In TREC 2003, IRIT improved the strategy that was introduced in TREC 2002. A sentence is considered as relevant if it matches the topic with a certain level of coverage. This coverage depends on the category of terms used in the texts. Different types of terms have been defined: highly relevant, scarcely relevant, nonrelevant and highly non-relevant. With regard to the novelty part, a sentence ...

in wireless sensor networks (wsns), localization algorithms could be range-based or range-free. the approximate point in triangle (apit) is a range-free approach. we propose modification of the apit algorithm and refer as modified-apit. we select suitable triangles with appropriate distance between anchors to reduce pit test errors (edge effect and non-uniform placement of neighbours) in apit a...

vaccination considered as one of the most cost-effective health interventions worldwide  through prevention and control of many serious childhood diseases (1). it is estimated  global coverage of  dose 3 of diphtheria, tetanus, and pertussis (dtp3)among children one year old has been 86% in 2014 (by range from 77% to 96%  in african region and western pacific region; respectively) (2). globally...

We introduce Unmanned Vehicles (UVs) to aid the operation of the mobile backbone based wireless ad hoc networks, and serve to significantly enhance the construction of a capable backbone network. We consider two types of UVs: Unmanned Airborne Vehicles (UAVs) and Unmanned Ground Vehicles (UGVs). The UAVs may orbit at different layers (and altitudes), communicating to ground access stations. The...

In this paper, we provide a performance analysis for practical unmanned aerial vehicle (UAV)-enabled networks. By considering both line-of-sight (LoS) and non-line-of-sight (NLoS) transmissions between aerial base stations (BSs) and ground users, the coverage probability and the area spectral efficiency (ASE) are derived. Considering that there is no consensus on the path loss model for studyin...

Recent moderate-sized, but strongly-felt, earthquakes in eastern and central North America have highlighted the important role of the earth’s attenuation structure in estimating and predicting local and regional ground motions. Over the past several years, we have been developing methods to use the amplitudes of regional phases Pn, Pg, Sn, and Lg to invert for the crust and upper mantle attenua...

in 1974, the world health organization (who) established the expanded program on immunization (epi) to ensure that all children have access to routinely recommended vaccines. since then, global coverage with the four core vaccines (bacille calmette guérin vaccine [for protection against tuberculosis], diphtheria-tetanus-pertussis vaccine [dtp], polio vaccine, and measles vaccine) has increased ...

Recent advances in computer science and electronics have greatly expanded the capabilities of unmanned aerial vehicles (UAV) in both defense and civil applications, such as moving ground object tracking. Due to the uncertainties of the application environments and objects' motion, it is difficult to maintain the tracked object always within the sensor coverage area by using a single UAV. Hence,...

Satellite data are essential for monitoring clouds and radiative fluxes where ground-based instruments are unavailable. On April 24, 2003, the ninth geostationary operational environmental satellite (GOES-9) began operational coverage of the Tropical Western Pacific (TWP), replacing the failing fifth geostationary meteorological satellite (GMS-5). The GOES-9 imager provides the opportunity for ...

A new transmission technology, based on IEEE 802.16-2009 (WiMAX), is currently being developed for airport surface communications. A C-band spectrum allocation at 5091 to 5150 MHz has been created by International Telecommunications Union (ITU) to carry this application. The proposed technology, known as AeroMACS, will be used to support fixed and mobile ground to ground applications and servic...