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Proceedings 2003 IEEE International Symposium on Information Theory (ISIT)

作者： Hu, Yuh-Hua Wang, Lih-Chung Chen, Jiun-Ming Lai, Feipei Chou, Chun-Yen Dept. of Comp. Sci. and Info. Eng. National Taiwan University Taipei 106 Taiwan Dept. of Applied Mathematics National Donghwa University Hualien 974 Taiwan Department of Mathematics Purdue University West Lafayette IN 47907 United States Department of Electrical Engineering Dept. of Comp. Sci. and Info. Eng. National Taiwan University Taipei 106 Taiwan Dept. of Mathematical Education National Hualien Teachers College Hualien 970 Taiwan

T. Moh invented a cryptosystem called tame transformation method (TTM). TTM cryptosystem is claimed to be the fastest among all currently known unbroken public key cryptosystems. We have done an actual implementation with linear time complexity for decryption and made some performance tests on it to verify the claim of speed. Also, we give some discussion on our TTM implementation and some attacks on TTM.

关键词： Public key cryptography

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Probing charge carriers in semiconductor quantum dots by terahertz spectroscopy

Probing charge carriers in semiconductor quantum dots by ter...

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Quantum Electronics and Laser Science Conference (QELS)

作者： F. Wang M. Bonn J. Shan M.A. Islam I.P. Herman T.F. Heinz Departments of Physics and Electrical Engineering Columbia University New York NY USA Leiden Institute of Chemistry Leiden Netherlands Department of Phystcs Case Western Reserve University Cleveland OH USA Department of Applied Physics and Applied Mathematics Columbia University New York NY USA

The terahertz response of photo-excited charge carriers in CdSe quantum dots has been studied. Quantum dots containing a single electron-hole pair exhibit a real polarizability with a magnitude exceeding 10000 /spl Ar... 详细信息

关键词： Charge carriers Quantum dots US department of Transportation Spectroscopy Ultrafast optics Frequency Optical pumping Optical polarization Conductivity Pulse amplifiers

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A longitudinal study of student persistence in science, technology, engineering, and mathematics (STEM) at a regional urban university

A longitudinal study of student persistence in science, tech...

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2003 ASEE Annual Conference and Exposition: Staying in Tune with engineering Education

作者： Della-Piana, Connie Kubo Darnell, Ann Bader, Julia Romo, Lilly Rubio, Nohemi Flores, Benjamin Knaust, Helmut Brady, Thomas Swift, Andrew Model Institutions for Excellence University of Texas El Paso Model Inst. Excellence Initiative University of Texas El Paso Statistical Consulting Laboratory University of Texas El Paso Department of Electrical Engineering UTEP NSF Model Institutions Excellence Program Entering Students Prog. Sci./Eng. UTEP Department of Mathematics College of Science University of Texas El Paso Department of Biological Science Ctr. for Environ. Rsrc. Management

In 1995 the National Science Foundation (NSF) funded six minority-serving institutions in an effort to develop models for undergraduate science, technology, engineering, and mathematics (STEM) education that would increase the persistence, graduation, and success of all undergraduate STEM students;improve the quality of undergraduate STEM programs;and increase the diversity in STEM professions and graduate programs. The University of Texas at El Paso (UTEP), one of the six funded institutions, is located in the southwest corner of Texas bordering Juarez, Mexico and New Mexico. It primarily serves the predominantly Hispanic population of the region. Developed for all entering students in the College of Science and College of engineering, the Circles of Learning for Entering Students (CircLES) program is a comprehensive institutional effort starting with a weeklong STEM summer orientation. CircLES also provides students with discipline-specific student advising and requires students to participate in one to two semesters of science or engineering-oriented learning communities, based on their pre-college preparation in mathematics and English. This paper describes the design and findings of a five-year longitudinal study of student persistence in STEM since implementation of the program. Findings from the study indicate that students who participate in the program have higher retention rates in STEM, as well as at the University, and increased persistence toward graduation when compared to 1997 baseline rates. Similar results are observed when findings are disaggregated by gender, ethnicity, and level of entering mathematics course.

关键词： engineering education

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A novel multipath dispersion reduction technique based on controlled-polarization optical wireless link setup

A novel multipath dispersion reduction technique based on co...

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IEEE Instrumentation and Measurement Technology Conference

作者： G.C. Giakos N. Patnekar S. Sumrain L. Fraiwan V. Kumar G.B. Mertzios Department of Electrical and Computer Engineering Optical Electronics. Photonics Optical Communication Laboratory University of Akron Akron OH USA Department of Biomedical Engineering University of Akron Akron OH USA Division of Engineering and Applied Mathematics University of Akron Akron OH USA School of Applied Mathematical and Physical Sciences National and Technical University of Athens Athens Greece

The detection characteristics of an indoor-optical communication system, which utilizes infrared radiation as carrier has been explored and enhanced for telemedicine, and wireless local area network applications. The novelty of the presented technique consists in the fact that multipath dispersion can be reduced under controlled polarization link setup. The design of such a network is based on the specifications set by the IEEE 802.11 standard. Significant noise reduction has been achieved by utilizing wavelet transform processing algorithms.

关键词： Optical control Communication system control Infrared detectors Radiation detectors Optical fiber communication Telemedicine Wireless LAN Optical polarization Noise reduction Wavelet transforms

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Linear least-squares based methods for neural networks learning

Linear least-squares based methods for neural networks learn...

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Joint International Conferences on Artificial Neural Networks and Neural Information Processing, ICANN/ICONIP 2003

作者： Fontenla-Romero, Oscar Erdogmus, Deniz Principe, J.C. Alonso-Betanzos, Amparo Castillo, Enrique Laboratory for Research and Development in Artificial Intelligence Department of Computer Science University of A Coruña Campus de Elviña s/n Coruña15071 A Spain Computational NeuroEngineering Laboratory Electrical and Computer Engineering Department University of Florida GainesvilleFL32611 United States Department of Applied Mathematics and Computational Sciences University of Cantabria University of Castilla-La Mancha Avda de Los Castros s/n Santander39005 Spain

ISBN: (纸本)3540404082

This paper presents two algorithms to aid the supervised learning of feedforward neural networks. Specifically, an initialization and a learning algorithm are presented. The proposed methods are based on the independent optimization of a subnetwork using linear least squares. An advantage of these methods is that the dimensionality of the effective search space for the non-linear algorithm is reduced, and therefore it decreases the number of training epochs which are required to find a good solution. The performance of the proposed methods is illustrated by simulated examples. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Feedforward neural networks

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Dynamical origin for the occurrence of asynchronous hyperchaos and chaos via blowout bifurcations

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Physical Review E 2003年第6期68卷 066203-066203页

作者： Sang-Yoon Kim Woochang Lim Edward Ott Brian Hunt Institute for Research in Electronics and Applied Physics University of Maryland College Park Maryland 20742 USA Department of Physics Kangwon National University Chunchon Kangwon-Do 200-701 Korea Department of Physics and Department of Electrical and Computing Engineering University of Maryland College Park Maryland 20742 USA Institute for Physical Science and Technology and Department of Mathematics University of Maryland College Park Maryland 20742 USA

We investigate the dynamical origin for the occurrence of asynchronous hyperchaos and chaos via blowout bifurcations in coupled chaotic systems. An asynchronous hyperchaotic or chaotic attractor with a positive or negative second Lyapunov exponent appears through a blowout bifurcation. It is found that the sign of the second Lyapunov exponent of the newly born asynchronous attractor, exhibiting on-off intermittency, is determined through competition between its laminar and bursting components. When the “strength” (i.e., a weighted second Lyapunov exponent) of the bursting component is larger (smaller) than that of the laminar component, an asynchronous hyperchaotic (chaotic) attractor appears.

关键词： Chaos theory

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Geohydrological Application of a Nonlinear Physically Based Time Series Model

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IFAC Proceedings Volumes 2003年第16期36卷 1933-1938页

作者： W.L. Berendrecht A.W. Heemink F.C. van Geer J.C. Gehrels Department of Applied Mathematical Analysis Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technology P. O. Box 5031 2600 GA Delft the Netherlands Netherlands Institute of Applied Geoscience TNO National Geological Survey P.O. Box 80015 3508 TA Utrecht the Netherlands Department of Watermanagement Faculty of Civil Engineering and Geosciences Delft University of Technology P.O. Box 5048 2600 GA Delft the Netherlands

This paper presents a physically based time series model that relates groundwater level fluctuations to precipitation and evapotranspiration. The model is based on the nonlinear relation between the degree of water saturation of the subsoil and the groundwater recharge. The model is written in state-space form, while the extended Kalman filter is used to estimate the state equation. An example application shows that the model performs very well and that the addition of physical knowledge is a valuable extension to standard linear transfer function-noise models.

关键词： Extended Kalman filters Maximum likelihood estimators Nonlinear systems Physical models State-space models Time series analysis Transfer functions

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Green's function expansions in dyadic root functions for shielded layered waveguides

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Progress in Electromagnetics Research 2003年 39卷 61-91页

作者： Hanson, G.W. Nosich, A.I. Kartchevski, E.M. Department of Electrical Engineering University of Wisconsin-Milwaukee 3200 N. Cramer St Milwaukee WI 53211 United States Institute of Radio Physics and Electronics National Academy of Sciences Kharkov 61085 Ukraine Department of Applied Mathematics Kazan State University 18 Kremliovskaia Street Kazan 420008 Russia

Dyadic Green's functions for inhomogeneous parallel-plate waveguides are considered. The usual residue series form of the Green's function is examined in the case of modal degeneracies, where secondorder poles are encountered. The corresponding second-order residue contributions are properly interpreted as representing "associated functions" of the structure by constructing a new dyadic root function representation of the Hertzian potential Green's dyadic. The dyadic root functions include both eigenfunctions (corresponding to first-order residues) and associated functions, analogous to the idea of Jordan chains in finite-dimensional spaces. Numerical results are presented for the case of a two-layer parallel-plate waveguide.

关键词： Eigenvalues and eigenfunctions

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Noninvasive ultrasonic transdermal insulin delivery in rabbits using the light weight cymbal array

Noninvasive ultrasonic transdermal insulin delivery in rabbi...

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2003 IEEE Ultrasonics Symposium - Proceedings

作者： Lee, Seungjun Snyder, Benjamin Meyer, Richard J. Nayak, Vivekanand Markley, Douglas Newnham, Robert E. Smith, Nadine Barrie Bioengineering Department Pennsylvania State University University Park PA 16802 United States Material Research Laboratory Pennsylvania State University University Park PA 16802 United States Applied Research Laboratory Pennsylvania State University University Park PA 16802 United States Electrical Engineering Pennsylvania State University University Park PA 16802 United States Graduate Program in Acoustics Pennsylvania State University University Park PA 16802 United States

The low profile Cymbal array for enhanced insulin transport through in vivo animal skin using rabbits was discussed. Through the use of the cymbal array, the US-insulin experimental group showed a blood glucose level decrease of -208.1 ± 29 mg/dL within 90 minutes. The small increase in blood glucose was attributable to the low skin permeability of insulin. It was shown that the US alone did not alter the blood glucose level of the rabbit.

关键词： Ultrasonic applications

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Exponential stability of singularly perturbed systems with time delay

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Applicable Analysis 2003年第2期82卷 117-130页

作者： Liu, Xinzhi Shen, Xuemin Zhang, Yi Department of Applied Mathematics University of Waterloo Waterloo ON N2L 3G1 Canada Department of Electrical and Computer Engineering University of Waterloo Waterloo ON N2L 3G1 Canada Department of Mathematics Xuzhou Normal University Xuzhou Jiangsu 221009 China

In this article, we study the exponential stability of singularly perturbed systems with time delay. By using vector delay inequalities and Lyapunov functions, exponential stability criteria are derived for both linear and some classes of nonlinear singularly perturbed systems with time delay. Examples are given to verify the stability criteria. © 2003, Taylor & Francis Group, LLC.

关键词： Exponential Stability Singular Perturbation Time Delay

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