1. Presentation Title
September 22, 2019
Net-Centric Software and Systems I/UCRC QoS-Reconfigurable Web Services and Compositions for High Assurance Systems
Project Lead: Kendra Cooper, I-Ling Yen, Farokh Bastani
Date: April 1, 2010
Copyright © 2010 NSF Net-Centric I/UCRC. All rights reserved.
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2. Presentation Title
Presentation Title
September 22, 2019
September 22, 2019
New Problems
High assurance systems have very stringent QoS requirements
How to compose services to satisfy the QoS requirements?
A lot of work on QoS-driven service composition
Limited choices of services to provide QoS tradeoffs
Solution: Consider QoS-reconfigurable (QoS-R) services
A QoS-R service has configurable parameters that can control the QoS behavior of the service
Can help achieve dynamic adaptation and better QoS satisfaction
Issues
How to build QoS-R services? Developed from scratch or adapted from existing services?
How to compose services involving QoS-R services?
Huge search space
How to achieve real-time adaptation for changing QoS requirements and/or evolving environment, especially for services from multiple domains
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Speaker Name 2

3. Proposed Solution Adapt existing services Into QoS-R services
Presentation Title
Presentation Title
September 22, 2019
September 22, 2019
Proposed Solution
Adapt existing services
Into QoS-R services
Handle multi-domain services
Need to negotiate with service domains  costly
Use multi-level composition approach to rapidly filter out non-fitted candidates and only perform negotiation for top candidates
Service composition with QoS-R services
Problem: Huge search space
Find and store Pareto optimal solutions for individual services (offline)
Rapid integration of Pareto optimal solutions during service composition/adaptation
Progressive composition decisions
A+B  Pareto optimal solutions
A+B+C  Pareto optimal solutions …
Achieve real-time performance
configuration
QoS-driven Service composition
9/22/2019
9/22/2019
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Speaker Name 3

4. Presentation Title
September 22, 2019
2010/New Project Summary QoS-Reconfigurable Web Services and Compositions for High Assurance Systems
Tasks:
Enhance our component adaptation techniques and apply them to components in real-world services
Build the framework to facilitate real-time adaptation decision making with QoS-reconfigurable services from multiple domains
Apply the techniques to a net-centric case study system to validate their effectiveness
Project Schedule:
Task 2. Real-time composition decision
Task 1. Service Adaptation
Task 3. Case study
A M J J A S O N D J F M A 10 11
Research Goals:
Develop QoS-R service development technology
Achieve real-time QoS-driven service composition and adaptation
Efficient composition algorithm by composing Pareto solutions
Maintain partial solutions for future use
Develop multi-level composition for handling multiple service domains
Benefits to Industry Partners:
Significantly improved techniques for QoS-driven service composition
Support better dynamic adaptation for evolving QoS requirements
Achieve more efficient composition decisions in large-scale net-centric systems, such as command and control applications
Service adaptation and composition decision toolset
9/22/2019
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