{"id":73763,"date":"2018-03-09T23:18:42","date_gmt":"2018-03-09T23:18:42","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/new-compression-codes-for-text-databases\/"},"modified":"2018-03-09T23:18:42","modified_gmt":"2018-03-09T23:18:42","slug":"new-compression-codes-for-text-databases","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/matematicas\/new-compression-codes-for-text-databases\/","title":{"rendered":"New compression codes for text databases"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Antonio Fari\u00f1a Martinez <\/strong><\/h2>\n<p>Las bases de datos textuales est\u00e1n creciendo en los \u00faltimos a\u00f1os debido a la proliferaci\u00f3n de las biliotecas digitales, bases de datos documentales, y sobre todo por el gran crecimiento continuado que la web est\u00e1 manteniendo. la comresi\u00f3n surge como una soluci\u00f3n ideal que permite reducir espacio de almacenamiento y las operaciones de e\/s, con el consiguiente beneficio para la transmisi\u00f3n de informaci\u00f3n a trav\u00e9s de una red.  si bien la compresi\u00f3n nace en la primera parte del siglo xx, en la pasada d\u00e9cda aparecen nuevas t\u00e9cnicas de compresi\u00f3n basadas en huffman, que usan las palabrad con los s\u00edmbolos a comprimir. Estas nuevas t\u00e9cnicas no s\u00f3lo mejoran la capacidad de compresi\u00f3n de otros m\u00e9todos muy conocidos (p.Ej: ziv-lempel), sino que adem\u00e1s permiten realizar b\u00fasquedas dentro del texto comprimido, sin necesidad de descomprimirlo, de forma mucho m\u00e1s r\u00e1pida que cuando dichas b\u00fasquedas se realizan sobre el texto plano.  siguiendo con la idea de la compresi\u00f3n basada en palabras, en esta tesis se desarrollan cuatro nuevas t\u00e9cnicas de compresi\u00f3n que dan comienzo a una nueva familia de compresores basados en la utilizaci\u00f3n de c\u00f3digos densos. de estas cuatro t\u00e9cnicas, dos son semiest\u00e1ticas y dos son din\u00e1micas. Sus nombres son: end-tagged dense code, (s,c)-dense code, dynamic end-tagged dense code y dynamic (s,c)-dense code. Adem\u00e1s tambi\u00e9n se ha desarrollado, por primera vez, un compresor din\u00e1mico orientado a bytes y basado en palabras, que usa huffman como esquema de codificaci\u00f3n.  los resultados experimentales obtenidos al comparar nuestros compresores contra corpus reales han demostrado que estos suponen una aportaci\u00f3n relevante en el campo de la compresi\u00f3n, tanto para los sistemas orientados a text retrieval, como en sistemas orientados a la transmisi\u00f3n de datos, ya que nuestros compresores comprimen m\u00e1s y m\u00e1s eficientemente que muchos de los compresores actualmente en uso (gzip, compress, etc).<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>New compression codes for text databases<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 New compression codes for text databases <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Antonio Fari\u00f1a Martinez <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 A coru\u00f1a<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 28\/04\/2005<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Nieves Rodriguez Brisaboa<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal:  Barja p\u00e9rez Jos\u00e9 M\u00aa <\/li>\n<li>josep D\u00edaz cort (vocal)<\/li>\n<li>isidro Ramos salavert (vocal)<\/li>\n<li>nivio Ziviani (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Antonio Fari\u00f1a Martinez Las bases de datos textuales est\u00e1n creciendo en los \u00faltimos a\u00f1os debido a la [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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