Дисертації з теми "COSINUS"
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Baskurt, Atilla. "Compression d'images numériques par la transformation cosinus discrète." Lyon, INSA, 1989. http://www.theses.fr/1989ISAL0036.
Повний текст джерелаPerrot, Romuald. "Lobes de cosinus et visibilité pour la simulation d'éclairage." Thesis, Poitiers, 2012. http://www.theses.fr/2012POIT2304/document.
Повний текст джерелаSimulating light transfer within a virtual environment requires to solve a first order, infinite recursive integral, that unfortunately doesn't have any solution in general cases. Though theoretically exact solutions exist, their computing time is not adapted to real-time rendering in a near future. Many methods have been proposed for accelerating these computations, but they rely on approximations that often produce visible artifacts on the resulting images. Our goal is to propose some new solutions that can reduce biases with two complementary approaches : (i) a new homogeneous representation of each term of the equation can be used to resolve it using only simple operators ; (ii) considering precise visibility information in order to reduce bias of methods that rely on density estimation. On the long range, we aim at reducing visibility requests costs of each contribution. For that purpose, we particularly plan to introduce hierarchical visibility computations so as to amortize queries cost
Loeng, Ratha. "Les fonctions sinus et cosinus dans le secondaire en France et au Cambodge." Thesis, Université de Paris (2019-....), 2019. https://wo.app.u-paris.fr/cgi-bin/WebObjects/TheseWeb.woa/wa/show?t=3972&f=25464.
Повний текст джерелаThe themes “Trigonometry” and “Trigonometric Functions” are interesting but not very well covered in mathematics didactic, especially in the French context. However, they have long been present in French and Cambodian curricula. We are interested in students’ learning of these mathematical themes in secondary education, as well as the difficulties of understanding related to them. The study objects of secondary school, namely “cosine and sine of a geometric angle”, “cosine and sine of a real number”, “cosine and sine of an oriented angle” and “usual cosine and sine functions of a real variable”, constitute both mathematical and didactical difficulties: there are changes in settings, changes in mathematical objects (quantities “angle” and “length” – and their measurements – real numbers) with the same signs “ ” and “ ” used to designate different study objects. We focus on transitions between different settings, on students’ difficulties in learning, and in particular on the switch between the trigonometry of the trigonometric circle and the cosine and sine functions of a real variable, in French Terminale Scientifique (grade 12) (corresponding to the Première (grade 11) “Spécialité Mathématiques” curriculum in force for the new school year in September 2019) and in grade 11 in Cambodia (corresponding to the Première in France). For our study, we mainly rely on the praxeological organization of the Anthropological Theory of the Didactic. We determine three local mathematical organizations (LMO) corresponding to the trigonometry of the triangle, the trigonometry of the circle and the trigonometric functions. These LMOs arise from the study of French and Cambodian curricula pertaining to trigonometry, sine and cosine functions in secondary school, along with analyzes of a selection of textbooks. We present a mathematical theory to justify, construct and rigorously coordinate the three LMOs. Then, using the task analysis tools of the didactic/ergonomic Double Approach, we elaborate a questionnaire on the three determined LMOs. This is intended for grade 12 students, in order to evaluate the effects of the teaching trigonometry, sine and cosine functions in secondary school. The curricula study, the mathematical study and the questionnaire, in the French and Cambodian contexts, lead us to conceive, using the milieus structuration analysis tools from the Theory of Didactic Situations, a didactical situation focusing on the notion of periodicity aiming to discover the notions of sine and cosine functions via a graphical register, both in grade 12 in France and in grade 11 in Cambodia. The results on the whole research show students’ difficulties in understanding these two themes via the three LMOs and reveal both a didactical and an epistemological obstacle in the teaching and learning of the cosine and sine objects as well as the mathematical objects that accompany them. Carrying out targeted research by focusing on the mentioned abode obstacle, on the students’ side and on the teachers’ side, will lead to a didactical organization allowing to avoid the teaching and learning didactical obstacle of the two themes in secondary school
Auclair, Beaudry Jean-Sébastien. "Modelage de contexte simplifié pour la compression basée sur la transformée en cosinus discrète." Mémoire, Université de Sherbrooke, 2009. http://savoirs.usherbrooke.ca/handle/11143/1511.
Повний текст джерелаEude, Thierry. "Compression d'images médicales pour la transmission et l'archivage, par la transformée en cosinus discrète." Rouen, 1993. http://www.theses.fr/1993ROUES056.
Повний текст джерелаDugas, Alexandre. "Architecture de transformée de cosinus discrète sur deux dimensions sans multiplication et mémoire de transposition." Mémoire, Université de Sherbrooke, 2012. http://hdl.handle.net/11143/6174.
Повний текст джерелаHmida, Hedi. "Etude et comparaison d'algorythmes de transformée en cosinus discrète en vue de leur intégration VLSI." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37614318f.
Повний текст джерелаHmida, Hedi. "Étude et comparaison d'algorithmes de transformée en cosinus discrète en vue de leur intégration en VLSI." Paris 11, 1988. http://www.theses.fr/1988PA112133.
Повний текст джерелаQamar, Ali Mustafa. "Mesures de similarité et cosinus généralisé : une approche d'apprentissage supervisé fondée sur les k plus proches voisins." Phd thesis, Université de Grenoble, 2010. http://tel.archives-ouvertes.fr/tel-00591988.
Повний текст джерелаMaschio, Nicole. "Contribution à la compression d'images numériques par codage prédictif et transformée en cosinus discrète avec utilisation de codes arithmétiques." Nice, 1989. http://www.theses.fr/1989NICE4281.
Повний текст джерелаUrbano, Rodriguez Luis Alberto. "Contribution à la compression d'images par transformée en cosinus discrète en imagerie médicale, et évaluation sur une base d'images multi-modalités." Tours, 1991. http://www.theses.fr/1991TOUR3307.
Повний текст джерелаMiliani, El Hadj. "Commande d'un convertisseur matriciel : application à un générateur actif." Besançon, 2005. http://www.theses.fr/2005BESA2086.
Повний текст джерелаThe author proposes a contribution to the control of a naturally commutated matrix converter used in a variable speed constant frequency generating system. The association of the matrix converter and the synchronous generator is called active generator. This work describes a low cost and robust solution for the frequency conversion by using natural commutations. In the first chapter, the author presents several examples of variable speed constant frequency generating systems which transform the variable speed mechanical energy to a constant frequency electrical power. The matrix converter topology and its operation principle are also described. In order to present the active generator, a detailed study of the association “matrix converter - six-phase synchronous generator” is detailed in the second chapter; the system operation under several constraints is given too. In the third chapter, the author presents an innovative control strategy which permits the simultaneous control of the frequency, the phase and the amplitude of the output wave; this strategy is based on cosine modulation waves. Contrary to the control strategy presented in the first chapter, this control philosophy permits to obtain a regulated output wave. The output voltage waveform is done in such a way that the actual output waveform always has the nearest possible instantaneous value to a sinusoidal reference waveform of desired output frequency, desired phase and amplitude. Commutation instants are determined by the intersection of the reference voltage and the cosine modulation waves. The last chapter deals with the implementation of the control strategies on a digital signal processor DSP. Experimental results are presented and compared to those obtained by simulation
Coudoux, François-Xavier. "Evaluation de la visibilité des effets de blocs dans les images codées par transformée : application à l'amélioration d'images." Valenciennes, 1994. https://ged.uphf.fr/nuxeo/site/esupversions/a0a7cc38-609d-4d86-9c3a-a018590bc012.
Повний текст джерелаNortershauser, David. "Résolution de problèmes inverses tridimensionnels instationnaires de conduction de la chaleur." Toulouse, ENSAE, 2000. http://www.theses.fr/2000ESAE0017.
Повний текст джерелаZEMA, VANESSA. "Unveiling the Nature of Dark Matter with Direct Detection Experiments." Doctoral thesis, Gran Sasso Science Institute, 2020. http://hdl.handle.net/20.500.12571/9943.
Повний текст джерелаZhu, Zuowei. "Modèles géométriques avec defauts pour la fabrication additive." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLN021/document.
Повний текст джерелаThe intricate error sources within different stages of the Additive Manufacturing (AM) process have brought about major issues regarding the dimensional and geometrical accuracy of the manufactured product. Therefore, effective modeling of the geometric deviations is critical for AM. The Skin Model Shapes (SMS) paradigm offers a comprehensive framework aiming at addressing the deviation modeling problem at different stages of product lifecycle, and is thus a promising solution for deviation modeling in AM. In this thesis, considering the layer-wise characteristic of AM, a new SMS framework is proposed which characterizes the deviations in AM with in-plane and out-of-plane perspectives. The modeling of in-plane deviation aims at capturing the variability of the 2D shape of each layer. A shape transformation perspective is proposed which maps the variational effects of deviation sources into affine transformations of the nominal shape. With this assumption, a parametric deviation model is established based on the Polar Coordinate System which manages to capture deviation patterns regardless of the shape complexity. This model is further enhanced with a statistical learning capability to simultaneously learn from deviation data of multiple shapes and improve the performance on all shapes.Out-of-plane deviation is defined as the deformation of layer in the build direction. A layer-level investigation of out-of-plane deviation is conducted with a data-driven method. Based on the deviation data collected from a number of Finite Element simulations, two modal analysis methods, Discrete Cosine Transform (DCT) and Statistical Shape Analysis (SSA), are adopted to identify the most significant deviation modes in the layer-wise data. The effect of part and process parameters on the identified modes is further characterized with a Gaussian Process (GP) model. The discussed methods are finally used to obtain high-fidelity SMSs of AM products by deforming the nominal layer contours with predicted deviations and rebuilding the complete non-ideal surface model from the deformed contours. A toolbox is developed in the MATLAB environment to demonstrate the effectiveness of the proposed methods
Makki, Sara. "An Efficient Classification Model for Analyzing Skewed Data to Detect Frauds in the Financial Sector." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1339/document.
Повний текст джерелаThere are different types of risks in financial domain such as, terrorist financing, money laundering, credit card fraudulence and insurance fraudulence that may result in catastrophic consequences for entities such as banks or insurance companies. These financial risks are usually detected using classification algorithms. In classification problems, the skewed distribution of classes also known as class imbalance, is a very common challenge in financial fraud detection, where special data mining approaches are used along with the traditional classification algorithms to tackle this issue. Imbalance class problem occurs when one of the classes have more instances than another class. This problem is more vulnerable when we consider big data context. The datasets that are used to build and train the models contain an extremely small portion of minority group also known as positives in comparison to the majority class known as negatives. In most of the cases, it’s more delicate and crucial to correctly classify the minority group rather than the other group, like fraud detection, disease diagnosis, etc. In these examples, the fraud and the disease are the minority groups and it’s more delicate to detect a fraud record because of its dangerous consequences, than a normal one. These class data proportions make it very difficult to the machine learning classifier to learn the characteristics and patterns of the minority group. These classifiers will be biased towards the majority group because of their many examples in the dataset and will learn to classify them much faster than the other group. After conducting a thorough study to investigate the challenges faced in the class imbalance cases, we found that we still can’t reach an acceptable sensitivity (i.e. good classification of minority group) without a significant decrease of accuracy. This leads to another challenge which is the choice of performance measures used to evaluate models. In these cases, this choice is not straightforward, the accuracy or sensitivity alone are misleading. We use other measures like precision-recall curve or F1 - score to evaluate this trade-off between accuracy and sensitivity. Our objective is to build an imbalanced classification model that considers the extreme class imbalance and the false alarms, in a big data framework. We developed two approaches: A Cost-Sensitive Cosine Similarity K-Nearest Neighbor (CoSKNN) as a single classifier, and a K-modes Imbalance Classification Hybrid Approach (K-MICHA) as an ensemble learning methodology. In CoSKNN, our aim was to tackle the imbalance problem by using cosine similarity as a distance metric and by introducing a cost sensitive score for the classification using the KNN algorithm. We conducted a comparative validation experiment where we prove the effectiveness of CoSKNN in terms of accuracy and fraud detection. On the other hand, the aim of K-MICHA is to cluster similar data points in terms of the classifiers outputs. Then, calculating the fraud probabilities in the obtained clusters in order to use them for detecting frauds of new transactions. This approach can be used to the detection of any type of financial fraud, where labelled data are available. At the end, we applied K-MICHA to a credit card, mobile payment and auto insurance fraud data sets. In all three case studies, we compare K-MICHA with stacking using voting, weighted voting, logistic regression and CART. We also compared with Adaboost and random forest. We prove the efficiency of K-MICHA based on these experiments
Virette, David. "Étude de transformées temps-fréquence pour le codage audio faible retard en haute qualité." Rennes 1, 2012. http://www.theses.fr/2012REN1E014.
Повний текст джерелаMammeri, Abdelhamid. "Compression et transmission d'images avec énergie minimale application aux capteurs sans fil." Thèse, Université de Sherbrooke, 2010. http://hdl.handle.net/11143/5800.
Повний текст джерелаAtrevi, Dieudonne Fabrice. "Détection et analyse des évènements rares par vision, dans un contexte urbain ou péri-urbain." Thesis, Orléans, 2019. http://www.theses.fr/2019ORLE2008.
Повний текст джерелаThe main objective of this thesis is the development of complete methods for rare events detection. The works can be summarized in two parts. The first part is devoted to the study of shapes descriptors of the state of the art. On the one hand, the robustness of some descriptors to varying light conditions was studied.On the other hand, the ability of geometric moments to describe the human shape was also studied through a3D human pose estimation application based on 2D images. From this study, we have shown that through a shape retrieval application, geometric moments can be used to estimate a human pose through an exhaustive search in a pose database. This kind of application can be used in human actions recognition system which may be a final step of an event analysis system. In the second part of this report, three main contributions to rare event detection are presented. The first contribution concerns the development of a global scene analysis method for crowd event detection. In this method, global scene modeling is done based on spatiotemporal interest points filtered from the saliency map of the scene. The characteristics used are the histogram of the optical flow orientations and a set of shapes descriptors studied in the first part. The Latent Dirichlet Allocation algorithm is used to create event models by using a visual document representation of image sequences(video clip). The second contribution is the development of a method for salient motions detection in video.This method is totally unsupervised and relies on the properties of the discrete cosine transform to explore the optical flow information of the scene. Local modeling for events detection and localization is at the core of the latest contribution of this thesis. The method is based on the saliency score of movements and one class SVM algorithm to create the events model. The methods have been tested on different public database and the results obtained are promising
Makkaoui, Leila. "Compression d'images dans les réseaux de capteurs sans fil." Phd thesis, Université de Lorraine, 2012. http://tel.archives-ouvertes.fr/tel-00795503.
Повний текст джерелаGoujot, Daniel. "Méthodes d'ondelettes pour l'analyse numérique d'intégrales oscillantes." Phd thesis, Université d'Evry-Val d'Essonne, 2004. http://tel.archives-ouvertes.fr/tel-00008353.
Повний текст джерелаNord, Magnus. "Cosine Modulated Filter Banks." Thesis, Linköping University, Department of Electrical Engineering, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1641.
Повний текст джерелаThe initial goal of this report was to implement and compare cosine modulated filter banks. Because of time limitations, focus shifted towards the implementation. Filter banks and multirate systems are important in a vast range of signal processing systems. When implementing a design, there are several considerations to be taken into account. Some examples are word length, number systems and type of components. The filter banks were implemented using a custom made software, especially designed to generate configurable gate level code. The generated code was then synthesized and the results were compared. Some of the results were a bit curious. For example, considerable effort was put into implementing graph multipliers, as these were expected to be smaller and faster than their CSDC (Canonic Signed Digit Code) counterparts. However, with one exception, they turned out to generate larger designs. Another conclusion drawn is that the choice of FPGA is important. There are several things left to investigate, though. For example, a more thorough comparison between CSDC and graph multipliers should be carried out, and other DCT (Discrete Cosine Transform) implementations should be investigated.
Castelan, Ivair Carlos. "Zeno Cosini, uma identidade possível?" Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/8/8148/tde-18122008-113616/.
Повний текст джерелаPublished in 1923, the novel La coscienza di Zeno (Confessions of Zeno/Zeno\'s conscience) is important for building a narrative which brings in its core the modernity which disrupts and transgresses literary model´s rules. The man described in it will be branded by frustrations, surrounded by nothingness, tormented by life´s anguish. In that context the narrator Zeno Cosini is introduced, whose character is dubious since the preface by his supposedly text editor and psychoanalyst. Puzzling and ambiguous, mister Cosini calls upon the use of many masks to cover his identity throughout his memories. By trying to hide and cover himself all the time, Zeno leaves to his reader an intriguing question about his identity, as well as the challenge of trying to answer Who is Zeno, anyway?. Therefore, this paper aims at investigating Zeno Cosini\'s possible identities. Following the deepest ways of his speech, the following paper seeks unveiling, uncovering Cosini that behind his masks, his ironic and ambiguous discourse hides such a fragmented and multiple identity as mankind of his age. It is not intended to label this writer even because it would be impossible. Our main goal is to trace his steps, hear his dissonant voices in order to reach a conclusion over his personality traits and identity structured through the narrative.
Martins, Joao Roberto Vasconcellos. "Speech compression using cosine packet decomposition." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA308262.
Повний текст джерелаThesis advisor(s): M. Fargues, Ralph Hippenstiel. "March 1996." Includes bibliographical references. Also available online.
Hu, Ta-Hsiang. "Discrete cosine transform implementation in VHDL." Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA245791.
Повний текст джерелаThesis Advisor(s): Lee, Chin-Hwa ; Yang, Chyan. "December 1990." Description based on title screen as viewed on March 29, 2010. DTIC Identifier(s): Fast Fourier Transform, High Level Languages, CHIPS (Electronics), Computerized Simulation, Signal Processing, Theses, Algorithms, Floating Point Operation, VHDL (Vhsic Hardware Description Language). Author(s) subject terms: FFT System, DCT System Implementation. Includes bibliographical references (p. 152). Also available in print.
Mohammadzadeh, Hadi. "Improving Retrieval Accuracy in Main Content Extraction from HTML Web Documents." Doctoral thesis, Universitätsbibliothek Leipzig, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-130500.
Повний текст джерелаDas rasante Wachstum von textbasierten Informationen im World Wide Web und die Vielfalt der Anwendungen, die diese Daten nutzen, macht es notwendig, effiziente und effektive Methoden zu entwickeln, die den Hauptinhalt identifizieren und von den zusätzlichen Inhaltsobjekten wie z.B. Navigations-Menüs, Anzeigen, Design-Elementen oder Haftungsausschlüssen trennen. Zunächst untersuchen, entwickeln und evaluieren wir in dieser Arbeit R2L, DANA, DANAg und AdDANAg, eine Familie von neuartigen Algorithmen zum Extrahieren des Inhalts von Web-Dokumenten. Das grundlegende Konzept hinter R2L, das auch zur Entwicklung der drei weiteren Algorithmen führte, nutzt die Besonderheiten der Rechts-nach-links-Sprachen aus, um den Hauptinhalt von Webseiten zu extrahieren. Da der lateinische Zeichensatz und die Rechts-nach-links-Zeichensätze durch verschiedene Abschnitte des Unicode-Zeichensatzes kodiert werden, lassen sich die Rechts-nach-links-Zeichen leicht von den lateinischen Zeichen in einer HTML-Datei unterscheiden. Das erlaubt dem R2L-Ansatz, Bereiche mit einer hohen Dichte von Rechts-nach-links-Zeichen und wenigen lateinischen Zeichen aus einer HTML-Datei zu erkennen. Aus diesen Bereichen kann dann R2L die Rechts-nach-links-Zeichen extrahieren. Die erste Erweiterung, DANA, verbessert die Wirksamkeit des Baseline-Algorithmus durch die Verwendung eines HTML-Parsers in der Nachbearbeitungsphase des R2L-Algorithmus, um den Inhalt aus Bereichen mit einer hohen Dichte von Rechts-nach-links-Zeichen zu extrahieren. DANAg erweitert den Ansatz des R2L-Algorithmus, so dass eine Sprachunabhängigkeit erreicht wird. Die dritte Erweiterung, AdDANAg, integriert eine neue Vorverarbeitungsschritte, um u.a. die Weblinks zu normalisieren. Die vorgestellten Ansätze werden in Bezug auf Effizienz und Effektivität analysiert. Im Vergleich mit mehreren etablierten Hauptinhalt-Extraktions-Algorithmen zeigen wir, dass sie in diesen Punkten überlegen sind. Darüber hinaus findet die Extraktion der Überschriften aus Web-Artikeln vielfältige Anwendungen. Hierzu entwickeln wir mit TitleFinder einen sich nur auf den Textinhalt beziehenden und sprachabhängigen Ansatz. Das vorgestellte Verfahren ist in Bezug auf Effektivität und Effizienz besser als bekannte Ansätze, die auf strukturellen und visuellen Eigenschaften der HTML-Datei beruhen
Jin, Chengzhou. "Discrete Cosine Transform for Pre-coded EGPRS." Thesis, KTH, Signalbehandling, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-98761.
Повний текст джерелаBoudreau, Paul Jacques. "VLSI implementation of the integer cosine transform." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0005/MQ44898.pdf.
Повний текст джерелаChau, Ki-wai, and 周麒偉. "Fourier-cosine method for insurance risk theory." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/208586.
Повний текст джерелаpublished_or_final_version
Mathematics
Master
Master of Philosophy
Aimer, Younes. "Étude des performances d'un système de communication sans fil à haut débit." Thesis, Poitiers, 2019. http://www.theses.fr/2019POIT2269.
Повний текст джерелаThe request of the users in terms of rate, coverage and quality of service is growing exponentially, with increasing demand for electrical energy, to ensure networks link. In this context, new waveforms based on the OFDM modulation become widely popular and used intensively in recent radio communications architectures. However, these signals are sensitive to the power amplifier nonlinearities because of their high envelope fluctuations characterized by a high PAPR, which degrades the energy consumption and the transmitter efficiency.In this thesis, we first began by a state art of the PAPR reduction techniques. This presentation allowed us to propose a new method based on interleaving and coding techniques. The first contribution consists on the use of the interleaving technique using null-subcarriers for the transmission of the side information, while respecting the frequency specifications of the used standard. The second one is based on the conjunction of the Shaping technique and the Discrete Cosine Transform (DCT), with the aim of improving the performance of the system. Simulation results show that the use of these two techniques allows a significant gain in terms of PAPR reduction, which results in the improvement of the system efficiency. Finally, we presented an experimental study of the proposed techniques using an RF test bench with a commercial LDMOS 20 W PA, class AB operating at 3.7 GHz. The results obtained for the IEEE 802.11 standards show that the proposed approaches allow the transmission robustness and quality, while optimizing the power consumption
Abedi, Safdar Ali Syed. "Exploring Discrete Cosine Transform for Multi-resolution Analysis." Digital Archive @ GSU, 2005. http://digitalarchive.gsu.edu/cs_theses/12.
Повний текст джерелаBrown, Susan A. Presmeg Norma C. "The trigonometric connection students' understanding of sine and cosine /." Normal, Ill. : Illinois State University, 2005. http://proquest.umi.com/pqdweb?index=0&did=1251811011&SrchMode=1&sid=2&Fmt=2&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1176384631&clientId=43838.
Повний текст джерелаTitle from title page screen, viewed April 12, 2007. Dissertation Committee: Norma C. Presmeg (chair), John A. Dossey, Michael J. Plantholt. Includes bibliographical references (leaves 253-261) and abstract. Also available in print.
Bishop, Carlton Delos. "Finite impulse response filter design using cosine series functions." Doctoral diss., University of Central Florida, 1988. http://digital.library.ucf.edu/cdm/ref/collection/RTD/id/43377.
Повний текст джерелаWindow functions have been extensively used for the design of SAW filters. The classical truncated cosine series functions, such as the Hamming and Blackmann functions, are only a few of an infinite set of such functions. The derivation of this set of functions from orthonormal basis sets and the criteria for obtaining the constant coefficients of the functions are presented. These functions are very useful because of the closed-form expressions and their easily recognizable Fourier transform. Another approach to the design of Gaussian shaped filters having a desired sidelobe level using a 40 term cosine series will be presented as well. This approach is again non-iterative and a near equi-ripple sidelobe level filter could be achieved. A deconvolution technique will also be presented. this has the advantage of being non-iterative, simple and fast. This design method produces results comparable to the Dolph-Chebyshev technique.
Ph.D.
Doctorate
Electrical Engineering and Communication
Engineering
Electrical Engineering
41 p.
vii, 41 leaves, bound : ill. ; 28 cm.
Scargall, Lee David. "Very low bit-rate digital video coding." Thesis, University of Newcastle Upon Tyne, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299046.
Повний текст джерелаHaque, S. M. Rafizul. "Singular Value Decomposition and Discrete Cosine Transform based Image Watermarking." Thesis, Blekinge Tekniska Högskola, Avdelningen för för interaktion och systemdesign, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-5269.
Повний текст джерелаPhone number: +88041730212
Chua, Doi-eng, and 蔡岱榮. "Some variations on Discrete-Cosine-Transform-based lossy image compression." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31222523.
Повний текст джерелаDeng, An-Te. "VHDL behavioral description of Discrete Cosine Transform in image compression." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/28641.
Повний текст джерелаWang, Jiun-Lung, and 王俊隴. "EFFICIENT RECURSIVE STRUCTURES FOR DISCRETE COSINES TRANSFORMS." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/10490926827771364154.
Повний текст джерела國立成功大學
電機工程學系
87
Discrete cosine transform (DCT) is widely used in video and image compression. In this thesis, we proposed two new recursive structures for computing DCT. This recursive structure is based on finite impulse response filter (IIR). One kind of them is the IIR form with fixed and selected filter coefficient. The advantage is that it only needs one filter module for computing all DCT components. The other kind is using several IIR structures for concurrent computing DCT components. The advantages are efficiency and high throughput rate. They are also suitable for VLSI implementation because of their regularity and modularity. In thesis, we contribute a VLSI realization with efficient recursion DCT algorithm. We use COMPASS 0.6μm high performance cell library for TSMC SPTM 0.6μm process technology. It integrates about 36k gates in a 4mm 4mm silicon area. The measurement result shows that this chip can operate at 29MHz clock rate.
Su, Yen-hao, and 蘇彥豪. "Trigonometry: Applications of Laws of Sines and Cosines." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/78232252177421734829.
Повний текст джерела國立中山大學
應用數學系研究所
98
Chapter 1 presents the definitions and basic properties of trigonometric functions including: Sum Identities, Difference Identities, Product-Sum Identities and Sum-Product Identities. These formulas provide effective tools to solve the problems in trigonometry. Chapter 2 handles the most important two theorems in trigonometry: The laws of sines and cosines and show how they can be applied to derive many well known theorems including: Ptolemy’s theorem, Euler Triangle Formula, Ceva’s theorem, Menelaus’s Theorem, Parallelogram Law, Stewart’s theorem and Brahmagupta’s Formula. Moreover, the formulas of computing a triangle area like Heron’s formula and Pick’s theorem are also discussed. Chapter 3 deals with the method of superposition, inverse trigonometric functions, polar forms and De Moivre’s Theorem.
Tsai, Hsing-Juan, and 蔡幸娟. "A Parameterizable Architecture for Two-Dimensional Discrete Cosine Transform and Inverse Discrete Cosine Transform." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/66341916946119230484.
Повний текст джерела逢甲大學
資訊工程所
93
The Discrete Cosine Transform (DCT) and Inverse Discrete Cosine Transforms (IDCT) are widely used in various audio and image processing applications. Because of the computation complexity of these algorithms, the dedicated hardware is usually required to achieve the performance of real-time applications. This thesis presents an efficient implementation of a two-dimensional DCT/IDCT processor using a serial-parallel systolic array architecture. The data transfer between processing elements is propagated serially in order to reduce the data communication cost. The data within the processing element is computed in a parallel manner to make the architecture high-speed. By carefully collocating the propagate data in the register of processing element, the transposition operation can be eliminated in this architecture. The block size of 2-D DCT/IDCT and the bit-width of computation data are extracted as parameters that can easily and systematically be adapted to conform to the various imaging coding standard. The behavior and structure model in C language is used to verify the correctness of the 2-D DCT/IDCT computation and the parameterizable implementation. The precision analysis of the 2-D DCT/IDCT implementation was performed by MatLab. The DCT design cost about 14K gate counts when block size is 8 and bit width is 6. The numbers of gate count increase 4 times when block size increases 2 times and those increase about 1.5 times when bit width increases 2 times.
Chung, Chao-yin, and 鐘昭胤. "Cosine Basis Wavelet Filter Desogn." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/91162384113851976339.
Повний текст джерелаHwang, Jen-Jyh, and 黃仁志. "Digital Watermarking by Discrete Cosine Transform." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/99105407359663155102.
Повний текст джерела世新大學
資訊管理學研究所(含碩專班)
98
With the rapid development and extensive use of multimedia and network technology, multimedia protection such as image, audio, video is an urgent issue. It has been widely concerned to view watermarking technology as a powerful tool for copyright protection and safety certification. The paper is based on watermarks hiding creation by Discrete Cosine Transform (DCT) to analyze the robustness of the watermarked images. By not affecting the visually indistinguishable, this research hopes to provide bigger help for the area of watermarks hiding and digital documents.
TUNG, I.-CHIEN, and 董毅前. "Cosine transform coding of weighted images." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/87014671085181684424.
Повний текст джерелаChang, Shih-Ju, and 張仕儒. "Topological Mixing for Cosine Operator Functions." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/26705178749146726724.
Повний текст джерела國立臺中教育大學
數學教育學系
102
A bounded linear operator on a Banach space is called hypercyclic if there is a nonzero vector such that its orbit is dense in the space. Hypercyclicity is close related to a topological notion, topological transitivity. One can also consider transitivity or hypercyclicity for a sequence of operators. In this thesis, we obtain some new results for a sequence of operators which is topological transitive and mixing. Topological mixing is a stronger topological property than topological transitivity, and such a sequence of operators can be regarded as a cosine operator function. Some results in the thesis have been published in a joint paper in [6] with my supervisor. First, we study topological transitivity and hypercyclicity for bilateral weighted forward shifts on l^p(Z). Inspired by the work of Bonilla and Miana, in the second chapter, we consider a cosine operator function induced by a sequence of bounded operators, which is generated by an invertible weighted shift and its inverse. We characterize topologically mixing cosine operator functions in terms of weight. In particular, such a cosine operator function is mixing if, and only if, the weighted shift is mixing. By loosing the weight condition, the sucient condition for such a cosine operator function to be topologically transitive is given. We also provide some necessary conditions for transitive cosine operator functions. Moreover, by using the similar arguments in the main result, we recover the results of Salas, Costakis and Sambarino on the weighted shifts, which unies the proofs of transitivity and mixing for a single operator and a sequence of operators.
SHI, MING-JI, and 施明吉. "L''-convergence of double cosine series." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/13512363816675534021.
Повний текст джерелаChen, Chingson, and 陳慶勳. "Design and Implementation of Discrete Cosine Transform." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/38242894398568802620.
Повний текст джерела國立交通大學
電子研究所
83
Discrete Cosine Transform (DCT) is now used in many communication standards for the removal of redundancies of correlation in random sequences. A random sequence with less correlation could be well compressed after quantisation and entropy coding. Since DCT and its inverse (IDCT) cost much computation power, the design of DCT or IDCT is important in overall system consideration. Traditionally, ROM-Based Distributed Arithmetic (DA) architecture has been used in many commercial systems. Since ROMs cost much area in ROM-Based DA, a new architecture named Adder-Based DA replacing ROMs with serial adders is proposed in this thesis. This new architecture cost much less area than traditionally ROM-Based DA since the ROMs are all replaced by small serial adders. An IDCT chip with 16 mm^2 core area by CCL CMOS standard cells is designed and implemented in this thesis and speed of 98 M pels/ sec is achieved in simulation of VERILOG.
Chen, Ming-Chuan, and 陳明娟. "Intergrability Of Cosine Series With Nonnegative Coefficients." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/76780048620875888416.
Повний текст джерела國立清華大學
數學系
88
We consider the single cosine series with nonnegative coefficients. The estimates of the integral of the function phi of the single cosine series times x with power alpha-1 , alpha is areal number and phi belongs to delta(p,q) for p>1 and p no less then q greater then 0 .Our results generalize a result of Boas .
Liu, Chun-Wen, and 劉仲文. "Adaptive Voltage Scaling for Discrete Cosine Transform." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/00937421266683497648.
Повний текст джерела國立交通大學
電子工程系所
96
In the modern digital IC system, adaptive voltage scaling is the most efficient technology for low power design. A new variable voltage generator (VVG) has been proposed in this paper. Five voltage levels ranged from 0.8V to 1.2V can be generated. An adaptive voltage scaling controller has been developed to fit the VVG to form an adaptive voltage scaling control system. In stead of the off-chip DC-DC converter which is often used in voltage regulation, the on-chip VVG takes an important roll in this system. Discrete Cosine Transform (DCT) has become one of the widely used transform techniques in digital signal processing. The adaptive voltage scaling system has been applied to DCT and reduces at most 45% power consumption of DCT. All simulations are implemented in TSMC0.13-μm CMOS technology.
Tsai, Ya-Ting, and 蔡雅婷. "Object Detection with Integer Discrete Cosine Transform." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/40998194573150464909.
Повний текст джерела中華大學
資訊工程學系碩士班
100
Multimedia technologies, including those for video- and image-related applications, are widely used in various fields, such as security surveillance, medical diagnosis, education, entertainment, and business presentations. Moving objects are of significant interest in surveillance applications. Therefore, detecting the moving objects and identifying their moving trajectories may provide useful information for assuring the security of the monitored site. However, many lighting conditions cause video cameras to record the shadows of moving objects in video images. To identify accurate moving trajectories, the shadows associated with moving objects need to be removed from the recorded video images. Otherwise, false alarm may be triggered, or miscalculation may result. In this thesis, we propose a real-time method for verifying a block belonging to a moving object block or a shadow block. The method includes the following phases. First, we simplify the DCT transformation to construct a novel integer DCT transformation. Second, based on the integer DCT transformed DC and AC coefficients, the background variations are modeled via the GMM probabilistic models. Third, by analyzing the respective variances of the DC and the AC coefficients we can determine the foreground as a moving object or a shadow region. Experimental results show that our method outperforms the conventional methods in terms of accuracy and efficiency.