위너-호프 제어기법을 이용한 BTT 유도탄의 자동조종장치 설계

민덕기,박기헌,Min, Deuk-Gi,Park, Ki-Heon 대한전자공학회 1999 電子工學會論文誌, S 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.

이율곡의 십만양병설은 임진왜란용이 될 수 없다

민덕기(Deak-kee Min) 한일관계사학회 2012 한일관계사연구 Vol.41 No.-

외적에 대비하여 10만의 군대를 양성해야 한다는 율곡 이이의 "십만양병설"은 그동안 웬일인지 임진왜란용으로만 치부되어져 왔다. 만약 이이가 실제로 십만양병설을 제기했다면 그것은 남쪽의 왜적이 아니라 북쪽의 여진족에 대항하기 위한 것이었을 것이다. 이이가 병조판서로 있던 1583년 당시 일본은 전국 통일을 눈앞에 뒀던 오다 노부나가(織田信長)가 사망한 직후로, 도요토미 히데요시(豊臣秀吉)가 아직 주도권을 장악하지 못한 안개 정국이었던 때였다. 또한 당시 조선이 의식한 일본으로부터의 위협은 을묘왜변 정도의 수준이었지 10만의 군사를 양성해야 할 위기로 인식되지 않았었다. 반면 조선의 동북방 지역에서는 여진족 니탕개(尼湯介)의 난이 일어나 위기가 고조되어 있었다. 당시 조선 조정은 각 도에서 정예 병사를 뽑아 동북방으로 속속 파견해야 했으며, 임금이 사찰의 종까지 거둬들여 무기인 統筒을 만들라고 지시했을 정도로 니탕개의 난은 조선 조정에 큰 위기의식을 불러일으켰다. 니탕개의 난은 여진족 3만여 騎가 참여하여 六鎭지 역을 휩쓸고 다녔을 정도였다. 십만 양병설이 사실이라면 일본용이 아니 라 동북방 여진용이라고 할 수 있는 이유가 여기에 있다. 그렇다면 임진왜란이라는 거대한 쓰나미가 1580년대의 니탕개의 난으로 촉발된 동북방의 제반문제를 삼켜버렸다고 할 수 있다. 율곡이 그토록 고심하던 동북방 문제는 임진왜란의 발발로 對日用 십만양병설이 되어버린 것이다. Yul-gok"s argument of nurturing 100,000 soldiers against possible foreign enemies has been so far regarded as an argument for Imjin Waeran for some reason. If Lee Yi really had suggested such an argument, it would have been a response to Yeojin"s intrusion of northern area, not to Japan"s. In 1583, when Lee Yi was the Minister of War in Joseon, Japan was in a political crisis since Toyotomi Hideyoshi didn"t take over the reins of the government right after the death of Oda Nobunaga who put Japan just around the unification of the whole nation. In addition, the threat that Joseon felt from Japan at that time was at around the Japanese riots of the year Ulmyo and was not recognized as nurturing 100,000 soldiers. Meanwhile, in the northeastern area of Joseon, Nitangeu"s rebellion against the government broke out, which made mounting tension. The rebellion brought about huge crisis awareness to the Joseon Royal Court as much as the Court had to pick up elite soldiers at each province, and dispatch them one after another to the northeastern area; the king commanded the recruited servants from Buddhist temples to make weapons. Nitangeu"s rebellion was the extent that Yeojin"s 30,000-odd soldiers riding on horseback were mobilized to sweep through the Six Garrisons called "Yukjin", and that is the reason why the argument, if it is true, is not for against Japan, but for against Yeojin in the northeastern area. Thus, it could mean that such giant tsunami as Imjin Waeran engulfed all the issues sparked by the Nitangeu"s rebellion in the 1580s. After all, the northeastern issues that Yul-gok took pains to deal with have ended up the argument for against Japan due to the outbreak of Imjin Waeran.

최천종 살해사건으로 본 19세기 중반 通信使의 대마도 인식

민덕기(Min, Deak-Kee) 한일관계사학회 2004 한일관계사연구 Vol.21 No.-

영어일기쓰기 학습을 위한 웹 기반 프로그램 개발 방안 연구

민덕기(Min Deok-Gi) 한국초등영어교육학회 2006 초등영어교육 Vol.12 No.2

  Recently, there has been considerable improvements in computer assisted language learning based on corpora and natural language processing technology. In line with this, this paper provides an overview of relevant sites and projects believed to give us insightinto developing a web-based program for diary writing. This paper also describes Project CANDLE, including German Tutor and English Tutor, which use corpora and Natural Language Processing technologies to construct online diary contents for elementary school children in Korea. The focus of the paper is on how these technologies might be made more useful by conceptualizing an appropriate framework in order to develop contents for diary writing by children.

室町幕府의 對明朝貢 仲裁요청과 朝鮮의 대응

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.

충격하중을 받는 빙해선박 구조물의 파단에 관한 연구

민덕기(Dug ki Min),조상래(Sang Rai Cho) 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.11

상온 및 저온에서의 낙하 충돌 파단실험과 수치해석 결과로부터 저온에서 충격하중에 대한 빙해선박 구조물의 충격에너지 흡수능력이 떨어진다는 사실을 확인하였다. 따라서 빙해선박의 사고한계상태(Accidental Limit State)설계 관점에서 파단 예측 시 빙해선박용 강재의 저온 파단특성이 고려된 파단모델을 반드시 사용해야 한다. 그렇지 않고 기존의 연구들과 같이 상온으로 가정한 파단예측의 경우 빙해선박 및 해양구조물의 파단특성을 과대평가하는 오류를 범할 수 있다. 본 논문에서는 정수압 응력과 등가 응력의 비를 전단 파단의 조건으로 하는 Johnson-Cook 파단 모델을 낙하 충돌 파단실험 수치해석에 적용하여 Johnson-Cook 파단 모델에서 요구하는 재료상수를 제시하였다. 제시된 재료상수를 적용한 Johnson-Cook 파단모델이 낙하 충돌 파단실험 결과 나타난 구조물의 크랙을 거의 정확히 재현하였다. 따라서 제시된 DH36 강의 파단 정의를 위한 응력 삼축비와 파단 변형률 관계는 적절한 것으로 판명되었다. 이로써 향후에는 DH36 강으로 구성된 구조물의 파단 예측에 제시된 Johnson-Cook 재료상수와 이를 근거로 작성된 파단 변형률-응력 삼축비 곡선이 유용하게 활용될 것으로 기대한다.

임진왜란에 납치된 조선인과 정보의 교류

민덕기(Min. Deok-Kee) 한국사학회 2004 史學硏究 Vol.- No.74

The Korean captives who were abducted to Japan during Hideyoshi's aggressive war tended to socialize with each other within their social statuses that they had possessed in Korea. For example, those in the wanior class socialized mainly with other warriors. When they attempted to escape back to Korea, however, these Korean captives collaborated as members of the same nation, beyond differences in their social statuses. These Korean captives actively exchanged information with each other: most of such information was about their repatriation, the timing of Korean delegates' arrival in Japan, and the Korean government's treatment of repatriated Korean captives.<br/> These Korean captives visited Korean delegates to Japan, and asked them about life of and letters from their families in Korea. Based on information they received through the delegates, the captiwes decided whether they should repatriate to Korea or rather stay in Japan. Entrusted letters for these captives from their families in Korea who craved the envoy to bring their captivated relatives back to their home country, the delegates also made efforts to find and repatriate certain captives,<br/> Tsushima domain attempted to maneuver information through Korean captives they repatriated to Korea. For instance, on the one hand, when the Korean government did not responded to Japan's peace proposal, the officers in Tsushima expedited the negotiations on the peace treaty by threatening Korea with Japan's possible next military aggression against Korea. On the other hand, after burying the hatchet, they continuously returned Korean captives to their home country in order to expand trades between Tsushima and Korea, or to urge the Korean government to send an envoy to Japan.<br/> It was Tsushima domain and Korean delegates to Japan that made the mail communication between the Korean captives and their families possible. While communication through the official channels was rare, exchange of letters between the captives and their families through private channels was often practiced, The agents of such communication were people in Tsushima.<br/> <br/>

암석을 대상으로 시행하는 Schmidt Hammer 타격법의 새로운 제안 (I)

민덕기(Tuk-Ki Min),문종규(Jong-Kyu Moon),이상일(Sang-Il Lee) 한국암반공학회 2009 터널과지하공간 Vol.19 No.4

암석 물성을 간접적으로 추정하기 위한 방법으로 슈미트 해머 타격법이 보편화되어 있다. 그러나 보고된 대부분의 방법들은 단일 타격법으로 오차를 많이 내포하고 있으며 연속 타격법의 경험식도 자료 처리방법에 불합리한 점들이 많아 범용하기 어려운 실정이다. 본 연구에서는 기존의 ASTM, ISRM, BSI, Poole와 Farmer 및 Hucka의 방법들을 검토하고, 국내에서 출토된 150개의 화성암, 변성암 및 퇴적암을 대상으로 시험을 시행하여 이들 방법들의 불합리한 점들을 수정, 보완하여 최적의 시험방법과 새로운 자료 처리방법을 제시하였다. Schmidt hammer test as an indirect method has so far been widely applied for determining the physical properties of intact rock, and many researchers have developed procedures for its use on rock cores, blocks and in field. Though many methods have developed upto date for indirect using, the almost were single blow which has many errors. The purpose of this study was to evaluate the established as for ASTM, ISRM, BSI, Poole & Farmer and Hucka method and to suggest a new optimum test method and statistical analysis on rocks. The finding has indicated that succeeding blow has served as an optimal to predict physical properties of rocks. To conduct the experiment, researchers have examined 150 rock blocks, which include igneous, metamorphic and sedimentary rocks in Korea nation wide.

도쿠가와 이에야스의 1606년 조선에 보낸 ‘국서’에 대한 위조설 검토

민덕기(Min, Deak-kee) 한일관계사학회 2015 한일관계사연구 Vol.52 No.-

디지털 이미지 처리를 이용한 입도 분포 분석

민덕기(Min Tuk Ki),이완진(Lee Wan Jin),김치영(Kim Chi Young) 대한토목학회 2004 대한토목학회 학술대회 Vol.2004 No.10