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International Conference on Multimedia Information Networking and Security (MINES)

作者： Xing Su Songhai Mo Hui Wang Xin Zhang The Research Center of Computational Experiments and Parallel System Technology National University of Defense Technology ChangSha P.R. China

In this paper, we propose a novel method based on the combination of Named Entity Recognition and Entity Rank algorithm for detecting key entities with significant influence and importance from huge sentiment data collected from Internet. Firstly, we extract entities from the target news websites and forums using a rule-based and CRF combined method. Secondly, we use the Entity Rank algorithm to calculate the hotness of entities extracted from the news and forums data. Finally, we validate the rationality of our algorithm by comparing our hot entities and current affairs. We believe this work will shed new lights on the online public sentiment supervision.

关键词： Organizations Hidden Markov models Data mining Tagging Couplings Educational institutions Internet

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The Design and Implement of High Efficient Incremental Microblogging Crawler

The Design and Implement of High Efficient Incremental Micro...

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International Conference on Multimedia Information Networking and Security (MINES)

作者： Dayong Shen Hui Wang Jianping Cao Pei Li Zhihong Jiang The Research Center of Computational Experiments and Parallel System Technology National University of Defense Technology ChangSha P.R. China National University of Defense Technology Changsha Hunan CN

ISBN: (纸本)9781467330930

With the rapid development of microblog technology, many interesting research issues on microblog have aroused growing attention. Data fetching from microblog is the groundwork of these researches. In this paper we take Sina microblog (also called Weibo) as the crawling site, designing and implementing a high efficient incremental microblog crawler based on the classic multi-producers and multi-consumers model. Experimental results demonstrate that the crawler can collect real time microblog information efficiently and precisely.

关键词： Crawlers Data mining Bandwidth Schedules Engines USA Councils Security

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Learning control of dynamical systems based on Markov decision processes: research frontiers and outlooks

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Zidonghua Xuebao/Acta Automatica Sinica 2012年第5期38卷 673-687页

作者： Xu, Xin Shen, Dong Gao, Yan-Qing Wang, Kai Institute of Automation College of Mechatronic Engineering and Automation National University of Defense Technology Changsha 410073 China Institute of Automation Chinese Academy of Sciences Beijing 100190 China State Key Laboratory of Management and Control for Complex Systems Beijing 100190 China Department of Systems and Industrial Engineering University of Arizona Tucson AZ85721-0020 United States Center for Military Computational Experiments and Parallel Systems Technology National University of Defense Technology Changsha 410073 China

Learning control of dynamical systems based on Markov decision processes (MDPs) is an interdisciplinary research area of machine learning, control theory, and operations research. The main objective in this research area is to realize data-driven multi-stage optimal control for complex or uncertain dynamical systems. This paper presents a comprehensive survey on the theory, algorithms, and applications of MDP-based learning control of dynamical systems. Emphases are put on recent advances in the theory and methods of reinforcement learning (RL) and adaptive/approximate dynamic programming (ADP), including temporal-difference learning theory, value function approximation for continuous state and action spaces, direct policy search, approximate policy iteration, and adaptive critic designs. Applications and the trends for future research and developments in related fields are also discussed. Copyright © 2012 Acta Automatica Sinica. All rights reserved.

关键词： Markov processes

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IEEE International Conference on Intelligence and Security Informatics

作者： Gao, Chao Zhang, Xin Zheng, Liang Wang, Hui Research Center of Computational Experiments and Parallel System Technology College of Information Systems and Management National University of Defense Technology China

ISBN: (纸本)9781457700828

Social multimedia content had an unprecedented increasing trend in recent years, and receiving a number of research attentions. Images, an exceedingly expressive form of social multimedia, can be widely seen in news report for social emergency. Among the vast number of images for social emergency are many repurposed images, that is, variants not interpreted as what the original images express. Such repurposed images appear in many online pages and may mislead the public. This make it being an interesting and challenging task to identify whether an image is repurposed. We propose a novel framework, called SOFC, to identify the repurposed images. A SIFT-based identical parts finding algorithm is used to find and align all potential identical blocks in the repurposed images and the original images. We then compute the similarity of the potential identical blocks by implementing an object-based likelihood measuring algorithm, to determine whether these blocks are identical in the two images. Finally, the effectiveness of the proposed identification method is validated by experiments on a image set of real social emergency. © 2011 IEEE.

关键词： Bismuth Image resolution Object recognition SIFT based identical parts finding algorithm SOFC feature extraction image similarity multimedia computing multimedia social computing object based likelihood measuring algorithm repurposed images social emergen

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Measurement and analysis of topology and information propagation on Sina-Microblog

Measurement and analysis of topology and information propaga...

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IEEE International Conference on Intelligence and Security Informatics

作者： Fan, Pengyi Li, Pei Jiang, Zhihong Li, Wei Wang, Hui Research Center of Computational Experiments and Parallel System Technology College of Information Systems and Management National University of Defense Technology China

ISBN: (纸本)9781457700828

Sina-Microblog, the earliest and biggest microblogging service in China, has become one of the most popular media in information propagation. In order to gain insights into the topological and information diffusing characteristics of microblogging network in China, we crawled Sina-Microblog for about 3 months and obtain the trace of its topology and topics. Compared with other online social networks, our measurement study shows a number of interesting findings. Our data suggests that Sina-Microblog network has apparent small-world effect and scale-free characteristic, specially, the outdegree distribution appears to have multiple separate power-law regimes with different exponents. We also observe the overlay graph of Sina-Microblog represents assortative mixing pattern and weak correlation of indegree and outdegree. Moreover, by constructing the cascades of different topics, our data suggests that the distribution of cascades size follows a power-law and heavy-tailed property with the slope approximately 2, and the common motifs of cascades with different topics are very similar, above 93% of them are isolated nodes. In order to find the formative motivity of hot cascades, we find that they always evolve to the structures like star pattern and two-polar pattern, which are mainly due to the indegree of participating nodes, and are also correlated with the content of tweet. © 2011 IEEE.

关键词： Topology

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A geographic analysis of P2P-TV viewership

A geographic analysis of P2P-TV viewership

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IEEE International Conference on Intelligence and Security Informatics

作者： Jiang, Zhihong Wang, Hui Zhang, Yubao Li, Pei Research Center of Computational Experiments and Parallel System Technology College of Information Systems and Management National University of Defense Technology China

ISBN: (纸本)9781457700828

A promising P2P application, P2P-TV, has attracted hundreds of thousands of Chinese viewers. These viewers who are located in different regions represent groups with distinct cultures. However, little existing research has provided sufficient insights into the societal impact of P2P-TV systems, from the viewpoint of geographic distribution of viewers. In this paper, we analyze geographic distribution of viewers of three most popular P2P-TV systems simultaneously, PPLive, PPStream and UUSee. With more than 20 GB worth of log data from three different P2P-TV systems, we have completed a thorough investigation of geographic distribution of viewers. We also seek to explore the potential correlation between viewer population density and economic development level and find that there is indeed a highly negative correlation between them. © 2011 IEEE.

关键词： Geographical distribution

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TV monitor: A P2P-TV content monitoring platform

TV monitor: A P2P-TV content monitoring platform

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3rd International Conference on Multimedia Information Networking and Security, MINES 2011

作者： He, Su Zhang, Xing Jiang, Zhihong Kang, Hao Wang, Hui Research Center of Computational Experiments and Parallel System Technology College of Information Systems and Management National University of Defense Technology Changsha China

ISBN: (纸本)9780769545592

As P2P-TV applications are widely used on the Internet, its disadvantages shows up with its conventions, particular the easier spread of erotic, violent or pirated content. To address this problem, this paper presents a system that can accurately identify and closely monitor the P2P-TV traffic passing through a campus network. It consists of five core modules: data collection, traffic identification, active measurement, video content detection and filter, and center of visualization. The basic flow of the content monitoring contains five steps: 1) the data collection module collects mixed traffic from the campus gateway, 2) the traffic identification module classifies the mirrored traffic and identifies the P2P-TV traffic flows of the corresponding platforms and their channels watching by the viewers in the campus network, 3) the active measurement module is driven to probe the behavior, IP addresses and geographical positions of online viewers, 4) the video content detection and filter module recovers the video content from the identified P2P-TV traffic and performs anomaly detection, and 5) the center of visualization module is responsible to interact with other modules and visualizes all results on the web in various manners. © 2011 IEEE.

关键词： Data visualization

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Erratum: Analysis of opinion spreading in homogeneous networks with signed relationships

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Journal of Statistical Mechanics: Theory and Experiment 2012年第10期2012卷

作者： Pengyi Fan Hui Wang Pei Li Wei Li Zhihong Jiang Research Center of Computational Experiments and Parallel System Technology College of Information Systems and Management National University of Defense Technology Changsha 410073 People's Republic of China

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Evaluation of chemical emergency operation considering behavioral effect

Evaluation of chemical emergency operation considering behav...

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2011 IEEE International Conference on Service Operations, Logistics and Informatics, SOLI 2011

作者： Wei, Wei Wen, Ding Cheng, Changjian Beijing 100190 China Academy of Equipment Command and Technology Beijing 102249 China Changsha Hunan China Research Center for Military Computational Experiments and Parallel Systems Technology NUDT 410073 China CASIA Beijing 100190 China

ISBN: (纸本)9781457705731

The effect evaluation of chemical emergency response plans before implementation is an important research topic. Most researchers focus on the evaluation of chemical objective process and ignore the impact of human behaviors on the emergency response process. In order to study the uncertainties of human behaviors, a dynamic evaluation method of emergency response plans based on ACP (Artificial system, computational experiments, parallel Execution) is presented in this paper. A model indicating the logic interactive relationship between chemical equipments and human is constructed by using hierarchical Petri nets. The emergency response reliability of people with different attributes is obtained by conducting computational experiments. And the significant attributes of reliability is analyzed through the orthogonal experimental design. The method provides feasibility for the comprehensive evaluation of chemical emergency response plans. © 2011 IEEE.

关键词： Petri nets

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On delay performance of peer-to-peer networks with age-dependent branching processes

On delay performance of peer-to-peer networks with age-depen...

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3rd International Conference on Multimedia Information Networking and Security, MINES 2011

作者： Xia, Youqing Wang, Hui Zhang, Yubao Li, Pei Research Center of Computational Experiment and Parallel System Technology College of Information Systems and Management National University of Defense Technology China

ISBN: (纸本)9780769545592

In this paper, we extended the Snow Ball algorithm to model Peer-to-Peer (P2P) networks based on the age-dependent branching process. We proved the extended Snow Ball algorithm approached a minimum delay bound in P2P networks. Given a fixed delay T, the maximal population to which a piece of content can be disseminated is derived, based on the age-dependent branching process. Similarly, we also mathematically analyze the minimum delay when the population N is fixed. © 2011 IEEE.

关键词： Snow

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