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Chan, Yip-cheung, and 陳葉祥. "Experimental-theoretical interplay in dynamic geometry environments." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B41633921.
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Jasutė, Egle. "Interactive visualization model for the constructionist teaching and learning of geometry." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2014. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2014~D_20141209_111855-74602.
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Teaching of mathematics is one of the most complicated and demanding disciplines in a curriculum. The aim of a teacher is not only to communicate knowledge but also to engage the students, motivate them and involve in active learning process by encouraging them to construct their knowledge and competencies. Dynamic geometry systems based on the principle of constructionist learning enable to effectively involve students into the activity by constructing their mathematical knowledge and competencies. However, teachers of mathematics find it difficult to employ the systems since the technical skills of the teachers are inadequate. The visualization of secondary school geometry by using the systems of dynamic geometry systems, i.e. interactive microworlds, can help to solve the problem.
The dissertation has analysed the methods of informatics which are employed to develop learning software, the capacities of dynamic geometry systems and the concepts of constructionist teaching and learning as well as interactive visualization. A model to create interactive microworlds is presented with reference to the implemented technological capacities of dynamic geometry systems and the didactics of constructionist teaching of mathematics. The syntax and semantics of dynamic geometry objects has been formalized through the abstract data types which help to describe scenarios of interactive visualization according to a model.
The model has been implemented through the visualization of 9-10... [to full text]<br>Matematikos mokymas viena iš sudėtingiausių ir daugiausiai dėmesio reikalaujanti disciplina mokykliniame kurse. Mokytojo tikslas ne tik perteikti žinias, bet sudominti, motyvuoti ir įtraukti klasės mokinius į aktyvų mokymosi procesą konstruojant savo žinias ir gebėjimus. Dinaminės geometrijos sistemos grįstos konstrukcionistinio mokymosi principu padeda efektyviai įtraukti mokinius į veiklą konstruojant matematines žinias ir gebėjimus. Tačiau matematikos mokytojui sudėtinga naudoti šias sistemas, nes dažnai mokytojo techniniai gebėjimai yra nepakankami. Šiai problemai išspręsti gali padėti mokyklinės geometrijos vizualizavimas panaudojant dinaminės geometrijos sistemas – sukurti interaktyvūs mikropasauliai.
Disertacijoje išnagrinėti informatikos metodai taikomi kuriant skaitmenines priemones mokymuisi, dinaminių geometrijos sistemų galimybės, konstrukcionistinio mokymo(si), interaktyvaus vizualizavimo sąvokos. Pateikiamas modelis interaktyviems mikropasauliams kurti atsižvelgiant į naudojamos dinaminės geometrijos sistemos technologines galimybes ir konstrukcionistinio matematikos mokymo didaktiką. Formalizuota dinaminės geometrijos objektų sintaksė ir semantika abstrakčiaisiais duomenų tipais, kuri padeda aprašyti scenarijus interaktyviam vizualizavimui pagal modelį.
Modelis įgyvendintas vizualizuojant 9-10 klasės matematikos kursą. Sukurta apie 400 interaktyvių mikropasaulių. Atliktas įvertinimas parodė, kad modelis gali būti įgyvendintas įvairiose dinaminės geometrijos... [toliau žr. visą tekstą]
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Frazee, Leah M. "The Interaction of Geometric and Spatial Reasoning: Student Learning of 2D Isometries in a Special Dynamic Geometry Environment." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1531862080144028.
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Nascimento, Eimard Gomes Antunes do. "AvaliaÃÃo do software geogebra como instrumento psicopedagÃgico de ensino em geometria." Universidade Federal do CearÃ, 2012. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=7492.
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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior<br>O estudo tem por objetivo avaliar o software livre Geogebra para o ensino aprendizagem de geometria, como uma ferramenta psicopedagÃgica, com destaque aos recursos que facilitam a integraÃÃo e uso do programa com os conteÃdos curriculares, professores e alunos. O software pode ser aplicado desde as sÃries inicias do ensino fundamental, em estudos universitÃrios e em cursos a distÃncia via internet. O Geogebra à um software sobre matemÃtica dinÃmica, gratuito e de multi-plataforma para todos os nÃveis de ensino, que combina geometria, Ãlgebra, tabelas, grÃficos, estatÃstica e cÃlculo em um Ãnico sistema. A geometria que apresenta foi validada e designada como Geometria DinÃmica e Interativa (GDI), isto Ã, uma implementaÃÃo computacional das tecnologias usadas, tais como: rÃgua, compasso, esquadro e transferidor os quais permitem que os modelos construÃdos, apesar de estÃticos, sejam movidos mantendo as propriedades da construÃÃo, acrescenta ainda movimentos dinÃmicos e transforma o computador em um laboratÃrio matemÃtico, onde se pode executar vÃrias prÃticas tecnolÃgicas. O estudo sobre o ensino-aprendizagem da geometria e Ãlgebra se configura por meio de uma pesquisa descritiva de carÃter exploratÃrio e quase-experimental. O trabalho desvela a realidade empÃrica por meio da metodologia quali-quantitativa, na qual se coteja os dados e a interface entre as variÃveis qualitativas e quantitativas, mediante os princÃpios do estudo de caso Ãnico com apresentaÃÃo da anÃlise dos dados. Conclui-se que o programa, alÃm de inovador, à bem aceito pelos alunos e professores que se apropriam desta tecnologia para a aquisiÃÃo de saberes e conhecimentos em matemÃtica e, por via de consequÃncia, da geometria e Ãlgebra. Atualmente, o programa està em grande expansÃo e bem divulgado em todo no mundo.<br>This current study presents the assessment on Geogebra free software for teaching geometry, as a psycho-pedagogical approach, highlighting resources that facilitate integration and use of program with professors and studentsâ learning topics. The software can be applied from earlier primary-school students to college ones as well as distance education programs by using internet. Geogebra is a free dynamic mathematic software and multiple-platform for all learning levels, combining geometry, algebra, tables, plotting, graphics, statistics and one-system calculation. The geometry presented was guaranteed and assigned as dynamic geometry and interactive (GDI) that is it, a computer implementation such as: rulers, drawing, square, calipers. Those tools provide motion by keeping construction properties in a static state though, in addition, dynamic motions in order to transforming the computer into a mathematics laboratory where one can perform several technological practices. The study about teaching and learning on geometry and algebra configures itself by means of a descriptive research with exploiting characteristics and almost experimental. The established steps follow as: - re-conception of teaching and learning of mathematics; re-dimension of theories and researches on evaluation. The study of case about assessment of programs on near-by qualitative methodology, in which data and the interface between several presentation of data analysis. We have concluded that the software is innovator and well measured by students and professors who have already used that technology for acquiring knowledge on mathematics and consequently for using in algebra and geometry. Currently, the program is in a long run a great insight and well known throughout.
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Doulgerakis, Emmanouil. "Influence of Switches and Crossings on Wheel Wear of a Freight Vehicle." Thesis, KTH, Spårfordon, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-134704.
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Turnouts (Switches & Crossings) are important components in railway networks, as they provide the necessary flexibility for train operations by allowing trains to change among the tracks. But the turnout’s geometry with discontinuity in rail profiles and lack of transition curve causes additional wear both on track and on vehicle. The main goal of this MSc thesis is to investigate the influence of turnouts on wheel wear of a freight vehicle. This will be obtained by simulations in the commercial MBS software GENSYS. The wheel-rail contact is modelled according to Hertz’s theory and Kalker’s simplified theory, with the FASTSIM algorithm, and the wear calculations are performed according to Archard’s law. Wheel wear is estimated by considering variations in parameters which have effect on wheel-rail contact. All these variations are common in daily rail operation, and they are caused by it, i.e. worn wheel profiles, worn crossing nose and different stiffness of the stock and the switch rails at the beginning of the turnout. Moreover, the wheel wear is calculated for both possible directions which a vehicle can run, the diverging and the straight direction of the turnout. Especially for the straight direction, various running speeds have been tested as the speed limit when the vehicle follows the straight direction is higher than for the diverging part. Running with worn wheel profiles has the greatest impact in terms of increasing the wheel wear, especially on the outer part of wheel tread. In addition, the worn crossing nose results in increased wheel wear in this area. The results of the simulations concerning the different stiffness showed that the wheel wear caused by the contact of wheel and stock rail increases whereas the wear caused by the contact with the switch rail is kept at about the same level or decreases. It is concluded that turnouts have a significant impact on wheel wear, mainly because of the discontinuity in rail geometry and all the investigated parameters increase this impact. Moreover, great differences in wear values for areas close to each other are observed, mainly because of the wear coefficient values chosen in Archard’s wear map.
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NASCIMENTO, Eimard Gomes Antunes. "Avaliação do software geogebra como instrumento psicopedagógico de ensino em geometria." http://www.teses.ufc.br, 2012. http://www.repositorio.ufc.br/handle/riufc/3081.
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NASCIMENTO, Eimard Gomes Antunes . Avaliação do software geogebra como instrumento psicopedagógico de ensino em geometria. 2012.113f. Dissertação (Mestrado em Educação) – Universidade Federal do Ceará, Faculdade de Educação, Programa de Pós-Graduação em Educação Brasileira, Fortaleza-CE, 2012.<br>Submitted by Maria Josineide Góis (josineide@ufc.br) on 2012-07-06T12:04:55Z
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Previous issue date: 2012<br>This current study presents the assessment on Geogebra free software for teaching geometry, as a psycho-pedagogical approach, highlighting resources that facilitate integration and use of program with professors and students’ learning topics. The software can be applied from earlier primary-school students to college ones as well as distance education programs by using internet. Geogebra is a free dynamic mathematic software and multiple-platform for all learning levels, combining geometry, algebra, tables, plotting, graphics, statistics and one-system calculation. The geometry presented was guaranteed and assigned as dynamic geometry and interactive (GDI) that is it, a computer implementation such as: rulers, drawing, square, calipers. Those tools provide motion by keeping construction properties in a static state though, in addition, dynamic motions in order to transforming the computer into a mathematics laboratory where one can perform several technological practices. The study about teaching and learning on geometry and algebra configures itself by means of a descriptive research with exploiting characteristics and almost experimental. The established steps follow as: - re-conception of teaching and learning of mathematics; re-dimension of theories and researches on evaluation. The study of case about assessment of programs on near-by qualitative methodology, in which data and the interface between several presentation of data analysis. We have concluded that the software is innovator and well measured by students and professors who have already used that technology for acquiring knowledge on mathematics and consequently for using in algebra and geometry. Currently, the program is in a long run a great insight and well known throughout.<br>O estudo tem por objetivo avaliar o software livre Geogebra para o ensino aprendizagem de geometria, como uma ferramenta psicopedagógica, com destaque aos recursos que facilitam a integração e uso do programa com os conteúdos curriculares, professores e alunos. O software pode ser aplicado desde as séries inicias do ensino fundamental, em estudos universitários e em cursos a distância via internet. O Geogebra é um software sobre matemática dinâmica, gratuito e de multi-plataforma para todos os níveis de ensino, que combina geometria, álgebra, tabelas, gráficos, estatística e cálculo em um único sistema. A geometria que apresenta foi validada e designada como Geometria Dinâmica e Interativa (GDI), isto é, uma implementação computacional das tecnologias usadas, tais como: régua, compasso, esquadro e transferidor os quais permitem que os modelos construídos, apesar de estáticos, sejam movidos mantendo as propriedades da construção, acrescenta ainda movimentos dinâmicos e transforma o computador em um laboratório matemático, onde se pode executar várias práticas tecnológicas. O estudo sobre o ensino-aprendizagem da geometria e álgebra se configura por meio de uma pesquisa descritiva de caráter exploratório e quase-experimental. O trabalho desvela a realidade empírica por meio da metodologia quali-quantitativa, na qual se coteja os dados e a interface entre as variáveis qualitativas e quantitativas, mediante os princípios do estudo de caso único com apresentação da análise dos dados. Conclui-se que o programa, além de inovador, é bem aceito pelos alunos e professores que se apropriam desta tecnologia para a aquisição de saberes e conhecimentos em matemática e, por via de consequência, da geometria e álgebra. Atualmente, o programa está em grande expansão e bem divulgado em todo no mundo.
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Winroth, Harald. "Dynamic projective geometry." Doctoral thesis, Stockholm : Tekniska högsk, 1999. http://www.lib.kth.se/abs99/winr0324.pdf.
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Blom, Kristopher James. "Dynamic, interactive virtual environments." Göttingen Sierke, 2009. http://d-nb.info/992932998/04.
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Reach, Andrew McCaleb. "Smooth Interactive Visualization." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/78848.
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Information visualization is a powerful tool for understanding large
datasets. However, many commonly-used techniques in information
visualization are not C^1 smooth, i.e. when represented as a
function, they are either discontinuous or have a discontinuous first
derivative. For example, histograms are a
non-smooth visualization of density. Not only are histograms
non-smooth visually, but they are also non-smooth over their parameter
space, as they change abruptly in response to smooth change of bin
width or bin offset. For large data visualization, histograms are
commonly used in place of smooth alternatives, such as kernel density
plots, because histograms can be constructed from data cubes, allowing histograms to be constructed quickly for large datasets.
Another example of a non-smooth technique in information visualization
is the commonly-used transition approach to animation. Although
transitions are designed to create smooth animations, the transition
technique produces animations that have velocity discontinuities if
the target is changed before the transition has finished. The smooth
and efficient zooming and panning technique also shares this
problem---the animations produced are smooth while in-flight, but they
have velocity discontinuities at the beginning and end and of the
animation as well as velocity discontinuities when interrupted.
This dissertation applies ideas from signal processing to construct
smooth alternatives to these non-smooth techniques. To visualize
density for large datasets, we propose BLOCs, a smooth alternative to
data cubes that allows kernel density plots to be constructed quickly
for large datasets after an initial preprocessing step. To create
animations that are smooth even when interrupted, we present LTI
animation, a technique that uses LTI filters to create animations that
are smooth, even when interrupted. To create zooming and panning
animations that are smooth, even when interrupted, we generalize
signal processing systems to Riemannian manifolds, resulting in
smooth, efficient, and interruptible animations.<br>Ph. D.
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Chan, Yip-cheung. "Experimental-theoretical interplay in dynamic geometry environments." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B41633921.
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Hao, Xuejun. "Efficient geometry and illumination representations for interactive protein visualization." College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/1902.
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Thesis (Ph. D.) -- University of Maryland, College Park, 2004.<br>Thesis research directed by: Computer Science. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Or, Chi-ming. "Experimentation, construction, conjecturing and explanation in a dynamic geometry environment." Click to view the E-thesis via HKUTO, 2005. http://sunzi.lib.hku.hk/hkuto/record/B35675007.
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Teillaud, Monique. "Towards dynamic randomized algorithms in computational geometry /." Berlin [u.a.] : Springer, 1993. http://www.loc.gov/catdir/enhancements/fy0815/93023628-d.html.
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Tsui, Wing Shum. "Nasal geometry and airflow dynamic in Chinese /." access full-text access abstract and table of contents, 2009. http://libweb.cityu.edu.hk/cgi-bin/ezdb/thesis.pl?phd-bc-b23750881f.pdf.
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Thesis (Ph.D.)--City University of Hong Kong, 2009.<br>"Submitted to Department of Building and Construction in partial fulfillment of the requirements for the degree of Doctor of Philosophy." Includes bibliographical references (leaves 217-263)
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Persson, Niklas. "Resolution Independent Path Rendering of Dynamic Geometry." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-451968.
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Vector graphics rendering is the subject of a large number of research papers. However, many of them lack results regarding animated vector graphics despite its importance in many fields. In this thesis the resolution independent rendering of animated graphics is studied. A testing platform is implemented to evaluate selected rendering backends based on state-of-the-art rendering algorithms and widely used vector graphics libraries. The selected rendering algorithms were selected because they were lacking results for animated graphics. The objectives of the work are achieved through the analysis of the results produced by the animation platform on specifically designed scenarios. The performance of the renderers is evaluated in terms of frame time and sensitivity to various parameters defining the animation. The results showed that the algorithms not originally designed for rendering animated graphics are applicable for this task but tradeoffs have to be made to choose a suitable rendering backend.
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Velo, James. "The impact of dynamic geometry software on students' abilities to generalize in geometry /." The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486401895208994.
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Margerison, Paul. "An algorithmic and interactive approach to computer art." Thesis, Open University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240001.
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Denner-Broser, Britta [Verfasser]. "Tracing-problems in dynamic geometry / Britta Denner-Broser." Berlin : Freie Universität Berlin, 2009. http://d-nb.info/1023491117/34.
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Hidalgo, García Marta R. "Geometric constraint solving in a dynamic geometry framework." Doctoral thesis, Universitat Politècnica de Catalunya, 2013. http://hdl.handle.net/10803/134690.
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Geometric constraint solving is a central topic in many fields such as parametric solid modeling, computer-aided design or chemical molecular docking. A geometric constraint problem consists of a set geometric objects on which a set of constraints is defined. Solving the geometric constraint problem means finding a placement for the geometric elements with respect to each other such that the set of constraints holds.
Clearly, the primary goal of geometric constraint solving is to define rigid shapes. However an interesting problem arises when we ask whether allowing parameter constraint values to change with time makes sense. The answer is in the positive. Assuming a continuous change in the variant parameters, the result of the geometric constraint solving with variant parameters would result in the generation of families of different shapes built on top of the same geometric elements but governed by a fixed set of constraints. Considering the problem where several parameters change simultaneously would be a great accomplishment. However the potential combinatorial complexity make us to consider problems with just one variant parameter. Elaborating on work from other authors, we develop a new algorithm based on a new tool we have called h-graphs that properly solves the geometric constraint solving problem with one variant parameter. We offer a complete proof for the soundness of the approach which was missing in the original work.
Dynamic geometry is a computer-based technology developed to teach geometry at secondary school, which provides the users with tools to define geometric constructions along with interaction tools such as drag-and-drop. The goal of the system is to show in the user's screen how the geometry changes in real time as the user interacts with the system. It is argued that this kind of interaction fosters students interest in experimenting and checking their ideas. The most important drawback of dynamic geometry is that it is the user who must know how the geometric problem is actually solved. Based on the fact that current user-computer interaction technology basically allows the user to drag just one geometric element at a time, we have developed a new dynamic geometry approach based on two ideas: 1) the underlying problem is just a geometric constraint problem with one variant parameter, which can be different for each drag-and-drop operation, and, 2) the burden of solving the geometric problem is left to the geometric constraint solver.
Two classic and interesting problems in many computational models are the reachability and the tracing problems. Reachability consists in deciding whether a certain state of the system can be reached from a given initial state following a set of allowed transformations. This problem is paramount in many fields such as robotics, path finding, path planing, Petri Nets, etc. When translated to dynamic geometry two specific problems arise: 1) when intersecting geometric elements were at least one of them has degree two or higher, the solution is not unique and, 2) for given values assigned to constraint parameters, it may well be the case that the geometric problem is not realizable. For example computing the intersection of two parallel lines. Within our geometric constraint-based dynamic geometry system we have developed an specific approach that solves both the reachability and the tracing problems by properly applying tools from dynamic systems theory.
Finally we consider Henneberg graphs, Laman graphs and tree-decomposable graphs which are fundamental tools in geometric constraint solving and its applications. We study which relationships can be established between them and show the conditions under which Henneberg constructions preserve graph tree-decomposability. Then we develop an algorithm to automatically generate tree-decomposable Laman graphs of a given order using Henneberg construction steps.
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Olivero, Federica. "The proving process within a dynamic geometry environment." Thesis, University of Bristol, 2003. http://hdl.handle.net/1983/ed52d690-e35f-4bd8-8a3a-74a8b7de5f7c.
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Gillis, John M. Martin W. Gary. "An investigation of student conjectures in static and dynamic geometry environments." Auburn, Ala., 2005. http://repo.lib.auburn.edu/EtdRoot/2005/SPRING/Curriculum_and_Teaching/Dissertation/GILLIS_JOHN_2.pdf.
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Nave, Jr Gary Kirk. "Nonlinear Models and Geometric Structure of Fluid Forcing on Moving Bodies." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/84945.
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This dissertation presents useful nonlinear models for fluid forcing on a moving body in two distinct contexts, and methods for analyzing the geometric structure within those and other mathematical models. This manuscript style dissertation presents three works within the theme of understanding fluid forcing and geometric structure.
When a bluff body is free to move in the presence of an incoming bluff body wake, the average forcing on the body is dependent on its position relative to the upstream bluff body. This position-dependent forcing can be conceptualized as a stiffness, much like a spring. This work presents an updated model for the quasi-steady fluid forcing of a wake and extends the notion of wake stiffness to consider a nonlinear spring. These results are compared with kinematic experimental results to provide an example of the application of this framework.
Fluid force models also play a role in understanding the behavior of passive aerodynamic gliders, such as gliding animals or plant material. The forces a glider experiences depend on the angle that its body makes with respect to its direction of motion. Modeling the glider as capable of pitch control, this work considers a glider with a fixed angle with respect to the ground. Within this model, all trajectories in velocity space collapse to a 1-dimensional invariant manifold known as the terminal velocity manifold. This work presents methods to identify the terminal velocity manifold, investigates its properties, and extends it to a 2-dimensional invariant manifold in a 3-dimensional space.
Finally, in the search for manifolds such as the terminal velocity manifold, this dissertation introduces a new diagnostic for identifying the low dimensional geometric structure of models. The trajectory divergence rate uses instantaneous vector field information to identify regions of large normal stretching and strong normal convergence between nearby invariant manifolds. This work lays out the mathematical basis of the trajectory divergence rate and shows its application to approximate a variety of structures including slow manifolds and Lagrangian coherent structures.
This dissertation applies nonlinear theoretical and numerical techniques to analyze models of fluid forcing and their geometric structure. The tools developed in this dissertation lay the groundwork for future research in the fields of flow-induced vibration, plant and animal biomechanics, and dynamical systems.<br>Ph. D.
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Rajala, Johannes. "Dynamic Controllable Mesh Deformation in Interactive Environments." Thesis, Linköpings universitet, Institutionen för teknik och naturvetenskap, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-95302.
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The purpose of this project was to research and develop methods for managing the deformation of complex geometric meshes with specific reference to interactive computer games. Bugbear Entertainment has a proven record of accomplishment in the development of car racing games. The creation and management of deformable meshes in real time is a vital component in such games, since it allows the player to visually experience the effect of a real-life car accident. This thesis is meant for people having basic understanding of computer graphics simulation in general, as well as a basic mathematical background for the matrix algebra.
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Pagenkopf, Eric L. "Dynamic stall analysis utilizing interactive computer graphics." Thesis, Monterey, California. Naval Postgraduate School, 1988. http://hdl.handle.net/10945/23185.
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A Navier-Stokes problem solver, developed by L. N. Sankar, is modified to provide dynamic, interactive graphical presentations of predicted flow field solutions about a NACA-0012 airfoil section oscillating in pitch, in order to demonstrate the capabilities of dynamic graphics applications in the study of complex, unsteady flows. Flow field solutions in the form of pressure coefficient and stream function contour plots about an airfoil experiencing dynamic stall are plotted utilizing an IRIS 3000-series workstation and Graphical Animation System (GAS) software, developed by Sterling Software for NASA. These full cycle solutions in conjunction with dynamic surface pressure distribution plots and integrated lift, pitching moment and full cycle solutions, in conjunction with dynamic surface pressure distribution plots and integrated lift, pitching moment and drag coefficient data, are compared to existing experimental data in order to provide an indication of the validity of the code's far-field solution. Full procedural documentation is maintained in order to provide an efficient analysis tool for use in future oscillating airfoil studies planned by the NASA-Ames Fluid Mechanics Laboratory and the Naval Postgraduate School Department of Aeronautics and Astronautics. Keywords: Dynamic stall, Computer graphics, IRIS, Flow visualization, Theses. (jes)
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Capell, Steve. "Interactive character animation using dynamic elastic simulation /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/6987.
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Morkel, Chantelle. "Non-interactive modeling tools and support environment for procedural geometry generation." Thesis, Rhodes University, 2006. http://eprints.ru.ac.za/242/.
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Lee, Man-sang Arthur. "Impact of exploration in a dynamic geometry environment on students' concept of proof." Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B18034019.
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Yu, Paul W. Presmeg Norma C. Barrett Jeffrey Edward. "Prototype development and discourse among middle school students in a dynamic geometric environment." Normal, Ill. Illinois State University, 2004. http://wwwlib.umi.com/cr/ilstu/fullcit?p3172886.
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Thesis (Ph. D.)--Illinois State University, 2004.<br>Title from title page screen, viewed November 22, 2005. Dissertation Committee: Norma C. Presmeg, Jeffrey E. Barrett (co-chairs), Sherry L. Meier. Includes bibliographical references (leaves 186-194) and abstract. Also available in print.
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Moss, Laura Jean. "The use of dynamic geometry software as a cognitive tool /." Digital version:, 2000. http://wwwlib.umi.com/cr/utexas/fullcit?p9992879.
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Husain, Syed Farzad. "Perceiving dynamic environments : from surface geometry to semantic representation." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/403959.
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Perceiving human environments is becoming increasingly fundamental with the gradual adaptation of robots for domestic use. High-level tasks such as the recognition of objects and actions need to be performed far the active engagement of the robot with its surroundings. Nowadays, the environment is primarily captured using visual information in the form of color and depth images.
Visual cues obtained from these images serve as a base upan which perception-related applications are developed. Far example, using appearance models far detecting objects and extracting motion infarmation far recognizing actions. However, given the complex variations of naturally occurring scenes, extracting a set of robust visual cues becomes harder here than in other contexts.
In this thesis, we develop a hierarchy of tools to improve the different aspects of robot perception in human-centered, possibly dynamic, environments. We start with the segmentation of single images and extend it to videos. Afterwards, we develop a surface tracking approach along with the incorporation of our video segmentation method. We then investigate the higher-level tasks of semantic segmentation and recognition. Finally, we focus on recognizing actions in videos. The introduction of Kinectstyle depth sensors is relatively new and its usage in the field of robotics cannot be found befare half a decade ago. Such sensors enable the acquisition of high-resolution color and depth images at a low cost. Given this opportunity, we dedícate a bulk of our work to the exploitation of the depth infarmation obtained using such sensors, thereby pushing forward the state-of-the-art in perception problems.
The thesis is conceptually grouped into two parts. In the first part, we address the low-level tasks of segmentation and tracking with depth images. In many cases, depth data gives a better disambiguation of surface boundaries of different objects in a scene when compared to their color counterpart. We exploit this information in a novel depth segmentation scheme that fits quadratic surface models on different surfaces in a competing fashion . We further extend the method to the video domain by initializing the segmentation results and surface model parameters from the previous trame for the next trame. In this way, we successfully create a video segmentation algorithm, in which the segment label belonging to each surface becomes coherent over time. We also devise a particle-filter-based tracker that uses depth data to track a surface. The tracker is made more robust by combining it with our video segmentation approach.
The segmentation results serve as a useful prior for high-level tasks. In the second part we deal with such tasks which include (i) object recognition, (ii) pixelwise object class segmentation, and (iii) action recognition . We propase (i) to address object recognition by creating context-aware conditional random field models. We show the importance of the context in object recognition by modeling geometrical relations between different objects in a scene. We perform (ii) object class segmentation using a convolutional neural network. We introduce a novel distance-from-wall feature and demonstrate its effectiveness in generating better class proposals for objects that are clase to the walls. The final part of the thesis deals with (iii) action recognition. We propase a 2D convolutional neural network extended to a concatenated 3D network that learns to extrae! features
from the spatio-temporal domain of raw video data. The network is trained to predict an action label for each video.
In summary, several perception aspects are addressed with the utilization of depth infarmation where available. Our main contributions are (a) the introduction of a depth video segmentation scheme, (b) a graphical model far object recognition, and our proposals of the deep learning models for (e) object class segmentation and (d) action recognition.<br>Los sistemas de percepción en entornos humanos son cada vez más importantes para la adaptación gradual de los robots a tareas domésticas. Tareas de alto nivel, tales como el reconocimiento de objetos y acciones, son necesarias para conseguir la participación activa del robot en dichas tareas. Hoy en día el entorno del robot es capturado principalmente usando información visual en forma de imágenes de color y profundidad. Las características visuales obtenidas a partir de estas imágenes sirven como base para el desarrollo de aplicaciones relacionadas con la percepción del robot. Por ejemplo, el uso de modelos de apariencia para la detección de objetos y la extracción de información del movimiento para el reconocimiento de acciones. Sin embargo, dado que las escenas pueden contener variaciones complejas, la extracción de un conjunto de características visuales puede convertirse en una tarea muy difícil. En la presente tesis hemos desarrollado una jerarquía de herramientas para mejorar diferentes aspectos de la percepción del robot en entornos humanos, posiblemente dinámicos. Esta tesis comienza con la segmentación de imágenes individuales, que luego se extiende a vídeos. Posteriormente, diseñamos un enfoque de seguimiento de superficies que incorpora nuestro método de segmentación de vídeos. A continuación, investigamos tareas de alto nivel para la segmentación semántica y el reconocimiento. Finalmente, nos centramos en el reconocimiento de acciones en vídeos. La introducción de sensores de profundidad tipo Kinect es relativamente nueva y su uso en el campo de la robótica empezó hace tan solo media década. Tales sensores permiten la adquisición de color y profundidad de imágenes de alta resolución a bajo coste. Dada esta oportunidad, dedicamos una buena parte de nuestro trabajo a la explotación de la información de profundidad obtenida a través de dichos sensores, mejorando el estado del arte en problemas de percepción. La tesis está conceptualmente dividida en dos partes. En primer lugar, abordamos las tareas de bajo nivel de segmentación y seguimiento con imágenes de profundidad. En muchos casos, los datos de profundidad permite una mejor desambiguación de los límites de las superficies de diferentes objetos de una escena en comparación con los datos de color. Explotamos esta información en un nuevo esquema de segmentación de profundidad que ajusta modelos cuadráticos de superficies de forma competitiva. Extendemos el método a vídeos de modo que la etiquetación de superficies resulte coherente en el tiempo. También proponemos un rastreador basado en un filtro de partículas que utiliza los datos de profundidad para realizar el seguimiento de una superficie. El seguimiento se hace más robusto al combinarlo con nuestro enfoque de segmentación en vídeo. Los resultados de la segmentación son usados como información a priori para tareas de alto nivel. En la segunda parte nos ocupamos de este tipo de tareas que incluyen el (i) reconocimiento de objetos, (ii) la segmentación de clases de objetos a nivel de píxeles, y (iii) el reconocimiento de acciones. Proponemos (i) abordar el reconocimiento de objetos mediante la creación de modelos de campos aleatorios condicionales sensibles al contexto. Realizamos (ii) la segmentación de la clase del objeto utilizando una red neuronal de convolución. Se introduce una nueva característica de distancia-a-paredes y demostramos su eficacia en la mejora de la clasificación de objetos que están cerca de las paredes. La parte final de la tesis se ocupa del (iii) reconocimiento de acciones. Proponemos una red neuronal de convolución 2D extendida a una red 3D concatenada, que aprende a extraer las características del dominio espacio-temporal de los datos de vídeo. La red está capacitada para predecir la etiqueta de acción para cada vídeo.
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Davorka, Radaković. "Metadata-Supported Object-Oriented Extension of Dynamic Geometry SoftwareTI." Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2019. https://www.cris.uns.ac.rs/record.jsf?recordId=111034&source=NDLTD&language=en.
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Nowadays, Dynamic Geometry Software (DGS) is widely accepted as a tool for creating and presenting visually rich interactive teaching and learning materials, called dynamic drawings. Dynamic drawings are specified by writing expressions in functional domain-specific languages. Due to wide acceptance of DGS, there has arisen a need for their extensibility, by adding new semantics and visual objects (visuals). We have developed a programming framework for the Dynamic Geometry Software, SLGeometry, with a genericized functional language and corresponding expression evaluator that act as a framework into which specific semantics is embedded in the form of code annotated with metadata. The framework transforms an ordinary expression tree evaluator into an object-oriented one, and provide guidelines and examples for creation of interactive objects with dynamic properties, which participate in evaluation optimization at run-time. Whereas other DGS are based on purely functional expression evaluators, our solution has advantages of being more general, easy to implement, and providing a natural way of specifying object properties in the user interface, minimizing typing and syntax errors.LGeometry is implemented in C# on the .NET Framework. Although attributes are a preferred mechanism to provide association of declarative information with C# code, they have certain restrictions which limit their application to representing complex structured metadata. By developing a metadata infrastructure which is independent of attributes, we were able to overcome these limitations. Our solution, presented in this dissertation, provides extensibility to simple and complex data types, unary and binary operations, type conversions, functions and visuals, thus enabling developers to seamlessly add new features to SLGeometry by implementing them as C# classes annotated with metadata. It also provides insight into the way a domain specific functional language of dynamic geometry software can be genericized and customized for specific needs by extending or restricting the set of types, operations, type conversions, functions and visuals.Furthermore, we have conducted experiments with several groups of students of mathematics and high school pupils, in order to test how our approach compares to the existing practice. The experimental subjects tested mathematical games using interactive visual controls (UI controls) and sequential behavior controllers. Finally, we present a new evaluation algorithm, which was compared to the usual approach employed in DGS and found to perform well, introducing advantages while maintaining the same level of performance.<br>U današnje vreme softver za dinamičku geometriju (DGS) je široko prihvaćen kao alat za kreiranje i prezentovanje vizuelno bogatih interaktivnih nastavnih materijala i materijala za samostalno učenje, nazvanih dinamičkim crtežima. Kako je raslo prihvatanje softvera za dinamičku geometriju, tako je i rasla potreba da se oni proširuju, dodajući im novu semantiku i vizualne objekte. Razvili smo programsko okruženje za softver za dinamičku geometriju, SLGeometry, sa generičkim funkcionalnim jezikom i odgovarajućim evaluatorom izraza koji čini okruženje u kom su ugrađene specifične semantike u obliku koda označenog metapodacima. Ovo okruženje pretvara uobičajen evaluator stabla izraza u objektno orijentiran, te daje uputstva i primere za stvaranje interaktivnih objekata sa dinamičkim osobinama, koji sudeluju u optimizaciji izvršenja tokom izvođenja. Dok se drugi DGS-ovi temelje na čisto funkcionalnim evaluatorima izraza, naše rješenje ima prednosti jer je uopštenije, lako za implementaciju i pruža prirodan način navođenja osobina objekta u korisničkom interfejsu, minimizirajući kucanje i sintaksne greške. SLGeometry je implementirana u jeziku C# .NET Framework-a. Iako su atributi preferiran mehanizam, koji povezuje C# kôd sa deklarativnim informacijama, oni imaju određena ograničenja koja limitiraju njihovu primenu za predstavljanje složenih strukturiranih metapodataka. Razvijanjem infrastrukture metapodataka koja je nezavisna od atributa, uspeli smo prevladati ta ograničenja. Naše rešenje, predstavljeno u ovoj disertaciji, pruža proširivost: jednostavnim i složenim vrstama podataka, unarnim i binarnim operacijama, konverzijama tipova, funkcijama i vizuelnim objektima, omogućavajući time programerima da neprimetno dodaju nove osobine u SLGeometry implementirajući ih kao C# klase označene metapodacima.
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Poon, Chun-ho. "Efficient occlusion culling and non-refractive transparency rendering for interactive computer visualization /." Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk:8888/cgi-bin/hkuto%5Ftoc%5Fpdf?B22925880.
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Oleson, Jonathan Everett. "The teacher-interactive videodisc interface: Explicating the dynamic." Diss., The University of Arizona, 1995. http://hdl.handle.net/10150/187132.
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As educators plan for utilization of new technologies which hold promise for improving student learning experiences, they must understand how to assist classroom teachers in efficaciously approaching their use. Twenty nine of a randomly chosen pool of 100 grades 3-12 classroom teachers from a large north central United States school district were exposed as novices to Interactive Videodisc (IVD) and their experience with this relatively new technology examined. Responses to IVD use and background variables were compared in an effort to isolate predictive factors of teachers who are more prone to experience a positive initial interface with IVD. Subjects experienced an IVD multicultural lesson either in a small group or in relative isolation. Qualitative and quantitative data are presented which show teacher/subject responses to IVD as an instructional/learning medium. Although a generally favorable response to IVD was demonstrated, stronger positive experiences were reported by those who initially used IVD with a small group of colleagues than those who worked alone. Comfort level indicators (criterion variables) in novice use of IVD are found to correlate significantly to eight predictor variables through a multiple regression analysis.
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Civit, Flores Óscar. "Robust interactive simulation of deformable solids with detailed geometry using corotational FEM." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/383751.
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This thesis focuses on the interactive simulation of highly detailed deformable solids modelled with the Corotational Finite Element Method.
Starting from continuum mechanics we derive the discrete equations of motion and present a simulation scheme with support for user-in-the-loop interaction, geometric constraints and contact treatment. The interplay between accuracy and computational cost is discussed in depth, and practical approximations are analyzed with an emphasis on robustness and efficiency, as required by interactive simulation.
The first part of the thesis focuses on deformable material discretization using the Finite Element Method with simplex elements and a corotational linear constitutive model, and presents our contributions to the solution of widely reported robustness problems in case of large stretch deformations and finite element degeneration. First,we introduce a stress differential approximation for quasi-implicit corotational linear FEM that improves its results for large deformations and closely matches the fullyimplicit solution with minor computational overhead. Next, we address the problem ofrobustness and realism in simulations involving element degeneration, and show that existing methods have previously unreported flaws that seriously threaten robustness and physical plausibility in interactive applications. We propose a new continuous-time approach, degeneration-aware polar decomposition, that avoids such flaws and yields robust degeneration recovery.
In the second part we focus on geometry representation and contact determination for deformable solids with highly detailed surfaces. Given a high resolution closed surface mesh we automatically build a coarse embedding tetrahedralization and a partitioned representation of the collision geometry in a preprocess. During simulation, our proposed contact determination algorithm finds all intersecting pairs of deformed triangles using a memory-efficient barycentric bounding volume hierarchy, connects them into potentially disjoint intersection curves and performs a topological flood process on the exact intersection surfaces to discover a minimal set of contact points. A novel contact normal definition is used to find contact point correspondences suitable for contact treatment.<br>Aquesta tesi tracta sobre la simulació interactiva de sòlids deformables amb superfícies detallades, modelats amb el Mètode dels Elements Finits (FEM) Corotacionals. A partir de la mecànica del continuu derivem les equacions del moviment discretes i presentem un esquema de simulació amb suport per a interacció d'usuari, restriccions geomètriques i tractament de contactes. Aprofundim en la interrelació entre precisió i cost de computació, i analitzem aproximacions pràctiques fent èmfasi en la robustesa i l'eficiència necessàries per a la simulació interactiva. La primera part de la tesi es centra en la discretització del material deformable mitjançant el Mètode dels Elements Finits amb elements de tipus s'implex i un model constituent basat en elasticitat linial corotacional, i presenta les nostres contribucions a la solució de problemes de robustesa àmpliament coneguts que apareixen en cas de sobreelongament i degeneració dels elements finits. Primer introduïm una aproximació dels diferencials d'estress per a FEM linial corotacional amb integració quasi-implícita que en millora els resultats per a deformacions grans i s'apropa a la solució implícita amb un baix cost computacional. A continuació tractem el problema de la robustesa i el realisme en simulacions que inclouen degeneració d'elements finits, i mostrem que els mètodes existents presenten inconvenients que posen en perill la robustesa plausibilitat de la simulació en aplicacions interactives. Proposem un enfocament nou basat en temps continuu, la descomposició polar amb coneixement de degeneració, que evita els inconvenients esmentats i permet corregir la degeneració de forma robusta. A la segona part de la tesi ens centrem en la representació de geometria i la determinació de contactes per a sòlids deformables amb superfícies detallades. A partir d'una malla de superfície tancada construím una tetraedralització englobant de forma automàtica en un preprocés, i particionem la geometria de colisió. Proposem un algorisme de detecció de contactes que troba tots els parells de triangles deformats que intersecten mitjançant una jerarquia de volums englobants en coordenades baricèntriques, els connecta en corbes d'intersecció potencialment disjuntes i realitza un procés d'inundació topològica sobre les superfícies d'intersecció exactes per tal de descobrir un conjunt mínim de punts de contacte. Usem una definició nova de la normal de contacte per tal de calcular correspondències entre punts de contacte útils per al seu tractament.
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Maiduang, Alongkot. "Dynamic geometry environment and its relation to thai students' higher-order thinking : reasoning in Euclidean geometry." Thesis, King's College London (University of London), 2013. https://kclpure.kcl.ac.uk/portal/en/theses/dynamic-geometry-environment-and-its-relation-to-thai-students-higherorder-thinking(f3395341-41de-4cb5-9a0b-0c2834f681b7).html.
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Since its introduction in the late 1980s, Dynamic Geometry Software (DGS) has become one of the most innovative tools in mathematics education. It is defined as graphical software, where geometric figures can be constructed with pre-defined relationships, which will retain when the figures are dynamically manipulated. This digital tool provides a new geometry learning environment inherently different from the traditional paper-and-pencil mode. This research investigates the situation where learners interact directly with this dynamic geometry environment. It examines how learners interpret DGS key features; such as drag-mode and parent-and-child relationship, and how such interpretations relate to their higher-order thinking of reasoning in geometric tasks. Three types of reasoning strategies are pursued in this research. These are: inductive reasoning, deductive reasoning and abductive reasoning. How and to what extent the DGS environment plays a role in the learner's reasoning strategies and arguments is the question at the focus of this research. Vygotsky's model of tool used as mediated activity and Verillon & Rabardel's Instrumented Activity Situation (IAS) model are used as a framework for this research. These models help to distinguish the independent roles of the learner, the DGS tool, the designed tasks and Euclidean geometry in the overall setting. They also help to clarify the influences that each of these entities may have on each other. The research is conducted in Thailand with a Thai version of The Geometer's Sketchpad to a group of 14-15 year-old lower secondary students. The research method used is a task-based interview, where pairs of students perform geometric construction and exploration tasks with Geometer's Sketchpad while the researcher challenges their reasoning. This research finds the tension between the deductive reasoning nature in Euclidean geometry, the inductive nature of visual presentation in the dynamic geometry environment, and the influence of students' experience in the paper-and-pencil environment on their interpretation of dynamic geometry. Abductive reasoning is found to be students' main reasoning strategy, with a combination of inductive and deductive reasoning to support their verification of the hypothesis.
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Knapp, Andrea K. Barrett Jeffrey Edward. "Prompting mathematics teacher development through dynamic discourse." Normal, Ill. : Illinois State University, 2007. http://proquest.umi.com/pqdweb?index=0&did=1417799381&SrchMode=1&sid=8&Fmt=2&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1207665349&clientId=43838.
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Thesis (Ph. D.)--Illinois State University, 2007.<br>Title from title page screen, viewed on April 8, 2008. Dissertation Committee: Jeffrey Barrett (chair), Nerida Ellerton, Sharon Soucy McCrone, Cynthia Moore, Michael Plantholt, Agida Manizade. Includes bibliographical references (leaves 200-215) and abstract. Also available in print.
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Paiva, Ana Maria Severino de Almeida e. "Dynamic user and learner modeling." Thesis, Lancaster University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309025.
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Or, Chi-ming, and 柯志明. "Experimentation, construction, conjecturing and explanation in a dynamic geometry environment." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B35675007.
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Marlow, Kelsey A. "Clinical Interviews of Shape Understanding in a Dynamic Geometry Environment." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1492506014768381.
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Waddington, Michael Jon. "Development of an Interactive Wave Drag Capability for the OpenVSP Parametric Geometry Tool." DigitalCommons@CalPoly, 2015. https://digitalcommons.calpoly.edu/theses/1435.
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Minimizing wave drag is critical to successful and efficient transonic and supersonic flight. Area-ruling is the process of managing the cross-sectional area of an aircraft to lessen the wave drag experienced in flight. Effectively calculating the necessary areas for a given aircraft can be difficult, and existing tools for conducting a wave drag analysis often carry limitations in both functionality and availability.
In this work, the author utilized an existing parametric geometry tool named OpenVSP to create an interactive design tool for approximating zero-lift wave drag. Here, the wave drag calculation methodology used in industry for decades is combined with the powerful geometry engine of OpenVSP, which was recently heavily upgraded at the start of 2015. Various visual aids allow users of this OpenVSP wave drag tool to interact with area and wave drag results and develop intuition for supersonic aircraft design using the area rule approach. OpenVSP allows geometry changes to be made quickly, enabling rapid reanalysis by the wave drag tool for expeditious comparison of results across the design space.
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Savage, Valkyrie Arline. "Fabbed to Sense| Integrated Design of Geometry and Sensing Algorithms for Interactive Objects." Thesis, University of California, Berkeley, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10191122.
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<p>Task-specific tangible input devices, like video game controllers, improve user speed and accuracy in input tasks compared to the more general-purpose touchscreen or mouse and keyboard. However, while modifying a graphical user interface (GUI) to accept mouse and keyboard inputs for new and specific tasks is relatively easy and requires only software knowledge, tangible input devices are challenging to prototype and build.
Rapid prototyping digital fabrication machines, such as vinyl cutters, laser cutters, and 3D printers, now permeate the design process for such devices. Using these tools, designers can realize a new tangible design faster than ever. In a typical design process, these machines are not used to create the interaction in these interactive product prototypes: they merely create the shell, case, or body, leaving the designer to, in an entirely separate process, assemble and program electronics for sensing a user's input. What are the most cost-effective, fast, and flexible ways of sensing rapid-prototyped input devices? In this dissertation, we investigate how 2D and 3D models for input devices can be automatically generated or modified in order to employ standard, off-the-shelf sensing techniques for adding interactivity to those objects: we call this ``fabbing to sense.''
We describe the capabilities of modern rapid prototyping machines, linking these abilities to potential sensing mechanisms when possible. We plunge more deeply into three examples of sensing/fabrication links: we build analysis and design tools that help users design, fabricate, assemble, and \emph{use} input devices sensed through these links. First, we discuss Midas, a tool for building capacitive sensing interfaces on non-screen surfaces, like the back of a phone. Second, we describe Lamello, a technique that generates lasercut and 3D printed tine structures and simulates their vibrational frequencies for training-free audio sensing. Finally, we present Sauron, a tool that automatically modifies the interior of 3D input models to allow sensing via a single embedded camera. We demonstrate each technique's flexibility to be used for many types of input devices through a series of example objects.
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Burrill, Gail. "Mathematical Practices and the Role of Interactive Dynamic Technology." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-82412.
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Dearden, J. "Using interactive data visualisation to explore dynamic urban models." Thesis, University College London (University of London), 2012. http://discovery.ucl.ac.uk/1356102/.
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Dynamic urban models embody current theories about how urban systems evolve. To explore the consequences of this theory for a particular urban system requires an urban simulation because the theories are necessarily complicated to deal with the nonlinearity and complexity found in urban systems. Making sense of this output is challenging and in this thesis we explore using interactive visualisation and participation in a simulation to help a user interpret this output. Seven different simulation models are developed and explored using this methodology and applied to present day Greater London and South Yorkshire and the historical United States.
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Tian, Renran. "Validity and reliability of dynamic virtual interactive design methodology." Master's thesis, Mississippi State : Mississippi State University, 2007. http://library.msstate.edu/etd/show.asp?etd=etd-09242007-080500.
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Pedreira, Pedro Eugênio Rocha. "On indexing highly dynamic multidimensional datasets for interactive analytics." reponame:Repositório Institucional da UFPR, 2016. http://hdl.handle.net/1884/44470.
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Orientador : Prof. Dr. Luis Carlos Erpen de Bona<br>Tese (doutorado) - Universidade Federal do Paraná, Setor de Ciências Exatas, Programa de Pós-Graduação em Informática. Defesa: Curitiba, 15/04/2016<br>Inclui referências : f. 77-91<br>Área de concentração : Ciência da computação<br>Resumo: Indexação de dados multidimensionais tem sido extensivamente pesquisada nas últimas décadas. Neste trabalho, um novo workload OLAP identificado no Facebook é apresentado, caracterizado por (a) alta dinamicidade e dimensionalidade, (b) escala e (c) interatividade e simplicidade de consultas, inadequado para os SGBDs OLAP e técnicas de indexação de dados multidimensionais atuais. Baseado nesse caso de uso, uma nova estratégia de indexação e organização de dados multidimensionais para SGBDs em memória chamada Granular Partitioning é proposta. Essa técnica extende a visão tradicional de partitionamento em banco de dados, particionando por intervalo todas as dimensões do conjunto de dados e formando pequenos blocos que armazenam dados de forma não coordenada e esparsa. Desta forma, é possível atingir altas taxas de ingestão de dados sem manter estrutura auxiliar alguma de indexação. Este trabalho também descreve como um SGBD OLAP capaz de suportar um modelo de dados composto por cubos, dimensões e métricas, além de operações como roll-ups, drill-downs e slice and dice (filtros) eficientes pode ser construído com base nessa nova técnica de organização de dados. Com objetivo de validar experimentalmente a técnica apresentada, este trabalho apresenta o Cubrick, um novo SGBD OLAP em memória distribuída e otimizada para a execução de consultas analíticas baseado em Granular Partitioning, escritas desde a primeira linha de código para este trabalho. Finalmente, os resultados de uma avaliação experimental extensiva contendo conjuntos de dados e consultas coletadas de projetos pilotos que utilizam Cubrick é apresentada; em seguida, é mostrado que a escala desejada pode ser alcançada caso os dados sejam organizados de acordo com o Granular Partitioning e o projeto seja focado em simplicidade, ingerindo milhões de registros por segundo continuamente de uxos de dados em tempo real, e concorrentemente executando consultas com latência inferior a 1 segundo.<br>Abstrct: Indexing multidimensional data has been an active focus of research in the last few decades. In this work, we present a new type of OLAP workload found at Facebook and characterized by (a) high dynamicity and dimensionality, (b) scale and (c) interactivity and simplicity of queries, that is unsuited for most current OLAP DBMSs and multidimensional indexing techniques. To address this use case, we propose a novel multidimensional data organization and indexing strategy for in-memory DBMSs called Granular Partitioning. This technique extends the traditional view of database partitioning by range partitioning every dimension of the dataset and organizing the data within small containers in an unordered and sparse fashion, in such a way to provide high ingestion rates and indexed access through every dimension without maintaining any auxiliary data structures. We also describe how an OLAP DBMS able to support a multidimensional data model composed of cubes, dimensions and metrics and operations such as roll-up, drill-down as well as efficient slice and dice filtering) can be built on top of this new data organization technique. In order to experimentally validate the described technique we present Cubrick, a new in-memory distributed OLAP DBMS for interactive analytics based on Granular Partitioning we have written from the ground up at Facebook. Finally, we present results from a thorough experimental evaluation that leveraged datasets and queries collected from a few pilot Cubrick deployments. We show that by properly organizing the dataset according to Granular Partitioning and focusing the design on simplicity, we are able to achieve the target scale and store tens of terabytes of in-memory data, continuously ingest millions of records per second from realtime data streams and still execute sub-second queries.
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Beaulieu, Jason. "A Dynamic, Interactive Approach to Learning Engineering and Mathematics." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/32165.
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The major objectives of this thesis involve the development of both dynamic and interactive applications aimed at complementing traditional engineering and science coursework, laboratory exercises, research, and providing users with easy access by publishing the applications on Wolframs Demonstration website. A number of applications have been carefully designed to meet cognitive demands as well as provide easy-to-use interactivity.
Recent technology introduced by Wolfram Mathematica called CDF (Computable Document Format) provides a resource that gives ideas a communication pipeline in which technical content can be presented in an interactive format. This new and exciting technology has the potential to help students enhance depth and quality of understanding as well as provide teachers and researchers with methods to convey concepts at all levels. Our approach in helping students and researchers with teaching and understanding traditionally difficult concepts in science and engineering relies on the ability to use dynamic, interactive learning modules anywhere at any time.
The strategy for developing these applications resulted in some excellent outcomes. A variety of different subjects were explored, which included; numerical integration, Green's functions and Duhamel's methods, chaotic maps, one-dimensional diffusion using numerical methods, and two-dimensional wave mechanics using analytical methods. The wide range of topics and fields of study give CDF technology a powerful edge in connecting with all types of learners through interactive learning.<br>Master of Science
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McKenna, Kyra Patricia. "Real-time interactive dynamic mesh modeling : laparoscopic surgical simulation." Thesis, Queen's University Belfast, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492022.
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This thesis presents the results of research into interactive deformable mesh modeling for the purposes of simulating organ tissue. The research was based on developing a deformable model applicable to the development a low cost laparoscopic surgical simulator with a minimally specified hardware configuration. Modeling a dynamic deformable mesh involved developing the following key components: a physical algorithmic model to controls model deformation, real-time collision detection and response, mesh adaptation, mesh cutting and tool-organ interaction. For this research work, the components were developed and implemented to create a basic experimental surgical simulator. The components involve novel implementations and optimizations features and results demonstrate their application to model defonnable real-time interactive mesh.
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Bondorowicz, Stefan. "Adaptive control of complex dynamic systems." Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302787.
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Koivurova, H. (Hannu). "Dynamic behaviour of an axially moving membrane interacting with the surrounding air and making contact with supporting structures." Doctoral thesis, University of Oulu, 1998. http://urn.fi/urn:isbn:9514249496.
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Abstract
Axially moving material problems are concerned with the dynamic response, vibration and stability of slender members which are in a state of translation. In Finland these are particularly important in the functioning of paper machines, in which out of plane vibration in the paper web, known as flutter, which from the point of view of mechanics is a phenomenon typical of an axially moving material, limits operation speeds and therefore the productivity of the machines. This subject links together a number of physical phenomena associated with aerodynamics, web movement, material behaviour and the geometry of the system. The aim of this research is to present a theoretical and numerical formulation of the nonlinear dynamic analysis of an axially moving web.
The theoretical model is based on a mixed description of the continuum problem in the context of the dynamics of initially stressed solids. Membrane elasticity is included via a finite strain model, and the membrane transport speed through a kinematical study. Hamilton's principle provides nonlinear equations which describe the three-dimensional motion of the membrane.
The incremental equations of Hamilton's principle are discretized by the finite element method. The formulation includes geometrically nonlinear effects: large displacements, variations in membrane tension and variations in transport velocity due to deformation. This novel numerical model was implemented by adding an axially moving membrane element to a FEM program which contains acoustic fluid elements and contact algorithms. This allowed analysis of problems including interaction with the surrounding air field and contact between supporting structures.
The model was tested by comparing previous experiments and present nonlinear description of the dynamic behaviour of an axially moving web. The effects of contact between finite rolls and the membrane and interaction between the surrounding air and the membrane were included in the model. The results show that nonlinearities and coupling phenomena have a considerable effect on the dynamic behaviour of the system. The nonlinearities cause a noticeable stiffening of the membrane, and the vibration frequency of nonlinear system increases as the amplitude grows. At high values of transport velocity the first mode frequency passes over the second linear harmonic, and even the third. The results also show that the cylindrical supports have a distinct influence on the behaviour of an axially moving sheet. The boundary of the contact region clearly moves and weakens the nonlinear hardening phenomena that otherwise increase the fundamental frequency. This influence strengthens as the radius of the cylinders increases.
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Poon, Chun-ho, and 潘仲豪. "Efficient occlusion culling and non-refractive transparency rendering for interactive computer visualization." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B2974328X.
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