Results 11 to 20 of about 910,963 (262)
Single-Frame Attitude Determination Methods for Nanosatellites
Metrology and Measurement Systems, 2017 Single-frame methods of determining the attitude of a nanosatellite are compared in this study. The methods selected for comparison are: Single Value Decomposition (SVD), q method, Quaternion ESTimator (QUEST), Fast Optimal Attitude Matrix (FOAM) − all ...
Guler Demet Cilden +2 more
doaj +1 more source
Sensors, 2017 High-accuracy railway track surveying is essential for railway construction and maintenance. The traditional approaches based on total station equipment are not efficient enough since high precision surveying frequently needs static measurements.
Qingan Jiang +3 more
doaj +1 more source
Large Covariance Estimation by Thresholding Principal Orthogonal Complements [PDF]
, 2013 This paper deals with the estimation of a high-dimensional covariance with a conditional sparsity structure and fast-diverging eigenvalues. By assuming sparse error covariance matrix in an approximate factor model, we allow for the presence of some cross-
Fan, Jianqing +2 more
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Performance of internal Covariance Estimators for Cosmic Shear Correlation Functions [PDF]
, 2015 Data re-sampling methods such as the delete-one jackknife are a common tool for estimating the covariance of large scale structure probes. In this paper we investigate the concepts of internal covariance estimation in the context of cosmic shear two ...
Eifler, T. F. +3 more
core +2 more sources
Optimal Estimation and Rank Detection for Sparse Spiked Covariance Matrices [PDF]
, 2015 This paper considers sparse spiked covariance matrix models in the high-dimensional setting and studies the minimax estimation of the covariance matrix and the principal subspace as well as the minimax rank detection.
Cai, Tony, Ma, Zongming, Wu, Yihong
core +3 more sources
Covariates in linkage analysis [PDF]
Genetic Epidemiology, 1999 AbstractWe apply a novel technique to detect significant covariates in linkage analysis using a logistic regression approach. An overall test of linkage is first performed to determine whether there is significant perturbation from the expected 50% sharing under the hypothesis of no linkage; if the overall test is significant, the importance of the ...
J P, Rice +6 more
openaire +2 more sources
Frontiers in Aging Neuroscience, 2019 There is an increasing interest in identifying non-invasive biomarkers of disease severity and prognosis in idiopathic Parkinson’s disease (PD). Dopamine-transporter SPECT (DAT-SPECT), diffusion tensor imaging (DTI), and structural magnetic resonance ...
Sara Lorio +11 more
doaj +1 more source
Efficient Methods of Utilizing Multi-SBAS Corrections in Multi-GNSS Positioning
Sensors, 2020 Various combining methods have been proposed to utilize multi-satellite-based augmentation system (SBAS) correction to provide accurate position in the global navigation satellite system (GNSS) receiver.
Kwi Woo Park +2 more
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BCCT: A GUI Toolkit for Brain Structural Covariance Connectivity Analysis on MATLAB
Frontiers in Human Neuroscience, 2021 Brain structural covariance network (SCN) can delineate the brain synchronized alterations in a long-range time period. It has been used in the research of cognition or neuropsychiatric disorders.
Qiang Xu +18 more
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A cautionary note on robust covariance plug-in methods [PDF]
, 2014 Many multivariate statistical methods rely heavily on the sample covariance matrix. It is well known though that the sample covariance matrix is highly non-robust.
Nordhausen, Klaus, Tyler, David E.
core +1 more source