2015 03 19 (educon2015) emadrid uned towards learning resources rankings in moocs: a pairwise based...
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Towards learning resources rankings in MOOCs: A Pairwise based Reputation
Mechanism
R. Centeno, M. Rodríguez-Artacho, Félix García, Elio Sancristóbal, Gabriel Díaz, Manuel Castro
[email protected] University, Spain
Content
• Reputation
• Integrating remote laboratories in MOOCs
• Evaluating MOOC content
• A Pairwise reputation mechanism for MOOCs
• Conclusions
IEEE EDUCON 2015, Tallinn
Reputation
• many types: professional links, friendships, purchases, ...• complex: dynamism, complexity of the social structure, many
nodes (users, entities, ..)• interaction results are unpredictable (which seller to select,
which hotel to book, …)• how can we predict future behaviours?
3
Complex Social Networks Reputation
IEEE EDUCON 2015, Tallinn
Reputation mechanisms in social networks
IEEE EDUCON 2015, Tallinn
objective: extract reputation of entities (users, objects, …)
how: gathering and aggregating opinions
Examples:
Reputation mechanisms in social networks
IEEE EDUCON 2015, Tallinn
objective: extract reputation of entities (users, objects, …)
how: gathering and aggregating opinions
Examples:
Reputation mechanisms in social networks
Qualitative vs.Quantitative “Experts” vs. Users
Unbalanced source text oppinion vs. Numerical rating
Lack of accuracy numerical ratings
IEEE EDUCON 2015, Tallinn
MOOC Example DIEEC UNEDIntegrating remote laboratories in MOOCs
◌ Module 1: Simulator.
◌ Module 2: VISIR.
◌ Module 3: Working with resistors. Ohmic values. Voltage divider.
◌ Module 4: RLC circuits. RL, RLC & RC circuits.
◌ Module 5: Working with diodes. Differences between 1N4007 & BAT42.
Halfwave rectifier. Voltage drop on diode.
◌ Module 6: Low-pass filter. Mean value, voltage ripple, load regulation
and line regulation.
◌ Module 7: Zener diode. Zener diode as voltage regulator. Zener diode as
clipper. Construction of the current-voltage characteristic curve.
◌ Module 8: Operational amplifier. Non-inverting amplifier. Inverting
differentiator. Inverting amplifier
IEEE EDUCON 2015, Tallinn
MOOC Example DIEEC UNED
Organization Access to experiments is provided by the
MOOC’s portal through an integrated scheduling/booking system
The initial settings allow 16 simultaneous users per 60 minutes slot and for each user a maximum of two simultaneous slots booked and a limitation of 14 slots per course
With these settings, VISIR allows up to 384 students to experiment with any of the designed practices of the MOOC
Cuantitative vs. Comparative reviews
Easier for users to state opinions when thequery compare objects in a pairwise fashion
Ben-Hur 9
Casablanca 7.4
Gone with the wind 8.2
IEEE EDUCON 2015, Tallinn
Cuantitative vs. Comparative reviews
• Potential problems of numerical oppinion
– Passive wait for users to grade
– Influenciable and manipulable viral ratings
• Reputation based on comparative reviewsPairwise reputation mechanism (PWRM)
IEEE EDUCON 2015, Tallinn
MOOC formalization
M = {U,R,LR,LU} is a MOOC where:
U = {u1,..,un} users (students AND teachers)
R = {r1,..,rj} learning resources
LR = { <ui,rj> / ui € U; rj € R } user ui has uploadedresource rj
LU = { <uk,rm> / uk € U; rm € R } user uk has usedresource rm
IEEE EDUCON 2015, Tallinn
MOOC formalization
• Live envorinment in term of resources
• Objective build ranking of resources withinthe MOOC
• Asumption: Users have set of resources’ preferences on a subset
• Let O set of oppinions where oi=<ri,rj> representing a pairwise query
R 'Í R
IEEE EDUCON 2015, Tallinn
Conclusions
• Reputation mechanism to be applied within MOOCs
• Massive implies accuracy, but resources are often notprovided by many users
• Clustering criteria Selection process
According to typology (Multimedia, video, audio, …)
According to metadata (Pedagogical objectives, granularity, etc. )
IEEE EDUCON 2015, Tallinn
Towards learning resources rankings in MOOCs: A Pairwise based Reputation
Mechanism
R. Centeno, M. Rodríguez-Artacho, Félix García, Elio Sancristóbal, Gabriel Díaz, Manuel Castro
[email protected] University, Spain
Thanks!