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IEEE/IFIP International Conference on Embedded and Ubiquitous Computing, EUC

作者： Lei Zhang Qianhong Wu Josep Domingo-Ferrer Bo Qin UNESCO Chair in Data Privacy Department of Computer Engineering and Mathematics Universitat Rovira i Virgili Catalonia Spain School of Computer Key Laboratory of AeroSpace Information Security and Trusted Computing Wuhan University of Technology China School of Science Department of Maths Xi'an University of Technology China

Certificateless cryptography eliminates the key escrow problem in identity-based cryptography. Hierarchical cryptography exploits a practical security model to mirror the organizational hierarchy in the real world. In this paper, to incorporate the advantages of both types of cryptosystems, we instantiate hierarchical certificate less cryptography by formalizing the notion of hierarchical certificate less signatures. Furthermore, we propose an HCLS scheme which, under the hardness of the computational Diffie-Hellman (CDH) problem, is proven to be existentially unforgeable against adaptive chosen-message attacks in the random oracle model. As to efficiency, our scheme has constant complexity, regardless of the depth of the hierarchy. Hence, the proposal is secure and scalable for practical applications.

关键词： Public key Games Artificial intelligence Tin Protocols

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Cooperative MIMO transmission scheme for the DVB-T2 system

Cooperative MIMO transmission scheme for the DVB-T2 system

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International Conference on information and Communication technology Convergence (ICTC)

作者： Soonbae Ji Junghyun Kim Cheolwoo You Sunghyun Cho Dongho Kim Yehoon Lee Department of Information and Communication Engineering Myong-Ji University Yongin Korea Myongji University Seodaemun-gu Seoul KR Department of Computer Science Gyeongsang National University Jinju Korea Department of Media Engineering and Electronic and information Engineering Seoul National University of Science and Technology Seoul Korea

The Digital Video Broadcasting second generation Terrestrial (DVB-T2) standard purposes to provide high definition digital video and high rate services for the same spectrum allocation of the current Digital Video Broadcasting Terrestrial (DVB-T) standard. The implementation guideline is provided by the DVB-T2 standardization community, the Digital Video Broadcasting (DVB) Project. The DVB Project is requesting the many submission technologies which could be considered as candidates for a second generation terrestrial transmission system. The most challenging requirements introduced by the DVB-T2 specification are an Fast Fourier Transform (FFT) size of up to 32k samples, 256-Quadrature amplitude modulation (QAM) and Low-Density Parity-Check (LDPC) coding with a block size of 64k bits. The increasing concern in Multiple-Input Multiple-Output (MIMO) systems has given rise to numerous research activities in recent years. In this paper, we propose the MIMO architecture and coded cooperative MIMO transmission scheme for DVB-T2 system. The simulation result of the proposal MIMO architecture in DVB-T2 system shows a definite performance improvement for coded cooperative MIMO system.

关键词： Decision support systems OFDM Encoding MIMO Time frequency analysis Frequency modulation Silicon

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Document clustering with semantic features and fuzzy association

Communications in Computer and Information Science

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Communications in computer and information Science 2010年 54卷 167-175页

作者： Park, Sun An, Dong Un Cha, ByungRea Kim, Chul-Won Advanced Graduate Education Center of Jeonbuk for Electronics and Information Technology BK21 Chonbuk National University Korea Republic of Division of Electronic and Information Engineering Chonbuk National University Korea Republic of Network Media Lab. GIST Korea Republic of Department of Computer Engineering Honam University Korea Republic of

ISBN: (纸本)9783642120343

This paper proposes a new document clustering method using the semantic features and fuzzy association. The proposed method can improve the quality of document clustering because the clustered documents by using fuzzy association values to distinguish well dissimilar documents, the selected cluster label term by semantic features, which is used in document clustering, can represent an inherent structure of document set better. The experimental results demonstrate that the proposed method achieves better performance than other document clustering methods. © 2010 Springer-Verlag Berlin Heidelberg.

关键词： Cluster analysis

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Facial expression synthesis based on emotion dimensions for affective talking avatar

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Smart Innovation, Systems and Technologies 2010年第1期2010卷 109-132页

作者： Zhang, Shen Wu, Zhiyong Meng, Helen M. Cai, Lianhong Key Laboratory of Pervasive Computing Ministry of Education Tsinghua National Laboratory for Information Science and Technology Department of Computer Science and Technology Tsinghua University Beijing 100084 China Tsinghua-CUHK Joint Research Center for Media Sciences Technologies and Systems Graduate School at Shenzhen Tsinghua University Shenzhen China Department of Systems Engineering and Engineering Management The Chinese University of Hong Kong HKSAR Hong Kong

ISBN: (纸本)9783642126031

Facial expression is one of the most expressive ways for human beings to deliver their emotion, intention, and other nonverbal messages in face to face communications. In this chapter, a layered parametric framework is proposed to synthesize the emotional facial expressions for an MPEG4 compliant talking avatar based on the three dimensional PAD model, including pleasure-displeasure, arousal-nonarousal and dominance-submissiveness. The PAD dimensions are used to capture the high-level emotional state of talking avatar with specific facial expression. A set of partial expression parameter (PEP) is designed to depict the expressive facial motion patterns in local face areas, and reduce the complexity of directly manipulation of low-level MPEG4 facial animation parameters (FAP). The relationship among the emotion (PAD), expression (PEP) and animation (FAP) parameter is analyzed on a virtual facial expression database. Two levels of parameter mapping are implemented, namely the emotion-expression mapping from PAD to PEP, and the linear interpolation from PEP to FAP. The synthetic emotional facial expression is combined with the talking avatar speech animation in a text to audio visual speech system. Perceptual evaluation shows that our approach can generate appropriate facial expressions for subtle and complex emotions defined by PAD and thus enhance the emotional expressivity of talking avatar. © Springer-Verlag Berlin Heidelberg 2010.

关键词： Mapping

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Extending the concept of tensor product modelling for delayed systems

Extending the concept of tensor product modelling for delaye...

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International Symposium on Intelligent Systems and Informatics (SISY)

作者： Péter Galambos Péter Baranyi Péter Korondi Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary Department of Manufacturing Science and Technology Budapest University슠of슠Technology슠and슠Economics Hungary Department of Telecommunications and Media Informatics Budapest University슠of슠Technology슠and슠Economics Hungary Department of Mechatronics Optics and Information Engineering Budapest University슠of슠Technology슠and슠Economics Hungary

Feedback delays are inherent attributes of distributed control systems that usually cause unfavorable effect on the stability of the controlled process. Modelling of such systems is essential for traceable controller synthesis. In this paper we apply the TP Model Transformation to derive a polytopic representation of an LPV model where the time-delay is considered as parameter. The method is introduced via a single degree of freedom impedance model with feedback delay. The resulted model is validated by simulation.

关键词： Mathematical model Delay Computational modeling Tensile stress Biological system modeling Impedance Numerical models

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Using advanced encryption standard to secure the content dissemination of electronic braille books 09

Using advanced encryption standard to secure the content dis...

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3rd International Convention on Rehabilitation engineering and Assistive technology, i-CREATe 2009

作者： Charoenchaimonkon, Eakachai Janecek, Paul Hamratanaphon, Vatcharin Department of Computer Science and Information Management School of Engineering and Technology Asian Institute of Technology Pathumthani Thailand Section for Promotion of Educational Media Production for Students with Disabilities Centre for Educational Technology Ministry of Education Bangkok Thailand

ISBN: (纸本)9781605587929

The scarcity of accessible information mediums for visually impaired people is recognized by many international organizations. The situation is even worse for those students with visual impairment who have integrated themselves into mainstream schools with their sighted peers. Although there are a few online information services available like Braille and digital talking books to serve the needs of visually impaired school students, these information services face a number of restrictions, such as accessing book content with minimal cost of investment, handling the complicated transcribing and brailing task, and respecting the issue of legal distribution. This research aims to develop an application named 'CET Embossing Manager'. With the aid of this software, Electronic Braille producers and consumers can access various types of electronic Braille file formats, view the content of the file, and handle various tasks of embossing. To make the content of the book secured, Advanced Encryption Standard (AES) or Rijndael is used to protect the file from modifications made by unauthorized parties and limit the number of republishing. © ACM 2009.

关键词： information services

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Investigation of Dispersion Characteristics of Composites

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PAMM 2010年第1期10卷

作者： Alexander Karmazin Evgenia Kirillova Wolfgang Seemann Pavel Syromyatnikov Chair for Engineering Mechanics Karlsruhe Institute of Technology Kaiserstraße 10 76131 Karlsruhe Design Computer Science Media RheinMain University of Applied Sciences Kurt-Schumacher-Ring 18 65197 Wiesbaden Department of Computer Technologies and Applied Mathematics Kuban State University Stavropolskaya 149 350040 Krasnodar Russia

This numerical study of dispersion characteristics of some symmetric and asymmetric composites modelled as multilayered packets of layers with arbitrary anisotropy of each layer is carried out. The authors introduce a subsidiary boundary problem of three-dimensional theory of elasticity for the system of partial differential equations describing the harmonic oscillations of the composite excited by a surface load. The authors obtained the curves and surfaces describing slowness of the wave front of Lamb waves propagating with respect to the direction of propagation. The method suggested by the authors of the present article does not impose any restrictions on the type of elastic anisotropy of the layers, their orientations and mutual positions. (© 2010 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim)

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Construction and analysis of corpus of Japanese classroom lecture speech contents

Construction and analysis of corpus of Japanese classroom le...

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Asia-Pacific Signal and information Processing Association 2009 Annual Summit and Conference, APSIPA ASC 2009

作者： Tsuchiya, Masatoshi Kogurey, Satoru Nishizakiz, Hiromitsu Yamamotox, Kazumasa Nakagawax, Seiichi Information and Media Center Toyohashi University of Technology Toyohashi 441-8580 Aichi Japan Faculty of Informatics Shizuoka University Hamamatsu 432-8011 Shizuoka Japan Department of Research Interdisciplinary Graduate School of Medicine and Engineering University of Yamanashi Kofu 400-8511 Yamanashi Japan Department of Information and Computer Sciences Toyohashi University of Technology Toyohashi 441-8580 Aichi Japan

This paper explains our developing Corpus of Japanese classroom Lecture speech Contents (henceforth, denoted as CJLC). Increasing e-Learning contents demand a sophisticated interactive browsing system for themselves, however, existing tools do not satisfy such a requirement. Many researches including large vocabulary continuous speech recognition and extraction of important sentences against lecture contents are necessary in order to realize the above system. CJLC is designed as their fundamental basis, and consists of speech, transcriptions, and slides that were collected in real university classroom lectures.

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Pathways towards Next Generation Cognitive Ubiquitous Networks (Keynote Lecture)

Pathways towards Next Generation Cognitive Ubiquitous Networ...

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WRI International Conference on Communications and Mobile Computing, CMC

作者： Khaled Ben Letaief Electronic and Computer Engineering Department Hong Kong Telecom Institute of Information Technology Hong Kong China Chair Professor and Head Electronic and Computer Eng. Department The Hong Kong University of Science and Technology

Over the past decade, wireless communications has seen an exponential growth and will certainly continue to witness spectacular developments due to the emergence of new interactive multimedia applications and highly integrated systems driven by the rapid growth in information services and microelectronic devices. So far, most of the current mobile systems are mainly targeted to voice communications with low transmission rates. In the near future, however, broadband data access at high transmission rates will be needed to provide users packet-based connectivity to a plethora of services. It is also almost certain that the neXt Generation (XG) wireless systems will consist of complementary systems with a set of different standards and technologies along with different requirements and complementary capabilities that will offer users ubiquitous wireless connectivity between mobile and desktop computers, machines, game systems, cellular phones, consumer electronic products, and other hand-held devices. A key requirement in future wireless systems is their ability to provide broadband connectivity with end-to-end quality of service (QoS), a high network capacity, and throughput at a low cost. This talk will present an overview of the most recent trends along with the evolution of wireless systems. It will also describe and discuss the challenges facing the XG broadband systems with a special interest on cognitive ubiquitous communications networks, cooperative communications, dynamic resource allocation, along with cross-layer design and optimization.

关键词： Next generation networking Quality of service Wireless communication Multimedia systems Microelectronics Mobile communication Ubiquitous computing Mobile computing Handheld computers Pervasive computing

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Ultrasonic echo image adaptive watermarking using the just-noticeable difference estimation

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World Academy of Science, engineering and technology 2009年 36卷 366-370页

作者： Khawne, Amnach Hamamoto, Kazuhiko Chitsobhuk, Orachat Department of Information Media Technology School of Information and Communication Engineering Tokai University 1117 Kitakaname Hiratsuka-shi Kanagawa 259-1292 Japan Department of Computer Engineering Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang 3 M 2 Chalongkrung Ladkrabang Bangkok 10520 Thailand

Most of the image watermarking methods, using the properties of the human visual system (HVS), have been proposed in literature. The component of the visual threshold is usually related to either the spatial contrast sensitivity function (CSF) or the visual masking. Especially on the contrast masking, most methods have not mention to the effect near to the edge region. Since the HVS is sensitive what happens on the edge area. This paper proposes ultrasound image watermarking using the visual threshold corresponding to the HVS in which the coefficients in a DCT-block have been classified based on the texture, edge, and plain area. This classification method enables not only useful for imperceptibility when the watermark is insert into an image but also achievable a robustness of watermark detection. A comparison of the proposed method with other methods has been carried out which shown that the proposed method robusts to blockwise memoryless manipulations, and also robust against noise addition.

关键词： Image watermarking

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