Presentation @#LAK13, Linked data challenge, Leuven, Belguim

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Socio-semantic Networks of Research
Publications in the Learning Analytics
Community
Soude Fazeli, PhD candidate
Dr. Hendrik Drachsler
Prof. Dr. Peter Sloep

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Agenda
1. Introduction
2. Motivation
3. Data processing
4. Network visualization
5. Discussion and conclusion

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1. Introduction
• Presenting visualization of the authors and papers network
• Carrying out a deeper analysis of the generated networks
• The main aim
• To use such a graph of authors and papers to recommend similar
items to a target user
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LAK 2011 LAK 2012 JETS2012
Papers
Authors

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2. Motivation
• A list of recommended authors and papers
• To plan the conference participation more efficiently and
effectively
• Awareness support for researchers (Reinhardt et al., 2012; Fisichella et al.,
2010; Ochoa et al., 2009; Henry et al., 2009)
• Scientific recommender systems (Huang et al., 2002; Wang & Blei, 2010)
• Such a priority list
• Support the awareness of the attendees
• Empower the network of like-minded authors in the attendees’
particular research focus

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• RQ1. How are the authors connected and which
authors share more connections and are more
central in terms of sharing commonalities with the
others?
• RQ2. How are the papers connected to each
other in terms of similarity?

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1. Finding patterns of similarity between authors and papers
2. Visualizing networks of the LAK authors and papers

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3. Data processing
3.1. Tag clouds
• The TF-IDF algorithm
• Weighted list of the most commonly used terms in research
articles
• Using default algorithm provided by Mahout on the text files
extracted from the RDF files
• Removing the stop words
• Setting the configuration variables within Mahout to 90%
• Outcome
• A so-called dictionary of all the terms in the LAK dataset
• A binary sequence file including the TF-IDF weighted vectors

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3. Data processing
3.2. Computing similarity
• Using T-index algorithm (Fazeli et al., 2010)
• Collaborative filtering recommender algorithm
• Generates a graph of users
• The nodes are users and the edges show the relationship between
users
• Originally makes recommendations based on the ratings data of users
• Extending the T-index algorithm
• Process tags and keywords extracted from the linked data
• Using Jena APIs to
• Process RDF files
• Handle Ontology Web Language (OWL) files describing the generated
graph of authors and papers

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4. Network visualization
4.1. Author network (made by Welkin)

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4. Network visualization
4.1. Author network
The degree centrality of the top ten central authors
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Then first ten central authors
indegree
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4. Network visualization
4.2. Paper network

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4. Network visualization
4.2. Paper network
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The degree centrality of Top ten papers

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• RQ1. How are the authors connected and which
authors share more connections and are more
central in terms of sharing commonalities with the
others?
• RQ2. How are the papers connected to each
other in terms of similarity?

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5. Discussion and conclusion
5.1. RQ1
The first ten central authors
Author Degree
Hendrik Drachsler 116
Kon Shing Kenneth Chung 87
Wolfgang Greller 80
Javier Melenchon 66
Brandon White 59
Vania Dimitrova 50
Erik Duval 45
Rebecca Ferguson 44
Anna Lea Dyckhoff 40
Simon Buckingham Shum 39

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• RQ1. How are the authors connected and which
authors share more connections and are more
central in terms of sharing commonalities with the
others?
• RQ2. How are the papers connected to each
other in terms of similarity?

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5. Discussion and conclusion
5.2. RQ2
Paper Authors
Learning Dispositions and Transferable
Competencies: Pedagogy, Modelling and
Learning Analytics
Simon Buckingham-Shum,
Ruth Deakin Crick
The Pulse of Learning Analytics
Understandings and Expectations from the
Stakeholders
Hendrik Drachsler,
Wolfgang Greller
Social Learning Analytics: Five Approaches Rebecca Ferguson,
Simon Buckingham-Shum
Multi-mediated Community Structure in a
Socio-Technical Network
Dan Suthers, Kar Hai Chu
Modelling Learning & Performance: A Social
Networks Perspective
Walter Christian Paredes,
Kon Shing Kenneth Chung
Teaching Analytics: A Clustering and
Triangulation Study of Digital Library User
Data
Beijie Xu,
Mimi M Recker
Monitoring Student Progress Through Their
Written "Point of Originality"
Johann Ari Larusson,
Brandon White
Learning Designs and Learning Analytics Lori Lockyer,
Shane Dawson
A Multidimensional Analysis Tool for
Visualizing Online Interactions
Eunchul Lee,
M'hammed Abdous
Using computational methods to discover
student science conceptions in interview data
Bruce Sherin
The top ten central papers

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5. Discussion and conclusion
• The central authors and top ten papers will appear
more often in the top recommendation list
• Although most of the central authors also appear in
top ten papers’ list, the order is not the same
• Some authors has more than one paper
• Not each and every one of the authors’ papers
individually has the highest similarity to the other
papers

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Soude Fazeli
PhD candidate
Open University of the Netherlands
Centre for Learning Sciences and Technologies
(CELSTEC) PO-Box 2960
6401 DL Heerlen, The Netherlands
email: soude.fazeli@ou.nl