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A dynamic uplink scheduling scheme for WiMAX networks

A dynamic uplink scheduling scheme for WiMAX networks

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International Conference on Computer engineering and systems

作者： Nada M. El-Shennawy Mohamed N. El-Derini Mostafa A. Youssef Mahmoud M. Fahmy Computers and Automatic Control Dept. Tanta University Tanta Egypt Computer Science and Engineering E-JUST Alexandria Egypt Vice Rector for Education and Student Affairs Pharos University Alexandria Egypt

Over the past few years, there has been a rapid growth of new services such as online video games, video conferences, and multimedia services to end users. WiMAX is an emerging technology for next generation wireless networks which supports a large number of users. To achieve Quality of Service (QoS) requirements, an efficient and reliable scheduling algorithm is urgently needed. Among a large number of the proposed approaches in the literature, a variably weighted round robin scheduling algorithm (VWRR) has been proven to provide the best performance in an IP backbone network with no attempts on WiMAX networks. This paper proposes a dynamic uplink scheduling algorithm for WiMAX networks based on VWRR to allocate the bandwidth to users to maximize the throughput and ensure the constraints of delay, jitter, and load. A comparative study between the proposed scheduling algorithm and the two most famous scheduling algorithms: weighted round robin algorithm (WRR) and modified deficit round robin algorithm (MDRR) over WiMAX networks, is presented. Simulation results obtained using OPNET reveal that the proposed algorithm has a superior performance compared with WRR with respect to throughput, delay, jitter, and load. Additionally, the proposed scheduling algorithm is shown to provide an excellent level of reliability and scalability when increasing the number of served subscriber stations.

关键词： WiMAX Uplink Quality of service Round robin Throughput Bandwidth

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Actuator-fault Detection and Isolation based on Interval Observers and Invariant Sets

Actuator-fault Detection and Isolation based on Interval Obs...

引用

IEEE Annual Conference on Decision and control

作者： Feng Xu Vicen? Puig Carlos Ocampo-Martinez Florin Stoican Sorin Olaru Institut de Robotica i Informatica Industrial (CSIC-UPC) Technical University of Catalonia (UPC) Llorens i Artigas 4-6 08028 Barcelona Spain Dept. of Automatic Control and Systems Engineering Faculty of Automatic Control and Computers "Politehnica" University of Bucharest 313 Spl. Independentei 060042 Bucharest Romania E3S (SUPELEC Systems Sceinces) Automatic Control Departement Gif sur Yvette France

ISBN: (纸本)9781467357159;9781467357159

This paper proposes an interval observer-based actuator fault detection and isolation (FDI) approach. An interval observer matching the healthy system mode is designed to monitor the system. When the system is in different modes, state or output interval vectors predicted by the interval observer manifest different dynamical behaviors. To guarantee reliable FDI, a collection of invariant set-based FDI conditions are established. Under these conditions, actuator faults can be accurately detected and isolated during the transition between different modes. At the end, the effectiveness of this proposed approach is presented by using a numerical example.

关键词： FDI Actuator-fault Detection Invariant Sets

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Structured coprime factorizations description of Linear and Time-Invariant networks

Structured coprime factorizations description of Linear and ...

引用

IEEE Conference on Decision and control

作者： Şerban Săbau Cristian Oară Sean Warnick Ali Jadbabaie Stevens Institute of Technology Hoboken NJ US Faculty of the Automatic Control Dept. University “Politehnica” Bucharest Romania The Faculty of the Computer Science Department Brigham Young University Faculty of the Electrical and Systems Engineering Dept University of Pennsylvannia

In this paper we study state-space realizations of Linear and Time-Invariant (LTI) systems. Motivated by biochemical reaction networks, Gonçalves and Warnick have recently introduced the notion of a Dynamical Structure Functions (DSF), a particular factorization of the system's transfer function matrix that elucidates the interconnection structure in dependencies between manifest variables. We build onto this work by showing an intrinsic connection between a DSF and certain sparse left coprime factorizations. By establishing this link, we provide an interesting systems theoretic interpretation of sparsity patterns of coprime factors. In particular we show how the sparsity of these coprime factors allows for a given LTI system to be implemented as a network of LTI sub-systems. We examine possible applications in distributed control such as the design of a LTI controller that can be implemented over a network with a pre-specified topology.

关键词： Transfer functions Equations Indium phosphide Mathematical model Network topology Topology Electronic mail

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Research on electromagnetic susceptibility of fiber optical gyroscope

Research on electromagnetic susceptibility of fiber optical ...

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2012 International Symposium on Photonics and Optoelectronics, SOPO 2012

作者： Liu, Jieyu Xu, Junhui Ma, Xuewen Dept. of Automatic Control Second Artillery Engineering University Xi'an China

ISBN: (纸本)9781457709111

As an new optical instrument, Fiber Optical Gyroscope (FOG) is used in guidance and navigation system more and more. But the problem is that it can be disturbed by electromagnetic environment easily. According to apply electromagnetic interference signal with different strength and frequency, an electromagnetic environment simulation system is presented to study its electromagnetic susceptibility based on the test data by model building analysis method and variance analysis method. © 2012 IEEE.

关键词： Electromagnetic pulse

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Hybrid geno-fuzzy controller for seismic vibration control

Hybrid geno-fuzzy controller for seismic vibration control

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2012 UKACC International Conference on control, control 2012

作者： Patrascu, Monica Dumitrache, Ioan Dept. of Automatic Control and Systems Engineering University Politehnica of Bucharest Bucharest Romania

ISBN: (纸本)9781467315609

This paper evaluates the possibility of applying a geno-fuzzy control strategy to a magnetorheological semi-active damper for seismic vibration control. The proposed control starategy is designed and then tested and validated in a simulated environment. The control strategy is validated by considering a more destructive seismic disturbance as input for the damper-structure system. The proposed geno-fuzzy hybrid controller offers improved performance and implementability for real-time applications. © 2012 IEEE.

关键词： Vibration control

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Modeling and control of a Novel Hybrid Ground Aerial Robot

Modeling and Control of a Novel Hybrid Ground Aerial Robot

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IEEE International Conference on Mechatronics and Automation

作者： Mahmoud Elsamanty Mohamed Fanni Ahmed Ramadan Ahmed Abo-Ismail Mechatronics and Robotics Eng. Dept. Egypt-Japan University of Science and Technology Alexandria Egypt Adjunct Professor at Mechatronics and Robotics Eng. Dept. Egypt-Japan University of Science and Technology. Prod. Eng. & Mechanical Design Dept. Mansoura University Mansoura Egypt. Adjunct Professor at Mechatronics and Robotics Eng. Dept. Egypt-Japan University of Science and Technology. Computers Engineering & Automatic Control Dept. Tanta University Tanta Egypt.

ISBN: (纸本)9781467355599

This paper presents the dynamic modeling and control simulation of a novel robot that combines flying motion and on ground motion into an integrated single robot. The ground motion is based on four wheels configuration that provides more stability. The flying motion is depending on the flying mechanism of quadrotor system. Smart transformation mechanism is developed to switch the robot from the ground motion configuration to the flying motion configuration and vice versa without adding any additional actuators. A manipulator with 3 DOF is added to handle an object during the ground motion and it is useful to hold this object during the flying motion. A CAD model is developed using SOLIDWORKS. The dynamic model of this robot is derived to achieve the eccentricity of the payload, the weight of the eccentric manipulator and managing the variation of the payload in the dynamic model. The derived robot dynamics are highly nonlinear. A controller is designed based on feedback linearization technique to stabilize the robot attitude and altitude. controlling the horizontal movements' nonholonomic constraints is used to generate the desired trajectories of robot attitudes. Another dynamic model and controller have been established for the transformation mechanism. Finally, the simulation results using MATLAB/SIMULINK show that the controller successfully vanish the eccentric effect and stabilize the robot attitude.

关键词： Flying robot Dynamic Modeling of UA V Feedback Linearization technique controller design

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Implement of fuzzy logic system using table lookup scheme by Java language to predict time series data

Implement of fuzzy logic system using table lookup scheme by...

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2012 13th International Carpathian control Conference, ICCC 2012

作者： Kokes, J. Nghien, N.B. Dept. of Automatic Control and Engineering Informatics Czech Technical University in Prague Prague Czech Republic

ISBN: (纸本)9781457718687

Forecasting the future time series values from the past values plays important role in daily life. There are some techniques support for time series analysis such as statistics, Neural Network (NN), Fuzzy Logic (FL) and fusion NN and FL. However, there is lack of easy, free and visual tools for users to analysis time series data. In this paper we try to use Java program language to implement of Fuzzy Logic system using table lookup scheme to predict time series data. The results of our experiments show that our tool can give a high accuracy of prediction results. Since program is written in Java language so it can run across hardware and software platform and easily embed into website for user run through Internet. © 2012 IEEE.

关键词： Forecasting

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Using constrained cubic spline instead of natural cubic spline to eliminate overshoot and undershoot in Hilbert Huang transform

Using constrained cubic spline instead of natural cubic spli...

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2012 13th International Carpathian control Conference, ICCC 2012

作者： Kokes, J. Nghien, N.B. Dept. of Automatic Control and Engineering Informatics Czech Technical University in Prague Prague Czech Republic

ISBN: (纸本)9781457718687

Hilbert-Huang Transform (HHT), proposed by N. E. Huang in 1998, is a novel algorithm for nonlinear and non-stationary signal processing. The key part of this method is decomposition the signal into finite number of Intrinsic Mode Functions (IMF) which will meet the requirements of Hilbert Transform. In this part, the algorithm uses natural cubic spline to connect all local maxima and local minima to produce upper and lower envelope of the signal. However natural cubic spline which may lead overshoot and undershoot at intermediate point. In this paper we propose to apply constrained cubic spline into first part of the HHT to eliminate overshoot in upper and lower envelope. We also propose an improvement on Improved Slope Base Method (ISBM) to limit swing at the end points. The experiments showed that our proposals get better result than original proposal and speed up Empirical Mode Decomposition (EMD) process. © 2012 IEEE.

关键词： Empirical mode decomposition

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Robust LMI control of a buck-boost converter with low ripple propagation

Robust LMI control of a buck-boost converter with low ripple...

引用

2012 20th Mediterranean Conference on control and Automation, MED 2012

作者： Ingles, J.V. Garces, P. Leyva, R. Dept. of Electronic Electrical and Automatic Control Engineering Universitat Rovira i Virgili 43007 Tarragona Spain

ISBN: (纸本)9781467325318

This paper proposes a new robust control strategy to prevent the current ripple propagation into the dc-dc converter input, thus avoiding converter malfunctions. Concretely, we apply the new strategy to a buck-boost converter. The strategy is based on LMI control and use readily, fast convex optimization algorithms to obtain the solution. The control objective is maximizing the current disturbance rejection, where current ripple propagation and usual, prescribed dynamic performances are ensured. The paper describes the control design procedure, besides an illustrative example and simulation verifications. Simulation waveforms are in perfect agreement with objective function and performances constraints of the control design. That is, the current ripple propagation is almost zero and other prescribed constraints are satisfied. © 2012 IEEE.

关键词： Buck-Boost converter

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Characterization of Patients with Different Ventricular Ejection Fractions using Blood Pressure Signal Analysis

Characterization of Patients with Different Ventricular Ejec...

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Computing in Cardiology Conference

作者： Andres Arcentales Andreas Voss Pere Caminal Antonio Bayés-Genís M Teresa Domingo Beatriz F Giraldo Institut de Bioenginyeria de Catalunya (IBEC) Barcelona Spain Dept. of Medical Engineering and Biotechnology University of Applied Sciences Jena Germany Dept. of Automatic Control (ESAII) Universitat Politécnica de Catalunya Barcelona Spain Cardiology Service Hospital Universitari Germans Trias i Pujol Badalona Spain Cardiology Service Hospital de la Santa Creu i Sant Pau Barcelona Spain

ISBN: (纸本)9781479908851

Ischemic and dilated cardiomyopathy are associated with disorders of myocardium. Using the blood pressure (BP) signal and the values of the ventricular ejection fraction, we obtained parameters for stratifying cardiomyopathy patients as low- and high-risk. We studied 48 cardiomyopathy patients characterized by NYHA >2: 19 patients with dilated cardiomyopathy (DCM) and 29 patients with ischemic cardiomyopathy (ICM). The left ventricular ejection fraction (LVEF) percentage was used to classify patients in low risk (LR: LVEF > 35%, 17 patients) and high risk (HR: LVEF < 35%, 31 patients) groups. From the BP signal, we extracted the upward systolic slope (BP_(s1)), the difference between systolic and diastolic BP (BPA), and systolic time intervals (STI). When we compared the LR and HR groups in the time domain analysis, the best parameters were standard deviation (SD) of 1/STI, kurtosis (K) of BP_(sl) and K of BP A. In the frequency domain analysis, very low frequency (VLF) and high frequency (HF) bands showed statistically significant differences in comaprisons of LR and HR groups. The area under the curve of power spectral density was the best parameter in all classifications, and particularly in the very-low- and high-frequency bands (p < 0.001). These parameters could help to improve the risk stratification of cardiomyopathy patients.

关键词： BP DCM NYHA

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