Bidirectional Active Bus and its Applications in Fiber Networks
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Based on π couplers and optical amplifiers of two-way amplifications, we propose a Bidirectional Active Bus (BAB) structure for fiber networks which support two-way communications. The BAB structure at least saves half amount of bus fiber and optical amplifiers than the Dual Active Bus scheme [1, 2]. The structure applies to both single-optical-carrier and optical FDM/WDM fiber networks. In expanding/interconnecting fiber networks, the proposed BAB structure is free of Signal Circulation (SC) [3, 4] and Multipath Propagation (MP) [5] problems and independent of constellation of sub networks, and it uses less amount of fiber and optical filters than the MPL and SLB schemes [3, 4]. Star-BAB structure is suggested for large networks. The BAB structure has potential good survivability.Keywords:
Survivability
Survivability is the essential ability of a system to fulfill its mission, in a timely manner, in the presence of attacks, failures, or accidents. Survivability should be considered beyond security for information system, and quantitative analysis can assess system survivability accurately for improvement. The paper presents a new type of analysis method for computer system survivability which considers both exterior environment and interior components and their correlations. The method can describe the survivability more precisely and exactly. The paper also elaborates on the process of using this method to evaluate system survivability and its advantages.
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Considering vulnerable Integrative electronic information system (IEIS) operating under influence of external impacts and internal failures, the elements of IEIS work with different reliability and performance characteristics. In this paper we divided IEIS into basic element categories and element categories, which wok in multi-states. Basic element categories can meet its specified mission, which must be satisfied in survivability analysis. We define survivability as the performance of the basic element categories, and then get this performance using u-function to denote the survivability of IEIS, considering influence of external impacts and internal failures. The evaluation method is useful to combine the performance of the basic element categories and its survivability, and improve the survivability of the IEIS based on the basic elements in poor performance.
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Critical information system in Internet is in face of increasingly security problems. More attention has been focused on the survivability of information system, which is the capability of system to continue its mis- sion even in the presence of damage to the system. The authors first introduce the definition of survivability. According to four function properties of survivability, which are Resistance, Recognition, Recovery, and A- daption, the authors design a model of survivable system structure and then explain survivability requirement, survivability strategy in this model. Additionally, they provide possible technical solutions for the survivability of systems, categorized by different aspects of our survivability strategy.
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All information systems cannot be made secure and completely reliable especially when faced with major accidents, environmental disturbances, and deliberate information warfare attacks. From points of view of communication, this paper concentrates on using mathematical method to measure the survivability of an information system after a few communication links of this information system are destroyed by physical attacks. In addition to survivability of information system, survivability of components of information system, for example, survivability of one node, survivability between two nodes, survivability of information subsystem, survivability between two independent information subsystems, are also dealt with in this paper
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It is well known that high-intensity EMP destroys all kinds of network services physically.How to provide survivability strategies in modern EM wars was discussed and the ability of GMPLS survivability strategy and the that of other survivability strategies were compared.Finally,several survivability coordinated strategies were introduced and a design idea of a LSP dynamic provisioning schemes was proposed.
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Abstract : Land platforms are increasingly required to carry out a wide range of roles in support of very diverse operations ranging from high intensity conflict to Operations Other Than War (OOTW). The acceptance of casualties is low and reduction is a strategic political imperative. As a result, crew/platform survivability is important to mission effectiveness and success. Methods for achieving survivability need to be objectively assessed and prioritized to meet cost constraints. Integrated Survivability (IS) assessments and modelling are key capabilities to perform this task. The United States Army defines survivability traditionally as the capability of the system and crew to avoid or withstand a man-made hostile environment without suffering an abortive impairment of their ability to accomplish their designated missioni The Army uses a well defined and established process to assess SoS survivability with verified and validated analytical tools to optimize platform and system design for survivability. This paper will define the modelling tools and evaluation process for manned and unmanned ground vehicle systems to assess integrated design for survivability for ground vehicle platforms. However, the US Army has moved towards a System of Systems (SoS) engagement and protection requirements with the traditional definition of survivability inadequate to describe the collaborative aspect of deployed systems. Survivability is more accurately defined by four levels: mission survivability; functional survivability; platform survivability; and personnel survivability. Personnel survivability defines the integration of the survivability of the individual soldier and the how the system affects the soldier's survivability. Platform survivability is the ability of a platform to avoid or withstand a man-made hostile environment without suffering an abortive impairment of its ability to contribute to the collaborative accomplishment of the SoS designated mission.
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Research progress of network survivability during the last few years were briefly introduced, including definitions, methods, qualitative and quantitative survivability evaluation, etc. Technical measures of survivability including IOT were summarized. Cooperative survivability and further possible research problems were investigated. Based on the idea of machine learning, survivability information can be got from other systems, and were utilized by the local system to enhance local survivability in time. Some research aspects on cooperative network survivability were summarized. Peers in a system collaborate with each other, which can improve the survivability of the whole systems.
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Survivability is still an unsolved problem in the field of computer science. This paper surveys and discusses research results in recent years, including survivability definition, requirement and development of survivability system, survivability analysis, survivability enhancement and architecture. At the end, this paper points out the key problems of survivability research from view of theory and practice and our future works.
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Survivability
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The Survivability/Vulnerability Information Analysis Center (SURVIAC) is a Department of Defense Information Analysis Center serving the survivability community in the technical area of nonnuclear survivability and lethality. It was formed in December 1984 and merged the activities of two existing organizations—the Combat Data Information Center and the Aircraft Survivability Model Repository. SURVIAC maintains libraries, databases, and survivability models that are within its technical area. Services provided to the aircraft survivability community include responses to bibliographic and technical inquiries, copies of aircraft survivability models, and performance of special tasks. The SURVIAC resources available to assist the aircraft survivability community are described along with procedures for use of SURVIAC.
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