Rozprawy doktorskie na temat „Correlation”
Kliknij ten link, aby zobaczyć inne rodzaje publikacji na ten temat: Correlation.
Utwórz poprawne odniesienie w stylach APA, MLA, Chicago, Harvard i wielu innych
Sprawdź 50 najlepszych rozpraw doktorskich naukowych na temat „Correlation”.
Przycisk „Dodaj do bibliografii” jest dostępny obok każdej pracy w bibliografii. Użyj go – a my automatycznie utworzymy odniesienie bibliograficzne do wybranej pracy w stylu cytowania, którego potrzebujesz: APA, MLA, Harvard, Chicago, Vancouver itp.
Możesz również pobrać pełny tekst publikacji naukowej w formacie „.pdf” i przeczytać adnotację do pracy online, jeśli odpowiednie parametry są dostępne w metadanych.
Przeglądaj rozprawy doktorskie z różnych dziedzin i twórz odpowiednie bibliografie.
1
Courtney, Peter R. "Correlation techniques for application in photon correlation spectroscopy". Thesis, University of Manchester, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.237235.
Pełny tekst źródła
2
Zimek, Arthur. "Correlation Clustering". Diss., lmu, 2008. http://nbn-resolving.de/urn:nbn:de:bvb:19-87361.
Pełny tekst źródła
3
Hamdi, Walaa Ahmed. "Local Distance Correlation: An Extension of Local Gaussian Correlation". Bowling Green State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1589239468129597.
Pełny tekst źródła
4
Martinsson, Engshagen Jan. "Nothing is normal in nance! : On Tail Correlations and Robust Higher Order Moments in Normal Portfolio Frameworks". Thesis, KTH, Matematik (Inst.), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-102699.
Pełny tekst źródłaStreszczenie:
Abstract This thesis project is divided in two parts. The first part examines the possibility that correlation matrix estimates based on an outlier sample would contain information about extreme events. According to my findings, such methods do not perform better than simple shrinkage methods where robust shrinkage targets are used. The method tested is especially outperformed when it comes to the extreme events, where a shrinkage of the correlation matrix towards the identity matrix seems to give the best result. The second part is about valuation of skewness in marginal distributions and the penalizing of heavy tails. I argue that it is reasonable to use a degrees of freedom parameter instead of kurtosis and a certain regression parameter, that I develop, instead of skewness due to robustness issues. When minimizing the one period draw-down is our target, the "value" of skewness seems to have a linear relationship with expected returns. Re-valuing of expected returns, in terms of skewness, in the standard Markowitz framework will tend to lower expected shortfall (ES), increase skewness and lower the realized portfolio variance. Penalizing of heavy tails will most times in the same way lower ES, lower kurtosis and realized portfolio variance. The results indicate that the parameters representing higher order moments in some way characterize the assets and also reflect their future behavior. These properties can be used in a simple optimization framework and seem to have a positive impact even on portfolio level
5
Teeple, David Allan. "Biconditional prominence correlation /". Diss., Digital Dissertations Database. Restricted to UC campuses, 2009. http://uclibs.org/PID/11984.
Pełny tekst źródła
6
Fafchamps, Lionel. "Aperture correlation microscopy". Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/45648.
Pełny tekst źródłaStreszczenie:
Microscopy as applied to the biological sciences has benefited tremendously in the last 50 years from the invention of optically sectioning microscopes. Many techniques for microscopy developed recently offer super-resolved imaging, but often at the cost of light efficiency, signal, acquisition speed or significant amounts of money. This thesis investigates further development of aperture correlation microscopy: a cheap, light-efficient, wide-field, optically sectioning, video-rate imaging technique until now incapable of super-resolution. An aperture correlation microscope was constructed, using a geometry consisting of 2 separate cameras permitting a larger field size than previous spinning disk aperture correlation systems. This microscope, operating at 16Hz (limited by the cameras) was then tested by imaging different samples and found to match reasonably well to the theory, while producing very clear images of biological samples. In order to power this aperture correlation microscope, an image registration algorithm must first register the frames from both cameras. We present a high-speed image registration algorithm suitable for fixed deformations, where a calibration pattern can first be imaged, by leveraging the graphics processing unit. In testing, this registration algorithm is capable of framerates of over 200Hz on modest hardware. A reflection correlation microscope was also constructed and characterised, operating at an illumination wavelength of 405nm, representing an advance into the UV for this technique. Synchronisation of camera acquisition and disk rotation allow for fast acquisition from a single camera. Measurements of its axial resolution match closely to the theory for 4 different illumination pattern pitches. Z-Stacks of transistor and Photovoltaic cell samples were taken in order to demonstrate this system's viability for imaging semiconductor devices. Finally, a novel type of aperture correlation microscope capable of super-resolution is designed and characterised, leveraging coherent illumination. It is demonstrated how tailoring the spatial frequencies present in the aperture mask can result in enhancement of high frequency information up to twice the diffraction limit. Transfer functions are measured, and found to match reasonably well with theory. Lateral resolution improvement of 1.5 times over conventional microscopy is seen here, paving the way for a new, highly efficient super-resolving microscope.
7
Bhatta, Sanjeev. "Conditional Correlation Analysis". Wright State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=wright1495963166600514.
Pełny tekst źródła
8
Schmidt, Robert. "Hippocampal correlation coding". Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2010. http://dx.doi.org/10.18452/16134.
Pełny tekst źródłaStreszczenie:
Korrelationskodierung im Hippokampus bildet möglicherweise die neuronale Basis für episodisches Gedächtnis. In dieser Arbeit untersuchen wir zwei Phänomene der Korrelationskodierung: Phasenpräzession und Sequenzwiederholungen. Phasenpräzession bezeichnet die Abnahme der Phase des Aktionspotentials einer Ortszelle relativ zur Theta-Oszillation. Sequenzwiederholung beschreibt die Aktivität von Ortszellen in Ruhephasen; dabei werden vorangegangene Orts- Sequenzen in umgekehrter Reihenfolge wiederholt. Wir untersuchen Phasenpräzession in einzelnen Versuchsdurchläufen. In bisherigen Studien wurden Daten zur Phasenpräzession in vielen Versuchsdurchläufen zusammengelegt. Wir zeigen, dass dies zu einer verzerrten Schätzung von grundlegenden Eigenschaften der Phasenpräzession führen kann. Weiterhin demonstrieren wir eine starke Variabilität der Phasenpräzession zwischen verschiedenen Versuchsdurchläufen. Daher ist Phasenpräzession besser geeignet zeitlich strukturierte Sequenzen zu lernen, als man aufgrund der zusammengelegten Daten vermutet hatte. Desweiteren untersuchen wir die Beziehung von Phasenpräzession in unterschiedlichen Teilen des Hippokampus. Wir zeigen, dass die extrazellulären Theta- Oszillationen in CA3 und CA1 außer Phase sind. Dennoch geschieht Phasenpräzession in beiden Regionen fast gleichzeitig, und CA3 Zellen feuern oft kurz vor CA1 Zellen. Diese zeitliche Beziehung ist im Einklang mit einer Vererbung von Phasenpräzession von CA3 nach CA1. Wir entwickeln ein mechanistisches Modell für Sequenzwiederholungen in umgekehrter Reihenfolge basierend auf Kurzzeitfazilitierung. Mit Hilfe des Tempotrons beweisen wir, dass die entstehenden zeitlichen Muster geeignet sind, um von nachgeschalteten Strukturen ausgelesen zu werden. Das Modell sagt voraus, dass im Gyrus Dentatus synchrone Zellaktivität kurz vor einer Sequenzwiederholung in CA3 zu sehen ist, und es zeigt, dass Sequenzwiederholungen zum Lernen von zeitlichen Mustern genutzt werden können.Hippocampal correlation coding is a putative neural mechanism underlying episodic memory. Here, we look at two related phenomena: phase precession and reverse replay of sequences. Phase precession refers to the decrease of the firing phase of a place cell with respect to the local theta rhythm during the crossing of the place field. Reverse replay refers to reactivation of previously experienced place field sequences in reverse order during awake resting periods. First, we study properties of phase precession in single trials. Usually, phase precession is studied on the basis of data in which many place field traversals are pooled together. We find that single-trial and pooled-trial phase precession are different with respect to phase-position correlation, phase-time correlation, and phase range. We demonstrate that phase precession exhibits a large trial-to-trial variability and that pooling trials changes basic measures of phase precession. These findings indicate that single trials may be better suited for encoding temporally structured events than is suggested by the pooled data. Second, we examine the coordination of phase precession among subregions of the hippocampus. We find that the local theta rhythms in CA3 and CA1 are almost antiphasic. Still, phase precession in the two regions occurs with only a small phase shift, and CA3 cells tend to fire a few milliseconds before CA1 cells. These results suggest that phase precession in CA1 might be inherited from CA3. Finally, we present a model of reverse replay based on short-term facilitation. The model compresses temporal patterns from a behavioral time scale of seconds to shorter time scales relevant for synaptic plasticity. We demonstrate that the compressed patterns can be learned by the tempotron learning rule. The model provides testable predictions (synchronous activation of dentate gyrus during sharp wave-ripples) and functional interpretations of hippocampal activity (temporal pattern learning).
9
Hui, Joseph S. M. Massachusetts Institute of Technology. "Distributed correlation generators". Thesis, Massachusetts Institute of Technology, 2018. https://hdl.handle.net/1721.1/122871.
Pełny tekst źródłaStreszczenie:
Thesis: S.M., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2018Cataloged from PDF version of thesis.
Includes bibliographical references (pages 39-40).
We study the problem of distributed correlation generators wherein n parties wish to simulate unbounded samples from a joint distribution D = Di x D2 X ... x D[subscript n], once they are initialized using randomness sampled from a (possibly different) correlated distribution. We wish to ensure that these samples are computationally indistinguishable from i.i.d. samples from D. Furthermore, we wish to ensure security even against an adversary who corrupts a subset of the parties and obtains their internal (initialization) state. Our contributions are three-fold. First, we define the notion of distributed (noninteractive) correlation generators and show its connection to other cryptographic primitives. Secondly, assuming the existence of indistinguishability obfuscators, we show a construction of distributed correlation generators for a large and natural class of joint distributions that we call conditionally sampleable distributions. Finally, we show a construction for the subclass of additive-spooky distributions assuming private constrained pseudorandom functions (private CPRFs).
by Joseph Hui.
S.M.
S.M. Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science
10
Nicovich, Philip R. "Widefield fluorescence correlation spectroscopy". Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/33849.
Pełny tekst źródłaStreszczenie:
Fluorescence correlation spectroscopy has become a standard technique for modern biophysics and single molecule spectroscopy research. Here is presented a novel widefield extension of the established single-point technique. Flow in microfluidic devices was used as a model system for microscopic motion and through widefield fluorescence correlation spectroscopy flow profiles were mapped in three dimensions. The technique presented is shown to be more tolerant to low signal strength, allowing image data with signal-to-noise values as low as 1.4 to produce accurate flow maps as well as utilizing dye-labeled single antibodies as flow tracers. With proper instrumentation flows along the axial direction can also be measured. Widefield fluorescence correlation spectroscopy has also been utilized to produce super-resolution confocal microscopic images relying on the single-molecule microsecond blinking dynamics of fluorescent silver clusters. A method for fluorescence modulation signal extraction as well as synthesis of several novel noble metal fluorophores is also presented.
11
Yener, Tina. "Risk management beyond correlation". Diss., lmu, 2011. http://nbn-resolving.de/urn:nbn:de:bvb:19-142730.
Pełny tekst źródła
12
Yu, Jianhui. "On Intraclass Correlation Coefficients". Digital Archive @ GSU, 2009. http://digitalarchive.gsu.edu/math_theses/75.
Pełny tekst źródłaStreszczenie:
This paper uses Maximum likelihood estimation method to estimate the common correlation coefficients for multivariate datasets. We discuss a graphical tool, Q-Q plot, to test equality of the common intraclass correlation coefficients. Kolmogorov-Smirnov test and Cramér-von Mises test are used to check if the intraclass correlation coefficients are the same among populations. Bootstrap and empirical likelihood methods are applied to construct the confidence interval of the common intraclass correlation coefficients.
13
FIALLOS, HUETE ANTONIO JOSE. "Adative correlation time window". Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-121290.
Pełny tekst źródłaStreszczenie:
Event correlation plays a key role in network management. It is the ability in networkmanagement systems to co-relate events by reading into event attributes and extractingmeaningful information that has value to network operators. It is a conceptual interpretation ofmultiple events such that a new meaning is assigned to these events. This interpretation is usedto pinpoint the events that are behind a root cause incident. The root cause could be a faultynode or an underperforming link. Understanding correlation patterns can potentially helpidentify and localize the root cause of a problem in a network so that network operators takenecessary actions to issue restoration operations. An important technique used by event correlators is temporal correlation of events,whereby events closely related in time with each other are correlated. This technique uses acorrelation time window as an interval in time to capture and correlate events. Traditionally,event correlators have used a fixed-sized correlation time window to perform event correlationin which the size of the correlation time window is fixed. However, this does not scale properlyin modern networks where dynamic relationships are commonplace. To address this issue, thisthesis presents and discusses the idea of an adaptive correlation time window, whereby thewindow size is dynamically calculated based on observable network conditions and processingtimes. The aim of the investigation is to explore the performance of an adaptive window inseveral network scenarios and, more importantly, to compare both types of windows in termsof their performance. To do this, several experiments were designed and performed on avirtualized network test bed. The results of such experiments demonstrate that the adaptivecorrelation time window adequately adapts to varying network conditions. The investigationalso shows the conditions that need to be fulfilled in order to observe a better performance ofeither type of window.
14
Rodriguez-Perez, Andres F. "Maximum Margin Correlation Filters". Research Showcase @ CMU, 2012. http://repository.cmu.edu/dissertations/137.
Pełny tekst źródłaStreszczenie:
Support vector machines (SVMs) and correlation filters (CFs) are popular for automatic target recognition (ATR) and other computer vision tasks. SVMs are designed to maximize the separation between two classes in some feature space. SVMs are popular for classification (determining the class-label of a target) and generalize well for targets not in the training set, but SVMs are not specifically designed for localization (finding where a target is). When using SVMs, regions of interest (ROIs) are usually first extracted using some other detector before SVMs are applied. CFs accurately localize the target of interest in a large scene but their classification performance may not be as good (compared to SVMs) for targets not in the training set. In this thesis we introduced new linear CFs by combining the criteria used in state-of-the-art CFs to improve performance. Using our improved linear CF designs, we present a new type of classifier called the Maximum Margin Correlation Filters (MMCFs), which combine the generalization capabilities of SVMs and the shiftinvariance of correlation filters (CFs), i.e., MMCF is also invariant to shifts between the training images and the query image, thereby avoiding the need for image registration and detection before SVM-based classification. We extend our work to quadratic correlation filters (QCFs) and present the Quadratic MMCF (QMMCF) and show its relation to the second order polynomial Kernel SVM (referred to as Quadratic SVM (QSVM) in this thesis). We extend the capabilities of CFs and therefore of MMCFs and QMMCFs to include vector features (as opposed to scalar features, i.e., gray-scaled pixels) in order to use features such as the Histogram of Oriented Gradients (HOG).We test the efficacy of the our designs on real data and show improvement over linear and quadratic CFs and linear and quadratic SVMs.
15
Zayed, Hany. "Resistance in rank correlation". Thesis, University of Huddersfield, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270436.
Pełny tekst źródła
16
Picone, Domenico. "Copulae and correlation products". Thesis, City University London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.418994.
Pełny tekst źródła
17
Grebenkov, Denis S. "Multiple correlation function approach". Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-194264.
Pełny tekst źródłaStreszczenie:
The multiple correlation function approach is briefly presented and applied to investigate spin-echo signal attenuation due to restricted diffusion in simple geometries (slab, cylinder, and sphere) in the presence of surface relaxation. Exact and explicit
representations for the zeroth and second moments of the total phase accumulated by diffusing spins are derived by using the Laplace transform summation technique. Within the Gaussian phrase approximation, these two moments determine the reference and diffusion-weighted signals, respectively. In the slow-diffusion or short-time regime, the series expansion in half-integer powers of the diffusion coefficient is generalized to arbitrary temporal profile of a linear magnetic field gradient. In the motional-narrowing or long-time regime, it is shown how the presence of surface relaxation modifies the classical Robertson’s relation. Practical consequences of these findings are discussed.
18
Chen, Peng. "Modelling the Stochastic Correlation". Thesis, KTH, Matematisk statistik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-188501.
Pełny tekst źródłaStreszczenie:
In this thesis, we mainly study the correlation between stocks. The correlation between stocks has been receiving increasing attention. Usually the correlation is considered to be a constant, although it is observed to be varying over time. In this thesis, we study the properties of correlations between Wiener processes and introduce a stochastic correlation model. Following the calibration methods by Zetocha, we implement the calibration for a new set of market data.I det här examensarbetet fokuserar vi främst på att studera korrelation mellan aktier. Korrelationen mellan aktier har fått allt större uppmärksamhet. Vanligtvis antas korrelation vara konstant, trots att empiriska studier antyder att den är tidsvarierande. I det här examensarbetet studerar vi egenskaper hos korrelationen mellan Wienerprocesser och inför en stokastisk korrelationsmodell. Baserat på kalibreringsmetoder av Zetocha implementerar vi kalibrering för en ny uppsättning av marknadsdata.
19
Novaes, Marcos (Marcos Nogueira). "Multiresolution Signal Cross-correlation". Thesis, University of North Texas, 1994. https://digital.library.unt.edu/ark:/67531/metadc277645/.
Pełny tekst źródłaStreszczenie:
Signal Correlation is a digital signal processing technique which has a wide variety of applications, ranging from geophysical exploration to acoustic signal enhancements, or beamforming. This dissertation will consider this technique in an underwater acoustics perspective, but the algorithms illustrated here can be readily applied to other areas. Although beamforming techniques have been studied for the past fifty years, modern beamforming systems still have difficulty in operating in noisy environments, especially in shallow water.
20
Zu, Ying. "Cross-Correlation Cluster Cosmology". The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1376958777.
Pełny tekst źródła
21
Póvoa, Luís. "Correlation of network information". Master's thesis, Universidade de Aveiro, 2010. http://hdl.handle.net/10773/7145.
Pełny tekst źródłaStreszczenie:
Mestrado em Engenharia de Computadores e TelemáticaNos dias de hoje, e imposs vel para empresas ou para um utilizador comum de computador, trabalhar sem internet, pesquisar, comunicar, partilhar informa c~ao . . . Todos os dias, novas amea cas s~ao criadas e podem afectar milh~oes de computadores e centenas de empresas numa quest~ao de minutos ou horas. As solu c~oes existentes ainda dependem da interven c~ao Humana e an alise de tr afego, o que signi ca que existe sempre mais margem para erro e falhas. Tudo muda rapidamente e a informa c~ao tende a aumentar mais e mais, tanto em redes privadas como na Internet, seja essa informa c~ao sens vel ou n~ao. Ent~ao, toda esta informa c~ao deve ser automaticamente reunida e processada, deixando o m nimo poss vel de responsabilidade para o Administrador de rede. Esta disserta c~ao pretende lembrar que a seguran ca n~ao deve nunca ser vista como uma tarefa secund aria. E com este princ pio em mente, o principal objectivo e criar um sistema, f acil de usar, instalar e de administrar, para obter a informa c~ao dispon vel de servidores e equipamentos de toda a rede. A informa c~ao recolhida pode ser depois utilizada para detectar anomalias de rede e deve tamb em ter a capacidade de implementar as contra-medidas mais apropriadas .
Nowadays, it is impossible for companies or a common computer user, to work without Internet, searching, communicating, sharing information. . . Every day new threats are created and can a ect millions of computers and hundreds of companies in a matter of minutes or hours. Existing solutions still depend on Human intervention and network tra c analysis, which means they are open to breaches. Everything changes faster, runs faster, and information tends to increase more and more, both in private networks and on the Internet, whether it is sensitive or not. So, all this information should be automatically gathered and processed, letting as less as possible behind the responsibility of the Network Administrator. This dissertation intends to remember that security should never be seen as a secondary task. Having this principle in mind, the main purpose was to create a system, easy to use, install and administrate in order to gather information from the servers and equipments of the entire Network. Collected information can then be used to detect network anomalies and the system should also have the ability to deploy them most appropriate countermeasures.
22
Fernandez, Joseph A. "Accounting for Aliasing in Correlation Filters : Zero-Aliasing and Partial-Aliasing Correlation Filters". Research Showcase @ CMU, 2014. http://repository.cmu.edu/dissertations/335.
Pełny tekst źródłaStreszczenie:
Correlation filters (CFs) are well established and useful tools for a variety of tasks in signal processing and pattern recognition, including automatic target recognition and tracking, biometrics, landmark detection, and human action recognition. Traditionally, CFs have been designed and implemented efficiently in the frequency domain using the discrete Fourier transform (DFT). However, the element-wise multiplication of two DFTs in the frequency domain corresponds to a circular correlation, which results in aliasing (i.e., distortion) in the correlation output. Prior CF research has largely ignored these aliasing effects by making the assumption that linear correlation is approximated by circular correlation. In this work, we investigate in detail the topic of aliasing in CFs. First, we illustrate that the current formulation of CFs in the frequency domain is inherently flawed, as it unintentionally assumes circular correlation during the design phase. This means that existing CFs are not truly optimal. We introduce zero-aliasing correlation filters (ZACFs) which fix this formulation issue by ensuring that each CF formulation problem corresponds to a linear correlation rather than a circular correlation. By adopting the ZACF design modifications, we show that the recognition and localization performance of conventional CF designs can be significantly improved. We demonstrate these benefits using a variety of data sets and present solutions to the computational challenges associated with computing ZACFs. After a CF is designed, it is used for object recognition by correlating it with a test signal. We investigate the use of the well-known overlap-add (OLA) and overlap-save (OLS) algorithms to improve the computation and memory requirements of this correlation operation for high dimensional applications (e.g., video). Through this process, we highlight important tradeoffs between these two algorithms that have previously been undocumented. To improve the computation and memory requirements of OLA and OLS, we introduce a new block filtering scheme, denoted partial-aliasing OLA (PAOLA) that intentionally introduces aliasing into the output correlation. This aliasing causes conventional CFs to perform poorly. To remedy this, we introduce partial-aliasing correlation filters (PACFs), which are specifically designed to minimize this aliasing. We demonstrate through numerical results that PACFs outperform conventional CFs in the presence of aliasing.
23
Mata, Raman Deep. "Correlation based landmine detection technique /". free to MU campus, to others for purchase, 2004. http://wwwlib.umi.com/cr/mo/fullcit?p1426084.
Pełny tekst źródła
24
Würflinger, Lars Erik. "Nonlocality in multipartite correlation networks". Doctoral thesis, Universitat Politècnica de Catalunya, 2013. http://hdl.handle.net/10803/129918.
Pełny tekst źródłaStreszczenie:
Despite the success of quantum mechanics in predicting the outcomes of experiments in many branches of physics, the foundations of the theory have remained subject of research and dispute. At the basis of this struggle with the theory lie the phenomena of nonlocality and entanglement. Since it was first predicted by Bell in 1964, nonlocality was not only verified in numerous experiments, but also identified as a useful resource for quantum information processing. Thus, the study of nonlocality is important both from a fundamental point of view and with respect to new applications in quantum information
theory, such as secure cryptography and randomness generation. The identification of entanglement as a resource for quantum information led to a strong theoretical effort devoted to its characterisation and detection. Many of the resulting mathematical tools find application in several domains of physics. Although the only known way to create nonlocal correlations is to measure entangled quantum systems, it has been shown that entanglement and nonlocality constitute two inequivalent properties. Therefore, in the light of the success of entanglement theory, it is of interest to also devise a resource theory of nonlocality.
The task of this thesis is to develop such a theoretical framework for the characterisation of nonlocality as a resource. To gain a better understanding of nonlocal correlations it will be necessary to investigate correlation scenarios that go beyond the situation originally considered by Bell. In doing so, this thesis provides new description of nonlocality that also have implications for the characterisation of quantum correlations and the detection of new forms of nonlocality. The first question we address is how nonlocality can consistently be defined in a scenario of arbitrarily many parties that may collaborate among each other. To this end we recognise which are the allowed physical operations in this situation and then define nonlocality as the resource that cannot be created by these operations. Our approach shows that the conventional definition of multipartite nonlocality, adopted by the community so far, is inconsistent with this operational definition; we further propose and analyse new models that do not suffer from these inconsistencies.
Furthermore, we show that our findings have implications for the characterisation of quantum correlations. A recent approach to describe the set of quantum correlation consists in using principles inspired from information theory. By using a special instance of the models we defined earlier we show a fundamental limitation of this approach: no bipartite information principle is sufficient to single out the set of quantum correlations from the set of nonsignalling correlations. We then developed a description of nonlocality in an even more generalised scenario of several parties. Motivated by a result of
Popescu we study scenarios where the parties are allowed to perform not only a single but sequences of measurements on their systems. Characterising nonlocality also in this scenario in operational terms and defining local models compatible with this definition, we show that a new form of nonlocality can be detected Lastly, we examine the problem of detecting the presence of nonlocality in a multipartite scenario when one is given only partial access to the global system. We find that one can verify that the total system must display nonlocality, even though the accessible subsystems only exhibit local correlations.
25
Sweet, Dustin L. "Forecasting unemployment with spatial correlation". Diss., Columbia, Mo. : University of Missouri-Columbia, 2005. http://hdl.handle.net/10355/4250.
Pełny tekst źródłaStreszczenie:
Thesis (M.S.)--University of Missouri-Columbia, 2005.The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (July 11, 2006) Includes bibliographical references.
26
Teng, Chunhui. "Alarm correlation in ATM networks". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0005/MQ43348.pdf.
Pełny tekst źródła
27
Olson, Ryan Michael. "Electron correlation theory and practice /". [Ames, Iowa : Iowa State University], 2007.
Znajdź pełny tekst źródła
28
Dertinger, Thomas. "Two-Focus fluorescence correlation spectroscopy". Jülich : Forschungszentrum, Zentralbibliothek, 2007. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=016575922&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Pełny tekst źródła
29
McCarthy, Shane. "Electron Correlation Energies in Atoms". Thesis, Fredericton: University of New Brunswick, 2012. http://hdl.handle.net/1882/35886.
Pełny tekst źródła
30
Holdsworth, P. C. W. "Correlation effects in atomic diffusion". Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355755.
Pełny tekst źródła
31
Hörmann, Wolfgang, i Gerhard Derflinger. "Universal Generators for Correlation Induction". Department of Statistics and Mathematics, Abt. f. Angewandte Statistik u. Datenverarbeitung, WU Vienna University of Economics and Business, 1994. http://epub.wu.ac.at/524/1/document.pdf.
Pełny tekst źródłaStreszczenie:
Compared with algorithms specialized for a single distribution universal (also called automatic or black-box) algorithms for continuous distributions were relatively seldom discussed. But they have important advantages for the user: One algorithm coded and tested only once can do the same or even more than a whole library of standard routines. It is only necessary to have a program available that can evaluate the density of the distribution up to a multiplicative factor. In this paper we show that transformed density rejection is well suited to construct universal algorithms suitable for correlation induction which is important for variance reduction in simulation. (author's abstract)Series: Preprint Series / Department of Applied Statistics and Data Processing
32
Salar, Kemal. "Sample size for correlation estimates". Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/27248.
Pełny tekst źródła
33
Orvalho, André. "Botnet Detection by Correlation Analysis". Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-105096.
Pełny tekst źródłaStreszczenie:
When a bot master uses a control and commander (C&C) mechanism to assemble a large number of bots, infecting them by using well known vulnerabilities, it forms a botnet. Botnets can vary in C&C architecture (Centralized C&C or P2P are the most common), communication protocols used (IRC, HTTP or others like P2P) and observable botnet activities. They are nowadays one of the largest threats on cyber security and it is very important to specify the different characteristics of botnets in order to detect them, the same way a hunter needs to know its prey before preparing methods to catch it. There are 2 important places to look for botnet activity: The network and the infected host. This project intends to present a study that correlates the behavior on the network with the behavior on the host in order to help detection, studies like [SLWL07] (based on network behavior) and [SM07] (based on host behavior) are two good start points to help on the research. The choice of the architecture was done by looking at the botnet characteristics especially the capacity of changing and evolving which makes methods for detection by misuse obsolete. The system is designed to first look at 4 features of system calls on the host side: First which system call it is, second the name of the application using the system call, third the time between this system call and the last system call and for last the sequence of the past three system calls. A technique of unsupervised learning (the K-means algorithm) will be used to calculate the values for the threshold using an unclassified training set. when on the real world the collection is used to calculate the values to compare with the threshold. If it passes the threshold than the necessary information is passed to the network evaluation block. On the network side and before receiving any data from the host side, it will calculate the threshold for the flows given on the training set. When using the data from the host to narrow down the number of flows to look at, it very if their values pass the threshold. The feature used to calculate the threshold is the time between flows. If the network finds flows that pass the threshold for the network evaluation block than it will emit reports and alarms to the user. The small experiences done show some promising signs for use on the real world even though a lot more further testing is needed especially on the network bit. The prototype shows some limitations that can be overcome by further testing and using other techniques to evolve the prototype.
34
Phang, Albert Poh Yau. "An integrated ultrasonic correlation spectrometer". Thesis, University of Nottingham, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.430320.
Pełny tekst źródła
35
Strange, Robin. "Electron correlation in quantum chemistry". Thesis, University of Birmingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289793.
Pełny tekst źródła
36
Johnson, Peter Thomas. "Spectral correlation of semiconductor laser". Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385428.
Pełny tekst źródła
37
Durrant, Simon. "Negative correlation in neural systems". Thesis, University of Sussex, 2010. http://sro.sussex.ac.uk/id/eprint/2387/.
Pełny tekst źródłaStreszczenie:
In our attempt to understand neural systems, it is useful to identify statistical principles that may be beneficial in neural information processing, outline how these principles may work in theory, and demonstrate the benefits through computational modelling and simulation. Negative correlation is one such principle, and is the subject of this work. The main body of the work falls into three parts. The first part demonstrates the space filling and accelerated central limit convergence benefits of negative correlation, both generally and in the specific neural context of V1 receptive fields. I outline two new algorithms combining traditional ICA with a correlation objective function. Correlated component analysis seeks components with a given correlation matrix, while correlated basis analysis seeks basis functions with a given correlation matrix. The benefits of recovering components and basis functions with negative correlations are shown. The second part looks at the functional role of negative correlation for integrate- and-fire neurons in the context of suprathreshold stochastic resonance, for neurons receiving Poisson inputs modelled by a diffusion approximation. I show how the SSR effect can be seen in networks of spiking neurons, and further show how correlation can be used to control the noise level, and that optimal information transmission occurs for negatively correlated inputs when parameters take biophysically plausible values. The final part examines the question of how negative correlation may be implemented in the context of small networks of spiking neurons. Networks of integrate-and-fire neurons with and without lateral inhibitory connections are tested, and the networks with the inhibitory connections are found to perform better and show negatively correlated firing patterns. This result is extended to more biophysically detailed neuron and synapse models, highlighting the robust nature of the mechanism. Finally, the mechanism is explained as a threshold-unit approximation to non-threshold maximum likelihood signal/noise decomposition.
38
Nirschl, Michael. "Superconformal symmetry and correlation functions". Thesis, University of Cambridge, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.615123.
Pełny tekst źródła
39
Penman, David Binnie. "Random graphs with correlation structure". Thesis, University of Sheffield, 1998. http://etheses.whiterose.ac.uk/14768/.
Pełny tekst źródłaStreszczenie:
In this thesis we consider models of random graphs where, unlike in the classical models G (n, p) the probability of an edge arising can be correlated with that of other edges arising. Attention focuses on graphs whose vertices are each assigned a colour (type) at random and where edges between differently coloured vertices subsequently arise with different probabilities (so-called RRC graphs), especially the special case with two colours. Various properties of these graphs are considered, often by comparing and contrasting them with the classical model with the same probability of each particular edge existing. Topics examined include the probabilities of trees and cycles, how the joint probability of two subgraphs compares with the product of their probabilities, the number of edges in the graph (including large deviations results), connectedness, connectivity, the number and order of complete graphs and cliques, and tournaments with correlation structure.
40
van, den Worm Lerinza. "Clinicopathological correlation in erythema induratum". Master's thesis, Faculty of Health Sciences, 2020. http://hdl.handle.net/11427/33988.
Pełny tekst źródłaStreszczenie:
Background - Erythema induratum (EI) is a reactive disorder to mycobacterium tuberculosis infection, a diagnosis not to be missed. Erythema nodosum (EN) is the main clinical differential of EI, but a distinctly different pathological condition that can be difficult to distinguish from EI. Methods – In this retrospective review we assess clinical and histological features of 40 EI cases and 16 EN cases. Six experienced dermatologists blindly diagnosed these cases based on clinical images, thereafter the histology was revealed, and they adjusted their diagnoses accordingly. Fleiss Kappa statistics were applied to determine inter-rater variability. A multi-variate logistic regression model determined the clinical and histological features that contribute most to an accurate diagnosis. Results - After assessing the clinical picture 48.8% of the EI cases and 74% of the EN cases were correctly diagnosed. With added histology results 67.1% EI and 81.2% EN cases were correct. EI cases showed inter-rater variability of 0.478 (pvalue < 0.01) before and 0.469 (p-value < 0.01) after histology was revealed. These features combined in a logistic regression model had a higher diagnostic accuracy than the assessors with regard to EI cases. The model was accurate in 100% and 80% of EI and EN cases respectively. Conclusions - While the study was limited by its retrospective nature and small sample size, valuable features (ulceration, vasculitis and lobular or septal panniculitis) were identified. A biopsy of the lower leg markedly increased the diagnostic accuracy, but there was less concordance between assessors, more research is needed to confirm these results.
41
GARCIA, VALERIE. "Balanites chroniques : correlation anatomo-clinique". Toulouse 3, 1994. http://www.theses.fr/1994TOU31536.
Pełny tekst źródła
42
N, Badorina L., i Бадьоріна Любов Миколаївна. "Model coustuction of formal correlation". Thesis, Київ, Національний авіаційний університет, 2009. http://er.nau.edu.ua/handle/NAU/14928.
Pełny tekst źródłaStreszczenie:
Integration processes, introduction of telecommunication means, computerizing of human activity have represented a set of new problems and tasks in scientific area which is between computer technologies and linguistics. Thanks to the current stormy development of the automated systems studies, the problem of construction of formal models describing various aspects in the subject field has become extremely important. Among them the leading position is taken by models and modes oriented on the automated evaluation of results of educational process.
43
Ilyin, O. I. "Correlation method of height measurement". Thesis, National Aviation University, 2021. https://er.nau.edu.ua/handle/NAU/50477.
Pełny tekst źródłaStreszczenie:
1. Sorochan A. G. Correlation radio rangefinder. Technology and design in electronic equipment. 2005. No. 1 P. 18-21.
2. Sorochan A. G., Dobryak D. A., Zabolotny E. V. Correlation radio rangefinder. Bulletin of the National Technical University of Ukraine «KPI». 2012. Vol. 49 P. 94-102.In conditions of increasing intensity of air traffic, the performance of safe and regular flights of aircraft requires the use of high-precision means of measuring low altitudes. The most common are three methods of measuring height: amplitude, frequency and phase. In recent years, the J-correlation method has also been developed.
В умовах зростаючої інтенсивності повітряного руху виконання безпечних та регулярних польотів повітряних суден вимагає використання високоточних засобів вимірювання малих висот. Найпоширенішими є три методи вимірювання висоти: амплітуда, частота та фаза. В останні роки також був розроблений метод J-кореляції.
44
Horwitz, Adrian Miles. "The development of correlation log". Master's thesis, University of Cape Town, 1985. http://hdl.handle.net/11427/26076.
Pełny tekst źródłaStreszczenie:
A measure of ship speed is needed for dead reckoning navigation, docking, and as an input to satellite navigation systems. Ship speed is also used as an input to fire control systems on Naval vessels. The need for an accurate speed measuring device, that measures ship speed relative to the sea bed is thus apparent. All non acoustic logs measure ship speed relative to the water, and absolute ship speed can only be estimated if a knowledge of water currents is available. An acoustic log that provides an absolute measure of ship speed at limited operating depths is the Doppler log. For deep water the Doppler log measures speed relative to the water and it is thus affected by currents. A new development in acoustic logs is the correlation log. The correlation log can measure absolute speed at much greater depths than can the Doppler log. This is because it utilises a wide beam pointing vertically at the sea bed. The.wide beam permits a low operating frequency to be used which implies low attenuation. The high backscattering strength at normal angles of incidence combined with the low attenuation, means that relative to the Doppler log, the correlation log can measure absolute speed at much greater depths. The correlation log consists of a transmitter, which utilises tone burst transmission, and two or more receivers in line with the direction of motion. The signals received by two transducers will be similar except for a time shift 'T', which is given by the equation T = d/2V, where V is the speed and d the transducer separation. A device based on these principles has been built and tested. Results have shown that the system concepts are viable and will lead to an absolute speed measuring device that can operate at great depth.
45
Teng, Chunhui Carleton University Dissertation Engineering Systems and Computer. "Alarm correlation in ATM networks". Ottawa, 1999.
Znajdź pełny tekst źródła
46
Şentürk, Damla. "Covariate adjusted regression and correlation /". For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2004. http://uclibs.org/PID/11984.
Pełny tekst źródła
47
Mosayebi, Mahshad. "Digital Laser Speckle Image Correlation". OpenSIUC, 2017. https://opensiuc.lib.siu.edu/theses/2131.
Pełny tekst źródłaStreszczenie:
This thesis examines the feasibility of combining Digital Image Correlation (DIC) with laser speckle based methods to form a new hybrid deformation measurement method called Digital Laser Speckle Image Correlation (DilSIC). Consequently, this method does not require any sample preparation and allows for the measurement of displacement of micro structures in addition to large displacements. In this technique, a coherent 30mW-632nm laser beam is expanded with 40X lens and then illuminated on the target surface to produce a fine, homogenous laser speckle pattern. Images were captured before and after deformation due to external load and the whole field displacement and strain were determined by the DIC method. This technique could measure displacement less than 30-μm with high accuracy when a 120mm × 80mm area of the surface was inspected. Up to 10% strain was measured by this technique with high accuracy during the whole range. Eventually the sub-surface crack was located successfully, which is a revolutionary achievement in NDT optical methods. This method was tested in different material, with different roughness. Aluminum sheet and rubber material were used mostly. This method could broaden the capability of displacement measurement and subsurface crack detection in wide range of materials.
48
Jain, Monika. "Regularized ensemble correlation filter tracking". Thesis, Queensland University of Technology, 2022. https://eprints.qut.edu.au/229266/1/Monika_Jain_Thesis.pdf.
Pełny tekst źródłaStreszczenie:
Visual Object Tracking is the task of tracking an object within a video. Broadly, most tracking algorithms can be classified into neural network based, correlation filter based, and hybrid. This thesis investigates various methods to improve tracking using correlation filters. The thesis contributes four novel trackers. The first tracker uses an appearance model pool to avoid faulty filter updates. Next, the appearance feature channel weights are learned using the graph-based similarity followed by modelling sparse spatio-temporal variations. At last, non-linearity of the appearance features is captured. The thesis also presents extensive evaluation of the proposed trackers on standard datasets.
49
Gilkey, Justin Michael. "The Effects of Sample Size on Measures of Subjective Correlation". Bowling Green State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1211901739.
Pełny tekst źródła
50
Teng, Long [Verfasser]. "Modelling of Credit Risk and Correlation Risk: Time-Dependent and Stochastic Correlation Models / Long Teng". Wuppertal : Universitätsbibliothek Wuppertal, 2015. http://d-nb.info/1081328908/34.
Pełny tekst źródła