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Flocking behavior with multiple leaders and global trajectory

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Journal of Central South University 2014年第6期21卷 2324-2333页

作者：李猛梁加红李石磊 College of information System and management National University of Defense Technology Department of information Security College of Electronic EngineeringNaval University of Engineering

Aiming at the group of autonomous agents consisting of multiple leader agents and multiple follower ones,a flocking behavior method with multiple leaders and a global trajectory was *** this flocking method,the group leaders can attain the information of the global trajectory,while each follower can communicate with its neighbors and corresponding leader but does not have global *** to a distributed control method,the proposed method firstly sets a movable imaginary point on the global trajectory to ensure that the center and average velocity of the leader agents satisfy the constraints of the global ***,a two-stage strategy was proposed to make the whole group satisfy the constraints of the global ***,the distance between the center of the group and the desired trajectory was analyzed in detail according to the number ratio of the followers to the *** this way,on one hand,the agents of the group emerge a basic flocking behavior; on the other hand,the center of the group satisfies the constraints of global *** results demonstrate the effectiveness of the proposed method.

关键词： multi-agent system group of agents flocking behavior distributed control global trajectory

A novel multisignature scheme for a special verifier group against clerk and rogue-key attacks

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Journal of Zhejiang University-Science C(Computers and Electronics) 2010年第4期11卷 290-295页

作者： Jia-lun TSAI Tzong-chen WU Kuo-yu TSAI Department of information management National Taiwan University of Science and Technology Taiwan information Security Center National Taiwan University of Science and Technology

The digital signature is a very important subject for network *** multiple signers and multiple verifiers,Xie and Yu(2004) pointed out that the multisignature scheme of Laih and Yen(1996) is vulnerable to a harmful *** attack can occur when a specified group of verifiers cooperate to forge a multisignature by secret key substitution following the leak of a secret key or by group public key adjustment during the process of renewing *** and Yu proposed an improvement of Laih and Yen's multisignature *** this paper,we show that Xie and Yu's scheme is vulnerable to clerk and rogue-key *** propose an improved multisignature scheme to resist such *** the proposed scheme,multiple signers can generate a multisignature for the message with the signers' secret keys,and the specified group of verifiers can cooperate to verify the validity of the multisignature with the signers' public keys and the verifiers' secret *** proposed scheme for a special verifier group not only has the advantages of Xie and Yu's scheme,but also is secure against clerk and rogue-key attacks.

关键词： Multisignature Clerk attack Rogue-key attack Cryptosystem

Application of Component Technology to E-commerce System

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Geo-Spatial information Science 2004年第4期7卷 308-310页

作者： ZHU Jianfeng ZHU Jianfeng, postgraduate, School of information management, Wuhan University, Luojia Hill, Wuhan 430072 Economic information management Department, Hubei Univisity of Economics, 33 Luoyu Road, Wuhan 430079, China. School of information management Wuhan University Economic information management Department Hubei Univisity of Economics

At present E-commerce system tends to become more complex, and traditional system designing methods can not fufil the need of E-commerce system, thus requiring an effective methodas solution. With this concern, this paper introduces some concepts of component technology, then brings forward the new connotation and basic features of component technology through the analysis of its technological character. This paper finally discusses the application of component technology to E-commerce system.

关键词： E-commerce component interface internet

LCH:A local clustering H-index centrality measure for identifying and ranking influential nodes in complex networks

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Chinese Physics B 2021年第8期30卷 566-574页

作者： Gui-Qiong Xu Lei Meng Deng-Qin Tu Ping-Le Yang Department of information management School of ManagementShanghai UniversityShanghai 200444China Business School University of Shanghai for Science and TechnologyShanghai 200093China School of Electrical and information Engineering Jiangsu University of Science and Technology Zhangjiagang 215600China

Identifying influential nodes in complex networks is one of the most significant and challenging issues,which may contribute to optimizing the network structure,controlling the process of epidemic spreading and accelerating information *** node importance ranking measures based on global information are not suitable for large-scale networks due to their high computational ***,they do not take into account the impact of network topology evolution over time,resulting in limitations in some *** on local information of networks,a local clustering H-index(LCH)centrality measure is proposed,which considers neighborhood topology,the quantity and quality of neighbor nodes *** proposed measure only needs the information of first-order and second-order neighbor nodes of networks,thus it has nearly linear time complexity and can be applicable to large-scale *** order to test the proposed measure,we adopt the susceptible-infected-recovered(SIR)and susceptible-infected(SI)models to simulate the spreading process.A series of experimental results on eight real-world networks illustrate that the proposed LCH can identify and rank influential nodes more accurately than several classical and state-of-the-art measures.

关键词： complex networks influential nodes local structure susceptible infected recovered model susceptible infected model

A Bootstrapping-based Method to Automatically Identify Data-usage Statements in Publications

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Journal of Data and information Science 2016年第1期1卷 69-85页

作者： Qiuzi Zhang Qikai Cheng Yong Huang Wei Lu School of information management Wuhan University

Purpose： Our study proposes a bootstrapping-based method to automatically extract data- usage statements from academic texts. Design/methodology/approach： The method for data-usage statements extraction starts with seed entities and iteratively learns patterns and data-usage statements from unlabeled text. In each iteration, new patterns are constructed and added to the pattern list based on their calculated score. Three seed-selection strategies are also proposed in this paper. Findings： The performance of the method is verified by means of experiments on real data collected from computer science journals. The results show that the method can achieve satisfactory performance regarding precision of extraction and extensibility of obtained patterns. Research limitations： While the triple representation of sentences is effective and efficient for extracting data-usage statements, it is unable to handle complex sentences. Additional features that can address complex sentences should thus be explored in the future. Practical implications： Data-usage statements extraction is beneficial for data-repository construction and facilitates research on data-usage tracking, dataset-based scholar search, and dataset evaluation. Originality/value： To the best of our knowledge, this paper is among the first to address the important task of automatically extracting data-usage statements from real data.

关键词： Data-usage statements extraction information extraction Bootstrapping Unsupervised learning Academic text-mining

Predicting Future Rumours

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Chinese Journal of Electronics 2018年第3期27卷 514-520页

作者： QIN Yumeng Dominik Wurzer TANG Cunchen School of Computer Science (International School of Software) Wuhan University School of information management Wuhan University

Recent uproar of fake news and misinformation on social media platforms has sparked the interest in the scientific community to automatically detect and refute them. The most popular research task to counteract misinformation, Rumour detection, requires repeated signals to reach adequate detection accurate. Consequently,rumour detection recognizes rumours only when they have started spreading and causing harm. We introduce a new task called "rumour prediction" that assesses the possibility of a document arriving from a social media stream becoming a rumour in the future. Note that rumour prediction differentiates itself from rumour detection through instant decision making. This allows refuting misinformation before it spreads and causes harm. Our approach to rumour prediction harnesses content based features in combination with novelty based features and pseudo *** experiments show that we are able to accurately predict, whether a document will become a rumour in the future. Additionally, we show how rumour prediction can significantly improve the accuracy of state-of-the-art Rumour detection systems.

关键词： Real-time rumour prediction Social media Data stream information retrieval K-term hashing Pseudo feedback

How Users Search the Mobile Web:A Model for Understanding the Impact of Motivation and Context on Search Behaviors

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Journal of Data and information Science 2016年第1期1卷 98-122页

作者： Dan Wu Man Zhu Aihua Ran School of information management Wuhan University

Purpose： This study explores how search motivation and context influence mobile Web search behaviors. Design/methodology/approach： We studied 30 experienced mobile Web users via questionnaires, semi-structured interviews, and an online diary tool that participants used to record their daily search activities. SQLite Developer was used to extract data from the users＇ phone logs for correlation analysis in Statistical Product and Service Solutions （SPSS）. Findings： One quarter of mobile search sessions were driven by two or more search motivations. It was especially difficult to distinguish curiosity from time killing in particular user reporting. Multi-dimensional contexts and motivations influenced mobile search behaviors, and among the context dimensions, gender, place, activities they engaged in while searching, task importance, portal, and interpersonal relations （whether accompanied or alone when searching） correlated with each other. Research limitations： The sample was comprised entirely of college students, so our findings may not generalize to other populations. More participants and longer experimental duration will improve the accuracy and objectivity of the research. Practical implications： Motivation analysis and search context recognition can help mobile service providers design applications and services for particular mobile contexts and usages. Originality/value： Most current research focuses on specific contexts, such as studies on place, or other contextual influences on mobile search, and lacks a systematic analysis of mobile search context. Based on analysis of the impact of mobile search motivations and search context on search behaviors, we built a multi-dimensional model of mobile search behaviors.

关键词： Mobile search Query formulation Search motivation Search context Contextual dimension

A New Technique for Digital Image Watermarking

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Journal of Computer Science & Technology 2005年第6期20卷 843-848页

作者：伍祥生 information Engineering Department Guangdong Economics and Management College Guangzhou 510400 P.R. China

In this paper, a new technique is proposed for rotation, scaling and translation （RST） invariant image watermarking based on log-polar mappings （LPM） and phase-only filtering （POF）. The watermark is embedded in the LPM of Fourier magnitude spectrum of the original image, and a small portion of resulting LPM spectrum is used to calculate the watermark positions. This technique avoids computing inverse log-polar mapping （ILPM） to preserve the quality of the watermarked image, and avoids exhaustive search to save computation time and reduce false detection. Experimental results demonstrate that the digital watermarking technique is invariant and robust to rotation, scaling, and translation transformation.

关键词： digital image watermarking log-polar mapping

On the Depth Distribution of Constacyclic Codes over Z4 of Length 2e

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Chinese Journal of Electronics 2019年第3期28卷 462-469页

作者： ZHU Shixin HUANG Shan LI Jin School of Mathematics Hefei University of Technology Departmaent of information management Anhui Vocational College of Police Officers

In this paper, we consider the depth distribution of constacyclic codes over Z4with length even prime power. The depth distribution of negacyclic codes over Z4of length 2eis completely ***, we determine the depth spectrum of cycilc codes over Z4of length 2e, and the depth distribution of some cyclic codes over Z4of length 2eis also given.

关键词： Depth spectrum Depth distribution Constacyclic codes