User/App Characterization

1
User/App Characterization

• Ugur Cetintemel
• Guerney Hunt
• Ravi Jain
• Anupam Joshi
• Ryu Masuoka
• Jignesh Patel
• Jean Scholtz
• Ouri Wolfson
• Arkady Zaslavsky

2
Motivation

• Cardinality of the actor set
• Dynamic/unpredictable nature of current context
• Scalability performance
• Lack of support for semantics in current systems
• Complexity of context dependencies

3
Relationship between context, profile and actors

• Name
• Colour
• Sport

More control More static
profile
1n or 11 ???
actor

• Location
• Time
• Tennis score

less control less static

• Human
• Device
• Software

context
4
Context

• Context abstractions
• Using context
• Manipulating context information
• Interpreting context
• Detecting, sensing discovering context

5
System Adaptability

• Adjustment of the system (actors context
  associations) to dynamic context
• Reasons include minimizing cost, optimizing
  performance, etc
• Internal external adaptation
• Monitoring
• Reactivity proactivity
• Black box feedback loop

6
Priorities, open issues

• Association between actors context
• Metacontext ??? Formalisms ???
• Inter- intra- context dependencies
• Storing, Retrieving, Accessing context info
• Resource description discovery
• Context privacy security
• Scaling zillions of actors, context attributes
  and associations
• Minimizing human distraction
• Composition, engineering and debugging of
  pervasive systems

7
Links

• Middleware, OMG
• Software engineering , component SE
• Telcos(Ericsson, Nokia, Motorola, Siemens)
• Wireless networks
• Hardware vendors
• Operating systems
• Software agents AI
• HCI
• WWW, semantic web