Search Results
Results 51 - 100 of 3186
1 2 3 4 5 6 7 8 9 10 >
Kerns James R - - 2014
The multileaf collimator (MLC) is a critical component to accurate intensity-modulated radiotherapy (IMRT) delivery. This study examined MLC positional accuracy via MLC logs from Varian machines from six institutions and three delivery techniques to evaluate typical positional accuracy and treatment and mechanical parameters that affect accuracy. Typical accuracy achieved was ...
Pavošević Fabijan F Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, - - 2014
We present a production implementation of reduced-scaling explicitly correlated (F12) coupled-cluster singles and doubles (CCSD) method based on pair-natural orbitals (PNOs). A key feature is the reformulation of the explicitly correlated terms using geminal-spanning orbitals that greatly reduce the truncation errors of the F12 contribution. For the standard S66 benchmark ...
Jeurissen Ben B iMinds - Vision Lab, Dept. of Physics, University of Antwerp, Belgium; The Florey Institute of Neuroscience and Mental Health, Melbourne, Australia. Electronic address: - - 2014
Constrained spherical deconvolution (CSD) has become one of the most widely used methods to extract white matter (WM) fibre orientation information from diffusion-weighted MRI (DW-MRI) data, overcoming the crossing fibre limitations inherent in the diffusion tensor model. It is routinely used to obtain high quality fibre orientation distribution function (fODF) ...
Ross David E DE Virginia Institute of Neuropsychiatry, Midlothian, VA; Virginia Commonwealth University, Richmond, VA. Electronic address: - - 2014
A recent meta-analysis by Hedman et al. allows for accurate estimation of brain volume changes throughout the life span. Additionally, Tate et al. showed that intracranial volume at a later point in life can be used to estimate reliably brain volume at an earlier point in life. These advancements were ...
Meija Juris - - 2014
Uncertainty of the result from the standard addition method is often underestimated due to neglect of the covariance between the intercept and the slope. In order to simplify the data analysis from standard addition experiments, we propose x-y coordinate swapping in conventional linear regression. Unlike the ratio of the intercept ...
Mansour Joseph M JM Department of Mechanical & Aerospace Engineering, Case Western Reserve University, 2123 Martin Luther King Jr. Drive, Glennan Building Room 616A, Cleveland, OH, 44106, USA, - - 2014
Our ultimate goal is to non-destructively evaluate mechanical properties of tissue-engineered (TE) cartilage using ultrasound (US). We used agarose gels as surrogates for TE cartilage. Previously, we showed that mechanical properties measured using conventional methods were related to those measured using US, which suggested a way to non-destructively predict mechanical ...
Seidi Foad F Department of Health and Sport Medicine, University of Tehran, Tehran, - - 2014
The amount of postural sway and sagittal deviation of lumbar lordosis angle in measurements of standing lumbar curvature obtained by flexible curve can be decreased when using a spine stabilizer instrument. However, this assumption has not been investigated so far. This study aims to determine the effect of using a ...
Aravkin Aleksandr Y - - 2014
Reconstruction of a function from noisy data is key in machine learning and is often formulated as a regularized optimization problem over an infinite-dimensional reproducing kernel Hilbert space (RKHS). The solution suitably balances adherence to the observed data and the corresponding RKHS norm. When the data fit is measured using ...
Qiu Yue Y 1] State Key Laboratory of Natural and Biomimetic Drugs (Peking University), Beijing 100191, China [2] Department of Pharmaceutics, School of Pharmaceutical Sciences, Peking University Health Science Center, Beijing 100191, - - 2014
Aim:Biomarkers and image markers of Alzheimer's disease (AD), such as cerebrospinal fluid Aβ42 and p-tau, are effective predictors of cognitive decline or dementia. The aim of this study was to integrate these markers with a disease progression model and to identify their abnormal ranges.Methods:The data of 395 participants, including 86 ...
Zhao Zhibiao Z Department of Statistics, Penn State University, University Park, PA - - 2014
We investigate asymptotic properties of least-absolute-deviation or median quantile estimates of the location and scale functions in nonparametric regression models with dependent data from multiple subjects. Under a general dependence structure that allows for longitudinal data and some spatially correlated data, we establish uniform Bahadur representations for the proposed median ...
Sokolova Alexandra B AB *Southern Urals Biophysics Institute (SUBI), Ozyorsk, Chelyabinsk Region, Russia; †Radiobiology Division, School of Medicine, University of Utah, Salt Lake City, - - 2014
Comparisons between results of in vivo counting measurements of americium burden and results from radiochemical analyses of organ samples taken at autopsy of 11 cases of former Mayak workers were made. The in vivo counting measurements were performed 3-8 y before death. The best agreement between in vivo counting measurements ...
Bian Wei - - 2014
In this brief, we show that minimizing nearest neighbor classification error (MNNE) is a favorable criterion for supervised linear dimension reduction (SLDR). We prove that MNNE is better than maximizing mutual information in the sense of being a proxy of the Bayes optimal criterion. Based on kernel density estimation, we ...
Bonett Douglas D University of - - 2014
Bonett and Wright (2011) proposed a simple and accurate sample size planning formula for estimating a squared multiple correlation with desired relative precision. Shieh (2013) incorrectly evaluated the accuracy of the Bonett-Wright formula. To address a criticism of Shieh that the Bonett-Wright formula was not examined under a wider range ...
Ballhausen Hendrik H Department of Radiotherapy and Radiation Oncology, University Hospital of the Ludwig-Maximilians-University, Marchioninistraße 15, 81377 Munich, - - 2014
To identify the relevant technical sources of error of a system based on three-dimensional ultrasound (3D US) for patient positioning in external beam radiotherapy. To quantify these sources of error in a controlled laboratory setting. To estimate the resulting end-to-end geometric precision of the intramodality protocol. Two identical free-hand 3D ...
Prathosh A P AP Department of Electrical Engineering, Indian Institute of Science, Bangalore 560012, India prathoshap@ee.iisc.ernet.in, - - 2014
This paper proposes an automatic acoustic-phonetic method for estimating voice-onset time of stops. This method requires neither transcription of the utterance nor training of a classifier. It makes use of the plosion index for the automatic detection of burst onsets of stops. Having detected the burst onset, the onset of ...
Tang Yi - - 2014
A novel framework of learning-based super-resolution is proposed by employing the process of learning from the estimation errors. The estimation errors generated by different learning-based super-resolution algorithms are statistically shown to be sparse and uncertain. The sparsity of the estimation errors means most of estimation errors are small enough. The ...
Martinez Edson Z EZ Department of Social Medicine, University of São Paulo (USP), Ribeirão Preto School of Medicine, Brazil. Electronic address: - - 2014
The cure fraction models have been widely used to analyze survival data in which a proportion of the individuals is not susceptible to the event of interest. In this article, we introduce a bivariate model for survival data with a cure fraction based on the three-parameter generalized Lindley distribution. The ...
Kuyoc-Carrillo Vicente F VF Centro de Investigación Farmacológica y Biotecnológica, Médica Sur, Mexico City, 14050, - - 2014
Preclinical Research The increasing awareness that drugs may have the clinical effect through the interaction with multiple targets is encouraging the screening of investigational compounds across multiple biological endpoints. As the number and complexity of chemogenomics data sets increase, more computational approaches are being developed for the efficient analysis of ...
Kotłowska Alicja A Department of Food Sciences, Faculty of Pharmacy, Medical University of Gdańsk, Gdańsk, 80-416, - - 2014
Preclinical Research Metabolomics deals with the global assessment of the metabolites present in a biological system to evaluate the progress of the disease, select potential biomarkers, and provide insights into the underlying pathophysiology. As metabolomic analysis generates large quantities of data, multivariate data analysis techniques and chemometrics are often used ...
Acuna Daniel E DE Rehabilitation Institute of Chicago - - 2014
Sequence production tasks are a standard tool to analyze motor learning, consolidation, and habituation. As sequences are learned, movements are typically grouped into subsets or chunks. For example, most Americans memorize telephone numbers in two chunks of 3 digits, and one chunk of 4. Studies generally use response times or ...
Ilahi Omer A OA Texas Arthroscopy & Sports Medicine Institute, Houston, Texas, U.S.A.. Electronic address: - - 2014
To assess interobserver and intraobserver agreement of estimating anterior cruciate ligament (ACL) femoral tunnel positioning arthroscopically using circular and linear (noncircular) estimation methods and to determine whether overlay template visual aids improve agreement. Standardized intraoperative pictures of femoral tunnel pilot holes (taken with a 30° arthroscope through an anterolateral portal ...
Marasco Daniel Eric - - 2014
Quantifying green roof evapotranspiration (ET) in urban climates is important for assessing environmental benefits, including stormwater runoff attenuation and urban heat island mitigation. In this study, a dynamic chamber method was developed to quantify ET on two extensive green roofs located in New York City, NY. Hourly chamber measurements taken ...
Jancey Jonine - - 2014
The workplace is a setting where sedentary behaviour is highly prevalent. Accurately measuring physical activity and sedentary behaviour is crucial to assess the impact of behavioural change interventions. This study aimed to evaluate the reliability and criterion validity of the Occupational Sitting and Physical Activity Questionnaire (OSPAQ) and compare with ...
González-Jorge Higinio H Department of Natural Resources and Environmental Engineering, School of Mining Engineering, University of Vigo, 36310 Vigo, - - 2014
Kinect sensor appears as a low-cost option for 3D modeling. This manuscript describes a methodology to test the applicability of Kinect to crime scenes. The methodology includes the comparison versus well-established scanners (Faro and Trimble). The parameters used for the comparison are the quality in the fitting of primitives, a ...
Kooshkbaghi Mahdi M Aerothermochemistry and Combustion Systems Laboratory, Swiss Federal Institute of Technology, Zurich CH-8092, - - 2014
An algorithm based on the Relaxation Redistribution Method (RRM) is proposed for constructing the Slow Invariant Manifold (SIM) of a chosen dimension to cover a large fraction of the admissible composition space that includes the equilibrium and initial states. The manifold boundaries are determined with the help of the Rate ...
Arellano-García Luis L Departamento de Ingeniería de Procesos e Hidráulica, UAM Iztapalapa, San Rafael Atlixco 186, Col. Vicentina, Iztapalapa, Mexico City, 09340, - - 2014
Excess biomass buildup in biotrickling filters leads to low performance. The effect of biomass accumulation in a biotrickling filter (BTF) packed with polyurethane foam (PUF) was assessed in terms of hydrodynamics and void space availability in a system treating dimethyl disulfide (DMDS) vapors with an alkaliphilic consortium. A sample of ...
Caricchi Luca L Section of Earth and Environmental Sciences, University of Geneva, rue des Maraîchers 13, CH-1205 Geneva, - - 2014
Magma fluxes regulate the planetary thermal budget, the growth of continents and the frequency and magnitude of volcanic eruptions, and play a part in the genesis and size of magmatic ore deposits. However, because a large fraction of the magma produced on the Earth does not erupt at the surface, ...
Garrido-Varas Claudia C School of Science and Engineering, Teesside University, Borough Road, Middlesbrough, TS1 3BA, - - 2014
Matching pairs of skeletal elements is of fundamental importance when re-associating skeletons from commingled settings. This study presents a new method that combines the use of traditional anthropometric size measurements and the analysis of shape, through geometric morphometrics, to form pairs from commingled settings. We tested the hypothesis that shape ...
Burns Angus A Department of Public and Child Dental - - 2014
To investigate the inter-examiner variability of contact point displacement measurements (used to calculate the overall Little's Irregularity Index (LII) score) from digital models of the maxillary arch by four independent examiners. Maxillary orthodontic pre-treatment study models of ten patients were scanned using the LavaTM Chairside Oral Scanner (LCOS) and 3D ...
Yettou L L Faculty of Physics, USTHB BP 32 El Alia, 16111 Bab-Ezzouar, Algiers, Algeria. Electronic address: - - 2014
A new semi-empirical formula for the calculation of the (n, He-3) cross section at 14.6MeV neutron energy is obtained. It is based on the evaporation model. The new formula with three parameters is found to give a better fit to the data than the previous comparable formulae.
Koes David Ryan DR Department of Computational and Systems Biology, University of Pittsburgh, Pittsburgh, - - 2014
Shape-based virtual screening is an established and effective method for identifying small molecules that are similar in shape and function to a reference ligand. We describe a new method of shape-based virtual screening, volumetric aligned molecular shapes (VAMS). VAMS uses efficient data structures to encode and search molecular shapes. We ...
Polidori David - - 2014
The indocyanine green dilution method is one of the methods available to estimate plasma volume, although some researchers have questioned the accuracy of this method. We developed a new, physiologically based mathematical model of indocyanine green kinetics that more accurately represents indocyanine green kinetics during the first few minutes postinjection ...
Kallehauge Jesper Folsted JF Department of Medical Physics, Aarhus University Hospital , Aarhus , - - 2014
Background. Dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) offers a unique capability to probe tumour microvasculature. Different analysis of the acquired data will possibly lead to different conclusions. Therefore, the objective of this study was to investigate under which conditions the Tofts (TM), extended Tofts (ETM), compartmental tissue uptake model (C-TU) ...
White Thomas A TA Center for Free-Electron Laser Science, Deutches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany - - 2014
A post-refinement procedure has been devised for 'snapshot' diffraction data consisting entirely of partially recorded reflections, each diffraction pattern from a crystal in an orientation unrelated to the others. Initial estimates of the diffraction geometry are used to calculate initial partialities, which are then used to scale the entire dataset ...
Yang Su S Orthodontic Resident, Department of Orthodontics, Peking University School and Hospital of Stomatology, No. 22 ZhongGuanCun Nandajie, HaiDian District, Beijing 100081, People's Republic of - - 2014
Objectives: The purposes of the study are to investigate the consistency of linear measurements between CBCT orthogonally synthesized cephalograms and conventional cephalograms and evaluate the influence of different magnifications on these comparisons based on a simulation algorithm. Materials and Methods: Conventional cephalograms and CBCT scans were taken on twelve dry ...
Liu Raymond W RW Department of Orthopaedic Surgery, Rainbow Babies and Children's Hospital, 11100 Euclid Avenue, RBC 6081, Cleveland, OH 44106. E-mail address: - - 2014
Based on the complexity of proximal femoral geometry, osteotomies in the coronal plane may change femoral version, while osteotomies in the plane of the femoral neck should not. Theoretically, this relationship can lead to a systematic error when measuring rotational correction in the proximal part of the femur.METHODS: We developed ...
Huang Yi-Hsuan YH Department of Anesthesiology, Tri-Service General Hospital and National Defense Medical Center, Taipei, Taiwan, - - 2014
Proper size selection is crucial to the effective use of a laryngeal mask airway (LMA). The current choice of LMA size is based on body weight; in addition, the sex-based selection has also been suggested. However, the relationship between body weight, sex, and the dimension of hypopharynx where the LMA ...
Badii Maziar M From the Division of Rheumatology, Department of Medicine, and the Department of Radiology, and the Department of Health Care and Epidemiology, University of British Columbia (UBC); Pacific Arthritis Center, Vancouver, British Columbia, Canada. M. Badii, MD, MHSc, Division of Rheumatology, Department of Medicine, UBC; A.N. Wade, BSc Candidate, Research Associate, Pacific Arthritis Center; D.R. Collins, MD, Division of Rheumatology, Department of Medicine, UBC; S. Nicolaou, Department of Radiology, UBC; B.J. Kobza, MPT, Physiotherapy, Pacific Arthritis Center; J.A. Kopec, MD, PhD, Department of Health Care and Epidemiology, UBC. Address correspondence to A.N. Wade, 3216 Puget Drive, Vancouver, British Columbia V6L 2T5, Canada. E-mail: a.nicolewade@gmail.com. Accepted for publication April 4, - - 2014
To evaluate the validity (accuracy) and reliability of 2 commonly used clinical methods, 1 indirect (lifts) and 1 direct (tape measure), for assessment of leg length discrepancy (LLD) in comparison to radiograph. Twenty subjects suspected of having LLD participated in this study. Two clinical methods, 1 direct using a tape ...
Kaplan Robert M RM Office of Behavioral and Social Sciences Research and Department of Rehabilitation Medicine, National Institutes of Health, Bethesda, Maryland, - - 2014
A number of commentaries have suggested that large studies are more reliable than smaller studies and there is a growing interest in the analysis of "big data" that integrates information from many thousands of persons and/or different data sources. We consider a variety of biases that are likely in the ...
Xu Guangjian G College of Marine Life Science, Ocean University of China, Qingdao, 266003, - - 2014
The functional parameters, i.e., the estimated equilibrium species number (S eq ), the colonization rate constant, and the time taken to reach 90 % of S eq (T 90 ), of microperiphyton fauna have been widely used to determine the water quality status in aquatic ecosystems. The objective of this investigation ...
Crawley Jennifer Kluth JK University of Houston, Psychology, Houston, Texas, United States ; - - 2014
Although there are many studies of people with complete or partial hypogenesis of the corpus callosum (CC), little is understood about the hypoplastic CC in which all structures are present but thinned. Spina bifida myelomeningocele (SBM) is a model organism for such studies because many have either a hypogenetic or ...
Breivik Knut K Norwegian Institute for Air Research, Box 100, NO-2027 Kjeller, - - 2014
The transport of discarded electronic and electrical appliances (e-waste) to developing regions has received considerable attention, but it is difficult to assess the significance of this issue without a quantitative understanding of the amounts involved. The main objective of this study is to track the global transport of e-wastes by ...
Kozicki Marek M GeVero Co., Tansmana St. 2/11, 92-548 Lodz, - - 2014
The subject of this work is polyGeVero(®) software (GeVero Co., Poland), which has been developed to fill the requirements of fast calculations of 3D dosimetry data with the emphasis on polymer gel dosimetry for radiotherapy. This software comprises four workspaces that have been prepared for: (i) calculating calibration curves and ...
Emura Takeshi T Graduate Institute of Statistics, National Central University, Zhongli, Taiwan, - - 2014
Doubly truncated data consist of samples whose observed values fall between the right- and left- truncation limits. With such samples, the distribution function of interest is estimated using the nonparametric maximum likelihood estimator (NPMLE) that is obtained through a self-consistency algorithm. Owing to the complicated asymptotic distribution of the NPMLE, ...
Waterman Kenneth C KC FreeThink Technologies, Inc, East Lyme, - - 2014
Three competing mathematical fitting models (a point-by-point estimation method, a linear fit method, and an isoconversion method) of chemical stability (related substance growth) when using high temperature data to predict room temperature shelf-life were employed in a detailed comparison. In each case, complex degradant formation behavior was analyzed by both ...
Fang Bin B College of Computer Science, Chongqing University, Chongqing 400044, PR China. Electronic address: - - 2014
Shape-based 3D surface reconstructing methods for liver vessels have difficulties to tackle with limited contrast of medical images and the intrinsic complexity of multi-furcation parts. In this paper, we propose an effective and robust technique, called Gap Border Pairing (GBPa), to reconstruct surface of liver vessels with complicated multi-furcations. The ...
Ebert M A MA Department of Radiation Oncology, Sir Charles Gairdner Hospital, Western Australia, Australia. School of Physics, University of Western Australia, Western Australia, - - 2014
Dose constraints based on histograms provide a convenient and widely-used method for informing and guiding radiotherapy treatment planning. Methods of derivation of such constraints are often poorly described. Two non-parametric methods for derivation of constraints are described and investigated in the context of determination of dose-specific cut-points-values of the free ...
Berryman F F Research & Teaching Centre, Royal Orthopaedic Hospital, Birmingham, - - 2014
The measurement of femoral version is important in surgical planning of derotational osteotomies particularly for patients with proximal femoral deformity. It is, however, difficult to measure version accurately and differences of 10° to 15° have been found between repeated measurements. The aim of this work was first to develop a ...
Stoklosa Jakub J School of Mathematics and Statistics, The University of New South Wales, New South Wales 2052, Australia. Electronic address: - - 2014
To accommodate seasonal effects that change from year to year into models for the size of an open population we consider a time-varying coefficient model. We fit this model to a capture-recapture data set collected on the little penguin Eudyptula minor in south-eastern Australia over a 25 year period using ...
Kaminsky David A DA Vermont Lung Center, Pulmonary Disease and Critical Care Medicine, University of Vermont College of Medicine, Burlington, Vermont, - - 2014
Ventilation heterogeneity (VH) has been linked to airway responsiveness (AR) based on various measures of VH involving inert gas washout, forced oscillation and lung imaging. We explore whether VH at baseline, as measured by the simple ratio of single breath alveolar volume to plethysmographically determined total lung capacity (VA/TLC), would ...
1 2 3 4 5 6 7 8 9 10 >