, for preparing educational system of teaching or studying, and for opening establishment to local communities in the future.