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With the proliferation of sensors, specifically those capable of providing positional estimates, it is now possible to build large sensor networks for the purpose of tracking objects within indoor environments. A key component of building such indoor tracking systems, is the ability to properly select a subset of these available sensors for the purpose of tracking. Often sensors do not afford the...
Wireless sensor networks (WSNs) face a number of security challenges that can compromise their operation. A typical security attack that can be launched by an adversary, in order to affect the network's communication, is the selective forwarding attack. If compromisation occurs, it is essential to recover the network to a stable state. In the context of mission-critical WSNs the challenge is not just...
While personal data privacy is threatened by online social networks, researchers are seeking for privacy protection tools and methods to assist online social network providers and users. In this paper, we aim to address this problem by investigating how to quantitatively evaluate the privacy risk, as a function of people's awareness of privacy risks as well as whether their friends can be trusted...
Typical sensor networks are formed by low-end, battery operated devices, which rely on low-energy communication technologies, such as Bluetooth, Zigbee and ANT+, due to their energy efficiency. On the other hand, sensor networks increasingly need to be connected to the Internet, which implies adaptations of the TCP/IP stack to fit such wireless technologies. These adaptations bring additional complexity...
In this article we analyze the diffusion normalized least mean square (NLMS) and its set-membership version (SMNLMS) diffusion algorithms in a scenario where sensor nodes are subjected to different noise variances. We show through simulation that the SM-NLMS is a more robust algorithm in such condition, in addition to the provided reduced energy consumption. We also show that, in such context, the...
The advancements in communications and embedded systems have led to the proliferation of wireless sensor and actuator networks (WSANs) in a wide variety of application domains. One important key of many such WSAN applications is how to configure/program functionalities after deployment. Some application domains even require that sensor nodes be deployed in harsh environments (e.g., refineries), where...
In network protocol engineering resiliency is still a relatively new and somewhat ill-defined concept. Insofar only few studies attempt to define some metric to measure and thus quantify resiliency. In this paper we propose to quantify network resiliency along multiple parameters and further we introduce a two dimensional graphical representation with multiple axes forming an equiangular polygon surface...
As the number of application areas for wireless technologies grows, the need for providing both predictable and reliable communication over wireless networks becomes apparent. Cooperative embedded systems for industrial automation are one example of systems with these needs. Previously, we developed a framework for reliable real-time communication in a single-hop wireless network with a logical star...
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