Моделі і методи оцінювання живучості розподілених інформаційних систем

Достоверность полученных результатов подтверждается: обоснованностью допущений, принимаемых при разработке структурных схем и аналитических моделей оценки живучести, исходя из опыта проектирования и эксплуатации РИС постоянной готовности и их элементов, а также данных производителей по отказам и поражаемости таких устройств и их элементной базы при ЭВ; сходимостью результатов экспериментальных исследований, результатов аналитического моделирования и теоретических результатов; результатами практического использования разработанных моделей и методов при проектировании и эксплуатации элементов и подсистем РИС военного применения.

Предложенные модели и метод реализованы в виде расчетных моделей, инженерных методов и программных средств, которые являются инструментарием информационной технологии оценивания соответствующего свойства РИС критического применения.

Применение результатов диссертационных исследований целесообразно как на этапе создания новых или модернизации существующих, так и на этапе активной эксплуатации распределенных информационных систем критического применения и составляющих их элементов.

Ключевые слова: распределенные информационные системы, модель воздействий на работоспособность, методы оценивания, критичность элемента, показатель живучести.

ABSTRACT

Kharybin A. V. Models and methods of the survivability estimation of distributed information systems. - Manuscript.

Thesis on competition of scientific degree of Candidate of Technical Sciences by specialty 05.13.06 - information technologies, National aerospace university “Kharkiv aviation institute”, Kharkiv, 2007.

Dissertation is devoted development and perfection of survivability estimation models and methods of the distributed information systems (DIS) in view of influences on serviceability of their elements and subsystems of set of the extreme factors peculiar to real functional conditions.

Scientific results are: 1) model of influences on serviceability of DIS switching and data-centres, based on complexing of two approaches to the description of processes of their functioning - as stochastic continuous representations of restored system, and also as a territorially and structurally - distributed object representations, which allows to take into account influences of such extreme factors as fire-impacts of rocket&artillery systems of arms and information (cybernetic) deliberate attacks. Application of the offered model and the survivability estimation methods based on it allows to increase adequacy and completeness of the account of negative consequences of influences of extreme functionality conditions at carrying out of an estimation of probabilistic-timing survivability indexes and coefficients; 2) model of influences on serviceability of fiber-optical information lines which is based on laws of course of physical processes in compound fragile environments at mechanical stretching loadings, takes into account constructive and operational features of real main fiber-optical cables by representation of processes of their degradation and restoration with the Markov-chains models, which allows to carry out the estimating and forecasting of changes of survivability; 3) advanced estimation method of DIS survivability which is taking into account a difference of parameters of object survivability and functional elements criticality, the structural DIS organization and features of extreme influences on its subsystems. Which give possibility to increase on 5-7 % of estimated accuracy of the considered property, and also to determine the most vulnerable elements for maintenance of critical subsystems safe functioning and systems as a whole at various stages of its life-cycle.

The offered models and method are realized as settlement models, engineering methods and software which are toolkit of information technology of estimation and supports of decision-making on maintenance of survivability of critical DIS.

Application of dissertational researches results expediently as at creation of new or re-engineering of some existing critical DIS, at a stage of active operation or on a syntheses phase.

Keywords: distributed information systems, influence model on workability, estimation method, element criticality, survivability index.

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