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International Conference on Information and Computing science, ICIC

作者： Shanshan Wan Ying Hao Cheng Lv School of Computer Science Beijing University of Civil Engineering and Architecture Beijing China

Model to minimize the objective function of the annual reduced cost with the constraints of hydraulic conditions in annular pipe water supply engineering is given in this paper and the genetic algorithm is applied to the actual question. The quick velocity update strategy of particle swarm optimization algorithm is used to modify the GApsilas evolutionary strategy. The advanced algorithm is tested on engineering projects and compared with basic GA. The good adaptability, validity and stability performance are fully shown by the result.

关键词： Biological cells Cost function Genetic mutations computer science civil engineering computer architecture Particle swarm optimization Iterative algorithms Testing Design optimization

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Notice of Violation of IEEE Publication Principles: Performance evaluation of the burstiness impact with a realistic IP structure model

Notice of Violation of IEEE Publication Principles: Performa...

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International Conference on computer science and Information Technology (CSIT)

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

Notice of Violation of IEEE Publication Principles "Performance Evaluation of the Burstiness Impact with a Realistic IP Structure Model" by Hong Fei, Liu Rui, Bai Yu. In the Proceedings of the 2nd IEEE International Conference on computer science and Information Technology, beijing, China, August 2009 After careful and considered review of the content and authorship of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE's Publication Principles. This paper contains significant portions of original text from the paper cited below. The original text was copied without attribution (including appropriate references to the original author(s) and/or paper title) and without permission. Due to the nature of this violation, reasonable effort should be made to remove all past references to this paper, and future references should be made to the following article: "Using LiTGen, a Realistic IP Traffic Model, to Evaluate the Impact of Burstiness on Performance" by C. Rolland, J. Ridoux, B. Baynat, V. Borrel, in the Proceedings of Simutools 2008, Marseille, France, March 3-7, 2008 For practical reasons, network simulators have to be designed on traffic models as realistic as possible. This paper presents the evaluation of a realistic IP structure model that accurately captures the packet on interactions of a range of applications. Through automatically extracted distributions of user, application, and network behavior, it then generates live traffic corresponding to the underlying structure models in a network simulation environment running commodity network protocol stacks. We compare them against real data traces using two methods of evaluation. With a wavelet spectrum analysis, we highlight the intrinsic characteristics of the traffic and show this model's ability to generate traffic traces statistically similar to the original traffic. Then, a performance analysis based on simulations presents the impact of these character

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Analysis and Characteristic at the Chat Session Level in Instant Message Traffic

Analysis and Characteristic at the Chat Session Level in Ins...

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International Conference on Information science and engineering (ICISE)

作者： Fei Hong Rui Liu Liting Hu Yu Bai School of Computer Science and Engineering Beihang University Beijing China School of Science Beijing University of Civil Engineering and Architecture Beijing China

Instant messaging (IM) has become increasingly popular due to its social functionality. Despite its popularity and large user base, little has been done to the analysis and characteristic of the IM traffic, especially at the chat session level. In this paper, we analyze the traffic of two popular instant messaging systems, Yahoo messenger and MSN/Windows Live Messenger. We mainly consider the distribution of chat session level traffic between end users, and find the distribution in many cases follows a power law, as shown in recent work. This power law finding was previously used to support the hypothesis that chat interval time has a power law tail. We further show the scale property by V-T plot and R/S estimation. That is, the interval time is characterized by a strong self-similarity for larger time scales. And the packet arrival times are independent explaining the weak correlation of the data. Our analysis sheds light on instant messaging system design and optimization and provides a scientific basis for instant messaging traffic generation.

关键词： Telecommunication traffic System analysis and design Design optimization Social network services Protocols Information science Information analysis computer science Tail Data analysis

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Modeling Social Cascade in the Flickr Social Network

Modeling Social Cascade in the Flickr Social Network

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International Conference on Fuzzy Systems and Knowledge Discovery (FSKD)

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

We investigate social cascades, or how information propagation through social links in the online social networks. Based on the analysis of one of the largest available datasets collected from Flickr social network in detail, we shed light on the propagation pattern and cascade characteristic of the photos over the Flickr social network, We also apply a simple conceptual model that mimics the spread and dissemination of information on the Flickr social network, and produces information cascades very similar to those found in real network. With a single threshold parameter, this model can predict whether a photo will flourish or flounder in the network. Some interesting findings of the social linking and information propagation structure are also reported in this paper.

关键词： Social network services Data mining Numerical models Data models Joining processes Internet Conferences

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Research of Multi-Constrained Multicast Routing Qos Using Heuristic Algorithm

Research of Multi-Constrained Multicast Routing Qos Using He...

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International Conference on Information engineering and computer science (ICIECS)

作者： Shanshan Wan Yu Zhang School of Computer Science and Network Beijing University of Civil Engineering and Architecture Beijing China

Multicast is widely applied for multimedia communications in Internet. The effective multicast routing is the key technology to the communications. The Qos of multi-constrained multicast routing problem deserves more attention. The objective function is to minimize the cost and meet multiple constraints to realize high Qos. The solutions' fitness is obtained by the concentration mechanism of immune algorithm and the affinity is helpful to the probability update strategy. The node linkage which belongs to the excellent solution has greater probability to be chosen. During the evolutionary process of the algorithm the constraint equation is dynamic adjusted to avoid unnecessary search and shorten the search time. Each invalid path is recorded into the Tabu table as a constraint to guide the next iteration. The heuristic Immune-PBIL algorithm is tested on a network topology and some multicast routing demand is considered. The result also shows that the advanced evolutionary strategies according to the Qos are high efficient and the global search capability is improved.

关键词： Routing Heuristic algorithms Multicast algorithms Multimedia communication Internet Communications technology Cost function Couplings Equations Testing

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Computational Modeling of Complex Systems:Case Study in Real World

Computational Modeling of Complex Systems:Case Study in Real...

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2009 Ninth International Conference on Hybrid Intelligent Systems(第九届混合智能系统国际会议 HIS 2009)

作者： Chunxiao Zhao Lijun Wang Department of Computer Beijing University of Civil Engineering and Architecture BeijingChina School of Information Science & Engineering Bohai University Jinzhou China

The complex systems and complexity is the kernel scientific problem of the 21st century. In this paper, the complex system simulation methods and its application are discussed. The computational agent-based model and simulation methodology for complex systems is approved in the paper. First, the related works and some application fields are introduced. Second, several modeling methods are discussed. Third, several case study are introduced. Then, the formal specification basedcomputational agent for complex systems is proposed. Finally, the modeling and simulation framework is proposed and a simulation platform based on the agent’s is introduced.

关键词： Complex Systems Self-organization Autonomous entities Multi-agent systems NetLogo

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Research on Searching Mechanism Based on Interest in Kademlia

Research on Searching Mechanism Based on Interest in Kademli...

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2009 Ninth International Conference on Hybrid Intelligent Systems(第九届混合智能系统国际会议 HIS 2009)

作者： Chunxiao Zhao He Zhang Department of Computer Beijing University of Civil Engineering and Architecture BeijingChina School of Information Science & Engineering Bohai University Jinzhou China

Kademlia protocol has been studied carefully in this paper. The Kademlia mechanism based on interest is proposed to support approximate search. The interest eigenvector is used to represent the peer's interest. Moreover the interest router table that stores the peers' interest information replaces the original one. Especially as a part of the interest router table, each K-bucket stores a certain number of the peers' information that have high interest similarity. The query can be executed in the appropriate kbucket by calculating interest similarity and interest keyword. Through mining the latent interest, we found that two peers having high interest similarity are more possible to store the similar resource. Because the character restricts the query to a certain scope, the approximate search is realized and search efficiency is improved. The experiments show that the improved search mechanism obviously increases the recall, at the same time effectively reduces the number of visited peers.

关键词： search mechanism interest similarity Kademlia p2p

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Application to Vehicle Routing Optimization Problem Using Information System Based on Intelligent Optimization Algorithm

Application to Vehicle Routing Optimization Problem Using In...

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International Conference on Information Technology and computer science, ITCS

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

Information system based on intelligent optimization algorithm is provided in this paper to solve the vehicle routing optimization problem with time constraint. And a hybrid optimization algorithm-PBIL combined with Ant algorithm is proposed and applied to VRP. The objective function is to minimize the cost and reduce the loss caused by customerspsila time restriction. The probability matrix of PBIL algorithm is modified with the positive feedback and information disappearing mechanisms of Ant algorithm. Also, the probability statistics for the road traffic status distributed is considered in decision-making for the vehiclespsila routing. All the demands of customers are taken as the main constraints in this information system. And the optimal scheme is obtained by t he hybrid intelligent evolutionary algorithm. The actual case is used to test the algorithm and system. The result is excited.

关键词： Routing Information systems Intelligent systems Intelligent vehicles Hybrid intelligent systems Constraint optimization Probability Time factors Cost function Feedback

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An exploration algorithm for a swarm of homogeneous robots

An exploration algorithm for a swarm of homogeneous robots

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2009 International Conference on Computational Intelligence and Software engineering, CiSE 2009

作者： Zhao, Pengchong Liang, Alei Liu, Liang Chen, Ying Guan, Haibing Yan, Xinan School of Software Shanghai Jiao Tong Univ. Shanghai China IBM China Lab. International Business Machines Beijing China Department of Computer Science and Engineering Shanghai Jiao Tong Univ. Shanghai China

ISBN: (纸本)9781424445073

We describe a distributed algorithm for coordinating a swarm of homogeneous robots to explore an unknown area using only local interaction. The basic movement rule is based on the gas dispersion model. To avoid duplication exploring, we introduce a new strategy called SMARK to leave signpost in explored area. Consequently this system have three outstanding features: 1) The swarm of robots coordinate to adapt themselves to different environments;2) The process is independent to the number of robots and can automatically adapt to the influx and death of robots;3) Only local communication is used, ensuring a low communication traffic. Our experiments were conducted in *** compare different robot group size with up to 70 robots, and evaluate the performance to two forms of *** result shows in both environments, the increase of group size will evidently improve system efficiency, and the SMARK plays a more important role in the environment with more obstacles. ©2009 IEEE.

关键词： Swarm intelligence

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Deformation analysis of prestressed continuous steel-concrete composite beams

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Journal of Structural engineering 2009年第11期135卷 1377-1389页

作者： Nie, Jianguo Tao, Muxuan Cai, C.S. Li, Shaojing Dept. of Civil Engineering Tsinghua Univ. Vibration of China Education Ministry Beijing 100084 China Changsha Univ. of Science and Technology Dept. of Civil and Environmental Engineering Louisiana State Univ. Baton Rouge LA 70803 United States School of Civil Engineering and Architecture Changsha China

Deformation calculation of prestressed continuous steel-concrete composite beams accounting for the slip effect between the steel and concrete interface under service loads is analyzed. A simplified analytical model is presented. Based on this model, formulas for predicting the cracking region of concrete slab near the interior supports and the increase of the prestressing tendon force are derived. A table for calculating the midspan deflection of two-span prestressed continuous composite beams is also proposed. It is found that the internal force of the prestressing tendon under service loads can be accurately calculated using the proposed formulas. By ignoring the increase of the tendon force, the calculated deflection are overestimated, and considering the increase of the tendon force can significantly improve the accuracy of analytical predictions. As the calculated values show good agreement with the test results, the proposed formulas can be reliably applied to the deformation analysis of prestressed continuous composite beams. Finally, based on the formulas for calculating the deformation of two-span prestressed continuous composite beams, a general method for deformation analysis of prestressed continuous composite beams is proposed. © 2009 ASCE.

关键词： Deformation

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