检索结果-内蒙古大学图书馆

Method for identify service providers of user privacy information disclosure

Tongxin Xuebao/Journal on Communications 2011年第9 A期32卷 238-245页

作者： Gao, Feng He, Jing-Sha Zhang, Feng College of Computer Science and Technology Beijing University of Technology Beijing 100124 China School of Software Engineering Beijing University of Technology Beijing 100124 China Beijing Key Laboratory of Intelligent Telecommunications Software and Multimedia Beijing University of Posts and Telecommunications Beijing 100876 China

By research on the privacy disclosure issue in cloud computing, a method for identify privacy disclosure service providers was proposed. Firstly, an optional signature process and a resistant attack method were introduced. Then an analysis center with text classification and service classification based analysis algorithm also with testing method was present to identify the privacy disclosure service providers. Analyze and simulation results show the method can identify privacy disclosure service providers well.

关键词： Cloud computing

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Unconventional emergency modeling based on scenario and ontology

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Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and technology) 2011年第SUPPL. 1期42卷 835-840页

作者： Wang, Su Du, Jun-Ping Gao, Tian Beijing Key Laboratory of Intelligent Telecommunication Software and Multimedia School of Computer Science Beijing University of Posts and Telecommunications Beijing 100876 China

With the characteristics of sudden outbreak and inadequate precursors of unconventional emergency, the traditional emergency disposal systems based on data model can hardly reponse to the undefined and unexpected situation quickly. The three layers model of scenario-ontology-data schema mapping was proposed. By using the mapping model, the scenarioe sets can be built agilely to describe the new unconventional emergency type, the scenarioes and factual event data are linked and the unconventional emergencies will be reponsed and disposed effectively. And the method of scenario-based analysis, combined with multi-agent technology, was used to design and implement the multi-agent system of unconventional emergency modeling.

关键词： Ontology

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Semantic image classification of a Relief-F feature weighting based SVM method for performance

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Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and technology) 2011年第SUPPL. 1期42卷 750-754页

作者： Liu, Jie Du, Jun-Ping Beijing Key Laboratory of Intelligent Telecommunication Software and Multimedia School of Computer Science Beijing University of Posts and Telecommunications Beijing 100876 China

A Relief-F feature weighting based support vector machine (SVM) method for semantic image classification was proposed. Firstly, the feature weight of images in training data set was computed by the Relief-F algorithm;Then, the SVM classifier was trained by taking advantage of the feature vector with different weights;Finally, the automatic classification of images in the test data set was presented by using trained SVM classifier. Experimental results show that the Relief-F feature weighting based SVM classifier is better than the traditional SVM classifier both in classification accuracy and training time-consuming in semantic image classification.

关键词： Support vector machines

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STUDY ON FOOD SAFETY ONTOLOGY REASONING APPLICATION BASED ON JENA

STUDY ON FOOD SAFETY ONTOLOGY REASONING APPLICATION BASED ON...

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2011 International Conference on Communications technology and Applications(2011年通信技术与应用国际会议 ICCTA 2011)

作者： Yuehua Yang Juan Hu Junping Du Beijing Key Laboratory of Intelligent Telecommunication Software and Multimedia School of Computer S Department of Information and Technology Beijing College of Politics and Law Beijing 100024 China

ISBN: (纸本)9781618399267

This study constructs a food safety ontology which adopts OWL (Web Ontology Language) to represent food safety knowledge in a structural way in order to help knowledge requesters clearly understand food safety knowledge;subsequently designs some ontology reasoning rules for deducing food safety knowledge in order to share and reuse relevant food safety knowledge effectively;finally implement an ontology-based food safety knowledge reasoning mechanism. Results of this study facilitate the food safety knowledge storage, management and sharing to provide knowledge requesters with accurate and comprehensive food safety knowledge for problem solving and decision support.

关键词： food safety ontology Jena reasoning rules

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Robust L_(2) - L_(infinity) Consensus Control of the Second-order Multi-agent Systems with Time-delay

Robust L_(2) - L_(infinity) Consensus Control of the Second-...

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IEEE Conference on Decision and Control

作者： Yan Cui Yingmin Jia Junping Du Fashan Yu Seventh Research Division and the Department of Systems and Control Beihang University Beijing 100191 China Beijing Key Laboratory of Intelligent Telecommunications Software and Multimedia School of Computer Science and Technology Beijing University of Posts and Telecommunications Beijing 100876 China School of Electrical Engineering and Automation Henan Polytechnic University Jiaozuo 454000 Henan China

ISBN: (纸本)9781612848006

Robust L_(2) - L_(infinity) consensus control is studied for the second-order multi-agent systems with external disturbances and parameter uncertainties. By defining an appropriate controlled output, the consensus problem of the systems is transformed into a normal L_(2) - L_(infinity) control problem, and distributed state feedback protocols with time-delay are proposed. Sufficient conditions are established for the convergence to consensus of the network under fixed or switching topology. Numerical simulations are provided to demonstrate the effectiveness of our theoretical results.

关键词： Topology Europe

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Collision Avoidance Maneuver Design Based on Equidistance Interpolation

Collision Avoidance Maneuver Design Based on Equidistance In...

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IEEE Conference on Decision and Control

作者： Yongqiang Qi Yingmin Jia Junping Du Fashan Yu Seventh Research Division and the Department of Systems and Control Beihang University (BUAA) Beijing 100191 China Beijing Key Laboratory of Intelligent Telecommunications Software and Multimedia School of Computer Science and Technology Beijing University of Posts and Telecommunications Beijing 100876 China School of Electrical Engineering and Automation Henan Polytechnic University Jiaozuo 454000 Henan China

ISBN: (纸本)9781612848006

This paper deals with the active collision avoidance maneuver for the chaser along the specified trajectory, and presents a maneuver approach with constant thrust. Using the 3D stereo vision measurement, The relative position parameters of the target spacecraft for analyzing the collision possibility are obtained by using the vision measurement and the target maneuver positions are calculated through the equidistance interpolation method. The working times of thrusters in three axes can be respectively computed by the time series analysis method. In particular, the perturbation and fuel consumption are addressed during the computation of working time. Furthermore, the acceleration sequences and the corresponding working time series can be employed to determine a switching control law for the active collision avoidance maneuver. The simulation results show that the switch control law can effectively guarantee the chaser moving along the specified trajectory.

关键词： Constant thrust Vision measurement Switch control law The specified trajectory Equidistance interpolation

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Two alternative approaches to stochastic discrete-time iterative learning control systems

Two alternative approaches to stochastic discrete-time itera...

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IEEE Conference on Decision and Control

作者： Deyuan Meng Yingmin Jia Junping Du Fashan Yu Seventh Research Division and the Department of Systems and Control Beihang University (BUAA) Beijing 100191 China Beijing Key Laboratory of Intelligent Telecommunications Software and Multimedia School of Computer Science and Technology Beijing University of Posts and Telecommunications Beijing 100876 China School of Electrical Engineering and Automation Henan Polytechnic University Jiaozuo 454000 Henan China

ISBN: (纸本)9781612848006

This paper aims to address the robust convergence problem that arises from discrete-time iterative learning control (ILC) systems subject to random disturbances. Two alternative approaches are considered in order to achieve the perfect output tracking of the stochastic discrete-time ILC systems in the sense of both expectation and variance, which use the tracking error and the input error for analysis, respectively. It is shown that the convergence results of two approaches to ILC can be established by developing some statistical expressions in super-vector forms. Moreover, it is demonstrated that the convergence results of two approaches to ILC are not always equal, and they can keep the same only in the case where the controlled plants are square.

关键词： Iterative learning control discrete-time systems random disturbances

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Column Formation Control of Multi-robot Systems with Input Constraints

Column Formation Control of Multi-robot Systems with Input C...

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IEEE Conference on Decision and Control

作者： Xiaohan Chen Yingmin Jia Junping Du Fashan Yu Seventh Research Division and the Department of Systems and Control Beihang University (BUAA) Beijing 100191 China Beijing Key Laboratory of Intelligent Telecommunications Software and Multimedia School of Computer Science and Technology Beijing University of Posts and Telecommunications Beijing 100876 China School of Electrical Engineering and Automation Henan Polytechnic University Jiaozuo 454000 Henan China

ISBN: (纸本)9781612848006

This paper is concerned with the column formation control of multi-robot systems that are subject to input constraints. A new leader-follower setup is proposed, under which the Lyapunov method can provide a simple controller in terms of two feedback parameters. It is shown that using an elliptic approximation to input constraints, the two feedback parameters can be obtained directly with a geometric analysis method. Moreover, a sufficient condition is presented for the leader robot to guarantee that the desired column formation can be achieved, with which a particular controller is designed by selecting two appropriate functions for the feedback parameters. Simulation results are included to verify the effectiveness of the proposed theoretical results.

关键词： Column formation control multi-robot systems leader-follower input constraints elliptic approximation

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Gaussian mixture PHD filter for multiple maneuvering extended targets tracking

Gaussian mixture PHD filter for multiple maneuvering extende...

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IEEE Conference on Decision and Control

作者： Wenling Li Yingmin Jia Junping Du Fashan Yu Seventh Research Division and the Department of Systems and Control Beihang University (BUAA) Beijing 100191 China Beijing Key Laboratory of Intelligent Telecommunications Software and Multimedia School of Computer Science and Technology Beijing University of Posts and Telecommunications Beijing 100876 China School of Electrical Engineering and Automation Henan Polytechnic University Jiaozuo 454000 Henan China

ISBN: (纸本)9781612848006

This paper addresses the problem of tracking multiple maneuvering extended targets in the framework of random finite set theory. An elliptical model is adopted for exploiting sensor measurements of target extent, and the target dynamics is described by a jump Markov linear system which combines the shape parameters into the kinematic state vector. As each extended target gives rise to unlabeled multiple measurements per time step, all the received measurements are partitioned into a number of subsets so that the measurements in each subset are expected to stem from the same source. In addition, the best-fitting Gaussian approximation approach is employed to circumvent the difficulty of multiple model mixing in the Gaussian mixture probability hypothesis density (GM-PHD) filter. A numerical example is provided to compare the performance of the proposed filter with that of the GM-PHD filter without measurement partition.

关键词： Maneuvering Filters shape parameter extended target Gauss Subset numerical example

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Fault analysis study of the block cipher FOX64

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multimedia Tools and Applications 2011年第3期63卷 691-708页

作者： Li, Ruilin You, Jianxiong Sun, Bing Li, Chao Department of Mathematics and System Science Science College National University of Defense Technology Changsha China State Key Laboratory of Information Security Institute of Software Chinese Academy of Sciences Beijing China College of Computer National University of Defense Technology Changsha China

FOX is a family of symmetric block ciphers from MediaCrypt AG that helps to secure digital media, communications, and storage. The high-level structure of FOX is the so-called (extended) Lai–Massey scheme. This paper presents a detailed fault analysis of the block cipher FOX64, the 64-bit version of FOX, based on a differential property of two-round Lai–Massey scheme in a fault model. Previous fault attack on FOX64 shows that each round-key (resp. whole round-keys) could be recovered through 11.45 (resp. 183.20) faults on average. Our proposed fault attack, however, can deduce any round-key (except the first one) through 4.25 faults on average (4 in the best case), and retrieve the whole round-keys through 43.31 faults on average (38 in the best case). This implies that the number of needed faults in the fault attack on FOX64 can be significantly reduced. Furthermore, the technique introduced in this paper can be extended to other series of the block cipher family FOX.

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