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Time series analysis

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https://www.readbyqxmd.com/read/27936157/correction-the-hog-cycle-of-law-professors-an-econometric-time-series-analysis-of-the-entry-level-job-market-in-legal-academia
#1
(no author information available yet)
[This corrects the article DOI: 10.1371/journal.pone.0159815.].
2016: PloS One
https://www.readbyqxmd.com/read/27935960/hydrological-regime-and-water-shortage-as-drivers-of-the-seasonal-incidence-of-diarrheal-diseases-in-a-tropical-montane-environment
#2
Laurie Boithias, Marc Choisy, Noy Souliyaseng, Marine Jourdren, Fabrice Quet, Yves Buisson, Chanthamousone Thammahacksa, Norbert Silvera, Keooudone Latsachack, Oloth Sengtaheuanghoung, Alain Pierret, Emma Rochelle-Newall, Sylvia Becerra, Olivier Ribolzi
BACKGROUND: The global burden of diarrhea is a leading cause of morbidity and mortality worldwide. In montane areas of South-East Asia such as northern Laos, recent changes in land use have induced increased runoff, soil erosion and in-stream suspended sediment loads, and potential pathogen dissemination. To our knowledge, few studies have related diarrhea incidences to catchment scale hydrological factors such as river discharge, and loads of suspended sediment and of Fecal Indicator Bacteria (FIB) such as Escherichia coli, together with sociological factors such as hygiene practices...
December 2016: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/27933227/extending-the-study-of-the-6-8-rearrangement-in-flavylium-compounds-to-higher-ph-values-interconversion-between-6-bromo-and-8-bromo-apigeninidin
#3
Luís M Cruz, Nuno M Basílio, Victor A de Freitas, João C Lima, Fernando J Pina
The rearrangement between isomers 6- and 8-bromo-apigeninidin (6 and 8) was studied by pH jumps using stopped flow, UV/Vis, NMR, and HPLC analysis. The system constitutes a pH-dependent network of chemical reactions involving up to 18 different species. The dynamic network is equivalent to a single diprotic acid exhibiting two pKas, 2.55 and 5.4. Similar to other flavylium derivatives, the mole fraction of the species hemiketal and cis-chalcone in both multistate isomers are negligible at the equilibrium...
June 2016: ChemistryOpen
https://www.readbyqxmd.com/read/27933032/bifurcation-type-and-larger-low-shear-area-are-associated-with-rupture-status-of-very-small-intracranial-aneurysms
#4
Yisen Zhang, Zhongbin Tian, Linkai Jing, Ying Zhang, Jian Liu, Xinjian Yang
BACKGROUND: Characterization of the risk factors for rupture of very small intracranial aneurysm (VSIA, ≤3 mm) is clinically valuable, since VSIAs are implicated in subarachnoid hemorrhage. The aim of this study was to identify morphological and hemodynamic parameters that independently characterize the rupture status of VSIAs. METHODS: We conducted a retrospective study of consecutive VSIAs between September 2010 and February 2014 in our institute. A series of morphologic and hemodynamic parameters were evaluated using computational fluid dynamics, based on patient-specific three-dimensional geometrical models...
2016: Frontiers in Neurology
https://www.readbyqxmd.com/read/27932215/the-land-use-legacy-effect-towards-a-mechanistic-understanding-of-time-lagged-water-quality-responses-to-land-use-cover
#5
Sherry L Martin, Daniel B Hayes, Anthony D Kendall, David W Hyndman
Numerous studies have linked land use/land cover (LULC) to aquatic ecosystem responses, however only a few have included the dynamics of changing LULC in their analysis. In this study, we explicitly recognize changing LULC by linking mechanistic groundwater flow and travel time models to a historical time series of LULC, creating a land-use legacy map. We then illustrate the utility of legacy maps to explore relationships between dynamic LULC and lake water chemistry. We tested two main concepts about mechanisms linking LULC and lake water chemistry: groundwater pathways are an important mechanism driving legacy effects; and, LULC over multiple spatial scales is more closely related to lake chemistry than LULC over a single spatial scale...
December 5, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27928546/radiostereometric-evaluation-of-tendon-elongation-after-distal-biceps-repair
#6
Nathan E Marshall, Robert A Keller, Kelechi Okoroha, John Michael Guest, Charles Yu, Stephanie Muh, Vasilios Moutzouros
BACKGROUND: Operative repair of distal biceps tendon ruptures has shown successful outcomes. However, little is known about the amount of tendon or repair site lengthening after repair. PURPOSE/HYPOTHESIS: The purpose of this study was to evaluate distal biceps tendon repair via intratendinous radiostereometric analysis to analyze tendon lengthening at different time intervals of healing. The hypothesis was that there is significant lengthening after repair. STUDY DESIGN: Case series; Level of evidence, 4...
November 2016: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/27925707/natural-mineral-bottled-waters-available-on-the-polish-market-as-a-source-of-minerals-for-the-consumers-part-2-the-intake-of-sodium-and-potassium
#7
Anna Gątarska, Joanna Ciborska, Elżbieta Tońska
Background: Natural mineral waters are purchased and consumed according to consumer preferences and possible recommendations. The choice of appropriate water should take into account not only the general level of mineralization but also the content of individual components, including electrolytes such as sodium and potassium. Sodium is necessary to ensure the proper physiological functions of the body. It is defined as a health risk factor only when its excessive intake occurs. Potassium acts antagonistically towards sodium and calcium ions, contributes to a reduction of the volume of extracellular fluids and at the same time reduces muscle tension and permeability of cell membranes...
2016: Roczniki Państwowego Zakładu Higieny
https://www.readbyqxmd.com/read/27925596/investigating-echo-state-networks-dynamics-by-means-of-recurrence-analysis
#8
Filippo Maria Bianchi, Lorenzo Livi, Cesare Alippi
In this paper, we elaborate over the well-known interpretability issue in echo-state networks (ESNs). The idea is to investigate the dynamics of reservoir neurons with time-series analysis techniques developed in complex systems research. Notably, we analyze time series of neuron activations with recurrence plots (RPs) and recurrence quantification analysis (RQA), which permit to visualize and characterize high-dimensional dynamical systems. We show that this approach is useful in a number of ways. First, the 2-D representation offered by RPs provides a visualization of the high-dimensional reservoir dynamics...
December 2, 2016: IEEE Transactions on Neural Networks and Learning Systems
https://www.readbyqxmd.com/read/27925149/behavioural-interventions-to-promote-workers-use-of-respiratory-protective-equipment
#9
REVIEW
Bao Yen Luong Thanh, Malinee Laopaiboon, David Koh, Pornpun Sakunkoo, Hla Moe
BACKGROUND: Respiratory hazards are common in the workplace. Depending on the hazard and exposure, the health consequences may include: mild to life-threatening illnesses from infectious agents, acute effects ranging from respiratory irritation to chronic lung conditions, or even cancer from exposure to chemicals or toxins. Use of respiratory protective equipment (RPE) is an important preventive measure in many occupational settings. RPE only offers protection when worn properly, when removed safely and when it is either replaced or maintained regularly...
December 7, 2016: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/27923212/comparison-of-diabetic-charcot-patients-with-and-without-foot-wounds
#10
Dane K Wukich, David Sadoskas, Nicholas J Vaudreuil, Mitchell Fourman
BACKGROUND: The primary aim of this study was to evaluate the outcomes of a series of patients with Charcot neuroarthropathy (CN) who were evaluated in a tertiary care setting. We hypothesized that those patients with CN who presented with a Charcot-related foot wound would have lower rates of successful limb salvage than patients who presented without a wound. METHODS: Two hundred forty-five patients (280 feet) were identified with diabetic CN during the time period from January 1, 2005, to June 1, 2015...
October 23, 2016: Foot & Ankle International
https://www.readbyqxmd.com/read/27922535/association-between-short-term-exposure-to-ultrafine-particles-and-mortality-in-eight-european-urban-areas
#11
Massimo Stafoggia, Alexandra Schneider, Josef Cyrys, Evangelia Samoli, Zorana Jovanovic Andersen, Getahun Bero Bedada, Tom Bellander, Giorgio Cattani, Konstantinos Eleftheriadis, Annunziata Faustini, Barbara Hoffmann, Bénédicte Jacquemin, Klea Katsouyanni, Andreas Massling, Juha Pekkanen, Noemi Perez, Annette Peters, Ulrich Quass, Tarja Yli-Tuomi, Francesco Forastiere
BACKGROUND: Epidemiologic evidence on the association between short-term exposure to ultrafine particles and mortality is weak, due to the lack of routine measurements of these particles and standardized multi-center studies. We investigated the relationship between ultrafine particles and particulate matter (PM) and daily mortality in eight European urban areas. METHODS: We collected daily data on non-accidental and cardio-respiratory mortality, particle number concentrations (as proxy for ultrafine particle number concentration), fine and coarse PM, gases and meteorologic parameters in eight urban areas of Finland, Sweden, Denmark, Germany, Italy, Spain, and Greece, between 1999 and 2013...
November 29, 2016: Epidemiology
https://www.readbyqxmd.com/read/27920951/risk-factors-for-in-hospital-mortality-after-coronary-artery-bypass-grafting-in-patients-80%C3%A2-years-old-or-older-a-retrospective-case-series-study
#12
Jacek Piątek, Anna Kędziora, Janusz Konstanty-Kalandyk, Grzegorz Kiełbasa, Marta Olszewska, Bryan HyoChan Song, Karol Wierzbicki, Irena Milaniak, Tomasz Darocha, Dorota Sobczyk, Bogusław Kapelak
BACKGROUND: Age remains a significant and unmodifiable risk factor for cardiovascular diseases, and an increasing number of patients older than 80 years of age undergo Coronary Artery Bypass Grafting (CABG). Old age is also an independent risk factor for postoperative complications. The aim of this study is to describe the population of patients 80 years of age or older who underwent CABG procedure and to assess the mortality rate and risk factors for in-hospital mortality. METHODS: A retrospective case-series study analyzing 388 consecutive patients aged 80 years of age or older who underwent isolated CABG procedure between 2010 and 2014 in the Department of Cardiovascular Surgery and Transplantology, John Paul II Hospital, Krakow...
2016: PeerJ
https://www.readbyqxmd.com/read/27920748/multidimensional-recurrence-quantification-analysis-mdrqa-for-the-analysis-of-multidimensional-time-series-a-software-implementation-in-matlab-and-its-application-to-group-level-data-in-joint-action
#13
Sebastian Wallot, Andreas Roepstorff, Dan Mønster
We introduce Multidimensional Recurrence Quantification Analysis (MdRQA) as a tool to analyze multidimensional time-series data. We show how MdRQA can be used to capture the dynamics of high-dimensional signals, and how MdRQA can be used to assess coupling between two or more variables. In particular, we describe applications of the method in research on joint and collective action, as it provides a coherent analysis framework to systematically investigate dynamics at different group levels-from individual dynamics, to dyadic dynamics, up to global group-level of arbitrary size...
2016: Frontiers in Psychology
https://www.readbyqxmd.com/read/27920248/use-of-proton-pump-inhibitors-among-older-australians-national-quality-improvement-programmes-have-led-to-sustained-practice-change
#14
Nicole L Pratt, Lisa M Kalisch Ellett, Janet K Sluggett, Svetla V Gadzhanova, Emmae N Ramsay, Mhairi Kerr, Vanessa T LeBlanc, John D Barratt, Elizabeth E Roughead
OBJECTIVE: To evaluate the impact of national multifaceted initiatives to improve use of proton pump inhibitors (PPIs) on the use of PPIs among older Australians. DESIGN: Interrupted time series analysis using administrative health claims data from the Australian Government Department of Veterans' Affairs (DVA). SETTING: Australia. PARTICIPANTS: All veterans and dependents who received PPIs between January 2003 and December 2013...
December 4, 2016: International Journal for Quality in Health Care
https://www.readbyqxmd.com/read/27919732/learning-from-heterogeneous-temporal-data-in-electronic-health-records
#15
Jing Zhao, Panagiotis Papapetrou, Lars Asker, Henrik Boström
Electronic health records contain large amounts of longitudinal data that are valuable for biomedical informatics research. The application of machine learning is a promising alternative to manual analysis of such data. However, the complex structure of the data, which includes clinical events that are unevenly distributed over time, poses a challenge for standard learning algorithms. Some approaches to modeling temporal data rely on extracting single values from time series; however, this leads to the loss of potentially valuable sequential information...
December 2, 2016: Journal of Biomedical Informatics
https://www.readbyqxmd.com/read/27918664/modern-techniques-and-technologies-applied-to-training-and-performance-monitoring
#16
William A Sands, Ashley A Kavanaugh, Steven R Murray, Jeni R McNeal, Monèm Jemni
Athlete preparation and performance continues to increase in complexity and costs. Modern coaches are shifting from reliance on personal memory, experience, and opinion to evidence from collected training load data. Training load monitoring may hold vital information for developing systems of monitoring that follow the training process with such precision that both performance prediction and day-to-day management of training become an adjunct to preparation and performance. Time series data collection and analyses in sport are still in their infancy with considerable efforts being applied in "big-data" analytics and models of the appropriate variables to monitor and methods for doing so...
December 5, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27917358/rigorous-solution-for-1-d-consolidation-of-a-clay-layer-under-haversine-cyclic-loading-with-rest-period
#17
Nina Müthing, Sabah S Razouki, Maria Datcheva, Tom Schanz
Presented in this paper is a rigorous solution of the conventional Terzaghi one-dimensional consolidation under haversine cyclic loading with any rest period. The clay deposit is either permeable at both top and bottom or permeable at the top and impermeable at the bottom. This exact analytical solution was achieved using Fourier harmonic analysis for the periodic function representing the rate of imposition of excess pore water pressure. The double Fourier series in the rigorous solution was found to be rapidly convergent...
2016: SpringerPlus
https://www.readbyqxmd.com/read/27916944/trend-residual-dual-modeling-for-detection-of-outliers-in-low-cost-gps-trajectories
#18
Xiaojian Chen, Tingting Cui, Jianhong Fu, Jianwei Peng, Jie Shan
Low-cost GPS (receiver) has become a ubiquitous and integral part of our daily life. Despite noticeable advantages such as being cheap, small, light, and easy to use, its limited positioning accuracy devalues and hampers its wide applications for reliable mapping and analysis. Two conventional techniques to remove outliers in a GPS trajectory are thresholding and Kalman-based methods, which are difficult in selecting appropriate thresholds and modeling the trajectories. Moreover, they are insensitive to medium and small outliers, especially for low-sample-rate trajectories...
December 1, 2016: Sensors
https://www.readbyqxmd.com/read/27916663/monitoring-cardiac-and-respiratory-physiology-during-fmri
#19
Daniel Bulte, Karolina Wartolowska
This article will consider how physiological monitoring can be used both as an intrinsic part of an experiment, or for removing unwanted physiological signals from the FMRI time series. As functional MRI is used for a wide variety of applications beyond the identification of regions involved in a task, different sources of noise in the time series become important. The use of arterial spin labelling sequences, either in isolation or combined with BOLD imaging, means that temporal noise must be dealt with differently...
December 1, 2016: NeuroImage
https://www.readbyqxmd.com/read/27916658/referenceless-one-dimensional-nyquist-ghost-correction-in-multicoil-single-shot-spatiotemporally-encoded-mri
#20
Ying Chen, Yupeng Liao, Lisha Yuan, Hui Liu, Seong Dae Yun, Nadim Joni Shah, Zhong Chen, Jianhui Zhong
Single-shot spatiotemporally encoded (SPEN) MRI is a novel fast imaging method capable of retaining the time efficiency of single-shot echo planar imaging (EPI) but with distortion artifacts significantly reduced. Akin to EPI, the phase inconsistencies between mismatched even and odd echoes also result in the so-called Nyquist ghosts. However, the characteristic of the SPEN signals provides the possibility of obtaining ghost-free images directly from even and odd echoes respectively, without acquiring additional reference scans...
December 1, 2016: Magnetic Resonance Imaging
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