Su introduces in Chapter 9 the factors influencing time synchronization
and the design challenges encountered in determining guidelines for
developing time synchronization protocols. In Chapter 10, Liu and Jia show
how to apply the quorum method to some problems including location service,
information dissemination and object tracking. In Chapter 11, Kumar, Arora,
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and Lai present a case study of ExScal ??” a wireless sensor network deployed
management techniques are also discussed.
Section III is devoted to data management, which is a very important
task as well as a big challenge for sensor networks. Chapter 12, by Li, Cai,
and Li, gives a detailed survey of data management in sensor networks. Data
aggregation is introduced by Fan, Liu, and Sinha, in Chapter 13. In Chapter
14, Ma and Cheng compare some clustering-based schemes in sensor networks.
Cohen, Goldberg, and de Oliveira present in Chapter 15 a new approach to
constrained tra?±c engineering routing. Krishnamachari surveys in Chapter 16
some models for data gathering in sensor networks.
Section IV discusses security issues in sensor networks. In Chapter 17,
Du and Xiao summarize the typical attacks on sensor networks and present
the current state-of-art of research on sensor network security. Chapter 18
by Corbett, Copeland, and Beyah introduces the use of spectral analysis to
di?®erentiate homogeneous sensor nodes from sensors with a di?®erent radio
interface composition in order to address the problem of unauthorized access.
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