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Search Results: 1 - 10 of 30723 matches for " Louis-Martin Boucher "
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Minioptical Navigation System for CT-Guided Percutaneous Liver Procedures  [PDF]
David A. Valenti, Louis-Martin Boucher, Giovanni Artho, Christopher von Jako, Tatiana Cabrera
Advances in Computed Tomography (ACT) , 2013, DOI: 10.4236/act.2013.23014
Abstract:

Purpose: To evaluate a new miniature optical navigation system for CT-guided liver interventions. Material and Methods: A two-center, prospective study was performed with four interventional radiologists. A total of 20 patients had CT-guided liver biopsy or ablation interventions utilizing the CT-Guide? navigation system (ActiViews Inc., Wakefield, MA) between July 2011 and December 2011. The navigation system consists of a self-adhesive patientsticker printed with coincident colored and radio-opaque reference markers, a miniature disposable video camera that clips on and off an interventional instrument, and software loaded on a computer to display the navigation information. The primary end point was the frequency of a satisfactory instrument position for the intended intervention. Results: The cohort consisted of 13 males and 7 females with an average age of 63.1 years (range of 38 to 80). Most of the patients, 70%, underwent CT-guided liver biopsy while the remainder had CT-guided ablation therapy. The average lesion size was 3.1 cm (range

On Global Warming (Softening Global Constraints)
Willem Jan van Hoeve,Gilles Pesant,Louis-Martin Rousseau
Computer Science , 2004,
Abstract: We describe soft versions of the global cardinality constraint and the regular constraint, with efficient filtering algorithms maintaining domain consistency. For both constraints, the softening is achieved by augmenting the underlying graph. The softened constraints can be used to extend the meta-constraint framework for over-constrained problems proposed by Petit, Regin and Bessiere.
The relationship between serum sodium and intracranial pressure when using hypertonic saline to target mild hypernatremia in patients with head trauma
Diana L Wells, Joseph M Swanson, G Christopher Wood, Louis J Magnotti, Bradley A Boucher, Martin A Croce, Charles G Harrison, Michael S Muhlbauer, Timothy C Fabian
Critical Care , 2012, DOI: 10.1186/cc11678
Abstract: A retrospective review of patients who were admitted to the trauma ICU for TBI, had an ICP monitor placed, and received at least one dose of HTS between January 2006 and March 2011 was performed. Data were collected for up to 120 hours after ICP monitor placement. The primary outcome was the relationship between serum sodium and maximum ICP. Secondary outcomes were the relationship between serum sodium and the mean number of daily interventions for ICP control, and the acute effect of HTS on ICP during the 6 hours after each dose. Linear regression was used to analyze the primary outcome. Analysis of variance on ranks and repeated measures analysis of variance were used to evaluate the number of interventions and the acute effect of HTS on ICP, respectively.Eighty-one patients were enrolled with mean ± standard deviation age of 36 ± 15 years and median Glasgow Coma Scale score of 7 (interquartile range, 4 to 7). A total of 1,230 serum sodium values (range, 118 to174 mEq/l) and 7,483 ICP values (range, 0 to 159 mmHg) were collected. There was no correlation between serum sodium and maximum ICP (R2 = 0.0052). The overall mean ± standard deviation number of interventions for elevated ICP per day was 4.2 ± 2.9, 2.9 ± 2.0, and 2.6 ± 2.3 for patients with a mean serum sodium of < 145, 145 to 155, and > 155 mEq/l, respectively (P < 0.001). Regarding the acute effect of HTS on ICP, there was no statistical difference in mean ICP compared with baseline during hours 1 through 6 following HTS doses (baseline, 13.7 ± 8.4 mmHg; hour 1, 13.6 ± 8.3 mmHg; hour 2, 13.5 ± 8.8 mmHg; hour 3, 13.3 ± 8.7 mmHg; hour 4, 13.4 ± 8.7 mmHg; hour 5, 13.4 ± 8.3 mmHg; hour 6, 13.5 ± 8.3 mmHg; P = 0.84).Serum sodium concentrations did not correlate with ICP values. These results warrant further evaluation and possible reassessment of sodium goals for ICP management in patients with TBI.Traumatic brain injury (TBI) is the leading cause of morbidity and mortality in young adults [1]. When treating T
Holocene Sea-Level History Along Eastern-Southeastern Brazil
Louis Martin
Anuário do Instituto de Geociências , 2003,
Abstract: Relative sea-level curves have been delineated for several sectors of the Brazilian coast. In order to have homogeneous and consistent curves, very short segments of the coastline with the same framework are considered. To minimize systematic errors tied to the particular nature of an indicator, we use the maximum number of different indicators available from former positions of relative sea level. These sea-level curves show that, during the last 7000 years, the central Brazilian coast has been subjected to a submergence phase which lasted until 5100 14C yr BP (5600 cal yr BP), followed by a drop in sea level. This drop in sea level was not continuous but was interrupted by two high-frequency oscillations. The Salvador curve, the most detailed, can be used as a reference for the central portion of the Brazilian coastline. It is now presented with corrections for isotopic fractionation and reservoir effects as well as calibrations for astronomical ages. Additional supporting evidence for the existence of high-frequency oscillations is provided. They are of the same magnitude as is predicted for the future under greenhouse conditions. These data will help us to understand how the coastal systems will respond to these sea-level changes.
Efeito de diferentes épocas e modos de aplica??o do nitrogênio na produ??o do milho, na quantidade de proteína, na eficiência do fertilizante, e na diagnose foliar, utilizando o sulfato de am?nio-15N
Neptune, André Martin Louis;
Anais da Escola Superior de Agricultura Luiz de Queiroz , 1977, DOI: 10.1590/S0071-12761977000100041
Abstract: the experiment herein described was carried out in a podzolic soil, in the state of s?o paulo, brazil, with the double hybrid corn hd-6999 b. the folowing conlclusion can be drawn: 1) in respect the placement and times of nitrogen fertilizer application, the data showed there was no significant difference among the methods of application, although the plots which received the nitrogen a) in banding, b) in banding plus sidedressing or c) in plowrig down plus sidedressing, gave better yields. (7.100 kg/ha). these data were corroborated by the per cent uptake of nitrogen in the plant derived from the fertilizer. 2) sidedressing nitrogen, 40 days after sowing, gave the higher quantity of protein (377 kg/ha) coming from the fertilizer and the higher efficiency of the nitrogen fertilizer in its conversion in protein (60%). 3) good correlation (r = 0.691) has been found between corn yield and concentration of nitrogen in the leaf chose for diagnostic purpose of the n status of the corn plant.
Filling in CMB map missing data using constrained Gaussian realizations
Martin Bucher,Thibaut Louis
Physics , 2011, DOI: 10.1111/j.1365-2966.2012.21138.x
Abstract: For analyzing maps of the cosmic microwave background sky, it is necessary to mask out the region around the galactic equator where the parasitic foreground emission is strongest as well as the brightest compact sources. Since many of the analyses of the data, particularly those searching for non-Gaussianity of a primordial origin, are most straightforwardly carried out on full-sky maps, it is of great interest to develop efficient algorithms for filling in the missing information in a plausible way. We explore practical algorithms for filling in based on constrained Gaussian realizations. Although carrying out such realizations is in principle straightforward, for finely pixelized maps as will be required for the Planck analysis a direct brute force method is not numerically tractable. We present some concrete solutions to this problem, both on a spatially flat sky with periodic boundary conditions and on the pixelized sphere. One approach is to solve the linear system with an appropriately preconditioned conjugate gradient method. While this approach was successfully implemented on a rectangular domain with periodic boundary conditions and worked even for very wide masked regions, we found that the method failed on the pixelized sphere for reasons that we explain here. We present an approach that works for full-sky pixelized maps on the sphere involving a kernel-based multi-resolution Laplace solver followed by a series of conjugate gradient corrections near the boundary of the mask.
Unbreakable Loops
Martin Beaudry,Louis Marchand
Mathematics , 2010,
Abstract: We say that a loop is unbreakable when it does not have nontrivial subloops. While the cyclic groups of prime order are the only unbreakable finite groups, we show that nonassociative unbreakable loops exist for every order n >= 5. We describe two families of commutative unbreakable loops of odd order, n >= 7, one where the loop's multiplication group is isomorphic to the alternating group An and another where the multiplication group is isomorphic to the symmetric group Sn. We also prove for each even n >= 6 that there exist unbreakable loops of order n whose multiplication group is isomorphic to Sn.
Misassembly Detection using Paired-End Sequence Reads and Optical Mapping Data
Martin D. Muggli,Simon J. Puglisi,Roy Ronen,Christina Boucher
Computer Science , 2014,
Abstract: A crucial problem in genome assembly is the discovery and correction of misassembly errors in draft genomes. We develop a method that will enhance the quality of draft genomes by identifying and removing misassembly errors using paired short read sequence data and optical mapping data. We apply our method to various assemblies of the loblolly pine and Francisella tularensis genomes. Our results demonstrate that we detect more than 54% of extensively misassembled contigs and more than 60% of locally misassembed contigs in an assembly of Francisella tularensis, and between 31% and 100% of extensively misassembled contigs and between 57% and 73% of locally misassembed contigs in the assemblies of loblolly pine. MISSEQUEL can be downloaded at http://www.cs.colostate.edu/seq/.
Land and Forest Degradation inside Protected Areas in Latin America
Craig Leisher,Jerome Touval,Sebastiaan M. Hess,Timothy M. Boucher,Louis Reymondin
Diversity , 2013, DOI: 10.3390/d5040779
Abstract: Using six years of remote sensing data, we estimated land and forest degradation inside 1788 protected areas across 19 countries in Latin America. From 2004–2009, the rate of land and forest degradation increased by 250% inside the protected areas, and the land and forest degradation totaled 1,097,618 hectares. Of the protected areas in our dataset, 45% had land and forest degradation. There were relatively large variations by major habitat type, with flooded grasslands/savannas and moist broadleaf forest protected areas having the highest rates of degradation. We found no association between a country’s rate of land and forest degradation inside protected areas and Gross Domestic Product (GDP) per capita, GDP growth, or rural population density. We found significant, but weak, associations between the rate of land and forest degradation inside protected areas and a country’s protected area system funding, the size of the protected area, and one International Union for the Conservation of Nature (IUCN) management category. Our results suggest a high degree of heterogeneity in the variables impacting land and forest degradation inside protected areas in Latin America, but that the targeting of protected area investments on a continental scale is plausible.
Long-Memory and Spurious Breaks in Ecological Experiments  [PDF]
Thomas R. Boucher
Open Journal of Statistics (OJS) , 2017, DOI: 10.4236/ojs.2017.75054
Abstract: The impact of long-memory on the Before-After-Control-Impact (BACI) design and a commonly used nonparametric alternative, Randomized Intervention Analysis (RIA), is examined. It is shown the corrections used based on short-memory processes are not adequate. Long-memory series are also known to exhibit spurious structural breaks that can be mistakenly attributed to an intervention. Two examples from the literature are used as illustrations.
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