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Underwater sensor nodes will find applications in oceanographic data collection, pollution monitoring, offshore exploration, disaster prevention, assisted navigation and tactical surveillance applications. Moreover, unmanned or autonomous underwater vehicles (UUVs, AUVs), equipped with sensors, will enable the exploration of natural under-sea resources and(More)
Ocean bottom sensor nodes can be used for oceanographic data collection, pollution monitoring, offshore exploration and tactical surveillance applications. Moreover, Unmanned or Autonomous Underwater Vehicles (UUVs, AUVs), equipped with sensors, will find application in exploration of natural undersea resources and gathering of scientific data in(More)
Underwater networks of sensors have the potential to enable unexplored applications and to enhance our ability to observe and predict the ocean. In this paper, architectures for two-dimensional and three-dimensional underwater sensor networks are proposed. A detailed overview on the current solutions for medium access control, network, and transport layer(More)
Underwater sensor networks consist of sensors and vehicles deployed to perform collaborative monitoring tasks over a given region. Underwater sensor networks will find applications in oceano-graphic data collection, pollution monitoring, offshore exploration, disaster prevention, assisted navigation, tactical surveillance, and mine reconnaissance.(More)
Wireless Sensor and Actor Networks (WSANs) are composed of a large number of heterogeneous nodes called <i>sensors</i> and <i>actors</i>. The collaborative operation of sensors enables the <i>distributed sensing</i> of a physical phenomenon, while the role of actors is to collect and process sensor data and perform appropriate actions.In this paper, a(More)
The concept of a wireless underground sensor network (WUSN) is introduced and applications are discussed. The feasibility of utilizing commonly available terrestrial wireless sensor network (WSN) hardware solutions in the underground environment is examined. Experiments are run to examine the packet error rate and the received signal strength of correctly(More)
— Since sensor networks can be composed of a very large number of nodes, the developed protocols for these networks must be scalable. Moreover, these protocols must be designed to prolong the battery lifetime of the nodes. Typical existing routing techniques for ad hoc networks are known not to scale well. On the other hand, the so-called geographical(More)
—UnderWater Acoustic Sensor Networks (UW-ASNs) consist of sensors and Autonomous Underwater Vehicles (AUVs) performing collaborative monitoring tasks. In this article, UW-MAC, a distributed Medium Access Control (MAC) protocol designed for UW-ASNs, is introduced. The proposed MAC protocol is a transmitter-based Code Division Multiple Access (CDMA) scheme(More)
—Since ad hoc and sensor networks can be composed of a very large number of devices, the scalability of network protocols is a major design concern. Furthermore, network protocols must be designed to prolong the battery lifetime of the devices. However, most existing routing techniques for ad hoc networks are known not to scale well. On the other hand, the(More)
In this paper, coordination and communication problems in wireless sensor and actor networks (WSANs) are jointly addressed in a unifying framework. A sensor-actor coordination model is proposed based on an event-driven partitioning paradigm. Sensors are partitioned into different sets, and each set is constituted by a data-delivery tree associated with a(More)