• 수산해양기술연구
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• 제30권3호
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• pp.135-141
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• 1994

In order to investigate remotely the behavior and distribution of fishes, the telesounder system which was composed of two parts with a buoy station at sea and a base station on land was manufactured trial. The buoy station at sea consists of fishfinder, transmission interface and transceiver. On the other hand, the base station on land consist of transceiver, receiving interface, trigger/signal separator and color display monitor. The system simulation for the performance of telesounder was carried out by use of echo simulator which could input echo signal into fishfinder. The received power (dBm) of transceiver at 29.4MHz decreased almost in proportion to distance between transmitter and receiver, and the electric field intensity was 12.12mV/m at 100 meters distance from transmitter. The image of color display monitor at the base station on land was very well coincident with the records of fishfinder from the buoy station located at sea. Therefore, it is concluded that the telesounder system is very useful in the analysis of the information on the behavior and the distribution of fishes detected from sea.

• 융합신호처리학회논문지
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• 제13권1호
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• pp.1-5
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• 2012

본 연구에서는 청취자가 3차원 공간에서 자유로이 움직일 수 있는 음장 재생 시스템을 개발하였다. 시스템은 방음실($4.7m(W){\times}2.8m(D){\times}3.0m(H)$)에 설치하였으며 개인용 컴퓨터, 음의 제시장치 그리고 3차원 초음파 센서로 구성하였다. 본 시스템에서는 실내 전체를 감지하는 3차원 초음파 센서로부터 청취자의 위치 정보 및 자세각 정보를 얻어, 컴퓨터에서 나오는 음신호에 머리전달함수(HRTFs)를 삽입하여 음의 제시 장치로부터 출력하도록 설정하였다. 실험에 사용한 머리전달함수는 청취자의 머리 정변에서 1.5m 떨어진 지점에서 각각 측정하였다. 그리고 시스템의 성능을 평가하기 위해 가상 음원의 위치를 랜덤으로 변화시키고, 청취자에게는 자유로운 이동을 허락한 상태에서 음원의 위치를 찾는 실험을 수행하였다. 그 결과, 3차원 공간에 있어서 제시된 음원의 위치에서 청취자가 추정한 위치까지의 거리 오차는 약 30cm 이내로 나타났다.

• 방송공학회논문지
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• 제14권4호
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• pp.419-427
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• 2009

본 논문에서는 시점의 움직임에 대해 최적의 자연스러운 스테레오 영상을 관찰자에게 제공할 수 있는 시점추적시스템을 제안하였다. 관찰자의 위치를 추적하기 위한 시점추적시스템은 관찰자와 배경의 상대적인 거리를 측정하여 배경으로부터 관찰자를 분리할 수 있다. 시점추적을 위한 키 신호를 얻는 방법으로 TOF(Time-Of-Flight) 이론으로 만들어진 깊이 카메라(depth camera)를 사용하였다. 또한 관찰자의 위치가 제한되는 고정형 패럴랙스배리어의 단점을 보완하는 방법으로 이동형 패럴랙스배리어를 제안하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 학술대회 논문집 정보 및 제어부문
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• pp.331-333
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• 2004

In this study, we implement the multiple frequency bioelectrical impedance analysis system for body composition analysis. Overall system consists of : 1) conductivity electrodes to contact with hands and foots, 2) multiple frequency alternating current signal generator for generating 5, 50, 250kHz frequency and 800uA contained alternating current signal, 3) voltage signal detector, 4) phase signal detector, 5) key-pad to input individual information, 6) micro controller for data processing, 7) LCD for processed data to display, 8) system power, We explain the architecture of the system and required theory to implement the system. Finally, experimental results are illustrated to show the performance of the system.

• 한국콘텐츠학회논문지
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• 제18권1호
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• pp.1-9
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• 2018

본 논문에서는 눈을 깜빡(eye-blink)일 때 발생하는 안전도(EOG, electro-oculogram) 신호를 이용하여 손을 사용하지 않는 가상현실 HMD(head mounted display)용 키보드 시스템을 제안하였다. 본 시스템은 디스플레이 소자, 자이로스코프센서, 중력센서, 뇌전도(EEG, electro-encephalogram) 센서 등으로 구성되며, 시스템의 제어 및 그래픽 처리 등을 위한 Unity3D 엔진으로 가상현실 HMD용 키보드 시스템을 구현하였다. 구현된 키보드의 방식은 한글의 경우 천지인 키보드 방식을 사용하였으며 영어, 숫자, 기호의 경우 $3{\times}4$ 방식을 사용하여 공간상의 문제를 해결하였다. 구현된 시스템을 통해 손을 사용하지 않고 목의 움직임과 안전도만으로 가상현실 HMD의 키보드 입력이 가능함을 확인하였다.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 1998년도 The Third Asian Fuzzy Systems Symposium
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• pp.423-425
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• 1998

An optical system which can autonomously form and display an impression of a picture made up by many figures has been developed. This system consists of optical fuzzy-neurons which calculate the correlation between the input picture and the reference image by incoherent optics. The calculated signal is applied to an amplifier whereby the output signal increases, then decreases according to increase of the input signal . These outputs are synthesized, and are used for changing the position where the system gaze on a part of the input picture by light beam. In this system, the light intensity used for gazing changes chaotically, The attractor drawn from the change of light intensity corresponds to the impression of the picture. This paper shows the results that are calculated by the numerical simulation. The system has been simulated to express the impression for a picture formed by 4figures.

• 대한의용생체공학회:의공학회지
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• 제12권4호
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• pp.303-308
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• 1991

Computer assisted cardiac mapping system has made it possible to display local activation times of the heart using a simultaneous multi-point data aquisition system, and opened an era in electrophyslology guided cardiac arrhythmia surgery especially in ventricular tachycardia. In this study, we have developed a 64 channel computerized cardiacmapping system us:ng a micro-computer for basic reasearch of electrophysiology and electrical propagation in cardiac arrhythmias. The significant tasks of this study were the simultaneous acquisition of large amount of data from 64 sites, accurate and rapid analysis, and the effective display of the analyzed data. To solve these problems, we made a 64 channel signal pre-processing board in order to amplify and fitter the raw signals. And we developed the soflu'are Yor cardiac isochronous mapping whictl is presented immediately ama computer-generated graphics. This system is expected 4o enable us to study pathophyslology of cardiac arrhythmia and to improve the results of diagnosis and surgical treatments for cardiac arrhythmia.

• ETRI Journal
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• 제41권1호
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• pp.32-41
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• 2019

We propose a speckle reduction technique in electronic holographic display systems, where digital micro-mirror array devices are used as spatial light modulators. By adopting a programmable filtration in a general 4-f optic configuration, it is shown that the signal spectrum components in the frequency domain of a viewing-window-based holographic display system can be selectively filtered. Compared to the widely utilized single-sideband filtration techniques in electronic holographic display systems, our proposed programmable filtration can be utilized to effectively reduce the speckles in the reconstruction of point-cloud-based computer-generated holograms. Experimental results are presented to verify our proposed concept.

• 반도체디스플레이기술학회지
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• 제19권4호
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• pp.105-111
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• 2020

In most multiple input/output systems, one input affects two or more different outputs. Therefore, there are many inconveniences in using the actual system. In order to solve this problem, a controller that makes an input signal and an output correspond 1:1 is called a decoupling controller. In this paper, I try to implement a relatively simple decoupling controller using a cross-compensator, that is, a compensator that takes an uncorresponding output as an input value. And this cross-compensator has a gain scheduler structure in order to increase the performance. In addition, this system is designed with a distributed control structure using CAN communication, so that it can be manufactured and operated in an easier way when implementing an actual experimental system. The proposed structure is applied to the modified new Arago's disk system and tested, and through this, the effectiveness is confirmed and reported.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2001년도 가을 학술발표논문집 Vol.28 No.2 (2)
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• pp.412-414
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• 2001

In this paper, we describe an real-time facial feature tracker. We only used a general USB PC Camera without a frame grabber. The system has achieved a rate of 8+ frames/second without any low-level library support. It tracks pupils, nostrils and corners of the lip. The signal from USB Camera is YUV 4:2:0 vertical Format. we converted the signal into RGB color model to display the image and We interpolated V channel of the signal to be used for extracting a facial region. and we analysis 2D blob features in the Y channel, the luminance of the image with geometric restriction to locate each facial feature within the detected facial region. Our method is so simple and intuitive that we can make the system work in real-time.