Challenges : An Application Model for Pervasive Computing

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Challenges An Application Model for Pervasive
Computing

• Guruduth Banavar, James Beck, Eugene Gluzberg,
  Jonathan Munson, Jeremy Sussman, DeborraZukowski.
  
• Proc. 6th ACM MOBICOM , Boston, Mass., August
  2000.
• Presenter Youn Do, Lee
• (ydlee_at_mmlab.snu.ac.kr)

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Why this presentation?

• To recognize challenges for Pervasive Computing
• especially from the perspective of application.

Pervasive Computing!
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Outline

• Pervasive Computing
• Todays problem
• New Vision
• New Application Model
• A Glimpse of tomorrow
• Related Work
• Conclude

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Pervasive Computing

• Anytime Anywhere Anydevice Anydata-
  Anyservice
• Smart or Active Space
• Context Awareness

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Todays Problem

• The program has to be different on the different
  devices.
• The program doesnt live in the environment.
• Some of devices cannot speak to one another.
• The program requires the specific services.

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New Vision

• Vision can be summarized in three precepts.

A device is a repository of custom software
managed by user
A device is a portal into an application/data
space
An application is a piece of software that is
written to exploit a devices capabilities
The computing environment is a virtual space that
exists to store and run software
An application is a means by Which a user
performs a task
The computing environment is the users
information-enha nced physical surroundings.
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New Application Model(1)

• The life cycle of an application

The developer creates, maintains and enhances the
application
Design Time
The system loads the application components
into an application instance on particular devices
Load Time
The end-user invokes the applica tion and uses
its functionality
Run Time
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New Application Model(2)

• Design Time
• Identifying abstract interaction elements that
  capture user intent, not device mechanism.
• Specifying an abstract service description
  language.
• Creating a task-based model for program
  structure.
• Specifying what causes a task to begin and end,
  and what tasks precede and follow it.

An ideal development methodology for building an
application is to focus on the user task, rather
than the user's interaction with an interface on
a specific device in a specific environment.
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New Application Model(3)

• Load Time
• Dynamic Discovery Mobile device can dynamically
  identify and enumerate the applications and
  services in its local vicinity.
• Requirements and capability negotiation - A
  device needs to negotiate with a server that
  hosts applications and services.
• Presentation Selection The system needs to
  support dynamic selection of an appropriate
  application interface from a set of available
  interfaces based on the devices resources and
  form-factor.
• Adaptation and Composition The system needs to
  seamlessly integrate the applications and
  services found in the environment.

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New Application Model(4)

• Run Time
• Monitoring and Redistribution The system needs
  to detect changes in the resources of any device
  or environment .
• Handoff of task The system must allow a user to
  initiate and perform a task in an uninterrupted
  manner, despite changes in the environment and
  devices.
• Disconnection If the network connection between
  client and server is detected to degrade, code
  might be migrated from the server to the client.
• Failure Detection and Recovery Many existing
  failure detection and recovery techniques may
  need to be modified. (e. g., Understanding
  disconnection.)

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A Glimpse of Tomorrow

• The application is built to be run on any device.
• The application is no longer thought of as a
  selling tool for a device.
• The concept of upgrading software may become
  anachronistic.
• Etc.

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Related Work

• Existing technologies
• User-Interface Management Systems (UIMS)
• Client-server Computing Model
• Java Computing Model
• Web Technologies
• Service Technologies (e. g., Bluetooth, MOCA)
• On-going pervasive efforts
• Portolano, University of Washington
• Oxygen, MIT

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Conclude

• PIMA, IBM T.J. Watson Research Center
• Project Leaders tomorrow
• Having the same vision while lying in the
  different beds.
• This paper challenges you, not others.

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Thank you, Any Question?