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International Conference on computer engineering and systems

作者： Hossam M.A. Fahmy Computer Engineering & Systems Dept. Ain Shams Univ. Egypt

ICCES'2011 is the seventh scientific gathering organized by the computer engineering and systems Department at the Faculty of engineering, Ain Shams University. Welcoming you among us is the summit of twelve month...

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Real-time 3-D Object Tracking Using Kinect Sensor

Real-time 3-D Object Tracking Using Kinect Sensor

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IEEE International Conference on Robotics and Biomimetics

作者： Takayuki Nakamura Faculty of Systems Engineering Dept. of Computer and Communication Sciences Wakayama University

ISBN: (纸本)9781457721366

In this paper, we propose a novel method for real-time three-dimensional (3-D) object tracking based on integration of 3-D range and color information. To get 3-D range and color information simultaneously, our method utilizes the Microsoft Kinect sensor which is composed of dept. and color cameras. 3-D range and color information are integrated using the estimated dept. and color cameras intrinsic parameters and relative transformation between the cameras. The target region can be tracked by processing dept. pixels with color information. Through experiment in real environment, we confirm the validity of our method.

关键词： chromatic information game player color camera Three Dimensions

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R&D toward a compact high-brilliance X-ray source based on channeling radiation

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AIP Conference Proceedings 2012年第1期1507卷 734-739页

作者： P. Piot C. A. Brau W. E. Gabella B. K. Choi J. D. Jarvis J. W. Lewellen M. H. Mendenhall D. Mihalcea Northern Illinois Center for Accelerator & Detector Development and Department of Physics Northern Illinois University DeKalb IL 60115 USA and Accelerator Physics Center Fermi National Accelerator Laboratory Batavia IL 60510 USA Department of Physics and Astronomy Vanderbilt University Nashville TN 37235 USA Dept. of Electrical Engineering and Computer Science Vanderbilt University Nashville TN 37235 USA and Vanderbilt Institute of Nanoscale Science and Engineering Vanderbilt University Nashville TN 37235 USA Physics Department & Combat Systems Naval Postgraduate School Monterey CA 93943 USA Northern Illinois Center for Accelerator & Detector Development and Department of Physics Northern Illinois University DeKalb IL 60115 USA

X-rays have been valuable to a large number of fields including Science, Medicine, and Security. Yet, the availability of a compact high-spectral brilliance X-ray sources is limited. A technique to produce X-rays with spectral brilliance ℬ ∼ 1012 photons.(mm-mrd)−2. (0.1% BW)−1.s−1 is discussed. The method is based on the generation and acceleration of a low-emittance field-emitted electron bunches. The bunches are then focused on a diamond crystal thereby producing channeling radiation. In this paper, after presenting the overarching concept, we discuss the generation, acceleration and transport of the low-emittance bunches with parameters consistent with the production of high-brilliance X-rays through channeling radiation. We especially consider the example of the Advanced Superconducting Test Accelerator (ASTA) currently in construction at Fermilab where a proof-of-principle experiment is in preparation.

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Polyphase Filter Banks for Embedded Sample Rate Changes in Digital Radio Front-Ends

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ZTE Communications 2011年第4期9卷 3-9页

作者： Mehmood Awan Yannick Le Moullec Peter Koch Fred Harris Technology Platforms Section Dept. of Electronic Systems Aalborg University Denmark Dept. of Electrical & Computer Engineering San Diego State UniversityCA USA

This paper presents efficient processing engines for software-defined radio （SDR） front-ends. These engines, based on a polyphase channelizer, perform arbitrary sample-rate changes, frequency selection, and bandwidth control. This paper presents an M-path polyphase filter bank based on a modified N-path polyphase filter. Such a system allows resampling by arbitrary ratios while performing baseband aliasing from center frequencies at Nyquist zones that are not multiples of the output sample rate. This resampling technique is based on sliding cyclic data load interacting with cyclic-shifted coefficients. A non-maximally-decimated polyphase filterbank （where the number of data loads is not equal to the number of M subfilters） processes M subfilters in a time period that is less than or greater than the M data loads. A polyphase filter bank with five different resampling modes is used as a case study for embedded resamp/ing in SDR front-ends. These modes are （i） maximally decimated, （ii） Under-decimated, （iii） over-decimated, and combined up- and down-sampling with （iv） single stride length, and （v） multiple stride lengths. These modes can be used to obtain any required rational sampling rate change in an SDR front-end based on a polyphase channelizer. They can also be used for translation to and from arbitrary center frequencies that are unrelated to the output sample rates.

关键词： SDR digital front-ends polyphase filter bank embedded resampling

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Near optimal control of mobile robot formations

Near optimal control of mobile robot formations

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IEEE Symposium on Adaptive Dynamic Programming and Reinforcement Learning

作者： Dierks, Travis Brenner, Bryan Jagannathan, S. Strategic Initiatives DRS Sustainment Systems Inc. St. Louis MO United States Dept. of Electrical and Computer Engineering Missouri University of Science and Technology Rolla MO United States

ISBN: (纸本)9781424498888

In this paper, the infinite horizon optimal tracking control problem is solved online and forward-in-time for leader-follower based formation control of nonholonomic mobile robots. Using the backstepping design approach, the dynamical controller inputs for the robots are approximated from nonlinear optimal control techniques in order to track the control velocities designed to keep the formation. The proposed nonlinear optimal control technique, referred to as adaptive dynamic programming, uses neural networks (NN's) to solve the optimal formation control problem in discrete-time in the presence of unknown internal dynamics and a known control coefficient matrix. All NN's are tuned online using novel weight update laws, and the stability of the entire formation is demonstrated using Lyapunov methods. Simulation results are provided to demonstrate the effectiveness of the proposed approach. © 2011 IEEE.

关键词： Multi agent systems

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Analytical Trajectory Extrapolation for Power systems

Analytical Trajectory Extrapolation for Power Systems

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IEEE Power and Energy Society General Meeting

作者： Shaobu Wang Ghadir Radman Gang Zheng Wenzhong Gao Center for Energy Systems Research Tennessee Technological University Dept. of Electrical and Computer Engineering Tennessee Technological University Dept. of Electrical and Computer Engineering University of Denver

ISBN: (纸本)9781457710001

Trajectory extrapolation is important for stability analysis and control of modern power systems. Many functions such as security warning and time-delay compensation for wide-area feedback control can be developed through trajectory extrapolation. But as of now, there are no effective methods to extrapolate power system trajectories except for time-consuming numerical integration methods. The difficulties for trajectory extrapolation in power systems lie within the fact that the underlying dynamic equations are nonlinear, and thus analytical solutions are not possible. In this paper, a method is proposed to approximate the analytical solution of power system dynamics, by which trajectories can be extrapolated. First, the dynamic equations of power system are modified to an equivalent set of equations by polynomial projection technique. Based on the modified equations, an approximate analytical solution is obtained using algebraic Picard iteration without integration operation. This solution depends on the initial values and can be used for on-line trajectory extrapolation. Following a disturbance, with values at the instant of disturbance clearance known (i.e. through PMU - measurements), one can easily extrapolate the system trajectory by extending the approximate analytical solution and updating initial values. Finally, some simulation results are presented to show the effectiveness of the method.

关键词： Power systems Trajectory extrapolation Analytical solution approximation Nonlinear differential equations Picard iteration power systems nonlinear differential equations trajectory Power system dynamics delay compensation approximate analysis Equation ANALYTICAL SOLUTION

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Application-specific codesign platform generation for digital mockups in cyber-physical systems

Application-specific codesign platform generation for digita...

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Electronic System Level Synthesis Conference (ESLsyn)

作者： Bailey Miller Frank VahicK Tony Givargis Dept. Computer Science & Engineering University of California Riverside USA Dept. Computer Science & Engineering University of California Riverside Center for Embedded Computer Systems University of California Irvine USA

The testing of cyber-physical systems requires validating device functionality for a wide range of operating conditions. The environment with which the cyber-physical device interacts, such as lungs for a medical ventilator device or a busy freeway for an autonomous vehicle, may be complex and subsequently difficult to explore all possible configurations. computer simulations that utilize device and environment behavioral models may be used as a first stage of testing, but at some point development must occur using the real device running in real-time. We present a codesign framework for aiding cyber-physical device development where real devices or prototypes are connected to real-time models that simulate the interacting environment. Such test setups are known as digital mockups and allow for testing environment scenarios that are hard to capture with commonly-used but limited physical mockups. The framework supports model hardware/software codesign to enable models of varying speed and accuracy to be implemented within an embedded processor or as a custom coprocessor circuit on an FPGA. We describe an accompanying tool that generates code templates to reduce the time required to develop digital mockup test setups. We utilize the framework to build a digital mockup test setup for a commercial ventilator, and showcase codesign capabilities by implementing environmental models as both circuits and as instructions on a processor.

关键词： Integrated circuit modeling Transducers Coprocessors Mathematical model Computational modeling Real time systems Unified modeling language

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Robustness of Inverse Perturbation for Discrete Event Control

Robustness of Inverse Perturbation for Discrete Event Contro...

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

作者： Nidhal Bouaynaya Roman Shterenberg Dan Schonfeld Dept. of Systems Engineering University of Arkansas at Little Rock Dept. of Mathematics University of Alabama at Birmingham Dept. of Electrical and Computer Engineering University of Illinois at Chicago

ISBN: (纸本)9781424441211

We study the robustness of the inverse perturbation solution in discrete-time systems modeled by homogeneous Markov chains. We cast the optimal inverse perturbation control as a strictly convex optimization problem, which admits a unique global solution. We show that the optimal inverse perturbation control is robust to estimation errors in the original network. The derived results are applied to the Human melanoma gene regulatory network, where the aim is to force the network to converge to a desired steady-state distribution of gene regulation.

关键词： Finite Markov chains Perturbation theory Inverse perturbation Stability Robustness

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Adaptive Scanning and Handover Triggering for Mobile WiMAX

Adaptive Scanning and Handover Triggering for Mobile WiMAX

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2011 13th IEEE Joint International computer Science and Information Technology Conference(JICSIT 2011)

作者： Rania Elkotby Rawya Rizk Mahmoud Marie EE Dept. Port Said University Port-Said Computer Engineering and Systems Dept. El-Azhar University

ISBN: (纸本)9781424486045

Handover delay in mobile communication causes degradation in system performance, especially when implemented in real-time applications. The first and most consuming phase in the handover process is the scanning phase. This paper focuses on the trigger and the sequence in which the scanning is done to optimize this process. In this paper, a scanning and handover triggering scheme is proposed. It combines between the multi-scanning concept and the dynamic adaptation of the scanning activity triggering according to the changing down rate of the signal strength of the serving base stations. In addition, an adaptive handover threshold is considered to adapt the handover triggering. Numerical results show that the proposed scheme reduces the handover delay and enhances the resources utilization.

关键词： handover mobile WiMAX Received Signal Strength Indication (RSSI) scanning time.

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A novel PSO based carrier frequency offset estimation technique for Wi-MAX uplink transmissions

A novel PSO based carrier frequency offset estimation techni...

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2011 11th International Conference on Hybrid Intelligent systems, HIS 2011

作者： Al-Humaidan, Fahad M. Rahoof, P.P. Sameer, S.M. Dept. of Information Systems College of Computer Science and Information Technology King Faisal University Al Ahsa-31982 Saudi Arabia Dept. of Communication and Networks College of Computer Science and Information Technology King Faisal University Al Ahsa-31982 Saudi Arabia Department of Electronics and Communication Engineering National Institute of Technology Calicut Kerala 673601 India

ISBN: (纸本)9781457721502

Carrier frequency offset (CFO) estimation is a challenging task in Wi-MAX uplink as it uses orthogonal frequency division multiple access (OFDMA) which demands extremely accurate frequency synchronization. Here each user may experience a different CFO relative to the base station reference carrier and the estimation of them turn out to be a multiple parameter estimation problem. In this paper, we propose a null subcarrier based particle swam optimization (PSO) technique that performs the estimation by minimizing a cost function. As compared to the null subcarrier based grid search algorithm available in the literature, the computational complexity of the proposed technique is very low. The mean square error of the CFO estimator and bit error rate performance of the Wi-MAX base station receiver that employs the proposed estimation method are studied through computer simulations. It has been shown that the proposed technique achieves a better performance than the grid search algorithm at low to medium signal to noise ratio (SNR) where the algorithm reliability really matters. © 2011 IEEE.

关键词： Mean square error

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