Processors keep increasing the speed at which they can execute program instructions. The bandwidt... more Processors keep increasing the speed at which they can execute program instructions. The bandwidth available for both wired and wireless communications keeps growing. Specialized hardware such as sensors, actuators, and hand- held devices keep improving their power efficiency and size factor. Consequently, we can expect that computers, com- munication infrastructures, and specialized hardware will interact more and more to form
Proceedings of the 7th ACM Conference on Embedded Networked Sensor Systems - SenSys '09, 2009
Physicalnet is a fully implemented middleware for wireless networks of sensors and actuators (WNS... more Physicalnet is a fully implemented middleware for wireless networks of sensors and actuators (WNSAs). Based on a lightweight service oriented architecture (SOA), Physicalnet allows the users to create administrative domains, in which owners of the nodes can share and protect their resources so that multiple applications can simultaneously use the same sensors and actuators with conflict resolution mechanisms. By using
This paper describes a novel group-based programming abstraction called a “Bundle” for cyber-phys... more This paper describes a novel group-based programming abstraction called a “Bundle” for cyber-physical systems (CPS). Similar to other programming abstractions, a Bundle creates logical collections of sensing devices. However, previous abstractions were focused on wireless sensor networks (WSNs) and did not address key aspects of CPS. Bundles elevate the programming domain from a single WSN to complex systems of systems
In this paper we describe the DeTella distributed overlay directory service. DeTella is composed ... more In this paper we describe the DeTella distributed overlay directory service. DeTella is composed of network nodes that reside in a logical address space. Data that is inserted into the network is "owned" by a single node and replicated by "neighboring" nodes. Each data item has a ...
This article describes one of the major efforts in the sensor network community to build an integ... more This article describes one of the major efforts in the sensor network community to build an integrated sensor network system for surveillance missions. The focus of this effort is to acquire and verify information about enemy capabilities and positions of hostile targets. Such missions often involve a high element of risk for human personnel and require a high degree of stealthiness. Hence, the ability to deploy unmanned surveillance missions, by using wireless sensor networks, is of great practical importance for the military. Because of the energy constraints of sensor devices, such systems necessitate an energy-aware design to ensure the longevity of surveillance missions. Solutions proposed recently for this type of system show promising results through simulations. However, the simplified assumptions they make about the system in the simulator often do not hold well in practice, and energy consumption is narrowly accounted for within a single protocol. In this article, we describe the design and implementation of a complete running system, called VigilNet, for energy-efficient surveillance. The VigilNet allows a group of cooperating sensor devices to detect and track the positions of moving vehicles in an energy-efficient and stealthy manner. We evaluate VigilNet middleware components and integrated system extensively on a network of 70 MICA2 motes. Our results show that our surveillance strategy is adaptable and achieves a significant extension of network lifetime. Finally, we share lessons learned in building such an integrated sensor system.
Processors keep increasing the speed at which they can execute program instructions. The bandwidt... more Processors keep increasing the speed at which they can execute program instructions. The bandwidth available for both wired and wireless communications keeps growing. Specialized hardware such as sensors, actuators, and hand- held devices keep improving their power efficiency and size factor. Consequently, we can expect that computers, com- munication infrastructures, and specialized hardware will interact more and more to form
Proceedings of the 7th ACM Conference on Embedded Networked Sensor Systems - SenSys '09, 2009
Physicalnet is a fully implemented middleware for wireless networks of sensors and actuators (WNS... more Physicalnet is a fully implemented middleware for wireless networks of sensors and actuators (WNSAs). Based on a lightweight service oriented architecture (SOA), Physicalnet allows the users to create administrative domains, in which owners of the nodes can share and protect their resources so that multiple applications can simultaneously use the same sensors and actuators with conflict resolution mechanisms. By using
This paper describes a novel group-based programming abstraction called a “Bundle” for cyber-phys... more This paper describes a novel group-based programming abstraction called a “Bundle” for cyber-physical systems (CPS). Similar to other programming abstractions, a Bundle creates logical collections of sensing devices. However, previous abstractions were focused on wireless sensor networks (WSNs) and did not address key aspects of CPS. Bundles elevate the programming domain from a single WSN to complex systems of systems
In this paper we describe the DeTella distributed overlay directory service. DeTella is composed ... more In this paper we describe the DeTella distributed overlay directory service. DeTella is composed of network nodes that reside in a logical address space. Data that is inserted into the network is "owned" by a single node and replicated by "neighboring" nodes. Each data item has a ...
This article describes one of the major efforts in the sensor network community to build an integ... more This article describes one of the major efforts in the sensor network community to build an integrated sensor network system for surveillance missions. The focus of this effort is to acquire and verify information about enemy capabilities and positions of hostile targets. Such missions often involve a high element of risk for human personnel and require a high degree of stealthiness. Hence, the ability to deploy unmanned surveillance missions, by using wireless sensor networks, is of great practical importance for the military. Because of the energy constraints of sensor devices, such systems necessitate an energy-aware design to ensure the longevity of surveillance missions. Solutions proposed recently for this type of system show promising results through simulations. However, the simplified assumptions they make about the system in the simulator often do not hold well in practice, and energy consumption is narrowly accounted for within a single protocol. In this article, we describe the design and implementation of a complete running system, called VigilNet, for energy-efficient surveillance. The VigilNet allows a group of cooperating sensor devices to detect and track the positions of moving vehicles in an energy-efficient and stealthy manner. We evaluate VigilNet middleware components and integrated system extensively on a network of 70 MICA2 motes. Our results show that our surveillance strategy is adaptable and achieves a significant extension of network lifetime. Finally, we share lessons learned in building such an integrated sensor system.
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