Pub Date : 2023-10-01DOI: 10.17586/2226-1494-2023-23-5-878-885
E.E. Kalugin, V.E. Strigalev, A.B. Mukhtubaev, I.K. Meshkovskii
One of the applications of polarization maintaining (PM) fibers is the creation of various sensors including level and hydrostatic pressure sensors. An external mechanical stress on a PM fiber causes cross-polarization coupling. In micro- and macro-bend pressure sensors, the attenuation of the optical signal increases with increasing external pressure. Combination of two physical principles in one sensor allows to create fiber-optic sensors of high sensitivity for operation at pressure more than 18 kPa. At the same time, the registration scheme is significantly simplified. An optical fiber with an elliptical ESC-4 stress cladding was used as a prototype. A superluminiscent diode ThorLabs S5FC1005SXL with a center wavelength of 1560 nm and a spectrum half-width of 45 nm was used in the study. In this work, the effect of induced periodic mechanical stress on cross-polarization coupling magnitude in a PM fiber with an elliptical stress cladding was considered. The induced periodic stress was generated by a proposed and specially fabricated periodic structure of optical fiber sections bonded to a glass substrate. The pressure on the fiber prototype was changed by weights of known mass as well as by rotating the fiber around its axis with a step of 5°. Hydrostatic pressure was created by means of a water tank placed in the barocamera. The cross-polarization coupled power was recorded with two photodetectors using a polarization beam splitter. It is shown that the largest value of the relative coupled power is achieved at the period of mechanical stress equal to the beat length of PM fiber. The dependence of the relative coupled power on the hydrostatic pressure is obtained for the prototype sensor. It is shown that the highest value of the relative coupled power is achieved at a pressure of 80 kPa. The threshold sensitivity amounted to 20 kPa. The decrease in coupled power at pressures greater than 80 kPa is attributed to induced optical losses. At pressure less than 20 kPa, a hysteresis of indicators up to 0.006 relative units is noticeable. A sample sensor for measuring hydrostatic pressure up to 80 kPa with the standard deviation of measurement results up to 7 % was obtained. The threshold sensitivity is limited to 20 kPa. The performed research can be applied in the development of fiber-optic pressure sensors.
{"title":"Cross-polarization coupling in polarization maintaining fiber induced by periodic mechanical stress","authors":"E.E. Kalugin, V.E. Strigalev, A.B. Mukhtubaev, I.K. Meshkovskii","doi":"10.17586/2226-1494-2023-23-5-878-885","DOIUrl":"https://doi.org/10.17586/2226-1494-2023-23-5-878-885","url":null,"abstract":"One of the applications of polarization maintaining (PM) fibers is the creation of various sensors including level and hydrostatic pressure sensors. An external mechanical stress on a PM fiber causes cross-polarization coupling. In micro- and macro-bend pressure sensors, the attenuation of the optical signal increases with increasing external pressure. Combination of two physical principles in one sensor allows to create fiber-optic sensors of high sensitivity for operation at pressure more than 18 kPa. At the same time, the registration scheme is significantly simplified. An optical fiber with an elliptical ESC-4 stress cladding was used as a prototype. A superluminiscent diode ThorLabs S5FC1005SXL with a center wavelength of 1560 nm and a spectrum half-width of 45 nm was used in the study. In this work, the effect of induced periodic mechanical stress on cross-polarization coupling magnitude in a PM fiber with an elliptical stress cladding was considered. The induced periodic stress was generated by a proposed and specially fabricated periodic structure of optical fiber sections bonded to a glass substrate. The pressure on the fiber prototype was changed by weights of known mass as well as by rotating the fiber around its axis with a step of 5°. Hydrostatic pressure was created by means of a water tank placed in the barocamera. The cross-polarization coupled power was recorded with two photodetectors using a polarization beam splitter. It is shown that the largest value of the relative coupled power is achieved at the period of mechanical stress equal to the beat length of PM fiber. The dependence of the relative coupled power on the hydrostatic pressure is obtained for the prototype sensor. It is shown that the highest value of the relative coupled power is achieved at a pressure of 80 kPa. The threshold sensitivity amounted to 20 kPa. The decrease in coupled power at pressures greater than 80 kPa is attributed to induced optical losses. At pressure less than 20 kPa, a hysteresis of indicators up to 0.006 relative units is noticeable. A sample sensor for measuring hydrostatic pressure up to 80 kPa with the standard deviation of measurement results up to 7 % was obtained. The threshold sensitivity is limited to 20 kPa. The performed research can be applied in the development of fiber-optic pressure sensors.","PeriodicalId":21700,"journal":{"name":"Scientific and Technical Journal of Information Technologies, Mechanics and Optics","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136247544","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}
Pub Date : 2023-10-01DOI: 10.17586/2226-1494-2023-23-5-955-966
S.A. Shaker, A.S. Arif, Y. Fazea
Motion estimation plays a crucial role in video coding; the Adaptive Rood Pattern Search (ARPS) algorithm is a well known fast motion estimation algorithm. However, ARPS has certain limitations, such as the lack of an accurate starting motion vector, a fixed Zero Motion Prejudgment (ZMP) threshold unsuitable for fast motion video sequences, and the repetitive use of a Unit Rood Pattern (URP) resulting in increased computational complexity. To address these issues, this paper proposes a novel algorithm called Efficient Adaptive Rood Pattern Search (EARPS). EARPS overcomes these limitations by employing the Full Search algorithm to obtain optimal motion vectors for the first column in each frame, adopting a dynamic ZMP threshold that adapts to varying motion speeds in video sequences and utilizing URP only once to reduce computational overhead. The performance of the new proposed EARPS algorithm is evaluated and compared with that of ARPS algorithm using various video sequences with different motion speeds. The number of searching points and Peak Signal-to-Noise Ratio (PSNR) are used to quantify computing complexity and accuracy. The experimental findings show that EARPS surpasses ARPS in terms of computing complexity while retaining a decent degree of PSNR accuracy. The proposed EARPS motion estimation algorithm main contribution is to achieve high speed with reasonable accuracy, regardless of the type of motion speed in the video frames. The EARPS algorithm offers a substantial advancement over ARPS, delivering a more efficient motion estimation method with broader applicability in video processing. It represents a significant contribution to the development of effective motion estimation algorithms.
{"title":"A new efficient adaptive rood pattern search motion estimation algorithm","authors":"S.A. Shaker, A.S. Arif, Y. Fazea","doi":"10.17586/2226-1494-2023-23-5-955-966","DOIUrl":"https://doi.org/10.17586/2226-1494-2023-23-5-955-966","url":null,"abstract":"Motion estimation plays a crucial role in video coding; the Adaptive Rood Pattern Search (ARPS) algorithm is a well known fast motion estimation algorithm. However, ARPS has certain limitations, such as the lack of an accurate starting motion vector, a fixed Zero Motion Prejudgment (ZMP) threshold unsuitable for fast motion video sequences, and the repetitive use of a Unit Rood Pattern (URP) resulting in increased computational complexity. To address these issues, this paper proposes a novel algorithm called Efficient Adaptive Rood Pattern Search (EARPS). EARPS overcomes these limitations by employing the Full Search algorithm to obtain optimal motion vectors for the first column in each frame, adopting a dynamic ZMP threshold that adapts to varying motion speeds in video sequences and utilizing URP only once to reduce computational overhead. The performance of the new proposed EARPS algorithm is evaluated and compared with that of ARPS algorithm using various video sequences with different motion speeds. The number of searching points and Peak Signal-to-Noise Ratio (PSNR) are used to quantify computing complexity and accuracy. The experimental findings show that EARPS surpasses ARPS in terms of computing complexity while retaining a decent degree of PSNR accuracy. The proposed EARPS motion estimation algorithm main contribution is to achieve high speed with reasonable accuracy, regardless of the type of motion speed in the video frames. The EARPS algorithm offers a substantial advancement over ARPS, delivering a more efficient motion estimation method with broader applicability in video processing. It represents a significant contribution to the development of effective motion estimation algorithms.","PeriodicalId":21700,"journal":{"name":"Scientific and Technical Journal of Information Technologies, Mechanics and Optics","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136247545","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}
Pub Date : 2023-10-01DOI: 10.17586/2226-1494-2023-23-5-1065-1072
V.E. Fomin, A.V. Novotelnova, G.A. Bolkunov, F.Yu. Bochkanov, D.Yu. Karpenkov
In the search for new magnetically ordered phases of materials, solid-state synthesis technologies in reaction crucibles are used. The final result of the synthesis process in reaction crucibles is conditioned, in particular, by technological factors, the mode of current flow and its density, the achieved temperature in the reaction zone, exposure time, geometrical parameters of the crucible and the reaction zone, etc. The paper presents the results of influence investigation of the reaction volume filling degree with tin melt on the processes of heat and mass transfer during its electrothermal treatment. A model describing diffusion processes in the reaction zone during the synthesis of iron and tin intermetallides under electrothermal treatment has been proposed. The diffusion process in the reaction crucibles of the iron-tin system was investigated by the finite element method in the Comsol Multiphysics software environment. It is shown that the decrease in the degree of filling of the reaction crucible with synthesis components leads to a change in the distribution of current density and a decrease in the temperature in the reaction zone, which affects the mass transfer processes. The results of the work can be used in the analysis of experimental data on the production of intermetallides by reaction synthesis and determination of the necessary technological parameters for the synthesis of new materials.
{"title":"Study of heat and mass transfer processes in the Fe-Sn reaction crucible in the presence of high-density electric current","authors":"V.E. Fomin, A.V. Novotelnova, G.A. Bolkunov, F.Yu. Bochkanov, D.Yu. Karpenkov","doi":"10.17586/2226-1494-2023-23-5-1065-1072","DOIUrl":"https://doi.org/10.17586/2226-1494-2023-23-5-1065-1072","url":null,"abstract":"In the search for new magnetically ordered phases of materials, solid-state synthesis technologies in reaction crucibles are used. The final result of the synthesis process in reaction crucibles is conditioned, in particular, by technological factors, the mode of current flow and its density, the achieved temperature in the reaction zone, exposure time, geometrical parameters of the crucible and the reaction zone, etc. The paper presents the results of influence investigation of the reaction volume filling degree with tin melt on the processes of heat and mass transfer during its electrothermal treatment. A model describing diffusion processes in the reaction zone during the synthesis of iron and tin intermetallides under electrothermal treatment has been proposed. The diffusion process in the reaction crucibles of the iron-tin system was investigated by the finite element method in the Comsol Multiphysics software environment. It is shown that the decrease in the degree of filling of the reaction crucible with synthesis components leads to a change in the distribution of current density and a decrease in the temperature in the reaction zone, which affects the mass transfer processes. The results of the work can be used in the analysis of experimental data on the production of intermetallides by reaction synthesis and determination of the necessary technological parameters for the synthesis of new materials.","PeriodicalId":21700,"journal":{"name":"Scientific and Technical Journal of Information Technologies, Mechanics and Optics","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136247733","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}
Pub Date : 2023-08-01DOI: 10.17586/2226-1494-2023-23-4-757-766
L. Tagirova, T. Zubkova
{"title":"Intelligent adaptive testing system","authors":"L. Tagirova, T. Zubkova","doi":"10.17586/2226-1494-2023-23-4-757-766","DOIUrl":"https://doi.org/10.17586/2226-1494-2023-23-4-757-766","url":null,"abstract":"","PeriodicalId":21700,"journal":{"name":"Scientific and Technical Journal of Information Technologies, Mechanics and Optics","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84448924","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}
Pub Date : 2023-08-01DOI: 10.17586/2226-1494-2023-23-4-776-785
A. Tiple, A. Kakade
{"title":"Brain tumour segmentation in MRI using fuzzy deformable fusion model with Dolphin-SCA","authors":"A. Tiple, A. Kakade","doi":"10.17586/2226-1494-2023-23-4-776-785","DOIUrl":"https://doi.org/10.17586/2226-1494-2023-23-4-776-785","url":null,"abstract":"","PeriodicalId":21700,"journal":{"name":"Scientific and Technical Journal of Information Technologies, Mechanics and Optics","volume":"77 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83667191","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}
Pub Date : 2023-08-01DOI: 10.17586/2226-1494-2023-23-4-676-684
K. Matveeva, A. Kundalevich, A. Kapitunova, A. Zozulya, S. Sukhikh, A. Tsibulnikova, A. Zyubin, I. Samusev
{"title":"Application of Raman spectroscopy to study the inactivation process of bacterial microorganisms","authors":"K. Matveeva, A. Kundalevich, A. Kapitunova, A. Zozulya, S. Sukhikh, A. Tsibulnikova, A. Zyubin, I. Samusev","doi":"10.17586/2226-1494-2023-23-4-676-684","DOIUrl":"https://doi.org/10.17586/2226-1494-2023-23-4-676-684","url":null,"abstract":"","PeriodicalId":21700,"journal":{"name":"Scientific and Technical Journal of Information Technologies, Mechanics and Optics","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75677017","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}
Pub Date : 2023-08-01DOI: 10.17586/2226-1494-2023-23-4-820-827
Динара Есентаевна Курманова, Нурболат Жумабекович Джайчибеков, Dinara E. Kurmanova, Nurbolat Zh, Jaichibekov, L. Gumilyov
Heating of oil and oil products is widely used to reduce energy losses during transportation. The flow in the annular space of the heat exchanger is complex and depends on many factors. The use of thin tubes in helicoid-type heat exchangers makes it necessary to take into account the transition of the flow regime from laminar to turbulent. The semi-empirical turbulence models traditionally used in numerical calculations do not take into account the laminar-turbulent transition.
{"title":"Modeling and simulation of heat exchanger with strong dependence of oil viscosity on temperature","authors":"Динара Есентаевна Курманова, Нурболат Жумабекович Джайчибеков, Dinara E. Kurmanova, Nurbolat Zh, Jaichibekov, L. Gumilyov","doi":"10.17586/2226-1494-2023-23-4-820-827","DOIUrl":"https://doi.org/10.17586/2226-1494-2023-23-4-820-827","url":null,"abstract":"Heating of oil and oil products is widely used to reduce energy losses during transportation. The flow in the annular space of the heat exchanger is complex and depends on many factors. The use of thin tubes in helicoid-type heat exchangers makes it necessary to take into account the transition of the flow regime from laminar to turbulent. The semi-empirical turbulence models traditionally used in numerical calculations do not take into account the laminar-turbulent transition.","PeriodicalId":21700,"journal":{"name":"Scientific and Technical Journal of Information Technologies, Mechanics and Optics","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85245249","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}
Pub Date : 2023-08-01DOI: 10.17586/2226-1494-2023-23-4-803-811
Маргарита Алексеевна Тит, Сергей Николаевич Беляев, Александр Григорьевич Щербак, Ольга Сергеевна Юльметова, M. A. Tit, Sergey N. Belyaev, Alexandr G. Shcherbak, O. Yulmetova
Improvement of the manufacturing technology for gyroscopic devices, which autonomously generate motion parameters of moving objects, has strategic importance and priority for various industries. The object of current research is a spherical rotor of an electrostatically suspended gyroscope which geometric parameters determine the accuracy characteristics of the device. The paper presents results of the process modeling of spherical form correction for rotors of electrostatically suspended gyroscopes at the stage of its manufacture during the coating deposition process. The proposed mathematical model of the deposition process is based on the placement of a movable screen with a hole between a rotor and a spray source. The axis of the hole lies on the dynamic axis of the rotor and it provides a formation of a spherical segment on the coating rotor surface. During deposition of an additional layer, the screen or rotor moves along the dynamic axis of the rotor changing the distance between the rotor and the screen, and there is additional rotation of the rotor around its dynamic axis. It allows adjusting the curvature of the formed coating on the rotor surface. An analytical model of the technological process for correcting the shape of spherical rotors of electrostatically suspended gyroscopes has been developed. A mathematical description, control factors and significant parameters of the process are given. The results of practical testing of the developed model are presented. The presented mathematical model makes it possible to correct the shape of the rotors during the deposition of a functional coating expanding the technological possibilities and increasing the accuracy of rotors.
{"title":"Modeling of the process of spherical form correction for rotors of electrostatically suspended gyros","authors":"Маргарита Алексеевна Тит, Сергей Николаевич Беляев, Александр Григорьевич Щербак, Ольга Сергеевна Юльметова, M. A. Tit, Sergey N. Belyaev, Alexandr G. Shcherbak, O. Yulmetova","doi":"10.17586/2226-1494-2023-23-4-803-811","DOIUrl":"https://doi.org/10.17586/2226-1494-2023-23-4-803-811","url":null,"abstract":"Improvement of the manufacturing technology for gyroscopic devices, which autonomously generate motion parameters of moving objects, has strategic importance and priority for various industries. The object of current research is a spherical rotor of an electrostatically suspended gyroscope which geometric parameters determine the accuracy characteristics of the device. The paper presents results of the process modeling of spherical form correction for rotors of electrostatically suspended gyroscopes at the stage of its manufacture during the coating deposition process. The proposed mathematical model of the deposition process is based on the placement of a movable screen with a hole between a rotor and a spray source. The axis of the hole lies on the dynamic axis of the rotor and it provides a formation of a spherical segment on the coating rotor surface. During deposition of an additional layer, the screen or rotor moves along the dynamic axis of the rotor changing the distance between the rotor and the screen, and there is additional rotation of the rotor around its dynamic axis. It allows adjusting the curvature of the formed coating on the rotor surface. An analytical model of the technological process for correcting the shape of spherical rotors of electrostatically suspended gyroscopes has been developed. A mathematical description, control factors and significant parameters of the process are given. The results of practical testing of the developed model are presented. The presented mathematical model makes it possible to correct the shape of the rotors during the deposition of a functional coating expanding the technological possibilities and increasing the accuracy of rotors.","PeriodicalId":21700,"journal":{"name":"Scientific and Technical Journal of Information Technologies, Mechanics and Optics","volume":"153 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85397782","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}
Pub Date : 2023-08-01DOI: 10.17586/2226-1494-2023-23-4-850-853
Алексей Алексеевич Бобцов, Николай Анатольевич, Николаев2, Ольга Андреевна Козачёк, Ольга Владимировна Оськина, A. Bobtsov, Nikolay A. Nikolaev, O. Kozachek, O. Oskina
Unknown constant parameters estimation problem for a nonlinear time-varying system with delayed measurements is considered. The objective of this work is to design an adaptive observer for a nonlinear time-varying system. The observer must provide asymptotic convergence of the unknown constant parameters estimates to their true values. The main idea behind the method is to perform the parametrization of initial dynamical system based on GPEBO (Generalized Parameter Estimation Based Observer) technology and to build a linear regression model. The identification of linear regression model unknown parameters is performed using least square method with forgetting factor. This work develops the previously published approach for the case of nonlinear time-varying systems with delayed measurements. New parameters estimation algorithm can be applied for technical tasks, such as technical condition control and automatic control systems design.
研究一类具有时滞测量的非线性时变系统的未知常参数估计问题。本文的目标是设计一个非线性时变系统的自适应观测器。观测器必须提供未知常数参数估计到其真值的渐近收敛性。该方法的主要思想是基于GPEBO (Generalized Parameter Estimation based Observer)技术对初始动力系统进行参数化，并建立线性回归模型。采用带遗忘因子的最小二乘法对线性回归模型的未知参数进行辨识。这项工作发展了以前发表的方法，用于具有延迟测量的非线性时变系统。新的参数估计算法可以应用于工艺条件控制和自动控制系统设计等技术任务。
{"title":"Adaptive observer for state variables of a time-varying nonlinear system with unknown constant parameters and delayed measurements","authors":"Алексей Алексеевич Бобцов, Николай Анатольевич, Николаев2, Ольга Андреевна Козачёк, Ольга Владимировна Оськина, A. Bobtsov, Nikolay A. Nikolaev, O. Kozachek, O. Oskina","doi":"10.17586/2226-1494-2023-23-4-850-853","DOIUrl":"https://doi.org/10.17586/2226-1494-2023-23-4-850-853","url":null,"abstract":"Unknown constant parameters estimation problem for a nonlinear time-varying system with delayed measurements is considered. The objective of this work is to design an adaptive observer for a nonlinear time-varying system. The observer must provide asymptotic convergence of the unknown constant parameters estimates to their true values. The main idea behind the method is to perform the parametrization of initial dynamical system based on GPEBO (Generalized Parameter Estimation Based Observer) technology and to build a linear regression model. The identification of linear regression model unknown parameters is performed using least square method with forgetting factor. This work develops the previously published approach for the case of nonlinear time-varying systems with delayed measurements. New parameters estimation algorithm can be applied for technical tasks, such as technical condition control and automatic control systems design.","PeriodicalId":21700,"journal":{"name":"Scientific and Technical Journal of Information Technologies, Mechanics and Optics","volume":"100 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79180278","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}
Pub Date : 2023-08-01DOI: 10.17586/2226-1494-2023-23-4-720-733
D.A. Esipov, A. Buchaev, A. Kerimbay, Y.V. Puzikova, S. Saidumarov, N.S. Sulimenko, I.Yu. Popov, N. Karmanovskiy
{"title":"Attacks based on malicious perturbations on image processing systems and defense methods against them","authors":"D.A. Esipov, A. Buchaev, A. Kerimbay, Y.V. Puzikova, S. Saidumarov, N.S. Sulimenko, I.Yu. Popov, N. Karmanovskiy","doi":"10.17586/2226-1494-2023-23-4-720-733","DOIUrl":"https://doi.org/10.17586/2226-1494-2023-23-4-720-733","url":null,"abstract":"","PeriodicalId":21700,"journal":{"name":"Scientific and Technical Journal of Information Technologies, Mechanics and Optics","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73764420","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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