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An Effective and Secure Quality Assurance System for a Computer Science Program

Computer Systems Science & Engineering 2022年第6期41卷 975-995页

作者： mohammad Alkhatib Computer Science Department College of Computer and Information SciencesImam Mohammad Ibn Saud Islamic University(IMSIU)RiyadhSaudi Arabia

Improving the quality assurance (QA) processes and acquiring accreditation are top priorities for academic programs. The learning outcomes (LOs)assessment and continuous quality improvement represent core components ofthe quality assurance system (QAS). Current assessment methods suffer deficiencies related to accuracy and reliability, and they lack well-organized processes forcontinuous improvement planning. Moreover, the absence of automation, andintegration in QA processes forms a major obstacle towards developing efficientquality system. There is a pressing need to adopt security protocols that providerequired security services to safeguard the valuable information processed byQAS as well. This research proposes an effective methodology for LOs assessment and continuous improvement processes. The proposed approach ensuresmore accurate and reliable LOs assessment results and provides systematic wayfor utilizing those results in the continuous quality improvement. This systematicand well-specified QA processes were then utilized to model and implement automated and secure QAS that efficiently performs quality-related processes. Theproposed system adopts two security protocols that provide confidentiality, integrity, and authentication for quality data and reports. The security protocols avoidthe source repudiation, which is important in the quality reporting system. This isachieved through implementing powerful cryptographic algorithms. The QASenables efficient data collection and processing required for analysis and interpretation. It also prepares for the development of datasets that can be used in futureartificial intelligence (AI) researches to support decision making and improve thequality of academic programs. The proposed approach is implemented in a successful real case study for a computer science program. The current study servesscientific programs struggling to achieve academic accreditation, and gives rise tofully automating and integrating the

关键词： Quality assurance information security cryptographic algorithms education programs

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Impact of industrial effluent on growth and yield of rice(Oryza sativa L.) in silty clay loam soil

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Journal of Environmental Sciences 2015年第4期27卷 231-240页

作者： mohammad Anwar Hossain Golum Kibria Muhammad Mustafizur Rahman mohammad Mizanur Rahman Abul Hossain Molla mohammad Mostafizur Rahman mohammad Khabir Uddin Department of Environmental Sciences Jahangirnagar University Department of Soil Science Bangabandhu Sheikh Mujibur Rahman Agricultural University Department of Bioenvironmental Science Bangabandhu Sheikh Mujibur Rahman Agricultural University

Degradation of soil and water from discharge of untreated industrial effluent is alarming in Bangladesh. Therefore, buildup of heavy metals in soil from contaminated effluent, their entry into the food chain and effects on rice yield were quantified in a pot experiment. The treatments were comprised of 0, 25%, 50%, 75% and 100% industrial effluents applied as irrigation water. Effluents, initial soil, different parts of rice plants and post-harvest pot soil were analyzed for various elements, including heavy metals. Application of elevated levels of effluent contributed to increased heavy metals in pot soils and rice roots due to translocation effects, which were transferred to rice straw and grain. The results indicated that heavy metal toxicity may develop in soil because of contaminated effluent *** metals are not biodegradable, rather they accumulate in soils, and transfer of these metals from effluent to soil and plant cells was found to reduce the growth and development of rice plants and thereby contributed to lower yield. Moreover, a higher concentration of effluent caused heavy metal toxicity as well as reduction of growth and yield of rice, and in the long run a more aggravated situation may threaten human lives,which emphasizes the obligatory adoption of effluent treatment before its release to the environment, and regular monitoring by government agencies needs to be ensured.

关键词： Biomass Crop yield Heavy metal Industrial effluent Soil pollution

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Spatial pattern of tree diversity and evenness across forest types in Majella National Park,Italy

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Forest Ecosystems 2015年第4期2卷 304-313页

作者： mohammad Redowan Department of Forestry and Environmental Science Shahjalal University of Science and Technology

Background： Estimation of tree diversity at broader scale is important for conservation planning. Tree diversity should be measured and understood in terms of diversity and evenness, two integral components to describe the structure of a biological community. Variation of the tree diversity and evenness with elevation, topographic relief, aspect, terrain shape, slope, soil nutrient, solar radiation etc. are well documented. Methods： Present study explores the variation of tree diversity （measured as Shannon diversity and evenness indices） of Majella National Park, italy with five available forest types namely evergreen oak woods, deciduous oak woods, blacWaleppo pine stands, hop-hornbeam forest and beech forest, using satellite, environmental and field data. Results： Hop-hornbeam forest was found to be most diverse and even while evergreen Oak woods was the lowest diverse and even. Diversity and evenness of forest types were concurrent to each other i.e. forest type which was more diverse was also more even. As a broad pattern, majority portion of the study area belonged to medium diversity and high evenness class. Conclusions： Satellite images and other GIS data proved useful tools in monitoring variation of tree diversity and evenness across various forest types. Present study findings may have implications in prioritizing conservation zones of high tree diversity at Majella.

关键词： Tree diversity Tree evenness Forest type Shannon diversity index Shannon evenness index Neural network Kappa statistic

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Tensile properties and hot tearing susceptibility of cast Al–Cu alloys containing excess Fe and Si

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International Journal of Minerals,Metallurgy and Materials 2021年第4期28卷 718-728页

作者： Khalil Ganjehfard Reza Taghiabadi mohammad Talafi Noghani mohammad Hossein Ghoncheh Faculty of Engineering Imam Khomeini International University(IKIU)QazvinIran Department of Mechanical Engineering University of New BrunswickFrederictonNBCanada

This study was undertaken to investigate the tensile properties and hot tearing susceptibility of cast Al–Cu alloys containing excess Fe(up to 1.5 wt%)and Si(up to 2.5 wt%).According to the results,the optimum tensile properties and hot tearing resistance were achieved at Fe/Si mass ratio of 1,where theα-Fe phase was the dominant Fe *** the Fe/Si mass ratio above unity increased the amounts of detrimentalβ-Cu Fe platelets in the microstructure,deteriorating the tensile properties and hot tearing *** the mass ratio below unity increased the size and fraction of Si needles and micropores in the microstructure,also impairing the tensile properties and hot tearing *** investigation of hot-torn surfaces revealed that theβ-Cu Fe platelets disrupted the tear healing phenomenon by blocking interdendritic feeding channels,while theα-Fe intermetallics improved the hot tearing resistivity due to their compact morphology and high melting point.

关键词： aluminum–copper alloys castability fluidity hot tearing susceptibility

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Probability calculation of rebars corrosion in reinforced concrete using css algorithms

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Journal of Central South University 2015年第8期22卷 3141-3150页

作者： Mohsen-Ali Shayanfar mohammad-Ali Barkhordari mohammad Ghanooni-Bagha The Centre of Excellence for Fundamental Studies in Structural Engineering Iran University of Science and TechnologyP.O.BOX: 16765-163 Narmak Tehran Iran

Reinforcement inside the concrete is protected from corrosion and its damages until several years after the construction. After corrosion initiation, the cross section of reinforcement begins to reduce and often load bearing of the reinforced concrete structure will be reduced significantly. Corrosion of reinforcements in concrete in polluted and contaminated areas can occur in two ways: chloride and carbonation. In this work, meta-heuristic approach of charged system search(CSS) is used to calculate corrosion occurrence probability due to chloride ions penetration. The model efficiency is verified by comparing the available examples in technical literature and results of Monte Carlo analysis. According to the analyses performed, using different probabilistic distributions regardless of probabilistic moments based on real distribution leads to diverse results. In addition, influence of each effective parameter in corrosion occurrence varies by changing other parameters.

关键词： reinforced concrete reliability index chloride diffusion carbonation charged system search (CSS) optimization

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Experimental investigation of shock-buffet criteria on a pitching airfoil

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Chinese Journal of Aeronautics 2022年第7期35卷 179-191页

作者： Mehran MASDARI Aghil ZEINALZADEH mohammad Ali ABDI mohammad Reza SOLTANI Faculty of New Sciences and Technologies University of TehranTehran ***Iran Department of Aerospace Engineering Sharif University of TechnologyTehran 11365-11155Iran Department of Aeronautical and Astronomical Engineering University of WashingtonSeattleWAUSA

An experimental investigation of the shock-buffet phenomenon subject to unsteady pitching supercritical airfoil around its quarter chord has been conducted in a transonic wind *** model was equipped with pressure taps connected to the fast response *** were conducted at different free-stream Mach number from 0.61 *** principle goal of this investigation was to experimentally discuss the shock-buffet criterion over a SC(2)-0410 supercritical pitching related to the hysteresis loops of total drag and trailing edge pressure,the behaviour of the shock wave foot location,the pressure distribution over the upper surface,and by implementing the wavelet analysis of the normal *** ensure capturing the buffet phenomenon by utilizing these criteria,a pressure port has been drilled exactly at the trailing edge of the airfoil where its output was used to detect the buffet phenomenon for different *** representation of the flow using the shadow graph flow visualization technique for different test cases is further used to illustrate the unsteady shock wave motion.A comparative analysis of experimental measurements shows that the conducted criteria confirm each other when the buffet phenomenon occurs at the position of the oscillating cycle.

关键词： Airfoil Buffeting Experimental analysis Hysteresis loops Pitching motion Shock wave Wavelet analysis

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Effect of Alkali and Silane Treatments on Mechanical and Fibre-matrix Bond Strength of Kenaf and Pineapple Leaf Fibres

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Journal of Bionic Engineering 2016年第3期13卷 426-435页

作者： mohammad Asim mohammad Jawaid Khalina Abdan Mohamad Ridzwan lshak Laboratory of Biocomposite Technology Institute of Tropieal Forestry and Forest Products (1NTR OP) Universiti Putra Malaysia Serdang 43400 Malaysia Department of Biological and Agricultural Engineering Faculty of Engineering Universiti Putra Malaysia Serdang 43400 Malaysia Department of Aerospace Engineering Universiti Putra Malaysia Serdang 43400 Malaysia

Natural fibres are very versatile materials, their properties vary with chemical composition and physical structure. The effects of alkali, silane and combined alkali and silane treatments on the mechanical （tensile）, morphological, and structural properties of Pine Apple Leave Fibres （PALF） and Kenaf Fibres （KF） were investigated with the aim to improve their com- patibility with polymer matrices. The effectiveness of the alkali and saline treatments in the removal of impurities from the fibre surfaces was confirmed by Scanning Electron Microscopy （SEM） and Fourier Transform Infrared spectrometry （FTIR） ob- servation. The morphological study of treated PALF and KF by SEM indicates that silane treated fibres have less impurities and lignin and hemicelluloses removed than those by other chemical treatments. Silane treated PALF and KF display better tensile strength than those of untreated, alkaline and NaOH-silane treated. Droplet test indicates that the lnterfacial Stress Strength （IFSS） of alkali and silane treated PALF and KF are enhanced whereas silane treated fibres display highest IFSS. It is assumed that fibre treatments will help to develop high performance KF and PALF reinforced polymer composites for industrial appli- cations.

关键词： pineapple leaves fibre kenaf fibre chemical treatment tensile properties structural properties droplet test

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Behavior Analysis of Biomimetic Soft Bending Actuators in Free Motion and Contact

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Journal of Bionic Engineering 2023年第3期20卷 967-981页

作者： mohammad Hadi Namdar Ghalati Sepideh Akbari Hamed Ghafarirad mohammad Zareinejad Department of Mechanical Engineering Amirkabir University of TechnologyTehran***Iran New Technologies Research Center(NTRC) Amirkabir University of TechnologyTehran***Iran

Bioinspired Soft Bending Actuators (SBA) are increasingly being used in rehabilitation, assistant robots, and grippers. Despite many investigations on free motion modeling, understanding how these actuators interact with the environment requires more detailed research. It is caused by high compliance and nonlinearity of bioinspired soft material, which leads to serious challenges in contact conditions. In this paper, a continuous deformation analysis is presented to describe the free motion nonlinear behavior of the actuator. Based on the achieved result, this study proposes static modeling of SBA affected by a concentrated external force. For this purpose, the finite rigid element method is utilized, which is based on discretizing the actuator into smaller parts and assuming these parts as rigid serial links connected by nonlinear torsional springs. To verify the proposed model, two kinds of forces are considered to be acting on the actuator, i.e. following force and constant direction force. In addition, the effect of gravity on the actuator configuration is also investigated. The validity of the model has been demonstrated through experiments in free motion, contact conditions and the presence of gravity. It generally shows that the prediction error of robot configuration is lower than 7.5%.

关键词： Biomimetic soft bending actuator Static modeling Contact Force constraints Rigid finite element

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Formation mechanism of Al2O3/MoS2 nanocomposite coating by plasma electrolytic oxidation(PEO)

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Plasma Science and Technology 2020年第6期22卷 144-155页

作者： Babak GHORBANIAN mohammad TAJALLY Seyed mohammad MOUSAVI KHOIE Hossein TAVAKOLI Faculty of Materials and Metallurgical Engineering Semnan UniversityPO Box 35131-19111SemnanIran Faculty of Mining and Metallurgical Engineering Amirkabir University of TechnologyPO Box 15875-4413 TehranIran

In this study,an Al2O3/MoS2 nanocomposite coating was created on an aluminum 1050 substrate using the plasma electrolytic oxidation *** zeta potential measurements showed that small MoS2 particles have negative potential and move toward the anode *** nanoparticles of MoS2 were found to have a zeta potential of-25 mV,which prevents suspension in the ***,to produce an Al2O3/MoS2 nanocomposite,one has to use the microparticles of *** X-ray diffraction analyses showed that the produced coatings containedα-Al2O3,γ-Al2O3,and MoS2,and that the size of MoS2 particles can be reduced to 30 *** was observed that prolonged suspension in the electrolyte results in an enhanced formation of an Al2O3/MoS2 *** the results,it was hypothesized that the mechanism of the formation of the Al2O3/MoS2 nanocomposite coating on the aluminum 1050 substrate is based on electrical energy discharge.

关键词： plasma electrolytic oxidation corrosion Al2O3/MoS2 nanocomposite tribology

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Improved prediction of shear wave velocity for clastic sedimentary rocks using hybrid model with core data

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第6期13卷 1466-1477页

作者： mohammad Islam Miah Department of Petroleum and Mining Engineering Chittagong University of Engineering and TechnologyChittagong4349Bangladesh

Accurate measurement of acoustic velocities of sedimentary rocks is essential for prediction of rock elastic constants and well failure analysis during drilling *** measurement by advanced logging tools such as dipole sonic imager is not always *** older wells,such data are not available in most ***,it is an alternate way to develop a reliable correlation to estimate the shear wave velocity from existing log and/or core *** objective of this research is to investigate the nature of dependency of different reservoir parameters on the shear wave velocity(VS) of clastic sedimentary rocks,and to identify the parameter/variable which shows the highest level of *** the study,data-driven connectionist models are developed using machine learning approach of least square support vector machine(LSSVM).The coupled simulated annealing(CSA) approach is utilized to optimize the tuning and kernel parameters in the model *** performance of the simulation-based model is evaluated using statistical *** is found that the most dependency predictor variable is the compressional wave velocity,followed by the rock porosity,bulk density and shale volume in turn.A new correlation is developed to estimate VS,which captures the most influential parameters of sedimentary *** new correlation is verified and compared with existing models using measured data of sandstone,and it exhibits a minimal error and high correlation coefficient(R^(2)-0.96).The hybridized LSSVM-CSA connectionist model development strategy can be applied for further analysis to predict rock mechanical ***,the improved correlation of VS can be adopted to estimate rock elastic constants and conduct wellbore failure analysis for safe drilling and field development decisions,reducing the exploration costs.

关键词： Machine learning Acoustic shear velocity Elastic constants Rock strength Geomechanics

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