• Journal of the Korean Society of Safety
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• v.17 no.4
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• pp.196-201
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• 2002

Web-based predictive maintenance (PM) utilizes Virtual Device Network (VDN). VDN inevitably the implementation of Distributed Monitoring and Control Networks (DMCN). In general, one needs to integrate fieldbus protocol and TCP/IP to realize DMCN over IP network or internet, which can be viewed as Virtual Device Network (VDN). Interoperability between devices and equipments is essential to enhance the quality and the performance of predictive maintenance (PM). This paper investigates the transmission characteristics of VDN and suggests a basic framework for web-based PM using DMCN over IP network.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.37 no.5
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• pp.13-21
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• 2000

In this paper, we investigate the performance improvement by applying flow control to LonWorks-based network systems which support various communication media together with interpretable class of systems. To this end, we introduce a circular queue at each node of industrial network systems usually operated in open loop. Then we utilize the feedback information of the number of data in a queue, the data arriving interval in a queue and channel error to make the overall industrial network system in closed loop. We verify the improved performance of the network systems in view of throughput and fairness measures via the experimental results conducted in several field situation.

• Proceedings of the IEEK Conference
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• 2003.07c
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• pp.2661-2664
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• 2003

인터넷의 편재성과 유용성 때문에 인터넷이 산업현 장에까지 확장 적용될 필요성이 증대되고 있다. 따라서 본 논문에서는 원격지나 또는 바로 산업 현장에 대한 예측가능 유지 보수가 수행될 수 있도록 하는 가상 디바이스 네트워크의 관리 시스템에 대한 개념을 제시하다. 디바이스 제어 네트워크로서 LonWorks 네트워크를 선택하고. 데이터 네트워크로는 이더넷을 선택하여 가상 디바이스 네트워크를 구성하였다. 가상 디바이스 네트워크를 구현하기 위해 LonTalk/IP 게이트웨이/웹 서버를 이용하였다. 가상 디바이스 네트워크의 운영 및 관리를 통한 응용 예로서 기업의 가상 머신/생산 시스템에 관한 예측 유지보수 예를 제시하였다.

• Proceedings of the KIEE Conference
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• 2003.07d
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• pp.2358-2361
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• 2003

In this paper, parallel control method that enables coordinating operations of multiple mini ice storage air conditioner is proposed based on LonWorks system. The proposed parallel control method is a kind of master/slave control method based on LonTalk network communication. In the control method, master controller leading whole system operations is determined by date to avoid the disproportion of outdoor unit operations. In addition to the above, duty shift control method is proposed to avoid redundant operations of outdoor units and to equalize the operation frequencies of them. Through some simulation tests, the proposed parallel control method and the duty shift control method are evaluated and the efficiencies of them are validated by comparing with existing methods.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.04b
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• pp.1579-1582
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• 2002

LonWorks 을 이용해 홈 네트워크를 구성할 수 있다. 기존에는 하나의 노드가 되는 조명, 딤머(dimmer), 스위치에 해당하는 디바이스를 중앙 집중식으로 제어할 수 있는 컨트롤러가 개발되어 왔다. 본 논문에서 제시하는 컨트롤러는 스위치와 조명사이에 데이터를 처리하는 중개자의 역할을 하는 중요한 오브젝트이다. 본 논문에서는 이 기술의 핵심인 LonTalk 프로토콜을 설명하고 네트워크에 구성되는 컨트롤러에 대해 주소 지정방식을 이용하여, 여러 개의 조명을 연결될 수 있도록 네트워크 변수 타입을 제시하였다. 뉴런(Neuron)C 로 펌웨어(Firmware)를 구성하여 결과값을 얻을 수 있었고, LonWorks의 어플리케이션인 LNS(Lonworks Network Service)를 통해 플러그 인 부분까지 구현하여 해당 결과값을 확인할 수 있었다.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2002.11a
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• pp.355-361
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• 2002

There are many economic and operational reasons to integrate fire alarm signaling system with other building automation system. Integration of this requires open network with for the standard communication protocol and careful design practices. The important point for this is also the development of intelligent control modules for replacing the conventional zone adapter in fire system. Therefore, this paper proposes an new conceptual design of the open distributed fire alarm signaling system for the integration of BAS, a new intelligent control modules with LonTalk protocol and a new control modules for power line communication. Newly proposed additions to LonWorks network make it very well suited for integrating fire systems with other building automation sub-systems and another BAS with low cost. Additionally, it is very important that best design practices, test procedures and building codes need to be modernized to accommodate integrated building systems.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.18 no.1
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• pp.115-121
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• 2004

In this paper, a new distributed intelligent control module based on LonWoks fieldbus for air handling unit(AHU) of heating, ventilating and air-conditioning(HVAC) is proposed to replace with a conventional direct digital control(DDC) system with 32 bit microprocessor. The proposed control architecture has a excellent features such as highly compact and flexible function design, a low priced smart front-end and reliable performance with various functions. This also addresses issues in control network configuration, logical design of field devices by S/W tool, Internet networking and electronic element installation. Experimental results for showing the system performance are also included in this paper.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.06a
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• pp.1007-1012
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• 2005

This paper presents requirements of home network protocol for home netowkr system. Home network protocol is designed to satisfy the above requirements on the assumption that it has to be implemented by software on the microprocessors generally used in household appliances. And, we execute a qualitative comparison to other protocols such as CEBus, LonWorks and LnCP.

• 유체기계공업학회:학술대회논문집
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• 2003.12a
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• pp.535-540
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• 2003

In this Paper, a LON based distributed control system for HVAC is described. We developed multi-protocol converter based on SoC, Neuron Chip, embedded Linux. It utilizes the network environment and therefore requires an appropriate operating system for handling protocols and an advanced development environment. The open source licensing, reliability, and broad hardware support are key reasons for use of embedded Linux in embedded industry. The multi-prootocol converter integrates LonWorks devices to a client with Java applet. The system consists of three-tier architecture, such as clients, multi-protocol converter, and LonWorks devices. The experiment result show that multi-protocol converter using embedded Linux is a flexible and effective way to build a Web-based monitoring and control system.

• 제어로봇시스템학회:학술대회논문집
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• 2004.08a
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• pp.1205-1210
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• 2004

The 4-20mA analog signal used in the various industrial fields to interface sensor in distributed process control has been replaced with relatively simple digital networks, called "fieldbus, and recently by Ethernet. Significant advances in Internet and computer technology have made it possible to develop an Internet based control, monitoring, and operation scheduling system for heating, ventilation and air-conditioning (HVAC) systems. The seamless integration of data networks with control networks allows access to any control point from anywhere. Field compatible field devices become so-called "smart" devices, capable of executing simple control, diagnostic and maintenance functions and providing bidirectional serial communication to higher level controller. The most important HVAC of BAS has received nationwide attention because of higher portion of more than 40% in building sector energy use and limited resources. This paper presents the Internet-based monitoring and control architecture and development of LonWorks control modules for AHU (air handling units) of HVAC in viewpoint of configuring BAS network. This article addresses issues in architecture section, electronics, embedded processors and software, and internet technologies.