• Proceedings of the KIPE Conference
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• 2005.07a
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• pp.143-145
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• 2005

This paper describes the transmission method of an information using communication networks between RTU(Remote Terminal Unit) and PCU(Protection and Control System) of the DC switchgear for Light Railway Vehicle. Also the test result carried out in the laboratory was represented. In this test, transmission signal waveform, polling time, response time and request/response frame between RTU and PCU were measured. The field test including the measurements of analog signal and status of the digital logic operation of PCU was conducted in Gyeongsan Test Track.

• Proceedings of the KIEE Conference
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• 1998.07g
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• pp.2393-2395
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• 1998

Today it is hard to imagine the operation of power network and its facilities without the control systems such as EMS/SCADA/DAS. In KEPCO, data links to the upper layer of control system (SCABA) is required to launched DAS project lately, in terms of the needs of saving cost for the data gathering facilities (RTU) in the substation that previously equipped SCADA RTU. In this Paper we researched the circumstance of the KEPCO SCADA systems for data link and present the scheme of the data link between DAS and SCADA.

• Proceedings of the KIPE Conference
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• 2001.07a
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• pp.619-622
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• 2001

In this paper, an intelligent demand control system was introduced. This system is composed of demand controller, RTU, Power Line Modem and HMI program. The developed demand controller was capable of synchronizing with watthour meter recommended by KEPCO. To control distant loads, network function using powerline communication is implemented in RTU, with HMI program, the untrained users are able to operate system easily. Additionally using the Powerline, the cost and time of installation is saved. The system performance was proved In a several experiments.

• Journal of Energy Engineering
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• v.18 no.3
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• pp.147-155
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• 2009

Demand for distributed source by new and renewable energy has been gradually increasing recently. For the characteristics of distributed generation, distributed source is located near the distribution system and customers' buildings and can be operated in standalone mode or in interface mode with distribution system. When the distributed sources are interfaced with distribution system, the standard for interfacing distributed source with existing distribution system and operation manual should be updated with revisions in order to manage the distributed source effectively and operate the distribution system stably because how to operate the interfaced system is different from that of existing distribution system. In this paper, the FEP(Front End Processor) using the international standard protocol IEC-60870 for interfacing with distributed resources was designed. The designed system was verified via the test result using main control system for distributed generation and RTU(Remote Terminal Unit) for interface with distributed power generating.

• The KIPS Transactions:PartA
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• v.17A no.4
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• pp.197-202
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• 2010

The recorder at observatory can save the measured data from water gauge and rain gauge at an interval of five minutes. And then, the RTU (Remote Terminal Unit) in observatory sends the measured data in the recorder to the TM (Telemetering) in FCO (Flood Control Office) at an interval of ten minutes using VHF or satellite communication. But the transmitted data is not the stored data at the recorder, it is just data that is measured at an interval of ten minutes. In the FCO, the transmitted data is analyzed in order to forecast the flood. And also one of the most important things is the maintenance of an observatory. In this paper, an effective management system for the flood forecast is proposed. It uses the CDMA and the Blutooth technology on PDA. The proposed system is very portable, and also easily able to send the data stored at the recorder in observatory to TM in FCO without RTU. And it allows us to view remotely the data of other observatories by downloading from the FCO. Hence the system can do efficiently the maintenance of observatory without wasting manpower and time.

• Journal of Drive and Control
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• v.10 no.2
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• pp.7-12
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• 2013

In this study, a wire/wireless communication system transmitting the operation data of engine from the ER (Engine Room) to the engine controller of ECR(Engine Control Room) has been developed through the communication of ISM(Industrial Science Medical) Band for the test operation environment improvement of medium speed engine. This wire/wireless communication system is composed of the RTU (Remote Terminal Unit) gathering and transmitting engine data as well as the MCU (Master Control Unit) receiving engine status information from the RTU to be sent to the engine controller (PLC). Through this study, a trial product of RTU and MCU has been manufactured. A test bench that has made temperature, pressure and pick-up sensor into a module for the local test of prototype was produced a test bench. In addition, at the same time save the data to a Web server and the smart phone real-time monitoring system has been developed using Wi-Fi communications. The ultimate objective of this study is to develop a wireless smart phone monitoring system of engine for the operator of engine to be able to monitor and control engine status even from the outside of engine room and control room based on this study.

• The KIPS Transactions:PartC
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• v.16C no.1
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• pp.37-50
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• 2009

The SCADA(Supervisory Control And Data Acquisition) system is a control system for infrastructure of nation. In the past, the SCADA system was designed without security function because of its closed operating environment. However, the security of the SCADA system has become an issue with connection to the open network caused by improved technology. In this paper we review the constraints and security requirements for SCADA system and propose advanced key management architecture for secure SCADA communications. The contributions of the present work are that our scheme support both message broadcasting and secure communications, while the existing key management schemes for SCADA system don't support message broadcasting. Moreover, by evenly spreading much of the total amount of computation across high power nodes (MTU or SUB-MTU), our protocol avoids any potential performance bottleneck of the system while keeping the burden on low power (RTU) nodes at minimal.

• Journal of Animal Science and Technology
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• v.45 no.2
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• pp.183-190
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• 2003

Data from live animal real time ultrasound (RTU) measures from 127 Hanwoo steers were used to assess nutritional physiology and relationship between RTU measures and real carcass measures represented meat quality. Traits considered were longissimus muscle area, fat thickness, and marbling score imaged and scanned using RTU by month and those of carcass measures at about 24 month of age. On this study, increasing pattern for longissimus muscle area would be closely related to growth pattern (p<0.01) and it of fat thickness would be related to quadratic effect of ages. Marbling score would be related to aging, that is, individual deviates of scores were distinctly characterized after 17 mo. even though they were started at about 11 mo. Correlation estimates between RTU measures and corresponding carcass traits were over 0.6 after 17 month of age for all traits considered and these estimates were high as 0.90 after 22 month of age. From this study, Real-time ultrasound measurement would be valuable after 15-17 mo. and measures at about 22 mo. would be helpful to decide age for slaughtering. To utilize these techniques for beef cattle breeding via progeny testing program, 15 mo. RTU measures would be efficiency rather than 12 mo. of other beef breeds. Further study to find genetic variation of RTU measures was needed to utilize these technologies for beef breeding.

• Journal of the Korean Institute of Gas
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• v.27 no.1
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• pp.57-62
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• 2023

The Gas Regulator EVENT is a signal sent by the Remote Terminal Unit(RTU) installed in each local gas regulator (hereinafter referred to as "regulator"), and is an abnormal alarm that can be intuitively checked in our client server. This is an important data that enables immediate dispatch order and initial action in the situation room when a regolator abnormality occurs, and can analyze the cause of the regulator abnormality. Looking at the trend of EVENT data for regulator over the past three years, there is a clear trend of increasing unchecked EVENT data. The increase in non-checking event (actual abnormality or noise event) may mean that firstly, mechanical or pressure abnormality occurs in the actual regulator, and secondly, there is no abnormality in the actual regulator, but communication error occurred in the RTU, reset. EVENT Data may be formed as if an abnormality occurred in the static voltage due to an error, sensor error, power failure (instantaneous power failure), etc. Among them, this study analyzed the recently generated unchecked EVENT data to identify critical noise events among RTU errors, which are noise events, and reviewed ways to increase the reliability of Regulator EVENTs by reducing them.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2023.11a
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• pp.27-29
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• 2023

본 연구에서는 항로표지 통합관리시스템 자국 운영 예산 절감 및 데이터 신뢰성 향상을 위한 문제점 분석 및 전원연계형 RTU 개발을 진행하였으며, 대산청에서 실제 적용 중인 항로표지 점검정비 절차 표준화 방안, 해양구조물 경계표시등 설치방법, 정비점검 현장 안전개선사항에 대해 검토하였다