• Journal of the Korea Computer Industry Society
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• v.3 no.8
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• pp.1049-1062
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• 2002

As the distributed resources in the networks have become increasingly popular, the accesses to these resources having been activated. Especially, the accesses to the distributed resources using the mobile agent technologies provide the mechanisms supporting mobility with mobile users as well as the dynamic accesses to the resources in the fixed networks. Proxy-based mobile agent model is defined as mobile agent network model which allocates the hierarchical domains to the distributed resources changed dynamically, assigns one proxy server for each domain, and promotes the management and the cooperation of the mobile agents. In this paper, we introduce the architecture and the execution scenario for proxy-based mobile agent model which is suitable for the hierarchical management domains. In simulation, we evaluate the proxy server's route optimization functionality and the performance reducing execution time of the mobile agents.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06b
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• pp.98-100
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• 2012

본 논문에서는 차세대 전술이동통신체계에서의 무선 MSAP Mesh망에서 효율적으로 인증 키를 관리하고 전술이동통신체계의 부하를 줄이는 새로운 혼합형 인증기법을 제안한다. 기존 방식에서 각 MSAP이 체계 접속을 위해서는 중앙집중형 인증기법과 분산형 인증기법을 활용할 수 있는데 각각의 문제점을 안고 있다. 즉, 중앙집중형 인증기법은 MSAP 노드의 빈번한 가입 및 탈퇴로 인한 과다한 지연 문제가 있고 분산형 인증기법은 인증에 필요한 정보를 사전에 공유해야 하는 문제점이 있다. 이러한 문제점을 보완하는 동시에 전술적인 환경에서 악의적인 MSAP 접속 거부와 네트워크 보안성을 극대화하기 위해서는 보다 효과적인 인증기법이 요구된다. 따라서 본 논문에서는 미 인증된 MSAP이 EAP-TLS 기법을 기반으로 전술이동통신 네트워크 진입시 초기인증과 이웃 MSAP간의 상호인증 등 다양한 시나리오를 군의 특수한 환경에 맞추어 구체적으로 제시하고 각 인증 기법의 장 단점을 분석하여 혼합형 인증기법 적용에 타당성을 강조하였다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.27 no.2
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• pp.397-408
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• 2017

As mobile traffic increases rapidly, DMM (Distributed Mobility Management) has been proposed as a mobility management technology for seamless communication of mobile devices as mobile traffic increases rapidly. the DMM distributes mobility management from the core network to the edge network, enabling stable binding updates with low latency. However, the DMM still have network delay and security problems for sessions. In this paper, we point out the problems existing in the DMM and propose a new protocol in which the MN (Mobile Node) directly participates in authentication and mutual authentication is correctly performed to solve this problem. We demonstrate not only security improvements but also performance improvements with performance analysis.

• Information and Communications Magazine
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• v.32 no.3
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• pp.94-104
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• 2015

본 튜토리얼 논문에서는 최근 들어 다양한 형태의 스마트 기기 보급 확산으로 인한 모바일인터넷은 물론 사물인터넷 시대의 도래로 급격히 증가하는 인터넷 주소 수요로 인해 도입의 필요성이 대두되고 있으며 국내 외적으로 적용 확산을 위한 시도가 활발하게 진행되고 있는 IPv6(IP version 6)의 기본 개념과 관련 기술을 표준화 및 논문연구를 중심으로 알기 쉽게 이해시키고자 한다. 첫 번째로, 현재 사용되고 있는 인터넷 프로토콜 IPv4(IP version 4)와의 특징 비교와 주소 및 헤더를 통해 IPv6의 기본 개념을 자세하게 설명한다. 두 번째로, IPv4와 IPv6의 공존과정에서 IPv6의 연착륙을 위해 필요한 다양한 전환기술을 접근 방식과 세대별 분류를 통해 설명한다. 세번째로, 다양한 무선 환경에서의 이동단말의 연속적인 인터넷 서비스를 위한 IPv6 이동성 기술을 중앙 집중형 및 분산형 관리 기반으로 나누어 소개한다. 네 번째로, IPv6 보안측면에서의 이슈를 다루고, 다섯 번째로로, 4세대 이동통신망(4G) 대비 10~1,000배의 연결 디바이스를 고려하고 있는 5세대 이동통신망(5G) 네트워크 환경에서 중요한 서비스로 간주되고 있는 사물인터넷 서비스에서의 IPv6의 역할을 다룬다. 마지막으로, 국내외에서 진행된 대표적인 IPv6 상용서비스 사례를 제시한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.8B
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• pp.716-729
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• 2003

As the public Internet and private internet have grown from small networks into large infrastructures, the need to more systematically manage the large number of network components within these networks has grown more important as well. The rapid growth of network size has brought into question the salability of the existing centralized model, such as SNMP(Simple Network Management Protocol) and CMIP(Common Management Information Protocol). Thus, for efficient network management, researches about mobile agent have also been performed recently. This paper presents analytical models of centralized approach based on SNMP protocol, distributed approach based on mobile agent, and mixed mode to make up for shortcomings of SNMP and mobile agent. We compare the performance of these analytical models based on network management response time. Experiment results show that performance of mobile agent and the nixed mode is less sensitive to the delay in WAN network environment. However, SNMP is more efficient for the simple network environment like LAN. We also propose an adaptive network management algorithm in consideration of network t environment. delay, task, and the number of nodes based on the results of analytical models. The results show that the adaptive network management algorithm can reduce the network management response time by 10% compared with either mobile agent or mixed mode network management algorithm.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38B no.11
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• pp.879-894
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• 2013

Recently, due to a explosive growth in the mobile Internet traffic, the problem of excessive data traffic handling on core network and thus scalability problem have been magnified in 3GPP LTE/SAE networks. Current LTE/SAE network based on the central P-GW (PDN Gateway) used as mobility anchor cannot deal with such demand for exponentially increasing mobile Internet traffic. In this paper, we propose a new LTE/SAE network architecture supporting distributed P-GWs and corresponding distributed mobility management to solve these problems. For this, in addition to the deployment of such distributed P-GWs, we propose a dynamic and distributed mobility management by distributing MMEs (Mobility Management Entities) which dynamically manages the location information of a UE's PDN connection, and also propose a handover procedure of such PDN connections by using the proposed distributed P-GWs and MMEs. The performance of the proposed dynamic and distributed LTE/SAE network system is compared with the current LTE/SAE network system in terms of handover latency and network throughput.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39B no.1
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• pp.8-16
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• 2014

In this paper, we propose a fast and scalable flow mobility management scheme based on the flow-based stateful routing for the IP-based mobile networks. The proposed scheme employees the crossover flow routers as mobility anchors to perform the distributed flow-based mobility management of the moving terminals, while aims to reduce the long handoff delay and the processing overhead of the existing IP packet routing. We evaluated the performance of the proposed scheme and verified the superior performance of the proposed scheme by comparing with the results of IP-based mobility management schemes.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37C no.11
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• pp.1011-1019
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• 2012

This paper presents a novel hybrid authentication scheme in the next-generation Tactical Mobile Communication Systems(TMCS) with wireless MSAP mesh networks. The existing centralized and distributed authentication methods for security between MSAPs may have their pros and cons. The centralized authentication method induces overhead from frequent MSAP association which leads to long authentication delay. On the other hand, the distributed authentication method requires initial sharing of the authentication information. Therefore, a more efficient authentication scheme is needed to protect the network from malicious MSAPs and also maximize efficiency of the network security. The proposed scheme provides a hybrid method of efficiently managing the authentication keys in the wireless MSAP mesh network to reduce the induced authentication message exchange overhead. Also, as the authentication method between MSAP and TMFT is different, a method of utilizing the ACR for handling the EAP packets is proposed. In overall, the proposed scheme provides efficient mutual authentication between MSAPs especially for tactical environments and is analyzed through performance evaluation to prove its superiority.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.6C
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• pp.535-543
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• 2002

In order to overcome disadvantages of existing centralized network management systems that use simple objects, dynamic object platforms are proposed as alternative systems. So the distributed network management systems are implemented using various distributed platform such as CORBA and Java-RMI. Subsequently mobile agent-based platforms are proposed. The mobile agent-based platform can additionally provide flexibility and scalability to network management system that CORBA or Java-RMI based platforms do not support. In this paper, we address an architecture to solve the problem of the occurrence of additional traffic by using mobile agent and to save resources of network element. Our proposal in this paper is an efficient network management architecture using motile agents. And we make use of mobile agents for minimizing of traffic that can happen when mobile agents moves. Also we design agents using information architecture of TMN for efficient resource management of network element and improvement of operation performance.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10a
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• pp.372-376
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• 2006

본 논문에서는 홈 내에서 헬스케어 상황정보 서비스를 제공하기 위한 모바일 프락시에 대해 기술한다. 모바일 프락시는 헬스케어 홈 서비스의 목적에 따라 분산자원의 통합 및 맞춤형 관리모델인 분산객체그룹 프레임워크를 기반으로 한다. 모바일 프락시의 주요 기능은 이동성을 지원 및 멀티미디어 스트림 동기화 그리고 그룹통신 지원한다. 특히, 클라이언트의 가용환경에 따라 수행객체에 대한 이동성을 제공한다. 이를 기반으로 헬스케어 상황정보 서비스를 제공하기 위해 사용되는 상황정보는 거주자의 위치, 홈 내에 설치된 센서/기기로부터 수집된 위치, 건강 그리고 쾌적환경 정보를 포함한다. 또한 헬스케어 상황정보 서비스를 위한 응용객체, 자원들의 그룹관리 지원 DOGF를 기반으로 이동성 지원 컴포넌트인 모바일프락시는 거주자 위치이동에 따라 적합한 헬스케어 상황정보 서비스를 제공한다. 모바일프락시를 이용한 헬스케어 상황정보 서비스는 헬스케어 지원 음악치료, 원격상담 서비스와 처방 주의 및 스케줄 알림서비스를 구현했다. 끝으로 제안한 환경에서 거주자의 위치, 시간 및 상황인식에 따라 구현하여 수행한 헬스케어 상황정보 서비스 결과를 보였다.