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Adaptive approach for QoS support in IEEE 802.11e wireless LAN

Adaptive approach for QoS support in IEEE 802.11e wireless L...

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IEEE International Conference on Wireless and Mobile Computing, networking And Communications (WiMob)

作者： J. Naoum-Sawaya B. Ghaddar S. Khawam H. Safa H. Artail Z. Dawy Department of Electrical and Computer Engineering American University of Beirut Beirut Lebanon Mobile Computing and Networking Research Laboratory (LARIM) Ecole Polytechnique de Montreal Montreal Canada Department of Computer Science American University of Beirut Beirut Lebanon

the IEEE 802.11e standard has been introduced recently for providing quality of service (QoS) capabilities in the emerging wireless local area networks. This standard introduces a contention window based enhanced distributed channel access (EDCA) technique that provides a prioritized traffic to guarantee the minimum bandwidth needed for time critical applications. However, the EDCA technique resets statically the contention window of the mobile station after each successful transmission. This static behavior does not adapt to the network state hence reduces the network usage and results in bad performance and poor link utilization whenever the demand for link utilization increases. This paper proposes a new adaptive differentiation technique for IEEE 802.11e wireless local area networks that takes into account the network state before resetting the contention window. The performance of the proposed technique is evaluated compared to the original differentiation techniques of the IEEE 802.11a and IEEE 802.11e standards. Preliminary results show that the proposed adaptive technique enhances the channel utilization and increases throughput.

关键词： Wireless LAN Quality of service Bandwidth Intelligent networks Telecommunication traffic Throughput Helium Local area networks IP networks Delay

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Generalized discontinuous carrier-based PWM modulation scheme for multi-phase converter-machine systems

Generalized discontinuous carrier-based PWM modulation schem...

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： O. Ojo Gan Dong Department of Electrical and Computer Engineering/Center for Energy Systems Researc Laboratory for Electric Machines and Power Electronics Tennessee Technological University Cookeville TN USA

Using an expanded reference frame transformation expressed in the complex-variable form, the possibilities offered by multi-phase converters, using carrier-based, sine-triangle pulse-width modulation to generate voltages of different frequencies to actuate multi-phase electric machines are set forth. The generalized expressions for the modulation signals, including the neutral voltage component to be compared with the high frequency triangle waveform to synthesize reference voltages for both five and six-phase converter-electric machines are determined. How the inclusion of the neutral voltage affects the modulation signals and the voltage gain and waveform quality is discussed. Some experimental results of synthesized five phase converter voltage waveforms are provided to validate the voltage waveform synthesis using carrier-based generalized (dis)continuous pulse-width modulation for operation in both the under and over- modulation regimes.

关键词： Pulse width modulation Pulse width modulation converters Voltage Signal synthesis Frequency conversion Phase modulation Pulse modulation Pulse generation Electric machines Genetic expression

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Power factor control of a three-phase boost rectifier with specific power factor under asymmetrical conditions

Power factor control of a three-phase boost rectifier with s...

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： Z. Wu O. Ojo Department of Electrical and Computer Engineering Center for Energy Systems Research Laboratory for Electric Machines and Power Electronics Tennessee Technological University Cookeville TN USA

A new current controller structure for the three-phase boost rectifier, using actual phase currents achieving both controllable input power factor and constant DC voltage under asymmetrical source voltages and/or unequal line impedances, is presented in this paper. All the control variables in the new scheme are AC signals instead of the DC signals used in the industry standard synchronous reference frame controllers, eliminating the synchronous reference transformations of the currents, voltages and the hardware (phase lock loop) or software required for voltage phase angle measurement. Under asymmetrical source voltages, a generalized discontinuous PWM method is also developed which can also reduce the device switching loss of the rectifier. An attraction of this controller strategy lies in the ability to transparently achieve leading, lagging and unity power factor operation with regulated DC voltage. With a digital signal processor (DSP), the proposed control algorithm has been experimentally implemented; the experimental results demonstrate their significant effectiveness.

关键词： Reactive power Rectifiers Voltage control Pulse width modulation Impedance computer industry Industrial control Measurement standards Software standards Hardware

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Workflow - coordinated integration of enterprise/ industrial systems based on a semantic service - oriented architecture

Workflow - coordinated integration of enterprise/ industrial...

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： C. Alexakos A.P. Kalogeras S. Likothanassis J. Gialelis S. Koubias Pattern Recognition Laboratory Department of Computer Engineering and Informatics University of Patras Rio Greece Industrial Systems Institute Science Park Platani Greece Pattern Recognition Laboratory Department of Computer Engineering and Informatics Engineering and Informatics University of Patras Rio Greece Research Academic Computer Technology Institute Patras Greece Applied Electronics Laboratory Department of Electrical and Computer Engineering University of Patras Rio Greece

Enterprise integration is significant for the enforcement of novel business models in an enterprise/industry. The great heterogeneity of systems/applications in the enterprise environment requires the introduction of interoperability aspects in order to resolve integration problems in a flexible and dynamic way. Our approach introduces an advanced enterprise semantic model representing both enterprise structure and available services, through the use of ontologies. The model is associated by a specific architecture that uses the above model in combination with state-of-the-art technologies such as Web services and workflows

关键词： Application software Ontologies Web services Semantic Web computer architecture Service oriented architecture Logic Internet Electronics industry Industrial electronics

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Characterization of various etching techniques for gate level failure analysis and substrate decoration for advanced Cu/low k technologies

Characterization of various etching techniques for gate leve...

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International Symposium on Physical & Failure Analysis of Integrated Circuits

作者： Huixian Wu J. Cargo M. White Product Analysis Laboratory Agere Systems Quality Organization Allentown PA USA Department of Electrical & Computer Engineering Lehigh University Bethlehem PA USA

In this paper, VLSI technology scaling trends and challenges will be addressed. Failure analysis (FA) challenges, and failure modes for advanced technologies will also be presented. Both Cu/low k integration and gate dielectric integration issues will be discussed, followed by characterization of various poly-silicon etches used for gate oxide decoration. Finally, several different silicon substrate decoration techniques will be presented.

关键词： Etching Failure analysis Copper Integrated circuit interconnections Dielectric materials Dielectric substrates Silicon Integrated circuit technology Electromigration Delay effects

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A new controller structure for current source rectifiers

A new controller structure for current source rectifiers

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： O. Ojo S. Vanaparthy Department of Electrical and Computer Engineering/Center for Energy Systems Research Laboratory for Electric Machines and Power Electronics Tennessee Technological University Cookeville TN USA

High power three-phase current type pulse width modulation (PWM) rectifiers are becoming increasingly popular as the front-end converter in power electronic systems due to unity displacement power factor control, reduced line current harmonics and tighter electromagnetic compatibility (EMC) regulation. A new control structure utilizing the concept of input-output linearization technique, pole and zero placements using the Butterworth polynomial is designed for current source rectifiers for unity power factor operation and dc voltage regulation. Utilization of the complex-variable form model voltage equations expressed in the synchronous reference frame simplifies the presentation and design of the controllers. Experimental and computer simulation results of a controlled rectifier confirm the validity of the proposed control technique.

关键词： Rectifiers Pulse width modulation converters Voltage control Pulse width modulation Reactive power Electromagnetic compatibility EMP radiation effects Power electronics Displacement control Control systems

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Induction motor speed estimation using full-order flux observers ensuring system stability

Induction motor speed estimation using full-order flux obser...

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Annual Conference of Industrial Electronics Society

作者： G. Dong O. Ojo Department of Electrical and Computer Engineering/Center for Energy Systems Research Laboratory for Electric Machines and Power Electronics Tennessee Technological University Cookeville TN USA

A transparent full-order flux observer design methodology and a model reference adaptive mechanism to estimate the rotor speed of an induction motor are set forth which also ensures system stability in all operability regions. The observer gains are chosen using the Butterworth polynomial and the controller gains of the reference model adaptive speed controller are selected using the concept of the D-decomposition. The overall transfer function between the reference rotor and actual speeds is used to finally determine the controller parameters of the speed loop to enhance the system overall stability in the motoring, regenerative and braking modes of drive operations. The proposed controller and estimator design schemes are validated by computer simulation results for operations in the motoring and regenerating modes

关键词： Induction motors Stability Rotors Design methodology Polynomials Programmable control Adaptive control Transfer functions Control systems computer simulation

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High performance control of a boost AC-DC PWM rectifier-induction generator system

High performance control of a boost AC-DC PWM rectifier-indu...

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： J. Sastry O. Ojo Zhiqiao Wu Department of Electrical and Computer Engineering/Center for Energy Systems Research Laboratory for Electric Machines and Power Electronics Tennessee Technological University Cookeville TN USA

This paper presents a control methodology for the dc voltage regulation of an induction generator-ac-dc- boost rectifier system in which the copper loss of the generator is minimized. With the aid of an input-output linearization technique, which linearizes and decouples the model equations in the synchronous reference frame, a rotor flux vector control type high performance is achieved. Steady-state analysis provides some insights into the operability regime of the generator. The effectiveness of the control scheme under different load conditions as well as varying rotor speeds has been demonstrated by computer simulations. Some experimental results are included.

关键词： Pulse width modulation Control systems Induction generators Voltage control DC generators Rotors Rectifiers Copper Linearization techniques Equations

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Control of a dual stator winding induction machine as a source of dc power

Control of a dual stator winding induction machine as a sour...

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： Zhiqiao Wu O. Ojo J. Sastry Department of Electrical and Computer Engineering/Center for Energy Systems Research Laboratory for Electric Machines and Power Electronics Tennessee Technological University Cookeville TN USA

This paper investigates the use of a dual stator winding squirrel-cage induction machine for generating dc power using series or parallel connected ac-dc PWM rectifiers. The operating principles and constraints when generating under minimum total copper loss condition are explored using the machine steady-state model considering magnetizing flux saturation effects. Regulation of the dc voltage using concepts of the nonlinear input-output linearization method including the design of the controllers are set forth and confirmed to be effective by computer simulation results. Some experimental waveforms of the generator under load are also included in the paper.

关键词： Stator windings Induction machines Induction generators Pulse width modulation DC generators Power generation Rectifiers Copper Steady-state Magnetic flux

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Power system optimization and coordination of damping controls by series FACTS devices

Power system optimization and coordination of damping contro...

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IEEE Power engineering Society Conference and Exposition in Africa, PowerAfrica

作者： Jung-Wook Park R.G. Harley G.K. Venayagamoorthy LG Electronics Inc. Seoul South Korea School of Electrical and Computer Engineering Georgia Institute of Technology USA Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri Rolla MO USA

Controllable series line compensation by series flexible ac transmission system (FACTS) devices can provide significant transient stability improvement and effective power oscillation damping. The work presented in this paper gives an overview of control issues of series FACTS devices contributing to stable power system operation when applying suitable controllers with appropriately selected system measurements. Firstly, this paper describes two internal control schemes, which are based on the automatic power flow control mode and line impedance compensation mode, for a switching converter type based series FACTS device. Secondly, it shows that the external (secondary) control can give a solution for overall system optimization by providing well-established supplementary controls and adaptive reference changes to the internal controller. Case studies are presented with simulation results by applying the proposed controllers to the series FACTS device on a power system

关键词： Power systems Damping Control systems Automatic control Power system stability Power system transients Flexible AC transmission systems Power system simulation Power system measurements Power system control

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