检索结果-南通市图书馆

Application of coupled XFEM-BCQO in the structural optimization of a circular tunnel lining subjected to a ground motion

在线全文

学校读者我要写书评

暂无评论

Frontiers of Structural and Civil Engineering 2019年第6期13卷 1495-1509页

作者： Nazim Abdul NARIMAN Ayad mohammad RAMADAN Ilham Ibrahim mohammad Department of Civil Engineering Tishk International University-SulaimaniSulaimaniya 46001Iraq Mathematics Department-College of Science Sulaimani UniversitySulaimaniya 46001Iraq

A new structural optimization method of coupled extended finite element method and bound constrained quadratic optimization method(XFEM-BCQO)is adopted to quantify the optimum values of four design parameters for a circular tunnel lining when it is subjected to *** parameters are:tunnel lining thickness,tunnel diameter,tunnel lining concrete modulus of elasticity and tunnel lining concrete ***-Carlo sampling method is dedicated to construct the meta models so that to be used for the BCQO method using matlab *** simulations of the tensile damage in the tunnel lining due to a real earthquake in the literature are created for three design *** approach is used to show the cracks for the mentioned design *** results of the BCQO method for the maximum design case for the tunnel tensile damage was matching the results obtained from XFEM approach to a fair *** new coupled approach manifested a significant capability to predict the cracks and spalling of the tunnel lining concrete under the effects of dynamic earthquakes.

关键词： ovaling deformation monte carlo sampling XFEM-BCQO maximum principal stress

A Hybrid Approach for Performance and Energy-Based Cost Prediction in Clouds

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2021年第9期68卷 3531-3562页

作者： mohammad Aldossary Department of Computer Science College of Arts and SciencePrince Sattam Bin Abdulaziz UniversityAl-KharjSaudi Arabia

With the striking rise in penetration of Cloud Computing,energy consumption is considered as one of the key cost factors that need to be managed within cloud providers’***,recent approaches and strategies based on reactive and proactive methods have been developed for managing cloud computing resources,where the energy consumption and the operational costs are ***,to make better cost decisions in these strategies,the performance and energy awareness should be supported at both Physical Machine(PM)and Virtual Machine(VM)***,in this paper,a novel hybrid approach is proposed,which jointly considered the prediction of performance variation,energy consumption and cost of heterogeneous *** approach aims to integrate auto-scaling with live migration as well as maintain the expected level of service performance,in which the power consumption and resource usage are utilized for estimating the VMs’total ***,the service performance variation is handled by detecting the underloaded and overloaded PMs;thereby,the decision(s)is made in a cost-effective *** testbed evaluation demonstrates that the proposed approach not only predicts the VMs workload and consumption of power but also estimates the overall cost of live migration and auto-scaling during service operation,with a high prediction accuracy on the basis of historical workload patterns.

关键词： Cloud computing energy efficiency auto-scaling live migration workload prediction energy prediction cost estimation

Design of an Executable ANFIS-based Control System to Improve the Attitude and Altitude Performances of a Quadcopter Drone

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Automation and computing 2021年第1期18卷 124-140页

作者： mohammad Al-Fetyani mohammad Hayajneh Adham Alsharkawi Department of Mechatronics Engineering The University of JordanAmman11942Jordan Department of Mechatronics Engineering The Hashemite UniversityZarqa13133Jordan

Nowadays,quadcopters are presented in many life applications which require the performance of automatic takeoff,trajectory tracking,and automatic ***,researchers are aiming to enhance the performance of these vehicles through low-cost sensing solutions and the design of executable and robust control *** to high nonlinearities,strong couplings and under-actuation,the control design process of a quadcopter is a rather challenging ***,the main objective of this work is demonstrated through two main *** first is the design of an adaptive neuro-fuzzy inference system(ANFIS)controller to develop the attitude and altitude of a *** second is to create a systematic framework for implementing flight controllers in embedded systems.A suitable model of the quadcopter is also developed by taking into account aerodynamics *** show the effectiveness of the ANFIS approach,the performance of a well-trained ANFIS controller is compared to a classical proportional-derivative(PD)controller and a properly tuned fuzzy logic *** controllers are compared and tested under several different flight conditions including the capability to reject external *** the first stage,performance evaluation takes place in a nonlinear simulation ***,the ANFIS-based controllers alongside attitude and position estimators,and precision landing algorithms are implemented for executions in a real-time *** precision landing systems,an IR-camera is used to detect an IR-beacon on the ground for precise *** flight tests of a quadcopter are conducted for results *** simulations and experiments demonstrated superior results for quadcopter stability in different flight scenarios.

关键词： Quadcopter proportional integral derivate(PID)control fuzzy control adaptive neuro-fuzzy altitude control attitude control

A Review of Dynamic Resource Management in Cloud Computing Environments

在线全文

学校读者我要写书评

暂无评论

Computer Systems Science & Engineering 2021年第3期36卷 461-476页

作者： mohammad Aldossary Department of Computer Science College of Arts and SciencePrince Sattam bin Abdulaziz UniversityAl-KharjSaudi Arabia

In a cloud environment, Virtual Machines (VMs) consolidation andresource provisioning are used to address the issues of workload *** consolidation aims to move the VMs from one host to another in order toreduce the number of active hosts and save power. Whereas resource provisioningattempts to provide additional resource capacity to the VMs as needed in order tomeet Quality of Service (QoS) requirements. However, these techniques have aset of limitations in terms of the additional costs related to migration and scalingtime, and energy overhead that need further consideration. Therefore, this paperpresents a comprehensive literature review on the subject of dynamic resourcemanagement (i.e., VMs consolidation and resource provisioning) in cloud computing environments, along with an overall discussion of the closely relatedworks. The outcomes of this research can be used to enhance the developmentof predictive resource management techniques, by considering the awareness ofperformance variation, energy consumption and cost to efficiently manage thecloud resources.

关键词： Cloud computing resource management VM consolidation live migration resource provisioning auto-scaling

Rhizobacteria facilitate physiological and biochemical drought tolerance of Halimodendron halodendron (Pall.) Voss

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 Arid Land 2023年第2期15卷 205-217页

作者： mohammad Hossein TAGHIZADEH mohammad FARZAM Jafar NABATI Department of Range and Watershed Management Ferdowsi University of MashhadMashhad ***Iran Legume Department Research Center for Plant SciencesFerdowsi University of MashhadMashhad ***Iran

Growth-promoting bacteria(GPB)have shown promising effects on serving plants against environmental constraints such as ***,simultaneous effects of different GPB have less been considered for arid land plants and under field *** investigated the effects of single and combined application of GPB,including free-living nitrogen-fixing bacteria(NFB),phosphate solubilizing bacteria(PSB),potassium solubilizing bacteria(KSB),a combination of NFB,PSB,and KSB(NPK),and control,at three drought stress *** order to better understand the interactions between drought and GPB,we measured the morphological,biochemical,and physiological plant *** target plant was salt tree(Halimodendron Halodendron(Pall.)Voss),a legume shrub native to arid lands of Central and West *** biofertilizer treatments enhanced the growth,physiology,and biochemistry of salt tree seedlings,and there were significant differences among the *** and PSB treatments increased photosynthetic pigments,but KSB treatment was more efficient in transpiration rate and stomatal regulation and increased the soluble *** treatment had the highest effect on root traits,such as taproot length,root volume,cumulative root length,and the ratio of root to *** treatment enhanced root diameter and induced biomass translocation between root ***,only the application of mixed biofertilizer(i.e.,NPK treatment)was the most significant treatment to improve all plant morphological and physiological characteristics of salt tree under drought ***,our results provided improvement of some specific plant traits simultaneous with application of three biofertilizers to increase growth and establishment of salt tree seedlings in the degraded arid lands.

关键词： growth-promoting bacteria physiological traits drought stress biofertilizer root traits Halimodendron Halodendron(Pall.)Voss

Stochastic price based coordinated operation planning of energy storage system and conventional power plant

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2019年第5期7卷 1020-1032页

作者： mohammad Reza SHEIBANI Gholam Reza YOUSEFI mohammad Amin LATIFY Department of Electrical and Computer Engineering Isfahan University of TechnologyIsfahan 84156-83111Iran

A generation company(GENCO)which has a conventional power plant(CPP)intends to add an energy storage system(ESS)beside the CPP to increase its flexibility and *** this purpose,a new model is proposed for coordinated operation planning of the CPP and ESS in energy and spinning reserve markets in the presence of a bilateral *** proposed model is based on the stochastic price based unit commitment(PBUC)and price based storage commitment(PBSC).The uncertainties of the energy and spinning reserve prices and delivery requests in the spinning reserve market are modeled via scenarios based upon historical *** proposed model maximizes the profitability of the ESS beside the CPP and encourages the GENCO to invest the *** technology options to use beside the CPP are determined by economic *** results show that utilization of ESSs improves the technical operation of CPPs,as well as GENCOs’profitability.

关键词： Energy storage system Conventional power plant Operation planning Price based unit commitment

Comparative Study of Machine Learning Modeling for Unsteady Aerodynamics

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第7期72卷 1901-1920页

作者： mohammad Alkhedher Mechanical Engineering Department Abu Dhabi UniversityAbu DhabiUnited Arab Emirates

Modern fighters are designed to fly at high angle of attacks reaching 90 deg as part of their routine *** maneuvers generate complex nonlinear and unsteady aerodynamic *** this study,different aerodynamic prediction tools are investigated to achieve a model which is highly accurate,less computational,and provides a stable prediction of associated unsteady aerodynamics that results from high angle of attack *** prediction tools include Artificial Neural Networks(ANN)model,Adaptive Neuro Fuzzy Logic Inference System(ANFIS),Fourier model,and Polynomial Classifier Networks(PCN).Themain aim of the predictionmodel is to estimate the pitch moment and the normal force data obtained from forced tests of unsteady delta-winged aircrafts performing high angles of attack *** investigation includes three delta wing models with 1,1.5,and 2 aspect ratios with four determined variables:change rate in angle of attack(0 to 90 deg),non-dimensional pitch rate(0 to.06),and angle of *** a comprehensive analysis of the proposed identification methods,it was found that the newly proposed model of PCN showed the least error in modeling and prediction *** on prediction capabilities,it is seen that polynomial networks modeling outperformed ANFIS and ANN for the present nonlinear problem.

关键词： Unsteady aerodynamics supermaneuverability identification neuro-fuzzy polynomial networks neural networks

Multi-Layer Fog-Cloud Architecture for Optimizing the Placement of IoT Applications in Smart Cities

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2023年第4期75卷 633-649页

作者： mohammad Aldossary Department of Computer Science College of Arts and SciencePrince Sattam bin Abdulaziz UniversityAl-KharjSaudi Arabia

In the smart city paradigm, the deployment of Internet of Things(IoT) services and solutions requires extensive communication and computingresources to place and process IoT applications in real time, which consumesa lot of energy and increases operational costs. Usually, IoT applications areplaced in the cloud to provide high-quality services and scalable ***, the existing cloud-based approach should consider the above constraintsto efficiently place and process IoT applications. In this paper, anefficient optimization approach for placing IoT applications in a multi-layerfog-cloud environment is proposed using a mathematical model (Mixed-Integer Linear Programming (MILP)). This approach takes into accountIoT application requirements, available resource capacities, and geographicallocations of servers, which would help optimize IoT application placementdecisions, considering multiple objectives such as data transmission, powerconsumption, and cost. Simulation experiments were conducted with variousIoT applications (e.g., augmented reality, infotainment, healthcare, andcompute-intensive) to simulate realistic scenarios. The results showed thatthe proposed approach outperformed the existing cloud-based approach interms of reducing data transmission by 64% and the associated processingand networking power consumption costs by up to 78%. Finally, a heuristicapproach was developed to validate and imitate the presented approach. Itshowed comparable outcomes to the proposed model, with the gap betweenthem reach to a maximum of 5.4% of the total power consumption.

关键词： IoT application placement fog-cloud computing power consumption data transmission optimization smart cities

Simulation of the Internal Wave of a Subsurface Vehicle in a Two-Layer Stratified Fluid

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 Ocean University of China 2020年第6期19卷 1255-1264页

作者： AKBARNEJAD BAIE mohammad PIROOZNIA Mahmood AKBARINASAB mohammad Department of Physical Oceanography Science and Research BranchIslamic Azad UniversityTehran ***Iran Department of Geodesy K.N.Toosi University of TechnologyTehran ***Iran Department of Physical Oceanography University of MazandaranBabol ***Iran

Internal waves are one of the various phenomena that occur at sea,and they affect acoustic equipment and sea density measurement *** this study,internal waves are simulated using computational fluid dynamics method in the presence of a submarine in a pre-stratified *** scenarios were implemented by Froude number changes and submersible velocity by using the Navier-Stokes k-εturbulence *** indicate that the realizable k-εturbulence model gives better results than the RNG k-εmodel and the internal waves flow in this model are well represented,which increases the wavelength of the internal waves by increasing the Froude number and floating velocity,while the internal angle of the Kelvin waves is *** also observe that increasing the floating velocity causes the turbulent velocity contours to increase due to the drag coefficient and its relationship with the Reynolds *** Reynolds number increases with the increasing velocity of the float *** results indicate the efficiency of this method in the discovery of subsurface objects.

关键词： internal waves numerical simulation computational fluid dynamics turbulence models