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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

On framelets and their applications: a discrete approach

Sze, Chuen-kan., 施泉根. January 2004 (has links)
published_or_final_version / abstract / toc / Mathematics / Doctoral / Doctor of Philosophy
2

Some results in wavelet theory and their applications

張英傑, Cheung, Ying-kit, Alan. January 1997 (has links)
published_or_final_version / Mathematics / Master / Master of Philosophy
3

Some results on biorthogonal wavelet matrices and their applications

黃永樑, Wong, Wing-leung. January 2000 (has links)
published_or_final_version / Mathematics / Master / Master of Philosophy
4

Aproximações multiresolução e bases ortonormais wavelet de L2 (R)

Aseka, Ivanilda Basso January 1995 (has links)
Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciencias Fisicas e Matematica / Made available in DSpace on 2012-10-16T08:47:38Z (GMT). No. of bitstreams: 0Bitstream added on 2016-01-08T19:25:51Z : No. of bitstreams: 1 99946.pdf: 1632897 bytes, checksum: 0e51a6b533c328f8cb3c4ae44abd3845 (MD5) / Estudo da caracterização e propriedades de uma aproximação multiresolução. É mostrada a existência de uma função em L² (R) tal que suas translações e dilatações formam uma base ortonormal da aproximação multiresolução. A caracterização da aproximação multiresolução se dá através de uma função 2p - periódica e, reciprocamente, sob certas condições, podemos, a partir de uma função 2p - periódica, obter uma aproximação multiresolução. É mostrado, também, que, a partir de uma aproximação multiresolução, podemos construir uma função, tal que suas translações e dilatações geram uma base ortonormal de L² (R). Essa função é chamada de Wavelet, e a base gerada de base gerada Wavelet.
5

Frames de wavelets

Rachelli, Janice January 1995 (has links)
Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciencias Fisicas e Matematicas / Made available in DSpace on 2012-10-16T08:49:47Z (GMT). No. of bitstreams: 0Bitstream added on 2016-01-08T19:34:13Z : No. of bitstreams: 1 99949.pdf: 1839807 bytes, checksum: 6c279f29fc4c75b84f85a4b5ddc3df75 (MD5) / Expansões não necessariamente ortogonais de funções no espaço de Hilbert das funções reais quadrado integráveis, através de uma família de funções gerada a partir de uma única função Wavelet. Se a família gera um frame, então para qualquer função f no espaço de Hilbert citado, existe uma expansão semelhante à expansão ortogonal.
6

Some results on biorthogonal wavelet matrices and their applications /

Wong, Wing-leung. January 2000 (has links)
Thesis (M. Phil.)--University of Hong Kong, 2000. / Includes bibliographical references (leaves xiii-xix).
7

Some results in wavelet theory and their applications /

Cheung, Ying-kit, Alan. January 1997 (has links)
Thesis (M. Phil.)--University of Hong Kong, 1998. / Includes bibliographical references (leaf 53).
8

Some results on biorthogonal wavelet matrices and their applications

Wong, Wing-leung. January 2000 (has links)
Thesis (M.Phil.)--University of Hong Kong, 2000. / Includes bibliographical references (leaves xiii-xix) Also available in print.
9

Theory and application of frequency selective wavelets /

Tomas, Brian. January 1992 (has links)
Thesis (Ph. D.)--University of Washington, 1992. / Vita. Includes bibliographical references (leaves [75]-76).
10

Reservoir characterization using wavelet transforms

Rivera Vega, Nestor 30 September 2004 (has links)
Automated detection of geological boundaries and determination of cyclic events controlling deposition can facilitate stratigraphic analysis and reservoir characterization. This study applies the wavelet transformation, a recent advance in signal analysis techniques, to interpret cyclicity, determine its controlling factors, and detect zone boundaries. We tested the cyclostratigraphic assessments using well log and core data from a well in a fluvio-eolian sequence in the Ormskirk Sandstone, Irish Sea. The boundary detection technique was tested using log data from 10 wells in the Apiay field, Colombia. We processed the wavelet coefficients for each zone of the Ormskirk Formation and determined the wavelengths of the strongest cyclicities. Comparing these periodicities with Milankovitch cycles, we found a strong correspondence of the two. This suggests that climate exercised an important control on depositional cyclicity, as had been concluded in previous studies of the Ormskirk Sandstone. The wavelet coefficients from the log data in the Apiay field were combined to form features. These vectors were used in conjunction with pattern recognition techniques to perform detection in 7 boundaries. For the upper two units, the boundary was detected within 10 feet of their actual depth, in 90% of the wells. The mean detection performance in the Apiay field is 50%. We compared our method with other traditional techniques which do not focus on selecting optimal features for boundary identification. Those methods resulted in detection performances of 40% for the uppermost boundary, which lag behind the 90% performance of our method. Automated determination of geologic boundaries will expedite studies, and knowledge of the controlling deposition factors will enhance stratigraphic and reservoir characterization models. We expect that automated boundary detection and cyclicity analysis will prove to be valuable and time-saving methods for establishing correlations and their uncertainties in many types of oil and gas reservoirs, thus facilitating reservoir exploration and management.

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