Управление реализацией экономического потенциала региона: общественная и коммерческая стоимость ресурсов
The author solves the problem of choosing an optimal variant of the use of certain resources which are at the disposal of regional governments.
The article discusses the application of statistical modeling for the durability prediction of electronic equipment. Durability indicators are one of the important characteristics of onboard electronic equipment of spacecraft with long terms of active existence. The purpose of the study is to improve the quality of design work by improving the method of calculating the life of electronic equipment, taking into account the probabilistic characteristics of the life components of its electronic components. The object of the study is a typical procedure for calculating the life of electronic equipment at the design stage from data on the characteristics of the durability of electronic components. The subject of the study are methods, models and algorithms applicable to the analysis of the design level of the durability of electronic equipment. To study the effectiveness of statistical modeling, software was developed and the reliability of its work was tested. With the help of this software, computational experiments were carried out. Comparison of the results of statistical modeling and calculations by a typical methodology made it possible to identify a number of significant limitations of the deterministic method. In the standard methodology, it is assumed that the variation coefficient of life is a constant for all electronic components. But the analysis of Data Sheet of electronic components has shown that the values of the variation coefficient can be different for electronic components of different types. The calculations have confirmed the need to take into account the values of the variation coefficient of life in predicting the durability of electronic equipment. In addition, in the standard methodology it is assumed that the life of electronic equipment that contains electronic components with the same life values will be equal to the life of electronic equipment that contains only one such electronic component. Computational experiments have shown that the life of electronic equipment that contains electronic components with the same life values will be less than the life of electronic equipment that contains only one such electronic component. Based on the studies, the scope of the standard methodology was determined and the effectiveness of statistical modeling was proved. However, the results obtained by the statistical modeling method should be corrected by the results of the tests and the controlled operation of electronic equipment.
Distributed environments with the decoupling of users from resource providers are generally termed as utility Grids. The paper focuses on the problems of efficient job flow distribution and scheduling in virtual organizations (VOs) of utility Grids while ensuring the VO stakeholders preferences and providing dependable strategies for resources utilization. An approach based on the combination of the cyclic scheduling scheme, backfilling and several heuristic procedures is proposed and studied. Comparative simulation results are introduced for different algorithms and heuristics depending on the resource domain composition and heterogeneity. Considered scheduling approaches provide different benefits depending on the VO scheduling objectives. The results justify the use of the proposed approaches in a broad range of the considered resource environment parameters
In article methods of increase of accuracy of measure calculations of non-failure operation and durability of microwave devices which are widely applied both in household appliances, and in modern devices and systems of space engineering are considered. It is obvious that operability of such microwave devices is extremely important as their refusal conducts to failure of the radioelectronic equipment (REA) as a whole. Feature of microwave devices is that a large number of constructive (mechanical) components is their part. However, in case of an assessment of indicators of reliability of REA consider only electronic component base, accepting all constructive (mechanical) components highly reliable, almost not influencing sizes of indicators of nonfailure operation, durability and a keeping. In confutation of it in article the example of measure calculation of reliability of the microwave switchboard is given and need of accounting of mechanical components and temporary working schedules is proved.
In Resource-Constrained Project Scheduling Problem (RCPSP), two kinds of constraints are considered: the precedence constraints, which can be eliminated by using critical path method, and the resource con- straints. This paper focuses on the latter, specifically, on estimating max- imum resource loads. We examine a variant of vector sum problem with fractions: considering preemptions allowed, determine what part of each of n jobs should be accomplished in order to minimize quadratic sum of non-consumed amounts of resources subject to resource constraints along with minimizing the number of preemptions. We prove that in case of 2 resources, the optimal solution contains only 2 or less preemptions, and present two polynomial algorithms of finding such solution with complex- ities O(nlogn) and O(n 2 ) operations, the latter leaves space for modifi- cation, e. g. for a weighted variant of the problem. We also present an investigation on the general case of arbitrary number of resources.