Mathematical Modeling and Inverse Problem Approaches for Functional Clothing Design Based on Thermal Mechanism

Author(s):  
Dinghua Xu ◽  
Tingyue Li
Author(s):  
Driss Ait Omar ◽  
Mohamed El Amrani ◽  
Hamid Garmani ◽  
Mohamed Baslam ◽  
Mohamed Fakir

Optimization is an essential tool in the field of decision support. In this chapter, the authors study an inverse problem applied in the telecommunication networks. Indeed, in the telecommunication networks, service providers have subscription offers to customers. Since competition is strong in this sector, most of these advertising offerings, totally or partially ambiguous, are prepared to attract the attention of consumers. For this reason, customers face problems in making decisions about the choice of the operators that gives them a better report price/QoS. Mathematical modeling of this decision support problem led to the resolution of an inverse problem. More precisely, the inverse problem is to find the function of the QoS real knowing the QoS theoretical or advertising. This model will help customers who seek to know the degree of sincerity of their operators, and it is an opportunity for operators who want to maintain their resources so that they gain the trust of customers.


Author(s):  
Driss Ait Omar ◽  
Mohamed Baslam ◽  
Mourad Nachaoui ◽  
And Mohamed Fakir

<p>Currently the operators in the telecommunications market present offers of subscription to the consumers,and given that competition is strong in this area, most of these advertising offers are prepared to attract and / or keep customers.</p><p>For this reason, customers face problems in choosing operators that meet their needs in terms of price, quality of service (QoS), etc..., while taking into account the margin between what is advertising and what is real. Therefore, we are led to solve a problem of decision support. Mathematical modeling of this problem led to the solution of an inverse problem. Specifi-cally, the inverse problem is to find the real Quality of Service (QoS) function knowing the theoretical QoS. To solve this problem we have reformulated in an optimization problem of minimizing the difference between the real quality of service (QoS) and theoretical (QoS). This model will help customers who seek to know the degree of sincerity of Their operators, as well as it is an opportunity for operators who want to maintain their resources so that they gain the trust of customers. The resulting optimization problem is solved using evolutionary algorithms. The numerical results showed the reliability and credibility of our inverse model and the performance and effectiveness of our approach.</p>


2021 ◽  
Author(s):  
R.V. Polyakova ◽  
E.E. Perepyolkin ◽  
A.D. Kovalenko ◽  
A.A. Tarelkin

Design, construction and operation of the magnetic systems of some electrophysical setups require a preliminary mathematical modeling as well as a constant maintenance of mathematical modeling when debugging and operating the setups. While calculating the fields of the mentioned magnetic systems (on the base of solving a number of the direct problems of magnetostatics), we are concerned with the inverse problem of magnetostatics, namely, an optimal construction of the current elements and ferromagnetic yoke was found resulting in the expected distribution of the magnetic field. This work discusses the results on the numerical modeling of the distributing magnetic field for some modifications of the spectrometric magnet SP-94, SP-40 and the magnet of solenoid type, weach used in some experimental setups.


2016 ◽  
Vol 56 (5) ◽  
pp. 803-811 ◽  
Author(s):  
Xudong Wang ◽  
Lingwei Kong ◽  
Fengming Du ◽  
Man Yao ◽  
Xiaobing Zhang ◽  
...  

2020 ◽  
Vol 28 (2) ◽  
pp. 287-297 ◽  
Author(s):  
Sergey I. Kabanikhin ◽  
Dmitriy V. Klyuchinskiy ◽  
Nikita S. Novikov ◽  
Maxim A. Shishlenin

AbstractWe investigate the mathematical modeling of the 2D acoustic waves propagation, based on the conservation laws. The hyperbolic first-order system of partial differential equations is considered and solved by the method of S. K. Godunov. The inverse problem of reconstructing the density and the speed of sound of the medium is considered. We apply the gradient method to reconstruct the parameters of the medium. The gradient of the functional is obtained. Numerical results are presented.


Author(s):  
Driss Ait Omar ◽  
Mohamed El Amrani ◽  
Hamid Garmani ◽  
Mohamed Baslam ◽  
Mohamed Fakir

Optimization is an essential tool in the field of decision support. In this chapter, the authors study an inverse problem applied in the telecommunication networks. Indeed, in the telecommunication networks, service providers have subscription offers to customers. Since competition is strong in this sector, most of these advertising offerings, totally or partially ambiguous, are prepared to attract the attention of consumers. For this reason, customers face problems in making decisions about the choice of the operators that gives them a better report price/QoS. Mathematical modeling of this decision support problem led to the resolution of an inverse problem. More precisely, the inverse problem is to find the function of the QoS real knowing the QoS theoretical or advertising. This model will help customers who seek to know the degree of sincerity of their operators, and it is an opportunity for operators who want to maintain their resources so that they gain the trust of customers.


Author(s):  
В.Б. Свалова

Проблема формирования и эволюции геологических структур является одной из важнейших в тектонике и геодинамике. Связь поверхностных структур с глубинными движениями в литосфере и астеносфере всегда остается в центре исследований геологов и геофизиков. Кавказский регион является сложной высоконапряженной геодинамической структурой, характеризующейся повышенным тепловым потоком, высокой сейсмичностью, магматизмом и вулканизмом. Геодинамика Кавказского региона определяется коллизией Евразийской и Аравийской литосферных плит, а также сложной историей развития АльпийскоГималайского пояса. С точки зрения глубинной геодинамики Кавказ входит в одну из наиболее активных зон коллизии литосферных плит, характеризующихся значительными скоростями горизонтальных и вертикальных движений. Решение задачи формирования и эволюции геологических структур в различных сложных геодинамических обстановках требует анализа всех имеющихся геологогеофизических данных, а также постановки и решения задач механикоматематического моделирования. Разработано решение обратной задачи геодинамики прямым методом. Решена первая обратная задача геодинамики восстановление полей скоростей, давлений и напряжений на глубине литосферы по имеющимся данным о скоростях на дневной поверхности. Поставлена и решена вторая обратная задача геодинамики определение движения границ на глубине литосферы по заданным движениям дневной поверхности. Полученные решения могут использоваться для анализа глубинных геодинамических проблем, а совместно с геотермическим моделированием, геологогеофизическими методами и сейсмотомографией могут служить надежным аппаратом изучения глубинной геодинамики в связи с формированием и эволюцией геологических структур. Решение задачи анализируется на примере геодинамики Кавказского региона. Результаты механикоматематического моделирования хорошо подтверждаются данными геологогеодинамической реконструкции и сейсмотомографии. Механикоматематическое моделирование дает возможность изучать эволюцию геологической структуры в динамике, в то время как геофизика и сейсмотомография дают глубинный разрез слоев в настоящий момент времени. Сравнительный анализ различных подходов и решений дает возможность с большей надежностью делать выводы о глубинных механизмах движений и их проявлении на поверхности Земли и обосновать наиболее вероятные причины формирования и эволюции различных геологических структур и процессов. The problem of the formation and evolution of geological structures is one of the most important in tectonics and geodynamics. The connection of surface structures with deep movements in the lithosphere and asthenosphere always remains at the center of research by geologists and geophysicists. The Caucasus region is a complex highlystressed geodynamic structure, characterized by increased heat flow, high seismicity, magmatism and volcanism. The geodynamics of the Caucasus region is determined by the collision of the Eurasian and Arabian lithospheric plates, as well as the complex history of the development of the AlpineHimalayan belt. From the point of view of deep geodynamics, the Caucasus is one of the most active zones of collision of lithospheric plates, characterized by significant speeds of horizontal and vertical movements. The solution of the problem of the formation and evolution of geological structures in various complex geodynamic settings requires an analysis of all the available geological and geophysical data, as well as the formulation and solution of problems of mechanical and mathematical modeling. The solution of the inverse problem of geodynamics by the direct method is developed. The first inverse problem of geodynamics was solved the restoration of the velocity fields, pressures and stresses at the depth of the lithosphere according to the available data on the velocities on the surface. The second inverse problem of geodynamics has been posed and solved the determination of the movement of boundaries at the depth of the lithosphere based on the given movements of the surface The solutions obtained can be used to analyze deep geodynamic problems, and together with geothermal modeling, geological and geophysical methods and seismic tomography can serve as a reliable apparatus for studying deep geodynamics due to the formation and evolution of geological structures. The solution of the problem is analyzed on the example of the geodynamics of the Caucasus region. The results of mechanical and mathematical modeling are well confirmed by the data of geological and geodynamic reconstruction and seismotomography. Mechanomathematical modeling makes it possible to study the evolution of the geological structure in dynamics, while geophysics and seismotomography give a deep section of the layers at the moment. A comparative analysis of various approaches and solutions makes it possible to more reliably draw conclusions about the underlying mechanisms of movements and their manifestation on the Earths surface and substantiate the most probable reasons for the formation and evolution of various geological structures and processes.


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