Computer Modeling: Analysis, Control, Optimization最新文献

{"title":"Application of statistical hypotheses test method for evaluation of investment investment options in the production field","authors":"V.M. Kosariev","doi":"10.32434/2521-6406-2020-1-7-10-19","DOIUrl":"https://doi.org/10.32434/2521-6406-2020-1-7-10-19","url":null,"abstract":"The use of foreign and domestic financial and material resources is one of the components of the modern concept of economic and social development. The efficient use of these resources is known to be hampered not only by the traditional discrepancy between the amount of resources available and required, but also by the inefficient management of their use. This management is aimed at solving problems: organization of work; control over the targeted use of funds; reasonable allocation of resources; resource investment planning; scientifically sound forecasting of the implementation of decisions made at the planning stage. The article is devoted to solving the last of these problems. In this paper, using the principle of compromise and the minimax method, we propose a variant of applying the method of testing statistical hypotheses to assess the implementation of investment options in the field of production for more informed decision-making at the planning stage of enterprise development in uncertainty. The task of modeling is to determine and estimate the probabilities of implementation of planned investments aimed at promoting the strategic development of the enterprise in case of intersection of hypotheses about the actual distribution of public and private sources of investment in conditions of random and antagonistic uncertainty. It is investigated that to assess the feasibility of investment options available to economic development management bodies, as well as in the relevant statistical offices, available information on the planned distribution of existing or expected investment, i.e. statistical information on characteristics, is the information basis for solving this. task. The probability of forecasting the implementation of each of the observed options is estimated by calculating the probability of making the right decisions and decision-making errors when considering the distribution of investments that are planned for each option of their use. The results of the method contribute to the improvement of management of investments in the sphere of production in difficult real conditions. Keywords: distribution of investment volumes, method of testing of statistical hypotheses, stochastic model of forecasting of phenomena, reliability of realization of planned volumes of investments, compromise determination.","PeriodicalId":220928,"journal":{"name":"Computer Modeling: Analysis, Control, Optimization","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116106379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Some peculiarities of computer modeling of a bending of elastic circular arch with notch","authors":"V. Olevskyi, O. Olevskyi","doi":"10.32434/2521-6406-2019-5-1-43-53","DOIUrl":"https://doi.org/10.32434/2521-6406-2019-5-1-43-53","url":null,"abstract":"","PeriodicalId":220928,"journal":{"name":"Computer Modeling: Analysis, Control, Optimization","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121466119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization In A Finite-Dimensional Euclide Space","authors":"A. Kosolap","doi":"10.32434/2521-6406-2020-1-7-20-28","DOIUrl":"https://doi.org/10.32434/2521-6406-2020-1-7-20-28","url":null,"abstract":"In this paper, optimization models in Euclidean space are divided into four complexity classes. Ef-fective algorithms have been developed to solve the problems of the first two classes of complexity. These are the primal-dual interior-point methods. Discrete and combinatorial optimization problems of the third complexity class are recommended to be converted to the fourth complexity class with continuous change of variables. Effective algorithms have not been developed for problems of the third and fourth complexity classes, with the exception of a narrow class of problems that are unimodal. The general optimization problem is formulated as a minimum (maximum) objective function in the presence of constraints. The complexity of the problem depends on the structure of the objective function and its feasible region. If the functions that determine the optimization model are quadratic or polynomial, then semidefinite programming can be used to obtain estimates of so-lutions in such problems. Effective methods have been developed for semidefinite optimization problems. Sometimes it’s enough to develop an algorithm without building a mathematical model. We see such an example when sorting an array of numbers. Effective algorithms have been devel-oped to solve this problem. In the work for sorting problems, an optimization model is constructed, and it coincides with the model of the assignment problem. It follows from this that the sorting problem is unimodal. Effective algorithms have not been developed to solve multimodal problems. The paper proposes a simple and effective algorithm for the optimal allocation of resources in mul-tiprocessor systems. This problem is multimodal. In the general case, for solving multimodal prob-lems, a method of exact quadratic regularization is proposed. This method has proven its compara-tive effectiveness in solving many test problems of various dimensions. Keywords: Euclidean space, optimization, unimodal problems, multimodal problems, complexity classes, numerical methods.","PeriodicalId":220928,"journal":{"name":"Computer Modeling: Analysis, Control, Optimization","volume":"1075 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116024564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mathematical modeling of the grinding process with simultaneous drying of the material in a centrifugal mill","authors":"О.V. Titova, V. I. Kravets, N. Minakova, E. V. Chernetsky, О.М. Gnatko","doi":"10.32434/2521-6406-2019-5-1-70-74","DOIUrl":"https://doi.org/10.32434/2521-6406-2019-5-1-70-74","url":null,"abstract":"","PeriodicalId":220928,"journal":{"name":"Computer Modeling: Analysis, Control, Optimization","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128217968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recognition and generation of QR/bar codes in mobile applications","authors":"A. Nikonenko, L. Korotka","doi":"10.32434/2521-6406-2019-5-1-36-42","DOIUrl":"https://doi.org/10.32434/2521-6406-2019-5-1-36-42","url":null,"abstract":"","PeriodicalId":220928,"journal":{"name":"Computer Modeling: Analysis, Control, Optimization","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116272147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The method of fuzzy determination of the concentration of heavy metals in the atomic absorption spectral analysis of bottom sediments","authors":"Yu. B. Olevska, V. Olevskyi, K. Timchy, О.V. Olevskyi","doi":"10.32434/2521-6406-2020-1-7-29-36","DOIUrl":"https://doi.org/10.32434/2521-6406-2020-1-7-29-36","url":null,"abstract":"Due to the technogenic impact on the biosphere and its components, a significant amount of heavy metals and radionuclides ends up in the environment. One of the main directions for improving the ecological components of environmental safety is the biotransformation of bottom sediments of reservoirs containing heavy metals, with the help of vermiculture, into biologically safe organic fertilizer. Assessment of the concentration of heavy metals in bottom sediments is an urgent task, the solution of which will allow preserving the natural environment, improving the condition of soils and, as a result, human health. The problem of using bottom deposits in this case is the accuracy of determining the content of various heavy metals in them, which affect the vital activity of earthworms. The gross and mobile forms of heavy metals in experimental substrates can be most accurately determined by atomic absorption spectral analysis. Atomic absorption analysis is a method of analytical chemistry based on the selective absorption of electromagnetic radiation of a certain wavelength by neutral atoms of the element being determined free of all molecular bonds. In the process of absorption, an electron moves from the main energy level to a higher one as a result of photon excitation. In this case, the intensity of the exciting light of a given frequency decreases. Accurate quantification is often hampered by significant matrix interference and non-uniform analyte distribution. To achieve the accuracy and reliability of the method required for vermicultivation, this work proposes a modification of the analysis method by applying fuzzy modeling of the experimental results. From a mathematical point of view, the process of constructing a calibration graph can be implemented using the procedure for constructing a fuzzy scale in the method for decoding the weight of proteins during electrophoresis. An algorithm is described for determining the fuzzy concentration of a metal from the atomic absorption signal data, followed by defuzzification of the obtained fuzzy concentration for analysis and practical use. Keywords: fuzzy modeling, spectral analysis, heavy metals.","PeriodicalId":220928,"journal":{"name":"Computer Modeling: Analysis, Control, Optimization","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127816294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The use of a full-wave amplifying rectifier without diodes on operational amplifiers in an automated testing system on a tensile testing machine","authors":"A. Shulhin, D. Losikhin","doi":"10.32434/2521-6406-2020-1-7-70-74","DOIUrl":"https://doi.org/10.32434/2521-6406-2020-1-7-70-74","url":null,"abstract":"The article discusses the problem of transformation of measuring signal of differential transformer converter of universal testing machines for further processing by microprocessor controller. In order to automate the testing process, it is necessary to collect, process and transmit the measured data to an automated workplace using a microprocessor controller. Due to the fact that usually the secondary windings of the differential transformer converters produce an alternating voltage of very small magnitude, such a measurement signal cannot be processed with the help of modern microprocessor controllers without conversion. Since the analog-to-digital converter of the microprocessor controller cannot operate with alternating voltage, it becomes necessary to rectify and amplify the measuring signal. For low voltages (less than 0.6 V), the use of conventional resistor-diode rectifiers becomes impossible and there is a need for other methods of rectifying alternating current. It is proposed to use full-wave active rectifiers without diodes on operational amplifiers for conversion of the measuring signal of differential transformer converters, the main disadvantages of diode rectifiers and advantages of rectifiers on operational amplifiers are considered. The biggest advantage of a rectifier proposed for use in an automated testing system is the ability to simultaneously rectify and amplify the measurement signal with the required precision, allowing it to be processed by most modern microprocessor controllers. For the first time, an automated testing system on a tensile machine was developed using an active full-wave voltage rectifier on operational amplifiers without the use of diodes. The circuit shown in the article makes it possible to convert the signal of a differential transformer converter for further processing using the Arduino microcontroller platform. An amplifying active full-wave voltage rectifier without diodes on operational amplifiers can be used to modernize testing or measurement equipment containing a differential transformer transducer of a measuring signal. The developed electrical circuit of the rectifier was applied to automate the process of testing on the breaking machine of model P-0.5. Keywords: differential transformer converter, operational amplifier, rectifier, measuring signal converter, tensile testing machine, automated test system.","PeriodicalId":220928,"journal":{"name":"Computer Modeling: Analysis, Control, Optimization","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129350086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A method for solving problems of bending rod optimization taking corrosion into account","authors":"D. Zelentsov, O. Denysiuk","doi":"10.32434/2521-6406-2019-5-1-15-22","DOIUrl":"https://doi.org/10.32434/2521-6406-2019-5-1-15-22","url":null,"abstract":"","PeriodicalId":220928,"journal":{"name":"Computer Modeling: Analysis, Control, Optimization","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131620482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of an analytical model for calculating and optimizing vibroacoustic loading of technological equipment pipelines","authors":"O. Oliynyk, Y. Taranenko","doi":"10.32434/2521-6406-2019-5-1-54-62","DOIUrl":"https://doi.org/10.32434/2521-6406-2019-5-1-54-62","url":null,"abstract":"","PeriodicalId":220928,"journal":{"name":"Computer Modeling: Analysis, Control, Optimization","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132202710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Determination of optimal number and places of location of charging station for electric vehicles inside the city","authors":"L. Koriashkina, A. R. Belyaev","doi":"10.32434/2521-6406-2019-5-1-23-29","DOIUrl":"https://doi.org/10.32434/2521-6406-2019-5-1-23-29","url":null,"abstract":"","PeriodicalId":220928,"journal":{"name":"Computer Modeling: Analysis, Control, Optimization","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132135088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}