Introduction to Pervasive ComputingSlides based on the article “Pervasive Computing:

Vision and Challenges”by Prof. M. Satyanarayanan, Carnegie Mellon University,

IEEE Personal Communications, 2001[Possible mistakes and omissions are all are our ]

Presented By

M.Phil-IT, 2014 A.R Baloch

Context Aware System

Context awarenessContext awareness is a property of mobile devices that is defined complementarily (match) to location awareness. Whereas location may determine how certain processes in a device operate, context may be applied more flexibly with mobile users, especially with users of smart phones.

Context awareness refers to the idea that computers can both sense, and react based on their environment. Devices may have information about the circumstances under which they are able to operate and based on rules, or an intelligent stimulus, react accordingly.

Context-aware pervasive systems

Context-aware computing refers to a general class of mobile systems that can sense their physical environment, and adapt their behavior accordingly. Context-aware systems are a component of a ubiquitous computing or pervasive computing environment. Three important aspects of context are:

1. Where you are;2. Who you are with;3. What resources are nearby?

Although location is a primary capability, Context-aware in difference is used more generally to include nearby people, devices, lighting, noise level, network availability, and even the social situation, e.g., whether you are with your family or a friend from school.

Aura – Introduction (Human)

Many forms of spiritual(Holy) practice, an aura is a field of shining radiation surrounding a person or object (like the halo). Often it is held to be perceptible, whether suddenly or with practice: such perception is at times linked with the third eye (or sixth Sense). Various writers associate various personality traits with the colors of different layers of the aura. It has also been described as a map of the thoughts and feelings surrounding a person.

Aura – Introduction (Computer)

•The idea of Aura implemented human to mobile computing.

•Where 6th scene of person which is worked eventually (sooner or later) but through mobile computing it is worked all the time.

Scenario 1Miss. Jane is at Gate 23 in the airport, waiting for her connecting flight. She has edited many large documents, and would like to use her wireless connection to e-mail them. Unfortunately, bandwidth is miserable because many passengers at Gates 22 and 23 are surfing the web. Aura observes that at the current bandwidth Jane won’t be able to finish sending her documents before her flight departs. Consulting the airport’s network weather service and flight schedule service, Aura discovers that wireless bandwidth is excellent at Gate 15, and that there are no departing or arriving flights at nearby gates for half an hour.

Scenario 1 (con..)

A dialog box pops up on Jane’s screen suggesting that she go to Gate 15, which is only three minutes away. It also asks her to prioritize her e-mail, so that the most critical messages are transmitted first. Jane accepts Aura’s advice and walks to Gate 15. She watches CNN on the TV there until Aura informs her that it is close to being done with her messages, and that she can start walking back. The last message is Transmitted during her walk, and she is back at Gate 23 in time for her boarding call.

ResultsAccording to these context Aura Suggest the Jan. •  Location Context • Activity Context • Identity Context & Attribute Context • Bandwidth Context • Time context• Departing or arriving schedule of airplanes • How many passengers surfing the web at Gates context• weather service as a context• Gates 22 and Gate 23 context• Distance between Gates 22, Gate 23, and Gate15 Context

On the behalf of all context Aura can suggest best way out to it’s user.

ReferenceM. Satyanarayanan, “Pervasive Computing: Vision and Challenges,” IEEE Personal Communications, 2001

Available at:http://www.cs.cmu.edu/~aura/docdir/pcs01.pdf