2017

Постійне посилання на розділhttps://repository.kpi.kharkov.ua/handle/KhPI-Press/28160

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Зараз показуємо 1 - 20 з 1134

1917 – революція: 100 років потому
(НТУ "ХПІ", 2017) Журавльов, Ю. В.; Кіпенський, Андрій Володимирович
3D програмно-конфігуровані комутаційні структури на елементах Березовського
(НТУ "ХПІ", 2017) Березовський, Станіслав Олександрович
Показано використання графічної моделі комутаційного елемента Березовського, як складової компоненти набору - інструментарію для мови образів, що дозволяє створити відповідну бібліотеку образів для творчого людино-машинного процесу проектування масштабованих і 3D топологій комутаційних фабрик і структур, мереж під завдання "Індустрія 4.0". Підхід, що розглядається пропонує розробку відкритої платформи для розподілених мережевих сервісів, яка дозволить централізовано керувати комп'ютерними мережами, ПКС що, зокрема, дасть можливість незабаром випустити незалежні від виробників апаратного забезпечення системи віртуалізації мережевого обладнання.
3D-модель теплового обміну в міокарді та коронарних судинах серця
(НТУ "ХПІ", 2017) Шликов, Владислав Валентинович
Запропоновано математичну 3D-модель теплового обміну в міокарді та коронарних судинах серця, що враховує теплопровідність і вільну конвекцію тепла в шарі міокарда для двох біофізичних станів тканин шлуночків серця – з нормальною щільністю розподілу коронарних судин у міокарді, а також за наявності зон ішемії у міокарді, які збіднені коронарними судинами. Таким чином, модулювання теплових процесів у міокарді підтверджує клінічні прояви хвороби серця, які вказують на невідповідність коронарного кровотоку метаболічним потребам серцевого м'яза. Отримані для теплової моделі температурні залежності дозволяю оцінити ступінь коронарної обструкції й ступінь звуження коронарних артерій у шлуночках серця, що є величиною пропорційною до змін температури.
80 лет со дня рождения доктора технических наук, профессора Самидова Халила Самидовича
(НТУ "ХПИ", 2017) б/а
Adaptive training system for IT-companies personnel: design principals, architectural models and implementation technology
(НТУ "ХПИ", 2017) Sokol, V. E.; Tkachuk, M. V.; Vasetska, Y. M.
Investigated problems and not resolved issues related to corporate training for IT-companies personnel, explored the actuality and goal of creating adaptive training and learning systems to improve the quality and speed of competence growth of IT-companies’ personnel. Reviewed learning and training systems structures and main differences. Reviewed existing top learning and training systems and selected two of them – Explore Gate and Forma LMS – to be basically tested to explore the common requirements, functionality and not resolved issues. Investigated frameworks for IT competences and skills, exactly e-CF (European e-Competence Framework) and SFIA (Skills Framework for the Information Age). These frameworks are proposed to be used in training system for IT companies’ personnel. Reviewed architectures and models that can be used for adaptive learning and training systems. Proposed ontology of adaptive training system for IT-companies personnel and algorithm to create the training track for employee according to the selected competence, current level of knowledge and skills, aim level of competence and preferences.
Advanced thermodynamic analysis on exergy flow grafs
(NTU "KhPI", 2017) Nikulshin, Vladimir; Denysova, Alla; Denysova, Anastasiia
In the paper has been proposed f general approach for thermodynamic analysis of systems with arbitrary structures. Method was based on construction and analysis of a new type of exergy- topological model – exergy flow graph and allowed to improve the efficiency of energy intensive systems. The efficiency improving is very important problem and the main way of it solving was through thermodynamic analysis and optimization. It was shown that the processes taking place in the complex energy intensive systems were characterized by mutual transformation of quality different power resources. It has been found that one of the most effective mathematical methods used for exergetic analysis and optimization was the method the method of graph theory. The benefit of graph models can also be demonstrated by its flexibility and vide varieties of possible applications. It has been demonstrated the application of suggested approach for thermodynamic analysis of gas-turbine installation. It has been found that the degree of thermodynamic perfection of turbines and turbocompressors are sufficiently high. Usually, the bigger was the difference between average parameters of the working fluid and the environment, the smaller was the exergy losses. The same situation was also true for heat exchangers. High temperature level in regenerative refrigerator, as compared with intermediate refrigerator, give a higher degree of thermodynamic perfection of the heat exchanger. Exergy losses in other elements of the system were caused by dissipation of the flow transport in the pipelines or by mechanical losses. It has been found that for the system as a whole the degree of thermodynamic perfection was less than the same characteristics for any element of the system in result of the mutual influence of the element on the other in the system.
Application of a MFC1000AcR frequency converter in a marine vessel propulsion system
(NTU "KhPI", 2017) Załęski, J.; Kapusta, P.; Młodzikowski, P.; Bilonozhko, V. V.; Kopchak, B. L.
Practical application of a set of four power electronic frequency converters of MFC1000AcR type with total capacity of 1.4 MW to power four motors of main and maneuvering drives of a ship has been considered, which makes it possible to displace, manoeuvre and automatically maintain the location of the ship according to GPS signals. Each of the MFC1000AcR converters is a four-quadrant modern modular device with liquid cooling. Climatic, mechanical and electromagnetic compatibility tests of frequency converters in the control system of a ship, conducted in accordance with the described procedure in extensive hours-long testing with varying load sample that reflects the research expedition, have displayed full compliance of all the requirements.
An approach to forming dashboards for business processes state analysis
(НТУ "ХПІ", 2017) Kopp, A. M.; Orlovskyi, D. L.; Kuka, D. O.
There have been considered basic features of dashboards, their place and role in business process management concept, considered basic dashboards types, considered various recommendations of dashboards construction, and also considered basic visualization tools such as bar and line graphs, pie and scatter charts, bullet graphs and dials. An approach to formation of dashboards, used for the analysis of product supply business process state, has been proposed. Therefore, a set of performance indicators and a related system of scales have been defined. In order to solve the problem of dashboard design which means definition of number, type and place of visualization tools, mathematical models of unbounded and continuous knapsack problems have been applied. As a result of the proposed approach application, a prototype of a dashboard used for the analysis of product supply business process state has been developed.
"ART WAY-2017". Хроніка подій
(НТУ "ХПІ", 2017) Красіков, Михайло Михайлович
Automation of the control processes of the refrigeration units condensers
(НТУ "ХПІ", 2017) Bukaros, Valeriya Mykolayevna; Onishchenko, Oleg Anatolyevych; Naleva, Galyna Vasylivna; Bukaros, Andrii Yuriyovych
In the article energy efficient ways of the condensing pressure (temperature) control in refrigeration units for various purposes are considered. The comparative analysis of the circuit solutions of the condensing temperature regulators for air cooling condensers is conducted with simulation methods. Modeling of the single-phase system of the regulator pulse-phase control triac HPC1/4 showed that this system has a low power factor. The feasibility of the condensing temperature regulators implementation on the basis of the three-phase frequency converter with DC chain is substantiated for the low and medium cooling capacity refrigeration units. The disadvantages of the existing systems of the condensing pressure stabilization of the refrigeration units water cooling condensers are highlighted. The research of two proposed control systems of the water-cooled condensers of the medium and high cooling capacity refrigeration units is conducted. It is established that the using of the principles of partial invariance to main disturbances with elements of the nonlinear correction can improve the energy efficiency of refrigeration units. Also it is provided by modeling the processes in the shell and tube capacitor KTP-300 of the ship refrigeration unit that the using of variable structure systems further improves the dynamic quality of control processes with large fluctuations of the heat loads.
Case study of incorrectly used current harmonics mitigation system
(NTU "KhPI", 2017) Volkov, I. V.; Podolnyi, S. V.
The paper describe a real case of a failed power transformer due to incorrectly applied active current harmonics mitigation system (active filter) for VFD drives. The used mitigation system injected high frequency current spectrum into the power system what led to overheating in the system components mainly due to skin effect. The possibility of such a problem should always be taken into account when choosing a specific scheme of the active filter.
Comparative analysis of univariate time series modeling and forecasting techniques for short-term unstable data
(НТУ "ХПІ", 2017) Marynych, Tetyana Olexandrivna; Nazarenko, Lyudmyla Dmytrivna; Khomenko, Nataliya Hryhorivna
The article summarizes the international experience in univariate time series modeling approaches and methodology. It aims to make empirical assessment of their relevance and forecasting power for short sample volatile data with numerous aberrant observations and structural breaks with the help of the time series R packages. The findings revealed the pitfalls of outliers’ neglection including stationarity and model misspecification, biased parameter estimates, deterioration of residuals’ properties and prediction accuracy of the models. Empirical research demonstrated the outperformance of the outlier detection methods versus robust approaches that use smaller weights for aberrant observations. We tested a method of improving the forecasting power of the ARMA models by proper identification of hidden patterns and incorporation of additional information about extraordinary events into the model. We also considered frequency domain and nonparametric methods including exponential smoothing, seasonal and trend-cycle decomposition, structural and neural networks models to make comparative forecasting diagnostics. The findings showed slightly worse accuracy of the exponential smoothing and structural state-space models for short prediction horizons and their outperformance for longer forecasting periods. Neural networks showed outstanding in-sample approximation but poor out-of-sample quality. We recommend further studying of the Bayesian regime switching models that have proven to be a comprehensive way to explore hidden patterns in data, as well as dynamic factor multivariate models that can improve explanatory and forecasting power of the time series models in various applications.
Computer modeling of new drugs based on the methods of swarm intelligence and immune network modeling
(НТУ "ХПІ", 2017) Samigulina, G. A.; Massimkanova, Zh. A.
The article is devoted to the development of an intellectual information system for conducting scientific research and for predicting the dependence "structure-property/activity" of new drugs based on algorithms of swarm intelligence and immune-network modeling. Selection of informative descriptors is carried out on the basis of a multi-algorithmic approach, which allows selecting the algorithm in which the generalization error will be minimal after immune network modeling. Algorithms are distinguished by the presence of customizable parameters that affect the productivity of an intelligent information system.
The concept of an architectural solution for the service intended to build an enterprise strategy map
(НТУ "ХПИ", 2017) Moskalenko, Valentina Volodymyrovna; Berezenko, Yuriy Stanislavovich
The article examines an architectural solution of a software application for building an enterprise strategy map. It gives a short review of existing software products at the IT-market, which is used in strategic enterprise performance management. Much attention is dedicated to the separate stage of the development program formation, i.e. strategy map building. For building such a map it is proposed to formulate general enterprise strategic goals on the basis of an analysis of the development direction priorities and then check them for their feasibility. Next, the selected goals are decomposed into goals by the perspectives in accordance with the balanced storecard. The goals are analyzed for the impact of key success factors. Based on the success factors, bunch of strategic key performance indicators are formed. The paper examines problems that need to be solved at each stage of the map building, and proposes mathematical methods for their solving such as the analytic hierarchy process, the trajectory approach in conjunction with the system optimization and the cognitive analysis. The author suggests using service-oriented architecture for EPM-system implementation and microservice architecture for the implementation of the strategic map application. As result the study identifies four services that implement the following business functions: an identification of priority directions for the enterprise development and general strategic goals; a verification of the feasibility of common strategic goals and planned targets formation; a definition of the goals by the perspectives, KSF definition and building of the strategy map; a definition of KPI by the perspectives. The structure of the software application is presented as a component diagram.
Decreasing of threats to the condition of environment of Turkmenistan at the hydrocarbon and mineral raw materials mining
(NTU "KhPI", 2017) Ginkul, A. P.; Krivileva, S. P.
The main ecological problems of Turkmenistan caused by the use of environmentally hazardous methods of exploration and production of hydrocarbon and mineral raw materials are analyzed. The main methods used in Turkmenistan for the extraction and transportation of oil and gas and the environmental consequences of their use are listed. The main causes of the deterioration of the natural environment of Turkmenistan during the extraction of hydrocarbons on the shelf of the Caspian Sea have been identified. Technological innovation in the exploration and production sector has equipped the industry with the equipment and practices necessary to continually increase the production of natural gas to meet rising demand. Hense formulated the prior areas for further rising of environmental safety in the oil and gas sector and extraction of mineral raw materials: wide introduction into the production of new innovative energy-efficient technologies and the latest achievements of the world science in the entire production cycle - from geologic explorations, development and development of production to transportation, storage and use of natural resources.
Design of power turbine flow path of small aeroengine
(NTU "KhPI", 2017) Khomylev, S.; Riznyk, S.; Karpenko, A.
An approach to the design of a turbine flow part is presented. The approach is based on the analysis of design and operational constraints, on the definition of areas of engineering solutions that ensure the achievement of defined parameters with an acceptable technical risk. The considered turbine is a Power Turbine (PT) of a small aviation gas-turbine engine. The PT is an uncooled single-stage axial turbine with a shrouded rotor. Before PT there is a diffuser Inter-Turbine Duct from the high-pressure turbine. The constraints, assumptions and criterion of effective designing of the PT flow path at the stage of one-dimensional design (based on the mean diameter) are considered. They include the constraints on the Inter-Turbine Duct expansion, on the mechanical loads of rotor blades, the flow parameters at the outlet of the turbine, and others. The solution scope defined as region in a "middle diameter – blade span ratio" and a rotational speed coordinates. For designed flow path the blade rows was profiled and verifying 3D calculations was carried out. 1D calculations performed by in-house code. For 3D calculation CFD code FlowER used. According numerical results PT flow path ensure specified parameters. The works were carried out within the Framework Programme 7 (FP7) EU project "Efficient Systems and Propulsion for Small Aircraft" (ESPOSA) – under the Grant Agreement number №: ACP1-GA-2011-284859.
Development of software solution for building route of a orders group delivery in presence of time constraints ..
(НТУ "ХПИ", 2017) Dvukhglavov, Dmytro Eduardovych; Kulynych, Vadim Evgenijovych
The problem of determining route of visiting several points is considered. The task differs from known ones that time for arrival at each point is specified. The tasks of these class are solved in courier delivery services of various goods types. Basis of proposed algorithm for determining delivery route is algorithm for forming the route tree used matrix, which specify distances between delivery points, which is supplemented by checking conditions for possibility of visiting points, according to defined delivery time vector. Various criteria for selecting vertices for inclusion in route are considered. During developing software that implements proposed algorithm, used parallel computation methods that allow to obtain a solution for problem of sufficiently large dimension at acceptable time.
Digital economy and society in Hungary and Ukraine
(НТУ "ХПІ", 2017) Szabolcs, Nagy
We live in the Digital Age in which both economy and society have been transforming significantly. The Internet and the connected digital devices are inseparable parts of our daily life and the engine of the economic growth. In this paper, first I analyzed the status of digital economy and society in Hungary, then compared it with Ukraine and made conclusions regarding the future development tendencies. Using secondary data provided by the European Commission I investigated the five components of the Digital Economy and Society Index of Hungary. I performed cross country analysis to find out the significant differences between Ukraine and Hungary in terms of access to the Internet and device use including smartphones, computers and tablets. Based on my findings, I concluded that Hungary is more developed in terms of the significant parameters of the digital economy and society than Ukraine, but even Hungary is an emerging digital nation. Considering the high growth rate of Internet, tablet and smartphone penetration in both countries, I expect faster progress in the development of the digital economy and society in Hungary and Ukraine.
Economic feasibility study of expediency of establishment of solar modules in the private household
(НТУ "ХПІ", 2017) Shokarov, Dmitrо; Chorna, Viktoriia; Bogodist, Kseniia
The question of rather economic feasibility of use of solar modules in a private household as the power supply of household appliances is considered under the conditions of use of "a green tariff" in this article. The results of the calculations of the greatest possible volume of development of electric energy by solar modules for a year are given. On the basis of a method of discounting return on the investment in a photo-electric system is defined.
The effects of lead rubber bearing (LRB) systems on the earthquake response of high-rise building
(НТУ "ХПІ", 2017) Doğan, Sağlam; Barış, Sevim
The base isolation systems set sight on mitigating the effects of forces triggered by an earthquake through neutralizing the interaction between building and ground by means of earthquake isolators. This study aims to determine the effects of base isolation systems on the earthquake response of a high-rise building. In the content of the study firstly the high-rise building is designed for different sized isolators under the framework of earthquake isolator technique, and then scrutinize the earthquake response of the same building by comparing its configurations equipped with different sized isolators and fixed support. The building has 122.5 m tall and 35 stories and 16x20 m² habitable inner space, which is properly considered in line with vertical settlement movement widely seen in the world metropolises, is punctiliously designed and diffusively probed within the concept of fixed support. During the following stage, 2 different diameter size of 21 cm. tall lead rubber bearings are added to the structure, its unpredictable behaviors and forces transferred to the building under 1999 Kocaeli Earthquake highlighted from the study that LRB systems provide better structural response to building compared to fixed system, and then the critical parameters such as acceleration, lateral displacements, base and shear forces are compared with each other.