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Spherical embeddings for non-Euclidean dissimilarities

Spherical embeddings for non-Euclidean dissimilarities

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Conference on computer Vision and Pattern Recognition (CVPR)

作者： Richard C. Wilson Edwin R. Hancock Elżbieta Pękalska Robert P. W. Duin Department of Computer Science University of York UK School of Computer Science University of Manchester Institute of Science and Technology UK Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technnology Netherlands

Many computer vision and pattern recognition problems may be posed by defining a way of measuring dissimilarities between patterns. For many types of data, these dissimilarities are not Euclidean, and may not be metric. In this paper, we provide a means of embedding such data. We aim to embed the data on a hypersphere whose radius of curvature is determined by the dissimilarity data. The hypersphere can be either of positive curvature (elliptic) or of negative curvature (hyperbolic). We give an efficient method for solving the elliptic and hyperbolic embedding problems on symmetric dissimilarity data. This method gives the radius of curvature and a method for approximating the objects as points on a hyperspherical manifold. We apply our method to a variety of data including shape-similarities, graph-similarity and gesture-similarity data. In each case the embedding maintains the local structure of the data while placing the points in a metric space.

关键词： Eigenvalues and eigenfunctions computer science computer vision Pattern recognition Extraterrestrial measurements Shape measurement Mathematics Electric variables measurement Character recognition Multidimensional systems

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Design and simulation of flow cell chamber for quartz crystal microbalance sensor array

Design and simulation of flow cell chamber for quartz crysta...

引用

International Conference on electrical engineering/Electronics, computer, Telecommunications and Information technology, ECTI-CON

作者： Kata Jaruwongrungsee Thitima Maturos Pornpimol Sritongkum Anurat Wisitsora-at Chuchart Pintavirooj Manas Sangworasil Adisorn Tuantranont Department of Electrical Engineering Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang (KMITL) Ladkrabang Thailand Nanoelectronics and MEMS Laboratory National Electronics and Computer Technology Center Pathum Thani Thailand Department of Telecommunications Engineering Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang (KMITL) Ladkrabang Thailand

ISBN: (纸本)9781424456062;9789746724913

In this paper, the cause of significant variation in sensing responses of identical QCM sensors array in a circular QCM chamber is analyzed by fluid dynamic simulation. Moreover, the simulation is used to determine an appropriate shape of flow chamber for QCM sensor array. Simulation results show that the flow in a circular-shaped QCM chamber design is primarily turbulent. In addition, the degree of turbulence is increased with flow rate. Thus, sensors at various locations see different sample dispersions causing their sensing behaviors to be significantly different. The QCM chamber has been redesigned to be rectangular line and simulation results indicate that it can be the solution to the problem because flow in the new design is primarily laminar with uniform sample velocity.

关键词： Sensor arrays Biosensors Electrodes Frequency Sensor phenomena and characterization Sputtering Gold Chemical and biological sensors Temperature sensors Chromium

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Optimal design of a single-input parallel DC-DC Converter designed by switched capacitor techniques

Optimal design of a single-input parallel DC-DC Converter de...

引用

作者： Eguchi, Kei Pongswatd, Sawai Tirasesth, Kitti Sasaki, Hirofumi Inoue, Takahiro Department of Technology Education Shizuoka University 836 Ohya Suruga-ku Shizuoka 422-8529 Japan Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang Ladkrabang Bangkok 10525 Thailand School of Industrial Engineering Tokai University 9-1-1 Toroku Kumamoto-shi Kumamoto 862-8652 Japan Department of Electrical and Computer Engineering Kumamoto University 2-40-1 Kurokami Kumamoto 860-8555 Japan

In the design of parallel-connected power converters, theoretical analysis to clarify the influence of process fluctuation is important, because the characteristic of a converter which consists of many circuit components is strongly influenced by the fluctua-tion of those components. Concerning parallel-connected switched-capacitor (SC) DC-DC converters, 1. the optimal setting of a duty factor to achieve best efficiency and 2. the change in characteristics caused by fluctuation of circuit components are analyzed in this paper. The validity of the theoretical analyses is confirmed by SPICE simulations and experiments. The results of this study are as follows: 1. The optimal setting of duty fac-tor D can be derived by the proposed theoretical formulas, because the theoretical results correspond well with the simulated results. 2. The fluctuation of on-resistances affects power efficiency in proportion to the decrease of output load RL. The value of the total SC resistance is important in power efficiency η, for example, an increase of 20 % in the total SC resistance causes a decrease of 2.2 % in efficiency when RL = 5ω. 3. When fluctuation of input voltages is caused, the influence on power efficiency η increases ac-cording to output load R L. 4. In the case of the fluctuation of capacitance, the influence of ripple factor R depends on fluctuating directions of capacitances. © 2010 ISSN.

关键词： DC-DC converters

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Event-based motion coordination of multiple underwater vehicles under disturbances

Event-based motion coordination of multiple underwater vehic...

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OCEANS - Europe

作者： Pedro V. Teixeira Dimos V. Dimarogonas Karl H. Johansson João Sousa Underwater Systems and Technologies Laboratory Electrical and Computer Engineering Department Faculty of Engineering University of Porta Porto Portugal Laboratory of Information and Decision Systems Massachusetts Institute of Technology Cambridge MA USA KTH ACCESS Linnaeus Center School of Electrical Engineering Royal Institute of Technology Stockholm Sweden

The problem of driving a formation from an initial to a target configuration while under the effect of external disturbances is studied. Additional restrictions on agent sensing as well as inter-agent communication must be satisfied. We present a leader-follower solution that relies on a simple uncertainty model to trigger surfacing events. These events are then used to update the control signal, for which two different, provably correct, control strategies are proposed. Finally, we show how the surfacing events can be used to characterize the disturbance set. Numerical examples on relevant scenarios are also provided.

关键词： Uncertainty Lead Trajectory Upper bound Position measurement Vehicles Ellipsoids

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Size effect of the ground plane and axial coupling aperture on the monopole antenna performance

Size effect of the ground plane and axial coupling aperture ...

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2010 International Kharkov Symposium on Physics and engineering of Microwaves, Millimeter and Submillimeter Waves, MSMW'2010

作者： Khruslov, M.M. Ivanchenko, I.V. Ligthart, L.P. Korolev, A.M. Pazynin, V.L. Popenko, N.A. Usikov Institute for Radiophysics and Electronics NAS of Ukraine 12 Proskura st. Kharkov 61085 Ukraine Faculty of Electrical Engineering Mathematics and Computer Science International Research Centre for Telecommunications and Radar Delft University of Technology Mekelweg 4 2628 GA Delft Netherlands Institute of Radioastronomy NAS of Ukraine 4 Krasnoznamennaya st. 61002 Kharkov Ukraine

ISBN: (纸本)9781424478996

Our systematic and detailed investigations of the X-band cylindrical monopole antennas allowed us to clarify the physical nature of oscillating dependencies of antenna characteristics such as the resonance frequency, elevation angle, and gain for the quarter-wavelength monopole. For the first time we have demonstrated the role of the finite ground plane and the axial coupling aperture on the cylindrical monopole antennas performance. In contrast to the quarter-wavelength monopole the radiation of the grounded three quarter-wavelength monopole is formed at the angle near zenith thereby diminishing the edge effects. The optimal radii of the axial coupling aperture providing the maximum antenna efficiency have been determined for all the AUT's. Furthermore, it has been shown that the axial coupling aperture radius variation is accompanied by the resonance frequency shift of the antenna. The quarter-wavelength monopole antenna with the best characteristics and permissible minimal ground plane radius R=/4 demonstrating the mono-beam radiation pattern, 10dB impedance bandwidth of 1.6GHz, and the gain G=4dBi has been presented. © 2010 IEEE.

关键词： Monopole antennas

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Observability and Controllability Verification in Multi-Agent Systems through Decentralized Laplacian Spectrum Estimation

Observability and Controllability Verification in Multi-Agen...

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2010 49th IEEE Conference on Decision and Control

作者： Mauro Franceschelli Simone Martini Magnus Egerstedt Antonio Bicchi Alessandro Giua Dept. of Electrical and Electronic Engineering University of Cagliari Italy Interdepartmental Research Center "E.Piaggio" Faculty of Engineering - University of Pisa Dept. of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA

ISBN: (纸本)9781424477456

In this paper we show how the decentralized estimation of the spectrum of a network can be used to infer its controllability and observability properties. The proposed approach is applied to networked multi-agent systems whose local interaction rule is based on Laplacian feedback. We provide a decentralized necessary and sufficient condition for observability and controllability based on the estimated eigenvalues. Furthermore we show an example of application of the proposed method and show that the estimated spectrum can also be envisioned as a tool for decentralized formation identification.

关键词： Observability controllability Decentralized Sufficient conditions Spectrum Analysis Laplacian operator Spectra

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Novel parallel array imprinting of nano-photonic structures on optical fibre facets

Novel parallel array imprinting of nano-photonic structures ...

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OptoElectronics and Communications Conference, OECC

作者： Gorgi Kostovski Udayakumar Chinnasamy Sasani Jayawardhana Paul R. Stoddart Arnan Mitchell Platform Technologies Research Institute School of Electrical and Computer Engineering RMIT University Melbourne VIC Australia Faculty of Engineering and Industrial Science Swinburne University of Technology Hawthorn VIC Australia

A new technique for parallel imprinting of multiple optical-fibre facets is presented. Resolution of better than 15nm is demonstrated and up to 40 optical-fibres have been imprinted in parallel. A compact, portable im... 详细信息

关键词： Optical fibers Arrays Optical scattering Nanostructures Biomedical optical imaging Optical diffraction

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A conformable microelectrode array (cMEA) with integrated electronics for peripheral nerve interfacing

A conformable microelectrode array (cMEA) with integrated el...

引用

IEEE Biomedical Circuits and Systems (BIOCAS)

作者： Liang Guo Isaac P. Clements Dustin Li Ravi V. Bellamkonda Stephen P. DeWeerth Wallace H. Coulter Department of Biomedical Engineering Georgia Institute of Technology Atlanta GA USA School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA Faculty of the Wallace H. Coulter Department of Biomedical Engineering Georgia Institute of Technology Atlanta GA USA

A high-resolution PDMS-based conformable microelectrode array (cMEA) with integrated electronics is implemented. The cMEA is incorporated into individual layers of a nanofiber-based nerve regeneration scaffold to create a novel regenerative electrode scaffold (RES) capable of establishing a stable, high-resolution peripheral nerve interface. The device features a compact size with an enhanced signal-to-noise ratio (SNR), as required by implantation applications. Preliminary characterizations of the device are performed using in vitro experimentations, including impedance spectroscopy and neural culturing.

关键词： Fabrication Impedance Microelectrodes Arrays Wires Substrates

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Roadside Units Deployment for Efficient Short-Time Certificate Updating in VANETs

Roadside Units Deployment for Efficient Short-Time Certifica...

引用

IEEE International Conference on Communications (ICC)

作者： Y. Sun X. Lin R. Lu X. Shen J. Su School of Computer Science National University of Defense Technology Changsha Hunan China Department of Electrical and Computer Engineering University of Waterloo Waterloo ONT Canada Faculty of Business and Information Technology University of Ontario Institute of Technology (UOIT) Oshawa Canada

Roadside Units (RSUs) aided distributed certificate service is a promising approach for ensuring security and privacy preservation in vehicular ad hoc networks (VANETs), where the existence of RSUs is critical for such a scheme in order to allow On-Board Units (OBUs) to update their short-time certificates on time. However, RSUs may only be deployed at some critical points along roads due to the cost. In this paper, we propose a cost-efficient RSUs deployment scheme to guarantee that OBUs at any place could communicate with RSUs in certain driving time (DT), and the extra overhead time (ET) of adjusting routes to update short-time certificate is small. Based on a real-world map, several deployment examples are given illustrating the influence of key factors in RSUs deployment such as wireless communication range, DT and ET. Furthermore, extensive analysis demonstrates that our RSUs deployment scheme can meet the required design goals.

关键词： Privacy Information security Ad hoc networks Costs Wireless communication Vehicles Authentication Communications Society computer science Paper technology

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Power transformers behavior under the occurrence of inrush currents and turn-to-turn winding insulation faults

Power transformers behavior under the occurrence of inrush c...

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International Conference on electrical Machines, ICEM

作者： Luís M. R. Oliveira A. J. Marques Cardoso High Institute of Engineering University of Algarve Faro Portugal Instituto de Telecommunicações Coimbra Portugal Department of Electrical and Computer Engineering Faculty of Sciences and Technology University of Coimbra Coimbra Portugal

This paper intends to provide a detailed characterization of the transformer behavior under the influence of inrush currents and/or incipient winding faults. Experimental and simulation results are presented and discussed. Finally, a promising new method to identify inrush currents, and to distinguish them from internal faults, is suggested.

关键词： Windings Circuit faults Harmonic analysis Power transformer insulation Surges Surge protection

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