Daniel Olmedilla

Semantic Web Challenge Chairs (2009)

Tim Finin, Lalana Kagal, Daniel Olmedilla, Iswc Sponsor, Gold Sponsor, Silver Sponsor, ...

We would like to express our special thanks to all sponsorsISWC 2007 Organizing Committee

Towards Reactive Semantic Web Policies: Advanced Agent Control for the Semantic Web (2009)

José Júlio Alferes, Ricardo Amador, Daniel Olmedilla

The Semantic Web envisions a distributed environment with well-defined data that can be understood and used by machines. This machine-understandable knowledge allows intelligent agents to...

Using Natural Language Policies for Privacy Control in Social Platforms (2009)

De Coi, Juri, Kärger, Philipp, Olmedilla, Daniel, Zerr, Sergej

De Coi, J. L., Kärger, P., Olmedilla, D., & Zerr, S. (2009). Using Natural Language Policies for Privacy Control in Social Platforms. In M. Hausenblas, P. Kärger, D. Olmedilla, A. Passant & A....

Zerber+R: Top-k Retrieval from a Confidential Index (2009)

Zerr, Sergej, Olmedilla, Daniel, Nejdl, Wolfgang, Siberski, Wolf

Zerr, S., Olmedilla, D., Nejdl, W., & Siberski, W. (2009). Zerber+R: Top-k Retrieval from a Confidential Index. Proceedings of the 12th International Conference on Extending Database Technology:...

What do you prefer? Using Preferences to Enhance Learning Technology (2008)

Kärger, Philipp, Olmedilla, Daniel, Abel, Fabian, Herder, Eelco, Siberski, Wolf

Kärger, P., Olmedilla, D., Abel, F., Herder, E., & Siberski, W. (2008). What do you prefer? Using Preferences to Enhance Learning Technology. IEEE Journal for Transactions on Learning Technologies,...

Social Software for Lifelong Competence Development: Challenges and Infrastructure (2008)

Ivana Marenzi; L3S Research Center, Elena Demidova; L3S Research Center, Wolfgang Nejdl; L3S Research Center, Daniel Olmedilla; L3S Research Center, Sergej Zerr; L3S Research Center

Within the TENCompetence project we aim to develop and integrate models and tools into an open source infrastructure for the creation, storage and exchange of learning objects, suitable knowledge...

D7.2 Compilation of internal deliverable outcomes ID7.3-ID7.10 (2008)

Herder, Eelco, Kärger, Philip, Olmedilla, Daniel, Hernández, Davinia, Gilabert, Sandra, Giradin, Fabien, ...

Summary of the results of TENCompetence WP7 during the first 30 months. Progress towards a learning path description. Background research and tools for curriculum planning and authoring. Description...

Social Software for Lifelong Competence Development: Challenges and Infrastructure (2008)

Marenzi, Ivana, Demidova, Elena, Nejdl, Wolfgang, Olmedilla, Daniel, Zerr, Sergej

Marenzi, I., Demidova, E., Nejdl, W., Olmedilla, D., & Zerr, S. (2008). Social Software for Lifelong Competence Development: Challenges and Infrastructure. International Journal of Emerging...

Preface (2008)

Piero A. Bonatti, Li Ding, Tim Finin, Daniel Olmedilla, Ii Piero, A. Bonatti, ...

Policies are pervasive in web applications. They play crucial roles in enhancing security, privacy and usability of distributed services, and indeed may determine the success (or failure) of a web...

Zerber: r-Confidential Indexing for Distributed Documents (2008)

Zerr, Sergej, Demidova, Elena, Olmedilla, Daniel, Nejdl, Wolfgang, Winslett, Marianne, Mitra, Soumyadeb

Zerr, S., Demidova, E., Olmedilla, D., Nejdl, W., Winslett, M., & Mitra, S. (2008). Zerber: r-Confidential Indexing for Distributed Documents. In J. Teubner (Eds.), Proceedings of the 11th...

Services for Knowledge Resource Sharing & Management in an Open Source Infrastructure for Lifelong Competence Development * (2008)

Elena Demidova, Daniel Olmedilla, Stefaan Ternier, Erik Duval, Michele Dicerto, Carlos Mendez, ...

Access to learning information is still restricted due to the lack of technical and semantic interoperability, locking knowledge resources in disconnected islands. This situation does not provide...

Chapter 1 RULE-BASED POLICY SPECIFICATION (2008)

Grigoris Antoniou, Matteo Baldoni, Piero A. Bonatti, Wolfgang Nejdl, Daniel Olmedilla

Abstract Policy-based access control is nowadays a common mechanism to protect data in distributed environments. However, the word policy has been given many different meanings and is used in...

Policydriven negotiation for authorization in the semantic grid (2008)

Ionut Constandache, Daniel Olmedilla, Frank Siebenlist, Wolfgang Nejdl

As in many Grid Services deployments the clients and servers reside in different administrative domains, there is both a requirement to discover each other’s authorization policy in order to be...

Zerber: r-Confidential Indexing for Distributed Documents (2008)

Sergej Zerr, Elena Demidova, Daniel Olmedilla, Wolfgang Nejdl, Marianne Winslett, Soumyadeb Mitra

To carry out work assignments, small groups distributed within a larger enterprise often need to share documents among themselves while shielding those documents from others ’ eyes. In this...

Joint International Workshop on Professional Learning, Competence Development and Knowledge Management- LOKMOL and L3NCD (2008)

Martin Memmel, Eric Ras, Stephan Weibelzahl (lokmol, Daniel Burgos, Daniel Olmedilla, Martin Wolpers (lncd

In many organizations most working processes are very knowledge intensive and involve many people working at different locations and on different tasks. The context in which people are working is...

Exploiting Policies in an Open Infrastructure for Lifelong Learning (2008)

Arne W. Koesling, Daniel Olmedilla

Abstract. Nowadays, people are in need for continuous learning in order to keep up to date or be upgraded in their job. An infrastructure for lifelong learning requires continuous adaptation to...

Policy-driven Negotiation for Authorization in the Grid Abstract (2008)

Ionut Constandache, Daniel Olmedilla

In many Grid services deployments, the clients and servers reside in different administrative domains. Hence, there is a requirement both to discover each other’s authorization policy, in order to...

Access Control for Sharing Semantic Data across Desktops (2008)

Ekaterini Ioannou, Arne Koesling, Wolfgang Nejdl, Daniel Olmedilla

Abstract. Personal Information Management (PIM) systems aim to provide convenient access to all data and metadata on a desktop to the user itself as well as the co-workers. Obviously, sharing desktop...

Building Blocks for a Smart Space for Learning TM (2008)

Bernd Simon, Stefan Sobernig, Fridolin Wild, Ra Aguirre, Stefan Brantner, Peter Dolog, ...

This case study summarizes the demonstration of a semantic network of interoperable educational systems referred to as Smart Space for Learning TM. We started connecting several educational nodes in...

Social Software for Lifelong Competence Development: Challenges and Infrastructure (2008)

Sergej Zerr, Daniel Olmedilla, Wolfgang Nejdl, Elena Demidova, Ivana Marenzi

Within the TENCompetence project we aim to develop and integrate models and tools into an open source infrastructure for the creation, storage and exchange of learning objects, suitable knowledge...

Curriculum Planner Service - Specification and Implementation (2007)

Kärger, Philipp, Olmedilla, Daniel, Brunkhorst, Ingo

For a learner it is difficult to find a path of learner activities yielding a certain learning goal. The desired path depends on various variable, be it the amount of time available, the knowledge...

Exploiting Policies in an Open Infrastructure for Lifelong Learning (2007)

De Coi, Juri L., Koesling, Arne, Kaerger, Philipp, Olmedilla, Daniel

De Coi, J. L., Kösling, A., Kärger, P., Olmedilla, D., (2007) Exploiting Policies in an Open Infrastructure for Lifelong Learning. In Duval, E., Klamma, R. and Wolpers, M. (Eds.), Second European...

Metadata Extraction and Search Interfaces - Specification (2007)

Demidova, Elena, Zenz, Gideon, Olmedilla, Daniel

The Metadata Extraction and Search Interfaces offer a framework which allows for crawling specific knowledge resources and extraction their metadata. Furthermore, extracted metadata can be made...

Preference Search Service - Specification and Implementation (2007)

Kaerger, Philipp, Herder, Eelco, Abel, Fabian, Olmedilla, Daniel, Siberski, Wolf

While the growing number of learning resources increases the   choice for learners, it also makes it more and more difficult to  ...

Services for Knowledge Resource Sharing & Management in an Open Source Infrastructure for Lifelong Competence Development (2007)

Demidova, Elena, Kaerger, Philipp, Olmedilla, Daniel, Ternier, Stefaan, Duval, Erik, Dicerto, Michele, ...

Demidova, E., Kärger, P., Olmedilla, D., Ternier, S., Duval, E., Dicerto, M., Mendez, C., Stefanov, K., (2007). Services for Knowledge Resource Sharing & Management in an Open Source Infrastructure...

Exploiting Preference Queries for Searching Learning Resources (2007)

Abel, Fabian, Herder, Eelco, Kärger, Philipp, Olmedilla, Daniel, Siberski, Wolf

While the growing number of learning resources increases the choice for learners, it also makes it more and more difficult to find suitable courses. Thus, improved search capabilities on learning...

Integration of Heterogeneous Information Sources into a Knowledge Resource Management System for Lifelong Learning (2007)

Demidova, Elena, Ternier, Stefaan, Olmedilla, Daniel, Duval, Erik, Dicerto, Michele, Stefanov, Krassen, ...

Demidova, E., Ternier, S., Olmedilla, D., Duval, E., Dicerto, M., Stefanov, K., et al. (2007). Integration of Heterogeneous Information Sources into a Knowledge Resource Management System for...

A Model for Competence Gap Analysis (2007)

Lofi, Christoph, Olmedilla, Daniel, Papapetrou, Odysseas, Siberski, Wolf, De Coi, Juri Luca, Koesling, Arne, ...

Modeling competences is an integral part of many Human Resource (HR) and e-Learning related activities. HR departments use competence descriptions to define requirements needed for performing...

Services for Knowledge Resource Sharing & Management in an Open Source Infrastructure for Lifelong Competence Development (2007)

Demidova, Elena, Kärger, Philipp, Olmedilla, Daniel, Ternier, Stefaan, Duval, Erik, Dicerto, Michelle, ...

Access to learning information is still restricted due to the lack of technical and semantic interoperability, locking knowledge resources in disconnected islands. This situation does not provide...

Enabling advanced and context-dependent access control in RDF stores (2007)

Fabian Abel, Juri Luca, De Coi, Nicola Henze, Arne Wolf Koesling, Daniel Krause, ...

Abstract. Semantic Web databases allow efficient storage and access to RDF statements. Applications are able to use expressive query languages in order to retrieve relevant metadata to perform...

Rule-based policy representation and reasoning for the semantic web (2007)

Piero A. Bonatti, Daniel Olmedilla

Summary. The Semantic Web aims at enabling sophisticated and autonomic machine to machine interactions without human intervention, by providing machines not only with data but also with its meaning...

A model for competence gap analysis (2007)

Eelco Herder, Arne Koesling, Christoph Lofi, Daniel Olmedilla, Odysseas Papapetrou, ...

Abstract: Modeling competences is an integral part of many Human Resource (HR) and e-Learning related activities. HR departments use competence descriptions to define requirements needed for...

TENCompetence (2006)

Luccini, A.Marco, Dicerto, Michele, Sloep, Peter, Koper, Rob, Kew, Chris, Olmedilla, Daniel, ...

This very technical meeting hosted by Giunti Labs in Sestri Levante (Italy) on 13-14 November 2006, has provided the great opportunity to present "European perspectives on the application of web...

TENCompetence: Construyendo la Red Europea para el Desarrollo Continuo de Competencias (2006)

Burgos, Daniel, Herder, Eelco, Olmedilla, Daniel

Burgos, D., Herder, E., & Olmedilla, D. (2007). TENCompetence: Construyendo la Red Europea para el Desarrollo Continuo de Competencias. Inteligencia Artificial, Revista Iberoamericana de Inteligencia...

Joint International Workshop on Professional Learning, Competence Development and Knowledge Management - LOKMOL and L3NCD (2006)

Memmel, Martin, Ras, Eric, Weibelzahl, Stephan, Burgos, Daniel, Olmedilla, Daniel, Wolpers, Martin

Memmel, M., Ras, E., Weibelzahl, S., Burgos, D., Olmedilla, D., & Wolpers, M. (2006). Joint International Workshop on Professional Learning, Competence Development and Knowledge Management - LOKMOL...

European Lifelong Competence Development: Requirements and Technologies for Its Realisation (2006)

Herder, Eelco, Koesling, Arne, Olmedilla, Daniel, Hummel, Hans, Schoonenboom, Judith, Moghnieh, Ayman, ...

Please, cite this publication as: Herder, E., Koesling, A., Olmedilla, D., Hummel, H., Schoonenboom, J., Moghnieh, A., & Vervenne, L. (2006). European Lifelong Competence Development: Requirements...

Building blocks for the educational web: Elena's smart space for learning (2006)

Simon, Bernd, Sobernig, Stefan, Wild, Fridolin, Aguirre, Sandra, Brantner, Stefan, Dolog, Peter, ...

Bernd Simon, Stefan Sobernig, Fridolin Wild, Sandra Aguirre, Stefan Brantner, Peter Dolog, Gustaf Neumann, Gernot Huber, Tomaz Klobucar, Sascha Markus, Zoltán Miklós, Wolfgang Nejdl, Daniel...

A Distributed Tabling Algorithm for Rule Based Policy Systems (2006)

Miguel Alves, Carlos Viegas Damasio, Wolfgang Nejdl, Daniel Olmedilla

Distributed Peer-to-Peer and Grid infrastructure require distributed access control mechanisms. These mechanisms can be implemented in distributed trust management infrastructures and usually require...

Spinning interoperable applications for teaching & learning using the simple query interface (2006)

Frans Van Assche, Erik Duval, David Massart, Daniel Olmedilla, Bernd Simon, Stefan Sobernig, ...

The Web puts a huge number of learning resources within reach of anyone with Internet access. However, many valuable resources are difficult to find due to the lack of interoperability among learning...

L.: “European lifelong competence development: requirements and technologies for its realisation (2006)

Eelco Herder, Arne Koesling, Daniel Olmedilla, Ayman Moghnieh

Abstract – In the TenCompetence project, we aim to address the growing need for lifelong development with an open source framework for competence development programmes. We envisage that the...

Security and privacy on the semantic web (2006)

Daniel Olmedilla

Summary. The Semantic Web aims at enabling sophisticated and autonomic machine to machine interactions without human intervention, by providing machines not only with data but also with its meaning...

Security and Trust Issues in Semantic Grids (2006)

Olmedilla, Daniel, Rana, Omer F., Matthews, Brian, Nejdl, Wolfgang

Grid computing allows sharing of services and resources accross institutions. However, current Grid security mechanisms for authentication and authorization are too rigid and they lack the ability to...

Knowledge Management- LOKMOL and L3NCD (2006)

Gmbh Germany, Andrea Back (switzerland, Ines Grützner (germany, Stefanie Lindstaedt (austria, David Wiley (usa, Sandra Zilles (germany, ...

In many organizations most working processes are very knowledge intensive and involve many people working at different locations and on different tasks. The context in which people are working is...

T.: Corner Stones of Semantic Interoperability Demonstrated in a Smart Space for Learning (2005)

Ra Aguirre, Stefan Brantner, Gernot Huber, Sascha Markus, Zoltán Miklós, Alberto Mozo, ...

This paper summarizes the demonstration of a semantic network of interoperable educational systems. Based on a standardized query API, plus a common schema for querying and results presentation as...

Driving and Monitoring Provisional Trust Negotiation with Metapolicies (2005)

Piero Bonatti, Daniel Olmedilla

We introduce the provisional trust negotiation framework PROTUNE, for combining distributed trust management policies with provisional-style business rules and accesscontrol related actions. The...

Ontology-Based Policy Specification and Management (2005)

Wolfgang Nejdl, Daniel Olmedilla, Marianne Winslett, Charles C. Zhang

The World Wide Web makes it easy to share information and resources, but offers few ways to limit the manner in which these resources are shared. The specification and automated enforcement of...

Policy Based Dynamic Negotiation for Grid Services (2005)

Authorization Ionut Constandache, Ionut Const, Daniel Olmedilla, Wolfgang Nejdl

Policy-based dynamic negotiations allow more flexible authorization in complex Grid environments, and relieve both users and administrators from up front negotiations and registrations. This paper...

Security and Trust Issues in Semantic Grids (2005)

Daniel Olmedilla, Omer F. Rana, Brian Matthews, Wolfgang Nejdl

Grid computing allows sharing of services and resources accross institutions. However, current Grid security mechanisms for authentication and authorization are too rigid and they lack the ability to...

Interoperability for Peer-to-Peer Networks: Opening P2P to the Rest of the World (2005)

Daniel Olmedilla, Matthias Palmer

Due to the information growth, distributed environments are o#ered as a feasible and scalable solution where Peerto -Peer networks have become more relevant. They bring many advantages as high...

An Integration of Reputation-based and Policy-based Trust Management (2005)

Piero Bonatti, Claudiu Duma, Daniel Olmedilla, Nahid Shahmehri

Trust management is currently being tackled from two different perspectives: a "strong and crisp" approach, where decisions are founded on logical rules and verifiable properties encoded in...

Z.: A simple query interface for interoperable learning repositories (2005)

Bernd Simon, David Massart, Frans Van Assche, Stefaan Ternier, Erik Duval, Stefan Brantner, ...

In order to achieve interoperability among learning repositories, implementers require a common communication framework for querying. This paper proposes a set of methods referred to as Simple Query...

Interoperability for Peer-to-Peer Networks: Opening P2P to the rest of the World (2005)

Ingo Brunkhorst, Daniel Olmedilla

Abstract. Due to the information growth, distributed environments are offered as a feasible and scalable solution. Peer-to-Peer (P2P) networks have become one of the most important and used...

Negotiating Trust on the Grid (2005)

Basney, Jim, Nejdl, Wolfgang, Olmedilla, Daniel, Welch, Von, Winslett, Marianne

Grids support dynamically evolving collections of resources and users, usually spanning multiple administrative domains. The dynamic and crossorganizational aspects of Grids introduce challenging...

The Pudding of Trust (2004)

Staab, Steffen, Bhargava, Bharat, Lilien, Leszek, Rosenthal, Arnon, Winslett, Marianne, Sloman, Morris, ...

Trust - "reliance on the integrity, ability, or character of a person or thing" - is pervasive in social systems. We constantly apply it in interactions between people, organizations, animals, and...

The Pudding of Trust (2004)

Staab, Steffen, Bhargava, Bharat, Lilien, Leszek, Rosenthal, Arnon, Winslett, Marianne, Sloman, Morris, ...

Trust - "reliance on the integrity, ability, or character of a person or thing" - is pervasive in social systems. We constantly apply it in interactions between people, organizations, animals, and...

Rule-based Policy Specification: State of the Art and Future Work (2004)

Joachim Peer, Piero A. Bonatti, Nahid Shahmehri, Claudiu Duma, Daniel Olmedilla, Wolfgang Nejdl, ...

This report provides an overview of the existing approaches to logic and rule-based system behavior specification in the light of the peculiar needs of business and security rules. It identifies...

The Pudding of Trust (2004)

Staab, Steffen, Bhargava, Bharat, Lilien, Leszek, Rosenthal, Arnon, Winslett, Marianne, Sloman, Morris, ...

Trust - "reliance on the integrity, ability, or character of a person or thing" - is pervasive in social systems. We constantly apply it in interactions between people, organizations, animals, and...

No registration needed: How to use declarative policies and negotiation to access sensitive resources on the semantic web (2004)

Rita Gavriloaie, Wolfgang Nejdl, Daniel Olmedilla, Kent E. Seamons, Marianne Winslett

Abstract. Gaining access to sensitive resources on the Web usually involves an explicit registration step, where the client has to provide a predetermined set of information to the server. The...

How to Exploit Ontologies in Trust Negotiation (2004)

Travis Leithead, Wolfgang Nejdl, Daniel Olmedilla, Kent E. Seamons, Marianne Winslett, Ting Yu, ...

The World Wide Web makes it easy to share information and resources, but offers few ways to limit the manner in which these resources are shared. The specification and automated enforcement of...

PROS: A Personalized Ranking Platform for Web Search (2004)

Paul Alexandru Chirita, Paul Alex, Ru Chirita, Daniel Olmedilla, Wolfgang Nejdl

Current search engines rely on centralized page ranking algorithms which compute page rank values as single (global) values for each Web page. Recent work on topic-sensitive PageRank [6] and...

Trust Negotiation for Semantic Web Services (2004)

Daniel Olmedilla Rub, Daniel Olmedilla, Rubén Lara, Axel Polleres, Holger Lausen

Semantic Web Services enable the dynamic discovery of services based on a formal, explicit specification of the requester needs. The actual Web Services that will be used to satisfy the...

Finding Related Pages Using the Link Structure of the WWW (2004)

Paul-Alexandru Chirita, Paul Alex, Ru Chirita, Daniel Olmedilla, Wolfgang Nejdl

Most of the current algorithms for finding related pages are exclusively based on text corpora of the WWW or incorporate only authority or hub values of pages. In this paper, we present HubFinder, a...

PeerTrust: Automated Trust Negotiation for Peers on the Semantic Web (2004)

Wolfgang Nejdl, Daniel Olmedilla, Marianne Winslett

Researchers have recently begun to develop and investigate policy languages to describe trust and security requirements on the Semantic Web. Such policies will be one component of a run-time system...

Finding Related Pages Using the Link Structure of the WWW (2004)

Paul Alexandru Chirita, Paul Alex, Ru Chirita, Daniel Olmedilla, Wolfgang Nejdl

Most of the current algorithms for finding related pages are exclusively based on text corpora of the WWW or incorporate only authority or hub values of pages. In this paper, we present HubFinder, a...

How to Exploit Ontologies in Trust Negotiation (2004)

Travis Leithead Wolfgang, Wolfgang Nejdl, Daniel Olmedilla, Kent E. Seamons, Marianne Winslett, Ting Yu, ...

The World Wide Web makes it easy to share information and resources, but offers few ways to limit the manner in which these resources are shared. The specification and automated enforcement of...

Rule-based Policy Specification: State of the Art and Future Work (2004)

Future Work, Piero A. Bonatti, Nahid Shahmehri, Claudiu Duma, Daniel Olmedilla, Wolfgang Nejdl, ...

This report provides an overview of the existing approaches to logic and rule-based system behavior specification in the light of the peculiar needs of business and security rules. It identifies...

How to exploit ontologies in trust negotiation (2004)

Travis Leithead, Wolfgang Nejdl, Daniel Olmedilla, Kent E. Seamons, Marianne Winslett, Ting Yu, ...

Abstract. The World Wide Web makes it easy to share information and resources, but offers few ways to limit the manner in which these resources are shared. The specification and automated enforcement...

Rule-based Policy Specification: State of the Art and Future Work (2004)

Future Work, Reviewer(s) G. Wagner, Piero A. Bonatti, Nahid Shahmehri, Claudiu Duma, Daniel Olmedilla, ...

This report provides an overview of the existing approaches to logic and rule-based system behavior specification in the light of the peculiar needs of business and security rules. It identifies...

Finding Related Hubs and Authorities (2003)

Paul-Alexandru Chirita, Daniel Olmedilla, Wolfgang Nejdl, Deutscher Pavillon, Expo Plaza

In this paper a new algorithm for finding hubs (and authorities) related to a specific Web page is presented. Various aspects have been investigated in this direction, like extensions of the HITS...

PROS: A Personalized Ranking Platform for Web Search (2003)

Paul-Alexandru Chirita, Paul Alex, Ru Chirita, Daniel Olmedilla, Wolfgang Nejdl

Current search engines rely on centralized page ranking algorithms which compute page rank values as single (global) values for each Web page. Recent work on topic-sensitive PageRank [6] and...

PeerTrust: Automated Trust Negotiation for Peers on the Semantic Web (2003)

Wolfgang Nejdl, Daniel Olmedilla, Marianne Winslett

Researchers have recently begun to develop and investigate policy languages to describe trust and security requirements on the Semantic Web [14, 24]. Such policies will be one component of a run-time...

2.1 The World Wide Web...................... 10 2.2 Crawlers and Search Engines................... 11 (2003)

Daniel Olmedilla

or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior permission.

Realizing interoperability of e-learning repositories

Olmedilla, Daniel, Castells Azpilicueta, Pablo, Nejdl, W.

Tesis doctoral inédita. Universidad Autónoma de Madrid, Escuela Politécnica Superior, marzo 2007

Realizing interoperability of e-learning repositories

Olmedilla, Daniel

Anexos : resultados de los experimentos. - índice de figuras