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Hardware Reuse in Modern Application-Specific Processors and Accelerators

Hardware Reuse in Modern Application-Specific Processors and...

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Euromicro Symposium on Digital System Design

作者： Alexandre S. Nery Lech Jozwiak Menno Lindwer Mauro Cocco Nadia Nedjah Felipe M.G. Franca LAM-Computer Architecture and Microelectronics Laboratory Systems Engineering and Computer Science Program COPPE Universidade Federal do Rio de Janeiro Brazil Department of Electrical Engineering-Electronic Systems Eindhoven University of Technology Netherlands Silicon Hive-Intel UMG Netherlands Department of Electronics Engineering and Telecommunications-Faculty of Engineering Universidade do Estado do Rio de Janeiro Brazil

Effective exploitation of the application-specific parallel patterns and computation operations through their direct implementation in hardware is the base for construction of high-quality application-specific (re-)configurable application specific instruction set processors (ASIPs) and hardware accelerators for modern highly-demanding applications. Although it receives a lot of attention from the researchers and practitioners, a very important problem of hardware reuse in ASIP and accelerator synthesis is clearly underestimated and does not get enough attention in the published research. This paper is an effect of an industry and academic collaborative research. It analyses the problem of hardware sharing, shows its high practical relevance, as well as a big influence of hardware sharing on the major circuit and system parameters, and its importance for the multi-objective optimization and tradeoff exploitation. It also demonstrates that the state-of-the-art synthesis tools do not sufficiently address this problem and gives several guidelines related to enhancement of the hardware reuse.

关键词： Hardware Resource management computer architecture Optimization program processors Adders Delay

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Supervised Learning Framework For Screening Nuclei in Tissue Sections

Supervised Learning Framework For Screening Nuclei in Tissue...

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

作者： Kaustav Nandy Prabhakar R. Gudla Ryan Amundsen Karen J. Meaburn Tom Misteli Stephen J. Lockett Optical Microscopy and Analysis Laboratory Advanced Technology program SAIC-Frederick Inc. Electrical Engineering and Computer Science Department University of Michigan Cell Biology of Gene Expression National Cancer Institute National Institutes of Health

ISBN: (纸本)9781424441211

Accurate segmentation of cell nuclei in microscope images of tissue sections is a key step in a number of biological and clinical applications. Often such applications require analysis of large image datasets for which manual segmentation becomes subjective and time consuming. Hence automation of the segmentation steps using fast, robust and accurate image analysis and pattern classification techniques is necessary for high throughput processing of such datasets. We describe a supervised learning framework, based on artificial neural networks (ANNs), to identify well-segmented nuclei in tissue sections from a multistage watershed segmentation algorithm. The successful automation was demonstrated by screening over 1400 well segmented nuclei from 9 datasets of human breast tissue section images and comparing the results to a previously used stacked classifier based analysis framework.

关键词： tissue section Cell nucleus Semi-supervised Learning Nucleus Dataset image analysis MULTISTAGE Artificial neural networks Frameworks nuclei (nuclear physics) segmentation Segmentation Automation pattern classification method

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Microfluidic flow cytometer utilizing optical space-time coding technique

Microfluidic flow cytometer utilizing optical space-time cod...

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IEEE Photonics Conference (IPC)

作者： Tsung-Feng Wu Zhe Mei Luca Pion-Tonachini Yu-Hwa Lo Materials Science and Engineering Program University of California at San Diego La Jolla CA USA School of Information and Electronics Beijing Institute of Technology Beijing China Department of Electrical and Computer Engineering University of California at San Diego La Jolla CA USA

An optical-coding technique for microfluidic flow cytometers to detect forward scattering and large angle scattering signals that can be used to differentiate beads and cells.

关键词： Optical scattering Microfluidics Optical sensors Optical signal processing Optical device fabrication Biomedical optical imaging

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Metamorphic solar cells employing chemical mechanical polishing and MOVPE regrowth

Metamorphic solar cells employing chemical mechanical polish...

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2011 37th IEEE Photovoltaic Specialists Conference

作者： L. J. Mawst P. Dudley J. Kirch T. Kim S. Ruder T. F. Kuech R. Tatavarti Department of Electrical and Computer Engineering University of Wisconsin-Madison Madison WI USA Materials Science Program University of Wisconsin-Madison Madison WI USA Department of Chemical and Biological Engineering University of Wisconsin-Madison Madison WI USA Microlink Devices Inc. Niles IL USA

We have investigated the MOVPE growth of In x Ga 1-x As metamorphic buffer layer (MBL) structures with a focus on techniques to improve the surface morphology and determine the influence of morphology on subsequently grown single-junction device structures. To improve the surface roughness of the underlying MBL, Chemical-Mechanical Polishing (CMP) is employed and MOVPE regrowth of single-junction (SJ) solar cells on top of the polished surface is performed. AFM image analysis indicates the CMP process is effective in reducing the step-graded In x Ga 1-x As MBL surface roughness from ~7-10 nm (as-grown) to 2.3 nm post CMP. A post-CMP ozone/HF treatment was found to be effective in removing silica residue remaining on the surface from the CMP process, allowing for the growth of films on top of the MBL surface subjected to CMP. Improved short circuit current density (J sc ) and external quantum efficiency (QE) were obtained from SJ (1eV) devices which employ the CMP process compared with those on as-grown MBLs.

关键词： Surface roughness Rough surfaces Surface treatment Surface morphology Indium gallium arsenide Epitaxial layers Epitaxial growth

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A Parallel Ray Tracing Architecture Suitable for Application-Specific Hardware and GPGPU Implementations

A Parallel Ray Tracing Architecture Suitable for Application...

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Euromicro Symposium on Digital System Design

作者： Alexandre S. Nery Nadia Nedjah Felipa M.G. Franca Lech Jozwiak LAM-Computer Architecture and Microelectronics Laboratory Systems Engineering and Computer Science Program COPPE Universidade Federal do Rio de Janeiro Brazil Department of Electrical Engineering-Electronic Systems Eindhoven University of Technology Netherlands Universidade do Estado do Rio de Janeiro Rio de Janeiro RJ BR

The Ray Tracing rendering algorithm can produce high-fidelity images of 3-D scenes, including shadow effects, as well as reflections and transparencies. This is currently done at a processing speed of at most 30 frames per second. Therefore, actual implementations of the algorithm are not yet suitable for interactive real-time rendering, which is required in games and virtual reality based applications. Fortunately, the algorithm allows for massive parallelization of its computations. In this paper, we present a parallel architecture for ray tracing based on a uniform spatial subdivision of the scene and exploiting an embedded computation of ray-triangle intersections. This approach allows for a significant acceleration of intersection computations, as well as, a reduction of the total number of the required intersections checks. Furthermore, it allows for these checks to be performed in parallel and in advance for each ray. In this paper we discuss and analyze an ASIP-based implementation using FPGAs and a GPGPU-based parallel implementation of the proposed architecture. The performance of both implementations are reported and compared.

关键词： Ray tracing Graphics processing unit Instruction sets computer architecture Registers Image color analysis Hardware

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Reducing time delays on congested road networks using social navigation

Reducing time delays on congested road networks using social...

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IEEE Forum on Integrated and Sustainable Transportation System (FISTS)

作者： Alje van den Bosch Bart van Arem Mohamed Mahmod James Misener Department of Applied Mathematics Faculty of Electrical Engineering Mathematics and Computer Science University of Twente Netherlands Partners for Advanced Transit and Highways (PATH) program University of California Berkeley USA Department of Transport and Planning at the Faculty of Civil Engineering and Geosciences Delft University of Technnology Netherlands Centre of Transport Studies Faculty of Engineering University of Twente Enschede Netherlands

Social navigation provides drivers with an advice that aims to shift traffic flows in a network from a user equilibrium to a system optimum. The advice is based on minimizing a combination of the individual travel time and the marginal total travel time in the network. The level of altruism defines the extent to which a driver is willing to sacrifice his own travel time in favor of other drivers. Fuel consumption and CO2 emission are taking into account by converting them into time equivalent. Experimental results for a small network loosely representing the Bay area show that social navigation can reduce time delays by 10%. The reduction is positively correlated with network load, market penetration and level of altruism.

关键词： Navigation Driver circuits Vehicles Fuels Vehicle dynamics Roads Approximation methods

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SQUARAINE DONORS FOR HIGH EFFICIENCY SMALL MOLECULE SOLAR CELLS

SQUARAINE DONORS FOR HIGH EFFICIENCY SMALL MOLECULE SOLAR CE...

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IEEE Photovoltaic Specialists Conference

作者： Guodan Wei Siyi Wang Xin Xiao C. Kyle Renshaw Lincoln Hall Vyacheslav V. Diev Mark E. Thompson Stephen R. Forrest Department of Materials Science and Engineering University of Michigan Department of Chemistry University of Southern California Department of Electrical Engineering and Computer Science University of Michigan Applied Physics Program University of Michigan

ISBN: (纸本)9781424499663

It has been a challenge to achieve high efficiency organic photovoltaics (OPV) that absorb long wavelength solar radiation without incurring unacceptable reductions in open circuit voltage (V_(oc)) or charge separation efficiency. Based on the parent structure of the 2, 4-bis[4-(N, N-diisobutylamino)-2,6-dihydroxyphenyl] squaraine (SQ), we have increased V_(oc) using a family of highly near-infrared absorbing SQs, achieving values as high as 0.94 V. These SQ donors are: 2, 4-bis[4-(N-Phenyl-1-naphthylamino)-2,6-dihydroxyphenyl] squaraine (1-NPSQ),2,4-bis[4-(N,N-diphenylamino)-2,6 dihydroxyphenyl] squaraine (DPSQ), 2,4-bis[4-(N,N-diphenylamino)-2,6-dihydroxyphenyl] asymmetric squaraine (DPASQ). The spin-cast SQ, 1-NPSQ, DPSQ and DPASQ donors are then coated with the acceptor C_(60) to form bulk heterojunction (BHJ) solar cells that take advantage of their exceptionally high absorption coefficient and nanocrystalline morphology to overcome the short diffusion length characteristic of these materials. Combined with a high short-circuit current density (J_(sc)=10.6 mA/cm~2) and high fill factor (FF=0.64), the optimized 1-NPSQ/C_(60) photovoltaic cells with 1-NPSQ annealed at elevated temperature have a power conversion efficiency of η_p as high as 6.0% (correcting for solar mismatch) at 1 sun (AM 1.5G) simulated solar illumination, which to our knowledge is the highest efficiency reported to date for small molecule OPVs.

关键词： Photovoltaic cells Absorption Annealing Educational institutions Sun USA Councils Heterojunctions

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Handling Failures of Static Sensor Nodes in Wireless Sensor Network by Use of Mobile Sensors

Handling Failures of Static Sensor Nodes in Wireless Sensor ...

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International Conference on Advanced Information Networking and Applications Workshops (AINAW)

作者： Edison Pignaton de Freitas Tales Heimfarth Ivayr Farah Netto Carlos Eduardo Pereira Armando Morado Ferreira Flavio Rech Wagner Tony Larsson IDE Halmstad University Halmstad Sweden Institute of Informatics Federal University of Rio Grande do Sul Porto Alegre Brazil Computer Science Department Federal University of Lavras Lavras Brazil Electrical Engineering Department Federal University of Rio Grande do Sul Porto Alegre Brazil Defense Engineering Graduate Program Military Institute of Engineering Rio de Janeiro Brazil

Node failures in Wireless Sensor Networks composed by static sensor nodes are common due to the nature of the sensor devices and the usually harsh environments in which they are deployed. Node failures can diminish the performance of the network as a whole, thus affecting its functionality in delivering the desired services. For instance, significant regions can become uncovered due to failure of several nearby nodes. This paper reports a study about the use of mobile sensor nodes acting in cooperation with static ones in order to fill gaps created by faulty static nodes. The proposed fault handling mechanism presents alternative policies with pros and cons, depending on the user priorities imposed to the system and the occurrence of failures. A discussion about this topic is presented based on results obtained by simulation of the proposed mechanisms.

关键词： Wireless sensor networks Mobile communication Surveillance Redundancy Sensors Proposals

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Noise-based information processing

Noise-based information processing

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International Conference on Noise and Fluctuations (ICNF)

作者： Laszlo B. Kish Sunil P. Khatri Sergey M. Bezrukov Ferdinand Peper Zoltan Gingl Tamas Horvath Department of Electrical and Computer Engineering Texas A and M University USA Laboratory of Physical and Structural Biology Program in Physical Biology NICHD National Institutes of Health DHHS Bethesda MD USA National Institute of Information and Communications Technology Kobe Japan Department of Experimental Physics University of Szeged Szeged Hungary Department of Computer Science University of Bonn Germany Schloss Birlinghoven Fraunhofer IAIS Sankt Augustin Germany

We briefly introduce noise-based logic. After describing the main motivations we outline classical, instantaneous (squeezed and non-squeezed), continuum, spike and random-telegraph-signal based schemes with applicatio... 详细信息

关键词： Logic gates Noise Power dissipation Multivalued logic Neurons Hardware computers

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Characteristics of Step-Graded In_xGa_(1-x)As and InGaP_ySb_(1-y) Metamorphic Buffer Layers on GaAs Substrates

Characteristics of Step-Graded In_xGa_(1-x)As and InGaP_ySb_...

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Compound Semiconductor Week

作者： J. Kirch P. Dudley T. Kim K. Radavich S. Ruder L. J. Mawst T. F. Kuech S. D. LaLumondiere Y. Sin W. T. Lotshaw S. C. Moss Department of Electrical and Computer Engineering University of Wisconsin - Madison Materials Science Program University of Wisconsin - Madison Department of Chemical and Biological Engineering University of Wisconsin - Madison Electronics and Photonics Lab The Aerospace Corporation

ISBN: (纸本)9781457717536

Step-graded InGaP_ySb_(1-y) and In_xGa_(1-x)As metamorphic buffer layer (MBL) structures are grown on GaAs substrates by metal-organic chemical vapor deposition (MOCVD). AFM analysis indicates that graded group V InGaP_ySb_(1-y) MBLs exhibit significantly lower surface roughness (～4.7nm) compared with more conventional graded group III In_xGa_(1-x)As MBLs, which typically have rms surface roughness in the range of 7-14nm. To reduce the surface roughness of the In_xGa_(1-x)As MBL, a post growth Chemical-Mechanical Polishing (CMP) procedure is implemented. AFM image analysis indicates the CMP process is effective in reducing the step-graded In_xGa_(1-x)As MBL surface roughness from ～7.3 nm (as-grown) to 2.3 nm post CMP. Preliminary studies indicate that bulk InGaAs layers regrown on top of the MBL subjected to CMP exhibit improved static and transient PL characteristics compared with those deposited on as-grown MBLs.

关键词： III-V semiconductors Defects Optical devices

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