Using relational algebra on the specification of real world ETL processes

Modeling Extract-Transform-Load (ETL) processes of a Data Warehousing System has always been a challenge. The heterogeneity of the sources, the quality of the data obtained and the conciliation process are some of the issues that must be addressed in the design phase of this critical component. Commercial ETL tools often provide proprietary diagrammatic components and modeling languages that are not standard, thus not providing the ideal separation between a modeling platform and an execution platform. This separation in conjunction with the use of standard notations and languages is critical in a system that tends to evolve through time and which cannot be undermined by a normally expensive tool that becomes an unsatisfactory component. In this paper we demonstrate the application of Relational Algebra as a modeling language of an ETL system as an effort to standardize operations and provide a basis for uncommon ETL execution platforms.

Recensão de Lee, E. (2005). How internet radio can change the world : an activist’s handbook. Nova Iorque : iUniverse, Inc.

(Excerto) O entusiasmo pela comunicação digital percorre transversalmente a obra How Internet Radio Can Change the World: An Activist’s Handbook, de Eric Lee. Esta postura tão apologista das possibilidades comunicativas oferecidas pela Internet reforça provavelmente um conjunto alargado de entendimentos sobre a conquista do quotidiano pelo digital. Em 1967, McLuhan e Fiore já se referiam aos circuitos eletrónicos como ‘extensões do sistema nervoso central’. Numa leitura mais contemporânea, José Bragança de Miranda refere: “vivemos, nos nossos dias, no meio de conexões, de links, do on‑line, estamos votados à participação, à ‘interactividade’, etc. Algo de novo está a emergir” (2001, p. 265). Maria Teresa Cruz (2001) define a convergência tecnológica das relações sociais como a ‘mobilização erótica da técnica’. Esta obra aqui recenseada pretende, assim, desafiar a utilização da rádio digital para “melhorar a comunicação e solidificar as organizações” (p. 1), em torno de três grupos de reflexão.

Digital literacy, technology and social inclusion: making sense of one-to-one computer programmes around the world

This book was produced in the scope of a research project entitled “Navigating with ‘Magalhães’: Study on the Impact of Digital Media in Schoolchildren”. This study was conducted between May 2010 and May 2013 at the Communication and Society Research Centre, University of Minho, Portugal and it was funded by the Portuguese Foundation for Science and Technology (PTDC/CCI-COM/101381/2008).

Foreword [to Digital literacy, technology and social inclusion: making sense of one-to-one computer programmes around the world]

(Excerto) In times past, learning to read, write and do arithmetic was to get on course to earn the “writ of emancipation” in society. These skills are still essential today, but are not enough to live in society. Reading and critically understanding the world we live in, with all its complexity, difficulties and challenges, require not only other skills (learning to search for and validate information, reading with new codes and grammar, etc) but, to a certain extent, also metaskills, matrixes and mechanisms that are transversal to the different and new literacies, are necessary. They are needed not just to interpret but equally to communicate and participate in the little worlds that make up our everyday activities as well as, in a broader sense, in the world of the polis, which today is a global world.

Introduction [to Digital literacy, technology and social inclusion: making sense of one-to-one computer programmes around the world]

This book was produced in the scope of a research project entitled “Navigating with ‘Magalhães’: Study on the Impact of Digital Media in Schoolchildren”. This study was conducted between May 2010 and May 2013 at the Communication and Society Research Centre, University of Minho, Portugal and it was funded by the Portuguese Foundation for Science and Technology (PTDC/CCI-COM/101381/2008). As we shall explain in more detail later in this book, the main objective of that research project was to analyse the impact of the Portuguese government programme named ´e-escolinha´ launched in 2008 within the Technological Plan for Education. This Plan responds to the principles of the Lisbon Strategy signed in 2000 and rereleased in the Spring European Council of 2005.

Proyectos de olvido y memoria de las víctimas. Aportes inspirados en la «nueva teología política» de Johann Baptist Metz para una hermenéutica del discurso y de la praxis eclesial en relación con la memoria de las víctimas del «proceso de reorganización nacional»

La sociedad argentina vive una revalorización de la memoria en relación con los hechos de la última dictadura militar; simultáneamente, la Iglesia argentina elabora su propia interpretación autocrítica, tomando conciencia de los motivos que configuraron su comportamiento. En la relación Iglesia y «proceso» hay dos momentos: la actuación y el discurso eclesial durante la última dictadura y, concluida ésta, la comprensión que manifiesta sobre la misma, su toma de posición frente a las víctimas, y el pedido de perdón por las culpas del pasado. Investigaciones recientes vinculan la ideología de la seguridad nacional a una autocomprensión de la iglesia ligada al «mito de la nación católica». La teología «académica» argentina, por su parte, prácticamente no ha generado una reflexión a la altura de las circunstancias y del debate general de la sociedad, sobre estos años. Este silencio es en sí mismo una cuestión teológica a ahondar. El objetivo del proyecto es repensar críticamente, a partir de diversos conceptos y perspectivas de la teología de Metz, los discursos y las prácticas institucionales de la Iglesia católica, desde 1981 hasta hoy, en relación con la memoria de las víctimas. Se procura determinar los motivos teológicos y prácticos que dificultaron una oposición efectiva y pública a la violación de los derechos humanos; e individualizar los argumentos que impulsaron un discurso y una praxis de reconciliación que privilegió el olvido de las víctimas y apoyó acríticamente los «proyectos de olvido», como la ley de punto final, los indultos. Para analizar dichos discursos y praxis se recurre principalmente a Metz quien, vinculado a Ernst Bloch y a Walter Benjamin, sus “interlocutores cruciales” y, en general, a la Escuela de Frankfurt, propone, en diálogo crítico con Jürgen Habermas, una razón anamnética del sufrimiento ajeno. La originalidad del proyecto es doble, por su contenido y por su enfoque: la confrontación del «servicio de reconciliación» eclesial con la «memoria de las víctimas».

Animate creation; popular edition of "Our living world" a natural history, by the Rev. J. G. Wood. Revised and adapted to American zoology, by Joseph B. Holder ...

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Animate creation; popular edition of "Our living world" a natural history, by the Rev. J. G. Wood. Revised and adapted to American zoology, by Joseph B. Holder ...

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Animate creation; popular edition of "Our living world" a natural history, by the Rev. J. G. Wood. Revised and adapted to American zoology, by Joseph B. Holder ...

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Medusae of the world, by Alfred Goldsborough Mayer.

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Medusae of the world, by Alfred Goldsborough Mayer.

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Congress of arts and science, Universal exposition, St. Louis, 1904; ed. by Howard J. Rogers.

v. VI

Congress of arts and science, Universal exposition, St. Louis, 1904; ed. by Howard J. Rogers.

v. IV