Pablo Castells

Ontology-based Personalised and Context-aware Recommendations of News Items (2009)

Semantic search has been one of the major envisioned benefits of the Semantic Web since its emergence in the late 90’s [1]. Our demo shows a proposal towards this goal. One way to view a semantic...

Iván Cantador, Ro Bellogín, Pablo Castells

1 Personalized Content Retrieval in Context Using Ontological Knowledge (2009)

David Vallet, Pablo Castells, Miriam Fernández, Phivos Mylonas, Yannis Avrithis

Abstract — Personalized content retrieval aims at improving the retrieval process by taking into account the particular interests of individual users. However, not all user preferences are relevant...

Discovering Relevant Preferences in a Personalised Recommender System using Machine Learning Techniques (2009)

Ro Bellogín, Iván Cantador, Pablo Castells, Álvaro Ortigosa, Escuela Politécnica

Abstract. Personalised recommender systems learn about a user’s needs, and identify and suggest information items (news articles, images, videos, etc.) that meet those needs. User needs can be...

M.: A rote extractor with edit distance-based generalisation and multi-corpora precision calculation. In (2009)

Enrique Alfonseca, Pablo Castells, Manabu Okumura, Maria Ruiz-casado, Computer Science Deptartment

In this paper, we describe a rote extractor that learns patterns for finding semantic relationships in unrestricted text, with new procedures for pattern generalization and scoring. These include the...

Semantic-based Taxonomic Categorization of Web Services (2009)

Enriching Ontological User Profiles with Tagging History for Multi-Domain Recommendations (2009)

Abstract. With the envisioned proliferation of Web services available on the WWW and private repositories, new and better support techniques are needed for service discovery and organization to stay...

Iván Cantador, Martin Szomszor, Harith Alani, Miriam Fernández, Pablo Castells

{mns2, ha} @ ecs.soton.ac.uk Abstract. Many advanced recommendation frameworks employ ontologies of various complexities to model individuals and items, providing a mechanism for the expression of...

Semantic Search meets the Web (2009)

Miriam Fern, Vanessa Lopez, Marta Sabou, Victoria Uren, David Vallet, Enrico Motta, ...

While semantic search technologies have been proven to work well in specific domains, they still have to confront two main challenges to scale up to the Web in its entirety. In this work we address...

Using Domain Models for Data Characterization in PBE (2008)

Enriching Ontological User Profiles with Tagging History for Multi-Domain Recommendations (2008)

One of the main problems in PBE inferencing is that of deriving abstract data characterizations from concrete objects and values involved in user’s manipulations [8]. This involves selecting...

ontological (2008)

David Vallet, Miriam Fern, Pablo Castells, Phivos Mylonas, Yannis Avrithis

contextual personalization approach based on

Cantador, Iván, Szomszor, Martin, Alani, Harith, Fernández, Miriam, Castells, Pablo

Many advanced recommendation frameworks employ ontologies of various complexities to model individuals and items, providing a mechanism for the expression of user interests and the representation of...

Enriching Ontological User Profiles with Tagging History for Multi-Domain Recommendations (2008)

Cantador, Iván, Szomszor, Martin, Alani, Harith, Fernández, Miriam, Castells, Pablo

Many advanced recommendation frameworks employ ontologies of various complexities to model individuals and items, providing a mechanism for the expression of user interests and the representation of...

Building Emergent Social Networks by Semantic User Preference Clustering (2008)

Semantic Monitoring Techniques for EUD (2008)

Abstract. This paper presents a novel approach to automatic semantic social network construction based on semantic user preference clustering. Considering a number of users, each of them with an...

Personalized Information Retrieval in Context (2008)

In this work, we present how domain modeling and Programming by Example techniques can be combined to carry through a EUD approach. Our techniques are based on detecting iteration patterns from user...

David Vallet, Miriam Fernández, Pablo Castells, Phivos Mylonas, Yannis Avrithis

Personalized content retrieval aims at improving the retrieval process by taking into account the particular interests of individual users. However, not all user preferences are relevant in all...

Finding Iteration Patterns in Dynamic Web Page Authoring (2008)

P.: DESK-H: building meaningful histories in an editor of dynamic web pages (2008)

Abstract. Most of the current WWW is made up of dynamic pages. The development of dynamic pages is a difficult and costly endeavour, out-of-reach for most users, experts, and content producers. We...

The Quest for Information Retrieval on the Semantic Web (2008)

DESK is a WYSIWYG editor for dynamic web pages that are generated from an explicit ontology-based domain model [3]. DESK provides a significant scope of customization functionalities for dynamic...

David Vallet, Miriam Fernández, Pablo Castells

Abstract. Semantic search has been one of the motivations of the Semantic Web since it was envisioned. We propose a model for the exploitation of ontology-based KBs to improve search over large...

SEMI-AUTOMATIC WEB SERVICE GENERATION AND CLASSIFICATION Automated assistance to the web service life cycle (2008)

Miguel Angel Corella, José María Fuentes, Pablo Castells

Abstract: The convergence of semantic web techniques with web service technologies has enabled the emergence of so-called semantic web services. This new kind of services enacts the automatic...

Documents (2008)

Chapter 1 SEMANTIC WEB TECHNOLOGIES FOR THE FINANCIAL DOMAIN (2008)

Semantic search has been one of the major envisioned benefits of the Semantic Web since its emergence in the late 90’s [1]. Our demo shows a proposal towards this goal. One way to view a semantic...

Rubén Lara, Iván Cantador, Pablo Castells

Abstract: Data, information and knowledge management are key activities in modern economies, and considerable efforts and resources are devoted to them by organisations world-wide. An optimal...

TKDE-0456-1005 1 An Adaptation of the Vector-Space Model for Ontology-Based Information Retrieval (2008)

Pablo Castells, Miriam Fernández, David Vallet

Abstract--Semantic search has been one of the motivations of the Semantic Web since it was envisioned. We propose a model for the exploitation of ontology-based knowledge bases to improve search over...

Taxonomy-Based Web Service Categorization Using Conceptual Parameter Descriptions (2008)

Finding Iteration Patterns in Dynamic Web Page Authoring (2008)

Abstract. With the envisioned proliferation of Web services available on the WWW and private repositories, new and better support techniques are needed for service discovery and organization to stay...

2 (2008)

Javier Tejedor, Roberto García, Miriam Fernández, Ferrán Perdrix, José A. Macías, ...

As part of the general growth and diversification of media in different modalities, the presence of information in the form of human speech in the world-wide body of digital content is becoming...

Using Historical Data to Enhance Rank Aggregation (2008)

Abstract. Most of the current WWW is made up of dynamic pages. The development of dynamic pages is a difficult and costly endeavour, out-of-reach for most users, experts, and content producers. We...

Iván Cantador, Miriam Fernández, Pablo Castells, Escuela Politécnica

Rank aggregation is a pervading operation in IR technology. We hypothesize that the performance of score-based aggregation may be affected by artificial, usually meaningless deviations consistently...

General Terms (2008)

In this work, we present an extension of CORE [2], a tool for Collaborative Ontology Reuse and Evaluation. The system receives an informal description of a specific semantic domain and determines...

Extracting Multilayered Semantic Communities of Interest Abstract from Ontology-based User Profiles: Application to Group Modelling and Hybrid Recommendations (2008)

Iván Cantador, Pablo Castells, Escuela Politécnica Superior

A Community of Interest is a specific type of Community of Practice. It is formed by a group of individuals who share a common interest or passion. These people exchange ideas and thoughts about the...

ontology (2008)

María Ruiz-casado, Enrique Alfonseca, Pablo Castells

context-window overlapping in synonym discovery and

General Terms (2008)

Iván Cantador, Miriam Fernández, Pablo Castells, Escuela Politécnica

In this work, we present an extension of CORE [8], a tool for Collaborative Ontology Reuse and Evaluation. The system receives an informal description of a specific semantic domain and determines...

General Terms (2008)

Miriam Fernández, Iván Cantador, Pablo Castells, Escuela Politécnica

Ontology evaluation can be defined as assessing the quality and the adequacy of an ontology for being used in a specific context, for a specific goal. In this work, a tool for Collaborative Ontology...

An EUD Approach for Making MBUI Practical (2008)

A Generic Presentation Modeling System for Adaptive Web-based Instructional Applications (2008)

In this paper, we present our perspective on Model-Based User Interfaces (hereafter MBUI) paradigm and provide with our experience in this area combining high-level knowledge-based data models (i.e....

Organization Workshop Organizers (2008)

We propose a generic presentation system for adaptive educational hypermedia that is highly independent from domain knowledge representation and application state management. Generality is achieved...

Stephan Bloehdorn, Marko Grobelnik, Peter Mika, Thanh Tran Duc, Bettina Berendt, Paul Buitelaar, ...

International Workshop located at the

A Multilayer Ontology-based Hybrid Recommendation Model (2008)

Iván Cantador, Ro Bellogín, Pablo Castells, Escuela Politécnica

We propose a novel hybrid recommendation model in which user preferences and item features are described in terms of semantic concepts defined in domain ontologies. The exploitation of...

News@hand: A semantic web approach to recommending news (2008)

Iván Cantador, Ro Bellogín, Pablo Castells

Abstract. We present

Extracting Multilayered Semantic Communities of Interest from Ontology-based User Profiles: Application to Group Modelling and Hybrid Recommendations (2008)

Iván Cantador, Pablo Castells, Escuela Politécnica Superior

A Community of Interest is a specific type of Community of Practice. It is formed by a group of individuals who share a common interest or passion. These people exchange ideas and thoughts about the...

A Multilayer Ontology-based Hybrid Recommendation Model (2008)

Iván Cantador, Ro Bellogín, Pablo Castells, Escuela Politécnica

We propose a novel hybrid recommendation model in which user preferences and item features are described in terms of semantic concepts defined in domain ontologies. The exploitation of...

Context-Sensitive User Interface Support for OntologyBased Web Applications (2007)

Pablo Castells, Jos A. Macas

The Semantic Web introduces new needs and possibilities for the development of Graphical User Interfaces (GUI's). Interacting with end-users on the Web means getting user

Building Dynamic Interface Presentations by Example (2007)

Pablo Castells

Current and foreseeable trends in computer technology usage call for increasingly flexible and sophisticated interactive software, yet the development of graphical user interfaces (GUIs) remains a...

e-Portfolio: Java Technology for Financial Applications on the Internet (2007)

Alberto Suárez, Pablo Castells

Using Domain Models for Data Characterization in PBE (2007)

E.T.S.I. Informatica (2007)

One of the main problems in PBE inferencing is that of deriving abstract data characterizations from concrete objects and values involved in user’s manipulations [8]. This involves selecting...

Pablo Castells, Pedro Szekely

Abstract Interface builders and multi-media authoring tools only support the construction of static displays where the components of the display are known at design time (e.g., buttons, menus)....

Modelling Ontology-based Multilayered Communities of Interest for Hybrid Recommendations (2007)

Iván Cantador, Pablo Castells, Ro Bellogín

Abstract. This paper describes a strategy that automatically identifies Communities of Interest (CoI) from the tastes and preferences expressed by users in personal ontology-based profiles, and...

Automatising the Learning of Lexical Patterns: an Application to the Enrichment of WordNet by Extracting Semantic Relationships from Wikipedia (2007)

Maria Ruiz-casado, Enrique Alfonseca, Pablo Castells

This paper describes an automatic approach to identify lexical patterns that represent semantic relationships between concepts in an on-line encyclopedia. Next, these patterns can be applied to...

A flexible model for the location of services (2007)

Ruben Lara, Miguel Corella, Pablo Castells

The advent of the SOA paradigm is expected to cause an increase in the number of available services. This increase can create a bottleneck for the location and, therefore, for the use of services...

A Flexible Model for the Semi-automatic Location of Services (2007)

Rubén Lara Hernández, Pablo Castells, Azpilicueta Rubén, Lara Hernández

SOA is attracting increasing attention as an architectural paradigm which can enable a higher reuse of IT assets, their principled and eased integration into more complex services and, therefore, a...

Enriching Group Profiles with Ontologies for Knowledge-Driven Collaborative Content Retrieval (2006)

Iván Cantador, Pablo Castells, David Vallet, Escuela Politécnica

This paper proposes several strategies for the combination of ontology-based user profiles to generate a shared semantic profile for a group of users. The performance of the strategies is...

Castells: An Ontology-Based Approach to the Description and Execution of Composite Network Management Processes for Network Monitoring (2006)

José María Fuentes, Pablo Castells

Abstract. Web service technology has been proposed to implement management interfaces of managed resources. These web services can usually be combined to perform composite processes. These composite...

From Wikipedia to Semantic Relationships: a Semi-automated Annotation Approach (2006)

Maria Ruiz-casado, Enrique Alfonseca, Pablo Castells

Abstract. In this paper, an experiment is presented for the automatic annotation of several semantic relationships in the Wikipedia, a collaborative on-line encyclopedia. The procedure is based on a...

Castells: An Ontology-Based Approach to the Description and Execution of Composite Network Management Processes for Network Monitoring (2006)

José María Fuentes, Pablo Castells

Abstract. Web service technology has been proposed to implement management interfaces of managed resources. These web services can usually be combined to perform composite processes. These composite...

XBRL Taxonomies and OWL Ontologies for Investment Funds (2006)

Rubén Lara, Iván Cantador, Pablo Castells

Abstract. The analysis of investment funds information requires the availability of homogeneous, both up-to-date and historical information of the funds considered, which is usually generated and...

Building Emergent Social Networks and Group Profiles by Semantic User Preference Clustering (2006)

A Multi-Purpose Ontology-Based Approach for Personalized Content Filtering and Retrieval (2006)

Abstract. This paper presents a novel approach to automatic semantic social network construction based on semantic user preference clustering. Considering a number of users, each of them with an...

David Vallet, Iván Cantador, Miriam Fernández, Pablo Castells, Escuela Politécnica Superior

Personalized multimedia access aims at enhancing the retrieval process by complementing explicit user requests with implicit user preferences. We propose and discuss the benefits of the introduction...

Multilayered Ontology-Based User Profiles and Semantic Social Networks for Recommender Systems (2006)

A Flexible Model for Web Service Discovery (2006)

Abstract. This paper describes a strategy that automatically clusters ontologybased user profiles taking into account their common interests for domain concepts. The obtained semantic clusters are...

Rubén Lara, Miguel Ángel Corella, Pablo Castells

Abstract. The advent of the SOA paradigm is expected to cause an increase in the number of available Web services. In this setting, advanced facilities for the discovery of Web services that provide...

A Multi-Purpose Ontology-Based Approach for Personalized Content Filtering and Retrieval (2006)

Iván Cantador, Miriam Fernández, David Vallet, Pablo Castells, Jérôme Picault, Myriam Ribière

Abstract. Personalised multimedia access aims at enhancing the retrieval process by complementing explicit user requests with implicit user preferences. We propose and discuss the benefits of the...

Probabilistic Score Normalization for Rank Aggregation (2006)

From Wikipedia to Semantic Relationships: a Semi-automated Annotation Approach (2006)

Abstract. Rank aggregation is a pervading operation in IR technology. We hypothesize that the performance of score-based aggregation may be affected by artificial, usually meaningless deviations...

Maria Ruiz-casado, Enrique Alfonseca, Pablo Castells

Abstract. In this paper, an experiment is presented for the automatic annotation of several semantic relationships in the Wikipedia, a collaborative on-line encyclopedia. The procedure is based on a...

Probabilistic Score Normalization for Rank Aggregation (2006)

Multilayered Semantic Social Network Modelling by Ontology-Based User Profiles Clustering: Application to Collaborative Filtering (2006)

Abstract. Rank aggregation is a pervading operation in IR technology. We hypothesize that the performance of score-based aggregation may be affected by artificial, usually meaningless deviations...

Multilayered Ontology-Based User Profiles and Semantic Social Networks for Recommender Systems (2006)

Abstract. We propose a multilayered semantic social network model that offers different views of common interests underlying a community of people. The applicability of the proposed model to a...

P.: Semi-automatic semantic-based web service classification (2006)

Abstract. This paper describes a strategy that automatically clusters ontologybased user profiles taking into account their common interests for domain concepts. The obtained semantic clusters are...

P.: A Heuristic Approach to Semantic Web Services Classification (2006)

Abstract. With the expectable growth of the number of Web services available on the WWW and service repositories, the need for mechanisms that enable the automatic organization and discovery of...

Personalized Information Retrieval in Context (2006)

Abstract. Web service technologies, and the vision of semantically-enhanced services, aim to be key enablers to further exploit the potential of the Web as a platform where units of functionality can...

David Vallet, Miriam Fernández, Pablo Castells, Phivos Mylonas, Yannis Avrithis

Personalized content retrieval aims at improving the retrieval process by taking into account the particular interests of individual users. However, not all user preferences are relevant in all...

Y.: Self-Tuning Personalized Information Retrieval in an Ontology-Based Framework (2005)

Pablo Castells, Miriam Fernández, David Vallet, Phivos Mylonas, Yannis Avrithis

Abstract. Reliability is a well-known concern in the field of personalization technologies. We propose the extension of an ontology-based retrieval system with semantic-based personalization...

An ontology-based information retrieval model (2005)

David Vallet, Miriam Fernández, Pablo Castells

Abstract. Semantic search has been one of the motivations of the Semantic Web since it was envisioned. We propose a model for the exploitation of ontologybased KBs to improve search over large...

Y.: A Semantically-Enhanced Personalization Framework for Knowledge-Driven Media Services (2005)

David Vallet, Phivos Mylonas, Miguel A. Corella, José M. Fuentes, Pablo Castells, Yannis Avrithis

This paper describes a comprehensive framework giving support to a wide range of personalization facilities in a multimedia content management environment. The framework builds upon a rich,...

Automatic extraction of semantic relationships for wordnet by means of pattern learning from wikipedia (2005)

Maria Ruiz-casado, Enrique Alfonseca, Pablo Castells

Abstract. This paper describes an automatic approach to identify lexical patterns which represent semantic relationships between concepts, from an on-line encyclopedia. Next, these patterns can be...

Automatic Assignment of Wikipedia Encyclopedic Entries to WordNet Synsets (2005)

Maria Ruiz-casado, Enrique Alfonseca, Pablo Castells

Abstract. We describe an approach taken for automatically associating entries from an on-line encyclopedia with concepts in an ontology or a lexical semantic network. It has been tested with the...

Y.: Self-Tuning Personalized Information Retrieval in an Ontology-Based Framework (2005)

Pablo Castells, Miriam Fernández, David Vallet, Phivos Mylonas, Yannis Avrithis

Abstract. Reliability is a well-known concern in the field of personalization technologies. We propose the extension of an ontology-based retrieval system with semantic-based personalization...

Semantic web technologies for economic and financial information management (2004)

Pablo Castells, Borja Foncillas, Rubén Lara, Mariano Rico, Juan Luis Alonso, Información Y Finanzas

Abstract. The field of economy and finance is a conceptually rich domain where information is complex, huge in volume and a highly valuable business product by itself. Novel management techniques are...

Semantic web technologies for economic and financial information management (2004)

Pablo Castells, Borja Foncillas, Rubén Lara, Mariano Rico, Juan Luis Alonso, Información Y Finanzas

Abstract. The field of economy and finance is a conceptually rich domain where information is complex, huge in volume and a highly valuable business product by itself. Novel management techniques are...

Dynamic Web Page Authoring by Example Using Ontology-Based Domain Knowledge (2003)

José A. Macías, Pablo Castells, Escuela Politécnica Superior

Authoring dynamic web pages is an inherently difficult task. We present DESK, an interactive authoring tool that allows the customization of dynamic page generation procedures with no apriori...

Un sistema de presentación dinámica hipermedia para representaciones (2002)

Castells, Pablo, Macías, José Antonio

Los sistemas web adaptativos presentan información al usuario en documentos hipermedia generados dinámicamente de acuerdo con un modelo automáticamente actualizado del usuario. Por lo general los...

Un sistema de presentación dinámica hipermedia para representaciones (2002)

Castells, Pablo, Macías, José Antonio

Los sistemas web adaptativos presentan información al usuario en documentos hipermedia generados dinámicamente de acuerdo con un modelo automáticamente actualizado del usuario. Por lo general los...

Tailoring Dynamic Ontology-Driven Web Documents by Demonstration (2002)

An Adaptive Hypermedia Presentation Modeling System for Custom Knowledge Representations (2001)

In this paper we present DESK, an authoring tool for the automatic customisation of the front-end of web applications as a result of changes that users perform in dynamically generated HTML pages....

Pablo Castells, José Antonio Macías

Abstract. We propose a generic presentation system for adaptive educational hypermedia that is highly independent from domain knowledge representation and application state management. Our approach...

Adaptive Hypermedia Presentation Modeling for Domain Ontologies (2001)

José Antonio Macías, Pablo Castells

Adaptive hypermedia has become a hot topic as web-based on-line instruction keeps thriving. We propose a framework that supports the definition of dynamic hypermedia presentations without assuming a...

An Authoring Tool for Building Adaptive Learning Guidance Systems on the Web (2001)