Browsing by Subject "Wavelets (Mathematics)"

Now showing items 1-20 of 22

    • A recursive approach to multiscalar data interpolation of sparsely sampled sea surface measurements at different spatial resolutions 

      Reig Bolano, Ramon; Garcia Ladona, E.; Parisi Baradad, Vicenç; Marti Puig, Pere (2008)
      Conference report
      Restricted access - publisher's policy
      In many oceanographic studies there is a need to reconstruct a signal from a set of sparse measurements. We propose an algorithm to iteratively approximate the intermediate values between irregularly sampled data, when ...

    • Adaptive self-recurrent wavelet neural network and sliding mode controller/observer for a slider crank mechanism 

      Azar, Ahmad T.; Serrano, Fernando E.; Rossell Garriga, Josep Maria; Vaidyanathan, Sundarapandian; Zhu, Quanmin (InderScience Publishers, 2020-10-03)
      Article
      Open Access
      In this paper, a novel control strategy based on an adaptive Self-Recurrent Wavelet Neural Network (SRWNN) and a sliding mode controller/observer for a slider crank mechanism is proposed. The aim is to reduce the tracking ...

    • An introduction to fault diagnosis of permanent magnet synchronous machines in master's degree courses 

      Riba Ruiz, Jordi-Roger; García Espinosa, Antonio; Romeral Martínez, José Luis; Ortega Redondo, Juan Antonio (John Wiley & Sons, 2010-08-16)
      Article
      Restricted access - publisher's policy
      Early fault detection and diagnosis of high-performance electric motors has been an active area of research for the past two decades. This work presents a practical session that facilitates instructing students in this ...

    • Analysis of turbulent exchange and coherent structures in the stable atmospheric boundary layer based on tower observations 

      Ferreres Soler, Enriqueta; Soler Duffour, María Rosa; Terradellas, Enric (2013-11)
      Article
      Open Access
      Using data collected at the Spanish low troposphere research centre CIBA (Centro de Investigación de la Baja Atmósfera) and at the Cabauw Experimental Site for Atmospheric Research (CESAR) in the Netherlands, we analysed ...

    • Anàlisi espai-temporal multiresolució de matrius de teletrànsit 

      Balasch Fernández, Isaac (Universitat Politècnica de Catalunya, 2010-06-15)
      Bachelor thesis
      Open Access

    • Automatic detection of ECG ventricular activity waves using continuous spline wavelet transform 

      Alvarado Serrano, Carlos; Arregui, J.; Ramos Castro, Juan José; Pallàs-Areny, Ramon (2005)
      Conference report
      Open Access
      In this study, we present detection algorithms of characteristic points of the QRS and T waves based on the continuous wavelet transform (CWT) with splines. This technique can handle any integer scale and the analysis is ...

    • Built in dampers for stayed cables in bridges via SMA. The SMARTeR-ESF project: a mesoscopic and macroscopic experimental analysis with numerical simulations 

      Torra Ferré, Vicenç; Auguet Sangrá, Carlota E.; Isalgué Buxeda, Antonio; Carreras, Guillem; Terriault, Patrick; Lovey, Francisco Carlos (Elsevier, 2013-04)
      Article
      Open Access
      Shape Memory Alloys (SMAs) are good candidates for solid-state dampers appropriate for the oscillations of bridge stay cables because of their large recoverable strain, hysteresis and reasonable fatigue-life. This work ...

    • Credit risk contributions under the Vasicek one-factor model: a fast wavelet expansion approximation 

      Masdemont Soler, Josep; Ortiz-Gracia, Luis (2014-06)
      Article
      Open Access
      To measure the contribution of individual transactions inside the total risk of a credit portfolio is a major issue in financial institutions. VaR Contributions (VaRC) and Expected Shortfall Contributions (ESC) have become ...

    • Estudio y análisis del consumo eléctrico de edificios de uso universitario 

      Pereira Martínez, Francisco Javier (Universitat Politècnica de Catalunya, 2019-05-29)
      Bachelor thesis
      Open Access
      El presente trabajo se centra en el estudio de señales de consumo eléctrico de un edificio universitario mediante unas funciones llamadas wavelets. Se presentarán varias de ellas, aunque se utilizará en todo momento la ...

    • Extraction of vibration parameters from optical feedback interferometry signals using wavelets 

      Jha, Ajit; Azcona Guerrero, Francisco Javier; Yáñez Alvarado, Carlos René; Royo Royo, Santiago (2015-12-01)
      Article
      Open Access
      This paper proposes the use of the wavelet transform as a technique that is suited for fringe detection and analysis of optical feedback interferometry (OFI) signals, thus allowing the retrieval of extremely small physical ...

    • Flexibilities of wavelets as a computational basis set for large-scale electronic structure calculations 

      Ratcliff, Laura E.; Dawson, William; Fisicaro, Giuseppe; Caliste, Damien; Mohr, Stephan; Degomme, Augustin; Videau, Brice; Cristiglio, Viviana; Stella, Martina; D’Alessandro, Marco; Goedecker, Stefan; Nakajima, Takahito; Deutsch, Thierry; Genovese, Luigi (AIP Publishing, 2020)
      Article
      Open Access
      The BigDFT project was started in 2005 with the aim of testing the advantages of using a Daubechies wavelet basis set for Kohn–Sham (KS) density functional theory (DFT) with pseudopotentials. This project led to the creation ...

    • Generalized lifting with adaptive local pdf estimation for image coding 

      Rolon Garrido, Julio Cesar; Mendoça, Eduardo; Salembier Clairon, Philippe Jean (IEEE Press. Institute of Electrical and Electronics Engineers, 2009)
      Conference report
      Open Access
      In this paper we introduce an adaptive local pdf estimation strategy for the construction of Generalized Lifting (GL) mappings in the wavelet domain. Our approach consists in trying to estimate the local pdf of the ...

    • How observed kilometric sandy shoreline undulations depend on wave climate 

      Idier, Déborah; Falqués Serra, Albert; Garcin, Manuel; Rohmer, Jérémy (2018-05-01)
      Article
      Restricted access - publisher's policy
      Idier, D.; Falqués, A.; Garcin, M., and Rohmer, J., 2018. How observed kilometric sandy shoreline undulations depend on wave climate. In: Shim, J.-S.; Chun, I., and Lim, H.S. (eds.), Proceedings from the International ...

    • Model based compressed sensing reconstruction algorithms for ECG telemonitoring in WBANs 

      Lalos, Aristeidis; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos (2014-12-01)
      Article
      Restricted access - publisher's policy
      Wireless Body area networks (WBANs) consist of sensors that continuously monitor and transmit real time vital signals to a nearby coordinator and then to a remote terminal via the Internet. One of the most important signals ...

    • Modeling of contours in wavelet domain for generalized lifting image compression 

      Rolon Garrido, Julio Cesar; Ortega, Antonio; Salembier Clairon, Philippe Jean (2009)
      Conference report
      Open Access
      This paper introduces the design of context-based models of contours in the wavelet domain, which are used to construct generalized lifting (GL) mappings for image compression. The GL context-based mapping may significantly ...

    • Negative-tension instability of scroll waves and Winfree turbulence in the Oregonator model 

      Alonso Muñoz, Sergio; Sagués Mestres, Francesc; Mikhailov, Alexander S (2006-10-06)
      Article
      Open Access
      Excitable media support self-organized scroll waves which can be unstable and give rise to three-dimensional wave chaos. Winfree turbulence of scroll waves results from the negative-tension instability of scroll waves; it ...

    • On wideband deconvolution using wavelet transform 

      Rebollo Neira, Laura; Fernández Rubio, Juan Antonio (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1997-07-31)
      Article
      Open Access
      A discussion on the expression proposed in [1]–[3] for deconvolving the wideband density function is presented. We prove here that such an expression reduces to be proportional to the wideband correlation receiver output, ...

    • Peaks and jumps reconstruction with B-splines scaling functions 

      Ortiz Gracia, Luis; Masdemont Soler, Josep (2014-12-15)
      Article
      Restricted access - publisher's policy
      We consider a methodology based on B-splines scaling functions to numerically invert Fourier or Laplace transforms of functions in the space L-2(R). The original function is approximated by a finite combination of jth order ...

    • Region-based caption text extraction 

      León Cristóbal, Míriam; Vilaplana Besler, Verónica; Gasull Llampallas, Antoni; Marqués Acosta, Fernando (IEEE Press. Institute of Electrical and Electronics Engineers, 2010)
      Conference report
      Open Access
      This paper presents a method for caption text detection. The proposed method will be included in a generic indexing system dealing with other semantic concepts which are to be automatically detected as well. To have a ...

    • The continuous wavelet transform as a maximum entropy solution of the corresponding inverse problem 

      Rebollo Neira, Laura; Fernández Rubio, Juan Antonio (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1999-07-31)
      Article
      Open Access
      The continuous wavelet transform is obtained as a maximum entropy solution of the corresponding inverse problem. It is well known that although a signal can be reconstructed from its wavelet transform, the expansion is ...