Results 61 to 70 of about 115,750 (273)

Interpretable Topic Extraction and Word Embedding Learning Using Non-Negative Tensor DEDICOM

Machine Learning and Knowledge Extraction, 2021
Unsupervised topic extraction is a vital step in automatically extracting concise contentual information from large text corpora. Existing topic extraction methods lack the capability of linking relations between these topics which would further help ...
Lars Hillebrand, David Biesner, Christian Bauckhage, Rafet Sifa   +3 more
doaj   +1 more source

Butterfly Factorization

, 2015
The paper introduces the butterfly factorization as a data-sparse approximation for the matrices that satisfy a complementary low-rank property. The factorization can be constructed efficiently if either fast algorithms for applying the matrix and its ...
Ho, Kenneth, Li, Yingzhou, Martin, Eileen, Yang, Haizhao, Ying, Lexing   +4 more
core   +1 more source

Angular factorization of matrices

Journal of Mathematical Analysis and Applications, 1982
AbstractLet Q denote a selfadjoint matrix (or operator of finite rank). The factorization of I + Q into the form I + Q = (I − W) D(I − W∗) is considered. The well-known case where W is constrained to be lower triangular while D is diagonal is extended to quadrangular and other generalized-canonical forms.
Porter, William A, DeSantis, Romano M
openaire   +1 more source

An upstream open reading frame regulates expression of the mitochondrial protein Slm35 and mitophagy flux

FEBS Letters, EarlyView.
This study reveals how the mitochondrial protein Slm35 is regulated in Saccharomyces cerevisiae. The authors identify stress‐responsive DNA elements and two upstream open reading frames (uORFs) in the 5′ untranslated region of SLM35. One uORF restricts translation, and its mutation increases Slm35 protein levels and mitophagy.
Hernán Romo‐Casanueva, Ariann E. Mendoza‐Martínez, P. Abril Medina‐Flores, Carlos Campero‐Basaldua, Alexander DeLuna, Soledad Funes   +5 more
wiley   +1 more source

spam: A Sparse Matrix R Package with Emphasis on MCMC Methods for Gaussian Markov Random Fields

Journal of Statistical Software, 2010
spam is an R package for sparse matrix algebra with emphasis on a Cholesky factorization of sparse positive definite matrices. The implemantation of spam is based on the competing philosophical maxims to be competitively fast compared to existing tools ...
Reinhard Furrer, Stephan R. Sain
doaj  

Cell wall target fragment discovery using a low‐cost, minimal fragment library

FEBS Letters, EarlyView.
LoCoFrag100 is a fragment library made up of 100 different compounds. Similarity between the fragments is minimized and 10 different fragments are mixed into a single cocktail, which is soaked to protein crystals. These crystals are analysed by X‐ray crystallography, revealing the binding modes of the bound fragment ligands.
Kaizhou Yan, Mathew Stanley, Olawale Raimi, Andrew T. Ferenbach, Helge C Dorfmueller, Daan M. F. van Aalten   +5 more
wiley   +1 more source

Eigenphase preserving two-channel SUSY transformations

, 2010
We propose a new kind of supersymmetric (SUSY) transformation in the case of the two-channel scattering problem with equal thresholds, for partial waves of the same parity.
Ablowitz M A, Andrey M Pupasov, Baye D, Boris F Samsonov, Cannata F, Chadan K, Daniel Baye, Erdélyi A, Gelfand I M, Gelfand I M, Jean-Marc Sparenberg, Kohlhoff H, Levitan B M, Marchenko V A, Newton R G, Novikov S P, Pupasov A M, Pupasov A M, Samsonov B F, Samsonov B F, Samsonov B F, Sparenberg J-M, Sukumar C V, Taylor J R   +23 more
core   +1 more source

Nilpotent factorization of matrices [PDF]

Linear and Multilinear Algebra, 1992
We show that, with the exception of 2 × 2 nonzero nilpotent matrices, every singular square matrix over an arbitrary field is a product of two nilpotent matrices.
openaire   +1 more source

Structural biology of ferritin nanocages

FEBS Letters, EarlyView.
Ferritin is a conserved iron‐storage protein that sequesters iron as a ferric mineral core within a nanocage, protecting cells from oxidative damage and maintaining iron homeostasis. This review discusses ferritin biology, structure, and function, and highlights recent cryo‐EM studies revealing mechanisms of ferritinophagy, cellular iron uptake, and ...
Eloise Mastrangelo, Flavio Di Pisa
wiley   +1 more source

Characterizing Variability of Modular Brain Connectivity with Constrained Principal Component Analysis. [PDF]

PLoS ONE, 2016
Characterizing the variability of resting-state functional brain connectivity across subjects and/or over time has recently attracted much attention.
Jun-Ichiro Hirayama, Aapo Hyvärinen, Vesa Kiviniemi, Motoaki Kawanabe, Okito Yamashita   +4 more
doaj   +1 more source