• 한국산학기술학회논문지
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• 제10권6호
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• pp.1207-1213
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• 2009

본 논문에서는 다양한 네트워크의 통합관리를 위한 네트워크토폴로지를 설계하는 방법을 제안한다. 이를 위해 TMN-DCN 디바이스를 정의하고 이를 주요요소로 이용하기로 한다. 이 때 관리정보량이 주요변수가 된다. 또한 네트워크 관리특성의 주요요소로 떠오르는 네트워크 서바이벌특성이 포함되는 네트워크 토폴로지의 간단한 설계방법을 제안한다. 이들 방법은 링크비용을 최소로 하면서 전체 트래픽 량을 지원할 수 있다. 실제 설계 예를 통하여 그 결과를 확인한다. 설계방법이 간단하게 제안 되었지만 서바이벌 특성구현과 관리 네트워크설계에 관한 보편적으로 적용할 수 있는 최적의 설계알고리듬이 존재하지 않기에 본 논문에서 제안된 설계방법이 실제 관리망의 구축 시 활용될 수 있다.

• 정보처리학회논문지C
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• 제17C권1호
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• pp.119-128
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• 2010

지능형 선박(Smart Ship)에 탑재되는 정보화 장비의 종류와 수량이 증가하고 있는 최근 국내외 조선 산업계 동향에 따라, 이들 장비를 효율적으로 통합하고 제어할 수 있는 선박 백본 네트워크 개발의 필요성이 대두되고 있다. 선박 백본 네트워크는 자동화 및 무인화 특징을 가지는 지능형 선박에 구축된다는 점에서 고수준의 생존성을 요구한다. 따라서 본 논문에서는 이와 같은 네트워크 구축 환경의 특수성과 네트워크 생존성 요구 사항을 고려하여, 효율적인 선박 운용을 제공하는 고생존 선박 통신망(SAN : Ship Area Network)에 대한 연구를 수행하고자 한다. 이를 위해 지능형 선박의 정보화 장비를 포함한 모든 네트워크 노드들이 이중 경로를 통해 서로 연결된 이중화 네트워크 토폴로지를 설계하였다. 그리고 설계한 이중화 네트워크 토폴로지 환경에서 최소의 중복 전송을 통해 최대의 생존성 성능을 나타내는 효율적인 중복 전송 프로토콜을 설계하였다. 또한 본 논문에서 제안한 토폴로지 및 프로토콜이 적용된 새로운 선박 통신망의 성능을 그래프 이론, 확률 이론, 구현 명세, 시뮬레이션 등을 포함한 체계적이고 실증적인 분석을 통해 검증하였다.

• 한국군사과학기술학회지
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• 제15권6호
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• pp.770-778
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• 2012

In this paper, we propose a multi-path construction scheme to improve the survivability of a multicast session in military hybrid networks. A military hybrid network consists of a static backbone network and multiple mobile stub networks where some nodes are frequently susceptible to be disconnected due to link failure and node mobility. To improve the survivability of multicast sessions, we propose a construction scheme of ${\kappa}$ redundant multi-paths to each receiver. In order to take account of different characteristics of static and mobile networks, we propose quite different multi-path setup approaches for the backbone and stub networks, respectively, and combine them at the boundary point called gateway. We prove that our proposed scheme ensures that each receiver of a multicast session has ${\kappa}$ redundant paths to the common source. Through simulations, we evaluate the performance of the proposed schemes from three aspects : network survivability, recovery cost, and end-to-end delay.

• 한국시뮬레이션학회논문지
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• 제18권1호
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• pp.35-40
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• 2009

분산 네트워크의 사용이 증가함에 따라 분산 작업을 신뢰성 있게 수행하기 위한 연구가 중요한 이슈로 등장하고 있다. 분산 네트워크에서의 작업의 수행은 인터넷 상의 유효자원에서 수행되므로, 가용한 자원에까지 효율적으로 접근할 수 있는가와 수행된 결과가 안정적으로 요청자에게 전달되는 것은 중요한 문제이다. 그래서 본 논문에서는 작업의 수행을 요청하는 곳에서 실제 작업이 실행되는 위치의 자원까지 데이터를 안전하게 전송하기 위한 생존성 인자를 설정하고, 생존성 인자의 값에 따른 데이터 전송속도를 측정하기 위한 성능평가를 수행하였다. 또한 제시한 생존성 인자를 활용한 안전한 전송을 보장할 수 있는 전송 알고리즘을 제시하였다.

• 한국국방경영분석학회지
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• 제22권2호
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• pp.166-181
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• 1996

Aircraft survivability is determined by the susceptibility and the vulnerability. The aircraft susceptibility and vulnerability depend upon the hardware and software factors. Each of the hardware and software factors consisted of the qualitative and quantitative attributes varies according to the time of the mission. In order to establish the mathermatical model to analyze and evaluate the aircraft survivability, qualitative factors have to be transformed into quantitative factors. Even if many researches in the area of dynamic concept analysis and conversion of qualitative factors into the quantitative factors has been insufficient. This research enhances these insufficient area by developing a reliable aircarft survivability analysis method. The major areas of this research are as follows. First, a method for the conversion of the qualitative factors into the quantitative factors is developed by combining the Fuzzy Set Theory concept and the Delphi Technique. Second, by using the stochastic network diagram for the dynamic survivability analysis, the aircraft survivability and the probability of kill are calculated from the state probability for the situation during mission. The advantage of the analysis technique developed in this research includes ease of use and flexibility. In other words, in any given aircraft's mission execution under any variable probability density function, the developed computer program is able to analyze and evaluate the aircraft survivability.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제14권9호
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• pp.3639-3662
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• 2020

The network capability to accomplish its functions in a timely fashion under failures and attacks is known as survivability. Ad hoc routing protocols have been studied and extended to various domains, such as Intelligent Transport Systems (ITSs), Unmanned Aerial Vehicles (UAVs), underwater acoustic networks, and Internet of Things (IoT) focusing on different aspects, such as security, QoS, energy. The existing solutions proposed in this domain incur substantial overhead and eventually become burden on the network, especially when there are fewer attacks or no attack at all. There is a need that the effectiveness of these routing protocols be analyzed in the presence of Denial of Service (DoS) attacks without any intrusion detection or prevention system. This will enable us to establish and identify the inherently stable routing protocols that are capable to survive longer in the presence of these attacks. This work presents a DoS attack case study to perform theoretical analysis of survivability on node and network level in the presence of DoS attacks. We evaluate the performance of reactive and proactive routing protocols and analyse their survivability. For experimentation, we use NS-2 simulator without detection or prevention capabilities. Results show that proactive protocols perform better in terms of throughput, overhead and packet drop.

• Journal of Communications and Networks
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• 제16권5호
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• pp.534-547
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• 2014

Large-scale failures resulting from natural disasters or intentional attacks are now causing serious concerns for communication network infrastructure, as the impact of large-scale network connection disruptions may cause significant costs for service providers and subscribers. In this paper, we propose a new framework for the analysis and prevention of network service disruptions in large-scale failure scenarios. We build dynamic deterministic and probabilistic models to capture the impact of regional failures as they evolve with time. A probabilistic failure model is proposed based on wave energy behaviour. Then, we develop a novel approach for preventive protection of the network in such probabilistic large-scale failure scenarios. We show that our method significantly improves uninterrupted delivery of data in the network and reduces service disruption times in large-scale regional failure scenarios.

• 산업공학
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• 제9권3호
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• pp.72-80
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• 1996

As the fiber optic technology is rapidly being deployed in telecommunication networks, particular emphasis is placed on the survivability in designing networks. Most of the survivable network design models proposed to date have connectivity constraints, which cannot precisely define a network topology owing to the multiplicity of feasible ones. In this paper, we propose a k-link survivable network design model incorporating traffic-based survivability constraints which restrict the lost traffic due to a network failure under a prescribed level. Our model is shown to include the existing connectivity models as special cases. Then we present its integer programming formulation, analyze the structural properties, and develop a heuristic for obtaining low cost survivable networks.

• Current Optics and Photonics
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• 제1권4호
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• pp.315-324
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• 2017

In recent years, multicast services such as high-definition television (HDTV), video conferencing, interactive distance learning, and distributed games have increased exponentially, and wavelength-division multiplexing (WDM) networks are considered to be a promising technology due to their support for multicast applications. Multicast survivability in WDM networks has been the focus of extensive attention since a single-link failure in an optical network may result in a massive loss of data. But the improvement of network survivability increases energy consumption due to more resource allocation for protection. In this paper, an energy-efficient multicast algorithm (EEMA) is proposed to reduce energy consumption in WDM networks. Two cost functions are defined based on the link state to determine both working and protection paths for a multicast request in WDM networks. To increase the number of sleeping links, the link cost function of the working path aims to integrate new working path into the links with more working paths. Sleeping links indicate the links in sleep mode, which do not have any working path. To increase bandwidth utilization by sharing spare capacity, the cost function of the protection path is defined to use sleeping fibers for establishing new protection paths. Finally, the performance of the proposed algorithm is evaluated in terms of energy consumption, and also the blocking probability is evaluated under various traffic environments through OPNET. Simulation results show that our algorithm reduces energy consumption while maintaining the quality of service.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2018년도 추계학술대회
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• pp.467-469
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• 2018

전술 무선통신은 네트워크 토폴로지의 가변성과 열악한 통신 환경으로 인하여 채널 간섭 및 통신단절 등의 통신장애 문제들이 종종 발생한다. 따라서 열악한 전술 환경에서 발생하는 무선통신망의 통신장애 문제를 효과적으로 극복하고, 생존성을 향상 시키는 것은 매우 중요한 과제라 할 수 있다. 본 논문은 사용자의 개입 없이 통신 장애의 상황을 특정하여 구분 짓고 보다 효과적인 솔루션을 수행하기 위한 이동통신 장비의 자동 제어 방법론에 대하여 기술 하였다.