• 한국통신학회논문지
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• 제28권11B호
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• pp.1023-1030
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• 2003

본 논문에서는 서로 다른 요구조건을 갖는 응용 서비스들을 지원하는 가입자 접속망에서 서비스 고유의 서비스 품질을 효과적으로 지원하기 위한 대역 할당 방안을 다룬다. 음성 및 실시간 비디오 등의 지연에 민감한 실시간 트래픽과 데이터 및 BE(Best Effort)와 같은 비 실시간 트래픽 등 다중 응용 서비스를 지원해야 하는 EPON(Ethernet Passive Optical Network)망에서 상향 트래픽의 동적 대역 할당방안에 대하여 논하기로 한다. 구조적으로 제한된 자원 환경에서 상향 전송 대역을 효율적으로 사용하고, 실시간 트래픽의 지연성능을 향상하는 새로운 방안을 제안하고, 시뮬레이션으로 제안된 방안의 지연성능을 분석한다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.1767-1770
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• 2003

This paper proposes an efficient network architecture for reflective memory system (RMS). Using this architecture, the time for broadcasting a shared-data to all nodes can be significantly shortened. The device named topology conversion switch (TCS) is implemented to realize the network architecture. The implemented TCS is applied to the ethernet based real time control network (ERCnet) to evaluate the performance.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 학술대회 논문집 정보 및 제어부문
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• pp.86-88
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• 2004

As the rapid incensement of the number of internet users has occurred recently, many multimedia application services have been emerging. To improve quality of service, traffic can be suggested to be classified with priority in EPON(Ethernet Passive Optical Network), which is supporting the multimedia application services. In this paper, multimedia application services treat bandwidth classifying device in serving both delay sensitive traffic for real-time audio, video and voice data such as VoIP(Voice over Internet Protocol), and nonreal-time traffic such as BE(Best Effort). With looking through existing mechanisms, new mechanism to improve the quality will be suggested. The delay performances and packet losses of traffic achieved by supporting bandwidth allocation of upstream traffic in suggested mechanism will be analyzed with simulation.

• 정보와 통신
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• 제32권10호
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• pp.31-40
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• 2015

This paper investigates several existing techniques to reduce high-availability seamless redundancy (HSR) traffic. HSR is a redundancy protocol for Ethernet networks that provides duplicated frames for separate physical paths with zero recovery time. This feature makes it very useful for real-time and mission-critical applications, such as military applications and substation automation systems. However, the major drawback of HSR is that it generates too much unnecessary redundant traffic in HSR networks. This drawback degrades network performance and may cause congestion and delay. Several HSR traffic reduction techniques have been proposed to reduce the redundant traffic in HSR networks, resulting in the improvement of network performance. In this paper, we provide an overview of these HSR traffic reduction techniques in the literature. The operational principles, advantages, and disadvantages of these techniques are investigated and summarized. We also provide a traffic performance comparison of these HSR traffic reduction techniques.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2009년도 추계학술대회
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• pp.98-101
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• 2009

최근에는 차량 진단을 위한 방법으로 차량 내 네트워크 방식이 사용되고 있으며, CAN(Controller Area Network), MOST, LIN, FlexRay와 같은 차량 프로토콜의 사용 증대로 인해 차량에 대한 분산 제어와 원하는 데이터를 실시간 모니터링 하기 위한 방법들이 모색되고 있다. 현재의 자동차의 경우 자가진단 점검단자인 OBD2(On Board Diagnostics)표준 DLC(Data Link Connector)커넥터를 이용한 진단용 모듈(스캐너)을 통해 차량을 진단 한다. 그러나 엔진과 동력전달 계통(Powertrain) 부분으로 진단이 국한되어 있고, 사용자 측면을 고려하지 못하였다. 따라서, 본 논문에서는 Ethernet port를 이용한 차량 진단 모니터링 시스템을 설계하여 CAN 프로토콜 차량 데이터를 송수신하고 PC를 이용하여 보다 간편하게 차량의 상태와 정보를 제공하고 진단할 수 있는 모니터링 시스템을 구현한다.

• 한국멀티미디어학회논문지
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• 제14권6호
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• pp.794-801
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• 2011

공장의 주요 설비들은 설비의 운전정보를 관리자에게 보여주기 위한 다양한 디지털 지시계를 가지고 있는 경우가 많은데, 생산성을 향상시키기 위한 공장 자동화를 위해서 다양한 설비들의 운전 정보를 원격지에서 제어할 필요가 있다. 원격지 통신을 위해서 이더넷(Ethernet) 인프라를 이용하면 편리하지만, 국내 공장에서 보유한 생산설비의 경우 아직도 많은 설비들이 RS232C나 RS485통신 방식만을 지원하는 경우가 많다. 이러한 경우에 RS232C나 RS485틀 사용해서 통신하는 설비의 운전정보를 Ethernet으로 변환해주는 것이 필요하다. 본 논문에서는 무선 인터넷 기반에서 원격지에 있는 설비를 제어하기 위해서 자바와 시리얼통신용 RxTx 패키지를 이용한 통신 프로그램 구현 방법을 보인다. 시스템의 구현을 위해 현재 운전되고 있는 설비의 상태를 파악하기 위해 RS485 통신이 가능한 산업용 디지털 지시계와 열전대를 사용하여 온도 정보를 전송하도록 하드웨어를 구성하였고, RS485로 입력된 정보를 RS232c로 변환하는 변환기를 거친 후, 무선 Ethernet으로 변환해주는 변환기를 설치한 후, 서버와 통신하도록 구현하였다.

• IEIE Transactions on Smart Processing and Computing
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• 제5권1호
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• pp.55-62
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• 2016

In this paper, we propose a hybrid multi.system-on-chip (H-MSoC) architecture that provides a high-flexibility system in a rapid development time. The H-MSoC approach provides a flexible system-on-chip (SoC) architecture that is easy to configure for physical- and application-layer development. The physical- and application-layer aspects are dynamically designed and modified; hence, it is important to consider a design methodology that supports rapid SoC development. Physical layer development refers to intellectual property cores or other modular hardware (HW) development, while application layer development refers to user interface or application software (SW) development. H-MSoC is built from multi-SoC architectures in which each SoC is localized and specified based on its development focus, either physical or application (hybrid). Physical HW development SoC is referred to as physical-SoC (Phy-SoC) and application SW development SoC is referred to as application-SoC (App-SoC). Phy-SoC and App-SoC are connected to each other via Ethernet. Ethernet was chosen because of its flexibility, high speed, and easy configuration. For prototyping, we used a LEON3 SoC as the Phy-SoC and a ZYNQ-7000 SoC as the App-SoC. The proposed design was proven in real-time tests and achieved good performance.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2003년도 제20회 춘계학술대회 논문집
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• pp.207-210
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• 2003

The purpose of this work is to introduce the Remote Control System for KSR-III Liquid Rocket Propulsion System. We developed the high reliable Fire control System that needed for long distance control. We carried out a real time remote control and measuring for KSR-III lust Liquid Propulsion Rocket in Korea using TCP/IP Ethernet network method and Fiber-optic communication method. Also HMI operation program developed guarantee confidential control, monitoring and analysis for Fire control operation.

• 제어로봇시스템학회논문지
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• 제8권5호
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• pp.434-437
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• 2002

A small size and light-weight DSP board is newly designed for a real time multi-distributed control system that overcomes constraints on time and space. There are a variety of protocols for a real-time distributed control system. In this research, we selected CAN for the multi distributed control, which was developed by the BOSCH in the early 1980's. If CAN and Internet are connected together, the system attains the characteristics of a distributed control system and a remote control system simultaneously. To build such a system. The TCP/IP-CAN Gateway which converts a CAN protocol to TCP/IP protocol and vice verse, was designed. Moreover, the system is required to be small and light-weighted for the high mobility and cost effectiveness. The equipment in remote place has a TCP/IP-CAN Gateway on itself to be able to communicate with another systems. The received commands in the remote site are converted from TCP/IP protocol to CAN protocol by the TCP/IP-CAN Gateway in real time. A simulation system consists of a TCP/IP-CAN Gateway in remote place and a command PC to be connected to Ethernet.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1991년도 추계학술대회 논문집
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• pp.191-193
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• 1991

This paper is described about the on-line, real-time quality information management system as the infrastructure of CIM, which we developed for the full automatic washing machine assembly line. This System is composed of Ethernet LAN, RS-485 Network, POP terminal, BAR CODE Scanner, PLC, ROBOT, measuring equipments and real-time processing software. We will run this system from next month regularly.