Web-ориентированная система моделирования как элемент информационной поддержки жизненного цикла изделий
The article deals with the general approach to the construction of a distributed system of circuit simulation as part of information support of the product life cycle. The implementation of these approaches is demonstrated on the example of the creation of one of the elements of the system. This work/article is an output of a research project implemented as part of the Basic Research Program at the National Research University Higher School of Economics (HSE).
The purpose of this article is to provide a mathematical model to numerically estimate the parameters of the life cycle of the technical documentation on high-tech enterprises. Methodology of constructing such a model based on the consideration of statistical regularities of the life cycle of technical documentation involved in different projects. It uses data from the knowledge base of the enterprise. This work has revealed the basic rules of constructing mathematical models of similar estimates of the parameters of the life cycle of technical documentation as a result. This article is focused on the duration as a parameter of the life cycle. The constructed model analysis is universal and applicable to almost any high technology enterprise, which has its own knowledge base. Sure thing that the task of evaluating the various parameters of the life cycle of the technical paper is very relevant. Managers often must be aware of the total material costs of the project with a specific set of technical documentation before it starts. The constructed model is based on statistical regularities that exist for various projects in the enterprise, separated in time, thereby allowing the manager to have an idea about the project before it starts.
In the paper the matters of development of corporate governance and strategic management information support systems are considered. For management purposes related with development of such systems a methodological approach is proposed. The approach stipulates three management levels: upper (the level of the system in whole), middle (the level of subsystems) and lower (the level of development projects). General management functions such as design, planning and control are considered within the managerial scheme. Feedforward and feedback relations between certain management functions, including functions of different hierarchical levels, are described.
This paper presents a new integration technique for time-domain simulation of nonlinear electronic circuits. The new technique exploits A-stable single-step integration methods of order 1 up to 4 obtained by applying the Obreshkov formula to charge oriented circuit equations. The predictor-corrector algorithm exploited in the transient analysis for solving the initial value problem is described. The numerical examples of time-domain simulation are given which demonstrate the numerical accuracy and efficiency of the proposed technique.
The article is aimed at researching and finding gaps in the state regulation of information support for the attraction of foreign investments. In addition, the issue of foreign investors' access to information is examined.
The article considers the processes of progress in production and service sectors and answers the question how and thanks to what service sector of Russian economy left the productive one behind (concerning contribution in GDP of our country). The rates of development of service sector turned out to be so high firstly - as a reason of peculiarities of new Russian economy, which historically was built on the market principles and was developing in conditions of investment resources deficit, secondly - as a reason of system differences between «physical» goods and services as an object of sale. Nowadays Russia faces an unusual symbiosis: effective service companies, operating in hard competitive sphere with average profitability and non-affective from the point of management industrial companies, which thanks to monopolistic pricing have great profitability, providing profits of Russian budget and determining a macroeconomic situation.
A model for organizing cargo transportation between two node stations connected by a railway line which contains a certain number of intermediate stations is considered. The movement of cargo is in one direction. Such a situation may occur, for example, if one of the node stations is located in a region which produce raw material for manufacturing industry located in another region, and there is another node station. The organization of freight traﬃc is performed by means of a number of technologies. These technologies determine the rules for taking on cargo at the initial node station, the rules of interaction between neighboring stations, as well as the rule of distribution of cargo to the ﬁnal node stations. The process of cargo transportation is followed by the set rule of control. For such a model, one must determine possible modes of cargo transportation and describe their properties. This model is described by a ﬁnite-dimensional system of diﬀerential equations with nonlocal linear restrictions. The class of the solution satisfying nonlocal linear restrictions is extremely narrow. It results in the need for the “correct” extension of solutions of a system of diﬀerential equations to a class of quasi-solutions having the distinctive feature of gaps in a countable number of points. It was possible numerically using the Runge–Kutta method of the fourth order to build these quasi-solutions and determine their rate of growth. Let us note that in the technical plan the main complexity consisted in obtaining quasi-solutions satisfying the nonlocal linear restrictions. Furthermore, we investigated the dependence of quasi-solutions and, in particular, sizes of gaps (jumps) of solutions on a number of parameters of the model characterizing a rule of control, technologies for transportation of cargo and intensity of giving of cargo on a node station.
Generalized error-locating codes are discussed. An algorithm for calculation of the upper bound of the probability of erroneous decoding for known code parameters and the input error probability is given. Based on this algorithm, an algorithm for selection of the code parameters for a specified design and input and output error probabilities is constructed. The lower bound of the probability of erroneous decoding is given. Examples of the dependence of the probability of erroneous decoding on the input error probability are given and the behavior of the obtained curves is explained.
Event logs collected by modern information and technical systems usually contain enough data for automated process models discovery. A variety of algorithms was developed for process models discovery, conformance checking, log to model alignment, comparison of process models, etc., nevertheless a quick analysis of ad-hoc selected parts of a journal still have not get a full-fledged implementation. This paper describes an ROLAP-based method of multidimensional event logs storage for process mining. The result of the analysis of the journal is visualized as directed graph representing the union of all possible event sequences, ranked by their occurrence probability. Our implementation allows the analyst to discover process models for sublogs defined by ad-hoc selection of criteria and value of occurrence probability
Let G be a semisimple algebraic group whose decomposition into the product of simple components does not contain simple groups of type A, and P⊆G be a parabolic subgroup. Extending the results of Popov , we enumerate all triples (G, P, n) such that (a) there exists an open G-orbit on the multiple flag variety G/P × G/P × . . . × G/P (n factors), (b) the number of G-orbits on the multiple flag variety is finite.
I give the explicit formula for the (set-theoretical) system of Resultants of m+1 homogeneous polynomials in n+1 variables