Dissertations / Theses on the topic 'Context refinement'
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Menart, Christopher J. Menart. "Global-Context Refinement for Semantic Image Segmentation." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1523462175806808.
Full textUle, Tylman. "Treebank refinement optimising representations of syntactic analyses for probabilistic context-free parsing /." [S.l. : s.n.], 2007.
Find full textBietra, Danielle. "Examing Positive Psychological Constructs in the Context of 12-Step Recovery." NSUWorks, 2015. http://nsuworks.nova.edu/cps_stuetd/85.
Full textDarracott, Rosalyn M. "The development and refinement of the practice domain framework as a conceptual tool for understanding and guiding social care practice." Thesis, Queensland University of Technology, 2015. https://eprints.qut.edu.au/86048/15/86048.pdf.
Full textPetria, Marius. "Generic refinements for behavioral specifications." Thesis, University of Edinburgh, 2011. http://hdl.handle.net/1842/4889.
Full textDavey, Robert Paul. "Refinement and validation of algorithms for deduction of gene content from CGH microarrays." Thesis, University of East Anglia, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.429607.
Full textDittmann, Maik [Verfasser]. "Isogeometric analysis and hierarchical refinement for multi-field contact problems / Maik Dittmann." Karlsruhe : KIT Scientific Publishing, 2017. http://www.ksp.kit.edu.
Full textFeldman, Jonathan. "Dynamic refinement and boundary contact forces in smoothed particle hydrodynamics with applications in fluid flow problems." Thesis, Swansea University, 2006. https://cronfa.swan.ac.uk/Record/cronfa42459.
Full textAl-Helal, Kawther. "New approaches to casting hypereutectic Al-Si alloys to achieve simultaneous refinement of primary silicon and modification of eutectic silicon." Thesis, Brunel University, 2013. http://bura.brunel.ac.uk/handle/2438/8167.
Full textCascavita, Mellado Karol. "Méthodes de discrétisation hybrides pour les problèmes de contact de Signorini et les écoulements de Bingham." Thesis, Paris Est, 2018. http://www.theses.fr/2018PESC1158/document.
Full textThis thesis is concerned with the devising and the analysis of hybrid discretization methods for nonlinear variational inequalities arising in computational mechanics. Salient advantages of such methods are local conservation at the cell level, robustness in different regimes and the possibility to use polygonal/polyhedral meshes with hanging nodes, which is very attractive in the context of mesh adaptation. Hybrid discretizations methods are based on discrete unknowns attached to the mesh faces. Discrete unknowns attached to the mesh cells are also used, but they can be eliminated locally by static condensation. Two main applications of hybrid discretizations methods are addressed in this thesis. The first one is the treatment using Nitsche's method of Signorini's contact problem (in the scalar-valued case) with a nonlinearity in the boundary conditions. We prove optimal error estimates leading to energy-error convergence rates of order (k+1) if face polynomials of degree k >= 0 are used. The second main application is on viscoplastic yield flows. We devise a discrete augmented Lagrangian method applied to the present hybrid discretization. We exploit the capability of hybrid methods to use polygonal meshes with hanging nodes to perform local mesh adaptation and better capture the yield surface. The accuracy and performance of the present schemes is assessed on bi-dimensional test cases including comparisons with the literature
Liu, Hao. "Stratégie de raffinement automatique de maillage et méthodes multi-grilles locales pour le contact : application à l'interaction mécanique pastille-gaine." Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM4720/document.
Full textThis Ph.D. work takes place within the framework of studies on Pellet-Cladding mechanical Interaction (PCI) which occurs in the fuel rods of pressurized water reactor. This manuscript focuses on automatic mesh refinement to simulate more accurately this phenomena while maintaining acceptable computational time and memory space for industrial calculations. An automatic mesh refinement strategy based on the combination of the Local Defect Correction multigrid method (LDC) with the Zienkiewicz and Zhu a posteriori error estimator is proposed. The estimated error is used to detect the zones to be refined, where the local subgrids of the LDC method are generated. Several stopping criteria are studied to end the refinement process when the solution is accurate enough or when the refinement does not improve the global solution accuracy anymore.Numerical results for elastic 2D test cases with pressure discontinuity shows the efficiency of the proposed strategy.The automatic mesh refinement in case of unilateral contact problems is then considered. The strategy previously introduced can be easily adapted to the multibody refinement by estimating solution error on each body separately. Post-processing is often necessary to ensure the conformity of the refined areas regarding the contact boundaries. A variety of numerical experiments with elastic contact (with or without friction, with or without an initial gap) confirms the efficiency and adaptability of the proposed strategy
Thiriet, Tony. "Traitement mécaniques et thermochimiques couplés sur acier inoxydable et alliage base nickel austénitiques." Thesis, Vandoeuvre-les-Nancy, INPL, 2010. http://www.theses.fr/2010INPL064N/document.
Full textRecent scientific work has opened new fields of application to mechanical treatments such as shot blasting or peening. Indeed, it has been shown that this treatment, performed before a nitriding treatment on the surface of ferrous alloy, lowers processing temperatures and significantly increases the diffusion kinetics. We undertook to test this combination of mechanical and thermochemical treatments on stainless steels and nickel-based alloys. The mechanical treatments were done by Surface Mechanical Attrition Treatment (SMAT). This method is implemented in a box where metal or ceramic balls were introduced and set in motion by an ultrasound system in order to impact the surface of the pieces. The treated samples were then nitrided at low temperature by using a remote plasma. The comparison of the results obtained after nitriding treatments on mechanically treated samples and those not mechanically treated allows quantifying the effects of the combined treatments. Analyses by X-ray diffraction, microhardness measurement, observations by optical and scanning and transmission electron microscopy, texture analysis by EBSD (Electron Diffraction BackScatered) and measurement of nitrogen concentration profiles by SIMS (Secondary Ion Mass Spectrometry) show the importance of the nature of the deformed layer
JI, Zhi-kai, and 紀至鍇. "Context Pattern Clustering Applied to Query Refinement for Text Retrieval." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/77ugf6.
Full text國立臺灣科技大學
資訊管理系
102
The aim of this research is to cluster the context patterns of the query and resolve the relevant topics of documents according the most discriminative context words for the clusters. First, context patterns are extracted from documents and converted into feature space by latent semantic indexing, in which pattern clustering is conducted. These clusters are then refined to remove the patterns close to the boundary, and the words for the remaining patterns within each cluster are extracted and sorted so as to obtain the most discriminative context words. These words are further used to re-ranking the documents and the purities of the top 20 documents are evaluated. Experimental results based on the context patterns of the query “apple” shows, GMM-based clustering can achieve significantly better clustering performance (F-measure) than K-means or agglomerative clustering, since GMM is based on parametric model that has better generalization capability and takes into account the distance normalization by covariance. In addition, the discriminative context words added into the query individually can improve the retrieval performance (purity of top 20 documents) from 0.85 to 0.96, and cluster refinement can further improve the purity to 0.973. When the proposed scheme was used to analyze the clusters of the context patterns for such queries as “rocket”, “Eva”, “expired” and “Philippine”, the relevant topics can be resolved effectively, which may help to induce the word senses or track the events of various topics.
Shurrab, O., and Irfan U. Awan. "Performance evaluation for process refinement stage of SWA system." 2015. http://hdl.handle.net/10454/9221.
Full textAbstract: In periodic manner the analysts teams are in the process of designing, updating and verifying the situational awareness SWA system. Initially, at the designing stage the risk assessment model has little information about the dynamic environment. Hence, any missing information can directly impact the situational assessment capabilities. With this in mind, researchers relied on various performance metrics in order to verify how well they were doing in assessing different situations. In fact, before measuring the ranking capabilities of the SWA system, the underlying performance metrics should be examined against its intended purpose. In this paper, we have conducted quality based evaluations for the performance metrics, namely "The Ranking Capability Score". The results obtained showed that the proposed performance metrics have scaled well over a number of scenarios. Indeed, from the data fusion perspectives the underlying metrics have adequately satisfied different SWA system needs and configurations.
Ule, Tylman [Verfasser]. "Treebank refinement : optimising representations of syntactic analyses for probabilistic context-free parsing / von Tylman Ule." 2008. http://d-nb.info/988312093/34.
Full textChemboli, Srinivas. "Omnispective analysis and reasoning: an epistemic approach to scientific workflows." Phd thesis, 2012. http://hdl.handle.net/1885/10556.
Full textIvan, Lucian. "Development of High-order CENO Finite-volume Schemes with Block-based Adaptive Mesh Refinement (AMR)." Thesis, 2011. http://hdl.handle.net/1807/29759.
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