Change search
Link to record
Permanent link

Direct link
BETA
Publications (10 of 17) Show all publications
Ebner, H. & Palmér, M. (2014). An information model for managing resources and their metadata. Semantic Web, 5(3), 237-255
Open this publication in new window or tab >>An information model for managing resources and their metadata
2014 (English)In: Semantic Web, ISSN 1570-0844, E-ISSN 2210-4968, Vol. 5, no 3, p. 237-255Article in journal (Refereed) Published
Abstract [en]

Today information is managed within increasingly complicated Web applications which often rely on similar information models. Finding a reusable and sufficiently generic information model for managing resources and their metadata would greatly simplify development of Web applications. This article presents such an information model, namely the Resource and Metadata Management Model (ReM3). The information model builds upon Web architecture and standards, more specifically the Linked Data principles when managing resources together with their metadata. It allows to express relations between metadata and to keep track of provenance and access control. In addition to this information model, the architecture of the reference implementation is described along with a Web application that builds upon it. To show the taken approach in practice, several real-world examples are presented as showcases. The information model and its reference implementation have been evaluated from several perspectives, such as the suitability for resource annotation, a preliminary scalability analysis and the adoption in a number of projects. This evaluation in various complementary dimensions shows that ReM3 has been successfully applied in practice and can be considered a serious alternative when developing Web applications where resources are managed along with their metadata.

Place, publisher, year, edition, pages
IOS Press, 2014
Keywords
information model, metadata management, resource annotation, linked data, provenance
National Category
Information Systems Media and Communication Technology
Research subject
Media Technology; Computer Science; Information and Communication Technology
Identifiers
urn:nbn:se:kth:diva-144310 (URN)10.3233/SW-120090 (DOI)000357871400005 ()2-s2.0-84905000693 (Scopus ID)
Note

QC 20140417

Available from: 2014-04-16 Created: 2014-04-16 Last updated: 2018-01-11Bibliographically approved
Ebner, H. & Palmér, M. (2014). LDCache - A cache for linked data-driven web applications. In: CEUR Workshop Proceedings: . Paper presented at ISWC Developers Workshop 2014, ISWC-DEV 2014, Co-Located with the 13th International Semantic Web Conference, ISWC 2014, 19 October 2014 (pp. 67-73).
Open this publication in new window or tab >>LDCache - A cache for linked data-driven web applications
2014 (English)In: CEUR Workshop Proceedings, 2014, p. 67-73Conference paper, Published paper (Refereed)
Abstract [en]

Modern Web applications that make use of external data sources, be it Linked Data (LD) or not, usually run into the same problems; if a data source performs badly or is offline, the user experience is affected negatively. In some cases this may result in long response times, whereas in more extreme cases the application becomes unusable. This paper presents LDCache [4], a caching service that ensures that Linked Data-driven Web applications remain functional with good user experience regardless of the status of the external data sources they eventually integrate. First, some requirements are defined that typically occur when data from disparate sources are integrated. Then the features of the implemented solution are summarized together with documentation on how the service can be taken advantage of. This is followed by a description of the architecture. The authors conclude with a road map for future development and a short summary of the work carried out.

Keywords
Data handling, Social networking (online), World Wide Web, Caching services, External data sources, Linked datum, Offline, Road-maps, User experience, WEB application, Semantic Web
National Category
Media and Communications
Identifiers
urn:nbn:se:kth:diva-167926 (URN)2-s2.0-84908679621 (Scopus ID)
Conference
ISWC Developers Workshop 2014, ISWC-DEV 2014, Co-Located with the 13th International Semantic Web Conference, ISWC 2014, 19 October 2014
Note

QC 20150611

Available from: 2015-06-11 Created: 2015-05-22 Last updated: 2016-12-05Bibliographically approved
Ebner, H. (2014). Supporting loose forms of collaboration: Using Linked Data to realize an architecture for collective knowledge construction. (Doctoral dissertation). KTH Royal Institute of Technology
Open this publication in new window or tab >>Supporting loose forms of collaboration: Using Linked Data to realize an architecture for collective knowledge construction
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis is driven by the motivation to explore a way of working collaboratively that closely reflects the World Wide Web (WWW), more specifically the potential of the Web architecture built on Semantic Web technologies and Linked Data. The goal is to describe a generic approach and architecture that satisfies the needs for loose collaboration and collective knowledge construction as exemplified by the applications described in this thesis. This thesis focuses on a contribution-centric architecture which allows for flexible applications that support loose forms of collaboration.

The first research question deals with how Web-based collective knowledge construction can be supported. The second research question explores the characteristics of collective knowledge construction with respect to the Open World Assumption (OWA). The OWA implies that complete knowledge about a subject cannot be assumed at any time, which is one of the most fundamental properties of the WWW. The third research question investigates how Semantic Web technologies be used in order to support such a contribution-centric architecture.

The thesis and its underlying publications are of a technical character and are always grounded in theoretical models and considerations that have led to functional implementations. The research has evolved in iterative development processes and was explicitly directed at building applications that can be used in collaborative settings and that are based on standardized Web technologies. One of the main outcomes, an information model, was developed together with such an application and provides a number of novel approaches in the context in which it was designed.

The validity of the presented research is supported by evaluations from different perspectives: a list of implemented applications and showcases, results from structured interviews that have investigated the suitability for various resource annotation processes, as well as scalability aspects.

The thesis concludes that it is ultimately up to the application how "loose" the collaboration should be and to which extent the OWA is incorporated. The presented architecture provides a toolkit to support the development of loosely collaborative applications. The showcased applications allow the construction of collaborative conceptual models and to collaboratively annotate educational resources. They show the potential of the used technology stack and the introduced contribution-centric architecture that sits on top if it.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2014. p. x, 67
Series
TRITA-CSC-A, ISSN 1653-5723 ; 2014:05
Keywords
linked data, collaboration, information model, contribution, application architecture, web application, web standards, www, open world assumption
National Category
Information Systems
Research subject
Information and Communication Technology; Media Technology; Computer Science
Identifiers
urn:nbn:se:kth:diva-144311 (URN)978-91-7595-087-7 (ISBN)
Public defence
2014-05-22, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20140417

Available from: 2014-04-17 Created: 2014-04-16 Last updated: 2018-01-11Bibliographically approved
Zapico Lamela, J. L., Pargman, D., Ebner, H. & Eriksson, E. (2013). Hacking sustainability: Broadening participation through Green Hackathons. In: : . Paper presented at Fourth International Symposium on End-User Development. June 10-13, 2013, IT University of Copenhagen, Denmark.
Open this publication in new window or tab >>Hacking sustainability: Broadening participation through Green Hackathons
2013 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Green Hackathon is an international series of coding events withsustainability purpose. Developers, researchers, environmental practitioners,and anyone else who is interested, work for a limited amount of time to createinnovative software solutions for sustainability. These events have explicitlyaimed to invite a broad spectrum of expertise besides technical expertise. Thisarticle presents the experiences and tensions of including these end users at amostly technically oriented event, and discusses how end-user developmentcould be used to encourage more reflective practices and as well as broadeningthe participation and the interdisciplinary collaboration in these events – withhigher-quality as a prospective outcome.

National Category
Media Studies
Identifiers
urn:nbn:se:kth:diva-123990 (URN)
Conference
Fourth International Symposium on End-User Development. June 10-13, 2013, IT University of Copenhagen, Denmark
Note

Qc 20130719

Available from: 2013-07-08 Created: 2013-06-24 Last updated: 2013-07-19Bibliographically approved
Dietze, S., Sanchez-Alonso, S., Ebner, H., Yu, H. Q., Giordano, D., Marenzi, I. & Nunes, B. P. (2013). Interlinking educational resources and the web of data A survey of challenges and approaches. Program, 47(1), 60-91
Open this publication in new window or tab >>Interlinking educational resources and the web of data A survey of challenges and approaches
Show others...
2013 (English)In: Program, ISSN 0033-0337, E-ISSN 1758-7301, Vol. 47, no 1, p. 60-91Article in journal (Refereed) Published
Abstract [en]

Purpose - Research in the area of technology-enhanced learning (TEL) throughout the last decade has largely focused on sharing and reusing educational resources and data. This effort has led to a fragmented landscape of competing metadata schemas, or interface mechanisms. More recently, semantic technologies were taken into account to improve interoperability. The linked data approach has emerged as the de facto standard for sharing data on the web. To this end, it is obvious that the application of linked data principles offers a large potential to solve interoperability issues in the field of TEL. This paper aims to address this issue. Design/methodology/approach - In this paper, approaches are surveyed that are aimed towards a vision of linked education, i.e. education which exploits educational web data. It particularly considers the exploitation of the wealth of already existing TEL data on the web by allowing its exposure as linked data and by taking into account automated enrichment and interlinking techniques to provide rich and well-interlinked data for the educational domain. Findings - So far web-scale integration of educational resources is not facilitated, mainly due to the lack of take-up of shared principles, datasets and schemas. However, linked data principles increasingly are recognized by the TEL community. The paper provides a structured assessment and classification of existing challenges and approaches, serving as potential guideline for researchers and practitioners in the field. Originality/value - Being one of the first comprehensive surveys on the topic of linked data for education, the paper has the potential to become a widely recognized reference publication in the area.

Keywords
Linked data, Education, Technology-enhanced learning, Semantic web, Web data, Open educational resources, Information technology, Learning methods
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:kth:diva-120567 (URN)10.1108/00330331211296312 (DOI)000316164300004 ()2-s2.0-84873460445 (Scopus ID)
Note

QC 20130412

Available from: 2013-04-12 Created: 2013-04-11 Last updated: 2018-01-11Bibliographically approved
Klerxk, J. & Ebner, H. (2011). Contextual Open Educational Resources for Future Recommender Scenarios. In: dataTEL workshop – Data Sets for Technology Enhanced Learning. Paper presented at Alpine Rendez-Vous. La Clusaz, France. 29-31 March 2011.
Open this publication in new window or tab >>Contextual Open Educational Resources for Future Recommender Scenarios
2011 (English)In: dataTEL workshop – Data Sets for Technology Enhanced Learning, 2011Conference paper, Published paper (Refereed)
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:kth:diva-50192 (URN)
Conference
Alpine Rendez-Vous. La Clusaz, France. 29-31 March 2011
Note
QC 20111206Available from: 2011-12-02 Created: 2011-12-02 Last updated: 2018-01-12Bibliographically approved
Sicilia, M.-A., Ebner, H., Sanchez-Alonso, S., Alvarez, F., Abian, A. & Garcia-Barriocanal, E. (2011). Navigating learning resources through linked data: A preliminary report on the re-design of organic.edunet. In: Linked Learning 2011 eLearning Approaches for the Linked Data Age: Proceedings of Linked Learning 2011: the 1st International Workshop on eLearning Approaches for the Linked Data Age. Paper presented at 1st International Workshop on eLearning Approaches for the Linked Data Age, Linked Learning 2011 - Co-located with the 8th Extended Semantic Web Conference, ESWC 2011; Heraklion; Greece; 29 May 2011 through 29 May 2011 (pp. 1-8). Rheinisch-Westfaelische Technische Hochschule Aachen
Open this publication in new window or tab >>Navigating learning resources through linked data: A preliminary report on the re-design of organic.edunet
Show others...
2011 (English)In: Linked Learning 2011 eLearning Approaches for the Linked Data Age: Proceedings of Linked Learning 2011: the 1st International Workshop on eLearning Approaches for the Linked Data Age, Rheinisch-Westfaelische Technische Hochschule Aachen , 2011, p. 1-8Conference paper, Published paper (Refereed)
Abstract [en]

Learning objects repositories have grown and matured in the last years, being currently a cornerstone for open education. Several current systems are offering metadata openly through mainstream harvesting protocols or providing standardized query interfaces. Also, the use of standardized vocabularies or ontologies is becoming more common to provide a degree of semantic interoperability. However, learning object metadata is typically not linked across repositories, and it is not providing a way to navigate by using other sources of data available on the Web. The linked open data (LOD) approach provides the framework for the evolution of learning object repositories into a more flexible system of sharing learning resource metadata. This paper describes how linked data has been integrated in the design and redesign of the export mechanisms of Organic.Edunet, a federation of learning repositories in the domain of organic agriculture that uses an RDF store and several ontologies to browse and search resources. The paper focuses on how the existing search and semantic browsing mechanisms can benefit from the use of LOD across repositories.

Place, publisher, year, edition, pages
Rheinisch-Westfaelische Technische Hochschule Aachen, 2011
Series
CEUR Workshop Proceedings, ISSN 1613-0073 ; 717
Keywords
Learning objects, Linked data, Ontologies, Organic.edunet, Repositories
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:kth:diva-50194 (URN)2-s2.0-84891907482 (Scopus ID)
Conference
1st International Workshop on eLearning Approaches for the Linked Data Age, Linked Learning 2011 - Co-located with the 8th Extended Semantic Web Conference, ESWC 2011; Heraklion; Greece; 29 May 2011 through 29 May 2011
Note

QC 20111206

Available from: 2011-12-02 Created: 2011-12-02 Last updated: 2018-01-12Bibliographically approved
Bonanni, L., Ebner, H., Hockenberry, M., Sayan, B., Brandt, N., Csikszentmihàlyi, N., . . . Zapico Lamela, J. L. (2011). Sourcemap.org: First Application of Linked and Open LCA Data to Support Sustainability. Paper presented at International Conference on Industrial Ecology. 7-10 June 2011, Berkely 2011..
Open this publication in new window or tab >>Sourcemap.org: First Application of Linked and Open LCA Data to Support Sustainability
Show others...
2011 (English)Conference paper, Published paper (Refereed)
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:kth:diva-63165 (URN)
Conference
International Conference on Industrial Ecology. 7-10 June 2011, Berkely 2011.
Note

Poster. QC 20120410

Available from: 2012-01-22 Created: 2012-01-22 Last updated: 2018-01-12Bibliographically approved
Palavitsinis, N., Ebner, H., Manouselis, N. & Sanchez-Alonso, S. (2011). Using E-Learning technologies and standards to make educational content available: The Organic.Edunet approach. Journal of Information Technology in Agriculture, 4(1)
Open this publication in new window or tab >>Using E-Learning technologies and standards to make educational content available: The Organic.Edunet approach
2011 (English)In: Journal of Information Technology in Agriculture, ISSN 1546-959X, Vol. 4, no 1Article in journal (Refereed) Published
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:kth:diva-50189 (URN)
Note
QC 20111206Available from: 2011-12-02 Created: 2011-12-02 Last updated: 2018-01-12Bibliographically approved
Manouselis, N., Kastrantas, K., Sanchez-Alonso, S., Caceres, J., Ebner, H., Palmér, M. & Naeve, A. (2009). Architecture of the Organic.Edunet Web Portal. International Journal of Web Portals, 1(1), 71-91
Open this publication in new window or tab >>Architecture of the Organic.Edunet Web Portal
Show others...
2009 (English)In: International Journal of Web Portals, ISSN 1938-0194, Vol. 1, no 1, p. 71-91Article in journal (Refereed) Published
Abstract [en]

The use of Semantic Web technologies in educational Web portals has been reported to facilitate users 'search, access, and retrieval of learning resources. To achieve this, a number of different architectural components and services need to be harmonically combined and implemented. This article presents how this issue is dealt with in the context of a large-scale case study. More specifically, it describes the architecture behind the Organic. Edunet Web portal that aims to provide access to a federation of repositories with learning resources on agricultural topics. The various components of the architecture are presented and the supporting technologies are explained. In addition, the article focuses on how Semantic Web technologies are being adopted, specialized, and put in practice in order to facilitate ontology-aided sharing and reusing of learning resources.

Place, publisher, year, edition, pages
Information Resources Management Association, 2009
Keywords
Learning object, organic farming, semantic web, web portal
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:kth:diva-50103 (URN)2-s2.0-70350127619 (Scopus ID)
Note
QC 20111202Available from: 2011-12-01 Created: 2011-12-01 Last updated: 2018-01-12Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-3869-5413

Search in DiVA

Show all publications