GPortal Digital Library Project: An Overview

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G-Portal Digital Library Project An Overview

• A/Prof Lim Ee Peng
• Centre for Advanced Information SystemsSchool of
  Computer EngineeringNanyang Technological
  University

Collaborators John Hedberg, Chew-Hung Chang,
Tiong-Sa Teh National Institute of
Education Dion Hoe-Lian Goh, Yin-Leng Theng
School of Communication and Information
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Acknowledgement

• Funding support from
• 300K from Ministry of Education (2003-2006)
• S315K from Agency for Science, Technology and
  Research (2001-2003)
• Ex-technical members
• Sun Aixin, Liu Zehua
• Current technical members
• Zong Wenbo, Wu Dan

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Outline

• G-Portal Basic Features
• G-Portal for Field Study
• G-Portal Other Research Topics

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G-Portal Basic Features
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G-Portal

• IdeaA digital library for managing metadata
  about geography related web objects and
  organizing them so as to provide support to
  collaborative learning activities.
• Raw Knowledge
• Web pages, images, photos, excel files with URLs
• Created/maintained by geography education
  community, local teachers and students
• Metadata Knowledge
• For analysis, query processing, knowledge
  organization
• Collaborative learning activities
• Accessible anywhere
• Flexible creation sharing of knowledge about
  web objects

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G-Portal Architecture
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G-Portal Components/Services

• Metadata Representation
• Metadata Organization
• Classification
• Query Processing
• Annotation
• Project Viewer

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Metadata Representation

• Raw learning objects web sites, web pages, image
  objects (map, photos, etc..), excel files, word
  files and others
• Metadata description of raw learning objects
• Metadata is also known as catalog records in the
  traditional library model

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Metadata Format

• Web objects are heterogeneous in nature
• Metadata schema to define the format of metadata
• Each metadata schema is for a different type of
  metadata
• The base schema define the basic attributes
• id, name, location, owner, link to raw resource,
  etc.
• All schemas are derived from the base schema to
  introduce new attributes

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Metadata Format
A USA County Resource
A Country Resource
lt?xml version"1.0" encoding"UTF-8"?gt
ltResource ShapeID"1"gt ltIDgtCountyQuickFacts_1
lt/IDgt ltResourceNamegt ltNamegtHarris
Countylt/Namegt lt/ResourceNamegt ltLocation
Type"Geometry"gt ... ... lt/Locationgt
ltCreatorgt ... ... lt/Creatorgt ltSourcegt ltLinkgt
http//... ... lt/Linkgt lt/Sourcegt ltContentgt
ltGeneralQuickFactsgt ltStategt
Georgia lt/Stategt lt/GeneralQuickFacts
gt ... ... ltPeopleQuickFactsgt
... ... lt/PeopleQuickFactsgt ... ...
ltGeographyQuickFactsgt... ..
lt/GeographyQuickFactsgt lt/Contentgt
lt/Resourcegt
lt?xml version"1.0" encoding"UTF-8"?gt
ltResource ShapeID20"gt ltIDgtCountry_20lt/IDgt
ltResourceNamegt ltNamegtChinalt/Namegt
lt/ResourceNamegt ltLocation
Type"Geometry"gt ... ... lt/Locationgt
ltCreatorgt ... ... lt/Creatorgt ltSourcegt ltLinkgt
http//... ... lt/Linkgt lt/Sourcegt ltContentgt
ltNamegtChinalt/Namegt
ltFIPS_CodegtCHlt/FIPS_Codegt
ltAreagt948.656lt/Areagt ltPerimetergt238.193lt/P
erimetergt ltPopulationgt1304536725lt/Populati
ongt lt/Contentgt lt/Resourcegt
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Example
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A Country Metadata Resource A City Metadata
Resource
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A DLESE Metadata Resource
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Metadata Schema Editor
MetadataSchema
Node Information
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Metadata Editor
MetadataRecord
MetadataElement
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Metadata Organization

• Metadata resources are organized into projects
• Project
• A logical grouping of a set of resources for a
  specific task
• For example, we may create a field study project
  on beach erosion for learning objects related
  to the topic.
• Layer
• Finer grained organization of resources within a
  project
• For example
• A map layer containing beach lines, water lines,
  headlands, etc...
• A profile layer containing profile data taken at
  different dates

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Metadata Organized in Categories
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Metadata Classification
Categories names are dynamic now we have
categories 1993-2002. Soon will have 2003
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Querying Metadata
Query Result Window
Query Window
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Annotation
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Personalized Projects

• Created for each student team or student
• Features
• General features of G-Portal projects
• Creation of new resources, layers, categories,
  etc..
• Cut and paste resources from the public project
• Annotations shared by team members

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Local Project Viewer

• Java application
• Downloading of projects and metadata onto local
  harddisk
• Local viewing of projects and metadata
• Creation/reference of contexts

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G-Portal for Field Study
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Field Study Activity

• Research conducted in the real environment where
  data are collected from live situations.
• We consider a field study for secondary school
  geography students
• In the field study
• Teacher needs to
• define objectives and tasks
• provide reading materials
• equip students with devices to take measurements
• provide assessment requirement
• Student needs to
• read up
• make trips to designated area
• collect data
• analyse data
• prepare report

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Field Study Activity (contd)

• A field study usually involves teams of students
• Each team of students should create/maintain a
  different set of resources along with those given
  by the teacher
• Resources should be organised
• Final report will make references to the
  resources
• G-Portals personalized project management
  attempts to answer the above requirements

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East Coast Park (ECP) Field Study

• Beach erosion study at East Coast Park (ECP)
  beach
• Objectives
• Understand what beach erosion is and what causes
  beach erosion
• Assess the current state of the beach
• Compute rough rate of erosion based on historical
  records
• Document findings

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Public ECP Project

• Teacher creates the public project containing
• Map of the designated beach area
• Previously collected resources about ECP beach
• Raw resources created as web pages, images, etc..
• Instructions for measuring beach profiles
• Required report format
• Public project made available to all student
  teams

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Public ECP Project
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New Personalized Project
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Copy the selected metadata resources
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Paste the saved resources
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Project Exportation

• All public and personalized projects reside on
  the G-Portal server
• User name and password required
• For local access, personalized projects can be
  exported to the local harddisk
• A Java application Local Project Viewer can be
  used to access the local projects
• Support references to personalized project from
  other local documents

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Context Management in Exported Personalized
Project

• Context refers to a specific snapshot or bookmap
  of a project that is registered for future
  reference.
• For example
• The zoom-in map of ECP beach at location A
  together with a metadata record of a photograph
  taken there

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Editing of Context (e.g., Context A)
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Editing of Context (e.g., Context A)
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Referencing Context

• Context referenced within G-Portal
• Context can be referenced by external documents
• F\GPortal\Local Projects\My_ecp.gpd
• F\GPortal\Local Projects\My_ecpECP Project
  Context A.gpd

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G-Portal Other Research Topics
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Text/Web Classification

• Aixin Sun and Ee-Peng Lim, Web Unit Based Mining
  of Homepage Relationships, Journal of the
  American Society for Information Science and
  Technology (JASIST), accepted, 2005.
• Aixin Sun and Ee-Peng Lim, Finding and
  Classifying Web Units in Web Sites,
  International Journal of Business Intelligence
  and Data Mining (IJBIDM), accepted, 2005.
• Aixin Sun, Ee-Peng Lim, Wee-Keong Ng, Jaideep
  Srivastava Blocking Reduction Strategies in
  Hierarchical Text Classification, to appear at
  IEEE Transactions on Knowledge and Data
  Engineering (TKDE), 2004.
• Aixin Sun, Ee-Peng Lim, Wee-Keong Ng,
  Performance Measurement Framework for
  Hierarchical Text, Journal of the American
  Society for Information Science and Technology
  (JASIST), Vol. 54, No. 11, page 1014-1028, Wiley,
  2003.
• Aixin Sun, Ee-Peng Lim, Web Unit Mining
  Finding and Classifying Subgraphs of Web Pages,
  International Conference on Information and
  Knowledge Management (CIKM2003), New Orleans,
  Louisiana, November 2003.
• Aixin Sun, Ee-Peng Lim, Wee-Keong Ng, HCL A
  Specification Language for Hierarchical Text
  Classification, 2nd International Workshop on
  Cooperative Internet Computing (CIC2002) in
  conjunction with the International Conference on
  Very Large Data Bases, Hong Kong, August 2002.

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Usability Techniques

• Theng, Y.L., Goh, D.H., Lim, E.P., Liu, Z., Ming,
  Y., Pang, N.L.S., and Wong, P.B. (In press).
  Applying scenario-based design and claims
  analysis to the design of a digital library of
  geography examination resources. Information
  Processing and Management.
• Theng Y.L., Goh, D.H., Ming, Y., Suen, E.K., and
  Lim, E.P. (2004). Design lessons on access
  features in PAPER. Paper accepted to the 7th
  International Conference on Asian Digital
  Libraries ICADL 2004, (December 13-17, Shanghai,
  China).
• Theng, Y.L., Goh, D.H., Lim E.P., Liu, Z.H.,
  Pang, N., Wong, P., and Chua, L.H. (2002).
  Intergenerational partnerships in the design of a
  digital library of geography examination
  resources. Proceedings of the 5th International
  Conference on Asian Digital Libraries, (December
  11-14, Singapore), Lecture Notes in Computer
  Science 2555, 427-439.
• Goh, D.H., Theng, Y.L., and Lim, E.P. (2004).
  From GeogDL to PAPER The evolution of an
  educational digital library. In Theng, Y.L. and
  Foo, S. (Eds.), Design and Usability of Digital
  Libraries Case Studies in the Asia Pacific.
  Hershey, PA Idea Group Publishing.

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Educational Applications

• Goh, D.H., Ang, R.P., Theng, Y.L., and Lim E.P.
  (In press). GeogDL A web-based approach to
  geography examination revision. Computers
  Education.
• Goh, D.H., Theng, Y.L., Ming, Y., Suen, E.K., and
  Lim, E.P. (2004). An interactive learning
  environment for a dynamic educational digital
  library. WSEAS Trans. on Computers, 3(3).
• Liu, Z., Yu, H., Lim, E.P., Ming, Y., Goh, D.H.,
  Theng, Y.L., and Ng, W.K. (2004). A Java-based
  digital library portal for geography education.
  Science of Computer Programming, 53(1), 87-105.
• Lim, E.P., Sun, A. Liu, Z. Hedberg, J., Chang,
  C.H., Teh, T.S., Goh, D.H., and Theng, Y.L.
  (2004). Supporting field study with personalized
  project spaces in a geographical digital library.
  Paper accepted to the 7th International
  Conference on Asian Digital Libraries ICADL 2004,
  (December 13-17, Shanghai, China).
• Goh, D.H., Theng, Y.L., Yin, M., and Lim, E.P.
  (2003). PAPER for an educational digital library.
  Proceedings of the 6th International Conference
  on Asian Digital Libraries, (December 8-11, Kuala
  Lumpur, Malaysia).
• Melati, D., Ming, Y., Theng, Y.L., Goh, D.H., and
  Lim, E.P. (2003). Towards a role-based metadata
  scheme for educational digital libraries A case
  study in Singapore. Proceedings of the Seventh
  European Conference on Research and Advanced
  Technology for Digital Libraries ECDL 2003,
  (August 17-22, Trondheim, Norway).
• Chua, L.H., Goh, D.H., Lim, E.P., Liu, Z., and
  Ang, R. (2002). A digital library for geography
  examination resources. Proceedings of the Second
  ACMIEEE Joint Conference on Digital Libraries,
  (July 14-18, Portland, Oregon, USA).
• Theng, Y.L., Goh, D.H., Lee, C.K., Lim, E.P. and
  Liu, Z.H. (2002). Digital libraries to knowledge
  portals Towards a global knowledge portal for
  secondary schools in Singapore. Proceedings of
  the International Conference on Digital Library
  of IT Opportunities and Challenges in the New
  Millennium, (July 8-12, Beijing, China), 291-303.

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Place Name Assignment/Ontology-based Web
Annotation/Query Processing

• Wenbo Zong, Dan Wu, Aixin Sun, Ee-Peng Lim, Dion
  H. Goh, On Assigning Place Names to Geography
  Related Web Pages, Joint Conference on Digital
  Libraries (JCDL2005), Denver, Colorado, June
  2005.
• Myo Myo Naing, Ee-Peng Lim, Roger Chiang. CORE
  A Search and Browsing Tool for Semantic Instances
  of Web Sites, 7th Asia Pacific Web Conference
  (APWeb2005), Shanghai China, March 2005.
• Myo-Myo Naing, Ee-Peng Lim, Dion Goh Hoe-Lian, A
  Survey of Ontology-Based Web Annotation, The
  First International Conference on Computer
  Applications, Yangon, Myanmar, January 15, 2003.
• Myo Myo Naing, Ee-Peng Lim, Dion Goh Hoe Lian
  Ontology-based Web Annotation Framework for
  Hyperlink Structures, International Workshop on
  Data Semantics in Web Information Systems
  (DASWIS'02), Singapore, December 2002.
• Zehua Liu, Ee-Peng Lim, Wee-Keong Ng, Dion
  Hoe-Lian Goh, On Querying Geospatial and
  Georeferenced Metadata Resources in GPortal,
  ACM/IEEE Joint Conference on Digital Libraries
  (JCDL2003), Houston, May 27-31 2003.

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Ongoing Research

• Community-based metadata review and creation
  system to create and manage the metadata of
  learning objects
• Object sharing mechanism with existing Geography
  learning object repositories, e.g. DLESE and
  ADEPT
• Concept based indexing for learning objects in
  the Geography domain
• Distributed search and visualization capabilities
  for learning objects relevant to the user needs
  in Geography
• Transduction of distributed learning objects into
  personalized project space of student users
• Geography teachers and students to use G-Portal

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End of Talk (QA) A/Prof Lim Ee
Peng aseplim_at_ntu.edu.sg