keyword
MENU ▼
Read by QxMD icon Read
search

Mahalanobis

keyword
https://www.readbyqxmd.com/read/29045063/evaluating-manufacturing-process-profile-comparability-with-multivariate-equivalence-testing-case-study-of-cell-culture-small-scale-model-transfer
#1
Yang Cao, Daniel Obeng, Guodong Hui, Luting Xue, Yukun Ren, Xianjie Yu, Fei Wang, Chad Atwell
This paper studies the Generalized Mahalanobis Distance (GMD) approach proposed by Hoffelder(1) which measures the dissimilarity of two multivariate Gaussian distributions with arbitrary covariance matrices and unequal sample sizes. This investigation demonstrated that, with appropriate adjustment, the GMD approach can achieve the targeted nominal Type I error and provide sufficient power for testing equivalence between two profile populations. The adjusted GMD approach was applied to examine the equivalence of harvest profiles between a 12L small scale model and 2000L manufacturing scale in a transfer study performed at Sanofi Speciality Care Framingham Biologics...
October 16, 2017: Biotechnology Progress
https://www.readbyqxmd.com/read/29035333/water-quality-sensing-and-spatio-temporal-monitoring-structure-with-autocorrelation-kernel-methods
#2
Iván P Vizcaíno, Enrique V Carrera, Sergio Muñoz-Romero, Luis H Cumbal, José Luis Rojo-Álvarez
Pollution on water resources is usually analyzed with monitoring campaigns, which consist of programmed sampling, measurement, and recording of the most representative water quality parameters. These campaign measurements yields a non-uniform spatio-temporal sampled data structure to characterize complex dynamics phenomena. In this work, we propose an enhanced statistical interpolation method to provide water quality managers with statistically interpolated representations of spatial-temporal dynamics. Specifically, our proposal makes efficient use of the a priori available information of the quality parameter measurements through Support Vector Regression (SVR) based on Mercer's kernels...
October 16, 2017: Sensors
https://www.readbyqxmd.com/read/29034407/novel-mahalanobis-based-feature-selection-improves-one-class-classification-of-early-hepatocellular-carcinoma
#3
Ricardo de Lima Thomaz, Pedro Cunha Carneiro, João Eliton Bonin, Túlio Augusto Alves Macedo, Ana Claudia Patrocinio, Alcimar Barbosa Soares
Detection of early hepatocellular carcinoma (HCC) is responsible for increasing survival rates in up to 40%. One-class classifiers can be used for modeling early HCC in multidetector computed tomography (MDCT), but demand the specific knowledge pertaining to the set of features that best describes the target class. Although the literature outlines several features for characterizing liver lesions, it is unclear which is most relevant for describing early HCC. In this paper, we introduce an unconstrained GA feature selection algorithm based on a multi-objective Mahalanobis fitness function to improve the classification performance for early HCC...
October 16, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29023058/morphometric-characteristics-of-asian-catfish-hemibagrus-wyckii-bleeker-1858-bagridae-from-the-riau-province-of-indonesia
#4
Netti Aryani, Saberina Hasibuan, Ainul Mardiah, Hafrijal Syandri
BACKGROUND AND OBJECTIVE: Asian Catfish (Hemibagrus wyckii) is an important fish having both food and a high price in the market. These species are categorized as a carnivorous freshwater finfish native in Indonesia and is vulnerable to endangered status. This study was carried out to identify the morphometric characteristics of Hemibagrus wyckii (H. wyckii) from the Koto Panjang Reservoir, Kampar Kanan and Kampar Kiri rivers. MATERIALS AND METHODS: Twenty-five fish were collected from each sampling site...
2017: Pakistan Journal of Biological Sciences: PJBS
https://www.readbyqxmd.com/read/28981671/climate-shapes-the-geographic-distribution-of-the-blowfly-sarconesia-chlorogaster-diptera-calliphoridae-an-environmental-niche-modeling-approach
#5
Melise Cristine Lecheta, Rodrigo César Corrêa, Mauricio Osvaldo Moura
For all species, abiotic factors directly affect performance, survival and reproduction, and consequently, their geographic distribution. Species distribution models (SDMs) are important tools to predict the influence of abiotic factors in species distributions and has been more applied over the years. However, these models can be built under different algorithms and using different methods to select environmental predictors, which can lead to different results. Five different algorithms and two sets of environmental predictors were compared to predict the geographic distribution of the blowfly Sarconesia chlorogaster (Wiedemann) (Diptera: Calliphoridae)...
July 12, 2017: Environmental Entomology
https://www.readbyqxmd.com/read/28981453/detecting-steps-walking-at-very-low-speeds-combining-outlier-detection-transition-matrices-and-autoencoders-from-acceleration-patterns
#6
Mario Muñoz-Organero, Ramona Ruiz-Blázquez
In this paper, we develop and validate a new algorithm to detect steps while walking at speeds between 30 and 40 steps per minute based on the data sensed from a single tri-axial accelerometer. The algorithm concatenates three consecutive phases. First, an outlier detection is performed on the sensed data based on the Mahalanobis distance to pre-detect candidate points in the acceleration time series that may contain a ground contact segment of data while walking. Second, the acceleration segment around the pre-detected point is used to calculate the transition matrix in order to capture the time dependencies...
October 5, 2017: Sensors
https://www.readbyqxmd.com/read/28973780/diversity-among-elephant-grass-genotypes-using-bayesian-multi-trait-model
#7
D A Rossi, R F Daher, T C Barbé, R S N Lima, A F Costa, L P Ribeiro, P E Teodoro, L L Bhering
Elephant grass is a perennial tropical grass with great potential for energy generation from biomass. The objective of this study was to estimate the genetic diversity among elephant grass accessions based on morpho-agronomic and biomass quality traits and to identify promising genotypes for obtaining hybrids with high energetic biomass production capacity. The experiment was installed at experimental area of the State Agricultural College Antônio Sarlo, in Campos dos Goytacazes. Fifty-two elephant grass genotypes were evaluated in a randomized block design with two replicates...
September 27, 2017: Genetics and Molecular Research: GMR
https://www.readbyqxmd.com/read/28973743/intraspecific-variability-of-popcorn-s7-lines-for-phosphorus-efficiency-in-the-soil
#8
I F S Gerhardt, A T Amaral Júnior, L J M Guimarães, I A Schwantes, A Santos, S H Kamphorst, V J Lima, F M Poblete, G O Myers
The expansion of agriculture, coupled with the need for sustainable cropping, is one of the greatest challenges of the scientific community working on the generation of new cultivars adapted to abiotic stress conditions. The aim of this study was to evaluate the variability of popcorn lines as to responsiveness and efficiency in phosphorus use, as a first step towards the implementation of a breeding program interested in the practice of sustainable agriculture. Twenty-five popcorn lines were evaluated in two locations with different phosphorus levels in the soil, using a randomized block design...
September 27, 2017: Genetics and Molecular Research: GMR
https://www.readbyqxmd.com/read/28923116/wing-variation-in-culex-nigripalpus-diptera-culicidae-in-urban-parks
#9
Gabriela Cristina de Carvalho, Daniel Pagotto Vendrami, Mauro Toledo Marrelli, André Barretto Bruno Wilke
BACKGROUND: Culex nigripalpus has a wide geographical distribution and is found in North and South America. Females are considered primary vectors for several arboviruses, including Saint Louis encephalitis virus, Venezuelan equine encephalitis virus and Eastern equine encephalitis virus, as well as a potential vector of West Nile virus. In view of the epidemiological importance of this mosquito and its high abundance, this study sought to investigate wing variation in Cx. nigripalpus populations from urban parks in the city of São Paulo, Brazil...
September 18, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28910329/classification-and-conservation-priority-of-five-deccani-sheep-ecotypes-of-maharashtra-india
#10
Dinesh Kumar Yadav, Reena Arora, Anand Jain
Characterization of Indian livestock breeds has mostly been limited to single breed/population focused on either physical description of traditionally recognized breeds/populations or to their genetic description. Usually, morphological and genetic characterization has taken place in isolation. A parallel morphological characterization of genetically identified breeds or genetic characterization of morphologically described breeds is mostly missing, and their conservation priorities have largely been based on solely considering degree of endangerment...
2017: PloS One
https://www.readbyqxmd.com/read/28892170/application-of-visible-near-infrared-spectroscopy-in-the-prediction-of-azodicarbonamide-in-wheat-flour
#11
Wenkai Che, Laijun Sun, Qian Zhang, Dan Zhang, Dandan Ye, Wenyi Tan, Lekai Wang, Changjun Dai
Azodicarbonamide is wildly used in flour industry as a flour gluten fortifier in many countries, but it was proved by some researches to be dangerous or unhealthy for people and not suitable to be added in flour. Applying a rapid, convenient, and noninvasive technique in food analytical procedure for the safety inspection has become an urgent need. This paper used Vis/NIR reflectance spectroscopy analysis technology, which is based on the physical property analysis to predict the concentration of azodicarbonamide in flour...
October 2017: Journal of Food Science
https://www.readbyqxmd.com/read/28877741/morphometric-variability-among-the-species-of-the-sordida-subcomplex-hemiptera-reduviidae-triatominae-evidence-for-differentiation-across-the-distribution-range-of-triatoma-sordida
#12
Julieta Nattero, Romina Valeria Piccinali, Catarina Macedo Lopes, María Laura Hernández, Luciana Abrahan, Patricia Alejandra Lobbia, Claudia Susana Rodríguez, Ana Laura Carbajal de la Fuente
BACKGROUND: The Sordida subcomplex (Triatominae) comprises four species, Triatoma garciabesi, T. guasayana, T. patagonica and T. sordida, which differ in epidemiological importance and adaptations to human environments. Some morphological similarities among species make taxonomic identification, population differentiation and species delimitation controversial. Triatoma garciabesi and T. sordida are the most similar species, having been considered alternatively two and a single species until T...
September 6, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28873878/assessing-gait-impairments-based-on-auto-encoded-patterns-of-mahalanobis-distances-from-consecutive-steps
#13
Mario Muñoz-Organero, Richard Davies, Sue Mawson
Insole pressure sensors capture the force distribution patterns during the stance phase while walking. By comparing patterns obtained from healthy individuals to patients suffering different medical conditions based on a given similarity measure, automatic impairment indexes can be computed in order to help in applications such as rehabilitation. This paper uses the data sensed from insole pressure sensors for a group of healthy controls to train an auto-encoder using patterns of stochastic distances in series of consecutive steps while walking at normal speeds...
2017: Studies in Health Technology and Informatics
https://www.readbyqxmd.com/read/28867223/protein-protein-interaction-site-predictions-with-minimum-covariance-determinant-and-mahalanobis-distance
#14
Zhijun Qiu, Bo Zhou, Jiangfeng Yuan
Protein-protein interaction site (PPIS) prediction must deal with the diversity of interaction sites that limits their prediction accuracy. Use of proteins with unknown or unidentified interactions can also lead to missing interfaces. Such data errors are often brought into the training dataset. In response to these two problems, we used the minimum covariance determinant (MCD) method to refine the training data to build a predictor with better performance, utilizing its ability of removing outliers. In order to predict test data in practice, a method based on Mahalanobis distance was devised to select proper test data as input for the predictor...
September 1, 2017: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/28844081/comparison-of-global-metabolite-extraction-strategies-for-soybeans-using-uhplc-hrms
#15
Iqbal Mahmud, Sandi Sternberg, Michael Williams, Timothy J Garrett
Metabolism, downstream effectors of genomics, transcriptomics, and proteomics, can determine the potential of phenotype of an organism including plants. Profiling the global scenario of metabolism requires optimization of different solvent extraction methods. Here, we report an approach comparing three different metabolite extraction strategies, including ammonium acetate/methanol (AAM), water/methanol (WM), and sodium phosphate/methanol (PM) in soybean plant using ultra-high-performance liquid chromatography coupled with high-resolution mass spectrometry (UHPLC-HRMS)...
August 26, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28811820/modified-mahalanobis-taguchi-system-for-imbalance-data-classification
#16
Mahmoud El-Banna
The Mahalanobis Taguchi System (MTS) is considered one of the most promising binary classification algorithms to handle imbalance data. Unfortunately, MTS lacks a method for determining an efficient threshold for the binary classification. In this paper, a nonlinear optimization model is formulated based on minimizing the distance between MTS Receiver Operating Characteristics (ROC) curve and the theoretical optimal point named Modified Mahalanobis Taguchi System (MMTS). To validate the MMTS classification efficacy, it has been benchmarked with Support Vector Machines (SVMs), Naive Bayes (NB), Probabilistic Mahalanobis Taguchi Systems (PTM), Synthetic Minority Oversampling Technique (SMOTE), Adaptive Conformal Transformation (ACT), Kernel Boundary Alignment (KBA), Hidden Naive Bayes (HNB), and other improved Naive Bayes algorithms...
2017: Computational Intelligence and Neuroscience
https://www.readbyqxmd.com/read/28772182/evaluation-of-an-electronic-nose-for-odorant-and-process-monitoring-of-alkaline-stabilized-biosolids-production
#17
Adrian Romero-Flores, Laura L McConnell, Cathleen J Hapeman, Mark Ramirez, Alba Torrents
Electronic noses have been widely used in the food industry to monitor process performance and quality control, but use in wastewater and biosolids treatment has not been fully explored. Therefore, we examined the feasibility of an electronic nose to discriminate between treatment conditions of alkaline stabilized biosolids and compared its performance with quantitative analysis of key odorants. Seven lime treatments (0-30% w/w) were prepared and the resultant off-gas was monitored by GC-MS and by an electronic nose equipped with ten metal oxide sensors...
November 2017: Chemosphere
https://www.readbyqxmd.com/read/28766174/discriminant-analysis-of-intracranial-volumetric-variables-in-patients-with-normal-pressure-hydrocephalus-and-brain-atrophy
#18
Leszek Czerwosz, Ewa Szczepek, Krzysztof Nowiński, Beata Sokołowska, Jerzy Jurkiewicz, Zbigniew Czernicki, Waldemar Koszewski
A method was developed for the computerized volumetric assessment of the intracranial cerebrospinal fluid (CSF) distribution. The study involved 62 patients differentiated into two groups: with CSF resorption disorders (normal pressure hydrocephalus - 30 patients) and without CSF resorption disorders (various types of brain atrophy - 32 patients). The goal of the study was to ascertain whether the assessment, depending on the linear discriminant analysis of volumetric brain features, could be an effective tool differentiating the two groups...
August 2, 2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28755945/standardization-of-milk-mid-infrared-spectrometers-for-the-transfer-and-use-of-multiple-models
#19
C Grelet, J A Fernández Pierna, P Dardenne, H Soyeurt, A Vanlierde, F Colinet, C Bastin, N Gengler, V Baeten, F Dehareng
An increasing number of models are being developed to provide information from milk Fourier transform mid-infrared (FT-MIR) spectra on fine milk composition, technological properties of milk, or even cows' physiological status. In this context, and to take advantage of these existing models, the purpose of this work was to evaluate whether a spectral standardization method can enable the use of multiple equations within a network of different FT-MIR spectrometers. The piecewise direct standardization method was used, matching "slave" instruments to a common reference, the "master...
July 26, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28752262/discrimination-model-applied-to-urinalysis-of-patients-with-diabetes-and-hypertension-aiming-at-diagnosis-of-chronic-kidney-disease-by-raman-spectroscopy
#20
Elzo Everton de Souza Vieira, Jeyse Aliana Martins Bispo, Landulfo Silveira, Adriana Barrinha Fernandes
Higher blood pressure level and poor glycemic control in diabetic patients are considered progression factors that cause faster decline in kidney functions leading to kidney damage. The present study aimed to develop a quantification model of biomarkers creatinine, urea, and glucose by means of selected peaks of these compounds, measured by Raman spectroscopy, and to estimate the concentration of these analytes in the urine of normal subjects (G_N), diabetic patients with hypertension (G_WOL) patients with chronic renal failure doing dialysis (G_D)...
July 27, 2017: Lasers in Medical Science
keyword
keyword
27256
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"