keyword
MENU ▼
Read by QxMD icon Read
search

linear model

keyword
https://www.readbyqxmd.com/read/28092768/mercury-levels-in-herring-gulls-and-fish-42-years-of-spatio-temporal-trends-in-the-great-lakes
#1
E Agnes Blukacz-Richards, Ariola Visha, Matthew L Graham, Daryl L McGoldrick, Shane R de Solla, David J Moore, George B Arhonditsis
Total mercury levels in aquatic birds and fish communities have been monitored across the Canadian Great Lakes by Environment and Climate Change Canada (ECCC) for the past 42 years (1974-2015). These data (22 sites) were used to examine spatio-temporal variability of mercury levels in herring gull (Larus argentatus) eggs, lake trout (Salvelinus namaycush), walleye (Sander vitreus), and rainbow smelt (Osmerus mordax). Trends were quantified with dynamic linear models, which provided time-variant rates of change of mercury concentrations...
December 30, 2016: Chemosphere
https://www.readbyqxmd.com/read/28092762/a-novel-approach-for-exposure-assessment-in-air-pollution-epidemiological-studies-using-neuro-fuzzy-inference-systems-comparison-of-exposure-estimates-and-exposure-health-associations
#2
Victoria Blanes-Vidal, Manuella Lech Cantuaria, Esmaeil S Nadimi
Many epidemiological studies have used proximity to sources as air pollution exposure assessment method. However, proximity measures are not generally good surrogates because of their complex non-linear relationship with exposures. Neuro-fuzzy inference systems (NFIS) can be used to map complex non-linear systems, but its usefulness in exposure assessment has not been extensively explored. We present a novel approach for exposure assessment using NFIS, where the inputs of the model were easily-obtainable proximity measures, and the output was residential exposure to an air pollutant...
January 13, 2017: Environmental Research
https://www.readbyqxmd.com/read/28092643/physical-activity-and-sedentary-time-among-children-with-disabilities-at-school
#3
Cindy H P Sit, Thomas L McKenzie, Ester Cerin, Bik C Chow, Wendy Y Huang, Jie Yu
PURPOSES: Physical activity (PA) is important for the development of children with disabilities, but rarely does this population meet the recommended standards. Schools are salient locations for PA, but little is known about how specific school settings affect the PA of children with diverse disabilities. We assessed PA and sedentary time (ST) of children with disabilities in three school settings (physical education, recess, lunchtime). METHODS: Participants included 259 children from 13 Hong Kong special schools for five primary disabilities: visual impairments, hearing impairments, physical disabilities, intellectual disabilities, and social development problems...
February 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28092555/progressive-shape-distribution-encoder-for-3d-shape-retrieval
#4
Jin Xie, Fan Zhu, Guoxian Dai, Ling Shao, Yi Fang
Since there are complex geometric variations with 3D shapes, extracting efficient 3D shape features is one of the most challenging tasks in shape matching and retrieval. In this paper, we propose a deep shape descriptor by learning shape distributions at different diffusion time via a progressive shape-distribution-encoder (PSDE). First, we develop a shape distribution representation with the kernel density estimator to characterize the intrinsic geometry structures of 3D shapes. Then, we propose to learn a deep shape feature through an unsupervised PSDE...
January 10, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28092552/discriminative-elastic-net-regularized-linear-regression
#5
Zheng Zhang, Zhihui Lai, Yong Xu, Ling Shao, Jian Wu, Guo-Sen Xie
In this paper, we aim at learning compact and discriminative linear regression models. Linear regression has been widely used in different problems. However, most of the existing linear regression methods exploit the conventional zeroone matrix as the regression targets, which greatly narrows the flexibility of the regression model. Another major limitation of theses methods is that the learned projection matrix fails to precisely project the image features to the target space due to their weak discriminative capability...
January 11, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28092533/linear-system-models-for-ultrasonic-imaging-intensity-signal-statistics
#6
Craig Abbey, Yang Zhu, Sara Bahramian, Michael Insana
Despite a great deal of work characterizing the statistical properties of radio-frequency backscattered ultrasound signals, less is known about the statistical properties of demodulated intensity signals. Analysis of intensity is made more difficult by a strong nonlinearity that arises in the process of demodulation. This limits our ability to characterize the spatial resolution and noise properties of B-mode ultrasound images. In this work, we generalize earlier results on two-point intensity covariance using a multivariate systems approach...
January 16, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28092526/estimation-of-basis-line-integrals-in-a-spectral-distortion-modeled-photon-counting-detector-using-low-order-polynomial-approximation-of-x-ray-transmittance
#7
Okkyun Lee, Steffen Kappler, Christoph Polster, Katsuyuki Taguchi
Photon counting detector (PCD)-based computed tomography exploits spectral information from a transmitted x-ray spectrum to estimate basis line-integrals. The recorded spectrum, however, is distorted and deviates from the transmitted spectrum due to spectral response effect (SRE). Therefore, the SRE needs to be compensated for when estimating basis lineintegrals. One approach is to incorporate the SRE model with an incident spectrum into the PCD measurement model and the other approach is to perform a calibration process that inherently includes both the SRE and the incident spectrum...
October 26, 2016: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28092524/code-coherence-based-decision-boundaries-for-feature-correspondence
#8
Wen-Yan Lin, Fan Wang, Ming-Ming Cheng, Sai-Kit Yeung, Philip H S Torr, Minh N Do, Jiangbo Lu
A key challenge in feature correspondence is the difficulty in differentiating true and false matches at a local descriptor level. This forces adoption of strict similarity thresholds that discard many true matches. However, if analyzed at a global level, false matches are usually randomly scattered while true matches tend to be coherent (clustered around a few dominant motions), thus creating a coherence based separability constraint. This paper proposes a non-linear regression technique that can discover such a coherence based separability constraint from highly noisy matches and embed it into a correspondence likelihood model...
January 16, 2017: IEEE Transactions on Pattern Analysis and Machine Intelligence
https://www.readbyqxmd.com/read/28092518/compositional-model-based-fisher-vector-coding-for-image-classi%C3%AF-cation
#9
Lingqiao Liu, Peng Wang, Chunhua Shen, Lei Wang, Anton van den Hengel, Chao Wang, Heng Tao Shen
Deriving from the gradient vector of a generative model of local features, Fisher vector coding (FVC) has been identified as an effective coding method for image classification. Most, if not all, FVC implementations employ the Gaussian mixture model (GMM) as the generative model for local features. However, the representative power of a GMM can be limited because it essentially assumes that local features can be characterized by a fixed number of feature prototypes, and the number of prototypes is usually small in FVC...
January 10, 2017: IEEE Transactions on Pattern Analysis and Machine Intelligence
https://www.readbyqxmd.com/read/28092462/adolescent-cardiovascular-functional-and-structural-outcomes-of-growth-trajectories-from-infancy-prospective-community-based-study
#10
Alanna N Hanvey, Fiona K Mensah, Susan A Clifford, Melissa Wake
BACKGROUND: Adult BMI trajectories outperform single BMI measurements as predictors of cardiovascular mortality; however, it is unknown whether this also holds in childhood. We aimed to identify BMI trajectory categories from birth to adolescence, and examine their associations with adolescent cardiovascular function and structure. METHODS: Adolescents from a community-based prospective birth cohort completed 11-16 BMI measurements between birth and adolescence...
January 16, 2017: Childhood Obesity
https://www.readbyqxmd.com/read/28092410/big-five-personality-characteristics-are-associated-with-depression-subtypes-and-symptom-dimensions-of-depression-in-older-adults
#11
A M L Koorevaar, J M Hegeman, F Lamers, A D F Dhondt, R C van der Mast, M L Stek, H C Comijs
OBJECTIVE: This study examined the associations of personality characteristics with both subtypes and symptom dimensions of depression in older adults. METHODS: Three hundred and seventy-eight depressed older adults participated in the Netherlands Study of Depression in Older Persons. Personality characteristics were assessed by the NEO-Five Factor Inventory. Subtypes and symptom dimensions of depression were determined using the Composite International Diagnostic Interview and the Inventory of Depressive Symptomatology (IDS)...
January 16, 2017: International Journal of Geriatric Psychiatry
https://www.readbyqxmd.com/read/28092399/association-of-dietary-patterns-with-global-and-domain-specific-cognitive-decline-in-chinese-elderly
#12
Yen-Ching Chen, Chien-Cheng Jung, Jen-Hau Chen, Jeng-Min Chiou, Ta-Fu Chen, Ya-Fang Chen, Sung-Chun Tang, Shin-Joe Yeh, Meei-Shyuan Lee
BACKGROUND: Significant differences exist between eastern and western diets, and the way in which Chinese dietary intake relates to specific cognitive domains remains unclear. We aimed to assess the association between dietary patterns (DPs) and cognitive decline in Chinese elderly. SETTING: Participants were recruited from the elderly health checkup program of a teaching hospital in Taipei, Taiwan. PARTICIPANTS: A total of 475 elders (age ≥65) were included in this prospective cohort study...
January 16, 2017: Journal of the American Geriatrics Society
https://www.readbyqxmd.com/read/28092386/closer-insight-into-the-structure-of-moderate-to-densely-branched-comb-polymers-by-combining-modelling-and-linear-rheological-measurements
#13
Mostafa Ahmadi, Sandie Pioge, Charles-Andre Fustin, Jean-Francois Gohy, Evelyne van Ruymbeke
Synthesis of combs with well-entangled backbones and long branches with high densities has always been a challenge. Steric hindrance frequently leads to coupling of chains and structural imperfections that cannot be easily distinguished by traditional characterization methods. Research studies have therefore tried to use a combination of different methods to obtain more information on the actual microstructures. In this work, a grafting-from approach is used to synthesize poly(n-butyl acrylate) combs using atom transfer radical polymerization (ATRP) in three steps including the synthesis of a backbone, cleavage of protecting groups and growth of side branches...
January 16, 2017: Soft Matter
https://www.readbyqxmd.com/read/28092279/association-between-long-term-blood-pressure-control-and-ten-year-progression-in-carotid-arterial-stiffness-among-hypertensive-individuals-the-multiethnic-study-of-atherosclerosis
#14
Yacob G Tedla, Adam D Gepner, Dhananjay Vaidya, Laura Colangelo, James H Stein, Kiang Liu, Philip Greenland
BACKGROUND: Arterial stiffness was shown to be higher among hypertensive patients with diabetes than those without diabetes and among older than younger hypertensive patients. We examined whether the association between long-term blood pressure (BP) control and 10-year progression in carotid arterial stiffness varies by diabetes status and age. METHODS: Participants were 906 individuals with hypertension at baseline and three follow-up visits in the Multi-Ethnic Study of Atherosclerosis (mean age 63...
January 13, 2017: Journal of Hypertension
https://www.readbyqxmd.com/read/28092277/hierarchical-linear-modeling-for-analysis-of-ecological-momentary-assessment-data-in-physical-medicine-and-rehabilitation-research
#15
Lauren Terhorst, Kelly Battle Beck, Ashlee B McKeon, Kristin M Graham, Feifei Ye, Saul Shiffman
Ecological momentary assessment (EMA) methods collect real-time data in real-world environments, which allow physical medicine and rehabilitation researchers to examine objective outcome data and reduces bias from retrospective recall. The statistical analysis of EMA data is directly related to the research question and the temporal design of the study. Hierarchical linear modeling, which accounts for multiple observations from the same participant, is a particularly useful approach to analyzing EMA data. The objective of this paper was to introduce the process of conducting hierarchical linear modeling analyses with EMA data...
January 13, 2017: American Journal of Physical Medicine & Rehabilitation
https://www.readbyqxmd.com/read/28092235/hospital-cost-and-length-of-stay-in-idiopathic-pulmonary-fibrosis
#16
Joshua J Mooney, Karina Raimundo, Eunice Chang, Michael S Broder
OBJECTIVE: To provide a detailed picture of the economic impact of hospitalization in idiopathic pulmonary fibrosis (IPF) and to identify factors associated with cost and length of stay (LOS). METHODS: In this retrospective cross-sectional study using the Nationwide Inpatient Sample (NIS), we included hospitalizations for IPF (ICD-9-CM 516.3) with a principal diagnosis of respiratory disease (ICD-9-CM 460-519) from 2009-2011; lung transplant admissions were excluded...
January 16, 2017: Journal of Medical Economics
https://www.readbyqxmd.com/read/28092065/impact-of-celecoxib-on-inflammation-during-cancer-surgery-a-randomized-clinical-trial
#17
Jonathan G Hiller, Shienny Sampurno, Rosemary Millen, Niketh Kuruvilla, Kwok M Ho, Rob Ramsay, Bernhard Riedel
PURPOSE: During cancer surgery, prostaglandin-mediated inflammation may promote and activate micrometastatic disease with a consequent increase in long-term cancer recurrence. Cyclooxygenase-2 inhibitors, known to have anti-proliferative properties, may offset such perioperative perturbation. We investigated the effectiveness of these agents to minimize inflammatory changes during cancer surgery. METHODS: Following ethics approval, 32 patients who were to undergo major intracavity cancer surgery were enrolled in this prospective, randomized, clinical trial...
January 13, 2017: Canadian Journal of Anaesthesia, Journal Canadien D'anesthésie
https://www.readbyqxmd.com/read/28092060/parenting-self-efficacy-parent-depression-and-healthy-childhood-behaviors-in-a-low-income-minority-population-a-cross-sectional-analysis
#18
William J Heerman, Julie Lounds Taylor, Kenneth A Wallston, Shari L Barkin
Objectives Childhood obesity prevention and treatment depends, in part, on parents acting as agents of change for their children. Our objective was to measure the associations between parenting self-efficacy, parent depressive symptoms, and preschool child behaviors that support healthy growth. Methods We performed a cross-sectional analysis of baseline data from a randomized controlled trial. Parenting self-efficacy was measured using a 5-item version of the Parenting Sense of Competence (PSOC-5) scale (α= 0...
January 13, 2017: Maternal and Child Health Journal
https://www.readbyqxmd.com/read/28091636/assessing-the-electrochemical-properties-of-polypyridine-and-polythiophene-for-prospective-applications-in-sustainable-organic-batteries
#19
Rafael B Araujo, Amitava Banerjee, Puspamitra Panigrahi, Li Yang, Martin Sjödin, Maria Strømme, C Moyses Araujo, Rajeev Ahuja
Conducting polymers are being considered promising candidates for sustainable organic batteries mainly due to their fast electron transport properties and high recyclability. In this work, the key properties of polythiophene and polypyridine have been assessed through a combined theoretical and experimental study focusing on such applications. A theoretical protocol has been developed to calculate redox potentials in solution within the framework of the density functional theory and using continuous solvation models...
January 16, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28091557/the-same-oculomotor-vermal-purkinje-cells-encode-the-different-kinematics-of-saccades-and-of-smooth-pursuit-eye-movements
#20
Zongpeng Sun, Aleksandra Smilgin, Marc Junker, Peter W Dicke, Peter Thier
Saccades and smooth pursuit eye movements (SPEM) are two types of goal-directed eye movements whose kinematics differ profoundly, a fact that may have contributed to the notion that the underlying cerebellar substrates are separated. However, it is suggested that some Purkinje cells (PCs) in the oculomotor vermis (OMV) of monkey cerebellum may be involved in both saccades and SPEM, a puzzling finding in view of the different kinematic demands of the two types of eye movements. Such 'dual' OMV PCs might be oddities with little if any functional relevance...
January 16, 2017: Scientific Reports
keyword
keyword
53230
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"