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IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference

作者： Mahmood Ahmadi Stephan Wong Computer Engineering Laboratory Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technnology Netherlands

A bloom filter is a simple space-efficient randomized data structure for the representation set of items in order to support membership queries. In recent years, Bloom filters have increased in popularity in database and networking applications. In this paper, we introduce a new extension to optimize memory utilization for regular bloom filters, called bloom filter with an additional hashing function (BFAH). The regular bloom filter stores items from a set k times k memory locations that are determined by the k addresses stored in the bit-array structure. Which k addresses to utilize is determined by to which positions in the structure the k (regular) hashing functions are pointing to. Utilizing the additional hashing function, only one out of these k memory addresses is selected to store the item only once. Consequently, there is no longer needed to store the k-1 redundant copies. We implemented our approach in a software packet classifier based on tuple space search with the H3 class of universal hashing functions. Our results show that our approach is able to reduce the number of collisions when compared to a regular bloom filter.

关键词： Filters Counting circuits Data structures Distributed databases Delay Laboratories Mathematics computer science Hardware computer architecture

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Erratum: "Silicon electronics on silk as a path to bioresorbable, implantable devices" [Appl. Phys. Lett. 95, 133701 (2009)]

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Applied physics letters 2009年第26期95卷 269902页

作者： Dae-Hyeong Kim Yun-Soung Kim Jason Amsden Bruce Panilaitis David L Kaplan Fiorenzo G Omenetto Mitchell R Zakin John A Rogers 1Department of Materials Science and Engineering Beckman Institute and Frederick Seitz Materials Research Laboratory University of Illinois at Urbana-Champaign 1304 West Green Street Urbana Illinois 61801 USA 2Department of Biomedical Engineering Tufts University Medford Massachusetts 02155 USA 3Defense Advanced Research Projects Agency Arlington Virginia 22203 USA 4Department of Chemistry Department Electrical and Computer Engineering and Department Mechanical Science and Engineering University of Illinois at Urbana-Champaign 1304 West Green Street Urbana Illinois 61801 USA

[This corrects the article on p. 133701 in vol. 95.].

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Characterization of low-loss magnetodielectric composites for antenna size reduction

Characterization of low-loss magnetodielectric composites fo...

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Antennas and Propagation Society International Symposium

作者： I. Tzanidis S. Koulouridis K. Sertel D. Hansford J. L. Volakis Department of Electrical and Computer Engineering Electro Science Laboratory USA Nanotech West Laboratory Department of Biomedical Engineering Ohio State Uinversity Columbus OH USA

ISBN: (纸本)9781424420414

RF applications like antenna miniaturization, call for low-loss impedance matched materials (epsivpsila r = mupsila r ). In this paper we address the challenges in realizing these materials for antennas. After reviewing the fundamental properties of ferrimagnetics (domains, loss mechanisms) we provide measurements of their magnetic and dielectric properties. We also discuss ways for overcoming prevailing limitations associated with ferrites.

关键词： Materials Magnetic domains Permeability Ferrites Magnetic materials Perpendicular magnetic anisotropy Magnetic anisotropy

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Towards adaptive temporal planning at airports

Towards adaptive temporal planning at airports

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作者： Van Leeuwen, Pim Oei, Lian Ien Buzing, Pieter Witteveen, Cees National Aerospace Laboratory NLR Anthony Fokkerweg 2 1059 CM Amsterdam Netherlands Delft University of Technology Faculty of Electrical Engineering Mathematics and Computer Science Mekelweg 4 2628 BZ Delft Netherlands

The turnaround process at airports comprises all ground handling activities that have to be performed at aircraft during their stay at an airport. Since airports are getting more and more congested with ground handling activities, the turnaround becomes one of the most constraining factors in the airport planning process. To alleviate this bottleneck, robustness of the planning of these ground handling activities is of paramount importance. In this paper, we present a simple idea to solve a strategic temporal planning problem, like the planning of ground handling processes in a way that allows unforeseen, real-time disruptions to be handled in a straightforward and elegant manner. To that end, we apply Hunsberger's temporal decoupling algorithm to a Simple Temporal Network representation of the ground handling domain. The decoupling results in a separate planning subproblem for each of the ground handling parties involved, such that they can plan and schedule their activities independently. Whatever schedule each party will choose, the decoupling guarantees that the combined schedules are feasible. This decoupling idea can be generalized and applied to develop a more robust adaptive planning system for the turnaround process.

关键词： Multi agent systems

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Analytical carrier transport model for arbitrarily shallow p-n junctions

Analytical carrier transport model for arbitrarily shallow p...

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International Conference on Microelectronics, MIEL

作者： Milos Popadic Gianpaolo Lorito Lis K. Nanver Laboratory of Electronic ComponentsTechnology and Materials Faculty of Electrical Engineering Computer Science Delft University of Technnology Delft Netherlands

This paper presents for the first time an analytical model of arbitrarily shallow p-n junctions. Depending on the junction depth, electrical characteristics of ultra-shallow p-n junctions can vary from the characteristics of standard Schottky diodes to standard deep p-n junctions. Therefore, this model successfully unifies the standard Schottky and p-n diode expressions. In the crossover region, where the shallow doping can be totally depleted, electrical characteristics phenomenologically substantially different from typical diode characteristics are predicted. These predictions and the accuracy of the presented model are evaluated by comparison with the MEDICI simulations. Furthermore, ultra-shallow n+-p diodes were fabricated, and the anomalous behavior in the crossover regime was experimentally observed.

关键词： Analytical models P-n junctions Schottky diodes Semiconductor process modeling Schottky barriers Equations Electric variables Doping Predictive models Medical simulation

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On the selection of the cost function for gradient-based decomposition of surface electromyograms

On the selection of the cost function for gradient-based dec...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： A. Holobar D. Zazula Laboratory of Engineering of Neuromuscular System and Motor Rehabilitation Politecnico di Turino Torino Italy Faculty of Electrical Engineering and Computer Science University of Maribor Maribor Slovenia

Recently, gradient Convolution Kernel Compensation method was introduced for blind assessment of sparse pulse sequences (PS) out of their convolutive mixtures. This method employs multichannel recordings, is fully automatic and is minimally biased by assumptions about underlying mixing process. In the first step, the unknown mixing channels (convolution kernels) are compensated, whereas in the second step the gradient algorithm is used to blindly optimize the estimated PSs. This paper discusses the selection of the cost functions for aforementioned gradient-based optimization and provides analytical framework for their mutual comparison. Theoretical derivations are validated on both synthetic signals with random mixing matrices and experimental surface electromyograms from abductor pollicis brevis muscle. The analytical derivations agree very well with the results obtained from numerical simulations and establish theoretical guidelines for developing new gradient-based decomposition methods.

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Improvements of using the WOMN System in Communication

Improvements of using the WOMN System in Communication

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International Symposium on High Capacity Optical Networks and Enabling Technologies, HONET

作者： Mohammad G. Ali Wail Mardini Yaser Khamayseh Akbar Ghaffar Pour Rahbar Computer Science Department Faculty of Computer and Information Technology Jordan University of Science and Technology Irbid Jordan Computer Networks Research Laboratory Department of Electrical Engineering Sahand University of Technology Tabriz Iran

The increasing demand of various networking applications such as Internet, voice, data, video and TV services inside large cities with large population requires the design and implementation of more effective metropolitan networks. Currently, several wireless networking systems were established to provide such services. Two main fixed broadband access network were used for such services: Local Multipoint Distribution Service (LMDS) and Multi-channel Multipoint Distribution Service (MMDS). Both of these systems face several problems such as: high cost, relatively low speed, small coverage area, and last-mile bottleneck. The effect of the above mentioned problems are more obvious when the network size increases. The deployment of a new technology by using Wireless Optical Mesh Network (WOMN), which use wireless optical communications between nodes, can overcome these problems and can provide more bandwidth, interference-free, frequency-free and more effectiveness in applications that require a real time responding like video surveillance. We investigate the WOMN advantages and disadvantages. We also discuss the commercial, geographical coverage and real time applicability. We will also investigate the challenges to deploy the new technique for local and metropolitan networks between different city buildings.

关键词： Cities and towns IP networks Web and internet services TV Costs Optical fiber networks Mesh networks Wireless communication Optical fiber communication Bandwidth

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Comparison of Speaker Segmentation Methods Based on the Bayesian Information Criterion and Adapted Gaussian Mixture Models

Comparison of Speaker Segmentation Methods Based on the Baye...

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International Conference on Systems, Signals and Image Processing

作者： Matej Grasic Marko Kos Andrej Zgank Zdravko Kacic University of Maribor Faculty of Electrical Engineering and Computer Science Laboratory for Digital Signal Processing Smetanova ul. 17 SI-2000 Maribor Slovenia

ISBN: (纸本)9788022728560

This paper addresses the topic of unsupervised speaker segmentation for automatic speech recognition in a complex real life environment like broadcast news domain. A statistical approach where a Universal Background Model (UBM) is applied for online speaker segmentation was compared with the widely used Bayesian Information Criterion (BIC) approach. An analysis of influence of different window selection strategies on performance of both methods was carried out. Experiments and test evaluation were performed on the Slovenian BNSI Broadcast News speech database.

关键词： Bayesian Information Criterion (BIC) Speaker segmentation Gaussian Mixture Models (GMM) Broadcast news

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Speech Bandwidth Classification for Broadcast News Domain Using Artificial Neural Network and Gaussian Mixture Models

Speech Bandwidth Classification for Broadcast News Domain Us...

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International Conference on Systems, Signals and Image Processing

作者： Marko Kos Matej Grasic Bojan Kotnik Zdravko Kacic University of Maribor Faculty of Electrical Engineering and Computer Science Laboratory for Digital Signal Processing Smetanova ul. 17 SI-2000 Maribor Slovenia

ISBN: (纸本)9788022728560

In this paper we present research work that was carried out on Slovenian BNSI Broadcast News database regarding the speech bandwidth classification. Speech recorded in studio environment has frequency bandwidth of 8kHz, while speech recorded over telephone channel has the bandwidth of 3.1kHz. Speech bandwidth classification enables us to use separate speech models for automatic speech recognition (ASR), which helps to improve the overall automatic speech recognition result. For the task of speech bandwidth classification we used two different model-based principles. One principle is based on artificial neural network and the second principle is based on Gaussian mixture models. Both principles have been tested and evaluated using same front-end features for simple result comparison.

关键词： Classification Bandwidth Artificial neural networks Gaussian mixture models Broadcast news Artificial neural networks Bandwidth Speech Mixture models Speech recognition frequency band widths Taxonomy news

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Correlation between optical coherence tomography (OCT) and optical intrinsic signal imaging (OISI) during functional brain activation

Correlation between optical coherence tomography (OCT) and o...

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biomedical Optics, BIOMED 2008

作者： Chen, Y. Aguirre, A.D. Ruvinskaya, L. Devor, A. Boas, D.A. Fujimoto, J.G. Department of Electrical Engineering Computer Science and Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA 02139 United States Harvard-MIT Division of Health Sciences and Technology Cambridge MA United States Martinos Center for Biomedical Imaging Department of Radiology Massachusetts General Hospital Harvard Medical School Charlestown MA 02129 United States

Simultaneous OCT and OISI were performed on rat somatosensory cortex during forepaw stimulation. The depth-integrated OCT signal correlates well with OISI signal, while OCT resolves layer-specific dynamics in function... 详细信息

关键词： Optical tomography

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