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H_{\infty} Control Synthesis for Power System Design using LMI Optimization Method
정대원,주운표,김건중,Jeong, Dae-Won,Ju, Un-Pyo,Kim, Geon-Jung The Korean Institute of Electrical Engineers 2000 전기학회논문지 D Vol.49 No.4
This paper presents the application of H$\infty$ control synthesis using LMI optimization method to power system stabilizer(PSS) design. Since power system is usually operated under circumstance of unmeasurable uncertainties and external disturbances, the improvement of small signal stability becomes one of the most important issue for securing system stability and preventing low frequency oscillation phenomena. The LMI optimized H$\infty$ PSS provides robust performance and guarantees the internal stability under these operating conditions. The global optimal H$\infty$ norm is found using LMI convex optimization method which is more systematic than standard two Riccati solution method. The design results are simulated for a case study. We verified that the LMI method shows the best performance characteristic smong standard Riccati method and conventional lead/lag method.
홍원기(Won-Ki Hong),위정원(Jung-Won Wi),정대원(Dae-Won Jeong),김민우(Min-Woo Kim),임성찬(Sungchan Im),손권중(Kwon Joong Son) 한국정보기술학회 2023 한국정보기술학회논문지 Vol.21 No.3
Rain-sensing windshield wipers, which can automatically activate automotive wipers in case of rain, operate based on an optical sensor. In line with the recent advancement of autonomous driving, the development of vision-based rain sensors has also been actively performed due to their increasing demand. This paper presents a computer vision-based real-time rain-sensing wiper system. A software algorithm to compute the presence and intensity of rainwater was developed, and a hardware prototype was constructed. It was confirmed that the area covered with rainwater on the windshield could be quantified in real-time, and the wipers could be automatically operated when the area exceeds a preset critical value.
정옥철(Ok-Chul Jung),임현정(Hyeonjeong Yim),정대원(Dae-Won Chung),김은규(Eun-Kyou Kim),김학정(Hak-Jung Kim) 한국항공우주학회 2013 韓國航空宇宙學會誌 Vol.41 No.4
본 논문에서는 다목적실용위성 3호의 초기 궤도운영 결과를 기술하였다. 다목적실용위성 3호는 2012년 5월 18일 발사된 이후 지상국 추적데이터 및 GPS 수신기 데이터를 이용한 궤도결정을 통해 위성의 초기 궤도정보를 획득하였다. 또한, 발사체 투입 궤도로부터 임무궤도로의 변경을 위한 궤도조정을 성공적으로 완료하였다. 그리고 GPS 수신기 원시데이터 및 IGS 데이터를 이용한 정밀궤도결정을 통해 궤도 정밀도를 확인하였다. 다목적 실용위성 3호는 현재 임무궤도에서 정상 운영 중에 있으며, 한국항공우주연구원 지상 관제국에서는 위성 임무 수행에 필요한 궤도 데이터를 매일 생성하여 배포하고 있다. 초기 운영 기간 동안 수행된 궤도운영 결과는 향후 다른 위성의 초기운영의 참고자료로 활용할 예정이다. This paper describes the orbital dynamics operation results for the launch and early operations phase (LEOP) of KOMPSAT-3, which was successfully launched on May 18, 2012. At the initial phase, operational orbit determination was carried out using ground tracking data and GPS navigation solution. And, both in-plane and out-of plane maneuvers were executed in order to change the orbit from the injection orbit to the mission orbit. In addition, the accuracy of precise orbit determination was indirectly evaluated by overlapping method using GPS raw data of KOMPSAT-3 and international GNSS service data from worldwide-distributed ground stations. Currently, KOMPSAT-3 is operated in pre-defined mission orbit, and its various kinds of orbit data are generated and distributed to support the normal mission operations.
장봉조,심재영,구정산,정대원,구교진,현창택,Jang, Bong-Jo,Shim, Jae-Young,Koo, Jeong-San,Jung, Dae-Won,Koo, Kyo-Jin,Hyun, Chang-Taek 한국건설관리학회 2007 건설관리 : 한국건설관리학회 학회지 Vol.8 No.1
공기지연은 건설공사에 있어서 가장 빈번하게 발생하는 클레임의 발생요인이다. 공기지연으로 인한 지체상금은 판결과정에 있어서 많은 분쟁을 불러일으키고 있다. 지체상금은 '손해배상의 예정'으로 실제 발주자가 입은 손실에 대한 보상액이 되어야 한다. 그러나 실제로는 계약 불이행에 대한 위약금의 형태로 적용되고 있다. 이러한 지체상금은 발주자의 실제 손실과 차이가 있으며, 수급자에게 과도한 부담으로 작용한다. 본 연구에서는 발주자의 실제 손실에 기반을 둔 지체상금 산정방법을 제안하고자 한다. The delay of construction is one of the most frequent and complicated elements of the claim. And the liquidated damages cause many disputes during the judgement. The liquidated damages should be a compensation for owner's substantial loss, but actually be applied as a damage for breach of contract. These damages are different from owner's loss and give constructors a excessive burden. So we need a more reasonable system than a lump application system. In this study, we make a Improvement System, that based on owner's substantial loss, and suggest the new liquidated damages calculation method.