• 제어로봇시스템학회:학술대회논문집
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• 1992.10b
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• pp.463-467
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• 1992

This paper describes the automatic generation of sequence control programs for DCS(Distributed Control System), PLC(Programable Logic Controller) and so on. Since there is no same manufacturing process, it is difficult to standardize sequence programs. We propose the automatic sequence control program generator which is CAD software using knowledge engineering technique.

• 제어로봇시스템학회:학술대회논문집
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• 2005.06a
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• pp.1309-1312
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• 2005

A multi-chemical supply system is developed and applied to a wet station, which uses the multi-chemical process in one bath. To control the concentration of two chemicals, control logic of a supply pump is programmed using the programable logic controller (PLC). By using the multi-chemical supply system, wet station with single bath is applied to cleaning process using multi chemicals such as buffed oxide etchant (BOE) and standard clean 1 (SC-1). The concentration of each chemical is measured in the bath to verify the multi-chemical supply system. The control range in the each chemical concentration is measured to 1.33weight% in NH4OH and 0.23weight% in H2O2. The multi-chemical supply system can be movable and usable as an independent module of fixed wet station. By simply midifying the PLC, a multi-chemical supply system can be developed for a wet station.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1992.10a
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• pp.307-311
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• 1992

종래의 DNC(Direct Numerical Control)에서 가공 Cell의 효율을 높이기 위한 분산 제어 DNC(Distributed Numerical Control)시스템 운용을 위해서는, 운용에 필요한 소프트웨어 외에 공작기계 및 주변기계에 대한 실시간 감시/제어 기능을 가져야 한다. 이를 위해 당 연구실에서는 경제성 및 확장성을 고려 범용 PLC (Programable Logic Controller)와 각 공작기계 및 주변기기를 연결하고, PC(Personal Computer)와 다자간 및 고속 통신이 가능한 전용 통신회선을 이용한 경제성 있는 실시간 가공 Cell 감시/제어시스템 RT-COMOS(Real Time Machine Cell Control and Monitoring System)를 개발했다. 본 논문에서는 이에 대한 연구결과를 소개한다.

• 제어로봇시스템학회:학술대회논문집
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• 1991.10a
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• pp.758-761
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• 1991

Using one chip microcontroller 87Cl96 (On chip EPROM type) and EPLD (Erasable & Programable Logic Device), an implantable control system to drive pendulum type electromechanical total artificial heart was developed. This control system consists of 4 parts, main management system, motor driver with power regulator, state monitoring system and communication part. The main system has the functions for speed detection, PI(proportional and integration) control, PWM generation, communication and analog data processor. Two kinds of power system were used and separated by 8 photo coupler arrays to improve the system stability. The performances of each compartments were compared with our previous z80 microprocessor based control system and good correspondences was shown. Logic power consumption was reduced to a one third of our previous controller. Using mock circulation tests, the overall performances of control system are evaluated.

• Journal of Astronomy and Space Sciences
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• v.14 no.2
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• pp.259-268
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• 1997

We present the development process of a prototype CCD imaging system which is being built at Korea Astronomy Observatory(KAO) for astronomical applications. The CCD imaging system requires very low noise and high stability characteristics and is widely used for astronomical purposes from infrared to ultraviolet wavelength regions. However its system design, particularly for the controller design technique, as heart of the system, is not secured in Korea so far. The prototype electronics developed in this study consists of a signal chip controller which was implemented in an EPLD(Erasable Programable Logic Device) and an analog driver, a video processor with a LN2 cooling cryostat. A PC system was employed to control the whole system and to store the image data considering compatibility of the system. We have successfully obtained the first image in the laboratory with the prototype of this imaging system, and an image of the M15 at Sobaeksan Astronomy Observatory.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.10a
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• pp.113-114
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• 2013

일반적인 소규모 휘발성유기화합물(VOCs:Volatile Organic Compounds) 배출시설인 주유소, 세탁소, 도장시설 등의 환경에서 대기로 배출되는 휘발유 유증기, 세탁용제(솔벤트유) 증기 등을 포집하여 포집된 유증기를 다시 액화처리 과정을 통하여 휘발유, 솔벤트로 재생산하는 기존의 PLC(Programable Logic Control) 방식의 처리과정을 ICT(Information Communication Technology)을 도입하여 보다 효율적이고 안정적인 스마트한 VOCs 액화장치 관리시스템을 개발하고자 한다. 현재 기존의 주유소 휘발유증기액화장치는 타이머와 릴레이 등을 조합하여 냉동 공조 장치로 동작하도록 하고 있다. 이는 단순한 전기제어로 동작하여 관리자가 항시 주의를 요하며 전력소비가 심해 생산량에 비해 손해가 발생하게 되며, 관리자가 원격지에서 생산량과 현 상황을 확인할 방법이 존재하지 않아 항상 관리자가 직접 수기로 기록하게 되어 많은 불편사항이 발생하였다. 본 논문에서 이러한 기존의 시스템을 대부분 유지하고 자동화와 원격 모니터링 시스템을 갖추고 블루투스(bluetooth) 모듈을 이용하여 원격에서 시스템을 관리할 수 있도록 개발하고자 한다.

• Journal of Advanced Marine Engineering and Technology
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• v.39 no.4
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• pp.412-417
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• 2015

The IMO MEPC has been increasingly strengthening the emission standard for marine environment protection. In particular, nitrogen oxide (NOx) emissions of all ocean-going ships built from 2016 will be required to comply with the Tier-III regulation. In this study, a vanadia based SCR (Selective Catalytic Reduction) system developed for ship application was installed on a diesel engine for power generation of the training ship T/S SAENURI in Mokpo National Maritime University. For the present study, the exhaust pipeline of the generator diesel engine was modified to fit the urea SCR system. This study investigated the NOx reduction performance according to the two kind of injection method of urea solution (40%): Auto mode through the PLC (Programable Logic Control) and Manual mode. We were able to find the ammonia slip conditions when in manual mode method. So, the optimal urea injection quantity can be controlled at each engine load (25, 35, 50%) condition. It was achieved 80% reduction on nitrogen oxide. Furthermore, we found that the NOx reduction performance was better with the load up-down (while down to 25% from 50%) than the load down-up (while up to 50% from 25%) test.