The physics departments and documents network EUNIS Conference, Bled, June 29 th -July 2 nd 2004 Michael Schlenker: [email protected] Dynamic.

EUNIS Conference, Bled, June 29th-July 2nd 2004

Michael Schlenker: [email protected]

the physics departments and documents network

Dynamic Thesaurus and Dynamic Discovery of

DistributedeLearning Materials

Michael Schlenker

Eberhard R. Hilf

Julika Mimkes


www.physnet.net


Michael Schlenker [email protected]

Institute for Science Networking GmbH Develop new concepts and services

for the management of information in science

Develop and operate Internet portals for science and its subject areas

Develop tools for networking of and access to scientific information

Offer services around the learnmangement system Campus Virtuell

Plays an active role in national, international and interdisciplinary boards and initiatives concerning standardization and information services for sciences

http://www.isn-oldenburg.de


www.physnet.net



Overview PhysNet and physik multimedial The web crawler system Adapting the crawler to eLearning First Tests


www.physnet.net



• Distributed service

• Catalogue style link lists of institutions, publication repositories and educational collections

• HARVEST search engine

• Search in LiLi , database

P h ysD epP h ys ics D e p artm e n ts

P h ysD ocP h ys ics D o cum e n ts

E d uca tion

www.PhysNet.ne t


www.physnet.net



physik multimedial Learning Platform

Course Management

Module Collection

Exercises Collection

Links to eLearning material in Physics


www.physnet.net



SHRIMPS

Simple HTTP Robot to IMprove Physnet Services

Specialized web crawler developed to find publications on personal or institutional webpages

Increases coverage and reduces noise in contrast to general purpose search engines


www.physnet.net



SHRIMPS for Publications Tested on European

part of PhysDep (1810 links)

Using part of a physics thesaurus generated from ArXiv and IOP metadata for classification

Tests show an 28% increase in the number of objects collected by HARVEST

The resulting relative amount of relevant objects was improved


www.physnet.net



Publications vs. eLearning material

Digital libraries

Publications deposited at personal or institutional repositories

SHRIMPS finds publications in personal or institutional repositories

Learning management systems

Material deposited at personal or institutional repositories

Can SHRIMPS find eLearning material ?


www.physnet.net



Resource discovery From LM Systems Resources can typically be

discovered only with cooperation of the LMS

Resources in LMS are typically structured and annotated with metadata (LOM, DC, others).

Resource discovery from LMS is complex, requiring standardized metadata and interfaces.

From Webpages Resources can be

discovered without cooperation

Resources are typically unstructured and lack metadata

Resource discovery from the web is a problem of identifying resources.


www.physnet.net


Michael Schlenker [email protected] Institutional, Workgroup or

Personal Websites

Users

HARVEST

HTTP

SHRIMPS and HARVEST

SHRIMPS

UIDB

SOAP

HTTP

Operator/Reviewer

URLs


www.physnet.net



How SHRIMPS works Crawl over a webserver

by following links Only follow links that

appear like they could lead to relevant data

Pages reached are classified as relevant, if their trail of links or their content appearance suggests their relevance


www.physnet.net



SHRIMPS Implementation Based on the highly portable and

mature Tcl (Tool Command Language) language

TclHttpd application server provides Web GUI and job control

Tcl based tuplespace with TclSOAP provides communication between components

Tclkit helps with easy deployment


www.physnet.net



SHRIMPS User InterfaceWeb browser based user interface provides access to:

User management

Job management

Review of result sets


www.physnet.net



Browser based review ToolA fast and efficient XML SOAP based tool for rating web pages, usually with a single mouseclick, is under development.

Current version is implemented using the Mozilla XUL technology.

Support for other browsers could be developed if requested by our operators.


www.physnet.net



Adapting SHRIMPS on Learning Material

Create new list of terms characteristic for eLearning

Examine typical webservers to understand where eLearning material is ‚hidden‘.

Refine the lists and exclusion patterns


www.physnet.net



Test Setup 82 Institutions from the UK and Germany

listed in the PhysDep list of physics departments

Physics term list from former publications search used, enhanced with some field specific terms

Filter lists created by hand from examination of some servers


www.physnet.net



Results of Test Run924

540

217

35

Irrelevant

eLearningrelevant

Personalhomepages

Scientificpublications


www.physnet.net



Examining the results About 30% relevant URLs Ratio of relevant to irrelevant is better than for

brute-force indexing Results are more heterogeneous for

eLearning material than for publications


www.physnet.net



Looking at staff homepages Publications are very often linked Learning material is only seldom linked

Hypothesis:(External) reputation is primarily gained by publications today. The increasing visibility of teaching through eLearning will create a reputation for teaching.


www.physnet.net



Future Work Promote the use of open interfaces for LMS

(OAI-PMH) Integrate the SHRIMPS results into the

Education part of PhysNet Adjust the system with the gained experience


www.physnet.net



LinksPhysNet

http://www.physnet.net

physik multimedial http://www.physik-multimedial.de

Institute for Science Networking Oldenburg GmbHhttp://www.isn-oldenburg.de


www.physnet.net



Thanks for your attention

The physics departments and documents network EUNIS Conference, Bled, June 29 th -July 2 nd 2004 Michael Schlenker: [email protected] Dynamic.

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