• Proceedings of the KAIS Fall Conference
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• 2006.05a
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• pp.494-497
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• 2006

홈네트워크 기술 중 전력선 통신은 ‘No New Wire'의 개념으로 기존 가정에서 홈네트워크 구축을 위해 신규배선을 필요로 하지 않기 때문에 댁내 백본 네트워크로 많은 관심을 받고 있다. 그러나 PLC 네트워크 구축시 사람이 수동으로 설정해주어야 함으로써 사용자는 어려움을 느끼고 있다. 이에 본 논문에서는 PLC 디바이스의 전원이 인가되면 그룹 코드와 디바이스 ID를 자동으로 부여받아 사용자의 별도 개입없이 PLC기기를 사용할 수 있는 Intelligent PLC 모뎀을 구현하고 이를 관리할 수 있는 메시지 형식을 설계 구현한다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2015.07a
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• pp.161-163
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• 2015

본 논문은 교통 혼잡도가 높은 월계 2교 4거리 교차로에 센서를 이용하기 위한 교차로 PLC 프로그램을 개발하는 것을 목적으로 한다. 이를 위해 교차로에서 발생하는 차량사고와 혼잡을 방지하지 위한 소프트웨어 요구사항 명세서(SRS)를 정의하고, 이를 바탕으로 소프트웨어 설계서를 작성한다. 또한 XP-Builder 시뮬레이터를 사용하여 센서기반 교차로 신호등 PLC 프로그램을 구현한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2006.11a
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• pp.31-34
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• 2006

최근의 PLC는 Ethernet 통신, Field Bus등 새로운 통신규약에 호환성을 갖고 있으며 점점 빠른 연산 속도의 초소형 PLC로 발전해 나가고 있고 공장 자동화와 FMS(Flexible Manufacturing System)에 따른 PLC의 요구는 과거 중규모 이상의 릴레이 제어반 대체 효과에서 현재 고기능화, 고속화의 추세로 소규모 정작 기계에서 대규모 시스템 설비에 이르기까지 적용되고 있다. 그러나 현재 사용되고 있는 PLC는 각 제조사마다 하드웨어형식은 유사하지만 소프트웨어형식인 제어 명령어들이 다르기 때문에 각각의 PLC마다 호환이 되지 않는다는 문제점을 가지고 있어 이 제어 명령어들의 호환성을 위한 솔루션이 필요하다. 이를 해결하기 위하여 본 논문은 IEC1131-3의 표준 언어를 중심으로 제어할 수 있는 Mo-aPLC라는 모바일 에이전트 기반의 softPLC시스템을 제안하였다. 이 시스템은 모바일 에이전트들이 지적 대리인으로서 IEC1131-3의 표준 언어를 제어시스템 제작자에게 활용되어 질 수 있는 코드인 IL언어로 변환하고 이를 랭귀지 프로그래머가 활용할 수 있는 코드인 표준 C코드로 변환하는 것이다. 이 시스템으로 인해 제어시스템 제작자와 랭귀지 프로그래머들이 활용할 수 있는 코드들이 생성되는 것과 표준 C코드로 변환함으로서 논리적인 디버깅(dubugging)이 용이하다는 것을 알 수 있었다.

• Journal of Advanced Information Technology and Convergence
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• v.9 no.1
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• pp.25-37
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• 2019

Power-line communication (PLC) has influenced smart grid development. In addition, PLC has also been instrumental in current research on internet-of-things (IoT). Due to the implementation of PLC in smart grid and IoT environments, strides have been made in PLC and its combination with the wireless system to form a hybrid communication system. Also, PLC has evolved from a single-input-single-output (SISO) configuration to multiple-input-multiple-output (MIMO) configuration system, and from a point-to-point communication system to cooperative communication systems. In this work, we extend a MIMO wireless two-way amplify-and-forward (AF) cooperative communication system to a hybrid PLC and wireless (PLC/W) system configuration. We then maximize the weighted sum-rate for the hybrid PLC/W by optimizing the precoders at each node within the hybrid PLC/W system. The sum-rate problem was found to be non-convex, therefore, an iterative algorithm is used to find the optimal precoders that locally maximize the system sum-rate. For our simulation results, we compare our proposed hybrid PLC/W configuration to a PLC only and wireless only configuration at each node. Due to an improvement in system diversity, the hybrid PLC/W configuration outperformed the PLC only and wireless only system configurations in all simulation results presented in this paper.

• Korean Journal of Computational Design and Engineering
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• v.14 no.1
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• pp.60-68
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• 2009

Because of the reduced product life-cycle, industries are making an effort to bring down the process planning time. In the traditional approach, we have to analyze established process planning, then design the time chart based on process information and drawing the formal time chart such as SOP(sequence of operation). Thereafter, it will be converted to PLC code that is a time consuming and redundant job. Similarly, Industrial automated process uses PLC Code to control the factory; however, control information and control code(PLC code) are difficult to understand. Hence, industries prefer writing new control code instead of using the existing one. It shows the lack of information reusability in the existing process planning. As a result, to reduce this redundancy and lack of reusability, we propose SOS-Net modeling method. Unlike past stabilized process planning that is rigid to any change; our proposed SOS-Net modeling method is more adaptable to the new changes. The SOS-Net model is easy to understand and easy to convert into PLC Code accordingly. Therefore, we can easily modify the control information and reuse it for new process planning. The proposed model plays an intermediary role between process planning and PLC code generation. It can reduce the process planning and implementation time as well as cost.

• Proceedings of the KIEE Conference
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• 2004.11c
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• pp.403-405
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• 2004

This paper describes an implementation of Home network Control Protocol(HnCP) and it's application to an Intelligent lighting system. The HnCP was announced by korea PLC forum in June 2003 to provide a network protocol for PLC based home appliances. The HnCP master and HnCP slaves were implemented using XPLC30 which is an SOC with ARM9 core. The efficacy of the developed HnCP network modules were shown by applying them to a intelligent lighting system composed of dimmable fluorescent lamps. An extended message set was proposed for the intelligent lighting system and we proposed some directions for the future development of HnCP.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1947-1948
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• 2008

This paper presents the implementation of Power Line Communication(PLC) module which can reduce standby-power consumption. The suggested PLC module consists of PLC modem, coupling circuit, ZCP(Zero-Cross Point) Circuit and main SMPS control relay. The test results under power line communication test-bed used home appliance show the 77% saving of standby-power.

• Journal of Advanced Marine Engineering and Technology
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• v.29 no.4
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• pp.384-390
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• 2005

This paper addresses the design and implementation of a wireless network. proposed as a cost-effective support platform for PLCs. With this network. one or more supervising stations may access remote equipment like PLCs. An applicable communication methods are described and we applied efficient method among them to PLCs communication. The paper specifies these requirements and indicates methods to fulfill them. Also. it provides to the model of operation, and focuses on the implementation approach. The hardware and software design is described together with a number of critical points related to wireless communication on the Cnet. Furthermore, a discussion on system expandability and performance is tackled and some observations are stated. The main conclusion is, that the proposed method can feature good performance under normal operating conditions.

• Journal of the Institute of Electronics and Information Engineers
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• v.51 no.10
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• pp.228-234
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• 2014

In the case of construction equipment, internal wiring has a very complicated structure such as an electrical wiring and hydraulic equipments. Because of these complex wiring, a lot of time is spent on maintenance and equipment manufacturing. In this paper, we design and implementation of the high-reliability PLC(Power Line Communication) -CAN(Controller Area Network) communication module to reduce electrical wiring of the construction equipment.

• Journal of the Korea Society of Computer and Information
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• v.15 no.11
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• pp.185-193
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• 2010

In this paper, we Provide context-aware services based on UPnP Device Module including sensor unit in existing PLC network without additional infrastructure. so existing PLC devices are controlled based on knowledge context and can be used in a ubiquitous environment. And efficient remote control and device management based on UPnP can also be provided.