WWW2014 Tutorial: Online Learning & Linked Data - Lessons Learned

http://www.euclid-project.eu/events/online-learning-and-linked-data-www2014

Motivation
Data on the Web
Some eyecatching opener illustrating growth and or diversity of web data
Linked Data as enabler for Open Education
Stefan Dietze
(L3S Research Center, DE,
@stefandietze,
http://purl.org/dietze)
Stefan Dietze 03/04/14

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 03/04/14 3
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

Educational Data/Resources on the Web
(Open) Educational Resources
World
Wide
Web
Distance Universities
Linked Open Data
MOOCs
 http://linkededucation.org &
 http://linkeduniversities.org

Linked Data: Pluto & the seven Dwarfs?
„…solar
system…
#pluto“
pluto the dwarf planet ?

“A little semantics goes a long way” (J. Hendler1)
dbp:CelestialBody
dbp:Pluto
dbp:Pluto(mythology)
typeOf
dwarfPlanetOf
Semantic Web
 Adding meaning through
shared vocabularies and
schemas (eg DBpedia)
 W3C standards RDF &
SPARQL for data &
knowledge representation
and querying
 Persistent URIs to reference
& interlink data on the Web
1 Hendler, J., The Dark Side of the Semantic Web, IEEE Intelligent Systems, Jan/Feb 2007
yago:AstronomicalObjects
typeOf
dbp:SolarSystem
dbp:DwarfPlanetPluto
redirectOf
namedAfter
„…solar
system…
#pluto“

Semantic Web / Linked Data
FOAF
Gene
Ontology
BIBO
Geo
Ontology
DBpedia
Ontology
Dublin
Core
BBC
Program
mes
 De-facto standard for sharing data on the Web
 Vision: well connected graph of open Web data
 350+ datasets and 50 billion triples in LOD Cloud alone
 Other „incarnations“:
 Google Knowledge Graph
 Facebook Open Graph
 http://schema.org
Stefan Dietze
 „HTTP-accessibility“
(SPARQL, URI-dereferencing)
 „Structure“ & „Semantics“
(=> shared/linked vocabularies)
 „Interlinked“
 „Persistent“
03/04/14

World
Wide
Web
Distance Universities
Linked Open Data
MOOCs
(Open) Educational Resources
Actually, how “open” is open educational data?

Educational schemas/vocabularies – a case of „XKCD927“?
https://xkcd.com/927/
eg OER schemas, vocabularies, interfaces etc

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

Educational Data & Linked Data?
Linked (Open) Data
 Vision: well connected graph of open Web data
 W3C standards (RDF, SPARQL) to expose data, URIs to
interlink datasets
 Linking of schemas, vocabularies, data =>
interoperability
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

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

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 resources
?

!
!
Entity recognition (NER)
& disambiguation, via
Adding semantics to OER descriptions

Disease
Life Sciences
Medicine ofType
One simple link – lots of knowledge/semantics

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,
03/04/14

„Success models“:
data & applications
 LinkedUp Challenge
to identify innovative
tools & applications
 Evaluation methods
and approaches
“LinkedUp” – Linking Web Data (for Education)
L
Data curation &
profiling
Technology transfer
& community-building
 Collecting & exposing open
data of educational relevance
=> LinkedUp Data Catalog
 Profiling and linking of Web
Data => profiles of educational
datasets
 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://linkedup-project.eu
http://data.linkededucation.org

Stefan Dietze
Who we areL
LinkedUp Network
LinkedUp Consortium
LinkedUp Advisory Board

Too many/diverse datasets, too little information
?
?
? ?? ?
 Which datasets are useful & trustworthy for case
XY (eg „learning about the solar system“) ?
 Which topics (eg „Astronomy“) are covered?
 Accessability/reliability?
 Which datasets describe/offer videos (slides,
publications, statistics etc)?

Curating a catalog of data for education
LinkedUp
Dataset Catalog
 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?
 Accessability/reliability?
 Which datasets describe/offer videos (slides,
publications, statistics etc)?

db:Astro. Objects
Building a registry for educational datasets
Dataset
Metadata
BIBO
AAISO
FOAF
contains
Entity disambiguation &
linking [ESWC13]
Topic profile extraction
[WWW13, ESCW14]
db:Astronomy
db:Astro. Objects
LinkedUp
Dataset Catalog
yov:Video
po:Programme
BBC Programme
<po:Programme …>
<po:Series>Wonders of the Solar System</.>
<po:Actor>Brian Cox</…>
</po:Programme…>
<yo:Video …>
<dc:title>Pluto & the
Dwarf Planets</dc:title>
…
</yo:Video…>
Yovisto Video
bibo:Fil
bibo:Fi
bibo:Film
Schema mappings
[WebSci13]

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 & mappings
 Live information about endpoint
accessibility
 Federated queries using type mappings
http://datahub.io/group/linked-education

Dataset profiling: exploring LOD datasets/topics
in a nutshell http://data-observatory.org/lod-profiles/
 Automatic extraction of dataset “topics” [ESWC2014]
 Visualisation & exploration of dataset-topic graph
(datasets, topics, relationships)
 Includes all (responsive) datasets of LOD Cloud

http://data-observatory.org/led-explorer/
 Type specific views on datasets/
categories
 “Document” (foaf:document)
 “Person “ (foaf:person)
 “Course” (aaiso:course)
 Currently applied to datasets in
LinkedUp Catalog only (as
schema mappings already
available here)
Type-specific exploration of dataset categories

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)
http://linkedup-challenge.org

 Open & focused track(s)
 Final events at ESWC2014
(May, Crete)
 Open Track only
 Final events at OKCon 2013
(September 2013, Geneva)
 Open track & focused tracks
 Submission details and calls to be
released soon
 Final events at ISWC2014
(October, Riva del Garda, Italy)
May –September 2013 October 2013 – May 2014 May 2014 – October 2014
?

Veni shortlist & winners
DataConf.
KnowNodes
Mismuseos
ReCredible
YourHistory
03/04/14
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

1st Place: PoliMedia
Exploring political debates & events
09/04/13Stefan Dietze
 Exploration of political debates and news
coverage
 Automatically generated links between transcripts
debates, newspaper articles,
 Generated data available as Linked Data
(http://data.polimedia.nl)
 Data sources: 1) newspapers in their original layout
of the historical newspaper archive, and 2) radio
bulletins of the Dutch National Press Agency (ANP)
 9000+ debates (1945 – 1995)
 Over 3000 media links
Martijn Kleppe, Max Kemman, Henri Beunders (Erasmus Universiteit
Rotterdam), Laura Hollink Damir Juric (Vrije Universiteit Amsterdam), Johan
Oomen Jaap Blom (Nederlands Instituut voor Beeld en Geluid)
http://www.polimedia.nl/

2nd Place: GlobeTown
Open data for sustainable development
09/04/13Stefan Dietze
 Exploring interaction between data about
environment, economy and society
(cause and effect in complex systems)
 Diverse open government data:
 SWERA renewable energy data:
http://swera.unep.net/,
 UN Comtrade trade data:
http://comtrade.un.org/,
 Country names and codes:
http://opengeocode.org,
 OECD statistics: http://stats.oecd.org/,
 World Bank:
http://data.worldbank.org
 Top three at Apps4Climate competition,
held by the World Bank
Jack Townsend, Andrea Prieto-Vega, Richard Gomer, Will Fyson, Dom
Hobson, Huw Fryer (University of Southampton, UK)
http://www.globe-town.org/

3rd Place/Peoples Choice: WeShare
Exploring, annotating, rating educational ICT tools
 Social & semantic annotation
application for educational ICT
tools
 Aids educators to find tools to
support teaching at all educational
levels
 Gathers and enriches data from
existing registries and datasets
 Currently: approx. 7000 tool
descriptions
 Crowdsourcing: educators, tutors
etc can modify and enrich data
Adolfo Ruiz-Calleja, Guillermo Vega-Gorgojo, Juan I. Asensio-Pérez, Eduardo
Gómez-Sánchez, Miguel L. Bote-Lorenzo, Carlos Alario-Hoyos
Universidad de Valladolid, Universidad Carlos III de Madrid, Valladolid, Spain
http://seek.cloud.gsic.tel.uva.es/weshare/

data.l3s.de – a DataHub for the L3S

Learning Analytics & Knowledge Data & Challenge
Facilitating Research on Learning Analytics and EDM
a nutshell
http://lak.linkededucation.org/
LAK Dataset (450 publications in RDF/R)
 ACM International Conference on Learning Analytics and
Knowledge (LAK) (2011-13)
 International Conference on Educational Data Mining (2008-13)
 Journal of Educational Data Mining (2008-12)
LAK Data Challenge
 Analyse, explore correlate the LAK Dataset
 At ACM LAK 2014 (April 2014, Indianapolis)

 Linked Data as enabler for educational resources
sharing
 Interpretation of user & resource (meta)data
 Understanding of learning contexts
 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)
 Challenges
 Noise & diversity
 Gap between technical community and end users
/educators/learners
 LinkedUp: technology transfer events, exploitation
workshops etc
 EUCLID
Conclusions – “Lessons Learned”

Outlook: some events & resources
03/04/14 55Stefan Dietze
 LinkedUp Challenge
(http://www.linkedup-challenge.org)
 Vidi events at ESWC2014, Vici calls coming soon
 Learning Analytics & Knowledge Dataset
(http://lak.linkededucation.org)
 + associated annual challenge
 PROFILES workshop @ ESWC2014
(http://keystone-cost.eu/profiles2014)
 26 May, Crete, Greece
 Linking User Data 2014 at UMAP2014
(http://liud.linkededucation.org)
 Deadline: 1 April
 LinkedUp Vici Workshop @ ESWC
 26 May, Crete, Greece

Thank you!
WWW
See also (general)
 http://linkedup-project.eu
 http://linkedup-challenge.org
 http://linkededucation.org
 http://data.l3s.de
 http://linkeduniversities.org
 http://purl.org/dietze
See also (data)
 http://datahub.io/group/linked-education
 http://data.linkededucation.org
 http://data.linkededucation.org/linkedup/catalog/
 http://lak.linkededucation.org
03/04/14 56Stefan Dietze

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