Systems of complex estimation (CO) based on a dichotomous tree of criteria and a set of criteria convolution matrices (generalized criteria) are widely used in the evaluation of a wide variety of ob-jects. Purpose of the study. To build a CO system for a given set of criteria, you need to solve two problems: 1. To choose the structure of the dichotomous tree of criteria. 2. To define matrix convolutions of pairs of criteria (generalized criteria) at each vertex of the tree (except for hanging ones). The article deals with the second problem, i.e. the problem of determining matrices the criteria convolution. In practice, this task is often solved based on expert opinions. Materials and methods. Let us assume that there are a set of options (a variant is a set of criteria estimates) and experts have defined complex estimates for each option from this set. The task is to define matrix convolu-tions at each vertex of the tree such that the CO of each variant in the resulting system CO is equal to the EXPERT estimate. The paper defines a class of unified CO mechanisms that meet the following conditions: 1. All matrices of the unified complex estimation mechanism have the same dimension. 2. For any matrix all rows are different and all columns are different. 3. All matrices are monotonous in rows and columns; 4. If all the variant scores are equal to a certain score, then the complex score is equal to this score. Results. Two cases are considered. In the first case, experts can give estimates of options with any set of criteria estimates. In the second case, experts can give a CO of only complete options, that is, options that contain estimates of all criteria. For the first case, an efficient algorithm with an estimate of computational complexity of the order of lm2 is proposed, where l is the number of crite-ria, and m is the number of gradations of the rating scale. The algorithm makes significant use of the 4 property of unified mechanisms. For the second case, we propose a method for solving the problem by constructing “top-down” matrices, i.e. constructing a matrix for the root vertex, then for adjacent ones, and so on. Conclu-sion. Thus, the paper proposes algorithms for the synthesis of unified mechanisms for complex eva-luation, in which the number of required expert options is minimal.
{"title":"METHOD OF SYNTHESIS OF THE INTEGRATED ASSESSMENT SYSTEM","authors":"V. Burkov, I. Burkova, A. Shchepkin","doi":"10.14529/ctcr200407","DOIUrl":"https://doi.org/10.14529/ctcr200407","url":null,"abstract":"Systems of complex estimation (CO) based on a dichotomous tree of criteria and a set of criteria convolution matrices (generalized criteria) are widely used in the evaluation of a wide variety of ob-jects. Purpose of the study. To build a CO system for a given set of criteria, you need to solve two problems: 1. To choose the structure of the dichotomous tree of criteria. 2. To define matrix convolutions of pairs of criteria (generalized criteria) at each vertex of the tree (except for hanging ones). The article deals with the second problem, i.e. the problem of determining matrices the criteria convolution. In practice, this task is often solved based on expert opinions. Materials and methods. Let us assume that there are a set of options (a variant is a set of criteria estimates) and experts have defined complex estimates for each option from this set. The task is to define matrix convolu-tions at each vertex of the tree such that the CO of each variant in the resulting system CO is equal to the EXPERT estimate. The paper defines a class of unified CO mechanisms that meet the following conditions: 1. All matrices of the unified complex estimation mechanism have the same dimension. 2. For any matrix all rows are different and all columns are different. 3. All matrices are monotonous in rows and columns; 4. If all the variant scores are equal to a certain score, then the complex score is equal to this score. Results. Two cases are considered. In the first case, experts can give estimates of options with any set of criteria estimates. In the second case, experts can give a CO of only complete options, that is, options that contain estimates of all criteria. For the first case, an efficient algorithm with an estimate of computational complexity of the order of lm2 is proposed, where l is the number of crite-ria, and m is the number of gradations of the rating scale. The algorithm makes significant use of the 4 property of unified mechanisms. For the second case, we propose a method for solving the problem by constructing “top-down” matrices, i.e. constructing a matrix for the root vertex, then for adjacent ones, and so on. Conclu-sion. Thus, the paper proposes algorithms for the synthesis of unified mechanisms for complex eva-luation, in which the number of required expert options is minimal.","PeriodicalId":338904,"journal":{"name":"Bulletin of the South Ural State University. Ser. Computer Technologies, Automatic Control & Radioelectronics","volume":"161 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134005830","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}
The work is devoted to the problem of mathematical modeling and search for optimal control of the dynamics of the insulin-glucose balance in human blood, represented by a nonsmooth sys-tem of differential equations with a constant delay. Aim. This study is aimed at developing and numerically solving the problem of optimal control of the glycemic profile in patients with type 1 di-abetes mel¬litus by insulin therapy, based on the optimality conditions for nonsmooth systems with a constant delay in the phase variable. Methods. The general research technique of the problem under study is based on the mathematical theory of optimal control, the theory of numerical methods, the theory of differential equations with a nonsmooth right-hand side and with a lagging argument. When implementing the software package, the methods of object-oriented design are used. Results. In this study, on the basis of the initial dynamic model proposed by N.A. Shirokova, the problem of optimal control of the dynamics of glycemic regulation in patients with type 1 diabetes mellitus with a non¬smooth right side and a constant delay in the phase variable is constructed. On the basis of the necessary optimality condition obtained for the constructed optimal control problem, algorithmic and software tools have been developed, with the help of which optimal programs are obtained, and their meaningful interpretation is presented. Conclusion. The results obtained on the basis of the software implementation of numerical algorithms of the developed nonsmooth problem of optimal control of the insulin-glucose balance with a constant lag in the phase variables, make it possible to obtain the data that are necessary for monitoring the situation regarding the change in the glycemic profile, for predicting diabetes mellitus and choosing an effective treatment.
该工作致力于数学建模和寻找人类血液中胰岛素-葡萄糖平衡动力学的最佳控制问题，由具有恒定延迟的非光滑微分方程系统表示。的目标。本研究旨在基于相位变量具有恒定延迟的非光滑系统的最优性条件，开发并数值解决胰岛素治疗对1型糖尿病患者血糖谱的最优控制问题。方法。所研究问题的一般研究方法是基于最优控制的数学理论、数值方法理论、非光滑右侧微分方程理论和滞后参数理论。在软件包的实现过程中，采用了面向对象的设计方法。结果。本研究在na . a . Shirokova提出的初始动力学模型的基础上，构造了右侧不光滑且相位变量为恒定延迟的1型糖尿病患者血糖调节动力学的最优控制问题。在得到所构造的最优控制问题的必要最优性条件的基础上，开发了求解最优控制问题的算法和软件工具，并给出了最优控制问题的有意义的解释。结论。所开发的具有恒定相位滞后的胰岛素-葡萄糖平衡最优控制的非光滑问题的数值算法的软件实现所获得的结果，可以获得监测血糖谱变化情况、预测糖尿病和选择有效治疗方法所必需的数据。
{"title":"OPTIMAL CONTROL OF GLYCEMIA REGULATION DYNAMICS IN PATIENTS WITH TYPE I DIABETES MELLITUS","authors":"I. Bolodurina, Yu.P. Ivanova, L. M. Antsiferova","doi":"10.14529/ctcr200415","DOIUrl":"https://doi.org/10.14529/ctcr200415","url":null,"abstract":"The work is devoted to the problem of mathematical modeling and search for optimal control of the dynamics of the insulin-glucose balance in human blood, represented by a nonsmooth sys-tem of differential equations with a constant delay. Aim. This study is aimed at developing and numerically solving the problem of optimal control of the glycemic profile in patients with type 1 di-abetes mel¬litus by insulin therapy, based on the optimality conditions for nonsmooth systems with a constant delay in the phase variable. Methods. The general research technique of the problem under study is based on the mathematical theory of optimal control, the theory of numerical methods, the theory of differential equations with a nonsmooth right-hand side and with a lagging argument. When implementing the software package, the methods of object-oriented design are used. Results. In this study, on the basis of the initial dynamic model proposed by N.A. Shirokova, the problem of optimal control of the dynamics of glycemic regulation in patients with type 1 diabetes mellitus with a non¬smooth right side and a constant delay in the phase variable is constructed. On the basis of the necessary optimality condition obtained for the constructed optimal control problem, algorithmic and software tools have been developed, with the help of which optimal programs are obtained, and their meaningful interpretation is presented. Conclusion. The results obtained on the basis of the software implementation of numerical algorithms of the developed nonsmooth problem of optimal control of the insulin-glucose balance with a constant lag in the phase variables, make it possible to obtain the data that are necessary for monitoring the situation regarding the change in the glycemic profile, for predicting diabetes mellitus and choosing an effective treatment.","PeriodicalId":338904,"journal":{"name":"Bulletin of the South Ural State University. Ser. Computer Technologies, Automatic Control & Radioelectronics","volume":"130 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132519354","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}
It is shown that in connection with the ongoing financial and economic crises in the world, as well as a sharp aggravation of competition in the international markets of industrial products and a number of other factors, the issues of increasing the efficiency of industrial enterprises and corporations in the regions of the country need a more comprehensive and comprehensively thought-out justifica-tion. Purpose of the study. It is advisable to develop a set of scientific provisions and recommenda-tions for the analysis of the activities of industrial enterprises in the regions, which would contribute to the purposeful development of the economy of the constituent entities of the Russian Federation in modern business conditions. Materials and methods. The materials and methods used are out-lined by the content of theoretical developments and practical experience obtained in the process of researching the development of the economy and industry of the regions of the Russian Federation. Results. The list of scientific provisions and recommendations for increasing the effectiveness of the influence of state authorities of the constituent entities of the Russian Federation on the develop-ment of industry and economy of the country's regions has been substantiated. The composition of methods of state regulation in the economy and industry of the regions is presented, a list of the main tasks of the industrial and economic block for state authorities of the constituent entities of the Russian Federation, as well as the functions and mechanisms of their implementation, is pre-sented. Conclusion. The development of the economy and industry of the regions of Russia should be carried out using the scientific provisions and recommendations presented in this article, which will allow, when forming management decisions, to take into account factors and justifications that were often unused before.
{"title":"THE INFLUENCE OF PUBLIC AUTHORITIES OF THE CONSTITUENT ENTITIES OF THE RUSSIAN FEDERATION ON THE DEVELOPMENT OF INDUSTRIAL ENTERPRISES AND CORPORATIONS","authors":"O. Loginovskiy, A. Khaldin, A. Shinkarev","doi":"10.14529/ctcr200414","DOIUrl":"https://doi.org/10.14529/ctcr200414","url":null,"abstract":"It is shown that in connection with the ongoing financial and economic crises in the world, as well as a sharp aggravation of competition in the international markets of industrial products and a number of other factors, the issues of increasing the efficiency of industrial enterprises and corporations in the regions of the country need a more comprehensive and comprehensively thought-out justifica-tion. Purpose of the study. It is advisable to develop a set of scientific provisions and recommenda-tions for the analysis of the activities of industrial enterprises in the regions, which would contribute to the purposeful development of the economy of the constituent entities of the Russian Federation in modern business conditions. Materials and methods. The materials and methods used are out-lined by the content of theoretical developments and practical experience obtained in the process of researching the development of the economy and industry of the regions of the Russian Federation. Results. The list of scientific provisions and recommendations for increasing the effectiveness of the influence of state authorities of the constituent entities of the Russian Federation on the develop-ment of industry and economy of the country's regions has been substantiated. The composition of methods of state regulation in the economy and industry of the regions is presented, a list of the main tasks of the industrial and economic block for state authorities of the constituent entities of the Russian Federation, as well as the functions and mechanisms of their implementation, is pre-sented. Conclusion. The development of the economy and industry of the regions of Russia should be carried out using the scientific provisions and recommendations presented in this article, which will allow, when forming management decisions, to take into account factors and justifications that were often unused before.","PeriodicalId":338904,"journal":{"name":"Bulletin of the South Ural State University. Ser. Computer Technologies, Automatic Control & Radioelectronics","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114777409","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}
ditions, the values of measurement errors , 1, , k v k N are unknown (uncontrolled). A priori information about measurement errors is formalized by choosing a hypothesis about the properties of errors k v . The following hypotheses are traditional. 1. The measurement errors k v are random and given by probability density function with known parameters. 2. The measurement errors k v are uncertain quantities: k v V , where V is a given convex set of their possible values. Acceptance of the hypothesis about the probabilistic nature of measurement errors makes it possible to formulate the problem within the framework of the stochastic approach as the problem of finding the optimal estimate in the mean square sense and to use statistical methods [2]. The most common is the use of the least-squares method (LS) [1, 2], i.e. minimizing a function
条件下，测量误差，1，，k v k N的值是未知的(不受控制)。关于测量误差的先验信息是通过选择一个关于误差kv属性的假设来形式化的。以下假设是传统的。1. 测量误差k v是随机的，由已知参数的概率密度函数给出。2. 测量误差k v是不确定的量:k v v，其中v是它们可能值的给定凸集。接受关于测量误差的概率性质的假设，使得在随机方法的框架内将问题表述为在均方意义上寻找最优估计的问题并使用统计方法成为可能[2]。最常见的是使用最小二乘法(LS)[1,2]，即最小化一个函数
{"title":"ADAPTIVE GUARANTEED ESTIMATION OF A CONSTANT SIGNAL UNDER UNCERTAINTY OF MEASUREMENT ERRORS","authors":"D. Khadanovich, V. Shiryaev","doi":"10.14529/ctcr200403","DOIUrl":"https://doi.org/10.14529/ctcr200403","url":null,"abstract":"ditions, the values of measurement errors , 1, , k v k N are unknown (uncontrolled). A priori information about measurement errors is formalized by choosing a hypothesis about the properties of errors k v . The following hypotheses are traditional. 1. The measurement errors k v are random and given by probability density function with known parameters. 2. The measurement errors k v are uncertain quantities: k v V , where V is a given convex set of their possible values. Acceptance of the hypothesis about the probabilistic nature of measurement errors makes it possible to formulate the problem within the framework of the stochastic approach as the problem of finding the optimal estimate in the mean square sense and to use statistical methods [2]. The most common is the use of the least-squares method (LS) [1, 2], i.e. minimizing a function","PeriodicalId":338904,"journal":{"name":"Bulletin of the South Ural State University. Ser. Computer Technologies, Automatic Control & Radioelectronics","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127823356","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}
The research is devoted to the problem of the development models of network equipment that precisely reproduce the operation of real equipment by the time characteristics. Aim. This research is aimed at developing a methodology that allows you to quickly obtain models that statistically coincide in the behavior of the selected parameters with real measured equipment on existing open modeling systems. Methods. To obtain the performance parameters and time characteristics of the real equipment, an approach was proposed, which includes experiment planning to compute the characteristics for a wide range of input traffic intensities. fic test sets with the required parameters of time distribution between the packets as well as the scheme of connection through the container services and receiving traffic dumps. The approach does not include the testing of the output queues operation because the goal was to investigate and trans-fer into the model processes, which occur before the frames are placed in the outgoing interface queues. An open-source Omnet++ software was used as a modeling environment. Results. We studied the structure of its existing switch model and identified disadvantages that affect the accuracy and reliability of the results. In addition, we proposed an approach for imple-menting model delay lines based on the interpolation of time parameter tables obtained from real data for the required combination of traffic parameters and inbound interfaces. To test the developed approaches, a test bench on real equipment was assembled, and an experimental research plan was developed. Finally, an automated testing script was implemented according to a given plan. Testing was carried out in the conventional frame switching mode as well as in the switching mode based on OpenFlow tables. In addition, the time characteristics of the intermediate equipment were also obtained in order to take into account their influence on the experimental results. Based on them, a table of parameters was computed for the processing delay line in the model, and the experiment was conducted on the model in Omnet++. Since the obtained samples in the statistical analysis showed the types of distributions that are different from the 3 normal and exponential, the statistical Mann– Whitney U-test was used to compare the mean values. Conclusion. The results obtained at a significance level of 0.05 confirmed the efficiency of this approach for models that more accurately describe the temporal characteristics of the traffic processing in network equipment.
{"title":"Method of Obtaining Generalized Statistical Characteristics of Network Equipment for Creation of Simulation Models","authors":"I. Bolodurina, Y. Ushakov, M. Ushakova","doi":"10.14529/ctcr200301","DOIUrl":"https://doi.org/10.14529/ctcr200301","url":null,"abstract":"The research is devoted to the problem of the development models of network equipment that precisely reproduce the operation of real equipment by the time characteristics. Aim. This research is aimed at developing a methodology that allows you to quickly obtain models that statistically coincide in the behavior of the selected parameters with real measured equipment on existing open modeling systems. Methods. To obtain the performance parameters and time characteristics of the real equipment, an approach was proposed, which includes experiment planning to compute the characteristics for a wide range of input traffic intensities. fic test sets with the required parameters of time distribution between the packets as well as the scheme of connection through the container services and receiving traffic dumps. The approach does not include the testing of the output queues operation because the goal was to investigate and trans-fer into the model processes, which occur before the frames are placed in the outgoing interface queues. An open-source Omnet++ software was used as a modeling environment. Results. We studied the structure of its existing switch model and identified disadvantages that affect the accuracy and reliability of the results. In addition, we proposed an approach for imple-menting model delay lines based on the interpolation of time parameter tables obtained from real data for the required combination of traffic parameters and inbound interfaces. To test the developed approaches, a test bench on real equipment was assembled, and an experimental research plan was developed. Finally, an automated testing script was implemented according to a given plan. Testing was carried out in the conventional frame switching mode as well as in the switching mode based on OpenFlow tables. In addition, the time characteristics of the intermediate equipment were also obtained in order to take into account their influence on the experimental results. Based on them, a table of parameters was computed for the processing delay line in the model, and the experiment was conducted on the model in Omnet++. Since the obtained samples in the statistical analysis showed the types of distributions that are different from the 3 normal and exponential, the statistical Mann– Whitney U-test was used to compare the mean values. Conclusion. The results obtained at a significance level of 0.05 confirmed the efficiency of this approach for models that more accurately describe the temporal characteristics of the traffic processing in network equipment.","PeriodicalId":338904,"journal":{"name":"Bulletin of the South Ural State University. Ser. Computer Technologies, Automatic Control & Radioelectronics","volume":"163 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121270729","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":"Managdment of a Local Urban Heat Supply System Based on Neural Network Modeling Taking into Account the Weather Forecast","authors":"G. V. Netbay, V. Oniskiv, V. Stolbov, R. Karimov","doi":"10.14529/ctcr200303","DOIUrl":"https://doi.org/10.14529/ctcr200303","url":null,"abstract":"","PeriodicalId":338904,"journal":{"name":"Bulletin of the South Ural State University. Ser. Computer Technologies, Automatic Control & Radioelectronics","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131379273","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}
value of the coordinate of the position of the body in suspension. A mathematical model of the one-dimensional motion of a magnet under the influence of gravity and electromagnetic forces of interaction with a pulsed magnetic field at a known distance at which the current is turned off is developed. Conclusion. It was established experimentally and through computer simulation that the higher the frequency of the pulsations, the more rigid the pulsation amplitude is observed when the body is held and a more stable equilibrium is established. The ripple frequency decreases with increasing mass of the permanent magnet, and there is a critical mass that is no longer held in the electromagnetic field. As the voltage supplied to the coil switch increases, the frequency of the pulsations of the body and the consumed electric power increase, while the duty cycle of the current pulses decreases.
{"title":"Determination of Dynamic Parameters of a Permanent Magnet while I Hold in a Pulse Magnetic Field","authors":"I. Yachikov, V. Shiryaev","doi":"10.14529/ctcr200312","DOIUrl":"https://doi.org/10.14529/ctcr200312","url":null,"abstract":"value of the coordinate of the position of the body in suspension. A mathematical model of the one-dimensional motion of a magnet under the influence of gravity and electromagnetic forces of interaction with a pulsed magnetic field at a known distance at which the current is turned off is developed. Conclusion. It was established experimentally and through computer simulation that the higher the frequency of the pulsations, the more rigid the pulsation amplitude is observed when the body is held and a more stable equilibrium is established. The ripple frequency decreases with increasing mass of the permanent magnet, and there is a critical mass that is no longer held in the electromagnetic field. As the voltage supplied to the coil switch increases, the frequency of the pulsations of the body and the consumed electric power increase, while the duty cycle of the current pulses decreases.","PeriodicalId":338904,"journal":{"name":"Bulletin of the South Ural State University. Ser. Computer Technologies, Automatic Control & Radioelectronics","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125364399","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}
2020. Т. 20, No 3. С. 129–134 129 Introduction The problems of increasing the efficiency of industrial enterprises are now becoming increasingly relevant [1, 2], while the task of optimizing the activity of industrial units and machines is of particular importance. There are a large number of industrial units, the basis of which is the use of energy created by an electric arc. The lining layer present in such units during operation is subjected to thermal and electromagnetic effects created by the arc. A quantitative measure of this effect is the lining wear coefficient (LWC), one of the most important technological characteristics of modern multi-electrode arc furnaces. The most significant effect on the LWC is exerted by the arc power, the distance from the arc axis to the lining, and the applied voltage. In most studies, the influence of the described factors on the LWC is not taken into account. At the same time, heat fluxes affecting all elements of the furnace structure, including the lining, depend on the shape of the arc. The aim of the work is to study this effect and find the parameters that provide optimization of the LWC. To achieve this goal, an algorithm for calculating the shape of arcs in an AC steelmaking furnace has been developed, which will be used to optimize the objective function.
{"title":"Coefficient on the Basis of Control of Three-phase Current Electric Arcs Characteristics","authors":"O. Loginovskiy, E. M. Kostyleva, I. M. achikov","doi":"10.14529/ctcr200314","DOIUrl":"https://doi.org/10.14529/ctcr200314","url":null,"abstract":"2020. Т. 20, No 3. С. 129–134 129 Introduction The problems of increasing the efficiency of industrial enterprises are now becoming increasingly relevant [1, 2], while the task of optimizing the activity of industrial units and machines is of particular importance. There are a large number of industrial units, the basis of which is the use of energy created by an electric arc. The lining layer present in such units during operation is subjected to thermal and electromagnetic effects created by the arc. A quantitative measure of this effect is the lining wear coefficient (LWC), one of the most important technological characteristics of modern multi-electrode arc furnaces. The most significant effect on the LWC is exerted by the arc power, the distance from the arc axis to the lining, and the applied voltage. In most studies, the influence of the described factors on the LWC is not taken into account. At the same time, heat fluxes affecting all elements of the furnace structure, including the lining, depend on the shape of the arc. The aim of the work is to study this effect and find the parameters that provide optimization of the LWC. To achieve this goal, an algorithm for calculating the shape of arcs in an AC steelmaking furnace has been developed, which will be used to optimize the objective function.","PeriodicalId":338904,"journal":{"name":"Bulletin of the South Ural State University. Ser. Computer Technologies, Automatic Control & Radioelectronics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126990215","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}
G. Kulikov, V. Suvorova, M. Shilina, A. K. Khisametdinova
{"title":"A Systematic Approach to Information Modeling the Intellectual Management of Time Resources in the Subject Oriented Field (for Example, Control of the Timetable of the University)","authors":"G. Kulikov, V. Suvorova, M. Shilina, A. K. Khisametdinova","doi":"10.14529/ctcr200317","DOIUrl":"https://doi.org/10.14529/ctcr200317","url":null,"abstract":"","PeriodicalId":338904,"journal":{"name":"Bulletin of the South Ural State University. Ser. Computer Technologies, Automatic Control & Radioelectronics","volume":"40 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120858614","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":"Dynamic Model of Development and Implementation of the Project under the Influence of External Factors","authors":"S. Barkalov, A. Glushkov, S. Moiseev","doi":"10.14529/ctcr200208","DOIUrl":"https://doi.org/10.14529/ctcr200208","url":null,"abstract":"","PeriodicalId":338904,"journal":{"name":"Bulletin of the South Ural State University. Ser. Computer Technologies, Automatic Control & Radioelectronics","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123802552","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}
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