检索结果-南通市图书馆

Detecting Driver Distraction Using Deep-Learning Approach

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2021年第7期68卷 689-704页

作者： khalid A.AlShalfan Mohammed Zakariah College of Computer and Information Sciences Al-Imam Muhammad Ibn Saud Islamic UniversityRiyadh11564Saudi Arabia College of Computer and Information Science King Saud UniversityRiyadh11442Saudi Arabia

Currently,distracted driving is among the most important causes of traffic ***,intelligent vehicle driving systems have become increasingly ***,interest in driver-assistance systems that detect driver actions and help them drive safely has *** these studies,although some distinct data types,such as the physical conditions of the driver,audio and visual features,and vehicle information,are used,the primary data source is images of the driver that include the face,arms,and hands taken with a camera inside the *** this study,an architecture based on a convolution neural network(CNN)is proposed to classify and detect driver *** efficient CNN with high accuracy is implemented,and to implement intense convolutional networks for large-scale image recognition,a new architecture was proposed based on the available Visual Geometry Group(VGG-16)*** proposed architecture was evaluated using the StateFarm dataset for driver-distraction *** dataset is publicly available on Kaggle and is frequently used for this type of *** proposed architecture achieved 96.95%accuracy.

关键词： Deep learning driver-distraction detection convolution neural networks VGG-16

Exchange Coupling and Magnetic Behavior of SmCo_(5-x)Sn_x Alloys

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2011年第3期27卷 218-222页

作者： Hamid Zaigham F.Ahmad khalid Faculty of Materials Science and Engineering GIK Institute of Engineering Sciences and Technology

Exchange coupling and magnetic properties of SmCo5 alloys containing different amounts of Sn were investigated in sintered magnets. X-ray diffraction analysis revealed the formation of Sm2Co17 and Sm2Co7 phases in SmCo5 matrix. Exchange coupling mechanism was evaluated by switching field distribution, dcdemagnetization and magnetization curves as function of reverse applied field. Energy product of 59.2 kJ/m3 （7.4 MGOe）, remanent magnetization to maximum magnetization ratio of 0.97 and remanence coercivity to intrinsic coercivity ratio of 1.75 were achieved for 0.2 at.% Sn.

关键词： Nanocomposite magnet Nanocrystalline phases Sintering Exchange interactions

Quantum Stackelberg Duopoly in a Noninertial Frame

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2011年第7期28卷 5-8页

作者： Salman Khan M.khalid Khan Department of Physics Quaid-i-Azam UniversityIslamabad 45320Pakistan

We study the influence of the Unruh effect on quantum Stackelberg *** is shown that the acceleration of a noninertial frame strongly affects the payoffs of the *** validation of the subgame perfect Nash equilibrium is limited to a particular range of acceleration of the noninertial *** benefit of the initial state entanglement in the quantum form of the duopoly in the inertial frame is adversely affected by the *** duopoly can become a follower advantage only in a small region of the acceleration.

关键词： acceleration Stackelberg Quantum

Effect of Filler Composition on the Brazing of Alumina to Copper Using Ultrasonic Wave

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2003年第z1期19卷 176-178页

作者： khalid M. HAFEZ Masaaki NAKA Joining & Welding Research Institute Osaka University Ibaraki Osaka 567-0047 Japan Joining & Welding Research Institute Osaka University Ibaraki Osaka 567-0047 Japan

An ultrasonic wave was applied during brazing of alumina to Cu. First alumina was metallized by applying ultrasonicwave in braze bath. Then the metallized alumina was brazed with Cu using the same filler alloy. The filler used wereZn-Al alloys and Zn-Sn Alloys. The weight percent of Al in filler was ranging between 0, 5%, 10%, *** weight percent of tin in filler was ranging between 0, 30%, 60% and 91%, respectively. The joining mechanismwas investigated by measuring the joining strength, hardness and analyzing the microstructure at interface of thejoint. The shear strength and microstructure of the joint strongly depend on the filler composition. The effect ofultrasound was derived primarily from acoustic cavitations, impact and friction of the filler against alumina *** improved the wetting between alumina and the filler, and reflected to improve the joint strength. Anotherultrasonic advantage as to reduce of the joining temperature, that reduced the thermal stress in the braze joint.

关键词： Alumina, Copper, Ultrasonic waves, Fracture stress, Microstructure, Brazing

ON THE ASYMPTOTIC SPECTRUM OF A TRANSPORT OPERATOR WITH ELASTIC AND INELASTIC COLLISION OPERATORS

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2020年第3期40卷 805-823页

作者： Abdul-Majeed AL-IZERI khalid LATRACH UniversitéClermont Auvergne CNRSLMBPF-63000 Clermont-FerrandFrance

In this article,we investigate the spectral properties of a class of neutron transport operators involving elastic and inelastic collision operators introduced by Larsen and Zweifel[1].Our analysis is manly focused on the description of the asymptotic spectrum which is very useful in the study of the properties of the solution to Cauchy problem governed by such operators(when it exists).The last section of this work is devoted to the properties of the leading eigenvalue(when it exists).So,we discuss the irreducibility of the semigroups generated by these *** close this section by discussing the strict monotonicity of the leading eigenvalue with respect to the parameters of the operator.

关键词： Compactness properties transport operator abstract boundary conditions asymptotic spectrum irreducibility leading eigenvalue

Global dynamics of an age-structured viral infection model with general incidence function and absorption

在线全文

学校读者我要写书评

暂无评论

International Journal of Biomathematics 2018年第5期11卷 93-110页

作者： khalid Hattaf Yu Yang Centre Regional des Mdtiers de l'Education et de la Formation (CRMEF) 20340 Derb Ghalef Casablanca Morocco School of Science and Technology Zhejiang International Studies University Hangzhou 310023 P. R. China

In this paper, we propose an age-structured viral infection model with general incidence function that takes account of the loss of viral particles due to their absorption into susceptible cells. The proposed model is described by partial differential and ordinary differential equations. We first show that the model is mathematically and biologically well-posed. Furthermore, the uniform persistence and the global behavior of the model are investigated. Moreover, the age-structured models and results presented in many previous studies are improved and generalized.

关键词： Age of infection general incidence function global stability

Adaptive Backstepping Control Design for Semi-Active Suspension of Half-Vehicle With Magnetorheological Damper

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2021年第3期8卷 582-596页

作者： khalid El Majdoub Fouad Giri Fatima-Zahra Chaoui Department of Electrical Engineering University Hassan IIFaculty of Science and TechnologyMohammedia 20030Morocco Department of Electrical Engineering University de Caen NormandieCaen 14032France Department of Electrical Engineering University Mohamed VRabat 10000Morocco

This paper investigates the problem of controlling half-vehicle semi-active suspension system involving a magnetorheological(MR)*** features a hysteretic behavior that is presently captured through the nonlinear Bouc-Wen *** control objective is to regulate well the heave and the pitch motions of the chassis despite the road *** difficulty of the control problem lies in the nonlinearity of the system model,the uncertainty of some of its parameters,and the inaccessibility to measurements of the hysteresis internal state *** Lyapunov control design tools,we design two observers to get online estimates of the hysteresis internal states and a stabilizing adaptive state-feedback *** whole adaptive controller is formally shown to meet the desired control *** theoretical result is confirmed by several simulations demonstrating the supremacy of the latter compared to the skyhook control and passive suspension.

关键词： Adaptive control backstepping control Bouc-Wen model half vehicle model magnetorheological(MR)damper semiactive suspension skyhook control state observation

Migration of existing software systems to mobile computing platforms:a systematic mapping study

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2021年第2期15卷 13-37页

作者： Ibrahim ALSEADOON Aakash AHMAD Adel ALKHALIL khalid SULTAN College of Computer Science and Engineering University of Ha’ilHa’il2440Saudi Arabia College of Engineering and Applied Sciences American University of KuwaitSalmiya13034Kuwait

Mobile computing has fast emerged as a pervasive technology to replace the old computing paradigms with portable computation and context-aware *** software systems can be migrated(while preserving their data and logic)to mobile computing platforms that support portability,context-sensitivity,and enhanced *** recent years,some research and development efforts have focused on a systematic migration of existing software systems to mobile computing *** investigate the research state-of-the-art on the migration of existing software systems to mobile computing *** aim to analyze the progression and impacts of existing research,highlight challenges and solutions that reflect dimensions of emerging and futuristic *** followed evidence-based software engineering(EBSE)method to conduct a systematic mapping study(SMS)of the existing research that has progressed over more than a decade(25 studies published from 1996–2017).We have derived a taxonomical classification and a holistic mapping of the existing research to investigate its progress,impacts,and potential areas of futuristic research and *** SMS has identified three types of migration namely Static,Dynamic,and State-based Migration of existing software systems to mobile computing *** to mobile computing platforms enables existing software systems to achieve portability,context-sensitivity,and high ***,mobile systems may face some challenges such as resource poverty,data security,and *** emerging and futuristic research aims to support patterns and tool support to automate the migration *** results of this SMS can benefit researchers and practitioners-by highlighting challenges,solutions,and tools,etc.,-to conceptualize the state-of-the-art and futuristic trends that support migration of existing software to mobile computing.

关键词： evidence-based software engineering mapping study software evolution mobile computing

SPT based determination of undrained shear strength:Regression models and machine learning

在线全文

学校读者我要写书评

暂无评论

Frontiers of Structural and Civil Engineering 2020年第1期14卷 185-198页

作者： Walid khalid MBARAK Esma Nur CINICIOGLU Ozer CINICIOGLU Department of Civil Engigeering Bogazici UniversityIstanbul 34342Turkey School of Business Quantitative Methods DivisionIstanbul UniversityIstanbul 34320Turkey

The purpose of this study is the accurate prediction of undrained shear strength using Standard Penetration Test results and soil consistency indices,such as water content and Atterberg *** this study,along with the conventional methods of simple and multiple linear regression models,three machine learning algorithms,random forest,gradient boosting and stacked models,are developed for prediction of undrained shear *** models are employed on a relatively large data set from different projects around Turkey covering 230 *** an improvement over the available studies in literature,this study utilizes correct statistical analyses techniques on a relatively large database,such as using a train/test split on the data set to avoid overfitting of the developed ***,the validity and consistency of the prediction results are ensured with the correct use of statistical measures like p-value and cross-validation which were missing in previous *** compare the performances of the models developed in this study with the prior ones existing in literature,all models were applied on the test data set and their performances are evaluated in terms of the resulting root mean squared error(RMSE)values and coefficient of determination(R^2).Accordingly,the models developed in this study demonstrate superior prediction capabilities compared to all of the prior ***,to facilitate the use of machine learning algorithms for prediction purposes,entire source code prepared for this study and the collected data set are provided as supplements of this study.

关键词： undrained shear strength linear regression random forest gradient boosting machine learning standard penetration test