• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.1
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• pp.902-905
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• 2005

In this paper we challenge the mobile node Authentication using Java Card authentication protocol in Ad-hoc network environment. Ad-hoc network is a collection of wireless mobile nodes without the support of a stationary infrastructure. and DSR routing protocol, which is one of famous mobile ad-hoc rooting protocols, has the following network path problem. this paper is the security structure that defined in a mobile network and security and watches all kinds of password related technology related to the existing authentication system. It looks up weakness point on security with a problem on the design that uses Ad-hoc based structure and transmission hierarchical security back of a mobile network, and a server-client holds for user authentication of an application level all and all, and it provides one counterproposal. Java Card Authentication of mobile node can possibly be applied to the area of M-Commerce, Wireless Security, and Ubiquitous Computing and so on.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.05a
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• pp.213-217
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• 2003

An Ad-Hoc networks is a set of wireless mobile host which forms temporary networks without any concentrated controls or any helps of standard support services. Mobile host' routers are operated by their mobile hosts without fixed routers, therefore, the original routing protocol algorithm are not effective. There are two major Protocols in Ad-Hoc Network. A Table-Driven algorithm and an On-Demand, but the latter is presented more effective. We try to compare and analyze the performances of each protocol's host in this thesis.

• Proceedings of the Korean Information Science Society Conference
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• 2000.04a
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• pp.223-225
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• 2000

Mobile ad hoc network는 무선으로 연결된 호스트들이 쉽게 이동할 수 있는 망으로써, 미리 설치된 유선망을 이용하는 Cellular망과 달리 이동 호스트사이의 통신만으로 이루어진 망이다. 이 Mobile Ad Hoc Network에서는 각각의 노드들의 이동성이 높기 때문에 이 각각의 노드들의 라우팅 경로를 결정하는 것이 중요하다. 이에 따라 Ad Hoc Network를 위한 많은 라우팅 프로토콜이 이미 제안되었다. 본 논문은 Location 정보를 이용한 Location Aided Routing(LAR)에 고정 호스트(Post)가 존재할 경우 Mobile ad hoc network에서의 향상된 Routing 기법을 제안한다. Location Aided Routing은 일발 flooding 기법에 비하여 Request zone을 이용하여 제한된 영역에서 라우팅을 하기 때문에 성능이 향상되었다. 본 논문에서는 여기에 고정 호스트를 두어 더욱 제한된 영역에서 라우팅을 하기 때문에 기존의 라우팅에 비하여 성능이 향상되었다.

• The KIPS Transactions:PartC
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• v.8C no.4
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• pp.459-468
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• 2001

실제적인 이동 Ad Hoc 망에서는 단말의 비대칭성이나 무선환경 특성으로 인해 단방향 링크가 존재할 수 있다. 그러나 현재 Zone 라우팅 프로토콜이외의 기존의 이동 Ad Hoc 라우팅 프로토콜은 양방향 링크들만을 지원하도록 구현되어 있다. 따라서 본 논문에서는 가장 대표적인 라우팅 프로토콜인 DSR(Dynamic Source Routing) 프로토콜이 단방향 링크를 포함하는 이동 Ad Hoc 망에서 구동될 수 있도록 동적 소스 라우팅을 이용한 새로운 단방향 라우팅 프로토콜을 제안한다. 단방향 링크 상에서 효율적으로 구동하기 위해서 제안한 단방향 라우팅 프로토콜은 새로운 경로발견 및 경로유지 방법을 사용하였다. 성능평가를 위해서 미국 버클리 대학의 NS-2 시뮬레이터 프로그램에 제안한 내용을 코드로 삽입시켰으며, 성능평가 파라미터를 얻기 위해 카네기멜론 대학에서 제공한 이동 패턴파일과 연결 패턴파일을 조합하여 사용하였다. 성능평가 항목으로 데이터수신율 및 평균경로 설정시간을 고려하였으며, 제안된 3가지 경로설정 방식들에 대해 비교·평가하였다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.3B
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• pp.224-236
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• 2003

MANET(Mobile Ad hoc networks) is a mobile, multi-hop, and wireless network which is bandwidth constrained, energy constrained, resource constrained, autonomous, and self operating systems with dynamic topology. These constraints make the routing between communicating nodes in ad hoc networks difficult. In this paper we survey several routing protocol for mobile ad hoc networks. Especially, we focus on Zone Routing Protocol, hybrid routing framework suitable for a wide of mobile ad hoc networks and analyze performance of ZRP. In the case of ZRP protocol, it is essential that the use of optimal zone radius for efficient use. Otherwise it was proved through an simulation that performance of whole network is rapidly decrease with greatly increasing overhead of ZRP traffic that need for transmission of packet by IARP or IERP traffic. Also we suggest the process of finding QoS path that use in-band signal for QoS routing in ad hoc network. This method guarantees route that make real time multimedia service for QoS enabled path.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.10a
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• pp.607-608
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• 2017

이동 Ad-hoc 무선망은 고정 라우터나 호스트, 무선 기지국에 관계없이 순수하게 무선기반의 인프라 구조로 구성된 망이다. 기존의 무선망 인프라는 기반 구축 비용이 많이 들고 기반구조가 파괴되었을 때 서비스 제공이 불가능한 단점이 있다. Ad-hoc 무선망은 이러한 단점을 보안하기 위해 라우팅 알고리즘을 구현하여 기존의 통신망보다 Ad-hoc 무선망을 이용하면 지진으로 인한 유 무선망의 통화단절 등을 막을 수 있고, 이동전화 품질서비스, 저렴한 가격, 떨어져 있는 동일 사업장내에서 무료 통화가 가능하여 이동통신 사업자에게 통신료를 지불할 필요가 없다. 본고에서는 이를 실현화 시킬 수 있는 알고리즘 개발과 시험을 통한 결과를 제시하고자 한다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.10 no.5
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• pp.201-208
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• 2010

Mobile Ad Hoc Network(MANET) has highly dynamic topology, hence presents a great challenge on the network performance evaluation and network protocol design. We proposed total path break up time, $\sum_{i}T_i$, as a metric to measure the performance of the total system as well as an individual connection. In this paper, we evaluate and analyze the performance of three mobility models(Random Waypoint, Manhattan, Blocked Manhattan) by applying the total path break up metric, investigate why network parameters such as packet delivery ratio, end-to-end delay, etc. vary by mobility models. We also present analysis result how much AODV Buffer improve packet delivery ratio and increase the end-to-end delay in spite of the path break up.

• Journal of KIISE:Information Networking
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• v.28 no.3
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• pp.336-346
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• 2001

A wireless ad-hoc network is a temporal network formed by a collection of wireless mobile nodes without the aid of any existing network infrastnlcture or centralized administration. Currently, numerous routing protocols have been developed for changing messages between nodes in a wireless ad-hoc network. Applications of wireless ad-hoc network technology are various and proper routing protocol must be used according to application domain or network size. In a wireless ad-hoc network. some hosts want services from fixed networks. For supporting such services, it is necessary to interconnect wireless ad-hoc networks and fixed networks. The DSMIHDynamic Source Multipath Routing) protocol, proposed in this paper, focuses on supporting seamless communication services between the nodes within a wireless ad-hoc network and providing fixed networks to the mobile hosts in wireless an-hoc networks. In DSMR protocol, each node need not broadcast routing messages periodically. and mobile hosts that to send data packets initiate route request and route establishment procedure. By maintaining multiple paths in each node. faster route re-establishment is also possible in our scheme.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.40 no.6
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• pp.205-212
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• 2003

Because a wireless ad hoc network does not have fixed infrastructure, a call admission control approach researched in a wireless network is not feasible to this network. In this paper, we propose call admission control scheme to support this problem and the burst handoff traffic due to group mobility in a wireless ad hoc network. This scheme is an adaptive guard channel scheme which adapt the number of guard channels in each MBS(mobile base station) according to the current estimate of the potential handoff call rate derived from the number of ongoing calls within the coverage area of an MBS that initiate group handoff in a wireless ad hoc network. Our simulation studies are performed for comparisons of the proposed scheme with the other channel allocation schemes. Simulation results show that the proposed scheme efficiently reduces handoff call blocking probability in wireless ad hoc networks.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.9 no.1
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• pp.58-64
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• 2005

The nodes of Ad-hoc network are made up of location registration for sending information and a great number of packet transmissions to maintain routing route among the nodes. under this environment, a huge number of traffics would be generated as mobility variable occurs more than in physical network. Hence, in this paper, focused on to study the relationship of nodes to analyze the extend of the traffic in order to control the traffics of the multi-hop in Ad-hoc.