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2개의 MOSFET을 이용한 차량용 스마트 윈도우 제어 회로 개발
이길호(Kilho Lee),이종현(Jonghyun Lee),정현우(Hyunwoo Jung) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
This paper is about circuit that control smart windows for vehicles using two MOSFETs. Conventional control circuit for smart window has disadvantages in power efficiency and power density. In particular, these shortcomings can be fatal in the field of lightweight and miniaturized power generation of future vehicles. Therefore, this paper proposes a new control circuit that can compensate for the shortcomings of conventional smart window control circuit. The proposed circuit can effectively control the transmittance of smart windows using variable PWM duty ratio and two MOSFETs.
이효은(Hyoeun Lee),김강희(Kanghee Kim),이길호(Kilho Lee) 한국정보과학회 2021 정보과학회논문지 Vol.48 No.5
본 논문은 자율주행차를 위한 컴퓨팅 시스템의 센싱부터 제어까지의 종단간 응답시간을 확률적으로 분석하는 기법을 기술한다. 종단간 응답시간은 차량 응답성을 평가하는 지표로서, 차량 안전을 보장하는 다양한 지표들을 유도하는데 활용될 수 있다. 예를 들어, 장애물 센싱부터 차량 정지를 위한 제어까지의 종단간 응답 시간이 주어지면, 차량 안전을 위해서 요구되는 차량 속도의 상한을 정의할 수 있다. 또한, 제안하는 분석은 차량 응답성을 개선하기 위해서 컴퓨팅 자원을 얼마나 투입해야 하는지를 판단하기 위해서도 활용될 수 있다. 본 논문은 ERF(Earliest Release First) 스케줄링을 사용하고 태스크마다 CPU를 고정적으로 지정하여 실행한다는 가정 하에서 안전한 분석 방법을 제안하고, 오픈소스 자율주행 스택 오토웨어(Autoware)의 응답성 분석 결과를 제시한다. This paper presents a method of probabilistically analyzing the end-to-end response time from sensing to actuation in autonomous vehicle computing systems. The end-to-end response time is used to evaluate vehicle responsiveness and to derive various indicators of vehicle safety. For example, given the end-to-end response time from sensing an obstacle to stopping the vehicle, an upper limit of the vehicle’s speed may be defined. In addition, the proposed analysis may be used to determine how many computing resources should be invested in improving vehicle responsiveness. This paper proposes a safe analytical method under the assumption that ERF (Earliest Release First) scheduling is used and that each task is pinned to a certain CPU, and presents the results of the responsiveness of an open source autonomous driving stack called Autoware.
조영래(Youngrae Jo),이길호(Kilho Lee),조성호(Sungho Jo),신인식(Insik Shin) 제어로봇시스템학회 2012 제어·로봇·시스템학회 논문지 Vol.18 No.5
This paper presents an approach to implement the behaviors of multi-robots responding to user’s input characters. The robots are appropriately displaced to express any input characters. Using our method, any user can easily and friendly control multi-robots. The responses of the robots to the user"s input are intuitive. We utilize the centroidal Voronoi algorithm and the continuous-time Lloyd algorithm, which have popularly been used for the optimal sensing coverage problems. Collision protection is considered to be applied for real robots. LED sensors are used to identify positions of multi-robots. Our approach is evaluated through experiments with five mobile robots. When a user draw alphabets, the robots are deployed correspondingly. By checking position errors, the feasibility of our method is validated.