نتایج جستجو برای: namely tikhonov regularization and truncated singular value decomposition tsvd

تعداد نتایج: 16922620  

Journal: :Physics in medicine and biology 2003
Chao Liu Yuanmei Wang Pheng Ann Heng

For good image quality using ultrasound inverse scattering, one alternately solves the well-posed forward scattering equation for an estimated total field and the ill-posed inverse scattering equation for the desired object property function. In estimating the total field, error or noise contaminates the coefficients of both matrix and data of the inverse scattering equation. Previous work on i...

2010
Xinhai Liu Lieven De Lathauwer Frizo A. L. Janssens Bart De Moor

We present a hybrid clustering algorithm of multiple information sources via tensor decomposition, which can be regarded an extension of the spectral clustering based on modularity maximization. This hybrid clustering can be solved by the truncated higher-order singular value decomposition (HOSVD). Experimental results conducted on the synthetic data have demonstrated the effectiveness. keyword...

Journal: :Journal of Quantitative Spectroscopy & Radiative Transfer 2021

Absorption spectroscopy is traditionally used to determine the average gas temperature and species concentration along laser line-of-sight by measuring magnitude of two or more absorption transitions with different dependence. Previous work has shown that nonlinear dependence strength each transition, set lower-state energy, E", can be infer variations line-of-sight. In principle, broader bandw...

2010
Peter Benner André Schneider

The reduction of parasitic linear subcircuits is one of many issues in model order reduction (MOR) for VLSI design. This issue is well explored, but recently the incorporation of subcircuits from different modelling sources into the circuit model has led to new structural aspects: so far, the number of elements in the subcircuits was significantly larger than the number of connections to the wh...

2007
Haesun Park Barry L. Drake Sangmin Lee Cheong Hee Park

Linear Discriminant Analysis (LDA) is among the most optimal dimension reduction methods for classification, which provides a high degree of class separability for numerous applications from science and engineering. However, problems arise with this classical method when one or both of the scatter matrices is singular. Singular scatter matrices are not unusual in many applications, especially f...

1999
Gene H. Golub

An alphabetic and mnemonic system of names for several matrix decompositions related to the singular value decomposition is proposed: the OSVD, PSVD, QSVD, RSVD, SSVD, TSVD. The main purpose of this note is to propose a standardization of the nomenclature and the structure of these matrix decompositions. 1 I n t r o d u c t i o n . The ordinary singular value decomposition (OSVD) has become an ...

Journal: :Journal of X-ray science and technology 2009
Marian Manciu Felicia S Manciu Teodor Vulcan Elena Nes Robert G Waggener

Megavoltage X-ray sources are commonly used for therapy planning, and knowledge of their spectral distribution is important for accurate dose calculations. There are many methods that could provide reasonable estimations of Megavoltage X-ray spectra, when very accurate attenuation data or at least very good set of initial guesses of the spectra are available. We present here a novel method, whi...

Journal: :فیزیک زمین و فضا 0
محمدعلی شریفی پردیس دانشکده های فنی، دانشگاه تهران- استادیار بابک امجدی پرور پردیس دانشکده های فنی، دانشگاه تهران- دانشجوی کارشناسی ارشد موسی شیبانی پردیس فنی دانشگاه تهران- دانشجوی کارشناسی ارشد

rational functions are of great interest to engineers and geoscientists. the rational polynomial coefficient (rpc) model as a generalized sensor model has been introduced as an alternative for the rigorous sensor model of the satellite imaging. numerical instability of normal equations is the only single obstacle to the implementation of these functions. practically, estimating rational functio...

2008
Luc Florack Evgeniya Balmashnova

Two canonical representations for regularization of unit sphere functions encountered in the context of high angular resolution diffusion imaging (HARDI) are discussed. One of these is based on spherical harmonic decomposition, and its one-parameter extension via Tikhonov regularization. This case is well-established, and is mainly reviewed for the sake of completeness. The second one is new, a...

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