Дисертації з теми "Visualization modeling"
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1
Leszczynski, Zigmond V. "Modeling, simulation and visualization of aerocapture." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1998. http://handle.dtic.mil/100.2/ADA358932.
Повний текст джерелаАнотація:
Thesis (M.S. in Astronautical Engineering) Naval Postgraduate School, December 1998."December 1998." Thesis advisor(s): I. Michael Ross. Includes bibliographical references (p. 85-87). Also available online.
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Frank, Tobias. "Advanced visualization and modeling of tetrahedral meshes." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2009. http://nbn-resolving.de/urn:nbn:de:swb:105-0716552.
Повний текст джерелаАнотація:
Tetrahedral meshes are becoming more and more important for geo-modeling applications. The presented work introduces new algorithms for efficient visualization and modeling of tetrahedral meshes. Visualization consists of a generic framework that includes the extraction of geological information like stratigraphic columns, fault block boundaries, simultaneous co-rendering of different attributes and boolean operations of Constructive Solid Geometry with constant complexity. Modeling can be classified into geometric and implicit modeling. Geometric modeling addresses local mesh refinement to increase the numerical resolution of a given mesh. Implicit modeling covers the definition and manipulation of implicitly defined models. A new surface reconstruction method was developed to reconstruct complex, multi-valued surfaces from noisy and sparse data sets as they occur in geological applications. The surface can be bounded and may have discontinuities. Further, this work proposes a new and innovative algorithm for rapid editing of implicitly defined shapes like horizons based on the GeoChron parametrization. The editing is performed interactively on the 3d-volumetric model and geological constraints are respected automatically.
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Kim, Seungyeon. "Modeling and visualization of version-controlled documents." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/39603.
Повний текст джерелаАнотація:
Version-controlled documents, such as Wikipedia or program codes in Subversion, demands a novel methodology to be analyzed efficiently. The documents are continually edited by one or more authors in contrast of the case of static documents. These collaborative processses make traditional methodologies to be ineffective, yet needs for efficient methodologies are rapidly developing. This paper proposes two new models based on Local Space-time Smoothing (LSS) which captures important revision patterns while Cumulative Revision Map (CRM) tracks word insertions and deletions in particular positions of a document. These two methods enable us to understand and visualize the revision patterns intuitively and efficiently. Synthetic data and real-world data are used to demonstrate its applicability.
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Holliday, Timothy M. "Real-time 3D sonar modeling and visualization." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1998. http://handle.dtic.mil/100.2/ADA350893.
Повний текст джерелаАнотація:
Thesis (M.S. in Applied Physics) Naval Postgraduate School, June 1998."June 1998." Thesis advisor(s): Don Brutzman, Kevin B. Smith. Includes bibliographical references (p. 232). Also available online.
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Frank, Tobias Mallet Jean-Laurent. "Advanced visualization and modeling of tetrahedral meshes." Vandoeuvre-les-Nancy : INPL, 2006. http://www.scd.inpl-nancy.fr/theses/2006_FRANK_T.pdf.
Повний текст джерела
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Frank, Tobias. "Advanced visualization and modeling of tetrahedral meshes." Doctoral thesis, Vandoeuvre-les-Nancy, INPL, 2006. https://tubaf.qucosa.de/id/qucosa%3A22536.
Повний текст джерелаАнотація:
Tetrahedral meshes are becoming more and more important for geo-modeling applications. The presented work introduces new algorithms for efficient visualization and modeling of tetrahedral meshes. Visualization consists of a generic framework that includes the extraction of geological information like stratigraphic columns, fault block boundaries, simultaneous co-rendering of different attributes and boolean operations of Constructive Solid Geometry with constant complexity. Modeling can be classified into geometric and implicit modeling. Geometric modeling addresses local mesh refinement to increase the numerical resolution of a given mesh. Implicit modeling covers the definition and manipulation of implicitly defined models. A new surface reconstruction method was developed to reconstruct complex, multi-valued surfaces from noisy and sparse data sets as they occur in geological applications. The surface can be bounded and may have discontinuities. Further, this work proposes a new and innovative algorithm for rapid editing of implicitly defined shapes like horizons based on the GeoChron parametrization. The editing is performed interactively on the 3d-volumetric model and geological constraints are respected automatically.
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Cardoso, Pedro Miguel Tenreiro. "Modeling and visualization of medical anesthesiology acts." Master's thesis, Faculdade de Ciências e Tecnologia, 2013. http://hdl.handle.net/10362/11400.
Повний текст джерелаАнотація:
Dissertação para obtenção do Grau de Mestre em
Engenharia InformáticaIn recent years, medical visualization has evolved from simple 2D images on a light board to 3D computarized images. This move enabled doctors to find better ways of planning surgery and to diagnose patients. Although there is a great variety of 3D medical imaging software, it falls short when dealing with anesthesiology acts. Very little anaesthesia related work has been done. As a consequence, doctors and medical students have had little support to study the subject of anesthesia in the human body. We all are aware of how costly can be setting medical experiments, covering not just medical aspects but ethical and financial ones as well. With this work we hope to contribute for having better medical visualization tools in the area of anesthesiology. Doctors and in particular medical students should study anesthesiology acts more efficiently. They should be able to identify better locations to administrate the anesthesia, to study how long does it take for the anesthesia to affect patients, to relate the effect on patients with quantity of anaesthesia provided, etc. In this work, we present a medical visualization prototype with three main functionalities: image pre-processing, segmentation and rendering. The image pre-processing is mainly used to remove noise from images, which were obtained via imaging scanners. In the segmentation stage it is possible to identify relevant anatomical structures using proper segmentation algorithms. As a proof of concept, we focus our attention in the lumbosacral region of the human body, with data acquired via MRI scanners. The segmentation we provide relies mostly in two algorithms: region growing and level sets. The outcome of the segmentation implies the creation of a 3D model of the anatomical structure under analysis. As for the rendering, the 3D models are visualized using the marching cubes algorithm. The software we have developed also supports time-dependent data. Hence, we could represent the anesthesia flowing in the human body. Unfortunately, we were not able to obtain such type of data for testing. But we have used human lung data to validate this functionality.
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Streit, Alexander. "Encapsulation and abstraction for modeling and visualizing information uncertainty." Queensland University of Technology, 2008. http://eprints.qut.edu.au/16963/.
Повний текст джерелаАнотація:
Information uncertainty is inherent in many real-world problems and adds a layer of complexity to modeling and visualization tasks. This often causes users to ignore uncertainty, especially when it comes to visualization, thereby discarding valuable knowledge. A coherent framework for the modeling and visualization of information uncertainty is needed to address this issue In this work, we have identified four major barriers to the uptake of uncertainty modeling and visualization. Firstly, there are numerous uncertainty modeling tech- niques and users are required to anticipate their uncertainty needs before building their data model. Secondly, parameters of uncertainty tend to be treated at the same level as variables making it easy to introduce avoidable errors. This causes the uncertainty technique to dictate the structure of the data model. Thirdly, propagation of uncertainty information must be manually managed. This requires user expertise, is error prone, and can be tedious. Finally, uncertainty visualization techniques tend to be developed for particular uncertainty types, making them largely incompatible with other forms of uncertainty information. This narrows the choice of visualization techniques and results in a tendency for ad hoc uncertainty visualization. The aim of this thesis is to present an integrated information uncertainty modeling and visualization environment that has the following main features: information and its uncertainty are encapsulated into atomic variables, the propagation of uncertainty is automated, and visual mappings are abstracted from the uncertainty information data type. Spreadsheets have previously been shown to be well suited as an approach to visu- alization. In this thesis, we devise a new paradigm extending the traditional spreadsheet to intrinsically support information uncertainty.Our approach is to design a framework that integrates uncertainty modeling tech- niques into a hierarchical order based on levels of detail. The uncertainty information is encapsulated and treated as a unit allowing users to think of their data model in terms of the variables instead of the uncertainty details. The system is intrinsically aware of the encapsulated uncertainty and is therefore able to automatically select appropriate uncertainty propagation methods. A user-objectives based approach to uncertainty visualization is developed to guide the visual mapping of abstracted uncertainty information. Two main abstractions of uncertainty information are explored for the purpose of visual mapping: the Unified Uncertainty Model and the Dual Uncertainty Model. The Unified Uncertainty Model provides a single view of uncertainty for visual mapping, whereas the Dual Uncertainty Model distinguishes between possibilistic and probabilistic views. Such abstractions provide a buffer between the visual mappings and the uncertainty type of the underly- ing data, enabling the user to change the uncertainty detail without causing the visual- ization to fail. Two main case studies are presented. The first case study covers exploratory and forecasting tasks in a business planning context. The second case study inves- tigates sensitivity analysis for financial decision support. Two minor case studies are also included: one to investigate the relevancy visualization objective applied to busi- ness process specifications, and the second to explore the extensibility of the system through General Purpose Graphics Processor Unit (GPGPU) use. A quantitative anal- ysis compares our approach to traditional analytical and numerical spreadsheet-based approaches. Two surveys were conducted to gain feedback on the from potential users. The significance of this work is that we reduce barriers to uncertainty modeling and visualization in three ways. Users do not need a mathematical understanding of the uncertainty modeling technique to use it; uncertainty information is easily added, changed, or removed at any stage of the process; and uncertainty visualizations can be built independently of the uncertainty modeling technique.
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Santhanam, Anand. "MODELING, SIMULATION, AND VISUALIZATION OF 3D LUNG DYNAMICS." Doctoral diss., University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3824.
Повний текст джерелаАнотація:
Medical simulation has facilitated the understanding of complex biological phenomenon through its inherent explanatory power. It is a critical component for planning clinical interventions and analyzing its effect on a human subject. The success of medical simulation is evidenced by the fact that over one third of all medical schools in the United States augment their teaching curricula using patient simulators. Medical simulators present combat medics and emergency providers with video-based descriptions of patient symptoms along with step-by-step instructions on clinical procedures that alleviate the patient's condition. Recent advances in clinical imaging technology have led to an effective medical visualization by coupling medical simulations with patient-specific anatomical models and their physically and physiologically realistic organ deformation. 3D physically-based deformable lung models obtained from a human subject are tools for representing regional lung structure and function analysis. Static imaging techniques such as Magnetic Resonance Imaging (MRI), Chest x-rays, and Computed Tomography (CT) are conventionally used to estimate the extent of pulmonary disease and to establish available courses for clinical intervention. The predictive accuracy and evaluative strength of the static imaging techniques may be augmented by improved computer technologies and graphical rendering techniques that can transform these static images into dynamic representations of subject specific organ deformations. By creating physically based 3D simulation and visualization, 3D deformable models obtained from subject-specific lung images will better represent lung structure and function. Variations in overall lung deformations may indicate tissue pathologies, thus 3D visualization of functioning lungs may also provide a visual tool to current diagnostic methods. The feasibility of medical visualization using static 3D lungs as an effective tool for endotracheal intubation was previously shown using Augmented Reality (AR) based techniques in one of the several research efforts at the Optical Diagnostics and Applications Laboratory (ODALAB). This research effort also shed light on the potential usage of coupling such medical visualization with dynamic 3D lungs. The purpose of this dissertation is to develop 3D deformable lung models, which are developed from subject-specific high resolution CT data and can be visualized using the AR based environment. A review of the literature illustrates that the techniques for modeling real-time 3D lung dynamics can be roughly grouped into two categories: Geometrically-based and Physically-based. Additional classifications would include considering a 3D lung model as either a volumetric or surface model, modeling the lungs as either a single-compartment or a multi-compartment, modeling either the air-blood interaction or the air-blood-tissue interaction, and considering either a normal or pathophysical behavior of lungs. Validating the simulated lung dynamics is a complex problem and has been previously approached by tracking a set of landmarks on the CT images. An area that needs to be explored is the relationship between the choice of the deformation method for the 3D lung dynamics and its visualization framework. Constraints on the choice of the deformation method and the 3D model resolution arise from the visualization framework. Such constraints of our interest are the real-time requirement and the level of interaction required with the 3D lung models. The work presented here discusses a framework that facilitates a physics-based and physiology-based deformation of a single-compartment surface lung model that maintains the frame-rate requirements of the visualization system. The framework presented here is part of several research efforts at ODALab for developing an AR based medical visualization framework. The framework consists of 3 components, (i) modeling the Pressure-Volume (PV) relation, (ii) modeling the lung deformation using a Green's function based deformation operator, and (iii) optimizing the deformation using state-of-art Graphics Processing Units (GPU). The validation of the results obtained in the first two modeling steps is also discussed for normal human subjects. Disease states such as Pneumothorax and lung tumors are modeled using the proposed deformation method. Additionally, a method to synchronize the instantiations of the deformation across a network is also discussed.Ph.D.
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Computer Science
10
Shikur, H. (Henok). "Assessing modeling and visualization capabilities of modeling tools:limitations and gaps of the open source modeling tools." Master's thesis, University of Oulu, 2015. http://urn.fi/URN:NBN:fi:oulu-201502111072.
Повний текст джерелаАнотація:
Due to the increasing number of Information Communication Technology (ICT) environments, security is becoming a concern for many researchers and organisations. Organisations have implemented different security measures to protect their assets. Different industries—such as power plants and water, oil, and gas utilities—are adapting different network modelling tools for guarding their assets and are preparing for incidents that might occur in the future. Modelling tools are very important for the visualisation of computer networks. There are currently many modelling tools with different modelling and visualisation capabilities for computer networks.
The aim of this research is to make a thorough assessment of the different modelling tools’ capabilities of modelling computer networks and visualising computer network communication. Furthermore, it hopes to show areas for improvement in order to increase the quality of modelling tools based on industry requirements.
The research methodology of this research takes the form of a case study. First, the study analyses previous research in order to illustrate gaps in the literature, as well as identifying the strengths and weaknesses of existing network modelling tools.
The empirical part of the research includes first, studying and evaluating seven open-source modelling tools based on different types of capabilities, this may limit the generalisability of the findings to some extent; and second, selecting four modelling tools for further study. Once four modelling tools were evaluated based on literature reviews and the requirements set in this study, the top two open-source (OSS) modelling tool packages were selected, downloaded, installed, and evaluated further.
The criteria set to evaluate the four modelling tools in this research are based on the requirements provided by the European company nSense, which provides different vulnerability assessments, security consulting, and training, and the existing literature. The evaluation of the tools resulted in the screens that were copied and presented in this document for verification. Finally, the one tool which was the most suitable for further studies, and which fulfilled most of the requirements set in this research, was recommended for further research.
In total, four modelling tools were chosen for the evaluation, using different literature reviews based on the requirements (see Appendix A) in this research. The results showed that the two top modelling tools were OMNeT++ and IMUNES. After practical analysis of these tools, OMNeT++ was found to be the best tool based on the aims and requirements of this research. Further, the study found that usability problems played a large part in evaluating different modelling tools, which might have changed the outcomes of the result. It can therefore be concluded that this type of evaluation is highly dependent on the evaluator’s knowledge and skill, as well as the usability of the tool.
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Mondy, William Lafayette. "Data acquisition for modeling and visualization of vascular tree." [Tampa, Fla] : University of South Florida, 2009. http://purl.fcla.edu/usf/dc/et/SFE0003082.
Повний текст джерела
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Ahanor, David. "Integrated Reservoir Modelling of the Norne Field. : Volume Visualization/Seismic Attribute,Structural and Property Modeling." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for geologi og bergteknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-20379.
Повний текст джерелаАнотація:
ABSTRACT The purpose of this thesis project work is to build reservoir models (structural, facies and Petrophysical property models) of the different reservoir surfaces using integrated data sets (seismic, wells, fault sticks, eclipse models, horizon surfaces) of the Norne field which is located in blocks 6608/10 and 6508/1 in the southern part of the Nordland II area. Different visualizations techniques, volume rendering and seismic attributes were applied to aid the seismic interpretation and to provide detailed evaluation/integration of the data. 3D seismic interpretation for the whole seismic volume within the reservoir section was done manually with controlled input surfaces/reflectors of the Top horizons of the Not and Åre Formations. Fault and surfaces interpretation of the reservoir were generated as key inputs in the modeling process The structural 3D grid skeleton and models were generated with critical inputs of the manually interpreted faults/horizons, using different qualitative/quantitative templates in Petrel. This was followed by well interpretation and upscaling to provide discrete facies which are needed in populating the structural models of each of the reservoir surfaces. A probabilistic facies model was done to capture the proportion of the spatial dimensions of each discrete facies in the model frame. The initiation of this study involves quantitative data quality controls and management of inputs files into the Petrel window, qualitative control involves transferring geologic licenses/understanding to the various interpretations in the visualization schemes, seismic interpretation and reservoir modeling templates. The combination of different data type and idea (volumes, wells, top surfaces, and fault sticks) types means that the user must have a multivariate understanding (Geologic, Geophysical, Petrophysical, Geostastistic, Geo-Modeling and Reservoir Engineering) in other to integrate the data sets and deliver the models. Eleven wells were used in reference to the Top surface of the Not, Åre Top surfaces and Statoil Reference report of the field, to deliver and control the seismic interpretation. A wedge shape structure was observed in the reservoir section. Typically, minor and major faults were interpreted as forming compartments in the reservoir, which were interpreted across the different lines. The structural framework in the field was largely defined by the Norne Horst and associated faults, with the erosional surface of the BCU with internal sub unconformities observed. The property facies model of the reservoir surfaces (Garn, Ile, Tofte, and TIlje) suggest that the Norne Horst and sub relief structures are mainly sand rich, which provides additional prospect indicators in exploring the field
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Meacham, John Marcus. "A Micromachined Ultrasonic Droplet Generator: Design, Fabrication, Visualization, and Modeling." Diss., Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-07072006-103414/.
Повний текст джерелаАнотація:
Thesis (Ph. D.)--Mechanical Engineering, Georgia Institute of Technology, 2007.Mark Papania, MD, Committee Member ; Mark Allen, Committee Member ; Yves Berthelot, Committee Member ; Ari Glezer, Committee Member ; F. Levent Degertekin, Committee Chair ; Andrei G. Fedorov, Committee Chair.
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Jiang, Yaohong. "An interactive 3-D mine modeling, visualization and information system." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0002/NQ31934.pdf.
Повний текст джерела
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Glavatskikh, Marta. "Modeling and visualization of complex chemical data using local descriptors." Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAF008/document.
Повний текст джерелаАнотація:
Cette étude considère des systèmes où non seulement la structure moléculaire, mais les conditions expérimentales sont impliquées. Les structures chimiques ont été codées par des descripteurs locaux ISIDA MA ou ISIDA CGR, ciblant spécifiquement les centres actifs et leur environnement le plus proche. Les descripteurs locaux ont été combinés avec les paramètres spécifiques des conditions expérimentales, codant ainsi un objet chimique particulier. La méthodologie a été appliquée avec succès pour la modélisation QSPR des paramètres thermodynamiques et cinétiques des interactions intermoléculaires (liaisons halogène et hydrogène), des équilibres tautomères et des réactions chimiques (cycloaddition et SN1). La méthode GTM a été appliquée pour la première fois pour la modélisation et la visualisation de données chimiques mixtes. La méthode sépare avec succès les groupes de données à la fois en raison des structures et des conditionsThis work describes original approaches for predictive chemoinformatics modeling of molecular interactions and reactions as a function of the structures of interacting partners and of the chemical environment (experimental conditions). Chemical structures have been encoded by local ISIDA MA-based or CGR-based descriptors, specifically targeting the active centers and their closest environment. The local descriptors have been combined with the specific parameters of experimental conditions, thereby encoding a particular chemical object. The methodology has been successfully applied for QSPR modeling of thermodynamic and kinetic parameters of intermolecular interactions (halogen and hydrogen bonds), tautomeric equilibria and chemical reactions (cycloaddition and SN1). GTM method has been applied for the first time for QSPR modeling and visualization of mixed chemical data. This method successfully separates data clusters on account of both chemical structures and experimental conditions
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Mercier, Corentin. "Geometrical modeling, simplification and visualization of brain white matter tractograms." Electronic Thesis or Diss., Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAT048.
Повний текст джерелаАнотація:
Les données de tractographie (fibres) obtenues à partir d'IRM de diffusion sont difficiles d'utilisation. Dans cette thèse, nous proposons des méthodes et algorithmes pour la simplification, la visualisation et la manipulation de ces données. Nous introduisons une représentation multi-résolution des tractogrammes, plus rapides et avec une meilleure précision géométrique que les approches de simplification existantes. Nous explorons aussi diverses représentations géométriques et nous nous concentrons sur les approches de projections aux moindres carrés (MLS) par l'intermédiaire des surfaces algébriques d'ensemble de points (APSS), pour lesquelles nous réduisons la complexité, permettant l'utilisation de noyaux globaux pour l'analyse et la modélisation. Une technique de segmentation utilisant la représentation multi-résolution et permettant une meilleure reproductibilité que d'autres approches est ensuite présentée. Les tractogrammes pouvant être volumineux, nous introduisons un algorithme de compression exploitant la manière d'obtenir les données à partir des IRM de diffusion. La vitesse de cet algorithme permet même son utilisation pour la visualisation de données compressées, la décompression se faisant à la volée sur le GPU. Ces travaux de recherche et les résultats obtenus se situent à l'intersection de l'informatique graphique et de l'analyse de données médicales, ouvrant de nombreuses perspectivesTractography data (fibers) obtained from diffusion MRI present several challenges.In this thesis, we propose some useful methods and algorithms for simplification, visualization, and manipulation of these data.We introduce a new multi-resolution representation for tractograms, faster, and with higher geometric accuracy than existing simplification approaches.We also investigate various geometric representations and focus on moving least square (MLS) projection with algebraic point set surfaces (APSS), on which we reduce the complexity, allowing for the use of global kernels for analysis and modeling.A segmentation technique using the multi-resolution representation is presented, achieving better reproducibility than other approaches.Tractograms being massive, we also introduce a compression algorithm taking advantage of data obtention from diffusion MRI.The algorithm speed even allows for the direct use of compressed data for visualization, as it can be decompressed on-the-fly on the GPU.This research and the obtained results lie at the intersection between Computer Graphics and Medical Data Analysis, paving the way for numerous perspectives
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Odei, James Beguah. "Statistical Modeling, Exploration, and Visualization of Snow Water Equivalent Data." DigitalCommons@USU, 2014. https://digitalcommons.usu.edu/etd/3871.
Повний текст джерелаАнотація:
Due to a continual increase in the demand for water as well as an ongoing regional drought, there is an imminent need to monitor and forecast water resources in the Western United States. In particular, water resources in the IntermountainWest rely heavily on snow water storage. Thus, the need to improve seasonal forecasts of snowpack and considering new techniques would allow water resources to be more effectively managed throughout the entire water-year. Many available models used in forecasting snow water equivalent (SWE) measurements require delicate calibrations.
In contrast to the physical SWE models most commonly used for forecasting, we offer a statistical model. We present a data-based statistical model that characterizes seasonal snow water equivalent in terms of a nested time-series, with the large scale focusing on the inter-annual periodicity of dominant signals and the small scale accommodating seasonal noise and autocorrelation. This model provides a framework for independently estimating the temporal dynamics of SWE for the various snow telemetry (SNOTEL) sites. We use SNOTEL data from ten stations in Utah over 34 water-years to implement and validate this model.
This dissertation has three main goals: (i) developing a new statistical model to forecast SWE; (ii) bridging existing R packages into a new R package to visualize and explore spatial and spatio-temporal SWE data; and (iii) applying the newly developed R package to SWE data from Utah SNOTEL sites and the Upper Sheep Creek site in Idaho as case studies.
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Stanley, Christopher. "Flood Visualization for Urban Planning : An exploratory spatiotemporal visualization of storm water runoff in 2D and 3D." Thesis, Högskolan i Gävle, Avdelningen för Industriell utveckling, IT och Samhällsbyggnad, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-21822.
Повний текст джерелаАнотація:
Modelling hydrologic processes is important for understanding how the water cycle works in different environments. Cities which undergo constant changes are subject to flood hazards resulting from severe rainfall. This paper aims to simulate severe rainfall, visualize the results, incorporating both spatial and temporal dimensions, and to make future recommendations for further studies on flood visualization. Visualizing the results from a rainfall simulation using GIS provides urban planners and others the means to view the dynamics of the surface runoff. At the same time, it makes accessible advanced querying and analytical tools. A hydrological model for the study area in Gävle, Sweden was used to simulate a 100-year rainfall. Through FME, the data was reduced, time-stamped and combined to a shapefile. Both 2D software, ArcGIS, and 3D software, ArcScene, were used for creating an animated flood visualization. This study shows that although 2D tested better by a group of planners and water professionals, the 3D was still considered more intuitive. The heightened sense of realism from 3D outweighs its drawbacks, and further studies are required to test different methods of 3D visualization.
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Srinivasan, Vinod. "Modeling high-genus surfaces." Texas A&M University, 2004. http://hdl.handle.net/1969.1/316.
Повний текст джерелаАнотація:
The goal of this research is to develop new, interactive methods for creating very high genus 2-manifold meshes. The various approaches investigated in this research can be categorized into two groups -- interactive methods, where the user primarily controls the creation of the high-genus mesh, and automatic methods, where there is minimal user interaction and the program automatically creates the high-genus mesh.
In the interactive category, two different methods have been developed. The first allows the creation of multi-segment, curved handles between two different faces, which can belong to the same mesh or to geometrically distinct meshes. The second method, which is referred to as ``rind modeling'', provides for easy creation of surfaces resembling peeled and punctured rinds.
The automatic category also includes two different methods. The first one automates the process of creating generalized Sierpinski polyhedra, while the second one allows the creation of Menger sponge-type meshes.
Efficient and robust algorithms for these approaches and user-friendly tools for these algorithms have been developed and implemented.
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Cornett, Jeffrey. "DRIVE-BASED MODELING AND VISUALIZATION OF CREW RACE STRATEGY AND PERFORMANCE." Doctoral diss., University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2924.
Повний текст джерелаАнотація:
Crew race strategy is typically formulated by coaches based on rowing tradition and years of experience. However, coaching strategies are not generally supported by empirical evidence and decision-support models. Previous models of crew race strategy have been constrained by the sparse information published on crew race performance (quarterly 500-meter splits). Empirical research has merely summarized which quarterly splits averaged the fastest and slowest relative to the other splits and relative to the average speed of the other competitors. Video records of crew race world championships provide a rich source of data for those capable and patient enough to mine this level of detail. This dissertation is based on a precise frame-by-frame video analysis of five world championship rowing finals. With six competing crews per race, a database of 75 race-pair duels was compiled that summarizes race positioning, competitive drives, and relative stroke rates at 10-meter intervals recorded with photo-finish precision (30 frames per second). The drive-based research pioneered in this dissertation makes several contributions to understanding the dynamics of crew race strategy and performance: 1) An 8-factor conceptual model of crew race performance. 2) A generic drive model that decomposes how pairs of crews duel in a race. 3) Graphical summaries of the rates and locations of successful and unsuccessful drives. 4) Contour lines of the margins that winning crews hold over the course of the race. 5) Trend lines for what constitutes a probabilistically decisive lead as a function of position along the course, seconds behind the leader, and whether the trailing crew is driving. This research defines a new drive-based vocabulary for evaluating crew race performance for use by coaches, competitors and race analysts. The research graphically illustrates situational parameters helpful in formulating race strategy and guiding real-time decision-making by competitors. This research also lays the foundation for future industrial engineering decision-support models and associated parameters as applied to race strategy and tactics.Ph.D.
Department of Industrial Engineering and Management Systems
Engineering and Computer Science
Industrial Engineering PhD
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Heap, Ryan C. "Real-Time Visualization of Finite Element Models Using Surrogate Modeling Methods." BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/6536.
Повний текст джерелаАнотація:
Finite element analysis (FEA) software is used to obtain linear and non-linear solutions to one, two, and three-dimensional (3-D) geometric problems that will see a particular load and constraint case when put into service. Parametric FEA models are commonly used in iterative design processes in order to obtain an optimum model given a set of loads, constraints, objectives, and design parameters to vary. In some instances it is desirable for a designer to obtain some intuition about how changes in design parameters can affect the FEA solution of interest, before simply sending the model through the optimization loop. This could be accomplished by running the FEA on the parametric model for a set of part family members, but this can be very timeconsuming and only gives snapshots of the models real behavior. The purpose of this thesis is to investigate a method of visualizing the FEA solution of the parametric model as design parameters are changed in real-time by approximating the FEA solution using surrogate modeling methods. The tools this research will utilize are parametric FEA modeling, surrogate modeling methods, and visualization methods. A parametric FEA model can be developed that includes mesh morphing algorithms that allow the mesh to change parametrically along with the model geometry. This allows the surrogate models assigned to each individual node to use the nodal solution of multiple finite element analyses as regression points to approximate the FEA solution. The surrogate models can then be mapped to their respective geometric locations in real-time. Solution contours display the results of the FEA calculations and are updated in real-time as the parameters of the design model change.
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Koch, Douglas Spencer. "The Effects of Solid Modeling and Visualization On Technical Problem Solving." Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/27799.
Повний текст джерелаАнотація:
This research was undertaken to investigate the effects of solid modeling and visualization on technical problem solving. The participants were 47 students enrolled in solid modeling classes at Southeast Missouri State University. The control and experimental groups consisted of 23 and 24 randomly assigned students respectively.
This study was a posttest only design that used logistic regression to analyze the results. Both groups were required to take the Purdue Spatial-Visualization Test/Visualization of Rotations (PSVT/TR). Participants in the control group used only sketching to design their solutions while participants in the experimental group used parametric solid modeling software to design their solutions. All participants then constructed prototypes of their designs. The prototype was evaluated to determine if it successfully met the design specifications.
The findings revealed that visualization was a significant predictor of technical problem solving as defined by successful prototype construction (p=.021). There was no significant difference between the sketching and solid modeling design methods used for technical problem solving (p=.752). The interaction between the method of design, solid modeling or sketching, was analyzed to determine if using solid modeling would offset low visualization scores It was found that the interaction was not significant (p=.393).Ph. D.
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Brendel, Conrad. "Analysis, Modeling, and Forecasting Of Urban Flooding." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/105131.
Повний текст джерелаАнотація:
As the world becomes more urbanized and heavy precipitation events increase in frequency and intensity, urban flooding is an emerging concern. Urban flooding is caused when heavy rainfall collects on the landscape, exceeding the capacity of drainage systems to effectively convey runoff. Unlike riverine and coastal flooding, urban flooding occurs frequently, and its risks and impacts are not restricted to areas within floodplains or near bodies of water. The objective of this dissertation is to improve our understanding of urban flooding and our capability to predict it through the development of tools and knowledge to assist with its analysis, modeling, and forecasting.
To do this, three research objectives were fulfilled. First, the Stream Hydrology And Rainfall Knowledge System (SHARKS) app was developed to improve upon existing real-time hydrologic and meteorological data retrieval/visualization platforms through the integration of analysis tools to study the hydrologic processes influencing urban flooding. Next, the ability to simulate the hydrologic response of urban watersheds with large storm sewer networks was compared between the fully distributed Gridded Surface/Subsurface Hydrologic Analysis (GSSHA) model and the semi-distributed Storm Water Management Model (SWMM). Finally, the Probabilistic Urban Flash Flood Information Nexus (PUFFIN) application was created to help users evaluate the probability of urban flash flooding and to identify specific infrastructure components at risk through the integration of high-resolution quantitative precipitation forecasting, ensemble forecasting, and hydrologic and hydraulic modeling.
The outcomes of this dissertation provide municipalities with tools and knowledge to assist them throughout the process of developing solutions to their site-specific urban flooding issues. Specifically, tools are provided to rapidly analyze and respond to rainfall and streamflow/depth information during intense rain events and to perform retrospective analysis of long-term hydrological processes. Evaluations are included to help guide the selection of hydrologic and hydraulic models for modeling urban flooding, and a new proactive paradigm of probabilistic flash flood guidance for urban areas is introduced. Finally, several potential directions for future work are recommended.Doctor of Philosophy
As the world becomes more urbanized and heavy precipitation events increase in frequency and intensity, urban flooding is an emerging concern. Urban flooding is caused when heavy rainfall collects on the landscape, exceeding the capacity of drainage systems to effectively convey runoff. Unlike riverine and coastal flooding, urban flooding occurs frequently, and its risks and impacts are not restricted to areas within floodplains or near bodies of water. The objective of this dissertation is to improve our understanding of urban flooding and our capability to predict it through the development of tools and knowledge to assist with its analysis, modeling, and forecasting. To do this, three research objectives were fulfilled. First, the Stream Hydrology And Rainfall Knowledge System (SHARKS) app was developed to improve upon existing real-time hydrologic and meteorological data retrieval/visualization platforms through the integration of analysis tools to study the hydrologic processes influencing urban flooding. Next, the ability to simulate the hydrologic response of urban watersheds with large storm sewer networks was compared between the fully distributed Gridded Surface/Subsurface Hydrologic Analysis (GSSHA) model and the semi-distributed Storm Water Management Model (SWMM). Finally, the Probabilistic Urban Flash Flood Information Nexus (PUFFIN) application was created to help users evaluate the probability of urban flash flooding and to identify specific infrastructure components at risk through the integration of high-resolution quantitative precipitation forecasting, ensemble forecasting, and hydrologic and hydraulic modeling. The outcomes of this dissertation provide municipalities with tools and knowledge to assist them throughout the process of developing solutions to their site-specific urban flooding issues. Specifically, tools are provided to rapidly analyze and respond to rainfall and streamflow/depth information during intense rain events and to perform retrospective analysis of long-term hydrological processes. Evaluations are included to help guide the selection of hydrologic and hydraulic models for modeling urban flooding, and a new proactive paradigm of probabilistic flash flood guidance for urban areas is introduced. Finally, several potential directions for future work are recommended.
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Indrakanti, Saratchandra. "A Global Stochastic Modeling Framework to Simulate and Visualize Epidemics." Thesis, University of North Texas, 2012. https://digital.library.unt.edu/ark:/67531/metadc115099/.
Повний текст джерелаАнотація:
Epidemics have caused major human and monetary losses through the course of human civilization. It is very important that epidemiologists and public health personnel are prepared to handle an impending infectious disease outbreak. the ever-changing demographics, evolving infrastructural resources of geographic regions, emerging and re-emerging diseases, compel the use of simulation to predict disease dynamics. By the means of simulation, public health personnel and epidemiologists can predict the disease dynamics, population groups at risk and their geographic locations beforehand, so that they are prepared to respond in case of an epidemic outbreak. As a consequence of the large numbers of individuals and inter-personal interactions involved in simulating infectious disease spread in a region such as a county, sizeable amounts of data may be produced that have to be analyzed. Methods to visualize this data would be effective in facilitating people from diverse disciplines understand and analyze the simulation. This thesis proposes a framework to simulate and visualize the spread of an infectious disease in a population of a region such as a county. As real-world populations have a non-homogeneous demographic and spatial distribution, this framework models the spread of an infectious disease based on population of and geographic distance between census blocks; social behavioral parameters for demographic groups. the population is stratified into demographic groups in individual census blocks using census data. Infection spread is modeled by means of local and global contacts generated between groups of population in census blocks. the strength and likelihood of the contacts are based on population, geographic distance and social behavioral parameters of the groups involved. the disease dynamics are represented on a geographic map of the region using a heat map representation, where the intensity of infection is mapped to a color scale. This framework provides a tool for public health personnel and epidemiologists to run what-if analyses on disease spread in specific populations and plan for epidemic response. By the means of demographic stratification of population and incorporation of geographic distance and social behavioral parameters into the modeling of the outbreak, this framework takes into account non-homogeneity in demographic mix and spatial distribution of the population. Generation of contacts per population group instead of individuals contributes to lowering computational overhead. Heat map representation of the intensity of infection provides an intuitive way to visualize the disease dynamics.
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Lu, Ye. "Reconstruction, characterization, modeling and visualization of inherent and induced digital sand microstructures." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37176.
Повний текст джерелаАнотація:
Strain localization, the phenomenon of large shear deformation within thin zones of intensive shearing, commonly occurs both in-situ and in the laboratory tests on soils specimens. The intriguing mechanism of strain localization and how it will affect the general behavior of soil specimens have been investigated by many researchers. Some of the efforts have focused on finding the links between material properties (void space, fabric tensor) and mechanical behavior (stress, strain, volumetric strain). In the last ten years, several extensive studies have been conducted at Georgia Tech to investigate the mechanism of strain localization and link the microstructural properties with the engineering behavior of Ottawa sands. These studies have included 2-D and 3-D characterization of soil microstructures under either triaxial or biaxial shearing conditions. To extend and complement these previous studies, the current study focuses particularly on 3-D reconstruction, analysis and modeling of specimens of Ottawa sand subject to triaxial or biaxial loading. The 3-D microstructure of biaxial specimens was reconstructed using an optical microscopy based montage and serial sectioning technique. Based on the reconstructed 3-D digital volumes, a series of 2-D and 3-D characterizations and analyses, including local void ratio distributions, extent of shear bands, influence of soil fabrics and packing signature effects, were conducted. In addition to the image analysis based reconstruction and characterization, the 3-D discrete element method (DEM) code, PFC3D, was used to explore both biaxial and triaxial shear related soil behaviors at the global and particulate scale. Void ratio distributions, coordination numbers, particle rotations and displacements, contact normal distributions and normal contact forces as well as global stress and strain responses were investigated and analyzed to help understand the mechanism of strain localization. The microstructures of the numerical specimens were also characterized in the same way as the physical specimens and similar strain localization patterns were identified. Combined with the previous related studies, the current study provides new insights into the strain localization phenomenon of Ottawa sands subject to triaxial and biaxial loading. In addition, the reconstructed digital specimens were subject to a series of dissection studies which revealed exciting new insights into "microstructure signatures" which exist at both meso and micro scales within the real and simulated specimens.
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Ouerghi, Nabil. "Modeling airport ground operations using Discrete Event Simulation (DES) and X3D visualization." Thesis, Monterey, Calif. : Naval Postgraduate School, 2008. http://bosun.nps.edu/uhtbin/hyperion-image.exe/08Mar%5FOuerghi.pdf.
Повний текст джерелаАнотація:
Thesis (M.S. in Modeling, Virtual Environments and Simulation (MOVES))--Naval Postgraduate School, March 2008.Thesis Advisor(s): Brutzman, Don ; Buss, Arnold ; Norbraten,Terry. "March 2008." Description based on title screen as viewed on May 5, 2008. Includes bibliographical references (p. 89-90). Also available in print.
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Montgomery, David Eric. "Modeling and visualization of laser-based three-dimensional experimental spatial dynamic response." Diss., This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-10052007-143439/.
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Feng, Mi. "Quantifying, Modeling and Managing How People Interact with Visualizations on the Web." Digital WPI, 2019. https://digitalcommons.wpi.edu/etd-dissertations/518.
Повний текст джерелаАнотація:
The growing number of interactive visualizations on the web has made it possible for the general public to access data and insights that were once only available to domain experts. At the same time, this rise has yielded new challenges for visualization creators, who must now understand and engage a growing and diverse audience. To bridge this gap between creators and audiences, we explore and evaluate components of a design-feedback loop that would enable visualization creators to better accommodate their audiences as they explore the visualizations. In this dissertation, we approach this goal by quantifying, modeling and creating tools that manage people’s open-ended explorations of visualizations on the web. In particular, we: 1. Quantify the effects of design alternatives on people’s interaction patterns in visualizations. We define and evaluate two techniques: HindSight (encoding a user’s interaction history) and text-based search, where controlled experiments suggest that design details can significantly modulate the interaction patterns we observe from participants using a given visualization. 2. Develop new metrics that characterize facets of people’s exploration processes. Specifically, we derive expressive metrics describing interaction patterns such as exploration uniqueness, and use Bayesian inference to model distributional effects on interaction behavior. Our results show that these metrics capture novel patterns in people’s interactions with visualizations. 3. Create tools that manage and analyze an audience’s interaction data for a given visualization. We develop a prototype tool, ReVisIt, that visualizes an audience’s interactions with a given visualization. Through an interview study with visualization creators, we found that ReVisIt make creators aware of individual and overall trends in their audiences’ interaction patterns. By establishing some of the core elements of a design-feedback loop for visualization creators, the results in this research may have a tangible impact on the future of publishing interactive visualizations on the web. Equipped with techniques, metrics, and tools that realize an initial feedback loop, creators are better able to understand the behavior and user needs, and thus create visualizations that make data and insights more accessible to the diverse audiences on the web.
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Larsen, Matthew. "Performance Modeling of In Situ Rendering." Thesis, University of Oregon, 2017. http://hdl.handle.net/1794/22297.
Повний текст джерелаАнотація:
With the push to exascale, in situ visualization and analysis will play an increasingly important role in high performance computing. Tightly coupling in situ visualization with simulations constrains resources for both, and these constraints force
a complex balance of trade-offs. A performance model that provides an a priori answer for the cost of using an in situ approach for a given task would assist in managing the trade-offs between simulation and visualization resources. In this work, we present
new statistical performance models, based on algorithmic complexity, that accurately predict the run-time cost of a set of representative rendering algorithms, an essential in situ visualization task. To train and validate the models, we create data-parallel rendering algorithms within a light-weight in situ infrastructure, and we conduct a performance study of an MPI+X rendering infrastructure used in situ with three HPC simulation applications. We then explore feasibility issues using the model for selected in situ rendering questions.
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Huang, Xiaoke. "USING GRAPH MODELING IN SEVERAL VISUAL ANALYTIC TASKS." Kent State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=kent1467738860.
Повний текст джерела
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Lundgren, Martin. "Bending, Twisting and Turning : Protein Modeling and Visualization from a Gauge-Invariance Viewpoint." Doctoral thesis, Uppsala universitet, Teoretisk fysik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-172358.
Повний текст джерелаАнотація:
Proteins in nature fold to one dominant native structure. Despite being a heavily studied field, predicting the native structure from the amino acid sequence and modeling the folding process can still be considered unsolved problems. In this thesis I present a new approach to this problem with methods borrowed from theoretical physics. In the first part I show how it is possible to use a discrete Frenet frame to define the discrete curvature and torsion of the main chain of the protein. This method is then extended to the side chains as well. In particular I show how to use the discrete Frenet frame to produce a statistical distribution of angles that works in similar fashion as the commonly used Ramachandran plot and side chain rotamers. The discrete Frenet frame displays a gauge symmetry, in the choice of basis vectors on the normal plane, that is reminiscent of features of Abelian-Higgs theory. In the second part of the thesis I show how this similarity with Abelian-Higgs theory can be translated into an effective energy for a protein. The loops of the proteins are shown to correspond to solitons so that the whole protein can be constructed by gluing together any number of solitons. I present results of simulating proteins by minimizing the energy, starting from a real line or straight helix, where the correct native fold is attained. Finally the model is shown to display the same phase structure as real proteins.
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Pöthkow, Kai [Verfasser]. "Modeling, Quantification and Visualization of Probabilistic Features in Fields with Uncertainties / Kai Pöthkow." Berlin : Freie Universität Berlin, 2015. http://d-nb.info/1074139348/34.
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Kretschmer, Jan [Verfasser], and Marc [Gutachter] Stamminger. "Modeling and Visualization of Vascular and Skeletal Anatomy / Jan Kretschmer ; Gutachter: Marc Stamminger." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2017. http://d-nb.info/1140917080/34.
Повний текст джерела
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Heron, Marlon. "Modeling, simulation, and visualization for submarine transit security and Coast Guard contingency Preparedness." Thesis, Monterey, California: Naval Postgraduate School, 2015. http://hdl.handle.net/10945/45872.
Повний текст джерелаАнотація:
Approved for public release; distribution is unlimitedThe U.S. Navy’s Strategic Systems Program (SSP) and the U.S. Coast Guard (USCG) Maritime Force Protection Unit (MFPU) have a close working relationship, access to advanced Modeling and Simulation (M&S) tools, and a mutual interest in the safe escort of naval subMarines. The USCG Contingency Preparedness and Exercises (CPE) Branch has a strong interest in maritime security, which extends to the safe navigation of vessels in U.S. territorial waters, including naval subMarines. CPE rarely interacts with SSP and the MFPU; further, CPE does not have access to modern M&S tools. The goal of this thesis is to demonstrate that SSP and MFPU can greatly increase maritime security in the littoral waterways used by subMarines and other naval vessels by partnering with CPE. A mixed method approach was used to provide an overview of existing maritime security roles and partnerships, and a 3D-simulation experiment was also developed to demonstrate how CPE can enhance exercises by utilizing robust 3D M&S resources. This thesis establishes that CPE can drastically improve maritime security and other missions by leveraging M&S and Visualization tools. The thesis also found that by partnering with SSP and the MFPU, CPE can accelerate maritime security improvements.
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Bither, Cheryl Ann, and Julie A. Dougherty. "A modeling strategy for large-scale optimization based on analysis and visualization principles." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/28372.
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Kurzion, Yair. "Visualization enhancement by embedding local and global modeling operations in the rendering process /." The Ohio State University, 1998. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487950153602376.
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Zheng, Jianian. "A Classification and Visualization System for Lower-Limb Activities Analysis With Musculoskeletal Modeling." Case Western Reserve University School of Graduate Studies / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=case1586094993458825.
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Petryk, Mykhaylo, Sebastien Leclerc, Daniel Canet, and Jacques Fraissard. "Mathematical modeling and visualization of gas transport in a zeolite bed using a slice selection procedure: Mathematical modeling and visualization of gas transport in azeolite bed using a slice selection procedure." Diffusion fundamentals 4 (2007) 11, S. 1-23, 2007. https://ul.qucosa.de/id/qucosa%3A14283.
Повний текст джерелаАнотація:
We present the analytical solution of the equations of gas diffusion in a heterogeneous zeolite bed. The problem is handled by assuming that the bed consists of a large number of very thin layers of solid, perpendicular to the direction of propagation of the gas. Mass transfer by diffusion in such a material is determined by a system of differential equations with boundary and interface conditions. The results allow the theoretical determination of the time dependence of the concentration profiles and the inter- and intra-crystallite diffusion coefficients of a gas in each layer of the bed. A numerical application concerns the diffusion of benzene in a cylindrical bed of ZSM5 displaced vertically and rapidly, step by step, inside the NMR probe. Thus we can obtain the time dependence of the concentration of gas absorbed at the level of each slice. These coupled investigations give a better understanding of the diffusion process in this multilayer material.
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Stuetzle, Christopher S. "Computer modeling and visualization of luminescent crystals : the role of energy transfer and upconversion /." Norton, MA : Wheaton College, 2007. http://hdl.handle.net/10090/727.
Повний текст джерела
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Suantak, Liana Son. "Modeling, simulation and visualization of stability and support operations using coevolution: Concepts and environment." Diss., The University of Arizona, 2005. http://hdl.handle.net/10150/280773.
Повний текст джерелаАнотація:
Current military simulations focus on high resolution, conventional warfare models based on well-established military doctrine. These systems allow commanders and soldiers to investigate friendly and enemy courses-of-action (COAs) that have been created by military commanders and their analysts. One exception to these systems is FOX, which generates friendly COAs using a genetic algorithm that engage with several static enemy COAs in conventional warfare scenarios. This dissertation extends the use of genetic algorithms to coevolution, a multi-sided genetic algorithm, for non-conventional warfare operations, termed Stability and Support Operations (SASO), which constitute many of the current major military operations in the world. It presents the concepts for a system that generates, simulates, and visualizes COAs for non-conventional units as well as conventional units' force distributions in a SASO environment. The simulation includes such factors as political climate, multi-sided faction animosities, and the influence of information operations on local populations. To allow fast wargaming, many concepts such as terrain and incident types are abstracted, instead of requiring the time-consuming high-resolution models currently in use. It also proposes that the analysis of coevolution strategies benefits from examining changes in fitness function, instead of the fitness function directly, as is generally done for one-sided genetic algorithms. As inputs, a military expert defines a scenario by specifying an environment of locales, factions and entities that belong to multiple sides. In the Sheherazade SASO Simulation, these entities occupy and move between locales, engage in combat, and work to calm or agitate the local populations. Each entity has a COA, which determines its planned moves and targets of attack. For conventional military units, the COAs represent their force distribution. A coevolution algorithm, or a multi-sided genetic algorithm, evolves these COAs based on the scores that result from the simulation. Visualization tools, including iconographs and other configural displays, allow the analysis and comparison of COAs over generations. The COAs that evolve represent strategies for each side to fulfill their competing goals, and can be used by an analyst as a decision support tool for training or planning.
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Alper, Sabri Serim Erlak. "A Cad-Based Modeling For Dynamic Visualization of Urban Environments in Piecemeal (ıncremental) Growth/." [s.l.]: [s.n.], 2002. http://library.iyte.edu.tr/tezler/master/sehirplanlama/T000149.rar.
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Zandieh, Behdis. "Indoor Wireless Local Area Network (WLAN) : Measurement and Modeling from a user perspective." Thesis, KTH, Kommunikationssystem, CoS, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-92012.
Повний текст джерелаАнотація:
If we had detailed wireless local area network (WLAN) coverage maps, both staff and equipment could be used more efficiently, for example, less time would be spent searching for connectivity. In addition, system administrators could understand their WLAN's utilization better, thus enabling better planning for where to install new access points, where to remove access points, where to change the type of antenna, etc. This thesis concerns creating detailed indoor coverage models by using measured network performance - in order to enable both users and administrators to visualize the network coverage. Today a user can only easily know about the access points that they currently hear – in the location where they currently are. Giving the users and administrators access to a model of the entire campus coverage will allow them to understand not only the _local_ coverage, but the patterns of coverage (or lack there of). However, no efficient modeling techniques are currently available for those deploying and operating indoor WLANs. The thesis begins with some general background information and then examines a number of WLAN survey tools; in terms of both their performance and cost. Following this a number of related projects are presented. This background provides the motivation for why a new tool is needed and what functions such a tool should have. Next a site survey of the KTH campus in Kista was conducted using a newly developed survey application. This application was developed to better meet the requirements derived from the missing functionality of existing tools. In addition, developing this application gave the author an opportunity to learn a new objectoriented programming language, i.e. C# and the .NET environment. Learning to use this new environment was essential to building both an easy to use application and collecting the data from the system - the later was often not straight-forward. ne of the key issues after data collection is how to present the collected data to the user and how this varies depending upon the user’s interests and task. An initial representation of the experimental data is presented as a manually painted coverage map overlayed onto a map. Next the thesis examines how to integrate the experimental data using Google’s SketchUp in order to build a 3D model of the WLAN coverage on this campus. Future work related to this thesis should focus on how to automate the collection of data and how to automate the presentation of the resulting experimental data.Om vi hade tillgång till detaljerade täckningskartor över lokala nätverk (WLAN), skulle både personal och utrustning kunna användas mer ändamålsenligt. Till exempel skulle mindre tid gå åt till att söka täckning. Dessutom skulle systemadministratörer förstå användningen av deras WLAN:s på ett bättre sätt, vilket skulle möjliggöra bättre planering av var nya accesspunkter ska installeras, var accesspunkter ska tas bort, var man ska byta antenntyp, osv. Detta examensarbete handlar om skapande av detaljerade täckningsmodeller för användning inomhus vilka genererats genom att mäta nätverkets styrka – detta för att göra det möjligt för båda användare och administratörer att visualisera nätverkstäckning. Idag kan en användare endast känna till accesspunkter som de just för tillfället hör – på den plats där de för tillfället befinner sig. Att ge användarna och administratörerna tillgång till en modell av täckningen över hela Campus skulle inte bara göra att de uppfattade den lokala täckningen utan hela täckningsmönster (eller avsaknaden därav). Dock finns för tillfället inga ändamålsenliga modelleringstekniker för de som utvecklar och sköter WLAN:s inomhus. Examensarbetet inleds med en del bakgrundsinformation och går därefter in på ett antal metoder för att kartlägga WLAN, både vad gäller prestanda och kostnad. Härefter presenteras ett antal relaterade projekt. Denna bakgrund är till för att motivera varför ett nytt verktyg behövs och vilka funktion ett sådant verktyg borde ha. Efter denna litteratur- och bakgrundsstudie gjordes en kartläggning av KTH Campus i Kista med användning av en nyligen utvecklad applikation. Applikationen togs fram för att på ett bättre sätt uppfylla kraven som följde av saknade funktioner i existerande verktyg. Dessutom gav utvecklingen av applikationen författaren en möjlighet att lära sig objektorienterad programmering med t ex C# och .NET-miljön. Att lära sig att använda denna nya programmeringsmiljö var en nödvändighet för att kunna bygga både en lättanvänd applikation och samla in data från systemet – de senare var oftast inte helt lätt. En av de största svårigheterna efter datainsamlingen var att hitta ett sätta att presentera den insamlade informationen samt hur presentationen ska variera beroende på användaren behov och uppgift. En första presentation av experimentdata presenteras som en manuellt ritad täckningskarta lagd ovanpå en vanlig karta. Nästa steg i examensarbetet är att undersöka hur man ska integrera experimentdata genom att använda Google:s SketchUp för att bygga en 3D-modell av WLAN-täckning på Campus i Kista. Framtida utveckling relaterad till detta examensarbete borde fokusera på hur man ska kunna automatisera datainsamlingen och presentationen av resulterande experimentdata.
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Zakaria, Mohamed Yehia. "Unsteady Nonlinear Aerodynamic Modeling and Applications." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/79909.
Повний текст джерелаАнотація:
Unsteady aerodynamic modeling is indispensable in the design process of rotary air vehicles, flapping flight and agile unmanned aerial vehicles. Undesirable vibrations can cause high-frequency variations in motion variables whose effects cannot be well predicted using quasi-steady aerodynamics. Furthermore, one may exploit the lift enhancement that can be generated through an unsteady motion for optimum design of flapping vehicles. Additionally, undesirable phenomena like the flutter of fixed wings and ensuing limit cycle oscillations can be exploited for harvesting energy. In this dissertation, we focus on modeling the unsteady nonlinear aerodynamic response and present various applications where unsteady aerodynamics are very relevant.
The dissertation starts with experiments for measuring unsteady loads on an NACA-0012 airfoil undergoing a plunging motion under various operating conditions. We supplement these measurements with flow visualization to obtain better insight into phenomena causing enhanced lift. For the model, we present the frequency response function for the airfoil at various angles of attack. Experiments were performed at reduced frequencies between 0.1 and 0.95 and angles of attack up to 65 degrees. Then, we formulate an optimization problem to unify the transfer function coefficients for each regime independently to obtain one model that represents the global dynamics. An optimization-based finite-dimensional (fourth-order) approximation for the frequency responses is developed. Converting these models to state-space form and writing the entries of the matrices as polynomials in the mean angle of attack, a unified unsteady model was developed. In the second set of experiments, we measured the unsteady plunging forces on the same airfoil at zero forward velocity. The aim is to investigate variations of the added forces associated with the oscillation frequency of the wing section for various angles of attack. Data of the measured forces are presented and compared with predicted forces from potential flow approximations. The results show a significant departure from those estimates, especially at high frequencies indicating that viscous effects play a major role in determining these forces.
In the second part of this dissertation, we consider different applications where unsteady loads and nonlinear effects play an important role. We perform a multi-objective aerodynamic optimization problem of the wing kinematics and planform shape of a Pterosaur replica ornithopter. The objective functions included minimization of the required cycle-averaged aerodynamic power and maximization of the propulsive efficiency. The results show that there is an optimum kinematic parameter as well as planform shape to fulfill the two objectives. Furthermore, the effects of preset angle of attack, wind speed and load resistance on the levels of harvested power from a composite beam bonded with the piezoelectric patch are determined experimentally. The results point to a complex relation between the aerodynamic loading and its impact on the static deflection and amplitudes of the limit cycle oscillations as well as the level of power harvested. This is followed by testing of a centimeter scale micro wind turbine that has been proposed to power small devices and to work as a micro energy harvester. The experimental measurements are compared to predicted values from a numerical model.
The methods developed in this dissertation provide a systematic approach to identifying unsteady aerodynamic models from numerical or experimental data that may work within different regimes. The resulting reduced-order models are expressed in a state-space form, and they are, therefore, both simple and efficient. These models are low-dimensional linear systems of ordinary differential equations so that they are compatible with modern flight dynamic models. The specific form of the obtained added force model, which defines the added forces as a function of plunging velocity and drag forces, guarantees that the resulting model is accurate over a range of high frequencies. Moreover, presented applications give a sense of the broad range of application of unsteady aerodynamics.Ph. D.
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Ankele, Michael Peter [Verfasser]. "Higher-Order Tensors and Differential Topology in Diffusion MRI Modeling and Visualization / Michael Peter Ankele." Bonn : Universitäts- und Landesbibliothek Bonn, 2019. http://d-nb.info/1188731769/34.
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Ankele, Michael [Verfasser]. "Higher-Order Tensors and Differential Topology in Diffusion MRI Modeling and Visualization / Michael Peter Ankele." Bonn : Universitäts- und Landesbibliothek Bonn, 2019. http://d-nb.info/1188731769/34.
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LARSON, JON SCOTT. "THE VISUALIZATION, QUANTIFICATION AND MODELING OF GENOMIC INSTABILITY IN THE MOUSE AND IN CULTURED CELLS." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1163452507.
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Gagné, Marissa Marlene. "An Analysis and Critique of DEM Creaion and 3-D Modeling Using Airborne LIDAR and Photogrammetric Techniques." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/43528.
Повний текст джерелаАнотація:
Three-dimensional (3D) visualization is rapidly becoming an important tool for many engineering projects. Accurate digital representations of terrain and ground features are extremely useful for efficient design, communication and data representation in projects involving land development, transportation planning, hydrologic analysis, environmental impact studies, and much more. Within the scope of terrain modeling lie a wide variety of techniques used to build digital elevation models (DEMs). Each approach has inherent problems and difficulties that can alter the accuracy and usability of the DEM produced.
The main objectives of this study are to examine the various methods used for the creation of digital elevation models and make recommendations as to the appropriate techniques to use depending on specific project circumstances. Data sets generated using two of the methods, photogrammetry and LIDAR, are used to build digital terrain models in various software packages for an analysis of data usability and function.
The key results of this research project are two DEMs of a real-world transportation study area and a set of conclusions and recommendations that give insight into the exact methods to be used on various projects. The paper ends with two short appendices, the first of which discusses several software packages and their effectiveness in DEM creation and 3-D modeling. The final appendix is a flow chart summarizing the recommendations for the seven DEM creation methods.Master of Science
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Costin, Aaron M. "Integration of passive RFID location tracking for real-time visualization in building information models (BIM)." Thesis, Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50395.
Повний текст джерелаАнотація:
Navigation through large and unfamiliar facilities with labyrinths of corridors and rooms is difficult and often results in a person being lost. Additionally, locating a specific utility within a facility is often a tough task. The hypothesis tested in this research is that integrating real-time automated sensing technology and a Building Information Model will provide real time visualization that can assist in localization and navigation of a facility. The scope of this research is facility maintenance management during the Operation and Maintenance (O&M) phase of a facility. The thesis demonstrates how the integration of passive Radio Frequency Identification (RFID) tracking technology and Building Information Modeling (BIM) can assist in facilities maintenance management. The objectives of this research included 1) developing a framework that utilizes the integration of commercially-available RFID and a BIM model; 2) evaluating the framework for real-time resource location tracking within an indoor environment; and 3) developing an algorithm for real-time localization and visualization in a BIM model. A prototype application has been developed that simultaneously connects the RFID readers, a database, and a BIM model. The goal of this system is to have a real-time localization accuracy of 3 meters at 95% confidence. Testing was conducted in laboratory conditions, and the results show that the system error was within the 3 meters goal.
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Krecklau, Lars [Verfasser]. "The algorithmic beauty of cities : interactive modeling and realtime visualization of compact procedural descriptions / Lars Krecklau." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2013. http://d-nb.info/1046974246/34.
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Petryk, Mykhaylo, Sebastien Leclerc, Daniel Canet, and Jacques Fraissard. "Mathematical modeling and visualization of gas transport in a zeolite bed using a slice selection procedure." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-194491.
Повний текст джерелаАнотація:
We present the analytical solution of the equations of gas diffusion in a heterogeneous zeolite bed. The problem is handled by assuming that the bed consists of a large number of very thin layers of solid, perpendicular to the direction of propagation of the gas. Mass transfer by diffusion in such a material is determined by a system of differential equations with boundary and interface conditions. The results allow the theoretical determination of the time dependence of the concentration profiles and the inter- and intra-crystallite diffusion coefficients of a gas in each layer of the bed. A numerical application concerns the diffusion of benzene in a cylindrical bed of ZSM5 displaced vertically and rapidly, step by step, inside the NMR probe. Thus we can obtain the time dependence of the concentration of gas absorbed at the level of each slice. These coupled investigations give a better understanding of the diffusion process in this multilayer material.