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Urban environments are notorious for their high spectrum usage, particularly in their unlicensed radio bands. Wireless sensor network (WSN) nodes incorporate modern transceivers that can measure the background noise/interference and change channels. These combined capabilities suggest the need to better understand urban environments so that nodes can better(More)
Providing affordable, high-quality healthcare to the elderly while enabling them to live independently longer is of critical importance. In our Smart Condo project, we have deployed a wireless sensor network in an 850-square-foot condominium for assisted living. The sensor network records a variety of events and environmental parameters and feeds the(More)
Providing affordable, high-quality healthcare to the elderly while enabling them to live independently longer is of critical importance, as this is an increasing and expensive demographic to treat. Sensor-network technologies are essential to developing assisted living environments. In our Smart Condo project, we have deployed a sensor network with a(More)
The low-powered transmissions in a wireless sensor network (WSN) are highly susceptible to interference from external sources. Our work is a step towards enabling WSN devices to better understand the interference in their environment so that they can adapt to it and communicate more efficiently. We extend our previous work in which we collected received(More)
Mail channels allow an electronic mail (e-mail) user to have multiple points of contact, each with a potentially different policy. For example, a user may have two channels, one for personal use and one for business use. The former channel’s policy may accept all senders and the latter channel’s may restrict senders to those within a given(More)
We describe our " holistic " platform for developing wireless ad hoc sensor networks and focus on its most representative and essential virtualization component: VUE 2 (the Virtual Underlay Emulation Engine). Its role is to provide a vehicle for the authoritative emulation of complete networked applications before physically deploying any wireless nodes.(More)
We introduce our ldquoholisticrdquo platform for building wireless ad hoc sensor networks and focus on its most representative and essential virtualization component: VUE<sup>2</sup> (the Virtual Underlay Emulation Engine). Its role is to provide a vehicle for authoritative emulation of complete networked applications before physically deploying the(More)
—Urban environments are notorious for high levels of noise and interference, particularly in their unlicensed radio bands. The interference patterns visible on a given channel depend on the particular devices competing for the spectrum. Meanwhile, the modern transceivers incorporated into wireless sensor network (WSN) nodes have the ability to measure the(More)
In the simple devices used for wireless sensor networks, the costs associated with a layered approach can be significant. Small-footprint operating systems have been developed by adopting non-traditional approaches to network abstractions while still aiming to simplify software development. In these approaches, some elements of modularity are valuable to(More)