Citation Context

...f a failure, faulty modules can be disabled to minimize their impact on the system. The motivation for this design comes from the experience with real-world sensor networks on Great Duck Island (GDI) =-=[12]-=-, [6]. On GDI, one of the main predictors of node failure was the existence of a failed sensor. Since the failure can be recognized in software, the ability to cut power to that section of the board m...

Citation Context

...ustic wave arrival times across the network. 1 Introduction Sensor networks are making inroads into a number of scientific explorations, including environmental monitoring [1, 25], habitat monitoring =-=[2, 10, 23]-=-, and structural monitoring [16, 14, 30]. In each of these domains, the use of low-power wireless sensors offers the potential to collect data at spatial and temporal scales that are not feasible with...

Citation Context

...t sensing devices. As a result, the past few years have seen a number of prototype sensor network deployments in diverse domains, a few notable ones being James Reserve [jam 2005], Great Duck Island [=-=Szewczyk et al. 2004-=-], Intel Berkeley [int 2004], CENS deployment at Bangladesh [Ramanathan et al. 2006], etc. However, all these deployments have been done in academic, scientific or engineering contexts, wherein they o...

Citation Context

...esence of a nesting bird [9]. Two years later, the researchers demonstrated a interpolation of surface temperature and burrow temperature at a single instant in time over the complete deployment area =-=[16]-=-. There is, of course, a wealth of biological studies that used small collections of data loggers and remote sensing to study temporal and spatial gradients in forest microclimate [10, 12, 13]. We app...

Citation Context

...valuable to be lost to communication error. 2. RELATED WORK WSN applications can be divided into two categories. The first category is environmental monitoring; networks deployed in Great Duck Island =-=[22]-=- and a Redwood forest [24] are examples of this class. For this class of problem the focus is on networks with low duty-cycle and low power consumption. The second category of WSN applications consist...

Citation Context

...schema generation. B. Management Evaluation SNMS, and the components built atop it, could assist in the process of sensor network deployment and health monitoring. In the Great Duck Island deployment =-=[14]-=-, nodes that were overhearing and forwarding traffic were found to have shorter lifetimes. The instrumented network stack of SNMS, in conjunction with the radio duty cycle control, can provide enough ...

Citation Context

...ployed sensor networks consist of dense patches of wireless nodes, where each patch is connected to the Internet via one or more gateway nodes, either directly or through some form of transit network =-=[5, 13, 43, 44]-=-. Unlike the Internet, aggregate communication is prevalent in sensor networks, whereas point-to-point communication is rare. Although each patch is often an edge network, it must address many of the ...

Citation Context

...hile contending with mote-tier resource constraints. We examine here a different point in the space of possible architectures, motivated by a property common to many recent sensor network deployments =-=[2, 10, 35]-=-. These deployments have two tiers: a lower tier consisting of motes, which enable flexible deployment of dense instrumentation, and an upper tier containing fewer, relatively less constrained 32-bit ...

Citation Context

...ork Structure The FabApp uses a hierarchical architecture to increase network scalability and to exploit resources available in the environment. Use of a hierarchical network structure is not new [2] =-=[18]-=-. In an industrial setting, a hierarchical architecture exploits heterogeneity within the sensor network. The FabApp architecture may be broken down into three logical hierarchies. The lowest layer, T...