• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.1
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• pp.65-73
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• 2006

Network based VPN(Virtual Private Network) using MPLS(Multiprotocol Label Switching) technology, called PE(Provider Edge router) based MPLS VPN, is regarded as a good solution for intranets or ext3nets because of the low cost and the flexibility of the service provision. In this paper, we describe a mechanism that allows the VPN users to move from one site to another site of the VPN network based on the BGP-E MPLS technology. This mechanism is designed for PE(Provider Edge) routers of the backbone network. PE routers connected to the VPN sites establish a new MPLS path to the mobile node after they detect movement of the mobile VPN node. The new location may belong to the same VPN or to different VPN. We desisted VPN management and control functions of the PE routers in order to interface with the Mobile IP protocol and support the QoS mechanism. The pilot implementation and performance measurement were carried out on a simulation using COVERS tool.

• The Journal of the Korea Contents Association
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• v.16 no.3
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• pp.296-304
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• 2016

Recently in domestic market, the telecommunication and appliance companies actively provide IoT home service through their dedicated smart device and communication network. But because their service should use only their own devices and be payed by monthly, it does not satisfy user's needs. So, users want device and service environment that can be easily configured according to user needs. Therefore, in this paper, we propose IoT home service environment architecture and ACOME(Auto-Configuration of MQTT and REST) mechanism. The proposed architecture consists of IoT platform and IoT home gateway. And the ACOME provides the automatic registration using DPWS function and interface construction using MQTT. This implements as a library for open-source hardware such as Arduino that is easy to get on the market. So the user easy to make own IoT device. Finally, we provide performance evaluation about service and device discovery between ACOME and DPWS.

• Electronics and Telecommunications Trends
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• v.8 no.2
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• pp.108-124
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• 1993

개방망은 망 접속을 표준화하여 망을 접근하도록 하는 technical interface의 공개측면과 망이 가지고 있는 망서비스를 공개하여 사용자로 하여금 선택적으로 이용할 수 있게 해주는 망서비스 공개 측면을 모두 고려하여 망구조를 실현해야 한다. 통신망은 망의 서비스 유형 및 일반적인 기능에 따라 음성급 전화망, 데이터망, 전용선망, 이동통신망 및 위성망으로 구분할 수 있으며, 이에 대한 망 접속은 각 망별로 또한 분류될 수 있다. 망서비스는 기술의 발전과 망진화에 따른 기술적인 요인, 고도통신 사업의 다양화에 다른 사업자 요구에 의한 요인, 그리고 시장수요 요인에 의해 계속 발전.진화되어지는 동적인 것이다. 개방망구조는 망서비스와 기술적인 접속을 주요 내용으로 하고 있기 때문에 이것도 역시 계속 진화되는 것으로 해석해야 한다. 본고에서는 개방망의 서비스 측면에서 해당교환 시스팀이나 전송시스팀이 제공가능한 서비스들로서 개방망구조의 서비스메뉴로 표현할 수 있는 것들을 각 망에 대해 자세히 파악하고자 한다. 이번 호에서는 그 첫번째 내용으로서 음성급 전화망에서 개방망서비스로서 국내 교환시스팀과 미국의 ONA 일환으로 BOC가 제공 가능한 것들을 소개한다. 음성급개방망서비스(Voice Grade Open Network Service)는 크게 가입자선측과 중계선측으로 분류 가능하다. 각 분류후에 1) 국내에서 제공가능한 서비스, 2) 여러 BOC가 공통적으로 보유한 서비스, 3) 특정 BOC가 보유한 서비스로 분류 정리하였다.

• Electronics and Telecommunications Trends
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• v.33 no.3
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• pp.1-10
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• 2018

This article presents spectrum sharing policy trends both overseas and domestically. The Federal Communications Commission recently adopted rules for the commercial use of a 150 MHz bandwidth at 3.55 to 3.7 GHz, which has been utilized for defense and satellite services. This frequency band for spectrum sharing is called the citizens broadband radio service (CBRS) band. In Europe, the related regimes for licensed shared access application at 2.3 to 2.4 GHz has been organized, and interface standardization for sharing frequency information has been completed. In Korea, efforts are being made to establish spectrum-sharing policies to improve the efficiency of the frequency utilization. This article also introduces both the IEEE 802 local area network/metropolitan area network and 3GPP standardization activities with regard to frequency sharing technologies. To effectively solve the spectrum-sharing problem in IEEE 802, standardization activities on the CBRS and the mid-band (3.7-24 GHz) are underway. 3GPP is currently developing the standardization of a licensed assisted access technology, which extends mobile communication services provided in the licensed band to unlicensed bands.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.59 no.9
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• pp.1549-1559
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• 2010

Modern power system is operated and managed in closed network environment with treating a great variety of data, and requirement of real time power system data is more increasing. However, it is difficult for operators to fast evaluate the condition of power system using only isolation network system such as SCADA or EMS regarding unexpecting situations occurring. Recent technology achievement in areas of distributed computing, networking high speed communications and digital control as well as the availability of accurate GPS time source are rapidly becoming the enabling factors for the development of a new generation of real time power grid monitoring tools. In this paper, architecture of WAMAC which is the wide area monitoring and control system not only to control but also to monitoring in real time is proposed and the plan of integration interface with legacy system such as EMS for providing power system analysis base data effectively is suggested.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.11
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• pp.2686-2692
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• 2013

In this paper, various growth environment data collecting and monitoring based on wireless sensor network for greenhouse environmental monitoring system is designed and implemented. In addition, greenhouse control system is proposed to integrated control and management in internal environment and greenhouse facilities. The system provides real-time remote greenhouse integrated management service which collects greenhouse environment information and controls greenhouse facilities based on wireless sensor network. Graphical user interface for an integrated management system is designed based on the HMI and the experimental results show that the sensor data were collected by integrated management in real-time.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.15 no.7
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• pp.602-617
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• 1990

In this paper, we analyze the performance of D-channel access protocol at the S-reference point for the ISDN user network interface recommended by CCITT. For the case of multipoint access to D-channel, a queueing model of D-channel access protocol is proposed. The delay is analyzed by decomposing it into waiting queue delay and contention delay. The contention delay is decomposed further into vain contention delay and pure contention delay so the analysis of the priority queueing system with symmetrical and asymmetrical arrival rates may be applied. The numerical results obtained are compared with the results of the single station queueing system served by the non-preemptive priority.

• The Journal of the Korea institute of electronic communication sciences
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• v.10 no.10
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• pp.1139-1144
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• 2015

The internet of things(: IoT) which could produce new information as well as service through connecting small devices with internet interface becomes reality and could be utilized in home, office and plant. Especially the IoT can provide our home for safety, security, convenience, and power saving since all devices form a small internet. This paper proposes an IoT prototype for home with Raspberry Pi which has various sensors and monitors environment. This Raspberry Pi sensor node is small and inexpensive but can provide powerful service. The implemented node goes beyond simple role of sensor node and features a kind of sensor web node which performs various functions to outer network. So the proposed IoT prototype can provide flexibility as well as extensibility since it does not need expensive server.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.49 no.1
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• pp.1-10
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• 2012

Mobility and quality of service (QoS) are becoming the more important issues in wireless communications. The traditional Internet service is expanding into new access media and applications. Since wireless communication services are accompanied by frequent handovers at remote sites, scalable and fast handover has become a prerequisite for ubiquitous communication. In this paper, the differentiated service (Diffserv) model is deployed in heterogeneous proxy mobile IPv6 (PMIPv6) networks to satisfy the QoS guaranteed service and fast handover requirements. The operational procedures for QoS guaranteed global roaming are presented. In addition, QoS management and handover cost evaluation schemes based on a mobile host's movement scope are proposed. This paper analyzes the reduction in handover delay in a network-based localized mobility management framework. We propose and analyze a PMIPv6 optimized with a global mobile access gateway (G-MAG), which is a network-based entity, to further improve the handover performance in terms of handover delay while maintaining minimal signaling overhead in the air interface among converged heterogeneous wireless networks. The handover signaling procedures with host-based MIPv6 are compared with network-based proxy MIPv6 (PMIPv6) and fast PMIPv6 assisted by G-MAG to show how much handover delay reduction can be achieved. Analytical results show that the handover delay is significantly reduced.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2002.11a
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• pp.131-134
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• 2002

네트워크의 급속한 발전과 더불어 컴퓨터 보급 확산을 통해 현대 사회는 정보화 사회로 한층 발돋움하고 있다. 이에 인터넷 환경의 급속한 확산과 개방성, 확장성으로 인한 해킹 등에 의해 정보의 유출, 변조, 도용 등의 보안상 문제점이 심각하게 대두되며, 네트워크를 공유함에 따라 자원의 독점이 불가능하게 되었다. 이로 인해 원하는 시간에 원하는 만큼의 정보를 전송할 수 있는 기능을 보장할 수 없게 되었으며, 네트워크 공유로 인한 속도 저하 등의 서비스 질(QoS: Quality of Service)이 불확실해진 것이다. 현재 TCP/IP 기술이 많은 네트워크 표준 기술로 사용되어 있으며, 이를 기반으로 인터넷에서 사설망의 기능을 제공하기 위해 도입된 기술이 VPN(Virtual Private Network)이다. 본 논문에서는 효율적인 VPN통신을 관리하기 위하여, Web Interface 지원으로 별도의 Management S/W를 설치할 필요가 없는 시스템을 구축하였고, 안정성, 보안성, 신뢰성 등 차별화된 서비스로 네트워크를 통합 관리하도록 하고 있다.