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International Symposium on Information science and engineering, ISISE

作者： Hong Fei Bai Yu School of Computer Science and Engineering BeiHang University Beijing China School of Science Beijing University of Civil Engineering and Architecture Beijing China

Performance predictions from wireless networking laboratory experiments seem to dismatch what is really deployed. To generate realistic traffic is one of the major factors hampering researcherspsila ability to make reliable forecasts. This paper reports on the results of a multiscale analysis of traffic traces captured at an infrastructure 802.11g wireless network. The analyzed traffic is characterized by a non self-similar process for small time scales and strong self-similarity for larger time scales. For smaller time scales, the packet arrival times are independent explaining the weak correlation of the data. For larger timescales the arrival of TCP connections can be considered independent. Additionally, we propose a model which allows generating traffic similar to the measured traffic. The model contains only multiscale index allowing influencing all observed changes in LD and variance-time plots. Comparing the output of the model with the real traffic traces we find that the model matches reality accurately.

关键词： Traffic control Telecommunication traffic Communication system traffic control Performance analysis Fractals Electronic mail Wireless networks Information science Information analysis computer science

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Performance Impact of Wireless Mesh Networks with Mining Traffic Patterns

Performance Impact of Wireless Mesh Networks with Mining Tra...

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International Conference on Fuzzy Systems and Knowledge Discovery (FSKD)

作者： Bai Yu Hong Fei School of Sciences Beijing University of Civil Engineering and Architecture Beijing China School of Computer Science and Engineering BeiHang University Beijing China

With mining traffic patterns, we evaluate the performance impact on wireless mesh networks. Genuine traffic traces are collected from the wireless mesh networks testbed, which tends to exhibit long-range dependent behavior under several Hurst index estimators. We analyze traffic traces and use clustering techniques to characterize patterns of individual users' behavior. After extracting traffic data from the raw data logs, we identify session clusters by employing the AutoClass tool and the K-means algorithm. Modeling and simulation were performed using the NS-2 tool. Based on the identified session clusters, we introduce source model based on wavelet. Simulation results indicate that traffic traces, compared to traditional traffic models, predict longer queues and, thus, require larger buffers in the network dimensioning.

关键词： Wireless mesh networks Telecommunication traffic Traffic control Clustering algorithms Internet Computational modeling Predictive models Costs Statistical analysis Switching circuits

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Design method study of hybrid control of passive tuned mass damper in combination with viscoelastic damper based on model of recurrent neural network with bias unit

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Xi'an Jianzhu Keji Daxue Xuebao/Journal of Xi'an univ.rsity of architecture and Technology 2008年第1期40卷 13-17页

作者： Zhou, Jian-Zhong Zhao, Hong-Tie Yang, Run-Lin Chen, Ai-Guo Xue, Jian-Yang College of Soil and Water Conservation Beijing Forestry University Beijing 100083 China School of Civil Eng. Xi'an Univ. of Arch. and Tech. Xi'an 710055 China Department of Civil Engineering Civil and Environment Engineering School University of Science and Technology Beijing Beijing 100083 China School of Civil Engineering and Architecture Beijing Jiaotong University Beijing 100044 China

Based on the hybrid control theory of aseismatic structure and the neural-fuzzy control theory, fuzzy motion differential equations are established for hybrid control system of the passive tuned mass damper (PTMD) in combination with viscoelastic damper based on model of recurrent neural network with bias (RNNWBU), and their solutions are acquired. Two phase design method and its designing step and flow chart of design are put forward for the hybrid control system. A MATLAB program is developed to conduct elastoplastic time history analysis of the hybrid control system. It is indicated that the analysis result fits very well with the test result. Therefore the two-phases design method has come true of the hybrid control system of the passive tuned mass damper in combination with viscoelastic damper based on model of recurrent neural network with bias. This paper has made further development on the aseismatic design method of hybrid control of seismic reduction structure and played an important role in promoting the development of the theory of structural control, and therefore has a widely developing prospect.

关键词： Hybrid control Passive tuned mass damper Two phases design method Viscoelastic damper

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Vehicle Routing Optimization Problem with Time Constraint Using Advanced PBIL Algorithm

Vehicle Routing Optimization Problem with Time Constraint Us...

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2008 IEEE International Conference on Service Operations and Logistics, and Informatics(IEEE/SOLI’2008)(IEEE服务运作、物流与信息年会)

作者： Shanshan Wan Dongwei Qiu School of Computer Science Beijing University of Civil Engineering and ArchitectureBeijing China School of Geomatics and Urban Information Beijing University of Civil Engineering and Architecture B

The intelligent optimization algorithm PBIL is applied to *** to the concrete problem that the objective function is to minimize the cost and meet the time *** the probability statistics for the road traffic status distributed in working hours is considered to decide the *** probability matrix of PBIL algorithm is modified with the quick velocity update strategy of particle swarm optimization *** modified PBIL algorithm is tested in a beijing Stone Logistics *** good adaptability,validity and stability performance are fully shown by the results.

关键词： PBIL PSO VRP time restriction probability statistics

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Study on campus wireless mobile model based on AOC modeling

Study on campus wireless mobile model based on AOC modeling

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IET 2nd International Conference on Wireless, Mobile and Multimedia Networks (ICWMMN 2008)

作者： Chun-xiao Zhao Ning Ding Lu Gao Li-jun Wang Department of Computer Beijing University of Civil Engineering and Architecture China School of Computer Science and Engineering University of Science and Technology Liaoning Anshan 114051 China School of Information Science and Engineering Bohai University Jinzhou 121000 China

With regard to the fundamental problem of the MANET routing protocols, this paper according to the campus mobile node behaviour, aims to establish a campus wireless mobile model based on AOC system. Through NS-2 simulation platform extensive simulate result and analysis of different mobile fashion which effect on the MANET routing protocol performance: in the aspect of Packet Delivery Ratio,DSR and AODV both surpass 95%, were not greatly affected by the changes of node mobile rate; DSDV and DSR closed to the Path Optimality.

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Chaos feature of microseismic

Chaos feature of microseismic

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Zhi-min Li Xian-tai Gou Qiang Chen Zhen Liu Wei-dong Jin Bao-long Zhu School of Material Science and Engineering Southwest Jiaotong University Chengdu 610031 China School of Electrical Engineering Southwest Jiaotong University Chengdu 610031 China School of Civil Engineering Southwest Jiaotong University Chengdu 610031 China School of Computer Science Beijing University of Posts and Telecommunications 100876 China School of Civil Engineering and Architecture Southwest University of Science and Technology Mianyang 621010 China

Microseismic is applied broadly but intra-pulse features of microseismic are not studied enough still. For exploring the chaos features of microseismic, the largest Lyapunov exponents and correlation dimension of pulse segment of four microseismic records are calculated. All the largest Lyapunov exponents of pulse segment of four microseismic records are greater than zero, and all their non-zero attractor of correlation dimension exists. The results show that microseismic is of chaos.

关键词： Correlation Chaos Trajectory Time series analysis Mathematical model Time-frequency analysis Delay effects

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High Efficient Intrusion Detection Methodology with Twin Support Vector Machines

High Efficient Intrusion Detection Methodology with Twin Sup...

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International Symposium on Information science and engineering, ISISE

作者： Xuejun Ding Guiling Zhang Yongzhen Ke Baolin Ma Zhichao Li Department of Computer Science Hebei Institute of Architecture and Civil Engineering Zhangjiakou China Department of Computer Science Tianjin Professional University Tianjin China Department of software North Microelectronics Corporation Beijing China Department of Information Management China Central Party School Beijing China

Intrusion detection has become the important component of the network security. Many intelligent intrusion detection models are proposed, but the performance and efficiency are not satisfied to real computer network system. This paper extends these works by applying a new high efficient technique, named twin support vector machines (TWSVM), to intrusion detection. Using the KDD'99 data set collected at MITpsilas Lincoln Labs evaluates the performance and efficiency of the proposed intrusion detection models. The experimental results indicate that the proposed models based on TWSVM is more efficient and has higher detection rate than conventional SVM based model and other models.

关键词： Intrusion detection Support vector machines Data mining Information security Data security computer science Machine intelligence Artificial neural networks Fuzzy systems Clustering algorithms

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Virtual reality mobility model for wireless ad hoc networks

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Journal of Systems engineering and Electronics 2008年第4期000卷

作者： Yu Ziyue Gong Bo He Xingui Yu Ziyue (School of Computer Science & Engineering Beijing Univ.of Aeronautics and AstronauticsBeijing 100083P.R.China) Gong Bo ( School of Computer Science & Engineering Beijing Univ.of Aeronautics and AstronauticsBeijing 100083P.R.ChinaInst.of Command and Technology of EquipmentBeijing 101416P.R.China) He Xingui (School of Electronics Engineering and Computer Science Peking Univ.Beijing 100871P.R.China)

For wireless ad hoc networks ***''s mobility pattern and traffic pattern are two key elements.A new simulation model is presented based on the virtual reality collision detection algorithm in obstacle environment,and the model uses the path planning method to avoid obstacles and to compute the node''s moving *** also affect node''s signal *** these factors,this study implements the mobility model for wireless ad hoc *** results show that the model has a significant impact on the performance of protocols.

关键词： wireless ad hoc networks computer simulation network protocols mobility models

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PrDLs: A new kind of probabilistic description logics about belief

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20th International Conference on Industrial, engineering, and Other Applications of Applied Intelligent Systems, lEA/AlE-2007

作者： Tao, Jia Wen, Zhao Hanpin, Wang Lifu, Wang School of Electronics Engineering and Computer Science Peking Univ. Beijing 100871 China

ISBN: (纸本)9783540733225

It is generally accepted that knowledge based systems would be smarter if they can deal with uncertainty. Some research has been done to extend Description Logics(DLs) towards the management of uncertainty, most of which concerned the statistical information such as "The probability that a randomly chosen bird flies is greater than 0.9". In this paper, we present a new kind of extended DLs to describe degrees of belief such as "The probability that all plastic objects float is 0.3". We also introduce the extended tableau algorithm for PrALC as an example to compute the probability of the implicit knowledge. © Springer-Verlag Berlin Heidelberg 2007.

关键词： Logic programming

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Performance Evaluation of Wireless Mesh Networks with Self-Similar Traffic

Performance Evaluation of Wireless Mesh Networks with Self-S...

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第三届IEEE无线通讯、网络技术暨移动计算国际会议

作者： Hong Fei Bai Yu School of Computer Science and Engineering BeiHang University Beijing China Department of Basic Sciences Beijing University of Civil Engineering and Architecture Beijing China

In this paper we evaluate the performance impact of traffic patterns on wireless mesh networks. Modeling and simulation of the wireless mesh networks were performed using the NS-2 tool. Trace-driven simulations with genuine traffic trace collected from the wireless mesh networks are used to evaluate the performance. This trace tends to exhibit long-range dependent behavior. Simulation results indicate that genuine traffic traces, compared to traditional traffic models such as the Poisson model, produce longer queues and, thus, require larger buffers in the deployed networks' elements.

关键词： Wireless mesh network Performance Self-Similar

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