• Convergence Security Journal
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• v.14 no.7
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• pp.17-22
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• 2014

Wireless Ad hoc Network is threatened from many types of attacks because of its open structure, dynamic topology and the absence of infrastructure. Attacks by malicious nodes inside the network destroy communication path and discard packet. The damage is quite large and detecting attacks are difficult. In this paper, we proposed attack detection technique using secure authentication infrastructure for efficient detection and prevention of internal attack nodes. Cluster structure is used in the proposed method so that each nodes act as a certificate authority and the public key is issued in cluster head through trust evaluation of nodes. Symmetric Key is shared for integrity of data between the nodes and the structure which adds authentication message to the RREQ packet is used. ns-2 simulator is used to evaluate performance of proposed method and excellent performance can be performed through the experiment.

• Journal of KIISE:Information Networking
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• v.34 no.3
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• pp.218-225
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• 2007

As the research on home network technologies, sensor network technologies, and ubiquitous network technologies makes rapid progresses, wireless ad-hoc network have attracted a lot of attention. A wireless mobile ad-hoc network is a temporary network formed by a collection of wireless mobile nodes without the aid of any existing network infrastructure or centralized administration, and it is suitable for ubiquitous computing environments. In this paper, we suggest an extension scheme of a wireless mobile ad-hoc network based on limited multiple paths source routing protocol. This scheme reduces the overhead of route re-establishment and re-registration by maintaining link/node non-disjoint multiple paths between mobile hosts in a wireless mobile ad-hoc network or a mobile host in a wireless mobile ad-hoc network and a base station supporting fixed network services. By maintaining multiple paths, our scheme provides short end-to-end delay and is reliable extension scheme of a wireless mobile ad-hoc network to a fixed network. In this paper, our simulations show that our scheme outperforms existing schemes with regards to throughput and end-to-end delay. Also we show that our scheme outperforms multi-paths approach using disjoint routes with regards to routing overhead.

• Convergence Security Journal
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• v.11 no.1
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• pp.11-18
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• 2011

Wireless mesh network technology with transmission speeds similar to wired and wireless technology means to build, compared with wired networks, building a more efficient network to provide convenience and flexibility. The wireless mesh network router nodes in the energy impact of the mobility is less constrained and has fewer features entail. However, the characteristics of various kinds due to network configuration settings and the choice of multiple paths that can occur when the system overhead and there are many details that must be considered. Therefore, according to the characteristics of these network routing technology that is reflected in the design and optimization of the network is worth noting. In this paper, a multi-path setting can be raised in order to respond effectively to the problem of the router node data loss and bandwidth according to traffic conditions and links to elements of the hop count evaluation by using a genetic algorithm as a workaround for dynamic routing the routing metric for wireless mesh network scheme is proposed.

• The KIPS Transactions:PartC
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• v.12C no.7 s.103
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• pp.1031-1038
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• 2005

As the research on home network technologies, sensor network technologies, and ubiquitous network technologies makes rapid progresses, wireless ad-hoc network have attracted a lot of attention. A wireless ad-hoc network is a temporary network formed by a collection of wireless mobile nodes without the aid of my existing network infrastructure or centralized administration, and it is suitable for ubiquitous computing environments. In this paper, we suggest an interconnection scheme between the wireless ad-hoc network environment based on multiple path source routing protocol and a Mobile-IP based network environment. This scheme reduces the overhead of route re-establishment and re-registration by maintaining multiple paths between the mobile host in wireless ad-hoc network and the base station in mobile-IP network. Also it puts the base station in charge of function that performs translation between wireless ad-hoc network packets and Mobile-IP packets, reducing the load of mobile hosts. In this paper, our simulations show that our scheme outperforms existing interconnecting schemes with regards to throughput and end-to-end delay Also we show that our scheme outperforms multi-paths approach using disjoint routes with regards to routing overhead.

• The Journal of the Korea Contents Association
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• v.8 no.9
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• pp.34-41
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• 2008

Existing mobility support scheme like MIPv4 has the delay at data transfer and Triangle routing problem. This paper proposes the new mobility support scheme and method that can overcome the problem using MPLS LSP in Next Generation Network. The proposed scheme overcomes the problem by introducing the LMS(Location Management Server) managing the location of the mobile terminal and the MPLS LSP between FA for a tunneling. We shows on the mathematical analysis using the queuing theory that this proposed scheme is more superior to the existing method(MIP).

• The Journal of Engineering Research
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• v.7 no.1
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• pp.53-60
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• 2005

Community Wireless Networks define the next generation wireless services. Multimedia usages for financial services over community Wireless LAN (WLAN) based mesh networks require link stability. Several new services are being proposed for multimedia over WLANs. Portable Internet Services are implemented by several wireless carriers to proliferate their customer base. However, these services are still expensive and require a central telecom/wireless carrier whose monopoly and preference defines the availability of new services. Our research project identifies the usage of these critical services in public places over the financial services backbone architecture to provide efficient easy-to-use and economical services to their customers and merchants without being dependent on the central wireless carrier. The user connects to the network using his regular WLAN NIC using the Mesh Router/Bridge interconnectivity and obtains the needed multimedia and financial services from the ATM-AP Gateway, In our proposed scenario, the ATN AP-MR use AODV protocol and MR-MC is based on 802.11g/a/b IEEE standard. We use multi path routing protocols for reducing the congestion over a particular route. We demonstrate the results of our simulations and test-bed outcome to evaluate link failure rate and oversubscription factors to eliminate network congestion and non-availability of the critical financial services.

• Proceedings of the Korea Contents Association Conference
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• 2015.05a
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• pp.31-32
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• 2015

본 논문에서는 컴퓨터 망에서 동적라우팅 프로토콜로 다중영역을 지원하는 OSPF (Open Shortest Path First)를 중심으로 망 축약(summary), 타 프로톨과의 연동을 위한 재분배(redistribution), Virtual Link 등 복잡한 설정 기법을 연구하고 이를 신라대학교 LAN 구성에 적용한다. 시스코의 망 시뮬레이터 장비인 패킷트레이서를 활용하여 라우터와 스위치는 각각 2620XM Router, 2950T-24 Switch를 사용하고, 라우팅 프로토콜은 OSPF, EIGRP(Enhanced Interior Gateway Routing Protocol)를, 또한 이들 간의 연결을 위해서는 재분배를 이용하고, 다중 영역 중 백본 area에 인접하지 않는 area에 대한 연결을 위해서는 Virtual Link 등 여러 설정 기법을 사용한다. 전체 망 구성 연결 후에는 이들 설정에 대한 통신상태를 확인한다.

• 한국IT서비스학회:학술대회논문집
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• 2010.05a
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• pp.207-210
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• 2010

무선 센서 네트워크 시스템을 이용한 많은 응용 시스템이 연구되고 있는 가운데, 최근 무선 센서 네트워크 시스템의 신뢰성 확보에 대한 문제점이 대두되었다. 이러한 문제점을 해결하기 위하여 영상 데이터를 전송함으로써 보다 신뢰성 있는 정보를 제공할 수 있는 멀티미디어 센서 네트워크에 대한 연구가 활발히 진행되고 있다. 그러나 영상 데이터를 저속의 멀티 홉 무선 센서 네트워크 환경에서 효율적으로 전송하는 프로토콜에 관련된 연구는 비교적 많지 않다. 지금까지의 통신 프로토콜들은 비교적 단순한 센싱 데이터를 전송할 수 있도록 설계되었으며, 새로운 응용들을 지원하기 위해서는 새로운 통신 프로토콜이 필요하다. 따라서 본 논문에서는 연속적인 영상 데이터를 멀티 홉 환경에서 효율적으로 전송할 수 있는 다중 경로 간 간섭이 없는 간섭 회피 다중 경로 설정 기법을 제안한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2013.11a
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• pp.314-317
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• 2013

본 논문에서는 수시로 차량이 빠르게 이동하고 차량 밀도가 변화하는 그리드 형태의 도로로 구성된 도심의 VANET 환경에서 패킷 전송 성공률을 높일 수 있는 다중경로 패킷전송기법을 제안하였다. 다중경로 패킷전송기법은 이웃노드 리스트의 정보를 이용하여 목적지까지 다중경로를 정한 후 도달가능성이 높은 순서대로 1개 이상의 다중경로로 패킷을 전송하는 방법이다. 다중경로가 발생할 가능성이 높은 그리드 형태의 도로환경에서 목적지까지의 거리 및 차량 밀도를 기반으로 다중경로를 선정하고 각 경로 별로 패킷 프레임에 선호경로 및 Trace 등의 정보를 추가하여 Local Maximum에 빠질 확률을 낮추고 경로 단절로 인한 경로 복구와 그에 따른 경로 중복 및 패킷 전송지연을 방지하여 패킷 단절률을 낮추고 패킷 전송 성공률을 향상 시킬 수 있다.

• Journal of the Korean Operations Research and Management Science Society
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• v.41 no.2
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• pp.53-65
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• 2016

Static wireless multi-hop networks, such as wireless mesh networks and wireless sensor networks have proliferated in recent years because of they are easy to deploy and have low installation cost. Two key measures are used to evaluate the performance of a multicast tree algorithm or protocol : end-to-end delay and the number of transmissions. End-to-end delay is the most important measure in terms of QoS because it affects the total throughput in wireless networks. Delay is similar to the hop count or path length from the source to each destination and is directly related to packet success ratio. In wireless networks, each node uses the air medium to transmit data, and thus, bandwidth consumption is related to the number of transmission nodes. A network has many transmitting nodes, which will cause many collisions and queues because of congestion. In this paper, we optimize two metrics through a guaranteed delay scheme. We provide an integer linear programming formulation to minimize the number of transmissions with a guaranteed hop count and preprocessing to solve the aforementioned problem. We extend this scheme not only with the guaranteed minimum hop count, but also with one or more guaranteed delay bounds to compromise two key metrics. We also provide an explanation of the proposed heuristic algorithm and show its performance and results.