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Dissertations / Theses on the topic 'Coordinate system'
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Lluch, Daniel Cutuli. "Analysis of the Out-of-Control Falling Leaf Motion using a Rotational Axis Coordinate System." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/37055.
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The realm of aircraft flight dynamics analysis reaches from local static stability to global dynamic behavior. It includes aircraft performance issues as well as structural concerns. In the particular aspect of dynamic motions of an aircraft and how we understand them, an alternate coordinate system will be introduced that will lend insight and simplification into the understanding of these dynamic motions. The main contribution of this coordinate system is that one can easily visualize how the instantaneous velocity vector relates to the instantaneous rotation vector, the angular rate vector of the aircraft. The out-of-control motion known as the Falling Leaf will be considered under the light of this new coordinate system. This motion is not well understood and can lead to loss of the aircraft and crew. Design guidelines will be presented to predict amplitude and frequency of the Falling Leaf.
NOTE: (12/2009) An updated copy of this ETD was added after there were patron reports of problems with the file.Master of Science
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Fuente, C. de la. "High accuracy coordinate determination using Global Positioning System." Thesis, University of Nottingham, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384790.
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Baliga, Roshan Bantwal 1981. "Rapid coordinate system creation and mapping using Crickets." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/26718.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2004.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (leaves 55-56).
In this thesis, I describe a system that lays the foundation for context-aware applications. This system allows a user to set up a reference coordinate system in a room, using three Cricket listeners attached to a wooden frame. The system then assigns coordinates to Cricket beacons, which are placed on the ceiling. Finally, by using the frame in conjunction with a laser range finder, the user can generate a map of the room in the reference coordinate system, complete with features including doors, walls, and windows. This thesis also describes necessary changes we implemented that made the Cricket positioning system much more accurate.
by Roshan Bantwal Baliga.
M.Eng.
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Garrett, Travis Marshall Evans Charles Ross. "Simulating binary inspirals in a corotating spherical coordinate system." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2007. http://dc.lib.unc.edu/u?/etd,1112.
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Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2007.Title from electronic title page (viewed Mar. 27, 2008). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Physics and Astronomy." Discipline: Physics and Astronomy; Department/School: Physics and Astronomy.
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Asli, Kilic. "Coordinate Systems For A Naval Virtual Environment." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606465/index.pdf.
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The purpose of this thesis is implementing World Geodetic System (WGS) for Naval Surface Tactical Maneuvering Simulation System (NSTMSS), a High Level Architecture (HLA) based naval simulation, and also implementing body coordinate system for the ships of NSTMSS and its combination with WGS so that NSTMSS can be more accurate, and new ship dynamics models can be integrated to the NSTMSS environment more easily.
To improve the coordinate system of NSTMSS these methods were usedWorld Geodetic System - 1984 (WGS 84) was chosen as the reference system of new coordinate system of NSTMSS and coordinates were transformed to Universal Transverse Mercator (UTM) Coordinate System. Also, the terrains which NSTMSS uses created in OpenFlight (FLT) format with UTM map projection method. In addition to this, Ship Body Coordinate System was implemented as a Cartesian coordinate system. This thesis has achieved improved coordinate systems for the NSTMSS environment to increase the realism of the simulation.
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Yang, Qingping. "A hig precision probe system for three dimensional coordinate measurement." Thesis, Brunel University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339317.
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Lehman, Li-wei H. 1965. "PCoord : a decentralized network coordinate system for Internet distance prediction." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/31134.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2005.Includes bibliographical references (p. 163-168).
Several recently emerged Internet services make use of application-level or overlay networks. Examples of such services include overlay multicast, structured peer-to- peer lookup services, and peer-to-peer file sharing. Many of these services could benefit from enabling participating end hosts to estimate their relative network locations within the overlay. In this thesis, we present PCoord, a peer-to-peer network coordinate system for overlay topology discovery and distance prediction. The goal of PCoord is to allow participating peer nodes in an overlay network to collaboratively construct an accurate geometric model of the overlay network topology in a completely decentralized peer-to-peer fashion. We evaluate the PCoord approach through extensive simulations using both real network measurements and simulated topologies. Our simulation results indicate that PCoord can embed hosts in a low dimensional Euclidean model with a small median prediction error.
by Li-wei H. Lehman.
Ph.D.
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Francis, Gerald. "An Algorithm and System for Measuring Impedance in D-Q Coordinates." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/26462.
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This dissertation presents work conducted at the Center for Power Electronics Systems (CPES) at Virginia Polytechnic Institute and State University.
Chapter 1 introduces the concept of impedance measurement, and discusses previous work on this topic. This chapter also addresses issues associated with impedance measurement.
Chapter 2 introduces the analyzer architecture and the proposed algorithm. The algorithm involves locking on to the voltage vector at the point of common coupling between the analyzer and the system via a PLL to establish a D-Q frame. A series of sweeps are performed, injecting at least two independent angles in the D-Q plane, acquiring D- and Q-axis voltages and currents for each axis of injection at the point of interest.
Chapter 3 discusses the analyzer hardware and the criteria for selection. The hardware built ranges from large-scale power level hardware to communication hardware implementing a universal serial bus. An eight-layer PCB was constructed implementing analog signal conditioning and conversion to and from digital signals with high resolution. The PCB interfaces with the existing Universal Controller hardware.
Chapter 4 discusses the analyzer software. Software was written in C++, VHDL, and Matlab to implement the measurement process. This chapter also provides a description of the software architecture and individual components.
Chapter 5 discusses the application of the analyzer to various examples. A dynamic model of the analyzer is constructed, considering all components of the measurement system. Congruence with predicted results is demonstrated for three-phase balanced linear impedance networks, which can be directly derived based on stationary impedance measurements. Other impedances measured include a voltage source inverter, Vienna rectifier, six-pulse rectifier and an autotransformer-rectifier unit.Ph. D.
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Loh, Ming Hock. "Systematic modelling of a three-axes, non-contact coordinate measurement system." Thesis, University of Southampton, 2002. https://eprints.soton.ac.uk/47553/.
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A coordinate measurement machine (CMM) is an advanced, multi-purpose quality control system used to help inspection keep pace with modern production requirements. These machines can provide repeatable dimensional and geometric accuracy (micro- or nano-metre accuracy) of everything from small engine blocks, to sheet metal parts, to circuit boards. However, their performance may degrade when subjected to different forms of external disturbances, including geometric, kinematic, thermal and dynamic forces. By studying the influences of these disturbances, the impact on the machine measuring accuracy can be understood. The research work described in this thesis investigates two important aspects of machine accuracy of a newly developed coordinate measurement machine. The Small Coordinate Measuring Machine (SCMM) consists of a non-contact laser displacement probe supported on three mutually perpendicular (X, Y & Z) axes. The geometric and kinematic errors, which have been shown to account for more than two-thirds of the machine errors, of the SCMM were studied. A mathematical model has been proposed and incorporates geometric, kinematic and orientation errors of the probe that may have been introduced during the assembly process. Using the Renishaw performance measurement system, the error components of each individual carriage were diagnosed. The resulting study of these errors provided a better understanding of the performance of these positioning carriages. The mathematical model was also able to show the extent of the positioning errors of the carriages and the combined volumetric error of the SCMM. The second part of this research investigated the influence of drift on the probe output. This study aimed to demonstrate the magnitude of these environmental changes and the impact it has on the stability of the output of the non-contact, laser displacement probe. System Identification has been used to identify the correlation of the drift in the output of the probe and the changes reflected in the environment. A linear, 3rd order AutoRegressive model with eXogeneous input (ARX) has been chosen based on its merits. The results obtained from both the mathematical and linear models were eventually applied to a practical measurement problem, leading to a significant improvement in the measurement accuracy.
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Fishbaugh, James. "Development of a Higher-Order Ice Sheet Model Using a Rescaled Coordinate System." The University of Montana, 2008. http://etd.lib.umt.edu/theses/available/etd-05302008-101724/.
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The Intergovernmental Panel on Climate Change (IPCC) has estimated between 9 and 88 cm of sea level rise over the next hundred years. Of this, only negative 19 to 11 cm is attributed to the largest ice masses on the planet, the Antarctic and Greenland ice sheets. Over the last decade, dramatic activity in the outlet glaciers of Greenland and the Antarctic Peninsula raise the possibility that these large ice sheets will have a much greater contribution to sea level rise over the next century than was predicted by the IPCC. Recent studies have shown these areas are exhibiting decadal scale changes in response to climate forcings, whereas IPCC models show that ice is not responsive to climate change over such short periods of time. Many believe the IPCC type models fail to show short term climate responses due to the simplifications they make to ice sheet mechanics. Here, we develop a higher-order model -- a new ice sheet model which contains all relevant flow physics. In order to gauge our progress, we perform a verification of our model around a structured set of experiments. The analysis reveals our model is performing well over a range of different scenarios.
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Velu, Srinivasa Perumal. "Development of perfectly matched layer numerical boundary condition in a generalized coordinate system." Diss., Wichita State University, 2013. http://hdl.handle.net/10057/10618.
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The research activity leading to this dissertation focused on the boundary treatment for computational fluid dynamics problems, especially those with unbounded domains. This involved a rigorous literature survey of boundary treatment techniques. The primary interest of this effort was on one of the emerging concepts of nonreflecting boundary treatment for numerical schemes, namely the perfectly matched layer (PML) absorbing technique. The need for an appropriate space-time transformation for a stable PML emphasized in previous efforts was the starting point for this developmental research activity. Based on this, unsplit PML equations were constructed for Euler equations linearized over a uniform mean flow with a proper space-time transformation. Dispersion analysis was carried out to demonstrate the effectiveness of the space-time transformation in terms of stability of the PML formulation. Numerous numerical simulations were carried out to investigate the stability of the PML formulation for long-term integration of various combinations of time-step size and PML parameters. The major focus of this research was to extend the construction of the PML for nonlinear Euler equations in a generalized coordinate system to widen its application in uniform and nonuniform grid structures. Emphasis was placed on the application of conventional numerical schemes without employing any form of artificial dissipation or numerical filtering. With this objective in mind, the split-form PML equations for nonlinear Euler equations were constructed. Various numerical simulations were carried out to validate the PML formulation and demonstrate its effectiveness as an absorbing boundary condition.Thesis (Ph.D.)--Wichita State University, College of Engineering, Dept. of Aerospace Engineering.
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El-Gohary, Ahmed M. "Real-time three dimensional coordinate measurement and analysis : system design, implementation and testing." Thesis, University of Newcastle Upon Tyne, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328154.
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Pierce, Janine E. (Janine Elizabeth) 1980. "Coordinate system dependence of muscle forces predicted using optimization methods in musculoskeletal joints." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/27119.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2004.Includes bibliographical references (p. 143-147).
Optimization methods are widely used to predict in-vivo muscle forces in musculoskeletal joints. Moment equilibrium at the joint center (usually defined as the origin of the joint coordinate system) has been used as a constraint condition for optimization procedures and the joint reaction moments were assumed to be zero. This research project, through the use of a three-dimensional elbow model, investigated the effect of joint center location on muscle forces predicted using a nonlinear static optimization method. The results demonstrated that moving the joint center medially and laterally along the flexion-extension axis caused dramatic variations in the predicted muscle forces. For example, moving the joint center from a position 5 mm medial to 5 mm lateral of the geometric elbow center caused the predicted biceps force to vary from 12% to 46% and the brachialis force to vary from 80% to 34% of the total muscle loading. The joint reaction force reduced by 24% with this medial to lateral variation of the joint center location. This data revealed that the muscle forces predicted using optimization methods are sensitive to the joint center location due to the zero joint reaction moment assumption in the moment constraint condition. For accurate prediction of muscle load distributions using optimization methods, it is necessary to determine the true joint center location where the condition of a zero joint reaction moment is satisfied. Furthermore, improvements to the current optimization methodology were suggested. Incorporation of the 3D joint center location, as three unknown variables, into the optimization program was proposed, and this procedure was investigated for a pilot case incorporating one of the joint center components (y-axis variable) into the optimization.
(cont.) This thesis work indicates that all previously published data on muscle and joint loads predicted via optimization methods should be revisited since the joint reaction moment was eliminated in those works.
by Janine E. Pierce.
S.M.
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Barr, Michael. "The Influence of the Projected Coordinate System on Animal Home Range Estimation Area." Scholar Commons, 2014. https://scholarcommons.usf.edu/etd/5343.
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Animal home range estimations are important for conservation planning and protecting the habitat of threatened species. The accuracy of home range calculations is influenced by the map projection chosen in a geographic information system (GIS) for data analysis. Different methods of projection will distort spatial data in different ways, so it is important to choose a projection that meets the needs of the research. The large number of projections in use today and the lack of distortion comparison between the various types make selecting the most appropriate projection a difficult decision. The purpose of this study is to quantify and compare the amount of area distortion in animal home range estimations when projected into a number of projected coordinate systems in order to understand how the chosen projection influences analysis. The objectives of this research are accomplished by analyzing the tracking data of four species from different regions in North and South America. The home range of each individual from the four species datasets is calculated using the Characteristic Hull Polygon method for home range estimation and then projected into eight projected coordinate systems of various scales and projection type, including equal area, conformal, equidistant, and compromise projections. A continental Albers Equal Area projection is then used as a baseline area for the calculation of a distortion measurement ratio and magnitude of distortion statistic. The distortion measurement ratio and magnitude calculations provide a measurement of the quantity of area distortion caused by a projection. Results show the amount distortion associated with each type of projection method and how the amount of distortion changes for a projection based on geographic location. These findings show how the choice of map projection can have a large influence on data analysis and illustrate the importance of using an appropriate PCS for the needs of a given study. Distorted perceptions can influence decision-making, so it is important to recognize how a map projection can influence the analysis and interpretation of spatial data.
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Li, Yong 1965 May 3. "A high speed optical surface coordinate measurement system and its applications to dynamic measurements /." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=36639.
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Currently there is no standard whole-field methodology to measure the transient out-of-plane deformation of a surface under dynamic events. In this work, a whole-field high-speed optical surface measurement system has been developed, which yields absolute Cartesian coordinates (xyz) as measurement results. A high-speed digital camera coupled with the grating projection and Fourier transform is used to measure 3D surface deformations with the maximum sampling rate up to 1000 Hz and the exposure time of each frame up to 50 musec. A calibration technique has been utilized to convert the direct measurable values---phase, phi, and image indices (i, j)---into 3D Cartesian coordinates (xyz). In addition, all Cartesian coordinates are with respect to a fixed coordinate system, which is virtually associated with the sensor head. Therefore, the rigid body movements (rotation and translation) of the surface can be detected. The measurement accuracy +/-50 mum is verified with several tests by using standard objects.The dynamic surface deformation during polymer membrane inflation tests is investigated by using the proposed optical measurement system. Effects of various factors, such as the temperature and the airflow rate, are studied. Regarding the characterization of material constants by using the bubble inflation technique, the potential problems, which are caused by ignoring the nonuniformities of temperature distribution and the thermo-warping, have been studied.
A finite-element model, which can account for the nonuniformities of temperature distribution and the thermo-warping, has been employed to simulate the inflation deformation. A more accurate way to characterize the material constants is accomplished by combining the optical measurement system and a finite-element model that can account for the nonuniformities of the temperature distribution and the thermo-warping.
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Li, Yong. "A high speed optical surface coordinate measurement system and its applications to dynamic measurements." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0029/NQ64605.pdf.
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Gustavsson, Per, and Erica Gavefalk. "Design and evaluation of a system that coordinate clients to use the same server." Thesis, Linköpings universitet, Institutionen för datavetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-138420.
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This thesis present a system which examine when clients should select a new server to maximize the number of packets received with the fewest number of server selections. The ratio between the number of packets received and the number of server selections should therefore be as high as possible. To help minimize the number of server selections, the system should be adaptive if the conditions would change. We construct a server selection mechanism which guarantees agreement between clients when called upon by the system. Furthermore, four policies have been created for when the mechanism is to be called. The purpose of this is to find out when and how it is best to switch server and how they can adapt to varying connection failure rates between server and clients. We evaluate the system by running simulations concluding that the policy we call on demand is best, which calls the server selection mechanism when clients have no connection to the server. This policy is the best if the aim is to send as many packets as possible and that the server selection mechanism is called few times with adaption to varying connection failure rates. This would enable the system to provide information even if the conditions will change to the better or to the worse.
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Scott, Laurence Joseph. "Numerical modelling of tidal propagation in the Severn Estuary using a boundary-fitted coordinate system." Thesis, University of Salford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360436.
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Backeberg, Bjorn Christoph. "Modelling the mesoscale variability in the greater Agulhas Current system using hybrid coordinate Ocean model." Doctoral thesis, University of Cape Town, 2009. http://hdl.handle.net/11427/6458.
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The ocean circulation dynamics in the greater Agulhas Current system are dominated by mesoscale variability, which is highly non-linear, and therefore difficult to measure and simulate accurately. Moreover, the shedding of Agulhas rings from the retroflection south of Africa, which is the dominant mechanism by which warm and saline water flows from the Indian into the Atlantic Ocean, is thought to be a crucial component of the thermohaline circulation. With the goal of providing an accurate simulation of the greater Agulhas Current system, and in particular its mesoscale variability, a high resolution Hybrid Coordinate Ocean Model is set up in a nested configuration. In two 11 year simulation experiments, the effect of a higher order momentum advection scheme on the simulated ocean dynamics is tested and evaluated against available satellite observations and in-situ measurements. Quantitative analyses and model validation methods are developed to objectively evaluate the simulation experiments. The resultant skewness analyses and spatial variograms are objective measures for assessing the model simulation and additionally provide new insights on the mesoscale dynamics of the greater Agulhas Current system. A 4th order momentum advection scheme is shown to significantly improve the simulation of the region, in particular the dynamics of the southern Agulhas Current and the retroflection are greatly improved. From the analyses of the two model simulations in conjunction with satellite observations and in-situ measurements, it is found that the Indo-Atlantic inter-ocean exchange, and the shedding of Agulhas rings from the retroflection, is sensitive to the strength of the Agulhas Current, which in turn is influenced by the flow dynamics in the Mozambique Channel and south of Madagascar. Mesoscale eddies drifting from these source regions to the Agulhas Current play an important role, and the connection between the Agulhas Current and the respective source regions provides a link to large-scale variability in the Indian Ocean, which in turn is related to interannual modes of variability such as the Indian Ocean Dipole and El NiÑo Southern Oscillation.
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Terneux, Efrén Andrés Estrella. "Design of an Algorithm for Aircraft Detection and Tracking with a Multi-coordinate VAUDEO System." Thesis, Blekinge Tekniska Högskola, Institutionen för tillämpad signalbehandling, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-2633.
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The combination of a video camera with an acoustic vector sensor (AVS) opens new possibilities in environment awareness applications. The goal of this thesis is the design of an algorithm for detection and tracking of low-flying aircraft using a multi-coordinate VAUDEO system. A commercial webcam placed in line with an AVS in a ground array are used to record real low-flying aircraft data at Teuge international airport. Each frame, the algorithm analyzes a matrix of three orthogonal acoustic particle velocity signals and one acoustic pressure signal using the Singular Value Decomposition to estimate the Direction of Arrival, DoA of propeller aircraft sound. The DoA data is then applied to a Kalman filter and its output is used later on to narrow the region of video frame processed. Background subtraction is applied followed by a Gaussian-weighted intensity mask to assign high priority to moving objects which are closer to the sound source estimated position. The output is applied to another Kalman filter to improve the accuracy of the aircraft location estimation. The performance evaluation of the algorithm proved that it is comparable to the performances of state-of-the-art video alone based algorithms. In conclusion, the combination of video and directional audio increases the accuracy of propeller aircraft detection and tracking comparing to reported previous work using audio alone.+593 980826278
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Kopeček, Tomáš. "Nalezení fyzické pozice stanice v síti Internet." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218230.
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In this thesis I focus on finding the position of computers on the Internet. This need for locating computers originated in the last several years through the creation of overlay networks. For this activity there are many algorithms. This paper describes the King method that estimated the distance between communicating stations by using the domain name system. The aim of this work is to verify the accuracy of the King method in experimental PlanetLab network. This network provides access for more than 1000 stations worldwide.
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Lee, Joo-Kiong. "Radiowave propagation over an irregular terrain using the parabolic equation method in a curvilinear coordinate system." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1995. http://handle.dtic.mil/100.2/ADA297694.
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Flötotto, Julia. "A coordinate system associated to a point cloud issued from a manifold : definition, properties and applications." Nice, 2003. http://www.theses.fr/2003NICE4040.
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Dans de nombreux domaines d'applications, une variété plongée dans l'espace euclidien est souvent représentée par un échantillon de points. Nous définissons dans cette thèse un système de coordonnées associé à un tel échantillon sur la variété qui généralise les coordonnées naturelles définies par Sibson. Nous exhibons ses propriétés mathématiques fondamentales ainsi que son application à l'interpolation d'une fonction définie sur la variété. Nous introduisons la notion d'atlas de Voronoi͏̈, défini comme un ensemble de cellules approximant le diagramme de Voronoi͏̈ restreint à la variété et montrons son application à la reconstruction de surface et au remaillage. Enfin, nous étendons les propriétés des coordonnées naturelles aux diagrammes de puissance et proposons une synthèse des méthodes d'interpolation par coordonnées naturelles. Cette dernière détaille des preuves omises dans les articles originauxSurfaces and manifolds represented by a set of discrete points are encountered in various application areas. In this thesis, we define a coordinate system on the manifold associated to such a point set which is a generalization of Sibson's natural neighbor coordinates. We show its fundamental mathematical properties as well as its application to scattered data interpolation on manifolds. Furthermore, we introduce the notion of Voronoi atlas defined as a collection of Voronoi cells that approximate the Voronoi diagram restricted to the manifold. We describe its application in surface reconstruction and re-meshing. In addition, we show the basic properties of natural neighbor coordinates in power diagrams and we survey the interpolation methods based on natural neighbor coordinates. This survey details some proofs that are omitted in the original papers
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Manat, Namith N. "System for Tracking of Surgical Tools and Assessment of Surgical Skills Using Continuously Adaptive Mean Shift Methodology." VCU Scholars Compass, 2005. http://scholarscompass.vcu.edu/etd_retro/56.
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A tracking system that serves as a tool for tracking the movement of surgical instruments has been developed. The system tracks color markers on the surgical instruments. The Continuously Adaptive Mean Shift (CAMSHIFT) methodology was employed for tool tracking and a total distance traversed by the surgical instrument of interest was calculated. Two cameras were used to record the motion of the tool and the software developed was used to track the movement of markers on the tools over subsequent frames. The information thus derived from the two views of cameras was used to calculate the three dimensional coordinates of the location of the marker on the instrument and subsequently the distance traversed. MATLAB, which is a commercial software package, was used to implement the tool tracking algorithm and for developing the GUI (Graphic User Interface). Data was collected using Commercial off the shelf (COTS) camera hardware and processing was done on a 2.2 GHz, 512 MB RAM Intel Pentium 4 computer.
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MIYABO, Susumu, Toru NAKAMURA, Yasushi ISHII, Toshihiro MISAWA, Joan Dae LEE, Hisatoshi MAEDA, 進. 宮保, et al. "極座標による心筋Tｌ-201Bull's-eye表示の試み." 日本核医学会, 1988. http://hdl.handle.net/2237/19427.
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Mani, Saandeep. "In Vitro Biomechanical Characterization of Tibiofemoral Rotations and Translations Following Distal Bony Realignment." University of Akron / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=akron1280155331.
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Kaden, Roman, Harald Rasche, and Frieder Tonn. "Orientierung eines untertägigen Polygonzugnetzes im Lagebezug ETRS89/UTM." Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2016. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-206654.
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Im Rahmen einer Diplomarbeit wurden 2015 die untertägigen Polygonzugnetze der Gruben Unterbreizbach/Merkers der K+S KALI GmbH im Lagebezug ETRS89/UTM neu orientiert und Ergebnisse verschiedener Messepochen ausgeglichen. Für die Schaffung eines weiteren Anschlusspunktes erfolgten zur Koordinatenübertragung im Schacht Merkers 2 eine mechanische Schachtlotung und eine Steilschachtmessung nach dem Verfahren von Mecke/Ackermann aus dem Jahr 2002. Die Methoden werden gegenübergestellt und die erreichten Genauigkeiten diskutiertWithin the framework of a diploma thesis the underground mining coordinate system of Unterbreizbach/Merkers K+S KALI GmbH became reorientated in the reference system ETRS89/UTM with an adjustment of results from different ages of measurement. For the development of a further termination point a mechanical shaft plumbing and a steep shaft measurement according to Mecke/Ackermann from 2002 took place. The methods will be compared followed by a discussion of the reached accuracies
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Volakos, Nikolaos Panagiotou. "Numerical modelling of wind-induced circulation and pollution transport in the Thermaikos Gulf using a curvilinear coordinate system." Thesis, University of Salford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249011.
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George, Douglas B. (Douglas Brooks) Carleton University Dissertation Engineering Electrical. "A computer-driven astronomical telescope guidance and control system with superimposed star field and celestial coordinate grahics display." Ottawa, 1987.
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Magnusson, Linus. "Development and validation of a new mass-consistent model using terraininfluenced coordinates." Thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-303865.
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Simulations of the wind climate in complex terrain may be useful in many cases, e.g. for wind energy mapping. In this study a new mass-consistent model (MCM), the λ-model, was developed and the ability of the model was examined. In the model an initial wind field is adjusted to fulfill the requirement of being non-divergent at all points. The advance of the λ- model compared with previous MCM:s is the use of a terrain-influenced coordinate system. Except the wind field, the model parameters include constants α, one for each direction. Those constants have no obvious physical meaning and have to be determined empirically. To determine the ability and quality of the λ-model, the results were compared with results from the mesoscale MIUU-model. Firstly, comparisons were made for a Gauss-shaped hill, to find situations which are not caught by the λ-model, e.g. wakes and thermal effects. During daytime the results from the λ-model were good but the model fails during nighttime. From the comparisons between the models the importance of the α-constants were studied. Secondly, comparisons between the models were made for real terrain. Wind data from the MIUU-model with resolution 5 km was used as input data and was interpolated to a 1 km grid and made non-divergent by the λ-model. To study the quality of the results, they were compared with simulations from the MIUU-model with resolution 1 km. The results are quite accurate, after adjusting for a difference in mean wind speed between MIUU-model runs on 1km and 5 km resolution. Good results from the λ-model were reached if a climate average wind speed was calculated from several simulations with different wind directions. Especially if the mean wind speed for the domain in the λ-model was modified to the same level as in the MIUU 1 km. The λ-model may be a useful tool as the results were found to be reasonable good for many cases. But the user must be aware of situations when the model fails. Future studies could be done to investigate if the λ-model is useable for resolutions down to 100 meters.Sammanfattning av ”Utveckling och utvärdering av en ny ’Mass- Consistent Model’ med terränginfluerat koordinatsystem” Modellering av vindklimat i komplex terräng är användbart i många sammanhang, t ex vid vindkartering för vindenergi. I den här studien utvecklas och undersöks användbarheten av en sk. Mass-Consistent Model, λ-modellen. Modellen bygger på att ett initialt vindfält justeras för att uppfylla kontinuitetsekvationen i alla punkter. För att göra vindfältet divergensfritt används en metod som bygger på variationskalkyl. Fördelen med denna nya modell jämfört med tidigare är användandet av ett terränginfluerat koordinatsystem. I teorin för λ-modellen införs en parameter α. Då denna inte har någon självklar fysikalisk betydelse behöver den bestämmas empiriskt. För att undersöka kvalitén hos λ-modellen gjordes jämförelser med den mesoskaliga MIUU-modellen. Det första steget var att jämföra körningar över en Gaussformad kulle, detta för att jämföra modellerna och finna situationer som λ-modellen inte löser upp. Exempel på sådana är termiska effekter och vakar. Resultaten under dagtid var bra medan under nattetid var det stora skillnader mellan modellerna. Utifrån resultaten kunde betydelsen av α-parametern studeras. Nästa steg var att jämföra med verklig terräng. Detta gjordes för ett område i Norrbotten. Här användes vinddata från MIUU-modellen med upplösning 5 km som indata för att beräkna vinden på en skala 1 km. För att undersöka kvalitén hos λ-modellen användes data från MIUU-modellen med upplösning 1 km som jämförelse. Resultaten avseende vindvariationerna i terrängen är tillfredställande, dock med något för höga vindhastigheter i λ-modellen. Detta visade sig bero på för högre medelvind i MIUU 5 km än i MIUU 1 km. Jämförelse mellan modellerna gjordes även för Suorva-dalen i Lappland vilken omges av bergig terräng. Resultaten här var sämre avseende medelvindarna, men med bättre resultat avseende vindriktningarna. Bra resultat för λ-modellen nåddes då resultat från flera simuleringar slogs samman till ett medelvärde. Framförallt blev resultatet bra då medelvinden justerades till samma nivå som MIUU 1 km. Sammanfattningsvis kan sägas att resultaten från λ-modellen är rimliga i många situationer men att det är viktigt att veta i vilka situationer den inte fungerar. Framtida undersökningar bör göras för att undersöka om modellen är användbar för upplösningar ner till ca 100 meter.
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Liu, Chia-Sheng, and 劉佳昇. "Coordinate System and Warp for Drosophila Brain." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/13807361882991690200.
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碩士國立交通大學
多媒體工程研究所
97
We study the problem of warping Drosophila brains to a normalized fly brain. In this thesis, we define a coordinate system for the Drosophila brain. Based on the coordinate system, we define a size-normalized brain. Every fly brain is normalized before warping. The warping is based on the feature points determined by the neuropils in the brain. Experimental results show that a brain can be warped to the target brain with the internal structures and the hull of the brain almost aligned.
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Liao, Yuan-Hsien, and 廖元賢. "Moving Coordinate System of Erosional Sublayer Flows." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/11216713633492962026.
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碩士國立暨南國際大學
土木工程學系
98
According to the manual definition of conversation of water and soil, Landslides is the mixtures of such materials as mud, sand and water. Under the gravitational form and redistribution of internal stress states. Due to change of geological and topological coordinate, the materials are transported over complex topography. We aim to extends the concept of Fracarrolo & Capart[2002] and combine the characteristic of Unified Coordinate System to establish a new Sub-layer model on general topography including corrosion and accumulation in this thesis. Its upper layer is water, the middle is mixed fluid of water and solid grit, and the bottom bed is formed by grit. In the course of flow of sub-layer flow there will be unceasing phenomena of corrosion and accumulation on the bottom bed and mixed fluid flow these phenomena are taken into account in a Cartesian Coordinates System in Fracarrolo & Capart [2002]. We try to reformulate the result into variable coordinates. The coordinate are chosen to coincide with the bottom bed, and they change along with the time due to corrosion and accumulation. The in variable coordinates sticks on the variable bottom bed, and is normal to the direction of the bottom bed. A set of depth integrated mass and momentum conservation laws are derived. To investigate the key feature of this model we applied the non-oscillation central (NOC) finite volume scheme with respect to a dam-brake problem. The evolution of the corrosive/accumulative based surface is obtained, which were quantitatively compared with respect to different density ratio s, volume fraction as well as the thickness of the mixture layer .
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Zhu, Zi Li, and 朱自立. "A novel automatic coordinate synchronizing fixturing system." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/22921418764651912213.
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Tai, Cheng-Lin, and 戴呈霖. "Coordinate Measurement System by Using Two Cameras." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/47588806423838680879.
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碩士國立成功大學
機械工程學系碩博士班
92
This paper presents a new method of coordinate measurement system by using two cameras. Instead of pinhole model, the parameters of this system are calibrated by using skew ray tracing method based on Snell’s law, and the model of coordinate measurement is built utilizing reversal skew ray tracing to trace light rays from image plane to 3-D world. Skew ray tracing is a theory derived from a 4×4 homogeneous coordinate transformation matrix and the Snell’s law of the geometrical optics. It offers a mathematical model of the direction of refracted (reflected) ray and the position of incident point of light rays while crossing medium boundary surfaces. Therefore, the light rays can be traced from the light source crossing optical elements to the image plane. And because of the reversibility of geometrical optics, the light rays can be also traced from image plane to 3-D world. Thus, the coordinates in 3-D world can be measured by two images took from two cameras using reversal skew ray tracing method. Camera calibration is a crucial problem for coordinate measurement. However, all existing methods of camera calibration are developed based on pinhole model, an approximation algorithm against to Snell’s law. Thus, it is impossible to obtain an accurate method of camera calibration by using a mathematical pinhole model. This paper models the geometric relationship between 2-D images and 3-D world by using skew ray tracing theory to calibrate five intrinsic parameters and six extrinsic parameters. It is not an abstract approximation algorithm but an absolutely physically correct calibration method. Experimental results have shown the accuracy of the proposed system.
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Hong, Zi Xiu, and 洪子修. "The research on coordinate synchronizing fixturing system." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/65770153480850264449.
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Cheng, Chao-Ming, and 鄭兆銘. "Exploring Parallel Coordinate System and Statistical Application." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/21205977680308878990.
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Zheng, Zhao-Ming, and 鄭兆銘. "Exploring Parallel Coordinate System and Statistical Application." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/97631236941589897275.
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Chang, Yu-Luw, and 張友倫. "The Development of the Intelligent Coordinate Measuring System." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/76427181148423716962.
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碩士崑山科技大學
機械工程研究所
96
This dissertation is to research how to use the Coordinate Measuring System instrument properly in the Quality Control and Production Control. The main aims are: 1. To choose some drawings from AutoCAD diagram with important dimension and geometric common difference in each processing stage to make the inspection sheet for the Coordinate Measuring System. To set up the inspection standard in order to avoid excerpting the wrong values during inspect procedure. To install the transducer on the three axis of the Coordinate Measuring System, check the head coordinate and read from transducer to convert the signal from analog to digital and then forward to encoder. To compare the checking value with the standard inspection sheet through the NI Montion card and judge the result. 2. Choosing the information from the drawing then make plan for inspect path and CNC code. 3. Using EXCEL trial balance sheet to complete the program for all important dimension of design in each processing stage、to produce each drawing form AutoCAD and EXCEL VBA、Engineering Control sheet、inspection sheet, to avoid the huge loss happens on the process changed by the designer, goods delayed shipment for making mistake or missing any value and parts reworked or obsolescence. To integrate above three aims under AutoCAD environment and build The Intelligent Coordinate Measuring System, further to convert related dimension and common difference of drawing、the inspection report、the experiences of design modification to Drawing Object and fit it in the PDM (Product Data Management). To ensure the PDM system will control properly the process of product design modification then improve the percentage of product development, shortage the working days and promote the competition to move forward the goal of SEA (Sales Engineering Automation).
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Chang, Tsung-Tai, and 張驄泰. "Sharing Document Management System Coordinate with Knowledge Management." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/51844751369388420285.
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碩士國立海洋大學
系統工程暨造船學系
90
A proverbial saying, 「Knowledge Is Power」, which is familiar to ear from childhood. Now, it comes true again and it is still changeless even though passes through the time-test. After the 3rd industry revolution, the economy type has been changed to national economy. National games are starting, 「Knowledge」is the key that makes economy being succeeded. A great mass fervor has been raised from government organization、enterprise to individual and a great favor caused by Internet mushroomed. Community activities become frequently in network and from social civic organizations to technical professional organizations are being community gradually. The same purpose makes community, and the distribution of community becomes far less by Internet. Knowledge sharing and connection of people are the main items in those community activities. We will use WebDAV that is a kind of protocol, which is a developing extensional specification of HTTP in this paper and use its methods which is supported to establish cooperation services based on working in network. We also collocate the applications about XML techniques and the basic definition and working target of community and team to set up a sharing document management system works in network like working in true world which the system can make the community work more efficient.
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Hor, Chiou-Yi, and 何秋誼. "Study of Calibration System of Coordinate Measuring Machine." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/06296961731318529357.
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碩士國立臺灣大學
機械工程學系
85
This paper describes the development of efficient and cost- efficientself-calibration method for coordinate measuring machines. A new designing and manufacturing method for ball- plate is proposed here.In order to calculate 21 volumetric errors,a new computational alothorithm based on 3D volumetric length uncertainty is also presented. The software compensaton scheme for CMM is employed to maintian the accuracy of the CMM.It has been proved to maintain the accurracy performance of CMM in very satisfied condition.
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Ji, Hong. "Development of a novel optical contact probing system for nano-CMM." 2008. http://arrow.unisa.edu.au:8081/1959.8/79344.
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This thesis describes the development and the verification of a novel micro probe system for high accurancy downscaled Coordinate Measuring Machines (CMMs).Thesis (PhD)--University of South Australia, 2008.
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Cheng, Ssu-Min, and 鄭斯民. "The Improvement of Coordinate Parameters for Global Position SystemThe Improvement of Coordinate Parameters for Global Position System." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/86358452394840872553.
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碩士國立高雄應用科技大學
電子工程系
99
GPS positioning in Taiwan is not easy because of the topography and urban density issues. Using GPS positioning and digital maps, it always takes lots of time to locate the position. If the traffic information could be transmitted to other vehicles while driving, the application of GPS could be enlarged. In this thesis, we use add direction and speed parameter of coordinates for AIS concept which is applied to improve the accuracy of the Global Positioning System (GPS). The research send the information to the positioned target by Bluetooth, and keep calculating the target coordinate in the 2-dimension to meet the criteria. As the results, the target coordinate could be well positioned in the narrow topography by using this methodology, and diversity of coordinate information.
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Cheng, Cheng-Te, and 鄭正德. "Boundary-Fitted Coordinate System Applied to a Surge Model." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/80535586289294973594.
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碩士國立臺灣大學
土木工程學研究所
90
BOUNDARY-FITTED COORDINATE SYSTEM APPLIED TO A STORM SURGE MODEL CHENG-TE CHENG ABSTRACT Taiwan is located between sub-tropic and tropic regions. There are about three or four typhoons attacked Taiwan every year. A typhoon carries a large amount of water, and strong wind. It causes many life casualties and property loses. On the typhoon path, coastal water level rises compared with original tide. It is important to forecast storm surge at river mouth section and coastal areas. A storm surge is strongly needed. Astronomic tide is usually obtained by harmonic analysis method. At least a year-long hourly tidal field data of thirteen tidal stations in Taiwan are collected to analyze astronomical tides. Results of astronomic tidal analysis are verified. This research is based on FEMA forecast storm surge model developed by the Federal Emergency Management Agency,USA (1985). It assumes that typhoon is circly symmetrical in typhoon model, so as to obtain wind stress and distribution of pressure. The wind stresses and the radial barometric pressure gradient is the external force of the hydrodynamic model. However, the FEMA model is not applicable to physical domains of irregular shape. Based on FEMA model, a new numerical model is developed by employing a boundary-fitted coordinate system. It transforms an irregular plane into a rectangular, computation plane. The finite difference method with a predictor-corrector scheme is applied to momentum equation and continuity equation in the rectangular domain. Sea level departure from mean sea level is then calculated. To verify present storm surge model, a rectangular region is used to calculate storm surge and compared with results of FEMA model. To demonstrate applicability of present model, Hober typhoon(1996) and Xangsen typhoon(2000) are used as examples. Storm surges at Tamsumi , Keelung, Hwalien, Donss and Kaohsiung coastal regions are compared with field measurements. Present model shows reasonable forecast capability, but needs further improvement.
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Li, Guo-Cai, and 李國財. "A Scalable Sensor Network Using a Polar Coordinate System." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/39249677352623650421.
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碩士東海大學
資訊工程與科學系
95
Due to the quick development of chip design and antenna manufacturing techniques, wireless facilities, such as wireless sensors, have become significantly smaller and cheaper than before. Their usage has also consequently been widely enriched, such as in the areas of healthcare and forest monitoring. A wireless sensor network (WSN) is often used to monitor a specific environment for a specific purpose. However, how to effectively utilize the limited resources in a sensor, also in a WSN, is crucial. In a WSN, geographical information is usually employed to locate a node and its surroundings. In this article, we propose a system, named Relative Position for sensor Routing using Polar-coordinates (RP2) that deploys a polar coordinate system to identify sensor positions and route network packets. A sensor ID that carries geographical metadata can be helpful in positioning a sensor.
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Wu, Po-Wei, and 巫柏葳. "Use HTH Coordinate-System to Optimize Kinect Motion Recognition." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/g3hwz9.
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碩士中原大學
電機工程研究所
102
Abstract In this thesis, we propose a method to optimize the motion recognition of skeleton. We used horizontal-correction and smoothing to reduce the noise and to increase the accuracy of recognition. Moreover, we defined motion by coordinate system on human body to simplify the motion recogniztion and make it more efficiently. There are four steps in our thesis. The first step introduces structure of recognition system including depth measurement, the calculation of horizontal displacement, the optimization of skeletal noise and the definition of coordinate system on human body. The second step presents a method to decrease the horizontal error for Kinect. The horizontal displacement is obtained by using quadratic equation, which is derived from quadratic approximation method and the image depth value along z-axis. The third step presents the dealing of noise about slightly vibration of human body by Kinect SDK. In the fourth step, a novel method of coordinate system is adopted by setting up the coordinate on the human body which makes the recognition of image motion more easily and precisely. The main contributions of this thesis are: 1. Reduce the horizontal error of Kinect to improve the recognition of tinny motion. 2. Reduce the noise of tinny vibration. 3. Describe image motion more precisely by establishing the coordinate system on people. 4. Make a system to different people who different high. They can use the same coordinate system to recognition same motions.
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Cheng, Chia Wen, and 鄭嘉文. "System Software Development of micro/nano Coordinate Measuring Machines." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/89791666972004901388.
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碩士南台科技大學
化學工程與材枓工程系
95
In these days, the hardware of measurement has gotten lots of improvement. The demand on high precision is also gradually on the rise. Therefore, the test of measurement is highly emphasized. Now it is not easy to move the massive size of a Coordinate Measuring Machines(CMM). With the increasing of high precision, the price of the machine is getting higher. Therefore, the main purpose of the study is to develop a portable CMM with low cost and micro/nano precision to be used in the industry and research units. The CMM software is written for Borland C++ Builder computer language.The program in the research is developed by using the technique of the object-oriented and the three dimensional graphics. With measurement theories applied, CMM software is to establish an easy-operated measurement environment and contains some basic measurement functions such as basic elements ( including point, line, circle, width, sphere, cylinder/hole, plane and central line, etc.) Besides, by using basic elements, the software constructs geometric relativity (distance, degree, and geometric tolerance) and the results are visualized by using the computer graphics library.
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Huang, De-Shao, and 黃德劭. "Numerical simulation of turbulent flow using curvilinear coordinate system." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/20583503291721175297.
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Huang, De-Shau, and 黃德劭. "Numerical Simulation of Turbulent Flow Using Curvilinear Coordinate System." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/37739017233343968069.
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碩士國立臺灣大學
機械工程研究所
81
The complex geometries and turbulent flow are usually encountered in engineering application , for example , kindey- shape combustor , diffuser e.t.c. Numerical methods predicting fluid flow are restricted by the complex geometries , because it is difficult to treat boundary of irregular configurations . Therefore , nonorthogonal coordinate system has been developed rapidly . The velocity components can be classified into the contravariant and covariant velocities . Numerical method based on contravariant or covariant velocity can solve the fluid flow in complex geometries . The present study using covariant velocity components at nonorthogonal curvilinear coordinate system predicts turbulent flow in a complex configuration . The results show that the numerical method predicts well at Cartesian curvilinear coordinate system . But ,the convergence of mass is investigated further at Cylindrical curvilinear coordinate system.
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Tsai, Shang-Lin, and 蔡尚麟. "Simulation System of the CIE Coordinate for White LEDs." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/k287yd.
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碩士國立虎尾科技大學
光電與材料科技研究所
102
The industry''s production of white LED multi-use dispensing packaging process, the yellow fluorescent powder mixed plastic packaging, within a point of reflection into the bracket so that the package plastic lid covering the blue chips to produce white light, fluorescent powder to be controlled in this way and the proportion of plastic material, to achieve the required brightness white LED production, CIE address and color temperature. In order to meet customer needs white LED brightness, CIE address and color temperature requirements, the paper will be designed to simulate a different band with yellow fluorescent pink plastic timber with a blue chip of the proportion of white LED brightness, CIE coordinates and color temperature of the system to produce . You can speed up the pace of new product development and reduce the development of new products for fluorescent powder and plastic material consumption and loss of manpower hours to reach the goal of the company cost down.
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Cheng, Yung-Cheng, and 鄭詠成. "Camera-Guided Coordinate System Alignment for Neuromagnetic Source Estimation." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/10482472811741449981.
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碩士國立陽明大學
衛生資訊與決策研究所
93
Coordinate system alignment is usually performed by localizing a set of coils attached to the subject's head in both the coordinate systems of the head and a whole-head neuromagnetometer device. This conventional approach may cause instability of neuronal source localization when the estimated coil positions are not stable or when the coils are not tightly attached. This article presents a new coordinate system alignment technique without using coils. Instead, the proposed method utilizes a calibrated camera to monitor feature points attached to the subject's face. Coordinate system alignment is then achieved by determining the head pose in neuromagnetometer device coordinate system. According to the phantom experiments, we demonstrate the feasibility, stability, and accuracy of the proposed camera-guided alignment method.