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“Journal of Applied Informatics” is a peer-reviewed science journal with international representation of editorial board and authors, covering a significant part of Russian IT-area. The topics of the publications are connected to the aspects of theory and application of computer modeling and information technologies in various professional areas. The journal is indexed by Russian Science Citation Index on Web of Science platform.

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In accordance with the decision of the Higher Attestation Commission of the Ministry of Education and Science of Russian Federation, journal is included in the «List of Leading Peer-Reviewed Scientific Journals and Publications authorized to publish main dissertation results»

Development of cross-platform mobile applications – promising methods and standard practices

The study reveals the current methodological aspects of the development of cross-platform mobile applications. The theoretical significance of the research lies in the generalization and analysis of software products and IDE environments that provide cross- platform development, as well as code generation utilities. The results of a comparative analysis of cross-platform development approaches and the results of a comparative analysis of cross- platform mobile application development tools are presented. The factors that slow down the development of a cross-platform application are identified. Solutions for minimizing functional losses in the conditions of building a universal software product are indicated. Data on the use of Shell scripts was provided, which will increase the efficiency of using the code generation utility. The steps for integrating common logic into native projects are identified. The practical significance of the research results is represented by the methodology for developing cross- platform mobile applications using a combination of tools to remove the identified limitations. The study contains a set of sequential actions and conclusions that the researchers came to in the process of forming a methodology for the cross-platform development of mobile applications. The methodology will allow us to develop a cross-platform software product adapted for subsequent modifications and extensions. This material can be designed in the standard of the developer company in the format of an internal document (instructions) of the developer company.

Development of the blockchain architecture of the Industrial Internet of Things system of the enterprise

The development of the digital economy in the modern world requires solving the issue of security of Industrial Internet of Things (IIoT) applications. A large number of distributed, network-based, IIoT devices managed by intelligent programs (software agents) require protection. A successful attack on any IIoT device will lead to hacking of the IIoT application and to large financial losses, as well as to the termination of the IIoT application, therefore, the research topic is relevant. The purpose of this article is to radically solve the security problem of the IIoT application by developing a blockchain architecture of the application. The authors were tasked with investigating all aspects of the blockchain system that ensure the security of IIoT application devices. The peculiarity of the blockchain system is that its participants are software agents that control the application devices. As a result of the research, the concept of the blockchain architecture of the IIoT application is proposed. He mechanisms of consensus of intelligent programs of IIoT devices as equal active participants of the blockchain network are investigated. The consensus mechanism and the cryptographic system of the distributed registry of the blockchain network increase the information security of the IIoT application. The synergistic effect of the blockchain system and intelligent systems of software agents of IIoT application devices significantly increases the efficiency of the solution. Intelligent systems of software agents and IIoT applications are effectively trained on the blockchain platform, and as a result, we get a decentralized supercomputer in the form of a blockchain system.

Economic efficiency assessment of projects for the information systems creation

The author: Kultygin O.
The article is concerned with an approach to assess the economic efficiency of IT projects, which results are recommended to be used when choosing the informatization version for organizations of various types. This approach is based on the calculation of such indicators as capital costs for an IT project, the magnitude of the projected change in operating costs to ensure the functioning of the IS (information system), the growth rate in the efficiency of business processes as a result of informatization, as well as the costs to ensure the required level of information security. The analysis results of modern trends in the IS development for informatization of organization business processes are given, which made it possible to identify the main features of the solutions offered on the market. The analysis of direct and indirect costs for an IT project is shown to be rather difficult in a number of cases, which leads to inaccuracies in assessing its economic efficiency. In this case, the estimated payback period of the project (usually unreasonably short) can be exceeded many times in practice. At the same time, as a result of rapid progress in the field of information technology, the IT projects results are subjected to intense obsolescence, so long payback periods can lead to significant losses for the organization implementing the project. The consideration of the influence of the information security threats and the necessary additional funds for its provision on the forecast indicators for the economic efficiency of the proposed IT projects can significantly affect the decisions on choosing not only the configuration of the IS but the platform on which it operates as well. The article proposes an approach to determine the costs for ensuring information security, which should be considered when assessing the IT project economic efficiency. A mathematical model is described to choose an option for the tables rational placement on IS units (database servers) used by employees of various geographically detached divisions of an enterprise, which will allow reducing operating costs for this system operation.

Formulation of the task of ensuring automation of the full cycle of decision support

The author: Tikhanychev O.
The relevance of the topic of the article is determined by the fact that the existing decision support systems (DMSS) provide automation of only part of the stages of a typical management cycle, completely imposing on the user such important ones as goal setting and management of the implementation of developed plans. This is determined by the objective difficulties of formalization and the dynamism of these stages, but breaks the single management process into autonomous, partially automated sections. No research is currently being conducted to solve this problem. Taking this into account, the purpose of the study was to obtain a descriptive formulation of the task of automating the processes of goal-setting and management for implementation in the DMSS. The article, using general scientific research methods, analyzes the content of the control cycle and the existing technologies for automating its elements. Using the results of the analysis, proposals were synthesized and the task was formulated to automate the stages of goal-setting and management of the implementation of plans, for implementation as part of the DMSS, approaches were proposed that can be used to implement the task.The problem of automating the initial stage of the management cycle, goal-setting, is proposed to be solved by using specialized expert systems. To solve the problem of decision support at the control stage, it is proposed to use simplified dynamic control algorithms. In a direct formulation, such a problem is posed for the first time. The article proposes a set of methods and basic algorithms that provide a solution to the problem of automating goal-setting and management processes and, in the future, their implementation in the structure of the DMSS.

Fuzzy case models for project management using a multi-ontology approach

The author: Chernovalova M.
The article identifies the features of innovative projects that should be taken into account when building models of information processes in decision support systems (DSS) for project management. It is shown that, in terms of taking into account these features, methods for forming knowledge in the form of ontologies and the use of information analysis procedures based on precedent methods seem to be promising. The limitations of existing precedent methods, including those involving the formation of a knowledge base in the form of ontologies for their use in project management, are revealed. Development trends in methods for representing knowledge in the form of ontologies and their use within the framework of precedent approaches are substantiated. The trends are as follows: providing the ability to use several independent ontologies for different subject areas; taking into account the differences of the analyzed projects and creating conditions for the adaptation of ontologies when the indicators of the external and internal environments of the project change. A DSS structure for project management is proposed, which provides the use of several subject and functional ontologies and a developed fuzzy logic algorithm for adapting earlier rational decisions to the current situation. Software tools implementing the proposed models and procedures are described, as well as the results of their application to decision support in managing a project to develop an innovative asynchronous electric motor. It is shown that the proposed approach allows the description of the current situation in a linguistic form. At the same time, in contrast to the known variants of precedent methods based on the use of ontological models, the described algorithm for deriving solutions allows taking into account the characteristics of the analyzed situations related to various subject and functional areas. This allows you to develop recommendations for the allocation of resources for the implementation of design work based on the analysis of positive experience in the implementation of projects of various sizes.

Model of creating an economic ecosystem in the framework of economic convergence under the influence of digitalization

The author: Kalayda S.
The article contains the study of the capabilities of choosing such a form of joint business organization by an economic convergence initiator which would ensure the maximum growth of such business under the influence of digitalization and thereby the maximum improvement of the initiator's competitive capability. The author has developed a model of creating an economic ecosystem as a really effective ecosystem which takes into account the influence of both positive and possible negative consequences of the impact of digitalization on a joint business and ensures the maximum economic benefits of the joint business. An algorithm has been developed to implement the model in the framework of a certain level and a specific product of digitalization. The main parameters of the model and the algorithm for the implementation of the same are such terms introduced by the author as an economic ecosystem, potentially the most effective economic ecosystem, a real ecosystem, and a really effective ecosystem, which are described by indicators and costs of the economic effect. Following the steps of the algorithm which implements the model will eventually make it possible to create such a version of an economic ecosystem which would bring the highest economic effect to the initiator on a certain convergence level considered when a certain digitalization product is used in the joint business. Comparison of the versions of real ecosystems obtained for each digitalization level and product makes it possible to select the final version which would produce the maximum economic effect for the initiator with respect to convergence levels and digitalization products and hence the maximum growth of the initiator's competitive capacity. The economic ecosystem formed on the basis of the developed model and the algorithm that implements it gives the initiator of the joint business the greatest advantages in a competitive economy.

Models and methods of reinforcement learning in the structure of adaptive web-based information systems

The author: Shpolyanskaya I. Y.
Widespread use of web-based systems in business, marketing, e-learning, etc. makes it necessary to take into account and analyze the information needs of the user in order to optimize interaction with him. One of the main problems of creating adaptive web-based systems is the task of classifying information resources (pages) of the portal describing the offered product or service, for the subsequent formation of the user profile and personalized recommendations of services. Data mining and machine learning methods can be used to solve this problem. The article presents a new approach to creating adaptive web-based information systems using the reinforcement learning algorithms to classify information resources and to form personalized recommendations to users based on their preferences. An adaptive approach is proposed and justified, based on the use of Reinforcement Learning procedures, which allows you to automatically find the most effective strategies for the correct classification of the site's resources and the formation of user groups with the same type of requests and preferences. The proposed scheme allows you to create procedures for evaluating and ranking information resources of the system based on the analysis of user behavior on the site online. The reinforcement learning algorithms used make it possible to evaluate the relevance of each page of the site to the requests and preferences of the users from different categories in order to optimize the structure and content of the site, as well as to build an effective system of recommendations in accordance with the user's interests to be able to choose the most suitable products or services.

On the issue of modeling a high-voltage insulator in the COMSOL Multiphysics 5.6 soft package

The article discusses the main aspects of modeling suspended polymer high-voltage insulation of overhead power lines (PTL) in the COMSOL Multiphysics 5.6 software package. Analytical expressions of the mathematical model of the electromagnetic field around the insulator are given, on the basis of which a numerical solution is formed within the software package that allows you to build a model of the electric field in two-dimensional and three-dimensional space. There are three main stages of working with the program interface. At the first stage, the task of the geometric dimensions of the model and the surrounding area is considered, attention is paid to the formation of the design features of polymer insulators. In the second stage, the physical properties of the structural materials of the insulator, as well as the surrounding space, are described. The third stage is reduced to the determination of boundary conditions for solving the Poisson differential equation. Recommendations for finite element mesh density are given. A gradient picture of the distribution of the electric potential near the surface of the insulator is presented. The graphs of the distribution of the normal component of the electric field strength along the surface of the insulator are also plotted. On the basis of the obtained results, the influence of external factors on the properties of the polymer insulator is studied. A possible variant of modeling influencing factors, such as pollution and moisture, by making changes in the description of the physical properties of the insulator surface, namely by including a uniform and continuous layer with a given conductivity, is described. The distribution of the normal component of the electric field strength along the surface of the insulator with contamination is obtained. The results of modeling the electric field distribution with the presence of contamination on the surface of the insulator and its absence are summarized in the table where the electric field strength is indicated depending on the distance to the traverse. Based on the analysis of the results obtained, an assumption is made about the overestimated level of the maximum electric field on the insulators recommended by the manufacturers. The convergence of the considered models with the experimental data obtained in the course of long-term observation of the dynamics of the degradation and aging processes of the surface of polymer suspended insulators of overhead transmission lines is discussed.