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Perfect Concurrent Signature Protocol

ACIS International Conference on software engineering, Artificial Intelligence, Networking, and Parallel/Distributed Computing (SNPD)

作者： Zhenjie Huang Rufen Huang Xuanzhi Lin Department of Computer Science and Engineering Zhangzhou Normal University Fujian China State Key Laboratory of Information Security Institute of Software Chinese Academy and Sciences Beijing China

The concept of concurrent signatures was introduced by Chen, Kudla and Paterson in their seminal paper in Eurocrypt 2004 which allows two entities to produce two signatures in such a way that, the signer of each signature is ambiguous from any third party's point of view until the release of a secret, known as the keystone. Once the keystone is released, both signatures become binding to their respective signers concurrently. Later, a stronger notion called perfect concurrent signatures with two concrete schemes was proposed by Susilo, Mu and Zhang. In perfect concurrent signatures, although both signers are known to be trustworthy, the two signatures are still ambiguous to any third party. Unfortunately, Susilo et al.'s schemes are unfair. In this paper, we first show that in their schemes the initial signer can cheat the matching signer by carefully choosing some communication value and then propose fair perfect concurrent signature protocol to fix our attacks.

关键词： Protocols Concrete software engineering Artificial intelligence Distributed computing computer science Laboratories information security Certification

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Design of a distributed mixed reality system for construction simulation

Design of a distributed mixed reality system for constructio...

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2007 ASCE International Workshop on Computing in Civil engineering

作者： Wang, Hui Hammad, Amin Mudur, Sudhir P. Department of Computer Science and Software Engineering Concordia University 1455 De Maisonneuve Blvd. West Montreal QC H3G 1M8 Canada Concordia Institute for Information Systems Engineering Concordia University 1515 Ste-Catherine Street West Montreal QC H3G 2W1 Canada

ISBN: (纸本)0784409374

This paper describes the design of an outdoor Distributed Mixed Reality (DMR) system to support multi-user interaction of multi-users and virtual object manipulations in a construction simulation. The proposed DMR system is based on an interactive animation system of operating virtual cranes and extends previous work in a significant manner by considering engineering constraints. Our design integrates a Head-Mounted Display, a GPS receiver, a 3D motion sensor, and a portable computer to carry out a construction simulation which can be run in the outdoors. We describe and evaluate the system design challenges and possible solutions for simulating multi-user collaborative construction activities within the DMR environment. Several issues related to tracking and registration, modeling, user interaction, and mobile networking are discussed. The proposed system prototype is demonstrated using a case study which simulates the deck rehabilitation project of a bridge. Using this system, two users can collaborate to replace a section of the bridge deck by operating two virtual cranes and communicating with each other. © 2007 American Society of Civil Engineers.

关键词： Microcomputers

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Support Vector Machines applied to automated categorization of facial expressions

Support Vector Machines applied to automated categorization ...

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3rd Indian International Conference on Artificial Intelligence, IICAI 2007

作者： Md. Sohail, Abu Sayeed Bhattacharya, Prabir Department of Computer Science and Software Engineering Concordia University 1455 de Maisonneuve Blvd. West Montreal QC H3G 1M8 Canada Concordia Institute for Information Systems Engineering Concordia University 1515 St. Catherine West Montreal QC H3G 2W1 Canada

ISBN: (纸本)9780972741224

This paper describes a fully automated technique for detection and categorization of the seven basic facial expressions using Support Vector Machines (SVM). Facial expressions are communicated by subtle changes in one or more discrete features such as tightening the lips, raising the eyebrows, opening and closing of eyes or certain combinations of them, which can be identified through monitoring the changes in muscles movements (Action Units), located near about the regions of mouth, eyes and eyebrows. An analytic representation of face with fifteen feature points has been used that represent and identify the principle muscle actions as well as provide measurements of the discrete features responsible for each of the seven basic human emotions. Detection of these fifteen points of interest from the regions of eyes, eyebrows nose and mouth have been performed applying a standard image processing based multi-detector approach for facial feature point localization. The feature vector composed of fifteen features is then obtained by calculating the degree of displacement of five different pairs of points, and measuring the deviations of ten points from a non-changeable rigid point. Finally, obtained feature sets are used to train a SVM classifier so that it can categorize facial expressions when given to it in the form of a feature set. The developed automated facial expressions categorization system has been tested extensively on two publicly available facial expression databases and 91.30% and 84.07% of average successful categorization rate have been achieved. Copyright © 2007 IICAI.

关键词： Support vector machines

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Securing Agent-Oriented Systems: An Argumentation and Reputation-based Approach

Securing Agent-Oriented Systems: An Argumentation and Reputa...

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International Conference on information Technology: New Generations (ITNG)

作者： Jamal Bentahar John-Jules Ch. Meyer Bernard Moulin Concordia Institute forInformation SystemsEngineering Concordia University Canada Department of Information& Computer Science University of Utrecht Netherlands Department of ComputerScience & Software Engineering Laval University Canada

In this paper, we propose a new model for securing agent-based systems in which agents are equipped with reasoning capabilities allowing them to interact with each other. The agents can reason about the reputation of each other using their argumentation systems. The reputation is dealt with as a quantitative value computed using a set of parameters based on the interaction histories and the notion of social networks. The problem of securing autonomous interacting agents in a distributed setting is core to a number of applications, particularly the emerging semantic grid computing-based applications such as e-business. Current approaches fail to adequately address the challenges of security in these emerging applications. These approaches are either centralized on mechanisms such as digital certificates, and thus are particularly vulnerable to attacks, or are not suitable for argumentation-based agent systems in which agents use advanced reasoning capabilities

关键词： Distributed computing Application software Protocols computer science computer applications Grid computing Security Multiagent systems information systems Systems engineering and theory

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Collaborative filtering recommendation algorithm based on cloud model

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Ruan Jian Xue Bao/Journal of software 2007年第10期18卷 2403-2411页

作者： Zhang, Guang-Wei Li, De-Yi Li, Peng Kang, Jian-Chu Chen, Gui-Sheng State Key Laboratory of Software Development Environment Beihang University Beijing 100083 China Institute of Electronic System Engineering Beijing 100840 China Information Security Center Shenzhen Graduate School Harbin Institute of Technology Shenzhen 518055 China School of Computer Science and Technology Shandong Jianzhu University Ji'nan 250101 China

Recommendation system is one of the most important technologies applied in e-commerce. Similarity measuring method is fundamental to collaborative filtering algorithm, and traditional methods are inefficient especially when the user rating data are extremely sparse. Based on the outstanding characteristics of Cloud Model on the process of transforming a qualitative concept to a set of quantitative numerical values, a novel similarity measuring method, namely the likeness comparing method based on cloud model (LICM) is proposed in this paper. LICM compares the similarity of two users on knowledge level, which can overcome the drawback of attributes' strictly matching. This work analysis traditional methods throughly and puts forward a novel collaborative filtering algorithm, which is based on the LICM method. Experiments on typical data set show the excellent performance of the present collaborative filtering algorithm based on LICM, even with extremely sparsity of data.

关键词： Electronic commerce

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The Design and Realization of CAT with Cognitive Diagnosis based on Formal Concept Analysis

The Design and Realization of CAT with Cognitive Diagnosis b...

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International Conference on Natural Computation (ICNC)

作者： Shuqun Yang Shuliang Ding Xiaodong Zhu Qiulin Ding College of Information Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing China Faculty of Software Fujian Normal University Fuzhou China Computer Information Engineering Institute Jiangxi Normal University Nanchang China

In this paper, combined with Tatsuoka 's Rule Space Model and the Attribute hierarchy Method (AHM), Formal Concept Analysis (FCA) is firstly applied into computerized Adaptive Testing (CAT). Based on FCA, an initiatory and systemic CAT with cognitive diagnosis (CD) is designed, which diagnoses examinees real time. The result of Monte Carlo study shows that examinees ' knowledge states are well diagnosed and the precision in examinees ' abilities estimation is satisfied.

关键词： Testing Space technology State estimation Government Psychology Educational institutions information science Electronic mail information analysis Real time systems

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Moving Schemes for Mobile Sinks in Wireless Sensor Networks

Moving Schemes for Mobile Sinks in Wireless Sensor Networks

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IEEE International Conference on Performance, Computing and Communications (IPCCC)

作者： Yanzhong Bi Jianwei Niu Limin Sun Wei Huangfu Yi Sun Institute of Software Chinese Academy and Sciences Beijing China School of Computer Science and Engineering Beihang University Beijing China College of Information Sciences and Engineering Graduate University of Academy of Sciences Beijing China

In a wireless sensor network for data-gathering applications, if all network data congregate to a stationary sink node hop by hop, the sensor nodes near the sink have to consume more energy on forwarding data for other nodes, which probably causes the early function loss of the sensor network. Employing a mobile sink can alleviate the hotspot problem and balance the energy consumption among the sensor nodes. In this paper, we propose two autonomous moving schemes for the mobile sink. In our schemes, the sink makes moving decisions without complete knowledge of network topology and the energy distribution of all sensor nodes. We evaluated the performance of our moving schemes by simulation and the results show that both the two schemes can extend the network lifetime prominently.

关键词： Wireless sensor networks Energy consumption Sun Research and development Relays Energy efficiency Bismuth computer science Educational institutions Power engineering and energy

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Data caching in data integration systems based on AXML technology

Data caching in data integration systems based on AXML techn...

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International Workshop on Database and Expert Systems Applications

作者： Marcin Marczewski Tadeusz Pankowski IBM Software Laboratory Cracow Poland Faculty of Mathematics and Computer Science Adam슠Mickiewicz University Poznan Poland Institute of Control and Information Engineering Poznań University of Technology Poland

AXML (active XML) is a framework for peer-to-peer data integration from XML sources. In AXML documents data can be presented extensionally or intentionally by including calls to local or remote Web services. In complex AXML-based systems data retrieval can be inefficient. In the paper we propose a caching mechanism for systems based on active XML. We show how it can influence network communication and data integration processes.

关键词： Web services XML Peer to peer computing Simple object access protocol information retrieval Database languages Expert systems Application software Control systems Data engineering

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Filtering of discrete linear repetitive processes with ∞ and 2-∞ performance

Filtering of discrete linear repetitive processes with ∞ an...

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2007 IEEE International Symposium on Circuits and Systems, ISCAS 2007

作者： Ligang, Wu Lam, James Paszke, Wojciech Galkowski, Krzysztof Rogers, Eric Kummert, Anton Space Control and Inertial Technology Research Center Harbin Institute of Technology Harbin 150001 China Department of Mechanical Engineering University of Hong Kong Pokfulam Road Hong Kong Hong Kong Institute of Control and Computation Engineering University of Zielona Góra 65-246 Zielona Góra Poland School of Electronics and Computer Science University of Southampton Southampton SO17 IBJ United Kingdom University of Wuppertal Faculty of Electrical Information and Media Engineering Communication Theory

This paper considers the general filtering problem for a distinct class of two-dimensional (2-D) discrete linear systems, i.e. information propagation in two independent directions, known as discrete linear repetitive processes which are of both system-theoretic and applications interest. In particular, new results on the design of filters with guaranteed levels of performance are developed. These take the form of algorithms for the design of an ∞ and 2-∞ dynamic output feedback filter which guarantees that the resulting filtering error process is stable and has prescribed disturbance attenuation performance as measured by ∞ and 2- ∞ norms. © 2007 IEEE.

关键词： Signal filtering and prediction

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A Connection Degree-Based Rough Sets Model and its Application to Knowledge Reduction

A Connection Degree-Based Rough Sets Model and its Applicati...

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ACIS International Conference on software engineering, Artificial Intelligence, Networking, and Parallel/Distributed Computing (SNPD)

作者： Liuling Dai Bing Huang Dongxiao Yang School of Software Beijing Institute of Technology Beijing China School of Computer Science and Technology School of Management and Engineering Nanjing Audit University Nanjing China Department of Information Science and Technology Jining Medical College Jining China

Knowledge reduction is one of the most important issues in rough sets theory. Many works are related to connection-degree-based rough sets model to treat incomplete information systems. However, the model is not used to knowledge reduction. In this paper, a connection-degree-based rough sets model is proposed and used to knowledge reduction. Two ways for knowledge reduction are proposed and the relationships between them are shown. A knowledge reduction algorithm is also shown for incomplete information systems. The algorithm is based on elementary discernibility matrix and the significance degree of an attribute. Examples are used to show that the validity of the algorithm.

关键词： Rough sets information systems software engineering Artificial intelligence Distributed computing Application software computer science computer network management Conference management Knowledge management

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