Wireless sensor network (WSN) consists of sensors for measuring and gathering data in a variety of environments. These sensors, with the size and battery constraints, usually have limited transmission ranges due to the low-power wireless radio transceivers. In a sensor network, sensed data should be collected at a centralized location, called sink, for processing and analysis. With limited tran...

A wireless sensor network is deployed either inside the phenomenon or very close to it. Unlike some existing sensing techniques, the position of sensor network nodes need not be engineered or predetermined. This allows random deployment in inaccessible terrains. On the other hand, this also means that sensor network protocols and algorithms must possess self-organizing capabilities. Another uni...

a sensor network is made up of a large number of sensors with limited energy. sensors collect environmental data then send them to the sink. energy efficiency and thereby increasing the lifetime of sensor networks is important. direct transfer of the data from each node to the central station will increase energy consumption. previous research has shown that the organization of nodes in cluster...

target coverage is one of the important problems in visual sensor networks. the coverage should be accompanied with an efficient use of energy in order to increase the network lifetime. in this paper, we address the maximum lifetime for visual sensor networks (mlv) problem by maximizing the network lifetime while covering all the targets. for this purpose, we develop a simulated annealing (sa) ...

The objective of this paper is to emphasize a clear and natural distinction in strategies of sensor network design. In order to display different architectural paradigms in today’s wireless sensor networking, the classification of sensor networks as intensive and extensive ones is introduced and explained. Main paradigms representative for both technologies are compared. As follows from the dis...

In the past few years, many wireless sensor networks had been deployed, these applications serve to explore the requirements, constraints and guidelines for general sensor network architecture design. In this paper,we present a snapshot of the recent deployed sensor network applications and identify the research challenges associated with such applications.

State of the art data centers use wired sensors embedded in equipment for thermal monitoring. The high cost of sensor installation restricts equipment relocation. We propose using a wireless self-locating network of smart sensing nodes, called SmartLOCUS, for automatic sensor configuration. We explore how to design the sensor control software to be self-reconfiguring when nodes relocate. The so...

Sensor networks are not anticipatory, but ideally they should be. In order to detect intruders, the environment of the possible attack scene can be monitored, and the position of sensors modified in order to increase the probability of detection. When faced with a resourceful intruder, the problem of sensing context becomes more difficult, and must expand to include monitoring for information a...

The wireless sensor network is an emerging field and it offers a wide variety of applications that include habitat monitoring, object tracking, environmental surveillance, military systems, health care, precision agriculture, building monitoring etc. However, due to their unique characteristics and the constraints they suffer from, sensor networks pose considerable challenges and make applicati...

models of various processing elements and simulating the whole system to check if the tasks meet their local and/or end-to-end deadlines under precedence and resource constraints. This work has also formed the basis for other system-level modeling-related research activities such as networks-on-chip and reconfigurable computing platforms. Chapter 6 describes a further extension of our earlier w...