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전자 종이 응용을 위한 비젼 시스템의 심도를 이용한 마이크로입자 카운팅 방법
김승택(Seungtaek Kim),김형태(Hyungtae Kim),이상호(Sangho Lee),김종석(Jongseok Kim),김용권(Yong-Kweon Kim) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
본고는 비젼 시스템에서 피사계 심도(depth of field)를 이용하여 전자 종이 같은 응용분야에 이용되는 마이크로 입자 카운팅 방법에 관한 것이다. 실험에서 평균 직경 10㎛의 마이크로 입자를 두 투명전극 사이에 스페이서(직경:125㎛)로 형성된 공간에 넣어 샘플을 제작하고, 샘플에 전계를 인가하여 입자를 상하판 사이에 위치하도록 하였다. 이 샘플 상단면에서 비젼 시스템을 통해 얻은 원본 이미지를 이미지 히스토그램과 임계치 Thresholding 함수를 이용하여 이진 이미지를 얻었다. National Instrument사 Labwindows CVI와 NI Vision Library를 이용하여 제안된 방법의 프로그램을 제작하고, 눈으로 확인할수 있는 80개의 샘플에 대해서 제작된 프로그램으로 입자 카운팅을 수행하여 카운팅에러를 확인하였다.
긴급 충돌 회피를 위한 비선형 모델 예측 제어 기반 조향 및 브레이크 통합 제어
김승택(Seungtaek Kim),한경석(Kyoungseok Han),최세범(Seibum B. Choi) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
As the demand for active safety systems for vehicles increases, various driving assistance technologies have been developed for driving safety. In particular, collision avoidance systems that use braking and active steering to prevent vehicles from, collapsing in emergencies are studied intensively. However, previous studies have a limitation in that the vehicle is controlled to follow a pre-determined collision-free path where vehicle dynamics are not considered, which stops the vehicle from, making the most of the collision avoidance ability. Thus, this study presents an integrated steer and brake controller that optimizes the control input considering the vehicle dynamics for collision avoidance situations without a pre-determined collision-free path. A nonlinear model predictive control is utilized to handle the nonlinear vehicle model and optimize the control input for collision avoidance, satisfying constraints that guarantee vehicle stability. The proposed controller was verified through experiments and showed improved results in avoiding collision compared to other methods.
Analysis of forces on a charged micron-sized particle between two parallel-plate electrodes
Seungtaek Kim(김승택),Sangho Lee(이상호),Yong-Kweon Kim(김용권) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
This paper investigates forces on a charged particle used in the e-paper application. The particles were inserted into the pixels and according to the applied voltage, particles moves up or down to the electrodes. So, to design the e-paper, the force analysis is very important for the stable operation of e-paper. For these purposes, we divided forces into 4 different forces and numerically evaluated each force. From the simulation results, we confirmed that the minimum voltage to detach the particle from the bottom electrode can be obtained for the given condition.
가속도 센서 기반 지능형 타이어를 이용한 타이어 마모 추정
김승택(Seungtaek Kim),정다솔(Dasol Jeong),최세범(Seibum Choi),이호종(Hojong Lee),김민태(Mintae Kim) 한국자동차공학회 2020 한국자동차공학회 지부 학술대회 논문집 Vol.2020 No.6
In this paper, intelligent tire based tire wear estimation method is proposed. It is important to estimate tire wear because tire wear is closely related to vehicle safety, especially braking distance. The existing method of estimating tire wear is considering mileage and tire wear rate. However, this method has the limitation that the estimation of the tire wear rate should be preceded. Therefore, in this paper, tire wear estimation method using intelligent tires is proposed. Three wear parameters predominant to wear that can be obtained from an intelligent tire acceleration sensor are proposed: x-direction acceleration peak, z-direction acceleration peak, and z-direction jerk peak. Tendency between the corresponding factor and wear was confirmed through an indoor test. The effect of tire load, speed, and pressure on the wear factor was considered and tire wear was estimated using the support vector regression technique. Wear estimation performance was verified by indoor testing.