In recent years, wireless LAN technologies have experienced unprecedented growth, and new services and problems have occurred. In this paper, we propose a position estimation technique using directional antennas to assist the detection of wireless access points. Using an asymmetric model for estimation, our technique can radicalize probability distribution quicker than using a symmetric model. ...

Recent work from our laboratory demonstrates that both young and adult rats show a preference for directional responding over place navigation in the Morris water task. Based on these findings, previous studies on the postnatal development of spatial learning have most likely assessed the ontogeny of directional responding instead of true place navigation. Here, we examined the development of d...

Structure From Motion Using Omni-directional Vision and Certainty Grids. (August 2004) Steven Rey Ortiz, B.S., Texas A&M University Chair of Advisory Committee: Dr. Ricardo Gutierrez-Osuna This thesis describes a method to create local maps from an omni-directional vision system (ODVS) mounted on a mobile robot. Range finding is performed by a structure-from-motion method, which recovers the th...

Due to their advantages, omni-directional mobile robots have found many applications especially in robotic soccer competitions. Despite recent advances, effective control and self-localization of omni-directional mobile robots remain as important and challenging issues. In this work, a practical approach for control and self-localization of an omni-directional robot is proposed. For this purpos...

In this paper, the integration of directional antennas in a room-level received signal strength (RSS) fingerprinting-based indoor localization system (ILS) is studied. The sensor reader (SR), which is in charge of capturing the RSS to infer the tag position, can be attached to an omnidirectional or directional antenna. Unlike commonly-employed omnidirectional antennas, directional antennas can ...

Different models for computing the spatial relations have been developed in the last decade. Separate methods are used for computing topological, directional and distance relations. These models have also been extended in fuzzy domains based on fuzzy or vague objects and less attention has been paid to fuzzy relations. In this paper 8 fuzzy topological relations are computed with the help of 1D...

Spatio-temporal prepositions like hasta ‘until’ find crucially distinct uses across Spanish varieties. In many cases, disallowed in more restrictive variants alternate nontrivially with canonical P distribution, raising pressing questions on spatiotemporal prepositions, lexicalized denotational properties, and their potential exploitation complex semantic representations. Central American varie...

We study the directional far-field response of a spherical nanoantenna via engineering the plasmonic nanosphere's distance, size, and material. A unified pattern synthesis approach based on the T-matrix method and the particle swarm optimization is proposed for the directional beamforming of the nanoantenna. The angular response of the directional nanoantenna is very sensitive to the material c...