subject:( Multifractal geometric support)

1. Darlan Araújo Moreira. Percolação convencional, percolação correlacionada e percolação por invasão num suporte multifractal.

Degree: 2005, Universidade Federal do Rio Grande do Norte

URL: http://bdtd.bczm.ufrn.br/tedesimplificado//tde_busca/arquivo.php?codArquivo=1956

►

Nesta dissertação estudamos o problema da percolação num suporte geométrico multifractal, em suas diferentes versões, e analisamos a conexão deste problema com a percolação convencional… (more)

Subjects/Keywords: Percolação; Formalismo dos fenômenos críticos; Suporte geométrico multifractal; Formalismo dos fenômenos críticos; FISICA; Physics; Percolation; Multifractal geometric support; Conventional percolation; Critical phenomena formalism

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Moreira, D. A. (2005). Percolação convencional, percolação correlacionada e percolação por invasão num suporte multifractal. (Thesis). Universidade Federal do Rio Grande do Norte. Retrieved from http://bdtd.bczm.ufrn.br/tedesimplificado//tde_busca/arquivo.php?codArquivo=1956

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Moreira, Darlan Araújo. “Percolação convencional, percolação correlacionada e percolação por invasão num suporte multifractal.” 2005. Thesis, Universidade Federal do Rio Grande do Norte. Accessed January 15, 2021. http://bdtd.bczm.ufrn.br/tedesimplificado//tde_busca/arquivo.php?codArquivo=1956.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Moreira, Darlan Araújo. “Percolação convencional, percolação correlacionada e percolação por invasão num suporte multifractal.” 2005. Web. 15 Jan 2021.

Vancouver:

Moreira DA. Percolação convencional, percolação correlacionada e percolação por invasão num suporte multifractal. [Internet] [Thesis]. Universidade Federal do Rio Grande do Norte; 2005. [cited 2021 Jan 15]. Available from: http://bdtd.bczm.ufrn.br/tedesimplificado//tde_busca/arquivo.php?codArquivo=1956.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Moreira DA. Percolação convencional, percolação correlacionada e percolação por invasão num suporte multifractal. [Thesis]. Universidade Federal do Rio Grande do Norte; 2005. Available from: http://bdtd.bczm.ufrn.br/tedesimplificado//tde_busca/arquivo.php?codArquivo=1956

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of St. Andrews

2. Mijović, Vuksan. Multifractal zeta functions .

Degree: 2017, University of St. Andrews

URL: http://hdl.handle.net/10023/10637

► Multifractals have during the past 20 − 25 years been the focus of enormous attention in the mathematical literature. Loosely speaking there are two main… (more)

▼ Multifractals have during the past 20 − 25 years been the focus of enormous attention in the mathematical literature. Loosely speaking there are two main ingredients in multifractal analysis: the multifractal spectra and the Renyi dimensions. One of the main goals in multifractal analysis is to understand these two ingredients and their relationship with each other. Motivated by the powerful techniques provided by the use of the Artin-Mazur zeta-functions in number theory and the use of the Ruelle zeta-functions in dynamical systems, Lapidus and collaborators (see books by Lapidus & van Frankenhuysen [32, 33] and the references therein) have introduced and pioneered use of zeta-functions in fractal geometry. Inspired by this development, within the past 7−8 years several authors have paralleled this development by introducing zeta-functions into multifractal geometry. Our result inspired by this work will be given in section 2.2.2. There we introduce geometric multifractal zeta-functions providing precise information of very general classes of multifractal spectra, including, for example, the multifractal spectra of self-conformal measures and the multifractal spectra of ergodic Birkhoff averages of continuous functions. Results in that section are based on paper [37]. Dynamical zeta-functions have been introduced and developed by Ruelle [63, 64] and others, (see, for example, the surveys and books [3, 54, 55] and the references therein). It has been a major challenge to introduce and develop a natural and meaningful theory of dynamical multifractal zeta-functions paralleling existing theory of dynamical zeta functions. In particular, in the setting of self-conformal constructions, Olsen [49] introduced a family of dynamical multifractal zeta-functions designed to provide precise information of very general classes of multifractal spectra, including, for example, the multifractal spectra of self-conformal measures and the multifractal spectra of ergodic Birkhoff averages of continuous functions. However, recently it has been recognised that while self-conformal constructions provide a useful and important framework for studying fractal and multifractal geometry, the more general notion of graph-directed self-conformal constructions provide a substantially more flexible and useful framework, see, for example, [36] for an elaboration of this. In recognition of this viewpoint, in section 2.3.11 we provide main definitions of the multifractal pressure and the multifractal dynamical zeta-functions and we state our main results. This section is based on paper [38]. Setting we are working unifies various different multifractal spectra including fine multifractal spectra of self-conformal measures or Birkhoff averages of continuous function. It was introduced by Olsen in [43]. In section 2.1 we propose answer to problem of defining Renyi spectra in more general settings and provide slight improvement of result regrading multifractal spectra in the case of Subshift of finite type. Advisors/Committee Members: Olsen, Lars (advisor), Todd, Michael John (advisor).

Subjects/Keywords: Multifractal zeta functions; Fine multifractal spectra; Coarse multifractal spectra; Renyi dimension; Geometric zeta function; Dynamical zeta function; Multifractal pressure

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mijović, V. (2017). Multifractal zeta functions . (Thesis). University of St. Andrews. Retrieved from http://hdl.handle.net/10023/10637

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Mijović, Vuksan. “Multifractal zeta functions .” 2017. Thesis, University of St. Andrews. Accessed January 15, 2021. http://hdl.handle.net/10023/10637.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Mijović, Vuksan. “Multifractal zeta functions .” 2017. Web. 15 Jan 2021.

Vancouver:

Mijović V. Multifractal zeta functions . [Internet] [Thesis]. University of St. Andrews; 2017. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/10023/10637.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mijović V. Multifractal zeta functions . [Thesis]. University of St. Andrews; 2017. Available from: http://hdl.handle.net/10023/10637

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Colorado State University

3. Anderson, Leif. Improved methods for calculating the multifractal spectrum for small data sets.

Degree: PhD, Physics, 2014, Colorado State University

URL: http://hdl.handle.net/10217/82579

► There are multiple definitions for fractal dimension, and those definitions disagree. The multifractal spectrum provides a unifying framework for a broad family of definitions of… (more)

Subjects/Keywords: multifractal

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Anderson, L. (2014). Improved methods for calculating the multifractal spectrum for small data sets. (Doctoral Dissertation). Colorado State University. Retrieved from http://hdl.handle.net/10217/82579

Chicago Manual of Style (16^th Edition):

Anderson, Leif. “Improved methods for calculating the multifractal spectrum for small data sets.” 2014. Doctoral Dissertation, Colorado State University. Accessed January 15, 2021. http://hdl.handle.net/10217/82579.

MLA Handbook (7^th Edition):

Anderson, Leif. “Improved methods for calculating the multifractal spectrum for small data sets.” 2014. Web. 15 Jan 2021.

Vancouver:

Anderson L. Improved methods for calculating the multifractal spectrum for small data sets. [Internet] [Doctoral dissertation]. Colorado State University; 2014. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/10217/82579.

Council of Science Editors:

Anderson L. Improved methods for calculating the multifractal spectrum for small data sets. [Doctoral Dissertation]. Colorado State University; 2014. Available from: http://hdl.handle.net/10217/82579

Universidade do Rio Grande do Norte

4. Moreira, Darlan Araújo. Percolação convencional, percolação correlacionada e percolação por invasão num suporte multifractal .

Degree: 2005, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/16539

► In this work we have studied the problem of percolation in a multifractal geometric support, in its diﬀerent versions, and we have analysed the conection… (more)

Subjects/Keywords: Percolação; Formalismo dos fenômenos críticos; Suporte geométrico multifractal; Formalismo dos fenômenos críticos; Physics; Percolation; Multifractal geometric support; Conventional percolation; Critical phenomena formalism

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Moreira, D. A. (2005). Percolação convencional, percolação correlacionada e percolação por invasão num suporte multifractal . (Masters Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/16539

Chicago Manual of Style (16^th Edition):

Moreira, Darlan Araújo. “Percolação convencional, percolação correlacionada e percolação por invasão num suporte multifractal .” 2005. Masters Thesis, Universidade do Rio Grande do Norte. Accessed January 15, 2021. http://repositorio.ufrn.br/handle/123456789/16539.

MLA Handbook (7^th Edition):

Moreira, Darlan Araújo. “Percolação convencional, percolação correlacionada e percolação por invasão num suporte multifractal .” 2005. Web. 15 Jan 2021.

Vancouver:

Moreira DA. Percolação convencional, percolação correlacionada e percolação por invasão num suporte multifractal . [Internet] [Masters thesis]. Universidade do Rio Grande do Norte; 2005. [cited 2021 Jan 15]. Available from: http://repositorio.ufrn.br/handle/123456789/16539.

Council of Science Editors:

Moreira DA. Percolação convencional, percolação correlacionada e percolação por invasão num suporte multifractal . [Masters Thesis]. Universidade do Rio Grande do Norte; 2005. Available from: http://repositorio.ufrn.br/handle/123456789/16539

Universidade do Rio Grande do Norte

5. Moreira, Darlan Araújo. Percolação convencional, percolação correlacionada e percolação por invasão num suporte multifractal .

Degree: 2005, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/16539

► In this work we have studied the problem of percolation in a multifractal geometric support, in its diﬀerent versions, and we have analysed the conection… (more)

Subjects/Keywords: Percolação; Formalismo dos fenômenos críticos; Suporte geométrico multifractal; Formalismo dos fenômenos críticos; Physics; Percolation; Multifractal geometric support; Conventional percolation; Critical phenomena formalism

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Moreira, D. A. (2005). Percolação convencional, percolação correlacionada e percolação por invasão num suporte multifractal . (Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/16539

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Moreira, Darlan Araújo. “Percolação convencional, percolação correlacionada e percolação por invasão num suporte multifractal .” 2005. Thesis, Universidade do Rio Grande do Norte. Accessed January 15, 2021. http://repositorio.ufrn.br/handle/123456789/16539.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Moreira, Darlan Araújo. “Percolação convencional, percolação correlacionada e percolação por invasão num suporte multifractal .” 2005. Web. 15 Jan 2021.

Vancouver:

Moreira DA. Percolação convencional, percolação correlacionada e percolação por invasão num suporte multifractal . [Internet] [Thesis]. Universidade do Rio Grande do Norte; 2005. [cited 2021 Jan 15]. Available from: http://repositorio.ufrn.br/handle/123456789/16539.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Moreira DA. Percolação convencional, percolação correlacionada e percolação por invasão num suporte multifractal . [Thesis]. Universidade do Rio Grande do Norte; 2005. Available from: http://repositorio.ufrn.br/handle/123456789/16539

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

6. Adelakun, Tosin. A multifractal approach for detecting distributed denial of service attacks.

Degree: Electrical and Computer Engineering, 2019, University of Manitoba

URL: http://hdl.handle.net/1993/33820

► Distributed Denial of Service (DDoS) attacks remain a major threat in cybersecurity. Although extensive research has been conducted to detect and prevent DDoS attacks, industry… (more)

▼ Distributed Denial of Service (DDoS) attacks remain a major threat in cybersecurity. Although extensive research has been conducted to detect and prevent DDoS attacks, industry still lacks effective tools and mechanism to achieve that goal. This is mainly due to the mutating (changing) nature of these attacks, as well as the development of new techniques used by the perpetrators of these acts. Traditional methods of dealing with DDoS attacks have proven to be deficient and inefficient in accurately detecting these attacks as most of those techniques were able to classify and detect only known classes of attacks. Therefore, successful identification of these attacks in their early stages is the utmost priority which is yet to be accomplished with all other detection techniques. This thesis addresses some of the challenges of detecting DDoS attacks on a real-time basis. A multifractal approach has been proposed for better and timely detection of DDoS attacks. The approach is based on measuring the complexity of the traffic self-affinity .The detection performance of this technique is compared with their traditional detection mechanisms, and an improvement in performance is reported in terms of time, computational speed, memory or resource usage and accuracy. The evaluation of the limitations of the traditional methods against multifractal approach is also considered. The use of multifractal analysis in detecting DDoS attacks provides an improvement compared to other techniques as a result of the multiscale complexity measures. Since this multiscale relationship exists in the Internet traffic of packets, anomalies can be detected on increasing time scales. This makes it possible to detect the presence of such attacks in the Internet traffic, an important feature that is missing in other current alternative detection techniques. Advisors/Committee Members: Kinsner, Witold (Electrical and Computer Engineering) (supervisor), McNeill, Dean (Electrical and Computer Engineering).

Subjects/Keywords: Multifractal

…multifractal technique that — 2 of 102 — DDoS Detection 1. Introduction is able to accurately… …users. To solve this problem, we introduce the multifractal approach of analyzing Internet… …traditional approach to a multifractal approach which has so far been effective in detecting such… …attacks as they happen (in real- time). The multifractal analysis which started and… …renders a single scale insufficient while multifractal analysis is used to extract the features…

10 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Adelakun, T. (2019). A multifractal approach for detecting distributed denial of service attacks. (Masters Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/33820

Chicago Manual of Style (16^th Edition):

Adelakun, Tosin. “A multifractal approach for detecting distributed denial of service attacks.” 2019. Masters Thesis, University of Manitoba. Accessed January 15, 2021. http://hdl.handle.net/1993/33820.

MLA Handbook (7^th Edition):

Adelakun, Tosin. “A multifractal approach for detecting distributed denial of service attacks.” 2019. Web. 15 Jan 2021.

Vancouver:

Adelakun T. A multifractal approach for detecting distributed denial of service attacks. [Internet] [Masters thesis]. University of Manitoba; 2019. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/1993/33820.

Council of Science Editors:

Adelakun T. A multifractal approach for detecting distributed denial of service attacks. [Masters Thesis]. University of Manitoba; 2019. Available from: http://hdl.handle.net/1993/33820

7. Mezemate, Yacine. Analyse et modélisation multifractales des interactions ondes-turbulence-biologie dans un lac urbain : Multifractal analysis and simulation of turbulence, waves and biochemistry interactions in small urban lakes.

Degree: Docteur es, Sciences et Techniques de l'Environnement, 2014, Université Paris-Est

URL: http://www.theses.fr/2014PEST1166

► Les recherches en milieu lacustre ont généralement porté sur les grands lacs naturels et les barrages. Or les défis scientifiques que présentent les lacs urbains… (more)

▼ Les recherches en milieu lacustre ont généralement porté sur les grands lacs naturels et les barrages. Or les défis scientifiques que présentent les lacs urbains sont nombreux du fait de leur faible profondeur et de leur extension .Le travail que nous présentons ici s'inscrit dans le cadre du projet Petits Lacs Urbains Mesures Modèles Multi-Echelles (PLUMMME), projet financé par la région Île-de-France (programme DIM R2DS).Ce projet a permis l'équipement du lac de Créteil en mesures à haute résolution. Ce sont ces mesures physiques et biologiques qui sont essentiellement exploitées dans cette thèse, parfois en comparaison avec celles du lac du Bourget. La première étape de cette thèse a été ainsi d'enrichir la base de données déjà disponible. Pour cela, nous avons mis en place une station de mesure en continu (capteurs de température, chlorophylle et luminosité, données météorologique telles que vitesse du vent et température atmosphérique), ainsi que deux chaînes de mesures comportant différents capteurs. Des campagnes de mesures spécifiques ont également été réalisées pour l'étude de hydrodynamique à l'aide d'un courantomètre de type Acoustic Doppler Velocimeter (ADV), ainsi qu'un profileur de type Acoustic Doppler Current Profilers (ADCP) à deux points différents du lac (point central et point du rejet d'eaux pluviales). L'analyse des différents champs montre que le lac présente des stratifications avec une période d'une semaine. Nous avons également identifié les modes d'oscillations des ondes internes lorsque ces dernières se produisent sous l'effet du vent. L'analyse spectrale a permis de mettre en évidence une première propriété d'invariance d'échelle des différents champs mesurés. Les différents processus physique (turbulence, stratification, écoulement proche de la paroi) opérant le long de la colonne d'eau ont également été caractérisés. L'analyse spectrale ne permet pas de mettre en évidence le caractère intermittent des fluctuations des champs mesurés, ces dernières peuvent par contre être analysées à l'aide des techniques multifractales. Dans cette thèse nous avons montré que lorsqu'il existe une dépendance entre deux champs, celle ci est multi-échelle. L'utilisation du modèle multifractal universel (UM) a permis de quantifier le degré de cette dépendance. La qualité de l'estimation des paramètres UM dépend fortement de celle de l'invariance d'échelle observée: des séries temporelles présentant des tendances ne respectent pas cette invariance. Les effets de ces dernières sur l'estimation des paramètres UM peuvent être éliminés en utilisant la méthode de décomposition empirique modale dans l'espace physique. L'utilisation des données du champ de vitesse mesuré à l'aide de l'ADCP montre que, les pentes des spectres suivent un profil logarithmique selon la verticale, cela met en évidence que différents processus physiques opèrent le long de la colonne d'eau. Nous montrons également que l'hydrodynamique du lac est fortement perturbée à petite échelle au point du rejet d'eau pluviale. La dernière partie de la… Advisors/Committee Members: Schertzer, Daniel (thesis director).

Subjects/Keywords: Turbulence; Multifractal; Ondes; Turbulence; Multifractal; Waves

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mezemate, Y. (2014). Analyse et modélisation multifractales des interactions ondes-turbulence-biologie dans un lac urbain : Multifractal analysis and simulation of turbulence, waves and biochemistry interactions in small urban lakes. (Doctoral Dissertation). Université Paris-Est. Retrieved from http://www.theses.fr/2014PEST1166

Chicago Manual of Style (16^th Edition):

Mezemate, Yacine. “Analyse et modélisation multifractales des interactions ondes-turbulence-biologie dans un lac urbain : Multifractal analysis and simulation of turbulence, waves and biochemistry interactions in small urban lakes.” 2014. Doctoral Dissertation, Université Paris-Est. Accessed January 15, 2021. http://www.theses.fr/2014PEST1166.

MLA Handbook (7^th Edition):

Mezemate, Yacine. “Analyse et modélisation multifractales des interactions ondes-turbulence-biologie dans un lac urbain : Multifractal analysis and simulation of turbulence, waves and biochemistry interactions in small urban lakes.” 2014. Web. 15 Jan 2021.

Vancouver:

Mezemate Y. Analyse et modélisation multifractales des interactions ondes-turbulence-biologie dans un lac urbain : Multifractal analysis and simulation of turbulence, waves and biochemistry interactions in small urban lakes. [Internet] [Doctoral dissertation]. Université Paris-Est; 2014. [cited 2021 Jan 15]. Available from: http://www.theses.fr/2014PEST1166.

Council of Science Editors:

Mezemate Y. Analyse et modélisation multifractales des interactions ondes-turbulence-biologie dans un lac urbain : Multifractal analysis and simulation of turbulence, waves and biochemistry interactions in small urban lakes. [Doctoral Dissertation]. Université Paris-Est; 2014. Available from: http://www.theses.fr/2014PEST1166

Universidade do Rio Grande do Norte

8. Soares, Roosewelt Fonseca. Fractais e percolação na recuperação de Petróleo .

Degree: 2007, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/16551

► The complex behavior of a wide variety of phenomena that are of interest to physicists, chemists, and engineers has been quantitatively characterized by using the… (more)

▼ The complex behavior of a wide variety of phenomena that are of interest to physicists, chemists, and engineers has been quantitatively characterized by using the ideas of fractal and multifractal distributions, which correspond in a unique way to the geometrical shape and dynamical properties of the systems under study. In this thesis we present the Space of Fractals and the methods of Hausdorff-Besicovitch, box-counting and Scaling to calculate the fractal dimension of a set. In this Thesis we investigate also percolation phenomena in multifractal objects that are built in a simple way. The central object of our analysis is a multifractal object that we call Qmf . In these objects the multifractality comes directly from the geometric tiling. We identify some differences between percolation in the proposed multifractals and in a regular lattice. There are basically two sources of these differences. The first is related to the coordination number, c, which changes along the multifractal. The second comes from the way the weight of each cell in the multifractal affects the percolation cluster. We use many samples of finite size lattices and draw the histogram of percolating lattices against site occupation probability p. Depending on a parameter, ρ, characterizing the multifractal and the lattice size, L, the histogram can have two peaks. We observe that the probability of occupation at the percolation threshold, pc, for the multifractal is lower than that for the square lattice. We compute the fractal dimension of the percolating cluster and the critical exponent β. Despite the topological differences, we find that the percolation in a multifractal support is in the same universality class as standard percolation. The area and the number of neighbors of the blocks of Qmf show a non-trivial behavior. A general view of the object Qmf shows an anisotropy. The value of pc is a function of ρ which is related to its anisotropy. We investigate the relation between pc and the average number of neighbors of the blocks as well as the anisotropy of Qmf. In this Thesis we study likewise the distribution of shortest paths in percolation systems at the percolation threshold in two dimensions (2D). We study paths from one given point to multiple other points. In oil recovery terminology, the given single point can be mapped to an injection well (injector) and the multiple other points to production wells (producers). In the previously standard case of one injection well and one production well separated by Euclidean distance r, the distribution of shortest paths l, P(l|r), shows a power-law behavior with exponent gl = 2.14 in 2D. Here we analyze the situation of one injector and an array A of producers. Symmetric arrays of producers lead to one peak in the distribution P(l|A), the probability that the shortest path between the injector and any of the producers is l, while the asymmetric configurations lead to several peaks in the distribution. We analyze configurations in which the injector is outside and inside the… Advisors/Committee Members: Lucena, Liacir dos Santos (advisor), CPF:00405663404 (advisor), http://lattes.cnpq.br/7151949476055522 (advisor), Corso, Gilberto (advisor), CPF:36990485000 (advisor), http://lattes.cnpq.br/0274040885278760 (advisor).

Subjects/Keywords: Fractais; Multifractal; Percolação; Caminhos mínimos

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Soares, R. F. (2007). Fractais e percolação na recuperação de Petróleo . (Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/16551

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Soares, Roosewelt Fonseca. “Fractais e percolação na recuperação de Petróleo .” 2007. Thesis, Universidade do Rio Grande do Norte. Accessed January 15, 2021. http://repositorio.ufrn.br/handle/123456789/16551.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Soares, Roosewelt Fonseca. “Fractais e percolação na recuperação de Petróleo .” 2007. Web. 15 Jan 2021.

Vancouver:

Soares RF. Fractais e percolação na recuperação de Petróleo . [Internet] [Thesis]. Universidade do Rio Grande do Norte; 2007. [cited 2021 Jan 15]. Available from: http://repositorio.ufrn.br/handle/123456789/16551.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Soares RF. Fractais e percolação na recuperação de Petróleo . [Thesis]. Universidade do Rio Grande do Norte; 2007. Available from: http://repositorio.ufrn.br/handle/123456789/16551

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Miami

9. Lee, Keun J. Geometric Tolerancing of Cylindricity Utilizing Support Vector Regression.

Degree: MS, Industrial Engineering (Engineering), 2009, University of Miami

URL: https://scholarlyrepository.miami.edu/oa_theses/233

► In the age where quick turn around time and high speed manufacturing methods are becoming more important, quality assurance is a consistent bottleneck in… (more)

Subjects/Keywords: Octave; Java; Support Vector Machines; Support Vector Machine; Cylindricity; Geometric Tolerancing; Geometric Tolerance; Support Vector Regression

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lee, K. J. (2009). Geometric Tolerancing of Cylindricity Utilizing Support Vector Regression. (Thesis). University of Miami. Retrieved from https://scholarlyrepository.miami.edu/oa_theses/233

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lee, Keun J. “Geometric Tolerancing of Cylindricity Utilizing Support Vector Regression.” 2009. Thesis, University of Miami. Accessed January 15, 2021. https://scholarlyrepository.miami.edu/oa_theses/233.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lee, Keun J. “Geometric Tolerancing of Cylindricity Utilizing Support Vector Regression.” 2009. Web. 15 Jan 2021.

Vancouver:

Lee KJ. Geometric Tolerancing of Cylindricity Utilizing Support Vector Regression. [Internet] [Thesis]. University of Miami; 2009. [cited 2021 Jan 15]. Available from: https://scholarlyrepository.miami.edu/oa_theses/233.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lee KJ. Geometric Tolerancing of Cylindricity Utilizing Support Vector Regression. [Thesis]. University of Miami; 2009. Available from: https://scholarlyrepository.miami.edu/oa_theses/233

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

10. Brécheteau, Claire. Vers une vision robuste de l'inférence géométrique : Toward a Robust Vision of Geometrical Inference.

Degree: Docteur es, Mathématiques appliquées, 2018, Université Paris-Saclay (ComUE)

URL: http://www.theses.fr/2018SACLS334

►

Le volume de données disponibles est en perpétuelle expansion. Il est primordial de fournir des méthodes efficaces et robustes permettant d'en extraire des informations pertinentes.… (more)

▼

Le volume de données disponibles est en perpétuelle expansion. Il est primordial de fournir des méthodes efficaces et robustes permettant d'en extraire des informations pertinentes. Nous nous focalisons sur des données pouvant être représentées sous la forme de nuages de points dans un certain espace muni d'une métrique, e.g. l'espace Euclidien R^d, générées selon une certaine distribution. Parmi les questions naturelles que l'on peut se poser lorsque l'on a accès à des données, trois d'entre elles sont abordées dans cette thèse. La première concerne la comparaison de deux ensembles de points. Comment décider si deux nuages de points sont issus de formes ou de distributions similaires ? Nous construisons un test statistique permettant de décider si deux nuages de points sont issus de distributions égales (modulo un certain type de transformations e.g. symétries, translations, rotations...). La seconde question concerne la décomposition d'un ensemble de points en plusieurs groupes. Étant donné un nuage de points, comment faire des groupes pertinents ? Souvent, cela consiste à choisir un système de k représentants et à associer chaque point au représentant qui lui est le plus proche, en un sens à définir. Nous développons des méthodes adaptées à des données échantillonnées selon certains mélanges de k distributions, en présence de données aberrantes. Enfin, lorsque les données n'ont pas naturellement une structure en k groupes, par exemple, lorsqu'elles sont échantillonnées à proximité d'une sous-variété de R^d, une question plus pertinente est de construire un système de k représentants, avec k grand, à partir duquel on puisse retrouver la sous-variété. Cette troisième question recouvre le problème de la quantification d'une part, et le problème de l'approximation de la distance à un ensemble d'autre part. Pour ce faire, nous introduisons et étudions une variante de la méthode des k-moyennes adaptée à la présence de données aberrantes dans le contexte de la quantification. Les réponses que nous apportons à ces trois questions dans cette thèse sont de deux types, théoriques et algorithmiques. Les méthodes proposées reposent sur des objets continus construits à partir de distributions et de sous-mesures. Des études statistiques permettent de mesurer la proximité entre les objets empiriques et les objets continus correspondants. Ces méthodes sont faciles à implémenter en pratique lorsque des nuages de points sont à disposition. L'outil principal utilisé dans cette thèse est la fonction distance à la mesure, introduite à l'origine pour adapter les méthodes d'analyse topologique des données à des nuages de points corrompus par des données aberrantes

It is primordial to establish effective and robust methods to extract pertinent information from datasets. We focus on datasets that can be represented as point clouds in some metric space, e.g. Euclidean space R^d; and that are generated according to some distribution. Of the natural questions that may arise when one has access to data, three are addressed in this thesis.…

Advisors/Committee Members: Massart, Pascal (thesis director), Chazal, Frédéric (thesis director).

Subjects/Keywords: Analyse géométrique des données; Distance à la mesure; Tests statistiques; Partitionnement; Quantification; Inférence de support; Geometric data analysis; Distance-To-Measure; Statistical tests; Clustering; Quantization; Support inference

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Brécheteau, C. (2018). Vers une vision robuste de l'inférence géométrique : Toward a Robust Vision of Geometrical Inference. (Doctoral Dissertation). Université Paris-Saclay (ComUE). Retrieved from http://www.theses.fr/2018SACLS334

Chicago Manual of Style (16^th Edition):

Brécheteau, Claire. “Vers une vision robuste de l'inférence géométrique : Toward a Robust Vision of Geometrical Inference.” 2018. Doctoral Dissertation, Université Paris-Saclay (ComUE). Accessed January 15, 2021. http://www.theses.fr/2018SACLS334.

MLA Handbook (7^th Edition):

Brécheteau, Claire. “Vers une vision robuste de l'inférence géométrique : Toward a Robust Vision of Geometrical Inference.” 2018. Web. 15 Jan 2021.

Vancouver:

Brécheteau C. Vers une vision robuste de l'inférence géométrique : Toward a Robust Vision of Geometrical Inference. [Internet] [Doctoral dissertation]. Université Paris-Saclay (ComUE); 2018. [cited 2021 Jan 15]. Available from: http://www.theses.fr/2018SACLS334.

Council of Science Editors:

Brécheteau C. Vers une vision robuste de l'inférence géométrique : Toward a Robust Vision of Geometrical Inference. [Doctoral Dissertation]. Université Paris-Saclay (ComUE); 2018. Available from: http://www.theses.fr/2018SACLS334

11. Roosewelt Fonseca Soares. Fractais e percolação na recuperação de Petróleo.

Degree: 2007, Universidade Federal do Rio Grande do Norte

URL: http://bdtd.bczm.ufrn.br/tedesimplificado//tde_busca/arquivo.php?codArquivo=2419

► The complex behavior of a wide variety of phenomena that are of interest to physicists, chemists, and engineers has been quantitatively characterized by using the… (more)

▼ The complex behavior of a wide variety of phenomena that are of interest to physicists, chemists, and engineers has been quantitatively characterized by using the ideas of fractal and multifractal distributions, which correspond in a unique way to the geometrical shape and dynamical properties of the systems under study. In this thesis we present the Space of Fractals and the methods of Hausdorff-Besicovitch, box-counting and Scaling to calculate the fractal dimension of a set. In this Thesis we investigate also percolation phenomena in multifractal objects that are built in a simple way. The central object of our analysis is a multifractal object that we call Qmf . In these objects the multifractality comes directly from the geometric tiling. We identify some differences between percolation in the proposed multifractals and in a regular lattice. There are basically two sources of these differences. The first is related to the coordination number, c, which changes along the multifractal. The second comes from the way the weight of each cell in the multifractal affects the percolation cluster. We use many samples of finite size lattices and draw the histogram of percolating lattices against site occupation probability p. Depending on a parameter, ρ, characterizing the multifractal and the lattice size, L, the histogram can have two peaks. We observe that the probability of occupation at the percolation threshold, pc, for the multifractal is lower than that for the square lattice. We compute the fractal dimension of the percolating cluster and the critical exponent β. Despite the topological differences, we find that the percolation in a multifractal support is in the same universality class as standard percolation. The area and the number of neighbors of the blocks of Qmf show a non-trivial behavior. A general view of the object Qmf shows an anisotropy. The value of pc is a function of ρ which is related to its anisotropy. We investigate the relation between pc and the average number of neighbors of the blocks as well as the anisotropy of Qmf. In this Thesis we study likewise the distribution of shortest paths in percolation systems at the percolation threshold in two dimensions (2D). We study paths from one given point to multiple other points. In oil recovery terminology, the given single point can be mapped to an injection well (injector) and the multiple other points to production wells (producers). In the previously standard case of one injection well and one production well separated by Euclidean distance r, the distribution of shortest paths l, P(l|r), shows a power-law behavior with exponent gl = 2.14 in 2D. Here we analyze the situation of one injector and an array A of producers. Symmetric arrays of producers lead to one peak in the distribution P(l|A), the probability that the shortest path between the injector and any of the producers is l, while the asymmetric configurations lead to several peaks in the distribution. We analyze configurations in which the injector is outside and inside the… Advisors/Committee Members: Joaquim Elias de Freitas, Murilo Pereira de Almeida, Luciano Rodrigues da Silva, Liacir dos Santos Lucena, Gilberto Corso.

Subjects/Keywords: Fractais; Multifractal; Percolação; Caminhos mínimos; FISICA

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Soares, R. F. (2007). Fractais e percolação na recuperação de Petróleo. (Thesis). Universidade Federal do Rio Grande do Norte. Retrieved from http://bdtd.bczm.ufrn.br/tedesimplificado//tde_busca/arquivo.php?codArquivo=2419

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Soares, Roosewelt Fonseca. “Fractais e percolação na recuperação de Petróleo.” 2007. Thesis, Universidade Federal do Rio Grande do Norte. Accessed January 15, 2021. http://bdtd.bczm.ufrn.br/tedesimplificado//tde_busca/arquivo.php?codArquivo=2419.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Soares, Roosewelt Fonseca. “Fractais e percolação na recuperação de Petróleo.” 2007. Web. 15 Jan 2021.

Vancouver:

Soares RF. Fractais e percolação na recuperação de Petróleo. [Internet] [Thesis]. Universidade Federal do Rio Grande do Norte; 2007. [cited 2021 Jan 15]. Available from: http://bdtd.bczm.ufrn.br/tedesimplificado//tde_busca/arquivo.php?codArquivo=2419.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Soares RF. Fractais e percolação na recuperação de Petróleo. [Thesis]. Universidade Federal do Rio Grande do Norte; 2007. Available from: http://bdtd.bczm.ufrn.br/tedesimplificado//tde_busca/arquivo.php?codArquivo=2419

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universidade do Rio Grande do Norte

12. Dantas, Sérgio Roberto. Proposta de uma nova estrutura multifractal com baixa sensibilidade da frequência de ressonância com relação à periodicidade .

Degree: 2017, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/24417

► Often, frequency selective surfaces have received wide attention from researchers around the world because of their filtering characteristics. These structures evolved in terms of manufacturing.… (more)

Subjects/Keywords: Superfícies seletivas em frequência; Fractal e multifractal

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Dantas, S. R. (2017). Proposta de uma nova estrutura multifractal com baixa sensibilidade da frequência de ressonância com relação à periodicidade . (Masters Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/24417

Chicago Manual of Style (16^th Edition):

Dantas, Sérgio Roberto. “Proposta de uma nova estrutura multifractal com baixa sensibilidade da frequência de ressonância com relação à periodicidade .” 2017. Masters Thesis, Universidade do Rio Grande do Norte. Accessed January 15, 2021. http://repositorio.ufrn.br/handle/123456789/24417.

MLA Handbook (7^th Edition):

Dantas, Sérgio Roberto. “Proposta de uma nova estrutura multifractal com baixa sensibilidade da frequência de ressonância com relação à periodicidade .” 2017. Web. 15 Jan 2021.

Vancouver:

Dantas SR. Proposta de uma nova estrutura multifractal com baixa sensibilidade da frequência de ressonância com relação à periodicidade . [Internet] [Masters thesis]. Universidade do Rio Grande do Norte; 2017. [cited 2021 Jan 15]. Available from: http://repositorio.ufrn.br/handle/123456789/24417.

Council of Science Editors:

Dantas SR. Proposta de uma nova estrutura multifractal com baixa sensibilidade da frequência de ressonância com relação à periodicidade . [Masters Thesis]. Universidade do Rio Grande do Norte; 2017. Available from: http://repositorio.ufrn.br/handle/123456789/24417

Universidade do Rio Grande do Norte

13. Moraes Júnior, Pedro Ricardo Vasconcelos de. Uma origem multifractal para a turbulência no meio interestelar .

Degree: 2017, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/24734

► In recent years studies on complex systems have been gaining strength and tools to be able to simulate and verify their behavior statistically.Much of this… (more)

▼ In recent years studies on complex systems have been gaining strength and tools to be able to simulate and verify their behavior statistically.Much of this is due to many systems that have come to behave in a nonlinear and dissipative way.For these cases conventional geometries such as Euclidean is not possible for the prowess of explaining it, with this the geometry of the fractals emerged as an important alternative for the treatment of this medium,being laws of scales (power) applying very well for this system being exemplified in the form of time series and surfaces (two-dimensional and three-dimensional geometries).Thus a variety of methods were counted for this treatment, among them are the analysis via exponent of Hurst and multifractal analysis.Our work aims to propose a new method to analyze two-dimensional images multifractally, being these images coming from clouds simulations of the interstellar medium.First step was to generate 12 MHD simulations in which they differed from values of pressure and magnetic field, then generated the 2D image that is applied on them the multifractal MFDMA treatment method.With the application of this method it is possible to evaluate the images through a frame containing the exponents of multifractal analysis, being possible to evaluate the scale behavior in the images and verify the degree of complexity, and to find out which sources cause multifractality,using two methods of multifractal analysis that are shuffling the original image data and replacing the original data from the Fourier transform.The results show that for all images the shuffling method can destroy the multifractal source of the original image and still behave like a monofractal,While the other method is ineffective, concluding that nonlinear factors are not included among the sources and indicating as a source of multifractality the long-range correlations. Other important results are the relation of degree of multifractity ∆h with pressure, sonic number of Mach and number of Alfvén. Advisors/Committee Members: Freitas, Daniel Brito de (advisor), 57947139334 (advisor).

Subjects/Keywords: Análise multifractal; Simulações MHD; Turbulência; Meio interestelar

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Moraes Júnior, P. R. V. d. (2017). Uma origem multifractal para a turbulência no meio interestelar . (Masters Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/24734

Chicago Manual of Style (16^th Edition):

Moraes Júnior, Pedro Ricardo Vasconcelos de. “Uma origem multifractal para a turbulência no meio interestelar .” 2017. Masters Thesis, Universidade do Rio Grande do Norte. Accessed January 15, 2021. http://repositorio.ufrn.br/handle/123456789/24734.

MLA Handbook (7^th Edition):

Moraes Júnior, Pedro Ricardo Vasconcelos de. “Uma origem multifractal para a turbulência no meio interestelar .” 2017. Web. 15 Jan 2021.

Vancouver:

Moraes Júnior PRVd. Uma origem multifractal para a turbulência no meio interestelar . [Internet] [Masters thesis]. Universidade do Rio Grande do Norte; 2017. [cited 2021 Jan 15]. Available from: http://repositorio.ufrn.br/handle/123456789/24734.

Council of Science Editors:

Moraes Júnior PRVd. Uma origem multifractal para a turbulência no meio interestelar . [Masters Thesis]. Universidade do Rio Grande do Norte; 2017. Available from: http://repositorio.ufrn.br/handle/123456789/24734

University of Tennessee – Knoxville

14. Roy, Ankur. Scale-dependent heterogeneity in fracture data sets and grayscale images.

Degree: 2013, University of Tennessee – Knoxville

URL: https://trace.tennessee.edu/utk_graddiss/2476

► Lacunarity is a technique developed for multiscale analysis of spatial data and can quantify scale-dependent heterogeneity in a dataset. The present research is based on… (more)

Subjects/Keywords: fractures; scanline; lacunarity; fractal; multifractal; Geology

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Roy, A. (2013). Scale-dependent heterogeneity in fracture data sets and grayscale images. (Doctoral Dissertation). University of Tennessee – Knoxville. Retrieved from https://trace.tennessee.edu/utk_graddiss/2476

Chicago Manual of Style (16^th Edition):

Roy, Ankur. “Scale-dependent heterogeneity in fracture data sets and grayscale images.” 2013. Doctoral Dissertation, University of Tennessee – Knoxville. Accessed January 15, 2021. https://trace.tennessee.edu/utk_graddiss/2476.

MLA Handbook (7^th Edition):

Roy, Ankur. “Scale-dependent heterogeneity in fracture data sets and grayscale images.” 2013. Web. 15 Jan 2021.

Vancouver:

Roy A. Scale-dependent heterogeneity in fracture data sets and grayscale images. [Internet] [Doctoral dissertation]. University of Tennessee – Knoxville; 2013. [cited 2021 Jan 15]. Available from: https://trace.tennessee.edu/utk_graddiss/2476.

Council of Science Editors:

Roy A. Scale-dependent heterogeneity in fracture data sets and grayscale images. [Doctoral Dissertation]. University of Tennessee – Knoxville; 2013. Available from: https://trace.tennessee.edu/utk_graddiss/2476

University of North Texas

15. Olsen, Lars. Multifractal Measures.

Degree: 1994, University of North Texas

URL: https://digital.library.unt.edu/ark:/67531/metadc279084/

► The purpose of this dissertation is to introduce a natural and unifying multifractal formalism which contains the above mentioned multifractal parameters, and gives interesting results… (more)

Subjects/Keywords: Multifractals.; multifractal; measures

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Olsen, L. (1994). Multifractal Measures. (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc279084/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Olsen, Lars. “Multifractal Measures.” 1994. Thesis, University of North Texas. Accessed January 15, 2021. https://digital.library.unt.edu/ark:/67531/metadc279084/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Olsen, Lars. “Multifractal Measures.” 1994. Web. 15 Jan 2021.

Vancouver:

Olsen L. Multifractal Measures. [Internet] [Thesis]. University of North Texas; 1994. [cited 2021 Jan 15]. Available from: https://digital.library.unt.edu/ark:/67531/metadc279084/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Olsen L. Multifractal Measures. [Thesis]. University of North Texas; 1994. Available from: https://digital.library.unt.edu/ark:/67531/metadc279084/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Virginia Tech

16. Zhou, Xiaobo. Fractal and Multifractal Analysis of Runoff Time Series and Stream Networks in Agricultural Watersheds.

Degree: PhD, Crop and Soil Environmental Sciences, 2011, Virginia Tech

URL: http://hdl.handle.net/10919/11287

► The usefulness of watershed hydrological process models is considerably increased when they can be extrapolated across spatial and temporal scales. This scale transfer problem, meaning… (more)

▼ The usefulness of watershed hydrological process models is considerably increased when they can be extrapolated across spatial and temporal scales. This scale transfer problem, meaning the description and prediction of characteristics and processes at a scale different from the one at which observations and measurements are made, and has become the subject of much current research in hydrology and other areas. Quantitative description of fractal scaling behavior of runoff and stream network morphometry in agricultural watersheds has not been previously reported. In the present study, fractal and multifractal scaling of daily runoff rate in four experimental agricultural watersheds and their associated sub-watersheds (32 in total) were investigated. The time series of daily runoff rate were obtained from the database (comprising about 16,600 station years of rainfall and runoff data for small agricultural watersheds across the U.S.) developed by the Hydrological and Remote Sensing Laboratory, Agricultural Research Service, US Department of Agriculture (HRSL/ARS/USDA). Fractal scaling patterns of the Digital Elevation Model (DEM)-extracted stream network morphometry for these four watersheds were also examined. The morphometry of stream networks of four watersheds were obtained by Geographic Information System (GIS) manipulation of digital elevation data downloaded from the most recent (July 2004) U.S. Geological Survey (USGS) National Elevation Dataset (NED). Several threshold values of contribution area for stream initiation were used to extract stream networks for each of the four watersheds. The principal measures of fractal scaling determined for the runoff series were the Hurst exponent obtained by rescaled range (R/S) analysis, the fractal dimension estimated by the shifted box-counting method, and the multifractal scaling function parameters (a and C1) of the Universal Multifractal Model (UMM). Corresponding measures for the DEM-extracted stream networks at each threshold value were the fractal dimension estimated using the box-counting technique and the Horton ratios of the network. Daily runoff rate exhibited strong long-term dependence and scale invariance over certain time scales. The same fractal dimensions and Hurst exponents were obtained for the sub-watersheds within each watershed. Runoff exhibited multifractal behavior that was well described by UMM. The multifractal parameters a (quantifies how far the process is from monofractality) and C1 (characterizes the sparseness or inhomogeneity of the mean of the process) were reasonably close to each other for sub-watersheds within a watershed and were generally similar among four watersheds. For the DEM-extracted networks, the morphometric attributes and Horton ratios as well as their fractal dimensions were dependent on the threshold values of contribution area used in the extraction process. The fractal dimensions were almost identical for DEM-extracted stream networks of the four watersheds. The DEM-extracted stream network displayed a… Advisors/Committee Members: Persaud, Naraine (committeechair), Clark, Ralph (committee member), Pachepsky, Yakov (committee member), Heatwole, Conrad D. (committee member), Alley, Marcus M. (committee member).

Subjects/Keywords: Fractal; Multifractal; Scaling; Stream Network; unoff

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zhou, X. (2011). Fractal and Multifractal Analysis of Runoff Time Series and Stream Networks in Agricultural Watersheds. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/11287

Chicago Manual of Style (16^th Edition):

Zhou, Xiaobo. “Fractal and Multifractal Analysis of Runoff Time Series and Stream Networks in Agricultural Watersheds.” 2011. Doctoral Dissertation, Virginia Tech. Accessed January 15, 2021. http://hdl.handle.net/10919/11287.

MLA Handbook (7^th Edition):

Zhou, Xiaobo. “Fractal and Multifractal Analysis of Runoff Time Series and Stream Networks in Agricultural Watersheds.” 2011. Web. 15 Jan 2021.

Vancouver:

Zhou X. Fractal and Multifractal Analysis of Runoff Time Series and Stream Networks in Agricultural Watersheds. [Internet] [Doctoral dissertation]. Virginia Tech; 2011. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/10919/11287.

Council of Science Editors:

Zhou X. Fractal and Multifractal Analysis of Runoff Time Series and Stream Networks in Agricultural Watersheds. [Doctoral Dissertation]. Virginia Tech; 2011. Available from: http://hdl.handle.net/10919/11287

17. Esdras Adriano Barbosa dos Santos. Estudo de resultados do espectro multifractal da retina humana, como medida de classificação : uma aplicação de análise de agrupamento.

Degree: 2008, Universidade Federal Rural de Pernambuco

URL: http://200.17.137.108/tde_busca/arquivo.php?codArquivo=417

►

A análise de imagens é freqüentemente praticada por oftalmologistas para diagnóstico de doenças. A inspeção da vascularização da retina pode revelar inícios de doenças como… (more)

▼

A análise de imagens é freqüentemente praticada por oftalmologistas para diagnóstico de doenças. A inspeção da vascularização da retina pode revelar inícios de doenças como a retinopatia diabética. Desta forma, existem vários esforços para o desenvolvimento de métodos mais eficazes no diagnóstico destas doenças. A identificação de anormalidades requer uma trabalhosa inspeção de uma grande quantidade das imagens por especialistas. Assim sendo, há necessidade de desenvolvimento de softwares para o auxílio dos oftalmologistas na busca de uma diagnose mais rápida e mais precisa. O uso da dimensão fractal na busca de diferenciação entre retinas com e sem patologias é mais um dos ramos de pesquisa realizados nesta área. Recentemente, foi mostrado que a retina humana não é um fractal simples, mas um multifractal, caracterizado pelo espectro multifractal não trivial. Neste trabalho, foram aplicados métodos de agrupamento nos resultados da análise multifractal para verificar a sensibilidade desta análise na diferenciação entre casos patológicos e casos normais da retina humana. As variáveis usadas são os elementos de espectro multifractal f (a) e dimensões generalizadas D(q), das quais foram escolhidos três conjuntos distintos. Os métodos de agrupamento usados para análise foram o método de Ward, K-médias, PAM e Fuzzy c-means. Como medida para a validação dos grupos obtidos, foiusada a correlação cofenética para o método de Ward e gráficos de silhueta e silhueta média para os métodos K-médias, PAM e Fuzzy c-means. Os resultados mostraram que, para imagens esqueletonizadas, 70-80% das retinas patológicas (dependendo do método e do conjunto de variáveis usadas) foram agrupadas corretamente, enquanto que para as imagens segmentadas originais, o agrupamento não apresentou resultados tão satisfatórios. Este fato indica que a largura dos vasos apresenta menor influência para as conclusões da análise atual, em comparação com o comprimento dos vasos e suas ramificações. Diante disso, é possível concluir que a análise multifractal, aliada ao pré-processamento adequado das imagens e a escolha adequada das variáveis, pode ser utilizada para detecção de casos patológicos ou para o pré-diagnóstico.

Image analysis is frequently used by ophthalmologists as part of the diagnostic procedure. Inspection of the vascular structure of the retina may reveal early stages of pathologies such as diabetic retinopathy, and there have been various efforts to develop more efficient methods for diagnosing such diseases. Currently, identification of abnormalities requires a laborious inspection of a large number of images from the part of specialists, and there is a necessity of automating this process to provide auxiliary diagnostic tools of high speed and precision. One of the lines of research conducted in the direction of differentiating between healthy and pathological retinal images uses the concept of fractal dimension. Recently it was shown that the vascular structure of the human retina is not a simple fractal, but rather a multifractal,…

Advisors/Committee Members: Tatijana Stosic, Borko Stosic.

Subjects/Keywords: Retina; Vascularização; Ciências Agrárias; Clustering Methods; Multifractal; Retina; Vascular Structure; Análise de agrupamento; Multifractal

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Santos, E. A. B. d. (2008). Estudo de resultados do espectro multifractal da retina humana, como medida de classificação : uma aplicação de análise de agrupamento. (Thesis). Universidade Federal Rural de Pernambuco. Retrieved from http://200.17.137.108/tde_busca/arquivo.php?codArquivo=417

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Santos, Esdras Adriano Barbosa dos. “Estudo de resultados do espectro multifractal da retina humana, como medida de classificação : uma aplicação de análise de agrupamento.” 2008. Thesis, Universidade Federal Rural de Pernambuco. Accessed January 15, 2021. http://200.17.137.108/tde_busca/arquivo.php?codArquivo=417.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Santos, Esdras Adriano Barbosa dos. “Estudo de resultados do espectro multifractal da retina humana, como medida de classificação : uma aplicação de análise de agrupamento.” 2008. Web. 15 Jan 2021.

Vancouver:

Santos EABd. Estudo de resultados do espectro multifractal da retina humana, como medida de classificação : uma aplicação de análise de agrupamento. [Internet] [Thesis]. Universidade Federal Rural de Pernambuco; 2008. [cited 2021 Jan 15]. Available from: http://200.17.137.108/tde_busca/arquivo.php?codArquivo=417.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Santos EABd. Estudo de resultados do espectro multifractal da retina humana, como medida de classificação : uma aplicação de análise de agrupamento. [Thesis]. Universidade Federal Rural de Pernambuco; 2008. Available from: http://200.17.137.108/tde_busca/arquivo.php?codArquivo=417

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

18. Esdras Adriano Barbosa dos Santos. Estudo de resultados do espectro multifractal da retina humana, como medida de classificação : uma aplicação de análise de agrupamento.

Degree: 2008, Universidade Federal Rural de Pernambuco

URL: http://200.17.137.108/tde_busca/arquivo.php?codArquivo=417

►

A análise de imagens é freqüentemente praticada por oftalmologistas para diagnóstico de doenças. A inspeção da vascularização da retina pode revelar inícios de doenças como… (more)

▼

A análise de imagens é freqüentemente praticada por oftalmologistas para diagnóstico de doenças. A inspeção da vascularização da retina pode revelar inícios de doenças como a retinopatia diabética. Desta forma, existem vários esforços para o desenvolvimento de métodos mais eficazes no diagnóstico destas doenças. A identificação de anormalidades requer uma trabalhosa inspeção de uma grande quantidade das imagens por especialistas. Assim sendo, há necessidade de desenvolvimento de softwares para o auxílio dos oftalmologistas na busca de uma diagnose mais rápida e mais precisa. O uso da dimensão fractal na busca de diferenciação entre retinas com e sem patologias é mais um dos ramos de pesquisa realizados nesta área. Recentemente, foi mostrado que a retina humana não é um fractal simples, mas um multifractal, caracterizado pelo espectro multifractal não trivial. Neste trabalho, foram aplicados métodos de agrupamento nos resultados da análise multifractal para verificar a sensibilidade desta análise na diferenciação entre casos patológicos e casos normais da retina humana. As variáveis usadas são os elementos de espectro multifractal f (a) e dimensões generalizadas D(q), das quais foram escolhidos três conjuntos distintos. Os métodos de agrupamento usados para análise foram o método de Ward, K-médias, PAM e Fuzzy c-means. Como medida para a validação dos grupos obtidos, foiusada a correlação cofenética para o método de Ward e gráficos de silhueta e silhueta média para os métodos K-médias, PAM e Fuzzy c-means. Os resultados mostraram que, para imagens esqueletonizadas, 70-80% das retinas patológicas (dependendo do método e do conjunto de variáveis usadas) foram agrupadas corretamente, enquanto que para as imagens segmentadas originais, o agrupamento não apresentou resultados tão satisfatórios. Este fato indica que a largura dos vasos apresenta menor influência para as conclusões da análise atual, em comparação com o comprimento dos vasos e suas ramificações. Diante disso, é possível concluir que a análise multifractal, aliada ao pré-processamento adequado das imagens e a escolha adequada das variáveis, pode ser utilizada para detecção de casos patológicos ou para o pré-diagnóstico.

Image analysis is frequently used by ophthalmologists as part of the diagnostic procedure. Inspection of the vascular structure of the retina may reveal early stages of pathologies such as diabetic retinopathy, and there have been various efforts to develop more efficient methods for diagnosing such diseases. Currently, identification of abnormalities requires a laborious inspection of a large number of images from the part of specialists, and there is a necessity of automating this process to provide auxiliary diagnostic tools of high speed and precision. One of the lines of research conducted in the direction of differentiating between healthy and pathological retinal images uses the concept of fractal dimension. Recently it was shown that the vascular structure of the human retina is not a simple fractal, but rather a multifractal,…

Advisors/Committee Members: Tatijana Stosic, Borko Stosic.

Subjects/Keywords: Vascularização; Multifractal; Multifractal; Clustering Methods; Retina; Ciências Agrárias; Retina; Vascular Structure; Análise de agrupamento

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Santos, E. A. B. d. (2008). Estudo de resultados do espectro multifractal da retina humana, como medida de classificação : uma aplicação de análise de agrupamento. (Thesis). Universidade Federal Rural de Pernambuco. Retrieved from http://200.17.137.108/tde_busca/arquivo.php?codArquivo=417

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Santos, Esdras Adriano Barbosa dos. “Estudo de resultados do espectro multifractal da retina humana, como medida de classificação : uma aplicação de análise de agrupamento.” 2008. Thesis, Universidade Federal Rural de Pernambuco. Accessed January 15, 2021. http://200.17.137.108/tde_busca/arquivo.php?codArquivo=417.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Santos, Esdras Adriano Barbosa dos. “Estudo de resultados do espectro multifractal da retina humana, como medida de classificação : uma aplicação de análise de agrupamento.” 2008. Web. 15 Jan 2021.

Vancouver:

Santos EABd. Estudo de resultados do espectro multifractal da retina humana, como medida de classificação : uma aplicação de análise de agrupamento. [Internet] [Thesis]. Universidade Federal Rural de Pernambuco; 2008. [cited 2021 Jan 15]. Available from: http://200.17.137.108/tde_busca/arquivo.php?codArquivo=417.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Santos EABd. Estudo de resultados do espectro multifractal da retina humana, como medida de classificação : uma aplicação de análise de agrupamento. [Thesis]. Universidade Federal Rural de Pernambuco; 2008. Available from: http://200.17.137.108/tde_busca/arquivo.php?codArquivo=417

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

19. Jorge, Lúcio André de Castro. Metodologia de fusão de vídeos e sons para monitoração de comportamento de insetos.

Degree: PhD, Processamento de Sinais de Instrumentação, 2011, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/18/18152/tde-19102011-110608/ ;

►

Este trabalho apresenta uma nova abordagem para fusão de vídeo e som diretamente no espaço de atributos visando otimizar a identificação do comportamento de insetos.… (more)

▼

Este trabalho apresenta uma nova abordagem para fusão de vídeo e som diretamente no espaço de atributos visando otimizar a identificação do comportamento de insetos. Foi utilizado o detector de Harris para rastreamento dos insetos, assim como a técnica inovadora Wavelet-Multifractal para análise de som. No caso da Wavelet-Multifractal, foram testadas várias Wavelet-mães, sendo a Morlet a melhor escolha para sons de insetos. Foi proposto a Wavelet Módulo Máximo para extrair atributos multifractais dos sons para serem utilizados no reconhecimento de padrões de comportamento de insetos. A abordagem Wrapper de mineração de dados foi usada para selecionar os atributos relevantes. Foi constatado que a abordagem Wavelet-multifractal identifica melhor os sons, particularmente no caso de distorções provocadas por ruídos. As imagens foram responsáveis pela identificação de acasalamento e os sons pelos outros comportamentos. Foi também proposto um novo método do triângulo como representação simplificada do espectro multifractal visando simplificação do processamento.

This work presents an innovative video and sound fusion approach by feature subset selection under the space of attributes to optimally identify insects behavior. Harris detector was used for insect movement tracking and an innovative technique of Multifractal-Wavelet was used to analyze the insect sounds. In the case of Multifractal-Wavelet, more than one mother-wavelet was tested, being the Morlet wavelet the best choice of mother-wavelet for insect sounds. The wavelet modulus maxima was proposed to extract multifractal sound attributes to be used in pattern recognition of an insect behavior. The wrapper data mining approach was used to select relevant attributes. It has been found that, in general, wavelet-multifractal based schemes perform better for sound, particularly in terms of minimizing noise distortion influence. The image features only determine the mating and the sound other behaviors. A new triangle representation of multifractal spectrum was proposed as a processing simplification.

Advisors/Committee Members: Obac Roda, Valentin.

Subjects/Keywords: Feature selection; Fusão de sensores; Fusion; Seleção de características; Wavelet-multifractal; Wavelet-multifractal; Wrapper

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Jorge, L. A. d. C. (2011). Metodologia de fusão de vídeos e sons para monitoração de comportamento de insetos. (Doctoral Dissertation). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/18/18152/tde-19102011-110608/ ;

Chicago Manual of Style (16^th Edition):

Jorge, Lúcio André de Castro. “Metodologia de fusão de vídeos e sons para monitoração de comportamento de insetos.” 2011. Doctoral Dissertation, University of São Paulo. Accessed January 15, 2021. http://www.teses.usp.br/teses/disponiveis/18/18152/tde-19102011-110608/ ;.

MLA Handbook (7^th Edition):

Jorge, Lúcio André de Castro. “Metodologia de fusão de vídeos e sons para monitoração de comportamento de insetos.” 2011. Web. 15 Jan 2021.

Vancouver:

Jorge LAdC. Metodologia de fusão de vídeos e sons para monitoração de comportamento de insetos. [Internet] [Doctoral dissertation]. University of São Paulo; 2011. [cited 2021 Jan 15]. Available from: http://www.teses.usp.br/teses/disponiveis/18/18152/tde-19102011-110608/ ;.

Council of Science Editors:

Jorge LAdC. Metodologia de fusão de vídeos e sons para monitoração de comportamento de insetos. [Doctoral Dissertation]. University of São Paulo; 2011. Available from: http://www.teses.usp.br/teses/disponiveis/18/18152/tde-19102011-110608/ ;

University of Toronto

20. Saghir, Hamidreza. Characterizing nonlinear properties of complex signals across time.

Degree: PhD, 2018, University of Toronto

URL: http://hdl.handle.net/1807/91956

► Many real world systems consist of multiple parts and processes that nonlinearly interact with each other at different time scales. Data generated by such systems… (more)

▼ Many real world systems consist of multiple parts and processes that nonlinearly interact with each other at different time scales. Data generated by such systems often contain self-similar structures with proportional scaling of statistical properties across time-scales. It is well known that such structural richness is not captured by conventional statistics like the mean and variance. Development of methods of nonlinear dynamics that quantify complexity, self-similarity, and scaling properties of empirical signals have had a profound impact on our understanding of systems in various scientific domains. In particular, our understanding of physiological systems has undergone a paradigm shift from homeostasis to notions of operation far from equilibrium in physiological regulatory networks. A commonly used methodology for quantifying the scaling relationships is fractal analysis, which estimates the power law exponent, H of time-series fluctuations versus time scales. However, many real world time series are determined by a multitude of exponents which has led to development of multifractal analysis methods. The cornerstone of multifractal analysis has traditionally been the multifractal spectrum which is akin to a probability density of all scaling exponents in the signal. Multifractal spectra are useful for comparing the distributions of exponents in signals. However, a multifractal spectrum does not provide any information about the temporal evolution of scaling structures and therefore, it is less useful in studying dynamic scaling structures. I introduce a set of tools for investigation of scaling structures across time. In particular, I propose scaling maps as a tool that augments the multifractal spectrum with temporal information and then develop a methodology for partitioning of a time series into segments of homogeneous scaling structures. In an attempt to quantify the differences in time local scaling properties of groups of time series, I then introduce Holder histograms as a better representation of time-localized scaling properties scaling structures and propose a feature extraction methodology and statistical tests that lend themselves to quantified comparison of multiple groups of time series in terms of determining their scaling regimes and their temporal dynamics. I then empirically demonstrate the application of the developed methodology on a set of simulated and real world datasets. Result show the ability of the method in recovering scaling modes of complex signals and the quantified discriminative capability of local temporal scaling structures. Advisors/Committee Members: Chau, Tom, Kushki, Azadeh, Biomedical Engineering.

Subjects/Keywords: Detrended fluctuations analysis; Holder exponent; Multifractal analysis; multifractal spectrum; Multiscale entropy; 0541

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Saghir, H. (2018). Characterizing nonlinear properties of complex signals across time. (Doctoral Dissertation). University of Toronto. Retrieved from http://hdl.handle.net/1807/91956

Chicago Manual of Style (16^th Edition):

Saghir, Hamidreza. “Characterizing nonlinear properties of complex signals across time.” 2018. Doctoral Dissertation, University of Toronto. Accessed January 15, 2021. http://hdl.handle.net/1807/91956.

MLA Handbook (7^th Edition):

Saghir, Hamidreza. “Characterizing nonlinear properties of complex signals across time.” 2018. Web. 15 Jan 2021.

Vancouver:

Saghir H. Characterizing nonlinear properties of complex signals across time. [Internet] [Doctoral dissertation]. University of Toronto; 2018. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/1807/91956.

Council of Science Editors:

Saghir H. Characterizing nonlinear properties of complex signals across time. [Doctoral Dissertation]. University of Toronto; 2018. Available from: http://hdl.handle.net/1807/91956

NSYSU

21. Lee, Chuan-pin. D-Optimal Designs for Second-Order Response Surface Models on a Spherical Design Region with Qualitative Factors.

Degree: PhD, Applied Mathematics, 2010, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0204110-011307

► Experiments with both quantitative and qualitative factors always complicate the selections of experimental settings and the statistical analysis for data. Response surface methodology (RSM) provides… (more)

▼ Experiments with both quantitative and qualitative factors always complicate the selections of experimental settings and the statistical analysis for data. Response surface methodology (RSM) provides the systematic procedures such as the steepest ascent method to develop and improve the response models through the optimal settings of quantitative factors. However the sequential method lacks of exploring the direction of the maximum increase in the response among the qualitative levels. In this dissertation the optimal designs for experiments with both qualitative and quantitative factors are investigated. Focused on the second-order response surface model for quantitative factors, which is widely used in RSM as a good approximation for the true response surface, the approximate and exact D-optimal designs are proposed for the model containing the qualitative effects. On spherical design regions, the D-optimal designs have particular structures for considering the qualitative effects to be fixed or random. In this study, the exact D-optimal designs for a second-order response surface model on a circular design region with qualitative factors are proposed. For this model, the interactions between the quantitative and qualitative factors are assumed to be negligible. Based on this design region, an exact D-optimal design with regular polygon structure is made up according to the remainder terms of the numbers of experimental trials at each qualitative levels divided by 6. The complete proofs of exact D-optimality for models including two quantitative factors and one 2-level qualitative factor are presented as well as those for a model with only quantitative factors. When the qualitative factor has more than 2 levels, a method is proposed for constructing exact designs based on the polygonal structure with high efficiency. Furthermore, a procedure for minimizing the number of support points for the quantitative factors of exact D-optimal designs is also proposed for practical consideration. There are no more than 13 support points for the quantitative factors at an individual qualitative level. When the effects between the quantitative and qualitative factors are taken into consideration, approximate D-optimal designs are investigated for models in which the qualitative effects interact with, respectively, the linear quantitative effects, or the linear effects and 2-factor interactions of the quantitative factors or quadratic effects of the quantitative factors. It is shown that, at each qualitative level, the corresponding D-optimal design consists of three portions as a central composite design but with different weights on the cube portion, star portion and center points. Central composite design (CCD) is widely applied in many fields to construct a second-order response surface model with quantitative factors to help to increase the precision of the estimated model. A chemical study is illustrated to show that the effects of the qualitative factor interacts with 2-factor interactions of the quantitative factors are… Advisors/Committee Members: Wen-Jang Huang (chair), Mong-Na Lo Huang (committee member), Mei-Hui Guo (chair), Fu-Chuen Chang (chair), Ching-Kang Ing (chair), Kam-Fai Wong (chair), Ray-Bing Chen (chair).

Subjects/Keywords: minimal-support design; rotatable design; arithmetic-geometric inequality for matrices; central composite design; equivalence theorem; uniform shell design; dispersion function; bile salt experiment; flue gas desulfurization

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lee, C. (2010). D-Optimal Designs for Second-Order Response Surface Models on a Spherical Design Region with Qualitative Factors. (Doctoral Dissertation). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0204110-011307

Chicago Manual of Style (16^th Edition):

Lee, Chuan-pin. “D-Optimal Designs for Second-Order Response Surface Models on a Spherical Design Region with Qualitative Factors.” 2010. Doctoral Dissertation, NSYSU. Accessed January 15, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0204110-011307.

MLA Handbook (7^th Edition):

Lee, Chuan-pin. “D-Optimal Designs for Second-Order Response Surface Models on a Spherical Design Region with Qualitative Factors.” 2010. Web. 15 Jan 2021.

Vancouver:

Lee C. D-Optimal Designs for Second-Order Response Surface Models on a Spherical Design Region with Qualitative Factors. [Internet] [Doctoral dissertation]. NSYSU; 2010. [cited 2021 Jan 15]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0204110-011307.

Council of Science Editors:

Lee C. D-Optimal Designs for Second-Order Response Surface Models on a Spherical Design Region with Qualitative Factors. [Doctoral Dissertation]. NSYSU; 2010. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0204110-011307

22. Nascimento, César Moura. Análise multifractal e seções de Lévy de flutuações heterocedásticas.

Degree: 2008, Universidade Federal de Alagoas

URL: http://www.repositorio.ufal.br/handle/riufal/1012

►

An important problem in Physics concerns the study of stochastic processes and fluctuations away from the mean of dynamical variables. In a wide range of… (more)

▼

An important problem in Physics concerns the study of stochastic processes and fluctuations away from the mean of dynamical variables. In a wide range of systems, some of the observed variables have a macroscopic quality, in the sense that they represent averages or sums over time or space of "microscopic" quantities. When long-range memory or correlation effects do not play a significant role, then the necessary and sufficient conditions for the Central Limit Theorem to hold can become satisfied. Quite often, the second moments of the studied dynamical variable do not diverge, hence in many important instances, the fluctuations of many systems follow Gaussian statistics. On the other hand, complex systems generate some variabilities that often deviate them from Gaussian statistics. Here, we focus on two properties related to Gaussian fluctuations: (i) monofractality and (ii) homoscedasticity. Specifically, we first address the general question about the nature of the relationship between multifractality and heteroscedasticity. We applied multifractal detrended fluctuation analysis to a nonstationary high frequency financial time series obtained from currency markets. As a second test, we applied the technique to the audio time series of Beethoven's fifth symphony. We obtained results suggesting that heteroscedasticity can cause or increase multifractality. We also investigate in greater detail the convergence to the homoskedastic and monofractal Gaussian regime, using the mathematical formalism of Lévy sections, as previously applied to time series. We report several conclusions related to these questions and discuss the generality of these results in the context of the physics of complex systems.

Conselho Nacional de Desenvolvimento Científico e Tecnológico

Um importante problema em Física está relacionado ao estudo de processos estocásticos e flutuações de variáveis dinâmicas. Em uma variedade de sistemas, algumas das variáveis observadas têm uma qualidade macroscópica, no sentido de que elas representam a média ou a soma sobre o espaço ou tempo de quantidades microscópicas. Quando efeitos de memória de longo alcance ou correlação não desempenharem um papel significativo, então as condições necessárias e suficientes para a validade do Teorema do Limite Central podem ser satisfeitas. Frequentemente o segundo momento da variável em questão não diverge. Consequentemente em muitos exemplos importantes, as flutuações de muitos sistemas seguem uma estatística Gaussiana. Em contraste, sistemas complexos geram flutuações que muitas vezes os desviam da estatística Gaussiana. Aqui, nós focamos em duas propriedades relacionadas à flutuações Gaussianas: (i) monofractalidade e (ii) homocedasticidade. Especificamente, discutimos primeiro a questão geral sobre a natureza da relação entre multifractalidade e heterocedasticidade. Aplicamos a multifractal detrended fluctuations analysis a uma série temporal financeira não estacionária e de alta freqüência referente à taxa cambial. Como um segundo teste, aplicamos a…

Advisors/Committee Members: Mohan, Madras Viswanathan Gandhi, CPF:04295882755, http://lattes.cnpq.br/1995273890709490, Gléria, Iram Marcelo, CPF:61990450172, Iram Gleria, Figueiredo Neto, Annibal Dias de, CPF:9999998172, A. Figueiredo, Silva, Eraldo Sergio Barbosa da, CPF:27893081449, Da Silva, Sergio, Lyra, Marcelo Leite, CPF:38421305468, LYRA, M. L., Cressoni, José Carlos, CPF:51203197853, CRESSONI, J. C..

Subjects/Keywords: Econofísica; Séries temporais; Análise multifractal; Econophysics; Time series; Multifractal analysis; CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA::FISICA DA MATERIA CONDENSADA

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Nascimento, C. M. (2008). Análise multifractal e seções de Lévy de flutuações heterocedásticas. (Doctoral Dissertation). Universidade Federal de Alagoas. Retrieved from http://www.repositorio.ufal.br/handle/riufal/1012

Chicago Manual of Style (16^th Edition):

Nascimento, César Moura. “Análise multifractal e seções de Lévy de flutuações heterocedásticas.” 2008. Doctoral Dissertation, Universidade Federal de Alagoas. Accessed January 15, 2021. http://www.repositorio.ufal.br/handle/riufal/1012.

MLA Handbook (7^th Edition):

Nascimento, César Moura. “Análise multifractal e seções de Lévy de flutuações heterocedásticas.” 2008. Web. 15 Jan 2021.

Vancouver:

Nascimento CM. Análise multifractal e seções de Lévy de flutuações heterocedásticas. [Internet] [Doctoral dissertation]. Universidade Federal de Alagoas; 2008. [cited 2021 Jan 15]. Available from: http://www.repositorio.ufal.br/handle/riufal/1012.

Council of Science Editors:

Nascimento CM. Análise multifractal e seções de Lévy de flutuações heterocedásticas. [Doctoral Dissertation]. Universidade Federal de Alagoas; 2008. Available from: http://www.repositorio.ufal.br/handle/riufal/1012

University of Alberta

23. Alausa,Waleem Babatunde. Three Essays on The Application of The Markov Switching Multifractal Model.

Degree: PhD, Department of Economics, 2014, University of Alberta

URL: https://era.library.ualberta.ca/files/cn009w2523

► The overall purpose of this thesis is to extend and apply the Markov Switching Multifractal (MSM) model to various economic problems. To this extent, Chapter… (more)

▼ The overall purpose of this thesis is to extend and apply the Markov Switching Multifractal (MSM) model to various economic problems. To this extent, Chapter 1 lays the ground work for the next chapters by reviewing the MSM model, discussing its properties and outlining its estimation procedures. The chapter also reviews the distributional properties of several commodity markets that make them amenable to the MSM model. Chapter 2 extends the MSM model by incorporating a vector error correction component, which includes in the conditional mean equation, the cointegrating relationship between spot and futures prices. The VECM-MSM model has two distinctive features that incorporate the empirical properties of asset prices. First, it includes an error correction mechanism in the mean equation that incorporates the long-run relationship between spot and futures prices. Second, the model specifies the conditional second moments as a bivariate Markov Switching Multifractal (MSM) model. The VECM-MSM model is applied to study the problem of risk hedging in the futures market. The hedging effectiveness of the proposed VECM-MSM model is evaluated, using a value-at-risk (VaR) approach. Specifically, we compare the hedging effectiveness of the proposed model to those of alternative models by assessing their unconditional and conditional VaR coverages. Models are then ranked in terms of the adequacy and accuracy of their hedged portfolio VaR. The in-sample and out-of-sample hedge effectiveness shows that the VECM-MSM hedged portfolio outperforms alternative hedging strategies in terms of having the lowest rate of VaR violations among the different strategies. Statistical tests of unconditional and conditional coverages also show that the VECM-MSM model better predicts an investor's downside risk in that the VaR predictions are more accurate than the predictions from the alternative models. Chapter 3 of this thesis investigates the excess commodity comovement phenomenon, using the MSM model. One of the stylized facts of commodity prices is their tendency for comovement. The phenomenon implies that seemingly unrelated commodities tend to move together beyond what can be attributed to fundamentals, such as demand and supply conditions, exchange rates, interest rates, industrial production etc. Excess commodity comovement bears significant welfare and risk management implications. For an instance, a synchronous rise in prices of commodities exerts significant inflationary pressure on commodity import dependent countries, and limits their ability to maintain economic stability and resist inflationary pressures. Moreover, to the extent that comovement measures, such as correlation and covariance among commodities, comprise an essential ingredient in risk assessment, pricing, portfolio management and hedging, failure to account for such excess comovement can lead to sub-optimal economic decisions. Therefore within the debate on excess commodity comovement, the objective of this chapter is twofold. First, it analyzes the degree of excess…

Subjects/Keywords: Vector Error Correction; Autoregressive Markov Switching Multifractal; Commodity Comovement; VECM-MSM; ARX-MSM; Electricity Price Forecasting; Markov Switching Multifractal; MSM; Hedging

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Babatunde, A. (2014). Three Essays on The Application of The Markov Switching Multifractal Model. (Doctoral Dissertation). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/cn009w2523

Chicago Manual of Style (16^th Edition):

Babatunde, Alausa,Waleem. “Three Essays on The Application of The Markov Switching Multifractal Model.” 2014. Doctoral Dissertation, University of Alberta. Accessed January 15, 2021. https://era.library.ualberta.ca/files/cn009w2523.

MLA Handbook (7^th Edition):

Babatunde, Alausa,Waleem. “Three Essays on The Application of The Markov Switching Multifractal Model.” 2014. Web. 15 Jan 2021.

Vancouver:

Babatunde A. Three Essays on The Application of The Markov Switching Multifractal Model. [Internet] [Doctoral dissertation]. University of Alberta; 2014. [cited 2021 Jan 15]. Available from: https://era.library.ualberta.ca/files/cn009w2523.

Council of Science Editors:

Babatunde A. Three Essays on The Application of The Markov Switching Multifractal Model. [Doctoral Dissertation]. University of Alberta; 2014. Available from: https://era.library.ualberta.ca/files/cn009w2523

Univerzitet u Beogradu

24. Zeković, Amela Z. 1983-. Fraktalna i multifraktalna karakterizacija 3D video formata.

Degree: Elektrotehnički fakultet, 2016, Univerzitet u Beogradu

URL: https://fedorabg.bg.ac.rs/fedora/get/o:11416/bdef:Content/get

►

Elektrotehnicko inženjerstvo -Telekomunikacije / Electrical Engineering - Telecommunications

Trodimenzionalni (3D) video sadržaj postaje sve prisutniji u saobracaju žicanih i bežicnih mreža. Kako 3D video karakteriše… (more)

Subjects/Keywords: 3D video; burstiness; Hurst parameter; inverse multifractal analysis; complex systems; multifractal spectrum; multiview coding; self-similarity; video transport; video trace

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zeković, A. Z. 1. (2016). Fraktalna i multifraktalna karakterizacija 3D video formata. (Thesis). Univerzitet u Beogradu. Retrieved from https://fedorabg.bg.ac.rs/fedora/get/o:11416/bdef:Content/get

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zeković, Amela Z 1983-. “Fraktalna i multifraktalna karakterizacija 3D video formata.” 2016. Thesis, Univerzitet u Beogradu. Accessed January 15, 2021. https://fedorabg.bg.ac.rs/fedora/get/o:11416/bdef:Content/get.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zeković, Amela Z 1983-. “Fraktalna i multifraktalna karakterizacija 3D video formata.” 2016. Web. 15 Jan 2021.

Vancouver:

Zeković AZ1. Fraktalna i multifraktalna karakterizacija 3D video formata. [Internet] [Thesis]. Univerzitet u Beogradu; 2016. [cited 2021 Jan 15]. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:11416/bdef:Content/get.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zeković AZ1. Fraktalna i multifraktalna karakterizacija 3D video formata. [Thesis]. Univerzitet u Beogradu; 2016. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:11416/bdef:Content/get

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

25. Kim, Semin. Harmonic Maps and the Moduli of Higgs Bundles.

Degree: Department of Mathematics, 2017, Brown University

URL: https://repository.library.brown.edu/studio/item/bdr:733382/

► We study the boundary of the moduli space of Higgs bundles using analytic methods such as harmonic maps and partial differential equations to give new… (more)

Subjects/Keywords: Geometric analysis

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kim, S. (2017). Harmonic Maps and the Moduli of Higgs Bundles. (Thesis). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:733382/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kim, Semin. “Harmonic Maps and the Moduli of Higgs Bundles.” 2017. Thesis, Brown University. Accessed January 15, 2021. https://repository.library.brown.edu/studio/item/bdr:733382/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kim, Semin. “Harmonic Maps and the Moduli of Higgs Bundles.” 2017. Web. 15 Jan 2021.

Vancouver:

Kim S. Harmonic Maps and the Moduli of Higgs Bundles. [Internet] [Thesis]. Brown University; 2017. [cited 2021 Jan 15]. Available from: https://repository.library.brown.edu/studio/item/bdr:733382/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kim S. Harmonic Maps and the Moduli of Higgs Bundles. [Thesis]. Brown University; 2017. Available from: https://repository.library.brown.edu/studio/item/bdr:733382/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

26. Freidin, Brian. Harmonic maps between and into singular spaces.

Degree: Department of Mathematics, 2018, Brown University

URL: https://repository.library.brown.edu/studio/item/bdr:792815/

► We study the roles of domain and target curvatures in harmonic maps into metric spaces with upper curvature bounds. We begin computing the domain and… (more)

Subjects/Keywords: Geometric analysis

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Freidin, B. (2018). Harmonic maps between and into singular spaces. (Thesis). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:792815/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Freidin, Brian. “Harmonic maps between and into singular spaces.” 2018. Thesis, Brown University. Accessed January 15, 2021. https://repository.library.brown.edu/studio/item/bdr:792815/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Freidin, Brian. “Harmonic maps between and into singular spaces.” 2018. Web. 15 Jan 2021.

Vancouver:

Freidin B. Harmonic maps between and into singular spaces. [Internet] [Thesis]. Brown University; 2018. [cited 2021 Jan 15]. Available from: https://repository.library.brown.edu/studio/item/bdr:792815/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Freidin B. Harmonic maps between and into singular spaces. [Thesis]. Brown University; 2018. Available from: https://repository.library.brown.edu/studio/item/bdr:792815/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universidade do Rio Grande do Norte

27. Nepomuceno, Mackson Matheus França. Natureza fractal e multifractal da onda gravitacional GW150914 detectada pelo LIGO .

Degree: 2016, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/22338

► Using the recent observations of the gravitational wave GW150914 produced by the binary black holes coalescing system, the present thesis investigates the fractal and multifractal… (more)

▼ Using the recent observations of the gravitational wave GW150914 produced by the binary black holes coalescing system, the present thesis investigates the fractal and multifractal nature of the temporal variation of the strain measured by the detectors of the Observatory of Gravitational Wave by Laser Interferometry-LIGO. A selection of methods and procedures, such as the R/S andWavelet analysis, as well as the multifractal method denoted by MFDMA, were used to estimate statistical parameters that synthesize the gravitational wave as a complex time series. Whether in the Hanford or Livingston data, the fractal analysis revealed that the series presents a behavior with strong persistence and long-term memory quantified by the Hurst exponent. In addition, the strong agglomeration of the fluctuations found by the R/S analysis indicates the high degree of scale dependence characteristic of a multifractal signal. On the other hand, multifractal analysis using the MFDMA method suggests that the time-series presents a predominance of weak singularities in detriments to the strong, causing an asymmetry in the singularity spectrum D(h). In this context, two types of procedures were performed that analyze the possible sources of multifractality present in the time-series. The results show that procedures point to the existence of two multifractality regimes in the time series separated by the region where the black holes collide, referring to the Hanford data, and, for the Livingston data, near the end of the inspiral phase. Then, the temporal evolution of the multifractal parameters was verified, a process similar to that adopted when applying the R/S analysis. As a result, it was found that, during the evolution of the left lateral diversity of the spectrum D(h), this parameter undergoes a small impulse. The physical origin of this pulse may be associated with the amplitude of the memory derived from the polarization level in relation to the observer’s line of sight. This feature may open the way for a range of speculations, among them, the elasticity of the space-time fabric to be inferred by the multifractal behavior of the gravitational wave. Advisors/Committee Members: Freitas, Daniel Brito de (advisor), 57947139334 (advisor), http://lattes.cnpq.br/2709876077692695 (advisor).

Subjects/Keywords: Análise fractal e multifractal; Séries temporais; Ondas gravitacionais

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Nepomuceno, M. M. F. (2016). Natureza fractal e multifractal da onda gravitacional GW150914 detectada pelo LIGO . (Doctoral Dissertation). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/22338

Chicago Manual of Style (16^th Edition):

Nepomuceno, Mackson Matheus França. “Natureza fractal e multifractal da onda gravitacional GW150914 detectada pelo LIGO .” 2016. Doctoral Dissertation, Universidade do Rio Grande do Norte. Accessed January 15, 2021. http://repositorio.ufrn.br/handle/123456789/22338.

MLA Handbook (7^th Edition):

Nepomuceno, Mackson Matheus França. “Natureza fractal e multifractal da onda gravitacional GW150914 detectada pelo LIGO .” 2016. Web. 15 Jan 2021.

Vancouver:

Nepomuceno MMF. Natureza fractal e multifractal da onda gravitacional GW150914 detectada pelo LIGO . [Internet] [Doctoral dissertation]. Universidade do Rio Grande do Norte; 2016. [cited 2021 Jan 15]. Available from: http://repositorio.ufrn.br/handle/123456789/22338.

Council of Science Editors:

Nepomuceno MMF. Natureza fractal e multifractal da onda gravitacional GW150914 detectada pelo LIGO . [Doctoral Dissertation]. Universidade do Rio Grande do Norte; 2016. Available from: http://repositorio.ufrn.br/handle/123456789/22338

Universidade do Rio Grande do Norte

28. Soares, Roosewelt Fonseca. Fractais e percolação na recuperação de Petróleo .

Degree: 2007, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/16551

► The complex behavior of a wide variety of phenomena that are of interest to physicists, chemists, and engineers has been quantitatively characterized by using the… (more)

▼ The complex behavior of a wide variety of phenomena that are of interest to physicists, chemists, and engineers has been quantitatively characterized by using the ideas of fractal and multifractal distributions, which correspond in a unique way to the geometrical shape and dynamical properties of the systems under study. In this thesis we present the Space of Fractals and the methods of Hausdorff-Besicovitch, box-counting and Scaling to calculate the fractal dimension of a set. In this Thesis we investigate also percolation phenomena in multifractal objects that are built in a simple way. The central object of our analysis is a multifractal object that we call Qmf . In these objects the multifractality comes directly from the geometric tiling. We identify some differences between percolation in the proposed multifractals and in a regular lattice. There are basically two sources of these differences. The first is related to the coordination number, c, which changes along the multifractal. The second comes from the way the weight of each cell in the multifractal affects the percolation cluster. We use many samples of finite size lattices and draw the histogram of percolating lattices against site occupation probability p. Depending on a parameter, ρ, characterizing the multifractal and the lattice size, L, the histogram can have two peaks. We observe that the probability of occupation at the percolation threshold, pc, for the multifractal is lower than that for the square lattice. We compute the fractal dimension of the percolating cluster and the critical exponent β. Despite the topological differences, we find that the percolation in a multifractal support is in the same universality class as standard percolation. The area and the number of neighbors of the blocks of Qmf show a non-trivial behavior. A general view of the object Qmf shows an anisotropy. The value of pc is a function of ρ which is related to its anisotropy. We investigate the relation between pc and the average number of neighbors of the blocks as well as the anisotropy of Qmf. In this Thesis we study likewise the distribution of shortest paths in percolation systems at the percolation threshold in two dimensions (2D). We study paths from one given point to multiple other points. In oil recovery terminology, the given single point can be mapped to an injection well (injector) and the multiple other points to production wells (producers). In the previously standard case of one injection well and one production well separated by Euclidean distance r, the distribution of shortest paths l, P(l|r), shows a power-law behavior with exponent gl = 2.14 in 2D. Here we analyze the situation of one injector and an array A of producers. Symmetric arrays of producers lead to one peak in the distribution P(l|A), the probability that the shortest path between the injector and any of the producers is l, while the asymmetric configurations lead to several peaks in the distribution. We analyze configurations in which the injector is outside and inside the… Advisors/Committee Members: Lucena, Liacir dos Santos (advisor), CPF:00405663404 (advisor), http://lattes.cnpq.br/7151949476055522 (advisor), Corso, Gilberto (advisor), CPF:36990485000 (advisor), http://lattes.cnpq.br/0274040885278760 (advisor).

Subjects/Keywords: Fractais; Multifractal; Percolação; Caminhos mínimos

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Soares, R. F. (2007). Fractais e percolação na recuperação de Petróleo . (Doctoral Dissertation). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/16551

Chicago Manual of Style (16^th Edition):

Soares, Roosewelt Fonseca. “Fractais e percolação na recuperação de Petróleo .” 2007. Doctoral Dissertation, Universidade do Rio Grande do Norte. Accessed January 15, 2021. http://repositorio.ufrn.br/handle/123456789/16551.

MLA Handbook (7^th Edition):

Soares, Roosewelt Fonseca. “Fractais e percolação na recuperação de Petróleo .” 2007. Web. 15 Jan 2021.

Vancouver:

Soares RF. Fractais e percolação na recuperação de Petróleo . [Internet] [Doctoral dissertation]. Universidade do Rio Grande do Norte; 2007. [cited 2021 Jan 15]. Available from: http://repositorio.ufrn.br/handle/123456789/16551.

Council of Science Editors:

Soares RF. Fractais e percolação na recuperação de Petróleo . [Doctoral Dissertation]. Universidade do Rio Grande do Norte; 2007. Available from: http://repositorio.ufrn.br/handle/123456789/16551

Univerzitet u Beogradu

29. Zajić, Goran J. 1972-. Detekcija promena kadrova u video sekvenci primenom multifraktalne analize.

Degree: Elektrotehnički fakultet, 2016, Univerzitet u Beogradu

URL: https://fedorabg.bg.ac.rs/fedora/get/o:11566/bdef:Content/get

►

Elektrotehnika i računarstvo - Telekomunikacije (multimedija) i Obrada signala / Electrical Engineering and Computer Science - Telecommunications (multimedia) and Signal Processing

Moderan i efikasan menadžment… (more)

▼

Elektrotehnika i računarstvo - Telekomunikacije (multimedija) i Obrada signala / Electrical Engineering and Computer Science - Telecommunications (multimedia) and Signal Processing

Moderan i efikasan menadžment video sadržaja podrazumeva mogućnost pretraživanja videa na osnovu automatski generisanih oznaka i informacija dobijenih analizom sadržaja frejmova. Vremenskom segmentacijom videa generiše se hijerarhijska struktura video sadržaja, koja predstavlja osnovu za automatsku anotaciju videa. Prvi korak vremenske segmentacije predstavlja određivanje granica kadrova kao najniže hijerarhijske logičke strukture videa. Kadar predstavlja jedno kontinuirano snimanje kamerom između uključivanja i isključivanja kamere. Grupe kadrova kreiraju više hijejarhijske logičke strukture videa kao sto su: scene, sekvence i programi. Pri detekciji granica kadrova razlikuju se dva osnovna tipa tranzicije izmedju kadrova - nagle i gradijentne promene kadrova. Naglim promenama kadrova nazivaju se tranzicije između kadrova koje traju samo dva frejma, dok kod gradijentnih tranzicija prelazak između dva kadra traje više frejmova. Tema ove disertacije je realizacija algoritma za efikasnu detekciju naglih promena kadrova u video sekvencama različitog sadržaja, dinamike i nivoa postprodukcije. U tu svrhu, sadržaj frejmova video sekvenci opisan je obeležjima za boju i teksturu. Korišćeni su histogram boje i vejvlet obeležje kao elementarna obeležja izdvojena iz frejmova, na lokalnom i globalnom nivou. Odabrana obeležja obezbeđuju sa jedne strane dovoljnu osetljivost na nagle promene vizuelnog sadržaja na frejmovima. Sa druge strane, odabrana obeležja pokazuju određeni nivo tolerancije na promene sadržaja niskog intenziteta, kao što su: kretanje objekata, kamere i promene osvetljenja. Na obeležja frejmova primenjene su dve različite diferencijalne metrike, korelacija i multifraktalna analiza. Korelacija, kao diferencijalna metrika, kombinovanim pristupom je omogućila formiranje specifičnih artefakata koje je jednostavno detektovati u strukturi signala. Artefakti zbog dinamike promena unutar kadrova mogu biti degradirani i pomereni u odnosu na poziciju stvarne nagle promene kadra. Za lokalizaciju nagle promene sadržaja u vremenu primenjena je multifraktalna analiza, tako što je iskorišćena sposobnost ove tehnike da dobro opiše lokalnu strukturu signala. U domenu grubih Hölder-ovih eksponenata multifraktalne analize, nagla promena signala se prikazuje kao lokalni maksimum. Kombinacijom ove dve metrike (ponovi metrike) detektuju se pozicije kandidata naglih promena kadrova. Klasifikacija kandidata izvršena je primenom klasifikatora baziranih na fiksnim pragovima i primenom dobro definisanih pravila. Kao dodatna mera u cilju smanjenja osetljivosti sistema na promene osvetljenja, u algoritam je implementiran i flesh detektor. Realizovani algoritam za detekciju naglih promena kadrova testiran je na velikom broju frejmova (>1.500.000 frejmova), video sekvenci različitih sadržaja, žanrova i tehnologija proizvodnje. Algoritam je pokazao visoke…

Advisors/Committee Members: Reljin, Irini, 1952-.

Subjects/Keywords: abrupt shot changes; artefacts; detection; flash detector; multifractal analysis; video

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zajić, G. J. 1. (2016). Detekcija promena kadrova u video sekvenci primenom multifraktalne analize. (Thesis). Univerzitet u Beogradu. Retrieved from https://fedorabg.bg.ac.rs/fedora/get/o:11566/bdef:Content/get

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zajić, Goran J 1972-. “Detekcija promena kadrova u video sekvenci primenom multifraktalne analize.” 2016. Thesis, Univerzitet u Beogradu. Accessed January 15, 2021. https://fedorabg.bg.ac.rs/fedora/get/o:11566/bdef:Content/get.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zajić, Goran J 1972-. “Detekcija promena kadrova u video sekvenci primenom multifraktalne analize.” 2016. Web. 15 Jan 2021.

Vancouver:

Zajić GJ1. Detekcija promena kadrova u video sekvenci primenom multifraktalne analize. [Internet] [Thesis]. Univerzitet u Beogradu; 2016. [cited 2021 Jan 15]. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:11566/bdef:Content/get.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zajić GJ1. Detekcija promena kadrova u video sekvenci primenom multifraktalne analize. [Thesis]. Univerzitet u Beogradu; 2016. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:11566/bdef:Content/get

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Univerzitet u Beogradu

30. Rajković, Nemanja R., 1986-. Modifikacija fraktalne analize morfologije digitalnih slika neurona pojedinih jedara mozga čoveka i histopatoloških uzoraka tumora dojke.

Degree: 2018, Univerzitet u Beogradu

URL: https://fedorabg.bg.ac.rs/fedora/get/o:18500/bdef:Content/get

►

BIOFIZIKA - FRAKTALNA ANALIZA / Biophysics- Fractal analysis

Kompleksnost i neregularnost objekata koji se sreću u medicinskim istraživanjima pokazuju potrebu za pronalaženjem novih adekvatnih načina… (more)

Subjects/Keywords: fractal analysis; box-count method; neuron images; multifractal analysis; breast cancer

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Rajković, Nemanja R., 1. (2018). Modifikacija fraktalne analize morfologije digitalnih slika neurona pojedinih jedara mozga čoveka i histopatoloških uzoraka tumora dojke. (Thesis). Univerzitet u Beogradu. Retrieved from https://fedorabg.bg.ac.rs/fedora/get/o:18500/bdef:Content/get

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Rajković, Nemanja R., 1986-. “Modifikacija fraktalne analize morfologije digitalnih slika neurona pojedinih jedara mozga čoveka i histopatoloških uzoraka tumora dojke.” 2018. Thesis, Univerzitet u Beogradu. Accessed January 15, 2021. https://fedorabg.bg.ac.rs/fedora/get/o:18500/bdef:Content/get.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Rajković, Nemanja R., 1986-. “Modifikacija fraktalne analize morfologije digitalnih slika neurona pojedinih jedara mozga čoveka i histopatoloških uzoraka tumora dojke.” 2018. Web. 15 Jan 2021.

Vancouver:

Rajković, Nemanja R. 1. Modifikacija fraktalne analize morfologije digitalnih slika neurona pojedinih jedara mozga čoveka i histopatoloških uzoraka tumora dojke. [Internet] [Thesis]. Univerzitet u Beogradu; 2018. [cited 2021 Jan 15]. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:18500/bdef:Content/get.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Rajković, Nemanja R. 1. Modifikacija fraktalne analize morfologije digitalnih slika neurona pojedinih jedara mozga čoveka i histopatoloških uzoraka tumora dojke. [Thesis]. Univerzitet u Beogradu; 2018. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:18500/bdef:Content/get

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

		in
And / Or
		in
And / Or
		in
And / Or
		in

Open Access Theses and Dissertations