High-speed photonic reservoir computer based on a delayed Fano laser under electrical modulation

2021 ◽  
Author(s):  
YU HUANG ◽  
Pei Zhou ◽  
Yigong Yang ◽  
Nianqiang Li
Keyword(s):  
High Speed ◽  
Electrical Modulation ◽  
Computer Based

scholarly journals NanoLEDs for energy-efficient and gigahertz-speed spike-based sub-λ neuromorphic nanophotonic computing

Nanophotonics ◽  
2020 ◽  
Vol 9 (13) ◽  
pp. 4149-4162 ◽  
Author(s):  
Bruno Romeira ◽  
José M. L. Figueiredo ◽  
Julien Javaloyes
Keyword(s):  
Neural Networks ◽  
Energy Efficient ◽  
High Speed ◽  
Dynamic Properties ◽  
Optical Computing ◽  
Differential Conductance ◽  
Rate Equations ◽  
Dynamical Equations ◽  
Electrical Modulation ◽  
High Bandwidth

AbstractEvent-activated biological-inspired subwavelength (sub-λ) photonic neural networks are of key importance for future energy-efficient and high-bandwidth artificial intelligence systems. However, a miniaturized light-emitting nanosource for spike-based operation of interest for neuromorphic optical computing is still lacking. In this work, we propose and theoretically analyze a novel nanoscale nanophotonic neuron circuit. It is formed by a quantum resonant tunneling (QRT) nanostructure monolithic integrated into a sub-λ metal-cavity nanolight-emitting diode (nanoLED). The resulting optical nanosource displays a negative differential conductance which controls the all-or-nothing optical spiking response of the nanoLED. Here we demonstrate efficient activation of the spiking response via high-speed nonlinear electrical modulation of the nanoLED. A model that combines the dynamical equations of the circuit which considers the nonlinear voltage-controlled current characteristic, and rate equations that takes into account the Purcell enhancement of the spontaneous emission, is used to provide a theoretical framework to investigate the optical spiking dynamic properties of the neuromorphic nanoLED. We show inhibitory- and excitatory-like optical spikes at multi-gigahertz speeds can be achieved upon receiving exceptionally low (sub-10 mV) synaptic-like electrical activation signals, lower than biological voltages of 100 mV, and with remarkably low energy consumption, in the range of 10–100 fJ per emitted spike. Importantly, the energy per spike is roughly constant and almost independent of the incoming modulating frequency signal, which is markedly different from conventional current modulation schemes. This method of spike generation in neuromorphic nanoLED devices paves the way for sub-λ incoherent neural elements for fast and efficient asynchronous neural computation in photonic spiking neural networks.

Correlation between computer-based simulation model and practice of high-speed laser welding of polycarbonate

2010 ◽  
Author(s):  
Heidi Piili ◽  
Lauri Taimisto ◽  
Tuomas Purtonen ◽  
Saara Ruotsalainen ◽  
Petri Laakso ◽  
...  
Keyword(s):  
Laser Welding ◽  
Simulation Model ◽  
High Speed ◽  
Computer Based

Whirl of High-Speed Rotors Driven by Dry or Lubricated Rollers

1985 ◽  
Vol 107 (2) ◽  
pp. 312-319
Author(s):  
S. Wang ◽  
A. Seireg
Keyword(s):  
Coefficient Of Friction ◽  
Dynamic Load ◽  
High Speed ◽  
Contact Forces ◽  
Contact Compliance ◽  
Computer Based ◽  
Load Conditions

This paper presents a computer-based simulation of the vibration and dynamic load conditions in rotors driven by dry or lubricated Hertzian contacts. The effect of clearance coefficient of friction, elastohydrodynamic film, number of drive rollers, and contact compliance on the rotor movement and the contact forces is investigated.

Modelling of Recrystallisation Kinetics and Texture during the Thermo-Mechanical Processing of Aluminium Sheets

2005 ◽  
Vol 495-497 ◽  
pp. 555-566 ◽  
Author(s):  
Olaf Engler ◽  
L. Löchte ◽  
Kai F. Karhausen
Keyword(s):  
Crystallographic Texture ◽  
Rolling Mill ◽  
High Speed ◽  
Process Development ◽  
Process Models ◽  
Mechanical Processing ◽  
Recent Developments ◽  
Computer Based ◽  
Aluminium Sheets ◽  
Evolution Of Microstructure

Computer-based alloy and process development requires integration of models for simulating the evolution of microstructure, microchemistry and crystallographic texture into process models of the thermo-mechanical production of Al sheet. The present paper focuses on recent developments in linking softening modules that simulate the progress of recovery and recrystallisation with the following texture changes to deformation and microchemistry models. The potential of such coupled simulations is illustrated by way of the thermo-mechanical processing of Al-Mg-Mn alloys. In particular, the progress of recrystallisation during coil cooling (“self-annealing”) as well as the texture differences between production on a reversible rolling mill and a high-speed tandem line are explored.

scholarly journals Wire Laying Methods as an Alternative to Multilayer PCB's

1984 ◽  
Vol 11 (2) ◽  
pp. 117-122
Author(s):  
G. Messner ◽  
P. Plonski ◽  
A. Martens
Keyword(s):  
Integrated Circuit ◽  
High Speed ◽  
Impedance Control ◽  
Vlsi Circuits ◽  
High Density ◽  
Large Numbers ◽  
Design And Manufacturing ◽  
Computer Based ◽  
Board Performance ◽  
Circuit Technology

The rapid growth of integrated circuit technology, culminating in VLSI circuits, is responsible for the proliferation of new, surface mountable device packages with large numbers of input-output terminals. Conventional printed circuit or multilayer techniques have been driven to the technological edge in the effort to interconnect these new types of packages. Because the etched conductors can be replaced with fine, insulated wires, automated high density discrete wiring techniques can provide easier high density interconnections and with shorter turn-around times. Among the dozen or so presently available discrete wiring techniques, the fastest growing is Multiwire®. Multiwire is a computer based design and manufacturing system, where special machines are precisely laying down polyimide insulated wires over adhesive coated substrates having etched power and ground planes. The finished boards exhibit microstrip characteristics, providing impedance control for high speed applications. The manufacturing process and Multiwire board performance capabilities are described in this paper.

Real-Time Virtual Instrument Platform Based on Multi-Thread Technique

2012 ◽  
Vol 468-471 ◽  
pp. 2903-2907
Author(s):  
Meng Lun Tao ◽  
Ding Fang Chen ◽  
Quan Guo Lu ◽  
Liang Shu ◽  
Ya Peng Zhao
Keyword(s):  
Virtual Instrument ◽  
High Speed ◽  
Processing Efficiency ◽  
Single Thread ◽  
Thread Pool ◽  
Computer Based ◽  
High Speed Data ◽  
Task Processing ◽  
And Control

In Virtual instrument (VI) established for computer based automated test and control, the process with only single thread has limits when developed for acquiring high speed data, analyzing and displaying them the meaning while. Any interference from another task may block the whole running process and cause data missing. In order to increase the throughput, responding time and multi-task processing efficiency of VI, multi-thread programming with the platform LabWindows/CVI is introduced in this paper. Contents include the two strategies to establish multi-thread program, Thread pool and Asynchronous Timer, and how to protect data with multi-thread programming. Finally, a case study showed a multi-thread VI based on Asynchronous Timer method, with the comparison of performance between single thread and multi-thread program.

PENGEMBANGAN MODEL COMPUTER-BASED E-LEARNING UNTUK MENINGKATKAN KEMAMPUAN HIGH ORDER MATHEMATICAL THINKING SISWA SMA

2011 ◽  
Vol 16 (2) ◽  
pp. 71
Author(s):  
Jarnawi Afgani Dahlan ◽  
Yaya Sukjaya Kusumah ◽  
Mr Heri Sutarno
Keyword(s):  
High Speed ◽  
Teaching And Learning ◽  
Mathematical Thinking ◽  
Computer Software ◽  
High Order ◽  
Learning Activity ◽  
Second Phase ◽  
E Learning ◽  
Computer Based ◽  
The Impact

The focus of this research is on the development of mathematics teaching and learning activity which is based on the application of computer software. The aim of research is as follows : 1) to identify some mathematics topics which feasible to be presented by computer-based e-learning, 2) design, develop, and implement computer-based e-learning on mathematics, and 3) analyze the impact of computer-based e-learning in the enhancement of SMA students’ high order mathematical thinking. All activity in this research achieved in 2 phases. In the first phase, the following activities are conducted: analysis theoretically topics which are difficult to be delivered by conventional methods, need too many repetitions, need high accuracy, need high speed process, and can be presented more interestingly. In the second phase, the following activities are conducted: designing, developing, and implementing a number of teaching and research instruments; implementing computer-based e-learning on mathematics for SMA students’, and analyzing the impact of computer-based e-learning in the enhancement of SMA students’ high- order mathematical thinking. Key words: computer-based e-learning model, high-order mathematical thinking

Comparison of VHS video recording system with Apple Macintosh-based image analysis and modified CODA-3 systems in equine motion analysis

2002 ◽  
Vol 50 (2) ◽  
pp. 167-176 ◽  
Author(s):  
F. Szalay ◽  
W. Back ◽  
A. Barneveld ◽  
Keyword(s):  
Image Analysis ◽  
Motion Analysis ◽  
High Speed ◽  
Sampling Rate ◽  
Video Recording ◽  
Lateral View ◽  
Video Recordings ◽  
Artificial Illumination ◽  
Computer Based ◽  
Analysis System

A VHS video - computer-based image analysis combination is described as a low sampling rate motion analysis system. Video recordings were taken indoor without any artificial illumination at 25 fps sampling rate. The horse studied was running on a high-speed treadmill and observed at 1.6, 4 and 7 m/s velocities at walk, trot and canter, respectively. Left forelimb and hindlimb were recorded separately from lateral view. For comparison, parallel CODA-3 recordings were taken at the same time from the same position. Joint angles were expressed and compared in angle-time diagrams. Sampling of both systems has been synchronised by a timer device at ± 1/300 s error level. Results obtained with the two different recording systems were comparable in all joints measured with the exception of the fetlock. Inaccuracies in fetlock recordings are thought to be eliminated by measuring at controlled illumination. As a conclusion, the VHS-Macintosh setup appears to be promising as a simplified system for gait analysis.

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