International Humanitarian University

Odessa, Ukraine

International Humanitarian University

Odessa, Ukraine

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Zaitsev D.,International Humanitarian University
CEUR Workshop Proceedings | Year: 2010

The universal inhibitor Petri net was constructed that executes an arbitrary given inhibitor Petri net. The inhibitor Petri net graph, its marking and the transitions firing sequence were encoded as 10 scalar nonnegative integer numbers and represented by corresponding places of universal net. The algorithm of inhibitor net executing that uses scalar variables only was constructed on its state equation and encoded by universal inhibitor Petri net. Subnets which implement arithmetic, comparison and copying operations were employed.


Zaitsev D.A.,International Humanitarian University
Cybernetics and Systems Analysis | Year: 2012

A universal inhibitor Petri net executing an arbitrary given inhibitor Petri net is constructed. An inhibitor Petri net graph, its marking, and transition firing sequence are encoded as 10 scalar nonnegative integer variables and are represented by the corresponding places of the universal net. An algorithm using only these scalar variables and executing an arbitrary inhibitor net is developed based on the state equation and is encoded by the universal inhibitor Petri net. Subnets that implement arithmetic, comparison, and copy operations are employed. © 2012 Springer Science+Business Media, Inc.


Goncharuk A.G.,International Humanitarian University
International Journal of Technology, Policy and Management | Year: 2016

The purpose of this study is to define the key sources of investments for steel and chemical companies under the pressure of high gas prices, and the government's capability to activate their investment activity. The author used the traditional methods of structural, dynamic and statistical regression analysis to investigate the sources of investments and to identify the establishing of quantitative relationships between natural gas prices and the company's indicators. When natural gas prices grow an investment activity of the steel and chemical companies is declining. Under the tough pressure of gas prices, these companies use only two sources of investments: long-term loans and depreciation funds. If the company's unprofitability is long-lasting, depreciation is not enough even to cover losses, thus, the company has to accumulate loan debts or to become bankrupt. To ensure break-even operations of such enterprises, the government should keep price for natural gas below certain thresholds. Using the developed models, author determined critical levels of natural gas prices for metallurgical and chemical industries. Copyright © 2016 Inderscience Enterprises Ltd.


Goncharuk A.G.,International Humanitarian University
International Journal of Energy Sector Management | Year: 2013

Purpose: The paper aims to test the hypothesis about increasing the efficiency of gas distribution companies in the period of high gas prices on the example of Ukraine that is highly dependent on this energy source. Design/methodology/approach: The basic and super-efficiency models of data envelopment analysis (DEA), Malmquist total factor productivity index, three-factor production function and other tools are used to analyse the efficiency of gas distribution companies. Some factors are examined for their impact on efficiency. The results are based on the samples of 33 Ukrainian gas distribution companies. Findings: The author detects the decreasing returns to scale in the gas distribution sector, which means that Ukrainian gas companies get advantage reducing the volume of gas supply. Rise in prices for imported gas is reflected positively not only on the income of the exporting Russian supplier Gazprom, but also on the profitability of Ukrainian gas distribution companies. The losses associated with the policy decisions regarding a pricing of imported natural gas moved on the consumers of natural gas - the manufacturing sector of the economy and the population. Reallocation of net profit from the key export sectors of Ukraine in the gas sector is mainly caused by the fault of the state regulatory body. Research limitations/implications: The research is limited by single industry and by relatively short data set. The former is explained by requirement of technology (product, service) homogeneity when using DEA tools. The latter is connected with specificity of the industry and generally little numbers of firms in it. Practical implications: The results of researching contain the data and recommendations to companies' management and a state regulatory body to correct and optimize their decisions to make gas distribution system and economy more effective. These results can be practicable for companies' management, present and potential investors and proprietors, regulative public authority. It is possible to use the results of this research to make study for the other industries. Originality/value: This is the first paper that studies the impact of high natural gas prices on the economy and gas distribution system of Ukraine. © Emerald Group Publishing Limited.


Zaitsev D.A.,International Humanitarian University
Automatic Control and Computer Sciences | Year: 2013

A technique of the computing grids verification using invariants of infinite Petri nets was presented. Models of square grid structures in the form of parametric Petri nets for such edge conditions as connection of edges and truncated devices were constructed. Infinite systems of linear algebraic equations were composed on parametric Petri nets for calculating p-invariants; their parametric solutions were obtained. P-invariant Petri nets are structurally conservative and bounded that together with liveness are the properties of ideal systems. Liveness investigation based on siphons and traps can be implemented using p-invariants of modified nets. © Allerton Press, Inc., 2013.


Zaitsev D.A.,International Humanitarian University
IEEE Transactions on Systems, Man, and Cybernetics: Systems | Year: 2016

We show that Sleptsov place-transition nets (that allow transition firing in multiple instances at a step) run fast by implementing multiplication and division operations in polynomial time. In comparison, Petri nets (PNs) implement the mentioned operations in exponential time. Moreover, PNs are obtained as a special case of Sleptsov nets (SNs) using loops with places having unit marking attached to each transition. In addition, we develop basics of an SN programming technology including basic operations and program composition rules. We provide examples of programs written in SN language for encryption/decryption with the RSA algorithm, calculation of fuzzy logic functions, and parallel calculation of the solutions to Laplace equations. SN computers promise hyper-performance because of a concurrent programming style consisting of a concise graphical language and small granulation of parallel processes on the level of separate events. © 2015 IEEE.


Azarova I.,International Humanitarian University
Magazine of Civil Engineering | Year: 2015

The urgency of the problem of providing people in CIS countries with quality, affordable housing with minimal risk of implementation of housing projects is obvious. To solve this problem, the authors proposed to review the principles of managing investment and construction housing projects based on project management tools, stakeholder theory and evolutionary theory of values. It is necessary to shift the focus from maximizing profits of construction companies to increasing the satisfaction with the significant social housing projects for all of their stakeholders. The aim of this study is to develop an effective and easy-to-use mechanism for evaluating, balancing and managing the social and public values of property along with its monetary value. The value of residential projects is expressed in non-financial indicators in order to get away from the idea of profit maximization. The value of the project is regarded as the coincidence between results of the project and the interests of its stakeholders, and stakeholder interests are represented as the desired economic, social, psychological, resource and other expected benefit of the project. The proposed system of value-based management of housing projects covers the period of the investment project from the idea of a residential building to its end of exploitation. We discuss which groups of agents should manage value-oriented housing projects and the means by which it should be implemented. A technique of analyzing project stakeholders based on expert evaluations is proposed, and a mathematical model for assessing the value of projects in non-financial terms is developed. The results achieved using current theoretical and methodological principles correspond to the goals of scientific research and can be used in value-oriented management of residential projects as well as in other sectors of project management in research and educational processes.


Zaitsev D.A.,International Humanitarian University
IEEE Transactions on Systems, Man, and Cybernetics: Systems | Year: 2014

A universal Petri net with 14 places, 42 transitions, and 218 arcs was built in the class of deterministic inhibitor Petri nets (DIPNs); it is based on the minimal Turing machine (TM) of Woods and Neary with 6 states, 4 symbols, and 23 instructions, directly simulated by a Petri net. Several techniques were developed, including bi-tag system (BTS) construction on a DIPN, special encoding of TM tape by two stacks, and concise subnets that implement arithmetic encoding operations. The simulation using the BTS has cubic time and linear space complexity, while the resulting universal net runs in exponential time and quadratic space with respect to the target net transitions' firing sequence length. The technique is applicable for simulating any TM by the Petri net. © 2013 IEEE.


Zaitsev D.A.,International Humanitarian University
Automation and Remote Control | Year: 2014

The paradigm of computations on the Petri nets was shown to appreciably speed up the computations and reduce laboriousness of software development owing to the mass parallelism and asynchronous information processing. A language of the programmed Petri nets was developed, alternative approaches to realizing the paradigm at the micro and macro levels were proposed, and the estimates of complexity of the earlier universal Petri net that are prototypes of the corresponding processor were specified. Indicated were the lines of practical realization of the paradigm such as the development of the technology of programming on the loaded Petri net, technology of translation of the loaded Petri nets to the inhibitory Petri nets, and the efficient hardware processors executing programs in the language of the inhibitory Petri nets. Fast computations are supported by the nets of the Sleptsov class with multiple start of transition at a step. © 2014 Pleiades Publishing, Ltd.


Goncharuk A.G.,International Humanitarian University
International Journal of Energy Sector Management | Year: 2015

Purpose – The purpose of this paper is to establish groups of stakeholders who win and lose from changes in natural gas prices and to develop practical recommendations for a state regulator for the optimal setting natural gas prices in the domestic market through an example of Ukraine. Design/methodology/approach – In this study, to identify groups of stakeholders with gains and losses from the pricing of natural gas, the author used traditional methods of correlation and statistical regression analysis, including the ordinary least squares (OLS) method. Findings – The main profit from natural gas remains in the extraction sector. The remaining profit is distributed among the various stakeholders. The consumers during rapidly rising gas prices have to rely on energy efficiency and switching to alternative, less costly resources. The existing system of unified natural gas price for all industrial consumers is inefficient and leads to the losses of the largest industrial sectors in Ukraine – metallurgy and chemical industry. With the help of the developed models, the author determined the critical levels of natural gas prices for these two industries. Research limitations/implications – The study is limited by data about activity of eight key manufacturing companies, four gas distribution companies, and main state gas companies from two country only. Practical implications – Defined levels can be used by a state regulatory authority as a boundary, above which these industries will be unprofitable and their fate along with hundred thousands of workers will be questionable. Originality/value – This is the first paper that set the critical levels of natural gas prices for two manufacturing industries in Ukraine. © Emerald Group Publishing Limited.

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