Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 19 of 19 for “"forward propagation"”.
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Enhanced Neural Network Training Using Selective Backpropagation and Forward Propagation
… measures to determine when to backpropagate and forward propagate in order to reduce training time while maintaining classification performance. This thesis tests these new algorithms on the MNIST and CASIA datasets, and achieves successful results with both algorithms on the two datasets. The …
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Forward scattering of a pulsed continuous wave signal through laminar and turbulent thermal plumes
The results of an experiment examining the forward propagation or an acoustic signal through a buoyant plume are discussed. Two distinct testing sights were used. One made use of a small fresh water tank in NUWC to provide a controlled plume. The other used a larger salt water tank at WHOI to …
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Prediction of the beamformed acoustic ray arrival structure for the 1992 Barents Sea coastal tomography test
In an effort to solve the forward propagation problem associated with the 1992 Barents Sea Polar Front Experiment Tomography Test, the transmission of a 224 Hz pulse signal from a near bottom sound source to a vertical hydrophone array was simulated based on three-dimensional ray theory. based on …
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Learning Hyperparameters for Inverse Problems by Deep Neural Networks
… parameters for newly-obtained data by forward propagation through the DNNs. The network-obtained regularization parameters can be computed more efficiently and may even lead to more accurate solutions compared to existing regularization parameter selection methods. Numerical results for …
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Efficient multidimensional uncertainty quantification of high speed circuits using advanced polynomial chaos approaches
… integrated microsystems. Hence, modeling the forward propagation of uncertainty from the device-level parameters to the system-level response of high-speed circuits and systems forms a crucial requirement of modern computer-aided design (CAD) tools. This thesis presents novel approaches based …
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A learning method for the approximation of discontinuous functions for stochastic simulations
… that allow expensive analyses, such as the forward propagation of uncertainty and Bayesian statistical inference, to be performed efficiently. When a simulation output does not depend smoothly on its inputs, however, most existing surrogate construction methodologies yield large errors and …
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A three-dimensional coupled modes solution for range-dependent waveguides
… it can be efficiently solved by noniterative forward marching techniques. However, any form of the parabolic equation is an approximate wave equation derived under the assumptions of: (1) forward propagation only, and (2) that energy is propagating within a limited angular spectrum around the …
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Rough Surface Scattering and Propagation over Rough Terrain in Ducting Environments
The problem of rough surface scattering and propagation over rough terrain in ducting environments has been receiving considerable attention in the literature. One popular method of modeling this problem is the parabolic wave equation (PWE) method. In this method, the Helmholtz wave equation is …
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New biophysical methods for the characterization of signal transfer in neurons
… distance of synapses. Action potential propagation in dendrites links information processing in different regions of the dendritic tree. In simulations using compartmental models with identical complements of voltage-gated channels, different dendritic branching patterns caused a range …
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Analysis of acoustic propagation in the region of the New England continental shelfbreak
… explaining the properties of acoustic propagation in the region, and tomographic inversion of the acoustic data. In addition, this thesis develops a new method for predicting acoustic coherence in such regions. Receptions from two 400 Hz tomography sources, transmitting from the …
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All-optical ultrafast switches based on thin film coated-tilted fiber Bragg grating
… tilted fiber Bragg gratings (TFBG), coupling the forward propagation core mode to hundreds of discrete backward propagation cladding modes provide a novel platform for light-matter interaction by modulation of material permittivity via the evanescent field of cladding modes which in turn modulate …
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Analysis of acoustic propagation in the region of the New England continental shelfbreak
… explaining the properties of acoustic propagation in the region, and tomographic inversion of the acoustic data. In addition, this thesis develops a new method for predicting acoustic coherence in such regions. Receptions from two 400 Hz tomography sources, transmitting from the …
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Wavefront Engineering and Computational Sensing with Acoustic Metamaterials
… and phase acoustic holograms, control the propagation or the states of existence of acoustic waves. The second kind focuses on a reciprocal process—instead of controlling the forward propagation, the sensing signals are modulated with randomized resonant metamaterials to realize computation …
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ACCELERATING DNN INFERENCE AND TRAINING IN DISTRIBUTED SYSTEMS
… DNN inference typically runs a single round of forward propagation on the DNN model, the inference time for large DNN models is still intolerable for time-sensitive applications in mobile devices. We propose to reduce the DNN inference and training time for mobile distributed systems. To …
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New techniques for multiple wavelength fiber laser generation based on edfa and tdfa
… is 10 m and the residual waves exist in the forward propagation. These findings successfully generate up to 10 Stokes lines. The second research work is related to an experimental study on the four-wave mixing cascades (FWMC) seeded by a BEFL. In the experiment, the Brillouin pump (BP) …
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Novel angular and frequency manipulation of light in nano-scaled dielectric photonic systems
… of magnitude faster and power efficient in forward propagation than conventional neural nets.
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A decomposition-based approach to uncertainty quantification of multicomponent systems
… focuses on uncertainty analysis, also known as forward propagation of uncertainties, and sensitivity analysis. We present an approach for decomposing the uncertainty analysis task amongst the various components comprising a feed-forward system and synthesizing the local uncertainty analyses into …
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Quantification and propagation of nuclear data uncertainties
The use of several uncertainty quantification and propagation methodologies is investigated in the context of the prompt fission neutron spectrum (PFNS) uncertainties and its impact on critical reactor assemblies. First, the first-order, linear Kalman filter is used as a nuclear data evaluation and …
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Fast superresolution based on a network structure trained using sparse coding
… that signal. The testing part is based on the forward-propagation which is similar to the ISTA network structure. The learning part of the network encoder is however based on a back-propagation model and uses the stochastic-gradient descent method. The error function is the difference between …