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Andreea Molnar, Cristina Hava Muntean
School of ComputingNational College of [email protected],
QoE-MOT – A Learner Quality of Experience-
Oriented Authoring Tool
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Overview
Adaptive e-Learning Systems (AeLS)Multimedia Content IssuesAuthoring AeLSQuality of Experience LOAS (QoE-LAOS)
FrameworkQuality of Experience MOT (QoE-MOT)
Authoring ToolConclusions & Future Work
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Adaptive e-Learning Systems
Adaptive e-Learning Systems
The main goal is to provide personalised educational content tailored to learner’s profiles
Adaptation is based on:Learner profileLearner deviceLeaner contextLearner network
performance, etc
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Multimedia Content Issues (1)
Increasing useof multimedia in e-learning courses
Not all people perceive multimedia quality in the same way
Educational material, especially video, is affected by poor QoS (Quality of Service):Unclear voiceUnclear imageSynchronisation problems between voice and
videoDelay in accessing the educational content
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Multimedia Content Issues (2)
Is there a solution?Take into account the characteristics of
the multimedia educational content as well as
network and learner device in the course design and adaptation rules specification
phases.
An authoring tool which would help the course creators to create this kind of
course.
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Authoring AeLS
Type of authoring toolsdo not support content adaptation:
HyCo –a simple and intuitive interface for generating learning content
MEAT – it allows single authoring for modal interfaces
support content adaptation:MOT (My Online Teacher) – a general
authoring systemA-SCORM Course Creator Tool – creates
adaptive SCORM conformant courses
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QoE-LAOS FrameworkAn extension of LOAS authoring model that
has 5 layers:Domain Model (DM)User Model (UM)Goal and Constraints Model (GM)Adaptation Model (AM)Presentation Model (PM)
Adds three new sub-layers QoE Content Features sublayerQoE Characteristics sublayerQoE Rules sublayer
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QoE-MOT (Quality of Experience-MOT)
QoE-MOT is based on the generic authoring tool: MOT
Support for creation of performance-aware adaptive courses
It follows the QoE-LAOS authoring model
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QoE-MOT: Content Features (1)
Stores various versions with different properties for each file
File characteristics metadata are also keptText: size, length, format (e.g. plain text)Image: size, format (e.g. jpg), resolutionWebpage: size, no. of objects embedded in a
fileVideo: bit rate, frame rate, resolution,
encoding scheme
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QoE Content Features (2)QoE-MOT Exemplification
New metadata for the
multimedia version 1 file
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QoE-MOT: QoE Rules (1)
Defines adaptation rules based on the QoE characteristics
Different strategies can be introduced at this level, providing the author with the possibility to choose between them
The rules are written using LAG adaptation language
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QoE-MOT: QoE Rules (2)Exemplification:
if enough (DM.Concept.access DM.Concept.type == bitrate ,2)then (if DM.Concept.bitrate <=maxbitrate t hen UM.GM.suitable = true else UM.GM.suitable = false)
if enough (DM.Concept.access UM.GM.suitable == true ,2)then PM.GM.Concept.show = true
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Conclusions
Multimedia content can be damaged by the network condition
QoE-MOT an authoring tool for the AeLS was presented
QoE-MOT is based on the QoE-LAOS authoring model
It extends MOT with new features that allow QoE aware rules adaptation authoring
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Future work
To automate the process of content metadata extraction
Reusable adaptation strategies for authoring the content have been proposed and will be further tested
Subjective tests will be performed to evaluate QoE-MOT
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Questions?