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检索条件"机构=Advanced Computing and Simulation Laboratory"

共 200 条记录，以下是161-170 订阅

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Plasmonic waveguides with resonant-cavity structures for nanophotonics applications

Plasmonic waveguides with resonant-cavity structures for nan...

引用

International Conference on Quantum Electronics (IQEC)

作者： Asanka Pannipitiya Ivan D. Rukhlenko Malin Premaratne Advanced Computing and Simulation Laboratory (AXL) Department ofElectrical and Computer Systems Engineering Monash University Clayton VIC Australia

We develop approximate analytical models that describe transmission characteristics of plasmonic slot waveguides coupled to resonant-cavity structures. These models provide deeper insight and pave the way for rapid de... 详细信息

ISBN: (纸本)9780977565771

关键词： Optical waveguides Waveguide junctions Couplers Plasmons Optical filters Power transmission lines

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Optimum design of single-core nanowaveguide for surface plasmon polaritons

Optimum design of single-core nanowaveguide for surface plas...

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International Conference on Quantum Electronics (IQEC)

作者： Dayan Handapangoda Malin Premaratne Ivan D. Rukhlenko Advanced Computing and Simulation Laboratory (AxL) Department ofElectrical and Computer Systems Engineering Faculty of Engineering Monash University Clayton VIC Australia

We show that an optimal dielectric cladding thickness exists, at which the losses in a metallic nanowire can be entirely compensated with minimal gain. We also propose design guidelines that ensure strong confinement ... 详细信息

ISBN: (纸本)9780977565771

关键词： Optical surface waves Metals Dielectric losses Surface waves Integrated circuit interconnections Optical pumping

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Degree of polarization of Mie scattered stationary partially coherent electromagnetic fields

Degree of polarization of Mie scattered stationary partially...

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International Conference on Quantum Electronics (IQEC)

作者： Madara L. Marasinghe Malin Premaratne David M. Paganin Advanced Computing and Simulation Laboratory (AL) Department of Electrical and Computer Systems Engineering Faculty of Engineering Monash University Clayton VIC Australia School of Physics Faculty of Science Monash University Clayton VIC Australia

The polarization of non-paraxial partially coherent light scattered from nanospheres cannot be described easily. We utilize the degree of polarization to quantify Mie scattered partially coherent light and demonstrate... 详细信息

ISBN: (纸本)9780977565771

关键词： Polarization Lattices Electromagnetic fields Optics Coherence Dielectrics

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Design and implementation of edge detection algorithm in dsPIC embedded processor

Design and implementation of edge detection algorithm in dsP...

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International Conference on Information and Automation for Sustainability (ICIAfS)

作者： Prashan Premaratne Sabooh Ajaz Ravi Monaragala Nalin Bandara Malin Premaratne School of Electrical Computer and Telecommunications Engineering University of Wollongong North Wollongong NSW Australia Centre for Research and Development Army Cantonment Panagoda Sri Lanka Advanced Computing and Simulation Laboratory (AXL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia

The research presented here is an attempt to use a very basic, low cost and non-specialized microcontroller for image processing tasks. The applications emanating from such an attempt will result in inexpensive face detection, intelligent motion sensors to low cost vehicle counting systems. We have been able to develop a system based on Microchip dsPIC microcontroller that implements edge detection of still images. Hardware-based signal processors such as Texas Instrument DSP (Digital Signal Processing) or Field Gate Arrays (FPGA) are generally an expensive solution for image processing applications. On the other hand a conventional 8-bit microcontroller doesn't have enough capability to handle memory intensive DSP algorithms. In this regard, Microchip offers a tradeoff between cost and performance. Although performance does not compete with TI DSPs or FPGAs, the proposed system yet provides a sound platform to perform Signal processing directly on embedded hardware. Our research presents a preliminary approach to perform any type of image processing task using microchip 16-bit Microcontrollers and 16-bit digital signal controllers. Even though this attempt is aimed at Edge Detection, the research opens up possibilities for numerous other algorithms of signal and image processing that can be implemented using the same low cost hardware.

关键词： Image edge detection Hardware Cameras Noise Pixel Libraries

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Dynamic hand gesture recognition system using moment invariants

Dynamic hand gesture recognition system using moment invaria...

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International Conference on Information and Automation for Sustainability (ICIAfS)

作者： Zhengmao Zou Prashan Premaratne Ravi Monaragala Nalin Bandara Malin Premaratne School of Electrical Computer and Telecommunications Engineering University of Wollongong North Wollongong NSW Australia Centre for Research and Development Army Cantonment Panagoda Sri Lanka Advanced Computing and Simulation Laboratory (AXL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia

We have developed a dynamic hand gesture recognition system that can simplify the way humans interact with computers and many other non-critical consumer electronic equipment. The proposed system is based on the well-known “Wave Controller” technology developed at the University of Wollongong and will revolutionize video gaming and consumer electronics control interfaces. Currently, computer interfacing mainly involves keyboard, mouse, joystick or gaming wheels and occasionally voice recognition for user input. These modes of interaction have restrained the artistic ability of many users, as they are required to respond to the computer through pressing buttons or moving other apparatus. Voice recognition is seen as unreliable and impractical in areas where more than one user is present. All these drawbacks can be tackled by using a reliable hand gesture recognition system that facilitates interaction between users and computers and other consumer electronic equipment in real time. This will further enhance the user experience as users no longer have any physical connection to the equipment being controlled. This system can also be extended to a sign language system for the benefit of the disabled including those with speech disabilities.

关键词： Gesture recognition Computers Support vector machines Real time systems Classification algorithms Consumer electronics Feature extraction

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Novel directions in Raman amplifier research

Novel directions in Raman amplifier research

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International Conference on Information, Communications and Signal Processing

作者： V. Kalavally M. Premaratne I. Rukhlenko T. Win P. Shum M. Tang Department of Electrical and Compute Systems Engineering School of Engineering Monash University Bandar Sunway Selangor Darul Ehsan Malaysia Advanced Computing and Simulation Laboratory (AXL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia School of Electrical and Electronics Engineering Nanyang Technological University Singapore Singapore

ISBN: (纸本)9781424446568

Raman amplifiers provide a simple and yet powerful platform for optical amplification needs in modern optical communication networks. This paper reviews recent progress in Raman amplifier research and highlights some non-conventional future of the field. Although the low-noise and wavelength-independent gain properties of Raman amplifiers have been long exploited in optical communication networks, researchers strive to tap into the huge potential of non-linear optics to improve reach and performance. Alternative approaches used to enhance the quality of Raman amplified networks such as the use of novel pumping schemes that can ensure uniformity in gain and noise performance are discussed. Finally, the advances in research on Raman amplification in monolithically integrated silicon waveguides which should fuel wide deployment in the coming years are presented.

关键词： Stimulated emission Optical amplifiers Semiconductor optical amplifiers Optical fiber communication Performance gain Optical noise Optical waveguides Power amplifiers Low-noise amplifiers Nonlinear optics

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Multiple-scale Analysis of Optical Amplifiers

Multiple-scale Analysis of Optical Amplifiers

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IEEE PhotonicsGlobal@Singapore, IPGC

作者： Malin Premaratne Advanced Computing and Simulation Laboratory (AXL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia

Short-pulse propagation in optical amplifiers has been widely studied for applications in optical signal processing and optical communications areas. Even though it is possible to integrate differential equations numerically, such implementations may not provide adequate insight into the device operation. We propose a systematic way to construct analytical solutions under pulsed conditions and show excellent agreement with numerically integrated results. Our approach makes use of the multiple-scale technique in which different time scales associated with physical processors are cleverly used to partition amplifier response to different regions where analytical solution can be found using simple techniques.

关键词： Stimulated emission Semiconductor optical amplifiers Optical amplifiers Pulse amplifiers Optical pulses Optical signal processing Space vector pulse width modulation Optical pulse shaping Optical computing Atom optics

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Multiple scale analysis of semiconductor amplifiers

Multiple scale analysis of semiconductor amplifiers

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International Conference on advanced Optoelectronics and Lasers (CAOL)

作者： Malin Premaratne Advanced Computing and Simulation Laboratory (AXL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia

关键词： Semiconductor optical amplifiers Pulse amplifiers Optical pulses Optical pulse shaping Stimulated emission Optical signal processing Optical amplifiers Nonlinear optics Space vector pulse width modulation Computer crime

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Picosecond pulse amplification in semiconductor optical amplifiers: A multiple-scale analysis

Picosecond pulse amplification in semiconductor optical ampl...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Malin Premaratne Govind P. Agrawal Advanced Computing and Simulation Laboratory (AcL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia Institute of Optics University of Rochester Rochester NY USA

We propose a systematic way for analyzing gain-recovery dynamics in semiconductor optical amplifiers using a multiple-scale analysis and show that the resulting analytical solution for the amplified pulse agrees well ... 详细信息

ISBN: (纸本)9781557528599

关键词： Optical pulses Pulse amplifiers Semiconductor optical amplifiers Optical pulse shaping Stimulated emission Charge carrier density Optical computing Modeling Space vector pulse width modulation Equations

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De novo ultrascale atomistic simulations on high-end parallel supercomputers

De novo ultrascale atomistic simulations on high-end paralle...

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作者： Nakano, Aiichiro Kalia, Rajiv K. Nomura, Ken-Ichi Sharma, Ashish Vashishta, Priya Shimojo, Fuyuki van Duin, Adri C.T. Goddard III, William Biswas, Rupak Srivastava, Deepak Yang, Lin H. Collaboratory for Advanced Computing and Simulations University of Southern California Los Angeles CA 90089-0242 United States Department of Biomedical Informatics Ohio State University Columbus OH 43210 United States Department of Physics Kumamoto University Kumamoto 860-8555 Japan Materials and Process Simulation Center California Institute of Technology Pasadena CA 91125 United States Division NASA Amesresearch Center Moffett Field CA 94035 United States Physics/HDivision Lawrence Livermore National Laboratory Livermore CA 94551 United States

We present a de novo hierarchical simulation framework for first-principles based predictive simulations of materials and their validation on high-end parallel supercomputers and geographically distributed clusters. In this framework, high-end chemically reactive and non-reactive molecular dynamics (MD) simulations explore a wide solution space to discover microscopic mechanisms that govern macroscopic material properties, into which highly accurate quantum mechanical (QM) simulations are embedded to validate the discovered mechanisms and quantify the uncertainty of the solution. The framework includes an embedded divide-and-conquer (EDC) algorithmic framework for the design of linear-scaling simulation algorithms with minimal bandwidth complexity and tight error control. The EDC framework also enables adaptive hierarchical simulation with automated model transitioning assisted by graph-based event tracking. A tunable hierarchical cellular decomposition parallelization framework then maps the O(N) EDC algorithms onto petaflops computers, while achieving performance tunability through a hierarchy of parameterized cell data/ computation structures, as well as its implementation using hybrid grid remote procedure call + message passing + threads programming. High-end computing platforms such as IBM BlueGene/L, SGI Altix 3000 and the NSF TeraGrid provide an excellent test grounds for the framework. On these platforms, we have achieved unprecedented scales of quantum-mechanically accurate and well validated, chemically reactive atomistic simulations-1.06 billion-atom fast reactive force-field MD and 11.8 million-atom (1.04 trillion grid points) quantum-mechanical MD in the framework of the EDC density functional theory on adaptive multigrids- in addition to 134 billion-atom non-reactive space-time multiresolution MD, with the parallel efficiency as high as 0.998 on 65,536 dual-processor BlueGene/L nodes. We have also achieved an automated execution of hierarchical QM/MD

关键词： Supercomputers

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