Wireless sensor networks are being employed in a variety applications ra- ing from medical to military, and from home to industry. The principle aim of this book is to provide a reference tool for the increasing number of scientists who depend upon sensor networks in some way. The book is organized into several sections, each including chapters exploring a speci?c topic. Wireless sensor networks are attracting great attention and there are many research topics yet to be studied. In this book, the topics covered include n- work design and modelling, network management, data management, security and applications. The articles presented in the book are expository, but of a scholarly nature, including the appropriate history background, a review of the state-of-the-art thinking relative to the topic, as well as a discussion of unsolved problems that are of special interest. The target readers of this book include the researchers in computer s- ence, computer engineering, and applied mathematics, as well as students in these subjects. Specialists as well as general readers will ?nd the articles st- ulating and helpful. Book Organization The book is organized into ?ve sections. Section I introduces the design and modelling of sensor networks. Chapter 1, by Iyer, Kulkarni, Mhatre, and Rosenberg, presents a taxonomy of wireless sensor networks, based on their application level objectives, träc characteristics and data delivery requi- ments. Popa and Lewis in Chapter 2 describe some algorithms for systematic exploration of unknown environments using a mobile wireless sensor network.

Wireless sensor networks are currently employed in a variety of applications ranging from medical to military, and from home to industry. This book provides a reference tool for the increasing number of scientists who depend upon sensor networks in a widening variety of ways. Coverage includes network design and modeling, network management, data management, security and applications. The topic covered in each chapter receives expository as well as scholarly treatment, covering its history, reviewing state-of-the-art thinking relative to the topic, and discussing currently unsolved problems of special interest.

Network Design and Network Modelling.- A Taxonomy-based Approach to Design of Large-scale Sensor Networks.- Algorithms for Robotic Deployment of WSN in Adaptive Sampling Applications.- A Scalable Graph Model and Coordination Algorithms for Mobile Sensor Networks.- Network Management.- Medium Access Control Protocols for Wireless Sensor Networks.- Topology Control for Wireless Sensor Networks.- Boundary Detection for Sensor Networks.- TPSS: A Time-based Positioning Scheme for Sensor Networks with Short Range Beacons.- Wakeup Strategies in Wireless Sensor Networks.- Time-Synchronization Challenges and Techniques.- Location Service, Information Dissemination and Object Tracking in Wireless Sensor Networks by Using Quorum Methods.- Maximizing the Lifetime of an Always-On Wireless Sensor Network Application: A Case Study.- Data Management.- Data Management in Sensor Networks.- Data Aggregation in Wireless Sensor Networks.- Performance Comparison of Clustering Schemes in Sensor Networks.- Reliable and Efficient Information Forwarding and Traffic Engineering in Wireless Sensor Networks.- Modeling Data Gathering in Wireless Sensor Networks.- Security.- A Survey on Sensor Network Security.- A Passive Approach to Unauthorized Sensor Node Identification.