Wireless and Mobile Access to Digital Libraries

1
Wireless and Mobile Access to Digital Libraries

• Sang-goo Lee
• School of Computer Science and Engineering
• Seoul National University
• Seoul, Korea

2
Worldwide Market

• Year 2000 to year 2007
• subscribers 530 million to 1,370 million
• service revenue 295 billion to 521 billion
• Better technologies
• 3G services by 2003 (Europe and Asia)
• Protocols (eg, WAP) to include graphics and
  animations
• Intelligent and powerful mobile devices

3
Korean Market

• One of the fastest growing markets
• Early adapters of new technologies
• Lifestyles that demand ubiquitos/ untethered
  communications

4
A typical day of Youngsoo

• 700 Wake up
• 800 Leave home
• 810 Get on bus
• 820 Transfer to subway
• 850 - 1400 3 classes, lunch, and pools
• 1415 Get on subway
• 1430 Transfer to another line
• 1450 ESL class

• 1645 Get on bus
• 1700 Math Tutoring
• 1900 Get on bus
• 1935 Dinner and Karaoke with girlfriend
• 2130 Get on bus/subway
• 2205 Back home

160 minutes (240) on the road!
5
Korea-US Collaboration
Korean Companies
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HANUL

• A mediator-based DL system
• Integrate distributed information sources to
  create one single virtual library for the user
• Query Recycling
• Virtual Index Manager
• Result Set Manager
• Result Cache Manager

7
Evolving Hierarchical Topic Structure

• Semi-supervised clustering of documents
• Hierarchy reorganization/ restructuring operations

Ca
Cb
Cc
Cd
Ce
Semi-supervised clustering
Clustering area
Fuzzy concept subsumption matrix
Sub-hierarchy
Cd
?0.8
Ca
Cb
Ce
Cc
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CatalogStop

• A digital catalog library system for catalog
  sharing and standardization
• Extended Catalog Model
• Catalogs
• the hierarchy

9
PDA Data Management

• An embedded DB engine for PDA (JTELs CellVic)
• main memory database management
• support for PDA-specific functions
• small footprint
• sync management

10
Gestational Diabetes

• Anytime, anywhere telemedicine
• Diabetes pregnancy gt close monitoring

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Query by Taxonomy

• Query/navigational characteristics of mobile
  interaction
• Personalized and evolving taxonomy

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Summary

• Wireless access to digital library is important
• QBT and other relevant problems/ issues are
  interesting
• Ideal area for Korea-US collaboration