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Tesi sul tema "Coordinate"
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1
Carbonari, Giulia. "Coordinate isoterme". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/10116/.
Testo completoAbstract (sommario):
Questa tesi si propone di verificare l'esistenza di coordinate isoterme su una superficie. Le coordinate isoterme danno localmente una mappa conforme da una varietà riemanniana bidimensionale al piano Euclideo. Se la superficie è orientabile, allora si può dare un atlante di carte isoterme, cioè le cui coordinate associate siano isoterme. Queste coordinate esistono a patto che vengano soddisfatte certe condizioni. Il risultato nelle classi di Holder è dovuto a Korn e Lichtensten. Chern ha notevolmente semplificato la loro dimostrazione.
2
Andrei, Octavian. "3D affine coordinate transformations". Thesis, KTH, Geodesi och satellitpositionering, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-199846.
Testo completoAbstract (sommario):
This thesis investigates the three-dimensional (3D) coordinate transformation from a globalgeocentric coordinate system to a national terrestrial coordinate system. Numerical studies arecarried out using the Swedish geodetic data SWEREF 93 and RT90/RH70. Based on theHelmert transformation model with 7-parameters, two new models have been studied: firstly ageneral 3D affine transformation model has been developed using 9-parameters (threetranslations, three rotations and three scale factors) and secondly the model with 8-parameters(three translations, three rotations and two scale factors) has been derived. To estimate the 3Dtransformation parameters from given coordinates in the two systems, the linearizedobservation equations were derived. Numerical tests were carried out using a local (North,East, Up) topocentric coordinate system derived from the given global geocentric system. Thetransformation parameters and the residuals of the coordinates of the common points werecomputed. The investigation shows the horizontal scale factor is significantly different by thevertical scale factor. The residuals of the control points were expressed in a separate (North,East, Up) coordinate system for each control point. Some investigations on the weightingprocess between horizontal and vertical components were also carried out, and an optimalweighting model was derived in order to reduce the residuals in horizontal componentswithout changing the coordinates.
3
Hodgson, Timothy Lewis. "Coordinate systems in visual orienting". Thesis, Birkbeck (University of London), 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338843.
Testo completo
4
De, Brito e. Cunha Goncalo. "Incremental parsing of coordinate constructions". Thesis, University of Sussex, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283149.
Testo completo
5
Fidalgo-Marijuan, Arkaitz. "Normal-Coordinate Structural Decomposition Engine". Revista de Química, 2017. http://repositorio.pucp.edu.pe/index/handle/123456789/123959.
Testo completo
6
Muadz, Husni. "Coordinate structures: A planar representation". Diss., The University of Arizona, 1991. http://hdl.handle.net/10150/185527.
Testo completoAbstract (sommario):
In this dissertation, I pursue the idea suggested in Chomsky (1982) that coordination should be treated as an object with three dimensions. I propose a planar model to account for the longstanding problems of coordination. The types of phenomena studied here are related to Phrasal Coordinations, Gapping, Verb Phrase Deletion, and Right-Node Raising. I claim that a coordinate sentence, unlike a simple one, is too expansive a domain for the Principles of Universal Grammar (UG) to hold. The relevant domain for the application of UG principles is each separate "component part" of the coordinate sentence. The "component parts", referred to here as planes, are elements of the coordinate sentence which have the same formal properties as simple sentences. Thus, under the planar model, a coordinate sentence has a number of "simple sentences" or planes. Intuitively, a plane, like a simple sentence, can be thought of as a complete functional complex in which all grammatical functions compatible with its head are realized. Given this, I argue that the well-formedness of a coordinate structure depends on whether or not each of its planes obeys the principles of UG. The planar model adopts the idea that conjuncts or disjuncts in coordination are based generated at D-Structure. It is claimed that no deletions or empty nodes exists in any type of coordinate structures. I show that the absence of some elements in coordination, e.g. a verb in Gapping, is a phonetic phenomenon, which occurs only as a result of the linearization process. At the other levels of representation, such as D-Structure, S-Structure, and Logical Form, all materials are present in each plane; thus, under the planar model, we do not need to invoke a deletion rule or the existence of some empty node in those levels of representation. Given this model, I show that the principles and parameters approach of GB can in fact give a unified treatment of coordination. I demonstrate that this can be done without recourse to construction-specific stipulation.
7
Iannuzzi, Alessandra. "Introduzione di coordinate nei piani affini". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15835/.
Testo completoAbstract (sommario):
Si considera il classico problema della coordinatizzazione, nell'ambito dei piani affini: dato un piano affine sintetico sotto quali ipotesi sintetiche possiamo costruire un piano affine su un corpo, ad esso isomorfo? Abbiamo presentato un'esposizione di tale problema ed una sua soluzione, seguendo l'impostazione data da R. Lingenberg e A. Bauer. Abbiamo esposto le ipotesi sotto forma di validità di teoremi di chiusura, sotto forma di esistenza di particolari collineazioni o di alcune loro specifiche proprietà ed abbiamo esplicitato l'equivalenza tra queste ipotesi.
8
Bronder, Axel Viking. "Visualization of a SWEPOS Coordinate Analysis". Thesis, KTH, Geoinformatik och Geodesi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-45986.
Testo completoAbstract (sommario):
Lantmäteriet, The Swedish Mapping, Cadastral and Land Registration Authority, is responsible for the operation and maintenance of SWEPOS and SWEREF99 (the Swedish official reference frame) and there-fore also responsible for control and verification of the data provided by the reference stations.Clas-Göran Persson at Lantmäteriet has created a new controlling procedure, including software, to analyze the position uncertainties of the SWEPOS stations using various statistical methods. The soft-ware evaluates the daily calculated coordinate data of the stations subsequently; it will not be installed directly on the actual stations. The primary goal is to study the stability of SWEPOS from a SWEREF 99 point of view, not to analyze SWEPOS real-time service. The controlling procedure is referred to as “the CGP Program”.The CGP Program is a toolbox of statistical methods created in MATLAB, determining standard devia-tion, correlation, distribution (outliers) and more. Its main purpose is to determine if the SWEPOS data consists of uniform uncorrelated normal distributed deviations, known as white noise, or not.The purpose of my Thesis is to; based on this new controlling procedure, create a graphical overview of the current status of the SWEPOS network for Lantmäteriet. Instead of making a thorough analysis of each station the maps created in this Thesis will visualize the outcome on an overall basis and identify the stations and areas of interest for further analysis.Together with representatives from Lantmäteriet we decided that three different map types where of interest. All the maps were to be based on SWEPOS data from 2010, analyzed by the CGP program, and visualized on a nationwide basis. They differ in their cartographic appearance and they all describe dif-ferent characteristics of the SWEPOS stations.Conclusions from the maps and the numerical analyzes: * There is a clear "winter effect", most obvious in the height coordinate. Removal of the snow-period results in lower standard deviations and fewer unwanted systematic effects. * The Northing coordinate has a slightly higher standard deviation than the Easting coordinate. The standard deviation in Height is around 50% larger than the horizontal standard deviation. * There is no evidence for physical movements, when comparing the official SWEREF 99 coordinates with the 2010 positions.
9
Zuzan, Harry. "Coordinate-free self-organizing feature maps". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ31913.pdf.
Testo completo
10
Ragan, Jennifer D. "A study of particular coordinate systems". Thesis, Wichita State University, 2011. http://hdl.handle.net/10057/3968.
Testo completoAbstract (sommario):
This thesis is a study of the properties and relationships between isothermal, harmonic
and characteristic coordinate systems. The proof of the existence of isothermal and
characteristic coordinates on a manifold which is a graph is given using the Uniformization
theorem. Equations of prescribed mean curvature are discussed and the relationship between
equations of minimal surface type and mean curvature type are shown. It is also proven that
the map from a domain parameterized by characteristic coordinates to the domain parameterized
by isothermal coordinates is quasiconformal.Thesis (M.S.)--Wichita State University, College of Liberal Arts and Sciences, Dept. of Mathematics and Statistics.
11
Russell, Graham. "Verbal ellipsis in English coordinate constructions". Thesis, University of Sussex, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328355.
Testo completo
12
Lin, Kevin K. (Kevin Kwei-yu) 1974. "Coordinate-independent computations on differential equations". Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/42798.
Testo completoAbstract (sommario):
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.Includes bibliographical references (v. 2, p. 512-514).
by Kevin K. Lin.
M.Eng.
13
Eriksson, Edvin. "Coordinate conversion for the Hough transform". Thesis, Uppsala universitet, Högenergifysik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-448782.
Testo completoAbstract (sommario):
This thesis attempts to develop a conversion algorithm between local coordinates in constituent detector modules and global coordinates encompassing the whole detector structure in a generic detector. The thesis is a part of preparatory work for studying the Hough Transform as a means of track reconstruction in the level-1 hardware trigger in the upgraded trigger and data acquisition (TDAQ) system in the phase 2 upgrade of the ATLAS detector at CERN. The upgrades being made are to withstand much more extreme conditions that come with the high-Luminosity Large Hadron Collider (HL-LHC). Two algorithms have been made and then implemented in Python scripts to test their feasibility and to compare them against each-other. The Rotation algorithm uses several rotations to correctly place the local coordinates in the global system. The second, the Shear algorithm, simplifies the process into two shears and one rotation, using the small angle approximation. Both algorithms need to be extended to work with more parts of the detector to be considered complete. Despite having lower maximum precision the second algorithm is considered the most promising attempt, since it is much less sensitive to the truncation error that results from working in an integer environment, which is a requirement for use in FPGAs.I denna uppsats görs ett försök att skapa en omvandlingsalgoritm mellan lokala koordinater i konstituerande detektormoduler och globala koordinater i hela detektorstrukturen för en generisk detektor. Uppsatsen är en del i förberedande arbete för att undersöka hur Houghtransformen kan användas för spårrekonstruktion i den hårdvarubaserade level-1 triggern i det uppgraderade trigger- och datainsamlingssystemet (TDAQ) i fas två-uppgraderingen av ATLAS detektorn vid CERN. Uppgraderingarna som görs är för att kunna utstå de mycket mer extrema förhållanden som medförs av högluminositetsuppgraderingen av Large Hadron Collider (HL-LHC). Två algoritmer har skapats och implementerats i Pythonskript för att testa genomförbarhet och för att jämföra med varandra. Rotationsalgoritmen använder ett antal rotationer för att korrekt placera ut de lokala koordinaterna i det globala systemet. Den andra, Skjuvalgortimen, förenklar processen till två skjuvningar och en rotation med hjälp av liten vinkel-approximationen. Båda algoritmerna behöver utökas för att fungera för fler delar av detektorn för att anses kompletta. Trots lägre maximal precision bedöms den andra algoritmen vara det mest lovande försöket, eftersom den är mycket mindre känslig för trunkeringsfelet som kommer av att arbeta i en heltalsmiljö, som är ett krav för FPGA-implementationen.
14
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.
Testo completoAbstract (sommario):
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
15
Botteghi, Marina. "Coordinate transformations in quantum gravity: the Schwarzschild black hole". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amslaurea.unibo.it/25684/.
Testo completoAbstract (sommario):
Una teoria coerente della gravità quantistica deve tenere conto dell'invarianza sotto trasformazioni di coordinate della teoria classica della Relatività Generale. Questa invarianza è principalmente considerata nella teoria linearizzata intorno a un dato background e, di conseguenza, le trasformazioni che vengono prese in considerazione sono deformazioni regolari dell'identità (diffeomorfismi). Tuttavia, le soluzioni delle equazioni di Einstein sono invarianti sotto trasformazioni più generali che dipendono dalle soluzioni stesse e non possono quindi essere ricondotte all'identità. Degli esempi sono le trasformazioni utilizzate per eliminare la singolarità di coordinate sull'orizzonte dello spazio-tempo di Schwarzschild e la trasformazione tra le coordinate di Schwarzschild e quelle armoniche. Considereremo in questo lavoro quest'ultima trasformazione nel contesto di una teoria quantistica. Descriveremo la geometria classica per mezzo di uno stato coerente quantistico e costruiremo degli stati coerenti "areali" e "armonici". Inoltre, definiremo l'operatore che realizza questa trasformazione classica di coordinate a livello quantistico e studieremo alcune delle sue caratteristiche.
16
Asli, Kilic. "Coordinate Systems For A Naval Virtual Environment". Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606465/index.pdf.
Testo completoAbstract (sommario):
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.
17
Chaves, Rui Pedro. "Coordinate structures constraint-based syntax-semantics processing". [S.l. : [Groningen : s.n.] ; University Library Groningen] [Host], 2007. http://irs.ub.rug.nl/ppn/306318679.
Testo completo
18
Laubitz, Zofia. "Coordinate and subordinate conjunctions in children's texts". Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75958.
Testo completoAbstract (sommario):
This thesis examines the use of conjunctions in texts, and in particular their function as a marker of text type. Children's acquisition of this aspect of conjunction usage is the main focus. An examination of the characteristics of various text types and the nature of coordinate and subordinate conjunctions in English serves as a framework within which the experimental evidence from adults and children (aged three to five) is considered. Three types of texts--conversation, narratives, and game explanations--were collected. It was found that both the types of conjunctions used and the frequency of conjunctions as a class vary according to text type; conjunctions are much more frequent in narratives and explanations than in conversation. It is shown here that pragmatic or cognitive factors cannot account for these findings; they can only be explained as a function of text type. The data from the children provide evidence that their conjunction usage is also constrained by text type, although their patterns of use are not exactly the same as the adults'. The results indicate that by age five children have a definite conception of text as a linguistic entity.
19
Kazana, Despina. "Agreement in modern Greek coordinate noun phrases". Thesis, University of Essex, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.542340.
Testo completo
20
Whitmore, Guy Matthew. "Coordinate reference systems for high precision geodesy". Thesis, University of Nottingham, 1994. http://eprints.nottingham.ac.uk/29037/.
Testo completoAbstract (sommario):
The advent of the Global Positioning System (GPS) meant that, for the first time, the geodetic and geophysical community has a tool for measurements on a global, continental and national scale. Global GPS networks are already competing with VLBI and SLR for the measurement of inter-continental baselines and earth rotation parameters. The development of the 'high accuracy fiducial GPS technique', as described in this thesis, has produced results comparable with mobile VLBI and SLR systems, but in shorter observational periods and at lower costs. Combined with global GPS networks, which have the potential to provide time-tagged fiducial station coordinates at the observational epochs, coordinates can be determined in a global reference frame. The results in this thesis, from a fiducial GPS campaign to monitor the vertical land movement at tide gauge sites in the UK, demonstrate that millimetric precisions and accuracies can be obtained in all three components over baselines of hundreds of kilometers. The combination of GPS with existing 2-d classical triangulation networks for mapping, engineering surveying and navigation has caused many problems, since the GPS observations are 3-d and of a superior quality. In Europe these problems have been overcome by the establishment of a new high precision reference framework, EUREF, based on fiducial GPS carried out in 1989. This thesis also describes the determination of coordinates for the UK EUREF stations and their application for geodetic control in Great Britain.
21
Tang, Wenxuan. "Coordinate transformation based electromagnetic design and applications". Thesis, Queen Mary, University of London, 2012. http://qmro.qmul.ac.uk/xmlui/handle/123456789/8695.
Testo completoAbstract (sommario):
The main objective of this thesis is to take one step forward to practical and realisable devices for antenna and microwave engineering, using the technique of discrete coordinate transformation (DCT), which is a practical implementation of the coordinate transformation method. During this thesis, the DCT technique was demonstrated and analysed from the theory, and was proved to provide an all-dielectric approach to design devices under certain conditions. Two schemes were proposed on how to use this technique in a practical design. The first one is to transform an existing device into a flattened profile, meanwhile maintaining its electromagnetic performance. As examples, a flat reflector and a flat lens were created from a parabolic reflector and a convex lens, respectively. The second scheme is to project the propagating paths of an electromagnetic wave, and then generate a distorted space according to the paths by engineering the electromagnetic properties of the media. In this scheme, two examples of application were presented: an undetectable antenna composed of a carpet cloak and a conducting cavity, and a broadband device which can extraordinarily enhance the transmission through a sub-wavelength aperture. Numerical simulations based on the Finite-Difference Time-Domain (FDTD) method were implemented to verify all the designs. Several specific configurations were employed in the modelling in order to simulate the DCT based devices more efficiently and precisely. Performance of these devices was validated and analysed, and the advantages and disadvantages of this technique were investigated. Realisation and fabrication methods i were also studied, and a prototype was designed, fabricated and measured. At the end, as an extension, a multiple discrete coordinate transformation method was proposed and presented. This multiple transformation was proved to effectively relax the limitation of the one-step transformation, and was used to design an all-dielectric thin absorber from a conventional pyramidal one for demonstration.
22
Donath, Maximillian, Felix Hennersdorf e Jan J. Weigand. "Recent highlights in mixed-coordinate oligophosphorus chemistry". Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-216365.
Testo completoAbstract (sommario):
This review aims to highlight and comprehensively summarize recent developments in the field of mixed-coordinate phosphorus chemistry. Particular attention is focused on the synthetic approaches to compounds containing at least two directly bonded phosphorus atoms in different coordination environments and their unexpected properties that are derived from spectroscopic and crystallographic data. Novel substance classes are discussed in order to supplement previous reviews about mixed-coordinate phosphorus compounds.
23
Legge, David. "Off-line programming of coordinate measuring machines". Licentiate thesis, Luleå tekniska universitet, 1996. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-16896.
Testo completoAbstract (sommario):
This thesis describes the state-of-the-art of off-line programming (OLP) for co-ordinate measuring machines (CMM's) and explores two important aspects of OLP systems; automatic generation of inspection programmes, probing points and movements between these, and data transfer from computer aided design (CAD). A method of generating inspection programmes using a 'feature' based definition of component geometry is described. This has been implemented as both free standing code and as a prototype, known as the Inspection Planning Assistant (IPA), which is based upon the robot simulation software GRASP. Current neutral data exchange formats such as IGES and DMIS are limited in their ability to transfer a toleranced 3D CAD model to OLP systems. The new standard for the exchange of product model data (STEP ISO 10303) offers the potential to resolve these problems. The scope and application of a STEP application protocol for inspection process planning is describedGodkänd; 1996; 20080328 (ysko)
24
WU, Shanshan. "Development of Conjugated Low-coordinate Organophosphorus Materials". Case Western Reserve University School of Graduate Studies / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=case1396603528.
Testo completo
25
Donath, Maximillian, Felix Hennersdorf e Jan J. Weigand. "Recent highlights in mixed-coordinate oligophosphorus chemistry". Royal Society of Chemistry, 2016. https://tud.qucosa.de/id/qucosa%3A30076.
Testo completoAbstract (sommario):
This review aims to highlight and comprehensively summarize recent developments in the field of mixed-coordinate phosphorus chemistry. Particular attention is focused on the synthetic approaches to compounds containing at least two directly bonded phosphorus atoms in different coordination environments and their unexpected properties that are derived from spectroscopic and crystallographic data. Novel substance classes are discussed in order to supplement previous reviews about mixed-coordinate phosphorus compounds.
26
Shragge, Jeffrey. "Wave-equation migration in generalized coordinate systems /". May be available electronically:, 2009. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.
Testo completo
27
Scully, Kevin J. "Finite element approximation over multiple coordinate systems /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2003. http://wwwlib.umi.com/cr/ucsd/fullcit?p3091314.
Testo completo
28
Lombardi, Marco. "Optimization of composite carriage for a coordinate measurement machine". Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-06112009-063037/.
Testo completo
29
Botteghi, Marina. "Coordinate di Painlevé-Gullstrand e buchi neri acustici". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/12057/.
Testo completoAbstract (sommario):
In questa tesi si introduce il concetto di buco nero acustico come l’analogo sonoro di ciò che rappresenta un buco nero in relatività generale.
In primo luogo verrà quindi illustrata la teoria della gravitazione di Einstein, per poi entrare nel dettaglio della soluzione di Schwarzschild e della nozione di buco nero.
In secondo luogo si dimostrerà come alcuni sistemi, i fluidi disomogenei in movimento, riescano a riprodurre effetti gravitazionali sotto certe condizioni. In particolare si
osserverà come il suono che si propaga in questi fluidi lo faccia lungo delle geodetiche determinate da una "metrica acustica" dipendente da velocità e densità del fluido, che verrà ricavata.
Ciò che permetterà di stabilire l’analogia sarà un’estensione analitica della soluzione di Schwarzschild, quella di Painlevé-Gullstrand: si potrà infatti identificare (formalmente) l’elemento di linea acustico con l’elemento di linea di Painlevé-Gullstrand.
Si troverà che portando la velocità del fluido a una velocità maggiore di quella del suono, nella zona supersonica le onde acustiche non potranno propagarsi controcorrente ma verranno
trascinate nella direzione opposta, come i raggi luminosi vengono trascinati verso la singolarità all’interno dell’orizzonte degli eventi di un buco nero.
La zona supersonica verrà quindi chiamata buco nero acustico.
30
Sourlier, David Michael. "Three dimensional feature independent bestfit in coordinate metrology /". Zürich : [s.n.], 1995. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=11319.
Testo completo
31
Erasmus, Daniel Jacobus Elardus. "Energy efficient coordinate establishment in wireless sensor networks". Pretoria : [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-01232006-161645.
Testo completoAbstract (sommario):
Thesis (M.Eng.)(Computer Engineering)-University of Pretoria, 2005.Title from opening screen (viewed March 22, 2006). Includes summaries in English and Afrikaans. Includes bibliographical references.
32
Hino, Shirley. "Synthesis and characterization of low-coordinate lead complexes /". For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2005. http://uclibs.org/PID/11984.
Testo completo
33
Lange, Regine Kerstin. "EEG-correlates of coordinate processing during intermanual transfer". [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=973225114.
Testo completo
34
Sozak, Ahmet. "Uncertainty Analysis Of Coordinate Measuring Machine (cmm) Measurements". Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/2/12608887/index.pdf.
Testo completoAbstract (sommario):
In this thesis, the measurement uncertainty of Coordinate Measuring Machine
(CMM) is analysed and software is designed to simulate this. Analysis begins with
the inspection of the measurement process and structure of the CMMs. After that,
error sources are defined with respect to their effects on the measurement and then an
error model is constructed to compensate these effects. In other words, systematic
part of geometric, kinematic and thermal errors are compensated with error
modelling. Kinematic and geometric error model is specific for the structure of
CMM under inspection. Also, a common orthogonal kinematic model is formed and
with using the laser error data of the CMM and error maps of the machine volume is
obtained. Afterwards, the models are compared with each other by taking the
difference and ratio.
The definition and compensation of the systematic errors leave the uncertainty
of measurements for analysing. Measurement uncertainty consists of the
uncompensated systematic errors and random errors. The other aim of the thesis is to
quantify these uncertainties with using the different methods and to inspect the
success of these methods. Uncertainty budgeting, comparison, statistical evaluation
by designing an experiments and simulation methods are examined and applied to
the CMM under inspection. In addition, Virtual CMM software is designed to simulate the task specific measurement uncertainty of circle, sphere and plane
without using the repeated measurements. Finally, the performance of the software, highly depending on the
mathematical modelling of machine volume, is tested by using actual measurements.
35
Kapanadze, David, Bert-Wolfgang Schulze e Ingo Witt. "Coordinate invariance of the cone algebra with asymptotics". Universität Potsdam, 2000. http://opus.kobv.de/ubp/volltexte/2008/2567/.
Testo completoAbstract (sommario):
The cone algebra with discrete asymptotics on a manifold with conical singularities is shown to be invariant under natural coordinate changes, where the symbol structure (i.e., the Fuchsian interior symbol, conormal symbols of all orders) follows a corresponding transformation rule.
36
Zhang, Xiangchao. "Free-form surface fitting for precision coordinate metrology". Thesis, University of Huddersfield, 2009. http://eprints.hud.ac.uk/id/eprint/7154/.
Testo completoAbstract (sommario):
Free-form surfaces are increasingly used in optical and mechanical devices due to their superior optical and aerodynamic properties. The form quality plays an essential role in the characteristics of a free-form component. In order to assess the form error, it is necessary to fit the measurement data with a nominal template or analytical function. This thesis focuses on investigating and developing appropriate fitting (matching) algorithms for different kinds of free-form surfaces. A new algorithm called the Structured Region Signature (SRS) is proposed to provide a rough matching between the data and template. SRS is a global generalised feature which represents the surface shape by a one dimensional function. The candidate location which occupies the most similar signature with the measurement data is considered to be a correct matching position. The fitted result is then refined to improve its accuracy and robustness. The widely used Iterative Closest Point technique suffers from a slow convergence rate and the local minimum problem. In this thesis the nominal template is reconstructed into a continuous representation using NURBS or radial basis functions if provided as a CAD model or a discrete-point set. The Levenberg-Marquardt algorithm is then applied to calculate the final result. The solution of the traditional algebraic fitting may be biased. The orthogonal distance fitting techniques can effectively overcome this problem. If the template function is explicit, the projection points can be updated simultaneously with the motion and shape parameters; whereas a nested approach is adopted to update the projection points and motion parameters alternately when the template is in a parametric form. A proper error metric should be employed according to the distribution of the measurement noise, so that the solution can be guaranteed robust and unbiased. Simulation and experimental results are presented to validate the developed algorithms and techniques.
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Kirkland, Eric Alan. "A nano coordinate machine for optical dimensional metrology". Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/16525.
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Moore, Ericka Kindred. "Low coordinate group 3 and lanthanide nitrogen complexes". Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/30763.
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Coy, Joanne. "The quantification of sampling error in coordinate measurement". Thesis, University of Warwick, 1991. http://wrap.warwick.ac.uk/35678/.
Testo completoAbstract (sommario):
This work was canied out between October 1986 and February 1989 at the School of Engineering, University of Warwick. The thesis begins with a review of the configurations of coordinate measuring machines in common use and an investigation into the types and magnitudes of the errors incurred due to various phenomena associated with the design, deformation or misalignment of the machine components. Some of the more significant of these errors are then measured and tabulated with a view to using them as a comparison to further work. Methods by which these errors can be rectified are then briefly reviewed. Chapter 2 is concerned with the inadequacies associated with current coordinate measuring machine software algorithm design. Measurement practices are reviewed and sources of inconsistency or potential misinterpretation are identified. Sampling error is singled out as being of particular significance. Chapter 3 reviews geometric element fitting procedures and the errors that can result from ill advised measuring practice. Systematic and random error analyses of the errors incurred in the estimates of geometric parameters are reviewed and an original investigation is performed into the errors incurred in parameters due to not considering all possible data (sampling error.) Chapter 4 presents an assessment of the nature of the problem of sampling error and outlines the way in which a robust algorithm for the formal quantification of these errors should be formulated. Chapter 5 then identifies the criteria that would maximise the implementability of an algorithm of this type. An algorithm satisfying these particular requirements is duly developed. Finally, chapter 6 consists of an investigation into the effect of probe geometry on the phenomenon of sampling errors. A method is then developed whereby the probe geometry that will minimise sampling error can be readily selected.
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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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Stevens, Mark A. M. Eng Massachusetts Institute of Technology. "Efficient coordinate descent for ranking with domination loss". Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/61592.
Testo completoAbstract (sommario):
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2010.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 37-38).
We define a new batch coordinate-descent ranking algorithm based on a domination loss, which is designed to rank a small number of positive examples above all negatives, with a large penalty on false positives. Its objective is to learn a linear ranking function for a query with labeled training examples in order to rank documents. The derived single-coordinate updates scale linearly with respect to the number of examples. We investigate a number of modifications to the basic algorithm, including regularization, layers of examples, and feature induction. The algorithm is tested on multiple datasets and problem settings, including Microsoft's LETOR dataset, the Corel image dataset, a Google image dataset, and Reuters RCV1. Specific results vary by problem and dataset, but the algorithm generally performed similarly to existing algorithms when rated by average precision and precision at top k. It does not train as quickly as online algorithms, but offers extensions to multiple layers, and perhaps most importantly, can be used to produce extremely sparse weight vectors. When trained with feature induction, it achieves similarly competitive performance but with much more compact models.
by Mark A. Stevens.
M.Eng.
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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.
Testo completoAbstract (sommario):
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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Takac, Martin. "Randomized coordinate descent methods for big data optimization". Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/9670.
Testo completoAbstract (sommario):
This thesis consists of 5 chapters. We develop new serial (Chapter 2), parallel (Chapter 3), distributed (Chapter 4) and primal-dual (Chapter 5) stochastic (randomized) coordinate descent methods, analyze their complexity and conduct numerical experiments on synthetic and real data of huge sizes (GBs/TBs of data, millions/billions of variables). In Chapter 2 we develop a randomized coordinate descent method for minimizing the sum of a smooth and a simple nonsmooth separable convex function and prove that it obtains an ε-accurate solution with probability at least 1 - p in at most O((n/ε) log(1/p)) iterations, where n is the number of blocks. This extends recent results of Nesterov [43], which cover the smooth case, to composite minimization, while at the same time improving the complexity by the factor of 4 and removing ε from the logarithmic term. More importantly, in contrast with the aforementioned work in which the author achieves the results by applying the method to a regularized version of the objective function with an unknown scaling factor, we show that this is not necessary, thus achieving first true iteration complexity bounds. For strongly convex functions the method converges linearly. In the smooth case we also allow for arbitrary probability vectors and non-Euclidean norms. Our analysis is also much simpler. In Chapter 3 we show that the randomized coordinate descent method developed in Chapter 2 can be accelerated by parallelization. The speedup, as compared to the serial method, and referring to the number of iterations needed to approximately solve the problem with high probability, is equal to the product of the number of processors and a natural and easily computable measure of separability of the smooth component of the objective function. In the worst case, when no degree of separability is present, there is no speedup; in the best case, when the problem is separable, the speedup is equal to the number of processors. Our analysis also works in the mode when the number of coordinates being updated at each iteration is random, which allows for modeling situations with variable (busy or unreliable) number of processors. We demonstrate numerically that the algorithm is able to solve huge-scale l1-regularized least squares problems with a billion variables. In Chapter 4 we extended coordinate descent into a distributed environment. We initially partition the coordinates (features or examples, based on the problem formulation) and assign each partition to a different node of a cluster. At every iteration, each node picks a random subset of the coordinates from those it owns, independently from the other computers, and in parallel computes and applies updates to the selected coordinates based on a simple closed-form formula. We give bounds on the number of iterations sufficient to approximately solve the problem with high probability, and show how it depends on the data and on the partitioning. We perform numerical experiments with a LASSO instance described by a 3TB matrix. Finally, in Chapter 5, we address the issue of using mini-batches in stochastic optimization of Support Vector Machines (SVMs). We show that the same quantity, the spectral norm of the data, controls the parallelization speedup obtained for both primal stochastic subgradient descent (SGD) and stochastic dual coordinate ascent (SCDA) methods and use it to derive novel variants of mini-batched (parallel) SDCA. Our guarantees for both methods are expressed in terms of the original nonsmooth primal problem based on the hinge-loss. Our results in Chapters 2 and 3 are cast for blocks (groups of coordinates) instead of coordinates, and hence the methods are better described as block coordinate descent methods. While the results in Chapters 4 and 5 are not formulated for blocks, they can be extended to this setting.
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Clarkson, Andrew C. "EPR Spectroscopy of Five-Coordinate Co(II) Complexes". Miami University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=miami15348548777196.
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Yang, Chuen-Chi 1968. "Effects of coordinate systems on color image processing". Thesis, The University of Arizona, 1992. http://hdl.handle.net/10150/291570.
Testo completoAbstract (sommario):
Many coordinate systems exist for processing digital color images. The goal of this work was to investigate how the choice of color coordinate system affects the image processing results. Specific issues addressed include (1) quantization error in coordinate transformations, (2) efficient techniques for luminance processing, (3) color space gamut, and (4) color edge detection. The effect of the color coordinate system in each of these areas is explored. Efficient algorithms are presented, along with experimental results using standard color images.
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Meng, Peng. "Hydrogen-bonded coordinate supramolecular networks toward functional materials". Thesis, Queensland University of Technology, 2021. https://eprints.qut.edu.au/211139/1/Peng_Meng_Thesis.pdf.
Testo completoAbstract (sommario):
This thesis examined crystal transformations enabled by competitive interactions between hydrogen bonding and covalent bonding, which is a step forward in understanding the interplay of multi-supramolecular interactions. A series of novel hydrogen bonded coordinate aggregates like macroscopic robust membrane, hydrogel/aerogel, novel supramolecular crystals based on melamine/cyanuric acid were created. Those newly developed aggregates demonstrate remarkable properties in mechanics, optics, photoluminescence, etc.
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Voltan, Alessandro. "Metrological performance verification of optical Coordinate Measuring Systems". Doctoral thesis, Università degli studi di Padova, 2010. http://hdl.handle.net/11577/3422359.
Testo completoAbstract (sommario):
At the state-of-the-art, the use of Coordinate Measuring Systems (CMS) for verification of geometrical and dimensional tolerances is becoming very wide-spread in industrial manufacturing. Traditional CMMs are generally equipped with mechanical probes, but recent trends are highlighting several limitations of tactile probes, due mainly to the increasing requirement of faster inspection and higher complexity in measurement tasks. In particular, due to the miniaturization of components and the employment of new delicate materials, the use of optical measurement systems is becoming more and more suited for industrial applications. Nevertheless, only a very small percentage of the potential applications for non contact measurement systems is established so far. The main obstacles to a large integration of optical sensors on CMMs can be found in the lack of international accepted specification and verification rules. International standards on performance verification of optical systems are still missing and the existing ones related to mechanical CMMs cannot be applied directly to non contact machines.
For these reasons, the main objective of the present work has been to contribute to the development of methods and artefacts for performance verification of non-contact measuring systems.
The thesis is composed of three main parts.
The first part deals with a study of the state-of-the-art in non contact Coordinate Metrology, including examples of measurements and test on own machines. After a first introductive Chapter related to the productive role of metrology in manufacturing processes, the second Chapter focuses on actual industrial requirements for quality assurance and related non-contact instruments review and classification.
The second part is committed to traceability of non contact Coordinate Systems, including experimental investigations and results on different optical systems. In particular the third Chapter is dedicated to methods, standards and guideline for performance verifications and traceability of non-contact CMS, while the fourth Chapter describes activities related to the development and testing of cooperative calibration artefacts.
The third part is finally dedicated to industrial applications. The newly developed cooperative artefacts, in particular, have been applied within the European Cooperative Research Project OP3MET. During the Project, an innovative optical measuring system for automated inspection of dimensional and geometrical tolerances, including free-form surfaces, has been developed. The contribution of the author has concerned metrological verification and traceability of the new developed system. Particular attention has been paid to the application of the guideline VDI/VDE 2617-6.2: 2005. On the basis of specific experimental results on a laser scanner, the main problems arising in the implementation of testing procedures were analyzed. The second industrial case reported in this work has been related to the integration of a chromatic sensor into a high precision circular grinding machine. The author of this Thesis participated to the integration-project working directly to the development of a software module for in-line measurement of roundness and automatic correction of systematic errors of the measurement system. After a first phase of modelling and simulation of the measuring process, the developed module has been validated by comparison with results obtained with dedicated roundness equipment and metrological software.
In the last Chapter of the present work, the main results from an industrial inter-laboratory comparison for Coordinate Measuring Machines equipped with optical sensors are presented. The comparison, named VideoAUDIT, has been organized and coordinated by the Laboratory of Industrial and Geometrical Metrology of the University of Padova, involving a total of 21 CMMs in Italy and other European countries. As one of the most important result, the comparison has proved that the quality of dimensional measurement results on real industrial workpieces is largely independent on the CMM length measurement performance, as well as the limited ability of most participants to properly evaluate task-specific measurement uncertainty.Allo stato dell’arte, l’uso di sistemi di misura a coordinate (CMS) per la verifica di tolleranze geometriche e dimensionali risulta essere sempre più diffuso in ambito manifatturiero. Tuttavia, l’esigenza relativa alla riduzione dei tempi di controllo, unita ad una maggiore complessità nel task di misura, sta mettendo in luce i limiti dei tradizionali sistemi di misura a contatto. In particolare la miniaturizzazione dei componenti e l’utilizzo di nuovi materiali facilmente danneggiabili rende l’impiego dei sistemi ottici sempre più indicato nell’ambiente produttivo industriale. Tuttavia, alcuni problemi permangono ancora a limitare la diffusione di strumenti di misura ottici per il controllo geometrico e dimensionale. Se da un lato, infatti, sono numerosi i vantaggi che essi presentano rispetto agli strumenti a contatto, dall’altro una maggiore sensibilità a fonti di errore addizionali e un panorama normativo carente rendono difficoltoso l’impiego di questi strumenti. In particolare, la mancanza di metodi standardizzati per la verifica delle prestazioni metrologiche e per la riferibilità delle misure impediscono il confronto con i risultati ottenuti mediante sistemi a contatto o tra sistemi ottici basati su principi di acquisizione diversi. Il presente lavoro di Tesi ha avuto come obiettivo principale quello di contribuire allo sviluppo di metodi e campioni per la verifica di prestazioni di sistemi ottici, mediante lo studio accurato dell’attuale impiego in ambito manufatturiero e attraverso l’applicazione dei criteri proposti in casi di interesse industriale. In particolare il presente elaborato risulta essere composto da tre parti. La prima parte contiene lo studio dello stato dell’arte relativo alla Metrologia a Coordinate non a contatto, con particolare riferimento ai requisiti in ambito industriale, alla descrizione e alla classificazione dei principali strumenti ottici utilizzabili. La seconda parte del lavoro di Tesi risulta essere invece interamente dedicata alla verifica di prestazioni dei sistemi non a contatto, comprendendo test e risultati ottenuti su diversi sistemi di misura. In dettaglio, dopo una descrizione di metodi, norme e linee guida relativi a criteri di accettazione e verifica di sistemi a coordinate ottici, particolare attenzione viene dedicata allo sviluppo di campioni di taratura. I nuovi campioni sviluppati sono stati utilizzati dall’autore all’interno del Progetto di Ricerca OP3MET, il primo di tre casi aventi ricaduta industriale riportati nella terza parte del lavoro di tesi. All’interno del Progetto OP3MET, avente per obiettivo principale lo sviluppo di un nuovo sistema di misura 3D mediante scansione laser, l’attività dell’autore ha riguardato prevalentemente lo studio della riferibilità delle misure ottenute, l’applicazione di metodi per la verifica di prestazioni, il calcolo dell’incertezza di misura e lo sviluppo di test specifici per le verifica del nuovo software metrologico sviluppato. Il secondo caso industriale affrontato durante il lavoro di Tesi ha riguardato l’integrazione di un sensore di misura cromatico in una macchina utensile per rettifica circolare. L’attività svolta dall’autore ha avuto come obiettivo lo sviluppo di un modulo software per la misura di rotondità in linea, in grado di effettuare la correzione automatica dei principali errori sistematici del sistema di misura stesso. Dopo una prima fase di modellazione e simulazione del processo di misura, il modulo software sviluppato è stato validato mediante il confronto con strumenti e software dedicati Nell’ultimo capitolo del lavoro di tesi vengono riportati i risultati principali del Progetto VideoAUDIT, un confronto inter-aziendale tra macchine di misura a coordinate con sensori ottici ideato e coordinato dal Laboratorio di Metrologia Geometrica ed Industriale dell’Università di Padova. Dal confronto, comprendente 21 CMM in Italia e altri paesi europei, è emerso in particolare come la qualità delle misure effettuate su comuni componenti industriali sia alquanto indipendente dalle prestazioni metrologiche del sistema, così come sussistano evidenti problemi da parte degli utilizzatori nel valutare propriamente l’incertezza di misura.
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Davis, Tyler A. "Flexible machine tool control for direct, in-process dimensional part inspection /". Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd478.pdf.
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Fleming, Patrick R. "Vibrational coordinate transformation and optimization". Thesis, 1989. http://hdl.handle.net/1911/16231.
Testo completoAbstract (sommario):
The nature of molecular vibrational coordinates is elucidated through the use of canonical coordinate transformations of the Hamiltonian. The importance of studying molecular vibrations with quantum mechanical calculational techniques is discussed and the methods for doing these calculations in rectilinear rotations of the bond coordinates are presented. Chief among these methods are prediagonalization and the transformation method, also known as the discrete variable representation. The results of coordinate rotation calculations on a three-coordinate stretching-only model of acetylene are presented and discussed. The results of calculations on two two-coordinate subsystems of acetylene are also presented. In all of these cases prediagonalization and rotated coordinates result in a substantial improvement in the quality of the zero order basis as measured by the projection of the eigenstate of interest onto the product function basis state with the same quantum numbers. Optimized coordinate rotation calculations for a two-coordinate stretching-only model of hydrogen cyanide are presented. The results are similar to those of the acetylene calculations. The physical interpretation of the hydrogen cyanide calculations is easier because contour plots of the entire system are possible. An unexpected and previously unexplained intensity pattern in the hydrogen cyanide vibrational overtone spectrum is analyzed and clarified. Finally, drawbacks to these calculational techniques are discussed and possible improvements and future uses are suggested.
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Li, Huai-Che, e 李懷哲. "Polar-Coordinate Fourier Volume Rendering". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/20744232374413003382.
Testo completoAbstract (sommario):
碩士國立中興大學
電機工程學系所
94
The requirement of high resolution volume visualization is rapidly increasing with the development of modern computer technology. How to handle large volumetric dataset effectively becomes a major problem in volume rendering techniques. Fourier volume rendering (FVR) shows great computational advantages then Ray-casting volume rendering algorithm that suitable for generating projection image of volume dataset interactively. In this work, we present a novel FVR algorithm based on polar coordinate for rendering volume dataset with both high speed and high image quality. Our method processes volumetric spectrum in polar coordinate instead the Cartesian coordinate in traditional FVR algorithm. By this way, the heavy computation can be leaved into pre-processing step and spectrum data can be stored into spectrum-liked data structure. In this paper, we implement both traditional FVR method and our Polar approach for comparison. In our experiment, polar approach can produce high-quality images with high rendering speed.