擬似不規則 信號를 利用한 無定位性系統 同定

鄭亨煥,崔京三 弘益大學校 1973 弘大論叢 Vol.5 No.-

In this paper, a new method of astatic system identification using newly defined χa(t), a kind of preud(-)orandom signal, was studied by theoretical analysis, analogue-contest, and numercial analysis by digital computer. Experiments were performed on the second order astatic system and the results were in good agreement with the theoretical values. It is therefore, expected that the new method of astatic system identification proposed in the paper can be conducive to identify operating astatic processes in nuclear reactor and other pertiment equipment.

離散値形 線形制御系統의 最適狀態推定 方法에 관한 一硏究

崔京三 弘益大學校 1975 弘大論叢 Vol.7 No.-

In this paper, a comparative study on the state estimation is made by means of the filtering problem in the linear discrete control systems with state and measurement noises, from the standpoint of least square fit, maximum likelihood, and Bayesian approach. The optimal state estimator for linear dynamic control systems is derived in the sense that the variance of the errors is minimized. The effectiveness of the optimal estimator is proved through the numerical example by digital computer.

개선된 MGCP 프로토콜을 이용한 인터넷 음성 통화 구현에 관한 연구

崔京三 弘益大學校 科學技術硏究所 2002 科學技術硏究論文集 Vol.13 No.-

In this paper, A modified MGCP call setup protocol for the voice conference in Internet is studied. This modified MGCP embodies the call setup model of a conference call, and very similar to the standard MGCP. So, this modified protocol may conference with devices where standard MGCP is installed. The only difference from the standard MGCP is that it has a GROUP concept for the conference. And the conference call setup is constructed on a GROUP base. IP multicast and RTP ( Real-time Transfer Protocol ) are used for the realization of conference call control. IP multicast is a solution of network traffic problem caused by a conference, because multicasting is a one to many communication, and RTP is a solution of reducing network delay during the voice data transmission.

프랙탈 이론을 이용한 영상압축 및 확대 알고리즘

李鍾洙,崔京三 弘益大學校 科學基術硏究所 1998 科學技術硏究論文集 Vol.9 No.2

Digital image zooming is the problem of finding out the most similar information to an original one from a shrinked information available. This paper presents a digital image compression and zooming algorithm using the Fractal theory that has the property of ˝Self-similarity˝. Self-similarity is the property that a certain part of an image is similar to some other part in that image. To reconstruct a part of the image, we must change the position and the grey-level information of the other similar part to affine-transform coefficients and store them. An approximate image can be reconstructed by adapting this transform to an arbitrary image and a zoomed image can be aquired by adapting this transform to a larger image. This paper suggests a modified affine transform that does not diverse when the contrast adjustment is larger than, 1 and this algorithm guarantees a better reconstruction of image. Simulation results show that the proposed algorithm gives better restoration results comparing to the convention-al LI(Linear Interpolation) and NNI(Nearest Neighbor Interpolation) methods.

이동로봇에 장착된 Stereo Vision을 이용한 이동인식에 관한 연구

崔京三,李基聖 弘益大學校 科學技術硏究所 2000 科學技術硏究論文集 Vol.11 No.-

Among the several sensors used in mobile robots, the computer vision is most useful in modeling for the cognition in 3-D real world. Because the computer vision requires much complex computation, it is hard to use for controlling a system in real time mode. In this paper, the movement of robot for cognition is divided into 8 categories. The proposed algorithm for cognition of position of objects and movement of robot by the real time image processing is studied. Also, the vertical line extraction method using parallel coordinates is proposed. And the algorithm for cognizing movements classifies the movement of objects into 4 directions; set right-left and forward-backward. The aim of this algorithm is to show the real time processing and low cost implementation for low level capacity systems. The Lab experiments were performed to show that the algorithm yields faster and more simple than ready-made algorithm in normal lights and other DT system like GPS.

홈 네트워킹 시스템 구현에 관한 연구

崔京三 弘益大學校 科學技術硏究所 2004 科學技術硏究論文集 Vol.15 No.-

In this paper, we have designed a home networking system using an embedded LINUX board. The system based on the World-Wide-Web is composed of three parts - a Server, a Client and a Simulator. The home networking server is built in an embedded board based on the LINUX kernel. The web server and Home Networking Server Service Demon programs are installed in the board using the Java-Language. Clients may connect to the server using any desktop computers, any PDAs or any other machines which include any web-browsers. For this purpose, the client service programs are composed of Java-Applets. The clients who connect to the server for the control of the applications, download the class-file automatically and execute the client-program in the web-browser. So, the clients don't need any other programs to control the applications from a remote place. The size of server board is very small (86.3x74mm), which makes it very useful not only for the home networking system but also in many other fields, e.g., embedded robot control system, etc. In many fields, using an embedded board instead of a desktop computer will make the network environment very simple, since it occupies only a small space to install the system and doesn't need any maintenances.

A Hybrid Control Algorithm for the Direct Drive Robotic Manipulators

李鍾洙,崔京三 弘益大學校 1989 弘大論叢 Vol.21 No.2

본 논문에서는 직접 구동 팔의 효율적인 경로 제어를 위해 이산 제어 성분과 연속 제어 성분의 두 가지가 혼합된, 새로운 하이브리드 제어 방식을 제안한다. 이산 제어 성분은 로보트 팔의 근사적 추정 모델을 이용하여, 로보트의 규정경로를 따라 계산하는 규정 토오크로서, 로보트의 동력학 정보를 계산하기 위해 필요한 많은 계산 시간을 고려하여, 큰 표본 시간을 갖도록 한다. 이 제어 입력은 로보트 관절들간에 상호 작용하는 강한 결합 토오크를 근사적으로 보상한다. 연속 제어 성분은 가변 구조 제어 이론을 변형한 제어 입력으로서, 모델링 오차나 작업부하의 변화에 따른 외란 등에 강하게 대처하여 경로 추적의 정학성을 높일 수 있도록 한다. 최근의 제어기 개발 추세에 따라 제안한 알고리즘을 디지탈 제어로서 실현할 경우 '연속 제어 성분은 이산 제어 성분에 비하여 매우 작은 계산량 만을 필요로 하므로, 두 가지의 서로 다른 표본 시간을 갖는 이산 제어 형태로서 구현할 수 있음을 보였다. 제어 시스템의 안정성을 증명하였으며, 제안한 알고리즘의 효용성을 보이기 위하여 작업 부하 오차, 모델링 오차 및 계산에 의한 제어 입력의 시간 지연을 고려하여 3자유도의 직접 구동 로보트 팔에 대하여 시뮬레이션 하였다.

소형 컴퓨터시스템에 의한 학사업무 전산화를 위한 소프트웨어 개발

박장춘,최경삼 弘益大學校 1978 弘大論叢 Vol.10 No.-

Das Ziel der vorliegenden Arbeit liegt in der Entwicklung der "Soft-ware", die mit der elektronischen Datenverarbeitung der neulich sehr umfangreich gewordenen akademischen Verwaltungsarbeit, z.B. der vorbereitende Immatrikulationsprozess, das Nebenfachsystem usw. in der "Pilot-School" bezogen ist. Zur elektronichen Datenverarbeitung der akademischen Verwaltungsarbeit haben wir zun?chst die ganzen im Zusammenhang stehenden Aufgaben ausf?hrlich analysiert und daraus das System konstruiert. Wir haben das Programm entwickelt innerhalb des minimalen Gebrauchs des Zentralund Externspeichers, um die akademischen Verwaltungs arbeiten zu beschaffen. Als Programmiersprache haben wir die in der Mini-computer am verallgemeinerte FORTRAN verwendet. Der Erflog der elektronischen Datenverbeitung fur die akademischen Verwaltungsarbeiten zeigt wie folgender massen: -Da vor dem neuen Semester mit Hilfe der Computer der Namensruf fur die tudenten vorbereitet und dadurch er gleichzeiting mit dem Vorlesuongsanfang benutzt wird, ist es sehr hilfreich f?r den effektiven Studiengang. -Durch die viermalige Vorbereitung des Belegs der Studiumsnote f?r das Register, den Studentenbetreur, den Ableitungsleiter und die Studenten war es sehr erfolgreich f?r den Studiengang. Durch die Hilfe der erweiterten Externspeichers und des on-line computer systems werden die Verwaltungder der belegten Note und die Ausgabe der im allgemein verlangten Besch einigungen wahrscheinlich demn?chst verwirklicht werden.

擬似不規則 2維信号를 利用한 無定位性系統 同定

崔京三 대한전기학회 1973 대한전기학회 워크샵 Vol.1973 No.8

IBM-PC를 이용한 로봇 제어용 사용자 인터페이스 개발

이종수,최경삼 弘益大學校 科學技術硏究所 1993 科學技術硏究論文集 Vol.3 No.-

In this paper, we developed the basic robot commands on the level of VAL robot language and the integrated environment software of robot management system to give users an easy way of programming the robot. The developed software is designed to support Korean language and to be run by the pop-up menus for programming commands and inputs. Geometrical and dynamical features can be viewed on a computer monitor by graphics and the taught works can be interfaced with a computer and controllers.