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QAAS:quick accurate auto-scaling for streaming processing

Frontiers of computer science 2024年第1期18卷 5-15页

作者： Shiyuan LIU Yunchun LI Hailong YANG Ming DUN Chen CHEN Huaitao ZHANG Wei LI State Key Laboratory of Software Development Environment Beijing 100191China School of Computer Science and Engineering Beihang UniversityBeijing 100191China School of Cyber Science and Technology Beihang UniversityBeijing 100191China School of Computer Science and Technology Xi’an Jiaotong UniversityXi’an 710049China

In recent years,the demand for real-time data processing has been increasing,and various stream processing systems have *** the amount of data input to the stream processing system fluctuates,the computing resources required by the stream processing job will also *** resources used by stream processing jobs need to be adjusted according to load changes,avoiding the waste of computing *** present,existing works adjust stream processing jobs based on the assumption that there is a linear relationship between the operator parallelism and operator resource consumption(e.g.,throughput),which makes a significant deviation when the operator parallelism *** paper proposes a nonlinear model to represent operator *** divide the operator performance into three stages,the Non-competition stage,the Non-full competition stage,and the Full competition *** our proposed performance model,given the parallelism of the operator,we can accurately predict the CPU utilization and operator *** with actual experiments,the prediction error of our model is below 5%.We also propose a quick accurate auto-scaling(QAAS)method that uses the operator performance model to implement the auto-scaling of the operator parallelism of the Flink *** to previous work,QAAS is able to maintain stable job performance under load changes,minimizing the number of job adjustments and reducing data backlogs by 50%.

关键词： stream processing performance model auto-scaling

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Pavement Performance of Coal Gangue Sand-Asphalt Mixture

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Journal of engineering science and technology Review 2024年第5期17卷 145-152页

作者： Jing, Hongjun Gao, Rui Zhang, xiaozhou Li, Shaoping Yan, xile Liu, xiaohong College of Architecture and Civil Engineering Xi'an University of Science and Technology Xi'an710054 China Road Engineering Research Center Xi'an University of Science and Technology Xi'an710054 China Yulin Highway Bureau Yulin719099 China

Coal gangue is applicable to roadbed filling and base course of road engineering after breaking up, thus producing a large number of coal gangue sand. The in-situ stacking mode has caused serious damage to the ecological environment because it occupies extensive land resources. Reasonable disposal of coal gangue sand has important significance to the ecological environment. ATB-25 gradation was adopted to discuss the pavement performance of asphalt mixture prepared by replacing machine-made sand completely with coal gangue sand. Five test groups of non-mixture, fullmixture,full-mixture + 0.3% anti-rut agent, full-mixture + 0.4% anti-rut agent, and full-mixture + 0.5% anti-rut agent were designed. The Marshall stability test, Marshall residual stability test, freeze-thaw splitting test, and high-temperature rutting test under 60 ℃ were carried out. The effects of fine aggregate type and anti-rut agent content on the pavement performance of asphalt mixture were studied. The action mechanism of anti-rut agent on the coal gangue sand–asphalt mixture (CGS) was analyzed in combination with pavement performance test results. According to test results, the fine aggregate type can influence the performance of asphalt mixture, and the optimal asphalt content (OAC) of the CGS is increased significantly. The Marshall stability (MS) increases from 7.80 kN to 8.87 kN. After the machine-made sand is completely replaced by gangue sand, the water damage resistance and high-temperature deformation resistance of asphalt mixture decline significantly. With the increase in anti-rut agent content, the high-temperature deformation resistance of asphalt mixture increases gradually, but the water damage resistance of the mixture is not improved effectively. When the anti-rut agent content is 0.3%, the water stability of the asphalt mixture is damaged the least while assuring hightemperature stability. After mixing with the anti-rut agent, fine aggregates in the mixture will form group parti

关键词： Coal tailings

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Effects of thawing-induced softening on fracture behaviors of frozen rock

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Journal of Rock Mechanics and Geotechnical engineering 2024年第3期16卷 979-989页

作者： Ting Wang Hailiang Jia Qiang Sun xianjun Tan Liyun Tang College of Geology and Environment Xi’an University of Science and TechnologyXi’an710054China College of Architecture and Civil Engineering Xi’an University of Science and TechnologyXi’an710054China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430064China

Due to the presence of ice and unfrozen water in pores of frozen rock,the rock fracture behaviors are susceptible to *** this study,the potential thawing-induced softening effects on the fracture behaviors of frozen rock is evaluated by testing the tension fracture toughness(KIC)of frozen rock at different temperatures(i.e.-20℃,-15℃,-12℃,-10℃,-8℃,-6℃,-4℃,-2℃,and 0℃).Acoustic emission(AE)and digital image correlation(DIC)methods are utilized to analyze the microcrack propagation during *** melting of pore ice is measured using nuclear magnetic resonance(NMR)*** results indicate that:(1)The KIC of frozen rock decreases moderately between-20℃ and-4℃,and rapidly between-4℃ and 0℃.(2)At-20℃ to-4℃,the fracturing process,deduced from the DIC results at the notch tip,exhibits three stages:elastic deformation,microcrack propagation and microcrack ***,at-4℃e0℃,only the latter two stages are observed.(3)At-4℃e0℃,the AE activities during fracturing are less than that at-20℃ to-4℃,while more small events are reported.(4)The NMR results demonstrate a reverse variation trend in pore ice content with increasing temperature,that is,a moderate decrease is followed by a sharp decrease and-4℃ is exactly the critical ***,we interpret the thawing-induced softening effect by linking the evolution in microscopic structure of frozen rock with its macroscopic fracture behaviors as follow:from-20℃ to-4℃,the thickening of the unfrozen water film diminishes the cementation strength between ice and rock skeleton,leading to the decrease in fracture ***-4℃ to 0℃,the cementation effect of ice almost vanishes,and the filling effect of pore ice is reduced significantly,which facilitates microcrack propagation and thus the easier fracture of frozen rocks.

关键词： Frozen sandstone Different thawing temperature Fracture toughness Microcrack propagation process Unfrozen water content

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An Improved Genetic Algorithm for college Course Scheduling 19th

An Improved Genetic Algorithm for College Course Scheduling

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19th EAI International Conference on Heterogeneous Networking for Quality, Reliability, Security and Robustness, QShine 2023

作者： Wang, Chenle Wang, Bin International Engineering College Xi’an University of Technology Xi’an710048 China School of Computer Science and Engineering Xi’an University of Technology Xi’an710048 China

ISBN: (纸本)9783031651250

The course scheduling is a NP-complete problem. At present, various intelligent optimization algorithms have provided many feasible solutions to the course scheduling problem in colleges and universities, with differentiated advantages and disadvantages. This work tries to design a general and efficient algorithm to solve the large-scale course scheduling. In particular, we analyze and model the problem of course scheduling in colleges and universities, and put forward the improved genetic algorithm to solve the problem of large course scheduling under various constraints. First, the teaching task number is stored in a two-dimensional time-class matrix, which represents the information of teachers, and a two-dimensional classroom matrix is established to store the classroom information of the class. Next, we apply the improved genetic algorithm to cross and mutate the time-class matrix to obtain new individuals, thereby adjusting the corresponding classroom matrix. Then, the excellent individual is selected from the parent and child generation, and iterated until the optimal individual is produced. Finally, experimental results show that the convergence speed of the proposed algorithm is faster and higher fitness values can be obtained. © ICST Institute for computer sciences, Social Informatics and Telecommunications engineering 2024.

关键词： Scheduling algorithms

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Salp Swarm Incorporated Adaptive Dwarf Mongoose Optimizer with Lévy Flight and Gbest-Guided Strategy

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Journal of Bionic engineering 2024年第4期21卷 2110-2144页

作者： Gang Hu Yuxuan Guo Guanglei Sheng Department of Applied Mathematics Xi’an University of TechnologyXi’an710054People’s Republic of China School of Computer Science and Engineering Xi’an University of TechnologyXi’an710048People’s Republic of China Department of Electronics and Information Engineering Bozhou UniversityBozhou236800People’s Republic of China

In response to the shortcomings of Dwarf Mongoose Optimization(DMO)algorithm,such as insufficient exploitation capability and slow convergence speed,this paper proposes a multi-strategy enhanced DMO,referred to as ***,we propose an improved solution search equation that utilizes the Gbest-guided strategy with different parameters to achieve a trade-off between exploration and exploitation(EE).Secondly,the Lévy flight is introduced to increase the diversity of population distribution and avoid the algorithm getting stuck in a local *** addition,in order to address the problem of low convergence efficiency of DMO,this study uses the strong nonlinear convergence factor Sigmaid function as the moving step size parameter of the mongoose during collective activities,and combines the strategy of the salp swarm leader with the mongoose for cooperative optimization,which enhances the search efficiency of agents and accelerating the convergence of the algorithm to the global optimal solution(Gbest).Subsequently,the superiority of GLSDMO is verified on CEC2017 and CEC2019,and the optimization effect of GLSDMO is analyzed in *** results show that GLSDMO is significantly superior to the compared algorithms in solution quality,robustness and global convergence rate on most test ***,the optimization performance of GLSDMO is verified on three classic engineering examples and one truss topology optimization *** simulation results show that GLSDMO achieves optimal costs on these real-world engineering problems.

关键词： Dwarf mongoose optimization algorithm Gbest-guided Lévy flight Adaptive parameter Salp swarm algorithm engineering optimization Truss topological optimization

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Fabrication and evaluation of high-performance 3D interpenetrated network structures SiC/Al composites with high-purity plate-like a-SiC framework

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Journal of Materiomics 2024年第2期10卷 499-510页

作者： Jiawei xie Jinhui Zou Liangcheng Tong Syieluing Wong xin Guo Hang Qin Pengzhao Gao Wenming Guo Hanning xiao College of Materials Science and Engineering Hunan UniversityChangsha410082China Department of Chemical Engineering and Chemistry Eindhoven University of TechnologyEindhoven5612 AZNetherlands College of Automation and Information Engineering Xi'an University of TechnologyXi'an710048China

To reinforce compatibility with the thermophysical and mechanical properties of SiC/Al composites for electronic packaging to improve the stability and reduce fatigue failure of electronic integrated devices,a novel 3D SiC reinforced framework with interpenetrated plate-like a-SiC grains was synthesized.A small amount of doped a-SiC was seeded to induce the transformation of b-SiC to plate-like a-SiC at 2,300℃,forming a high-purity a-SiC strongly bonded ***/gas pressure infiltration of Al alloy was subsequently used to manufacture the 3D interpenetrated network structure SiC/Al(SiC3D/Al)*** results showed that 15%(in mass)seeds provided the composite with the optimal comprehensive performance,including a low coefficient of thermal expansion(CTE)of 5.54×10^(-6)K^(-1),a high thermal conductivity(l)of 239.08 W·m^(-1)·K^(-1),the highest flexural strength of 326.84 MPa,and a low thermal deformation parameter(TDP)of ***-purity plate-like grains enhanced the purity of the framework promoting a significant improvement in *** the seed content increased to 20%(in mass),both CTE and l reached optimal values of 5.22×10^(-6)K^(-1)and 243.14 W·m^(-1)·K^(-1),but the mechanical properties declined by 10.30%.The synergistic effect of the well-bonded interface and the high-purity 3D SiC framework balanced excellent mechanical properties and multiple thermal functions.

关键词： α-SiC seed Phase transformation Thermophysical properties SiC_(3D)/Al composites Electronic packaging

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TRE-DSP:A traceable and revocable CP-ABE based data sharing scheme for IoV with partially hidden policy

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Digital Communications and Networks 2025年第2期11卷 455-464页

作者： Yousheng Zhou Rundong Peng Yuanni Liu Pandi Vijayakumar Brij Gupta College of Computer Science and Technology Chongqing University of Posts and TelecommunicationsChongqing 400065China College of Cyber Security and Information Law Chongqing University of Posts and TelecommunicationsChongqing 400065China Department of Computer Science and Engineering University College of EngineeringTindivanamMelpakkamTamil nadu 604001India Department of Computer Engineering National Institute of Technology KurukshetraIndia

With the popularity of the Internet of Vehicles(IoV),a large amount of data is being generated every *** to securely share data between the IoV operator and various value-added service providers becomes one of the critical *** to its flexible and efficient fine-grained access control feature,Ciphertext-Policy Attribute-Based Encryption(CP-ABE)is suitable for data sharing in ***,there are many flaws in most existing CP-ABE schemes,such as attribute privacy leakage and key *** paper proposes a Traceable and Revocable CP-ABE-based Data Sharing with Partially hidden policy for IoV(TRE-DSP).A partially hidden access structure is adopted to hide sensitive user attribute values,and attribute categories are sent along with the ciphertext to effectively avoid privacy *** addition,key tracking and malicious user revocation are introduced with broadcast encryption to prevent key *** the main computation task is outsourced to the cloud,the burden of the user side is relatively *** of security and performance demonstrates that TRE-DSP is more secure and practical for data sharing in IoV.

关键词： Privacy-preserving Attribute-based encryption Partially hidden policy Traceability User revocation Internet of vehicles

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Text Representation Based on WT-GloVe Word Vector Weighting Model

Text Representation Based on WT-GloVe Word Vector Weighting ...

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2024 International Conference on Intelligent Computing and Robotics, ICICR 2024

作者： Xue, Cheng Fei, Rong Yao, Quanzhu School of Computer Science and Engineering Xi'An University of Technology Xi'an China School of Computer Science and Technology Xi'An University of Technology Xi'an China

ISBN: (纸本)9798350372274

The text representation issue in text classification is thoroughly examined in this paper, with a focus on handling massive volumes of text data. The paper suggests the word vector weighting model based on WT-GloVe in response to the issues with excessive sparsity and subpar classification performance that classic neural network text representation models frequently confront. To find important information in the text, the model first extracts features from the text using a feature weighting approach based on word spacing and inter-class contribution. This work then presents a filtering technique that tries to enhance the training quality and relevance of word vectors in order to address the issue of irrelevant words that may be introduced by the GloVe model in word vector training. This work effectively builds a weighted word vector model that can precisely capture the value of feature words and rich semantic information by combining the feature weighting technique with irrelevant word screening. According to experimental results, the model performs better in numerous text classification assignments when compared to existing models, demonstrating its efficacy in enhancing text representation performance. The paper enriches the field of text representation by offering a fresh approach and aiding in the advancement ofNatural Language Processing technology. ©2024 IEEE.

关键词： Semantics

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Robust and flexible 3D integrated FeNi@NHCFs air electrode for high-performance rechargeable zinc-air battery

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Rare Metals 2024年第11期43卷 5677-5689页

作者： Lei-Chao Meng Hao Zhang Le Kang Yi Zhang Neng-Fei Yu Fan Zhang Hui-Ling Du Qinghai Provincial Key Laboratory of Nanomaterials and Technology Qinghai Minzu UniversityXi'ning 810007China College of Materials Science and Engineering Xi'an University of Science and TechnologyXi'an 710054China School of Energy Sciences and Engineering Nanjing Tech UniversityNanjing 211816China School of Materials Science and Engineering East China Jiaotong UniversityNanchang 330013China

Designing bifunctional oxygen reduction/evolution(ORR/OER)catalysts with high activity,robust stability and low cost is the key to accelerating the commercialization of rechargeable zinc-air battery(RZAB).Here,we propose a template-assisted electrospinning strategy to in situ fabricate 3D fibers consisting of FeNi nanoparticles embedded into N-doped hollow porous carbon nanospheres(FeNi@NHCFs)as the stable binder-free integrated air cathode in RZAB.3D interconnected conductive fiber networks provide fast electron transfer pathways and strengthen the mechanical ***,N-doped hollow porous carbon nanospheres not only evenly confine FeNi nanoparticles to provide sufficient catalytic active sites,but also endow optimum mass transfer environment to reduce diffusion *** RZABs assembled by FeNi@NHCFs as integrated air cathodes exhibit outstanding battery performance with high open-circuit voltage,large discharge specific capacity and power density,durable cyclic stability and great ***,this work brings a useful strategy to fabricate the integrated electrodes without using any polymeric binders for metal air batteries and other related fields.

关键词： Integrated electrode Oxygen reduction reaction Oxygen evolution reaction Rechargeable zinc-air battery

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The Mechanism and Effect of Seismic Source Location Using Double Waves in Three-Dimensional Microseismic Monitoring

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Journal of engineering science and technology Review 2024年第4期17卷 220-227页

作者： Wang, Zhigang Wang, xiaoqing Yin, Shunlin Ge, Maochen College of Energy Engineering Xi’an University of Science and Technology Shaanxi Xi’an710054 China Department of Mining Engineering Missouri University of Science and Technology RollaMO65409 United States

Accurate seismic source location has always been the most important purpose of microseismic and seismic monitoring. The location accuracy inside the existing monitoring networks is generally high, whereas the accuracy in the external area and sensor accessories area tends to be low. This scenario contributes to an overall limitation in the effective monitoring area. The seismic source location was performed in this study using P waves and S waves to improve the location accuracy outside the monitoring networks and in the adjacent area and enlarge the high-accuracy control area of the monitoring networks. Moreover, the mechanism of seismic source location was theoretically deduced and clarified utilizing P-S double waves. Then, the location accuracy using the P wave and that using the double waves in three typical three-dimensional monitoring networks was analyzed via numerical simulation. Results demonstrate that, in three-dimensional space, using double waves increase the accuracy control in the radius direction of a monitoring network. With the addition of the S wave, the vertical location error is reduced substantially. The microseismic events in a certain range outside the monitoring networks can also be positioned at high accuracy. The area for precise monitoring has been expanded, and the stability of location results has been improved. This research establishes a basis for the advancement of microseismic monitoring technology, aimed at achieving precise and reliable localization in underground engineering applications. © 2024 School of science, DUTH. All rights reserved.

关键词： Microseismic monitoring

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