• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1995년도 추계학술대회 논문집
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• pp.346-349
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• 1995

In this paperwe develop a real-time simulator for direct drive cooperative robot by using OpenGL in a Windows NT based system. This simulator is composed of 2 parts, a display part and an interface part. In the display part the robot is modelled and rendered in 3D space. To do this OpenGL, a kind of graphic library, is used for rendering and animating robots and kinematics gives the information of the current robot configuration. The control and the feedback data are sent and received via the interface part. In real time simulation interfacing part needs fast data transfer rate and good nosic immunity. In experiment we have simulated 2-link direct drive cooperative robots using the trajectory tracking algorithm proposed in reference.

• 한국정밀공학회지
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• 제15권5호
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• pp.19-27
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• 1998

Color Display Tube (CDT) used in computer monitors, consists of many components. Deflection Yoke(DY) among them supplies the vertical and horizontal magnetic fields so that the spatial trajectories of electron beams are deflected according to the synchronization signals. If the magnetic fields are not correctly formed, there will be color blurring or blooming by a mis-convergence of each beam and the color image on screen may not be clear. Therefore, in the manufacture of DY. its quality is strictly examined to get the desired convergence and the occurred mis-convergence can be cured by sticking ferrite sheets on the inner part of DY. However, because it needs expert's knowledge and experience to find the proper position of the sheet, this article introduces an intelligent controller that the knowledge-base represented by a neuro-fuzzy model is used to find the optimal position of the ferrite sheet for the convergence.

• Journal of Information Display
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• 제10권1호
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• pp.37-44
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• 2009

AiPi technology incorporates an embedded clock and control scheme with a point-to-point bus topology, thereby having the smallest possible number of interface lines between a timing controller and column drivers. A point-to-point architecture boosts the data rate and reduces the number of interface lines, because impedance matching can be easily achieved. An embedded clock and control scheme is implemented by means of multi-level signalling, which results in a simple clock/data recovery circuitry. A 46" AiPi-based 10-bit FHD prototype requires only 20 interface lines, compared to 38 lines for mini-LVDS. The measured maximum data rate per data pair is more than 800 Mbps.

• 전기학회논문지
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• 제57권5호
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• pp.741-747
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• 2008

This paper proposes a new concept of IDSP(Intelligent Digital Switchgear Panel) which can solve the problem of the safety, the reliability and the convenience to correspond to the requirement of the general electric customer or electric power company under the ubiquitous-based home automation environments. By analyzing their requirement functions, a 32-bit micro processor is adopted as main controller to support the designed functions efficiently. The DSP-based single phase power management device is utilized to collect the electric power information and the ethernet convertor to communicate through internet among the IDSPs and the remote computer system. In the proposed IDSP, the several functions are implemented such as the earth leakage level display and waveform transmission, the electric fee display, the voltage management, the load management and the load control function. Finally, the prototype of the IDSP is made experimently based on the designed results, and then the effectiveness is verified by testing its basic functions.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2006년도 전력전자학술대회 논문집
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• pp.210-212
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• 2006

태양전지는 일사량에 따라 그 출력특성이 변화하기 때문에 태양전지로 부터 최대출력을 얻기 위해서는 컨버터에 의한 최대 전력점 추종제어가 필요하다. 본 연구에서는 태양광 발전 시스템의 최대전력추종을 위해 퍼지 이론을 도입한 퍼지제어기를 설계하였다. 그리고 퍼지제어기의 디지털 설계를 위해 태양광 발전시스템의 각 부분을 구성하고, 마이크로프로세서와 FPGA의 두가지 방식으로 제어기를 구현하였다. 또한 구현된 두 가지 방식의 퍼지제어기에 대해 실험을 통하여 비교분석 하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 합동 추계학술대회 논문집 정보 및 제어부문
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• pp.353-356
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• 2002

본 논문에서는 지능형 도로교통 제어기에 대하여 논한다. 제어기는 Main CPU module, Field I/O module, Display module, communication module, Mother board module로 구성되었다. 각 모듈은 하드웨어의 특성에 따라 분리되어 설계되었고, mother board를 통하여 module 간 데이터를 교환한다 Main CPU module은 입력된 교통 데이터의 처리, Field I/O module은 외부로의 데이터 입출력, Display module은 제어기와 사용자와의 인터페이스, communication module은 제어기의 debugging을 담당한다. 본 논문에서는 하드웨어를 Module화함으로써 필요한 하드웨어의 장/탈착이 용이하고, 제어기를 범용으로 사용할 수 있는 장점이 있다.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2005년도 춘계학술발표논문집
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• pp.132-135
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• 2005

본 연구에서는 반도체 제조 공정에 이용되는 가스의 흐름을 감지하고 제어하는 장치를 제안하였다 압력센서를 MFC(Mass Flow Controller)에 의해 제어되는 다음 단의 파이널밸브(Final Valve)와 챔버사이의 가스관에 부착시켜, 이 압력센서의 신호와 공압밸브의 동작 신호를 디지털 회로를 이용하여 실시간으로 제어하도록 하였다. 이로써 반도체 제조 공정 중에 발생할 수 있는 2차 소성물로 인한 가스의 흐름 제어와 관련된 시스템 고장을 LED를 통해 실시간으로 확인 가능하다. 또한 가스누출고장발생 시 반도체 제조 공정의 프로세스를 중단시켜 장비의 손상 및 안전사고를 예방하는 기능도 있다. 본 연구에서 개발된 모듈을 이용함으로써 가스밸브의 오동작에 의한 반도체/디스플레이 제조장비의 신뢰성 향상을 기할 수 있다.

• 반도체디스플레이기술학회지
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• 제19권3호
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• pp.43-48
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• 2020

The demand for stable plasma has been on the rise because of the increased delivery power amount in the chamber for improving productivity, and fast and accurate plasma impedance matching become a crucial performance measure for radio frequency (RF) power system in semiconductor manufacturing equipment. In this paper, the overall impedance matching was understood, and voltage and current values were extracted with voltage - current (VI) probe to measure plasma impedance in real-time. Actual matching data were analyzed to derive calibration coefficient for V and I measurements to understand the characteristics of VI probe, and we demonstrated the tendency of RF impedance matching according to changes in load impedance. This preliminary empirical research can contribute to fast RF matching as well as advanced equipment control for the next level of detailed investigation on embedded system based-RF matching controller.

• 반도체디스플레이기술학회지
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• 제6권1호
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• pp.31-36
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• 2007

Effect of coulomb friction and backlash on the single loop position control has been studied for the precision position control. We have showed the limit cycle on the single loop system which used a ball screw that had the backlash. Also, we have made an inner loop with a classical velocity and torque controller which was forcing the current of d axis to be zero by using a permanent-magnet synchronous motor and composed the outer loop with linear encoder for sensing a position of the loader. Also, we have used least squares fit(LSF) observer for reducing noise when we got velocity from position outputs. We have shown a good result by using the dual loop through simulation and experiment.

• 반도체디스플레이기술학회지
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• 제6권2호
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• pp.1-4
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• 2007

Programmable Logic Controller(PLC) is the most widely utilized and plays an important role in industrial control system. Among PLC languages, Sequential Function Chart(SFC) is performed in small scale industrial process. On programming by SFC, a single sequence is utilized to control the simple process. In this paper, we propose the method that describe the improved single sequence and confirm its feasibility through an actual example.