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Results 201 - 250 of 5793
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Lin Shu S State Key Laboratory of Industrial Control Technology, Zhejiang University, Hangzhou 310027, Zhejiang, China. Electronic address: - - 2014
This paper discusses active surge control in variable speed axial compressors. A compression system equipped with a variable area throttle is investigated. Based on a given compressor model, a fuzzy logic controller is designed for surge control and a proportional speed controller is used for speed control. The fuzzy controller ...
Wang Handing H Key Lab of Intelligent Perception and Image Understanding of Ministry of Education, International Center of Intelligent Perception and Computation, Xidian University, Xi'an, 710071, China. - - 2014
Abstract There can be a complicated mapping relation between decision variables and objective functions in multi-objective optimization problems (MOPs). It is uncommon that decision variables influence objective functions equally. Decision variables act differently in different objective functions. Hence, often, the mapping relation is unbalanced, which causes some redundancy during the ...
Perales Francisco F Institute for Social Science Research, School of Social Science, The University of Queensland, Brisbane, - - 2014
The purpose of this study is to provide a comprehensive analysis of the associations between the frequency of moderate or vigorous physical activity (MVPA) and quality of life (QoL) measures using longitudinal data and panel regression models on a large, representative sample of the Australian population. This study used yearly ...
Cook Douglas D New York University, Abu Dhabi, United Arab Emirates. Electronic address: - - 2014
Biological systems are characterized by high levels of variability, which can affect the results of biomechanical analyses. As a review of this topic, we first surveyed levels of variation in materials relevant to biomechanics, and compared these values to standard engineered materials. As expected, we found significantly higher levels of ...
Muehlethaler Cyril C Ecole des Sciences Criminelles, Institut de Police Scientifique, Université de Lausanne, 1015 Lausanne-Dorigny, Switzerland. Electronic address: - - 2014
In order to decide if replicated measurements of a trace fall within the intra-variability expected for reference paint samples, a forensic scientist has to understand and integrate all reasonable sources of variation. The origins of such variation in spectra can be various, but mainly include differences in components distribution (homogeneity ...
Chiu Weihsueh A WA National Center for Environmental Assessment, Office of Research and Development, U.S. Environmental Protection Agency, Washington, DC, - - 2014
Quantitative estimation of toxicokinetic variability in the human population is a persistent challenge in risk assessment of environmental chemicals. Traditionally, inter-individual differences in the population are accounted for by default assumptions or, in rare cases, are based on human toxicokinetic data. To evaluate the utility of genetically diverse mouse strains ...
Liu Siwei S Human Development and Family Studies, Department of Human Ecology, University of California, Davis, Davis, CA, 95616, USA, - - 2014
This article introduces iVAR, an R program for imputing missing data in multivariate time series on the basis of vector autoregressive (VAR) models. We conducted a simulation study to compare iVAR with three methods for handling missing data: listwise deletion, imputation with sample means and variances, and multiple imputation ignoring ...
Cao Hongbao H Unit on Statistical Genomics, Intramural Program of Research, National Institute of Mental Health, NIH, Bethesda, 20852, - - 2014
Integrative analysis of multiple data types can take advantage of their complementary information and therefore may provide higher power to identify potential biomarkers that would be missed using individual data analysis. Due to different nature of diverse data modality, data integration is challenging. Here we address the data integration problem ...
Hamacher Daniel D Department of Sport Science, Otto von Guericke University Magdeburg, Brandenburger Str. 9, Magdeburg 39104, Germany. Electronic address: - - 2014
While camera-based motion tracking systems are considered to be the gold standard for kinematic analysis, these systems are not practical in clinical practice. However, the collection of gait parameters using inertial sensors is feasible in clinical settings and less expensive, but suffers from drift error that excludes accurate analyses. The ...
Boix-Montañes Antonio A Departamento de Farmacia y Tecnologia Farmacéutica, Facultad de Farmacia, Universidad de Barcelona , Barcelona , Spain - - 2014
Abstract Context: Teicoplanin is a fermentative antibiotic consisting of several active components that contribute similarly to the antibacterial activity, but exhibit different pharmacokinetic properties. Differences in systemic exposure between batches of teicoplanin are possible within pharmacopeial specifications as the proportion of subcomponents may vary from batch to batch. Objective: The ...
Navarro Pedro P Centro de Biología Molecular Severo Ochoa, CSIC-UAM , 28049 Madrid, - - 2014
The combination of stable isotope labeling (SIL) with mass spectrometry (MS) allows comparison of the abundance of thousands of proteins in complex mixtures. However, interpretation of the large data sets generated by these techniques remains a challenge because appropriate statistical standards are lacking. Here, we present a generally applicable model ...
Yang Bao B Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, - - 2014
An annually resolved and absolutely dated ring-width chronology spanning 4,500 y has been constructed using subfossil, archaeological, and living-tree juniper samples from the northeastern Tibetan Plateau. The chronology represents changing mean annual precipitation and is most reliable after 1500 B.C. Reconstructed precipitation for this period displays a trend toward more ...
Mansouri Majdi M MM Electrical and Computer Engineering Program, Texas A&M University at Qatar, Doha, Qatar. Electronic address: - - 2014
A central challenge in computational modeling of biological systems is the determination of the model parameters. In such cases, estimating these variables or parameters from other easily obtained measurements can be extremely useful. For example, time-series dynamic genomic data can be used to develop models representing dynamic genetic regulatory networks, ...
Fonseca F F Instituto Nacional de Pesquisas Espaciais/INPE, Av. dos Astronautas, 1758 Jd. Granja, CEP 12227-010, São José dos Campos, SP, Brasil. Electronic address: - - 2014
Schistosomiasis is a transmissible parasitic disease caused by the etiologic agent Schistosoma mansoni, whose intermediate hosts are snails of the genus Biomphalaria. The main goal of this paper is to estimate the prevalence of schistosomiasis in Minas Gerais state in Brazil using spatial disease information derived from the state transportation ...
Silvestro Daniele D Department of Ecology and Evolution, University of Lausanne, 1015 Lausanne, - - 2014
The temporal dynamics of species diversity are shaped by variations in the rates of speciation and extinction, and there is a long history of inferring these rates using first and last appearances of taxa in the fossil record. Understanding diversity dynamics critically depends on unbiased estimates of the unobserved times ...
Liang Ying - - 2014
Life satisfaction research in China is in development, requiring new perspectives for enrichment. In China, occupational mobility is accompanied by changes in economic liberalization and the emergence of occupational stratification. On the whole, however, occupational mobility has rarely been used as an independent variable. Health status is always used as ...
Peeters Elisabeth E Laboratory of Pharmaceutical Technology, Ghent University , Ghent , Belgium - - 2014
Abstract Context: Tableting is a complex process due to the large number of process parameters that can be varied. Knowledge and understanding of the influence of these parameters on the final product quality is of great importance for the industry, allowing economic efficiency and parametric release. Objective: The aim of ...
Cooper D M DM CEH Bangor, Environment Centre Wales, Deiniol Road, Bangor, LL57 2UW, UK. - - 2014
We use a simple multiplicative spatio-temporal model to describe variability in a sequence of water quality monitoring data from headwater streams in the Conwy catchment, North Wales. The spatial component of the model treats concentrations as due to simple mixing of a small number of distinct source types, each associated ...
Islam Md Kafiul MK Department of Electrical and Computer Engineering, NationalUniversity of Singapore, - - 2014
In-Vivo neural recordings are often corrupted by different artifacts, especially in a less-constrained recording environment. Due to limited understanding of the artifacts appeared in the in-vivo neural data, it is more challenging to identify artifacts from neural signal components compared with other applications. The objective of this work is to ...
James G Andrew GA Psychiatric Research Institute, University of Arkansas for Medical Sciences, Little Rock, Arkansas. Electronic address: - - 2014
Independent component analysis (ICA) is a data-driven approach frequently used in neuroimaging to model functional brain networks. Despite ICA's increasing popularity, methods for replicating published ICA components across independent datasets have been underemphasized. Traditionally, the task-dependent activation of a component is evaluated by first back-projecting the component to a functional ...
Bishop William W Department of Machine Learning, Carnegie Mellon University, Pittsburgh, PA 15213, USA. Center for the Neural Basis of Cognition, Carnegie Mellon University, Pittsburgh, PA 15213, - - 2014
Objective. Intracortical brain-computer interface (BCI) decoders are typically retrained daily to maintain stable performance. Self-recalibrating decoders aim to remove the burden this may present in the clinic by training themselves autonomously during normal use but have only been developed for continuous control. Here we address the problem for discrete decoding ...
Riva Fabiano F School of Criminal Sciences, Institute of Forensic Science, University of Lausanne, Quartier Sorge, CH-1015, Lausanne, - - 2014
Recent years have been characterized by a series of publications in the field of firearms investigation questioning the reliability and objectivity of such examination. This research investigates new solutions to decrease the subjective component affecting the evaluation that follows the comparison of impressions left by a firearm on the surface ...
Abdel Fatah Emam E EE Department of Mechanical, Aerospace, and Biomedical Engineering, University of Tennessee, 301 Perkins Hall, Knoxville, TN; Institute of Biomedical Engineering, University of Tennessee, 1506 Middle Drive, 311 Perkins Hall, Knoxville, TN - - 2014
This study utilizes an innovative 3D approach to discover metric variables that obtain the highest classification rates for sex estimation from the cranium. Models were constructed from 222 cranial CT scans of U.S. Whites from the Bass Donated Collection. These models were used to create a statistical bone atlas that ...
Bonetti Jennifer J Forensic Science Program, Cedar Crest College, 100 College Drive, Allentown, PA, - - 2014
This study has shown that the combination of simple techniques with the use of multivariate statistics offers the potential for the comparative analysis of soil samples. Five samples were obtained from each of twelve state parks across New Jersey in both the summer and fall seasons. Each sample was examined ...
Chen Lei L Key Laboratory of Advanced Process Control for Light Industry (Ministry of Education), Institute of Automation, Jiangnan University, Wuxi 214122, PR China; Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Canada AB T6G 2G6. Electronic address: - - 2014
This paper investigates the parameter estimation problem of the dual-rate system with time delay. The slow-rate model of the dual-rate system with time delay is derived by using the discretization technique. The parameters and states of the system are simultaneously estimated. The states are estimated by using the Kalman filter, ...
Hosseini Seiyed Mossa SM Natural Geography Department, University of Tehran, Tehran, 14155-6465, Iran, - - 2014
The aim of this study is to develop a fuzzy neural network-based support vector regression model (FNN-SVR) for mapping crisp-input and fuzzy-output variables. In this model, an artificial neural network (ANN) estimator based on multilayer perceptron (MLP) is considered as the kernel function of the SVR, whereas asymmetric triangular fuzzy ...
Soane Emma E London School of Economics and Political Science, London, United Kingdom. Electronic address: - - 2014
To examine the associations between team working processes, error rates, delays and difficulties in resolving delays during vascular surgical procedures. To then make informed recommendations for future study in this area and future practice. Single centre observational pilot study. 12 procedures were observed over a three-week period by a trained ...
Keeley Nigel B NB Cawthron Institute, Nelson 7010, New Zealand; Tasmanian Aquaculture and Fisheries Institute, University of Tasmania, Taroona, Tasmania, Australia. Electronic address: - - 2014
This study documents eight years of benthic recovery at a highly impacted salmon farm. Substantial recovery occurred in the first 2years, and was assessed to be complete after ∼5years. However, minor differences were still evident, along with some on-going benthic instability, attributable to medium-scale spatial movements and successional patterns of ...
Bryan Matthew M Department of Biostatistics and Epidemiology, University of Pennsylvania, Philadelphia, PA 19104, - - 2014
Comparing rates of growth, or rates of change, across covariate-defined subgroups is a primary objective for many longitudinal studies. In the special case of a linear trend over time, the interaction between a covariate and time will characterize differences in longitudinal rates of change. However, in the presence of a ...
Regadas Filho J G L JG Departamento de Zootecnia, Universidade Federal de Viçosa, Viçosa, Minas Gerais 36570-000, - - 2014
The objectives of this study were to evaluate ruminal fiber stratification and to develop a mathematical approach for predicting the mean retention time (MRT) of forage and concentrates in goats. A dataset from three studies was used that contained information regarding fiber and lignin intake as well as ruminal content ...
Liu Ruifeng - - 2014
Using a benchmark Ames mutagenicity dataset, we evaluated the performance of molecular fingerprints as descriptors for developing quantitative structure-activity relationship (QSAR) models and defining applicability domains with two machine-learning methods: random forest (RF) and variable nearest neighbor (v-NN). The two methods focus on complementary aspects of chemical mutagenicity and use ...
Yung Yiu-Fai YF SAS Institute Inc., Cary, North Carolina, - - 2014
This paper demonstrates the usefulness and flexibility of the general structural equation modelling (SEM) approach to fitting direct covariance patterns or structures (as opposed to fitting implied covariance structures from functional relationships among variables). In particular, the MSTRUCT modelling language (or syntax) of the CALIS procedure (SAS/STAT version 9.22 or ...
Taghipour Javi Shahabeddin S Graduate Faculty of Environment, University of Tehran, P.O. Box, 14155-6135, Tehran, Iran, - - 2014
Understanding the spatiotemporal relationships between land use/cover changes (LUCC) and groundwater resources is necessary for effective and efficient land use management. In this paper, geographically weighted regression (GWR) and ordinary least squares (OLS) models have been expanded to analyze varying spatial relationships between groundwater quantity changes and LUCC for three ...
Buonocore Aniello - - 2014
A method to generate first passage times for a class of stochastic processes is proposed. It does not require construction of the trajectories as usually needed in simulation studies, but is based on an integral equation whose unknown quantity is the probability density function of the studied first passage times ...
Montoro Aldana M Gonzalez - - 2014
A new synchrony index for neural activity is defined in this paper. The method is able to measure synchrony dynamics in low firing rate scenarios. It is based on the computation of the time intervals between nearest spikes of two given spike trains. Generalized additive models are proposed for the ...
Koyama Shinsuke - - 2014
The question, how much information can be theoretically gained from variable neuronal firing rate with respect to constant average firing rate is investigated. We employ the statistical concept of information based on the Kullback-Leibler divergence, and assume rate-modulated renewal processes as a model of spike trains. We show that if ...
Kim Hideaki - - 2014
Because every spike of a neuron is determined by input signals, a train of spikes may contain information about the dynamics of unobserved neurons. A state-space method based on the leaky integrate-and-fire model, describing neuronal transformation from input signals to a spike train has been proposed for tracking input parameters ...
Liu Xianan X * Department of Environmental Health & Safety, Iowa State University, 2809 Daley Drive, Ames, IA 50010; † University Station Box 3944, University of Wyoming, Laramie, WY 82071; ‡ Department of Environmental, Radiological and Health Sciences, Colorado State University, Fort Collins, CO - - 2014
Few published data are available to describe the size distribution of aerosols within the uranium mining environment. Activity size distribution of the radon progeny attached aerosols was measured at the Schwartzwalder uranium mine (Jefferson County, Colorado, USA) using the diffusion battery method in the summer of 1970. The measurements from ...
Lin Y-T YT Department of Anesthesiology, Shin Kong Wu Ho-Su Memorial Hospital, Taipei, Taiwan; Graduate Institute of Biomedical Electronics and Bioinformatics, National Taiwan University, Taipei, - - 2014
Heart rate variability (HRV) may reflect various physiological dynamics. In particular, variation of R-R peak interval (RRI) of electrocardiography appears regularly oscillatory in deeper levels of anaesthesia and less regular in lighter levels of anaesthesia. We proposed a new index, non-rhythmic-to-rhythmic ratio (NRR), to quantify this feature and investigated its ...
Cecchini Estrada José A JA Universidad de - - 2014
Background: Despite the fact that there are a few instruments designed to measure dispositional and contextual variables in educational contexts, the goal of this study is to elaborate and validate two questionnaires to measure learning interest, effort and progression as dispositional (IEPA) and contextual (AYEs) variables in secondary education students. ...
Schulze H Georg HG Michael Smith Laboratories, The University of British Columbia, 2185 East Mall, Vancouver, BC, Canada, V6T - - 2014
Charge-coupled device detectors are vulnerable to cosmic rays that can contaminate Raman spectra with positive going spikes. Because spikes can adversely affect spectral processing and data analyses, they must be removed. Although both hardware-based and software-based spike removal methods exist, they typically require parameter and threshold specification dependent on well-considered ...
Eckhard Timo - - 2014
The performance of learning-based spectral estimation is greatly influenced by the set of training samples selected to create the reconstruction model. Training sample selection schemes can be categorized into global and local approaches. Most of the previously proposed global training schemes aim to reduce the number of training samples, or ...
Song G Hugh - - 2014
Based on complex-variable analysis of a Fabry-Perot resonator as a multimode nonsymmetric two-port waveguide device, two versions of equivalent-circuit configurations are presented: Starting from a renewed study on single-mode two-pole circuits, we develop two respective multimode equivalent circuits of an almost identical configuration: one for the reflection coefficient and the ...
Puig Ana A Counselor Education Program, University of - - 2014
Burnout is a common phenomenon among psychotherapists. The purpose of this study was to test the Counselor Burnout Inventory (CBI; Lee et al., 2007) measurement invariance, as well as compare means of five latent variables (i.e., CBI subscales of Exhaustion, Incompetence, Negative Work Environment, Devaluing Client, and Deterioration in Personal ...
Roesch Etienne B EB School of Systems Engineering, University of Reading, Reading RG6 6AH, United Kingdom. contact@etienneroes.ch f.t.stahl@reading.ac.uk http://etienneroes.ch - - 2014
We are sympathetic with Bentley et al.'s attempt to encompass the wisdom of crowds in a generative model, but posit that a successful attempt at using big data will include more sensitive measurements, more varied sources of information, and will also build from the indirect information available through technology, from ...
Garbino Alejandro A Department of Medicine, Section of Emergency Medicine and Center for Space Medicine, Baylor College of Medicine, Houston, TX, 77030-1402, - - 2014
The Red Bull Stratos Project consisted of incremental high altitude parachute jumps [maximum altitude 127,852 ft (38,969 m)] from a pressurized capsule suspended from a stratospheric helium-filled balloon. A physiological monitoring system was worn by the parachutist to provide operational medical and acceleration data and to record a unique set ...
van Schooten Kimberley S - - 2014
Stride-to-stride variability and local dynamic stability of gait kinematics are promising measures to identify individuals at increased risk of falling. This study aimed to explore the feasibility of using these metrics in clinical practice and ambulatory assessment, where only a small number of consecutive strides are available. The concurrent validity ...
Curado Maria Alice Santos MA Escola Superior de Enfermagem de Lisboa, Lisboa, Portugal, - - 2014
The sample dimension, types of variables, format used for measurement, and construction of instruments to collect valid and reliable data must be considered during the research process. In the social and health sciences, and more specifically in nursing, data-collection instruments are usually composed of latent variables or variables that cannot ...
Tinius Alexander A Department of Biological Sciences, University of Calgary, Calgary Alberta, - - 2014
The breast-shoulder apparatus (BSA) is a structurally and kinematically complex region of lizards. Compared with the pelvic region it has received little attention, even though its morphological variation is known to be extensive. This variability has seldom been the focus of functional explanation, possibly because the BSA has been difficult ...
Travo Adrian A University of Bordeaux, Pharmacochimie, FRE 3396, 33000, Bordeaux, - - 2014
It has been widely reported that the tear film, which is crucially important as a protective barrier of the eye, undergoes biochemical changes as a result of a wide range of ocular pathology. This tends to suggest the possibility of early detection of ocular diseases on the basis of biochemical ...
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