How To Improve M

1
How To Improve MS-Credibility and -Efficiency
For IncreasinglyComplex Simulation Application!?

• Axel Lehmann

2
Major Challenges

• Mastering of system(s) complexity over
  lifetime w.r.t. multiple aspects/ goals?
  (safety, reliability, performance,)
• Approach Goal-oriented, efficient, effective
  and dependable models!
• Mastering of model(s) complexity !?? STRATEGIC
  approach Devide and Conquer!? MODEL-ENGINEERIN
  G approach!!

3
MS-Approach Divide and Conquer
improving EFFICENCY
increasing CREDIBILITY
4
Outline

• MS A Multiple-Phase Development Application
• Improving MS-Efficiency by Component-Based MS
• Increasing Credibility through MS-Verification
  Validation
• Conclusion

5
1. MS A Multiple-Phase Development and
Application Process

• Analyses goals e.g. ? processing time per
  transaction ? client/server utilization ?
  queueing
• How to approach this (complex) problem?? Divide
  and Conquer? A Multiple-Phase MS Process

6
MS Development Team (Skills)
7
Phases Products in the MS-Development Process
8
Example Booking System

• Conceptual Model

9
Example Booking System

• Formal Model

10
Example Booking System
11
2. Model Component-Based Approach
(e.g. regarding the example Booking System)

• Conceptual Model
• ? modeling objects as components
• ? different levels of abstraction
• Formal Model ? formal specification of
  components (? selected modeling
  paradigm(s)) ? hierarchical modeling approach
  (? decomposition into submodels/ components)

12
Phases Products in the MS-Development Process
t
13
Model (Component) Specification Levels
14
3. Increasing MS-Credibility
15
Influences VV Framework
16
Multi-phase MS-process ?intermediate products
17
Our Approach The VV Triangle
18
Trends in Engineering and Manufacturing

• Rapid technological innovations
• information and communication technologies
• computer-assisted tools (e.g. CAD, CAM, . . . )
• Increasing systems complexity lifetime
• embedded systems
• networked components / systems
• distributed systems
• Increasing productivity cost-benefit relations
• Decreasing cycle times for systems innovations

19
Model Development VV
I
t
20
VV - Process Tailoring
I
t
21
Our Contribution to International Efforts on VV

• ITOP International Test Operations Procedure
• (Working Group of Experts WGE 7.2 VV)
• NMSG Nato Modeling and Simulation Group
• (019 Task Group 016 VV of Federations)
• SISO PDG SISO Product Development Group
• (VV of Federations)

• VV CONVENTION
• (October 20-24, Munich-Germany)
• http//www.itis-ev.de/megameeting

22
4. Conclusions

• Strategic approach Divide and Conquer !? MS
  as a Multi-Phase Engineering Process
• Efficient MS-design by component-based modeling
• Credibility assurance by risk-based VV

• Summary
• How to improve MS-credibility and efficiency for
  increasingly complex simulation applications?

23
Focus of our research efforts

• Model engineering process
• Re-useability of model components
• Tailored model documentation
• (Risk analysis) ? tailored VV (A)
• MS performance reliability
• Parallel and distributed MS
• (Collaborative modeling)

24
Thank you very much for your interest and
attention!
I
t
25
MS Source of Knowledge and Expertise
26
Example Booking System

• Example Booking System
• Formal Model (Version 1) queuing net