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공기막의 스퀴즈효과를 고려한 마이크로미러 설계에 관한 연구
손덕수,심진욱,서화일,이우영 한국마이크로전자및패키징학회 2000 마이크로전자 및 패키징학회지 Vol.7 No.1
본 연구에서는 전극판에 깊은 홈을 가지고 전기적으로 구동 되는 마이크로미러에 대한 감쇠 특성을 고찰하였다. 유한요소법을 사용하여 마이크로미러의 공기막과 구조물 변위가 커플된 시뮬레이션이 본 연구에 적용되었다. 감쇠력은 구동 되는 미러판과 전극판 사이 공기막의 스퀴즈효과에 의해 발생한다. 전극판의 홈은 감쇠력을 감소시키며, 미러판을 낮은 전압dptj 고속 구동할 수 있도록 하여주며 정밀제어가 가능하도록 하여 준다. In this paper, the damping characteristics for electrostatically driven micro mirror which have deep grooves on their driving electrodes were investigated. A coupled simulation of gas flow and structural displacement of the micro mirror using the Finite-Element-Method is applied to this. The damping farce is caused by squeeze action of the gas film between a moving mirror plate and the electrodes. The grooves decrease the damping force and enable the moving plate to be driven at high speed and low driving voltage.
손덕수,정진훈,이재훈,정호성,박주영 한국도로학회 2013 한국도로학회논문집 Vol.15 No.1
PURPOSES : The existing method evaluating the existence of the hollows in concrete pavement does not consider the stiffness of pavement. In addition, the method uses unreasonable logic judging the hollow existence by the deflection caused by zero loading. In this study, the deflection of slab corner due to heavy weight deflectometer (HWD) was measured in concrete pavement sections where underground structures are located causing the hollows around them. METHODS : The modulus of subgrade reaction obtained by comparing the actual deflection of slab to the result of finite element analysis was calibrated into the composite modulus of subgrade reaction. The radius of relative stiffness was calculated, and the relationship between the ratio of HWD load to the radius of relative stiffness and the slab deflection was expressed as the curve of secondary degree. RESULTS : The trends of the model coefficients showing width and maximum value of the curve of secondary degree were analyzed by categorizing the pavement sections into three groups : hollows exist, additional investigation is necessary, and hollows do not exist. CONCLUSIONS : The results analyzed by the method developed in this study was compared to the results analyzed by existing method. The model developed in this study will be verified by analyzing the data obtained in other sections with different pavement structure and materials.
손덕수 안동대학교 농업개발원 2000 最高農業經營者課程 論文集 Vol.4 No.-
이상에 기술한바와 같이 토마토 재배 현황을 신속히 파악하여야 하며 토마토 월별 가격도 기록하여 단경기에 출하할 수 있도록 재배 작형을 선정해야 높은 소득을 올릴 수 있다.
손덕수,이안호,허용정,이우영 한국산학기술학회 2003 한국산학기술학회 학술대회 Vol.- No.-
CNC 가공의 절삭공정에 대하여 명료한 분석이 되어있지 않아서 다양한 절삭조건에서의 가공결과를 예측하기가 힘들기 때문에, 최적의 절삭조건 결정 및 공구선택에 대한 체계적인 기술이 정립되어 있지 않다. 따라서, 본 연구에서는 CNC 가공기인 머시닝센터 및 고속가공기를 이용한 엔드밀 절삭가공시 요구되는 일반적인 사항들을 고찰하고, 엔드밀 공정의 가공성능 향상을 위한 절삭조건결정 방식을 지적인 결정에 의하여 선택하도록 하는 사용자 친화적 지적결정 시스템을 개발하였다.
최적 종방향 타이닝 도출을 위한 주행모사 실내시험기 개발
손덕수,류성우,이재훈,배성호 한국도로학회 2022 한국도로학회논문집 Vol.24 No.2
PURPOSES : In this study, a driving simulation testing equipment was developed to derive the optimal longitudinal tinting that can reduce the lateral vibration of the vehicle. Various types of longitudinal textures and tires were evaluated through simulation testing with the equipment. Based on the results, 3×3×16mm tinning as the optimal longitudinal texture was selected among 8 textures. METHODS : Based on the literature review, the causes of lateral vibration were analyzed, and parts and types for testing equipment development were reviewed. Driving simulation with testing equipment was conducted considering various textures and tires. To verify the test results, finite element analysis was performed under the similar conditions. And field test for two textures was conducted to find the optimal longitudinal texture. RESULTS : Based on the literature review, driving simulation test, finite element analysis and field test, longitudinal texture of 3×3×16mm is show the better performance compared to 7 textures. CONCLUSIONS : 3×3×16mm as longitudinal tinning for fresh concrete is show less lateral vibration than 3×3×12mm.