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Clustering routing algorithm of wireless sensor networks based on Bayesian game

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Journal of Systems Engineering and Electronics 2012年第1期23卷 154-159页

作者： Gengzhong Zheng sanyang liu xiaogang qi School of Computer Science and Technology Xidian University Xi＇an 710071 R R. China Department of Mathematics and Information Technology Hanshan Normal University Chaozhou 521041 R R. China School of Science Xidian University Xi＇an 710071 R R. China

To avoid uneven energy consuming in wireless sen- sor networks, a clustering routing model is proposed based on a Bayesian game. In the model, Harsanyi transformation is introduced to convert a static game of incomplete information to the static game of complete but imperfect information. In addition, the existence of Bayesian nash equilibrium is proved. A clustering routing algorithm is also designed according to the proposed model, both cluster head distribution and residual energy are considered in the design of the algorithm. Simulation results show that the algorithm can balance network load, save energy and prolong network lifetime effectively.

关键词： wireless sensor networks (WSNs) clustering routing Bayesian game energy efficiency.

Fault diagnosis based on dial-test data in datacenter networks

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Journal of Systems Engineering and Electronics 2019年第5期30卷 1035-1043页

作者： qi xiaogang WANG Bingchun liu lifang School of Mathematics and Statistics Xidian UniversityXi’an 710071China School of Computer Science and Technology Xidian UniversityXi’an 710071China Xidian-Ningbo Information Technology Institute Ningbo 315200China

The fast growth of datacenter networks,in terms of both scale and structural complexity,has led to an increase of network failure and hence brings new challenges to network management *** network failure such as node failure is inevitable,how to find fault detection and diagnosis approaches that can effectively restore the network communication function and reduce the loss due to failure has been recognized as an important research problem in both academia and *** research focuses on exploring issues of node failure,and presents a proactive fault diagnosis algorithm called heuristic breadth-first detection(HBFD),through dynamically searching the spanning tree,analyzing the dial-test data and choosing a reasonable threshold to locate fault *** theoretical analysis and simulation results demonstrate that HBFD can diagnose node failures effectively,and take a smaller number of detection and a lower false rate without sacrificing accuracy.

关键词： datacenter network node failure proactive fault diagnosis

SEM-Based Method for Performance Evaluation of Wired LANs

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Transactions of Nanjing University of Aeronautics and Astronautics 2018年第3期35卷 403-412页

作者： qi xiaogang Xu Chunxia liu lifang School of Mathematics and Statistics Xidian UniversityXi＇anShaanxi 710071P.R.China School of Computer Science and Technology Xidian UniversityXi＇anShaanxi 710071P.R.China

For wired local area networks(LANs),their effectiveness and invulnerability are very *** is extraordinarily significant to evaluate the network performance effectively in the design of a reasonable network topology and the performance improvement of the ***,there are many factors affecting the performance of the networks,and the relation among them is also *** to evaluate the performance of the wired LANs more accurately has been a heavy challenge in the network *** order to solve the problem,this paper presents a performance evaluation method that evaluates the effectiveness and invulnerability of the wired *** to traditional statistical methods,it has the distinct advantage of being able to handle several dependent variables simultaneously and tolerates the measurement errors among these independent variables and dependent ***,the rationality and validity of this method are verified by the extensive experimental simulation.

关键词： wired local area networks(LANs) structural equation model(SEM) node contribution performance prediction network topology

Research on performance of complex networks based on principal component analysis

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The Journal of China Universities of Posts and Telecommunications 2019年第1期26卷 40-48页

作者： Xu Chunxia qi xiaogang liu lifang School of Mathematics and Statistics Xidian University School of Computer Science and Technology Xidian University

For complex networks, their effectiveness and invulnerability are extremely important. With the development of complex networks, how to evaluate the effectiveness and invulnerability of these networks becomes an important research topic. The relationship among many influencing factors is very complicated, so it is essential to confirm the weighting coefficient of these influencing factors. Principal component analysis(PCA) is proposed to evaluate the performance of complex networks. It can improve one-sidedness of the single evaluation index and select different evaluation models according to different complex networks, which make the evaluation result more accurate. Performance of complex networks can be predicted according to comprehensive evaluation model. To verify the rationality and validity of this method, several small-world networks with different probability values and scale-free network are chosen to evaluate the network performance. Finally, simulation results show that PCA can be applied to performance evaluation of complex networks.

关键词： complex networks network topology principal component analysis performance prediction

ROUTING AND WAVELENGTH ASSIGNMENT ALGORITHMS BASED ON EQUIVALENT NETWORKS

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Journal of Electronics(China) 2006年第5期23卷 723-730页

作者： qi xiaogang liu lifang liu sanyang Department of Mathematics Science Xidian University Xi ＇an 7100 71 China School of Computer Science ＆ Technology Xidian University Xi＇an 710071 China

In this paper, a Wavelength Division Multiplexing (WDM) network model based on the equivalent networks is described, and wavelength-dependent equivalent arc, equivalent networks, equivalent multicast tree and some other terms are presented. Based on this model and relevant Routing and Wavelength Assign- ment (RWA) strategy, a unicast RWA algorithm and a multicast RWA algorithm are presented. The wave- length-dependent equivalent arc expresses the schedule of local RWA and the equivalent network expresses the whole topology of WDM optical networks, so the two algorithms are of the flexibility in RWA and the optimi- zation of the whole problem. The theoretic analysis and simulation results show the two algorithms are of the stronger capability and the lower complexity than the other existing algorithms for RWA problem, and the complexity of the two algorithms are only related to the scale of the equivalent networks. Finally, we prove the two algorithms’ feasibility and the one-by-one corresponding relation between the equivalent multicast tree and original multicast tree, and point out the superiorities and drawbacks of the two algorithms respectively.

关键词： Wavelength Division Multiplexing (WDM) optical networks Wavelength-dependent equivalent arc Equivalent network Equivalent multicast tree Routing and Wavelength Assignment (RWA)

Multifractal analysis of the software evolution in software networks

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Chinese Physics B 2022年第3期31卷 208-215页

作者： Meili liu xiaogang qi Hao Pan School of Mathematics and Statistics Xidian UniversityXi'an 0710071China

As the scale and complexity have been increased in software systems, developers place more emphases on software engineering and system designs. Software architecture is evolved with update of softwares, and it plays a fundamental role in determining quality of software systems. Multifractal characteristics of software networks can reflect software quality. In this paper, we construct a software network from the dependencies between object classes, and gain a deep understanding of software through network analysis. To be specific, multifractal analysis of the software network is performed based on a modified box-covering algorithm that yields fewer boxes. We verify that software with different functions and dependencies is multifractal. Further, different versions of the software are compared to discover the evolution of the software architecture. The results show that the singularity of class dependencies decreases as the software is updated. This trend leads to a more specific division of functions between software modules. One of the visible advantages of our work is that it allows the characterization of software structures at the code level. The methodology and results of this paper provide new insights into the evaluation and design of large-scale software systems.

关键词： software multifractal box-covering algorithm

A UWB/IMU-Assisted Fingerprinting Localization Framework with Low Human Efforts

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China Communications 2024年第6期21卷 40-52页

作者： Pan Hao Chen Yu qi xiaogang liu Meili School of Mathematics and Statistics Xidian UniversityXi’an 710126China Science and Technology on Near-Surface Detection Laboratory Wuxi 214035China School of Software Nanchang Hangkong UniversityNanchang 330063China

With the rapid development of smart phone,the location-based services(LBS)have received great attention in the past *** to the widespread use of WiFi and Bluetooth devices,Received Signal Strength Indication(RSSI)fingerprintbased localization method has obtained much development in both academia and *** this work,we introduce an efficient way to reduce the labor-intensive site survey process,which uses an UWB/IMU-assisted fingerprint construction(UAFC)and localization framework based on the principle of Automatic radio map generation scheme(ARMGS)is proposed to replace the traditional manual *** be specific,UWB devices are employed to estimate the coordinates when the collector is moved in a reference point(RP).An anchor self-localization method is investigated to further reduce manual measurement work in a wide and complex environment,which is also a grueling,time-consuming process that is lead to artificial ***,the measurements of IMU are incorporated into the UWB localization algorithm and improve the label accuracy in *** addition,the weighted k-nearest neighbor(WKNN)algorithm is applied to online localization ***,filed experiments are carried out and the results confirm the effectiveness of the proposed approach.

关键词： indoor localization machine learning ultra wideband WiFi fingerprint

Scenario Modeling-Aided AP Placement Optimization Method for Indoor Localization and Network Access

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China Communications 2024年第3期21卷 37-50页

Owing to the ubiquity of wireless networks and the popularity of WiFi infrastructures,received signal strength(RSS)-based indoor localization systems have received much *** placement of access points(APs)significantly influences localization accuracy and network ***,the indoor scenario and network access are not fully considered in previous AP placement optimization *** study proposes a practical scenario modelingaided AP placement optimization method for improving localization accuracy and network *** order to reduce the gap between simulation-based and field measurement-based AP placement optimization methods,we introduce an indoor scenario modeling and Gaussian process-based RSS prediction *** that,the localization and network access metrics are implemented in the multiple objective particle swarm optimization(MOPSO)solution,Pareto front criterion and virtual repulsion force are applied to determine the optimal AP ***,field experiments demonstrate the effectiveness of the proposed indoor scenario modeling method and RSS prediction model.A thorough comparison confirms the localization and network access improvement attributed to the proposed anchor placement method.

关键词： indoor localization MOPSO network access RSS prediction

A solvent-free process enabling ZnO/porous carbon with enhanced microwave absorption

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Journal of Materials Science & Technology 2023年第18期149卷 255-264页

作者： qi Chen Xing liu Tingting Wang xiaogang Su Meng liu Somboon Chaemchuen Francis Verpoort State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China School of Mathematical&Physical Sciences Wuhan Textile UniversityWuhan 430200China National Research Tomsk Polytechnic University Lenin Avenue 30634050 TomskRussian Federation School of Materials Science and Engineering North University of ChinaTaiyuan 030051China

Exploring a simple,rapid,solvent-free synthetic method for mass production of cheap,broadband mi-crowave absorbers remains the main ***,a mild solvent-free procedure is reported to syn-thesize zinc oxide nanoparticles(ZnO NPs)embedded in porous carbon derived from mixing sucrose and zinc nitrate *** characteristic morphology and the ZnO NPs distribution in these compos-ites were tuned using the different raw materials *** mesoporous structure of porous car-bon benefits the compositional advantages between carbon foam and ZnO *** optimal synthesized ZnO/C-2 carbon material demonstrates the strongest absorption of-41.7 dB with a frequency of 14.5 GHz at a thin thickness of 2 mm,and its widest effective absorption is close to 6 GHz(12.2-17.8 GHz).This work produces a feasible route for the sensible design of other effective microwave absorbers for large-scale production.

关键词： Solvent-free method Porous carbon Dielectric materials Interfacial polarization Microwave broadband absorption