• Proceedings of the Korean Information Science Society Conference
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• 2005.07a
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• pp.541-543
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• 2005

본 논문에서는 Ad Hoc 네트워크와 Ad Hoc 라우팅 프로토콜 중에 대표적인 On-demand 방식인 AODV(Ad Hoc On-demand Distance Vector) 라우팅 프로토콜에 대해 알아본다. 본 연구의 목표는 멀티미디어 데이터를 위한 QoS를 지원하는 새로운 라우팅 알고리즘을 제안하고, 네트워크 시뮬레이터에 구현하여 다양한 실험환경에서 제안한 라우팅 알고리즘에 대한 성능평가를 수행하는 것이다.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10a
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• pp.631-633
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• 2004

본 논문은 유비쿼터스 환경에서 리소스가 제한적인 이동통신 단말기 등에서 하위 네트워크 프로토콜이나 전송방식에 독립적인 서비스 발견을 위한 프레임웍을 설계하는데 있다. 이 연구의 접근은 Jini라는 서비스 프레임웍을 모바일 디바이스에 맞게 경량화하고 이 프레임웍에 다양한 Ad-hoc 전송 계층을 추가할 수 있도록 확장 가능한 Jini 서비스 프레임웍 제공함으로써 기존에 서비스가 가지던 네트워크 전송계층의 의존성을 극복하고자 하였다. 이를 위해 본 논문에서는 Bluetooth 전송기술을 하나의 Ad-hoc 네트워크 모델로 삼아 Jini 프레임웍 내에서 STL(Service Translation Layer)를 추가함으로써 Jini를 통한 Ad-hoc 네트워크에서 서비스 발견을 가능토록 하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10a
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• pp.436-438
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• 2004

이동 ad-hoc 네트워크(mobile ad-hoc network : MANET)는 유선 기반 망 흑은 액세스 포인트 없이 이동 단말기들로 구성된 망이다. 기존의 기반망을 사용하지 않으므로 유선 기반망이 구축되어 있지 않은 곳이나 유선 기반망이 파괴된 지역에 사용한다. 그러나 HANET에서는 노출된 매체와 동적인 토폴로지, 중앙의 감시와 관리 결여, 자원의 제약성 등과 같은 이유로 인해 유선망보다 더욱 않은 보안 문제가 발생한다. 본 논문에서는 이동 ad hoc 네트워크에서 노드의 신분 보장을 제공하기 위하여 기밀성에 중점을 둔 공개키 기반 구조에서의 노드 간 인증 기법을 제안한다.

• Journal of Satellite, Information and Communications
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• v.6 no.1
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• pp.75-79
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• 2011

Wireless devices can communicate between each other without existing infrastructure in mobile Ad-hod network. Ad hoc networks can be used under difficult conditions, where it is difficult to construct infrastructures, such as shadowing areas, disaster areas, war area, and so on. In order to support to considerable and various wireless services, more spectrum resources are needed. However, efficient utilization of the frequency resource is difficult because of spectrum scarcity and the conventional frequency regulation. Ad-hoc networks employing cognitive radio (CR) system that guarantee high spectrum utilization provide effective way to increase the network capacity. In this paper, we simulate and compare the performance of conventional single and cooperative spectrum sensing with CR system using ad-hoc networks in additive white Gaussian noise (AWGN) and Rayleigh channel model. And we demonstrate performance improvement by analyzing the system performance.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.30 no.8A
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• pp.639-648
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• 2005

A wireless ad-hoc network is a temporal network formed by a collection of wireless mobile nodes without the aid of any existing network infrastructure or centralized ad-ministration. Numerous routing protocols have been developed for changing messages among the nodes in a wireless ad-hoc network. Some multi-path routing protocols have also been proposed to support load balancing and QoS for wireless ad-hoc networks. In this paper, we propose not only an efficient routing algorithm for wireless ad-hoc net-worts but also a protocol that can improve data transmission rate and reduce end-to-end delay. In our protocol, each mobile node need not broadcast routing messages periodically and the mobile node that wants to send data packets initiates route request and route establishment procedure. By simulation, we showed that faster route recovery is possible by maintaining multiple routing paths in each node, and the route maintenance overhead can be reduced by limiting the number of multiple routing paths.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.8 no.5
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• pp.121-127
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• 2009

Wireless devices can communicate between each other without existing infrastructure in mobile Ad-hod network. Ad hoc networks can be used under difficult conditions, where it is difficult to construct infrastructures, such as shadowing areas, disaster areas, war area, and so on. In order to support to considerable and various wireless services, more spectrum resources are needed. However, efficient utilization of the frequency resource is difficult because of spectrum scarcity and the conventional frequency regulation. Ad-hoc networks employing cognitive radio (CR) system that guarantee high spectrum utilization provide effective way to increase the network capacity. In this paper, we simulate and compare the performance of conventional single and cooperative spectrum sensing with CR system using ad-hoc networks. And we demonstrate performance improvement by analyzing the system performance.

• 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.

• Journal of Korea Society of Industrial Information Systems
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• v.10 no.3
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• pp.30-37
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• 2005

Ad hoc network is a collection of mobile nodes without using any infrastructure, it , is using in the various fields. Because ad hoc network is vulnerable to attacks such as routing disruption and resource consumption, it is in need of routing protocol security. In this paper, we propose two secure route-discovery protocols. One is a protocol using hash function. This protocol is weak in active attack but has some merits such as small data of transmission packet and small computation at each hop. The other is a protocol using hash function and public key cryptography. This protocol is strong in active attack.

• The Journal of the Korea Contents Association
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• v.9 no.8
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• pp.84-90
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• 2009

In this paper, the RFID-based ad-hoc network is presented for the efficient yard management of the container terminal. The loading and unloading work is performed through the ad-hoc communication between YT and GC, YT and TC within the yard without the control of the central server. That makes the efficient operation of the yard with real task correspondence. Using the location information of the RFID tag, we have proposed the routing protocol which is suitable for the yard environment of the container terminal. The performance evaluation has been carried out through the network simulator and gained an effective results.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.05a
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• pp.601-603
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• 2013

The nodes of Ad-hoc network are made up of location registration for sending informations 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 extent of the traffic in order to control the traffics of the multi-hop in Ad-hoc.