• 전기의세계
• /
• v.24 no.5
• /
• pp.38-41
• /
• 1975

기술 및 소개한 내용을 아래와 같이 요약할 수 있다. 1)전력계통의 계산기제어를 위한 하아드웨어시스템은 온라인리얼시스템의 구비 조건인 고속성, 신뢰성, 경제성을 기저요건으로 하여 동시에 다중프로그래밍, 다중처리가 가능한 범용전자계산기를 모체로 하고 다수의 위성계산기에 의하여 국지적 제어도 가능한 계층제어 시스템의 구성을 이루고 있는 것이 현 추세이다. 2)전력계통의 계산기제어는 전력계통의 안정제어가 그 주내용이나, 전력공급의 질을 일정수준으로 유지하면서 가장 경제적으로 전력을 안정된 상태로 공급하는 것이 더욱 바람직하다. 그러나 현단계에서는 긴급상태 및 회복상태에서는 전력의 안정공급에만 주안점을 두고 있는 실정이다. 3)전력계통의 안정제어의 기능은 상태의 감시, 해석 및 안전최적화의 3기능이며 안정최적화 기능중의 제어지령도 리얼타임으로 자동화하는 것이 궁극적 목표이나 현단계로서는 CRT 표시장치등의 맨머신 인터훼이스를 통하여 제어지령의 결정과정에서 조작원이 개입하는 것이 상례이다. 즉, 전력계통의 안정제어는 아직까지는 프로세스제어의 단계에 이르지 못하고 오퍼레이션제어의 특징을 다분히 지니고 있다. 4)조작원의 판단이나 개입을 줄이는 첩경은 하아드웨어의 개선보다는 전력계통 리얼타임 제어에 충분할 정도로 처리시간에 단축되는 전력계통제어용 각종 응용프로그램의 개발에 있으며 그 시기는 아직 먼 것으로 전망된다.

• Journal of the Korean Society for Railway
• /
• v.19 no.4
• /
• pp.526-538
• /
• 2016

The government of South Korea has made great efforts in the area of railway safety management by means of a railway safety law and an integrated railway safety plan established in 2004 after the Daegu subway fire accident. However, after certain railway incidents, a reactive railway safety management system has been implemented that has led to fatal accidents caused by the collision, derailment, and fire every year. Hence, this study is intended to propose a framework that integrates data from distributed detection devices into a real-time railway safety monitoring and control system for proactive safety management. Furthermore, we will provide a future development direction for safety performance monitoring indicators to determine whether the railway safety monitoring and control system works effectively. The proposed framework is expected to be a cornerstone for the real-time railway safety monitoring and control system to be implemented in the future.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.24 no.4
• /
• pp.50-56
• /
• 2010

Supervisory Control and Data Acquisition Systems (SCADAs) is real-time monitor and control systems. SCADA systems are used to monitor or control chemical and transportation processes, in municipal water supply systems, electric power generation, transmission and distribution, gas and oil pipelines, and other distributed processes. SCADA refers to a large-scale distributed system. The supervisory control system is placed on top of a real time control system to control external processes. Emerging security technologies and security devices are decreasing the vulnerability of the power system against cyber threats. Dealing with these threats and analyzing vulnerabilities is an important task for equipment such as RTU, IED and FEP. To reduce such risks, we develop such a SCADA testbed. This paper presents the development of a testbed designed to assess the vulnerabilities SCADA networks(including serial communication).

• The KIPS Transactions:PartA
• /
• v.16A no.6
• /
• pp.481-488
• /
• 2009

GIS is used to isolate large power electrical equipment using SF6 gas. While GIS has simple structure, it has few break down, relatively high reliability. But it is hard to check up faults for reason of pressure. Faults of GIS should have a ripple effect on community and be hard to recovery. Consequently, GIS imports a preventive diagnostic system to find internal faults in advance. It is most important that reliability on the GIS preventive diagnostic system, because it estimates abnormality of system by analysis result of collected data. But, exist system which used central data management is low efficiency, and hard to guarantee timeliness and accuracy of data. To guarantee timeliness and accuracy, the GIS preventive diagnostic system needs accordingly to use a real-time middleware. So, in this paper, to improve reliability of the GIS preventive diagnostic system, we use a middleware based on TMO for guaranteeing timeliness of real-time distributed computing. And we propose an improved GIS preventive diagnostic system applying data acquisition, monitoring and control methods based on the TMO model. The presented system uses the Communication Control Unit(CCU) for distributed data handling which is supported by TMO. CCU can improve performance of the GIS preventive diagnostic system by guaranteeing timeliness of data handling process and increasing reliability of data through the TMO middleware. And, it has designed to take full charge of overload on a data acquisition task had been processed in an exist server. So, it could reduce overload of the server and apply distribution environment from now. Therefore, the proposed system can improve performance and reliability of the GIS preventive diagnostic system and contribute to stable operation of GIS.

• Proceedings of the Korean Information Science Society Conference
• /
• 2005.11a
• /
• pp.664-666
• /
• 2005

본 논문에서는 적외선을 기반으로 하는 가정용 정보가전기기들을 실내 또는 실외에서 원격으로 제어 및 감시할 수 있는 가정용 정보가전기기 제어 시스템을 구현하였다. 무선 인터넷 접속이 가능한 PDA에 본 논문에서 구현한 클라이언트 응용 프로세서를 동작시키고 가정용 홈 서버에는 정보가전기기를 제어하기 위한 서버 응용 프로세서 및 필요한 제어용 하드웨어 장치들을 부착하였다. 클라이언트 및 서버의 구현구조, 응용 프로세스 간 제어 메시지 등 구현의 세부 내용을 기술하였다. 본 구현의 세부 내용은 차세대 인터넷 프로토콜(IPv6)을 지원할 수 있도록 쉽게 수정 보완될 수 있으므로 IPv6용 가정용 정보가전기기 제어시스템의 개발에 쉽게 적용될 수 있다.

• Journal of Practical Agriculture & Fisheries Research
• /
• v.18 no.1
• /
• pp.101-112
• /
• 2016

Monitoring and control of the greenhouse environment play a decisive role in greenhouse crop production processes. The network system for greenhouse control was developed by using recent technologies of networking and wireless communications. In this paper, a remote monitoring and control system for greenhouse using a smartphone and a computer with internet has been developed. The system provides real-time remote greenhouse integrated management service which collects greenhouse environment information and controls greenhouse facilities based on sensors and equipments network. Graphical user interface for an integrated management system was designed with bases on the HMI and the experimental results showed that a sensor data and device status were collected by integrated management in real-time. Because the sensor data and device status can be displayed on a web page, transmitted using the server program to remote computer and mobile smartphone at the same time. The monitored-data can be downloaded, analyzed and saved from server program in real-time via mobile phone or internet at a remote place. Performance test results of the greenhouse control system has confirmed that all work successfully in accordance with the operating conditions. And data collections and display conditions, event actions, crops and equipments monitoring showed reliable results.

• Proceedings of the KIEE Conference
• /
• 2006.07a
• /
• pp.256-257
• /
• 2006

대규모 전력산업의 지속적인 성장을 위해서는 전력계통 시스템의 고신뢰도를 필수적으로 요구하며 따라서 계통운영 전반에 디지털과 자동화 기술 기반의 고도의 기술 필요성이 날로 증대되고 있다. 그 결과 변전소 자동화 구축을 위한 세계 표준 규격인 IEC 61850이 제정되었으며 2005년 전체적인 세부 사항이 확립되어 발표되었다. 이러한 세계적인 추세에 발맞추어 한국전력공사는 변전소 내에 설치되는 상위 장치인 변전소 운전용 컴퓨터, 하위 장치인 센서들(변류기, 변성기 등)과 제어기(차단기 등), 그리고 상위 장치와 하위 장치 사이에서 감시, 진단, 보호, 제어, 계측, 보안 방재 등을 담당하는 장치(IED Intelligent Electronic Device)들을 기존의 다심 구리 케이블 대신 고속 LAN 케이블로 연결하여 데이터 전송 및 제어명령 전송에 사용하는 통신에 IEC 61850 단일 프로토콜을 사용함으로서 변전소 건설과 운전, 유지보수의 효율성과 신뢰성을 향상시킴과 동시에 변전소 운영에 필요한 정보의 가용성을 극대화시킬 수 있는 기반을 구축하기 위한 기술을 개발 중에 있다.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.16 no.10
• /
• pp.992-1000
• /
• 1991

At present, using different method, in the view of point of that factory to the rising of the productivity, they try to rise productivity by factory automation. First, it is the automation of each unit process. In out country, in the case of a few developed factory. they are realized by line automation. The majority factories are established by automation device of unit process. But, as the established devices, it must be connect between unit processes or mutual assistance and offical automation in order to raise up productivity highly. In this paper, process inspection control system is installed by each unit process automation and connect main computer with them. So, we try to rise high productivity using stochastic process and supervision function.

• Proceedings of the KIEE Conference
• /
• 2009.07a
• /
• pp.353_354
• /
• 2009

변전소내 주 전력설비에는 변압기, 170kV 및 25.8kV GIS(Gas Insulated Switchgear), 보호제어장치, 집중감시제어반, SCADA(Supervisory Control and Data Acquisition) 등으로 구성되어 있다. 이들 기기들을 제어하고 조작하기 위한 조작회로 보조장치에는 접자접촉기인 보조계전기가 사용되어진다. 1개 배전반내에 보조계전기는 보통 20개 이상 설치되어 있고 변전소내 타 고가 전력기기에 비해 저가이고 수량이 상대적으로 매우 많다. 본 논문에서는 25.8kV GIS내에 널리 사용되는 일반 제품인 보조계전기의 특성을 고찰하므로서 변전소 운전환경에 적합한 운영방안을 제시하고자 한다.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.39C no.4
• /
• pp.362-369
• /
• 2014

A railway SCADA system is a control systems that provide the trains with the electricity. A railway SCADA system sends commands to the RTUs(remote terminal unit) and then it gathers status information of the field devices in the RTUs or controls field devices connected with the RTUs. The RTU can controls input output modules directly, gathers the status information of the field devices connected with it, and send the information to the control center. In this way, a railway SCADA system monitors and controls the electricity power for running trains. The cyber attackers may use some vulnerabilities in the railway SCADA system software to attack critical infrastructures. The vulnerabilities might be created in the railway software development process. Therefore it need to detect and remove the vulnerabilities in the control system. In this paper we propose a new control protocol fuzzing method to detect the vulnerabilities in the DNP3 protocol based application running on VxWorks in RTU(Remote Terminal Unit) that is a component of the centralized traffic control system for railway. Debug-channel based fuzzing method is required to obtain process status information from the VxWorks.