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Tunable ferrite based triple-band μ-negative metamaterial

Tunable ferrite based triple-band μ-negative metamaterial

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Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Haibin Sun Guangjun Wen Yongjun Huang Jingping Zhong Weiren Zhu Key Laboratory of Broadband Optical Fiber Transmission & Communication Networks School of Communication and Information Engineering University of Electronic Science and Technology Chengdu China Advanced Computing and Simulation Laboratory (AxL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia

We present a tunable triple-band μ-negative metamaterial composed of loop resonator and ferrite. The tunable triple-band-stop transmission spectrum of such metamaterial is investigated numerically by full wave simulations. Moreover, the corresponding effective parameters are retrieved to illustrate the tunable μ-negative characteristic.

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Determination of the effective constitutive parameters of active transmission line metamaterials

Determination of the effective constitutive parameters of ac...

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International Workshop on Metamaterials

作者： Li-Ming Si Weiren Zhu Xin Lv Beijing Key Laboratory of Millimeter Wave and Terahertz Technology Department of Electronic Engineering School of Information and Electronics Beijing Institute of Technology Beijing China Advanced Computing and Simulation Laboratory (AxL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia

This paper presents an alternative approach, based on the transmission line theory, for determination of the attenuation constant (α), phase constant (β), characteristic impedance (Zo), refractive index (n), effective permittivity (ε) and effective permeability (μ) for active transmission line (TL) metamaterial. When active elements are introduced into the lossy TL meta-material, the gain acquired from the active elements should be evaluated quantitatively against the attenuation due to the loss in order to avoid ambiguities in determining the signs of the effective constitutive parameters. In stead of directly determining the characteristic impedance from S-parameters, we introduce the reflection coefficient as an intermediate quantity to assist solving the characteristic impedance. This paper shows demonstration of this method with an example of active TL metamaterial.

关键词： Metamaterials Impedance Refractive index Attenuation Magnetic materials Permeability

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Collaborative relay beamforming based on the worst-case SINR for multiuser in cellular systems

Collaborative relay beamforming based on the worst-case SINR...

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Asia-Pacific Conference on Communications

作者： Da Wang Lin Bai Chen Chen Ye Jin Jinho Choi State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University Beijing China School of Electronic and Information Engineering Beihang University Beijing China School of Engineering Swansea University Swansea UK

ISBN: (纸本)9781467347266

Recently collaborative relay systems have been studied to increase the spectral efficiency and extend the range of wireless communications. In this paper, we consider the collaborative relay beamforming (CRBF) for multiuser systems. In the proposed method, we select base station (BS) antennas for each user and optimize their CRBF weights under two different types of power constraints, which are the total relay power constraint and individual relay power constraints, by exploiting the notion of the maximization of the worst-case received signal-to-interference-and-noise ratio (SINR). The optimization problem of the CRBF weights can be efficiently solved using a semidefinite relaxation (SDR) *** derive an iterative CRBF scheme to jointly select the BS antennas and optimize the CRBF weights to maximize the worst SINR among all users. Simulation results validate our theoretical analysis and demonstrate the tradeoffs between the number of BS antennas and the number of relays in the CRBF system.

关键词： Relays Signal to noise ratio Interference Antennas Vectors Array signal processing Collaboration

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An optimal sensor deployment scheme to ensure multi level coverage and connectivity in wireless sensor networks

An optimal sensor deployment scheme to ensure multi level co...

引用

International Wireless Communications and Mobile Computing Conference, IWCMC

作者： Arnab Raha Shovan Maity Mrinal Kanti Naskar Omar Alfandi Dieter Hogrefe Department of Electronics and Telecommunication Engineering Advanced Digital and Embedded Systems Laboratory Jadavpur University Kolkata India Institute of Computer Science SensorLab Telematics Group Georg-August-University of Goettingen Gottingen Germany

This paper introduces an optimal deployment algorithm of sensors in a given region to provide desired coverage and connectivity for a wireless sensor network. Our paper utilizes two separate procedures for covering different regions of a symmetrical rectangular area. The proposed method divides the given area of interest into two distinct sub-regions termed as the central and edge regions. In each region, a unique scheme is used to determine the number and location of sensors required to monitor and completely cover the region keeping the connectivity and coverage ranges of the sensors, their hardware specification and the dimensions of the region concerned as the constraints. Our scheme reduces the overhead in determining the position of sensors for deployment by following a coverage and connectivity algorithm of lesser complexity rather than those present in related schemes. Finally, we compare our deployment scheme with the interpolation scheme of [2] in regions of different dimensions and different coverage and connectivity levels with different sensing ranges of the sensors to show our cost efficiency over the latter.

关键词： Wireless sensor networks Sensors Interpolation Reliability Strips Optimization Protocols

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Distributed polite water-filling for optimization of MIMO B-MAC interference networks

Distributed polite water-filling for optimization of MIMO B-...

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Asia-Pacific Conference on Communications

作者： An Liu Youjian Liu Vincent K. N. Lau Haige Xiang Wu Luo Department of Electronic and Computer Engineering Hong Kong University of Science and Technology University of Colorado Boulder Boulder CO US State Key Laboratory of Advanced Optical Communication Systems& Networks Peking University

It is often impractical to obtain global channel knowledge and conduct centralized optimization for wireless networks. We study distributed weighted sum-rate maximization (WSRM) in general MIMO interference networks, named B-MAC interference networks. It is desirable to exploit the structure of the problem to design distributed algorithms with high performance and low signaling overhead. We recently unveiled a polite water-filling (PWF) structure satisfied by all Pareto optimal inputs of important achievable regions of the B-MAC interference networks. The PWF offers an elegant method to decompose a network into multiple equivalent single user channels and thus, facilitates the design of distributed algorithms. Based on the PWF, we design efficient distributed algorithms which only need local channel knowledge and converge to a stationary point of the WSRM problem. For TDD networks, the duality inherited in PWF and the channel reciprocity are further exploited to reduce the signaling overhead. The proposed algorithms are shown by simulations to outperform the state-of-the-art.

关键词： Training Interference Covariance matrix Transmitters Receivers Distributed algorithms Channel estimation

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Electrodeless-discharge-vapor-lamp-based optical atomic filter

Electrodeless-discharge-vapor-lamp-based optical atomic filt...

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IEEE International Frequency Control Symposium

作者： Qinqing Sun Yelong Hong Xiaobo Xue Zhiming Tao Wei Zhuang Jingbiao Chen Zhiwen Liu State Key Laboratory of Advanced Optical Communication Systems and Networks and Institute of Quantum Electronics School of Electronics Engineering & Computer Science Peking University Beijing China Department of Electrical Engineering The Pennsylvania State University University Park PA USA

ISBN: (纸本)9781457718212

An excited-state Faraday anomalous dispersion optical filter (FADOF) has been demonstrated, which utilizes a rubidium electrodeless-discharge-vapor-lamp rather than an external pump laser. When the lamp is turned off, the lamp-based filter can be treated as a ground-state FADOF. The compact lamp based FADOF holds promise for realing a frequency-fixed diode laser systems (such as a 1529 nm laser for optical communication application) and a multi-frequency filters.

关键词： Optical filters Laser excitation Pump lasers Optimized production technology Dispersion Atomic beams Semiconductor lasers

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1.53µm electroluminescence of erbium excited by hot carriers in ErRE (RE=Yb, Y) silicates

1.53µm electroluminescence of erbium excited by hot carrier...

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IEEE International Conference on Group IV Photonics

作者： Bing Wang Ruimin Guo Lei Wang Xingjun Wang Zhiping Zhou State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University Beijing China Division of Biological Energy and Environmental Measurement National Institute of Metrology Beijing China

We investigated the 1.53μm electroluminescence of erbium excited by hot carriers in ErRE (RE=Yb, Y) silicate metal-insulator-silicon light emitting devices. Intense 1.53μm light emissions and large Er 3+ impact exc... 详细信息

关键词： Erbium Hot carriers Optical waveguides Films Current measurement Tunneling Electroluminescence

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Single camera-based full depth map estimation using color shifting property of a multiple color-filter aperture

Single camera-based full depth map estimation using color sh...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Seungwon Lee Junghyun Lee Monson H. Hayes Aggelos K. Katsaggelos Joonki Paik Image Processing and Intelligent Systems Laboratory Graduate School of Advanced Imaging Science Multimedia and Film Chung-Ang University Seoul South Korea Department of Electrical Engineering and Computer Science Northwestern University Evanston IL USA

A multiple color-filter aperture (MCA) camera can provide depth information as well as color and intensity in the single-camera framework, where the MCA generates misalignment between color channels depending on the distance of a region-of-interest. In this paper, we present a single camera-based estimation of the full depth map using the color shifting property of the MCA. For estimating the color shifting vectors (CSVs) among red, green, and blue color channels, edges are extracted at each color channel. At the edge, we estimate CSVs using normalized cross correlation combined with color shifting mask map. A full depth map is then generated by depth interpolation using the matting Laplacian method from sparsely estimated CSVs at an edge location. Experimental results show that the proposed method can not only estimate the full depth map but also correct the misaligned color image to generate photorealistic color images using a single camera equipped with MCA.

关键词： Image color analysis Cameras Estimation Channel estimation Image edge detection Interpolation Apertures

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Analysis, modeling, and simulation of autonomous microgrids with a high penetration of renewables

Analysis, modeling, and simulation of autonomous microgrids ...

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IEEE General Meeting Power& Energy Society

作者： Anthony M. Giacomoni Steven Y. Goldsmith S. Massoud Amin Bruce F. Wollenberg Electrical and Computer Engineering Department University of Minnesota Minneapolis MN USA Technological Leadership Institute University of Minnesota Minneapolis MN USA Advanced Information Systems Laboratory Sandia National Laboratories Albuquerque NM USA Technological Leadership Institute and the Electrical and Computer Engineering Department University of Minnesota Minneapolis MN USA

Autonomous microgrids are operated and coordinated by intelligent automatic controls without any reliance on human intervention. In this paper, a simulation framework utilizing sequential Monte Carlo simulations is developed to investigate the performance of autonomous microgrids that have the ability to interconnect to achieve adequate load service. Detailed models of the various microgrid components and interconnection policies implemented are provided. In order to minimize the exposure of each microgrid to vulnerabilities, it is also desired that the number of interconnections be minimal. Using the developed framework, various simulation scenarios are explored. Results show the impact of storage capacity, intermittent distributed energy resources (DERs), and the ability to interconnect occasionally with other microgrids on each microgrid's security and reliability as measured using standard risk indices.

关键词： Assembly Generators Load modeling Wind turbines Maintenance engineering Numerical models

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Reports of the AAAI 2011 conference workshops

Reports of the AAAI 2011 conference workshops

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作者： Agmon, Noa Agrawal, Vikas Aha, David W. Aloimonos, Yiannis Buckley, Donagh Doshi, Prashant Geib, Christopher Grasso, Floriana Green, Nancy Johnston, Benjamin Kaliski, Burt Kiekintveld, Christopher Law, Edith Lieberman, Henry Mengshoel, Ole J. Metzler, Ted Modayil, Joseph Oard, Douglas W. Onder, Nilufer O'Sullivan, Barry Pastra, Katerina Precup, Doina Ramachandran, Sowmya Reed, Chris Sariel-Talay, Sanem Selker, Ted Shastri, Lokendra Singh, Satinder Smith, Stephen F. Srivastava, Siddharth Sukthankar, Gita Uthus, David C. Williams, Mary-Anne Department of Computer Science University of Texas at Austin United States Center for Knowledge Driven Information Systems Infosys Labs India Adaptive Systems Section Naval Research Laboratory Washington DC United States Department of Computer Science University of Maryland College Park United States EMC's Center of Excellence in Ireland Research Europe at EMC Ireland Department of Computer Science University of Georgia United States School of Informatics University of Edinburgh United Kingdom Department of Computer Science University of Liverpool United Kingdom Department of Computer Science University of North Carolina Greensboro United States Faculty of Engineering and Information Technology University of Technology Sydney Australia VeriSign Inc. United States Department of Computer Science University of Texas at El Paso United States Machine Learning Department Carnegie Mellon University United States Massachusetts Institute of Technology Media Laboratory United States Carnegie Mellon University's Silicon Valley Campus United States Darrell W. Hughes Program for Religion and Science Dialogue Oklahoma City University United States Department of Computing Science University of Alberta Canada College of Information Studies Institute for Advanced Computer Studies University of Maryland College Park United States Department of Computer Science Michigan Technological University United States Department of Computer Science University College Cork Ireland Cognitive Systems Research Insitute Athens Greece School of Computer Science McGill University Canada Stottler Henke Inc. United States School of Computing University of Dundee United Kingdom Department of Computer Engineering Istanbul Technical University Turkey Convergence Lab Infosys Technologies Ltd. United States Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor United States Robotics Institute Carnegie Mellon University United States University of Wisconsin

The AAAI-11 workshop program was held Sunday and Monday, August 7-18, 2011, at the Hyatt Regency San Francisco in San Francisco, California USA. The AAAI-11 workshop program included 15 workshops covering a wide range of topics in artificial intelligence. The titles of the workshops were Activity Context Representation: Techniques and Languages;Analyzing Microtext;Applied Adversarial Reasoning and Risk Modeling;Artificial Intelligence and Smarter Living: The Conquest of Complexity;Artifiicial Intelligence for Data Center Management and Cloud Computing;Automated Action Planning for Autonomous Mobile Robots;Computational Models of Natural Argument;Generalized Planning;Human Computation;Human-Robot Interaction in Elder Care;Interactive Decision Theory and Game Theory, 2010;Language-Action Tools for Cognitive Artificial Agents: Integrating Vision, Action, and Language;Lifelong Learning from Sensorimotor Experience;Plan, Activity, and Intent Recognition;and Scalable Integration of Analytics and Visualization. This article presents short summaries of those events. Copyright © 2012, Association for the Advancement of Artificial Intelligence. All rights reserved.

关键词： Human robot interaction

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