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Results 451 - 500 of 3138
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Caruel M - - 2013
Complex 3D beating heart models are now available, but their complexity makes calibration and validation very difficult tasks. We thus propose a systematic approach of deriving simplified reduced-dimensional models, in "0D"-typically, to represent a cardiac cavity, or several coupled cavities-and in "1D"-to model elongated structures such as muscle samples or ...
Brocchini Maurizio M D.I.C.E.A. , Università Politecnica delle Marche , Via Brecce Bianche 12, 60131 Ancona, - - 2013
This paper, which is largely the fruit of an invited talk on the topic at the latest International Conference on Coastal Engineering, describes the state of the art of modelling by means of Boussinesq-type models (BTMs). Motivations for using BTMs as well as their fundamentals are illustrated, with special attention ...
Wang Kun - - 2013
Lopinavir (LPV)/ritonavir (RTV) co-formulation (LPV/RTV) is a widely used protease inhibitor (PI)-based regimen to treat HIV-infection. As with all PIs, the trough concentration (C trough) is a primary determinant of response, but the optimum exposure remains poorly defined. The primary objective was to develop an integrated LPV population pharmacokinetic model ...
Dutra José Diogo L - - 2013
In this study, we propose three different methods for calculation of Judd-Ofelt intensity parameters of poly-europium systems. The first, named Centroid Method, proposes the calculation considering the center of the dimeric system as the half distances between the two europium centers. The second method, called Overlapped Polyhedra Method, proposes the ...
Wagner S - - 2013
Objective. We investigate volume conduction effects in transcranial direct current stimulation (tDCS) and present a guideline for efficient and yet accurate volume conductor modeling in tDCS using our newly-developed finite element (FE) approach. Approach. We developed a new, accurate and fast isoparametric FE approach for high-resolution geometry-adapted hexahedral meshes and ...
Redal-Baigorri Belén - - 2013
Estimation of Glomerular Filtration Rate (GFR) by equations such as Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) or Modification of Diet in Renal Disease (MDRD) is usually expressed as a Body Surface Area (BSA) indexed value (ml/min per 1.73 m2). This can have severe clinical consequences in patients with extreme body ...
Camacho A A Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya, Avda. Diagonal, 647, 08028 Barcelona, Spain. Electronic address: - - 2013
The activities on air filters of the radionuclides (40)K and (137)Cs were measured in an above ground laboratory and compared with the activities measured in an underground laboratory. The average relative differences were lower than 20% for (137)Cs and (40)K. The temporal series of these radionuclides in the period 2006-2010 ...
Charman W Neil WN Faculty of Life Sciences, University of Manchester, Manchester M13 9PT, - - 2013
Lens average and equivalent refractive indices are required for purposes such as lens thickness estimation and optical modeling. We modeled the refractive index gradient as a power function of the normalized distance from lens center. Average index along the lens axis was estimated by integration. Equivalent index was estimated by ...
Yuan Xiaoru - - 2013
For high-dimensional data, this work proposes two novel visual exploration methods to gain insights into the data aspect and the dimension aspect of the data. The first is a Dimension Projection Matrix, as an extension of a scatterplot matrix. In the matrix, each row or column represents a group of ...
Hsu Wei-Hsien - - 2013
We present an integrated camera motion design and path generation system for building volume data animations. Creating animations is an essential task in presenting complex scientific visualizations. Existing visualization systems use an established animation function based on keyframes selected by the user. This approach is limited in providing the optimal ...
Khlebnikov Rostislav - - 2013
Analysis of multivariate data is of great importance in many scientific disciplines. However, visualization of 3D spatially-fixed multivariate volumetric data is a very challenging task. In this paper we present a method that allows simultaneous real-time visualization of multivariate data. We redistribute the opacity within a voxel to improve the ...
Martínez-Rego David - - 2013
A technique for adjusting a minimum volume set of covering ellipsoids technique is elaborated. Solutions to this problem have potential application in one-class classification and clustering problems. Its main original features are: 1) It avoids the direct evaluation of determinants by using diagonalization properties of the involved matrices, 2) it ...
Mukherjee Ryan - - 2013
We describe and compare several methods for recovering endocardial walls from 3-D transesophageal echocardiography (3-D TEE), which can help with diagnostics or providing input into biomechanical models. We employ a segmentation method based on 3-D level sets that maximizes enclosed volume while minimizing surface area and uses a growth inhibition ...
Shi Yue - - 2013
To present a predictive model of the registration tolerance for wavefront-guided correction to maintain acuity within fixed limits and demonstrate the potential utility using two typical keratoconic eyes. Change in log visual Strehl was plotted as a function of translation error for a series of rotations of a wavefront-guided correction. ...
Canavesi Cristina - - 2013
We propose a fast algorithm to estimate the flux collected by conic reflector patches, based on the calculation of intersections between neighboring patches. The algorithm can be employed in conjunction with the supporting ellipsoids algorithm for freeform reflector design and is shown to be orders of magnitude faster and more ...
Huang Yijian Y Department of Biostatistics and Bioinformatics, Emory - - 2013
Weighted log-rank estimating function has become a standard estimation method for the censored linear regression model, or the accelerated failure time model. Well established statistically, the estimator defined as a consistent root has, however, rather poor computational properties because the estimating function is neither continuous nor, in general, monotone. We ...
Mageed Mahmoud M Large Animal Clinic for Surgery, Faculty of Veterinary Medicine, University of Leipzig, Leipzig, Germany. ; Department of Surgery and Anaesthesia, Faculty of Veterinary Medicine, University of Khartoum, Khartoum North, - - 2013
Sheep are commonly used as a model for human spinal orthopaedic research due to their similarity in morphological and biomechanical features. This study aimed to document the volumes of vertebral bodies and compare the generated results as well as morphometry of the sheep lumbar spine to human published data. For ...
Kang Le L Center for Devices and Radiological Health, US Food and Drug Administration, Silver Spring, MD 20993, United - - 2013
With three ordinal diagnostic categories, the most commonly used measures for the overall diagnostic accuracy are the volume under the ROC surface (VUS) and partial volume under the ROC surface (PVUS), which are the extensions of the area under the ROC curve (AUC) and partial area under the ROC curve ...
Lindenstrand David - - 2013
Data, on the number of infected, gathered from a large epidemic outbreak can be used to estimate parameters related to the strength and speed of the spread. The Malthusian parameter, which determines the initial growth rate of the epidemic is often of crucial interest. Using a simple epidemic SEIR model ...
Panagiotou E E Department of Mathematics, University of California, Santa Barbara, California 93106, - - 2013
We propose a method to estimate N_{e}, the entanglement length, that incorporates both local and global topological characteristics of chains in a melt under equilibrium conditions. This estimate uses the writhe of the chains, the writhe of the primitive paths, and the number of kinks in the chains in a ...
Bo Shen - - 2013
In this paper, the H∞ state estimation problem is investigated for a class of complex networks with uncertain coupling strength and incomplete measurements. With the aid of the interval matrix approach, we make the first attempt to characterize the uncertainties entering into the inner coupling matrix. The incomplete measurements under ...
Yu Yao Y Department of Biostatistics and Computational Biology, University of Rochester, NY 14642, - - 2013
This paper is concerned with model selection and model averaging procedures for partially linear single-index models. The profile least squares procedure is employed to estimate regression coefficients for the full model and submodels. We show that the estimators for submodels are asymptotically normal. Based on the asymptotic distribution of the ...
Hornik Kurt K Institute for Statistics and Mathematics, WU Wirtschaftsuniversität Wien, Augasse 2-6, 1090 Vienna, - - 2013
We systematically investigate lower and upper bounds for the modified Bessel function ratio [Formula: see text] by functions of the form [Formula: see text] in case [Formula: see text] is positive for all [Formula: see text], or equivalently, where [Formula: see text] or [Formula: see text] is a negative integer. ...
Beyer Johanna J King Abdullah University of Science and - - 2013
This paper presents ConnectomeExplorer, an application for the interactive exploration and query-guided visual analysis of large volumetric electron microscopy (EM) data sets in connectomics research. Our system incorporates a knowledge-based query algebra that supports the interactive specification of dynamically evaluated queries, which enable neuroscientists to pose and answer domain-specific questions ...
Eze C U CU Department of Radiation Biology, Radiotherapy, Radiodiagnosis and Radiography, Faculty of Clinical Sciences, College of Medicine, University of Lagos, Idi-Araba, Lagos, Nigeria. - - 2013
To assess the level of inconsistency in replicating sonographic kidney size measurements in a population of healthy Nigerian children. In this prospective cross-sectional study, convenience sampling technique was used to select a sample of Nigerian children. Both consent from participants and ethical approval from the local authority were obtained before ...
Lange B - - 2013
Chronic rhinosinusitis (CRS) is a disease related to the nose and the paranasal sinus as defined by the European Position Paper on Rhinosinusitis and Nasal Polyps (EPOS) criteria. The criteria include subjective symptoms, such as nasal obstruction, and objective findings by endoscopy. Acoustic rhinometry (AR) is an objective method to ...
Mutturi Sarma - - 2013
A kinetic model fitted to enzymatic hydrolysis of Arundo donax was coupled to a fermentation kinetic model derived from simultaneous saccharification and fermentation (SSF) experiments at different temperatures for the determination of optimal temperature profile (between 36-45 (°) C) using iterative dynamic programming (IDP). A sensitivity analysis of enzyme kinetic ...
Iwata Michio - - 2013
Metabolic reaction systems can be modeled easily in terms of S-system type equations if their metabolic maps are available. This study therefore proposes a method for estimating parameters in decoupled S-system equations on the basis of the Newton-Raphson method and elucidates the performance of this estimation method. Parameter estimation from ...
Vargas A - - 2013
The coincidence summing correction factors estimated with penEasy, a steering program for the Monte Carlo simulation code PENELOPE, and with penEasy-eXtended, an in-house modified version of penEasy, are presented and discussed for (152)Eu and (134)Cs in volume sources. The geometries and experimental data were obtained from an intercomparison study organized ...
Al Shayeb K N KN Institute of Dentistry, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, New Road, London E1 2BA, United - - 2014
The purpose of the present in vitro study was to measure the accuracy and reproducibility of three periodontal probes. To eliminate environment- or examiner-related probing errors, two aluminum blocks with predrilled holes of varying depths were examined by participants who had been trained in probing before the study. This methodology ...
Sen Jaydip J Dept. of Anthropology, University of North Bengal, P.O. N.B.U., Darjeeling, West Bengal 734 013, India. Electronic address: - - 2014
Forensic anthropology involves identification of human remains in a legal situation. Along with the other three parameters of forensic anthropology, i.e., age, sex and ethnicity, stature estimation is an essential element of medico-legal investigations when identifications of unknown dismembered remains are involved. The present study was conducted with an aim ...
Balderson Michael John - - 2013
Abstract Purpose: This work investigates the potential implications on tumour control probability (TCP) for external beam prostate cancer treatment when considering the bystander effect in partial exposure scenarios. Materials and methods: The biological response of a prostate cancer target volume under conditions where a sub-volume of the target volume was ...
Rutkove Seward B - - 2013
Introduction: Electrical impedance myography (EIM) can be used to assess amyotrophic lateral sclerosis (ALS) progression. The relationship between EIM values and standard assessment measures, however, is unknown. Methods: EIM 50 kHz phase data from 60 subjects who participated in a longitudinal natural history study of ALS were correlated to handheld ...
Rodríguez Del Águila Mm - - 2013
When designing any research project, definition is required of the sample size needed in order to carry out the study. This sample size is an estimate of the number of patients required in accordance with the pursued study objective. In this context, it is more efficient in terms of both ...
Reynolds Steven S Academic Unit of Radiology, University of Sheffield, Sheffield S10 2JF, United Kingdom. Electronic address: - - 2013
Over recent years hyperpolarization by dissolution dynamic nuclear polarization has become an established technique for studying metabolism in vivo in animal models. Temporal signal plots obtained from the injected metabolite and daughter products, e.g. pyruvate and lactate, can be fitted to compartmental models to estimate kinetic rate constants. Modeling and ...
Price Charles A - - 2013
Leaf vein density (LVD) has garnered considerable attention of late with numerous studies linking it to the physiology, ecology and evolution of land plants. Despite this increased attention, little consideration has been given to the effects of measurement methods on estimation of LVD. Here we focus on the relationship between ...
Lagersted-Olsen J - - 2013
Until recently, methods for objective quantification of sitting time have been lacking. The aim of this study was to validate self-reported measures against objectively measured total sitting time and longest continuous time with uninterrupted sitting during working hours, leisure time on workdays and leisuredays. Objective diurnal measurement of sitting time ...
Pham M K - - 2013
A Certified Reference Material (CRM) for radionuclides in seaweed (Fucus vesiculosus) from the Baltic Sea (IAEA-446) is described and the results of the certification process are presented. The (40)K, (137)Cs, (234)U and (239+240)Pu radionuclides were certified for this material, and information values for 12 other radionuclides ((90)Sr, (99)Tc, (210)Pb ((210)Po), ...
Blum Kfir - - 2013
We show that the recent AMS-02 positron fraction measurement is consistent with a secondary origin for positrons and does not require additional primary sources such as pulsars or dark matter. The measured positron fraction at high energy saturates the previously predicted upper bound for secondary production, obtained by neglecting radiative ...
Wang Tan - - 2013
The remounting accuracy of optical components between measurement and polishing affects the polishing results, especially for small polishing footprint processes such as magnetorheological jet polishing (MJP). In this paper, two important remounting errors (translation and rotation errors) are discussed, and a masking method is proposed to correct these errors. A ...
Díaz Iván - - 2013
Abstract In this article, we present a sensitivity analysis for drawing inferences about parameters that are not estimable from observed data without additional assumptions. We present the methodology using two different examples: a causal parameter that is not identifiable due to violations of the randomization assumption, and a parameter that ...
Bojmehrani Azadeh - - 2013
Protective ventilation implementation requires the calculation of predicted body weight, determined by a formula based on gender and patient height. Consequently, height inaccuracy may be a limiting factor to correctly set tidal volumes. The objective of this study was to evaluate the accuracy of different methods in measuring heights in ...
Gupta Abhay - - 2013
Abstract Chewing difficulty index, a potential measure of difficulty in chewing the chewable tablets, has been described herein as the product of tablet thickness and tablet hardness measured under the diametral loading. The proposed index was evaluated by measuring the dimensions and mechanical strength of commercial and in-house prepared chewable ...
Seifi Mozhdeh - - 2013
Digital in-line holography was used to study a fast dynamic 3D phenomenon: the evaporation of free-falling diethyl ether droplets. We describe an unsupervised reconstruction algorithm based on an "inverse problems" approach previously developed by our team to accurately reconstruct 3D trajectories and to estimate the droplets' size in a field ...
Akçay Hakki Türker - - 2013
In this paper, computational studies were carried out on anastrozole and letrozole, chemotherapy drugs used against breast cancer. Optimization and frequency calculations were performed at B3LYP/6-31G (d) basis set and vibrational frequencies were assignment. Single point calculations were performed at DFT method with a hybrid functional B3LYP/6-311G (d, p) basis ...
Morris R - - 2013
We conducted a randomised, blinded study to compare the accuracy and perceived usability of two smartphone apps (uBurn(©) and MerseyBurns(©)) and a general purpose electronic calculator for calculating fluid requirements using the Parkland formula. Bespoke software randomly generated simulated clinical data; randomly allocated the sequence of calculation methods; recorded participants' ...
UhrovĨík Jozef J Department of Ecochemistry and Radioecology, University of SS. Cyril and Methodius in Trnava, Nám. J. Herdu 2, SK-917 01 Trnava, Slovak Republic. Electronic address: - - 2014
The paper is devoted to the evaluation of limit of detection (LOD) and limit of quantification (LOQ) values in concentration domain by using 4 different approaches; namely 3σ and 10σ approaches, ULA2 approach, PBA approach and MDL approach. Brief theoretical analyses of all above mentioned approaches are given together with ...
Smith G M - - 2013
Decisions on permitting, controlling and monitoring releases of radioactivity into the environment rely on a great variety of factors. Important among these is the prospective assessment of radionuclide behavior in the environment, including migration and accumulation among and within specific environmental media, and the resulting environmental and human health impacts. ...
Fernández-Delgado Manuel - - 2013
The Direct Kernel Perceptron (DKP) (Fernández-Delgado et al., 2010) is a very simple and fast kernel-based classifier, related to the Support Vector Machine (SVM) and to the Extreme Learning Machine (ELM) (Huang, Wang, & Lan, 2011), whose α-coefficients are calculated directly, without any iterative training, using an analytical closed-form expression which involves ...
Aguirre-Dugua Xitlali - - 2013
Selection criteria are important for analyzing domestication of perennial plant species, which experience a selection pressure throughout several human generations. We analyze the preferred morphological characteristics of Crescentia cujete fruits, which are used as bowls by the Maya of Yucatan, according to the uses they are given and the phenotypic ...
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