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Measuring quality of experience for 360-degree videos in virtual reality

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Science China(Information Sciences) 2020年第10期63卷 108-122页

作者： muhammad Shahid ANWAR Jing WANG Asad ULLAH wahab KHAN Sadique AHMAD Zesong FEI School of Information and Electronics Beijing Institute of Technology Faculty of Engineering Sciences and Technology Iqra University

In recent years, we witness dramatic growing attention in immersive media technologies like 360-degree videos and virtual reality(VR). However, measuring the quality-of-experience(QoE) for 360-degree VR videos is not a trivial task. Streaming such videos to head mounted displays(HMDs) is extremely bandwidth-demanding when compared to traditional 2D videos. In HTTP adaptive streaming, QoE tends to deteriorate significantly during fluctuating network conditions, which results in various bitrate changes and causes multiple stalling events during playback. Thus, understanding how the human visual system perceives 360-degree video with the effect of stalling and different bitrate levels becomes inevitable. In this paper, we investigate the impact of stalling on users QoE under different bitrate levels and the interaction between stalling event and bitrate level for 360-degree videos in VR. To aim this, we first build a 360-degree videos database by encoding videos in three different bitrate levels(1, 5, and 15 Mbps) with 4 K resolutions(3840×1920 pixels). We then simulate various stalling events in the videos and conduct a subjective experiment in a virtual reality environment to investigate the human responses. Finally, we use a Bayesian method to estimate and predict the QoE while measuring the quality drop owing to various stalling events and bitrate changes. Proposed solution and prediction results show a strong dependency between playback stalling and bitrate of 360-degree video in VR. Stalling always impacts the QoE of 360-degree videos, but the strength of this negative impact depends on the video bitrate level. The adverse effect of stalling events is more profound when bitrate level approaches to the high and low end, which is in close agreement with subjective opinion.

关键词： quality of experience stalling virtual reality 360-degree video

DETECTION OF ELECTROMAGNETIC INCLUSIONS USING TOPOLOGICAL SENSITIVITY

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Journal of Computational Mathematics 2017年第5期35卷 642-671页

作者： Abdul wahab Tasawar Abbas Naveed Ahmed Qazi muhammad Zaigham Zia Bio Imaging and Signal Processing Lab. Department of Bio and Brain Engineering Korea Advanced Institute of Science and Technology 305-701 Daejeon Korea Department of Mathematics and Statistics Faculty of Basic and Applied Sciences International Islamic University 44000 Islamabad Pakistan Weierstrass Institute for Applied Analysis and Stochastics Leibniz Institute in Forschungsverbund Berlin e. V. (WIAS) Mohrenstr. 39 10117 Berlin Germany Department of Mathematics COMSATS Institute of Information Technology Islamabad Campus Park Road Chak Shahzad 44000 Islamabad Pakistan

In this article, a topological sensitivity framework for far-field detection of a diamet- rically small electromagnetic inclusion is established. The cases of single and multiple measurements of the electric far-field scattering amplitude at a fixed frequency are tak- en into account. The performance of the algorithm is analyzed theoretically in terms of its resolution and sensitivity for locating an inclusion. The stability of the framework with respect to measurement and medium noises is discussed. Moreover, the quantitative results for signal-to-noise ratio are presented. A few numerical results are presented to illustrate the detection capabilities of the proposed framework with single and multiple measurements.

关键词： Electromagnetic imaging Topological derivative Localization Resolution analysis Stability analysis Medium noise Measurement noise.

Rheological and Spectroscopic Characterization of Recycled Blend Containing Commonly Used Plastics of Daily Life

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材料科学与工程（中英文A版） 2012年第7期2卷 494-500页

作者： Umer Mehmood Ghulam Mustafa Mamoor wahab Shahid Amir Mushtaq Umer amjad muhammad Bilal Polymer and Process Engineering Department University of Engineering and Technology Lahore Pakistan

Modified 2 Satisfiability Reverse Analysis Method via Logical Permutation Operator

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Computers, Materials & Continua 2023年第2期74卷 2853-2870页

作者： Siti Zulaikha Mohd Jamaludin MohdAsyraf Mansor Aslina Baharum Mohd Shareduwan Mohd Kasihmuddin Habibah A.wahab muhammad Fadhil Marsani School of Mathematical Sciences Universiti Sains MalaysiaMindenPenang11800Malaysia School of Distance Education Universiti Sains MalaysiaMindenPenang11800Malaysia Faculty of Computing and Informatics Universiti Malaysia SabahJalan UMSKota Kinabalu88450SabahMalaysia School of Pharmaceutical Sciences Universiti Sains MalaysiaMindenPenang11800Malaysia

The effectiveness of the logic mining approach is strongly correlated to the quality of the induced logical representation that represent the behaviour of the ***,the optimum induced logical representation indicates the capability of the logic mining approach in generalizing the real datasets of different variants and *** main issues with the logic extracted by the standard logic mining techniques are lack of interpretability and the weakness in terms of the structural and arrangement of the 2 Satisfiability logic causing lower *** address the issues,the logical permutation serves as an alternative mechanism that can enhance the probability of the 2 Satisfiability logical rule becoming true by utilizing the definitive finite arrangement of *** work aims to examine and analyze the significant effect of logical permutation on the performance of data extraction ability of the logic mining approach incorporated with the recurrent discrete Hopfield Neural *** on the theory,the effect of permutation and associate memories in recurrent Hopfield Neural Network will potentially improve the accuracy of the existing logic mining *** validate the impact of the logical permutation on the retrieval phase of the logic mining model,the proposed work is experimentally tested on a different class of the benchmark real datasets ranging from the multivariate and timeseries *** experimental results show the significant improvement in the proposed logical permutation-based logic mining according to the domains such as compatibility,accuracy,and competitiveness as opposed to the plethora of standard 2 Satisfiability Reverse Analysis methods.

关键词： Logic mining logical permutation discrete hopfield neural network knowledge extraction

Aggregation Operators for Decision Making Based on q-Rung Orthopair Fuzzy Hypersoft Sets:An Application in Real Estate Project

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Computer Modeling in Engineering & Sciences 2023年第9期136卷 3141-3156页

作者： Salma Khan muhammad Gulistan Nasreen Kausar Dragan Pamucar Tzung-Pei Hong Hafiz Abdul wahab Department of Mathematics and Statistics Hazara University Mansehra21120Pakistan Department of Mathematics Faculty of Arts and SciencesYildiz Technical UniversityEsenlerIstanbul34210Turkey Faculty of Organizational Sciences University of BelgradeBelgrade11000Serbia Department of Computer Science and Information Engineering National University of KaohsiungKaohsiung804Taiwan Department of Computer Science and Engineering National Sun Yat-sen UniversityKaohsiung804Taiwan

In this paper,a decision-making problem with a q-rung orthopair fuzzy hypersoft environment is developed,and two operators of ordered weighted average and induced ordered weighted average are *** fundamental features are also *** induced ordered weighted average operator is essential in a q-ROFH environment as the induced ordered aggregation operators are special cases of the existing aggregation operators that already exist in q-ROFH *** main function of these operators is to help decision-makers gain a complete understanding of uncertain *** proposed aggregation operator is applied to a decision-making problem,with the aim of selecting the most promising real estate project for investment.

关键词： Hypersoft set q-rung orthopair fuzzy hypersoft set induced aggregation operator decision-making

A Fully Coupled Thermomechanical Model of Friction Stir Welding(FSW) and Numerical Studies on Process Parameters of Lightweight Aluminum Alloy Joints

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Acta Metallurgica Sinica(English Letters) 2018年第1期31卷 1-18页

作者： Saad B.Aziz Mohammad W.Dewan Daniel J.Huggett muhammad A.wahab Ayman M.Okeil T.Warren Liao Department of Mechanical and Industrial Engineering Louisiana State University Department of Civil and Environmental Engineering Louisiana State University

This paper presents a new thermomechanical model of friction stir welding which is capable of simulating the three major steps of friction stir welding （FSW） process, i.e., plunge, dwell, and travel stages. A rate-dependent Johnson- Cook constitutive model is chosen to capture elasto-plastic work deformations during FSW. Two different weld schedules （i.e., plunge rate, rotational speed, and weld speed） are validated by comparing simulated temperature profiles with experimental results. Based on this model, the influences of various welding parameters on temperatures and energy generation during the welding process are investigated. Numerical results show that maximum temperature in FSW process increases with the decrease in plunge rate, and the frictional energy increases almost linearly with respect to time for different rotational speeds. Furthermore, low rotational speeds cause inadequate temperature distribution due to low frictional and plastic dissipation energy which eventually results in weld defects. When both the weld speed and rotational speed are increased, the contribution of plastic dissipation energy increases significantly and improved weld quality can be expected.

关键词： Aluminum alloy Friction stir welding Temperature distribution Plastic energy Frictional energy Rate-dependent model Friction modeling

Impact of Friction Stir Welding (FSW) Process Parameters on Thermal Modeling and Heat Generation of Aluminum Alloy Joints

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Acta Metallurgica Sinica(English Letters) 2016年第9期29卷 869-883页

Friction stir welding （FSW） is a solid-state joining process, where joint properties largely depend on the amount of heat generation during the welding process. The objective of this paper was to develop a numerical thermomechanical model for FSW of aluminum--copper alloy AA2219 and analyze heat generation during the welding process. The thermomechanical model has been developed utilizing ANSYS APDL. The model was verified by comparing simulated temperature profile of three different weld schedules （i.e., different combinations of weld parameters in real weld situations） from simulation with experimental results. Furthermore, the verified model was used to analyze the effect of different weld parameters on heat generation. Among all the weld parameters, the effect of rotational speed on heat generation is the highest.

关键词： Friction stir welding Frictional dissipation energy Temperature distribution Friction modeling Aluminum alloy

Sorption and Desorption Behavior of FTuoroquinolone Antibiotics in an Agricultural Soil

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Pedosphere 2019年第5期29卷 676-680页

作者： Luqman RIAZ Tariq MAHMOOD YANG Qingxiang muhammad wahab YASIR Audil RASHID Mark S. COYNE Elisa D’ANGELO College of Life Sciences Henan Normal UniversityXinxiang 453007 (China) Department of Environmental Sciences Pit Mehr All Shah Arid Agriculture UniversityRawalpindi 46000 (Pakistan) Department of Plant & Soil Sciences University of KentuckyLexington KY /05/6-0091 (USA)

Dear Editor, Fluoroquinolones (e.g., ciprofloxacin (CIP), enrofloxacin (ENR), and levofloxacin (LEV)) are an extensively used family of antibiotics prescribed for various infections;however, they are also increasingly used to promote livestock growth. After oral administTation, much of the parent compound is excreted via urine and feces and can enter the environment at a high concentration. These antibiotics are only partially removed in wastewater treatment plants and become a part of the environment through irrigation practices.

关键词： CIP parent compound wastewater treatment

Prevalence and associated factors of stress, anxiety and depression among emergency medical officers in Malaysian hospitals

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World Journal of Emergency Medicine 2018年第3期9卷 178-186页

作者： Siti Nasrina Yahaya Shaik Farid Abdull wahab muhammad Saiful Bahribin Yusoff Mohd Azhar Mohd Yasin Mohammed Alwi Abdul Rahman Emergency and Trauma Department School of Medical Sciences University Sains Malaysia Kelantan Malaysia Department of Medical Education School of Medical Sciences University Sains Malaysia Kelantan Malaysia Department of Psychiatry School of Medical Sciences University Sains Malaysia Kelantan Malaysia Emergency and Trauma Department Selayang Hospital Selangor Darul Ehsan Malaysia

BACKGROUND： Demanding profession has been associated with poor psychological health due to multiple factors such as overworking hours and night shifts. This study is to determine prevalence and associated factors of depression, anxiety and stress among medical officers working at emergency department in Malaysian ***： A cross-sectional study was conducted on 140 emergency department medical officers working at general hospitals from seven Malaysia regions. They were randomly selected and their depression, anxiety and stress level were measured by the 21-item Depression, Anxiety, Stress Scale. RESULTS： The highest prevalence was anxiety （28.6%） followed by depression （10.7%） and stress （7.9%）. Depression, anxiety and stress between seven hospitals were not significantly different （P〉0.05）. Male medical officers significantly experienced more anxiety symptoms than female medical officers （P=0.0022）, however depression and stress symptoms between male and female medical officers were not signi？ cantly different （P〉0.05）. Depression, anxiety and stress were not associated with age, working experience, ethnicity, marital status, number of shifts and type of system adopted in different hospitals （P〉0.05）. CONCLUSION： The prevalence of anxiety was high, whereas for depression and stress were considerably low. Gender was the only factor significantly associated with anxiety. Other factors were not associated with depression, anxiety and stress. Future research should aim to gain better understanding on unique factors that affect female and male medical officers’ anxiety level in emergency setting, thus guide authorities to chart strategic plans to remedy this condition.

关键词： Medical officers Emergency department Depression Anxiety Stress