• Proceedings of the KIEE Conference
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• 2007.10a
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• pp.237-238
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• 2007

국내 산업현장에서 공장시스템들을 효율적이고 유기적으로 연결시키기 위해서 산업네트워크인 산업용 프로토콜을 활용한다. 그중에서도 국내 굴지의 석유화학 공정에서는 Modbus Protocol을 사용하고 있다. 하지만 이에 대한 연구가 국내에서는 매우 열악하여 제대로 된 정보를 찾기 힘들다. 이에 국내 산업환경에서 활용하는 모드버스 프로토콜을 개선하여 이를 현장에 적용하는 연구를 하게되었다. 이전 연구에서는 모드버스 프로토콜 개선을 위해서 캐쉬 기법을 적용하여 탱크 데이터 처리 시간을 단축시키는 결과를 도출하였으며 이를 이용하여 석유화학 공정 탱크의 교체시기를 판별하였다. 이번에는 모드버스 캐쉬 기법을 이용하여 탱크사용 예측과 하드닝 기법을 적용한 탱크 테이터예측 알고리즘을 설계하고 이를 시뮬레이션 결과를 소개하고자 한다.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.60 no.7
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• pp.1324-1330
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• 2011

This paper presents the development of gateway for smart grid for the interoperable communication between IEC 61850 station leveled devices and one of legacy Modbus, DNP3, and IEC60870-5-101/104/103 communication protocol devices of bay level in substation or for the exchange of information between IEC 61850 substation and SCADA control center. The data-mapping model is designed for the exchange of information and the gateway configuration tool is developed for generating meta-data based on XML Schema. this paper is mostly concerned with the design and realization of gateway system for the interoperable data communication between a legacy protocol device and IEC61850 based devices or systems.

• Proceedings of the KIEE Conference
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• 2001.07d
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• pp.2169-2171
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• 2001

The vacuum gauge control system has been designed and implemented using multi-serial communication controllers (MSCC) for the 2.5 Gev storage ring at the Pohang Accelerator Laboratory (PAL). There are 20 Balzers vacuum gauges and 17 Granville-Phillips vacuum gauges at the storage ring. A MSCC have two RS485 (max speed 460.8Kbps) field network port, 8 channel serial communication ports (max speed 460.8Kbps) connected to gauge controller for serial communication control. 12 MSCCs are connected to a personal computer (PC) through the RS485 field network. The PC can automatically control the MSCCs by sending set of commands through the network. The commands specify the duration of the MODBUS protocol. Upon receiving a command from a PC running under Windows2000 through the network, the MSCC communicate through the serial output ports to gauge controller. In this paper, we describe control structure and scheme of the vacuum gauge control system.

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2001.05a
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• pp.192-196
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• 2001

These days, most of electric power facilities need high stability. Therefore integrated system has been required to monitor and control electronic power distribution system in fields at all times when the interruption of electric power has occurred. To construct this system, unit that convert and process the input signal from fields needed. And for control and monitoring from remote place MMI software is required. Lastly network equipments are required for real-time communications. So, in this paper, units for control and monitoring of emergency power generator and for electric power monitoring in normal electric power and interruption of electric power are developed. Also integrated remote system for monitoring in remote is developed.

• Proceedings of the Korea Information Processing Society Conference
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• 2019.10a
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• pp.405-406
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• 2019

ICS 해커들의 주요 목적은 재정적 이득, 기업간첩, 테러리스트 활동, 국가간의 사이버전쟁, 잘못된 윤리적 해킹 등의 이유들이 있다. 이에 따른 해킹 경로로는 산업제어 시스템이 공용 인터넷에 노출되는 경우, 기기 초기 설정을 방치, 장기간의 비밀번호 미 변경, 포트스캐닝, 구글 해킹 등이 있다. 이에 따른 대표적인 해킹방식 5 가지가 있는데 첫째, Shodan 을 이용한 일종의 검색해킹, 둘째, ZAP 툴을 이용하여 전수공격을 하는 패스워드 퍼징, 셋째, 목표 사이트의 취약점을 이용하여 인증을 우회하는 공격인 SQL Injection, 넷째, Modbus 툴을 이용한 해당 시설의 전압을 변경하는 네트워크 공격, 다섯째, zbgoodfind 툴을 통한 원격장치공격이 있다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2019.01a
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• pp.137-140
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• 2019

본 논문에서는 자동 제어 시스템의 이상행위를 분석하기 위하여 MODBUS 프로토콜 기반의 제어 명령을 수집 분류하여 등록된 화이트리스트 기반으로 이를 탐지하는 시스템을 구현하였다. 구현 시스템은 자동 제어 시스템 기반으로 다양한 생산설비를 동작시키는 스마트팩토리 시스템을 비롯하여 국가기간 산업에 활용 가능하며, 생산설비의 이상 작동을 확인하기 위하여 생산설비의 동작 신호를 주기적으로 수집 분석하여 정상적인 작업형태에서 벗어나는 이상 작업을 판단할 수 있도록 구성하였다. 또한, 소형화된 공장 자동화 설비를 구성하여 실제 스마트팩토리 환경에서 제어명령을 수집하고, 수집된 신호로부터 이상 작동을 검출하는 제안 시스템의 구현 결과를 설명한다.

• Journal of Digital Convergence
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• v.12 no.10
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• pp.337-343
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• 2014

The PRT(Personal Rapid Transit) in material or immaterial guided tracks is operated automatically according to the needs of passengers with the optimal non-stop path from the source to the destination. In recent years, the personal rapid transit (PRT) system, which affords superior accessibility and ease of use, has been spotlighted as a new transport system for the future. In this study, a method for vertical lifting of PRT vehicles was proposed to facilitate interlink with other means of transport and thereby improve the efficiency of door-to-door transport. For this purpose, operation control interfaces were designed and experiments were conducted. Programmable Logic Controller (PLC) dedicated for the PRT vertical lift was designed to interface with Operation Control Center (OCC) by Modbus TCP over Ethernet. We implemented a 3D graphical PRT operation simulator which can emulate the mixing operation of the virtual vehicles and the actual vehicles.

• Journal of the Korean Society of Marine Environment & Safety
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• v.29 no.6
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• pp.653-658
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• 2023

In systems like the combat management system of a naval ship or smart city of civilians, where many sensors and actuators are connected, the middle-ware DDS (Data Distribution Service) is mainly used to transmit large amounts of data. It is scalable and can effectively respond to the increase in sensors or equipment connected to the system in the future. The engineering control system (ECS), which plays an important role similar to the combat management system of a naval ship, still uses Server-Client model with industrial protocols such as Modbus and CAN (Controller Area Network) bus, to transmit data, which is unfavorable in terms of scalability. However, as automation and unmanned systems advance, more sensors and actuators are expected to be added, necessitating substantial program modification. DDS can effectively address such situations. The purpose of this study is to confirm the development possibility of an integrated monitoring and control system of a ship by using OpenDDS, which follows the OMG (Object Management Group) standard among the middle-ware DDS used in the combat management system. To achieve this goal, field equipment simulators and an ECS server were configured to perform field equipment data input/output and simulation using DDS was performed. The ECS prototype successfully handled data transmission, confirming that DDS is capable of serving as the middle-ware for the ECS of a ship.

• Journal of Institute of Control, Robotics and Systems
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• v.9 no.4
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• pp.340-346
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• 2003

Driven by the growth of the Internet and the increasing ubiquity of embedded computing systems, the embedded system is exploding in terms of it proliferation of products and the number of complex applications. Intelligent dedicated systems and appliances used in interface, monitoring, communications, and control applications increasingly demand the services of a sophisticated, state-of-the-art operating system. In the case of industrial controller, it is required to use a real-time operating system (RTOS) as a good building block to enable Internet connectivity. However, commercial RTOSes are increasingly less desirable due to their lack of standardization and their inability to keep pace with the rapid evolution of technology. In order to overcome these problems, we consider using embedded Linux and embedded web server. Availability of source code, reduced licensing, reliability, open source community support, as well as others, are key reasons for the use of embedded linux by embedded developers. In this paper, we develop embedded linux platform to control the industrial inverter with the Internet connecting feature. The method of web-based management is also proposed by using the embedded web server and Java applet. We show the feasibility of remote management for the commercial inverter controller with the proposed three-tier web-based remote management system.

• Journal of Korea Multimedia Society
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• v.23 no.10
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• pp.1307-1317
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• 2020

In recent years, the PV plant is gradually increasing in korea and has begun to focus on PV system O&M(Operation and Management). The legacy PV system can hardly be gathering realtime information. That is why it is difficult for the facility to respond immediately to situations in which problems arise. This leads to economic losses due to reduced power generation. In this study, we implemented an RMC(Remote Maintenance Control) gateway that supports multi-area equipment(inverters, junction boxes, switchboards, environmental sensors) that are not limited to specific manufacturers. It provides a function to visualize the collected data. Users can easily check the power generation and operation status of PV system equipment. In the future, we will develop an algorithm capable of analyzing beta factors that cause equipment performance degradation, parts aging, and deterioration using data collected from facilities. We intend to use this algorithm as a fundamental technology for O&M by transplanting it to the RMC gateway.