Volume 6 Issue 1


Volume 6 Issue 1

Download one file 161


Demenkova Т.А.,
Tomashevskaya V.S.,
Shirinkin I.S.

Mobile applications for tasks of distance learning 94

The article considers the actual problem of transferring some tasks of the distance learning onto a mobile platform. The research was carried out on the basis of several generations of custom-designed software for the preparation of masters on the direction «Informatics and Computer Technlolgy» within the framework of the program «Architecture of Computer Technology and Information Systems». The paper describes the technology for developing and implementing a mobile application for a distance learning system for smartphones running the Android operating system. The task was to apply the system for the organization of distance learning in the international double-degree program in the framework of cooperation with foreign universities. The specificity of such an application lies in the possibility of teaching in English using software to combine the two training programs of participating universities to form individual training plans depending on the previous master's knowledge. It is planned to include special developments, for example, the use of task solvers to reduce the burden on teachers accompanying the learning process. This will reduce the time when solving difficult tasks as related to hardware implementation of algorithms for digital processing of information. Thus, we can speak about the expansion of the research part of this scientific project and the emerging possibility of using a mobile application for research and implementation of practices for obtaining professional skills and professional experience that occupy a significant place in the curriculum of undergraduates. The approach and methodology are proposed for implementing an individual distance learning system based on standard application modules using emulators. The results of experiments according to key parameters of the program system are presented.

Keywords: distance learning, mobile application, digital device design, Android, clientserver.



Babenko V.P.,
Bityukov V.K.,
Kuznetsov V.V.,
Simachkov D.S.

Simulation of static and dynamic losses in MOSFET keys 82

Issues of modeling of losses in MOSFET keys from the Electronics Workbench (EWB) program library as well as optimization of the power key operation mode are considered. A number of important facts have been obtained by using the EWB program of circuit simulation, which should be taken into account when designing power electronics devices and secondary power sources for radioelectronic facilities, in particular. It is shown that the power of static losses depends on the resistance of the open transistor channel, the current flowing through the transistor, duty cycle, and it does not depend on the gate current. While the power of dynamic losses at the time of switching the transistor on depends on the gate current, it decreases with the increasing current. When a gate current (driver) is more than 0.6 A, the reduction of loss is insignificant, and it is best to choose a driver with output currents of more than 0.6 A. However, this is true only for the investigated IRF1010N transistor. In the schemes of building the MOSFET keys on other transistors, the best output current of the driver may differ. The power of dynamic losses when turning the transistor off does not depend on the gate current. However, this is true only for this scheme, because the discharge of the gate capacitance occurs through a resistor with a fixed value for the key resistance. Usually the output stage in the control circuit is executed in a push-pull circuit and has the same output resistance for the incoming and outgoing output current of the driver, the physical processes of switching on and switching off are practically identical, and so the quantitative results can be close. The simulation of the MOSFET key in the EWB program provides adequate results in determining the parameters of the power transistors, which are in agreement with the data given in the Datasheet. This allows simulating the key losses and minimizing them at any load.

Keywords: simulation, static loss, dynamic loss, MOSFET key, open transistor channel resistance, input capacitance, Miller effect, switching losses, circuit simulation, driver, total gate charge, switch on time, switch off time.



Struchenkov V.I.

The use of parabolic splinees in CAD of linear structures 34

The article continues studying the problem of the calculus of variations that occurs in line structures routing, in particular, roads. The task is to find a line that satisfies all technical constraints and gives a minimum of a given functional, for example, construction costs. The unknown extremal is a parabolic spline, that is, a plane curve, the elements of which are parabolas of the second order conjugated by line segments. The principal feature of the problem is that the number of spline elements is unknown. The spline parameters must satisfy the constraints on the first derivative and curvature. Besides, also the ordinates of the individual points may be restricted. In addition, the lengths of the spline elements must be at least the given values. The problem is solved in two stages. First, the number of elements is determined, and then their parameters are optimized. Algorithms of nonlinear and dynamic programming are used. The structural features of the constraint system are taken into account, and an algorithm for constructing a basis in the null space of the matrix of active constraints is given. As an alternative, an algorithm is implemented that uses penalty functions for violation of constraints on ordinates of given points. The successful implementation of algorithms is reported.

Keywords: route, horizontal and vertical alignment, nonlinear programming, objective function, gradient, feedbacks.



Askretkov A.D.,
Koryakov A.G.

The some economic aspects of production of pharmaceutical substance hydroxyethyl starch in small industrial scale

This article describes economic aspects of the technology of drug substance hydroxyethyl starch (HES) 130/0.4 production in small industrial scale. This substance is used as plasma substitute and has several advantages over other analogs (infusion solutions based on gelatin, dextran, albumin, blood plasma etc.) such as low cost, guaranteed lack of viruses, a small number of adverse effects and health complications. Developing the technology for producing this substance is of current interest, because only foreign HES and infusion solutions from foreign manufacturers are present in the Russian market today. As of 2016, the total market volume of HES-based infusion solutions was about 157 million rubles. So, its production is quite promising. The authors of this article calculated the cost of organizing this substance production in small scale (500 kg per year). The cost of equipment, reagents and organizational procedures for the first and subsequent years was calculated. As expected, the source of funding is a grant of the Foundation for Assistance to Small Innovative Enterprises, as well as private investors interested in implementing this project. The project generates a net present value of 644470 rubles, and the investments pay-back period will be a little more than one year. In addition to repayment of resources, the project will allow developing a technology for larger scales. This will enable facilitating the organization of industrial scale pharmaceutical manufacturing.

Keywords: drugs, drug substance, pharmacy, hydroxyethyl starch, infusion solutions, import substitution, economical aspects.


Krasnyanskaya O.V.,
Mandych I.A.

Management of marketing potential of the company 39

This article considers the ability of managing the development of a company based on its marketing potential. Today, the problem of managing the development of the company becomes more and more important due to the complication of the processes in the market, due to the growth of the competition. Therefore, new decisions are necessary. Strategic management based on the marketing potential is one of these decisions. Marketing potential is an integral part of the common potential of the company. It can influence the company’s income. Besides, using the marketing instruments in the market competition conditions is also an integral part of success of any company. Knowing the company’s marketing potential lets it to manage resources effectively for achieving the best results. Moreover, the article considers the main approaches by modern authors to the notion of “marketing potential”: resource, resulting and targeted approaches. The main interpretations of this notion are represented, and the author’s definition is formed. Furthermore, the structure of marketing potential is presented. It consists of 5 key subsystems: reserves, resources, ability, opportunity, management. A step-by-step process of managing them is shown. The authors made the analysis of actual approaches of estimating the marketing potential of the company (resulting, diagnostic, complex). As a result the main criteria of its evaluation were found. They are the price policy, actual market share of the company, availability and level of research, ads research, methods of promotion and stimulation, information about the competitors, studies of future needs and customer wishes. These criteria were used for estimating the marketing potential of 4 famous companies on the basis of the method of expert estimation.

Keywords: marketing, marketing potential, estimation of marketing potential, management of marketing potential.



Kalinov V.V.

The achievements and failures of the state scientific and technical policy of the USSR in the postwar period 53

The article investigates certain aspects of one of the current issues of the Russian history, the least studied and discussed at present. On the basis of the analysis of scientific literature and previously unpublished archival documents, attempts to identify the factors that determined the adjustment and essence of the industrial and scientific-technical policy in the postwar period, the essence and results of the reorganization in the management of scientific and technical sphere. We conclude that successful implementation of post-war large-scale projects proves that there was only one possible strategy chosen by the country's leadership. In particular, the postwar geopolitical realities and the need for early recovery and strengthening of the Soviet economy demanded from the Soviet leadership a most pragmatic approach as to the issue of "borrowing". Besides, a strong research and technical complex was formed, and very impressive results were achieved, especially in the defense sphere. However, the study showed that the intensification of scientific and technical research, transformation of science into a determining factor of economic development of the country in those years failed to become a priority. The slowdown and deficiency of control were due to the increasing role of the party apparatus in the state bodies, due to the reorganizations in the system of national economy management, due to the departmental approach and shortcomings in planning, due to the insufficient professionalism of the Soviet leadership.

Keywords: scientific-technical policy, recovery period, scientific potential, national projects.