• Proceedings of the KIEE Conference
• /
• 2011.07a
• /
• pp.1746-1747
• /
• 2011

BACnet(Building Automation and Control Network)은 빌딩 자동제어 시스템을 위해 개발된 데이터 통신 프로토콜로 ISO에 의해 국제 표준규격으로 제정되었으며, 지난 20여 년간 미국과 유럽을 중심으로 연구 및 개발이 활발히 진행되고 있다. 그러나 국내의 경우 아직까지 개발사례 및 연구활동이 미비한 실정이다. 이에 본 연구에서는 BACnet MS/TP 프로토콜 기반 네트워크 시스템의 실험적 성능해석을 위한 네트워크 모니터링 시스템의 개발 사례를 소개함으로써 BACnet의 국내 기술보급 및 기술확산에 기여하고자 한다.

• Proceedings of the Korean Information Science Society Conference
• /
• 2002.04a
• /
• pp.175-177
• /
• 2002

Ethernet PON(Passive Optical Network)의 핵심 기술 충의 하나인 MAC(Media Access Control) 프로토콜은 ONU(Optical Network Unit)들이 상향으로 트래픽을 전송할 때 공유되어 있는 링크상의 충돌을 방지하고, 효율적인 대역폭을 할당하기 위만 스케줄링 알고리즘을 포함하고 있다. 본 논문에서는 차세대 가입자 망인 Ethernet PON의 성능을 최대화하기 위해, 가입자 망의 특성을 고려만 동적 슬롯 할당 TDHA(Time Division Multiple Access) 방식의 MAC 프로토콜을 제안한단. 이를 검증하기 위하여 OPNET 시뮬레이션 도구를 이용해 Ethernet PON 모델을 설계하고 시뮬레이션 한다.

• Proceedings of the Korean Information Science Society Conference
• /
• 2004.04a
• /
• pp.190-192
• /
• 2004

본 논문은 리눅스 기반의 저장장치 시스템인 NAS (Network Attached Storage)의 기능을 향상시키기 위해 NDMP (Network Data Management Protocol)를 지원하는 NDMPv3 서버모듈을 개발하고 이를 NAS에 탑재한 시스템 구성에 관한 연구이다. 본 논문에서 개발한 NDMPv3 서버모듈은 NDMP 버전 3 표준 SDK(Software Development Kit)를 기반으로 개발되었으며 NDMP 버전 2와의 호환이 가능하도록 개발하였다. 본 논문에서 제시한 결과물은 표준 NDMP Control을 이용하여 NDMPv3 서버모듈을 통해 저장장치에서 테이프 드라이브로 백업/복구를 수행 할 수 있는 상태이다.

• Proceedings of the KIEE Conference
• /
• 2001.07b
• /
• pp.1266-1268
• /
• 2001

ProfiBus provides real-time data communication among field devices in the EMU (Electrical Multiple Unit) and TCMS (Train Control Monitoring System). This paper presents an adapt to Train Communication Network for EMU using ProfiBus DP(Decentralized Periphery) mathod, which is the layer 2 DDLM(Direct Data Link Mapper) protocol of ProfiBus.

• 제어로봇시스템학회:학술대회논문집
• /
• 1990.10a
• /
• pp.755-760
• /
• 1990

In this paper, the Mini-MAP network interface units are implemented for the IBM PC, general purpose, PLC, and robot respectively. The token bus controller, MC68824 is used to realize the IEEE 802.4. A protocol for the message exchanges between some automated devices called MMS is implemented where 76 services of total 86 MMS services are included.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2008.05a
• /
• pp.51-54
• /
• 2008

PON(Passive Optical Network) is the promising technology applicable to TPS(Triple Play Service). To improve process the packet, MAC(Multiple Access Control) is the most important technology in the PON. The core of MAC is DBA(Dynamic Bandwidth Assignment), it classifies SR-DBA(Status Report DBA) and NSR-DBA(Non Status Report DBA). But GPON DBA is using BPON's DBA, so it's bad in network efficiency. This study develop BR(Borrow-Refund)-DBA for improve network efficiency and prompt process. For take the gauge of performance evaluation, estimate about throughput, fairness and queue delay in SR-DBA and NSR-DBA environment

• Journal of Korea Multimedia Society
• /
• v.12 no.3
• /
• pp.436-444
• /
• 2009

As the interest in sensor networks has been increased recently, researches have been performed in many areas using sensor networks. In this paper, we propose and implement a lecture room control system based on a sensor network. It is possible to give an efficient lecture by collecting lecturers' lecture history information through the sensor network and controlling a PC, a beam projector, lights, etc. in a lecture room appropriately using the information. We construct a sensor network and perform experiments so that the proposed lecture room control system performs efficiently. Through the experiments, we obtained the optimal message generation period of the sensor node in a lecture room and the optimal number of sensor nodes deployed in a lecture room to communicate without any trouble between sensor nodes.

• IEMEK Journal of Embedded Systems and Applications
• /
• v.15 no.2
• /
• pp.79-85
• /
• 2020

IIoT stands for Industrial Internet of Things used in manufacturing, healthcare, and transportation in networked smart factories. Recently, IIoT's environment requires an automated control system through intelligent cognition to improve efficiency. In particular, IIoT can be applied to automatic calibration of production equipment for improved management in industrial environments. Such automation systems require a wireless network for transmitting industrial data. Self-calibration systems in laser transmission paths using wireless networks can save resources and improve production quality by real-time monitoring and remote control of laser transmission path. In this paper, we propose a wireless networked system for self-calibration of laser equipment that requires a laser transmission path, and we show the results of the prototype evaluation. The self-calibration system of laser equipment measures the coordinates of the laser points with sensors and sends them to the host using the proposed application protocol. We propose a wireless network service for the wired motor controller to align the laser coordinates. Using this wireless network, the host controls the motor by sending a control command of the motor controller in an HTTP message based on the received coordinate values. Finally, we build a prototype system of the proposed design to verify the detection performance and analyze the network performance.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• v.9 no.2
• /
• pp.833-836
• /
• 2005

Compared to corporation and government networks, home devices and services connected in a home networks has security threats because of the use of various wired and wireless network, middleware and protocol in digital home environment, a restricted system resource of home information appliances and the users who do not care about security. So security is critical element to provide secure services in a home network environments. In this paper we design the access control system based on RBAC to offer secure home network services.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.12 no.6
• /
• pp.1022-1025
• /
• 2008

Session Initiation Protocol (SIP) has become the call control protocol of choice for Voice over IP (VoIP) networks because of its open and extensible nature. However, the integrity of call signaling between sites is of utmost importance, and SIP is vulnerable to attackers when left unprotected. Currently a herby-hop security model is prevalent, wherein intermediaries forward a request towards the destination user agent sewer (UAS) without a user agent client (UAC) knowing whether or not the intermediary behaved in a trusted manner. This paper presents an integrated security model for SIP-based VoIP network by combining hop-by-hop security and end-to-end security.