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Numerical modeling of the transient response in thulium-doped fiber amplifiers

Numerical modeling of the transient response in thulium-dope...

引用

Optical Fiber Communication (OFC) Conference

作者： J. Kim S.S.-H. Yam M.E. Marchic L.G. Kazovsky Photonics and Networking Research Laboratory Stanford University Stanford California USA Department of Electrical and Computer Engineering Queen's University Kingston Ontario Canada

A transient response model for thulium-doped fiber amplifier is presented. With an optimally chosen method for numerical integration, we can successfully estimate the transient response of thulium-doped amplifier, whi... 详细信息

ISBN: (纸本)1557527849

关键词： Numerical models Transient response Optical fiber amplifiers Optical fiber networks Optical pumping Transient analysis Semiconductor optical amplifiers Integrated optics Stimulated emission Energy states

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2.40-2.48 GHz bandpass filter in 0.18 /spl mu/m CMOS

2.40-2.48 GHz bandpass filter in 0.18 /spl mu/m CMOS

引用

IEEE International Workshop on Radio-Frequency Integration Technology (RFIT)

作者： R.C. Yadav K.S. Lee V. Bharadwaj Integrated Circuits and Systems Laboratory Institute of Microelectronics Singapore Department of Electrical and Computer Engineering National University of Singapore Singapore

A band-pass filter operating in 2.40 GHz to 2.48 GHz range is designed in 0.18 /spl mu/m CMOS technology. It has tunable center frequency, Q-factor and gain. The fully integrated system-on-chip (SOC) 10th order band-pass filter is built by cascading five stages of 2nd order. The simulation of the filter on ADS software provides an insertion gain of 8 dB in the pass-band frequency from 2.40 GHz to 2.48 GHz. The attenuation in the stop-band is observed to be higher than 50 dB at 400 MHz away from pass-band edge with 15 mA current sinking from a 1.8 V supply. We present several simulation results to highlight these characteristics.

关键词： Band pass filters Frequency Circuits MOSFETs Inductors Q factor CMOS technology Impedance Reflection Resistors

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Programmed wavelength-hopping semiconductor laser

Programmed wavelength-hopping semiconductor laser

引用

IEEE Photonics Conference (IPC)

作者： A.J. Lowery M. Premaratne Advanced Computing and Simulation Laboratory (A-çL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia

A semiconductor laser and fiber with three separated Bragg gratings will automatically tune through three wavelengths. We investigate this device using numerical simulations to illustrate the evolution of the spectrum... 详细信息

关键词： Semiconductor lasers Fiber lasers Laser tuning Optical sensors Optical fiber devices Optical fiber sensors Fiber gratings Bragg gratings Numerical simulation Signal generators

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Neural networks based non-uniform scalar quantizer design with particle swarm optimization

Neural networks based non-uniform scalar quantizer design wi...

引用

IEEE Swarm Intelligence Symposium, SIS

作者： W. Zha G.K. Venayagamoorthy Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri Rolla MO USA

Quantization is a crucial link in the process of digital speech communication. Non-uniform quantizer such as the logarithm quantizers are commonly used in practice. In this paper, a companding non-uniform quantizer is designed using two neural networks to perform the nonlinear transformation. Particle swarm optimization is applied to find the weights of neural networks such that the signal to noise ratio (SNR) is maximized. Simulation results on different speech samples are presented and the proposed quantizer design is compared with the logarithm quantizer for bit rates ranging from 3 to 8.

关键词： Neural networks Particle swarm optimization Quantization Bit rate Signal to noise ratio Humans Ear Nonlinear distortion Speech processing Oral communication

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Dual ferrohydrodynamic and electrohydrodynamic flow instabilities and patterns in uniform dc, ac and rotating fields

Dual ferrohydrodynamic and electrohydrodynamic flow instabil...

引用

International Conference on Conduction and Breakdown in Dielectric Liquids

作者： M. Zahn Department of Electrical Engineering and Computer Science Laboratory for Electromagnetic and Electronic Systems Massachusetts Institute of Technology Cambridge MA USA

Continuum electromechanics of ferrohydrodynamic interactions in magnetic liquids (ferrofluids) and dual electrohydrodynamic interactions with polarizable dielectric liquids are described and compared. Simple dual experiments presented include: the rise of ferrofluid around a current-carrying wire and the rise of dielectric liquid between diverging electrodes; ferrohydrodynamic and electrohydrodynamic peaking interfacial instability with a perpendicular magnetic or electric field; and electric and magnetic labyrinth instability when a thin layer of magnetic or dielectric fluid is stressed by a uniform magnetic or electric field parallel to the thin dimension of the interface. New spiral and droplet patterns that form in combined DC and rotating uniform magnetic fields are presented for magnetic liquids.

关键词： Electrohydrodynamics Saturation magnetization Magnetic separation Magnetosphere Magnetic materials Magnetic liquids Magnetic fields Dielectric liquids Magnetic domains Seals

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Object-reuse for more predictable real-time Java behavior

Object-reuse for more predictable real-time Java behavior

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International Symposium on Object-Oriented Real-Time Distributed Computing

作者： J. Al-Jaroodi N. Mohamed Electrical and Computer Engineering Department Stevens Institute of Technology Dependable Systems Middleware Research Laboratory Hoboken NJ USA

One of the problems with Java for real-time systems is the unpredictable behavior of garbage collection (GC). GC introduces unexpected load and causes undesirable delays for real-time applications. In this paper, we propose a technique that reduces and bounds the memory requirements for real-time Java programs. This technique can eliminate or reduce the need for GC and allows for a more predictable execution behavior and efficient utilization of the available memory. A theoretical model is presented and a number of benchmark tests are used to evaluate this technique in PERC, NewMonics' real-time JVM, and Sun's JVM. The results show that in some cases GC can be eliminated and an application's execution time decreases and becomes more predictable.

关键词： Java Memory management Delay Middleware Real time systems Application software Benchmark testing Timing Databases Costs

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Comparison of non-uniform optimal quantizer designs for speech coding with adaptive critics and particle swarm

Comparison of non-uniform optimal quantizer designs for spee...

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

作者： W. Zha G.K. Venayagamoorthy Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri Rolla MO USA

This paper presents the design of a companding non-uniform optimal scalar quantizer for speech coding. The quantizer is designed using two neural networks to perform the nonlinear transformation. These neural networks are used in the front and back ends of a uniform quantizer. Two approaches are presented in this paper namely adaptive critic designs (ACD) and particle swarm optimization (PSO), aiming to maximize the signal to noise ratio (SNR). The comparison of these optimal quantizer designs over bit rate range of 3 to 6 is presented. The perceptual quality of the coding is evaluated by the International Telecommunication Union's Perceptual Evaluation of Speech Quality (PESQ) standard.

关键词： Speech coding Particle swarm optimization Quantization Neural networks Bit rate Speech analysis Signal to noise ratio Telecommunication standards Humans Signal resolution

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A neural network based optimal wide area control scheme for a power system

A neural network based optimal wide area control scheme for ...

引用

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

作者： G.K. Venayagamoorthy S. Ray Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri Rolla MO USA

With deregulation of the power industry, many tie lines between control areas are driven to operate near their maximum capacity, especially those serving heavy load centers. Wide area control systems (WACSs) using wide-area or global signals can provide remote auxiliary control signals to local controllers such as automatic voltage regulators, power system stabilizers, etc to damp out inter-area oscillations. This paper presents the design and the DSP implementation of a nonlinear optimal wide area controller based on adaptive critic designs and neural networks for a power system on the real-time digital simulator (RTDS/spl reg/). The performance of the WACS as a power system stability agent is studied using the Kundur's two area power system example. The WACS provides better damping of power system oscillations under small and large disturbances even with the inclusion of local power system stabilizers.

关键词： Neural networks Optimal control Control systems Power system control Power systems Power system simulation Power system stability Automatic voltage control Automatic control Power industry

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Cost-based scheduling of scientific workflow applications on utility grids

Cost-based scheduling of scientific workflow applications on...

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IEEE International Conference on e-Science and Grid Computing

作者： Jia Yu R. Buyya Chen Khong Tham Grid Computing and Distributed Systems Laboratory Department of Computer Science and Software Engineering University of Melbourne VIC Australia Department of Electrical and Computer Engineering National University of Singapore Singapore

Over the last few years, grid technologies have progressed towards a service-oriented paradigm that enables a new way of service provisioning based on utility computing models. Users consume these services based on their QoS (quality of service) requirements. In such "pay-per-use" grids, workflow execution cost must be considered during scheduling based on users' QoS constraints. In this paper, we propose a cost-based workflow scheduling algorithm that minimizes execution cost while meeting the deadline for delivering results. It can also adapt to the delays of service executions by rescheduling unexecuted tasks. We also attempt to optimally solve the task scheduling problem in branches with several sequential tasks by modeling the branch as a Markov decision process and using the value iteration method

关键词： Optimal scheduling Processor scheduling Scheduling algorithm Workflow management software Grid computing Quality of service Costs computer networks Time factors Delay

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Active photonic circuits and biophotonics at Monash University, Australia

Active photonic circuits and biophotonics at Monash Universi...

引用

IEEE Photonics Conference (IPC)

作者： A.J. Lowery M. Premaratne Advanced computing and Simulation Laboratory (AXL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia

We outline the research and development taking place at Monash University, Melbourne, Australia, in the fields of active photonic circuit design and simulation, and biophotonics.

关键词： Circuits Biophotonics Optical packet switching Optical signal processing Optical filters Computational modeling Biomedical optical imaging High speed optical techniques Optical saturation Fiber lasers

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