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https://www.readbyqxmd.com/read/28922115/colour-constancy-beyond-the-classical-receptive-field
#1
Arash Akbarinia, C Alejandro Parraga
The problem of removing illuminant variations to preserve the colours of objects (colour constancy) has already been solved by the human brain using mechanisms that rely largely on centre-surround computations of local contrast. In this paper we adopt some of these biological solutions described by long known physiological findings into a simple, fully automatic, functional model (termed Adaptive Surround Modulation or ASM). In ASM, the size of a visual neuron's receptive field (RF) as well as the relationship with its surround varies according to the local contrast within the stimulus, which in turn determines the nature of the centre-surround normalisation of cortical neurons higher up in the processing chain...
September 18, 2017: IEEE Transactions on Pattern Analysis and Machine Intelligence
https://www.readbyqxmd.com/read/28921980/benchmark-of-dynamic-electron-correlation-models-for-seniority-zero-wavefunctions-and-their-application-to-thermochemistry
#2
Katharina Boguslawski, Pawel Tecmer
Wave functions restricted to electron-pair states are promising models to describe static/nondynamic electron correlation effects encountered, for instance, in bond-dissociation processes and transition-metal and actinide chemistry. To reach spectroscopic accuracy, however, the missing dynamic electron correlation effects that cannot be described by electron-pair states need to be included a posteriori. In this article, we extend the previously presented perturbation theory models with an Antisymmetric Product of 1-reference orbital Geminal (AP1roG) reference function that allow us to describe both static/nondynamic and dynamic electron correlation effects...
September 18, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28921541/automatic-labeling-of-mr-brain-images-through-extensible-learning-and-atlas-forests
#3
Lijun Xu, Hong Liu, Enmin Song, Meng Yan, Renchao Jin, Chih-Cheng Hung
PURPOSE: Multi-atlas-based method is extensively used in MR brain images segmentation because of its simplicity and robustness. This method provides excellent accuracy while time-consuming and limited in terms of obtaining information about new atlases. In this study, an automatic labeling of MR brain images through extensible learning and atlas forest is presented to address these limitations. METHODS: We propose an extensible learning model which allows the multi-atlas-based framework capable of managing the datasets with numerous atlases or dynamic atlas datasets and simultaneously ensure the accuracy of automatic labeling...
September 18, 2017: Medical Physics
https://www.readbyqxmd.com/read/28920913/adaptive-control-via-neural-output-feedback-for-a-class-of-nonlinear-discrete-time-systems-in-a-nested-interconnected-form
#4
Dong-Juan Li, Da-Peng Li
In this paper, an adaptive output feedback control is framed for uncertain nonlinear discrete-time systems. The considered systems are a class of multi-input multioutput nonaffine nonlinear systems, and they are in the nested lower triangular form. Furthermore, the unknown dead-zone inputs are nonlinearly embedded into the systems. These properties of the systems will make it very difficult and challenging to construct a stable controller. By introducing a new diffeomorphism coordinate transformation, the controlled system is first transformed into a state-output model...
September 14, 2017: IEEE Transactions on Cybernetics
https://www.readbyqxmd.com/read/28917392/description-of-a-multi-university-education-and-collaborative-care-child-psychiatry-access-program-new-york-state-s-cap-pc
#5
D L Kaye, V Fornari, M Scharf, W Fremont, R Zuckerbrot, C Foley, T Hargrave, B A Smith, J Wallace, G Blakeslee, J Petras, S Sengupta, J Singarayer, A Cogswell, I Bhatia, P Jensen
OBJECTIVE: Although, child mental health problems are widespread, few get adequate treatment, and there is a severe shortage of child psychiatrists. To address this public health need many states have adopted collaborative care programs to assist primary care to better assess and manage pediatric mental health concerns. This report adds to the small literature on collaborative care programs and describes one large program that covers most of New York state. PROGRAM DESCRIPTION: CAP PC, a component program of New York State's Office of Mental Health (OMH) Project TEACH, has provided education and consultation support to primary care providers covering most of New York state since 2010...
September 2017: General Hospital Psychiatry
https://www.readbyqxmd.com/read/28916764/rapid-and-reversible-epigenome-editing-by-endogenous-chromatin-regulators
#6
Simon M G Braun, Jacob G Kirkland, Emma J Chory, Dylan Husmann, Joseph P Calarco, Gerald R Crabtree
Understanding the causal link between epigenetic marks and gene regulation remains a central question in chromatin biology. To edit the epigenome we developed the FIRE-Cas9 system for rapid and reversible recruitment of endogenous chromatin regulators to specific genomic loci. We enhanced the dCas9-MS2 anchor for genome targeting with Fkbp/Frb dimerizing fusion proteins to allow chemical-induced proximity of a desired chromatin regulator. We find that mSWI/SNF (BAF) complex recruitment is sufficient to oppose Polycomb within minutes, leading to activation of bivalent gene transcription in mouse embryonic stem cells...
September 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/28915352/all-atom-simulations-reveal-protein-charge-decoration-in-the-folded-and-unfolded-ensemble-is-key-in-thermophilic-adaptation
#7
Lucas Sawle, Jonathan Huihui, Kingshuk Ghosh
Thermophilic proteins denature at much higher temperature compared to their mesophilic homologues, in spite of high structural and sequential similarity. Computational approaches to understand this puzzle faces three major challenges: i) unfolded ensembles are usually neglected, ii) simulation studies of the folded states are often too short and iii) majority of investigations focus on a few protein pairs, obscuring the prevalence of different strategies across multiple protein systems. We address these concerns by carrying out all-atom simulations to characterize physicochemical properties of both the folded and disordered ensemble in multiple (12) thermophilic-mesophilic homologous protein pairs...
September 15, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28914928/multi-resonant-lugiato-lefever-model
#8
Matteo Conforti, Fabio Biancalana
We introduce a new model that extends the Lugiato-Lefever equation to the description of multiple resonances in Kerr optical cavities. It perfectly agrees quantitatively (in both stationary and dynamical regimes) with the exact Ikeda map, even when using a small number of resonances. Our model predicts the onset of complex phenomena such as the recently observed super-cavity solitons and the coexistence of multiple nonlinear states. It will be of crucial importance for the analytical understanding of new nonlinear phenomena in Kerr cavities when the intensities or nonlinearities are high enough to be able to excite more than one cavity resonance...
September 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28914358/dynamic-foraging-of-a-top-predator-in-a-seasonal-polar-marine-environment
#9
Ben G Weinstein, Ari S Friedlaender
The seasonal movement of animals at broad spatial scales provides insight into life-history, ecology and conservation. By combining high-resolution satellite-tagged data with hierarchical Bayesian movement models, we can associate spatial patterns of movement with marine animal behavior. We used a multi-state mixture model to describe humpback whale traveling and area-restricted search states as they forage along the West Antarctic Peninsula. We estimated the change in the geography, composition and characteristics of these behavioral states through time...
September 15, 2017: Oecologia
https://www.readbyqxmd.com/read/28912635/profile-of-justice-involved-marijuana-and-other-substance-users-demographics-health-and-health-care-family-and-justice-system-experiences
#10
REVIEW
Nikki Freeman, Justin Landwehr, Tasseli McKay, James Derzon, Anupa Bir
Substance users are more likely to have co-occurring health problems, and this pattern is intensified among those involved with the criminal justice system. Interview data for 1977 incarcerated men in 5 states from the Multi-site Family Study on Incarceration, Parenting, and Partnering that was conducted between December 2008 and August 2011 were analyzed to compare pre-incarceration substance use patterns and health outcomes between men who primarily used marijuana, primarily used alcohol, primarily used other drugs, and did not use any illicit substances during that time...
2017: Substance Abuse: Research and Treatment
https://www.readbyqxmd.com/read/28911800/evolution-of-the-sex-ratio-and-effective-number-under-gynodioecy-and-androdioecy
#11
Marcy K Uyenoyama, Naoki Takebayashi
We address the evolution of effective number of individuals under androdioecy and gynodioecy. We analyze dynamic models of autosomal modifiers of weak effect on sex expression. In our zygote control models, the sex expressed by a zygote depends on its own genotype, while in our maternal control models, it depends on the genotype of its maternal parent. Our analysis unifies full multi-dimensional local stability analysis with the Li-Price equation, which for all its heuristic appeal, describes evolutionary change over a single generation...
September 11, 2017: Theoretical Population Biology
https://www.readbyqxmd.com/read/28903016/arthroscopic-meniscectomy-for-degenerative-meniscal-tears-reduces-knee-pain-but-is-not-cost-effective-in-a-routine-health-care-setting-a-multi-center-longitudinal-observational-study-using-data-from-the-osteoarthritis-initiative
#12
Jan J Rongen, Tim M Govers, Pieter Buma, Maroeska M Rovers, Gerjon Hannink
OBJECTIVES: It is disputed whether arthroscopic meniscectomy is an (cost-) effective treatment for degenerative meniscus tears in day-to-day clinical practice. The objective of this study was to assess the cost-effectiveness of arthroscopic meniscectomy in subjects with knee osteoarthritis, in routine clinical practice, while taking into account the increased risk for future knee replacement surgery. We compared cost-effectiveness of arthroscopic meniscectomy compared to no surgery. DESIGN: - We used a state transition (Markov) simulation model to evaluate the cost-effectiveness of arthroscopic meniscectomy compared to no surgery in subjects with knee osteoarthritis (age range 45- 79 years)...
September 10, 2017: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/28902466/learning-based-deformable-registration-for-infant-mri-by-integrating-random-forest-with-auto-context-model
#13
Lifang Wei, Xiaohuan Cao, Zhensong Wang, Yaozong Gao, Shunbo Hu, Li Wang, Guorong Wu, Dinggang Shen
PURPOSE: Accurately analyzing the rapid structural evolution of human brain in the first year of life is a key step in early brain development studies, which requires accurate deformable image registration. However, due to 1) dynamic appearance and 2) large anatomical changes, very few methods in the literature can work well for the registration of two infant brain MR images acquired at two arbitrary development phases, such as birth and one-year-old. METHODS: To address these challenging issues, we propose a learning-based registration method, which can handle the anatomical structures and the appearance changes between the two infant brain MR images with possible time gap...
September 13, 2017: Medical Physics
https://www.readbyqxmd.com/read/28895758/medication-adherence-and-discontinuation-of-long-acting-injectable-versus-oral-antipsychotics-in-patients-with-schizophrenia-or-bipolar-disorder
#14
Mallik Greene, Jessie Tingjian Yan, Eunice Chang, Ann Hartry, Maëlys Touya, Michael S Broder
AIMS: To examine medication adherence and discontinuation in two separate groups of patients with schizophrenia or bipolar disorder (BD), who initiated a long-acting injectable (LAI) antipsychotic versus those who changed to a different oral antipsychotic monotherapy. MATERIALS AND METHODS: The Truven Health Analytics MarketScan Multi-State Medicaid claims database was used to identify patients with schizophrenia. Both Truven Health Analytics MarketScan Commercial and Medicaid claims databases were used to identify patients with BD...
September 12, 2017: Journal of Medical Economics
https://www.readbyqxmd.com/read/28895271/multi-model-comparison-highlights-consistency-in-predicted-effect-of-warming-on-a-semi-arid-shrub
#15
Katherine M Renwick, Caroline Curtis, Andrew R Kleinhesselink, Daniel Schlaepfer, Bethany A Bradley, Cameron L Aldridge, Benjamin Poulter, Peter B Adler
A number of modeling approaches have been developed to predict the impacts of climate change on species distributions, performance and abundance. The stronger the agreement from models that represent different processes and are based on distinct and independent sources of information, the greater the confidence we can have in their predictions. Evaluating the level of confidence is particularly important when predictions are used to guide conservation or restoration decisions. We used a multi-model approach to predict climate change impacts on big sagebrush (Artemisia tridentata), the dominant plant species on roughly 43 million hectares in the western United States and a key resource for many endemic wildlife species...
September 12, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28892864/multi-sensor-satellite-and-in-situ-monitoring-of-phytoplankton-development-in-a-eutrophic-mesotrophic-lake
#16
Katja Dörnhöfer, Philip Klinger, Thomas Heege, Natascha Oppelt
Phytoplankton indicated by its photosynthetic pigment chlorophyll-a is an important pointer on lake ecology and a regularly monitored parameter within the European Water Framework Directive. Along with eutrophication and global warming cyanobacteria gain increasing importance concerning human health aspects. Optical remote sensing may support both the monitoring of horizontal distribution of phytoplankton and cyanobacteria at the lake surface and the reduction of spatial uncertainties associated with limited water sample analyses...
September 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28892843/emd-regression-for-modelling-multi-scale-relationships-and-application-to-weather-related-cardiovascular-mortality
#17
Pierre Masselot, Fateh Chebana, Diane Bélanger, André St-Hilaire, Belkacem Abdous, Pierre Gosselin, Taha B M J Ouarda
In a number of environmental studies, relationships between nat4ural processes are often assessed through regression analyses, using time series data. Such data are often multi-scale and non-stationary, leading to a poor accuracy of the resulting regression models and therefore to results with moderate reliability. To deal with this issue, the present paper introduces the EMD-regression methodology consisting in applying the empirical mode decomposition (EMD) algorithm on data series and then using the resulting components in regression models...
September 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28892185/prevalence-comorbidities-and-mortality-of-toxic-shock-syndrome-in-united-states-children-and-adults
#18
Mark A Strom, Derek Y Hsu, Jonathan I Silverberg
Toxic Shock Syndrome (TSS) is a superantigen-mediated illness characterized by rash, hypotension and multi-organ dysfunction. The predictors of TSS and related morbidity and mortality are poorly defined. We analyzed data on 61,959,084 hospitalizations from the 2003-2012 Nationwide Inpatient Sample, a 20% stratified sample of US hospitalizations. ICD-9-CM coding was used to identify 4,491 hospitalizations with a diagnosis of TSS. Incidence, in-hospital mortality rate, comorbidities, length of stay and costs of care due to TSS were determined...
September 11, 2017: Microbiology and Immunology
https://www.readbyqxmd.com/read/28891937/the-impact-of-a-city-level-minimum-wage-policy-on-supermarket-food-prices-in-seattle-king-county
#19
Jennifer J Otten, James Buszkiewicz, Wesley Tang, Anju Aggarwal, Mark Long, Jacob Vigdor, Adam Drewnowski
Background: Many states and localities throughout the U.S. have adopted higher minimum wages. Higher labor costs among low-wage food system workers could result in higher food prices. Methods: Using a market basket of 106 foods, food prices were collected at affected chain supermarket stores in Seattle and same-chain unaffected stores in King County (n = 12 total, six per location). Prices were collected at 1 month pre- (March 2015) and 1-month post-policy enactment (May 2015), then again 1-year post-policy enactment (May 2016)...
September 9, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28891512/decoding-of-visual-activity-patterns-from-fmri-responses-using-multivariate-pattern-analyses-and-convolutional-neural-network
#20
Raheel Zafar, Nidal Kamel, Mohamad Naufal, Aamir Saeed Malik, Sarat C Dass, Rana Fayyaz Ahmad, Jafri M Abdullah, Faruque Reza
Decoding of human brain activity has always been a primary goal in neuroscience especially with functional magnetic resonance imaging (fMRI) data. In recent years, Convolutional neural network (CNN) has become a popular method for the extraction of features due to its higher accuracy, however it needs a lot of computation and training data. In this study, an algorithm is developed using Multivariate pattern analysis (MVPA) and modified CNN to decode the behavior of brain for different images with limited data set...
2017: Journal of Integrative Neuroscience
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