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- 저자 : 민덕기(Min, DeokGi) (검색결과 199 건)
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위너-호프 제어기법을 이용한 BTT 유도탄의 자동조종장치 설계
민덕기,박기헌,Min, Deuk-Gi,Park, Ki-Heon 대한전자공학회 1999 전자공학회논문지SC (System and control) Vol.s36 No.6
본 논문에서는 추종 성능을 향상시키기 위해 표준모델의 2자유도 위너-호프 제어 기법을 이용하여 BTT유도탄의 자동조종장치를 설계하였다. 유도탄의 비선형 방정식으로부터 여러 동작점에 대한 선형화 모델을 구하여 선형 제어기를 설계하였으며 최종 자동조종장치는 설계된 제어기들을 이득 계획 기법을 이용하여 구성하였다. 실제 적용성을 검증하기 위하여 유도탄의 정확한 비선형 방정식과 공력 계수의 변화 등을 포함하는 6 자유도 방정식 프로그램을 이용하여 유도탄의 비행 동작에 대한 모의실험을 수행하였다. This paper presents a method for designing an autopilot of the BTT missile using 2DOF Wiener-Hopf control technique to improve tracking performance. Linear controllers are designed based on the linearized models which are obtained from the nonlinear missile dynamic equations at various operating points. The gain scheduling technique is used to implement the final autopilot. A simulation on the flight of missiles is carried out through the use of 6DOF equation program including exact nonlinear equations of the missile and the variations of aerodynamic variables in order to check applicability of the suggested method in real situation.
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Min Deak Kee(閔德基) 일본사학회 1995 일본역사연구 Vol.1 No.-
This study examines Muromachi shogunate’s requests for Korea’s mediation in its tribute relations with Ming China. Previous studies paid little attention to this aspect of foreign relations in the Muromachi period. This study focuses on the background and method of the Japanese requests and the reaction of the Korean government to them. Ten cases of Japanese requests have been confirmed; two for the reopening of the suspended tribute relations, three for Japanese concern about the possible tightening of the tribute trade caused by the disturbances by the Japanese pirates and the Japanese missions and the Ningpo rebellion, three cases for informing Ming China of Ouchi family’s seizure of tallies to be carried in the tribute trade, and two for the expansion of trade. All of them were designed to solve the problems in Japan’s tribute relations with Ming China in the medium of Korea. Japanese attitude toward Korea can be seen from them. The first two requests were conveyed orally, and the rest through state letters. Tsushima sent letters on behalf of the bakufu twice. The Korean government ignored or rejected the Japanese requests seven times. It once passed the letter to Ming China as information on Japan. It also made an effort to mediate between China and Japan once. Korea’s passive response to the Japanese requests reflected Korea’s stance not to be involved in the relations between China and Japan. The Ryukyu kingdom, on the contrary, was involved more actively in Japan’s tribute relations with China.
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사전의 유형 및 사용이 초등학생들의 독해력과 어휘력에 미치는 효과
민덕기(Min Deok Gi),윤민아(Yun Min A) 한국영어교과교육학회 2010 영어교과교육 Vol.9 No.1
This study aims to suggest better teaching methods by examining the effect of different types of dictionaries(English-English ‘EE’, English- Korean ‘EK’, and English-English-Korean ‘EEK’) on comprehension, recognition and memorization of words of elementary students in connection with two different types of texts(informative and narrative). The results are as follows. First, in comprehending the text and two types of vocabulary tests, the group with EEK dictionaries in general showed better performance than other groups. It implies that EEK dictionaries can be the most suitable type of dictionary for the EFL learners. Second, with reference to the level of English proficiency, the three groups showed a significant difference. When it comes to the advanced group, EK dictionary users showed the best performance, while in the intermediate and beginner groups, the EEK dictionary was the best. Third, in the first vocabulary test, the EEK group was the best for the informative text. With reference to the narrative text, each group showed different results. In the second vocabulary test, there was a significant difference among the three groups. EK and EEK dictionary users showed better performance than EE dictionary users. Fourth, when it comes to the long-term memory on vocabulary, there was no significant difference in the advanced group, while there was in the intermediate and beginner groups, which means that type of dictionary does not affect the performance of an advanced group. While in the intermediate and beginner groups, EEK dictionary use showed best performance. It implies that EEK dictionaries are the most effective for remembering words for a long time. Lastly, the affective area survey revealed no significant difference among the groups, except only one item. However, the opinions of the students on the effectiveness of the dictionaries in learning English were different. Most students thought that EEK dictionary was the most useful.
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