Modeling Behaviour of the Users in Adaptive and Semantic-enhanced Information Systems: The Role of a...

Modeling Behaviour of the Users in Adaptive and Semantic-enhanced

Information Systems: The Role of a User Ontology

Dr. Liana Razmerita

Centre of Applied Information and Communication Technologies Copenhagen Business School

Liana Razmerita, Adaptive Hypermedia, 29/07/08

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Presentation Outline

IntroductionContext of research - KMSMotivation- painpoints of the actual KM toolsResearch Questions

Ontology-based User Modeling Conclusions and Outlook


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Context of researchKnowledge Management Systems (KMS)- information systems

dedicated to manage organizational knowledge (Leidner and Alavi, 2001).

Semantic-enhanced KMSs - Domain ontologies can improve KMS within organizations and among distributed web-comunities (Maedche et al., 2002, Velardi et al, 2007)

create

capitalize

share

KMS integrate complex knowledge processes:

• Support social processes: ks, kc.• Collaboration between employees;• Learning processes;• Management of tacit knowledge;

KM 1.0, KM 2.0, KM3.0 –semantic-enhanced


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Limitations of current KMSs

Need to better organize knowledge “Content is not correctly organized, not updated or [is] duplicated.”

Need for better knowledge filtering and user support “These tools need major improvement to allow users [to]

use knowledge tools in an easy way, spend less time and avoid getting lost among hundreds of document”,

”Save time when I am looking for a solution”

Need to better manage tacit knowledge “To know what people know and to make their

experience with technology and products accessible”.

Source: Survey on KMS (n=16 Ontologging End-Users )


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Research Questions

Why is it important to model users of a KMS? What are the relevant characteristics of the users of a KMS? What type of user’s behavior can be distinguished in a KMS? How to track and maintain the user models in a KMS?

What are the advantages/limitations of applying ontologies in user modeling? How to make us of the metadata?

How can a user model improve the interaction with a KMS? What type of intelligent /personalized services can be provided

based on the user’s characteristics?

How to build semantic-enhanced data models?What are the perspectives of its use in the context of the

Semantic Web?


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Related WorkUser Modeling Research

Adaptive hypermedia and personalized interactions (Kobsa, 2002),(Brusilovsky, 2007),(Cristea et al., 2007)

Ontology-based user modeling (Razmerita et al., 2003)(Kay and Lum, 2005)(Heckman et al., 2005, 2007) (Katifori et al., 2008)

Semantic Web and Ontology Research Ontology-based personalization: Dolog and Nejdl(2007) EPOS

(Schwarz and Roth-Berghofer,2002), Elena(Dolog et. al., 2003); (Henze et al. 2004)

Ontology, agents and corporate memory: FRODO(Van Elst & Abecker, 2001), CoMMA(Gandon and Dieng-Kuntz, 2001)

Knowledge Management Systems (O’Leary &Studer, 2001), (Nonaka et al. 2001), (Fischer &

Ostwald, 2001)


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From Ontology-based Knowledge Modeling to Ontology-based User ModelingIntegration of 2 different specifications for user model by 2

Spanish companiesBuilding a user ontology is not simple!

How achieve an agreed conceptualization, integrate specific characteristics of users interacting with KMS, completeness?

Adapt a methodology proposed by [Uschold and Gruninger, 1996]Step1 Specification phase

The use of IMS LIP specification Extends IMS LIP-upper ontology

Step 2 The process of coding KAON tool suite and Web ontology language extending RDF/RDFS

Step 3 The process of integrating with existing ontologies The definition of similar concepts as synonyms Different representation languages


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OI-Modeler View of User Ontology

Behavior Concept

TypeOfActivityLevelOfActivity

LevelOfKnowledge-Sharing


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Ontology-based User Modeling framework (OntobUMf)

User Model

User Profile

Editor

Intelligent Service I

EventsLogs

LogInstances

DomainInstances

User Ontology

Domain Ontology

Automatically

providedManually

provided

Intelligent Service n...

User Instances

Log Ontology

Documents

(Razmerita et al. 2003, Razmerita 2007)


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Intelligent Service: category extractor

Categories of users obtained by processing the logs (heuristics + fuzzy logic);Type of Activity: Readers/ Writers/ Lurkers;

If (nb_of_read_papers>NR) and (nb_of_contributions <NC) then user(x) =”reader” (during timeframe)If (nb_of_contributions>=NC) then user(x) =”writer” (during timeframe)….

Level of Activity: Very Active/Active/Visitor/Inactive;If (nb_of_read_papers > NR) and (nb_of_contributions >=NC+1) then

user(x) = “very active“ ….If (nb_of_read_papers =0) and (nb_of_contributions =0) Then user(x)

= “inactive” (during timeframe)


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Intelligent Service: category extractor

Level of Knowledge Sharing: Unaware, Aware, Interested, Trial, Adopters

Y=f(x1, x2)– [very high, high, medium, low, very low] x1 the type of activity: [high, medium, low]

x2 the level of activity: [high, medium, low, very low]

Y=f(x1, x2) high medium low very low

high very high very high medium

medium high medium low

low very low very low

The calculus of the level of knowledge sharing


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Findings-some evaluation results

Users are concerned with privacy and trust: User’s profile should be only partial available in a

KMS; Users want to be in control and to maintain their

profiles; The use of combo box would facilitate the

acquisition of the user’s data and the consistency of the terminology;

Ontologging end-users identify recognition and promotion as key incentive for knowledge sharing


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SummaryA top-down approach in building a user

ontology using IMS LIP specification-lack of ”know-how” on how to build an ontology?

User ontology extending IMS LIP (Information Management Systems Learning Information Package)

A standard/a specification can be usefull but can be limitative.

Ontology-based UM frameworkUser Behavior (level of activity, type of activity, level of

knowledge sharing)

Future work

Extending OntobUMf towards its use within KM2.0 (blogs, wikis)

OntobUMf in an e-learning scenario:LevelofActivity/TypeofActivity/LevelofKnowledge


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Modeling Behaviour of the Users in Adaptive and Semantic-enhanced Information Systems: The Role of a...

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