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Prague, 8-11 June 2009
Assessing the Quality of Service of Powel’s Netbas at a Nordic Utility
Per Närman, Ph.D StudentIndustrial Information and Control Systems, KTH
+46-8-790 68 [email protected]
CIRED 10 June 2009
Per Närman-Sweden Session 3 Paper 0326
Prague, 8-11 June 2009
Agenda
• Importance of IT for Maintenance management• Technical quality – what is it?• Technical quality – how to assess it• Case study of technical quality at a Nordic
Utility
Per Närman-Sweden Session 3 Paper 0326
Prague, 8-11 June 2009
Asset Management & IT in the Power Industry
Demand for more efficientasset management!
Demand for better IT-usage!
Demand for analysis of current IT support
Per Närman-Sweden Session 3 Paper 0326
Deregulation and competition
Prague, 8-11 June 2009
IT strategy decisions need to take the Quality of Service into account
Quality of service includesFunctional and non-functional properties
Per Närman-Sweden Session 3 Paper 0326
Prague, 8-11 June 2009
The investigated system:Powel’s NetBas
• Network Information System– network analyzing
engine– project management – …and plenty more– This study focus on the
first two
Per Närman-Sweden Session 3 Paper 0326
Prague, 8-11 June 2009
Technical quality - definition• Based on the ISO 9126 standard for software quality evaluation• Covers functional and non-functional properties
Per Närman-Sweden Session 3 Paper 0326
Prague, 8-11 June 2009
For this study – delimited framework
Per Närman-Sweden Session 3 Paper 0326
Prague, 8-11 June 2009
Use litterature to break downnon-functional properties
Quality of maintenance
personnel
System Expertise
Experience
System Architecture
Quality
System Change History
System Stability
Age of System
Size of System
PL ExpertiseNo. Relations to ext. Systems
Per Närman-Sweden Session 3 Paper 0326
Prague, 8-11 June 2009
Method – using Bayesian Networks for assessment
Availability of A Up Down
Availability of B Up Down Up Down
Availability of C Up 1 0 0 0
Down 0 1 1 1
Using the software tool GeNie
Prague, 8-11 June 2009
Defining a modeling language to model the application
Prague, 8-11 June 2009
Case study – modeling and assessing Powel NetBas at a Nordic utility
• Data:• 9 interviews• Document studies• Tests.
• Created model (left)• Shows architecture• Shows mean values
Prague, 8-11 June 2009
Computations – huge Bayesian network implemented in GeNie
Prague, 8-11 June 2009
Results
• 3.78 out of 6• Improvement measures:
– Accuracy: data lacking in database leads to low accuracy– Usability: need better training and ‘help’-functions.– Efficiency: improve Local Area Network at utility
headquarters
Prague, 8-11 June 2009
Summary
• Assessment of Technical Quality• Used Bayesian Networks• Case study - built a model of NetBas• Evaluated model with Bayesian
network• Suggested a number of improvements
Prague, 8-11 June 2009
Thank you!Questions?
