Mobile Terminal Location
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. RADIOLOCALIZAÇÃO DE TERMINAIS DE COMUNICAÇÕES MÓVEIS / RADIOLOCATION OF MOBILE COMMUNICATIONS TERMINALS
This work addresses the radiolocation problem of a moving terminal in a cellular mobile communications environment. New alternatives are developed for position estimation, assuming that the Time of Arrival (ToA) measurements obtained from radio link are corrupted by additive noise and have positive mean error during random periods of time due to the non-line
Publicado em: 2004
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2. RADIO-LOCALIZAÇÃO EM SISTEMAS DE TECNOLOGIA TDMA / RADIOLOCATION IN SYSTEMS OF TECHNOLOGY TDMA
Este trabalho é um estudo sobre radio-localização de terminais móveis em sistemas de tecnologia TDMA. Pela legislação americana e também pela extrema competitividade entre operadores de telefonia na conquista de novos mercados e de provisão de novos serviços, técnicas que permitam a localização do terminal móvel têm sido intensamente pesquisada
Publicado em: 2004
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3. ESTUDO E SIMULAÇÃO DE TÉCNICAS DE LOCALIZAÇÃO DE TERMINAIS EM AMBIENTES MICROCELULARES / INVESTIGATION AND SIMULATION OF TERMINAL LOCATION TECHNIQUESIN MICROCELLULAR SYSTEMS
The location of mobile terminals in mobile cellular systems has been receiving increasing attention in the last few years. This interest in focused not only in security aspects but also in the development of new services for commercial application. In this Dissertation a simulation environment for mobile stations location in microcellular systems was develop
Publicado em: 2003
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4. GEOGRAPHIC LOCATION OF MOBILE STATIONS IN CELLULAR SYSTEMS / LOCALIZAÇÃO GEOGRÁFICA DE ESTAÇÕES MÓVEIS EM SISTEMAS CELULARES
Em meados dos anos 90, após reconhecer que os serviços de emergência estavam inadequados, a FCC (Federal Communications Commission), órgão governamental dos Estados Unidos que regulamenta as atividades das operadoras de telecomunicações, determinou que todas as operadoras de telefonia móvel celular deveriam ser capazes de fornecer a posição geográ
Publicado em: 2001
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5. A new copia-like transposable element found in a Drosophila rDNA gene unit.
We have discovered a member of a new family of copia-like transposable elements inserted into the non-transcribed spacer between two ribosomal genes (rDNA). This family, which we call 3S18, consists of at least 15 elements which are scattered throughout the Drosophila melanogaster genome. The elements of this family are approximately 6.5 kb long and have 0.5
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6. Presence of a member of the Tc1-like transposon family from nematodes and Drosophila within the vasotocin gene of a primitive vertebrate, the Pacific hagfish Eptatretus stouti.
Molecular cloning of the vasotocin gene of a cyclostome, the Pacific hagfish Eptatretus stouti, reveals, in contrast to other known members of the vertebrate vasopressin/oxytocin hormone gene family, an unusual exon-intron organization. Although the location of three exons and two introns is conserved, an additional intron is present 5' of the coding region
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7. Structural organization of transposable element mdg4 from Drosophila melanogaster and a nucleotide sequence of its long terminal repeats.
A mobile dispersed genetic element, mdg4 , approximately 7.5 kilobases (kb) long has been cloned from D. melanogaster genome. Chromosomal bands have only few sites of mdg4 , but it always hybridizes to the chromocenter. The location of mdg4 varies among D. melanogaster strains. Blot hybridization shows that, in contrast to other mdg elements, mdg4 sequences
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8. Three-dimensional structure of phosphoenolpyruvate carboxylase: A proposed mechanism for allosteric inhibition
The crystal structure of phosphoenolpyruvate carboxylase (PEPC; EC 4.1.1.31) has been determined by x-ray diffraction methods at 2.8-Å resolution by using Escherichia coli PEPC complexed with l-aspartate, an allosteric inhibitor of all known PEPCs. The four subunits are arranged in a “dimer-of-dimers” form with respect to subunit contact, resulting in
The National Academy of Sciences.