Published on March 10, 2014
Motivation Data on the Web Some eyecatching opener illustrating growth and or diversity of web data Learning & Education with the Web of Data Stefan Dietze (L3S Research Center, DE, @stefandietze, http://purl.org/dietze) Stefan Dietze 10/03/14
Research areas Web science, Information Retrieval, Semantic Web & Linked Data, data & knowledge integration (mapping, classification, interlinking) Application domains: education/TEL, Web archiving, … Some projects Introduction http://www.l3s.de/ Stefan Dietze 10/03/14 2 See also: http://purl.org/dietze (Linked) Web data & education Early activities in the field: tutorials, workshops, competitions (LILE – Linked Learning, LAK Data Challenge…) http://linkededucation.org & http://linkeduniversities.org
Open Education requires Open Data (Open) Educational Resources World Wide Web Distance Universities Linked Open Data MOOCs Stefan Dietze 10/03/14 http://linkededucation.org & http://linkeduniversities.org
Actually, how “open” is open educational data? Just a short while ago... Educational Data on the Web Open Educational Resource (OER) metadata & MOOC collections (e.g. OCW, OpenLearn, Merlot, Coursera) Competing Web interfaces (e.g. OAI-PMH, SOAP, REST) Competing metadata standards (e.g. IEEE LOM, ADL SCORM, DC…) & taxonomies & exchange formats (JSON, RDF, XML) Issues: heterogeneity & lack of interoperability Stefan Dietze 10/03/14
Actually, how “open” is open educational data? Just a short while ago... Linked (Open) Data Vision: well connected graph of open Web data W3C standards (RDF, SPARQL) to expose data, URIs to interlink datasets => cloud of interconnected datasets 32 billion triples (2011), crossing all sorts of domains Other incarnations: Google Knowledge Graph, schema.org, FB Open Graph… Educational Data on the Web Open Educational Resource (OER) metadata & MOOC collections (e.g. OCW, OpenLearn, Merlot, Coursera) Competing Web interfaces (e.g. OAI-PMH, SOAP, REST) Competing metadata standards (e.g. IEEE LOM, ADL SCORM, DC…) & taxonomies & exchange formats (JSON, RDF, XML) Issues: heterogeneity & lack of interoperability Pictures (c) by Paul Miller Stefan Dietze 10/03/14
A shorter while ago Bringing OER into the LOD landscape http://datahub.io/dataset/meducator Manually curated and automatically exported & enriched OER from variety of sources > 35000 triples so far > enrichments to DBpedia & Bioportal ontologies APIs used by several applications Automated data lifting & enrichment Stefan Dietze 10/03/14
Using LD in (medical) educational applications Recommending educational resources across repositories http://metamorphosis.med.duth.gr Using LD for integrating educational resources from range of universities and OER repositories (eg Open Learn, Open Courseware etc)
“Structured” descriptions of OER? http://metamorphosis.med.duth.gr Metadata of educational resource (virtual patient) lifted into RDF
? Making sense of (medical) educational data Stefan Dietze 10/03/14
? ? ? ? Making sense of (medical) educational resources
! ! Entity recognition (NER) & disambiguation, via Stefan Dietze 10/03/14 Adding semantics to OER descriptions
! Disease Life Sciences Medicine ofType One simple link – lots of knowledge/semantics Stefan Dietze 10/03/14
before vs after Embedding educational repositories into a joint graph
Linked Data for Learning – How is it useful? Stefan Dietze 1. Linked Data for data sharing, enrichment and interpretation RDF, SPARQL & shared vocabularies to improve interoperability of learning/user data facilitate OER reuse vision across isolated platforms 2. Linked Data as body of knowledge for learning & education Vast amount of publicly available resources and data Dedicated OER and university data + „knowledge resources“ (from DBpedia to Slideshare) Interlinking educational Resources and the Web of Data – a Survey of Challenges and Approaches, Stefan Dietze, Salvador Sanchez-Alonso, Hannes Ebner, Hong Qing Yu, Daniela Giordano, Ivana Marenzi, Bernardo Pereira Nunes, Emerald Program: electronic Library and Information Systems, Volume 47, Issue 1 (2013). Linked Data for Open and Distance Learning, Mathieu d’Aquin, report for the Common Wealth of Learning, „HTTP-accessibility“ (SPARQL, URI-dereferencing) „Structure“ & „Semantics“ (=> shared/linked vocabularies) „Interlinked“ „Persistent“ 10/03/14 http://linkededucation.org & http://linkeduniversities.org
Success models: data & applications Stefan Dietze 10/03/14 18 LinkedUp Challenge to identify innovative tools & applications Evaluation methods and approaches “LinkedUp” – Linking Web Data for Education L Data curation Technology transfer & community-building Collecting & exposing open data of educational relevance => LinkedUp Data Catalog Profiling and linking of Web Data for education => educational data graph Disseminating knowledge & building communities (educators, computer scientists, data engineers) Gathering stakeholder feedback: use cases, and requirements European project aimed at advancing take-up of open data and related technologies http://linkedup-challenge.org/#usecases http://linkedup-project.eu/events http://www.linkedup-challenge.org/ http://data.linkededucation.org http://linkedup-project.eu
LinkedUp Network LinkedUp Consortium LinkedUp Advisory Board Stefan Dietze 10/03/14 “LinkedUp” – Linking Web Data for Education L European project aimed at advancing take-up of open data and related technologies http://linkedup-project.eu
Too many/diverse datasets, too little information Stefan Dietze 10/03/14 ? ? ? Which datasets are useful & trustworthy for case XY (eg „learning about the solar system“) ? Which topics (eg „Astronomy“) are covered by dataset X? Which datasets offer videos (slides, publications, statistics etc)? ?? ?
Data curation and dataset profiling LinkedUp Dataset Catalog Stefan Dietze 10/03/14 Catalog of data (LinkedUp Catalog): classification of datasets according to resource types, disciplines/topics, data quality, accessability, etc Infrastructure for distributed/federated querying describes Which datasets are useful & trustworthy for case XY (eg „learning about the solar system“) ? Which topics (eg „Astronomy“) are covered by dataset X? Which datasets offer videos (slides, publications, statistics etc)?
LinkedUp Data Catalog in a nutshell http://datahub.io/group/linked-education http://data.linkededucation.org/linkedup/catalog/ RDF (VoID) dataset catalog: browse & query distributed datasets Live information about endpoint accessibility Federated queries using type mappings Stefan Dietze 10/03/14
What’s all the data about? - exploring topics/disciplinesll Stefan Dietze 10/03/14 Exploring of dataset-topic-graph (datasets, topics, relationships) More during demo session http://data-observatory.org/lod-profiles/ A Scalable Approach for Efficiently Generating Structured Dataset Topic Profiles, Fetahu, B., Dietze, S., Nunes, B.P., Cassanova M., Nejdl, W. (2014), 11th Extended Semantic Web Conference, ESWC2014, Greece, May 2014.
LinkedUp Challenge: using open data for learning Open Data Competition to promote tools and applications that analyse / integrate (Linked) Web data Organised by LinkedUp project over 2 years (“Veni”, “Vidi”, “Vici”) with 40.000 EUR awards Veni Competition - 22 submissions, 8 shortlisted for presentation at Open Knowledge Conference (17 September, Geneva Switzerland) Vici competition to be announced soon http://linkedup-challenge.org Stefan Dietze 10/03/14 26
“Veni” shortlist & winners DataConf. KnowNodes Mismuseos ReCredible YourHistory 10/03/14 http://www.globe-town.org/ WeShare - 3rd price / people‘s choice GlobeTown - 2nd price http://seek.cloud.gsic.tel.uva.es/weshare/ http://www.polimedia.nl/ PoliMedia – 1st price
Open educational data - some more resources LinkedUp Challenge – Vici Competition (http://www.linkedup-challenge.org) Calls coming soon Learning Analytics & Knowledge Dataset (http://lak.linkededucation.org) + associated annual challenge data.l3s.de – the L3S DataHub (http://data.l3s.de) Pointers to several of the mentioned datasets Stefan Dietze 10/03/14 28
Linked Data as enabler for educational resources sharing Interpretation of user & resource (meta)data Understanding of learning contexts Tools & data for data disambiguation and integration Cross-platform recommendations and analytics Linked Data as body of knowledge for learning Dedicated educational/learning content Repurposing of knowledge resources (social media etc) Challenge (=> LinkedUp) Noise & diversity Vici calls to be announced soon Conclusions Stefan Dietze 10/03/14 31
Thank you! WWW See also (data) http://datahub.io/group/linked-education http://data.linkededucation.org http://data.l3s.de http://data.linkededucation.org/linkedup/catalog/ http://lak.linkededucation.org See also (general) http://linkedup-project.eu http://linkedup-challenge.org http://linkededucation.org http://linkeduniversities.org http://purl.org/dietze 10/03/14 32Stefan Dietze PROFILES workshop @ ESWC2014 (http://keystone-cost.eu/profiles2014) Deadline: 14 March Linking User Data 2014 at UMAP2014 (http://liud.linkededucation.org) Deadline: 1 April Online Learning & LD Tutorial at WWW2014 (http://www2014.kr/) 07 April, Seoul
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