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Localizability and accuracy are two fundamental problems in many range-based localization schemes for sensor networks. This poster addresses the two problems theoretically by introducing two new concepts: the effective degree and the lower bound of geometric dilution of precision (GDOP). We prove that the network is not localizable unless the average effective degree is greater than or equal to the...
In underwater sensor networks, localization is one of the most important issues because sensor nodes are considerably difficult to be deployed at determined locations. Since range-based schemes require additional device and precise time synchronization for measuring distances in underwater environments, range-free schemes are promising in the view point of energy consumption and implementation. Coarseness...
In this paper, we provide a study of applying location aware wireless sensor network system for tracking movements and gathering sensor data from sports team players. A set of system design requirements are developed that cover the design of the sensor network system, the hardware design of the mobile nodes, the design of the position algorithm, the design of communication protocols, and the design...
This article presents an indoor localization system based on Impulse-Radio Ultra-Wideband. A novel peak detection technique is proposed to be used for Round-Trip-Time ranging. Additionally, the accuracy and complexity of different positioning algorithms are studied. The effect of different configurations of the fixed and mobile transceivers on the accuracy is also analyzed. Simulations have been performed...
We propose a sensor positioning scheme for a wireless sensor network consisting of beacons as well as collaborative anchors (CA) to help sensors within a prescribed service area to locate themselves. We assume a robust performance is achieved in the sense that a prescribed location accuracy requirement is fulfilled within the service area. Under the assumption that the time-of-arrival and location...
Localization systems have been identified as a key issue to the development and operation of the Wireless Sensor Networks (WSN). Accurate localization algorithms are needed for a wide variety of WSN applications, and it is hard to get the precision solution by traditional node localization algorithm. In this paper, we propose a new technique for position estimation of nodes using Learning Automata...
We consider the problem of supporting continuous spatial queries in a new and challenging network environment, namely a Mobile Peer-To-Peer (MP2P) network. Specifically, we propose a distributed technique, called ExtRange, that can efficiently answer continuous moving range queries in a MP2P network. The two key ideas in ExtRange are extended range and safe period. For each query, ExtRange extends...
Fixed relaying is a concept which is becoming mature within the research community due to the advantages that it can provide for future network deployments. Mobile relaying, an extension of the fixed relaying concept, has lately been investigated to highlight a possible framework for its deployment alongside fixed relay strategies. This paper aims to present the way that mobiles relays can be used...
Rapid advances in the area of digital systems is an enabler for ubiquitous computing making devices smaller and smarter and paving the way for an interconnected digital world. The most influential digital technology that has changed the lives of so many people and made the interconnected world a possibility is undoubtedly the development of wireless cellular communications. In the early stages of...
An accurate real-time application which locates mobile users in an indoor environment is highly demanded in hospitals, warehouses, etc., provided that minor changes in their infrastructure are required. Most present-day location techniques require a great calibration effort, or special devices which are not cost-effective. Avoiding these needs, this paper implements an autonomous positioning technique...
A low-cost mobile sensor network structure with a sensing mechanism is presented to explore the border of unknown target areas effectively. At first, mobile sensors with GPS receivers are organized into groups called SensorGroup (SG) which works well for the detecting jobs. After that, an advanced structure called centralized sensor group (CSG) is proposed to further reduce the device cost since only...
Positioning is a crucial task in pervasive computing, aimed at estimating the user's positions to provide location-based services. In this paper, we study an interesting problem: when we wish to obtain hybrid positioning granularities in an office environment, how can we incorporate heterogeneous sensors to build an indoor positioning system with minimal human calibration effort? We propose a calibration-less...
In our daily life we frequently use mobile devices to interact with the people and things on the Internet. However, finding the right things when needed is getting difficult and frustrating. In this paper, we introduce a relatively new problem of non-collaborative personal interest mining using contexts and ratings available for items of interest. We present multi-step algorithms to extract personal...
Pervasive computing applications, which are location-aware systems becoming increasingly important as part of our daily life. Real-time position localization of moving objects in an indoor environment is an encouraging technology for realizing the vision of creating numerous novel location-aware services and applications in various market segments. An off the shelf development platform that uses radio...
Localization algorithms are required for indoor wireless sensor network (WSN) applications because the identification of real positions can upgrade the importance of sensing information. In this paper, we introduce a efficient algorithm which can improve the accuracy of location identification by employing jumper setting at each sensor. The proposed algorithm perform localization more accurately than...
The proliferation of communication and mobile computing devices and local-area wireless networks has cultivated a growing interest in location-aware systems and services. An essential problem in location-aware computing is the determination of physical locations. RFID technologies are gaining much attention as they are attractive solutions to indoor localization applications. In this paper, we propose...
RFID is an automatic identification technology that enables tracking of people and objects. This research focuses on improving context-awareness by associating locations to identities. We propose L-VIRT, an extension of our 3-D range- free localization method for RFID tags that uses additional mobile readers to refine its accuracy. Topological constraints are deduced from connectivity information...
Wireless sensor networks (WSNs) have been proposed for a multitude of location-dependent applications. To stamp the collected data and facilitate communication protocols, it is necessary to identify the location of each sensor. In this paper, we discuss the performance of a novel received signal strength indicator (RSSI) positioning scheme, which uses a generalized geometrical location algorithm to...
In this article, we present a content-based video search service for mobile device users. After taking a photograph, the user can upload it to our server, which will then return videos containing key frames that are similar to the uploaded picture. The proposed service demonstrates that the search application is feasible.
Wireless sensor networks have been used in proposed solutions to many important practical problems. A very important problem in many wireless sensor networks is localization, or the determination of geographical locations of the sensor nodes. In this work, we study the problem of range-free localization-or computing locations based only on the neighborhood information of nodes. These algorithms typically...
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