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  • Fusion cubes: towards self-service business intelligence

     Abello Gamazo, Alberto; Darmont, Jerome; Etcheverry, Lorena; Golfarelli, Matteo; Mazon, Jose Norberto; Naumann, Felix; Pedersen, Torben; Rizzi Bach, Stefano; Trujillo Mondejar, Juan Carlos; Vassiliadis, Panos; Vossen, Gottfried
    International journal of data warehousing and mining
    Date of publication: 2013
    Journal article

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    Self-service business intelligence is about enabling non-expert users to make well-informed decisions by enriching the decision process with situational data, i.e., data that have a narrow focus on a specific business problem and, typically, a short lifespan for a small group of users. Often, these data are not owned and controlled by the decision maker; their search, extraction, integration, and storage for reuse or sharing should be accomplished by decision makers without any intervention by designers or programmers. The goal of this paper is to present the framework we envision to support self-service business intelligence and the related research challenges; the underlying core idea is the notion of fusion cubes, i.e., multidimensional cubes that can be dynamically extended both in their schema and their instances, and in which situational data and metadata are associated with quality and provenance annotations.

  • Improving learning in a database course using collaborative learning techniques

     Martin Escofet, Carme; Urpi Tubella, Antoni; Casañ Guerrero, Maria Jose; Burgues Illa, Xavier; Quer, Carme; Rodríguez González, M. Elena; Abello Gamazo, Alberto
    International journal of engineering education
    Date of publication: 2013
    Journal article

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    In recent years European universities have been adapting their curricula to the new European Higher Education Area, which implies the use of active learning methodologies. In most database courses, project-based learning is the active methodology that is widelyused, but the authors of this paper face context constraints against its use. This paper presents a quantitative and qualitative analysis of the results obtained from the use of collaborative learning in both cross-curricula competences and subject-specific ones in the ``Introduction to Databases¿¿ course at the Barcelona School of Informatics. Relevantly, this analysis demonstrates the positive impact that this methodology had, allowing us to conclude that it is not only project-based learning that is suitable for these kinds of courses.

  • Open access semantic aware business intelligence

     Romero Moral, Oscar; Abello Gamazo, Alberto
    European Business Intelligence Summer School
    Presentation's date: 2013-07-08
    Presentation of work at congresses

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    The vision of an interconnected and open Web of data is, still, a chimera far from being accomplished. Fortunately, though, one can find several evidences in this direction and despite the technical challenges behind such approach recent advances have shown its feasibility. Semantic-aware formalisms (such as RDF and ontology languages) have been successfully put in practice in approaches such as Linked Data, whereas movements like Open Data have stressed the need of a new open access paradigm to guarantee free access to Web data. In front of such promising scenario, traditional business intelligence (BI) techniques and methods have been shown not to be appropriate. BI was born to support decision making within the organizations and the data warehouse, the most popular IT construct to support BI, has been typically nurtured with data either owned or accessible within the organization. With the new linked open data paradigm BI systems must meet new requirements such as providing on-demand analysis tasks over any relevant (either internal or external) data source in right-time. In this paper we discuss the technical challenges behind such requirements, which we refer to as exploratory BI, and envision a new kind of BI system to support this scenario.

  • Ontology driven search of compound IDs

     Abello Gamazo, Alberto; Romero Moral, Oscar
    Knowledge and information systems
    Date of publication: 2012-07
    Journal article

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  • Service-oriented business intelligence

     Abello Gamazo, Alberto; Romero Moral, Oscar
    Date of publication: 2012
    Book chapter

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    The traditional way to manage Information Technologies (IT) in the companies is having a data center, and licensing monolithic applications based on the number of CPUs, allowed connections, etc. This also holds for Business Intelligence environments. Nevertheless, technologies have evolved and today other approaches are possible. Specifically, the service paradigm allows to outsource hardware as well as software in a pay-as-you-go model.

    The traditional way to manage Information Technologies (IT) in the companies is having a data center, and licensing monolithic applications based on the number of CPUs, allowed connections, etc. This also holds for Business Intelligence environments. Nevertheless, technologies have evolved and today other approaches are possible. Specifically, the service paradigm allows to outsource hardware as well as software in a pay-as-you-go model.

  • ORE: an iterative approach to the design and evolution of multi-dimensional schemas

     Jovanovic, Petar; Romero Moral, Oscar; Simitsis, Alkis; Abello Gamazo, Alberto
    International Workshop On Data Warehousing and OLAP
    Presentation of work at congresses

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    Avaluació de la incorporació d'activitats d'aprenentatge actiu i cooperatiu a les assignatures de bases de dades de la Facultat d'Informàtica de Barcelona  Open access

     Martin Escofet, Carme; Urpi Tubella, Antoni; Abello Gamazo, Alberto; Burgues Illa, Xavier; Casañ Guerrero, Maria Jose; Quer, Carme; Rodriguez Gonzalez, M. Elena
    Congrés Internacional de Docència Universitària i Innovació
    Presentation's date: 2012-07-04
    Presentation of work at congresses

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  • Requirement-driven creation and deployment of multidimensional and ETL designs

     Jovanovic, Petar; Romero Moral, Oscar; Simitsis, Alkis; Abello Gamazo, Alberto
    International Conference on Conceptual Modeling
    Presentation's date: 2012
    Presentation of work at congresses

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  • Integrating ETL processes from information requirements

     Romero Moral, Oscar; Jovanovic, Petar; Simitsis, Alkis; Abello Gamazo, Alberto
    International Conference on Data Warehousing and Knowledge Discovery
    Presentation's date: 2012
    Presentation of work at congresses

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  • Interoperability platform for virtual and remote laboratories

     Fernández Ruzafa, Jose; Bragos Bardia, Ramon; Cabrera Bean, Margarita Asuncion; Abello Gamazo, Alberto; Arroyo Luna, Neus; Gonzalez Lareo, Daniel; Garofano, Francesc; Cortes, Antonia; Fabra, Alex
    International Conference on Remote Engineering and Virtual Instrumentation
    Presentation's date: 2012-07-06
    Presentation of work at congresses

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  • Multidimensional design methods for data warehousing

     Romero Moral, Oscar; Abello Gamazo, Alberto
    Date of publication: 2011
    Book chapter

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  • Semantic web technologies for business intelligence

     Berlanga, Rafael; Romero Moral, Oscar; Simitsis, Alkis; Nebot, Victoria; Pedersen, Torben; Abello Gamazo, Alberto; Aramburu, María José
    Date of publication: 2011
    Book chapter

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  • NoSQL: the death of the star

     Abello Gamazo, Alberto
    Journées Francophones sur les Entrepôts de Données et l'Analyse en Ligne
    Presentation's date: 2011-06-08
    Presentation of work at congresses

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  • Describing analytical sessions using a multidimensional algebra

     Romero Moral, Oscar; Marcel, Patrick; Abello Gamazo, Alberto; Peralta, Verónika; Bellatreche, Ladjel
    International Conference on Data Warehousing and Knowledge Discovery
    Presentation's date: 2011-09-02
    Presentation of work at congresses

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  • Data-driven multidimensional design for OLAP

     Romero Moral, Oscar; Abello Gamazo, Alberto
    International Conference on Scientific and Statistical Database Management
    Presentation's date: 2011-07-21
    Presentation of work at congresses

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  • Building cubes with MapReduce

     Abello Gamazo, Alberto; Ferrarons, Jaume; Romero Moral, Oscar
    International Workshop On Data Warehousing and OLAP
    Presentation's date: 2011-10-28
    Presentation of work at congresses

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  • GEM: requirement-driven generation of ETL and multidimensional conceptual designs

     Romero Moral, Oscar; Simitsis, Alkis; Abello Gamazo, Alberto
    International Conference on Data Warehousing and Knowledge Discovery
    Presentation's date: 2011-08-29
    Presentation of work at congresses

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  • A comprehensive framework on multidimensional modeling

     Romero Moral, Oscar; Abello Gamazo, Alberto
    International Conference on Conceptual Modeling
    Presentation's date: 2011-10-31
    Presentation of work at congresses

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  • Puntuación entre iguales para la evaluación del trabajo en equipo  Open access

     Abello Gamazo, Alberto; Burgues Illa, Xavier
    Jornadas de Enseñanza Universitaria de la Informática
    Presentation's date: 2011-07-06
    Presentation of work at congresses

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    La entrada en el EEES y la adopción de un sistema de evaluación basado en competencias, algunas de ellas no técnicas, hace que nos tengamos que plantear algún tipo de cambio, no solo en la forma de enseñar, sino también en la forma de evaluación. Evaluar, por ejemplo, la actitud ante el trabajo, el trabajo en equipo o la capacidad de innovación mediante un examen resulta a todas luces poco apropiado, si no imposible. Es en este sentido que hemos experimentado durante dos semestres la posibilidad de evaluación entre iguales para la competencia genérica “trabajo en equipo”. En este trabajo, presentamos la experiencia y conclusiones extraídas

  • Adaptació de LEARN-SQL a l'Espai Europeu d'Educació Superior (EEES)  Open access

     Urpi Tubella, Antoni; Abello Gamazo, Alberto; Burgues Illa, Xavier; Casañ Guerrero, Maria Jose; Martin Escofet, Carme; Quer, Carme; Rodriguez Gonzalez, M. Elena
    Jornada d'Innovació Docent UPC
    Presentation's date: 2011-02-02
    Presentation of work at congresses

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  • A framework for multidimensional design of data warehouses from ontologies

     Romero Moral, Oscar; Abello Gamazo, Alberto
    Data and knowledge engineering
    Date of publication: 2010-11
    Journal article

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  • Automatic validation of requirements to support multidimensional design

     Romero Moral, Oscar; Abello Gamazo, Alberto
    Data and knowledge engineering
    Date of publication: 2010-09
    Journal article

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  • Data warehousing and OLAP (DOLAP'08)

     Abello Gamazo, Alberto; Song, Il-Yeong
    Data and knowledge engineering
    Date of publication: 2010-01
    Journal article

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  • Database design and administration

     Abello Gamazo, Alberto; Rollon Rico, Emma; Rodríguez González, M. Elena
    Date of publication: 2010-09
    Book

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    GEM: requirement-driven generation of ETL and multidimensional conceptual designs  Open access

     Romero Moral, Oscar; Simitsis, Alkis; Abello Gamazo, Alberto
    Date: 2010-10-21
    Report

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    At the early stages of a data warehouse design project, the main objective is to collect the business requirements and needs, and translate them into an appropriate conceptual, multidimensional design. Typically, this task is performed manually, through a series of interviews involving two different parties: the business analysts and technical designers. Producing an appropriate conceptual design is an errorprone task that undergoes several rounds of reconciliation and redesigning, until the business needs are satisfied. It is of great importance for the business of an enterprise to facilitate and automate such a process. The goal of our research is to provide designers with a semi-automatic means for producing conceptual multidimensional designs and also, conceptual representation of the extract-transform-load (ETL)processes that orchestrate the data flow from the operational sources to the data warehouse constructs. In particular, we describe a method that combines information about the data sources along with the business requirements, for validating and completing –if necessary– these requirements, producing a multidimensional design, and identifying the ETL operations needed. We present our method in terms of the TPC-DS benchmark and show its applicability and usefulness.

  • Using ontologies to discover fact IDs

     Abello Gamazo, Alberto; Romero Moral, Oscar
    International Workshop On Data Warehousing and OLAP
    Presentation's date: 2010-11-26
    Presentation of work at congresses

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  • Automating the multidimensional design of data warehouses  Open access

     Romero Moral, Oscar
    Defense's date: 2010-02-09
    Department of Software, Universitat Politècnica de Catalunya
    Theses

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    Les experiències prèvies en l'àmbit dels magatzems de dades (o data warehouse), mostren que l'esquema multidimensional del data warehouse ha de ser fruit d'un enfocament híbrid; això és, una proposta que consideri tant els requeriments d'usuari com les fonts de dades durant el procés de disseny.Com a qualsevol altre sistema, els requeriments són necessaris per garantir que el sistema desenvolupat satisfà les necessitats de l'usuari. A més, essent aquest un procés de reenginyeria, les fonts de dades s'han de tenir en compte per: (i) garantir que el magatzem de dades resultant pot ésser poblat amb dades de l'organització, i, a més, (ii) descobrir capacitats d'anàlisis no evidents o no conegudes per l'usuari.Actualment, a la literatura s'han presentat diversos mètodes per donar suport al procés de modelatge del magatzem de dades. No obstant això, les propostes basades en un anàlisi dels requeriments assumeixen que aquestos són exhaustius, i no consideren que pot haver-hi informació rellevant amagada a les fonts de dades. Contràriament, les propostes basades en un anàlisi exhaustiu de les fonts de dades maximitzen aquest enfocament, i proposen tot el coneixement multidimensional que es pot derivar des de les fonts de dades i, conseqüentment, generen massa resultats. En aquest escenari, l'automatització del disseny del magatzem de dades és essencial per evitar que tot el pes de la tasca recaigui en el dissenyador (d'aquesta forma, no hem de confiar únicament en la seva habilitat i coneixement per aplicar el mètode de disseny elegit). A més, l'automatització de la tasca allibera al dissenyador del sempre complex i costós anàlisi de les fonts de dades (que pot arribar a ser inviable per grans fonts de dades).Avui dia, els mètodes automatitzables analitzen en detall les fonts de dades i passen per alt els requeriments. En canvi, els mètodes basats en l'anàlisi dels requeriments no consideren l'automatització del procés, ja que treballen amb requeriments expressats en llenguatges d'alt nivell que un ordenador no pot manegar. Aquesta mateixa situació es dona en els mètodes híbrids actual, que proposen un enfocament seqüencial, on l'anàlisi de les dades es complementa amb l'anàlisi dels requeriments, ja que totes dues tasques pateixen els mateixos problemes que els enfocament purs.En aquesta tesi proposem dos mètodes per donar suport a la tasca de modelatge del magatzem de dades: MDBE (Multidimensional Design Based on Examples) and AMDO (Automating the Multidimensional Design from Ontologies). Totes dues consideren els requeriments i les fonts de dades per portar a terme la tasca de modelatge i a més, van ser pensades per superar les limitacions dels enfocaments actuals.1. MDBE segueix un enfocament clàssic, en el que els requeriments d'usuari són coneguts d'avantmà. Aquest mètode es beneficia del coneixement capturat a les fonts de dades, però guia el procés des dels requeriments i, conseqüentment, és capaç de treballar sobre fonts de dades semànticament pobres. És a dir, explotant el fet que amb uns requeriments de qualitat, podem superar els inconvenients de disposar de fonts de dades que no capturen apropiadament el nostre domini de treball.2. A diferència d'MDBE, AMDO assumeix un escenari on es disposa de fonts de dades semànticament riques. Per aquest motiu, dirigeix el procés de modelatge des de les fonts de dades, i empra els requeriments per donar forma i adaptar els resultats generats a les necessitats de l'usuari. En aquest context, a diferència de l'anterior, unes fonts de dades semànticament riques esmorteeixen el fet de no tenir clars els requeriments d'usuari d'avantmà.Cal notar que els nostres mètodes estableixen un marc de treball combinat que es pot emprar per decidir, donat un escenari concret, quin enfocament és més adient. Per exemple, no es pot seguir el mateix enfocament en un escenari on els requeriments són ben coneguts d'avantmà i en un escenari on aquestos encara no estan clars (un cas recorrent d'aquesta situació és quan l'usuari no té clares les capacitats d'anàlisi del seu propi sistema). De fet, disposar d'uns bons requeriments d'avantmà esmorteeix la necessitat de disposar de fonts de dades semànticament riques, mentre que a l'inversa, si disposem de fonts de dades que capturen adequadament el nostre domini de treball, els requeriments no són necessaris d'avantmà. Per aquests motius, en aquesta tesi aportem un marc de treball combinat que cobreix tots els possibles escenaris que podem trobar durant la tasca de modelatge del magatzem de dades.

    Previous experiences in the data warehouse field have shown that the data warehouse multidimensional conceptual schema must be derived from a hybrid approach: i.e., by considering both the end-user requirements and the data sources, as first-class citizens. Like in any other system, requirements guarantee that the system devised meets the end-user necessities. In addition, since the data warehouse design task is a reengineering process, it must consider the underlying data sources of the organization: (i) to guarantee that the data warehouse must be populated from data available within the organization, and (ii) to allow the end-user discover unknown additional analysis capabilities.Currently, several methods for supporting the data warehouse modeling task have been provided. However, they suffer from some significant drawbacks. In short, requirement-driven approaches assume that requirements are exhaustive (and therefore, do not consider the data sources to contain alternative interesting evidences of analysis), whereas data-driven approaches (i.e., those leading the design task from a thorough analysis of the data sources) rely on discovering as much multidimensional knowledge as possible from the data sources. As a consequence, data-driven approaches generate too many results, which mislead the user. Furthermore, the design task automation is essential in this scenario, as it removes the dependency on an expert's ability to properly apply the method chosen, and the need to analyze the data sources, which is a tedious and timeconsuming task (which can be unfeasible when working with large databases). In this sense, current automatable methods follow a data-driven approach, whereas current requirement-driven approaches overlook the process automation, since they tend to work with requirements at a high level of abstraction. Indeed, this scenario is repeated regarding data-driven and requirement-driven stages within current hybrid approaches, which suffer from the same drawbacks than pure data-driven or requirement-driven approaches.In this thesis we introduce two different approaches for automating the multidimensional design of the data warehouse: MDBE (Multidimensional Design Based on Examples) and AMDO (Automating the Multidimensional Design from Ontologies). Both approaches were devised to overcome the limitations from which current approaches suffer. Importantly, our approaches consider opposite initial assumptions, but both consider the end-user requirements and the data sources as first-class citizens.1. MDBE follows a classical approach, in which the end-user requirements are well-known beforehand. This approach benefits from the knowledge captured in the data sources, but guides the design task according to requirements and consequently, it is able to work and handle semantically poorer data sources. In other words, providing high-quality end-user requirements, we can guide the process from the knowledge they contain, and overcome the fact of disposing of bad quality (from a semantical point of view) data sources.2. AMDO, as counterpart, assumes a scenario in which the data sources available are semantically richer. Thus, the approach proposed is guided by a thorough analysis of the data sources, which is properly adapted to shape the output result according to the end-user requirements. In this context, disposing of high-quality data sources, we can overcome the fact of lacking of expressive end-user requirements.Importantly, our methods establish a combined and comprehensive framework that can be used to decide, according to the inputs provided in each scenario, which is the best approach to follow. For example, we cannot follow the same approach in a scenario where the end-user requirements are clear and well-known, and in a scenario in which the end-user requirements are not evident or cannot be easily elicited (e.g., this may happen when the users are not aware of the analysis capabilities of their own sources). Interestingly, the need to dispose of requirements beforehand is smoothed by the fact of having semantically rich data sources. In lack of that, requirements gain relevance to extract the multidimensional knowledge from the sources.So that, we claim to provide two approaches whose combination turns up to be exhaustive with regard to the scenarios discussed in the literature

  • Utilización de glosarios de Moodle para incentivar la participación y dedicación de los estudiantes

     Abello Gamazo, Alberto; Burgues Illa, Xavier; Rodríguez, M. Elena
    Jornadas de Enseñanza Universitaria de la Informática
    Presentation's date: 2010-07-01
    Presentation of work at congresses

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    Adaptació d'assignatures de bases de dades a l'EEES  Open access

     Martin Escofet, Carme; Abello Gamazo, Alberto; Burgues Illa, Xavier; Casañ Guerrero, Maria Jose; Quer, Carme; Rodriguez Gonzalez, M. Elena; Urpi Tubella, Antoni
    Congrés Internacional de Docència Universitària i Innovació
    Presentation's date: 2010-07-01
    Presentation of work at congresses

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    Els canvis recents en els plans d'estudis de la UPC i la UOC tenen en compte el nou espai europeu d'educació superior (EEES). Una de les conseqüències directes d'aquests canvis és la necessitat d'afitar i optimitzar el temps dedicat a les activitats d'aprenentatge que requereixen la participació activa de l'estudiant i que es realitzen de manera continuada durant el semestre. A més, l'EEES destaca la importància de les pràctiques, les relacions interpersonals i la capacitat de treballar en equip, suggerint la reducció de classes magistrals i l'augment d'activitats que fomentin tant el treball personal de l'estudiant com el cooperatiu. En l'àmbit de la docència informàtica d'assignatures de bases de dades el problema és especialment complex degut a que els enunciats de les proves no acostumen a tenir una solució única. Nosaltres hem desenvolupat una eina, anomenada LEARN-SQL, l'objectiu de la qual és corregir automàticament qualsevol tipus de sentència SQL (consultes, actualitzacions, procediments emmagatzemats, disparadors, etc ...) i discernir si la resposta aportada per l'estudiant és o no és correcta amb independència de la solució concreta que aquest proposi. D'aquesta manera potenciem l'autoaprenentatge i l'autoavaluació, fent possible la semipresencialitat supervisada i facilitant l'aprenentatge individualitzat segons les necessitats de cada estudiant. Addicionalment, aquesta eina ajuda als professors a dissenyar les proves d'avaluació, permetent també la opció de revisar qualitativament les solucions aportades pels estudiants. Per últim, el sistema proporciona ajuda als estudiants per a que aprenguin dels seus propis errors, proporcionant retroalimentació de qualitat. En aquest article presentem una proposta d’adaptació per les assignatures de bases de dades a l’EEES amb l’ús de LEARN-SQL a les sessions de laboratori i d’algunes tècniques d’aprenentatge cooperatiu a les sessions de problemes.

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    Adapting LEARN-SQL to database computer supported cooperative learning  Open access

     Burgues Illa, Xavier; Martin Escofet, Carme; Quer, Carme; Abello Gamazo, Alberto; Casañ Guerrero, Maria Jose; Urpi Tubella, Antoni; Rodríguez, M. Elena
    Workshop on Methods and Cases in Computing Education
    Presentation's date: 2010-06-30
    Presentation of work at congresses

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    LEARN-SQL is a tool that we are using since three years ago in several database courses, and that has shown its positive effects in the learning of different database issues. This tool allows proposing remote questionnaires to students, which are automatically corrected giving them a feed-back and promoting their self-learning and self-assessment of their work. However, this tool as it is currently used does not has the possibility to propose structured exercises to teams that promote their cooperative learning. In this paper, we present our adaptation of the LEARN-SQL tool for allowing some Computer-Supported Collaboration Learning techniques.

  • A survey of multidimensional modeling methodologies

     Romero Moral, Oscar; Abello Gamazo, Alberto
    International journal of data warehousing and mining
    Date of publication: 2009-04
    Journal article

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  • On-Line Analytical Processing (OLAP)

     Abello Gamazo, Alberto; Romero Moral, Oscar
    Date of publication: 2009
    Book chapter

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  • PLATAFORMA DE INTEROPERABILIDAD PARA LABORATORIOS UNIVERSITARIOS

     Abello Gamazo, Alberto; Bragos Bardia, Ramon; Cabrera Bean, Margarita Asuncion; Fernández Ruzafa, Jose
    Participation in a competitive project

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  • Red nacional de gestión de datos

     Vela Sánchez, Belén; Teniente Lopez, Ernest; Abello Gamazo, Alberto; Urpi Tubella, Antoni; Farré Tost, Carles; Romero Moral, Oscar
    Participation in a competitive project

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  • Discovering meaningful keys from ontologies

     Romero Moral, Oscar; Abello Gamazo, Alberto; Montesó, Joan Marc
    Date: 2009
    Report

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  • Automatic multidimensional design of data warehouses from requirements

     Romero Moral, Oscar; Abello Gamazo, Alberto
    Date: 2009
    Report

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  • METODOS Y HERRAMIENTAS PARA LA VALIDACION Y LA GENERACION DE MAPPINGS ENTRE ESQUEMAS DE DATOS

     Queralt Calafat, Anna; Rull Fort, Guillem; Urpi Tubella, Antoni; Abello Gamazo, Alberto; Farré Tost, Carles; Romero Moral, Oscar; Teniente Lopez, Ernest
    Participation in a competitive project

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  • LEARN-SQL: Herramienta de gestión de ejercicios de SQL con autocorrección  Open access

     Abello Gamazo, Alberto; Burgues Illa, Xavier; Casañ Guerrero, Maria Jose; Martin Escofet, Carme; Quer, Carme; Urpi Tubella, Antoni; Rodriguez Gonzalez, M. Elena
    Jornadas de Enseñanza Universitaria de la Informática
    Presentation's date: 2009-07-09
    Presentation of work at congresses

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    Algunas herramientas de autocorrección existen ya en el ámbito de la docencia informática. No obstante en asignaturas de bases de datos el problema es especialmente complejo debido a la gran variedad de tipos de ejercicios (los sistemas existentes se limitan a consultas) y a que éstos no tienen solución única. Nuestro sistema tiene como objetivo corregir automáticamente cualquier tipo de sentencia SQL (consultas, actualizaciones, procedimientos, disparadores, creación de índices, etc.) y discernir si la respuesta aportada por el estudiante es o no correcta con independencia de la solución concreta que éste proponga. En esta comunicación presentaremos específicamente el módulo encargado de la gestión de ejercicios y todas las tipologías de estos que estamos utilizando en la actualidad.

  • Discovering functional dependencies from ontologies

     Romero Moral, Oscar; Calvanese, Diego; Abello Gamazo, Alberto; Rodríguez Muro, Mariano
    International Workshop On Data Warehousing and OLAP
    Presentation's date: 2009-11-06
    Presentation of work at congresses

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    Nowadays, it is widely accepted that the data warehouse design task should be largely automated. Furthermore, the data warehouse conceptual schema must be structured according to the multidimensional model and as a consequence, the most common way to automatically look for subjects and dimensions of analysis is by discovering functional dependencies (as dimensions functionally depend on the fact) over the data sources. Most advanced methods for automating the design of the data warehouse carry out this process from relational OLTP systems, assuming that a RDBMS is the most common kind of data source we may find, and taking as starting point a relational schema. In contrast, in our approach we propose to rely instead on a conceptual representation of the domain of interest formalized through a domain ontology expressed in the DL-Lite Description Logic. We propose an algorithm to discover functional dependencies from the domain ontology that exploits the inference capabilities of DL-Lite, thus fully taking into account the semantics of the domain. We also provide an evaluation of our approach in a real-world scenario.

  • Qualidade em sites na área da saúde (SALUS)

     Abello Gamazo, Alberto; Palazzo, José; Farré Tost, Carles; Romero Moral, Oscar; García, Roberto; Oliva, Marta
    Participation in a competitive project

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    LEARN-SQL: automatic assesment of SQL Based on IMS QTI specification  Open access

     Abello Gamazo, Alberto; Rodriguez Gonzalez, M. Elena; Urpi Tubella, Antoni; Burgues Illa, Xavier; Casañ Guerrero, Maria Jose; Martin Escofet, Carme; Quer, Carme
    IEEE International Conference on Advanced Learning Technologies
    Presentation's date: 2008-07-01
    Presentation of work at congresses

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    In this paper we present LEARN-SQL, a system conforming to the IMS QTI specification that allows on-line learning and assessment of students on SQL skills in an automatic, interactive, informative, scalable and extensible manner.

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    Uso de LEARN-SQL en el aprendizaje cooperativo de bases de datos  Open access

     Burgues Illa, Xavier; Quer, Carme; Abello Gamazo, Alberto; Casañ Guerrero, Maria Jose; Martin Escofet, Carme; Rodriguez Gonzalez, M. Elena; Urpi Tubella, Antoni
    Jornadas de Enseñanza Universitaria de la Informática
    Presentation's date: 2008-07-09
    Presentation of work at congresses

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    En este artículo se describen los cambios efectuados en algunas asignaturas del área de bases de datos en dos vertientes: organizativa y tecnológica. En la primera, el objetivo principal ha sido la introducción de técnicas de aprendizaje cooperativo. En la segunda, el objetivo ha sido potenciar el autoaprendizaje y el autoevaluación a través de la herramienta LEARN-SQL. Los cambios relacionados con las dos vertientes se han aplicado, hasta el momento, a asignaturas distintas. Para finalizar el artículo, se hace una valoración de los resultados obtenidos, y se trazan las líneas de futuros cambios orientados a la combinación de las dos vertientes.

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    LEARN-SQL: a blended learning tool for the database area  Open access

     Casañ Guerrero, Maria Jose; Martin Escofet, Carme; Abello Gamazo, Alberto; Burgues Illa, Xavier; Quer, Carme; Rodriguez Gonzalez, M. Elena; Urpi Tubella, Antoni
    Congrés Internacional de Docència Universitària i Innovació
    Presentation's date: 2008-07-03
    Presentation of work at congresses

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    Los cambios recientes en los planes de estudio de la UPC y la UOC tienen en cuenta el nuevo espacio europeo de educación superior (EEES). Una de las consecuencias directas de estos cambios es la necesidad de acotar y optimizar el tiempo a dedicar a las actividades de aprendizaje que requieren la participación activa del estudiante y que se realizan de forma continuada durante el semestre. En el ámbito de la docencia informática de asignaturas de bases de datos el problema es especialmente complejo debido a que los enunciados de las pruebas no acostumbran a tener una solución única. Nosotros hemos desarrollado una herramienta, llamada LEARN-SQL, cuyo objetivo es corregir automáticamente cualquier tipo de sentencia SQL (consultas, actualizaciones, procedimientos almacenados, disparadores etc.) y discernir si la respuesta aportada por el estudiante es o no correcta con independencia de la solución concreta que este proponga. Además esta herramienta ayuda a los profesores a diseñar las pruebas de evaluación, permitiendo también la opción de revisar cualitativamente las soluciones aportadas por los estudiantes. Por último, el sistema proporciona ayuda a los estudiantes para que aprendan de sus propios errores, proporcionando feedback de calidad.

  • MDBE: Automatic Multidimensional Modeling

     Romero Moral, Oscar; Abello Gamazo, Alberto
    Lecture notes in computer science
    Date of publication: 2008-10
    Journal article

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  • MDBE: Automatic Multidimensional Design

     Romero Moral, Oscar; Abello Gamazo, Alberto
    International Conference on Conceptual Modeling
    Presentation's date: 2008-10-21
    Presentation of work at congresses

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    The goal of this demonstration is to present MDBE, a tool implementing our methodology for automatically deriving multidimensional schemas from relational sources, bearing in mind the end-user requirements. Our approach starts gathering the end-user information requirements that will be mapped over the data sources as SQL queries. Based on the constraints that a query must preserve to make multidimensional sense, MDBE automatically derives multidimensional schemas which agree with both the input requirements and the data sources.

  • Database Design and Administration

     Abello Gamazo, Alberto; Rollon Rico, Emma; Rodriguez Gonzalez, M. Elena
    Date of publication: 2007-09
    Book

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  • Automating Multidimensional Design from Ontologies

     Romero Moral, Oscar; Abello Gamazo, Alberto
    International Workshop On Data Warehousing and OLAP
    Presentation's date: 2007-11-09
    Presentation of work at congresses

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  • MDBE: Una Herramienta Automática para el Modelado Multidimensional

     Romero Moral, Oscar; Abello Gamazo, Alberto
    XII Jornadas de Ingeniería del Software y Bases de Datos (JISBD 2007)
    Presentation's date: 2007-09-12
    Presentation of work at congresses

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  • Extensión de Moodle para facilitar la corrección automática de cuestionarios y su aplicación en el ámbito de las bases de datos

     Abello Gamazo, Alberto; Urpi Tubella, Antoni; Rodriguez Gonzalez, M. Elena; Estèvez, Marc
    MoodleMoot 2007
    Presentation's date: 2007-10-15
    Presentation of work at congresses

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