• Proceedings of the KAIS Fall Conference
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• 2007.05a
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• pp.203-207
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• 2007

NEMO 기본 지원 (NEMO-BS, NEMO Basic Support) 프로토콜에서 MNN(Mobile Network Node)가 CN(Correspondent Node) 과 통신을 하기 위해서는 항상 MR(Mobile Router)과 HA(Home Agent) 사이의 양방향 터널을 이용해야 한다. 그러나 NEMO-BS 방식은 노드 간 데이터 전송 지연과 부분 구간에 대한 공격 가능성이 존재한다. 따라서 본 논문에서는 NEMO를 위한 인증된 경로 최적화(ATRO) 프로토콜을 제안한다. MR은 홈 링크로부터 멀어졌다고 판단되면 MNN으로부터 위임 권한을 얻기 위해 권한 위임 프로토콜을 수행한다. 그런 후에 MR과 CN은 공개키 암호 방식을 이용하여 자신의 의탁주소(CoA, Care-of Address)를 MNN의 홈 주소(HoA, Home-of Address)와 매핑하기 위한 등록 과정을 수행한다. 이때 각 노드의 주소 소유권 증명을 위해 암호학적으로 생성한 주소(CGA, Cryptographically Generated Address)를 이용한다. 성능분석에서는 구간별 안전성과 종단간 패킷 전송 지연 시간을 통해 프로토콜을 분석한다.

• Journal of the Economic Geographical Society of Korea
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• v.11 no.3
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• pp.389-411
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• 2008

This paper have examined how industrial restructuring had been undertaken in response to economic crises in both Stuttgart, the hometown of the German automaker Daimler-Benz and Turin, that of the Italian automaker Fiat, in terms of changes in regional governances. Based upon this comparison, their micro dynamics have been examined that the transformation of automotive production systems from vertical integration to vertical disintegration had produced different regional development paths. It is argued that the recent transformation of auto production systems does not lead to a global convergence, but it reveals a local divergence based upon its locally embedded heritages, which is closely related to regional governances among the economic agents in question.

• Proceedings of the Korea Database Society Conference
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• 1997.10a
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• pp.393-404
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• 1997

1. HiWEB 서비스 $\textbullet$ 의의 HiWEB서비스는 95년도 공공DB개발사업의 일환으로 과거 텍스트 기반의 DB 에서 탈피하여 한국통신과 한국PC통신이 공동 개발한 국내최초의 멀티미디어 DB로서 그 의의를 가지고 있다. $\textbullet$ 접속경로 01410(01411)접속 1.HiTEL INFOSHOP $\longrightarrow$99. Web서비스 $\longrightarrow$l.HiWEB 인터넷 직접접속 http : //hiweb. kornet. nm. kr $\textbullet$ 구성 내용 NeoGate : 인터넷 홈쇼핑 서비스 WebTheater: 연극/영화/비디오/음악 등 문화정보 서비스 WebCollege： 토익/생활영어 등 교육정보 서비스 대화방/게시판 등 각종 BBS기능 추가 개발중 2. 국내외 인터넷 쇼핑몰 현황 1) 해외 $\textbullet$ '97년 전자상거래 사업규모 80억 달러 추정(Forrester Research) -'96년 대비 10배 증가/2002년에 서비스의 총가치 3270억 달러 예상 $\textbullet$ Amazon(1 천 8백만 달러/96년), Cdnow(6백만달러/96년) 등이 유명 2) 국내 $\textbullet$ 인터파크, 인터넷백화점(롯데)을 선두로 우후죽순격으로 생겨난 인터넷 쇼핑몰간에 치열한 경쟁체제가 구축돼가는 전자상거래(인터넷홈쇼핑)의 초기단계이다.(중략)

• Proceedings of the KAIS Fall Conference
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• 2005.05a
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• pp.234-237
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• 2005

본 논문에서는 중첩된 이동네트워크(nested mobile network) 환경에서 멀티홈 기능을 지원하도록 구현한 내용을 기술한다. 멀티 흠 환경에서 이동 노드는 중첩도가 낮은 이동 네트워크를 우선적으로 선택하도록 설계 구현하였다. 구현된 중첩 이동 네트워크 시스템은 계층적 프리픽스 위임 기법에 기반한 경로 최적화(Hierarchical Prefix Delegation)를 지원하고 있다. 구현된 시스템을 테스트한 결과 이동 노드 이동 라우터, 흠 에이전트 등이 기대한 대로 동작함을 확인하였는데, 특히 멀티 흠 환경에 접속된 모바일 노드는 중첩도가 낮은 이동라우터를 성공적으로 선택하여 통신한다는 것을 확인할 수 있었다.

• Journal of KIISE:Information Networking
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• v.34 no.5
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• pp.348-359
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• 2007

The conventional mobile VPN services assumed the mobile communications occur between the MN in foreign networks and the CN in the home network. However, if a MN wants to communicate with another MN in a foreign network, it could degrade the performance of the mobile VPN service because of the triangular routing problem. In this paper, we propose a route optimization mechanism based on the mobile VPN using an x-HA allocated by diameter MIP in order to support the efficient communication between the mobile VPN users in foreign networks. The i-HA maintains the VPN-TIA as well as the x-HoA as the CoAs to solve the security problem and to provide an efficient route optimization simultaneously. Moreover, we proposed revised IPSec tunnel configuration to reduce the IPSec tunnel overheads at a MN when the MN communicates with several MNs in the foreign networks at the same time. The VPN server, a security management entity in the home network, notifies an additional IPSec tunnel establishment between the x-HAs where the communication peers are registered. The simulation result showed that the proposed scheme decreases the end-to-end packet delay time and improves the throughput after the handoff compared to the existing mechanism.

• Journal of KIISE:Information Networking
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• v.30 no.6
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• pp.677-684
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• 2003

IETF's Mobile IP protocol allows Mobile Node(MN) to keep connection to Correspondent Node(CN) no matter what the MN changes its point of attachment to the Internet. However, the protocol incurs triangle routing problem, because all packets for the MN are routed through its Home Agent(HA). Route optimization mechanism is proposed by IETF in order to resolve triangle routing problem, but it requires that any node in the Internet should also implement route optimization mechanism. In this paper, we propose a new route optimization algorithm. With the algorithm, routers between HA and CN are considered as Intermediate Agent(IA), and packets transmitted by CN are not forwarded to HA but intercepted by IA and tunneled to MN directly.

• Journal of the Korea Society of Computer and Information
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• v.14 no.5
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• pp.119-131
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• 2009

Existing proposals on route optimization for nested Network Mobility(NEMO) have a problem that it is difficult to optimize a route promptly in an environment where a MR moves frequently. Also, they have L3 handoff latency as well as route optimization latency until an optimized route is formed. In this paper, we propose a L3 handoff scheme that supports fast route optimization for nested NEMO without any additional optimization procedure. To achieve this, our proposed scheme is designed to include a procedure that an AR acquires address informations of a MR. After receiving binding update message from the MR, the AR performs the binding update procedure with the MR's HA on behalf of the MR. Packets are delivered to the AR only passing by the MR's HA after a bi-directional tunnel is formed between the AR and the HA. The result of our performance evaluation has shown that the proposed scheme could provide excellent performance compared with the RRH and the ONEMO.

• The Journal of the Korea Contents Association
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• v.8 no.9
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• pp.19-26
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• 2008

With the development of ubiquitous computing and the construction of infrastructure for one-to-one personalized services, the importance of context-aware services based on user's situation and environment is being spotlighted. The smart home technology connects real space and virtual space, and converts situations in reality into information in a virtual space, and provides user-oriented intelligent services using this information. In this paper, we proposed the discovery of the behavior sequence pattern using the mining in the smart home. We discovered the behavior sequence pattern by using mining to add time variation to the association rule between locations that occur in location transactions. We can predict the path or behavior of user according to the recognized time sequence and provide services accordingly. To evaluate the performance of behavior consequence pattern using mining, we conducted sample t-tests so as to verify usefulness. This evaluation found that the difference of satisfaction by service was statistically meaningful, and showed high satisfaction.

• Proceedings of the IEEK Conference
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• 2008.06a
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• pp.1057-1058
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• 2008

In this paper, the algorithm and the computer simulation of a effective homing navigation system are presented. it is a combination of Path integration by using population coding and neural network and simple avoidance obstacle algorithm. Also, through the computer simulation, we demonstrated the feasibility of the suggested method.

• Proceedings of the Korea Multimedia Society Conference
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• 2000.11a
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• pp.295-298
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• 2000

본 논문에서는 Mobile IP상에서 멀티캐스트를 지원하기 위하여 IETF 표준에 제시된 원격가입과 양방향과 터널링 기법의 단점을 보완하는 통합 모델을 제시한다. 제안된 모델의 특징은 이동호스트(MH)가 다른 네트워크로 이동할 경우 외부 에이전트(FA)의 멀티캐스트 그룹가입 여부에 따라서 홈 에이전트(HA)를 통한 양방향 터널링 또는 FA의 멀티캐스트 그룹에 재가입하는 방법을 이용한다. 이에 따라, 패킷의 손실을 최소화하면서 패킷에 대한 최적의 경로를 제공할 수 있도록 상황에 따라 두 방법이 상호보완적으로 동작하게 된다.