A Model Based on Semantic Nets to Support Evolutionary and Adaptive Hypermedia Systems

1. 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

2. Summary • Introduction • SEM-HP • Results • Conclusions and further work Laboratorio de Investigación en Videojuegos y E-Learning

3. Introduction AHS (Student perspective) Associativeretrieval of information Changesnotonuser’sdemand Diversity of formats Users should have control over when and how adapt Severalwaystoaccessinformation Adjusttouser’sneeds Forcetoreadprerrequisites Reduce desorientation Allow different types of navigation Reduce knowledgeoverloading Laboratorio de Investigación en Videojuegos y E-Learning

4. Introduction AHS (Author perspective) Building more complexthan non-adaptivesystems Provide author tools Provide mechanisms to make changes easier and consistent Lifecycleisnotgivenimportanceenough SEM-HP (SEMantic, Systemic and Evolutionary model to develop HyPermedia Systems) Laboratorio de Investigación en Videojuegos y E-Learning

5. SEM-HP • 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 Laboratorio de Investigación en Videojuegos y E-Learning

6. SEM-HP Divide-and-conquer strategy Guidelines regarding Soft. Eng. • Three elements to develop AHS • Development process • Architecture • Author tool Four phases: Memorization Presentation Navigation Learning Laboratorio de Investigación en Videojuegos y E-Learning

7. SEM-HP • 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 Laboratorio de Investigación en Videojuegos y E-Learning

8. SEM-HP The author selects different presentations or views of the knowledge domain obtained in the memorization phase Laboratorio de Investigación en Videojuegos y E-Learning

9. SEM-HP The author establishes how the user can navigate the available information items Laboratorio de Investigación en Videojuegos y E-Learning

10. SEM-HP 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 Laboratorio de Investigación en Videojuegos y E-Learning

11. SEM-HP These phases are iterative Evolutionary development because phases are able to integrate changes Laboratorio de Investigación en Videojuegos y E-Learning

12. SEM-HP • 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 Laboratorio de Investigación en Videojuegos y E-Learning

13. SEM-HP To build and modify the HS… Changes in otherelements are needed? (Internalpropagarion) Changes in othersybsystems are needed? (Externalpropagarion) OK. I have finished Action 1 Action 2 . . . Action n System restrictions? Author restrictions? Laboratorio de Investigación en Videojuegos y E-Learning

14. SEM-HP • 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… Laboratorio de Investigación en Videojuegos y E-Learning

15. SEM-HP CS=(C, I, Rc, Rf, Ac, Af) Rc (Conceptual Relation) rcRc is the tag placed in the arc joining coC and cdC Ac (Conceptual Association) acAc is composed by 2 concepts and a rc that exists between them Rf (Functional Relation) rfRf tags a link between ijI and ckC. Denotes the role that ij performs regarding ck Af (Functional Association) afRf is composed by a concept, an item and a rfRf that exist between them Laboratorio de Investigación en Videojuegos y E-Learning

16. SEM-HP Each presentation of the conceptual and informational domain is a Conceptual Structure of Presentation Each presentation updates modifications performed in the Memorization Subsystem Laboratorio de Investigación en Videojuegos y E-Learning

17. SEM-HP 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 Laboratorio de Investigación en Videojuegos y E-Learning

18. SEM-HP 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 Laboratorio de Investigación en Videojuegos y E-Learning

19. SEM-HP MEMORIZATION Laboratorio de Investigación en Videojuegos y E-Learning

20. SEM-HP PRESENTATION Laboratorio de Investigación en Videojuegos y E-Learning

21. SEM-HP LEARNING Laboratorio de Investigación en Videojuegos y E-Learning

22. Results • 31 students • Knowledge domain: Object Oriented Programmation • JSEM-HP to build the HS • Positive evaluation in 35 aspects • Test by an opinion questionnaire Laboratorio de Investigación en Videojuegos y E-Learning

23. Results Some results Laboratorio de Investigación en Videojuegos y E-Learning

24. Conclusions and further work • 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 Laboratorio de Investigación en Videojuegos y E-Learning

25. Conclusions and further work • 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 Laboratorio de Investigación en Videojuegos y E-Learning

26. Laboratorio de Investigación en Videojuegos y E-Learning GEDES - UGR A Model Based on Semantic Nets to Support Evolutionary and Adaptive Hypermedia Systems THANK YOU! N. Padilla Zea M. Medina Medina M. J. Cabrera F. Molina Ortiz L. García Cabrera