نتایج جستجو برای: روش lda

تعداد نتایج: 375270  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان - دانشکده فیزیک 1388

خواص ساختاری، مغناطیسی و الکترونی انبوهه mnse را به دو روش شبه پتانسیل و پتانسیل کامل با استفاده از دو نرم افزار pwscf و wien2k مورد بررسی قرار دادیم. mnse دارای سه فاز ساختاری nacl ، بلندروی و هگزاگونال از نوع nias است. محاسباتمان را در دوحالت فرومغناطیس و پادفرومغناطیس انجام دادیم. مشاهدات تجربی فاز nacl با نظم پادفرومغناطیسی نوعii ؛یعنی nacl(111) را به عنوان فاز پایدار معرفی کرده است در حالی...

2005
Seung-Jean Kim Alessandro Magnani Stephen P. Boyd

Fisher linear discriminant analysis (LDA) can be sensitive to the problem data. Robust Fisher LDA can systematically alleviate the sensitivity problem by explicitly incorporating a model of data uncertainty in a classification problem and optimizing for the worst-case scenario under this model. The main contribution of this paper is show that with general convex uncertainty models on the proble...

2016
Timothy N. Rubin Oluwasanmi Koyejo Michael N. Jones Tal Yarkoni

This paper presents Generalized Correspondence-LDA (GC-LDA), a generalization of the Correspondence-LDA model that allows for variable spatial representations to be associated with topics, and increased flexibility in terms of the strength of the correspondence between data types induced by the model. We present three variants of GC-LDA, each of which associates topics with a different spatial ...

2015
Kibok Lee Junmo Kim

Linear discriminant analysis (LDA) is a popular dimensionality reduction and classification method that simultaneously maximizes between-class scatter and minimizes within-class scatter. In this paper, we verify the equivalence of LDA and least squares (LS) with a set of dependent variable matrices. The equivalence is in the sense that the LDA solution matrix and the LS solution matrix have the...

2005
Hakan Erdoğan

Linear Discriminant Analysis (LDA) followed by a diagonalizing maximum likelihood linear transform (MLLT) applied to spliced static MFCC features yields important performance gains as compared to MFCC+dynamic features in most speech recognition tasks. It is reasonable to regularize LDA transform computation for stability. In this paper, we regularize LDA and heteroschedastic LDA transforms usin...

Journal: :Journal of the American Chemical Society 2006
Kanwal Jit Singh David B Collum

Structural and mechanistic studies of the lithium diisopropylamide (LDA)-mediated anionic Fries rearrangements of aryl carbamates are described. Substituents at the meta position of the arene (H, OMe, F) and the dialkylamino moiety of the carbamate (Me(2)N, Et(2)N, and i-Pr(2)N) markedly influence the relative rates of ortholithiation and subsequent Fries rearrangement. Structural studies using...

2004
Yanwei Pang Lei Zhang Mingjing Li Zhengkai Liu Wei-Ying Ma

In this paper, a novel face recognition method based on Gabor-wavelet and linear discriminant analysis (LDA) is proposed. Given training face images, discriminant vectors are computed using LDA. The function of the discriminant vectors is two-fold. First, discriminant vectors are used as a transform matrix, and LDA features are extracted by projecting original intensity images onto discriminant...

2010
Arturo Flores Marius George Linguraru Kazunori Okada

We propose a novel approach to boosting weighted linear discriminant analysis (LDA) as a weak classifier. Combining Adaboost with LDA allows selecting the most relevant features for classification at each boosting iteration, thus benefiting from feature correlation. The advantages of this approach include the use of a smaller number of weak learners to achieve a low error rate, improved classif...

1997
Vladimir I Anisimov

A generalization of the local density approximation (LDA) method for systems with strong Coulomb correlations is described which gives a correct description of the Mott insulators. The LDA + U method takes into account orbital dependence of the Coulomb and exchange interactions which is absent in the LDA. The scheme can be regarded as a ‘firstprinciples’ method because there are no adjustable p...

2016
Dongxu Zhang Tianyi Luo Dong Wang

Latent Dirichlet Allocation (LDA) is a three-level hierarchical Bayesian model for topic inference. In spite of its great success, inferring the latent topic distribution with LDA is time-consuming. Motivated by the transfer learning approach proposed by Hinton et al. (2015), we present a novel method that uses LDA to supervise the training of a deep neural network (DNN), so that the DNN can ap...

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