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检索条件"任意字段=2nd International Conference on Thermal Process Modelling and Computer Simulation"

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Rolling process analysis of working rollers of cold rolling mill based on ANSYS 2

Rolling process analysis of working rollers of cold rolling ...

引用

2020 2nd international conference on computer Modeling, simulation and Algorithm, CMSA 2020

作者： Shi, Kun Zheng, Gang Hang, Jianhua Xi’an University of Technology Xi'anShaanxi China

Aiming at the complex changes of the working rollers and rolled pieces in the rolling process of a cold rolling mill, this paper built a finite element model of the working rollers and rolled pieces based on ANSYS, and analyzed the rolling process of working rollers by using the transient algorithm of structural dynamic equation. The stress-strain situation and rolling force curve of working rollers and rolling pieces were obtained, The results revealed the characteristic change process of working rollers and rolled pieces in the rolling process, which layed the foundation for further realizing the precise control of the rolling process of cold rolling mill. © 2020 Institute of Physics Publishing. All rights reserved.

关键词： Cold rolling

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Design of a CMOS Two-stage Fully Differential Operation Amplifier 2

Design of a CMOS Two-stage Fully Differential Operation Ampl...

引用

2019 2nd international Symposium on Power Electronics and Control Engineering, ISPECE 2019

作者： Qiao, Haotian Electrical Engineering Shandong University Jinan Shandong250002 China

Based on SMIC 0.18um CMOS process model, the operation amplifier designed in the thesis is simulated in the simulation software Cadence. In the regular environment, it has DC gain of 107dB, unity gain bandwidth of 57.48MHz, phase margin of 64.83° and output amplitude more than 3 V. © Published under licence by IOP Publishing Ltd.

关键词： computer software

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Parameters Optimization in Threshing and Redrying process Based on Random Forest and Orthogonal Experiment Design 2

Parameters Optimization in Threshing and Redrying Process Ba...

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2020 2nd international conference on computer Modeling, simulation and Algorithm, CMSA 2020

作者： Huang, Xiaoyan Zhao, Guangren Zheng, Yurui Huang, Jing Xie, Junli Jia, Zhiwei Chenzhou Redrying Factory Hunan Tobacco Redrying Co. Ltd Zhenzhou China College of Electrical and Information Engineering Changsha University of Science and Technology Changsha China

To improve the quality of threshing and re-drying production, a method fused by random forest and orthogonal experiment scheme are presented to optimal the process parameters. Random forest performed regression modelling on the historical data of process parameters and moisture value, and ranked the process parameters. The model is verified by field test and the gap between the predict results and reality is less than 5%, which satisfied the on-site demands. To achieve optimal parameter combination with limited numbers of time of experiments, orthogonal experiment scheme according to the order of importance is designed. The optimal parameter combination was calculated according to the results and verified by the random forest model and field test. Results of our optimal combination in filed test showed it was better than the historical ones. This fusion method illustrates its potentials to promote the decision of process of threshing and re-drying. © Published under licence by IOP Publishing Ltd.

关键词： Decision trees

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Mitigation of attack patterns based on routing reliance approach in MANETs 2

Mitigation of attack patterns based on routing reliance appr...

引用

2nd IEEE international conference on Advances in Computing, Communication Control and Networking, ICACCCN 2020

作者： Saravanan, T. Nithya, N.S. Anna University Information Communication Engineering Chennai India KSR College of Engineering Department of Computer Science and Engineering Namakkal India

ISBN: (纸本)9781728183374

The process of achieving appropriate routing is a major crisis in network modeling where Mobile ad-hoc Networks (MANETs) possess an adversarial network because of the lack in appropriate infrastructure, transmission nature, and dynamical topology. These features trends to make effectual modeling of routing to be more challenging. This work proposes Patterns for Routing Reliance (PRR) approach by adopting Support Vector Machine (SVM) that replicates cognitive process and relies over the measurement of trust-level of data to avoid diverse routing disruption attacks. Here, mobile nodes pretends to share the reliable information and examines the trustful information based on its cognitive manner. However, the nodes are dynamically evolves with the elimination of malicious factors. The most effectual characteristics of PRR are that they may not compromise with the internal attackers even though it is aware of security mechanisms. This work evaluates the performance of PRR under diverse routing based attack disruption scenario. The simulation is done with MATLAB environment and the PRR approach pretends to improve the scalability and fulfills the effectual routing mechanism during occurrence of attacks over MANET. © 2020 IEEE.

关键词： Mobile ad hoc networks

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20V HV Energy Harvesting Circuit with ACC/CV Mode and MPPT Control for a 5 W Solar Panel 2

20V HV Energy Harvesting Circuit with ACC/CV Mode and MPPT C...

引用

2nd international conference on Smart Power and Internet Energy Systems, SPIES 2020

作者： Lee, Tzung-Je Su, Po-Kai Wang, Chua-Chin Cheng Shiu University Department of Computer Science and Information Engineering Kaohsiung83347 Taiwan

ISBN: (纸本)9781728166117

A HV energy harvesting circuit with ACC/CV mode and MPPT control is proposed for a 20 V/5 W solar panel. By considering the CC/CV charging process of the Liion battery and the changing maximum power point of the solar panel, the adaptive constant current (ACC) mode with PWM and MPPT control is utilized to improving the efficiency when the light source is not strong and the battery is not full. While the battery reaches full-charged, the constant voltage (CV) mode is used to prevent the damage to the Li-ion battery. The proposed design is implemented using TSMC 0.5 um UHV process. Based on the simulation results, the circuit achieves the tracking efficiency of 98% for the photocurrent from 0.1 A to 0.3 A. © 2020 IEEE.

关键词： Timing circuits

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Research on the Application of Mathematical Methods in Image Denoising Technology

Research on the Application of Mathematical Methods in Image...

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Intelligent Computing and Human-computer Interaction (ICHCI), international conference on

作者： Wenbo Song Canada British Columbia International Schools – Chengdu Chengdu China

ISBN: (纸本)9781665407656

In the process of acquisition, compression, transmission and storage, digital images are often interfered by imaging equipment and the external environment, resulting in image distortion. Image denoising aims to truly reconstruct the image from the observation data contaminated by noise to provide more accurate and reliable information for the subsequent processing of the image. Therefore, image noise reduction is the most basic and most important link in the field of image processing research. In the past decade or so, the application of theories and methods of partial differential equations (PDEs) in various fields of image processing has attracted more and more attention. This article researches and analyzes the image processing methods based on partial differential equations. First, it introduces the research background of this article, the development history, principles of partial differential equations and the status quo of image processing; then, it summarizes and analyzes the application of partial differential equations to images Classical model of denoising. Through the analysis of the classic model, it can be known that the image noise reduction algorithm based on partial differential equations can be based on the structural characteristics of the image. This method adopts a corresponding smoothing strategy, and it can achieve satisfactory image denoising effects.

关键词： Analytical models Image coding TV Smoothing methods Partial differential equations Digital images simulation

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Research of virtual reality technology in home design 2

Research of virtual reality technology in home design

引用

2020 2nd international conference on computer Modeling, simulation and Algorithm, CMSA 2020

作者： Phommaly, Khamla Yu, Lasheng School of Computer Science and Technology Central South University Changsha China

This paper mainly discusses the application of virtual reality technology in home design. Through virtual reality technology, we can have more realistic experience and switch freely in each space, so that customers can feel the future home personally. Built by importing household design, real 3D model, combined with the virtual reality modelling language (VRML) generated with interactive link the prototype of the object, to quickly build furniture design based on the technology of web 3D virtual reality display system. System combined with rich interactive methods, adjust and contrast design, advance awareness the real effect of household is decorated, improve customer satisfaction;Combination scheme design, the system can also be used for virtual simulation practice. Engineering practice proved that the system development is simple, high efficiency and can greatly accelerate the household decoration engineering design schedule and save time cost, and has high value in engineering practice. This article provides a new Angle of view to parse the virtual reality technology in the application of home design © Published under licence by IOP Publishing Ltd.

关键词： Customer satisfaction

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Arabic handwritten recognition based on deep convolutional neural network

Arabic handwritten recognition based on deep convolutional n...

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The 2nd international conference on Distributed Sensing and Intelligent Systems (ICDSIS 2021)

作者： A. Alzebdeh M. Moneb Khaled M. Lataifeh A. Elnagar Department of Computer Science University of Sharjah UAE

Automatic handwritten recognition is a simulation of the human reading process by converting a handwritten input to an editable typed form. A successful deployment of such a system requires a robust character handwritten recognition module. Research papers conducted on the Arabic language are scarce compared to other languages due to the complexity and cursive nature of the Arabic language where characters are written in a conjoined and owing manner. We propose two deep learning models based on a Convolutional Neural Network (CNN) to classify Arabic handwritten characters using two publicly available datasets AIA9K and AHCD. Pre-processing and data augmentation have been successfully utilized to improve performance. We employed an Arabic word segmentation algorithm to disassemble a word into its letters, which makes the input to the classification system. The experimental results demonstrate solid performance with an average accuracy of 96.72% and 98.21% on AIA9k and AHCD datasets, respectively. The performance is boosted to 97.54% and 98.82%, with data augmentation on the respective datasets. Furthermore, the two augmented datasets were merged to build a generalized model that achieved outstanding accuracy of 98.27% using a modified approach of LeNet-5.

关键词： feature extraction handwriting recognition handwritten character recognition image classification image segmentation learning (artificial intelligence) natural language processing neural nets pattern classification

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Finite element-based lifetime modelling of SAC solder joints in LED applications

Finite element-based lifetime modelling of SAC solder joints...

引用

thermal, Mechanical and Multiphysics simulation and Experiments in Micro-Electronics and Micro-Systems EuroSimE

作者： M. Shaygi M. Li K.J. Lang H. Laux B. Wunderle OSRAM Opto Semiconductors Regensburg Germany Technische Universität Chemnitz Germany Fraunhofer ENAS Chemnitz Germany

ISBN: (纸本)9781665413732;9781665413749

The integrity of the solder joint is critical to ensure long-term reliability of power-LEDs under harsh environmental conditions. Many studies have focused on prediction of the lifetime for different lead-free solder joints in temperature cycling tests especially Ball Grid Arrays (BGA), flip chip, SMD, etc [1]. However, physics-of-failure (PoF) based solder fatigue modelling is an on-going struggle for microelectronics and microsystems industry since it heavily depends on the geometry of the solder solder (i.e. package type and therefore, correct implementation of the thermo-mechanical response) and, precise knowledge of valid process dependent material properties, above all for the solder material. Further, a comparison of lifetime data between different package types depends on a stringent definition of a suitable failure criterion and evaluation of the local failure parameter. This makes it challenging to establish a reliable and universal lifetime model for a specific solder material across package types. In LEDs L2 bonding by solder attach, due to thermal management requirements the use of Insulated Material Substrates (IMS) is compulsory. The combination of Metal-Core-PCB boards and the ceramic substrate in LEDs introduces a complexity factor caused by the large E-modulus and CTE mismatch which must be *** this paper, a model is developed to predict the lifetime of SAC305 solder joint in a LED on board setup using accelerated tests and finite element modelling where crack length is the failure criterion and the accumulated creep strain is the computational failure parameter to quantify damage. Moreover, influence of geometrical factors on reliability of LED is investigated. Moreover, it was observed that process uncertainties such as void could largely impact the lifetime which leads us to dive further in robustness evaluation within a physics of failure reliability paradigm.

关键词： Micromechanical devices Uncertainty Thermomechanical processes Light emitting diodes thermal management Microelectronics Finite element analysis

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Estimation of gas exchange parameters in the engine by numerical simulation 2

Estimation of gas exchange parameters in the engine by numer...

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2nd international Scientific conference on Applied Physics, Information Technologies and Engineering (APITECH)

作者： Zholobov, L. A. Medvedev, A., V Pasin, A., V Novozhilov, A., I Nizhny Novgorod State Agr Acad Dept Exploitat Mobile Power Vehicles & Agr Machin Gagarin Prospect 97 Nizhnii Novgorod 603107 Russia

The article is devoted to mathematical modeling of gas exchange processes. The features of modeling gas exchange processes based on gas dynamics equations are shown. The parameters of the gas flow are calculated by three conservation laws obtained by applying the general laws of physics to the elementary mass released in the flow, followed by a transition to the limit when the volume occupied by this mass tends to zero: momentum, mass, and energy. A mathematical model of the working process in the engine cylinder is created by the necessary conditions for calculating the entire gas exchange. Using a computer allows for a more accurate and complete description of all the main features. In the foreground is not the complexity and volume of calculations, but the accuracy of approximating the processes of fresh charge entering the engine cylinders, the air flow in the intake tract, the possibility of a comprehensive study of the effect on the filling process of each of the parameters of the intake tract design and gas distribution, and the features of the engine operation mode under study. Filling dynamic phenomena in the intake system has the main goal of optimizing engine design parameters.

关键词： Flow of gases

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