June 12, 2008 The University of Mississippi Design Strategy for Knowledge Base Formation to Automate...
12
June 12, 2008 The University of Mississippi Design Strategy for Knowledge Base Formation to Automate a Course Map Creation Susan Lukose [email protected]
-
Upload
hilary-mcdowell -
Category
Documents
-
view
213 -
download
0
Transcript of June 12, 2008 The University of Mississippi Design Strategy for Knowledge Base Formation to Automate...
June 12, 2008 The University of Mississippi
Design Strategy for Knowledge Base Formation
to Automate a Course Map Creation
Susan Lukose
June 12, 2008
The University of Mississippi
Presentation Outline
• Background
• Issues
• Motivation
• Existing Methods
• Our Approach
• Evaluation
June 12, 2008
The University of Mississippi
Background
• Formal Learning - traditional classroom learning• Non Formal Learning - online learning
• The Institute of Advanced Education in Geospatial Sciences ( IAEGS )– NASA funded project
– Organization and structure of courses
– Virtual Portal Application, Knowledge Delivery Engine and various supporting tools
– 25 online courses
June 12, 2008
The University of Mississippi
Background• Procedure to create a course involves:
– Domain experts
– Selection of concepts and their structure to form the course and
creation of the content material
– Course map (Detailed outline of a course)
– Peer review by other domain experts
– Create course content which includes text, images, videos,
question and exercises
– Professional animators create these animations
– Peer reviewed to ensure desired quality of the material
June 12, 2008
The University of Mississippi
Snap-Short of a Course Map
June 12, 2008
The University of Mississippi
Issues
• Requires extensive domain specific knowledge
• Expensive in terms time and money
– Casey and McAlpine (Casey et al. 2002), state that,
“Anyone who has had to create learning materials from scratch
knows just how labor intensive and time consuming the process
can be”
• 1 to 2 months for course map creation
• 6 to 8 months for entire course creation
• No direct interaction of students and teachers
June 12, 2008
The University of Mississippi
Motivation
• Reduce course creation time
• Option of customizing the course
June 12, 2008
The University of Mississippi
Existing Methods
• No existing research to reduce course creation time.– Digital libraries are available– How to reuse these resources for course creation?
• Customizing courses– Dicheva et al.2004, Cardinaels et al. 2005, Kotzinos et al. 2005,
Tane et al. 2004, Mittal et al. 2006– Create alternate learning path– But no automatic method to create alternate paths
• Ontology approach used in Semantic Web – Li et al. 2000, Cimiano et al. 2005, Wang et al. 2006, Bisson et
al. 2000, Cimiano et al. 2005– Ontology is created either manually or from document corpus
June 12, 2008
The University of Mississippi
Approach
• Use ontology (hierarchical structure of concepts and their relationships)
• Ontology is created from glossaries instead of documents
June 12, 2008
The University of Mississippi
Approach
Concept Relationship identifier & Ranker
Glossary & Course Documents
Concepts & Weights
Concept Identifier & Ranker
Weighted Directed Graph
WeightedUndirected Graph
Super-ordinate, Sub-ordinate, Equivalence Relationships & Weights
Associative, Co-occurrence Relationships & Weights
Transitive Reducer
Acyclic Graph Generator
Weighted Ontology
Weighted Ontology
Knowledge BaseGlossaryDomain Documents
1. Document Frequency
2. Glossary Frequency
3. Hit ratio
1. Super-ordinate
2. Sub-ordinate
3. Associative
4. Equivalence
5. Co-occurrence
June 12, 2008
The University of Mississippi
Evaluation
• A case study was conducted with IAEGS• “Photogrammetry and Remote Sensing” domain was used• Glossaries used are:
– ASPRS– CCRS– LDEO
• Ontology created consist of:– 11,500 concepts– 18,500 relations– Forest and is very sparse
• Evaluated using precision and recall measure
June 12, 2008
The University of Mississippi
Thank You
