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The paper deals with the problem of evaluating the characteristics of information systems at the design stage. In the design of ERP-systems the most interest characteristic is not the average time, but the probability of timely delivery of different type messsages (for example, command, service, multimedia, files, etc.) from the sender to the recipient. In addition, the possibility of using the priority information management built on the basis of service disciplines of general form with mixed priorities must be c...

The quality of the operation of broadband wireless computer networks is largely determined by the mechanism of an ordered centralized poll of terminal stations, called polling. The models of polling systems adequately describe the operation of broadband wireless networks under the control of Wi-Fi and Wi-MAX protocols with a centralized coordination function (PCF). Despite the complexity and high cost, the equipment supporting centralized management most effectively uses the most valuable resources of a broadband ...

The role-oriented concept of programming is becoming more common in recent times. Expanding the traditional object-oriented paradigm, it allows us to apply a more flexible approach to the development of the information system and simplify the task of the developer. The use of role-oriented structures in modern applications raises the question of storing them in a database. The task of extracting homogeneous semantic entities from structured documents has a high potential for solving with the use of roles or their ...