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2극 50㎐ 대용량 공기 냉각 동기 발전기 설계 적용 기술
이완주(Wan-Joo Lee),임철(Chul Im),김충목(Choong-Mok Kim),황계하(Kye-Ha Hwang),서명덕(Myong-Duk Seo),이성한(Sung-Han Lee) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
수소 및 수냉각 대형 발전기의 설계, 제작 경험을 통해 보유한 설계 기술을 바탕으로 120㎿ 및 150㎿ 공기냉각 발전기 2개 모델을 개발 완료하였다. 모델 개발 과정에서 고정자, 회전자 등 주요 구성품에 대한 신뢰성 및 건전성을 확보하기 위하여 다양한 엔지니어링 및 해석을 수행하였다.
구조물 능동진동제어를 위한 압전 작동기 구동 파워앰프와 제어 알고리즘 구현 시스템의 개발
이완주(Lee, Wan-Joo),곽문규(Kwak, Moon-K.) 한국소음진동공학회 2012 한국소음진동공학회 논문집 Vol.22 No.2
This paper is concerned with the development of power amplifier and controller for piezoelectric actuator and sensor used in smart structures. Even though a high-voltage power amplifier is provided in the form of an operational amplifier, a very high DC voltage is still necessary as a power supply. In this study, we propose a low-cost design for the power amplifier including the DC power supply. We also need a controller on which a control algorithm will be mounted. In general, a digital signal processing chip is popularly used because of high speed. However, only commercial product is available for smart structure applications. In this paper, a controller consisting of a DSP and electronic circuits suitable for piezoelectric sensor and actuator pair is proposed. To validate the proposed controller with power amplifier, experiment on smart structure was carried out. The experimental results show that the proposed control system can be effectively used for smart structure applications with low cost.
국방연구개발 사업성과에 영향을 미치는 사업관리 요인에 관한 실증연구
편완주(Wan Joo Pyun),김성근(Sung Kun Kim),이주헌(John Hearn Lee) 한국데이타베이스학회 2009 Journal of information technology applications & m Vol.16 No.4
Defense R&D is an essential investment for the national security. Recently our nation has also begun to initiate a number of defense R&D projects. As a lot of fund and resources are allocated to these projects, we need to identify which projects to initiate and then how to manage these projects well. Though there have been a number of studies on R&D projects in commercial sector, there are only a few studies in defense R&D sector. Moreover, these existing defense R&D studies mainly deal with the former issues, which are occurring at the stage of project planing. We are more concerned with project management issues, such as how to manage projects that had already been evaluated to undertake at the planning stage. Specifically our study aims to identify project management factors leading to the success of defense R&D projects. Results of the empirical analysis indicate that management support, user-driven requirements management, and project planning capability are key elements for project performance.
적응적 루프필터의 지터 변화율을 이용한 ATSC DTV 시스템의 심볼 타이밍 동기 성능 개선
남완주(Nam Wan-Ju),이주형(Lee Joo-Hyung),김재명(Kim Jae-Moung),김승원(Kim Seung-Won) 한국방송·미디어공학회 2005 한국방송공학회 학술발표대회 논문집 Vol.2005 No.-
ATSC 지상파 DTV 시스템에서 심볼 타이밍 동기 성능 개선을 위한 알고리즘을 제안한다. 일반적으로 심볼 타이밍 동기를 위해 사용되는 가드너 방법은 다중 경로 페이딩 환경에서 성능이 좋지만 지터에 의해 성능 열화가 발생한다. 지터량는 루프 필터 대역폭이 작을수록 작아지지만, 수렴속도는 느려지게 된다. 수렴속도는 빠르면서 수렴 후 지터량를 감소시키기 위해 일정시간마다 루프필터의 출력 값을 평균하고 이 평균값을 이용하여 옵셋량을 추정한 후 추정된 옵셋의 변화율에 따라 루프 필터의 대역폭을 줄여 지터의 크기를 줄이는 알고리즘을 제안한다.
이완주,Lee, Wan-Joo 한국정보기술전략혁신학회 2007 情報學硏究 Vol.10 No.4
Object tracking in a real time environment is one of challenging subjects in computer vision area during past couple of years. This paper proposes a method of object detection and tracking using adaptive background estimation in real time environment. To obtain a stable and adaptive background, we combine 3-frame differential method and running average single gaussian background model. Using this background model, we can successfully detect moving objects while minimizing false moving objects caused by noise. In the tracking phase, we propose a matching criteria where the weight of position and inner brightness distribution can be controlled by the size of objects. Also, we adopt a Kalman Filter to overcome the occlusion of tracked objects. By experiments, we can successfully detect and track objects in real time environment.