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Challenges : An Application Model for Challenges : An Application Model for Pervasive ComputingPervasive 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@mmlab.snu.ac.kr)

MMLAB Why this presentation?Why this presentation?

To recognize challenges for Pervasive Computing

especially from the perspective of application.

Pervasive Computing!

MMLAB OutlineOutline

Pervasive Computing Today’s problem New Vision New Application Model A Glimpse of tomorrow Related Work Conclude

MMLAB Pervasive ComputingPervasive Computing

Anytime – Anywhere – Anydevice – Anydata- Anyservice

Smart or Active Space

Context Awareness

MMLAB Today’s ProblemToday’s Problem

The program has to be different on the different devices.

The program doesn’t live in the environment.

Some of devices cannot speak to one another.

The program requires the specific services.

MMLAB New VisionNew Vision

Vision can be summarized in three precepts.

A device is a repository of

custom software managed

by user

An application is a piece of

software that is written to

exploit a device’s capabilities

The computing environment

is a virtual space that exists

to store and run software

A device is a portal into an

application/data space

An application is a means by

Which a user performs a task

The computing environment

is the user’s information-enha

nced physical surroundings.

MMLAB New Application Model(1)New Application Model(1)

Design Time

Load Time

Run Time

The life cycle of an application

The developer creates, maintains

and enhances the application

The system loads the application components into an application instance on particular devices

The end-user invokes the applica

tion and uses its functionality

MMLAB New Application Model(2)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.

MMLAB New Application Model(3)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 device’s resources and form-factor.

Adaptation and Composition – The system needs to seamlessly integrate the applications and services found in the environment.

MMLAB New Application Model(4)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.)

MMLAB A Glimpse of TomorrowA 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.

MMLAB Related WorkRelated 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

MMLAB ConcludeConclude

PIMA, IBM T.J. Watson Research Center Project Leader’s tomorrow

Having the same vision while lying in the different beds.

This paper challenges you, not others.

MMLAB Thank you, Any Question?Thank you, Any Question?