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Results 201 - 250 of 6551
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Snavely Anna C AC Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, U.S.A.; UNC Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, - - 2014
Multiple outcomes are often collected in applications where the quantity of interest cannot be measured directly or is difficult or expensive to measure. In a head and neck cancer study conducted at Dana-Farber Cancer Institute, the investigators wanted to determine the effect of clinical and treatment factors on unobservable dysphagia ...
Vannitsem Stéphane S Institut Royal Météorologique de Belgique, Avenue circulaire 3, 1180 Brussels, Belgium - - 2014
There is a growing interest in developing stochastic schemes for the description of processes that are poorly represented in atmospheric and climate models, in order to increase their variability and reduce the impact of model errors. The use of such noise could however have adverse effects by modifying in undesired ...
Lepage Kyle Q KQ Boston University, Department of Mathematics and Statistics, Boston, MA, USA. Electronic address: - - 2014
The electroencephalogram (EEG) remains the primary tool for diagnosis of abnormal brain activity in clinical neurology and for in vivo recordings of human neurophysiology in neuroscience research. In EEG data acquisition, voltage is measured at positions on the scalp with respect to a reference electrode. When this reference electrode responds ...
Durrleman Stanley S INRIA, Project-Team Aramis, Centre Paris-Rocquencourt, France; Sorbonne Universités, UPMC Université Paris 06, UMR S 1127, ICM, Paris, France; Inserm, U1127, ICM, Paris, France; CNRS, UMR 7225, ICM, Paris, France; Institut du Cerveau et de la Moëlle Épinière (ICM), Hôpital de la Pitié Salpêtrière, 75013 Paris, - - 2014
We propose a generic method for the statistical analysis of collections of anatomical shape complexes, namely sets of surfaces that were previously segmented and labeled in a group of subjects. The method estimates an anatomical model, the template complex, that is representative of the population under study. Its shape reflects ...
Gan Min - - 2014
The radial basis function network-based autoregressive with exogenous inputs (RBF-ARX) models have much more linear parameters than nonlinear parameters. Taking advantage of this special structure, a variable projection algorithm is proposed to estimate the model parameters more efficiently by eliminating the linear parameters through the orthogonal projection. The proposed method ...
Wilson Dan D Department of Mechanical Engineering, University of California, Santa Barbara, CA, 93106, USA, - - 2014
We use Hamilton-Jacobi-Bellman methods to find minimum-time and energy-optimal control strategies to terminate seizure-like bursting behavior in a conductance-based neural model. Averaging is used to eliminate fast variables from the model, and a target set is defined through bifurcation analysis of the slow variables of the model. This method is ...
Ayachi F S FS Multimodal Interaction Laboratory, SIS-McGill University, Montreal, Canada, - - 2014
In this work, we propose to classify, by simulation, the shape variability (or non-Gaussianity) of the surface electromyogram (sEMG) amplitude probability density function (PDF), according to contraction level, using high-order statistics (HOS) and a recent functional formalism, the core shape modeling (CSM). According to recent studies, based on simulated and/or ...
Tekwe Carmen D CD Department of Epidemiology and Biostatistics, Texas A&M University, 1266 TAMU, College Station, TX, 77843-1266, - - 2014
Multiple indicators, multiple causes (MIMIC) models are often employed by researchers studying the effects of an unobservable latent variable on a set of outcomes, when causes of the latent variable are observed. There are times, however, when the causes of the latent variable are not observed because measurements of the ...
Sengül Sevgi S Department of Mathematics, Florida State University, Tallahassee, FL, 32306-4510, USA, - - 2014
The Hodgkin-Huxley (HH) model is the basis for numerous neural models. There are two negative feedback processes in the HH model that regulate rhythmic spiking. The first is an outward current with an activation variable n that has an opposite influence to the excitatory inward current and therefore provides subtractive ...
Levakova Marie M Department of Mathematics and Statistics, Faculty of Science, Masaryk University, Kotlarska 2, 611 37 , Brno, Czech Republic, - - 2014
Stimulus response latency is the time period between the presentation of a stimulus and the occurrence of a change in the neural firing evoked by the stimulation. The response latency has been explored and estimation methods proposed mostly for excitatory stimuli, which means that the neuron reacts to the stimulus ...
Jiang Yu Y Control and Networks Laboratory, Department of Electrical and Computer Engineering, Polytechnic School of Engineering, New York University, 5 Metrotech Center, Brooklyn, NY , 11201, - - 2014
Many characteristics of sensorimotor control can be explained by models based on optimization and optimal control theories. However, most of the previous models assume that the central nervous system has access to the precise knowledge of the sensorimotor system and its interacting environment. This viewpoint is difficult to be justified ...
Mahajan Ruhi - - 2014
Brain activities commonly recorded using the Electroencephalogram (EEG) is contaminated with ocular artifacts. These activities can be suppressed using a robust Independent Component Analysis (ICA) tool, but its efficiency relies on manual intervention to accurately identify the independent artifactual components. In this paper, we present a new unsupervised, robust and ...
Haxby James V JV Department of Psychological and Brain Sciences, Center for Cognitive Neuroscience, Dartmouth College, Hanover, NH 03755 and Center for Mind/Brain Sciences (CIMeC), University of Trento, Rovereto, Trentino 38068, Italy; email: - - 2014
A major challenge for systems neuroscience is to break the neural code. Computational algorithms for encoding information into neural activity and extracting information from measured activity afford understanding of how percepts, memories, thought, and knowledge are represented in patterns of brain activity. The past decade and a half has seen ...
Bonotto D M DM Departamento de Petrologia e Metalogenia, Universidade Estadual Paulista (UNESP), Av. 24-A No. 1515, C.P. 178, CEP 13506-900, Rio Claro, São Paulo, Brazil. Electronic address: - - 2014
The Constant Flux: Constant Sedimentation (CF:CS) and Constant Rate of Supply (CRS) of unsupported⧸excess (210)Pb models have been applied to a (210)Pb data set providing of eighteen sediments profiles sampled at four riverine systems occurring in Brazil, South America: Corumbataí River basin (S1=Site 1, São Paulo State), Atibaia River basin ...
Barrett Jonathan J Department of Computer Science, University of Oxford, Oxford OX1 3QD, United - - 2014
According to a recent no-go theorem [M. Pusey, J. Barrett and T. Rudolph, Nat. Phys. 8, 475 (2012)], models in which quantum states correspond to probability distributions over the values of some underlying physical variables must have the following feature: the distributions corresponding to distinct quantum states do not overlap. ...
Vuillerot Carole C Hospices Civils de Lyon, Hôpital Femme-Mère-Enfant, L'Escale, Service de Médecine Physique et de Réadaptation Pédiatrique, Bron, F-69500, France; Université de Lyon, Lyon, F-69000, France; Université Lyon I, Villeurbanne, F-69100, France; CNRS UMR 5558, Laboratoire de Biométrie et Biologie Evolutive, Equipe Biostatistique Santé, Pierre-Bénite, F-69310, France; National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20814, USA. Electronic address: - - 2014
To monitor treatment effects in patients with congenital myopathies and congenital muscular dystrophies, valid outcome measures are necessary. The Motor Function Measure was examined for robustness and changes are proposed for better adequacy. Observational study based on data previously collected from several cohorts. Nineteen departments of physical medicine or neuromuscular ...
Chandra Hukum H Indian Agricultural Statistics Research Institute, Library Avenue, New Delhi, 110012, - - 2014
Survey data often contain measurements for variables that are semicontinuous in nature, i.e. they either take a single fixed value (we assume this is zero) or they have a continuous, often skewed, distribution on the positive real line. Standard methods for small area estimation (SAE) based on the use of ...
Zhu Huicen H School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, - - 2014
Although some researches about the degradation of organic pollutants have been carried out during recent years, reaction rate constants are available only for homologue compounds with similar structures or components. Therefore, it is of great significance to find a universal relationship between reaction rate and certain parameters of several diverse ...
Khoobi Asma A Department of Analytical Chemistry, Faculty of Chemistry, University of Kashan, P.O. Box 87317-51167, Kashan, I.R. Iran. - - 2014
A highly sensitive electrochemical nanosensor was developed using covalent modification of a glassy carbon electrode (GCE) by self-assembly of a novel Schiff base. Scanning electron microscopy (SEM) and electrochemical techniques were used to investigate the immobilization of the self-assembled monolayer (SAM) on the GCE. The electrochemical behavior of hydroxychloroquine (HCQ) ...
Dimovski Karolina K Microbiological Diagnostic Unit Public Health Laboratory, University of Melbourne, Parkville, Victoria, - - 2014
Variable number tandem repeats (VNTRs) mutate rapidly and can be useful markers for genotyping. While multi-locus VNTR analysis (MLVA) is increasingly used in the detection and investigation of foodborne outbreaks caused by Salmonella enterica serovar Typhimurium (S. Typhimurium) and other bacterial pathogens, MLVA data analysis usually relies on simple clustering ...
Zaheri Maryam M Department of Ecology and Evolution, University of Lausanne, 1015 Lausanne, SwitzerlandSwiss Institute of Bioinformatics, Quartier Sorge, 1015 Lausanne, - - 2014
Models of codon evolution have attracted particular interest because of their unique capabilities to detect selection forces and their high fit when applied to sequence evolution. We described here a novel approach for modeling codon evolution, which is based on Kronecker product of matrices. The 61 × 61 codon substitution ...
Mansal Fulgence F Département de mathématiques et informatique, Faculté des Sciences et techniques, UMI IRD 209, UMMISCO, IRD, Université Cheikh Anta Diop, Dakar, Senegal, - - 2014
We present a mathematical bioeconomic model of a fishery with a variable price. The model describes the time evolution of the resource, the fishing effort and the price which is assumed to vary with respect to supply and demand. The supply is the instantaneous catch while the demand function is ...
Zhang Yongguang Y Institute for Space Sciences, Free University of Berlin, - - 2014
Photosynthesis simulations by terrestrial biosphere models are usually based on the Farquhar's model, in which the maximum rate of carboxylation (Vcmax ) is a key control parameter of photosynthetic capacity. Even though Vcmax is known to vary substantially in space and time in response to environmental controls, it is typically ...
Saint-Pierre Aude A INSERM U1078, Etablissement Français du Sang, Brest, - - 2014
Background: Linkage analysis on extended pedigrees is often challenged by the high computational demand of exact identity-by-descent (IBD) matrix reconstruction. When such an analysis becomes not feasible, two alternative solutions are contrasted: a full pedigree analysis based on approximate IBD estimation versus a pedigree splitting followed by exact IBD estimation. ...
Schlageter-Tello Andrés A Wageningen UR Livestock Research, P.O. Box 65, 8200 AB Lelystad, The Netherlands. Electronic address: - - 2014
The objective of this review was to describe, compare and evaluate agreement, reliability, and validity of manual and automatic locomotion scoring systems (MLSSs and ALSSs, respectively) used in dairy cattle lameness research. There are many different types of MLSSs and ALSSs. Twenty-five MLSSs were found in 244 articles. MLSSs use ...
Concordet D D INRA-ENVT, UMR1331 Toxalim Research Centre in Food Toxicology, Université de Toulouse, F-31027 Toulouse, - - 2014
Follow-up is more and more used in medicine/doping control to identify abnormal results in an individual. Currently, follow-ups are mostly carried out variable by variable using "reference intervals" that contain the values observable in 100(1-α)% of healthy/undoped individuals. Observations of the evolution of the variables over time in a sample ...
Dubay Rickey R Department of Mechanical Engineering, 15 Dineen Drive, P.O. Box 4400, University of New Brunswick, Fredericton, NB, Canada E3B5A3. Electronic address: - - 2014
This paper presents a unique approach for active vibration control of a one-link flexible manipulator. The method combines a finite element model of the manipulator and an advanced model predictive controller to suppress vibration at its tip. This hybrid methodology improves significantly over the standard application of a predictive controller ...
Fay Kellie - - 2014
Measured rates of intrinsic clearance determined using cryopreserved trout hepatocytes can be extrapolated to the whole animal as a means of improving modeled bioaccumulation predictions for fish. To date, however, the intra- and inter-laboratory reliability of this procedure has not been determined. In the present study, three laboratories determined in ...
Tenan Matthew S MS Department of Kinesiology and Health Education, University of Texas at Austin, Austin, Texas, USA; United States Army Research Laboratory-Human Research and Engineering Directorate, Aberdeen Proving Ground, Maryland, - - 2014
Heart rate variability (HRV) is a noninvasive indicator of autonomic control. This study examines HRV changes across a normal menstrual cycle and proposes a novel piecewise function controlling for the effects of breathing on HRV spectral parameters. A resting ECG was collected from 13 women at five points in their ...
Filingeri Davide D Loughborough University - - 2014
Although the ability to sense skin wetness and humidity is critical for behavioral and autonomic adaptations, humans are not provided with specific skin receptors for sensing wetness. It has been proposed that we "learn" to perceive the wetness experienced when the skin is in contact with a wet surface or ...
Dama James F JF Department of Chemistry, James Franck Institute, Institute for Biophysical Dynamics, and Computation Institute, University of Chicago, Chicago, Illinois 60637, - - 2014
Metadynamics is a versatile and capable enhanced sampling method for the computational study of soft matter materials and biomolecular systems. However, over a decade of application and several attempts to give this adaptive umbrella sampling method a firm theoretical grounding prove that a rigorous convergence analysis is elusive. This Letter ...
Van Der Lingen C D CD Offshore Resources Research, Fisheries Management Branch, Department of Agriculture, Forestry and Fisheries, Private Bag X2, Rogge Bay 8012, South Africa; Marine Research Institute, University of Cape Town, Private Bag X3, Rondebosch 7701, South - - 2014
General linear models (GLMs) were used to determine the relative importance of interspecific, ontogenetic and spatial effects in explaining variability in stable isotope ratios of nitrogen (δ(15) N) and carbon (δ(13) C) of the co-occurring Cape hakes Merluccius capensis and Merluccius paradoxus off South Africa. Significant GLMs were derived for ...
Antoñanzas Fernando F Departamento de Economía y Empresa, University of La Rioja, Cigüeña 60, 26004-Logroño, - - 2014
This paper acknowledges the difficulties of providing access to innovative drugs in some jurisdictions under the patent system and it contributes to the current debate on mechanisms aimed at facilitating such access. We employ a highly stylized static model of two markets (North and South) to analyse the conditions under ...
Hu Meng M School of Biomedical Engineering, Science & Health Systems, Drexel University, Philadelphia, PA 19104, - - 2014
In neuroscience, as in many other fields of science and engineering, it is crucial to assess the causal interactions among multivariate time series. Granger causality has been increasingly used to identify causal influence between time series based on multivariate autoregressive models. Such an approach is based on linear regression framework ...
Hansson Sophia V SV Department of Ecology and Environmental Science, Umeå University, SE-901 87 Umeå, Sweden. Electronic address: - - 2014
Accurate dating of peat accumulation is essential for quantitatively reconstructing past changes in atmospheric metal deposition and carbon burial. By analyzing fallout radionuclides (210)Pb, (137)Cs, (241)Am, and (7)Be, and total Pb and Hg in 5 cores from two Swedish peatlands we addressed the consequence of estimating accumulation rates due to ...
Li Juan J Key Laboratory of Measurement and Control of Complex Systems of Engineering, Ministry of Education, School of Automation, Southeast University, Nanjing 210096, PR China; School of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou 225127, PR China. Electronic address: - - 2014
An adaptive control strategy combining neural network inverse controller (NNIC) with RBFN disturbance observer (RBFNDOB) is developed for a multi-input-multi-output (MIMO) system with non-minimum phase, internal and external disturbances in this paper. Since the inverse model of system is unstable due to the non-minimum phase, a pseudo-plant is constructed, then ...
He Ren - - 2014
It is common in applied research to have large numbers of variables measured on a modest number of cases. Even with low rates of missingness of individual variables, such data sets can have a large number of incomplete cases with a mix of data types. Here, we propose a new ...
Borgen Nicolai T NT Department of Sociology and Human Geography, University of Oslo, Norway. Electronic address: - - 2014
This paper addresses the recent discussion on confounding in the returns to college quality literature using the Norwegian case. The main advantage of studying Norway is the quality of the data. Norwegian administrative data provide information on college applications, family relations and a rich set of control variables for all ...
Leino Tony T Department of Clinical Psychology, University of Bergen, Christiesgate 12, 5015, Bergen, Norway, - - 2014
The aim of this study was to examine the relationship between the structural characteristics and gambling behavior among video lottery terminal (VLT) gamblers. The study was ecological valid, because the data consisted of actual gambling behavior registered in the participants natural gambling environment without intrusion by researchers. Online behavioral tracking ...
Nygren David - - 2014
Plasmodium falciparum transmission has decreased significantly in Zambia in the last decade. The malaria transmission is influenced by environmental variables. Incorporation of environmental variables in models of malaria transmission likely improves model fit and predicts probable trends in malaria disease. This work is based on the hypothesis that remotely-sensed environmental ...
Dangi Siddharth S Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, Berkeley, CA 94720, U.S.A. - - 2014
Closed-loop decoder adaptation (CLDA) is an emerging paradigm for both improving and maintaining online performance in brain-machine interfaces (BMIs). The time required for initial decoder training and any subsequent decoder recalibrations could be potentially reduced by performing continuous adaptation, in which decoder parameters are updated at every time step during ...
Shahbaba Babak B Department of Statistics, UC Irvine, CA 92697, U.S.A. - - 2014
We propose a scalable semiparametric Bayesian model to capture dependencies among multiple neurons by detecting their cofiring (possibly with some lag time) patterns over time. After discretizing time so there is at most one spike at each interval, the resulting sequence of 1s (spike) and 0s (silence) for each neuron ...
Jayaswal Vivek V School of Biomedical Sciences, Queensland University of Technology, Brisbane, QLD 4000, Australia; School of Mathematics and Statistics, University of Sydney, Sydney, NSW 2006, - - 2014
Molecular phylogenetic studies of homologous sequences of nucleotides often assume that the underlying evolutionary process was globally stationary, reversible and homogeneous (SRH), and that a model of evolution with one or more site-specific and time-reversible rate matrices (e.g., the GTR rate matrix) is enough to accurately model the evolution of ...
Dash Shishir - - 2014
This paper presents novel methods for classification of fetal heart rate (FHR) signals into categories that are meaningful for clinical implementation. They are based on generative models (GMs) and Bayesian theory. Instead of using scalar features that summarize information obtained from long-duration data, the models allow for explicit use of ...
Axelsson A A Swedish Defence Research Agency (FOI), SE-16490 Stockholm, - - 2014
Motivated by the need for consistent use of concepts central to the reporting of results from measurements of atmospheric radioactivity, we discuss some properties of the methods commonly used. Different expressions for decay correction of the activity concentration for parent-daughter decay pairs are presented, and it is suggested that this ...
Baba Yuki G YG Biodiversity Division, National Institute for Agro-Environmental Sciences, 3-1-3 Kannondai, Tsukuba-shi, Ibaraki, 305-8604, Japan, - - 2014
Cyrtarachne is an orb-weaving spider belonging to the subfamily Cyrtarachninae (Araneidae) which includes triangular-web-building Pasilobus and bolas spiders. The Cyrtarachninae is a group of spiders specialized in catching moths, which is thought to have evolved from ordinary orb-weaving araneids. Although the web-building time of nocturnal spiders is in general related ...
Stajic J M JM Faculty of Science, University of Kragujevac, Kragujevac, - - 2014
Measuring of radon and thoron progeny concentrations in air, based on air filtration, was analysed in order to assess the reliability of the method. Changes of radon and thoron progeny activities on the filter during and after air sampling were investigated. Simulation experiments were performed involving realistic measuring parameters. The ...
JiefengJiang Center for Cognitive Neuroscience, Duke University; Department of Psychology & Neuroscience, Duke - - 2014
"Cognitive control" describes endogenous guidance of behavior in situations where routine stimulus-response associations are suboptimal for achieving a desired goal. The computational and neural mechanisms underlying this capacity remain poorly understood. We examine recent advances stemming from the application of a Bayesian learner perspective that provides optimal prediction for control ...
Baygi Mahdi Oloumi MO Department of Electrical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran. Electronic address: - - 2014
Applying the min-projection strategy (MPS) to a three-phase grid-connected inverter to improve its transient performance is the main objective of this paper. For this purpose, the inverter is first modeled as a switched linear system. Then, the feasibility of the MPS technique is investigated and the stability criterion is derived. ...
Hevelke Alexander A Lehrstuhl für Philosophie IV, Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539, Munich, Germany, - - 2014
A number of companies including Google and BMW are currently working on the development of autonomous cars. But if fully autonomous cars are going to drive on our roads, it must be decided who is to be held responsible in case of accidents. This involves not only legal questions, but ...
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