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This paper addresses the target coverage problem in wireless sensor networks with adjustable sensing range. Communication and sensing consume energy, therefore efficient power management can extend network lifetime. In this paper, we consider a large number of sensors with adjustable sensing range that are randomly deployed to monitor a number of targets.(More)
This paper addresses the target coverage problem in wireless sensor networks with adjustable sensing range. Communication and sensing consume energy, therefore efficient power management can extend network lifetime. In this paper, we consider a large number of sensors with adjustable sensing range that are randomly deployed to monitor a number of targets.(More)
Recently, opportunistic routing (OR) has been widely used to compensate for the low packet delivery ratio of multi-hop wireless networks. Previous works either provide heuristic solutions without optimality analysis, or assume that unlimited retransmission is available for delivering a data packet. In this paper, we apply OR to a utility-based routing where(More)
Carpooling has long held the promise of reducing gas consumption by decreasing mileage to deliver co-riders. Although <i>ad hoc</i> carpools already exist in the real world through private arrangements, little research on the topic has been done. In this paper, we present the first systematic work to design, implement, and evaluate a carpool service, called(More)
A major concern in wireless sensor networks is to maximize network lifetime (in terms of rounds) while maintaining a high quality of services (QoS) at each round such as target coverage and network connectivity. Due to the power scarcity of sensors, a mechanism that can efficiently utilize energy has a great impact on extending network lifetime. Most(More)
—Opportunistic routing (OR) has received much attention as a new routing paradigm due to its efficient utilization of broadcasting and spacial diversity of the wireless medium. Although numerous OR algorithms and protocols have been proposed to apply to various environments and integrate with numerous techniques, as far as we know, none of the existing(More)
Due to resource scarcity, a paramount concern in ad hoc networks is to utilize the limited resources efficiently. The self-organized nature of ad hoc networks makes the social welfare based approach an efficient way to allocate the limited resources. However, the effect of instability of wireless links has not been adequately addressed in the literature. To(More)
<b>Introduction</b> Carbon Monoxide (CO) is a poisonous air pollutant produced from the incomplete oxidation of carbon during the combustion process. It has a direct effect on the human body due to its affinity for blood hemoglobin, which inhibits the absorption of oxygen to the blood. The formation of carboxyhemoglobin complex can profoundly affect human(More)
— Link and node reliability are important metrics in wireless ad hoc networks. Therefore, evaluating and quantifying reliability has become the cornerstone of research in this field. Many existing wireless ad hoc network routing algorithms assume the availability of precise reliability information. This, however, is an unrealistic assumption given the(More)