Relevant bibliographies by topics / Simulation and reconstruction

Academic literature on the topic 'Simulation and reconstruction'

Author: Grafiati
Published: 11 March 2023

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Journal articles on the topic "Simulation and reconstruction"

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Friduss, Michael, Paul Dagum, Alexander Mandych, and Angelo Reppucci. "Forehead Flap in Nasal Reconstruction." Otolaryngology–Head and Neck Surgery 113, no. 6 (December 1995): 740–47. http://dx.doi.org/10.1016/s0194-59989570014-5.

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We establish criteria for aesthetic forehead flap reconstructions and evaluate the effect of mathematical models and computer simulation of the operation in preoperative and perioperative planning. We study a case series of 13 patients in an academic tertiary referral medical center. Most patients had nasal defects after Mohs' surgery for tumor ablation. Patients were followed up for 2 years after reconstructive surgery. Three patients underwent midline forehead flap nasal reconstructions, and 10 patients underwent paramedian forehead flap nasal reconstructions. We used patient satisfaction and physician evaluation of aesthetic form and function restoration as the main outcome measures. There were no major complications. Minor complications included short-term pincushioning in all patients, scar contracture that resolved after 8 months in one patient, and forehead necrosis after primary closure of the upper forehead in one patient. Computer simulation correlated two-dimension flap design to the transposition process. We conclude that the forehead flap is the optimal reconstructive modality for resurfacing large nasal defects. The paramedian forehead flap is superior to the midline forehead flap for nasal reconstruction, especially for distal tip reconstructions. Mathematical models and computer simulation of the reconstructive procedure that relate the two-dimensional flap design to the transposition process reveal subtle geometric relationships of the flap transposition that facilitate the design of the optimal flap for reconstruction.
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González-Rouco, J. F., H. Beltrami, E. Zorita, and M. B. Stevens. "Borehole climatology: a discussion based on contributions from climate modeling." Climate of the Past 5, no. 1 (March 19, 2009): 97–127. http://dx.doi.org/10.5194/cp-5-97-2009.

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Abstract. Progress in understanding climate variability through the last millennium leans on simulation and reconstruction efforts. Exercises blending both approaches present a great potential for answering questions relevant both for the simulation and reconstruction of past climate, and depend on the specific peculiarities of proxies and methods involved in climate reconstructions, as well as on the realism and limitations of model simulations. This paper explores research specifically related to paleoclimate modeling and borehole climatology as a branch of climate reconstruction that has contributed significantly to our knowledge of the low frequency climate evolution during the last five centuries. The text flows around three main issues that group most of the interaction between model and geothermal efforts: the use of models as a validation tool for borehole climate reconstructions; comparison of geothermal information and model simulations as a means of either model validation or inference about past climate; and implications of the degree of realism on simulating subsurface climate on estimations of future climate change. The use of multi-centennial simulations as a surrogate reality for past climate suggests that within the simplified reality of climate models, methods and assumptions in borehole reconstructions deliver a consistent picture of past climate evolution at long time scales. Comparison of model simulations and borehole profiles indicate that borehole temperatures are responding to past external forcing and that more realism in the development of the soil model components in climate models is desirable. Such an improved degree of realism is important for the simulation of subsurface climate and air-ground interaction; results indicate it could also be crucial for simulating the adequate energy balance within climate change scenario experiments.
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González-Rouco, J. F., H. Beltrami, E. Zorita, and M. B. Stevens. "Borehole climatology: a discussion based on contributions from climate modeling." Climate of the Past Discussions 4, no. 1 (January 21, 2008): 1–80. http://dx.doi.org/10.5194/cpd-4-1-2008.

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Abstract. Progress in understanding climate variability through the last millennium leans on simulation and reconstruction efforts. Exercises blending both approaches present a great potential for answering questions relevant both for the simulation and reconstruction of past climate, and depend on the specific peculiarities of proxies and methods involved in climate reconstructions, as well as on the realism and limitations of model simulations. This paper explores research specifically related to paleoclimate modeling and borehole climatology as a branch of climate reconstruction that has contributed significantly to our knowledge of the low frequency climate evolution during the last five centuries. The text flows around three main issues that group most of the interaction between model and geothermal efforts: the use of models as a validation tool for borehole climate reconstructions; comparison of geothermal information and model simulations as a means of either model validation or inference about past climate; and implications of the degree of realism on simulating subsurface climate on estimations of future climate change. The use of multi-centennial simulations as a surrogate reality for past climate suggests that within the simplified reality of climate models, methods and assumptions in borehole reconstructions deliver a consistent picture of past climate evolution at long time scales. Comparison of model simulations and borehole profiles indicate that borehole temperatures are responding to past external forcing and that more realism in the development of the soil model components in climate models is desirable. Such an improved degree of realism is important for the simulation of subsurface climate and air-ground interaction; results indicate it could also be crucial for simulating the adequate energy balance within climate change scenario experiments.
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Tran, Khanh Linh, Matthew Lee Mong, James Scott Durham, and Eitan Prisman. "Benefits of Patient-Specific Reconstruction Plates in Mandibular Reconstruction Surgical Simulation and Resident Education." Journal of Clinical Medicine 11, no. 18 (September 9, 2022): 5306. http://dx.doi.org/10.3390/jcm11185306.

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Poorly contoured mandibular reconstruction plates are associated with postoperative complications. Recently, a technique emerged whereby preoperative patient-specific reconstructive plates (PSRP) are developed in the hopes of eliminating errors in the plate-bending process. This study’s objective is to determine if reconstructions performed with PSRP are more accurate than manually contoured plates. Ten Otolaryngology residents each performed two ex vivo mandibular reconstructions, first using a PSRP followed by a manually contoured plate. Reconstruction time, CT scans, and accuracy measurements were collected. Paired Student’s t-test was performed. There was a significant difference between reconstructions with PSRP and manually contoured plates in: plate-mandible distance (0.39 ± 0.21 vs. 0.75 ± 0.31 mm, p = 0.0128), inter-fibular segment gap (0.90 ± 0.32 vs. 2.24 ± 1.03 mm, p = 0.0095), mandible-fibula gap (1.02 ± 0.39 vs. 2.87 ± 2.38 mm, p = 0.0260), average reconstruction deviation (1.11 ± 0.32 vs. 1.67 ± 0.47 mm, p = 0.0228), mandibular angle width difference (5.13 ± 4.32 vs. 11.79 ± 4.27 mm, p = 0.0221), and reconstruction time (16.67 ± 4.18 vs. 33.78 ± 8.45 min, p = 0.0006). Lower plate-mandible distance has been demonstrated to correlate with decreased plate extrusion rates. Similarly, improved bony apposition promotes bony union. PSRP appears to provide a more accurate scaffold to guide the surgeons in assembling donor bone segments, which could potentially improve patient outcome and reduce surgical time. Additionally, in-house PSRP can serve as a low-cost surgical simulation tool for resident education.
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Ljungqvist, Fredrik Charpentier, Qiong Zhang, Gudrun Brattström, Paul J. Krusic, Andrea Seim, Qiang Li, Qiang Zhang, and Anders Moberg. "Centennial-Scale Temperature Change in Last Millennium Simulations and Proxy-Based Reconstructions." Journal of Climate 32, no. 9 (April 12, 2019): 2441–82. http://dx.doi.org/10.1175/jcli-d-18-0525.1.

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AbstractSystematic comparisons of proxy-based reconstructions and climate model simulations of past millennium temperature variability offer insights into climate sensitivity and feedback mechanisms, besides allowing model evaluation independently from the period covered by instrumental data. Such simulation–reconstruction comparisons can help to distinguish more skillful models from less skillful ones, which may subsequently help to develop more reliable future projections. This study evaluates the low-frequency simulation–reconstruction agreement within the past millennium through assessing the amplitude of temperature change between the Medieval Climate Anomaly (here, 950–1250 CE) and the Little Ice Age (here, 1450–1850 CE) in PMIP3 model simulations compared to proxy-based local and continental-scale reconstructions. The simulations consistently show a smaller temperature change than the reconstructions for most regions in the Northern Hemisphere, but not in the Southern Hemisphere, as well as a partly different spatial pattern. A cost function analysis assesses how well the various simulations agree with reconstructions. Disregarding spatial correlation, significant differences are seen in the agreement with the local temperature reconstructions between groups of models, but insignificant differences are noted when compared to continental-scale reconstructions. This result points toward a limited possibility to “rank” models by means of their low-frequency temperature variability alone. The systematically lower amplitude of simulated versus reconstructed temperature change indicates either too-small simulated internal variability or that the analyzed models lack some critical forcing or have missing or too-weak feedback mechanisms. We hypothesize that too-cold initial ocean conditions in the models—in combination with too-weak internal variability and slow feedbacks over longer time scales—could account for much of the simulation–reconstruction disagreement.
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Xu, Han, Cynthia Changxin Wang, Xuesong Shen, and Sisi Zlatanova. "3D Tree Reconstruction in Support of Urban Microclimate Simulation: A Comprehensive Literature Review." Buildings 11, no. 9 (September 17, 2021): 417. http://dx.doi.org/10.3390/buildings11090417.

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The negative climate change induced by rapid urbanization has become a global environmental issue. Numerous studies have been devoted to microclimate regulation functions performed by urban vegetation. Digital city information modeling provides a powerful tool for various simulations and data analytics for the sustainable development of urban areas. However, the method reconstructing urban trees is still in its early stage compared to the relatively mature building modeling. Most prior studies on tree reconstruction focused on retrieving geometric features, while other factors related to urban microclimate simulation were rarely addressed. This paper presents a comprehensive literature review and in-depth analysis covering two distinct research directions in relation to urban microclimate simulation. The first one is set on the identification of key factors related to trees’ impact on urban microclimate. The second one is dedicated to approaches for three-dimensional (3D) tree reconstruction. Based on the findings, the paper identifies information including trees’ geometric, physiological characteristics and relation to the surroundings required for 3D tree reconstruction in the context of urban microclimate simulation, and further assesses the potential of the 3D tree reconstruction approaches to accommodate these pieces of information. An appropriate 3D tree reconstruction approach, which allows for the supply of the required information for urban microclimate simulation, is recommended.
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Ballarotta, M., K. Döös, P. Lundberg, L. Brodeau, and J. Brandefelt. "A Last Glacial Maximum World-Ocean simulation at eddy-permitting resolution – Part 2: Confronting the paleo-proxy data." Climate of the Past Discussions 9, no. 1 (January 18, 2013): 329–50. http://dx.doi.org/10.5194/cpd-9-329-2013.

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Abstract. Previous investigations concerning the design of an eddy-permitting LGM oceanic simulation are here extended with focus on whether this type of simulation is capable of improving the numerical results with regard to the available paleo-proxy reconstructions. Consequently, an eddy-permitting and two coarse-grid simulations of the same LGM period are confronted with a dataset from the Multiproxy Approach for the Reconstruction of the Glacial Ocean Sea Surface Temperatures (MARGO SSTs) and a number of sea-ice reconstructions. From a statistical analysis it was found that the eddy-permitting simulation does not significantly improve the SST representation with regard to the paleo-reconstructions. The western boundary currents are better resolved in the high-resolution experiment than in the coarse simulations, but, although these more detailed SST structures yield a locally improved consistency between modelled predictions and proxies, they do not contribute significantly to the global statistical score. As in the majority of the PMIP2 simulations, the modelled sea-ice conditions are still inconsistent with the paleo-reconstructions, probably due to the choice of the model equilibrium.
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Yang, Xiao Long, Ping Li, Tao Lv, and Xue Hua Liao. "Traffic Accident Reconstruction Technology Research." Advanced Materials Research 756-759 (September 2013): 946–51. http://dx.doi.org/10.4028/www.scientific.net/amr.756-759.946.

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Based on the virtual simulation theory, we used three-dimensional modeling software to build modeling road facilities (vehicles, trees, street lights, etc.) for simulating the accident environment, and by using OpenGL technology, achieved reading, displaying and controlling the three-dimensional models. This dynamically realized the three-dimensional animated simulation of vehicle movement. Simultaneously we have calculated in progress the simulation of vehicle crash with the basic theory of automobile collision, vehicle collision model and the law of conservation of energy and momentum. Finally, we constructed a flexible platform for the simulation experiment. The platform is enabling to add and update road, trees, street lamps and house on the simulation environment dynamically, and has ability to analysis the traffic accident. This could give an assistant to the handling traffic accidents.
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He, Jing. "Multimedia Vision Improvement and Simulation in Consideration of Virtual Reality Reconstruction Algorithms." Journal of Electrical and Computer Engineering 2022 (May 12, 2022): 1–10. http://dx.doi.org/10.1155/2022/4968588.

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Due to the large noise and many discrete points of the image in the traditional image reconstruction process, the reconstruction quality of the image deviates greatly from the actual target. In this study, the virtual reality reconstruction algorithm is applied to multimedia vision, the virtual reality image is corrected by using the binocular offset positioning method, the denoising process is performed in the image reconstruction process, and the high-pass filter matrix is used to improve the image reproduction. At the same time, the three-dimensional reconstruction algorithm is used to perform correlation retrieval, the ensemble point set and the discrete point set are obtained, the maximum and minimum reconstruction degree areas are clarified, and the deviation reconstruction and peak relocation can be performed. Finally, the experimental test results show that the algorithm in this study can enhance the authenticity of image reconstruction, improve the accuracy of image corner detection, and effectively reduce the noise interference in the process of reconstructing the image.
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Qi, Yusheng, Wenting Xiao, and Dick K. P. Yue. "Phase-Resolved Wave Field Simulation Calibration of Sea Surface Reconstruction Using Noncoherent Marine Radar." Journal of Atmospheric and Oceanic Technology 33, no. 6 (June 2016): 1135–49. http://dx.doi.org/10.1175/jtech-d-15-0130.1.

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AbstractThe possibility of reconstructing sea surface wave fields from a noncoherent X-band marine radar return has much potential for maritime operations and ocean engineering. The existing reconstruction method extracts the signal associated with gravity waves that satisfy the dispersion relationship. The process involves parameters related to how the radar signal is modulated by waves of different lengths, propagation directions, amplitudes, and phases. In the absence of independent wave measurements, these reconstruction parameters cannot be rationally adjusted according to wave field conditions, and the predictions are generally of uneven accuracy and reliability. A new reconstruction method based on concurrent phase-resolved wave field simulations is proposed. By maximizing the correlation between the reconstructed and simulated wave fields over time, optimal values of the reconstruction parameters are obtained that are found to vary appreciably with the wave field properties and with the location and size of the subdomain being sensed and reconstructed. With this phase-resolved simulation calibrated (PRSC) approach, the correlation between the evolving reconstructed wave field and that based on phase-resolved simulation, which measures the consistency and fidelity of the reconstruction, is improved significantly (by up to a factor of 2) and is obtained in a substantially broader range of sea states compared to existing methods.
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Dissertations / Theses on the topic "Simulation and reconstruction"

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Stevenson, Timothy James. "Simulation of Vehicle-Pedestrian Interaction." Thesis, University of Canterbury. Mechanical Engineering, 2006. http://hdl.handle.net/10092/1180.

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The literature on vehicle crash reconstruction provides a number of empirical or classical theoretical models for the distance pedestrians are thrown in impacts with various types of vehicles and impact speeds. The aim of this research was to compare the predictions offered by computer simulation to those obtained using the empirical and classical theoretical models traditionally utilised in vehicle-pedestrian accident reconstruction. Particular attention was paid to the pedestrian throw distance versus vehicle impact speed relationship and the determination of pedestrian injury patterns and associated severity. It was discovered that computer simulation offered improved pedestrian kinematic prediction in comparison to traditional vehicle-pedestrian accident reconstruction techniques. The superior kinematic prediction was found to result in a more reliable pedestrian throw distance versus vehicle impact speed relationship, particularly in regard to varying vehicle and pedestrian parameters such as shape, size and orientation. The pedestrian injury prediction capability of computer simulation was found to be very good for head and lower extremity injury determination. Such injury prediction capabilities were noted to be useful in providing additional correlation of vehicle impact speed predictions, whether these predictions were made using computer simulation, traditional vehicle-pedestrian accident reconstruction methods or a combination of both. A generalised approach to the use of computer simulation for the reconstruction of vehicle-pedestrian accidents was also offered. It is hoped that this approach is developed and improved by other researchers so that over time guidelines for a standardised approach to the simulation of vehicle-pedestrian accidents might evolve. Thoracic injury prediction, particularly for frontal impacts, was found to be less than ideal. It is suspected that the relatively poor thoracic biofidelity stems from the development of pedestrian mathematical models from occupant mathematical models, which were in turn developed from cadaver and dummy tests. It is hoped that future research will result in improved thoracic biofidelity in human mathematical models.
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Earls, Craig P. "Holographic particle image velocimetry : computational simulation and reconstruction." Thesis, Springfield, Va. : Available from National Technical Information Service, 1999. http://handle.dtic.mil/100.2/ADA372219.

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Thesis (Degree of Naval Engineer and M.S. in Aerospace Engineering) Massachusetts Institute of Technology, June 1999.
"June 1999". Includes bibliographical references (leaves 77-79). Also available online.
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Earls, Craig P. (Craig Paul) 1967. "Holographic particle image velocimetry : computational simulation and reconstruction." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/80189.

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Thesis (Nav.E.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1999.
Includes bibliographical references (leaves 78-80).
by Craig P. Earls.
S.M.
Nav.E.
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Desai, Amresh S. "Array-based GPR SAR simulation and image reconstruction." Master's thesis, University of Cape Town, 2002. http://hdl.handle.net/11427/7397.

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Bibliography: leaves 53-55.
Subsurface object detection has mainly been carried out using conventional ground penetrating radar (OPR) techniques, which use a single receiving antenna from which a number of range profiles (known as ""A Scope"" images) are assembled to form a two-dimensional data field (known as a ""B Scope"" image). These OPR systems have difficulties with high clutter level, surface reflections, limited ground penetration and the required fine resolution. The resolution in the across track and along track directions is limited by the physical aperture in these directions. This project aims at developing a SAR imaging technique, which uses a single transmitting/receiving antenna to synthesize a two-dimensional planar aperture. Thus a three-dimensional reflectivity image of a scene is generated. The resolution in the across track and along track directions is achieved via a SAR aperture synthesis technique. The depth/range resolution is achieved via the transmission of narrowband Stepped Frequency Continuous Wave (SFCW) signals.
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Huynh, Minh Duc. "Reconstruction Volumique de Résultats de Simulation à Base Chimère." Thesis, Pau, 2012. http://www.theses.fr/2012PAUU3051/document.

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La simulation numérique des écoulements est une étape essentielle de la conception des turbines à gaz équipant les hélicoptères. La recherche permanente de la performance a conduit à des géométries de turbines très complexes et il devient de plus en plus difficile de modéliser des grilles de simulation qui épousent parfaitement la CAO des moteurs. La technique chimère permet de s’affranchir des contraintes de recollement parfait des différentes grilles en autorisant leur chevauchement. Cependant elle soulève de nouveaux problèmes lors de la phase de post-traitement, lorsqu’il s’agit d’exploiter les résultats de simulation afin de faire de nouveaux calculs ou de les visualiser, parce que les outils usuels ne sont pas adaptés à ces configurations particulières. Dans le cadre des deux premiers projets du programme MOSART du pôle de compétitivité Aerospace Valley, respectivement MACAO et OSMOSES, nous avons travaillé en collaboration avec l’entreprise Turbomeca à la conception d’une méthode de reconstruction volumique afin de traiter les résultats de simulations à base chimère. Nous avons ainsi proposé une méthode innovante permettant de reconstruire une partition de l’espace de simulation exempte de chevauchement entre grilles. La nouvelle partition conserve le maximum de propriétés des grilles d’origine et assure en tout point la conformité aux bords. La complexité théorique est linéaire avec la taille des grilles d’origine et nous permet d’obtenir des temps de traitement de l’ordre de la seconde pour des grilles de plusieurs centaines de milliers de mailles. Le principal intérêt de ce travail est de rendre exploitables les résultats de simulations à base chimère par les outils de post-traitement, qu’il s’agisse d’outils maison ou des nombreux logiciels commerciaux ou OpenSource disponibles, condition indispensable pour l’adoption de la méthode chimère par les bureaux d’études
Computationnal fluid dynamics is an essential step in gas turbine modelling. Continuous optimization of turbines has led to sophisticated geometries, which raises severe issues for the design of adapted simulation grids. The chimera technique aims at relaxing geometry matching constraints by allowing grids overlap. However, post-processing of simulation results performed over chimera grids raises new issues because usual tools are not tuned for this particular geometricconfigurations. In the framework of the MOSART programme of the world competitiveness cluster Aerospace Valley, we have been working in collaboration with Turbomeca in order to develop a technique for the volumetric reconstruction of chimerasimulation results. We propose an innovative method that allows us to build a collection of non-overlapping grids while preserving the main properties of the former simulation grids and featuring boundary conforming property everywhere.The theorical complexity of our algorithms has proved to be linear in the size of the former grids and leads to computation times of a few seconds for grids of hundreds of thousands of cells. The main impact of this work leads in the possibility of using any post-processing tool, including a large number of OpenSource solutions, for post-processing chimera simulation results, which is a mandatory condition for the wide acceptance of this method by industry actors
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Yang, Kuan. "Ancestral Genome Reconstruction in Bacteria." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/28091.

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The rapid accumulation of numerous sequenced genomes has provided a golden opportunity for ancestral state reconstruction studies, especially in the whole genome reconstruction area. However, most ancestral genome reconstruction methods developed so far only focus on gene or replicon sequences instead of whole genomes. They rely largely on either detailed modeling of evolutionary events or edit distance computation, both of which can be computationally prohibitive for large data sets. Hence, most of these methods can only be applied to a small number of features and species. In this dissertation, we describe the design, implementation, and evaluation of an ancestral genome reconstruction system (REGEN) for bacteria. It is the first bacterial genome reconstruction tool that focuses on ancestral state reconstruction at the genome scale instead of the gene scale. It not only reconstructs ancestral gene content and contiguous gene runs using either a maximum parsimony or a maximum likelihood criterion but also replicon structures of each ancestor. Based on the reconstructed genomes, it can infer all major events at both the gene scale, such as insertion, deletion, and translocation, and the replicon scale, such as replicon gain, loss, and merge. REGEN finishes by producing a visual representation of the entire evolutionary history of all genomes in the study. With a model-free reconstruction method at its core, the computational requirement for ancestral genome reconstruction is reduced sufficiently for the tool to be applied to large data sets with dozens of genomes and thousands of features. To achieve as accurate a reconstruction as possible, we also develop a homologous gene family prediction tool for preprocessing. Furthermore, we build our in-house Prokaryote Genome Evolution simulator (PEGsim) for evaluation purposes. The homologous gene family prediction refinement module can refine homologous gene family predictions generated by third party de novo prediction programs by combining phylogeny and local gene synteny. We show that such refinement can be accomplished for up to 80% of homologous gene family predictions with ambiguity (mixed families). The genome evolution simulator, PEGsim, is the first random events based high level bacteria genome evolution simulator with models for all common evolutionary events at the gene, replicon, and genome scales. The concepts of conserved gene runs and horizontal gene transfer (HGT) are also built in. We show the validation of PEGsim itself and the evaluation of the last reconstruction component with simulated data produced by it. REGEN, REconstruction of GENomes, is an ancestral genome reconstruction tool based on the concept of neighboring gene pairs (NGPs). Although it does not cover the reconstruction of actual nucleotide sequences, it is capable of reconstructing gene content, contiguous genes runs, and replicon structure of each ancestor using either a maximum parsimony or a maximum likelihood criterion. Based on the reconstructed genomes, it can infer all major events at both the gene scale, such as insertion, deletion, and translocation, and the replicon scale, such as replicon gain, loss, and merge. REGEN finishes by producing a visual representation of the entire evolutionary history of all genomes in the study.
Ph. D.
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Chang, Ka Kit. "Human model reconstruction from image sequence /." View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?MECH%202003%20CHANG.

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Thesis (Ph. D.)--Hong Kong University of Science and Technology, 2003.
Includes bibliographical references (leaves 124-134). Also available in electronic version. Access restricted to campus users.
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Talukdar, Saifulla. "Ekofisk Chalk: Core Measurements, Stochastic Reconstruction, Network Modeling and Simulation." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, 2002. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-120.

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This dissertation deals with (1) experimental measurements on petrophysical reservoir engineering and morphological properties of Ekofisk chalk, (2) numerical simulation of core flood experiments to analyze and improve relative permeability data, (3) stochastic reconstruction of chalk samples from limited morphological information, (4) extraction of pore space parameters from the reconstructed samples, development of network model using pore space information, and computation of petrophysical and reservoir engineering properties from network model, and (5) development of 2D and 3D idealized fractured reservoir models and verification of the applicability of several widely used conventional upscaling techniques in fractured reservoir simulation.

Experiments have been conducted on eight Ekofisk chalk samples and porosity, absolute permeability, formation factor, and oil-water relative permeability, capillary pressure and resistivity index are measured at laboratory conditions. Mercury porosimetry data and backscatter scanning electron microscope images have also been acquired for the samples.

A numerical simulation technique involving history matching of the production profits is employed to improve the relative permeability curves and to analyze hysteresis of the Ekofisk chalk sample. The technique was found to be a powerful tool to supplement the uncertainties in experimental measurements.

Porosity and correlation statistics obtained from backscatter scanning electron microscope image are used to reconstruct microstructures of chalk and particulate media. The reconstruction technique involves a simulated annealing algorithm, which can be constrained by an arbitrary number of morphological parameters. This flexibility of the algorithm is exploited to successfully reconstruct particulate media and chalk samples using more that one correlation function. A technique based on conditional simulated annealing has been introduced for exact reproduction of vuggy porosity in chalk in the form of foraminifer shells. A hybrid reconstruction technique that initialized the simulated annealing reconstruction with input generated using the Gaussian random field model has also been introduced. The technique was found to accelerate significantly the rate of convergence of the simulated annealing method. This finding is important because the main advantage of the simulated annealing method, namely its ability to impose a variety of reconstruction constraints, is usually compromised by its very slow rate of convergence.

Absolutely permeability, formation factor and mercury-air capillary pressure are computed from simple network models. The input parameters for the network models were extracted from a reconstructed chalk sample. The computed permeability, formation factor and mercury-air capillary pressure correspond well with the experimental data. The predictive power of a network model for chalk is further extended through incorporating important pore-level displacement phenomena and realistic description of pore space geometry and topology. Limited results show that the model may be used to compute absolute and relative permeabilities, capillary pressure, formation factor, resistivity index and saturation exponent. The above findings suggest that the network modeling technique may be used for prediction of petrophysical and reservoir engineering properties of chalk. Further works are necessary and an outline is given with considerable details.

Two 2D, one 3D and a dual-porosity fractured reservoir models have been developed and an imbibition process involving water displacing oil is simulated at various injection rates and with different oil-to-water viscosity ratios using four widely used conventional upscaling techniques. The upscaling techniques are the Kyte & Berry, Pore Volume Weighted, Weighed Relative Permeability, and Stone. The results suggest that the upscaling of fractured reservoirs may be possible using the conventional techniques. Kyte & Berry technique was found to be the most effective in all situations. However, further investigations are necessary using realistic description of fracture length, orientation, connectivity, aperture, spacing, etc.


Paper 3,4 and 5 reprinted with kind persmission of Elsevier Science, Science Direct.
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Grandi, Massimiliano <1970&gt. "Microwave Breast Cancer Imaging: Simulation, Experimental Data, Reconstruction and Classification." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/7276/1/GRANDI_MASSIMILIANO_TESI.pdf.

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This work concerns the microwave imaging (MWI) for breast cancer. The full process to develop an experimental phantom is detailed. The models used in the simulation stage are presented in an increasing complexity. Starting from a simplified homogeneous breast where only the tumor is placed in a background medium, moving to an intermediate complexity model where a rugged fibroglandular structure other than tumor has been placed and reaching a realistic breast model derived from the nuclear magnetic resonance phantoms. The reconstruction is performed in 2D using the linear TR-MUSIC algorithm tested in the monostatic and multistatic approaches. The description of the developed phantom and the instruments involved are detailed along with the already planned improvements. The simulated and experimental results are compared. Finally a classification stage based on the leading technique known as “deep learning”, an improved branch of the machine learning, is adopted using mammographic images.
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Yue, Jinlong. "L'élastographie par résonance magnétique et l'élastographie ultrasonore par ondes de cisaillement supersonic : simulation, comparaison expérimentale et l'application pour la caractérisation du foie." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS483/document.

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L’élastographie est une modalité d'imagerie médicale émergente qui permet de mesurer les propriétés mécaniques des tissus moux humains. Ces mesures peuvent servir de biomarqueurs pour l'amélioration de la prise en charge des maladies, du diagnostic précoce et de l'évaluation de la sévérité, au suivi de la réponse au traitement. Parmi les différentes approches de l’élastographie, l'élastographie par Résonance Magnétique (ERM) et l’élastographie ultrasonore par ondes de cisaillement (Supersonic Shear Imaging (SSI)) suscitent des intérêts particuliers. Ces deux modalités ont été largement étudiées pour des applications cliniques multiples. Toutefois, chaque modalité repose sur des conditions d'acquisition et de reconstruction différentes et caractérisées par leur propres limites qui peuvent induire des biais de mesure intra-et inter-modalité et donc entraver l'interchangeabilité des deux modalités pour des applications cliniques. Dans un premier temps, ma thèse a porté sur l'identification des biais de mesure entre ERM et SSI. Grâce à une comparaison méthodologique approfondie des deux modalités, nous avons identifié les différentes caractéristiques de fréquence des ondes de cisaillement générées par les deux modalités et les contraintes spécifiques de reconstruction, en particulier en ERM, comme les principales sources de biais de mesure entre les deux modalités. Dans un deuxième temps, une étude de simulation a étéeffectuée afin de caractériser l'influence des conditions d'acquisition et de reconstruction sur l'exactitude et la précision des mesures d’ERM. Nous avons établi des abaci in silico pour identifier le nombre de voxels par longueur d'onde idéal (rapport λ/a) pour obtenir des mesures ERM exactes et précises. En outre, nous avons montré que le rééchantillonnage pouvait s’avérer efficace afin de répondre aux critères de λ/a favorable lorsque le nombre de voxels par longueur d'onde initial était mal défini. Les résultats finaux, qui sont généralement calculés à partir des trois directions d'encodage, peuvent être améliorés grâce à des stratégies de pondération appropriées qui reposent sur le champ rotationnel du déplacement de l'onde de cisaillement. Pour la modalité SSI, nous avons utilisé le paramètre de qualité fourni par le fabricant afin d’éliminer raisonnablement des résultats peu fiables et améliorer encore la qualité des mesures. Ensuite nous avons intégré les stratégies d'optimisation proposées dans chaque modalité pour effectuer des études de comparaison expérimentales impartiales entre ces deux modalités. Des études in vitro ont été effectuées sur des fantômes commerciaux calibrés et aussi des fantômes à la base de l'alcool polyvinylique. Des résultats expérimentaux confirment bien ceux de la simulation. Des mesures SSI et ERM sont en bon accord quand des biais reliés à la théorie, l'expérimentation et la reconstruction sont minimisés. Des études in vivo ont été ensuite effectuées sur le foie de deux volontaires sains. On a constaté que lorsque le foie est quasi-élastique, des mesures SSI et ERM avec la qualité optimisée concordent bien les uns et les autres, ils sont donc interchangeables. Dans le cas du tissu hépatique viscoélastique, des mesures SSI et ERM dépendent de la fréquence. Dans ce contexte, des mesures ERM et SSI pour la même fréquence spécifique sont nécessaires pour réaliser une comparaison impartiale entre des deux modalités
Elastography is an emerging medical imaging modality which permits to measure the mechanical properties of human soft tissue. The measured mechanical properties can serve as potential biomarkers for improving the management of diseases, from early diagnosis, to severity evaluation and therapy response monitoring. Among different approaches, Magnetic Resonance Elastography (MRE) and Supersonic Shear Imaging (SSI) have shown particular interests. The two modalities have been widely investigated for multiple clinical applications. However, each modality is challenged by specific acquisition and reconstruction conditions which may induce intra- and inter-modality measurement biases and hence impede the interchangeability of the two modalities. The first part of my thesis focused on identifying the measurement biases between MRE and SSI. Through a thorough methodological comparison study, we recognized different frequency characteristics of generated shear waves for the two modalities and modality specific reconstruction validity issues as the main sources for the measurement biases between the two modalities. Then through a dedicated simulation study, we established an in silico abaci to identify the favorable range of number of voxels per wavelength which leads to accurate and precise MRE. Moreover, resampling was proven effective to regulate poorly defined number of voxels per wavelength to the favorable range. The overall outcome, which is usually computed from the three acquired motionencoded directions, may further be improved by appropriate weighting strategies that are based on curl of shear displacement field. For SSI, we referred to the quality parameter provided by the manufacturer to reasonably eliminate unreliable results so as to further improve the measurement quality. After establishing the potential measurement biases between MRE and SSI, we incorporated the proposed quality optimization strategies into both modalities in order to perform unbiased experimental comparison studies between the two modalities. First, in vitro studies were carried out on commercial calibrated phantoms as well as home-made polyvinyl alcohol phantoms. Experimental results corroborate well the simulation findings. MRE and SSI measurements agree well witheach other when theory, experiment, and reconstruction biases are minimized. In vivo studies were then performed on the livers of two healthy volunteers. We found that when the liver is quasi-elastic, the quality-guided MRE and SSI measurements agree well with each other and hence are interchangeable. In case of viscoelastic liver tissue, both MRE and SSI measurements are frequency dependent. Thus frequency-specific measurements are essential for cross-validating the measurements of these two modalities
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Books on the topic "Simulation and reconstruction"

1

Mahdi, Abdelguerfi, ed. 3D synthetic environment reconstruction. Boston: Kluwer Academic Publishers, 2001.

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Earls, Craig P. Holographic particle image velocimetry: Computational simulation and reconstruction. Springfield, Va: Available from National Technical Information Service, 1999.

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Abdelguerfi, Mahdi. 3D Synthetic Environment Reconstruction. Boston, MA: Springer US, 2001.

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Maybank, Stephen. Theory of Reconstruction from Image Motion. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993.

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Matthew, Brach R., ed. Vehicle accident analysis and reconstruction methods. 2nd ed. Warrendale, Pa: SAE International, 2011.

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Saul, R. A. Component head test accident reconstruction feasibility analysis. Washington, D.C: U.S. Dept. of Transportation, National Highway Traffic Safety Administration, 1986.

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Pu, Shi. Knowledge based building facade reconstruction from laser point clouds and images. Delft: Netherlands Geodetic Commission, 2010.

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Shah, Tahir Rabbani. Automatic reconstruction of industrial installations using point clouds and images. Delft: Nederlandse Commissie voor Geodesie, 2006.

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(Korea), Kŏnʼguk Taehakkyo, ed. Chŏntʻong kwahak kigi ŭi pogwŏn kisul kaebal =: Technical development on the reconstruction of traditional scientific instruments. [Seoul]: Kwahak Kisulchʻŏ, 1995.

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Elberink, Sander Oude. Acquisition of 3D topography: Automated 3D road and building reconstruction using airborne laser scanner data and topographic maps. Delft: NCG, Netherlands Geodetic Commission, 2010.

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Book chapters on the topic "Simulation and reconstruction"

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Grohsjean, Alexander. "Event Reconstruction and Simulation." In Springer Theses, 17–31. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-14070-9_3.

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Caillol, Cécile. "Event Generation, Simulation and Reconstruction." In Springer Theses, 71–84. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-70650-4_5.

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Mistry, Krishan V. J. "Simulation and Reconstruction in MicroBooNE." In Exploring Electron–Neutrino–Argon Interactions, 79–97. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-19572-3_6.

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Sundaraj, Kenneth, Christian Laugier, and François Boux-de-Casson. "Towards a Complete Intra-operative CT-Free Navigation System for Anterior Cruciate Ligament Reconstruction." In Medical Simulation, 277–86. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-25968-8_31.

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Apostolakis, John. "The Geant4 Simulation Toolkit and Applications." In Molecular Imaging: Computer Reconstruction and Practice, 73–92. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-8752-3_5.

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Russo, Paolo. "Simulation of Detectors for Biomedical Imaging." In Molecular Imaging: Computer Reconstruction and Practice, 145–60. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-8752-3_8.

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Giani, Simone. "Physics Simulation Software Foundations, Methodology and Functionality." In Molecular Imaging: Computer Reconstruction and Practice, 19–37. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-8752-3_3.

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Roth, Camille. "Reconstruction Failures: Questioning Level Design." In Epistemological Aspects of Computer Simulation in the Social Sciences, 89–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-01109-2_7.

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Wang, Chao, and Yubo Fan. "Modeling and Simulation of Bone Reconstruction Process." In Biomechanical Modelling and Simulation on Musculoskeletal System, 345–52. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-3911-1_6.

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Mlekus, R., Ch Ledl, E. Strasser, and S. Selberherr. "Polygonal Geometry Reconstruction after Cellular Etching or Deposition Simulation." In Simulation of Semiconductor Devices and Processes, 50–53. Vienna: Springer Vienna, 1995. http://dx.doi.org/10.1007/978-3-7091-6619-2_11.

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Conference papers on the topic "Simulation and reconstruction"

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Bruzzone, A. G., and M. Massei. "Intelligent Agents for Modelling Country Reconstruction Operation." In Modelling and Simulation. Calgary,AB,Canada: ACTAPRESS, 2010. http://dx.doi.org/10.2316/p.2010.685-052.

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Aggarwal, Hemant K., Angshul Majumdar, and Rabab Ward. "A Reconstruction Algorithm for Multi-Spectral Image Demosaicing." In Modelling and Simulation. Calgary,AB,Canada: ACTAPRESS, 2013. http://dx.doi.org/10.2316/p.2013.804-052.

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Tinati, M. A., and T. Yousefi Rezaii. "Adaptive sparsity-aware parameter vector reconstruction with application to compressed sensing." In Simulation (HPCS). IEEE, 2011. http://dx.doi.org/10.1109/hpcsim.2011.5999845.

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Riker, Jim F., Glenn A. Tyler, and Jeffrey L. Vaughn. "Long-range speckle imaging theory, simulation, and brassboard results." In Unconventional and Indirect Imaging, Image Reconstruction, and Wavefront Sensing 2017, edited by Jean J. Dolne and Rick P. Millane. SPIE, 2017. http://dx.doi.org/10.1117/12.2276429.

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Piani, S., W. Lei, L. Heltai, N. Rotundo, and P. Farrell. "Data-driven doping reconstruction." In 2022 International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD). IEEE, 2022. http://dx.doi.org/10.1109/nusod54938.2022.9894774.

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Park, Sung-won. "Spectrum Reconstruction from Recurrent Nonuniform Sampling with Known Nonuniform Sampling Ratios." In Modelling and Simulation. Calgary,AB,Canada: ACTAPRESS, 2013. http://dx.doi.org/10.2316/p.2013.804-036.

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Lu, Xin-Long, Shengyong Chen, Xin Wang, Sheng Liu, Chunyan Yao, and Xianping Huan. "Image Super-Resolution Reconstruction Using Map Estimation." In 27th Conference on Modelling and Simulation. ECMS, 2013. http://dx.doi.org/10.7148/2013-0838.

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Chukalina, Marina, Anastasia Ingacheva, Alexey Buzmakov, Igor Polyakov, Andrey Gladkov, Ivan Yakimchuk, and Dmitry P. Nikolaev. "Automatic Beam Hardening Correction For CT Reconstruction." In 31st Conference on Modelling and Simulation. ECMS, 2017. http://dx.doi.org/10.7148/2017-0270.

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Kostorz, Wawrzyniec, Ann Muggeridge, Matthew Jackson, and Arthur Moncorge. "Non-Intrusive Reduced Order Modelling for Reconstruction of Saturation Distributions." In SPE Reservoir Simulation Conference. Society of Petroleum Engineers, 2019. http://dx.doi.org/10.2118/193831-ms.

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Guha, Avishek, and Ingmar Schoegl. "Limited View Tomography of Combustion Zones Using Tunable Diode Laser Absorption Spectroscopy: Simulation of an Algebraic Reconstruction Technique." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-89507.

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Temperature and concentration distributions of a simulated flame were reconstructed with the help of computer tomography and tunable diode laser absorption spectroscopy (TDLAS). Reconstructions were based on the simulated numerical values of temperature and concentration of a stationary flame. Integrated absorption measurements along the line-of-sight (LOS) across the flames due to absorption by water vapor (H2O) in the near infra-red (NIR) region, specifically the 6930–6940 cm−1 range, were simulated to obtain the projection values for tomography. Spectroscopic parameters for the absorptions transitions, such as line-strengths, transition wavenumbers, collisional broadening coefficients and coefficients for their temperature dependency were selected from the HITRAN 2004 database. Simulated LOS data are inverted using a multiplicative algebraic reconstruction technique (MART), which are known to outperform traditional filtered back projection methods for cases with limited numbers of views. Based on spatially resolved reconstructions of spectroscopic data, temperature and concentration distributions are calculated using the wavelength modulation spectroscopy with second harmonic detection (WMS-2f) technique. A parametric study based on the number of views, orientation of views and number of rays per view required by the ART is performed in order to assess requirements for an acceptable reconstruction.
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Reports on the topic "Simulation and reconstruction"

1

Chambers, David H. Polarimetric ISAR: Simulation and image reconstruction. Office of Scientific and Technical Information (OSTI), March 2016. http://dx.doi.org/10.2172/1247281.

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Shaw, Kevin, Mahdi Abdelguerfi, Edgar Cooper, Christ Wynne, and Barbara Ray. Virtual World Reconstruction Using the Modeling and Simulation Extended Vector Product Prototype. Fort Belvoir, VA: Defense Technical Information Center, May 1997. http://dx.doi.org/10.21236/ada327837.

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Castiglioni, Whitmaur, Alex Himmel, and Bryan Ramson. Simulation Studies Of Photon Signal Reconstruction In The DUNE Single Phase Far Detector With Xe Doping. Office of Scientific and Technical Information (OSTI), August 2019. http://dx.doi.org/10.2172/1614720.

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Torres, Marissa, Norberto Nadal-Caraballo, and Alexandros Taflanidis. Rapid tidal reconstruction for the Coastal Hazards System and StormSim part II : Puerto Rico and U.S. Virgin Islands. Engineer Research and Development Center (U.S.), August 2021. http://dx.doi.org/10.21079/11681/41482.

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This Coastal and Hydraulics Engineering Technical Note (CHETN) describes the continuing efforts towards incorporating rapid tidal time-series reconstruction and prediction capabilities into the Coastal Hazards System (CHS) and the Stochastic Storm Simulation System (StormSim). The CHS (Nadal-Caraballo et al. 2020) is a national effort for the quantification of coastal storm hazards, including a database and web tool (https://chs.erdc.dren.mil) for the deployment of results from the Probabilistic Coastal Hazard Analysis (PCHA) framework. These PCHA products are developed from regional studies such as the North Atlantic Coast Comprehensive Study (NACCS) (Nadal-Caraballo et al. 2015; Cialone et al. 2015) and the ongoing South Atlantic Coast Study (SACS). The PCHA framework considers hazards due to both tropical and extratropical cyclones, depending on the storm climatology of the region of interest. The CHS supports feasibility studies, probabilistic design of coastal structures, and flood risk management for coastal communities and critical infrastructure. StormSim (https://stormsim.erdc.dren.mil) is a suite of tools used for statistical analysis and probabilistic modeling of historical and synthetic storms and for stochastic design and other engineering applications. One of these tools, the Coastal Hazards Rapid Prediction System (CHRPS) (Torres et al. 2020), can perform rapid prediction of coastal storm hazards, including real-time hurricane-induced flooding. This CHETN discusses the quantification and validation of the Advanced Circulation (ADCIRC) tidal constituent database (Szpilka et al. 2016) and the tidal reconstruction program Unified Tidal analysis (UTide) (Codiga 2011) in the Puerto Rico and U.S. Virgin Islands (PR/USVI) coastal regions. The new methodology discussed herein will be further developed into the Rapid Tidal Reconstruction (RTR) tool within the StormSim and CHS frameworks.
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Martz, H. E., M. B. Aufderheide, D. Goodman, A. Schach von Wittenau, C. Logan, J. Hall, J. Jackson, and D. Slone. Quantitative tomography simulations and reconstruction algorithms. Office of Scientific and Technical Information (OSTI), November 2000. http://dx.doi.org/10.2172/15005122.

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Aufderheide, M. B., H. E. Martz, D. M. Slone, J. A. Jackson, A. E. Schach von Wittenau, D. M. Goodman, C. M. Logan, and J. M. Hall. Concluding Report: Quantitative Tomography Simulations and Reconstruction Algorithms. Office of Scientific and Technical Information (OSTI), February 2002. http://dx.doi.org/10.2172/15002511.

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Monnig, C. A., K. A. Marshall, G. D. Rayson, and G. M. Hieftje. Tomographic Image Reconstruction Techniques for Spectroscopic Sources: Theory and Computer Simulations. Fort Belvoir, VA: Defense Technical Information Center, July 1988. http://dx.doi.org/10.21236/ada198213.

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Klasky, Marc, Balasubramanya Nadiga, Jennifer Disterhaupt, Trevor Wilcox, Luke Hovey, Theodore Mockler, Christopher Fryer, et al. Uncertainties in Density and Simulation Parameters for Radiographic Reconstructions Using Machine Learning. Office of Scientific and Technical Information (OSTI), June 2020. http://dx.doi.org/10.2172/1632660.

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Torres, Marissa, and Norberto Nadal-Caraballo. Rapid tidal reconstruction with UTide and the ADCIRC tidal database. Engineer Research and Development Center (U.S.), August 2021. http://dx.doi.org/10.21079/11681/41503.

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The quantification of storm surge is vital for flood hazard assessment in communities affected by coastal storms. The astronomical tide is an integral component of the total still water level needed for accurate storm surge estimates. Coastal hazard analysis methods, such as the Coastal Hazards System and the StormSim Coastal Hazards Rapid Prediction System, require thousands of hydrodynamic and wave simulations that are computationally expensive. In some regions, the inclusion of astronomical tides is neglected in the hydrodynamics and tides are instead incorporated within the probabilistic framework. There is a need for a rapid, reliable, and accurate tide prediction methodology to provide spatially dense reconstructed or predicted tidal time series for historical, synthetic, and forecasted hurricane scenarios. A methodology is proposed to combine the tidal harmonic information from the spatially dense Advanced Circulation hydrodynamic model tidal database with a rapid tidal reconstruction and prediction program. In this study, the Unified Tidal Analysis program was paired with results from the tidal database. This methodology will produce reconstructed (i.e., historical) and predicted tidal heights for coastal locations along the United States eastern seaboard and beyond and will contribute to the determination of accurate still water levels in coastal hazard analysis methods.
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Ronan, M. T. W-boson reconstruction in full Monte Carlo detector simulations of 500 GeV e{sup +}e{sup {minus}} collisions. Office of Scientific and Technical Information (OSTI), March 2000. http://dx.doi.org/10.2172/753315.

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