a model based on semantic nets to support evolutionary and adaptive hypermedia systems
DESCRIPTION
Laboratorio de Investigación en Videojuegos y E-Learning. GEDES - UGR. A Model Based on Semantic Nets to Support Evolutionary and Adaptive Hypermedia Systems. N. Padilla Zea M. Medina Medina M. J. Cabrera F. Molina Ortiz L. García Cabrera. Summary. Introduction SEM-HP Results - PowerPoint PPT PresentationTRANSCRIPT
A Model Based on Semantic Nets to Support Evolutionary and
Adaptive Hypermedia Systems
N. Padilla ZeaM. Medina Medina
M. J. CabreraF. Molina Ortiz
L. García CabreraGEDES - UGR
Laboratorio de Investigaciónen Videojuegos y E-Learning
Summary
• Introduction
• SEM-HP
• Results
• Conclusions and further work
Laboratorio de Investigación en Videojuegos y E-Learning
Introduction
AHS (Student perspective)
Laboratorio de Investigación en Videojuegos y E-Learning
Associative retrieval of information
Diversity of formats
Several ways to access information
Adjust to user’s needs
Reduce desorientation
Reduce knowledge overloading
Changes not on user’s demand
Force to read prerrequisites
Users should have control over when and how adapt
Allow different types of navigation
Introduction
AHS (Author perspective)
Laboratorio de Investigación en Videojuegos y E-Learning
Building more complex than non-adaptive systems
Provide author tools
Life cycle is not given importance enough
Provide mechanisms to make changes easier and consistent
SEM-HP
(SEMantic, Systemic and Evolutionary model to develop HyPermedia Systems)
SEM-HP
Laboratorio de Investigación en Videojuegos y E-Learning
• Design and development based on a cognitive model
• Development, maintenance and navigation easier and flexible
• Design in four phases to separate domain modelling, presentation, navigation and adaptation
Three elements to develop AHS
-Development process
- Architecture
- Author tool
AHS
Authortool
Arquitecture
Development process
SEM-HP
Laboratorio de Investigación en Videojuegos y E-Learning
Divide-and-conquer strategy
Guidelines regarding Soft. Eng.
Four phases:1.Memorization2.Presentation3.Navigation4.Learning
SEM-HP
Laboratorio de Investigación en Videojuegos y E-Learning
AHS
Authortool
Arquitecture
Development process
• The author specifies:
– Information domain
• Set of items associated to concepts in the concept domain
– Underlying conceptual domain
• To make semantic relations explicit
• Concepts to classify information items
• Concept: Idea, though or abstraction
Memorization phase(building conceptual
and information domain)
Presentation phase(subdomains)
Navigation phase(ordering
information)
Learning phase(What, who, how and
when adapt?)
Development of a AHS
SEM-HP
Laboratorio de Investigación en Videojuegos y E-Learning
AHS
Authortool
Arquitecture
Development process
The author selects different
presentations or views of the
knowledge domain obtained in
the memorization phaseMemorization phase(building conceptual
and information domain)
Presentation phase(subdomains)
Navigation phase(ordering
information)
Learning phase(What, who, how and
when adapt?)
Development of a AHS
SEM-HP
Laboratorio de Investigación en Videojuegos y E-Learning
AHS
Authortool
Arquitecture
Development process
The author establishes how the
user can navigate the
available information items
Memorization phase(building conceptual
and information domain)
Presentation phase(subdomains)
Navigation phase(ordering
information)
Learning phase(What, who, how and
when adapt?)
Development of a AHS
SEM-HP
Laboratorio de Investigación en Videojuegos y E-Learning
AHS
Authortool
Arquitecture
Development process
Question about adaptation:
What, who, how and when to
adapt
The author established
mechanism to allow system to
adjust to user’s characteristics
and interests
Memorization phase(building conceptual
and information domain)
Presentation phase(subdomains)
Navigation phase(ordering
information)
Learning phase(What, who, how and
when adapt?)
Development of a AHS
SEM-HP
Laboratorio de Investigación en Videojuegos y E-Learning
AHS
Authortool
Arquitecture
Development process
These phases are iterative
Evolutionary development
because phases are able to
integrate changesMemorization phase(building conceptual
and information domain)
Presentation phase(subdomains)
Navigation phase(ordering
information)
Learning phase(What, who, how and
when adapt?)
Development of a AHS
SEM-HP
Laboratorio de Investigación en Videojuegos y E-Learning
AHS
Authortool
Arquitecture
Development process
• Vertical division– 4 related subsystems
• Horizontal division– 2 layers for each subsystem
• System: Representation models designed
during each development phase
• Meta-system: Evolutionary mechanisms to
integrate and propagate changes
– Evolutionary actions
– Restrictions
– Change propagation
SEM-HP
Laboratorio de Investigación en Videojuegos y E-Learning
AHS
Authortool
Arquitecture
Development process
Action 1Action 2...
Action nSystem restrictions?
Author restrictions?
To build and modify the HS…
OK. I have finished
Changes in other elements are needed? (Internal propagarion)
Changes in other sybsystems are needed? (External
propagarion)
SEM-HP
Laboratorio de Investigación en Videojuegos y E-Learning
AHS
Authortool
Arquitecture
Development process
• Stores, structures and maintains conceptual and informational domain
• Catalogues information item on the underlying conceptual domain
• The representation model is a conceptual structure
– Semantic net
– 2 types of nodes semantically tagged (concepts and information item)
– Formal definition CS=(C, I, Rc, Rf, Ac, Af)
Let’s talk about vertical division…
C: Concepts Rf: Functional Relations
I: Items Ac: Conceptual Associations
Rc: Conceptual Relations
Af: functional Relations
SEM-HP
Laboratorio de Investigación en Videojuegos y E-Learning
AHS
Authortool
Arquitecture
Development process
CS=(C, I, Rc, Rf, Ac, Af)
Rc (Conceptual Relation)
rcRc is the tag placed in
the arc joining coC and
cdC
Ac (Conceptual
Association)
acAc is composed by 2
concepts and a rc that
exists between them
Rf (Functional Relation)
rfRf tags a link between
ijI and ckC.
Denotes the role that ij
performs regarding ck
Af (Functional Association)
afRf is composed by a
concept, an item and a
rfRf that exist between
them
SEM-HP
Laboratorio de Investigación en Videojuegos y E-Learning
AHS
Authortool
Arquitecture
Development process
Each presentation of the conceptual and informational domain is a Conceptual Structure of Presentation
Each presentation updates modifications performed in the Memorization Subsystem
SEM-HP
Laboratorio de Investigación en Videojuegos y E-Learning
AHS
Authortool
Arquitecture
Development process
Define rules Ro to navigate based on:
– Last item accessed– Concept associated to this item– Concepts available from this one
When a concept or item is deleted the meta-system propagates the change Deletes rules or predicates in rules
SEM-HP
Laboratorio de Investigación en Videojuegos y E-Learning
AHS
Authortool
Arquitecture
Development process
Models the user and adapts the system to his characteristics.
Information at User model:• Personal data• Knowledge state• Experience on subject• Navigation experience• Preferences• Interests• Goals
SEM-HP
Laboratorio de Investigación en Videojuegos y E-Learning
AHS
Authortool
Arquitecture
Development process
MEMORIZATION
SEM-HP
Laboratorio de Investigación en Videojuegos y E-Learning
AHS
Authortool
Arquitecture
Development process
PRESENTATION
SEM-HP
Laboratorio de Investigación en Videojuegos y E-Learning
AHS
Authortool
Arquitecture
Development process
LEARNING
Results
Laboratorio de Investigación en Videojuegos y E-Learning
• 31 students
• Knowledge domain: Object Oriented Programmation
• JSEM-HP to build the HS
• Positive evaluation in 35 aspects
• Test by an opinion questionnaire
Results
Laboratorio de Investigación en Videojuegos y E-Learning
Usefulness of graphic browser of JSEM-HP (in the SEM-HP model the navigation is performed on the semantic net itself)
4.29/ 5
Usefulness of navigation on a partial view of the graph (the SEM-HP model provides the user with a different presentation depending on the knowledge subdomain in which the user is more interested)
4.06 / 5
Adaptation 4.16 / 5
Efficiency of finding information through the browser on JSEM-HP against seeking information on the Web
3.8 / 5
Some results
Conclusions and further work
Laboratorio de Investigación en Videojuegos y E-Learning
• SEM-HP is a semantic, systemic and evolutionary model to develop hypermedia systems
• Provides the author a systematic development process, a layered architecture and an author tool
Conclusions and further work
Laboratorio de Investigación en Videojuegos y E-Learning
• The architecture is divide in 4 subsystems and has 2 abstraction levels to perform automatic evolution
• The navigation structure allows student to check their knowledge degree
• Finishing JSEM-HP to carry our wider assessments from students and author perspective
A Model Based on Semantic Nets to Support Evolutionary and
Adaptive Hypermedia Systems
N. Padilla ZeaM. Medina Medina
M. J. CabreraF. Molina Ortiz
L. García CabreraGEDES - UGR
Laboratorio de Investigaciónen Videojuegos y E-Learning
THANK YOU!