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A New Design of Wave Energy Generator Using Hydrostatic Transmission
안경관(Ahn, Kyoungkwan),딩광졍(Dinh, Quangtruong),윤종일(Yoon, Jongil) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
An innovative design of a floating-buoy wave energy converter (WEC) using hydrostatic transmission (HST), named HSTWEC, is presented in this paper. The system is designed to convert ocean wave fluctuation into electricity by using the HST circuit and an electric generator. Based on the floating-buoy concept, the wave forces the sub-buoy to move up and down. Consequently, the electric power can be obtained from the generator in both the moving directions of the sub-buoy through the HST circuit as shown in Fig. 1. In order to investigate the HSTWEC operations, a mathematical model of the system is indispensible. In addition, the method to control the HSTWEC, including: pump displacement control, tension adjustment control and ballast weight control, is also discussed in this paper. Finally, the design concept as well as simulation results indicated that this HSTWEC design is an effective solution and possible to fabricate for wave energy generation.
에너지 절감을 위한 전공 레귤레이터의 압력제어에 관한 연구
김형석(HyoungSeog Kim),안경관(KyoungKwan Ahn),이병룡(ByungRyong Lee),윤소남(SoNam Yun) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Nowadays, elector-pneumatic regulator is widely used to a variety of practical pressure control applications. Fuzzy rule based PWM algorithm is newly proposed to save energy of electro-pneumatic regulator in this paper. A novel fuzzy rule based pulse width modulation(FRPWM) valve pulsing algorithm allows the electro-pneumatic regulator to become energy saving system. A comparison between the system response of conventional PWM algorithm and that of the proposed algorithm shows that the control performance is almost the same, but energy saving is greatly improved by adopting this new PWM algorithm. The effectiveness of the proposed FRPWM algorithm is demonstrated through experiments with various reference trajectories.
김영훈,리두이콴,지영준,안경관,황창호,Kim, Younghoon,Le, DuyKhoa,Chee, Youngjoon,Ahn, Kyoungkwan,Hwang, Changho 대한의용생체공학회 2013 의공학회지 Vol.34 No.3
This study is about the development of the wrist rehabilitation system for the patient who has limited capability of movement after stroke. Electromyography triggered training system (ETTS) can play the role between complete passive training and patient activating training system. Surface EMG was measured on pronator teres muscle and biceps brachii muscle for wrist pronation and supination. Our system detects whether the subject makes muscular effort for pronation or supination or nothing in every 50 ms. When the effort level exceeds the preset percentage of maximal voluntary contraction, the motor rotates according to the direction of the intention of the subject. EMG triggers the motor rotation for the wrist rehabilitation training until the preset angle. To evaluate its performance, the maximum voluntary contraction level was measured for 4 subjects at first. With the audio-visual instruction to rotate the wrist (pronation or supination) the subjects made effort to follow the instruction. After calculating root mean square (RMS) for 50 ms, the controller determines whether there was muscular effort to rotate while holding the motor. When there was an effort to rotate, the controller rotates the motor 0.8 degree. By comparing the RMS values from two channels of EMG, the controller determines the rotational direction. The onset delay is $0.76{\pm}0.24$ s and offset delay is $0.65{\pm}0.22$ s for pronation. For supination the onset delay is $1.24{\pm}0.41$ s and offset delay is $0.77{\pm}0.22$ s. The system responded fast enough to be used for rehabilitation training. The controller perceived the direction of rotation 100% correctly for the pronation and 97.5% correctly for supination. ETTS was developed and the fundamental functions were validated for normal subjects. The clinical validation should be done with patients for real world application. With ETTS, the subjects can train voluntarily over the limitation of the range of motion which increases the effectiveness of the rehabilitation training.
조우근(Wookeun Jo),안경관(Kyoungkwan Ahn),윤종일(Jongil Yoon),김동우(Dongwoo Kim),임구(Goo Lim),박재현(Jaehyun Park) 한국자동차공학회 2008 한국자동차공학회 지부 학술대회 논문집 Vol.2008 No.11
This paper is a study on the path-tracking of electronic wheelchair for welfare vehicle and on autonomous driving that vehicles seek for their own position following car. Normal welfare vehicles need an assistant, while those in this paper are designed for the disabled themselves to drive them. So a notion of autonomous driving of electronic wheel chairs and of moving robots is needed. We suggest fuzzy controller in order to control some of all the path planning of electronic wheelchair which is applied to welfare vehicles designed for self driving. And we com pare a capability of PID controller with that of fuzzy controller.
증강 현실을 이용한 웨어러블 컴퓨터 기반의 비디오 통신 시스템
김종배 ( Jongbae Kim ),안경관 ( Kyoungkwan Ahn ) 한국정보처리학회 2004 한국정보처리학회 학술대회논문집 Vol.11 No.2
일반적으로 비디오 통신 시스템은 두 전화 통신자의 영상을 각 사용자의 통신 장비에 부착된 스크린에 출력함으로써 음성과 더불어 통신을 이룰 수 있게 하는 시스템이다. 하지만, 현재까지 비디오 통신 시스템은 정적인 상황하에 통신이 이루어짐에 의해 통신 사용자의 움직임에 많은 제약을 가져온다. 그러나, 사용자가 주시하는 실세계의 배경에 상대방 사용자의 영상을 부가하여 보여주는 증강현실(Augmented Reality) 기술은 현실감 증대에 많은 도움을 줄 수 있으며, 최근 많은 관심이 되고 있는데, 이 기술은 비디오 통신 시스템에 이용함으로써 기존의 시스템의 제약을 해결 할 수 있다. 따라서, 본 논문은 비디오 통신 시스템에 정적인 환경하에 영상을 전송 받아 통신하는 기존의 시스템을 개선하여 사용자가 움직이면서 주시하는 실세계를 배경으로 상대 통신자의 영상을 중첩하여 보여주는 증강현실 기술을 이용한 비디오 통신 시스템을 제안한다. 이처럼 통신 사용자의 활동성을 보장하면서 비디오 통신을 이루기 위해 웨어러블 컴퓨터를 이용하여 비디오 통신 시스템의 구현하였다. 또한, 제안한 시스템은 비디오 통신뿐만 아니라 다양한 시스템에서 활용될 수 있음을 알 수 있다.
가변 유압 펌프/모터를 이용한 플라이 휠 하이브리드 차량에 관한 연구
조용래(Yongrae Cho),오범승(Bumseung Oh),안경관(Kyoungkwan Ahn),양순용(Soonyong Yang),이병룡(ByungRyong Lee) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
Nowadays, it becomes a serious problem to exhaustion of a fossil fuel and air pollution by exhaust gases from<br/> road vehicles for environment preservation. To solve this problem, the developments of a hybrid vehicle have been<br/> processed for the purpose of reducing pollution and energy-savings. By the way, flywheel hybrid vehicle using<br/> variable pump/motor was proposed as one feasible hybrid system in place of hybrid vehicle system by the<br/> conventional storage battery. The proposed flywheel hybrid vehicle is composed of an accumulator or a flywheel as<br/> the energy generation and storage source and three variable hydraulic pump/motor as the energy transfer device.<br/> Flywheel has the characteristic of high energy density and easy energy absorption and consumption.<br/> In this paper, the effectiveness of the energy-saving of the proposed flywheel hybrid vehicle is verified by<br/> simulation using Matlab/Simulink. First of all, analytical modeling and simulations for the flywheel hybrid vehicle<br/> are presented and the energy-savings are investigated in simulation. Simulations were performed based on the<br/> experimental efficiency data of a variable pump/motor. The result of the simulation shows that it is possible to<br/> improve fuel economy in city driving patterns.