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Kernel principal angles for classification machines with applications to image sequence interpretation

Kernel principal angles for classification machines with app...

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Conference on computer Vision and Pattern Recognition (CVPR)

作者： L. Wof A. Shashua Sch. of Comput. Sci. & Eng. Hebrew Univ. of Jerusalem Israel School of Computer Science and Engineering Hebrew University of Jerusalem Jerusalem Israel

We consider the problem of learning with instances defined over a space of sets of vectors. We derive a new positive definite kernel f(A, B) defined over pairs of matrices A, B based on the concept of principal angles between two linear subspaces. We show that the principal angles can be recovered using only inner-products between pairs of column vectors of the input matrices thereby allowing the original column vectors of A, B to be mapped onto arbitrarily high-dimensional feature spaces. We apply this technique to inference over image sequences applications of face recognition and irregular motion trajectory detection.

关键词： Kernel Image sequences Vectors Face detection Video sequences Engines Application software computer science Face recognition Motion detection

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Decision making in conceptual engineering design: An empirical investigation

Decision making in conceptual engineering design: An empiric...

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作者： Girod, M. Elliott, A.C. Burns, N.D. Wright, I.C. Airbus Deutschland GmbH Hamburg Germany IMPACT Research Group Department of Computer Science Loughborough University Loughborough Leicestershire United Kingdom Wolfson Sch. of Mech./Mfg. Eng. Loughborough University Loughborough Leicestershire United Kingdom School of Engineering Coventry University Coventry CV1 5FB United Kingdom

This paper describes the aims, methodology and results of an empirical research project. The aim was to gather new insight about how collaborative decision-making processes in the conceptual engineering design phase of the product development process takes place. The insight contributes to bridging the gap between the theoretical development of new decision-making methods in academia and the needs of practitioners. The researchers observed, recorded and transcribed three workshops involving groups that were engaged in the collaborative decision-making processes. Through analysing the transcripts, a set of decision-making related activities was identified. Each activity's time consumption was quantified, and a number of decision-making process models at different levels of detail were developed. During this analysis, various observations on particular process characteristics were made. It was observed that generating formal structures and documentation was beneficial to the decision-making process. This was particularly true with respect to developing problem understanding and consistency. The outcomes should be valuable for the design and development of improved decision-support systems.

关键词： Product design

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Security of digital entertainment content from creation to consumption

Security of digital entertainment content from creation to c...

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作者： Eskicioglu, Ahmet M. Town, John Delp, Edward J. Dept. of Comp./Information Science Brooklyn College City University of New York Brooklyn NY 11210 United States Technicolor P.O. Box 7427 Charlottesville VA 22906 United States Video/Image Processing Laboratory Sch. of Elec./Computer Engineering Purdue University West Lafayette IN 47907 United States

With the advent of digital technologies, many new market opportunities have emerged for content owners, content distributors, and consumer electronics/information technology industries. An essential requirement for developing a thriving marketplace is the protection of copyrighted content in digital form. There are four major stages in the delivery of content to the consumer: (1) capturing on digital media, (2) packaging, (3) distribution to home networks, and (4) transfer to the final audio/visual device within the home network. Entertainment content is of particular importance as it will be in high demand for many years to come. If an end-to-end security cannot be provided in a digital market, there would be no incentive for content creation. Lack of new supplies would result in detrimental effects for all the industries involved in the delivery chain. In this paper, we present the primary means of securing the entertainment content from creation to consumption in an attempt to understand the overall complexity of the problem. © 2003 Elsevier science B.V. All rights reserved.

关键词： Multimedia systems

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Mode coupling in coplanar waveguide bends: a simple four-port model

Mode coupling in coplanar waveguide bends: a simple four-por...

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European Conference on Microwave

作者： R. Senguttvan L. Hayden A. Weisshaar Sch. of Electr. Eng. & Comput. Sci. Oregon State Univ. Corvallis OR USA School of Electrical Engineering and Computer Science Cascade Microtech Inc. Beaverton OR USA School of Electrical Engineering and Computer Science Oregon State University Corvallis OR USA

This paper presents a novel four-port model for a 90/spl deg/ coplanar waveguide bend based on the decomposition of the waveguide into two coupled slot lines. The effect of the bend discontinuity is that of a non-uniform coupled line system due to the different slot lengths in the structure. The new model consists of uniformly coupled lines and cascaded uncoupled transmission line sections. The parameters for the coupled line system are obtained from the geometry of the bend. The modal transmission coefficients obtained with the model match well with full-wave simulations. The salient feature of the model is the simplified illustration of the frequency-dependent effects of the bend discontinuity. The occurrence of mode-conversion in the two-mode system and its effects on two-port measurements are also described.

关键词： Coplanar waveguides Transmission line discontinuities Power transmission lines Coplanar transmission lines Geometry Distributed parameter circuits Coupling circuits Computational modeling Transmission line measurements Microstrip

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An analysis of virtual private network solutions

An analysis of virtual private network solutions

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Conference on Local computer Networks (LCN)

作者： G. Rosenbaun W. Lau S. Jha Sch. of Comput. Sci. & Eng. New South Wales Univ. NSW Australia School of Computer Science and Engineering University of New South Wales Australia

VPN services have been available for decades but not widely used until recently. A combination of new VPN technologies, network technologies and business communication requirements is the driving force behind the take-up of VPN services. This paper gives an overview of recent VPN solutions and analyses their scalability and flexibility. VPN solutions are categorized and related to potential customer segments. Furthermore, measurements based on a large north-American carrier's backbone are presented. The results show that provision of a moderate number of large VPNs puts higher constraints on the provider network than a large number of moderately sized VPNs.

关键词： Virtual private networks computer networks

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110 GHz broadband measurement of permittivity on human epidermis using 1 mm coaxial probe

110 GHz broadband measurement of permittivity on human epide...

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2003 IEEE MTT-S International Microwave Symposium Digest

作者： Hwang, Hyeonseok Yim, Jounghwa Cho, Jei-Won Cheon, Changyul Kwon, Youngwoo Ctr. 3-D Millimeter-Wave Intgd. S. Sch. of Elec. Eng./Computer Science Seoul National University San 56-1 Shillim-dong Kwanak-gu Seoul 151-742 Korea Republic of Department of Electrical Engineering University of Seoul 90 Jonnong-dong Dongdaemun-ku Seoul 130-743 Korea Republic of

In this work, we have characterized permittivity of human epidermis (the epidermis: the outer skin layer) using microwave up to 110GHz. A one mm-diameter coaxial probe was adopted to increase measuring bandwidth as well as to enhance the spatial resolution. Pork was used to discriminate the permittivities between muscle tissues and fat tissues. The influence of the sample thickness was also studied. Considering several factors, the permittivity was measured on epidermis of the human palm and the wrist. In addition, a relaxation phenomenon observed in the wrist skin, revealed by Cole-Cole parameters, suggested that it originated from high water content beneath thin epidermis of the wrist skin. A relaxation phenomenon revealed by Cole-Cole parameters was observed in the wrist skin. This explains that high water content cells exist beneath thin epidermis of the wrist skin.

关键词： Dielectric relaxation

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An active rule based approach to database security in e-commerce systems using temporal constraints

An active rule based approach to database security in e-comm...

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IEEE Region 10 International Conference TENCON

作者： P. Ramasubramanian A. Kannan School of Computer Science and Engineering Anna University Chcnnai INDIA Anna University Chennai Chennai Tamil Nadu IN Sch. of Comput. Sci. & Eng. Anna Univ. India

In this paper, we present a technique that can efficiently identify anomalous accesses to the database by using an authorization rule system which has been designed for implementing a user dynamic access control system which will secure inter-operation of independently managed database services in an open, distributed environment. Traditional authorization models do not adequately meet access control requirements typical to databases, a separate authorization rule subsystem has been designed which is based on temporal event matching language (TEML). The rule specified in this security system is in event-time-condition-action (ETCA) format. XML is used for defining the authorization rules and the security rules. We could extract XML access control data from several platforms and represent the access control data for the entire enterprise through a common model. Similarly, access control data under an enterprise model can be translated to ones that are native to the platforms.

关键词： Data security Authorization Access control Distributed databases XML computer science Aging Data mining Information security Permission

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Properties of recoverable region and semi-global stabilization in recoverable region for linear systems subject to constraints

Properties of recoverable region and semi-global stabilizati...

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2003 American Control Conference

作者： Stoorvogel, Anton A. Saberi, Ali Shi, Guoyong Dept. of Math. Eindhoven Univ. of Technology Eindhoven Netherlands Dept. of Inf. Techn. Delft Univ. of Technology Delft Netherlands Sch. of Elec. Eng./Computer Science Washington State University Pullman WA 99164-2752 United States Electrical Engineering Department University of Washington Seattle WA 98195 United States

This paper investigates time-invariant linear systems subject to input and state constraints. It is shown that the recoverable region (which is the largest domain of attraction that is theoretically achievable) can be semiglobally stabilized by continuous nonlinear feedbacks while satisfying the constraints. Moreover, a reduction technique is presented which shows, when trying to compute the recoverable region, that we only need to compute the recoverable region for a system of lower dimension which generally leads to a considerable simplification in the computational effort.

关键词： Linear control systems

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Constructing sparse realisations of finite-precision digital controllers based on a closed-loop stability related measure

Constructing sparse realisations of finite-precision digital...

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作者： Wu, J. Chen, S. Li, G. Chu, J. Natl. Lab. Indust. Contr. Technol. Inst. of Advanced Process Control Zhejiang University Hangzhou 310027 China Dept. of Electron./Computer Science University of Southampton Highfield Southampton SO17 1BJ United Kingdom Sch. of Elec./Electronic Engineering Nanyang Technological University Singapore Singapore

The authors present a study of the finite word length (FWL) implementation for digital controller structures with sparseness consideration. A closed-loop stability related measure is derived, taking into account the number of trivial elements in a controller realisation. A practical design procedure is presented, which first obtains a controller realisation that maximises a lower bound of the proposed measure, and then uses a stepwise algorithm to make the realisation sparse. Simulation results show that the proposed design procedure yields computationally efficient controller realisations with an enhanced FWL closed-loop stability performance.

关键词： Digital control systems

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Sense of direction in distributed computing

Sense of direction in distributed computing

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Distributed Computing (DISC 1998)

作者： Flocchini, Paola Mans, Bernard Santoro, Nicola Sch. of Info. Technol./Engineering University of Ottawa Ottawa Ont. K1N 6N5 Canada Department of Computing Macquarie University North Ryde Sydney NSW 2109 Australia School of Computer Science Carleton University Ottawa Ont. K1S 5B6 Canada

Sense of direction is a property of labeled graphs which has been shown to have a definite impact on computability and complexity in systems of communicating entities, and whose applicability ranges from the analysis of graph classes to distributed object systems. The full consequences of this property are still not known;in fact, the ongoing investigations continue to bring new (often surprising) results, to establish unsuspected links with other research and/or application areas, and to pose more questions than they answer. The aim of this paper is to provide a view of the current status of research, describing some of the relevant results, and providing pointers to future research directions. © 2002 Published by Elsevier science B.V.

关键词： Distributed computer systems

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