نتایج جستجو برای: and svd

تعداد نتایج: 16827703  

Journal: :The American Mathematical Monthly 2012
Carla D. Martin Mason A. Porter

The singular value decomposition (SVD) is a popular matrix factorization that has been used widely in applications ever since an efficient algorithm for its computation was developed in the 1970s. In recent years, the SVD has become even more prominent due to a surge in applications and increased computational memory and speed. To illustrate the vitality of the SVD in data analysis, we highligh...

Journal: :Stroke 2014
Yoko Okada Katsuhiko Kohara Masayuki Ochi Tokihisa Nagai Yasuharu Tabara Michiya Igase Tetsuro Miki

BACKGROUND AND PURPOSE Arterial stiffness, a risk factor of brain small vessel diseases (SVD), causes hemodynamic changes. Mechanical stresses, circumferential wall tension (WT), and shear stress (SS) may change with arterial stiffness and be related to SVD. We investigated the associations between mechanical stresses and arterial stiffness and SVD. METHODS A total of 1296 subjects without ap...

Journal: :Journal of cerebral blood flow and metabolism : official journal of the International Society of Cerebral Blood Flow and Metabolism 2014
Robert D Stevens Yousef Hannawi Haris Sair

Small vessel disease (SVD) is linked to cognitive impairment and dementia, yet little is known regarding functional activation in patients with SVD. Resting fMRI recordings suggest reduced connectivity in prefrontal, parietal and cingulate nodes and reciprocally increased connectivity in cerebellum, alterations which predicted neuropsychological test performance. Together with diffusion tensor ...

2010
Rebecca A. Charlton Thomas R. Barrick

Background and Purpose—Cerebral small vessel disease (SVD) is the most common cause of vascular dementia. Interest in the use of surrogate markers is increasing. The aims of this study were to determine if brain volume was different between patients with SVD and control subjects, whether it correlated with cognition in SVD, and whether changes in brain volume could be detected during prospectiv...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شیراز - دانشکده علوم 1392

جبر خطّی شاخه ای از ریاضیات است که به بررسی و مطالع? ماتریس ها، بردارها، فضاهای برداری (فضاهای خطّی)، تبدیلات خطی، و دستگاه های معادلات خطی می پردازد. در جبر خطی، الگوریتم svd یک تجزیه از ماتریس حقیقی یا مختلط با کاربردهای فراوان و مفید در پردازش سیگنال و آمار است. الگوریتم svd یک تکنیک برای تجزیه یک ماتریس به ضرب سه فاکتور می باشد. روش ژاکوبی یکی از اولین الگوریتم ها جهت اجرایی کردن svd می باش...

2017
Benjamin Huber Reinhold Schneider

The hierarchical SVD provides a quasi-best low rank approximation of high dimensional data in the hierarchical Tucker framework. Similar to the SVD for matrices, it provides a fundamental but expensive tool for tensor computations. In the present work we examine generalizations of randomized matrix decomposition methods to higher order tensors in the framework of the hierarchical tensors repres...

2013
Lina Zhao Wanbao Hu Lihong Cui

SVD and FFT are both the efficient tools for image analysis and face recognition. In this paper, we first study the role of SVD and FFT in both filed. Then the decomposition information from SVD and FFT are compared. Next, a new viewpoint that the singular value matrix contains the illumination information of the image is proposed and testified by the experiments based on the ORL face database ...

2013
C. Amole G. B. Andresen W. Bertsche A. Capra A. Deller S. Jonsell P. Nolan K. Olchanski S. Stracka E. Sarid D. Seddon T. Tharp

The Silicon Vertex Detector (SVD) is the main diagnostic tool in the ALPHA-experiment. It provides precise spatial and timing information of antiproton (antihydrogen) annihilation events (vertices), and most importantly, the SVD is capable of directly identifying and analysing single annihilation events, thereby forming the basis of ALPHA's analysis. This paper describes the ALPHA SVD and its u...

2016
Yang Jiang Jiejun Wen Yuanlu Wang Yibo Li

In this paper, signal vector based detection (SVD) algorithm for spatial modulation (SM) is modified to achieve a near maximum-likelihood (ML) performance and reduces the complexity compared to ML. First, the proposed low-complexity SVD (LC-SVD) algorithm orders the antenna index list based on the angle between the received vector y and the channel vector j h , and then it estimates symbol by c...

2014
Ahmed F. Mabied Shunsuke Nozawa Manabu Hoshino Ayana Tomita Tokushi Sato Shin-ichi Adachi

Singular value decomposition (SVD) analysis has important applications for time-dependent crystallographic data, extracting significant information. Herein, a successful application of SVD analysis of time-resolved powder diffraction data over the course of an in-situ photodimerization reaction of anthracene derivatives is introduced. SVD revealed significant results in the case of 9-methylanth...

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