Browsing by Author "Шкілюк, О. П."

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    Методика оцінки показників ефективності радіоелектронного комплексу моніторингу повітряного простору
    (Видавництво Львівської політехніки, 2013) Волочій, Б. Ю.; Озірковський, Л. Д.; Шкілюк, О. П.; Мащак, А. В.
    In this paper a method for estimation efficiency indexes for algorithm behavior of radioelectronic complex system of airspace monitoring is developed. This method takes into account the structure of adioelectronic complex system of airspace monitoring, technical and tactical characteristics of the reliability of hardware and qualifications of the human operator. Method involves the following stages. Forming of equivalent algorithm behavior is the first stage. Equivalent algorithm behavior is composed of operating and verifying blocks which reflect the functions of the radioelectronic complex system and the actions of human operator. For equivalent algorithm behavior forming is required to add two types of operating blocks that will characterize the reliability of hardware and software. Developing structural-automatic model is the second stage. Structural-automatic model is formalized representation of structure and behavior of radioelectronic complex system. Developing of structural-automatic model involves solving the following tasks: select a set of parameters of radioelectronic complex system that must be included in its model. The components of the vector state and basic events are defined. Modificational component rules tree of the state vector based on the components of the vector state and basic events is formed. The model of the algorithm behavior radioelectronic complex system is developed as a graph and state transitions. Developing of this model is the third stage of method. This task is performed using the software module ASNA-1. The system of linear differential equations of Kolmogorov - Chapman is formed and solved by program module ASNA-1. Solution of linear differential equations is obtained in the form of probability distribution being in the states. The fourth stage provides for forming and investigation of the efficiency indexes for algorithm behavior of radioelectronic complex system of airspace monitoring based on probability distribution being in the state. This method is the further development of modeling technology of discreet-continuous stochastic systems and multiple analysis for efficiency indexes of complex information systems. The example of the application of this method for resolving tasks of the system-technical designing radioelectronic complex sytem of airspace monitoring is represented. Розроблено методику оцінки показників ефективності алгоритму поведінки радіоелектронного комплексу моніторингу повітряного простору з урахуванням його структури, техніко-тактичних характеристик, показників надійності апаратних засобів та кваліфікації людини-оператора. Розроблена методика є подальшим розвитком технології моделювання та проведення багатоваріантного аналізу показників ефективності складних інформаційних систем.
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    Оцінка надійності програмно-апаратних систем за допомогою моделі їх поведінки
    (Видавництво Львівської політехніки, 2014) Волочій, Б. Ю.; Озірковський, Л. Д.; Чопей, Р. С.; Мащак, А. В.; Шкілюк, О. П.
    Описано побудову моделі надійнісної поведінки програмно-апаратної системи у вигляді графа станів та переходів, яка враховує появу відмов та збоїв програмного забезпечення та апаратних засобів, їх наслідки, що призводять до простою, а також способи відновлення працездатності. За рахунок досягнутого ступеня адекватності запропонованої моделі підвищено достовірність розраховуваних показників надійності програмно-апаратної системи. Проведені дослідження показали різницю між значеннями функції готовності програмно-апаратної системи та ймовірності її перебування в стані простою, визначеними з урахуванням короткочасної та повної зупинок апаратних засобів. Hardware/software systems provide flexible implementation of microprocessors, microcontrollers and various peripheral devices and supply the ability to perform almost any functional algorithm that can be simply modified or replaced. For reliability estimation of hardware/software systems we must take into account not only the loss of efficiency, which was caused by the hardware failures, but the abnormal functioning, that was caused by software failures. All these features of hardware/software systems must be considered in their models for reliability indexes estimation. Development of mathematical models of hardware/software system begins with establishing the cause-and-effect relationships of its efficiency violations. Basing on these cause-and-effect relationships the structural-automatic model, which is formalized representation of structure and behavior of hardware/software system, was developed. This structural-automatic model and software module ASNA allows obtaining the analytical mathematical model of hardware/software system as graph of states and transitions. Development of structural-automatic model involves solving the following tasks: forming the vector of states, forming the set of formal parameters, defining the basic events and forming the tree of modification rules of vector’s of states components. Features of forming the vector of states are that the hardware state affects the software state and on the contrary, so the hardware/software system’s state must be represented by two vector’s of states components: one to display the hardware state and the other to display the software state. The set of formal parameters contains all constants and their values, which are used for constructing the mathematical model. Basing on the information of Crittercism, IBM, Microsoft and Ballista OS Robustness Test Suite the intensities of hardware and software faults and failures were calculated. Other required initial data were obtained too. Also, 12 basic events, which can be occurred, and development of the tree of modification rules of vector’s of states components were submitted in the model of hardware/software system. The specification of states and transitions was given and the graph of states and transitions was presented. From the developed model of the system’s behavior we can clearly distinguish three types of states, which are related with faults and failures of hardware and of software separately as well as of hardware and software collectively. Using the developed model the reliability indexes of non-reserved hardware/software system, which provides software restart when it hangs up, were researched. This mathematical model allows us to get standardized parameters of reliability and availability and other reliability indexes, which can be required by designers or engineers for comparison the competitive variants of hardware/software systems with different hardware and software configurations.