• The KIPS Transactions:PartA
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• v.10A no.5
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• pp.439-452
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• 2003

Mobile agent is one of the good technologies for overcoming network load and latency in distributed applications, and it may be a promising way of base technology of distributed applications because of its high adaptability for various network environments. In this paper, a mobile agent programming system, called HUMAN, is designed and implemented efficient use in various distributed applications based on mobile agents. HUMAN supports such high level utilities as file searhing, addressing by groups of nodes, storing path information, storing search information, and thus it gives us high easiness in agent-based programming. And it provides various itinerary modes and flexible reply modes for easy adaptation to given network environment. It also provides a management server for registering and active agents. Thus it can be efficiently applied for such varous distributed applications as searching distributed information, remote control, and file sharing in networks. A simple electronic commerce system is designed is designed and implemented as a HUMAN based illustrative application.

• Proceedings of the Korean Information Science Society Conference
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• 2002.04a
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• pp.643-645
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• 2002

이동 에이전트는 분산 응용에 있어서 네트워크의 부하와 대기시간을 줄일 수 있는 좋은 기술 중 하나이며, 다양한 네트워크 환경에 대한 유연성과 보안성 좋아 향후 기대되는 환산 응용 기반 기술이라 할 수 있다. 본 논문에서는, 이동 에이전트 기반의 다양한 분산 응용에 효율적으로 적용할 수 있는 이동 에이전트 플랫폼인 HUMAN이 설계 구현되었다. 이동 에이전트 플랫폼, HUMAN은 파일 탐색, 그룹 어드레싱, 다양한 여정 모드, 유연 응답 기능 등의 고급 유틸리티 등을 지원하고 있어, 에이전트 프로그래밍에 있어서 높은 수월성을 제공하고 있으며, 불법파일 탐색 등과 같은 분산 응용에 특히 유용할 수 있다. 또한 에이전트 등록, 해지 등을 위한 관리 서버 등을 제공하고 있어, peer-to-peer관련 분산 응용 시스템의 개발에도 용이하게 적용할 수 있다는 장점을 가지고 있다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.14 no.6
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• pp.75-84
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• 2014

In order to solve the problems such as overload, single point of failure, non-optimized data path, and network scalability in conventional central mobility management protocols, distributed mobility management schemes have been continually studied in and around the IETF. In this paper, a network-based partially-distributed mobility management mechanism, pDMMv6, is suggested and the performance comparison with traditional protocols such as PMIPv6 and MIPv6 is made through simulation under the various user traffic environment. The simulation results include UDP packet delivery ratio, end-to-end packet delay, binding delay for registration signaling, CPU utilization in each node, and response delays in several server-client TCP applications such as web browsing, e-mail, telnet remote login, FTP file up/down-load, and database access.

• The KIPS Transactions:PartC
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• v.10C no.6
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• pp.787-792
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• 2003

Telecommunication network are becomming bigger and more complex. Its difficult to manage efficiently the networks, because these networks usually have heterogeneous and inompatoble compinents. Nevertheless, current approaches to network management have focused on centralized managementstrategies based on client-server architecture. These approaches have resulted in much weakness in the real-time management, the service extensibility, and the network scalability. In thispaper, we applied the mobile agent technology to solve the above problems. Jave is a promising technology for developing mobile agent system. But, there are several problems like the service extensibility in using the Java. To solve these problems, a new approach using digital signature is suggested to authenticate mobile agent in network management environments. This approach can solve the conflict between security of the system and extensibility of the mobile code. Moreover, the system suggested in this paper show the decentralized and flexible network management solutions.

• Proceedings of the Korean Information Science Society Conference
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• 2000.10c
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• pp.266-268
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• 2000

이동 컴퓨팅 환경에서 이동호스트에게 멀티캐스팅을 지원하기 위하여 많은 연구들이 진행되어 왔다. 그 결과 여러 가지 프로토콜이 제안되었다. 대부분의 프로토콜은 멀티캐스팅을 관리하는 에이전트를 두고 이를 지원하는 방식을 취하고 있다. 그러나, 이러한 방식은 하나의 에이전트에 과부하가 발생할 수 있으며, 에이전트의 과부하를 분산시키고, 에이전트의 안정성을 높이는 방법을 제안하고자 한다. 본 논문에서는 에이전트의 과부하를 분산시키고, 에이전트의 안정성을 높이는 방법을 제안하고자 한다. 본문에서 제안하는 방식은 다중 에이전트를 통하여 단일 에이전트에 등록되는 이동노드의 수를 줄이고, 다른 에이전트의 이동노드 등록 정보를 주기적으로 저장하여 신뢰성을 높이고자 하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.426-429
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• 2015

최근 급격히 증가한 모바일 기기로 인하여 발생되는 데이터/제어 트래픽은 LTE/EPC 네트워크에서 중앙에 과다한 트래픽 수용문제가 중요 이슈로 부각되고 있다. 기존의 Centralized Mobility Management(CMM) 기반의 LTE/EPC 네트워크에서 Mobility Anchor 역할을 수행하는 Packet Data Network Gateway (P-GW)에서는 데이터 트래픽 과부하가 발생한다. 또한 Distributed Mobility Management (DMM) 기반의 LTE/EPC 네트워크에서 분산된 Mobility Anchor 역할을 수행하는 PDN Edge Gateway (P-EGW)에서는 제어 트래픽의 과부하가 발생한다. 본 논문에서는 이러한 문제를 해결하기 위하여 CMM 기반과 DMM 기반을 결합한 새로운 Software Defined Network (SDN) 기반의 LTE/EPC 네트워크 이동성 관리 기법을 제안한다. 이를 위하여, P-EGW를 네트워크 내에 분산 배치하고 중앙에 P-GW를 배치한다. SDN 컨트롤러는 EPC의 역할도 수행하며 UE의 이동성에 따라 적절한 CMM 기법과 DMM 기법을 이용하도록 하는 기법을 제안한다. 또한, 제안하는 새로운 LTE/EPC 네트워크 구조와 기존의 CMM기반의 LTE/EPC 네트워크 구조, DMM 기반의 LTE/EPC 네트워크 구조를 핸드오버 지연시간과 데이터 전송시간 측면에서 성능 비교 분석을 한다.

• Journal of KIISE:Information Networking
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• v.30 no.5
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• pp.614-620
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• 2003

As the proliferation of Internet, mobile agent related technologies are examined for possible growth and evolution. In information retrieval, network and distributed system management, and electronic commerce, mobile agent is more flexible than the traditional communication paradigm. Despite the performance benefits, mobile agent is not used widely in the market because it is very vulnerable to a variety of attacks. In many studies related the security vulnerability for a mobile agent, the high security causes the performance to degrade. In this paper, we propose and evaluate the efficient security model for mobile agent using TDGM(Trusted Domain & Guide Manager), which provides three kinds of services : the trusted domain management, the security service and the travel plan guide. The result clearly shows that this model provides high security and minimizes the performance degradation.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.12 no.1
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• pp.97-107
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• 2012

The Internet is becoming increasingly diverse and complex, the needs of user's convenience is also various and increased. The task forces have been working on how to design the future Internet in satisfaction of user's require and mobility management is one of the key issues to be considered. mobility management in the future Internet is still being designed in an "all-in-one" way where all management functions are tightly kept at a single location and this results in cost inefficiency that can be an obstruction to constructing flexible systems. In this paper, we propose a cost-effective function-distributed mobility management scheme that can enable more flexible future Internet construction. Furthermore, we show the effectiveness of our proposed system via a cost analysis and computer simulation with a random walk mobility model.

• 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.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.