social navigation in lecture recordings robert mertens [email protected]
TRANSCRIPT
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Lecture Recording in General1
1 according to the 4-phases-model in: Wolfgang Hürst, Rainer Müller, Thomas Ottmann: The AOF Method for Production, Use, and Management of Instructional Media Proceedings of ICCE2004: International Conference on Computers in Education, Melbourne, Australia, December 2004
Preparation Live-Talk and Recording Post-Processing Usage
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Workflow
Web-/ VideoServer
Generator
Real- Converter
Camera and MicrophonesMPEG-Recording
Stud.IP-Server
Presentation Computer
Real- Video
Powerpoint-Presentation,
Metadata
Start/Stop Recording
Presentation
Link to the recording
MPEG2-Video
Contact LMS
Configuration +
MPEG-Computer-IP Lecture HallComputing Center
Upload
Upload
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Hypermedia Navigation
• Fulltext-Search
• Footprints
• Bookmarks
• Structural elements
• Backtracking
Combined
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Hypermedia Interface
• Fulltext-Search• Footprints• Bookmarks• Structural elements• Backtracking
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Structural Elements
Slide 1• Item 1
• Punkt 2
Slide 1• Item 1
• Item 2
Slide 2• Item 1
Slide 1• Punkt 1
• Punkt 2
Slide 1• Item 1
• Item 2
Slide 2• Item 1
Slide 2• Item 1
Slide 2• Item1
Slide 2• Item 1
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Interface Implementation I - SVG and JavaScript
• animations in SVG are start-and-forget (text-search and footprint-bar)
• SVG can be modified on display and saved on the server
• SVG represents its contents symbolically
• Interaction between SVG and JavaScript
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Interface Implementation II – storing interaction data
• old version and offline-medium save interaction data in cookies
• new version uses a mysql database
• Login required (easier way: cookies with login or integration with LMS)
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Why social navigation in lecture Recordings ?
• Social navigation offers a user-defined, alternative structure for search and exploration.
• Can use other people’s search history [Ahn, Brusilovsky & Farzan 2005].
• TSR (Time Spent Reading) [Farzan & Brusilovsky 2005] as an unobtrusive measurement (more accurate with lecture recordings).
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Where to add Social Navigation? (Levels)
• Courses (I)– Integration into other system
• Sessions (II)– Integration into other system (see [Hürst 2003] for
issues regarding search engines for lecture recordings)
• Sequences of slides (III)– Integration into other system (again: [Hürst 2003])
(Externalized Bookmarks)
• Arbitrary intervals of a session (IV)– Visualization in the interface
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Different Application Scenarios
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First Concept for Level IV Integration
• Analyze viewing time
• Categorization by week of session
• Letting it work on bookmarks, too?
• Problem: Time vs. structure
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Time and Structure
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Visualization
number of views
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Discussion
Thank you for your attention
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Literature• [Ahn, Brusilovsky & Farzan 2005] Ahn, J., Brusilovsky, P., and
Farzan, R: Investigating Users Needs and Behavior for Social Search. In: Brusilovsky, P., Callaway, C. and Nürnberger, A. (eds.) Proc. of Workshop on New Technologies for Personalized Information Access at 10th International User Modeling Conference, UM 2005, (Edinburgh, July 24-25, 2005), 1-12
• [Farzan & Brusilovsky 2005] Farzan, R. and Brusilovsky, P: Social navigation support in E-Learning: What are real footprints. In: Anand, S.S. and Mobasher, B. (eds.) Proc. of IJCAI'05 Workshop on Intelligent Techniques for Web Personalization, (Edinburgh, U.K., August 1, 2005), 49-56
• [Hürst 2003] Hürst, W.: Indexing, Searching, and Skimming of Multimedia Documents Containing Recorded Lectures and Live Presentations. Extended abstract of a demonstration at ACM Multimedia 2003, Berkeley, CA, USA, November 2003.