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Fuzzy Distance Estimation for a Fish Robot
Daejung Shin,Seung You Na,Jin Young Kim 한국지능시스템학회 2005 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.5 No.4
We designed and implemented fish robots for various purposes such as autonomous navigation, maneuverability control, posture balancing and improvement of quick turns in a tank of 120 × 120 × 180㎝ size. Typically, fish robots have 30-50 × 15-25 × 10-20㎝ dimensions; length, width and height, respectively. It is essential to have the ability of quick and smooth turning to avoid collision with obstacles or walls of the water pool at a close distance. Infrared distance sensors are used to detect obstacles, magneto-resistive sensors are used to read direction information, and a two-axis accelerometer is mounted to compensate output of direction sensors. Because of the swing action of its head due to the tail fin movement, the outputs of an infrared distance sensor contain a huge amount of noise around true distances. With the information from accelerometers and e-compass, much improved distance data can be obtained by fuzzy logic based estimation. Successful swimming and smooth turns without collision demonstrated the effectiveness of the distance estimation.
Fuzzy Distance Estimation for a Fish Robot
Shin, Daejung,Na, Seung-You,Kim, Jin-Young Korean Institute of Intelligent Systems 2005 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.5 No.4
We designed and implemented fish robots for various purposes such as autonomous navigation, maneuverability control, posture balancing and improvement of quick turns in a tank of 120 X 120 X 180cm size. Typically, fish robots have 30-50 X 15-25 X 10-20cm dimensions; length, width and height, respectively. It is essential to have the ability of quick and smooth turning to avoid collision with obstacles or walls of the water pool at a close distance. Infrared distance sensors are used to detect obstacles, magneto-resistive sensors are used to read direction information, and a two-axis accelerometer is mounted to compensate output of direction sensors. Because of the swing action of its head due to the tail fin movement, the outputs of an infrared distance sensor contain a huge amount of noise around true distances. With the information from accelerometers and e-compass, much improved distance data can be obtained by fuzzy logic based estimation. Successful swimming and smooth turns without collision demonstrated the effectiveness of the distance estimation.
신대중(Daejung Shin),정인화(Inhwa Jung),김철우(Chulwoo Kim) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11
The conventional output signals of low voltage differential signal(LVDS) drivers are sensitive under the process and environmental variations. A new LVDS driver is proposed to solve Vod variation under process, voltage and temperature variations and data distortion by self-calibrated Vod control scheme. The proposed self-calibrated LVDS driver is a high-speed, point-to-point connect and is implemented in a 0.25-㎛ IP5M CMOS technology. It occupies an active area of 380×320㎛² and operates at 2Gbps at a supply voltage of 2.5V.
신광성(Kwangsung Shin),서덕원(Duckwon Seo),유기형(Gihyoung Yoo),김대중(Daejung Kim),김미화(Mihwa Kim),유강수(Kangsoo Yoo),곽훈성(Kwak Hoonsung) 한국정보과학회 2004 한국정보과학회 학술발표논문집 Vol.31 No.1B
MPEG-7은 형태나 질감, 컬러 등의 속성 및 분포 등을 나타내기 위한 여러 가지 기술자(descriptor)들을 제공함으로써 검색의 효율을 높일 수 있는 방법을 포함한 표준화를 제시하고 있다. 본 논문에서는 영상의 특징을 MPEG-7의 여러 기술자중 에지 히스토그램 기술자(Edge Histogram Descriptor)를 통해 얻는다. 추출된 에지 특징을 이용하여 영상의 정해진 각 영역의 전체 후보영상과의 상대적 유사도를 비교하여 검색에 반영함으로써 검색의 효율을 향상시키는 방법을 제안한다.
A 140-Mb/s to 1.82-Gb/s Continuous-Rate Embedded Clock Receiver for Flat-Panel Displays
Inhwa Jung,Daejung Shin,Taejin Kim,Chulwoo Kim IEEE 2009 IEEE transactions on circuits and systems. a publi Vol.56 No.10
<P>A wide-range fast-locking embedded clock receiver, which can provide a continuous data rate of 140 Mb/s to 1.82 Gb/s in a 0.25-mum CMOS process, is presented. A fast lock time of 7.5 mus and a small root-mean-square jitter of 15 ps are achieved by using the proposed frequency-band selection and frequency acquisition schemes, as well as a simple linear-phase detector. The implemented embedded clock receiver occupies 2.00 mm<SUP>2</SUP> and consumes currents of 44 and 137 mA at 140 Mb/s and 1.82 Gb/s, respectively, including input/output currents.</P>