Wireless and Mobile Access to Digital Libraries

Wireless and Mobile Access to Wireless and Mobile Access to Digital LibrariesDigital Libraries

Sang-goo Lee

School of Computer Science and Engineering

Seoul National University

Seoul, Korea

Worldwide MarketWorldwide 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 an

d animations– Intelligent and powerful mobile devices

Korean MarketKorean Market

One of the fastest growing marketsEarly adapters of new technologiesLifestyles that demand ubiquitos/ unteth

ered communications

A typical day of YoungsooA typical day of Youngsoo

7:00 Wake up 8:00 Leave home 8:10 Get on bus 8:20 Transfer to subway 8:50 - 14:00 3 classes,

lunch, and pools 14:15 Get on subway 14:30 Transfer to

another line 14:50 ESL class

16:45 Get on bus 17:00 Math Tutoring 19:00 Get on bus 19:35 Dinner and

Karaoke with girlfriend 21:30 Get on

bus/subway 22:05 Back home

160 minutes (2:40) on the road!

Korea-US CollaborationKorea-US Collaboration

US Universities

Korean Universities

Research & Publications

Technology Transfer

Pilot Applications

Commercial DeploymentKorean Companies

HANULHANUL

A mediator-based DL system– Integrate distributed information sources to

create one single virtual library for the userQuery Recycling

– Virtual Index Manager– Result Set Manager– Result Cache Manager

Evolving Hierarchical Topic Evolving Hierarchical Topic StructureStructureSemi-supervised

clustering of documents

Hierarchy reorganization/ restructuring operations

Clustering area

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Fuzzy concept subsumption matrix

Semi-supervisedclustering

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Sub-hierarchy

CatalogStopCatalogStop

A digital catalog library system for catalog sharing and standardization

Extended Catalog Model– Catalogs – the hierarchy

MallMall MallMall

Central RepositoryServer

Central RepositoryServer DCDC

ManufacturerManufacturer ManufacturerManufacturer

EndPurchaser

EndPurchaser

EndPurchaser

EndPurchaser

ManufacturerCatalog

ManufacturerCatalog

CatalogObjectServer

CatalogObjectServer

ManufacturerCatalog

ManufacturerCatalog

PDA Data ManagementPDA Data Management

An embedded DB engine for PDA (JTEL’s CellVic)– main memory database management– support for PDA-specific functions– small footprint– sync management

Gestational DiabetesGestational Diabetes

Anytime, anywhere telemedicine

Diabetes + pregnancy => close monitoring

Query by TaxonomyQuery by Taxonomy

Query/navigational characteristics of mobile interaction

Personalized and evolving taxonomy

SummarySummary

Wireless access to digital library is important

QBT and other relevant problems/ issues are interesting

Ideal area for Korea-US collaboration