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The location information of sensor nodes is needed for location-based services and network management in wireless sensor networks. Among the many kinds of localization schemes researched to find the location of sensor nodes, a few some schemes presume the use of mobile beacons because using mobile beacons has many potentialities. In particular, a(More)
Underwater sensor networks (UWSNs) are considered a costeffective solution to ocean applications, such as the acquisition of natural resources in oceans, protection from underwater disasters, etc. These applications basically require location information of nodes to identify the venue of reported events. To locate more accurately the position of nodes,(More)
In large-scale sensor networks, localization with mobile beacons is one of the most efficient ways to deploy sensor nodes as well as locate them. Direct communication with mobile beacons has an advantage of improvement in location accuracy by enabling sensor nodes to measure distances to the mobile beacons. Thus, it is important to improve the accuracy in(More)
In underwater sensor networks (UWSNs), localization is an important issue and a challenging task due to harsh environments for people to access. In this paper, we propose a distributed algorithm to locate nodes deployed in 3-D space using long-range beacons floating on the sea surface. Long-range beacons allow underwater nodes directly to obtain reference(More)
This paper presents a bearings-only tracking (BOT) scheme based on distributed floating beacons in underwater sensor networks (UWSNs). Conventional BOT systems extract target-originated bearings in noisy measurements, locate and track targets based on the bearings in real time. We propose a tracking scheme by modifying BOT systems for UWSNs where a(More)
Recently, a fully-integrated embedded system becomes popular for portable devices due to the cost reduction and the low-power operation. To reduce the size of the imbedded program, some hardware techniques such as nop-beforeexecution and programmable-delay-slot are introduced in CoreA embedded processor [1]. However, the previous designs using Core-A(More)
Mobile cloud computing requires the efficient approach to access the outsourced data in public clouds due to resource scarceness of mobile devices. To this end, the outsourced data should be protected efficiently from being accessed in plaintext by unauthorized users and public clouds. User revocation should be appropriately managed to guarantee backward(More)
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