• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 1999.11a
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• pp.438-442
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• 1999

More and more residential and mobile users are requiring access to the Internet. This paper presents an architecture of the network solution for cost-effective Internet/intranet access between users and Network Service Providers(NSPs). It also presents a functional architecture of Internet access router in the integrated access node system. The proposed Internet access router provides the functionality that users select any of a number of NSPs and mutiple user PPP calls are multiplexed over each secure tunnel between the Internet access router and NSP.

• Journal of the Optical Society of Korea
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• v.20 no.3
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• pp.335-342
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• 2016

We demonstrate an optical asynchronous transfer mode/wavelength division multiplexing (OATM/WDM) optical access network, using a router based on an optical header decoder to conduct next-generation communications. The router consists of a decoder or hardware analysis processing of the header bit and switches. The router in the OATM/WDM optical access network is a key technology by which to satisfy subscribers’ requests, including reliability, cost efficiency, high speed, large-capacity transmission, and elevated information security. In this study, we carry out experiments in which a header decoder delivers to 16 and 32 subscribers with a single wavelength in the router. These experiments confirm the decoder’s successful operation via hardware using 4 and 5 header bits. We propose that this system may significantly contribute toward the realization of an optical access network that provides high-quality service to subscribers of next-generation communications.

• Journal of the Korean Society for Railway
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• v.9 no.3 s.34
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• pp.313-318
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• 2006

In this paper, we propose an efficient Care of Address (CoA) configuration scheme for network mobility support in the railroad environment. Mobile routers in a train visit each access router in the fixed order. Such regular movement characteristic of a train enables a current subnet access router to inform the next subnet access router of the mobile routers' interface identifiers before the mobile routers move to the next subnet access router. So, the next subnet access router can make care of addresses for the mobile routers in advance. The numerical results show that the proposed scheme outperforms the stateless scheme with respect to CoA configuration time.

• The Journal of the Korea institute of electronic communication sciences
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• v.11 no.5
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• pp.491-498
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• 2016

An ACL(: Access List), a list that determines network access, is used for the security of the network. An ACL if applied to a interface of router can filter particular packets. Also it can block or allow the access of certain unauthorized IPs or ports, based on the source address, destination address, and TCP/UDP port. This paper presents a simulation case to verify the effect of a router-based network applying Standard ACL or Extended ACL. The network was created through designing topology and then making a common virtual network using a Packet Tracer.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.2
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• pp.82-85
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• 2005

In the MIPv6 network, when mobile nodes move into new newtwork, they need to find the new access router and points(AR/AP) for the newtwork. Unless they are not connected to authorized AR/APs, they can be exposed to a lot of attacks. In this paper we propose a protocol to authenticate AR/AR and MN each other. This protocol is based on the public key scheme which is used in the SEcure Neighbor Discovery(SEND) protocol.

• The Journal of the Korea institute of electronic communication sciences
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• v.11 no.10
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• pp.1003-1008
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• 2016

Recently hospitals have divided into many divisions, specialized the medical service, and shown organic cooperation, all to provide patients with various and high quality medical service. They have also showed improvement in information protection by introducing an information protection system to regulate the access to patients' medical and personal information. The purpose of this paper is to present a case study to implement of a limited hospital medical information system that can regulate the access to medical information. For this, a router-based virtual network applying an ACL(: Access Control List) to regulate access to information was made using a packet tracer.

• Journal of Digital Contents Society
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• v.18 no.5
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• pp.983-987
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• 2017

Multi-homing mobile router separates network for user connection and network for internet access using various interfaces for internet access. This paper proposes a load balancing metric in order that multi-network mobile router distributes its traffic to one of several heterogeneous network interfaces. To evaluate the performance of the load balancing metric, experiments on traffic balancing is performed on real commercial networks were used in Korea and Hong Kong.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04d
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• pp.337-339
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• 2003

NGN 시대가 될수록 이동성을 지원하면서 네트워크를 효율적으로 이용하는 기술이 요구된다. Mobile Ipv6은 이와 같은 요구조건을 만족시키는 좋을 방법이다. 본 논문에서는 이동호스트가 핸드오버를 수행할 때 발생하는 Triangle Routing 오버헤드를 감소시키는 핸드오버 프로토콜을 제안한다. 제안된 핸드 오버 프로토콜은 Previous Access Router(PAR)가 Binding Update(BU) 메시지를 전송하게 함으로써 PAR에서 New Access Router(NAR)로 포워딩되는 패킷의 개수를 감소시킨다. 제안된 핸드오버는 NS-2(network simulation)에서 시뮬레이션 되었고, 멀티미디어 데이터 통신에 사용되는 UDP를 이용하였다.

• Journal of KIISE:Information Networking
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• v.32 no.5
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• pp.603-614
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• 2005

The wireless LAN environment using Mobile IP is constructed and managed to be connected with Ethernet based wired networks. However, there have been many problems with wireless networks using Mobile IP. Some important facts on network performance have not been considered when introducing wireless LAN by Mobile IP to wired networks. In this paper, we suggest schemes which can solve problems on Handover latency caused by the asymmetrical connectivity of the Access Router at applying the HMIPv6 and on binding updates due to the MN frequent movement. Our proposed schemes can reduce network latency by using the HMIPv6 architecture with a virtual router layer, and reduce communication overhead by interchanging information of the MN movement between routers. Our schemes are expected to assist in constructing a more real and effective wireless LAN environment based on the HMIPv6 and FMIP.

• Journal of the Korean Society for Railway
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• v.10 no.6
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• pp.758-765
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• 2007

In this paper, we propose an efficient seamless handoff scheme to minimize packet loss and unnecessary packets on the Internet using the peculiar mobility characteristics of public vehicles such as trains. MR (Mobile Router) in a train visits each AR (Access Router) in the fixed order. As the MR detects reachability to the NAR (Next Access Router) on the new link, the PAR (Previous Access Router) can directly deliver packets from MR's HA (Home Agent) to the NAR according to the HML (Handoff Mobile router List). Then. the NAR buffers them until the MR finishes L3 (Layer 3) handoff procedure with the NAR. Therefore, our scheme can support a seamless handoff without the packet loss and unnecessary packets on the Internet. The result of our performance evaluation has shown that the proposed scheme could provide excellent performance, compared with the NEMO basic support protocol and the Bi-casting protocol.