Position-based routing is a promising technology for VANET. And location service is the fundamental component for the success of position-based routing. A map-based location service algorithm is proposed in this paper. It uses a predesigned hash function to map a node to a certain location, where location servers are recruited. Hence any node in the network can find location servers of others, ...

Posterior parietal cortex lesions have been associated with both hemispatial neglect and spatial-updating deficits. Currently, the relation between these processes remains poorly understood. We tested the ability of parietal patients with neglect to update remembered target locations during passive whole-body rotations. The rotations and manual pointing responses were executed with and without ...

We study the problem of the joint location of seismic events using an array of receivers. We show that locating multiple seismic events simultaneously is advantageous compared to the more traditional approaches of locating each event independently. Joint location, by design, includes estimating an uncertainty distribution on the absolute position of the events. From this can be deduced the dist...

In this paper, we propose a localization method using iterative angle of arrival (AOA) method sharing snapshots of coherent subarrays. The conventional AOA method is restricted in some applications because array antenna used for receivers requires many antennas to improve localization accuracy. The proposed method improves localization accuracy without increasing elements of antenna arrays, and...

The classical problem of tracking the location of mobile objects in a wireless sensor network is one that has drawn considerable attention from the sensor network research community for quite a long time, as this problem provides an abstraction for many applications that can be built over wireless sensor networks. However, many technical issues still exist in this field. In order to provide a b...

This paper provides a solution to guidance of multiple unmanned aerial vehicles that carry sensors for locating a detected emitter of radio frequency signals. Guidance in this paper refers to updating the state of each vehicle to the most desirable position and velocity, reachable within a given time for the location purpose. The vehicles can then be guided to the updated sensor states for furt...

All previously proposed position based routing algorithms for wireless ad hoc networks were based on forwarding the actual message along multiple paths toward an area where destination is hopefully located. The significant communication overhead can be avoided if the routing strategy is changed. We propose that the source node issues several search 'tickets' (each ticket is a 'short' message co...

In the present scenario location updating is main problem in mobile applications. Mobile clients will be spread based on location hierarchy. Updating all mobile clients’ information at single database server faces overhead problem. To overcome this, in our approach we are providing server hierarchy for load balancing. Mobile clients generally send continuous information to servers. But if movem...

IP paging aims to reduce power drain and signaling overhead of dormant mobile hosts and so to enhance the scalability of the mobile Internet. Previous IP paging schemes do not, however, scale well adhering to the static location update algorithm. This static approach accompanies signaling and computation overhead even with the costly optimization of the paging area. Excluding the shortcomings o...

This article presents an overview of privacy problems and solutions to date in location basedservices, with the emphasis on understanding location privacy issues, alternative models, andarchitectures. It concludes with an outlook in location privacy research and its impact on mobileInternet, pervasive computing, and geo-spatial data management. Privacy Risks in Location Based Servic...