• 한국컴퓨터정보학회논문지
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• 제14권3호
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• pp.13-26
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• 2009

본 논문에서는 현재 많은 산업 현장에서 자동 제어를 위한 시스템으로 사용하는 PLC를 대체하기 위한 시스템으로 RTOS 기반 시스템을 제안하였다. RTOS 기반 시스템은 PLC의 한계를 극복하고 시스템의 안정성곽 신뢰성을 보장하기 위한 방법으로 PC와 RTOS를 사용하는 시스템이다. 그리고 PLC 기반 시스템을 RTOS 기반 시스템으로 변환하기 위한 방법으로 시스템 모델을 통한 변환 방법을 제안하였고 변환 절차와 변환 방법을 설명하였다. 시스템 모델은 PLC 기반 시스템을 RTOS 기반 시스템으로 변환하기에 앞서 시스템을 상위 레벨에서 하위레벨로 태스크 단위로 분석한 것으로 시스템을 모듈 별로 정의하고 정의된 모듈의 동작을 태스크로 세분화하여 정의한 것이다. 모듈 별로 시스템을 제어하는 것은 PLC를 통한 제어에 비해 성능뿐만 아니라 기능적으로도 향상을 가져오고 추후 시스템의 수정이나 변화 시에도 더 유연하게 대처할 수 있다.

• 대한전기학회논문지
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• 제45권4호
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• pp.543-552
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• 1996

The goal of this paper is to developed a DSP based power analyzing and control system by 3-Dimensional (3-D) space current co-ordinates. A developed system is made up of 486-PC and DSP (Digital Signal Processor) board, Active Power Filter, Non-linear thyristor load, and Power analyzing and control program for Windows. Power is analyzed using signal processing techniques based on the correlation between voltage and current waveforms. Since power analysis algorithm is performed by DSP, power analysis is achieved in real-time even under highly dynamic nonlinear loading conditions. Combining control algorithm with power analysis algorithm is performed by DSP, power analysis is achieved in real-time even under highly dynamic nonlinear loading conditions. Combining control algorithm with power analysis algorithm, flexibility of the proposed system which has both power analysis mode and control mode, is greatly enhanced. Non-active power generated while speed of induction motor is controlled by modulating firing angle of thyristor converter, is compensated by Active Power Filter for verifying a developed system. Power analysis results, before/after compensation, are numerically obtained and evaluated. From these results, various graphic screens for time/frequency/3-D current co-ordinate system are displayed on PC. By real-time analysis of power using a developed system, power quality is evaluated, and compared with that of conventional current co-ordinate system. (author). refs., figs. tabs.

• 대한전자공학회논문지TC
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• 제40권10호
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• pp.110-118
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• 2003

본 논문에서는 NG-SDH(Next Generation - Synchronous Digital Hierarchy) 기반 전송 시스템(이하 NG-SDH 시스템)에서 광네트워크 제어방식의 전반적인 절차를 수행하는 연결제어 기능에 대한 설계과정을 기술한다. 여기서 NG-SDH는 물리적인 SDH 링크 단위(STM-1, STM-4, STM-16, STM-64, STM-256 등)로만 연결제어가 가능한 기존의 기술과는 달리 트래픽량의 증감에 따라 VC-3(약 50M) 및 VC-4(약 150M) 단위의 SDH 타임슬롯을 자동으로 연결제어를 수행할 수 있는 차세대 SDH 기술을 의미한다. 이러한 NG-SDH 기반 연결제어 기능을 통해 인그레스 NG-SDH 시스템에서 다양한 SDH 및 이더넷 라인카드들의 트래픽을 프로비젼형(PC, Permanent Connection), 반교환형(SPC, Soft Permanent Connection), 그리고 교환형(SC, Switched Connection) 연결 유형에 따라 적절한 연결 설정이 이루어진다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.1571-1576
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• 2005

DCS has many processing components and various communication elements. And its communication delay characteristic is affected diverse operating situation and context. Especially, binding signal which traversed from one control-node to another control-node undergo all sort of delay conditions. So its delay value has large deviation with the lapse of time, and the measurement of delay statistics during long time is very difficult by using general oscilloscope or other normal instruments. This thesis introduces the design and implementation of PC-based BDAS(Binding Delay Analysis System) System developed to overcomes these hardships. The system has signal-generator, IO-card, data-acquisition module, delay-calculation and analyzer module, those are implemented on industrial standard PC/Ethernet hardware and Windows/Linux platforms. This system can detect accurate whole-system-wide delay time including io, control processing and network delay, in the resolution of msec unit, and can analyze each channel's delay-historic data which is maintained by realtime database. So, this system has strong points of open system architecture, for example, user-friendly environment, low cost, high compatibility, simplicity of maintenance and high extension ability. Of all things, the measuring capability of long-time delay-statistics obtained through historic-DB make the system more valuable and useful, which function is essential to analyze accurate delay performance of DCS system. Using this system, the verification of delay performance of DCS for nuclear power plants is succeeded in KNICS(Korea Nuclear Instrumentation & Control System) projects

• 한국전자거래학회지
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• 제23권4호
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• pp.137-152
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• 2018

기존 금융정보유출 행위를 탐지하기 위해 보안솔루션에서 생성한 행위 로그를 수집하여 패턴분석으로 정보유출 이상행위를 탐지하고 차단하는 활동에서 발생되는 한계점을 극복하고, 효과적으로 대응하기 위한 방안으로 첫 번째, PC에서 정보유출 경로(외부에서 읽기, 외부로 저장하기, 외부로 전송하기 등)로 이용되는 PC내 실행 프로그램들을 실시간으로 모니터링하고 두 번째, 해당 프로그램이 실행하는 시점에 연관된 보안 통제 프로세스와 상호 연동하여 정상 통제예외 통제우회 행위인지를 파악한 다음 마지막 단계인 시나리오 기반으로 생성한 처리 절차를 통해 금융정보유출 위험을 통제할 수 있는 위험 관리 모델을 제안함으로서 정보 보호 측면의 보안성 강화 및 업무 효율성 향상의 기대효과를 창출하고자 한다.

• 한국정밀공학회지
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• 제18권7호
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• pp.65-71
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• 2001

The development process of the polishing system for the aspherical lens mold for opto-electronics industry is described. The system uses the method that polishing tool is scanned on the surface under PC-NC control for the aspherical lens mold. The two axes interpolation of the minimum translation mechanism is applied to give uniform working condition by motion analysis. An aspherical surface is divided into multiple sections and each dwell time is calculated from the polishing rate model based on the Preston equation. As result of form error compensation experiment, initial form error is decreased about 25% while an average value of surface roughness is also reduced successfully from 180nm to 19nm.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 학술대회 논문집 정보 및 제어부문
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• pp.690-692
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• 2004

Differently from an existing analog control, because the digital control includes microprocessor basically, the digital control is enable to monitor internal parameters of DC-DC converter and to control output voltage remotely by communicating with a Windows based PC and also to monitor whether exact voltage is output or not. These things are impossible in an analog control. In this paper, a simple flyback converter is taken as a control target and is controlled by a microcontroller(TMS320F2812). This converter can make variable outputs 1.8V to 5V from 30V input voltage remotely in PC. Finally the response characteristics of a step reference voltage and in a steady state are experimented to verify the feasibility and the usefulness of this digital controlled converter.

• Journal of Biosystems Engineering
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• 제29권2호
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• pp.159-166
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• 2004

In this study, we have developed a web-based management system for greenhouse teleoperation. The remote control system consisted of a database, a web-server, a controller in greenhouse, and clients. The database in the server stored user's information and greenhouse conditions was used to manage user's login and conditioning data. The management system developed by using Java applet, which was a client program for effective and easy management of greenhouse, monitored the greenhouse in real time. Master and driver boards were installed in the greenhouse control unit. Database on flowering to collect and analyze data exchanged data with the server. The master board could be managed effectively by timer routine, repeat control within setting time, and algorithm of setting points. Also, the greenhouse conditions could be controlled by manual or remote controller(PC) through a web browser in internet. Furthermore, all of the control devices of the greenhouse were managed by remote control of using PC and checked via camera installed in greenhouse. Finally, we showed the experimental results of the system which was installed in Pusan Horticultural Experiment Station.

• 한국정밀공학회지
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• 제22권11호
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• pp.82-90
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• 2005

Recently, the in-line vision inspection has become the subject of growing research area in the visual control systems and robotic intelligent fields that are required exact three-dimensional pose. The objective of this article is to study the pc based in line visual inspection with the hand-eye structure. This paper suggests three dimensional structured light measuring principle and design method of laser sensor header. The hand-eye laser sensor have been studied for a long time. However, it is very difficult to perform kinematical analysis between laser sensor and robot because the complicated mathematical process are needed for the real environments. In this problem, this paper will propose auto-calibration concept. The detail process of this methodology will be described. A new thinning algorithm and constrained hough transform method is also explained in this paper. Consequently, the developed in-line inspection module demonstrate the successful operation with hole, gap, width or V edge.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.2221-2225
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• 2005

Various types of fieldbus are used in factories in order to achieve the communication between the parts of process. But the protocol of the fieldbus doesn't have the standardized unique protocol. Thus, it is hard to exchange information each other with real time base when the different type protocols are adopted in the same network. In this paper, we implement two types of gateway for CAN and Profibus-DP: PC-based gateway and stand-alone gateway using the 80186 core based Dstni-LX network processor. The performance of proposed PC-based and stand-alone gateway is verified experimentally.