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IET International Conference on Wireless Mobile and Multimedia Networks Proceedings, ICWMMN 2006

作者： Genjian, Yu Baoyu, Zheng Xiaocong, Qian Dept. of Commun. and Inf. Eng. Nanjing Univ. of Posts and Telecommun. Nanjing 210003 China Department of Mathematics and Computer Science Fuzhou University Fuzhou 350002 China

ISBN: (纸本)0863416446

In this paper, we study some transmission capacity theories of hierarchical wireless mobile ad hoc networks (H-MANET). Firstly, we present the structural protocol model, node's mobility tracking model of H-MANET. Secondly, we propose and prove a critical inequality of transmission capacity of H-MANET. Lastly, we propose and prove a gradual probabilistic quality and the specific expression of expectant availability of transmission capacity of H-MANET. The results enrich the theory of Kumar, GP (2000) and the inf.rmation theory of wireless networks in certain degree.

关键词： Radio transmission

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Learning generalized weighted relevance aggregation operators using levenberg-marquardt method

Learning generalized weighted relevance aggregation operator...

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6th International Conference on Hybrid Intelligent Systems and 4th Conference on Neuro-Computing and Evolving Intelligence, HIS-NCEI 2006

作者： Mendis, B.S.U. Gedeon, T.D. Kóczy, L.T. Dept. of Computer Science Australian National University Canberra ACT 0200 Australia Dept. of Computer Science Australian National University Canberra Australia Dept. of Telec. and Media Informatics Budapest University of Tech. and Econ. Budapest Hungary Institute of Inf. Tech. and Elec. Eng. Széchenyi István University Gyor Hungary

ISBN: (纸本)0769526624

We previously introduced the generalized Weighted Relevance Aggregation Operators (WRAO) for hierarchical fuzzy signatures. WRAO enhances the ability of the fuzzy signature model to adapt to different applications and simplifies the learning of fuzzy signature models from data. In this paper we overcome the practical issues which occur when learning WRAO from data. This paper discuss an algorithm for learning WRAO using the Levenberg-Marquardt (LM) method, which is one of the most sophisticated and widely used gradient based optimization method. Also, this paper shows the successful results of applying the proposed algorithm to extract WRAO for two real world problems namely High Salary Selection and SARS Patient Classification. © 2006 IEEE.

关键词： Mathematical operators

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Reasoning about obfuscated private inf.rmation - Who have lied and how to lie

Reasoning about obfuscated private information - Who have li...

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5th ACM Workshop on Privacy in Electronic Society, WPES 2006, Co-located with the 13th ACM Conference on computer and Communications Security, CCS 2006

作者： An, Xiangdong Jutla, Dawn Cercone, Nick Dept. of Finance Inf. Syst. and Manage. Sci. Saint Mary's University Halifax NS B3H 3C3 Canada Faculty of Computer Science Dalhousie University Halifax NS B3H 1W5 Canada

ISBN: (纸本)1595935568

In ubiquitous environments, context sharing among agents should be made privacy-conscious. Privacy preferences are generally specified to govern the context exchanging among agents. Besides who has rights to see what inf.rmation, a user's privacy preference could also designate who has rights to have what obfuscated inf.rmation. By obfuscation, people could present their private inf.rmation in a coarser granularity, or simply in a falsified manner, depending on the specific situations. Nevertheless, people cannot randomly obfuscate their private inf.rmation because by reasoning the recipients could detect the obfuscation. In this paper, we present a Bayesian network-based method to reason about the obfuscation. On the one hand, it can be used to find if the received inf.rmation has been obfuscated, and if so, what the true inf.rmation could be;on the other hand, it can be used to help the obfuscators reasonably obfuscate their private inf.rmation. © 2006 ACM.

关键词： Bayesian networks

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A NEW SOLUTION BASED ON MONTE CARLO TO WIRELESS SENSOR NETWORK DENSITY CONTROL PROBLEM

A NEW SOLUTION BASED ON MONTE CARLO TO WIRELESS SENSOR NETWO...

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IEEE Communications Society Conference on Sensor and Ad Hoc Communications and Networks (SECON)

作者： Jiafu Yufu Dong Tianlin Dept. of Electron. & Inf. Eng. Hangzhou Univ. of Sci. & Technol. Department of Electronics and Information Engineering Huazhong University of Science and Technology China

An effective approach for energy conservation in wireless sensor networks is to schedule sleep intervals for extraneous nodes, while the remaining nodes stay active to provide continuous service. In this paper, we proposed a new scheme based on Monte Carlo algorithm to test whether the nodes deployed in interested region are redundant or not. The computational complexity is only O (n). It also established the coverage collision detection and back-off mechanism applied in the wireless sensor network. The simulation results show that the system can cover all the interested area with least nodes and the coverage void will not appear during the course of state-transition. The coverage collision detection and back-off mechanism proposed in this article can be applied when the nodes both have synchronous and asynchronous mechanism. It also provides a stable stage with the length of the time can be adjusted

关键词： Monte Carlo methods Wireless sensor networks Sleep Energy conservation Computational complexity Processor scheduling Protocols Power engineering and energy Testing Computational modeling

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A multilayer topic-group based P2P network

A multilayer topic-group based P2P network

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International Conference on Advanced inf.rmation Networking and Applications (AINA)

作者： SyuYang Chen Wen-Hsien Tseng Hsing Mei Department of Computer Science and Information Engineering Fu Jen Catholic University Taiwan Fu Jen Catholic University College of Medicine New Taipei City New Taipei City TW Dept. of Comput. Sci. & Inf. Eng. Fu Jen Catholic Univ. Taiwan

Considering that large and various contents are shared over thousands of peers across a P2P network, one challenging problem is to locate the target content in such a large and unorganized environment. Hence, a P2P system designed with the content classification and managed distribution is more efficient and reliable than the mass and unclassified ones. We propose a MLTG (multilayer topic-group) based P2P network. Two core concepts are integrated into the system structure: topic-group and hierarchic layer. Peers act as local peers, delegate peers and super-peers. These peers spread on different hierarchic layers and the system distributes the correlative resources among the same groups. Compared with the traditional P2P schemes, the MLTG is out-performed significantly. From the experiments, it saves up to 90% of query cost for the case of a single keyword query. When the query consists of topic and keywords, it saves up to 93% of cost. MLTG guarantees the enhancement of successful search and lower consumption of bandwidth. It also makes the system more available, reliable and efficient.

关键词： Nonhomogeneous media Costs Bandwidth Peer to peer computing Switches computer science Content management Filters Distributed computing Filtering

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Towards strong mobility in the shared source CLI

Concurrent Systems Engineering Series

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Concurrent Systems engineering Series 2005年 63卷 363-373页

作者： Stewart, Johnston Nixon, Paddy Walsh, Tim Ferguson, Ian SmartLab. Dept. of Comp. and Inf. Sciences University of Strathclyde Glasgow Computer Science Department University College Dublin Dublin 4 Ireland Department of Computer Science University of Dublin Trinity College Dublin Ireland

Migrating a thread while preserving its state is a useful mechanism to have in situations where load balancing within applications with intensive data processing is required. Strong mobility systems, however, are rarely developed or implemented as they introduce a number of major challenges into the implementation of the system. This is due to the fact that the underlying inf.astructure that most computers operate on was never designed to accommodate such a system, and because of this it actually impedes the development of these systems to some degree. Using a system based around a virtual machine, such as Microsoft's Common Language Runtime (CLR), circumnavigates many of these problems by abstracting away system differences. In this paper we outline the architecture of the threading mechanism in the shared source version of the CLR known as the Shared Source Common Language inf.astructure (SSCLI). We also outline how we are porting strong mobility into the SSCLI, taking advantage of its virtual machine.

关键词： Concurrent engineering

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PSteg: Steganographic embedding through patching

PSteg: Steganographic embedding through patching

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2005 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP '05

作者： Petrowski, Kyle Kharrazi, Mehdi Sencar, Husrev T. Memon, Nasir Dept. of Electrical and Computer Eng. Polytechnic University Brooklyn NY United States Dept. of Comp. and Inf. Science Polytechnic University Brooklyn NY United States

ISBN: (纸本)0780388747

In this paper we propose a novel approach to image steganography in which embedding is done without making explicit modifications to the image;that is, the embedding distortion introduced to the cover image is both perceptually and statistically ensured to be less detectable. If an image is divided into blocks and each block is hashed, then the hash values could represent the embedded message content. A set of replacement blocks can be obtained by consecutively capturing images of the same scene (or resampling the incident light). Since image content remains the same and noise is sampled, the set of replacements are statistically compatible while still providing unique hash values. With such an approach the embedder can choose the block with hash value corresponding to the message content without violating any of the natural image statistics. When applied to JPEG images, experiments show that this technique can achieve embedding rates of.063 bits per DCT coefficient or.157 bits per nonzero DCT coefficient while still remaining undetectable by Farid's universal steganalysis tool. © 2005 IEEE.

关键词： Image processing

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Steganalysis of halftone images

Steganalysis of halftone images

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2005 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP '05

作者： Jiang, Ming Wong, Edward K. Memon, Nasir Wu, Xiaolin Dept. of Computer and Inf. Science Polytechnic University Brooklyn NY 11201 Dept. of Electrical and Comp. E. McMaster University Hamilton Ont. L8G 4K1

ISBN: (纸本)0780388747

In this paper, we present a novel steganalysis technique for halftone images without knowledge of the original cover image. We first convert halftone images into grayscale-like images by low-pass filtering. The low-pass-filtered image is then decomposed using quadrature mirror filters, and a set of subband coefficients are generated at different scales and orientations. Next, a set of statistical features are computed from the subband coefficients and their predicated errors. Using Fisher linear discriminant analysis, a statistical classifier is designed to detect marked images. Experimental results demonstrate the effectiveness and accuracy of the proposed technique. © 2005 IEEE.

关键词： Image analysis

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Steganalysis of degraded document images

Steganalysis of degraded document images

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2005 IEEE 7th Workshop on Multimedia Signal Processing, MMSP 2005

作者： Jiang, Ming Wong, Edward K. Memon, Nasir Wu, Xiaolin Dept. of Computer and Inf. Science Polytechnic University Brooklyn NY 11201 United States Dept. of Electrical and Comp. E. McMaster University Hamilton Ont. L8G 4K1 Canada

ISBN: (纸本)0780392892

In this paper, a steganalysis technique using compression bit rate as a distinguishing statistic is presented to detect secret messages embedded in document images that are degraded in quality by printing, photocopying, and/or scanning processes. We consider embedding techniques that flip pixels in binary document images that contain characters and symbols. Noise introduced by printing, photocopying, and/or scanning can be modelled by a local optical distortion process. Steganographic embedding is modelled as an additive noise process and we use compression bit rate as a distinguishing statistic to discriminate between stego images and unmarked images. Experimental results showed that the proposed technique can detect stego images wtih reasonably good accuracy, given the inherent difficulty of the problem.

关键词： Image retrieval

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Reasoning about software architecture-based regression testing through a case study

Reasoning about software architecture-based regression testi...

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29th Annual International computer Software and Applications Conference, COMPSAC 2005

作者： Muccini, Henry Dias, Marcio Richardson, Debra J. Dipartimento di Informatica University of l'Aquila L'Aquila Italy Dept. of Computer Science e-Science Research Institute University of Durham Durham United Kingdom Donald Bren School of Inf. and Computer Sciences University of California Irvine Irvine CA United States

ISBN: (纸本)0769522092

Two main issues need to be covered when dealing with the dependability of component-based systems: quality assurance of reusable software components and quality assurance of the assembled component-based system. By focussing on the assembly, a software architecture specification of a component-based system allows to explicitly model the structure and required system behavior by specifying how components and connectors are intended to interact. Software architecture-based conformance testing techniques can yield confidence on the implementation conformance to expected structural and behavioral properties as specified in the architectural models. In this paper we explore software architecture-based regression testing methods that enable reuse of earlier saved results to test if a different assembly of components conforms to the evolved software architecture. The approach is presented through a running example. © 2005 IEEE.

关键词： Software architecture

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