Search results for "Difference-map algorithm"

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Architectural improvements and FPGA implementation of a multimodel neuroprocessor

2003

Since neural networks (NNs) require an enormous amount of learning time, various kinds of dedicated parallel computers have been developed. In the paper a 2-D systolic array (SA) of dedicated processing elements (PEs) also called systolic cells (SCs) is presented as the heart of a multimodel neural-network accelerator. The instruction set of the SA allows the implementation of several neural algorithms, including error back propagation and a self organizing feature map algorithm. Several special architectural facilities are presented in the paper in order to improve the 2-D SA performance. A swapping mechanism of the weight matrix allows the implementation of NNs larger than 2-D SA. A systo…

Instruction setArtificial neural networkComputer architectureComputer scienceFeature (machine learning)Systolic arrayParallel computingDifference-map algorithmField-programmable gate arrayBackpropagationWord (computer architecture)Proceedings of the 9th International Conference on Neural Information Processing, 2002. ICONIP '02.
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Optimization of a Time-to-Digital Converter and a coincidence map algorithm for TOF-PET applications

2015

This contribution describes the optimization of a multichannel high resolution Time-to-Digital Converter (TDC) in a Field-Programmable Gate Array (FPGA) initially capable of obtaining time resolutions below 100ps for multiple channels. Due to its fast propagation capability it has taken advantage of the FPGA internal carry logic for accurate time measurements. Furthermore, the implementation of the TDC has been performed in different clock regions and tested with different frequencies as well, achieving improvements of up to 50% for a pair of channels. Moreover, since the TDC is potentially going to be used in a trigger system for Positron Emission Tomography (PET), the algorithm for coinci…

business.industryComputer scienceCarry (arithmetic)High resolutionCoincidenceTime-to-digital converterIdentification (information)Hardware and ArchitectureGate arraybusinessDifference-map algorithmField-programmable gate arraySoftwareComputer hardwareJournal of Systems Architecture
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