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In this paper, authors survey existing mobile phone sensing algorithms applications and systems. They discuss the emerging sensing paradigms and formulate an architecture framework for discussing a number of the open issues and challenges emerging in the new area of mobile phone sensing research.

Question answer session

a) what is the hall effect ?

The Hall effect is the production of a voltage difference (the Hall voltage) across an electrical conductor, transverse to an electric current in the conductor and a magnetic field perpendicular to the current.

b) Why do they use continuous sensing ?

They use it to classify and receive better result.

c) Why is opportunistic sensing difficult to build ?

It is a kind of continuous sensing. And we have to face with the challenges about small resources and good algorithms.

d) Can you give example about co-located mobile phone ?

It can save energy of mobile phone. For example, in one group, only one individual can turn on the GPS to share the data to another people.