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Creative Education 2015年第13期6卷 1456-1465页

作者： Junia Rocha Alexsandro Soares Mauro Honorato Luciano Lima Nayara Costa Elvio Moreira Eduardo Costa Department of Informatics Federal Institute of Triangulo Mineiro Patos de Minas Brazil Department of Computer Science Federal University of Uberlandia Uberlandia Brazil Department of Informatics Federal Institute of Sao Paulo Barretos Brazil Department of Electrical Engineering Federal University of Uberlandia Uberlandia Brazil Department of Education Federal University of Uberlandia Uberlandia Brazil

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An approach to ultra-wideband channel calibration using a vector network analyser

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Australian Journal of electrical and Electronics engineering 2014年第4期11卷 347-356页

作者： Alshabo, A. Stirling, D. Ros, M. Vial, P.J. Wysocki, B. Wysocki, T. School of Electrical Computer and Telecommunications Engineering Faculty of Informatics University of Wollongong WollongongNSW Australia University of Nebraska-Lincoln LincolnNE United States

In this paper, two calibration methods are investigated to determine the most suitable approach for ultra-wideband (UWB) communication channel measurements. The first method is the through, open, short and match (TOSM) calibration technique. The second method is through, reflection and load calibration technique. Presented experiment results show that the through, reflection and load calibration process is more precise for calibration of coaxial cables and the UWB channel as clearly seen by increased magnitudes of the channel transfer function. It is also shown that the proposed through, reflection and load technique leads to an improved larger measured root-mean-square value and that the measured magnitude transfer function of the wireless channel is increased by an absolute value of approximately 5 dB after calibration compared with results achieved when TOSM technique is used. In the paper, it is also shown that the time delay associated with test equipment of the UWB channel measurement can be equally well removed by using either the through, reflection and load or TOSM calibration techniques. © Institution of Engineers Australia, 2014.

关键词： Calibration

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Learning k-modal distributions via testing

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Theory of Computing 2014年 10卷 535-570页

作者： Daskalakis, Constantinos Diakonikolas, Ilias Servedio, Rocco A. Department of Electrical Engineering and Computer Science Massachussetts Institute of Technology United States School of Informatics University of Edinburgh United Kingdom Department of Computer Science Columbia University United States

A k-modal probability distribution over the discrete domain {1;……,n} is one whose histogram has at most k "peaks" and "valleys." Such distributions are natural generalizations of monotone (k = 0) and unimodal (k = 1) probability distributions, which have been intensively studied in probability theory and statistics. In this paper we consider the problem of learning (i. e., performing density estimation of) an unknown k-modal distribution with respect to the L1 distance. The learning algorithm is given access to independent samples drawn from an unknown k-modal distribution p, and it must output a hypothesis distribution bp such that with high probability the total variation distance between p and bp is at most e. Our main goal is to obtain computationally efficient algorithms for this problem that use (close to) an information-theoretically optimal number of samples. We give an efficient algorithm for this problem that runs in time poly(k;log(n),1/Ε). For k ≤ Õ(logn), the number of samples used by our algorithm is very close (within an Õ(log(1/Ε) factor) to being information-theoretically optimal. Prior to this work computationally efficient algorithms were known only for the cases k = 0;1 (Birgé 1987, 1997). A novel feature of our approach is that our learning algorithm crucially uses a new algorithm for property testing of probability distributions as a key subroutine. The learning algorithm uses the property tester to efficiently decompose the k-modal distribution into k (near-)monotone distributions, which are easier to learn. © 2014 Constantinos Daskalakis, Ilias Diakonikolas, and Rocco A. Servedio.

关键词： Probability distributions

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Applying hard and fuzzy K-modes clustering for dynamic Web recommendations

Applying hard and fuzzy K-modes clustering for dynamic Web r...

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作者： Christodoulou, Panayiotis Lestas, Marios Andreou, Andreas S Department of Electrical Engineering / Computer Engineering and Informatics Cyprus University of Technology Cyprus Department of Electrical Engineering Frederick University of Cyprus Cyprus

This paper proposes a dynamic Recommender System for the Web, which uses Entropy based Hard and Fuzzy K-modes algorithms to group items in clusters according to certain data features. Recommendations are then produced from those clusters that have their centers closer to the user's search preferences. The system starts operating with a learning session which allows the user to conduct various searches in order to identify her/his initial preferences. The ongoing searching behavior of the user is dynamically recorded and inserted in the recommendation engine, adjusting user preferences in real-time and enabling the system to maintain high levels of accuracy. The proposed approach is validated on a movie dataset containing information on stars, categories and production companies, with the user being able to search for an item based on one or more of these features. The results indicate successful performance for the two clustering algorithms, while a short comparison to variations of the KNN algorithm suggests superiority of the proposed approaches. © 2014 CRL Publishing Ltd.

关键词： Entropy

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Designing Efficient Elliptic Curve Diffie-Hellman Accelerators for Embedded Systems

Designing Efficient Elliptic Curve Diffie-Hellman Accelerato...

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IEEE International Symposium on Circuits and Systems

作者： Apostolos P. Fournaris Ioannis Zafeirakis Christos Koulamas Nicolas Sklavos Odysseas Koufopavlou Industrial Systems Institute (ISI) / R.C."ATHENA" Patras Science Park Platani Patra Greece Electrical and Computer Engineering Department University of Patras Rion Campus Patra Greece KNOSSOSnet Research Group Computer Informatics Engineering Department Technological Educational Institute of Western Greece Antirion Patra Greece

ISBN: (纸本)9781479983926

In this paper, a methodology towards a hardware/software implementation of an Elliptic Curve Diffie Hellman (ECDH) scheme is proposed in an effort to overcome the design problems of Elliptic Curve Cryptography (ECC) systems stemming from the highly constrained embedded system hardware and software environment (restricted RAM, storage and processing power). To achieve that, instead of the excessively slow software ECDH implementations or monolithic, not flexible hardware implementations, we propose the use of a flexible, scalar multiplication (SM) accelerator connected to the main embedded system processor in order to speed up ECDH functionality without downgrading the overall main processor performance. The proposed solution can be used for a wide variety of GF(2~k) based Elliptic Curves (EC) and is capable of shifting from one EC to another EC at runtime (flexibility). The proposed architecture was implemented and tested in Xilinx Virtex 5 technology by realizing the proposed SM accelerator unit interconnected with a Xilinx microblaze softcore processor.

关键词： Embedded systems Elliptic curves design problems Accelerators Curves PROCESSOR host processor Processor Performance

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Donor Selection for Hematopoietic Stem Cell Transplant Using Cost-Sensitive SVM

Donor Selection for Hematopoietic Stem Cell Transplant Using...

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International Conference on Machine Learning and Applications (ICMLA)

作者： Adarsh Sivasankaran Vladimir Cherkassky Mark Albrecht Eric Williams Martin Maiers Biomedical Informatics and Computational Biology Department of Electrical and Computer Engineering University of Minnesota Minneapolis Minnesota U.S.A. Bioinformatics Research National Marrow Donor Program Minneapolis Minnesota U.S.A.

ISBN: (纸本)9781509002887

Donor selection for Hematopoietic Stem Cell Transplant often requires physicians to manually select 3 to 5 donors from a list of 100s of genetically compatible donors as identified by HLA-based matching algorithms. The decision process is complicated by a lack of strict guidelines governing a "secondary" selection process, which is based upon non-HLA donor attributes. Our research is aimed at modeling this "secondary" decision process which can help physicians choose the right donors, based on donor attributes and historical choice behavior. Proposed black box models will help in improving selection consistency.

关键词： Medical services Support vector machines Data models Stem cells Mathematical model Numerical models Training

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FAMU: Study of the energy dependent transfer rate Λµp→µO

arXiv

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arXiv 2018年

作者： Mocchiutti, E. Bonvicini, V. Danailov, M. Furlanetto, E. Gadedjisso-Tossou, K.S. Guffanti, D. Pizzolotto, C. Rachevski, A. Stoychev, L. Vallazza, E. Zampa, G. Niemela, J. Ishida, K. Adamczak, A. Baccolo, G. Benocci, R. Bertoni, R. Bonesini, M. Chignoli, F. Clemenza, M. Curioni, A. Maggi, V. Mazza, R. Moretti, M. Nastasi, M. Previtali, E. Bakalov, D. Danev, P. Stoilov, M. Baldazzi, G. Campana, R. D'Antone, I. Furini, M. Fuschino, F. Labanti, C. Margotti, A. Meneghini, S. Morgante, G. Rignanese, L.P. Rossi, P.L. Zuffa, M. Cervi, T. de Bari, A. Menegolli, A. de Vecchi, C. Nardò, R. Rossella, M. Tomaselli, A. Colace, L. de Vincenzi, M. Iaciofano, A. Somma, F. Tortora, L. Ramponi, R. Vacchi, A. Sezione di Trieste via A. Valerio 2 Trieste34127 Italy Elettra-Sincrotrone Trieste S.C.p.A. SS14 Km 163.5 BasovizzaTrieste34149 Italy Mathematics and Informatics Department Udine University via delle Scienze 206 Udine Italy Abdus Salam International Centre for Theoretical Physics Strada Costiera 11 Trieste Italy Département de physique Université de Lomé 01 BP 1515 Lomé Togo Gran Sasso Science Institute - INFN-LNGS via F. Crispi 7 L’Aquila Italy RIKEN-RAL RIKEN Nishina Center for Accelerator-Based Science 2-1 Hirosawa Wako Saitama351-0198 Japan Institute of Nuclear Physics Polish Academy of Sciences Radzikowskiego 152 KrakówPL31342 Poland Sezione di Milano Bicocca piazza della Scienza 3 Milano Italy Università di Milano Bicocca Dip. di Fisica "G. Occhialini" piazza della Scienza 3 Milano Italy Università di Milano Bicocca Dip. di Scienze dell’Ambiente e della Terra piazza della Scienza 1 Miano Italy Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences blvd. Tsarigradsko ch. 72 Sofia1142 Bulgaria Sezione di Bologna viale Berti Pichat 6/2 Bologna Italy Department of Physics and Astronomy University of Bologna viale Berti Pichat 6/2 Bologna Italy INAF-IAFS Bologna Area della Ricerca via P. Gobetti 101 Bologna Italy Department of Physics University of Pavia via Bassi 6 Pavia Italy Sezione di Pavia via Bassi 6 Pavia Italy Department of Electrical Computer and Biomedical Engineering University of Pavia via Ferrata 5 Pavia Italy Sezione di Roma Tre via della Vasca Navale 84 Roma Italy Dipartimento di Ingegneria Università degli Studi Roma Tre via V. Volterra 62 Roma Italy Dipartimento di Matematica e Fisica Università di Roma Tre via della Vasca Navale 84 Roma Italy Dipartimento di Scienze Università di Roma Tre viale G. Marconi 446 Roma Italy Sezione di Milano Politecnico piazza Leonardo da Vinci 32 Milano20133 Italy

The main goal of the FAMU experiment is the measurement of the hyperfine splitting (hfs) in the 1S state of muonic hydrogen ∆Ehfs(µ−p)1S. The physical process behind this experiment is the following: µp are formed in a mixture of hydrogen and a higher-Z gas. When absorbing a photon at resonance-energy ∆Ehfs ≈ 0.182 eV, in subsequent collisions with the surrounding H2 molecules, the µp is quickly de-excited and accelerated by ∼ 2/3 of the excitation energy. The observable is the time distribution of the K-lines X-rays emitted from the µZ formed by muon transfer (µp) + Z → (µZ)∗ + p, a reaction whose rate depends on the µp kinetic energy. The maximal response, to the tuned laser wavelength, of the time distribution of X-ray from K-lines of the (µZ)∗ cascade indicate the resonance. During the preparatory phase of the FAMU experiment, several measurements have been performed both to validate the methodology and to prepare the best configuration of target and detectors for the spectroscopic measurement. We present here the crucial study of the energy dependence of the transfer rate from muonic hydrogen to oxygen (Λµp→µO), precisely measured for the first time. Copyright © 2018, The Authors. All rights reserved.

关键词： Kinetic energy

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Sub-band mean phase coherence for automated epileptic seizure detection

Sub-band mean phase coherence for automated epileptic seizur...

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International Conference on Health informatics, ICHI 2013

作者： Bandarabadi, Mojtaba Rasekhi, J. Teixeira, C.A. Dourado, A. Informatics Engineering Department University of Coimbra Coimbra Portugal Electrical and Computer Engineering Department Babol University of Technology Babol Iran

ISBN: (纸本)9783319030043

This paper presents the results of our study on sub-band phase synchronization of neural activity for automated detection of epileptic seizures. Mean phase coherence (MPC) as a measure of phase synchronization is extracted from the two adjacent intracranial electroencephalogram (iEEG) recordings, which are bandpass-filtered within the desired frequency bands. A threshold-based classifier is applied to generate the alarms. Results can be useful in two ways: for automated seizure detection, and for gaining better understanding of the synchronization behavior of epileptic seizures. The proposed method was applied on 5 invasive recordings selected from the EPILEPSIAE database. The results are compared with the MPC measures extracted from artifact removed raw iEEG signals, and show significant improvement for automated epileptic seizure detection. On average the subband MPC results in a sensitivity of 79% (43 of 54 seizures in 780h recordings) and a false detection rate of 0.05 per hour. © 2014, Springer International Publishing Switzerland.

关键词： Synchronization

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Open research issues on modeling, simulation and optimization in electrical systems

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WSEAS Transactions on Systems 2014年第1期13卷 332-334页

作者： Panoiu, M. Neri, F. Department of Electrical Engineering and Industrial Informatics University Polytehnica Timisoara Hunedoara Romania Department of Computer Science University of Naples Federico II Naples Italy

We are going to present here a number of results on open research issues in the area of Modeling, Simulation and Optimization in electrical Systems. The results range from methodologies to applications and include: power quality problems in electronic converters, control of power in complex computing environment, optimization methods for power control systems.

关键词： Power electronics

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Microwave amplifier design for solid state radar transceivers at X-band

Microwave amplifier design for solid state radar transceiver...

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作者： Korfiati, T.J. Karagianni, E.A. Vazouras, Ch.N. Lessi, Ch.C. Uzunoglu, N.K. Department of Informatics and Telecommunications National and Kapodistrian University of Athens Panepistimioupoli Athens15784 Greece Department of Naval Sciences Hellenic Naval Academy Hatzikyriakou Avenue Piraeus18539 Greece Department Division of Information Transmission Systems Material Technology School of Electrical and Computer Engineering National Technical University of Athens Zografou Campus Heroon Polytechniou 9 Zografou15780 Greece

ISBN: (纸本)9781934142301

A design approach to amplifier bias circuits using a discrete GaN on SiC HEMT is presented is presented. Incorporating matching circuits to bias circuits, various simulations are carried out to minimize the effect of bias circuits on the overall behavior of the amplifier. Simulation results show good matching with S11 = -12.2 dB, S22 = -14dB and a gain value at 15.4 dB. The resulting S parameter values correspond to K = 1.3 and D

关键词： Silicon carbide

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