WorldWideScience

Sample records for gps primeros resultados

  1. Primeros resultados sobre el estudio de oscilaciones no radiales

    Science.gov (United States)

    Córsico, A.; Benvenuto, O. G.

    En el Observatorio de La Plata se ha comenzado a elaborar un código de pulsaciones el cual resuelve el problema de las oscilaciones no radiales en el caso adiabático. Dicho código está basado en la técnica de diferencias finitas ampliamente usado en cálculos de estructura y evolución estelar. En este trabajo se presentan los primeros resultados encontrados aplicando el código mencionado al caso de una polítropa de índice n=3. Se presentan los valores de las autofrecuencias y las autofunciones para diferentes modos de pulsación de dicha configuración politrópica. En un futuro próximo, se aplicará este programa al estudio de las pulsaciones no radiales de estrellas enanas blancas.

  2. Primeros resultados para la reconstrucción dendroclimática de Canarias

    Directory of Open Access Journals (Sweden)

    Carlos L. Santana Jubells

    2013-11-01

    Full Text Available La aplicación de la Dendrocronología a poblaciones canarias de Pinus canariensis Smith, taxón que hasta el momento no había sido objetivo de esta ciencia, y la obtención de los primeros resultados positivos en la comparación cruzada de series de crecimiento, abren las puertas a una reconstrucción de las variables climáticas precipitación y temperatura del pasado en el Archipiélago. Entre las muchas aplicaciones que es posible derivar de dicha reconstrucción, centra el interés de la Prehistoria el conocimiento, desde una perspectiva diacrónica, de una parte fundamental del entorno ecológico en el que se desarrollan de las poblaciones pehispánicas de Canarias, como vía válida para enriquecer la interpretación de ciertas transformaciones culturales. Los cambios que se operan en la isla de La Palma en el tránsito entre las fases cerámica III y IV, pueden ser interpretados como claro exponente de la intima relación que existe entre el desarrollo de los sistemas culturales y las alteraciones de su marco medioambiental.The application of Dendrochronology to populations of Pinus canariensis Smith from the Canary Islands -species never studied by this science before- and the first positive results in cross-dating of tree-ring series, are achievements that lead to the future reconstruction of the past climatic variables precipitations and temperatures in the Canaries. Among the many applications derived from this climatic reconstruction, the knowledge from a dicahronic perspective if a fundamental piece of the ecological environment in wich the Canarian prehispanic peoples developed will provide Prehistory with a powerful tool to enrich the interpretation of certain cultural phenomena. The changes that took place in La Palma in the transition between the ceramic phases II and IV, can be interpreted as a clear example of the close relationship existing between development of cultural systems and modifications in its environmental frame.

  3. Posibilidades estructurales de materiales a base de cal como conglomerante: primeros resultados

    Directory of Open Access Journals (Sweden)

    Estrada, Enrique

    1986-11-01

    Full Text Available Lime is a plentiful material which production combine a very accessible technology with the advantage that it must be prepared in little disperse plants, so that the transport charges can be reduced to the minimum. This work expound the possibility to obtain concretes with structural purposes, for housing of scarce height, of easy obtention, basically from flying ashes or rice husk ashes, varying its proportions and fineness degree and studying the initial and final resistance. Good results have been obtained mainly with rice husk ashes and lime, with 60 days resistance higher than 15 Mpa.La cal es un material abundante y cuya producción suma a una tecnología muy accesible la ventaja de poder materializarse en pequeñas plantas dispersas, para poder reducir al mínimo la componente de costo debida al transporte. En el presente trabajo se ha planteado la posibilidad de obtener hormigones con fines estructurales, para viviendas de baja altura y que sean de fácil obtención, a base de cal y cenizas volantes o cenizas de cascara de arroz, variando sus proporciones, grados de finura y estudiando la influencia de distintos factores en la resistencia inicial y final. Se han obtenido buenos resultados, principalmente con ceniza de cascara de arroz y cal con resistencias a 60 días superiores a los 15 MPa.

  4. El Conjunto Rupestre de Bacinete, Sierra del Niño, Los Barrios, Cádiz : primeros resultados

    Directory of Open Access Journals (Sweden)

    Mónica Solís Delgado

    2004-01-01

    Full Text Available El conjunto de abrigos decorados con pinturas postpaleolíticas que componen Bacinete, pertenecientes al término municipal de Los Barrios, constituye una de las estaciones más importantes de toda la provincia de Cádiz. Por temática y estilo, se sitúa en un contexto postpaleolítico de primeros productores, y se adscribe estilísticamente al horizonte esquemático.The shelters decorated with postpalaeolithic paintings that are found in the village area of Los Barrios and that comprise Bacinete, it is a important station of this kind in the whole of Cádiz province. By its subject and style it is framed in a postpalaeolithic context of first producers and stylistically speaking it ascribes itself to the schematic horizon.

  5. Entre desierto y quebrada. Primeros resultados de las excavaciones realizadas en el abrigo de Tomayoc (Puna de Jujuy, Argentina

    Directory of Open Access Journals (Sweden)

    1997-01-01

    Full Text Available ENTRE DÉSERT ET QUEBRADA. PREMIERS RESULTATS DES FOUILLES REALISEES DANS L'ABRI DE TOMAYOC (PUNA DE JUJUY, ARGENTINE. Dans cet article sont exposés les principaux résultats des fouilles réalisées de 1987 à 1990 dans l’abri de Tomayoc (Sierra de Aguilar, Jujuy, Argentine. La chronologie de l’occupation, qui s’étend de 4250±50 BP à 550±50 BP, est présentée et discutée, de même que la stratigraphie. En dépit des effets prononcés de l’érosion ayant fortement affecté les dépôts archéologiques, les vestiges plus ou moins importants de huit sols d’occupation ont été mis au jour par la méthode du “décapage”. Ces sols résiduels, de superficie variable, ont pu être regroupés en quatre phases d’occupation, respectivement situées dans les périodes Archaïque (phases I et II “Temprano” (Phase III et “Tardio” (Phase IV, et définies à partir de critères chronologiques, stratigraphiques et typologiques. L’analyse paléoethnologique de chacun des sols d’occupation mis au jour a été réalisée. Parmi les résultats les plus importants, on note la présence d’un camélidé domestiqué (l’alpaca dès l’Archaïque (Phase II : 3480±40 - 3250±60 BP et, durant le “Temprano” (Phase III, la présence de céramique associée à une date de 2950±50 BP. En este artículo están expuestos los principales resultados de las excavaciones realizadas entre 1987 y 1990 en el abrigo de Tomayoc (Sierra de Aguilar, Jujuy, Argentina. La cronología de la ocupación, que va desde 4250±50 BP hasta 550±50 BP, es presentada y discutida, así como la estratigrafía. A pesar de los efectos pronunciados de la erosión que afectaron fuertemente los depósitos arqueológicos, los vestigios de ocho pisos de ocupación fueron evidenciados por el método del decapage. Estos pisos, de superficie variable, han sido reagrupados en cuatro fases de ocupación ubicadas respectivamente en el Período Arcaico (Fase I y II, el Período

  6. Primeros resultados de la aplicación y evaluación de un programa de educación parental: “Construir locotidiano”

    Directory of Open Access Journals (Sweden)

    Susana Torío López

    2012-07-01

    Full Text Available Normal.dotm 0 0 1 186 1065 Universidad de Salamanca 8 2 1307 12.0 0 false 18 pt 18 pt 0 0 false false false /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin;} En este trabajo se presentan los primeros resultados obtenidos en  la aplicación  y evaluación de un  programa de educación parental, “Construir lo cotidiano”, puesto en  marcha durante el presente curso académico en cuatro centros educativos en los niveles de Educación Infantil y Primaria del Principado de Asturias.  En el estudio participan 34 madres y padres (16 parejas de familias nucleares y dos familias monoparentales. La implementación del programa no ha estado exenta de dificultades, en especial, la captación de familias ante el requisito de la presencia voluntaria de ambos miembros de la pareja. Los resultados de la evaluación ponen de manifiesto efectos positivos de la intervención en las familias participantes, observándose cambios a corto plazo tanto en las actitudes, preferencias y creencias que la familia posee sobre los roles sexuales, como en el comportamiento respecto al reparto del trabajo doméstico (tareas del hogar, cuidado de los hijos e hijas y trabajo emocional que han permitido el buen funcionamiento familiar, a la vez que se ha potenciado la colaboración familiar enseñando a niños y niñas a participar en dichas responsabilidades. Se presentarán y discutirán datos de la

  7. Primeros resultados del trabajo de investigación sobre la tierra como material de construcción, en el IETCC

    Directory of Open Access Journals (Sweden)

    Salas, Julián

    1986-02-01

    Full Text Available This work presents the first results from the researches based in the up to date earth constructions, taking into account its interest according to the new possibilities they offer, considering the energetic crisis and, fundamentally, the need to use local resources and feasible solutions in developing countries. Thinking about the main problems of this kind of construction, its short capacity of response to climate conditions -critical in humid environment- we pretend to establish valid parameters for mechanical behaviour so as for resistance under rain. After a first classification phase and soil identification, series of samples with different dosage, cement, fly ash and other chemical aggregates, were made, establishing relational parameters between different form and resistant behaviour rates. From those dosages, behaviour under dripping and in winter atmosphere in Madrid, were studied.El trabajo recoge los primeros resultados de la investigación basada en la nueva realidad de las construcciones a base de tierra, teniendo presente su interés ante las nuevas posibilidades que ofrece a la luz de la crisis energética y, fundamentalmente, por la necesidad de utilización de recursos locales y soluciones viables en países en vías de desarrollo. Considerado entre los principales problemas de este tipo de construcciones su limitada capacidad de respuesta ante los agentes atmosféricos -crítica en ambientes húmedos- se pretende establecer parámetros válidos tanto para el comportamiento mecánico, como para su aptitud frente al agua. Superada una primera fase de clasificación, e identificación de los suelos, se han realizado series de probetas con distintas dosificaciones de cal, cemento, cenizas volantes y otros aditivos químicos, estableciendo parámetros de relación entre distintos coeficientes de forma y comportamiento resistente. De estas dosificaciones se ha estudiado su comportamiento frente a ensayo de goteo y exposici

  8. Analisis y primeros resultados de una innovación fundamentada de un curso de tecnociencias en ingeniería.

    Directory of Open Access Journals (Sweden)

    Jaime Corena Prra

    2010-10-01

    Full Text Available En este trabajo se presenta un proceso de transformación fundamentada de la enseñanza habitual de las tecnociencias en la universidad y algunos de los resultados iniciales obtenidos que aportan evidencias sobre la mejora producida en el aprendizaje de los estudiantes de tercer curso de ingeniería.

  9. Miniesternotomía inferior. Revisión de los resultados quirúrgicos y cosméticos en nuestros 100 primeros casos

    Directory of Open Access Journals (Sweden)

    Maria Garcia-Vieites

    2015-05-01

    Discusión: La miniesternotomía inferior permite una reparación segura y precisa de una selección de defectos cardiacos congénitos. Este abordaje también proporciona un resultado cosmético y una satisfacción del paciente excelentes y podría ser de elección para esta población.

  10. Resultados de los primeros análisis esporopolínicos en la cueva del níspero (Orbaneja del Castillo, Sedano, Burgos)

    OpenAIRE

    Guillén Oterino, Antonio

    2009-01-01

    En este pequeño informe se da cuenta de los resultados obtenidos en los análisis palinológicos de 8 muestras tomadas en la Cueva del Níspero durante la campaña de 1987. Los sedimentos estudiados se corresponden con los tres niveles inferiores, IV, V y VI situados entre 1,48 m. y 2,25 m. de profundidad con respecto al nivel 0 de excavación.

  11. Primeros resultados de la evaluación de un programa de Atención Temprana en síndrome de Down

    Directory of Open Access Journals (Sweden)

    María Auxiliadora Robles Bello

    2016-06-01

    Full Text Available El presente estudio pretende comprobar si existen diferencias en 29 niños con síndrome de Down (17 niños y 12 niñas con edades comprendidas entre 10 y 12 meses (M=11,58; DT=1,74, 14 de los cuales no reciben tratamiento en Atención Temprana. Se utiliza el Programa para la Estimulación del Desarrollo Infantil-PEDI de Zulueta y Mollá (2006. Se intentan cuantificar los logros obtenidos (uno experimental y otro control en el área motora, área perceptivo-cognitiva, área socio-comunicativa y área de la autonomía o de socialización tras la aplicación del programa. Los resultados muestran diferencias entre ambos grupos en tres de las cuatro áreas de evaluación, en concreto en el área perceptivo-cognitiva (t = 3,26; p< 0,05; d= 0,95, lenguaje (t = 3,54; p< 0,05; d = 0,98 y autonomía/socialización (t = 4,90; p< 0,01; d = 0,81. Se discuten los resultados obtenidos y se plantean limitaciones de este estudio y perspectivas futuras para investigadores y profesionales que trabajan con niños de 0 a 6 años con síndrome de Down.

  12. Resultados de los primeros casos de craneoplastia con tela de titanio y colgajo galeal bipediculado postraumatismo craneano Resultados dos primeiros casos da cranioplastia com tela de titânio e retalho galeal bipediculado pós-trauma crânio-encefálico Results of first cases of craneoplasty with titanium mesh and galeal bipediculated flap after craneal trauma

    Directory of Open Access Journals (Sweden)

    L. Dos Santos Fonseca

    2010-03-01

    Full Text Available La causa más frecuente de una solución de continuidad de los huesos de la calota craneana es un traumatismo craneoencefálico grave. La reparación de la misma es lo que conocemos como craneoplastia. El objetivo de nuestro artículo es presentar nuestros primeros resultados de craneoplastia con tela de titanio y colgajo galeal bipediculado. A través de un estudio retrospectivo, descriptivo, tipo serie de casos, relatamos los resultados de nuestra experiencia en craneoplastia con tela de titanio y colgajo sobre 10 pacientes operados entre Enero y Octubre de 2007, tras valoración con Tomografía Computerizada, de los cuales el 90% fueron de sexo masculino y con una edad media de 29,9 años. El tiempo medio de internamiento hospitalario fue de 10,3 días. Tuvimos un caso de complicación y una reintervención por desplazamiento de la tela de titanio a los 4 meses. Todos los pacientes quedaron satisfechos con los resultados. Como conclusión, la craneoplastia con tela de titanio asociada a colgajo galeal bipediculado es un procedimiento eficaz y viable dentro de la red pública hospitalaria.A falta de continuidade entre ossos da calota craniana é mais frequentemente causada por trauma crânio-encefálico grave. A reparação dessas deformidades é conhecida como cranioplastia. Objetivo: Avaliar os resultados dos primeiros casos da cranioplastia com tela de titânio e retalho galeal bipediculado. Por meio de estudo retrospectivo, descritivo, tipo série de casos, relatam-se os resultados de cranioplastia com tela de titânio e retalho a que 10 pacientes foram submetidos, entre Janeiro a Outubro de 2007, após avaliação por tomografia computadorizada, sendo 90% do sexo masculino, com média de idade de 29,9 anos. O tempo médio de internamento foi de 10,3 dias. Houve uma complicação e uma reoperação por deslocamento da tela após quatro meses. Todos os pacientes ficaram satisfeitos com os resultados. Conclusão: A cranioplastia com tela de

  13. COLECCIONES ANTIGUAS, DATOS NUEVOS: PRIMEROS RESULTADOS DEL ANÁLISIS DE LAS COLECCIONES BIOARQUEOLÓGICAS DEL HUMEDAL DEL PARANÁ INFERIOR / Old collections, new data: first results of the analysis of the bioarchaeological collections of the Lower Parana We

    Directory of Open Access Journals (Sweden)

    Bárbara Pamela Mazza

    2015-06-01

    Full Text Available Durante fines del siglo XIX y principios del siglo XX tuvieron lugar varias exploraciones y excavaciones en sitios arqueológicos del humedal del Paraná inferior, originando en consecuencia un gran acervo de materiales bioarqueológicos, entre otros, depositados hoy en día en el Museo de la Plata de la Universidad Nacional de La Plata y en el Museo Etnográfico de la Universidad de Buenos Aires. Si bien algunos de los resultados derivados de aquellos trabajos de campo fueron publicados, otros permanecen inéditos. El objetivo de este trabajo es dar a conocer algunas características de dichas colecciones bioarqueológicas a través del análisis de 252 individuos que las conforman. En este sentido, procedimos a la determinación sexual y estimación etaria de la muestra y al registro de variables tafonómicas, este último con el fin de poder identificar el posible contexto de inhumación de donde provienen dichos individuos. A partir de este análisis y siguiendo los datos publicados se discriminaron entre inhumaciones en contacto directo con la tierra o en urnas. A su vez, se dio cuenta de una segmentación espacial en base a categorías de sexo y edad para algunos sitios, como así también de la presencia de adornos personales de metal, ocre y marcas de corte en algunos huesos. De esta manera, esperamos resaltar el valor que tienen las colecciones de museos como así también contribuir y ampliar nuestro conocimiento sobre las características de las poblaciones prehispánicas de la región.  Abstract  At the end of the 19th and beginning of the 20th century several explorations and excavations took place in archaeological sites at the lower Parana wetland, giving rise, among others, to a vast body of bioarchaeological remains, currently deposited at the Museo de la Plata de la Universidad Nacional de La Plata and at the Museo Etnográfico de la Universidad de Buenos Aires. While some of the results from those field works were

  14. “Building daily life” parental education program: First results of its implementation and evaluation Primeros resultados de la aplicación y evaluación de un programa de educación parental: “Construir locotidiano”

    Directory of Open Access Journals (Sweden)

    Susana Torío López

    2012-07-01

    cm 5.4pt; mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin;} En este trabajo se presentan los primeros resultados obtenidos en  la aplicación  y evaluación de un  programa de educación parental, “Construir lo cotidiano”, puesto en  marcha durante el presente curso académico en cuatro centros educativos en los niveles de Educación Infantil y Primaria del Principado de Asturias.  En el estudio participan 34 madres y padres (16 parejas de familias nucleares y dos familias monoparentales. La implementación del programa no ha estado exenta de dificultades, en especial, la captación de familias ante el requisito de la presencia voluntaria de ambos miembros de la pareja. Los resultados de la evaluación ponen de manifiesto efectos positivos de la intervención en las familias participantes, observándose cambios a corto plazo tanto en las actitudes, preferencias y creencias que la familia posee sobre los roles sexuales, como en el comportamiento respecto al reparto del trabajo doméstico (tareas del hogar, cuidado de los hijos e hijas y trabajo emocional que han permitido el buen funcionamiento familiar, a la vez que se ha potenciado la colaboración familiar enseñando a niños y niñas a participar en dichas responsabilidades. Se presentarán y discutirán datos de la parte del postest relativa al grado de satisfacción y utilidad del programa.

  15. Hacking GPS

    CERN Document Server

    Kingsley-Hughes, Kathie

    2005-01-01

    * This is the "user manual" that didn't come with any of the 30 million GPS receivers currently in use, showing readers how to modify, tweak, and hack their GPS to take it to new levels!* Crazy-cool modifications include exploiting secret keycodes, revealing hidden features, building power cords and cables, hacking the battery and antenna, protecting a GPS from impact and falls, making a screen protector, and solar-powering a GPS* Potential power users will take the function and performance of their GPS to a whole new level by hacking into the firmware and hacking into a PC connection with a GPS* Fear not! Any potentially dangerous mod (to the device) is clearly labeled, with precautions listed that should be taken* Game time! Readers can check out GPS games, check into hacking geocaching, and even use a GPS as a metal detector

  16. Los Primeros Auxilios en la escuela

    OpenAIRE

    Gas Ferrando, David; Safont Babiloni, David

    2015-01-01

    Treball Final de Grau en Mestre o Mestra d'Educació Primària. Codi: MP1040. Curs acadèmic 2014-2015 Los primeros auxilios son los cuidados que podemos darle a una persona que acaba de tener un accidente y tratamos de mejorar su salud mientras llega la asistencia sanitaria. Por ello, es de vital importancia tener unas nociones básicas sobre estos, con el fin de saber cómo debemos actuar ante una situación de accidente. La mejor manera de que toda la población, adquiera conocimie...

  17. Posibilidades estructurales de materiales a base de cal como conglomerante: primeros resultados

    OpenAIRE

    Estrada, Enrique; Barbero, José Miguel

    1986-01-01

    La cal es un material abundante y cuya producción suma a una tecnología muy accesible la ventaja de poder materializarse en pequeñas plantas dispersas, para poder reducir al mínimo la componente de costo debida al transporte. En el presente trabajo se ha planteado la posibilidad de obtener hormigones con fines estructurales, para viviendas de baja altura y que sean de fácil obtención, a base de cal y cenizas volantes o cenizas de cascara de arroz, variando sus proporciones, grados de finur...

  18. Experimental installation of refrigeration solar-first results; Instalacion experimental de refrigeracion solar-primeros resultados

    Energy Technology Data Exchange (ETDEWEB)

    Moone, C.; Guallar, J.; Alonso, S.; Palacin, F.

    2008-07-01

    In this article they are and the first results of an installation of solar refrigeration composed by a field of flat solar collector are analysed and absorption chillers of simple effect (BrLi-H{sub 2}O), used to give cold to a gymnasium of the university sport pavilion. The data correspond to the registered experimental values during the summer of 2007 (months of June, Julio and August). (Author)

  19. Optimization procedures in mammography: First results; Procesos de Optimizacion en Mamografia. Primeros Resultados

    Energy Technology Data Exchange (ETDEWEB)

    Espana Lopez, M. L.; Marcos de Paz, L.; Martin Rincon, C.; Jerez Sainz, I.; Lopez Franco, M. P. [Hospital Universitario de La Princesa. Madrid (Spain)

    2001-07-01

    Optimization procedures in mammography using equipment with a unique target/filter combination can be carried out through such diverse factors as target optical density, technique factors for exposure, screen film combination or processing cycle, in order to obtain an image adequate for the diagnosis with an acceptable risk benefit balance. Diverse studies show an increase in the Standardised Detection Rate of invasive carcinomas with an increase in the optical density among others factors. In our hospital an optimisation process has been established, and as previous step, the target optical density has been increased up to 1,4 DO. The aim of this paper is to value the impact of optical density variation as much in the quality of image as in the entrance surface dose and the average dose to the glandular tissue, comparing them with the results obtained in a previous study. The study has been carried out in a sample of 106 patients, with an average age of 53,4 years, considering 212 clinical images corresponding to the two projections of a same breast with an average compressed thickness of 4,86 cm. An increase of 16,6% on the entrance surface dose and 18% on the average dose to the glandular tissue has been recorded. All the clinical images has been evaluated for the physician as adequate for diagnosis. (Author) 16 refs.

  20. GPS Composite Clock Analysis

    OpenAIRE

    Wright, James R.

    2008-01-01

    The GPS composite clock defines GPS time, the timescale used today in GPS operations. GPS time is illuminated by examination of its role in the complete estimation and control problem relative to UTC/TAI. The phase of each GPS clock is unobservable from GPS pseudorange measurements, and the mean phase of the GPS clock ensemble (GPS time) is unobservable. A new and useful observability definition is presented, together with new observability theorems, to demonstrate explicitly that GPS time is...

  1. Chikungunya en la República Dominicana: lecciones aprendidas en los primeros seis meses

    Directory of Open Access Journals (Sweden)

    Raquel Pimentel

    2014-11-01

    Full Text Available La epidemia de chikungunya en la República Dominicana se inició en febrero de 2014. En los primeros seis meses se registraron 429 421 casos, que representaron 65% de todos los notificados a la Organización Panamericana de la Salud por 33 países y territorios de la Región de las Américas. Esta epidemia se ha transmitido con rapidez en dicho país y ha demandado una intensa respuesta intersectorial, que ha liderado el Ministerio de Salud Pública y, especialmente, el Sistema Nacional de Vigilancia Epidemiológica y la red de los servicios de salud. Considerando que afectará a miles de personas, el objetivo de este artículo es describir las actuaciones realizadas y compartir los resultados y las lecciones aprendidas durante estos primeros meses con los ministerios de salud y los profesionales de los países de la Región para ayudarles a preparar una respuesta adecuada para afrontarla de forma efectiva y eficiente.

  2. De GPS al mapa

    Directory of Open Access Journals (Sweden)

    Esteban Dörries

    2016-03-01

    Full Text Available Las coordenadas Lambert obtenidas a partir de mediciones con equipos GPS de mano, llamados a veces navegadores, en ciertos casos confunden al usuario, por diferir claramente de su posición real al ser graficadas en un mapa del Instituto Geográfico Nacional (IGN: Esto puede resolverse con suficiente exactitud mediante una transformación de Molodensky, seguida de la correspondiente proyección cartográfica. Sin embargo, los tres parámetros necesarios para la transformación, supuestamente válidos para Costa Rica, se encuentran en muchas variantes y producen obviamente resultados diferentes. En este trabajo se analizan los fundamentos del problema y sus posibles soluciones, culminando con un estudio comparativo de ocho casos, que permite seleccionar los valores más adecuados para los parámetros.

  3. GPS & Roadpricing

    DEFF Research Database (Denmark)

    Zabic, Martina

    2005-01-01

    den enkelte bil med en computer, der ved hjælp af signaler fra satellitter, kan bestemme bilens placering på vejnettet. Herved kan bilens computer ved hjælp af elektroniske vejkort udregne kilometertaksten det pågældende sted, således at det skyldige beløb enten trækkes direkte eller akkumuleres til...... estimeringskvaliteten af positionen, som specielt ses når bilerne accelererer, deaccelererer og drejer hurtigt i sving m.m. Hver GPS-baseret observations nøjagtighed afhænger af antallet af satellitter inden for ”sigt”, kvaliteten af hvert signal (HDOP) og den retning satellitterne befinder sig i forhold til enheden og...

  4. Escala de valoración de la conducta violenta y riesgo de reincidencia (EVCV-RR): primeros resultados

    OpenAIRE

    Jiménez Gómez, Fernando; Sánchez Crespo, Guadalupe; Merino Barragán, Vicente; Ampudia Rueda, Amada

    2010-01-01

    El objetivo de este estudio es la elaboración de una Escala que, basada en el HCR-20 y el PCL-SV, y con una estructura de pesos ponderativos de sus ítems, pueda ayudar a los psicólogos a predecir y evaluar la conducta violenta y el riesgo de reincidencia. Con un diseño cuasi experimental se ha analizado la conducta de forma significativa, las puntuaciones medias obtenidas por los dos grupos con un buen índice de Cohen (d = 1,70)

  5. Estudio de la prevalencia de un tercer conducto en primeros premolares superiores mediante diafanización

    Directory of Open Access Journals (Sweden)

    Katherine Stephanie De la Rosa Fernández

    2016-09-01

    Full Text Available Existen fracasos endodónticos que son relacionados por diferentes causas como: obturación incompleta, filtración coronal y fallos por parte del clínico en identificar o localizar los conductos radiculares y sus ramificaciones. Por este motivo, es básico la noción de la anatomía interna dental y sobre todo es importante tener en cuenta las variaciones que pueden existir en las distintas piezas dentales. Objetivo: El propósito del presente estudio es conocer la cantidad de conductos existentes en los primeros premolares superiores y saber si existe el tercer conducto en dichas piezas. Materiales y métodos: Se utilizaron 100 primeros premolares superiores donados por la Cátedra de Endodoncia de la Facultad de Odontología de la Universidad Central del Ecuador, los cuales fueron divididos en tres grupos según la cantidad de raíces que presentaban y sometidos a diafanización para poder observar su morfología interna. Resultados: Se encontró en la muestra de dientes evaluados la presencia de tres conductos en el 7%, la presencia de dos conductos en el 72% y de un conducto en el 21%. Conclusiones: Los primeros premolares superiores presentan uno, dos y tres conductos. La presencia de tres conductos tiene una baja prevalencia.

  6. Otosclerose: resultados de estapedotomias

    Directory of Open Access Journals (Sweden)

    Testa José Ricardo Gurgel

    2002-01-01

    Full Text Available Introdução: Otospongiose ou otosclerose é uma moléstia heredo-degenerativa da cápsula labiríntica relativamente comum e que ocorre principalmente em mulheres entre 20 e 30 anos de idade. Nas últimas décadas a estapedotomia tem sido uma técnica preferida por muitos cirurgiões para o tratamento da otosclerose. Assim, esse trabalho analisa os resultados de 59 estapedotomias realizadas no Hospital Paulista de Otorrinolaringologia nos últimos 7 anos. Forma de estudo: Clínico randomizado. Materiais e Métodos: Estudo retrospectivo de 59 pacientes com otosclerose, submetidos a estapedotomia por um mesmo cirurgião, e com seguimento clínico e audiométrico. Resultados: Melhora auditiva comprovada pelo fechamento do gap na audiometria em 53 pacientes (90%. Complicações ocorridas são relacionadas por ordem decrescente de freqüência: deslocamento da prótese (7%, alterações no paladar (7%, paralisia facial (3%, vertigem (3%, extrusão total da prótese (1,5%, tinnitus persistente (1,5%, perfuração da membrana timpânica (1,5%. Conclusão: A estapedotomia vem se mostrando uma boa opção terapêutica, já que, em geral, apresenta baixa morbidade e altas taxas de sucesso, proporcionando melhor qualidade de vida para os portadores de otosclerose.

  7. Promoviendo la inclusión social en los primeros años

    Directory of Open Access Journals (Sweden)

    José Amar Amar

    2007-01-01

    Full Text Available En América Latina y el Caribe millones de niños viven una situación de pobreza que los excluye de toda posibilidad de una vida digna. Este artículo presenta resultados de investigaciones sobre programas dirigidos a la infancia que vive en contextos de pobreza. Objetivo: Conocer el impacto del Programa Hogares Comunitarios de Bienestar en el desarrollo de los niños que han participado en estos programas. Materiales y métodos: Se trabajó con un diseño de comparación entre tres grupos, un grupo experimental (niños que asistieron al Programa Hogares de bienestar y dos grupos control (niños que asistieron a programas convencionales del Estado y niños que no asistieron a ningún tipo de programa. Se utilizó la tabla de parámetros para talla y peso del ICBF, la Escala Abreviada de Desarrollo y el registro de calificaciones. Resultados: Los niños que participan en el Programa Hogares Comunitarios presentan un desarrollo superior a nivel cognitivo y personal social. Conclusiones: La Universidad del Norte a través del Programa Hogares Comunitarios de Bienestar muestra que la inclusión social a partir de los primeros años, implica darles la responsabilidad de la atención del niño a sus familias y comunidades locales.

  8. PRIMEROS ANTECEDENTES SOBRE LO INFINITAMENTE PEQUEÑO

    Directory of Open Access Journals (Sweden)

    Iván Castro Chadid

    2004-06-01

    Full Text Available El concepto matemático de lo infinitamente pequeño fue fruto de un arduo trabajo de la humanidad a través de muchos siglos, los primeros logros al respecto se deben fundamentalmente a los desarrollos obtenidos por los atomistas cuyos principales exponentes fueron Demócrito, Zenón, Arquímedes en la antigua Grecia y Galileo, Cavalieri en el Renacimiento. En este artículo se hace una presentación de los métodos empleados por Arquímedes y Cavalieri para abordar este problema desde su propia perspectiva.

  9. Mis primeros Clásicos Poéticos

    OpenAIRE

    Gómez Yebra, Antonio Agustín

    2015-01-01

    A partir de indagar sobre la memoria y los recuerdos, el profesor y escritor Antonio A. Gómez Yebra ofrece un recorrido de situaciones, emociones, anécdotas y experiencias con la lectura y la literatura desde sus primeros años escolares, volviendo la mirada hacia la escuela de antaño de la mano de evocaciones literarias de poemas, cuentos, novelas, ensayos, etc., de los principales autores y autoras que configuraron su poética, destacando también, a modo de homenaje, a las maestras, profes...

  10. Los primeros Cálculos Probabilísticos

    Directory of Open Access Journals (Sweden)

    Marta García Secades

    2002-01-01

    Full Text Available En esta comunicación analizaremos las contribuciones de los primeros autores que dedicaron sus esfuerzos a resolver problemas relativos a los juegos de azar. Distinguiremos los estudios realizados en este sentido en tres etapas: La primera abarcará a aquellos autores que están situados en el tiempo antes de Pascal y Fermat: Pacioli, Cardano y Galileo, La segunda, que abarcará los trabajos de Pascal y Fermat, para concluir con un tercera etapa, donde se estudiará la probabilidad matemática de Huygens y Caramuel.

  11. GPS Satellite Simulation Facility

    Data.gov (United States)

    Federal Laboratory Consortium — The GPS satellite simulation facility consists of a GPS satellite simulator controlled by either a Silicon Graphics Origin 2000 or PC depending upon unit under test...

  12. GPS, punto de contacto entre la Astronomía y otras disciplinas

    Science.gov (United States)

    Perdomo, R.

    En los primeros años de la pasada década, un grupo de Astrónomos de La Plata iniciaron trabajos de investigación en Geodesia Satelital. En esta presentación se propone repasar sus principales logros y situarlos en el contexto del desarrollo de la disciplina a nivel mundial. Por entonces las aplicaciones prácticas de la disciplina eran indirectas y solo evidentes para los especialistas. Los errores del Posicionamiento Satelital eran de varios metros y en posicionamiento relativo, del orden de medio metro. Estos resultados se lograban al cabo de varios días de medición continuada. En los años siguientes, el sistema GPS alcanzó su nivel operacional y produjo una revolución tanto en lo relacionado con los tiempos de medición como con las precisiones. El grupo de La Plata se desarrolló simultáneamente con GPS, lo que posibilitó su participación actual en diversos temas vigentes: aplicaciones de alta precisión para la materialización de sistemas terrestres de referencia, monitoreo de movimientos de la corteza, contribución con servicios internacionales para la determinación de movimientos tectónicos globales y regionales, monitoreo de la ionósfera a partir de la propagación de las señales, determinación de la ondulación del geoide a escala local, etc. También se generaron muchas aplicaciones prácticas algunas en tiempo real: navegación, apoyo a imágenes aéreas o satelitales, aplicaciones a la agricultura, catastro y ordenamiento territorial, apoyo a relevamientos geofísicos, etc.

  13. GPS Test Facility

    Data.gov (United States)

    Federal Laboratory Consortium — The Global Positioning System (GPS) Test Facility Instrumentation Suite (GPSIS) provides great flexibility in testing receivers by providing operational control of...

  14. Resultados de aprendizaje en América Latina a partir de las evaluaciones nacionales

    OpenAIRE

    Murillo Torrecilla, Francisco Javier; Román, Marcela

    2008-01-01

    El artículo analiza y compara los resultados del desempeño escolar de estudiantes de los últimos cursos de Educación Primaria y primeros grados de Educación Secundaria de 15 países América Latina. Lo hace desde la información y datos obtenidos de los reportes que han elaborado las propias unidades de evaluación de los Ministerios de Educación de los respectivos países para trabajar y difundir los resultados. El estudio analiza, en primer lugar, la situación actual del rendimiento escolar a pa...

  15. La radio: aquellos primeros años

    Directory of Open Access Journals (Sweden)

    Luis Dávila Loor

    2015-01-01

    Full Text Available El autor reseña lo que fueron los primeros años de la radio, pues luego de inventado el telégrafo, el gramófono y el teléfono, estaban dados los ingredientes para inventar la radio. Las dos primeras décadas la radio fue utilizada para fines militares y marítimos. En los años 20 llegó a su máximo apogeo. Advino más tarde(1924 el radio teatro. La disonancia no lo desanimaba, Edison seguramente estaba convencido que un siglo después aparecerían los compac disks, en los que se escucharían con absoluta fidelidad las bulliciosas pero armoniosas canciones de un cantante negro con facha de mujer blanca. Con el desarrollo de la televisión vino el declive de la radio tradicional pero se inicio la etapa de la radio compañera que más tarde dio a lugar a la radio comunitaria.

  16. Innovaciones tecnológicas aplicads al transporte colectivo en Quito: optimización en la evaluación de la demanda con GPS y SIG

    Directory of Open Access Journals (Sweden)

    2004-01-01

    Full Text Available Cet article présente un triple intérêt. En premier lieu, il décrit FINDEM, un système embarqué intégrant un GPS permettant le comptage semi-automatique des usagers du transport en commun élaboré à Quito. En second lieu, il présente la méthodologie de traitement des données effectuée avec le Système d’Information Géographique SAVANE. Enfin, sont détaillés les principaux résultats obtenus suite à une première enquête “ Montées-Descentes ” réalisée avec FINDEM dans les bus, le long d’un axe périurbain Quito - El Quinche. El presente artículo tiene un triple objetivo. Primero, describir FINDEM, un sistema instalado en las unidades del transporte colectivo provisto con un GPS que permite el conteo semiautomático de pasajeros. Segundo, presentar la metodología de procesamiento de los datos recopilados mediante el uso del Sistema de Información Geográfico SAVANE. Tercero, detallar los principales resultados obtenidos en una primera encuesta Ascensos Descensos realizada con FINDEM en los buses del corredor interparroquial Quito - El Quinche. This paper serves three purposes. First, to detail FINDEM, an on-board system developed in Quito, which integrates a GPS and allows a semi-automatic passengers’ counting within an urban transportation network. Second, to present the methodology about the processing of the data collected with this equipment using a Geographical Information System called SAVANE. Third, to give the main results of a first “Getting On-Off” survey carried out with FINDEM on buses, along the “Quito - El Quinche” suburban corridor.

  17. GPS system simulation methodology

    Science.gov (United States)

    Ewing, Thomas F.

    1993-01-01

    The following topics are presented: background; Global Positioning System (GPS) methodology overview; the graphical user interface (GUI); current models; application to space nuclear power/propulsion; and interfacing requirements. The discussion is presented in vugraph form.

  18. The Statistics of GPS

    National Research Council Canada - National Science Library

    Matsakis, Demetrios

    2007-01-01

    The Global Positioning System (GPS) is an extremely effective satellite-based system that broadcasts sufficient information for a user to determine time and position from any location on or near the Earth...

  19. GPS satellite surveying

    CERN Document Server

    Leick, Alfred; Tatarnikov, Dmitry

    2015-01-01

    THE MOST COMPREHENSIVE, UP-TO-DATE GUIDE ON GPS TECHNOLOGY FOR SURVEYING Three previous editions have established GPS Satellite Surveying as the definitive industry reference. Now fully updated and expanded to reflect the newest developments in the field, this Fourth Edition features cutting-edge information on GNSS antennas, precise point positioning, real-time relative positioning, lattice reduction, and much more. Expert authors examine additional tools and applications, offering complete coverage of geodetic surveying using satellite technologies. The past decade has seen a major evolut

  20. Los cabildos catedralicios de Santiago y Orense en el reinado de Felipe V: algunos resultados

    Directory of Open Access Journals (Sweden)

    María SEIJAS MONTERO

    2017-06-01

    Full Text Available Este artículo presenta los primeros resultados del estudio realizado sobre los cabildos catedralicios de Santiago y Orense durante el reinado de Felipe V. El objetivo fundamental se centra en dar a conocer la estructuración del personal de las catedrales, es decir, el número y ocupaciones de los capitulares, su procedencia geográfica para el caso compostelano, las relaciones de parentesco y la interrelación de sus miembros con los gobiernos locales de Santiago y Orense.

  1. Primeros pasos del Benchmarking en Boyacá

    Directory of Open Access Journals (Sweden)

    Germán Darío Arévalo Vega Óscar Javier Gutiérrez Junco

    2010-11-01

    Full Text Available El Benchmarking es un proceso continuo en búsquedade la excelencia, que ha venido ganando auge en lasempresas  constructoras  latinoamericanas a  raíz deléxito  rotundo  que  tuvo  en  compañías  similares  dediferentes partes del mundo. El proceso fue adoptadoy  desarrollado  en  Colombia  por  el  Grupo  deInvestigación  en Construcción  de  la UniversidadEAFIT  –GESCON–  con  excelentes  resultados.Aunque su estructuración fue concebida en Colombiaen  el  año 2002,  en nuestra  región  es muy poca  suejecución y  tras experiencias de  su  implementaciónen  proyectos  boyacenses  se  logran  conocer  susgrandes  beneficios,  aunque  también  una  serie  defalencias  en  la  concepción  de  sus  indicadores  yposibles  limitaciones  ante  proyectos  de  pocaenvergadura  económica.

  2. GPS Ephemeris Message Broadcast Simulation

    National Research Council Canada - National Science Library

    Browne, Nathan J; Light, James J

    2005-01-01

    The warfighter constantly needs increased accuracy from GPS and a means to increasing this accuracy to the decimeter level is a broadcast ephemeris message containing GPS satellite orbit and clock corrections...

  3. Variability in GPS sources

    NARCIS (Netherlands)

    Jauncey, DL; King, EA; Bignall, HE; Lovell, JEJ; Kedziora-Chudczer, L; Tzioumis, AK; Tingay, SJ; Macquart, JP; McCulloch, PM

    2003-01-01

    Flux density monitoring data at 2.3 and 8.4 GHz is presented for a sample of 33 southern hemisphere GPS sources, drawn from the 2.7 GHz Parkes survey. This monitoring data, together with VLBI monitoring data, shows that a small fraction of these sources, similar to10%, vary. Their variability falls

  4. Semantic Enrichment of GPS Trajectories

    NARCIS (Netherlands)

    de Graaff, V.; van Keulen, Maurice; de By, R.A.

    2012-01-01

    Semantic annotation of GPS trajectories helps us to recognize the interests of the creator of the GPS trajectories. Automating this trajectory annotation circumvents the requirement of additional user input. To annotate the GPS traces automatically, two types of automated input are required: 1) a

  5. Efficient GPS Position Determination Algorithms

    National Research Council Canada - National Science Library

    Nguyen, Thao Q

    2007-01-01

    ... differential GPS algorithm for a network of users. The stand-alone user GPS algorithm is a direct, closed-form, and efficient new position determination algorithm that exploits the closed-form solution of the GPS trilateration equations and works...

  6. Fundamentos Conceptuales del Resultado Global

    Directory of Open Access Journals (Sweden)

    Francisco Sousa Fernández

    2009-12-01

    Full Text Available Con el propósito de reportar una mayor utilidad a los inversores, desde la década de los noventa del siglo XX los organismos emisores de normas contables más influyentes en el panorama internacional, entre los que cabe destacar el IASB y el FASB, han incorporado a sus cuerpos normativos el resultado global, asumido también en la Circular 4/2004 del Banco de España y en el Plan General de Contabilidad 2007.Ante esta concepción novedosa del resultado empresarial para nuestro entorno, este trabajo plantea como objetivo esencial revisar, acotar y sintetizar sus fundamentos teóricos, dispersos a lo largo del siglo XX, fundamentalmente en la literatura contable anglosajona.Una vez delimitado su soporte conceptual, además de destacar la existencia de un gap significativo entre el mismo y la realidad de su regulación actual, queremos analizar la incidencia de su adopción en la práctica, para lo que revisamos las contribuciones empíricas de los últimos años.For the convenience of investors, since the 1990s the most influential accounting standard-setters on the international scene, including the IASB and the FASB, have incorporated the concept of comprehensive income, also adopted in Circular 4/2004 of the Bank of Spain and in the 2007 General Accounting Plan.In view of this new conception of corporate income for our environment, this study aims to review, delimit and synthesize its theoretical foundations, found throughout the 20th Century, predominantly in the Anglo-Saxon accounting literature.Once its conceptual foundations are delimited, besides emphasizing the existence of a significant gap between such conceptual foundations and the reality of present regulations, we will analyze the effect of the adoption of this new conception in practice. To do so, the empirical contributions over the last few years will be taken into consideration.

  7. Indoor Positioning Using GPS Revisited

    DEFF Research Database (Denmark)

    Kjærgaard, Mikkel Baun; Blunck, Henrik; Godsk, Torben

    2010-01-01

    It has been considered a fact that GPS performs too poorly inside buildings to provide usable indoor positioning. We analyze results of a measurement campaign to improve on the understanding of indoor GPS reception characteristics. The results show that using state-of-the-art receivers GPS...... low signal-to-noise ratios, multipath phenomena or bad satellite constellation geometry. We have also measured the indoor performance of embedded GPS receivers in mobile phones which provided lower availability and accuracy than state-of-the-art ones. Finally, we consider how the GPS performance...

  8. GPS antenna designs

    Science.gov (United States)

    Laube, Samuel J. P.

    1987-05-01

    Application of the current GPS NAVSTAR system to civilian service requires that a right hand, circularly polarized, -160 dBW spread spectrum signal be received from an orbiting satellite, where the antenna environment is also moving. This presents a design challenge when inexpensive antennas are desired. The intent of this survey is to provide information on the antennas mentioned and to construct and test prototypes to determine whether the choice made by the industry, the quadrifilar helix, is the best. The helix antenna is currently the low cost standard for GPS. Prototype versions were constructed using 12 gauge wire and subminiature coaxial hardline. The constructed antennas were tested using a signal generator and a reference turnstile. A spectrum analyzer was used to measure the level of the received signal.

  9. GPS & Galileo. Friendly Foes?

    Science.gov (United States)

    2007-04-01

    some of their data, others employ different techniques. United States defense contractor Lockheed Martin developed an anti-jam GPS receiver in 2000 for...Europe in a New Generation of Satellite Navigation Services,” European Commission (9 Feb 1999): 16. 25. Ibid. 26. Anne Jolis , “Problems Run Rampant...European Outer Space,” Euro Topics (19 March 2007), found at http://www.eurotopics.net/en/presseschau/archiv/archiv_dossier/DOSSIER15435. 40. Jolis

  10. Aproximación histórica y metalúrgica a los primeros hornos altos

    Directory of Open Access Journals (Sweden)

    Setién, J.

    2008-08-01

    Full Text Available This work presents a brief historical review of the origin and development of the first Spanish blast furnaces, as an essential part of The Royal Artillery Works at Liérganes and La Cavada. After a concise description of the siderurgical processes involved, the results of the metallurgical analysis performed on slags from these furnaces are shown. Also the metallographic study of a cannonball is included. These results reveal that, in spite of the well-known quality of the cast products, the mineral reduction in furnaces was not complete and the associated processes were not totally under the foundryman’s control.

    En este trabajo se presenta una somera revisión histórica del origen y funcionamiento de los primeros hornos altos que operaron en España, como parte esencial de las Reales Fábricas de Artillería de Liérganes y La Cavada. Tras describir brevemente los procesos siderúrgicos involucrados, se muestran los resultados de los análisis metalúrgicos efectuados sobre muestras de escorias procedentes de estos hornos, así como el estudio metalográfico de una bala de cañón de idéntica procedencia. Estos resultados muestran que, a pesar de la reconocida calidad de las piezas de artillería obtenidas, los procesos de reducción de mineral aplicados en el horno eran imperfectos y no estaban totalmente bajo el control del fundidor.

  11. Detección molecular del virus papiloma humano de alto riesgo oncogénico en muestras cervicales. Laboratorio Central de Salud Pública. Primeros Resultados

    Directory of Open Access Journals (Sweden)

    Maria Liz Bobadilla

    2015-04-01

    Full Text Available El cáncer de cuello uterino es la primera causa de muerte por cáncer en mujeres en países en vías de desarrollo, con una tasa de incidencia de 34,2 por 100.000 mujeres y de mortalidad de 15,7 por 100.000 mujeres en Paraguay. La sensibilidad de la citología está entre 30-60%, mientras que la de la detección molecular del Virus Papiloma Humano (VPH en muestras cervicales, es mayor al 90% para detectar neoplasia intraepitelial cervical de grado 2 (CIN II o más. El objetivo de este trabajo fue describir la frecuencia de detección de VPH de alto riesgo (AR y su distribución por edad en mujeres que concurrieron al Hospital San Pablo, de mayo a agosto de 2.013. Se estudiaron 170 muestras cervicales de pacientes que accedieron a participar firmando un consentimiento informado. Se utilizó el sistema Cobas 4800 HPV Test (Roche que detecta los VPH-AR 16 y 18, y un pool de 10 VPH-AR (31,33,35,39,45,51,52,56,58,59 y dos de “probable” alto riesgo (66,68. La frecuencia de infección por VPH-AR fue del 16%, la infección decrecía con la edad y el mayor número de casos apareció en mujeres menores de 30 años. El VPH-16 fue encontrado en todos los grupos de edades. Este es el primer reporte de la detección de ADN de VPH-AR en el LCSP, y se muestra que la prevención y control del cáncer cérvico-uterino es una prioridad de salud pública en el país por la gran carga de la enfermedad evidenciada por su alta incidencia y mortalidad.

  12. La presencia de la biotecnolog??a dentro y fuera de la escuela. Primeros resultados de un estudio diagn??stico

    OpenAIRE

    Enrique Mir??n, Carmen; Cabo Hern??ndez, Jos?? Manuel; Corti??as Jurado, Jos?? R.

    2007-01-01

    En este art??culo se analizan diversas fuentes de informaci??n (estudios sociol??gicos y de opini??n sobre Biotecnolog??a, prensa escrita, revistas especializadas de divulgaci??n cient??fica y tecnol??gica), opiniones del profesorado no universitario sobre cuestiones generales y espec??ficas de Biotecnolog??a y la propia historia de la Biotecnolog??a. Las conclusiones apuntan a la influencia de los medios de comunicaci??n en la opini??n del profesorado, al igual que en el caso del p??blico en...

  13. Pescadores-recolectores arcaicos del extremo sur peruano. Excavaciones en La Quebrada de los burros (Tacna, Perú. Primeros resultados 1995-1997

    Directory of Open Access Journals (Sweden)

    1999-01-01

    Full Text Available PÊCHEURS-COLLECTEURS ARCHAÏQUES DE L’EXTRÊME SUD PÉRUVIEN. LES FOUILLES DE LA QUEBRADA DE LOS BURROS (TACNA, PEROU. PREMIERS RESULTATS, 1995-1997. Au début de l´Archaïque, des groupes humains vivant des ressources marines et, en moindre mesure, de chasse terrestre, s’installent régulièrement sur la côte sud du Pérou. Dans la Quebrada de los Burros, les datations 14C situent ces occupations entre 9800 et 3200 BP, durant une période climatique calme et relativement humide la formation, dans la vallée, entre 120 et 200 m d’altitude, de lagunes d’eau douce ou de marécages constitue alors un facteur très favorable à une implantation humaine (voir Usselmann et al., ce volume. Les niveaux d’occupation exploités sur de larges surfaces ont livré des foyers, un abondant matériel lithique taillé, des accumulations de coquilles (Concholepas concholepas, Mesodesma donacium, Fissurella sp., Choromytilus chorus etc. et de nombreux restes de poissons très diversifiés, impliquant diverses techniques halieutiques. Sont également attestés quelques restes de mammifères terrestres et d’oiseaux. Diverses analyses en cours sur les coquilles détermineront s’il s’agissait d’installations saisonnières ou permanentes. Al inicio del Arcaico, grupos humanos que viven de los recursos del medio marítimo y, en escala menor, de la caza terrestre (camélidos, aves, están instalados en la costa sur del Perú. En la Quebrada de los Burros, fechados 14C sitúan estas ocupaciones entre 9800 y 3200 BP, durante un período climático tranquilo y relativamente húmedo en el fondo del valle, entre 120 y 200 msnm, la formación de lagunas de agua dulce o de pantanos constituye entonces un elemento muy favorable para una implantación humana (véase Usselmann et al., este volumen. Los niveles de ocupación excavados en un área extensa contenían fogones, un abundante material lítico tallado, acumulaciones de conchas marinas (Concholepas concholepas, Mesodesma donacium, Fissurella sp., Choromytilus chorus, etc. y numerosos restos óseos de peces muy diversificados, lo que implica técnicas de pesca diversas y sofisticadas. Los análisis (isotópicos y de crecimiento en curso sobre conchas marinas deberían contribuir a determinar si se trataba de instalaciones permanentes o estacionales. ARCHAIC FISHERMEN AND SHELL-GATHERERS OF EXTREME-SOUTH OF PERU. EXCAVATIONS IN QUEBRADA DE LOS BURROS (TACNA, PERU. PRELIMINARY RESULTS 1995-1997. At the outset of the Archaïc Period, human groups subsisting on marine resources and occasional terestrial hunting, began to settle down on the South Peruvian coast. In Quebrada de los Burros, 14C dates place these regular occupations between 9800 to 3200 BP, during a phase of a calm and relatively wet climate (see Usselmann et al., this volume. The consequent formation in the valley of fresh water or stagnant ponds created highly favorable circumstances for human settlements. Broad horizontal excavations have discovered occupation levels with several hearths, abundant lithic equipment, shell concentrations (Concholepas concholepas, Mesodesma donacium, Fissurella sp., Choromytilus chorus.... and fish remains belonging to many species, suggesting diverse and sophisticated halieutic techniques. Some remains of birds and terrestrial mammals have also been encountered. Analysis on shells, presently in progress, will try to determine whether those archaic settlements were seasonal or permanent throughout the year.

  14. Documento de síntesis: investigación, inmigración, vivienda y ciudad. Primeros resultados la Maurina [Terrassa] y el Raval [Barcelona

    OpenAIRE

    Gutiérrez Valdivia, Blanca Alexandra

    2010-01-01

    El objetivo global de esta investigación es conocer en detalle las características de las viviendas de la población inmigrada y el uso que esta población hace de los espacios públicos de sus entornos cotidianos.

  15. Perspectivas de análisis y primeros resultados de una investigación sobre la relación entre formación y empleo

    Directory of Open Access Journals (Sweden)

    FAUSTINO MIGUÉLEZ

    1997-01-01

    Full Text Available este articulo sobre la relacion entre formacion e insercion laboral se refiere a una investigacion en curso y, en consecuencia, las conclusiones presentadas son parciales y por tanto provisionales. por ello se insiste sobre todo en los planteamientos generales, en los objetivos, en la aproximacion metodologica. la orientacion mantenida, y esta es su originalidad e interes, consiste en proponer y analizar el fenomeno de la relacion entre formacion e insercion laboral dentro de una perspectiva mas amplia que la de las teorias habituales, tanto desde el punto de vista del contexto social como del conjunto de dimensiones con que se define la formacion. asi, y con relacion a la insercion laboral dentro de una crisis estructural y mantenida del empleo, pueden ser importantes los aspectos curriculares y de la experiencia laboral, pero tambien otros ligados a la socializacion, a las redes sociales, a los diversos acontecimientos de la biografia, a la propia estrategia del trabajador y a otros mas vinculados a comportamientos y actitudes.

  16. Primeros resultados del estudio de un nuevo yacimiento de icnofauna triásica en Peña Sagra (Cantabria. España

    Directory of Open Access Journals (Sweden)

    Saiz de Omeñaca, J.

    1990-04-01

    Full Text Available The discovery of new outcrops with footprints of small vertebrates has been made, in the Sierra de Peña Sagra (Cantabria, Spain. A foot-hand pair, unique, of the Rhynchosauroides genus and two trails and a large number of footprints coming from a very small reptile have been found. The last has been interpreted as belonging to the Procolophonichnium NOPCSA genus, although its small size forces us to admit it ought to be applied to very young specimens.El descubrimiento de un nuevo yacimiento de icnofauna triásica, en la sierra de Peña Sagra (Cantabria, ha proporcionado un par pie-mano, único, de Rhynchosauroides sp, y dos pistas y numerosas pisadas aisladas correspondientes a un reptil de talla muy pequeña. Se interpreta que éste pertenece al icnogénero Procolophonichnium NOPCSA, si bien sus reducidas dimensiones fuerzan a admitir que podría tratarse de ejemplares juveniles.

  17. Standardization of GPS data processing

    International Nuclear Information System (INIS)

    Park, Pil Ho

    2001-06-01

    A nationwide GPS network has been constructed with about 60 permanent GPS stations after late 1990s in Korea. For using the GPS in variety of application area like crustal deformation, positioning, or monitoring upper atmosphere, it is necessary to have ability to process the data precisely. Now Korea Astronomy Observatory has the precise GPS data processing technique in Korea because it is difficult to understand characteristics of the parameters we want to estimate, resolve the integer ambiguity, and analyze many errors. There are three reliable GPS data processing software in the world ; Bernese(University of Berne), GIPSY-OASIS(JPL), GAMIT(MIT). These software allow us to achieve millimeter accuracy in the horizontal position and about 1 cm accuracy vertically even for regional networks with a diameter of several thousand kilometers. But we established the standard of GPS data processing using Bernese as main tool and GIPSY O ASIS as side

  18. Sensing Human Activity: GPS Tracking

    Science.gov (United States)

    van der Spek, Stefan; van Schaick, Jeroen; de Bois, Peter; de Haan, Remco

    2009-01-01

    The enhancement of GPS technology enables the use of GPS devices not only as navigation and orientation tools, but also as instruments used to capture travelled routes: as sensors that measure activity on a city scale or the regional scale. TU Delft developed a process and database architecture for collecting data on pedestrian movement in three European city centres, Norwich, Rouen and Koblenz, and in another experiment for collecting activity data of 13 families in Almere (The Netherlands) for one week. The question posed in this paper is: what is the value of GPS as ‘sensor technology’ measuring activities of people? The conclusion is that GPS offers a widely useable instrument to collect invaluable spatial-temporal data on different scales and in different settings adding new layers of knowledge to urban studies, but the use of GPS-technology and deployment of GPS-devices still offers significant challenges for future research. PMID:22574061

  19. Sensing Human Activity: GPS Tracking

    Directory of Open Access Journals (Sweden)

    Remco de Haan

    2009-04-01

    Full Text Available The enhancement of GPS technology enables the use of GPS devices not only as navigation and orientation tools, but also as instruments used to capture travelled routes: as sensors that measure activity on a city scale or the regional scale. TU Delft developed a process and database architecture for collecting data on pedestrian movement in three European city centres, Norwich, Rouen and Koblenz, and in another experiment for collecting activity data of 13 families in Almere (The Netherlands for one week. The question posed in this paper is: what is the value of GPS as ‘sensor technology’ measuring activities of people? The conclusion is that GPS offers a widely useable instrument to collect invaluable spatial-temporal data on different scales and in different settings adding new layers of knowledge to urban studies, but the use of GPS-technology and deployment of GPS-devices still offers significant challenges for future research.

  20. GPS: Public Utility or Software Platform

    Science.gov (United States)

    2016-09-01

    train for GPS loss, encourage use of GPS signal integrity monitors , develop in- vehicle GPS backups, and evaluate the range of radio...literature prevent the full quantification of exactly how vulnerable GPS is to service interruption. This thesis used constant comparison analysis to...criticality, resilience, and vulnerability. This methodology overcomes research limitations by using GPS system design, operations, and policies as

  1. The GPS odograph user's guide

    Science.gov (United States)

    The GPS-based Odograph Prototype (GOP or GPS Odograph) was developed in an effort sponsored by The Federal Highway Administration (FHWA). The purpose of this effort was to develop a means of using inexpensive commercial off-the-self laptop (or notebo...

  2. High Gain Advanced GPS Receiver

    National Research Council Canada - National Science Library

    Brown, Alison; Zhang, Gengsheng

    2006-01-01

    NAVSYS High Gain Advanced GPS Receiver (HAGR) uses a digital beam-steering antenna array to enable up to eight GPS satellites to be tracked, each with up to 10 dBi of additional antenna gain over a conventional receiver solution...

  3. Sensing human activity : GPS tracking

    NARCIS (Netherlands)

    van der Spek, Stefan; van Schaick, Jeroen; de Bois, P.G.; de Haan, Remco

    2009-01-01

    The enhancement of GPS technology enables the use of GPS devices not only as navigation and orientation tools, but also as instruments used to capture travelled routes: as sensors that measure activity on a city scale or the regional scale. TU Delft developed a process and database architecture for

  4. Voluntad de conocimiento y escepticismo en Primero sueño.

    OpenAIRE

    Montesa Bernet, Raquel

    2006-01-01

    Este trabajo analiza el poema Primero Sueño, de Sor Juana Inés de la Cruz, e intenta dar respuesta a las siguientes cuestiones: ¿Por qué describe el poema “un sueño” como vía de conocimiento? ¿Qué es lo que pretende conocer el alma en Primero Sueño? ¿Cómo se lleva a cabo la aventura cognoscitiva en el poema? ¿Cuál es la actitud de Sor Juana frente a la imposibilidad de aprehensión total del universo? ¿Se trata de un poema escéptico?

  5. GPS Position Time Series @ JPL

    Science.gov (United States)

    Owen, Susan; Moore, Angelyn; Kedar, Sharon; Liu, Zhen; Webb, Frank; Heflin, Mike; Desai, Shailen

    2013-01-01

    Different flavors of GPS time series analysis at JPL - Use same GPS Precise Point Positioning Analysis raw time series - Variations in time series analysis/post-processing driven by different users. center dot JPL Global Time Series/Velocities - researchers studying reference frame, combining with VLBI/SLR/DORIS center dot JPL/SOPAC Combined Time Series/Velocities - crustal deformation for tectonic, volcanic, ground water studies center dot ARIA Time Series/Coseismic Data Products - Hazard monitoring and response focused center dot ARIA data system designed to integrate GPS and InSAR - GPS tropospheric delay used for correcting InSAR - Caltech's GIANT time series analysis uses GPS to correct orbital errors in InSAR - Zhen Liu's talking tomorrow on InSAR Time Series analysis

  6. Evidential recovery from GPS devices

    Directory of Open Access Journals (Sweden)

    Brian Cusack

    Full Text Available Global Positioning Systems (GPS have become more affordable, are now widely used in motor vehicles and in other frequently used applications. As a consequence GPS are increasingly becoming an important source of evidential data for digital forensic investigations. This paper acknowledges there are only disparate documents for the guidance of an investigator when extracting evidence form such systems. The focus of this paper is to provide the technical details of recovering artifacts from four GPS currently available to the New Zealand market. Navman brand GPS are used, following a forensically robust process. The steps of the process are described, results analysed and the associated risks are discussed. In addition, the paper discusses techniques related to the visual presentation of evidence suitable for Google Maps. Automation attempts to speed up the analysis to visualization steps are also included. The outcome is a road map that may assist digital forensic investigators develop GPS examination strategies for implementation in their own organizations.

  7. Pensamiento constructivo y variables sociodemográficas en estudiantes de primero a tercer semestre de la facultad de psicología de la Universidad Autónoma de Bucaramanga

    Directory of Open Access Journals (Sweden)

    Leonardo Yovany Álvarez Ramírez

    2007-01-01

    Full Text Available El objetivo de este estudio fue establecer la modalidad de pensamiento constructivo de acuerdo con algunas variables sociodemográficas en estudiantes de primero a tercer semestre del programa de Psicología de la UNAB. La muestra estuvo compuesta por 70 estudiantes. A dicha muestra se le aplicó el inventario de pensamiento constructivo y algunas preguntas sociodemográficas. Los resultados indican que los estudiantes varones presentan una mejor puntuación en pensamiento constructivo que las mujeres. Además, los estudiantes mayores presentan mayor puntuación en pensamiento constructivo que los jóvenes.

  8. Atención, sociólogos trabajando. Desafíos de la inserción profesional de los primeros sociólogos y sociólogas en Argentina (1961-1985

    Directory of Open Access Journals (Sweden)

    Diego Pereyra

    2015-12-01

    Full Text Available DOI: http://dx.doi.org/10.5007/2175-7984.2015v14n31p227 Este artículo discute y presenta los primeros resultados de una investigación sobre el proceso de profesionalización de la sociología argentina entre principios de la década de 1960 y mediados de la década de 1980. El trabajo propone un estudio integral sobre la situación laboral de los egresados en sociología en cinco universidades seleccionadas (UBA, UCA, USAL, UNMP, UB, buscando responder al interrogante de qué trabajaron los primeros sociólogos y sociólogas en Argentina y cuáles fueron sus estrategias de inserción profesional. En este caso, se despliega un análisis de los datos producidos mediante una encuesta a sociólogos(as egresados de las universidades seleccionadas y varias entrevistas en profundidad. El texto comenta críticamente los déficits de información sobre el campo, reflexiona sobre las dificultades metodológicas de tal emprendimiento investigativo, exhibe un análisis de los primeros datos y presenta las primeras hipótesis de trabajo.

  9. Revisión de los tratamientos psicológicos en primeros episodios psicóticos

    Directory of Open Access Journals (Sweden)

    2012-09-01

    Conclusiones: Los estudios seleccionados confirman una mejora significativa en el curso y/o la sintomatología del trastorno a corto y a medio plazo, cuando se comparan con el tratamiento habitual. La detección y el tratamiento temprano de la psicosis reduce la tasa de transición en un seguimiento a dos años. También la sintomatología negativa y la funcionalidad parecen beneficiarse del tratamiento psicológico en estos pacientes. En los primeros episodios parece destacar el tratamiento integrado debido a que reporta beneficios importantes sobre la sintomatología negativa, los síntomas psicóticos, las tasas de recaídas, el tiempo de hospitalización y la funcionalidad global y social de los pacientes. Estos beneficios se pueden observar durante el seguimiento a dos años, no manteniéndose a los cinco años. Las diferencias encontradas entre ensayos pueden ser debidas a las diferentes técnicas utilizadas en el grupo control denominándose este tratamiento estándar o usual en el que no se ofrece detalles del mismo. Sin embargo, se requiere un mayor número de ensayos de calidad metodológica suficiente para incrementar la evidencia de cuáles son las técnicas más eficaces, o bien, poner en marcha una red de investigación donde se aúnen los esfuerzos investigadores de los grupos con proyectos relacionados para poder obtener muestras competitivas y resultados extrapolables.

  10. Rechazo y victimización al alumnado con necesidad de apoyo educativo en primero de primaria

    Directory of Open Access Journals (Sweden)

    Mª Inés Monjas

    2014-05-01

    Full Text Available Este estudio pretende analizar el rechazo y victimización social que experimenta el alumnado con necesidad de apoyo educativo en comparación con sus compañeros. Participaron 1351 alumnos de primero de educación primaria de los que 253 (el 18.7% fueron etiquetados por sus profesores como alumnos con necesidad de apoyo educativo ya que presentaban dificultades que hicieron necesaria ayuda educativa especial y adicional al resto de compañeros. La información ha sido proporcionada por los iguales (tipología sociométrica, reputación social y calificación sociométrica, el profesorado (competencia social y el propio alumno (victimización y competencia percibida. Los resultados indican que los alumnos con necesidad de apoyo educativo son más rechazados, tienen peor reputación social (más agresivos, más aislados y menos prosociales y sus profesores les califican como menos competentes socialmente. Informan de que son victimizados con más frecuencia que sus compañeros y se autoperciben como menos competentes cognitivamente y menos aceptados por sus iguales. Todo ello revela una evidente caracterización de este alumnado como rechazado y excluido. Es más, los aspectos que definen el perfil del rechazo se ven intensificados cuando se trata de estos alumnos, motivos por los que se concluye con la necesidad de prestar especial atención y cuidado a este colectivo en riesgo.

  11. Precise GPS orbits for geodesy

    Science.gov (United States)

    Colombo, Oscar L.

    1994-01-01

    The Global Positioning System (GPS) has become, in recent years, the main space-based system for surveying and navigation in many military, commercial, cadastral, mapping, and scientific applications. Better receivers, interferometric techniques (DGPS), and advances in post-processing methods have made possible to position fixed or moving receivers with sub-decimeter accuracies in a global reference frame. Improved methods for obtaining the orbits of the GPS satellites have played a major role in these achievements; this paper gives a personal view of the main developments in GPS orbit determination.

  12. Hastighedskort for Danmark vha. GPS

    DEFF Research Database (Denmark)

    Andersen, Ove; Lahrmann, Harry; Torp, Kristian

    2011-01-01

    Hastighed på vejnettet er en central metrik indenfor trafikplanlægning og trafikoptimering. I denne artikel beskrives, hvorledes et hastighedskort for hele Danmark er skabt udelukkende vha. GPS data. To tilgangsvinkler til at beregne hastigheder vha. GPS data er præsenteret. Dette er hhv. en....... Opsummeret anses den turbaseret for at beregne det mest akkurate estimat, men metoden er meget datakrævende. Det er derfor nødvendigt at have den punktbaserede at falde tilbage på. Generelt mangler metoder til beregning af hastigheder vha. GPS data at blive valideret. Hvordan en sådan validering kan...

  13. Relevancia valorativa del resultado global y sus Componentes frente al resultado neto

    Directory of Open Access Journals (Sweden)

    Núria Arimany Serrat

    2011-08-01

    Full Text Available Este trabajo tiene como objeto verificar si el resultado global presenta mayor relevancia valorativa respecto al resultado tradicional, y si es así cuáles son los componentes del resultado global que explican las diferencias. El estudio muestra que el resultado global es una variable relevante tanto para explicar el valor intrínseco de la empresa como para explicar su rentabilidad. Sin embargo, sólo al explicar la rentabilidad el resultado global y su incremento aumentan la relevancia valorativa del resultado neto y su incremento. De los componentes analizados del resultado global, tan sólo los resultados por diferencias de conversión de la moneda extranjera a la moneda de presentación añaden poder explicativo adicional al del resultado neto, aunque sólo en los modelos de rentabilidad. Ni los resultados por valoración de instrumentos financieros a valor razonable con cambios en patrimonio ni los resultados por coberturas de flujos de efectivo aportan un mayor poder explicativo al del resultado neto.

  14. 75 FR 8928 - Announcement of IS-GPS-200, IS-GPS-705, IS-GPS-800 Interface Control Working Group (ICWG...

    Science.gov (United States)

    2010-02-26

    ... DEPARTMENT OF DEFENSE Department of the Air Force Announcement of IS-GPS-200, IS-GPS-705, IS-GPS... document/s IS-GPS-200E (NAVSTAR GPS Space Segment/Navigation User Interfaces), IS-GPS-705A (NAVSTAR GPS Space Segment/User Segment L5 Interfaces), and IS-GPS-800A (NAVSTAR GPS Space Segment/User Segment L1C...

  15. LADOTD GPS technology management plan.

    Science.gov (United States)

    2012-02-01

    Over many years, Global Positioning System (GPS) technology has been adopted by different sections within the Louisiana : Department of Transportation and Development (DOTD), with no uniform standards for accuracy, operation, hardware, or : software....

  16. Scintillation-Hardened GPS Receiver

    Science.gov (United States)

    Stephens, Donald R.

    2015-01-01

    CommLargo, Inc., has developed a scintillation-hardened Global Positioning System (GPS) receiver that improves reliability for low-orbit missions and complies with NASA's Space Telecommunications Radio System (STRS) architecture standards. A software-defined radio (SDR) implementation allows a single hardware element to function as either a conventional radio or as a GPS receiver, providing backup and redundancy for platforms such as the International Space Station (ISS) and high-value remote sensing platforms. The innovation's flexible SDR implementation reduces cost, weight, and power requirements. Scintillation hardening improves mission reliability and variability. In Phase I, CommLargo refactored an open-source GPS software package with Kalman filter-based tracking loops to improve performance during scintillation and also demonstrated improved navigation during a geomagnetic storm. In Phase II, the company generated a new field-programmable gate array (FPGA)-based GPS waveform to demonstrate on NASA's Space Communication and Navigation (SCaN) test bed.

  17. GPS Navigation and Tracking Device

    Directory of Open Access Journals (Sweden)

    Yahya Salameh Khraisat

    2011-10-01

    Full Text Available Since the introduction of GPS Navigation systems in the marketplace, consumers and businesses have been coming up with innovative ways to use the technology in their everyday life. GPS Navigation and Tracking systems keep us from getting lost when we are in strange locations, they monitor children when they are away from home, keep track of business vehicles and can even let us know where a philandering partner is at all times. Because of this we attend to build a GPS tracking device to solve the mentioned problems. Our work consists of the GPS module that collects data from satellites and calculates the position information before transmitting them to the user’s PC (of Navigation system or observers (of Tracking System using wireless technology (GSM.

  18. Primeros registros de 4 especies de felinos en el sur de Puebla, México

    OpenAIRE

    Farías, Verónica; Téllez, Oswaldo; Botello, Francisco; Hernández, Omar; Berruecos, Jessica; Olivares, Saúl J.; Hernández, Julio C.

    2015-01-01

    Se presentan los primeros registros de margay (Leopardus wiedii), gato montés (Lynx rufus), puma (Puma concolor) y jaguarundi (Puma yagouaroundi) en el sur del estado de Puebla. El trabajo de campo fue parte de una monitorización participativa que incluyó a las autoridades civiles del ejido. Se colocaron 11 estaciones de cámaras-trampa digitales que funcionaron del 18 de diciembre de 2012 al 18 de febrero de 2014. Con un esfuerzo de muestreo de 2,669 días-trampa y dentro del conjunto de regis...

  19. Diseños didácticos con incorporaciones tecnológicas para el aprendizaje de las formas geométricas, en primeros grados de escolaridad de estudiantes sordos

    Directory of Open Access Journals (Sweden)

    Olga Lucía León

    2014-09-01

    Full Text Available Este artículo presenta resultados de investigaciones sobre diseños didácticos con incorporaciones tecnológicas para el aprendizaje de la geometría en estudiantes sordos, de los primeros grados de escolaridad. Los resultados profundizan en la relación trayectorias de aprendizaje y diseños didácticos para la enseñanza inicial de la geometría y presentan una experiencia focal con estudiantes sordos. Se destacan las mediaciones semióticas y tecnológicas en los procesos de significación de las formas geométricas. La metodología recupera los fundamentos de los “experimentos de enseñanza”, en particular la estructura denominada “el ciclo de enseñanza”.

  20. GPS measurements in Satakunta area

    International Nuclear Information System (INIS)

    Poutanen, M.; Nyberg, S.; Ahola, J.

    2010-10-01

    The Finnish Geodetic Institute, the Geological Survey of Finland, Posiva Ltd and municipalities in the district of Satakunta launched the GeoSatakunta research program in 2002 to carry out interdisciplinary studies on regional bedrock stress field and to apply the results e.g. in land use planning in the Satakunta area. The area was chosen for many reasons. Its geological diversity, extensive multi-disciplinary data coverage, and various interests of participants made the area suitable for the project. The purpose of the GPS observations is to get detailed information on recent crustal deformations in the area. The Finnish Geodetic Institute maintains e.g. national GPS network, FinnRef, and since 1995 a local research network in the Olkiluoto area. The Satakunta network differs from these, and this is the first time to obtain such detailed information of a regional network in Finland. The Satakunta GPS network consists of 13 concrete pillars for episodic GPS campaigns and the Olkiluoto permanent GPS station in the FinnRef network. The distances between the concrete pillars are 10-15 km, and the sites were chosen in a co-operation with the Geological Survey of Finland taking into account the geological structures in the area. The City of Pori made the final reconnaissance in the field and constructed eight pillars in 2003. The original network was expanded in 2005-2006 in Eurajoki and Rauma, and at the City of Rauma joined the co-operation. The five new pillars join the previous Olkiluoto network into the Satakunta network. There have been three annual GPS campaigns in 2003-2008. Time series of the Satakunta network are shorter than in the Olkiluoto network, and also the distances are longer. Therefore, the same accuracy than in Olkiluoto has not yet achieved. However, mm-sized movements can be excluded. Estimated velocities were small (0.2 mm/a) and mostly statistically insignificant because of relatively short time series. In this publication we describe the

  1. Determinantes de la Calidad del Resultado

    Directory of Open Access Journals (Sweden)

    Carmen Pineda González

    2000-06-01

    Full Text Available El concepto de calidad del resultado hace referencia a la posibilidad de que el resultado contable sea percibido por los usuarios de la información contable por encima o por debajo de su cuantificación numérica, o, de otro modo, a la posibilidad de percibir como diferentes los resultados de varias compañías aun cuando en términos cuantitativos sean de igual valor; de forma que será de mayor calidad aquél resultado que en mayor medida contribuya a limitar o a reducir el riesgo inherente al proceso de toma de decisiones. Este concepto general, sin embargo, ha tenido diferentes concreciones que requieren un estudio detallado. En consecuencia, el objetivo de este trabajo es revisar las diferentes definiciones de calidad del resultado que recoge la bibliografía contable y analizar los factores que la determinan, es decir; las decisiones empresariales, las normas contables, la manipulación, la estabilidad, el contenido monetario y los componentes permanentes del resultado. The concept of earnings quality refers to the possibility that accounting results are valued either above or below their numerical quantification, or; put another way, to the possibility of detecting differences in the results of various companies even though in quantitative terms they are of equal value, such that the results of the highest quality will be those which limit, or reduce, to the greatest extent the risk inherent in the decision making process. This general concept, however; has had different forms that require detailed study. In consequence, this paper aims both to review the different definitions of earnings quality present in the accounting literature, and to analyse the factors that determine earnings quality including: corporate decisions, accounting standards and the manipulation, stability, monetary content and permanent components of earnings.

  2. GPS/INS Sensor Fusion Using GPS Wind up Model

    Science.gov (United States)

    Williamson, Walton R. (Inventor)

    2013-01-01

    A method of stabilizing an inertial navigation system (INS), includes the steps of: receiving data from an inertial navigation system; and receiving a finite number of carrier phase observables using at least one GPS receiver from a plurality of GPS satellites; calculating a phase wind up correction; correcting at least one of the finite number of carrier phase observables using the phase wind up correction; and calculating a corrected IMU attitude or velocity or position using the corrected at least one of the finite number of carrier phase observables; and performing a step selected from the steps consisting of recording, reporting, or providing the corrected IMU attitude or velocity or position to another process that uses the corrected IMU attitude or velocity or position. A GPS stabilized inertial navigation system apparatus is also described.

  3. Relevancia valorativa del resultado global y sus componentes frente al resultado neto

    Directory of Open Access Journals (Sweden)

    Núria Arimany Serrat

    2011-12-01

    Full Text Available Este trabajo tiene como objeto verificar si el resultado global presenta mayor relevancia valorativa respecto al resultado tradicional, y si es así cuáles son los componentes del resultado global que explican las diferencias. El estudio muestra que el resultado global es una variable relevante tanto para explicar el valor intrínseco de la empresa como para explicar su rentabilidad. Sin embargo, sólo al explicar la rentabilidad el resultado global y su incremento aumentan la relevancia valorativa del resultado neto y su incremento. De los componentes analizados del resultado global, tan sólo los resultados por diferencias de conversión de la moneda extranjera a la moneda de presentación añaden poder explicativo adicional al del resultado neto, aunque sólo en los modelos de rentabilidad. Ni los resultados por valoración de instrumentos financieros a valor razonable con cambios en patrimonio ni los resultados por coberturas de flujos de efectivo aportan un mayor poder explicativo al del resultado neto.This study analyses if comprehensive income is more value relevant than the net income and, if that is the case, what are the elements of the comprehensive income explaining the difference. Our study shows that comprehensive income is a relevant variable both to explain the value of the company and also to explain its return. However, comprehensive income and its variation show to be more relevant than the net income and its variation only when explaining return. As for the components of the comprehensive income, foreign currency adjustments increase usefulness in the return models but cash flow hedges and adjustments due to fair value valuation do not add value relevance to the net income.

  4. Resultados del uso de geodesia satelital para estudios geodinámicos en Colombia

    Directory of Open Access Journals (Sweden)

    Mora-Páez Hector

    2002-08-01

    derivadas de las campañas de GPS efectuadas en 1988, 1990, 1991, 1994, 1996 y 1998 como parte del proyecto de GPS denominado CASA. (Central And South América. La zona de estudio comprende el área de compleja interacción de las placas Caribe, Nazca y Suramérica, Las mismas estaciones GPS han sido ocupadas con el propósito de hacer comparaciones en la posición de cada sitio, analizando distancias de separación (líneas base y obteniendo vectores de desplazamientos (magnitud y orientación. Se muestran algunos resultados obtenidos usando el software GIPSY -OASIS II, un paquete de precisión para el análisis de datos GPS, desarrollado par JPL-NASA. Ingeominas ha establecido en Colombia una red de estaciones GPS, denominada GEORED, para efectuar ocupaciones sucesivas y obtener información de deformación  intraplaca, bajo el proyecto institucional denominado Levantamiento, Compilación y Generación de Informacion de Informacion Geodinámica.

  5. Inversion of GPS meteorology data

    Directory of Open Access Journals (Sweden)

    K. Hocke

    Full Text Available The GPS meteorology (GPS/MET experiment, led by the Universities Corporation for Atmospheric Research (UCAR, consists of a GPS receiver aboard a low earth orbit (LEO satellite which was launched on 3 April 1995. During a radio occultation the LEO satellite rises or sets relative to one of the 24 GPS satellites at the Earth's horizon. Thereby the atmospheric layers are successively sounded by radio waves which propagate from the GPS satellite to the LEO satellite. From the observed phase path increases, which are due to refraction of the radio waves by the ionosphere and the neutral atmosphere, the atmospheric parameter refractivity, density, pressure and temperature are calculated with high accuracy and resolution (0.5–1.5 km. In the present study, practical aspects of the GPS/MET data analysis are discussed. The retrieval is based on the Abelian integral inversion of the atmospheric bending angle profile into the refractivity index profile. The problem of the upper boundary condition of the Abelian integral is described by examples. The statistical optimization approach which is applied to the data above 40 km and the use of topside bending angle profiles from model atmospheres stabilize the inversion. The retrieved temperature profiles are compared with corresponding profiles which have already been calculated by scientists of UCAR and Jet Propulsion Laboratory (JPL, using Abelian integral inversion too. The comparison shows that in some cases large differences occur (5 K and more. This is probably due to different treatment of the upper boundary condition, data runaways and noise. Several temperature profiles with wavelike structures at tropospheric and stratospheric heights are shown. While the periodic structures at upper stratospheric heights could be caused by residual errors of the ionospheric correction method, the periodic temperature fluctuations at heights below 30 km are most likely caused by atmospheric waves (vertically

  6. GPS test range mission planning

    Science.gov (United States)

    Roberts, Iris P.; Hancock, Thomas P.

    The principal features of the Test Range User Mission Planner (TRUMP), a PC-resident tool designed to aid in deploying and utilizing GPS-based test range assets, are reviewed. TRUMP features time history plots of time-space-position information (TSPI); performance based on a dynamic GPS/inertial system simulation; time history plots of TSPI data link connectivity; digital terrain elevation data maps with user-defined cultural features; and two-dimensional coverage plots of ground-based test range assets. Some functions to be added during the next development phase are discussed.

  7. Primeros registros de la cotorra argentina (Myiopsitta monachus en el estado de Hidalgo, México

    Directory of Open Access Journals (Sweden)

    Iriana Zuria

    2017-04-01

    Full Text Available La cotorra argentina (Myiopsitta monachus es una especie de ave exótica e invasora en México. En esta nota presentamos los primeros registros de esta especie en el estado de Hidalgo. Observamos individuos adultos y nidos activos desde 2011 en dos ciudades de la entidad: Huejutla y Pachuca. Los nidos en Huejutla los ubicamos tanto en una galera metálica como en una antena de telefonía, mientras que en Pachuca un nido estaba en una yuca dentro de un campo de golf. La presencia de nidos activos indica que la especie está en proceso de establecerse en la entidad. La distribución de la cotorra argentina se ha incrementado de manera significativa en México ya que actualmente se tienen registros en 23 entidades del país.

  8. Implementing GPS into Pave-IR.

    Science.gov (United States)

    2009-03-01

    To further enhance the capabilities of the Pave-IR thermal segregation detection system developed at the Texas Transportation Institute, researchers incorporated global positioning system (GPS) data collection into the thermal profiles. This GPS capa...

  9. GPS operations at Olkiluoto in 2011

    Energy Technology Data Exchange (ETDEWEB)

    Koivula, H.; Kallio, U.; Nyberg, S.; Jokela, J.; Poutanen, M. [Finnish Geodetic Institute, Masala (Finland)

    2012-06-15

    The Finnish Geodetic Institute has studied crustal deformations at Olkiluoto, Kivetty and Romuvaara in co-operation with Posiva Oy since 1995. At Olkiluoto a total of 32 GPS campaigns have been carried out at inner network since 1995 and 17 campaigns at outer network since 2003. Kivetty and Romuvaara were not measured in 2011. In the Olkiluoto inner network 80 percent of the estimated change rates are smaller than 0.10 mm/a. One third of the change rates are statistically significant. They are mainly related to the Olkiluoto permanent station (GPS1) and to the pillars GPS6 and GPS13. The change rates related to GPS6 are not realistic due to the site-specific changes affecting the time series. The maximum change rate (-0.20 mm/a {+-} 0.05 mm/a) is related to GPS13. The time series of GPS13 is half the length of other pillars and therefore, the change rates are more uncertain. In the Olkiluoto outer network the maximum and statistically significant change rate is between GPS1-GPS11 (0.39 mm/a {+-} 0.06 mm/a). Pillar GPS12 was not observed this year. The change rates of baselines GPS1-GPS14 and GPS1-GPS15 are first time statistically significant. The change rates indicate a small movement of the GPS1 pillar. The baseline GPS1-GPS11 crosses an old fracture zone locating in the direction of the Eurajoensalmi, which might be a reason for the deformation. On the other hand, the Onkalo excavations in the vicinity of the Olkiluoto permanent station (GPS1) may cause some movement. Electronic distance measurements have been performed at Olkiluoto at the baseline GPS7-GPS8 using the Mekometer since 2002. The measurements have been carried out simultaneously with GPS campaigns. Based on 19 measurements in 10 years, the trends of the two time series seems to be similar. Due to unmodelled or dismodelled geometrical offsets and the scale difference between GPS measurements and EDM there is about 0.3 mm difference between distances GPS7-GPS8 derived from GPS measurements and EDM

  10. GPS operations at Olkiluoto in 2011

    International Nuclear Information System (INIS)

    Koivula, H.; Kallio, U.; Nyberg, S.; Jokela, J.; Poutanen, M.

    2012-06-01

    The Finnish Geodetic Institute has studied crustal deformations at Olkiluoto, Kivetty and Romuvaara in co-operation with Posiva Oy since 1995. At Olkiluoto a total of 32 GPS campaigns have been carried out at inner network since 1995 and 17 campaigns at outer network since 2003. Kivetty and Romuvaara were not measured in 2011. In the Olkiluoto inner network 80 percent of the estimated change rates are smaller than 0.10 mm/a. One third of the change rates are statistically significant. They are mainly related to the Olkiluoto permanent station (GPS1) and to the pillars GPS6 and GPS13. The change rates related to GPS6 are not realistic due to the site-specific changes affecting the time series. The maximum change rate (-0.20 mm/a ± 0.05 mm/a) is related to GPS13. The time series of GPS13 is half the length of other pillars and therefore, the change rates are more uncertain. In the Olkiluoto outer network the maximum and statistically significant change rate is between GPS1-GPS11 (0.39 mm/a ± 0.06 mm/a). Pillar GPS12 was not observed this year. The change rates of baselines GPS1-GPS14 and GPS1-GPS15 are first time statistically significant. The change rates indicate a small movement of the GPS1 pillar. The baseline GPS1-GPS11 crosses an old fracture zone locating in the direction of the Eurajoensalmi, which might be a reason for the deformation. On the other hand, the Onkalo excavations in the vicinity of the Olkiluoto permanent station (GPS1) may cause some movement. Electronic distance measurements have been performed at Olkiluoto at the baseline GPS7-GPS8 using the Mekometer since 2002. The measurements have been carried out simultaneously with GPS campaigns. Based on 19 measurements in 10 years, the trends of the two time series seems to be similar. Due to unmodelled or dismodelled geometrical offsets and the scale difference between GPS measurements and EDM there is about 0.3 mm difference between distances GPS7-GPS8 derived from GPS measurements and EDM. It is

  11. Location - Global Positioning System (GPS) Photos

    Data.gov (United States)

    Army Corps of Engineers, Department of the Army, Department of Defense — Digital photos tagged with GPS location information. The St. Paul District maintains a digital library of over 10,000 GPS photos. Photos are often associated with...

  12. Contents of GPS Data Files

    Energy Technology Data Exchange (ETDEWEB)

    Sullivan, John P. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Carver, Matthew Robert [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Norman, Benjamin [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2016-12-09

    There are no very detailed descriptions of most of these instruments in the literature – we will attempt to fix that problem in the future. The BDD instruments are described in [1]. One of the dosimeter instruments on CXD boxes is described in [2]. These documents (or web links to them) and a few others are in this directory tree. The cross calibration of the CXD electron data with RBSP is described in [3]. Each row in the data file contains the data from one time bin from a CXD or BDD instrument along with a variety of parameters derived from the data. Time steps are commandable but 4 minutes is a typical setting. These instruments are on many (but not all) GPS satellites which are currently in operation. The data come from either BDD instruments on GPS Block IIR satellites (SVN41 and 48), or else CXD-IIR instruments on GPS Block IIR and IIR-M satellites (SVN53-61) or CXD-IIF instruments on GPS block IIF satellites (SVN62-73). The CXD-IIR instruments on block IIR and IIR(M) satellites use the same design.

  13. Continuous professional development for GPs

    DEFF Research Database (Denmark)

    Kjaer, N K; Steenstrup, A P; Pedersen, L B

    2014-01-01

    out to identify GPs' current use of CPD and to explore the motives behind their choices. METHODS: A mixed-methods study with a combined qualitative and quantitative approach was used. In 2012, two focus group interviews were conducted, followed up the same year by an online questionnaire sent to 1079...

  14. Tracking Small Satellites using Translated GPS

    OpenAIRE

    Lefevre, Don; Mulally, Daniel

    1991-01-01

    This paper discusses using translated GPS for tracking small satellites, the technical trade-offs involved, and the position and timing accuracies which are achievable using translated GPS. The Global Positioning System (GPS) uses the relative times-of-arrival of multiple spread-spectrum signals at an antenna to determine the position of the antenna. The system can also determine the time the antenna was at that position. The direct sequence spread spectrum signals are transmitted from GPS sa...

  15. The SMS-GPS-Trip-Method

    DEFF Research Database (Denmark)

    Reinau, Kristian Hegner; Harder, Henrik; Weber, Michael

    2015-01-01

    This article presents a new method for collecting travel behavior data, based on a combination of GPS tracking and SMS technology, coined the SMS–GPS-Trip method. The state-of-the-art method for collecting data for activity based traffic models is a combination of travel diaries and GPS tracking...

  16. Integrated navigation of aerial robot for GPS and GPS-denied environment

    International Nuclear Information System (INIS)

    Suzuki, Satoshi; Min, Hongkyu; Nonami, Kenzo; Wada, Tetsuya

    2016-01-01

    In this study, novel robust navigation system for aerial robot in GPS and GPS- denied environments is proposed. Generally, the aerial robot uses position and velocity information from Global Positioning System (GPS) for guidance and control. However, GPS could not be used in several environments, for example, GPS has huge error near buildings and trees, indoor, and so on. In such GPS-denied environment, Laser Detection and Ranging (LIDER) sensor based navigation system have generally been used. However, LIDER sensor also has an weakness, and it could not be used in the open outdoor environment where GPS could be used. Therefore, it is desired to develop the integrated navigation system which is seamlessly applied to GPS and GPS-denied environments. In this paper, the integrated navigation system for aerial robot using GPS and LIDER is developed. The navigation system is designed based on Extended Kalman Filter, and the effectiveness of the developed system is verified by numerical simulation and experiment. (paper)

  17. Descripción de la hembra de Copaxa ignescens (Lepidoptera: Saturniidae, con anotaciones sobre sus primeros estadios inmaduros

    Directory of Open Access Journals (Sweden)

    Amarillo S. Angela R.

    1997-06-01

    Full Text Available The female of Copaxa ignescens Lemaire, 1978 (Saturniidae is described and notes on the first three larval instars are presented. The caterpillars were reared on Avocado (Persea americana Miller.Se describe la hembra de Copaxa ignescens Lemaire, 1978 (Saturniidae y se hacen anotaciones sobre los tres primeros estadios larvales. Las orugas se criaron con Aguacate (Persaa americana Miller.

  18. La precariedad: el resultado de 11 contradicciones

    Directory of Open Access Journals (Sweden)

    Antonio Gómez Villar

    2017-12-01

    Full Text Available Proponemos pensar la precariedad como el resultado de 11 contradicciones, esto es, atravesando bloqueos, puntos de crisis, rupturas, apertura de nuevos planos y líneas de fuga inmanentes a la nueva configuración del trabajo postfordista. En cada contradicción podemos reconocer muchos de los medios que tenemos a nuestra disposición para articular proyectos de liberación del capital, para crear instituciones e institucionalidades que posibiliten el que consideramos el mayor de los legados de la teoría (postoperaista: la posibilidad que tiene el conocimiento de devenir autónomo.

  19. Resultados do tratamento da pancreatite aguda grave

    Directory of Open Access Journals (Sweden)

    Franz Robert Apodaca-Torrez

    Full Text Available OBJETIVO: Avaliar os resultados do Protocolo de Atendimento de pacientes com diagnóstico de pancreatite aguda grave. MÉTODOS: Foram analisados, consecutivamente, a partir de janeiro de 2002, idade, sexo, etiologia, tempo de internação, tipo de tratamento e mortalidade de 37 pacientes portadores de pancreatite aguda grave. RESULTADOS: A idade dos pacientes variou de 20 a 88 anos (média de 50 anos; 27% foram do sexo feminino e 73% do masculino. O tempo médio global de internação foi 47 dias. Treze pacientes foram tratados cirurgicamente; a média de operações realizadas foi duas por paciente. Ocorreram seis óbitos dentre os pacientes submetidos ao tratamento cirúrgico (46% e dois óbitos no grupo submetido somente ao tratamento clínico (8,3%. A mortalidade global foi 21% CONCLUSÃO: Após a modificação na forma de abordagem dos pacientes com pancreatite aguda grave, houve diminuição da mortalidade e uma tendência para a conduta expectante.

  20. Ionospheric Scintillation Effects on GPS

    Science.gov (United States)

    Steenburgh, R. A.; Smithtro, C.; Groves, K.

    2007-12-01

    . Ionospheric scintillation of Global Positioning System (GPS) signals threatens navigation and military operations by degrading performance or making GPS unavailable. Scintillation is particularly active, although not limited to, a belt encircling the earth within 20 degrees of the geomagnetic equator. As GPS applications and users increases, so does the potential for detrimental impacts from scintillation. We examined amplitude scintillation data spanning seven years from Ascension Island, U.K.; Ancon, Peru; and Antofagasta, Chile in the Atlantic/Americas longitudinal sector at as well as data from Parepare, Indonesia; Marak Parak, Malaysia; Pontianak, Indonesia; Guam; and Diego Garcia, U.K.; in the Pacific longitudinal sector. From these data, we calculate percent probability of occurrence of scintillation at various intensities described by the S4 index. Additionally, we determine Dilution of Precision at one minute resolution. We examine diurnal, seasonal and solar cycle characteristics and make spatial comparisons. In general, activity was greatest during the equinoxes and solar maximum, although scintillation at Antofagasta, Chile was higher during 1998 rather than at solar maximum.

  1. GPS-Aided Video Tracking

    Directory of Open Access Journals (Sweden)

    Udo Feuerhake

    2015-08-01

    Full Text Available Tracking moving objects is both challenging and important for a large variety of applications. Different technologies based on the global positioning system (GPS and video or radio data are used to obtain the trajectories of the observed objects. However, in some use cases, they fail to provide sufficiently accurate, complete and correct data at the same time. In this work we present an approach for fusing GPS- and video-based tracking in order to exploit their individual advantages. In this way we aim to combine the reliability of GPS tracking with the high geometric accuracy of camera detection. For the fusion of the movement data provided by the different devices we use a hidden Markov model (HMM formulation and the Viterbi algorithm to extract the most probable trajectories. In three experiments, we show that our approach is able to deal with challenging situations like occlusions or objects which are temporarily outside the monitored area. The results show the desired increase in terms of accuracy, completeness and correctness.

  2. Historias de dictadura. Primeros cuentos de Sergio Ramírez

    Directory of Open Access Journals (Sweden)

    María del Pilar Ríos

    2017-07-01

    Full Text Available Los primeros textos del escritor nicaragüense Sergio Ramírez presentan algunos elementos que conforman, a manera de mosaico, los principales rasgos de la vida individual y social durante la larga dictadura somocista (1936 – 1979. Poder, violencia, dependencia política, social y económica son algunas de las problemáticas que asoman y su tratamiento se acentúa o modifica entre una publicación y otra más allá del orden de aparición. Asimismo, en el marco de las luchas por la liberación encabezadas por el Frente Sandinista de Liberación Nacional (FSLN, se cuestiona la función del arte y del intelectual. Propongo una serie de cuentos incluidos en Cuentos (1963, Nuevos Cuentos (1969 y Charles Atlas también muere (1976 en la que reviso, en primera instancia, la postura en torno al arte y al intelectual que exponen mediante la autofiguración del autor. Luego, exploro algunos elementos que conforman esos mundos narrativos y que funcionan como denuncia político-social al mismo tiempo que imaginan y reivindican una nueva nación en sintonía con los postulados presentes en las luchas revolucionarias.

  3. ¿Quiénes fueron y qué hacen nuestros primeros profesionales?

    Directory of Open Access Journals (Sweden)

    María Velásquez Moreno

    2011-12-01

    Full Text Available Formar profesionales en la Administración de empresas y Economía, fue un reto para la educación de aquellos tiempos. La Facultad  de Ciencias Administrativas y Económicas, fue creada  con  profunda visión de aportar en  áreas   del conocimiento   científico,   económico, administrativo,   financieros,   dinamizador   de   la producción de bienes y servicios   a través de funciones gerenciales, en haras de cubrir las expectativas del pais que ya proyectaba cambio   de época;  desarrollar proyectos, planes y estructuras en su organización,  que permita   el   crecimiento   sostenido   del profesional graduado ha sido una meta cumplida, razón que permite demostrar a través de este articulo investigativo, donde están laborando y quienes fueron   los primeros frutos graduados en este templo del conocimiento.

  4. De los primeros animales domesticados en Euskal Herria a las razas actuales

    Directory of Open Access Journals (Sweden)

    Mariano Gómez

    2005-01-01

    Full Text Available Para los que trabajamos en el estudio, conservación y recuperación de las razas autóctonas los trabajos de Jesús Altuna son fundamentales por tener un completo trabajo sobre cómo eran nuestros primeros animales domésticos y con ellos el origen de las razas autóctonas que conocemos en la actualidad. Además el papel del perro de pastor en el mesolítico, como herramienta para el ser humano en las labores cinegéticas, se convirtió en el pastoreo en la ayuda y compañía imprescindible para los humanos en la domesticación del resto de las especies que hoy conocemos como ganaderas. Sirva esta pequeña aportación de reconocimiento y homenaje a la gran labor aportada por el profesor Altuna y el gran legado que nos aporta en los trabajos de conservación de las razas.

  5. Enfermedad de Kennedy en el Perú: Primeros casos con diagnóstico molecular

    Directory of Open Access Journals (Sweden)

    Víctor Gómez-Calero

    Full Text Available La enfermedad de Kennedy es un trastorno neurodegenerativo de herencia recesiva ligada al cromosoma X, de inicio en la adultez, caracterizado por degeneración progresiva de las neuronas motoras espinales, debido a una mutación dinámica del gen del receptor de andrógeno. Se presentan tres familias (cinco casos con temblor, calambres, debilidad muscular generalizada lentamente progresiva con atrofia, afectación de músculos bulbares y alteraciones endocrinas. El estudio neurofisiológico demostró compromiso de segunda motoneurona. El análisis molecular mostró una expansión anormal de tripletes citosina-adenina-guanina en el gen de receptor de andrógeno en todos los casos. Todos los pacientes cursaron con una presentación clínica típica de la enfermedad siendo los primeros casos de enfermedad de Kennedy con diagnóstico molecular realizado en el Perú.

  6. GPS deformation measurements at Olkiluoto in 2013

    International Nuclear Information System (INIS)

    Nyberg, S.; Kallio, U.; Koivula, H.

    2014-08-01

    The Finnish Geodetic Institute has monitored crustal deformations since mid-1990s at Olkiluoto, Kivetty and Romuvaara. The research was focused on the Olkiluoto area in 2001, when Olkiluoto was chosen to the site for the final disposal facility of the spent nuclear fuel. The work and the results of the GPS deformation monitoring at Olkiluoto in 2013 are presented. The measurement consisted of two GPS measurement campaigns, observations at local permanent stations and control markers measurements at four stations. In spring six new stations were set up for permanent tracking. In total 12 permanent stations were operating continuously from April to the end of the year. The residual time series of the stations showed periodic trends up to 3 mm in height and 1 mm in horizontal component relative to the GPS1 station. A few stations were still measured as campaign-based and analysed baseline by baseline. The data from permanent stations (GPS1-GPS9, and GPS13) were included. The analysis of the inner network based on campaign sessions showed very small motions as in previous years: 75 % of change rates are smaller than 0.10 mm/y. Roughly one third of the change rates could be considered statistically significant at 1 % significance level. Statistically significant change rates were estimated for baselines from GPS1 and GPS5. The trends and strains differed at some baselines clearly from the earlier analysis because of different troposphere modelling. The results of the outer network showed the largest difference on the baseline GPS1-GPS11 where the trend decreased from -0.42 mm/y to -0.28 mm/y. The strain pattern of the outer network shows an eastwards motion of GPS1. The estimated strains for the baselines east of GPS1 were -0.03/-0.04 ppm/y. The control marker measurements were carried at the stations GPS1, GPS2, GPS4 and GPS6. A comparison of the results with the previous measurements showed that the distance between control markers at GPS6 continues to increase. Also

  7. GPS deformation measurements at Olkiluoto in 2013

    Energy Technology Data Exchange (ETDEWEB)

    Nyberg, S.; Kallio, U.; Koivula, H. [Finnish Geodetic Institute, Masala (Finland)

    2014-08-15

    The Finnish Geodetic Institute has monitored crustal deformations since mid-1990s at Olkiluoto, Kivetty and Romuvaara. The research was focused on the Olkiluoto area in 2001, when Olkiluoto was chosen to the site for the final disposal facility of the spent nuclear fuel. The work and the results of the GPS deformation monitoring at Olkiluoto in 2013 are presented. The measurement consisted of two GPS measurement campaigns, observations at local permanent stations and control markers measurements at four stations. In spring six new stations were set up for permanent tracking. In total 12 permanent stations were operating continuously from April to the end of the year. The residual time series of the stations showed periodic trends up to 3 mm in height and 1 mm in horizontal component relative to the GPS1 station. A few stations were still measured as campaign-based and analysed baseline by baseline. The data from permanent stations (GPS1-GPS9, and GPS13) were included. The analysis of the inner network based on campaign sessions showed very small motions as in previous years: 75 % of change rates are smaller than 0.10 mm/y. Roughly one third of the change rates could be considered statistically significant at 1 % significance level. Statistically significant change rates were estimated for baselines from GPS1 and GPS5. The trends and strains differed at some baselines clearly from the earlier analysis because of different troposphere modelling. The results of the outer network showed the largest difference on the baseline GPS1-GPS11 where the trend decreased from -0.42 mm/y to -0.28 mm/y. The strain pattern of the outer network shows an eastwards motion of GPS1. The estimated strains for the baselines east of GPS1 were -0.03/-0.04 ppm/y. The control marker measurements were carried at the stations GPS1, GPS2, GPS4 and GPS6. A comparison of the results with the previous measurements showed that the distance between control markers at GPS6 continues to increase. Also

  8. Applications of GPS technologies to field sports.

    Science.gov (United States)

    Aughey, Robert J

    2011-09-01

    Global positioning system (GPS) technology was made possible after the invention of the atomic clock. The first suggestion that GPS could be used to assess the physical activity of humans followed some 40 y later. There was a rapid uptake of GPS technology, with the literature concentrating on validation studies and the measurement of steady-state movement. The first attempts were made to validate GPS for field sport applications in 2006. While GPS has been validated for applications for team sports, some doubts continue to exist on the appropriateness of GPS for measuring short high-velocity movements. Thus, GPS has been applied extensively in Australian football, cricket, hockey, rugby union and league, and soccer. There is extensive information on the activity profile of athletes from field sports in the literature stemming from GPS, and this includes total distance covered by players and distance in velocity bands. Global positioning systems have also been applied to detect fatigue in matches, identify periods of most intense play, different activity profiles by position, competition level, and sport. More recent research has integrated GPS data with the physical capacity or fitness test score of athletes, game-specific tasks, or tactical or strategic information. The future of GPS analysis will involve further miniaturization of devices, longer battery life, and integration of other inertial sensor data to more effectively quantify the effort of athletes.

  9. Resultados em e-Learning corporativo

    OpenAIRE

    Cardoso, Fernando de Carvalho

    2011-01-01

    As empresas estão ampliando muito a utilização do e-learning em seus processos de educação corporativa, este trabalho iniciou-se na busca para responder quais são os impactos da implementação do e-Learning no processo educacional nas corporações. Esta dissertação de mestrado apresenta um estudo dos resultados das ações de e-learning e o contexto em que este está inserido, nas corporações e na sociedade. Para tanto foram utilizados autores que falam sobre educação, educação corporativa, ...

  10. Doctor Octavio Montoro y los primeros casos de diabetes tratados con insulina en Cuba Doctor Octavio Montoro and the first cases of diabetes treated with insulin in Cuba

    Directory of Open Access Journals (Sweden)

    Dagoberto Álvarez Aldana

    2003-08-01

    Full Text Available El uso clínico de la insulina por Banting y Best representa un hito en la historia de las ciencias médicas. Los avances en este campo han sido espectaculares y nuestro país no está ajeno a ellos. Sin embargo, poco se conoce sobre los primeros trabajos realizados por los médicos cubanos en relación con la insulinoterapia, hecho trascendental en la historia de la endocrinología cubana, pero desconocido principalmente para las nuevas generaciones de endocrinólogos. Esta revisión tiene como objetivos destacar la introducción en la clínica moderna de la insulina como un importante suceso en la historiografía médica cubana y divulgar la evolución clínica y el esquema terapéutico aplicado a los primeros casos de diabetes mellitus tratados con insulina en Cuba, así como resaltar el empeño y la capacidad de los profesionales de la salud pioneros en el uso clínico de la insulina en aquellos años, entre los que se destaca el Doctor Octavio Montoro. Para realizar este trabajo fue consultada la bibliografía médica de la época, archivos y otras fuentes. Como resultado se obtuvo que en Cuba se introdujo la insulina en el tratamiento de los pacientes diabéticos en febrero de 1923, por el Doctor Montoro, quien fue reconocido por sus conocimientos médicos y por su vasta cultura. Desempeñó múltiples cargos y recibió numerosas condecoraciones. Se concluyó que Cuba fue uno de los primeros países en el mundo que contó con la insulina como arma terapéutica contra la diabetes. El Doctor Octavio Montoro hizo importantes aportes en la investigación sobre la diabetes, por lo que merece ser considerado, a nuestro juicio, como el padre de la diabetología en nuestro país.The clinical use of insulin by Banting and Best represents a hallmark in the history of medical sciences. The advances in this field have been amazing and our country was also involved in this development. However, little is known about the first works carried out by Cuban

  11. GPS in Travel and Activity Surveys

    DEFF Research Database (Denmark)

    Nielsen, Thomas Alexander Sick; Hovgesen, Henrik Harder

    2004-01-01

    The use of GPS-positioning as a monitoring tool in travel and activity surveys opens up a range of possibilities. Using a personal GPS device, the locations and movements of respondents can be followed over a longer period of time. It will then be possible to analyse how the use of urban spaces...... are embedded in the wider context of activity patterns (work, school etc.). The general pattern of everyday itineraries, including route choice and time spent at different locations ?on the way? can also be analysed. If the personal GPS device is combined with an electronic questionnaire, for example...... area. The paper presents the possibilities in travel and activity surveys with GPS and electronic questionnaires. Demonstrative mapping of test data from passive GPS registration of Copenhagen respondents is presented. The different survey possibilities given a combination of GPS and PDA based...

  12. Miniaturized GPS/MEMS IMU integrated board

    Science.gov (United States)

    Lin, Ching-Fang (Inventor)

    2012-01-01

    This invention documents the efforts on the research and development of a miniaturized GPS/MEMS IMU integrated navigation system. A miniaturized GPS/MEMS IMU integrated navigation system is presented; Laser Dynamic Range Imager (LDRI) based alignment algorithm for space applications is discussed. Two navigation cameras are also included to measure the range and range rate which can be integrated into the GPS/MEMS IMU system to enhance the navigation solution.

  13. GPS User Devices Parameter Control Methods

    OpenAIRE

    Klūga, A; Kuļikovs, M; Beļinska, V; Zeļenkovs, A

    2007-01-01

    In our day’s wide assortment of GPS user devices is manufacture. How to verify that parameters of the real device corresponds to parameters that manufacture shows. How to verify that parameters have not been changed during the operation time. The last one is very important for aviation GPS systems, which must be verified before the flight, but the values of parameter in time of repair works. This work analyses GPS user devices parameters control methods.

  14. The GPS Laser Retroreflector Array Project

    Science.gov (United States)

    Merkowitz, Stephen M.

    2012-01-01

    Systematic co-location in space through the precision orbit determination of GPS satellites via satellite laser ranging will contribute significantly towards improving the accuracy and stability of the international terrestrial reference frame. NASA recently formed the GPS Laser Retroreflector Array Project to develop and deliver retroreflectors for integration on the next generation of GPS satellites. These retroreflectors will be an important contributor to achieving a global accuracy of 1.0 mm and 0.1 mm/year stability in the international terrestrial reference frame. We report here the current status of the GPS Laser Retroreflector Array Project.

  15. GPS operations at Olkiluoto in 2009

    Energy Technology Data Exchange (ETDEWEB)

    Kallio, U.; Nyberg, S.; Koivula, H.; Jokela, J.; Poutanen, M.; Ahola, J. (Finnish Geodetic Institute, Masala (Finland))

    2010-06-15

    The GPS based deformation studies have been made at the investigation areas of Posiva since 1995, when the network of ten GPS pillars was established at Olkiluoto. One pillar in the investigation area belongs to the Finnish permanent GPS network, FinnRef. 28 GPS measurement campaigns have been carried out at Olkiluoto since 1995. According to the time series of the GPS results 1/3 of the baselines at Olkiluoto have statistically significant change rates. However, the observed movements are smaller than +-0.20 mm/a. There are five pillars, which have statistically significant horizontal velocities at Olkiluoto. These local velocity components are small but taking into account the standard deviations the largest velocity components seems to be reliably determined. At Olkiluoto a baseline for electronic distance measurements (EDM) was built in 2002. The baseline has been measured using EDM instruments in connection to the GPS observations. Changes in he difference between the GPS and EDM results indicate the systematic change in GPS results. No corrections based on only one baseline were not applied to GPS vectors. The GPS network at Olkiluoto was extended in 2003. The new pillars were built close to Kuivalahti village and on a small island of Iso Pyrekari. According to the geological evidence it is expected that a fracture zone is located between the new stations, thus enabling the determination of possible deformations along the fracture zone. The new pillars have been observed since 2003 and now we have computed the first deformation analysis from the six years data. Four new permanent stations will be established in summer 2010 at Olkiluoto. We have automated the processing of the campaign data by using the Bernese processing engine (BPE) together with our own Perl scripts. The local crustal deformations have been studied in GeoSatakunta project, too. This GPS network is located in Cities of Pori and Rauma and their neighbouring municipalities. Two new pillars

  16. GPS operations at Olkiluoto in 2009

    International Nuclear Information System (INIS)

    Kallio, U.; Nyberg, S.; Koivula, H.; Jokela, J.; Poutanen, M.; Ahola, J.

    2010-06-01

    The GPS based deformation studies have been made at the investigation areas of Posiva since 1995, when the network of ten GPS pillars was established at Olkiluoto. One pillar in the investigation area belongs to the Finnish permanent GPS network, FinnRef. 28 GPS measurement campaigns have been carried out at Olkiluoto since 1995. According to the time series of the GPS results 1/3 of the baselines at Olkiluoto have statistically significant change rates. However, the observed movements are smaller than ±0.20 mm/a. There are five pillars, which have statistically significant horizontal velocities at Olkiluoto. These local velocity components are small but taking into account the standard deviations the largest velocity components seems to be reliably determined. At Olkiluoto a baseline for electronic distance measurements (EDM) was built in 2002. The baseline has been measured using EDM instruments in connection to the GPS observations. Changes in he difference between the GPS and EDM results indicate the systematic change in GPS results. No corrections based on only one baseline were not applied to GPS vectors. The GPS network at Olkiluoto was extended in 2003. The new pillars were built close to Kuivalahti village and on a small island of Iso Pyrekari. According to the geological evidence it is expected that a fracture zone is located between the new stations, thus enabling the determination of possible deformations along the fracture zone. The new pillars have been observed since 2003 and now we have computed the first deformation analysis from the six years data. Four new permanent stations will be established in summer 2010 at Olkiluoto. We have automated the processing of the campaign data by using the Bernese processing engine (BPE) together with our own Perl scripts. The local crustal deformations have been studied in GeoSatakunta project, too. This GPS network is located in Cities of Pori and Rauma and their neighbouring municipalities. Two new pillars

  17. GRUPOS INTERACTIVOS EN AULA Y EL INCREMENTO DE LOS RESULTADOS DE APRENDIZAJE EN LENGUAJE EN UN COLEGIO VULNERABLE

    Directory of Open Access Journals (Sweden)

    Marcela Núñez Solís

    Full Text Available RESUMEN: Este artículo presenta los resultados de un estudio realizado entre los años 2013 y 2014 en un colegio vulnerable2 en Los Ángeles, Chile. Ese estudio consistió en la incorporación de grupos interactivos en aula en primero básico3 en Lenguaje. El objetivo fue determinar el incremento de los resultados de aprendizaje en dicha área. Se utilizó un enfoque cuantitativo, con diseño preexperimental y aplicación de CL-PT4 en el nivel señalado, antes y después de la intervención. El trabajo, además, consideró la incorporación en aula de colaboradores de aprendizaje: apoderados, alumnos de cursos superiores del mismo colegio, alumnas de pregrado y docentes de la Universidad. Los grupos interactivos involucran un cambio de paradigma que conlleva un fuerte compromiso social. Los resultados indican que se produjo un incremento significativo entre el pretest y postest (CL-PT, lo que implicó una mejora en el desarrollo del lenguaje.

  18. Latinobarómetro 1997: Principales resultados

    Directory of Open Access Journals (Sweden)

    Ismael CRESPO

    2009-11-01

    Full Text Available RESUMEN: El latinobarómetro es quizá la encuesta de opinión pública más importante que, cada año, analiza conjuntamente la realidad latinoamericana y española y que, además, permite la comparación de indicadores entre 18 países. Lo que se nos presenta a continuación son comentarios a los principales resultados extraídos en 1997, comparados con los obtenidos el año anterior, sobre aspectos como el desarrollo político e institucional y el estado de la democracia, junto a otras valoraciones de la realidad económica; ofreciéndonos, con ello, una clara descripción de la evolución de la opinión pública en estos países. Palabras clave: Latinobarómetro, opinión pública.ABSTRACT: The "latin-barometer" is perhaps the most important public opinion survey which analysies the latinamerican and the spanish situation together each year. Moreover it allows the comparition of indicators between eighteen countries. This paper shows the main results obtained during 1997. These results are compared with wihic were obtained on 1996. It comparies issues such as the instituctional and political development and the conditios of democracy; it linked to other valuations of the economic situation. These data offer us a clear description about the evoluction of public opinion in these countries.

  19. GPS queues with heterogeneous traffic classes

    NARCIS (Netherlands)

    Borst, Sem; Mandjes, M.R.H.; van Uitert, Miranda

    2002-01-01

    We consider a queue fed by a mixture of light-tailed and heavy-tailed traffic. The two traffic classes are served in accordance with the generalized processor sharing (GPS) discipline. GPS-based scheduling algorithms, such as weighted fair queueing (WFQ), have emerged as an important mechanism for

  20. Convective towers detection using GPS radio occultations

    DEFF Research Database (Denmark)

    Biondi, Riccardo; Neubert, Torsten; Syndergaard, S.

    the GPS signals penetrate through clouds and allow measurements of atmospheric profiles related to temperature, pressure, and water vapour with high vertical resolution. Using tropical cyclone best track database and data from different GPS RO missions (COSMIC, GRACE, CHAMP, SACC and GPSMET), we selected...

  1. Gestió mapes i GPS

    OpenAIRE

    Díaz Sañudo, Daniel

    2013-01-01

    El projecte denominat "Gestor de mapes i GPS" és una aplicació per a dispositius mòbils Android que utilitza l'API v.1 de Google Maps. El proyecto denominado "Gestor de mapas y GPS" es una aplicación para dispositivos móviles Android que utiliza la API v.1 de Google Maps.

  2. Development of GPS survey data management protocols/policy.

    Science.gov (United States)

    2010-08-01

    This project developed a statewide policy and criteria for collecting, analyzing, and managing global position system (GPS) survey data. The research project determined the needs of the Department in adopting the GPS real time kinetic (GPS RTK) stake...

  3. Comparison of GLONASS and GPS Time Transfers

    Science.gov (United States)

    Daly, P.; Koshelyaevsky, N. B.; Lewandowski, W.; Petit, G.; Thomas, C.

    1993-01-01

    The Russian global space navigation system GLONASS could provide a technique similar to GPS for international time comparison. The main limitation to its use for time transfer is the lack of commercially available time receivers. The University of Leeds built a GPS/GLONASS receiver five years ago and since then has provided continuous information about GLONASS time and its comparison with GPS time. For the last two years the VNIIFTRI and several other Russian time laboratories have used Russian-built GLONASS navigation receivers for time comparisons. Since June 1991, the VNIIFTRI has operated a GPS time receiver which offers, for the first time, an opportunity for the direct comparison of time transfers using GPS and GLONASS. This seven-month experiment shows that even with relatively imprecise data recording and processing, in terms of time metrology, GLONASS can provide continental time transfer at a level of several tens of nanoseconds.

  4. GPS Precision Timing at CERN

    CERN Document Server

    Beetham, C G

    1999-01-01

    For the past decade, the Global Positioning System (GPS) has been used to provide precise time, frequency and position co-ordinates world-wide. Recently, equipment has become available specialising in providing extremely accurate timing information, referenced to Universal Time Co-ordinates (UTC). This feature has been used at CERN to provide time of day information for systems that have been installed in the Proton Synchrotron (PS), Super Proton Synchrotron (SPS) and the Large Electron Positron (LEP) machines. The different systems are described as well as the planned developments, particularly with respect to optical transmission and the Inter-Range Instrumentation Group IRIG-B standard, for future use in the Large Hadron Collider (LHC).

  5. Resultados preliminares del forraje de Morus alba en la alimentación de vacas lecheras

    Directory of Open Access Journals (Sweden)

    M. Milera

    2007-01-01

    Full Text Available El objetivo del presente trabajo consistió en evaluar el potencial del forraje de M. alba con vacas mestizas para la producción de leche. El trabajo se desarrolló en Cuba, la cual se encuentra localizada entre los 19° y 81’ de longitud oeste. La Estación Experimental de Pastos y Forrajes “Indio Hatuey” está ubicada en el municipio de Perico, provincia de Matanzas, sobre un suelo ferralítico rojo, a los 22° 40’ 7’’ de latitud norte y 81° 2’ de longitud oeste, a una altura de 10.91 msnm. La evaluación se hizo con vacas mestizas del cruce Holstein x Cebú, que tenían 54 días de lactancia. El estudio se dividió en dos periodos: en el primero (que duró 53 días se suministró el forraje de morera ad libitum, sin trocear, y se pastoreó de forma restringida en gramíneas mejoradas de secano, sin fertilización; en el segundo periodo, los animales dispusieron de pastoreo de gramíneas mejoradas con un 10% de un área establecida con Leucaena leucocephala y recibieron forraje de morera restringido hasta el 1% del peso vivo; éste tuvo una duración de 87 días. Se determinó la disponibilidad de pasto, la composición bromatológica y el consumo de forraje de Morus alba, así como la producción de leche de las vacas. El forraje de morera presentó altos va- lores de proteína y bajos contenidos de fibra; los consumos en el primer periodo llegaron hasta 2.7% del peso vivo. La producción de leche promedio fue de 10.6 kg/vaca/día durante los 140 días de evaluación y la máxima producción se registró en los primeros 53 días (1 kg/vaca/día. Los resultados demostraron la alta calidad de la morera cuando se utiliza como forraje para la alimentación de vacas mestizas. En las condiciones evaluadas, es posible obtener producciones de 10 litros por animal diariamente, cuando se utiliza el forraje de morera en adición al pasto de especies mejoradas, sin suplementación de concentrados.

  6. Deconstruyendo el resultado contable convencional para diseñar un resultado contable ambiental

    OpenAIRE

    José Juan Déniz Mayor; María Concepción Verona Martel

    2015-01-01

    En el presente trabajo se discute la dificultad de delimitar con precisión los flujos de gastos e ingresos relacionados con la gestión ambiental corporativa, utilizando como hilo argumental el diseno˜ de un modelo algebraico de resultado contable que haga visible las partidas más significativas en esta materia. Las principales conclusiones se centran en la necesidad de vincular los gastos e ingresos ambientales a objetivos específicos a fin de poder evaluar el desempeno˜ ambiental de la empre...

  7. Adopción de IFRS y gerenciamiento de resultado en las empresas brasileñas de capital abierto

    Directory of Open Access Journals (Sweden)

    Roberto Midoguti Joia

    2014-01-01

    Full Text Available El Brasil adoptó, en 2007, las normas internacionales de contabilidad - International Financial Reporting Standards(IFRS. Pesquisas realizadas con empresas de capital abierto, en varios países del mundo, indican que esa nueva norma tiende a mejorar la calidad de la información y dejarla más comparable y transparente. Frente a eso, el estudio tiene como objetivo verificar si ha habido mudanza en los niveles de gerenciamiento de resultados después de 2010 y si fue en función de la adopción completa de las IFRS por las compañías brasileñas de capital abierto (con excepción de las instituciones financieras. Los datos fueron extraídos de las demostraciones contables trimestrales de los bancos de datos del Economática y de la Comisión de Valores Mobiliarios referentes al período de 2006 a 2011. Para alcanzar el objetivo de la pesquisa, fueron efectuados dos tests. El primero mostró que los accruals discrecionales, calculados por medio del Modelo de Jones Modificado, tuvieron media menor después de 2010. A continuación, fue elaborado el análisis de regresión con datos dispuestos en panel con corrección de Newey-West. Los resultados no confirmaron la hipótesis de que la adopción de las IFRS afectó al nivel de gerenciamiento de resultados en el período analizado, pero mostraron que el tamaño y el endeudamiento explican significativamente los accruals discrecionales, independientemente de la adopción de las IFRS. Los resultados sugieren que empresas mayores y con elevada proporción de capital propio tienden a producir informes con mejor calidad, independientemente de la adopción de las IFRS.

  8. Briefing highlights space weather risks to GPS

    Science.gov (United States)

    Tretkoff, Ernie

    2011-07-01

    Solar storms, which are expected to increase as the Sun nears the most active phase of the solar cycle, can disrupt a variety of technologies on which society relies. Speakers at a 22 June briefing on Capitol Hill in Washington, D. C., focused on how space weather can affect the Global Positioning System (GPS), which is used in a wide range of industries, including commercial air travel, agriculture, national security, and emergency response. Rocky Stone, chief technical pilot for United Airlines, noted that GPS allows more aircraft to be in airspace, saves fuel, and helps aircraft move safely on runways. “Improvements in space weather forecasting need to be pursued,” he said. Precision GPS has also “changed the whole nature of farming,” said Ron Hatch, Director of Navigation Systems, NavCom Technology/John Deere. GPS makes it possible for tractors to be driven in the most efficient paths and for fertilizer and water to be applied precisely to the areas that most need them. Space weather-induced degradation of GPS signals can cause significant loss to farms that rely on GPS. Elizabeth Zimmerman, Deputy Associate Administrator for the Office of Response and Recovery at the Federal Emergency Management Agency (FEMA), described how FEMA relies on GPS for disaster recovery. The agency is developing an operations plan for dealing with space weather, she said.

  9. Robust GPS autonomous signal quality monitoring

    Science.gov (United States)

    Ndili, Awele Nnaemeka

    The Global Positioning System (GPS), introduced by the U.S. Department of Defense in 1973, provides unprecedented world-wide navigation capabilities through a constellation of 24 satellites in global orbit, each emitting a low-power radio-frequency signal for ranging. GPS receivers track these transmitted signals, computing position to within 30 meters from range measurements made to four satellites. GPS has a wide range of applications, including aircraft, marine and land vehicle navigation. Each application places demands on GPS for various levels of accuracy, integrity, system availability and continuity of service. Radio frequency interference (RFI), which results from natural sources such as TV/FM harmonics, radar or Mobile Satellite Systems (MSS), presents a challenge in the use of GPS, by posing a threat to the accuracy, integrity and availability of the GPS navigation solution. In order to use GPS for integrity-sensitive applications, it is therefore necessary to monitor the quality of the received signal, with the objective of promptly detecting the presence of RFI, and thus provide a timely warning of degradation of system accuracy. This presents a challenge, since the myriad kinds of RFI affect the GPS receiver in different ways. What is required then, is a robust method of detecting GPS accuracy degradation, which is effective regardless of the origin of the threat. This dissertation presents a new method of robust signal quality monitoring for GPS. Algorithms for receiver autonomous interference detection and integrity monitoring are demonstrated. Candidate test statistics are derived from fundamental receiver measurements of in-phase and quadrature correlation outputs, and the gain of the Active Gain Controller (AGC). Performance of selected test statistics are evaluated in the presence of RFI: broadband interference, pulsed and non-pulsed interference, coherent CW at different frequencies; and non-RFI: GPS signal fading due to physical blockage and

  10. Mining Significant Semantic Locations from GPS Data

    DEFF Research Database (Denmark)

    Cao, Xin; Cong, Gao; Jensen, Christian Søndergaard

    2010-01-01

    With the increasing deployment and use of GPS-enabled devices, massive amounts of GPS data are becoming available. We propose a general framework for the mining of semantically meaningful, significant locations, e.g., shopping malls and restaurants, from such data. We present techniques capable...... of extracting semantic locations from GPS data. We capture the relationships between locations and between locations and users with a graph. Significance is then assigned to locations using random walks over the graph that propagates significance among the locations. In doing so, mutual reinforcement between...

  11. Mining significant semantic locations from GPS data

    DEFF Research Database (Denmark)

    Cao, Xin; Cong, Gao; Jensen, Christian S.

    2010-01-01

    With the increasing deployment and use of GPS-enabled devices, massive amounts of GPS data are becoming available. We propose a general framework for the mining of semantically meaningful, significant locations, e.g., shopping malls and restaurants, from such data. We present techniques capable...... of extracting semantic locations from GPS data. We capture the relationships between locations and between locations and users with a graph. Significance is then assigned to locations using random walks over the graph that propagates significance among the locations. In doing so, mutual reinforcement between...

  12. La Asociación Latinoamericana de Sociología: una historia de sus primeros congresos

    Directory of Open Access Journals (Sweden)

    Blanco Alejandro

    2005-01-01

    Full Text Available El examen de las asociaciones nacionales y regionales de sociología de América Latina, de su estructura y composición como de sus transformaciones es, todavía hoy, una asignatura pendiente en la historia de la disciplina. Este trabajo reconstruye la historia de los primeros años de la Asociación Latinoamericana de Sociología, intentando caracterizar su contexto de emergencia, sus principales rasgos y su papel en la formación de la sociología de la región.

  13. Comprensión inferencial de textos narrativos en primeros lectores: una revisión de la literatura

    OpenAIRE

    Claudia Patricia Duque Aristizábal; Ángela Victoria Vera Márquez; Angélica Patricia Hernández Gutiérrez

    2010-01-01

    En este artículo se presenta una revisión de la literatura sobre comprensión inferencial de textos narrativos en los primeros lectores. El interés por abordar la comprensión textual en esta población se debe a los hallazgos que se han encontrado sobre el papel decisivo que tiene para la relación que mantendrá el individuo con la lectura a lo largo de su vida, la forma en que realiza sus aproximaciones iniciales a la lectura, y el hecho de que -aunque elaborar inferenci...

  14. FBBF: un reto en la integración de las materias básicas en primero de Medicina

    OpenAIRE

    Gal Iglesias, Beatriz; Fernández Santander, Ana; Palau Beato, Luisa Cristina; Sánchez, Ana María

    2012-01-01

    Un grupo de profesores del Departamento de Ciencias Biomédicas Básicas de la UEM nos planteamos la importancia de la integración en el diseño del currículo del Grado de Medicina, desde una perspectiva tanto horizontal como vertical. En este trabajo planteamos la puesta a punto de un curriculum basado en la integración de las materias, como experiencia piloto, para los alumnos de primero de medicina. A continuación se describe la reorganización de las asignaturas y créditos así como la metodol...

  15. Resultados preliminares del Sistema de Telemonitorización para Unidades de Cuidados Intensivos

    Directory of Open Access Journals (Sweden)

    María del Carmen Tellería Prieto

    2013-10-01

    Full Text Available Introducción: se exponen en el trabajo los primeros resultados obtenidos en el desarrollo del sistema de telemonitorización de pacientes críticos, ejecutado como parte de un proyecto ramal de la Dirección Nacional de Urgencias Médicas del Ministerio de Salud Pública de Cuba. El sistema se desarrolla a partir de los requerimientos de diseño definidos por el grupo de emergencistas e intensivistas de todo el país que participaron de la investigación. Objetivo: establecer una estructura única al registro de los procedimientos que se desarrollan en la atención al paciente, mejorando con ellos la recepción y el procesamiento de los datos que se registran, para la posterior emisión de resultado. Material y método: el sistema es una aplicación web con arquitectura cliente-servidor, desarrollada con el framework JBoss Seam en lenguaje Java. Se ha desarrollado de forma modular, con una interfaz para la navegación de los médicos y enfermeros muy sencilla e interactiva. Resultados: el sistema se ocupa de la gestión y el registro de las actividades clínicas y administrativas que se llevan a cabo en un servicio de hospitalización, mediante el sistema de información clínica, así como de la comunicación con los equipos médicos que monitorizan al paciente en su cabecera. Conclusiones: se facilita la captura, gestión, tratamiento y almacenamiento de la información generada para cada paciente hospitalizado, integrando toda la información que se maneja en el servicio. Se han desarrollado los módulos correspondientes al registro del recibimiento médico, la indicación médica de tratamiento y su cumplimiento por parte de enfermería, la prescripción de medicamentos al paciente, las gestiones de medicamentos en la farmacia y de las dietas con el departamento dietético, entre otros.

  16. Formación de precios en la industria manufacturera de México. Resultados de una encuesta

    Directory of Open Access Journals (Sweden)

    Vicente Castañón

    2008-01-01

    Full Text Available En este artículo se identifica los orígenes y tipos de rigideces de precios que se presentan en la industria manufacturera mexicana. Así, con esa finalidad, durante el segundo semestre de 2005 se levantó una encuesta en la que participaron 398 empresas de dicho sector. Destacan del análisis correspondiente los siguientes resultados. Primero, las empresas mantienen en promedio sus precios sin cambio durante un periodo cercano a seis meses. Segundo, la mayor parte de ellas revisa sus precios en un lapso predeterminado; sin embargo, ante el impacto de perturbaciones significativas, más de la mitad de las compañías encuestadas suele modificar esta estrategia al efectuar revisiones contingentes al comportamiento de las variables que afectan su estado de resultados. Tercero, la inflexibilidad de los precios se asocia en la mayor parte de los casos a los costos de producción y a la existencia de contratos explícitos e implícitos. Cuarto, la reacción de los precios es sensible al tipo y dirección de las perturbaciones que afectan a cada empresa.

  17. Deconstruyendo el resultado contable convencional para diseñar un resultado contable ambiental

    Directory of Open Access Journals (Sweden)

    José Juan Déniz Mayor

    2015-01-01

    Full Text Available En el presente trabajo se discute la dificultad de delimitar con precisión los flujos de gastos e ingresos relacionados con la gestión ambiental corporativa, utilizando como hilo argumental el diseno˜ de un modelo algebraico de resultado contable que haga visible las partidas más significativas en esta materia. Las principales conclusiones se centran en la necesidad de vincular los gastos e ingresos ambientales a objetivos específicos a fin de poder evaluar el desempeno˜ ambiental de la empresa y el riesgo de adoptar decisiones ambientalmente ineficientes para mejorar la imagen pública gracias a este estado contable. Entre las principales limitaciones del modelo propuesto se encuentran el problema de la vinculación homogeneizada de las magnitudes contables a los objetivos de protección ambiental y la exclusión de las externalidades ambientales.

  18. LADOTD GPS technology management plan : tech summary.

    Science.gov (United States)

    2012-02-01

    Global Positioning System (GPS) technology has been adopted by diff erent sections within the Louisiana : Department of Transportation and Development (LADOTD) over the last decade with no uniform standards : for their use, procurement, training, and...

  19. Overview of GPS Adjacent Band Compatibility Assessment

    Science.gov (United States)

    2014-09-18

    January 13, 2012 National SpaceBased Positioning, Navigation, and Timing (PNT) Executive Committee (EXCOM) cochair letter to National Telecommunications and Information Administration (NTIA) proposed to draft new Global Positioning System (GPS)...

  20. Ionospheric irregularities at Antarctic using GPS measurements

    Indian Academy of Sciences (India)

    Scintillation is a major problem in navigation application using GPS and in satellite ... ground ionization which leads to phase as well as amplitude scintillation as reported by ..... in satellite sig- nals which arise from the scattering of radio waves.

  1. Global Positioning System (GPS) Energetic Particle Data

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Energetic particle data from the CXD and BDD instrument on the GPS constellation are available to the space weather research community. The release of these data...

  2. Real-time GPS Signal Simulator

    Data.gov (United States)

    National Aeronautics and Space Administration — With a minimal FTE investment and no additional procurement funds, the development of a low fidelity orbital GPS Signal simulator would is possible.  This IRAD...

  3. GPS-deprived localisation for underground mines

    CSIR Research Space (South Africa)

    Hlophe, K

    2010-08-31

    Full Text Available robots. Opencast mines utilise the global positioning system (GPS) to obtain location information. The unavailability of this technology in underground mining has actuated numerous researchers to investigate possible alternatives. These attempts exploit...

  4. En Billig GPS Data Analyse Platform

    DEFF Research Database (Denmark)

    Andersen, Ove; Christiansen, Nick; Larsen, Niels T.

    2011-01-01

    Denne artikel præsenterer en komplet software platform til analyse af GPS data. Platformen er bygget udelukkende vha. open-source komponenter. De enkelte komponenter i platformen beskrives i detaljer. Fordele og ulemper ved at bruge open-source diskuteres herunder hvilke IT politiske tiltage, der...... organisationer med et digitalt vejkort og GPS data begynde at lave trafikanalyser på disse data. Det er et krav, at der er passende IT kompetencer tilstede i organisationen....

  5. Could intervention by clinics such as Primeros Pasos affect the prevalence of childhood malnutrition in the developing world?

    Science.gov (United States)

    Seccombe, Adam; Hughes, Elizabeth

    2009-12-01

    Guatemala is a country severely affected by malnutrition, particularly in its child population. The present study aimed to assess the impact of recognised aetiological factors on the prevalence of malnutrition and to establish the efficacy of a Guatemalan malnutrition clinic by examining the changes in the prevalence of malnutrition in the ten surrounding communities served by the clinic. Records of children (n 7681) aged 5-16 years seen by the clinic between 2004 and 2006 were examined. Anthropometric data for each child were taken from these records and used as an indicator for their nutritional status to estimate the change in rates of malnutrition during this period. An overall reduction was seen in all forms of malnutrition over the 3-year period, although over 50 % of the study population remained malnourished in 2006. A consistent reduction was also seen in rates of moderate and severe malnutrition, but not in rates of mild malnutrition. The results demonstrate that clinics such as Primeros Pasos can have a beneficial effect on schoolchildren, particularly those who are severely malnourished. A need has been highlighted for more research in this area, particularly how clinics such as Primeros Pasos can be best used in the fight against malnutrition.

  6. Assessing fitness for work: GPs judgment making.

    Science.gov (United States)

    Foley, Michelle; Thorley, Kevan; Van Hout, Marie-Claire

    2013-12-01

    The complexity of a fitness for work consultation is well documented. General practitioners (GPs) find that such consultations often create conflict and they feel ill-prepared for the task. We aimed to examine the consultation process in the fitness for work consultation and to report on the response of GPs to two hypothetical consultations of work related sickness absence, one of a psychological and one of a physical nature. Three areas of the consultation were examined; social/family circumstances, workplace history and information required assessing the severity of the condition. We used a randomized design using an online questionnaire completed by 62 GPs located in the Republic of Ireland. Analysis was conducted in NVivo 8 qualitative software using thematic and content analysis techniques. GPs may be expected to collect and consider information relating to social, domestic, financial, lifestyle and workplace factors, including workload, job satisfaction, job strain, work ethic, inter staff relationships and employee support mechanisms. The mode of presentation may trigger specific information seeking in the consultation. GPs may evaluate fitness for work in a variety of ways depending on medical and non-medical factors. Further research should further examine the factors that may influence the GPs decision to prescribe sickness leave.

  7. Geomagnetic storm effects on GPS based navigation

    Directory of Open Access Journals (Sweden)

    P. V. S. Rama Rao

    2009-05-01

    Full Text Available The energetic events on the sun, solar wind and subsequent effects on the Earth's geomagnetic field and upper atmosphere (ionosphere comprise space weather. Modern navigation systems that use radio-wave signals, reflecting from or propagating through the ionosphere as a means of determining range or distance, are vulnerable to a variety of effects that can degrade the performance of the navigational systems. In particular, the Global Positioning System (GPS that uses a constellation of earth orbiting satellites are affected due to the space weather phenomena.

    Studies made during two successive geomagnetic storms that occurred during the period from 8 to 12 November 2004, have clearly revealed the adverse affects on the GPS range delay as inferred from the Total Electron Content (TEC measurements made from a chain of seven dual frequency GPS receivers installed in the Indian sector. Significant increases in TEC at the Equatorial Ionization anomaly crest region are observed, resulting in increased range delay during the periods of the storm activity. Further, the storm time rapid changes occurring in TEC resulted in a number of phase slips in the GPS signal compared to those on quiet days. These phase slips often result in the loss of lock of the GPS receivers, similar to those that occur during strong(>10 dB L-band scintillation events, adversely affecting the GPS based navigation.

  8. El vocabulario del niño en los primeros cursos de E.G.B.

    Directory of Open Access Journals (Sweden)

    Fernando JUSTICIA JUSTICIA

    2009-11-01

    Full Text Available Este trabajo pretende dar a conocer parte de los resultados de un extenso proyecto de investigación, patrocinado por la CACYT, sobre la «Determinación y Análisis del Vocabulario del Niño de 6 a 10 años», llevado a cabo en el Departamento de Psicología de la Universidad de Granada. El vocabulario infantil ha sido tema de investigación en numerosas ocasiones. En la mayor parte de ellas subyace un doble interés: de una parte, el interés científico derivado de un mejor conocimiento de esta faceta del comportamiento verbal, de otra, un interés eminentemente práctico y pedagógico. En efecto, el lenguaje es uno de los pilares fundamentales en los que se apoya la enseñanza y el aprendizaje escolar. Por consiguiente, el conocimiento del vocabulario usual del niño nos va a permitir modificar y adaptar o adecuar los medios didácticos al comportamiento inicial que el alumno manifiesta en un área de tanta trascendencia educativa como es el área del lenguaje.

  9. Los primeros pasos de una ciencia republicana emancipatoria en la América andina

    Directory of Open Access Journals (Sweden)

    Leoncio LÓPEZ-OCÓN

    2011-07-01

    Full Text Available En este artículo se muestran, en primer lugar, las diversas acciones realizadas por los gobiernos de los países andinos en las primeras décadas de vida independiente para fomentar el cultivo de las ciencias. Entre esas acciones cabe destacar la promoción de la enseñanza técnica, la importación de científicos de Europa y el apoyo dado a los naturalistas europeos que recorrieron las nuevas naciones andinas siguiendo las huellas de Alejandro de Humboldt. Se analiza luego el debate entre los historiadores sobre si ese impulso científico inicial se debió a la iniciativa de los propios países andinos o surgió de presiones procedentes del extranjero. Se señalan finalmente algunos resultados de los programas de investigación de naturalistas y médicos en las repúblicas andinas durante el segundo tercio del siglo XIX. Se sostiene entonces que debido a esa multiplicidad de iniciativas se estableció en la América andina, y en otras partes del continente americano, un vínculo duradero y decisivo entre ciencia y política, entre saber y poder.

  10. Primeros pasos en la posturografía dinámica computarizada

    Directory of Open Access Journals (Sweden)

    Cristina CORDERO-CIVANTOS

    2018-01-01

    Full Text Available Introducción y objetivo: La posturografía dinámica computarizada (CDP es una técnica que nos va a permitir cuantificar de forma objetiva, como las diferentes patologías afectan la estabilidad postural de los pacientes y su evolución. Metodología: revisión narrativa. Resultados: En este trabajo vamos a repasar como se realizan y analizan las diferentes pruebas de la CDP; y su utilidad diagnóstica y terapéutica en la práctica otorrinolaringológica. Discusión y conclusiones: La posturografía dinámica computarizada es una prueba diagnóstico-terapéutica que permite cuantificar de forma objetiva y reproducible la estabilidad del paciente. Y aporta información relevante para planificar el tratamiento rehabilitador, así como para monitorizar su evolución.

  11. Combined GPS/GLONASS Precise Point Positioning with Fixed GPS Ambiguities

    Science.gov (United States)

    Pan, Lin; Cai, Changsheng; Santerre, Rock; Zhu, Jianjun

    2014-01-01

    Precise point positioning (PPP) technology is mostly implemented with an ambiguity-float solution. Its performance may be further improved by performing ambiguity-fixed resolution. Currently, the PPP integer ambiguity resolutions (IARs) are mainly based on GPS-only measurements. The integration of GPS and GLONASS can speed up the convergence and increase the accuracy of float ambiguity estimates, which contributes to enhancing the success rate and reliability of fixing ambiguities. This paper presents an approach of combined GPS/GLONASS PPP with fixed GPS ambiguities (GGPPP-FGA) in which GPS ambiguities are fixed into integers, while all GLONASS ambiguities are kept as float values. An improved minimum constellation method (MCM) is proposed to enhance the efficiency of GPS ambiguity fixing. Datasets from 20 globally distributed stations on two consecutive days are employed to investigate the performance of the GGPPP-FGA, including the positioning accuracy, convergence time and the time to first fix (TTFF). All datasets are processed for a time span of three hours in three scenarios, i.e., the GPS ambiguity-float solution, the GPS ambiguity-fixed resolution and the GGPPP-FGA resolution. The results indicate that the performance of the GPS ambiguity-fixed resolutions is significantly better than that of the GPS ambiguity-float solutions. In addition, the GGPPP-FGA improves the positioning accuracy by 38%, 25% and 44% and reduces the convergence time by 36%, 36% and 29% in the east, north and up coordinate components over the GPS-only ambiguity-fixed resolutions, respectively. Moreover, the TTFF is reduced by 27% after adding GLONASS observations. Wilcoxon rank sum tests and chi-square two-sample tests are made to examine the significance of the improvement on the positioning accuracy, convergence time and TTFF. PMID:25237901

  12. Combined GPS/GLONASS Precise Point Positioning with Fixed GPS Ambiguities

    Directory of Open Access Journals (Sweden)

    Lin Pan

    2014-09-01

    Full Text Available Precise point positioning (PPP technology is mostly implemented with an ambiguity-float solution. Its performance may be further improved by performing ambiguity-fixed resolution. Currently, the PPP integer ambiguity resolutions (IARs are mainly based on GPS-only measurements. The integration of GPS and GLONASS can speed up the convergence and increase the accuracy of float ambiguity estimates, which contributes to enhancing the success rate and reliability of fixing ambiguities. This paper presents an approach of combined GPS/GLONASS PPP with fixed GPS ambiguities (GGPPP-FGA in which GPS ambiguities are fixed into integers, while all GLONASS ambiguities are kept as float values. An improved minimum constellation method (MCM is proposed to enhance the efficiency of GPS ambiguity fixing. Datasets from 20 globally distributed stations on two consecutive days are employed to investigate the performance of the GGPPP-FGA, including the positioning accuracy, convergence time and the time to first fix (TTFF. All datasets are processed for a time span of three hours in three scenarios, i.e., the GPS ambiguity-float solution, the GPS ambiguity-fixed resolution and the GGPPP-FGA resolution. The results indicate that the performance of the GPS ambiguity-fixed resolutions is significantly better than that of the GPS ambiguity-float solutions. In addition, the GGPPP-FGA improves the positioning accuracy by 38%, 25% and 44% and reduces the convergence time by 36%, 36% and 29% in the east, north and up coordinate components over the GPS-only ambiguity-fixed resolutions, respectively. Moreover, the TTFF is reduced by 27% after adding GLONASS observations. Wilcoxon rank sum tests and chi-square two-sample tests are made to examine the significance of the improvement on the positioning accuracy, convergence time and TTFF.

  13. PRIMEROS RESULTADOS SOBRE EL USO PREHISPÁNICO DE LOS VEGETALES EN EL SITIO ARQUEOLÓGICO LOS TRES CERROS 1 (VICTORIA, ENTRE RÍOS, ARGENTINA: ANÁLISIS DEL REGISTRO BIOSILÍCEO.

    Directory of Open Access Journals (Sweden)

    Jorge O. Sánchez

    2013-01-01

    Full Text Available El registro de microfósiles biosilíceos posee un alto grado de preservación en distintos contextos naturales y culturales. Por esta razón, el estudio de los fitolitos y otros microrrestos biosilíceos puede contribuir a determinar las condiciones ambientales de las comunidades vegetales que rodearon un sitio arqueológico, así como también identificar especies vegetales domesticadas. En esta contribución se rea- lizó el análisis de fitolitos en el marco de otros bioindicadores de los depósitos superiores de la secuencia sedimentaria antrópica del sitio Los Tres Cerros 1 (LTC1, isla Las Moras, Departamento Victoria, Entre Ríos, Argentina. Los análisis desarrollados permitieron identificar morfotipos silíceos relacionados con la presencia de vegetales silvestres que caracterizan a la unidad fitogeográfica actual del área de em- plazamiento, y morfotipos silíceos asignables a recursos vegetales de interés cultural, pertenecientes a las familias Arecaceae, Cucurbitaceae, y Poaceae (subfamilias Maideae y Oryzoideae. El registro de microfósiles biosilíceos del perfil del sitio LTC1 tiene un cambio neto que puede ser correlacionado con diferentes actividades culturales desempeñadas durante el proceso de construcción del montículo, que tuvo lugar durante ca.1000 - 500 años 14C AP.

  14. First results of dose to patient in CT extracted with an automatic registration system; Primeros resultados de dosis a paciente en TC extraidas con un sistema automatico de registro

    Energy Technology Data Exchange (ETDEWEB)

    Minambres Moro, A.; Fernandez Leton, P.; Garcia Ruiz-Zorilla, J.; Perez Moreno, J. M.; Zucca Aparicio, D.

    2013-07-01

    Radiation protection of the patient in computed tomography (CT) is a priority for several reasons: the dose received during a scan is relatively high, is the diagnostic mode with greater contribution to dose to patient collective and the frequency of completion of TC is increasing rapidly the past few years. On the other hand, are currently beginning to commercially offer automated registration of dose to patient receiving dosimetric parameters of all scans performed on the equipment connected to the system. In this communication the first results are presented from two TC connected to an automatic system of this kind recently installed at our Center. (Author)

  15. Investigaciones sobre la fauna de las aguas subterráneas de España: Lista de estaciones y primeros resultados. Research on the groundwater fauna of Spain: List of stations and first results

    NARCIS (Netherlands)

    Notenboom, Jos; Meijers, Ine

    1985-01-01

    Durante el período agosto 1983 – septiembre 1984 se ha realizado una investigación de la fauna de varios tipos de aguas subterráneas en algunas regiones de Espana. Se ha hecho este trabajo para conocer, principalmente, la repartición geográfica de los crustáceos subterráneos, con acento en los

  16. ERRAPRI Project: estimation of radiation risk to patients in interventional radiology, initial results and proposed levels of complexity; Proyecto ERRAPRI: estimacion del riesgo radiologico a los pacientes en radiologia intervencionista. Primeros resultados y propuestas de indices de complejidad

    Energy Technology Data Exchange (ETDEWEB)

    Ruiz Cruces, R.; Vano, E.; Hernandez-Armas, J.; Carrera, F.; Diaz, F.; Gallego Beuther, J. F.; Ruiz Munoz-Canela, J. P.; Sanchez Casanueva, R.; Perez Martinez, M.; Fernandez Soto, J. M.; Munoz, V.; Moreno, F.; Moreno, C.; Martin-Palanca, A.

    2011-07-01

    The project ERRAPRI (2009 - 2012) will assess the most relevant aspects of the radiological risk associated with interventional radiology techniques (IR) guided by fluoroscopy in a sample of Spanish hospitals of three autonomous regions. Specific objectives include: assessing procedural protocols, especially the parameters related to radiation dose and diagnostic information obtained to establish balances cost (radiation risk) benefit to the procedures evaluated, and propose an index of complex procedures on several levels, based on the difficulty of making the same, assessing its relationship with the radiation dose values.

  17. General description and first results with the ORIS-LMRI 4 {pi} {gamma} metering chamber; Descripcion general y primeros resultados con la camara 4 {pi} {gamma} metrologica ORIS-LMRI

    Energy Technology Data Exchange (ETDEWEB)

    Tejera R, A; Becerril V, A; Cortes P, A

    1990-04-15

    A problem that present the ionization chambers is that the response for the radiation is global, that is to say that it cannot discriminate against selectively the relating responses at different energies, if these impact simultaneously in the active volume. This is a reason to calibrate the chambers, if is possible, with gamma monoenergetic emitting and by average calculations to complete the response curve with gamma emitting of well-known yields. To obtain the calibration coefficients and may used them, it is necessary that so much the standardized radioisotopes as the solutions by calibrating, are contained in vessels with the same geometry and the same quantity. In the exposed case, pattern solutions of 5 ml were used contained in glass cruets of 10 ml. The problem solutions are contained in same cruets to those of the patterns. The first results obtained with the ORIS-LMRI 4 {pi} {gamma} metering chamber are presented. (Author)

  18. The International GPS Service (IGS) as a Continuous Reference System for Precise GPS Positioning

    Science.gov (United States)

    Neilan, Ruth; Heflin, Michael; Watkins, Michael; Zumberge, James

    1996-01-01

    The International GPS Service for Geodynamics (IGS) is an organization which operates under the auspices of the International Association of Geodesy (IAG) and has been operational since January 1994. The primary objective of the IGS is to provide precise GPS data and data products to support geodetic and geophysical research activities.

  19. GPS Space Service Volume: Ensuring Consistent Utility Across GPS Design Builds for Space Users

    Science.gov (United States)

    Bauer, Frank H.; Parker, Joel Jefferson Konkl; Valdez, Jennifer Ellen

    2015-01-01

    GPS availability and signal strength originally specified for users on or near surface of Earth with transmitted power levels specified at edge-of-Earth, 14.3 degrees. Prior to the SSV specification, on-orbit performance of GPS varied from block build to block build (IIA, IIRM, IIF) due to antenna gain and beam width variances. Unstable on-orbit performance results in significant risk to space users. Side-lobe signals, although not specified, were expected to significantly boost GPS signal availability for users above the constellation. During GPS III Phase A, NASA noted significant discrepancies in power levels specified in GPS III specification documents, and measured on-orbit performance. To stabilize the signal for high altitude space users, NASA DoD team in 2003-2005 led the creation of new Space Service Volume (SSV) definition and specifications.

  20. GPS Tomography: Water Vapour Monitoring for Germany

    Science.gov (United States)

    Bender, Michael; Dick, Galina; Wickert, Jens; Raabe, Armin

    2010-05-01

    Ground based GPS atmosphere sounding provides numerous atmospheric quantities with a high temporal resolution for all weather conditions. The spatial resolution of the GPS observations is mainly given by the number of GNSS satellites and GPS ground stations. The latter could considerably be increased in the last few years leading to more reliable and better resolved GPS products. New techniques such as the GPS water vapour tomography gain increased significance as data from large and dense GPS networks become available. The GPS tomography has the potential to provide spatially resolved fields of different quantities operationally, i. e. the humidity or wet refractivity as required for meteorological applications or the refraction index which is important for several space based observations or for precise positioning. The number of German GPS stations operationally processed by the GFZ in Potsdam was recently enlarged to more than 300. About 28000 IWV observations and more than 1.4 millions of slant total delay data are now available per day with a temporal resolution of 15 min and 2.5 min, respectively. The extended network leads not only to a higher spatial resolution of the tomographically reconstructed 3D fields but also to a much higher stability of the inversion process and with that to an increased quality of the results. Under these improved conditions the GPS tomography can operate continuously over several days or weeks without applying too tight constraints. Time series of tomographically reconstructed humidity fields will be shown and different initialisation strategies will be discussed: Initialisation with a simple exponential profile, with a 3D humidity field extrapolated from synoptic observations and with the result of the preceeding reconstruction. The results are compared to tomographic reconstructions initialised with COSMO-DE analyses and to the corresponding model fields. The inversion can be further stabilised by making use of independent

  1. Development of automatic techniques for GPS data management

    International Nuclear Information System (INIS)

    Park, Pil Ho

    2001-06-01

    It is necessary for GPS center to establish automatization as effective management of GPS network including data gathering, data transformation, data backup, data sending to IGS (International GPS Service for geodynamics), and precise ephemerides gathering. The operating program of GPS center has been adopted at KCSC (Korea Cadastral Survey Corporation), NGI (National Geography Institute), MOMAF (Ministry of Maritime Affairs and Fisheries) without self-development of core technique. The automatic management of GPS network is consists of GPS data management and data processing. It is also fundamental technique, which should be accomplished by every GPS centers. Therefore, this study carried out analyzing of Japanese GPS center, which has accomplished automatization by module considering applicability for domestic GPS centers

  2. Physical applications of GPS geodesy: a review.

    Science.gov (United States)

    Bock, Yehuda; Melgar, Diego

    2016-10-01

    Geodesy, the oldest science, has become an important discipline in the geosciences, in large part by enhancing Global Positioning System (GPS) capabilities over the last 35 years well beyond the satellite constellation's original design. The ability of GPS geodesy to estimate 3D positions with millimeter-level precision with respect to a global terrestrial reference frame has contributed to significant advances in geophysics, seismology, atmospheric science, hydrology, and natural hazard science. Monitoring the changes in the positions or trajectories of GPS instruments on the Earth's land and water surfaces, in the atmosphere, or in space, is important for both theory and applications, from an improved understanding of tectonic and magmatic processes to developing systems for mitigating the impact of natural hazards on society and the environment. Besides accurate positioning, all disturbances in the propagation of the transmitted GPS radio signals from satellite to receiver are mined for information, from troposphere and ionosphere delays for weather, climate, and natural hazard applications, to disturbances in the signals due to multipath reflections from the solid ground, water, and ice for environmental applications. We review the relevant concepts of geodetic theory, data analysis, and physical modeling for a myriad of processes at multiple spatial and temporal scales, and discuss the extensive global infrastructure that has been built to support GPS geodesy consisting of thousands of continuously operating stations. We also discuss the integration of heterogeneous and complementary data sets from geodesy, seismology, and geology, focusing on crustal deformation applications and early warning systems for natural hazards.

  3. UNA MAQUINARIA DE DOMINACIÓN MUNDIAL: EL CATOLICISMO ARGENTINO SEGÚN LOS PRIMEROS MISIONEROS MENONITAS

    Directory of Open Access Journals (Sweden)

    Agustina Altman

    2013-12-01

    Full Text Available El presente trabajo tiene por objetivo abordar la mirada sobre el catolicismo que construyeron los primeros menonitas establecidos en Argentina, entre su llegada al país en 1917 y el comienzo del Concilio Vaticano II en 1962. Para ello, utilizaremos los escritos personales de diversos miembros de la Iglesia Menonita, incluyendo sus análisis de notas periodísticas, y las publicaciones menonitas en Argentina. Las divergencias en puntos centrales como la separación entre la iglesia, el Estado y la política partidaria, y una concepción no jerárquica de la comunidad de fieles, serán temas recurrentes en la disputa por una posición dentro de un campo religioso en plena conformación.

  4. La representación del tiempo histórico en los libros de texto de primero y segundo de la enseñanza secundaria obligatoria

    OpenAIRE

    Blanco Rebollo, Ángel

    2008-01-01

    El artículo es un resumen de la tesis doctoral realizada por Ángel Blanco y dirigida por Joaquim Prats, titulada «La representación del tiempo histórico en los libros de texto de primero y segundo de la enseñanza secundaria obligatoria». El objetivo principal de la investigación ha sido la observación de las formas y los mecanismos de transmisión utilizados por los manuales para representar del tiempo histórico. Para ello, se han seleccionado ocho libros de ciencias sociales de primero y segu...

  5. Single-Receiver GPS Phase Bias Resolution

    Science.gov (United States)

    Bertiger, William I.; Haines, Bruce J.; Weiss, Jan P.; Harvey, Nathaniel E.

    2010-01-01

    Existing software has been modified to yield the benefits of integer fixed double-differenced GPS-phased ambiguities when processing data from a single GPS receiver with no access to any other GPS receiver data. When the double-differenced combination of phase biases can be fixed reliably, a significant improvement in solution accuracy is obtained. This innovation uses a large global set of GPS receivers (40 to 80 receivers) to solve for the GPS satellite orbits and clocks (along with any other parameters). In this process, integer ambiguities are fixed and information on the ambiguity constraints is saved. For each GPS transmitter/receiver pair, the process saves the arc start and stop times, the wide-lane average value for the arc, the standard deviation of the wide lane, and the dual-frequency phase bias after bias fixing for the arc. The second step of the process uses the orbit and clock information, the bias information from the global solution, and only data from the single receiver to resolve double-differenced phase combinations. It is called "resolved" instead of "fixed" because constraints are introduced into the problem with a finite data weight to better account for possible errors. A receiver in orbit has much shorter continuous passes of data than a receiver fixed to the Earth. The method has parameters to account for this. In particular, differences in drifting wide-lane values must be handled differently. The first step of the process is automated, using two JPL software sets, Longarc and Gipsy-Oasis. The resulting orbit/clock and bias information files are posted on anonymous ftp for use by any licensed Gipsy-Oasis user. The second step is implemented in the Gipsy-Oasis executable, gd2p.pl, which automates the entire process, including fetching the information from anonymous ftp

  6. Combining GPS measurements and IRI model predictions

    International Nuclear Information System (INIS)

    Hernandez-Pajares, M.; Juan, J.M.; Sanz, J.; Bilitza, D.

    2002-01-01

    The free electrons distributed in the ionosphere (between one hundred and thousands of km in height) produce a frequency-dependent effect on Global Positioning System (GPS) signals: a delay in the pseudo-orange and an advance in the carrier phase. These effects are proportional to the columnar electron density between the satellite and receiver, i.e. the integrated electron density along the ray path. Global ionospheric TEC (total electron content) maps can be obtained with GPS data from a network of ground IGS (international GPS service) reference stations with an accuracy of few TEC units. The comparison with the TOPEX TEC, mainly measured over the oceans far from the IGS stations, shows a mean bias and standard deviation of about 2 and 5 TECUs respectively. The discrepancies between the STEC predictions and the observed values show an RMS typically below 5 TECUs (which also includes the alignment code noise). he existence of a growing database 2-hourly global TEC maps and with resolution of 5x2.5 degrees in longitude and latitude can be used to improve the IRI prediction capability of the TEC. When the IRI predictions and the GPS estimations are compared for a three month period around the Solar Maximum, they are in good agreement for middle latitudes. An over-determination of IRI TEC has been found at the extreme latitudes, the IRI predictions being, typically two times higher than the GPS estimations. Finally, local fits of the IRI model can be done by tuning the SSN from STEC GPS observations

  7. A Bridge Deflection Monitoring with GPS

    Science.gov (United States)

    Figurski, M.; Gałuszkiewicz, M.; Wrona, M.

    2007-01-01

    This paper introduces results of investigation carried on by The Applied Geomatics Section in Military University of Technology. Research includes possibilities of monitoring dynamic behavior of a bridge using high rate GPS data. Whole event was executed with collaboration of The Road and Bridge Management and The Warsaw Geodesy Company. Interdisciplinary approach with this project allows authors to get reliable information about investigating constructions and their respond for true traffic loading detected by GPS receivers. Way of compute data and used software (TRACK) are also shown in this paper.

  8. GPS synchronized power system phase angle measurements

    Science.gov (United States)

    Wilson, Robert E.; Sterlina, Patrick S.

    1994-09-01

    This paper discusses the use of Global Positioning System (GPS) synchronized equipment for the measurement and analysis of key power system quantities. Two GPS synchronized phasor measurement units (PMU) were installed before testing. It was indicated that PMUs recorded the dynamic response of the power system phase angles when the northern California power grid was excited by the artificial short circuits. Power system planning engineers perform detailed computer generated simulations of the dynamic response of the power system to naturally occurring short circuits. The computer simulations use models of transmission lines, transformers, circuit breakers, and other high voltage components. This work will compare computer simulations of the same event with field measurement.

  9. Effect of GPS errors on Emission model

    DEFF Research Database (Denmark)

    Lehmann, Anders; Gross, Allan

    n this paper we will show how Global Positioning Services (GPS) data obtained from smartphones can be used to model air quality in urban settings. The paper examines the uncertainty of smartphone location utilising GPS, and ties this location uncertainty to air quality models. The results presented...... in this paper indicates that the location error from using smartphones is within the accuracy needed to use the location data in air quality modelling. The nature of smartphone location data enables more accurate and near real time air quality modelling and monitoring. The location data is harvested from user...

  10. AVALIAÇÃO DO DESEMPENHO DOS SISTEMAS GPS E GLONASS NO POSICIONAMENTO POR PONTO PRECISO, COMBINADOS E INDIVIDUALMENTE.

    Directory of Open Access Journals (Sweden)

    Bruno Guimarães Ventorim

    Full Text Available Este trabalho visa avaliar o desempenho dos sistemas GLONASS (Global'naya Navigatsionnay Sputnikovaya Sistema, GPS (Global Positioning System e o uso combinado de ambos sistemas em diferentes latitudes, utilizando o serviço de Posicionamento por Ponto Preciso CSRS-PPP. Para isso foram selecionadas 16 estações da rede IGS (International GNSS Service, das quais foram utilizados os dados GNSS no formato RINEX do mês de agosto de 2014 e editados no TEQC (Translation, Editing, and Quality Check, obtendo arquivos com intervalos de 30 e 45 minutos, contendo apenas dados GPS, dados GLONASS e dados dos dois sistemas. As coordenadas estimadas no CSRS-PPP foram comparadas com as coordenadas de referência obtidas no sítio do ITRF (International Terrestrial Reference Frame, possibilitando o cálculo da acurácia do PPP com uso de dados GPS e GLONASS, separadamente e em conjunto. Após o cálculo das acurácias para cada dia de agosto, outliers foram detectados e eliminados utilizando o método boxplot com o uso do programa R. Verificou-se que o uso combinado do GPS e GLONASS, para todos as estações, proporcionou resultados mais acurados. Além disso, pode-se destacar a potencialidade do GLONASS, que apresentou desempenho superior ao do GPS na maioria das estações.

  11. Aplicación académica de mensajes de texto en un curso de primeros auxilios: estudio piloto en una universidad privada de Lima, Perú

    Directory of Open Access Journals (Sweden)

    Rodrigo M Carrillo-Larco

    Full Text Available El objetivo del estudio fue desarrollar y evaluar el impacto de una intervención educativa con el uso de mensajes de texto (SMS en un curso de primeros auxilios. Se realizó un estudio prospectivo y de intervención. Se implementaron dos etapas: 1 estudio cualitativo para diseñar los SMS, 2 intervención con el envío de los SMS. La variable resultado fue la nota final de los alumnos. Se construyeron modelos multivariados y se calculó razones de prevalencia e intervalos de confianza al 95%. La primera fase reveló que los SMS debían ser educativos-teóricos, motivacionales, y tipo test. En la intervención hubo 66 participantes en el grupo control e intervención. La edad promedio fue 17,7 (±1,2 años. El grupo intervención obtuvo calificación mayor en comparación con el grupo control (RP=4,82; IC 95%: 1,58-14,72. En conclusión, los SMS con contenido informativo y motivacional son útiles en la formación del pregrado en Medicina

  12. USGS Earthquake Program GPS Use Case : Earthquake Early Warning

    Science.gov (United States)

    2015-03-12

    USGS GPS receiver use case. Item 1 - High Precision User (federal agency with Stafford Act hazard alert responsibilities for earthquakes, volcanoes and landslides nationwide). Item 2 - Description of Associated GPS Application(s): The USGS Eart...

  13. GPS Attitude Determination for Launch Vehicles, Phase I

    Data.gov (United States)

    National Aeronautics and Space Administration — Toyon Research Corporation proposes to develop a family of compact, low-cost GPS-based attitude (GPS/A) sensors for launch vehicles. In order to obtain 3-D attitude...

  14. IceBridge GPS L0 Raw Satellite Navigation Data

    Data.gov (United States)

    National Aeronautics and Space Administration — The NASA IceBridge GPS L0 Raw Satellite Navigation Data (IPUTG0) data set contains GPS readings, including latitude, longitude, track, ground speed, off distance,...

  15. Derivation of some geometric parameters from GPS measurements

    Directory of Open Access Journals (Sweden)

    Marcel Mojzeš

    2005-11-01

    Full Text Available Combining GPS and terrestrial data requires a common coordinate system. When the original GPS vectors do not form a network, the 3D network adjustment can not be performed. In this case, in order to integrate the GPS measurements with the terrestrial observations and to perform a combined network adjustment, the GPS measurements should be transformed to this common system. The GPS measurements which are the usual output of the GPS post processing softwares are based on the WGS84 ellipsoid and the S-JTSK local datum is based on the Bessel ellipsoid. Thus, the reduction of measurements to the S-JTSK mapping plane can not be started from the measurements resulting from GPS post processing softwares because GPS and S-JTSK don’t have the same ellipsoid. Another view of this reduction will be described in this paper.

  16. Using GPS for studying pastoral mobility

    DEFF Research Database (Denmark)

    Adriansen, Hanne Kirstine

    2017-01-01

    geographer familiar with satellite remote sensing and GIS, I pondered how these relatively new technologies could be combined with classic ethnographic fieldwork, which we also use in human geography. I decided to use handheld GPS devices for tracking the pastoralists and their herds. My study was, as far...... the interviewee’s point of view....

  17. The covariance of GPS coordinates and frames

    International Nuclear Information System (INIS)

    Lachieze-Rey, Marc

    2006-01-01

    We explore, in the general relativistic context, the properties of the recently introduced global positioning system (GPS) coordinates, as well as those of the associated frames and coframes that they define. We show that they are covariant and completely independent of any observer. We show that standard spectroscopic and astrometric observations allow any observer to measure (i) the values of the GPS coordinates at his position (ii) the components of his 4-velocity and (iii) the components of the metric in the GPS frame. This provides this system with a unique value both for conceptual discussion (no frame dependence) and for practical use (involved quantities are directly measurable): localization, motion monitoring, astrometry, cosmography and tests of gravitation theories. We show explicitly, in the general relativistic context, how an observer may estimate his position and motion, and reconstruct the components of the metric. This arises from two main results: the extension of the velocity fields of the probes to the whole (curved) spacetime, and the identification of the components of the observer's velocity in the GPS frame with the (inversed) observed redshifts of the probes. Specific cases (non-relativistic velocities, Minkowski and Friedmann-Lemaitre spacetimes, geodesic motions) are studied in detail

  18. Characterizing urban structure using taxi GPS data

    NARCIS (Netherlands)

    Zheng, Zhong; Zhou, Suhong; Rasouli, S.; Timmermans, H.J.P.

    2014-01-01

    Scholars have explored urban structure from many perspectives. Developments in ICT have made it possible to discover spatial patterns in activities using big data. The identified patterns allow us to better understand urban structure. This chapter reports the collection of taxi GPS records for a

  19. Integrating GPS with Dead Reckoning Sensors

    DEFF Research Database (Denmark)

    Cederholm, Jens Peter

    2000-01-01

    A vehicle positioning system comprising a GPS receiver, a digital compass, and an odometer was tested on a 2.8-km stretch in Aalborg, Denmark. The system, which merges observations from the three instruments using a Kalman filter, has an update rate of 1 Hz and is intended for use in both urban a...

  20. Fundamentals of GPS Receivers A Hardware Approach

    CERN Document Server

    Doberstein, Dan

    2012-01-01

    While much of the current literature on GPS receivers is aimed at those intimately familiar with their workings, this volume summarizes the basic principles using as little mathematics as possible, and details the necessary specifications and circuits for constructing a GPS receiver that is accurate to within 300 meters. Dedicated sections deal with the features of the GPS signal and its data stream, the details of the receiver (using a hybrid design as exemplar), and more advanced receivers and topics including time and frequency measurements. Later segments discuss the Zarlink GPS receiver chip set, as well as providing a thorough examination of the TurboRogue receiver, one of the most accurate yet made. Guiding the reader through the concepts and circuitry, from the antenna to the solution of user position, the book’s deployment of a hybrid receiver as a basis for discussion allows for extrapolation of the core ideas to more complex, and more accurate designs. Digital methods are used, but any analogue c...

  1. Exploring female GPs' perceptions about medical leadership.

    Science.gov (United States)

    Price, Karen; Clearihan, Lynette

    2015-06-01

    Women are increasingly entering the Australian general practice workforce. This study aims to explore female general practitioners' (GPs') perceptions of possible barriers to leadership and professional roles in the workforce. A purposive, convenience sample of 30 female GPs in active practice was approached in February, 2012. An anonymous, pa-per-based, semi-quantitative survey sought to identify participation and leadership confidence within general practice in a number of professional roles. The top two barriers participants identified for after-hours medical meetings were energy to attend and geographical location. For after-hours care, the top two barriers identified were energy and self-motivation. Few participants aspired to 'leadership' activities. 'Medical mentoring' was most likely to attract them into leadership. It is important female GPs' perspectives are explored in general practice. This small survey suggests further studies are needed in the importance of energy limitations and lack of self-confidence in restricting female GPs' capacity to fully engage in professional roles.

  2. TLALOCNet continuous GPS-Met Array in Mexico supporting the 2017 NAM GPS Hydrometeorological Network.

    Science.gov (United States)

    Cabral-Cano, E.; Salazar-Tlaczani, L.; Adams, D. K.; Vivoni, E. R.; Grutter, M.; Serra, Y. L.; DeMets, C.; Galetzka, J.; Feaux, K.; Mattioli, G. S.; Miller, M. M.

    2017-12-01

    TLALOCNet is a network of continuous GPS and meteorology stations in Mexico to study atmospheric and solid earth processes. This recently completed network spans most of Mexico with a strong coverage emphasis on southern and western Mexico. This network, funded by NSF, CONACyT and UNAM, recently built 40 cGPS-Met sites to EarthScope Plate Boundary Observatory standards and upgraded 25 additional GPS stations. TLALOCNet provides open and freely available raw GPS data, and high frequency surface meteorology measurements, and time series of daily positions. This is accomplished through the development of the TLALOCNet data center (http://tlalocnet.udg.mx) that serves as a collection and distribution point. This data center is based on UNAVCO's Dataworks-GSAC software and also works as part of UNAVCO's seamless archive for discovery, sharing, and access to GPS data. The TLALOCNet data center also contains contributed data from several regional GPS networks in Mexico for a total of 100+ stations. By using the same protocols and structure as the UNAVCO and other COCONet regional data centers, the scientific community has the capability of accessing data from the largest Mexican GPS network. This archive provides a fully queryable and scriptable GPS and Meteorological data retrieval point. In addition, real-time 1Hz streams from selected TLALOCNet stations are available in BINEX, RTCM 2.3 and RTCM 3.1 formats via the Networked Transport of RTCM via Internet Protocol (NTRIP) for real-time seismic and weather forecasting applications. TLALOCNet served as a GPS-Met backbone for the binational Mexico-US North American Monsoon GPS Hydrometeorological Network 2017 campaign experiment. This innovative experiment attempts to address water vapor source regions and land-surface water vapor flux contributions to precipitation (i.e., moisture recycling) during the 2017 North American Monsoon in Baja California, Sonora, Chihuahua, and Arizona. Models suggest that moisture recycling is

  3. How does the workload and work activities of procedural GPs compare to non-procedural GPs?

    Science.gov (United States)

    Russell, Deborah J; McGrail, Matthew R

    2017-08-01

    To investigate patterns of Australian GP procedural activity and associations with: geographical remoteness and population size hours worked in hospitals and in total; and availability for on-call DESIGN AND PARTICIPANTS: National annual panel survey (Medicine in Australia: Balancing Employment and Life) of Australian GPs, 2011-2013. Self-reported geographical work location, hours worked in different settings, and on-call availability per usual week, were analysed against GP procedural activity in anaesthetics, obstetrics, surgery or emergency medicine. Analysis of 9301 survey responses from 4638 individual GPs revealed significantly increased odds of GP procedural activity in anaesthetics, obstetrics or emergency medicine as geographical remoteness increased and community population size decreased, albeit with plateauing of the effect-size from medium-sized (population 5000-15 000) rural communities. After adjusting for confounders, procedural GPs work more hospital and more total hours each week than non-procedural GPs. In 2011 this equated to GPs practising anaesthetics, obstetrics, surgery, and emergency medicine providing 8% (95%CI 0, 16), 13% (95%CI 8, 19), 8% (95%CI 2, 15) and 18% (95%CI 13, 23) more total hours each week, respectively. The extra hours are attributable to longer hours worked in hospital settings, with no reduction in private consultation hours. Procedural GPs also carry a significantly higher burden of on-call. The longer working hours and higher on-call demands experienced by rural and remote procedural GPs demand improved solutions, such as changes to service delivery models, so that long-term procedural GP careers are increasingly attractive to current and aspiring rural GPs. © 2016 National Rural Health Alliance Inc.

  4. 77 FR 70421 - GPS Satellite Simulator Control Working Group Meeting

    Science.gov (United States)

    2012-11-26

    ... DEPARTMENT OF DEFENSE Department of the Air Force GPS Satellite Simulator Control Working Group Meeting AGENCY: Space and Missile Systems Center, Global Positioning Systems (GPS) Directorate, Department of the Air Force, DoD. ACTION: Meeting Notice. SUMMARY: This meeting notice is to inform GPS...

  5. 78 FR 63459 - GPS Satellite Simulator Control Working Group Meeting

    Science.gov (United States)

    2013-10-24

    ... DEPARTMENT OF DEFENSE Air Force GPS Satellite Simulator Control Working Group Meeting AGENCY: Department of the Air Force. ACTION: Meeting Notice. SUMMARY: This meeting notice is to inform GPS simulator manufacturers, who supply products to the Department of Defense (DoD), and GPS simulator users, both government...

  6. The Evolution of Global Positioning System (GPS) Technology.

    Science.gov (United States)

    Kumar, Sameer; Moore, Kevin B.

    2002-01-01

    Describes technological advances in the Global Positioning System (GPS), which is also known as the NAVSTAR GPS satellite constellation program developed in 1937, and changes in the nature of our world by GPS in the areas of agriculture, health, military, transportation, environment, wildlife biology, surveying and mapping, space applications, and…

  7. Transportation mode recognition using GPS and accelerometer data

    NARCIS (Netherlands)

    Feng, T.; Timmermans, H.J.P.

    2013-01-01

    Potential advantages of global positioning systems (GPS) in collecting travel behavior data have been discussed in several publications and evidenced in many recent studies. Most applications depend on GPS information only. However, transportation mode detection that relies only on GPS information

  8. Sensing and Classifying Impairments of GPS Reception on Mobile Devices

    DEFF Research Database (Denmark)

    Blunck, Henrik; Kjærgaard, Mikkel Baun; Toftegaard, Thomas Skjødeberg

    2011-01-01

    Positioning using GPS receivers is a primary sensing modality in many areas of pervasive computing. However, previous work has not considered how people’s body impacts the availability and accuracy of GPS positioning and for means to sense such impacts. We present results that the GPS performance...

  9. Tipos de resultados en evaluación económica de las intervenciones farmacéuticas

    Directory of Open Access Journals (Sweden)

    Sanz Granda A.

    2012-06-01

    Full Text Available Cualquier intervención farmacéutica debe presentar como objetivo principal mejorar los resultados de salud. Asimismo, es preciso tener en consideración que un resultado, que es la consecuencia obtenida a partir de la utilización de los distintos recursos, es un beneficio por el que se aumenta el bienestar individual o social. En función del tipo de beneficio obtenido, los resultados se clasifican en dos clases principales: los sanitarios y los no sanitarios. Muy probablemente, el farmacéutico comunitario está más habituado a manejarse con los primeros, puesto que se asocian con las variables habituales, como los mmHg para medir la presión arterial o los mg/dL para hacerlo con la glucemia en plasma o bien mediante el número de exacerbaciones que se producen en una EPOC o el porcentaje de casos resueltos con curación clínica y bacteriológica en una neumonía adquirida en la comunidad. Los resultados anteriores forman parte de los denominados intermedios, pero también el farmacéutico ha manejado variables finales, como es la supervivencia cuando se halla frente a un paciente que ha sufrido un infarto agudo de miocardio y expresa la efectividad de una determinada tecnología sanitaria mediante la probabilidad de supervivencia al cabo de treinta días. No obstante, es probable que el farmacéutico esté menos habituado a manejarse con otros resultados cuyo tipo no sea el sanitario clásico y que están relacionados con la calidad de vida relacionada con la salud (CVRS. Ya es clásica la definición de la OMS que aumenta la extensión de salud al indicar que no sólo es la ausencia de la enfermedad. La CVRS integra en una dimensión dual, tanto la duración de la vida como la percepción por el paciente de su calidad de vida. De ello surge el concepto de año de vida ajustado a calidad (AVAC que refleja más fielmente el estado de salud del individuo. De modo que las intervenciones farmacéuticas, que deben mejorar los resultados de

  10. La aplicación del GPS a la arqueología

    Directory of Open Access Journals (Sweden)

    Amado Reino, Xesús

    1997-06-01

    Full Text Available The adoption of GPS technology in Archaeology is relatively recent and its use is increasing more and more. The excellent results obtained from the mapping of archaeological elements has led many archaeologists to acquire GPS systems, professional in some cases and pocket in other. This paper tries to introduce this technology, showing its possibilities and more frequent uses in archaeology. This contribution also tries to give a critical vision in the application of the different kind of receivers and the ways of professional use.

    La incorporación de la tecnología GPS a la arqueología es relativamente reciente y su uso cada vez mayor. Los excelentes resultados obtenidos en la georreferenciación de elementos arqueológicos han movido a muchos profesionales a la adquisición de equipos, unas veces profesionales y otras de bolsillo. Este trabajo pretende servir de presentación de esta tecnología exponiendo sus posibilidades y usos más frecuentes en arqueología, además de hacer una serie de puntualizaciones en cuanto a la fiabilidad, precisión de los diferentes tipos de receptores portátiles y formas de aplicación con carácter profesional de estos equipos.

  11. EL APRENDIZAJE DE LA LECTURA Y ESCRITURA EN LOS PRIMEROS AÑOS DE ESCOLARIDAD: EXPERIENCIAS EXITOSAS DE GUATEMALA

    Directory of Open Access Journals (Sweden)

    Marta Zoila Caballeros Ruiz

    2014-01-01

    Full Text Available El artículo presenta un estado del arte de la lectura y escritura en los primeros años de escolaridad. Se analizan diversas teorías del aprendizaje y los nuevos aportes de la neurociencia. Asimismo, se resume una sistematización de proyectos ejecutados en Guatemala entre los años 2000 y 2011 con énfasis en las lecciones aprendidas durante su ejecución. Se trata de seis proyectos que cumplen con los criterios: a el período de ejecución total entre 2000 y 2011; b contar con documentación para sistematizarlo y c estar relacionado directamente con la enseñanza de la lectura y escritura en el país. El análisis de dichas experiencias y las lecciones aprendidas muestra que la tendencia de los proyectos en esta área se orienta a la capacitación docente en metodología innovadora y producción de material educativo, sin embargo la diversidad lingüística y la educación bilingüe intercultural siguen siendo un tema prioritario que requie re atención.

  12. El problema sanitario de España: saneamiento y medio rural en los primeros decenios del siglo XX

    Directory of Open Access Journals (Sweden)

    Galiana, Mª Eugenia

    2006-12-01

    Full Text Available During the early decades of the 20th century, the Spanish socio-sanitary situation was described as catastrophic, both in the urban as well as in the rural setting. In that context, sanitation emerged as one of the key elements of the regeneration process taken on by hygiene in its role as mediator. Through the works of hygienists G. de Membrillera and Luis Muñoz Antuñano, published in 1921, we have approached the analysis of the sanitary situation of rural Spain during this period.

    En los primeros decenios del siglo XX, la situación socio-sanitaria de la sociedad española fue descrita como catastrófica, tanto en el ámbito urbano como en el rural. En aquel contexto, el saneamiento del medio aparece como una de las claves del proceso de regeneración que asumió la higiene en su papel de mediadora. A través de las obras de los higienistas G. De Membrillera y Luis Muñoz Antuñano, publicadas en 1921, nos hemos acercado al análisis de la situación sanitaria de la España rural durante este periodo.

  13. Resistencia del Plasmodium Falciparum a la combinación de los tres primeros casos en Colombia

    Directory of Open Access Journals (Sweden)

    C. A. Espinal

    1981-12-01

    Full Text Available La combinación sulfadoxina-pirimetamina ha sido uno de los esquemas de tratamiento más utilizados en las infecciones por P. falciparum resistente a la cloroquina. En este artículo describimos los primeros tres casos documentados de resistencia a esta combinación de medicamentos en Colombia. en pacientes procedentes d e San José del Guaviare y el Valle del Ariari, donde también se ha encontrado el P. falciparum resistente a la cloroquina. El empleo de las tetraciclinas, a una dosis de Igr/día por 8 a 12 días, asociadas a un esquizonticida de acción rápida como la quinina o la amodiaquina. es el tratamiento más adecuado para los casos que presentan resistencia múltiple a las drogas antimaláricas. La cloroquina únicamente debe ser utilizada cuando la infección puede ser controlada por este medicamento en su fase aguda y el paciente tenga un bajo recuento de parásitos por microlitro de sangre.

  14. El primero de mayo en la ciudad de México en los tiempos de la revolución.

    Directory of Open Access Journals (Sweden)

    Anna Ribera Carb\\u00F3

    2006-01-01

    Full Text Available De entre las tradiciones inventadas por los trabajadores del mundo, la más exitosa es, sin duda, la del Primero de Mayo que sirvió para cohesionar a grupos obreros de distinta denominación ideológica y a crear entre ellos conciencia de clase como ninguna otra. En México la conmemoración empezó a realizarse de manera tardía. Fue en 1913 cuando se organizó en la ciudad de México la primera manifestación masiva a partir de la iniciativa de la Casa del Obrero Mundial fundada un año antes y vinculada al pensamiento anarcosindicalista. Fue justamente con esta manifestación que la clase obrera empezó a construir su propio espacio en la capital del país y convirtió a la Casa del Obrero Mundial en un elemento fundamental del entramado político de la Revolución Mexicana.

  15. Los primeros ensayos de Ángel Rama: inicios montevideanos de una crítica latinoamericana

    Directory of Open Access Journals (Sweden)

    Facundo Gomez

    2017-07-01

    Full Text Available Los estudios generales sobre el discurso crítico latinoamericano de la segunda mitad del siglo XX colocan al uruguayo Ángel Rama en un lugar central de su construcción y organización. A pesar de los numerosos enfoques ensayados acerca de su obra, repetidas veces su figura es concebida en términos cerrados que lo afilian a la sociología de la cultura, el compromiso político o la militancia latinoamericanista. El análisis de sus primeros artículos, publicados entre 1948 y 1955 en las revistas Clinamen, Marcha, Asir y Entregas de La Licorne, demuestra cómo su praxis crítica se entrecruza inicialmente con elementos propios del campo intelectual uruguayo de mitad de siglo y de qué manera el joven Rama empieza su exploración de la literatura a partir de posiciones, teorías y metodologías muy disímiles a las observadas en sus trabajos clásicos de las décadas posteriores.

  16. Tendinopatia patelar: resultados tardios do tratamento cirúrgico

    Directory of Open Access Journals (Sweden)

    Marcos Henrique Frauendorf Cenni

    2015-10-01

    Full Text Available resumo Objetivo: Avaliar os resultados tardios do tratamento cirúrgico na tendinopatia patelar (TP com o uso do escore Visa (Victorian Institute of Sport Tendon Study Group e o método de Verheyden. Métodos: Estudo retrospectivo que avaliou os resultados pós-operatórios de 12 pacientes, ou 14 joelhos, entre julho de 2002 e fevereiro de 2011. Foram incluídos os pacientes com tendinopatia patelar refratários ao tratamento conservador e que não apresentavam outras lesões cirúrgicas concomitantes. Pacientes que não foram devidamente acompanhados no período pós-operatório foram excluídos. Resultados: Pelo método de Verheyden, nove pacientes foram considerados muito bons, dois bons e um ruim. Em relação ao Visa, a média foi de 92,4 pontos, com apenas dois pacientes abaixo de 70 pontos (66 e 55 pontos. Conclusão: O tratamento cirúrgico da tendinopatia patelar, quando corretamente indicado, tem bons resultados em longo prazo.

  17. Resultados de la fase de engorde en invernaderos

    OpenAIRE

    Sonnenholzner, Stanislaus

    2002-01-01

    Resultados de la fase de engorde en invernaderos Continuando con la serie de experimentos que se están desarrollando en la estación experimental Pesglasa para evaluar el efecto del tratamiento térmico en la supervivencia del camarón, se realizó la fase de engorde en invernaderos.

  18. Cuestionario de rasgos de personalidad obsesiva (CRPO): resultados preliminares

    OpenAIRE

    Vallejo Ruiloba, Julio; Marcos, Teodor; Salamero, Manel

    1996-01-01

    Se presentan los resultados preliminares del cuestionario de rasgos de personalidad obsesiva (CRPO) en tres muestras de población (pacientes obsesivos, pacientes depresivos con melancolía y controles sanos). cuestionario, de 31 ítems, ha demostrado ser útil y válido para discriminar el trastorno obsesivo-compulsivo personalidad.

  19. Dinámica de objetos transplutonianos: resultados preliminares

    Science.gov (United States)

    Fernández, S.; Brizuela, H.; Roig, F.; Varela, O.

    Se presentan los resultados de una integración numérica de las ecuaciones de movimiento para objetos transplutonianos. Se han calculado los tiempos de Lyapunov para esos objetos y se analiza el comportamiento dinámico de los mismos.

  20. PRINCIPALES CENTROS DE ATENCIÓN DEL PROFESORADO DE EDUCACIÓN FÍSICA EN LOS PRIMEROS AÑOS DE PROFESIÓN DOCENTE

    Directory of Open Access Journals (Sweden)

    J. Viciana

    2010-09-01

    Full Text Available

    RESUMEN

    El contenido del presente artículo resume desde dos perspectivas, una cuantitativa y otra cualitativa, los focos de atención del profesorado de Educación Física (EF, en los primeros años de su profesión docente o formación permanente. La perspectiva cuantitativa, analiza las diferencias significativas (Statistica 4.0 entre las creencias de un grupo de profesores estudiados durante un proceso formativo, centrándonos en aquellas dimensiones que obtuvieron dichas diferencias y por tanto, son motivo de alta preocupación por el profesorado. La perspectiva cualitativa, analiza el discurso de los profesores estudiados en 18 sesiones de formación, a través del programa Analysis Qualitative Data 3.0, destacando las categorías temáticas más frecuentes y por tanto de más aparición y preocupación por el profesorado estudiado durante sus sesiones de formación. Igualmente se presentan mapas ilustrativos, con ejemplos de texto de estas categorías temáticas para observar las diferentes direcciones que toman los intereses de los profesores. Los resultados muestran que desde ambas perspectivas, se observa una dirección común de los centros de atención hacia el aprendizaje de los alumnos.
    PALABRAS CLAVE: Centros de atención, conocimiento práctico en EF, formación permanente

     

    ABSTRACT

    The content of the present article summarizes from two perspective, quantitative and a other qualitative one, the centers of attention of the Physical Education’s teachers (PE, in the first years of its educational profession. The quantitative perspective, analyzes the significant differences (Statistica 4,0 between the beliefs of a group of professors studied during a formative process, centering to us in those dimensions that obtained these differences and therefore, are reason for

  1. GPS-derived crustal deformation in Azerbaijan

    Science.gov (United States)

    Safarov, Rafig; Mammadov, Samir; Kadirov, Fakhraddin

    2017-04-01

    Crustal deformations of the Earth's crust in Azerbaijan were studied based on GPS measurements. The GPS velocity vectors for Azerbaijan, Iran, Georgia, and Armenia were used in order to estimate the deformation rates. It is found that compression is observable along the Greater Caucasus, in Gobustan, the Kura depression, Nakhchyvan Autonomous Republic, and adjacent areas of Iran. The axes of compression/contraction of the crust in the Greater Caucasus region are oriented in the S-NE direction. The maximum strain rate is observed in the zone of mud volcanism at the SHIK site (Shykhlar), which is marked by a sharp change in the direction of the compression axes (SW-NE). It is revealed that the deformation field also includes the zones where strain rates are very low. These zones include the Caspian-Guba and northern Gobustan areas, characterized by extensive development of mud volcanism. The extension zones are confined to the Lesser Caucasus and are revealed in the Gyadabei (GEDA) and Shusha (SHOU) areas. The analysis of GPS data for the territory of Azerbaijan and neighboring countries reveals the heterogeneous patterns of strain field in the region. This fact suggests that the block model is most adequate for describing the structure of the studied region. The increase in the number of GPS stations would promote increasing the degree of detail in the reconstructions of the deformation field and identifying the microplate boundaries.It is concluded that the predominant factor responsible for the eruption of mud volcanoes is the intensity of gasgeneration processes in the earth's interior, while deformation processes play the role of a trigger. The zone of the epicenters of strong earthquakes is correlated to the gradient zone in the crustal strain rates.

  2. Global Geodesy Using GPS Without Fiducial Sites

    Science.gov (United States)

    Heflin, Michael B.; Blewitt, Geoffrey

    1994-01-01

    Global Positioning System, GPS, used to make global geodetic measurements without use of fiducial site coordinates. Baseline lengths and geocentric radii for each site determined without having to fix any site coordinates. Given n globally distributed sites, n baseline lengths and n geocentric radii form polyhedron with each site at vertex and with geocenter at intersection of all radii. Geodetic information derived from structure of polyhedron and its change with time. Approach applied to any global geodetic technique.

  3. Saved by Iridium? An Alternative to GPS

    Science.gov (United States)

    2012-05-17

    know this. The enemy presents itself at any time, at any place, in many shapes and forms, often for no apparent reason. As Ecclesiastes 9:18 states...These physical architectures correspond to ground operations in scenarios ranging from complete air superiority to completely denied airspace.”86 A...not interfere with today’s GPS architectures .88 The second developed alternative from Dr. Asher’s group is the Rapidly Deployable Satellite

  4. Absolute GPS Positioning Using Genetic Algorithms

    Science.gov (United States)

    Ramillien, G.

    A new inverse approach for restoring the absolute coordinates of a ground -based station from three or four observed GPS pseudo-ranges is proposed. This stochastic method is based on simulations of natural evolution named genetic algorithms (GA). These iterative procedures provide fairly good and robust estimates of the absolute positions in the Earth's geocentric reference system. For comparison/validation, GA results are compared to the ones obtained using the classical linearized least-square scheme for the determination of the XYZ location proposed by Bancroft (1985) which is strongly limited by the number of available observations (i.e. here, the number of input pseudo-ranges must be four). The r.m.s. accuracy of the non -linear cost function reached by this latter method is typically ~10-4 m2 corresponding to ~300-500-m accuracies for each geocentric coordinate. However, GA can provide more acceptable solutions (r.m.s. errors < 10-5 m2), even when only three instantaneous pseudo-ranges are used, such as a lost of lock during a GPS survey. Tuned GA parameters used in different simulations are N=1000 starting individuals, as well as Pc=60-70% and Pm=30-40% for the crossover probability and mutation rate, respectively. Statistical tests on the ability of GA to recover acceptable coordinates in presence of important levels of noise are made simulating nearly 3000 random samples of erroneous pseudo-ranges. Here, two main sources of measurement errors are considered in the inversion: (1) typical satellite-clock errors and/or 300-metre variance atmospheric delays, and (2) Geometrical Dilution of Precision (GDOP) due to the particular GPS satellite configuration at the time of acquisition. Extracting valuable information and even from low-quality starting range observations, GA offer an interesting alternative for high -precision GPS positioning.

  5. Arctic tides from GPS on sea ice

    DEFF Research Database (Denmark)

    Kildegaard Rose, Stine; Skourup, Henriette; Forsberg, René

    The presence of sea-ice in the Arctic Ocean plays a significant role in the Arctic climate. Sea ice dampens the ocean tide amplitude with the result that global tidal models which use only astronomical data perform less accurately in the polar regions. This study presents a kinematic processing o......-gauges and altimetry data. Furthermore, we prove that the geodetic reference ellipsoid WGS84, can be interpolated to the tidal defined zero level by applying geophysical corrections to the GPS data....

  6. Using GPS to Detect Imminent Tsunamis

    Science.gov (United States)

    Song, Y. Tony

    2009-01-01

    A promising method of detecting imminent tsunamis and estimating their destructive potential involves the use of Global Positioning System (GPS) data in addition to seismic data. Application of the method is expected to increase the reliability of global tsunami-warning systems, making it possible to save lives while reducing the incidence of false alarms. Tsunamis kill people every year. The 2004 Indian Ocean tsunami killed about 230,000 people. The magnitude of an earthquake is not always a reliable indication of the destructive potential of a tsunami. The 2004 Indian Ocean quake generated a huge tsunami, while the 2005 Nias (Indonesia) quake did not, even though both were initially estimated to be of the similar magnitude. Between 2005 and 2007, five false tsunami alarms were issued worldwide. Such alarms result in negative societal and economic effects. GPS stations can detect ground motions of earthquakes in real time, as frequently as every few seconds. In the present method, the epicenter of an earthquake is located by use of data from seismometers, then data from coastal GPS stations near the epicenter are used to infer sea-floor displacements that precede a tsunami. The displacement data are used in conjunction with local topographical data and an advanced theory to quantify the destructive potential of a tsunami on a new tsunami scale, based on the GPS-derived tsunami energy, much like the Richter Scale used for earthquakes. An important element of the derivation of the advanced theory was recognition that horizontal sea-floor motions contribute much more to generation of tsunamis than previously believed. The method produces a reliable estimate of the destructive potential of a tsunami within minutes typically, well before the tsunami reaches coastal areas. The viability of the method was demonstrated in computational tests in which the method yielded accurate representations of three historical tsunamis for which well-documented ground

  7. Escritura adolescente: una revisión basada en resultados de investigación recientes

    OpenAIRE

    Jorge Orlando Amaya Pisco

    2011-01-01

    Este trabajo tiene como objetivo revisar críticamente algunas investigaciones recientes acerca de la escritura en los jóvenes. Consta de tres apartados: en el primero se señalan las investigaciones asociadas a la escritura de estudiantes universitarios de los primeros niveles. En el segundo, se refieren los informes investigativos que centran su reflexión en la escritura de estudiantes de instituciones de secundaria y el tercero hace referencia al panorama investigativo de la escritura extrae...

  8. Azimuth selection for sea level measurements using geodetic GPS receivers

    Science.gov (United States)

    Wang, Xiaolei; Zhang, Qin; Zhang, Shuangcheng

    2018-03-01

    Based on analysis of Global Positioning System (GPS) multipath signals recorded by a geodetic GPS receiver, GPS Reflectometry (GPS-R) has demonstrated unique advantages in relation to sea level monitoring. Founded on multipath reflectometry theory, sea level changes can be measured by GPS-R through spectral analysis of recorded signal-to-noise ratio data. However, prior to estimating multipath parameters, it is necessary to define azimuth and elevation angle mask to ensure the reflecting zones are on water. Here, a method is presented to address azimuth selection, a topic currently under active development in the field of GPS-R. Data from three test sites: the Kachemak Bay GPS site PBAY in Alaska (USA), Friday Harbor GPS site SC02 in the San Juan Islands (USA), and Brest Harbor GPS site BRST in Brest (France) are analyzed. These sites are located in different multipath environments, from a rural coastal area to a busy harbor, and they experience different tidal ranges. Estimates by the GPS tide gauges at azimuths selected by the presented method are compared with measurements from physical tide gauges and acceptable correspondence found for all three sites.

  9. Repercusión del implante coclear en el aprendizaje de la lectura de los alumnos sordos: resultados preliminares

    Directory of Open Access Journals (Sweden)

    Ana Belén DOMÍNGUEZ GUTIÉRREZ

    2009-05-01

    Full Text Available RESUMEN: El propósito de este trabajo es mostrar unos primeros resultados que permitan comprobar la repercusión que están teniendo los implantes cocleares (ayudas técnicas que transforman las señales acústicas en señales eléctricas que estimulan el nervio auditivo en el aprendizaje de la lectura de los alumnos sordos. Para ello, se analizan los mecanismos de lectura desarrollados por dos grupos de alumnos sordos, con y sin implante coclear, a lo largo de la escolaridad obligatoria; tomando como referencia un grupo de alumnos oyentes de la misma edad. Los resultados muestran que existen diferencias en los mecanismos de lectura en función del uso de los implantes cocleares. Los alumnos sordos con implante coclear usan mecanismos semánticos y sintácticos en la lectura de oraciones y emplean códigos ortográficos y fonológicos; mientras que los alumnos sordos sin implante coclear usan preferentemente mecanismos semánticos y códigos ortográficos en lectura. En consecuencia, se analizan las implicaciones de estos resultados para la práctica educativa.ABSTRACT: The first aim of the present paper is to show a preliminary findings about the repercussion of cochlear implant in reading acquisition in deaf children. For this, reading strategies were analyzed in two groups of deaf children, with and without cochlear implants, during compulsory schooling. Their performance was compared with that hearing children of the same chronological age. The findings suggest that there are differences in reading strategies in funtion of the use of cochlear implants. The children who had received a cochlear implantation can use semantic and sintactic strategies in reading sentences, and they can use orthografical and phonological codes; whereas deaf children without cochlear implant use more semantic strategies in reading sentences and orthografical codes. Implications of these results for educational practice are being discussed.

  10. GPS Water Vapor Tomography Based on Accurate Estimations of the GPS Tropospheric Parameters

    Science.gov (United States)

    Champollion, C.; Masson, F.; Bock, O.; Bouin, M.; Walpersdorf, A.; Doerflinger, E.; van Baelen, J.; Brenot, H.

    2003-12-01

    The Global Positioning System (GPS) is now a common technique for the retrieval of zenithal integrated water vapor (IWV). Further applications in meteorology need also slant integrated water vapor (SIWV) which allow to precisely define the high variability of tropospheric water vapor at different temporal and spatial scales. Only precise estimations of IWV and horizontal gradients allow the estimation of accurate SIWV. We present studies developed to improve the estimation of tropospheric water vapor from GPS data. Results are obtained from several field experiments (MAP, ESCOMPTE, OHM-CV, IHOP, .). First IWV are estimated using different GPS processing strategies and results are compared to radiosondes. The role of the reference frame and the a priori constraints on the coordinates of the fiducial and local stations is generally underestimated. It seems to be of first order in the estimation of the IWV. Second we validate the estimated horizontal gradients comparing zenith delay gradients and single site gradients. IWV, gradients and post-fit residuals are used to construct slant integrated water delays. Validation of the SIWV is under progress comparing GPS SIWV, Lidar measurements and high resolution meteorological models (Meso-NH). A careful analysis of the post-fit residuals is needed to separate tropospheric signal from multipaths. The slant tropospheric delays are used to study the 3D heterogeneity of the troposphere. We develop a tomographic software to model the three-dimensional distribution of the tropospheric water vapor from GPS data. The software is applied to the ESCOMPTE field experiment, a dense network of 17 dual frequency GPS receivers operated in southern France. Three inversions have been successfully compared to three successive radiosonde launches. Good resolution is obtained up to heights of 3000 m.

  11. Resultados operativos de la Policía Nacional, 2012

    Directory of Open Access Journals (Sweden)

    Yeizon Andrés Duarte Velásquez

    2013-12-01

    Full Text Available El artículo contiene los resultados estadísticos de los logros operativos y de los servicios de la Policía Nacional en el año 2012, que sin dudas han posibilitado prevenir, disuadir, controlar e investigar conductas desviadas, como hechos delictivos y contravenciones, que han permitido lograr el mantenimiento de la convivencia y seguridad ciudadana a través de procedimientos y operaciones policiales en Colombia.

  12. Participação nos Lucros ou Resultados

    Directory of Open Access Journals (Sweden)

    Luiz Felipe Ferreira

    2007-03-01

    Full Text Available A participação nos lucros ou resultados é uma forma de remuneração variável, pela qual não há incidência de encargos sociais, além de incentivar o aumento da produtividade, podendo assim ser utilizada pelas empresas como estratégia, para enfrentarem os desafios dinâmicos e competitivos em que atuam. Esta pesquisa caracteriza-se como sendo exploratória, com abordagem qualitativa e tem como objetivo conceituar e explanar as formas pela quais são praticadas a participação nos lucros ou resultados em empresas do setor alimentício em Santa Catarina, que foram escolhidas por meio do critério de acessibilidade e disponibilidade. Dos dados coletados, pode-se verificar que as empresas: COC Alimentos, Moinho Catarinense e Pepsico do Brasil utilizam a participação nos resultados e a Perdigão utiliza a participação mista. A Moinho Catarinense distribui para todos os empregados um salário nominal, como a CDC Alimentos, exceto para os gerentes. A Perdigão beneficia todos os empregados, sendo que 60% da distribuição é pelo lucro líquido e 40% por indicadores de desempenho. A Pepsico do Brasil distribui aos empregados operacionais 50% de um salário nominal e para os empregados da administração central um salário nominal, atrelado ao cumprimento de metas, especificadas no programa de participação nos lucros ou resultados.

  13. Resultados operativos de la Policía Nacional, 2013

    Directory of Open Access Journals (Sweden)

    Jorge Nilson Harvey Barco Pérez

    2014-05-01

    Full Text Available Se realiza una breve reseña introductoria a las tablas estadísticas que presentan los resultados operativos alcanzados por la Policía Nacional para el 2013, en el desarrollo de estrategias ajustadas a políticas gubernamentales e institucionales, que permitan un despliegue efectivo de acciones preventivas, disuasivas y de control orientadas a garantizar la seguridad y la convivencia de todos los colombianos.

  14. Programa 'nieves y glaciares tropicales' (NGT: resultados (1991-1996 obtenidos en Bolivia

    Directory of Open Access Journals (Sweden)

    1998-01-01

    Full Text Available PROGRAMME “NEIGES ET GLACIERS TROPICAUX” (NGT: RÉSULTATS (1991-1996 OBTENUS EN BOLIVIE. Depuis 1991, avec ses partenaires la COBEE, l’IHH et le SENAMHI, l’ORSTOM a progressivement équipé 2 glaciers de la Cordillère Royale de Bolivie, les glaciers de Chacaltaya et Zongo. Cet équipement a permis de réaliser les bilans glaciologiques des 2 glaciers et les bilans hydrologique et énergétique du glacier Zongo. Les principaux résultats, glaciologique, hydrologique et énergétique, sont fournis dans cette communication. Un premier modèle physique du fonctionnement du glacier Zongo a été réalisé, avec des premiers résultats qui permettent d’entreprendre un modèle plus élaboré susceptible d’être généralisé à d’autres glaciers. Des carottages de neige et glace à haute altitude ont confirmé la possibilité d’exploiter ces véritables archives climatologiques. Desde 1991, con sus contrapartes COBEE, IHH y SENAMHI, el ORSTOM ha equipado progresivamente 2 glaciares de la Cordillera Real de Bolivia, los glaciares de Chacaltaya y Zongo. Este equipo ha permitido realizar los balances glaciológicos de los 2 glaciares y los balances hidrológico y energético del glaciar Zongo. Los principales resultados, glaciológicos, hidrológicos y energéticos, son proporcionados en esta comunicación. Se realizó un primer modelo físico del funcionamiento del glaciar Zongo, con primeros resultados que permiten comenzar un modelo más elaborado capaz de ser generalizado a otros glaciares. Extracciones de testigos de nieve y hielo a gran altura confirmaron la posibilidad de aprovechar estos verdaderos archivos climatológicos. PROGRAM “SNOWS AND GLACIERS IN THE TROPICS” (NGT: PRINCIPAL RESULTS IN BOLIVIA (1991-1996. Since 1991, two glaciers of the Royal Cordillera of Bolivia, the glaciers of Chacaltaya and Zongo, have been equipped by ORSTOM with his partners COBEE, IHH and SENAMHI. That equipment allowed to carry out the glaciological

  15. GPS Modeling and Analysis. Summary of Research: GPS Satellite Axial Ratio Predictions

    Science.gov (United States)

    Axelrad, Penina; Reeh, Lisa

    2002-01-01

    This report outlines the algorithms developed at the Colorado Center for Astrodynamics Research to model yaw and predict the axial ratio as measured from a ground station. The algorithms are implemented in a collection of Matlab functions and scripts that read certain user input, such as ground station coordinates, the UTC time, and the desired GPS (Global Positioning System) satellites, and compute the above-mentioned parameters. The position information for the GPS satellites is obtained from Yuma almanac files corresponding to the prescribed date. The results are displayed graphically through time histories and azimuth-elevation plots.

  16. Precise Orbit Determination of GPS Satellites Using Phase Observables

    Directory of Open Access Journals (Sweden)

    Myung-Kook Jee

    1997-12-01

    Full Text Available The accuracy of user position by GPS is heavily dependent upon the accuracy of satellite position which is usually transmitted to GPS users in radio signals. The real-time satellite position information directly obtained from broadcast ephimerides has the accuracy of 3 x 10 meters which is very unsatisfactory to measure 100km baseline to the accuracy of less than a few mili-meters. There are globally at present seven orbit analysis centers capable of generating precise GPS ephimerides and their orbit quality is of the order of about 10cm. Therefore, precise orbit model and phase processing technique were reviewed and consequently precise GPS ephimerides were produced after processing the phase observables of 28 global GPS stations for 1 day. Initial 6 orbit parameters and 2 solar radiation coefficients were estimated using batch least square algorithm and the final results were compared with the orbit of IGS, the International GPS Service for Geodynamics.

  17. Continuing medical education and burnout among Danish GPs

    DEFF Research Database (Denmark)

    Brøndt, Anders; Sokolowski, Ineta; Olesen, Frede

    2008-01-01

    BACKGROUND: There has been minimal research into continuing medical education (CME) and its association with burnout among GPs. AIM: The aim of this study was to investigate the association between participating in CME and experiencing burnout in a sample of Danish GPs. DESIGN OF STUDY: Cross......-sectional questionnaire study. SETTING: All 458 active GPs in 2004, in the County of Aarhus, Denmark were invited to participate. METHOD: Data on CME activities were obtained for all GPs and linked to burnout which was measured using the Maslach Burnout Inventory - Human Services Survey. The relationship between CME...... activity and burnout was calculated as prevalence ratios (PR) in a generalised linear model. RESULTS: In total, 379 (83.5%) GPs returned the questionnaire. The prevalence of burnout was about 25%, and almost 3% suffered from 'high burnout'. A total of 344 (92.0%) GPs were members of a CME group...

  18. GPS operations at Olkiluoto, Kivetty and Romuvaara in 2010

    International Nuclear Information System (INIS)

    Kallio, U.; Nyberg, S.; Koivula, H.; Jokela, J.; Poutanen, M.

    2011-11-01

    The Finnish Geodetic Institute (FGI) has studied crustal deformations in co-operation with the Posiva Oy since 1994, when a network of ten pillars for GPS observations was established at Olkiluoto. In 2010 the local GPS network at Olkiluoto consisted of 14 concrete pillars. The whole network has been measured twice a year in the static GPS campaigns with 24 h sessions. The four new pillars were established in 2010 and the permanent measurements on them will start in 2011. The network of seven GPS pillars was built at Kivetty and Romuvaara during the year 1996. One pillar in each investigation area belongs to the Finnish permanent GPS network, FinnRef. A total of 28 GPS measurement campaigns have been carried out at Olkiluoto since 1995, and 18 campaigns at Kivetty and Romuvaara. At Olkiluoto a baseline for electronic distance measurements (EDM) was built in 2002. The baseline has been measured in connection to the GPS observations using the EDM instrument Kern ME5000 Mekometer. The GPS operations in 2010 included the two GPS campaigns at Olkiluoto, GPS campaigns at Kivetty and Romuvaara, EDM baseline measurements at Olkiluoto, and the control marker measurements with the tachymeter at Olkiluoto. All GPS data history was reprocessed with Bernese GPS software using the new processing strategy tested in 2009. The results were analysed by computing the change rates of the baselines and estimating horizontal velocities for the pillars using the barycenter of the velocities as a reference. In the Olkiluoto inner network 80 percent of the change rates were smaller than 0.10 mm/a. Roughly one fourth of the change rates could be considered as statistically significant (change rate larger than 3 σ. The statistically significant change rates were mainly related to the Olkiluoto permanent station (GPS1) and to the pillar GPS5, which had also the maximum change rate (0.21 ± 0.03 mm/a). In Olkiluoto outer network the maximum and statistically significant change rates are

  19. Penerapan Teknologi GPS Tracker Untuk Identifikasi Kondisi Traffik Jalan Raya

    Directory of Open Access Journals (Sweden)

    IM. O. Widyantara

    2015-06-01

    Full Text Available Real time tracking system technology has been made possible by integrating three technologies, namely global positioning system (GPS, database technologies such as geographic information system (GIS and mobile telecommunications technologies such as general packet radio service (GPRS. This paper has proposed a vehicle tracking mechanism based on GPS tracker to build a real-time traffic information system. A GPS server is built to process data of position and speed of the vehicle for further processed into vehicle traffic information. The Server and GPS tracker is designed to communicate using GPRS services in real time. Furthermore, the server processes the data from the GPS tracker into traffic information such as traffic jam, dense, medium and smoothly. Test results showed that the GPS server is able to visualize the real position of the vehicle and is able to decide the category of traffic information in real time.

  20. GPS operations at Olkiluoto, Kivetty and Romuvaara in 2010

    Energy Technology Data Exchange (ETDEWEB)

    Kallio, U.; Nyberg, S.; Koivula, H.; Jokela, J.; Poutanen, M. [Finnish Geodetic Institute, Masala (Finland)

    2011-11-15

    The Finnish Geodetic Institute (FGI) has studied crustal deformations in co-operation with the Posiva Oy since 1994, when a network of ten pillars for GPS observations was established at Olkiluoto. In 2010 the local GPS network at Olkiluoto consisted of 14 concrete pillars. The whole network has been measured twice a year in the static GPS campaigns with 24 h sessions. The four new pillars were established in 2010 and the permanent measurements on them will start in 2011. The network of seven GPS pillars was built at Kivetty and Romuvaara during the year 1996. One pillar in each investigation area belongs to the Finnish permanent GPS network, FinnRef. A total of 28 GPS measurement campaigns have been carried out at Olkiluoto since 1995, and 18 campaigns at Kivetty and Romuvaara. At Olkiluoto a baseline for electronic distance measurements (EDM) was built in 2002. The baseline has been measured in connection to the GPS observations using the EDM instrument Kern ME5000 Mekometer. The GPS operations in 2010 included the two GPS campaigns at Olkiluoto, GPS campaigns at Kivetty and Romuvaara, EDM baseline measurements at Olkiluoto, and the control marker measurements with the tachymeter at Olkiluoto. All GPS data history was reprocessed with Bernese GPS software using the new processing strategy tested in 2009. The results were analysed by computing the change rates of the baselines and estimating horizontal velocities for the pillars using the barycenter of the velocities as a reference. In the Olkiluoto inner network 80 percent of the change rates were smaller than 0.10 mm/a. Roughly one fourth of the change rates could be considered as statistically significant (change rate larger than 3 {sigma}. The statistically significant change rates were mainly related to the Olkiluoto permanent station (GPS1) and to the pillar GPS5, which had also the maximum change rate (0.21 {+-} 0.03 mm/a). In Olkiluoto outer network the maximum and statistically significant change rates

  1. GeoTravel: Harvesting Ambient Geographic Footprints from GPS Trajectories

    OpenAIRE

    Liew, Li Ching; Goh, Ong Sing

    2014-01-01

    This study is about harvesting point of interest from GPS trajectories. Trajectories are the paths that moving objects move by follow through space in a function of time while GPS trajectories generally are point-sequences with geographic coordinates, time stamp, speed and heading. User can get information from GPS enable device. For example, user can acquire present location, search the information around them and design driving routes to a destination and thus design travel itineraries. By ...

  2. Briefing Highlights Vulnerability of GPS to Adverse Space Weather

    Science.gov (United States)

    Balcerak, Ernie

    2011-08-01

    Through its effects on GPS and other technologies, space weather can affect a variety of industries, including agriculture, commercial air travel, and emergency response. Speakers focused on these topics at a 22 June briefing on Capitol Hill in Washington, D. C. Solar flares can produce radio bursts that directly interfere with GPS signals. Solar activity can also cause ionospheric disturbances that produce distortions and delays in GPS signals, degrading the accuracy of positioning and navigation systems.

  3. Greenland ice mass balance from GPS, GRACE and ICESat

    DEFF Research Database (Denmark)

    Khan, Shfaqat Abbas; Kjær, Kurt H.; Korsgaard, Niels Jákup

    Greenland, using stereoscopic coverage by aerial photographs recorded in 1985, and subsequent comparative surface elevation data from ICESat (Ice, Cloud and land Elevation Satellite) and ATM (Airborne Topographic Mapper) supplemented with measurements from GPS and the Gravity Recovery and Climate Experiment...... (GRACE) satellite gravity mission, launched in March, 2002. The GRACE results provide a direct measure of mass loss, while the GPS data are used to monitor crustal uplift caused by ice mass loss close to the GPS sites....

  4. LA TRANSFORMACIÓN DEL CONTENIDO BIOLÓGICO EN LOS PRIMEROS AÑOS DE EJERCICIO DOCENTE: RETOS Y DESAFÍOS DE LA INSERCIÓN PROFESIONAL

    Directory of Open Access Journals (Sweden)

    Ma. Mercedes Jiménez Narváez

    2014-05-01

    Full Text Available Enseñar temas como la célula y el sistema excretor en la escuela primaria y secundaria de nuestro país, es una situación normal y recurrente para un profesor de ciencias naturales; estos temas forman parte del currículo y de los planes de estudio del área, en las instituciones educativas públicas y privadas.  Pero, ¿qué ocurre cuando un profesor principiante tiene el encargo de enseñar estos temas?, ¿qué transformación del contenido biológico realiza para compartirlo con sus estudiantes?, ¿qué condiciones institucionales y personales influyen en la toma de decisiones sobre su enseñanza y evaluación?, éstas son algunas de las inquietudes que dieron origen a una tesis doctoral que indaga por la configuración del conocimiento profesional del profesor, en la etapa de la carrera docente conocida como inserción profesional.  Se busca describir y comprender los componentes del conocimiento del profesor desde la perspectiva del Pedagogical Content Knowledge (PCK sugerida por el grupo de Magnusson,  Krajcik  y  Borko  (1999, y además, su relación con los factores de socialización docente propuesta por Jordell (1987.  Los resultados indican que las vivencias de los primeros años de ejercicio docente, las relaciones con los estudiantes y el contexto institucional y social de la profesión, influyen de forma decisiva en los procesos de transformación del contenido a enseñar que realiza un profesor principiante.

  5. LA TRANSFORMACIÓN DEL CONTENIDO BIOLÓGICO EN LOS PRIMEROS AÑOS DE EJERCICIO DOCENTE: RETOS Y DESAFÍOS DE LA INSERCIÓN PROFESIONAL

    Directory of Open Access Journals (Sweden)

    Mercedes Jiménez Narváez

    2014-05-01

    Full Text Available Enseñar temas como la célula y el sistema excretor en la escuela primaria y secundaria de nuestro país, es una situación normal y recurrente para un profesor de ciencias naturales; estos temas forman parte del currículo y de los planes de estudio del área, en las instituciones educativas públicas y privadas.  Pero, ¿qué ocurre cuando un profesor principiante tiene el encargo de enseñar estos temas?, ¿qué transformación del contenido biológico realiza para compartirlo con sus estudiantes?, ¿qué condiciones institucionales y personales influyen en la toma de decisiones sobre su enseñanza y evaluación?, éstas son algunas de las inquietudes que dieron origen a una tesis doctoral[1] que indaga por la configuración del conocimiento profesional del profesor, en la etapa de la carrera docente conocida como inserción profesional.  Se busca describir y comprender los componentes del conocimiento del profesor desde la perspectiva del Pedagogical Content Knowledge (PCK sugerida por el grupo de Magnusson,  Krajcik  y  Borko  (1999, y además, su relación con los factores de socialización docente propuesta por Jordell (1987.  Los resultados indican que las vivencias de los primeros años de ejercicio docente, las relaciones con los estudiantes y el contexto institucional y social de la profesión, influyen de forma decisiva en los procesos de transformación del contenido a enseñar que realiza un profesor principiante.

  6. Arctic tides from GPS on sea ice

    OpenAIRE

    Kildegaard Rose, Stine; Skourup, Henriette; Forsberg, René

    2012-01-01

    The presence of sea-ice in the Arctic Ocean plays a significant role in the Arctic climate. Sea ice dampens the ocean tide amplitude with the result that global tidal models which use only astronomical data perform less accurately in the polar regions. This study presents a kinematic processing of Global Positioning System (GPS) buoys placed on sea-ice at five different sites north of Greenland for the study of sea level height and tidal analysis to improve tidal models in the Central Arctic....

  7. Nuclear-Powered GPS Spacecraft Design Study

    Energy Technology Data Exchange (ETDEWEB)

    Raab, Bernard

    1977-05-01

    This is the final report of a study to investigate the potential benefits of a nuclear (radioisotope) - powered satellite for advanced phases of the Global Positioning System (GPS) program. The critical parameters were: power to user; mean mission duration; orbital predictability; thermal control of on-board frequency standards; and vulnerability. The reference design approach is described, and input data are given for two power systems that are under development: an organic Rankine system and a Brayton cycle system. Reference design details are provided and structural design and analysis are discussed, as well as thermal design and analysis. A higher altitude version is also considered.

  8. GPS-Based AR Games Development Potential

    Directory of Open Access Journals (Sweden)

    Gregorius Alvin Raditya Santoso

    2014-11-01

    Full Text Available The application of new technologies in a game is not a new thing. One example is the application of Augmented Reality (AR technology in game. Many people do not know the application of AR technology in game, although the application of this technology is able to produce a game with unique gameplay. In addition, since AR game is GPS-based, it offers new gaming experience, that is, playing outdoors in which the real world becomes the game arena. This advantage gives the AR technology a huge potential to be developed into a game

  9. Topo-Iberia GPS network: installation complete

    Science.gov (United States)

    Khazaradze, G.

    2009-04-01

    As part of the project, titled "Geociencias en Iberia: Estudios integrados de topografía y evolución 4D: Topo-Iberia", we have established a network of 26 continuous GPS stations, covering the Spanish part of the Iberian Peninsula (22 stations) and Morocco (4 stations). A major objective behind the establishment of this array is to monitor millimeter level deformation of the crust due to the collision of African and Eurasian (including Iberian) tectonic plates. More specific goals of the project include the identification of the areas and/or specific seismic faults which exhibit higher deformation rates, which could imply an increased seismic hazard in these specific areas. The network has been designed as two X-shaped transects crossing the peninsula from NE to SW and NW to SE, with relatively coarse distribution of the stations, superimposed with denser coverage in the seismically active areas of the Betics, Pyrenees and Cantabrian chains. The majority of the built monuments consist of 1.5-1.8 m tall concrete pillars of 40 cm in diameter anchored to the bedrock using iron rebars. One station in Huesca was built according the UNAVCO's short drilled braced monument (SDBM) specifications. All the monuments were equipped with the SCIGN leveling mounts to ensure the precise antenna alignment and re-alignment in case of the antenna replacement, as well as, tamper resistance of the monument mark. In places were the snow accumulation was possible the antennas were covered with plastic radomes. The instrumentation used is Trimble NetRS dual-frequency receivers with choke-ring antennas. The communication is mainly via cellular telephone system. As of December 2008, the network installation has been competed and all the stations are fully operational. Here we report the milestones of the installation of the network and, as well as, present the first preliminary results of the analysis of the data. Besides the newly established Topo-Iberia CGPS stations, we have included

  10. GPS Operations at Olkiluoto, Kivetty and Romuvaara in 2005

    International Nuclear Information System (INIS)

    Ahola, J.; Ollikainen, M.; Koivula, H.; Jokela, J.

    2006-07-01

    The GPS based deformation studies has been made at the investigation areas of Posiva since 1995, when the network of ten GPS pillars was established at Olkiluoto. The network of seven GPS pillars was built at Kivetty and Romuvaara during the year 1996. One pillar in each investigation area belongs to the Finnish permanent GPS network, FinnRef. Twenty GPS measurement campaigns have been carried out at Olkiluoto since 1995, and fourteen campaigns at Kivetty and Romuvaara. According to the time series of the GPS results 1/3 of the baselines at Olkiluoto have statistically significant change rates. However, the observed movements are smaller than ± 0.22 mm/a. There are no statistically signicant movements at Kivetty and Romuvaara expect one pillar at Romuvaara. There are five pillars, which have statistically significant horizontal velocities at Olkiluoto. The local velocity components are small but taking into account the standard deviations the largest velocity components seems to be reliable (maximum velocity is - 0.25 mm/a ± 0.025 mm/a). The uniform scale for the GPS measurements made in different years is the basic condition for reliable results in the deformation analyses. At Olkiluoto a baseline for electronic distance measurements (EDM) was built in 2002. The baseline has been measured using EDM instruments simultaneously with the GPS observations. The comparison between the GPS and EDM results to show a possible scale error of the GPS. The GPS network at Olkiluoto was enlarged in 2003. The new pillars were built close to Kuivalahti village and on a small island of Iso Pyrekari, both north from Olkiluoto. According to the geological evidence it is expected that a fracture zone is located between the new stations, thus enabling the determination of possible deformations along the fracture zone. The new pillars have been observed five times since 2003, but the time series are still too short for reliable deformation studies. Including the new pillars the local

  11. GPS operations at Olkiluoto, Kivetty and Romuvaara in 2006

    International Nuclear Information System (INIS)

    Ahola, J.; Koivula, H.; Poutanen, M.; Jokela, J.

    2007-05-01

    The GPS based deformation studies have been made at the investigation areas of Posiva since 1995, when the network of ten GPS pillars was established at Olkiluoto. The network of seven GPS pillars was built at Kivetty and Romuvaara during the year 1996. One pillar in each investigation area belongs to the Finnish permanent GPS network, FinnRef. 22 GPS measurement campaigns have been carried out at Olkiluoto since 1995, and 15 campaigns at Kivetty and Romuvaara. According to the time series of the GPS results 1/3 of the baselines at Olkiluoto have statistically significant change rates. However, the observed movements are smaller than ± 0.22 mm/a. The networks of Kivetty and Romuvaara are quite stabile expect one pillar at Romuvaara. There are five pillars, which have statistically significant horizontal velocities at Olkiluoto. These local velocity components are small but taking into account the standard deviations the largest velocity components seems to be reliably determined (maximum velocity is -0.23 mm/a ± 0.023 mm/a). The uniform scale for the GPS measurements made in different years is the basic condition for reliable results in the deformation analyses. At Olkiluoto a baseline for electronic distance measurements (EDM) was built in 2002. The baseline has been measured using EDM instruments simultaneously with the GPS observations. The comparison between the GPS and EDM results can solve a possible scale error of the GPS. The GPS network at Olkiluoto was extended in 2003. The new pillars were built close to Kuivalahti village and on a small island of Iso Pyrekari. According to the geological evidence it is expected that a fracture zone is located between the new stations, thus enabling the determination of possible deformations along the fracture zone. The new pillars have been observed since 2003, but the time series are still too short for reliable deformation studies. The local crustal deformations have been studied in GeoSatakunta project, too. This

  12. Uporaba satelitskih sistemov GPS in GLONASS v geodetski izmeri

    OpenAIRE

    Oset, Klemen

    2015-01-01

    V geodetski izmeri GNSS se že nekaj časa za določanje položaja uporabljata hkrati sistema GLONASS in GPS. V diplomski nalogi sta predstavljena GNSS sistema GPS in GLONASS, podobnosti in razlike obeh sistemov ter njune značilnosti pri določitvi položaja. V praktičnem delu naloge so predstavljeni potek meritev, obdelava opazovanj in analiza kakovosti koordinat določenih na osnovi opazovanj GPS, opazovanj GLONASS in skupne uporabe opazovanj GPS in GLONASS.

  13. GPS-based system for satellite tracking and geodesy

    Science.gov (United States)

    Bertiger, Willy I.; Thornton, Catherine L.

    1989-01-01

    High-performance receivers and data processing systems developed for GPS are reviewed. The GPS Inferred Positioning System (GIPSY) and the Orbiter Analysis and Simulation Software (OASIS) are described. The OASIS software is used to assess GPS system performance using GIPSY for data processing. Consideration is given to parameter estimation for multiday arcs, orbit repeatability, orbit prediction, daily baseline repeatability, agreement with VLBI, and ambiguity resolution. Also, the dual-frequency Rogue receiver, which can track up to eight GPS satellites simultaneously, is discussed.

  14. GPS Receivers Use-Case Information : GPS Adjacent Band Compatibility Assessment Workshop

    Science.gov (United States)

    2014-09-18

    Topics 1. Background. 2. Use Case Template. 3. Description of Submitted UseCases from DOT Extended Pos/Nav Working Group. 4. Utilization of UseCase Information. 5. Request of Information for Additional UseCases from GPS Receiver Manufacturer...

  15. GPS on Every Roof, GPS Sensor Network for Post-Seismic Building-Wise Damage Identification

    Directory of Open Access Journals (Sweden)

    Kenji Oguni

    2013-12-01

    Full Text Available Development of wireless sensor network equipped with GPS for post-seismic building-wise damage identification is presented in this paper. This system is called GPS on Every Roof. Sensor node equipped with GPS antenna and receiver is installed on the top of the roof of each and every building. The position of this sensor node is measured before and after earthquake. The final goal of this system is to i identify the displacement of the roof of each house and ii collect the information of displacement of the roof of the houses through wireless communication. Superposing this information on GIS, building-wise damage distribution due to earthquake can be obtained. The system overview, hardware and some of the key components of the system such as on-board GPS relative positioning algorithm to achieve the accuracy in the order of several centimeters are described in detail. Also, the results from a field experiment using a wireless sensor network with 39 sensor nodes are presented.

  16. Análisis de las causas de muerte de los primeros habitantes de la ciudad de La Plata (1887

    Directory of Open Access Journals (Sweden)

    Flores, Olga B.

    2003-01-01

    Full Text Available El presente trabajo constituye un estudio preliminar que forma parte de un proyecto más amplio acreditado por la Universidad Nacional de La Plata y avalado por la Municipalidad de esa localidad "El Cementerio de La Plata. Su contexto histórico". Nuestra investigación se basó fundamentalmente en el análisis de las actas de defunción del Archivo del Cementerio Municipal con el fin de indagar sobre la incidencia diferencial o no de las causas de muerte en relación con la nacionalidad, el sexo, la edad, la profesión, entre otras. Estos datos fueron volcados en planillas con las que se sistematizó la información para toda la población. A partir de esta población, se determinó una muestra compuesta por todos los individuos de ambos sexos que se encuentran en las sepulturas en tierra y abarca el primer año de funcionamiento del Cementerio Municipal. El objetivo del presente trabajo fue caracterizar cómo se distribuyeron las causas de muerte y su incidencia sobre los grupos de edad, género y grupo social, en los decesos ocurridos durante 1887. Según se desprende de los datos analizados, la probabilidad de fallecer antes de cumplir el año de vida es de más del 60%. Las razones para esta alta mortalidad infantil deberán buscarse en las condiciones sanitarias y nutricionales imperantes en la época y para este grupo social, considerando las enfermedades de mayor incidencia en los subadultos; también deben agregarse algunos casos de fallecimiento en los primeros días de vida por falta de desarrollo. En este grupo de edad las causas de muerte más comunes corresponden a las que pertenecen al sistema digestivo, respiratorio, infecciosas y en adultos a enfermedades cardiovasculares, cerebrales, etc.

  17. que particularidades estão associadas a melhores resultados?

    OpenAIRE

    Ribeiro, Pedro Geraldo Almeida

    2013-01-01

    Projeto de Graduação apresentado à Universidade Fernando Pessoa como parte dos requisitos para obtenção do grau de Licenciado em Fisioterapia Objectivo: analisar um conjunto de planos de intervenção com exercício excêntrico, no tratamento da tendinopatia do rotuliano, e definir as características que parecem evidenciar um melhor resultado. Métodos: foi efectuada uma pesquisa bibliográfica em diversas bases de dados utilizando os seguintes termos de pesquisa: “patellar”, “tendin*”, e “eccen...

  18. Ionospheric error analysis in gps measurements

    Directory of Open Access Journals (Sweden)

    G. Pugliano

    2008-06-01

    Full Text Available The results of an experiment aimed at evaluating the effects of the ionosphere on GPS positioning applications are presented in this paper. Specifically, the study, based upon a differential approach, was conducted utilizing GPS measurements acquired by various receivers located at increasing inter-distances. The experimental research was developed upon the basis of two groups of baselines: the first group is comprised of "short" baselines (less than 10 km; the second group is characterized by greater distances (up to 90 km. The obtained results were compared either upon the basis of the geometric characteristics, for six different baseline lengths, using 24 hours of data, or upon temporal variations, by examining two periods of varying intensity in ionospheric activity respectively coinciding with the maximum of the 23 solar cycle and in conditions of low ionospheric activity. The analysis revealed variations in terms of inter-distance as well as different performances primarily owing to temporal modifications in the state of the ionosphere.

  19. TAGGING, TRACKING AND LOCATING WITHOUT GPS

    Energy Technology Data Exchange (ETDEWEB)

    Cordaro, J.; Coleman, T.; Shull, D.

    2012-07-08

    The Savannah River National Laboratory (SRNL) was requested to lead a Law Enforcement Working Group that was formed to collaborate on common operational needs. All agencies represented on the working group ranked their need to tag, track, and locate a witting or unwitting target as their highest priority. Specifically, they were looking for technologies more robust than Global Positioning Satellite (GPS), could communicate back to the owner, and worked where normal cell phone communications did not work or were unreliable. SRNL brought together multiple technologies in a demonstration that was held in in various Alaska venues, including metropolitan, wilderness, and at-sea that met the working group's requirements. Using prototypical technologies from Boeing, On Ramp, and Fortress, SRNL was able to demonstrate the ability to track personnel and material in all scenarios including indoors, in heavily wooden areas, canyons, and in parking garages. In all cases GPS signals were too weak to measure. Bi-directional communication was achieved in areas that Wi-Fi, cell towers, or traditional radios would not perform. The results of the exercise will be presented. These technologies are considered ideal for tracking high value material such has nuclear material with a platform that allows seamless tracking anywhere in the world, indoors or outdoors.

  20. GPS receivers for georeferencing of spatial variability of soil attributes Receptores GPS para georreferenciamento da variabilidade espacial de atributos do solo

    Directory of Open Access Journals (Sweden)

    David L Rosalen

    2011-12-01

    Full Text Available The characterization of the spatial variability of soil attributes is essential to support agricultural practices in a sustainable manner. The use of geostatistics to characterize spatial variability of these attributes, such as soil resistance to penetration (RP and gravimetric soil moisture (GM is now usual practice in precision agriculture. The result of geostatistical analysis is dependent on the sample density and other factors according to the georeferencing methodology used. Thus, this study aimed to compare two methods of georeferencing to characterize the spatial variability of RP and GM as well as the spatial correlation of these variables. Sampling grid of 60 points spaced 20 m was used. For RP measurements, an electronic penetrometer was used and to determine the GM, a Dutch auger (0.0-0.1 m depth was used. The samples were georeferenced using a GPS navigation receiver, Simple Point Positioning (SPP with navigation GPS receiver, and Semi-Kinematic Relative Positioning (SKRP with an L1 geodetic GPS receiver. The results indicated that the georeferencing conducted by PPS did not affect the characterization of spatial variability of RP or GM, neither the spatial structure relationship of these attributes.A caracterização da variabilidade espacial dos atributos do solo é indispensável para subsidiar práticas agrícolas de maneira sustentável. A utilização da geoestatística para caracterizar a variabilidade espacial desses atributos, como a resistência mecânica do solo à penetração (RP e a umidade gravimétrica do solo (UG, é, hoje, prática usual na agricultura de precisão. O resultado da análise geoestatística é dependente da densidade amostral e de outros fatores, como o método de georreferencimento utilizado. Desta forma, o presente trabalho teve como objetivo comparar dois métodos de georreferenciamento para a caracterização da variabilidade espacial da RP e da UG, bem como a correlação espacial dessas vari

  1. Self reported involvement in emergency medicine among GPs in Norway.

    Science.gov (United States)

    Hjortdahl, Magnus; Zakariassen, Erik; Halvorsen, Peder A

    2018-04-10

    To examine general practitioners' (GPs') perception of their role in emergency medicine and participation in emergency services including ambulance call outs, and the characteristics of the GPs and casualty clinics associated with the GPs' involvement in emergency medicine. Cross-sectional online survey. General practice. General practitioners in Norway (n = 1002). Proportion of GPs perceiving that they have a large role in emergency medicine, regularly being on call, and the proportion of ambulance callouts with GP participation. Forty six percent of the GPs indicated that they play a large role in emergency medicine, 63 percent of the GPs were regularly on call, and 28 percent responded that they usually took part in ambulance call outs. Multivariable logistic regression analyses indicated that these outcomes were strongly associated with participation in multidisciplinary training. Furthermore, the main outcomes were associated with traits commonly seen at smaller casualty clinics such as those with an absence of nursing personnel and extra physicians, and based on the distance to the hospital. Our findings suggest that GPs play an important role in emergency medicine. Multidisciplinary team training may be important for their continued involvement in prehospital emergencies. Key Points   Health authorities and other stakeholders have raised concerns about general practitioner's (GPs) participation in emergency medicine, but few have studied opinions and perceptions among the GPs themselves.   • Norwegian GPs report playing a large role in emergency medicine, regularly being on call, and taking part in selected ambulance call outs.   • A higher proportion of GPs who took part in team training perceived themselves as playing a large role in emergency medicine, regularly being on call, and taking part in ambulance call outs.   • These outcomes were also associated with attributes commonly seen at smaller casualty clinics.

  2. Varicocele e infertilidad. Resultados del tratamiento quirúrgico

    Directory of Open Access Journals (Sweden)

    Julio A. Fariñas Martínez

    2015-12-01

    Full Text Available Se realizó un estudio observacional analítico, con el objetivo de precisar los resultados del tratamiento quirúrgico en los pacientes con infertilidad causada por varicocele, en el Hospital General Docente “Dr. Ernesto Guevara de la Serna”, de la provincia de Las Tunas; en el período de enero de 2011 hasta abril de 2012. Se revisaron las historias clínicas de 756 pacientes con varicocele e infertilidad, operados por la técnica de Lewis entre enero de 2008 y diciembre de 2011. Se observó la mayor incidencia en el grupo de edades de 26 a 35 años. La calidad del semen mejoró en el 73.3% después de la operación. El grupo de edades que tuvo mejores resultados en cuanto a calidad del semen y embarazos fue el de 26 a 35 años. Lograron el embarazo el 75% de los pacientes.

  3. Outcome prediction in gastroschisis - The gastroschisis prognostic score (GPS) revisited.

    Science.gov (United States)

    Puligandla, Pramod S; Baird, Robert; Skarsgard, Eric D; Emil, Sherif; Laberge, Jean-Martin

    2017-05-01

    The GPS enables risk stratification for gastroschisis and helps discriminate low from high morbidity groups. The purpose of this study was to revalidate GPS's characterization of a high morbidity group and to quantify relationships between the GPS and outcomes. With REB approval, complete survivor data from a national gastroschisis registry was collected. GPS bowel injury scoring was revalidated excluding the initial inception/validation cohorts (>2011). Length of stay (LOS), 1st enteral feed days (dFPO), TPN days (dTPN), and aggregate complications (COMP) were compared between low and high morbidity risk groups. Mathematical relationships between outcomes and integer increases in GPS were explored using the entire cohort (2005-present). Median (range) LOS, dPO, and dTPN for the entire cohort (n=849) was 36 (26,62), 13 (9,18), and 27 (20,46) days, respectively. High-risk patients (GPS≥2; n=80) experienced significantly worse outcomes than low risk patients (n=263). Each integer increase in GPS was associated with increases in LOS and dTPN by 16.9 and 12.7days, respectively (pGPS effectively discriminates low from high morbidity risk groups. Within the high risk group, integer increases in GPS produce quantitatively differentiated outcomes which may guide initial counseling and resource allocation. IIb. Copyright © 2017 Elsevier Inc. All rights reserved.

  4. Ionospheric correction for spaceborne single-frequency GPS based ...

    Indian Academy of Sciences (India)

    A modified ionospheric correction method and the corresponding approximate algorithm for spaceborne single-frequency Global Positioning System (GPS) users are proposed in this study. Single Layer Model (SLM) mapping function for spaceborne GPS was analyzed. SLM mapping functions at different altitudes were ...

  5. Horses for Courses: Designing a GPS Tracking Data Collection

    DEFF Research Database (Denmark)

    Reinau, Kristian Hegner; Harder, Henrik; Overgård, Christian Hansen

    2014-01-01

    and practical experiences from a number of GPS tracking projects into a practical guideline. Researchers can use this model as a starting point when designing a GPS tracking data collection. The authors hope that the model can constitute a first step towards the development of best practice....

  6. 78 FR 67132 - GPS Satellite Simulator Control Working Group Meeting

    Science.gov (United States)

    2013-11-08

    ... DEPARTMENT OF DEFENSE Department of the Air Force GPS Satellite Simulator Control Working Group... simulator manufacturers, who supply products to the Department of Defense (DoD), and GPS simulator users..., and email address) to [email protected]us.af.mil and have your security personnel submit your VAR...

  7. Two laboratory methods for the calibration of GPS speed meters

    International Nuclear Information System (INIS)

    Bai, Yin; Sun, Qiao; Du, Lei; Yu, Mei; Bai, Jie

    2015-01-01

    The set-ups of two calibration systems are presented to investigate calibration methods of GPS speed meters. The GPS speed meter calibrated is a special type of high accuracy speed meter for vehicles which uses Doppler demodulation of GPS signals to calculate the measured speed of a moving target. Three experiments are performed: including simulated calibration, field-test signal replay calibration, and in-field test comparison with an optical speed meter. The experiments are conducted at specific speeds in the range of 40–180 km h −1 with the same GPS speed meter as the device under calibration. The evaluation of measurement results validates both methods for calibrating GPS speed meters. The relative deviations between the measurement results of the GPS-based high accuracy speed meter and those of the optical speed meter are analyzed, and the equivalent uncertainty of the comparison is evaluated. The comparison results justify the utilization of GPS speed meters as reference equipment if no fewer than seven satellites are available. This study contributes to the widespread use of GPS-based high accuracy speed meters as legal reference equipment in traffic speed metrology. (paper)

  8. Advancing Technology: GPS and GIS Outreach Training for Agricultural Producers

    Science.gov (United States)

    Flynn, Allison; Arnold, Shannon

    2010-01-01

    The use of the Global Positioning System (GPS) and Global Information Systems (GIS) has made significant impacts on agricultural production practices. However, constant changes in the technologies require continuing educational updates. The outreach program described here introduces the operation, use, and applications of GPS receivers and GIS…

  9. Crustal deformations at permanent GPS sites in Denmark

    DEFF Research Database (Denmark)

    Khan, Shfaqat Abbas; Knudsen, Per; Tscherning, Carl Christian

    2005-01-01

    The National Survey and Cadastre (KMS) is responsible for the geodetic definition of the reference network in Denmark. Permanent GPS stations play an important role in the monitoring and maintenance of the geodetic network. During 1998 and 1999 KMS established three permanent GPS station in Denma...

  10. GPS Usage in a Population of Low-Vision Drivers.

    Science.gov (United States)

    Cucuras, Maria; Chun, Robert; Lee, Patrick; Jay, Walter M; Pusateri, Gregg

    2017-01-01

    We surveyed bioptic and non-bioptic low-vision drivers in Illinois, USA, to determine their usage of global positioning system (GPS) devices. Low-vision patients completed an IRB-approved phone survey regarding driving demographics and usage of GPS while driving. Participants were required to be active drivers with an Illinois driver's license, and met one of the following criteria: best-corrected visual acuity (BCVA) less than or equal to 20/40, central or significant peripheral visual field defects, or a combination of both. Of 27 low-vision drivers, 10 (37%) used GPS while driving. The average age for GPS users was 54.3 and for non-users was 77.6. All 10 drivers who used GPS while driving reported increased comfort or safety level. Since non-GPS users were significantly older than GPS users, it is likely that older participants would benefit from GPS technology training from their low-vision eye care professionals.

  11. PDOP values for simulated GPS/Galileo positioning

    DEFF Research Database (Denmark)

    Cederholm, Jens Peter

    2005-01-01

    The paper illustrates satellite coverage and PDOP values for a simulated combined GPS/Galileo system. The designed GPS satellite constellation and the planned Galileo satellite constellation are presented. The combined system is simulated and the number of visible satellites and PDOP values...

  12. Hiking and biking with GPS: The Canadian perspective

    Science.gov (United States)

    Vaníček, Petr

    The paper attempts to review and put into perspective the findings of a recent by-invitation-only workshop on GPS held in Ottawa. The workshop brought together both GPS-information suppliers and consumers coming from all walks of life. Some unique exchanges of views took place which are worth bringing to the attention of the geodetic community.

  13. Effect of forest canopy on GPS-based movement data

    Science.gov (United States)

    Nicholas J. DeCesare; John R. Squires; Jay A. Kolbe

    2005-01-01

    The advancing role of Global Positioning System (GPS) technology in ecology has made studies of animal movement possible for larger and more vagile species. A simple field test revealed that lengths of GPS-based movement data were strongly biased (Pof forest canopy. Global Positioning System error added an average of 27.5% additional...

  14. Stochastic Analysis of Differential GPS Surveys for Earth Dam ...

    African Journals Online (AJOL)

    In GPS measurement, we try to model not just the deterministic part of the measurement but also try to account for their stochastic behavior using the measurement variance-covariance matrix. The variance-covariance matrices are computed as part of a least squares adjustment. In this study, the results of GPS survey by ...

  15. Backyard Botany: Using GPS Technology in the Science Classroom

    Science.gov (United States)

    March, Kathryn A.

    2012-01-01

    Global Positioning System (GPS) technology can be used to connect students to the natural world and improve their skills in observation, identification, and classification. Using GPS devices in the classroom increases student interest in science, encourages team-building skills, and improves biology content knowledge. Additionally, it helps…

  16. Resultados do desenvolvimento de um propulsor à plasma no Brasil

    Science.gov (United States)

    Ferreira, I. S.; Ferreira, J. L.

    2003-08-01

    Uma das partes mais importantes de um satélite é o controle de atitude do mesmo. E se tratando de um satélite científico, a atenção para este sistema deve ser redobrada. Uma possibilidade atraente para executar esta tarefa é a propulsão elétrica. Aqui, mostraremos resultados obtidos pelo propulsor à plasma PHALL-01, desenvolvido na Universidade de Brasília entre 2000 e 2003. Este é derivado do propulsor russo SPT-100 (Stationary Plasma Thruster), mas com o emprego inovador de um arranjo de imãs permanentes como fonte do campo magnético, este último o agente da aceleração do plasma. Esta alteração foi motivada pelo objetivo de que o mesmo operasse com o mínimo de potência elétrica. A partir da formulação teórica do mecanismo de aceleração, tendo como base as equações da magnetohidrodinâmica, pode-se obter vínculos sob os quais o propulsor pudesse ser construído. O mais forte destes é o que dita a topologia do campo magnético. Sendo assim, foram realizadas simulações computacionais, que definiram a geometria do propulsor. Após construído, este foi diagnosticado usando-se sondas de Langmuir e analisadores de energia. Como resultados, obtivemos a distribuição espacial da temperatura, densidade e potencial do plasma, bem como a distribuição angular do feixe produzido pelo mesmo em vários regimes de operação. O espectro de energia do feixe de plasma também foi medido, indicando íons de até 560eV. Combinando estes resultados, calculou-se o empuxo do propulsor: 84mN; e o impulso específico: 1083s. Estes demonstram que o mesmo estará qualificado, num futuro próximo, para o emprego no controle de atitude de satélites científicos, ou até mesmo como parte do conjunto propulsor primário, responsáveis pela transferência de órbitas.

  17. Rip current monitoring using GPS buoy system

    Science.gov (United States)

    Song, DongSeob; Kim, InHo; Kang, DongSoo

    2014-05-01

    The occurrence of rip current in the Haeundae beach, which is one of the most famous beaches in South Korea, has been threatening beach-goers security in summer season annually. Many coastal scientists have been investigating rip currents by using field observations and measurements, laboratory measurements and wave tank experiments, and computer and numerical modeling. Rip current velocity is intermittent and may rapidly increase within minutes due to larger incoming wave groups or nearshore circulation instabilities. It is important to understand that changes in rip current velocity occur in response to changes in incoming wave height and period as well as changes in water level. GPS buoys have been used to acquire sea level change data, atmospheric parameters and other oceanic variables in sea for the purposes of vertical datum determination, tide correction, radar altimeter calibration, ocean environment and marine pollution monitoring. Therefore, we adopted GPS buoy system for an experiment which is to investigate rip current velocity; it is sporadic and may quickly upsurge within minutes due to larger arriving wave groups or nearshore flow uncertainties. In this study, for high accurate positioning of buy equipment, a Satellite Based Argumentation System DGPS data logger was deployed to investigate within floating object, and it can be acquired three-dimensional coordinate or geodetic position of buoy with continuous NMEA-0183 protocol during 24 hours. The wave height measured by in-situ hydrometer in a cross-shore array clearly increased before and after occurrence of rip current, and wave period also was lengthened around an event. These results show that wave height and period correlate reasonably well with long-shore current interaction in the Haeundae beach. Additionally, current meter data and GPS buoy data showed that rip current velocities, about 0.2 m/s, may become dangerously strong under specific conditions. Acknowledgement This research was

  18. How and Why to Do VLBI on GPS

    Science.gov (United States)

    Dickey, J. M.

    2010-01-01

    In order to establish the position of the center of mass of the Earth in the International Celestial Reference Frame, observations of the Global Positioning Satellite (GPS) constellation using the IVS network are important. With a good frame-tie between the coordinates of the IVS telescopes and nearby GPS receivers, plus a common local oscillator reference signal, it should be possible to observe and record simultaneously signals from the astrometric calibration sources and the GPS satellites. The standard IVS solution would give the atmospheric delay and clock offsets to use in analysis of the GPS data. Correlation of the GPS signals would then give accurate orbital parameters of the satellites in the ICRF reference frame, i.e., relative to the positions of the astrometric sources. This is particularly needed to determine motion of the center of mass of the earth along the rotation axis.

  19. Estimering af brændstofforbrug vha. GPS Data

    DEFF Research Database (Denmark)

    Andersen, Ove; Lahrmann, Harry; Torp, Kristian

    2010-01-01

    Det er simpelt og billigt at opsamle GPS målinger fra køretøjer. Når større mængder GPS data indsamles fra et passende antal køretøjer kan dataen bruges til at beregne f.eks. køretider. Det er ligeledes muligt ud fra GPS data at estimere miljøindikatorer så som, hvor aggressivt kører bilister og er...... der nogle vejstrækninger, der har en højere (negativ) miljø påvirkning end andre? I denne artikel præsenterer et forsøg, hvor GPS data anvendes til at estimere brændstofforbruget ved en enkelt tur og for vejnettet generelt. Dette gøres ved at opbygge en database med GPS data. Ud fra disse data gives...

  20. Radiotracking large wilderness mammals: Integration of GPS and Argos technology

    Science.gov (United States)

    Schwartz, Charles C.; Arthur, Steve M.

    1999-01-01

    We tested 30 prototype global positioning system (GPS) radiocollars on brown bears (Ursus arctos) over a 3-year period on the Kenai Peninsula, Alaska. Collars were of 2 design types: GPS with an Argos (Argos Data collection and Location System) satellite uplink (n=19) and GPS unites where the data were stored on board (n=10) for retrieval at a later date. All units also contained a conventional VHF (very high frequency) transmitter and weighed 1.7 kg. GPS-Argos united obtained 10-82% of expected GPS fixes, and fix rate declined significantly (Pbears varied more and were lower than fix rates for stationary collars placed in various vegetation types, suggesting that the bear, terrain, and movement all influence both fix and uplink success rate. Application of this new technology to grizzly and brown bear research and comparisons to studies with moose (Alces alces) are discussed.

  1. Localization system for use in GPS denied environments

    Energy Technology Data Exchange (ETDEWEB)

    Trueblood, J. J. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

    2017-02-01

    The military uses to autonomous platforms to complete missions to provide standoff for the warfighters. However autonomous platforms rely on GPS to provide their global position. In many missions spaces the autonomous platforms may encounter GPS denied environments which limits where the platform operates and requires the warfighters to takes its place. GPS denied environments can occur due to tall building, trees, canyon wall blocking the GPS satellite signals or a lack of coverage. An Inertial Navigation System (INS) uses sensors to detect the vehicle movement and direction its traveling to calculate the vehicle. One of biggest challenges with an INS system is the accuracy and accumulation of errors over time of the sensors. If these challenges can be overcome the INS would provide accurate positioning information to the autonomous vehicle in GPS denied environments and allow them to provide the desired standoff for the warfighters.

  2. Otra forma de evaluar: Análisis de resultados.

    Directory of Open Access Journals (Sweden)

    Segovia González, Mª Manuela

    2007-01-01

    Full Text Available Desde el curso 2002-2003 se viene aplicando en la asignatura de Matemáticas de primer curso de la Diplomatura de Ciencias Empresariales en la Universidad Pablo de Olavide un método de evaluación especial (llamado Plan de Calidad debido al elevado número de no presentados y suspensos en la citada asignatura.En la primera parte de este trabajo se describe el método de evaluación aplicado y la innovación docente que se ha hecho en la asignatura. En la segunda parte se ha realizado un análisis para ver si con esta nueva metodología los resultados obtenidos por los alumnos son mejores.

  3. Efeito da Idade Materna sobre os Resultados Perinatais

    Directory of Open Access Journals (Sweden)

    Azevedo George Dantas de

    2002-01-01

    Full Text Available Objetivo: analisar a relação entre a idade materna e a ocorrência de resultados perinatais adversos na população do Rio Grande do Norte. Métodos: foram analisados os registros oficiais de 57.088 nascidos vivos no Estado do Rio Grande do Norte no ano de 1997. Os dados foram obtidos do Sistema de Informação sobre Nascidos Vivos do Ministério da Saúde. A população estudada foi dividida em Grupos I, II e III, segundo a faixa etária materna: 10 a 19, 20 a 34 e 35 anos ou mais, respectivamente. As variáveis analisadas foram: duração da gestação, peso ao nascer e tipo de parto. A análise estatística foi realizada utilizando-se o teste chi². Resultados: observamos uma maior incidência de parto pré-termo no Grupo I (4,3 %, em comparação ao Grupo II (3,7% (p = 0,0028. A taxa de cesariana foi menor nos Grupos I e III, em comparação ao Grupo II (p<0,0001. Evidenciamos freqüência significativamente maior de recém-nascidos de baixo peso nos Grupos I (8,4% e III (8,3%, quando comparados ao Grupo II (6,5% (p<0,0001. Conclusões: a gravidez nos extremos da vida reprodutiva esteve associada com maior freqüência de parto pré-termo e baixo peso ao nascer, entretanto, com relação ao tipo de parto, foi observada maior freqüência de parto normal do que no grupo de gestantes com idade entre 20 e 34 anos.

  4. Devices using GPS into driving simulators

    OpenAIRE

    ESPIE, S; GANIEUX, D; TOURNIER, N

    2004-01-01

    Cet article présente un nouvel outil utilisant des données SIG pour obtenir une définition analytique des routes afin que la base de données réponde aux besoins des simulateurs de conduite (modèle dynamique du véhicule, simulation de trafic, module sonore, etc.). Le simulateur peut calculer en temps réel les informations GPS simulées (SIL) et les envoyer au calculateur (HIS) qui fonctionne alors comme s'il équipait un véhicule réel sur une vraie route, dans des conditions réelles.

  5. GPS Software Packages Deliver Positioning Solutions

    Science.gov (United States)

    2010-01-01

    "To determine a spacecraft s position, the Jet Propulsion Laboratory (JPL) developed an innovative software program called the GPS (global positioning system)-Inferred Positioning System and Orbit Analysis Simulation Software, abbreviated as GIPSY-OASIS, and also developed Real-Time GIPSY (RTG) for certain time-critical applications. First featured in Spinoff 1999, JPL has released hundreds of licenses for GIPSY and RTG, including to Longmont, Colorado-based DigitalGlobe. Using the technology, DigitalGlobe produces satellite imagery with highly precise latitude and longitude coordinates and then supplies it for uses within defense and intelligence, civil agencies, mapping and analysis, environmental monitoring, oil and gas exploration, infrastructure management, Internet portals, and navigation technology."

  6. CASA Uno GPS orbit and baseline experiments

    Science.gov (United States)

    Schutz, B. E.; Ho, C. S.; Abusali, P. A. M.; Tapley, B. D.

    1990-01-01

    CASA Uno data from sites distributed in longitude from Australia to Europe have been used to determine orbits of the GPS satellites. The characteristics of the orbits determined from double difference phase have been evaluated through comparisons of two-week solutions with one-week solutions and by comparisons of predicted and estimated orbits. Evidence of unmodeled effects is demonstrated, particularly associated with the orbit planes that experience solar eclipse. The orbit accuracy has been assessed through the repeatability of unconstrained estimated baseline vectors ranging from 245 km to 5400 km. Both the baseline repeatability and the comparison with independent space geodetic methods give results at the level of 1-2 parts in 100,000,000. In addition, the Mojave/Owens Valley (245 km) and Kokee Park/Ft. Davis (5409 km) estimates agree with VLBI and SLR to better than 1 part in 100,000,000.

  7. Somnolencia y fatiga materna en los primeros años de crianza y ejecución en la conducción evaluada en simulador

    OpenAIRE

    Sánchez García, M. Mar

    2017-01-01

    RESUMEN DE LA TESIS DOCTORAL Somnolencia y fatiga materna en los primeros años de crianza y ejecución en la conducción evaluada en simulador El nacimiento de un bebé y la crianza posterior durante la primera infancia supone un considerable esfuerzo para madres y padres, que provoca cambios profundos en la familia, tanto si se trata del primer hijo/a como de la incorporación de un nuevo miembro más a la familia. Un bebé recién nacido necesita atención constante por parte de sus cuidador...

  8. Relación entre las disposiciones cognitivas y el pensamiento científico, utilizados en entornos escolares por estudiantes de primero de primaria

    OpenAIRE

    Rojas Sánchez, Luz Elena

    2010-01-01

    Esta investigación busca reconocer la relación entre la disposición cognitiva y el pensamiento científico, utilizados en entornos escolares por estudiantes de primero primaria, basada por una parte en la teoría de las Disposiciones cognitivas del profesor Ritchhart, que sostiene que existen al menos tres disposiciones de pensamiento : Disposición cognitiva hacia el pensamiento creativo, el reflexivo y el crítico| por otra parte el concepto de pensamiento científico, se basa en reflexiones ela...

  9. Los primeros auxilios psicológicos en el servicio de atención al ciudadano desde un enfoque humanista

    OpenAIRE

    Adelaida Valencia Puentes; Jenny Trejos García

    2013-01-01

    Alteraciones emocionales producto de eventos potencialmente traumáticos: desastres naturales y problemáticas de tipo social, afectivo y económico sonprioridades que el Policía debe aprender a manejar para mejorar la atención en su servicio. Desde esta perspectiva, es importante incluir los Primeros Auxilios Psicológicos, dentro de la formación integral del Policía, en el entendido de que constitucionalmente “La Policía Nacional es un cuerpo armado permanente de naturaleza civil, a cargo de la...

  10. Ontologies and Epistemologies to Achieve Knowledge in Sor Juana Ines de la Cruz’s Poem «Primero Sueño»

    Directory of Open Access Journals (Sweden)

    Lydia Deni Gamboa López

    2017-11-01

    Full Text Available In this article, I propose reading one section of sor Juana Inés de la Cruz’s poem «Primero Sueño» as a philosophical reflexion about the discussion between realists and nominalists, on the one hand, and as a reflexion about the preferable based realist/nominalist methodology on the other hand. The realist perspective presented in this poem has a Platonic-Augustinian character. The nominalist perspective —an ontology which sor Juana seems to have preferred— has an Ockhamist vein.

  11. Ecuación que obtiene con buena aproximación la suma de los primeros enteros a cualquier potencia entera positiva

    Directory of Open Access Journals (Sweden)

    Luis Manuel Montaño Zetina

    2013-12-01

    Full Text Available En este trabajo se presenta un análisis numérico para obtener un método sencillo que calcule la suma de los primeros enteros, de 1 hasta n, elevados a cualquier potencia entera k. El aspecto más importante durante el análisis fue la obtención de una expresión de sólo tres términos para calcular la suma final de manera precisa con una diferencia porcentual relativamente pequeña. Asimismo, se presenta un estudio de esta diferencia porcentual que compara la suma precisa y la exacta.

  12. Procesos químicos con oxigeno y nitrógeno sobre beta-cristobalita: estudio teórico desde primeros principios.

    OpenAIRE

    Arasa Cid, Carina

    2007-01-01

    El objetivo principal de esta tesis es el estudio de los procesos fisico-químicos que tienen lugar en las interfases gas-superficie sólida, partiendo desde primeros principios y haciendo un estudio de estructura electrónica, dinámico y cinético de los mismos.En particular, se pretende hacer un estudio teórico de algunas de las reacciones producidas en las superficies de los vehículos espaciales durante su reentrada en la atmósfera de la Tierra (78% N2, 21% O2, y 1% Ar). Estos vehículos llegan...

  13. Aproximadamente 1 de cada 5 bebés de madres adolescentes no es el primero (Preventing Repeat Teen Births)

    Centers for Disease Control (CDC) Podcasts

    2013-04-02

    Este podcast se basa en el informe de los CDC Vital Signs, de abril del 2013, que dice que aproximadamente 1 de cada 5 bebés de madres adolescentes no es el primero, y trata la manera en que los adolescentes, sus padres y tutores legales, los proveedores de atención médica y las comunidades pueden ayudar en la prevención.  Created: 4/2/2013 by Centers for Disease Control and Prevention (CDC).   Date Released: 4/2/2013.

  14. Lactancia materna y diarrea aguda en los primeros tres meses de vida Breast feeding and the incidence of acute diarrhea during the first three months of life

    Directory of Open Access Journals (Sweden)

    Claudia Macías-Carrillo

    2005-02-01

    Full Text Available OBJETIVO: Evaluar el efecto de la lactancia materna exclusiva y sus interacciones con algunos factores socioeconómicos, en relación con la incidencia de diarrea aguda durante los primeros tres meses de la vida. MATERIAL Y MÉTODOS: En la ciudad de Durango, México, en 1994 se llevó a cabo un estudio de cohorte con tres meses de seguimiento; la muestra estuvo compuesta por 327 parejas de madre y recién nacido, residentes de la ciudad de Durango, durante el periodo abril-junio de 1994. Para el análisis se utilizaron técnicas descriptivas, análisis bivariados y modelos multivariados de regresión logística con efectos aleatorios. RESULTADOS: Los niños que no reciben lactancia exclusiva al seno materno tienen un riesgo significativamente elevado de padecer diarrea aguda desde el inicio de la vida (RMlactancia mixta= 3.23; IC 95% 1.84-5.68 y RMlactancia artificial=4.36; IC 95% 2.32-8.19. Además, el efecto protector de la lactancia al seno materno es independiente del que tienen factores de riesgo tales como la educación materna deficiente, la falta de apoyo social y el hecho de que la madre sea adolescente. Sin embargo, en el caso especial del saneamiento ambiental encontramos evidencia de una posible modificación del efecto respecto al tipo de lactancia (deltaG=9.26; p=0.09, que se traduce en una razón de momios para la carencia de agua y drenaje mayor que la suma de las RM para cada condición por separado (RMno agua/no drenaje = 2.58; IC 95% 1.10-6.03, en el modelo multivariante final. CONCLUSIONES: Al igual que estudios previos encontramos que la lactancia exclusiva al seno materno tiene una gran importancia, a pesar de que en el entorno persistan condiciones adversas ligadas a la pobreza y al subdesarrollo socioeconómico. En especial, parece que la protección que confiere la lactancia al seno es todavía mayor cuando se carece de las condiciones básicas de saneamiento, lo cual, a su vez, se traduce en oportunidades de intervenci

  15. Multiscale GPS tomography during COPS: validation and applications

    Science.gov (United States)

    Champollion, Cédric; Flamant, Cyrille; Masson, Frédéric; Gégout, Pascal; Boniface, Karen; Richard, Evelyne

    2010-05-01

    Accurate 3D description of the water vapour field is of interest for process studies such as convection initiation. None of the current techniques (LIDAR, satellite, radio soundings, GPS) can provide an all weather continuous 3D field of moisture. The combination of GPS tomography with radio-soundings (and/or LIDAR) has been used for such process studies using both advantages of vertically resolved soundings and high temporal density of GPS measurements. GPS tomography has been used at short scale (10 km horizontal resolution but in a 50 km² area) for process studies such as the ESCOMPTE experiment (Bastin et al., 2005) and at larger scale (50 km horizontal resolution) during IHOP_2002. But no extensive statistical validation has been done so far. The overarching goal of the COPS field experiment is to advance the quality of forecasts of orographically induced convective precipitation by four-dimensional observations and modeling of its life cycle for identifying the physical and chemical processes responsible for deficiencies in QPF over low-mountain regions. During the COPS field experiment, a GPS network of about 100 GPS stations has been continuously operating during three months in an area of 500 km² in the East of France (Vosges Mountains) and West of Germany (Black Forest). If the mean spacing between the GPS is about 50 km, an East-West GPS profile with a density of about 10 km is dedicated to high resolution tomography. One major goal of the GPS COPS experiment is to validate the GPS tomography with different spatial resolutions. Validation is based on additional radio-soundings and airborne / ground-based LIDAR measurement. The number and the high quality of vertically resolved water vapor observations give an unique data set for GPS tomography validation. Numerous tests have been done on real data to show the type water vapor structures that can be imaging by GPS tomography depending of the assimilation of additional data (radio soundings), the

  16. The Performance Analysis of a Real-Time Integrated INS/GPS Vehicle Navigation System with Abnormal GPS Measurement Elimination

    Directory of Open Access Journals (Sweden)

    Jhen-Kai Liao

    2013-08-01

    Full Text Available The integration of an Inertial Navigation System (INS and the Global Positioning System (GPS is common in mobile mapping and navigation applications to seamlessly determine the position, velocity, and orientation of the mobile platform. In most INS/GPS integrated architectures, the GPS is considered to be an accurate reference with which to correct for the systematic errors of the inertial sensors, which are composed of biases, scale factors and drift. However, the GPS receiver may produce abnormal pseudo-range errors mainly caused by ionospheric delay, tropospheric delay and the multipath effect. These errors degrade the overall position accuracy of an integrated system that uses conventional INS/GPS integration strategies such as loosely coupled (LC and tightly coupled (TC schemes. Conventional tightly coupled INS/GPS integration schemes apply the Klobuchar model and the Hopfield model to reduce pseudo-range delays caused by ionospheric delay and tropospheric delay, respectively, but do not address the multipath problem. However, the multipath effect (from reflected GPS signals affects the position error far more significantly in a consumer-grade GPS receiver than in an expensive, geodetic-grade GPS receiver. To avoid this problem, a new integrated INS/GPS architecture is proposed. The proposed method is described and applied in a real-time integrated system with two integration strategies, namely, loosely coupled and tightly coupled schemes, respectively. To verify the effectiveness of the proposed method, field tests with various scenarios are conducted and the results are compared with a reliable reference system.

  17. Exatidão de posicionamento de um receptor GPS, operando sob diferentes coberturas vegetais Evaluation of the accuracy of positioning a GPS receiver operating under different vegetation covers

    Directory of Open Access Journals (Sweden)

    Rubens Angulo Filho

    2002-01-01

    Full Text Available Para avaliar a exatidão de posicionamento planimétrico do receptor GPS Trimble/Pro-XL, operando sob diferentes condições de cobertura vegetal (pastagem, seringueira, eucalipto e pinus, o equipamento foi posicionado alternadamente sobre 6 pontos, locados ao acaso nas áreas de estudo, variando o tempo de permanência (1 , 5 e 10 min mas com a mesma taxa de aquisição de dados (1 s fazendo-se, posteriormente, a correção diferencial (DGPS pós-processada dos dados. Os pontos também tiveram suas coordenadas levantadas pelo método topográfico, segundo a NBR 13133 - Execução de Levantamento Topográfico, para fins de comparação. De acordo com o método empregado e os resultados obtidos, foi possível separar as exatidões de posicionamento planimétrico, conforme o tipo de cobertura vegetal, em dois grupos: sem e com cobertura arbórea confirmando, assim, a interferência do dossel na recepção dos sinais emitidos pelos satélites GPS. O aumento do tempo de permanência melhorou a exatidão de posicionamento planimétrico, o que ratifica a escolha da metodologia de levantamento como sendo fundamental para a obtenção de bons resultados de posicionamento.To evaluate planimetric positioning accuracy of a GPS receiver (Trimble/Pro-XL, operating under different conditions of vegetation cover (pasture, rubber trees, eucalyptus and pine trees, 6 control points were located randomly in the study area. For comparison, their coordinates were first obtained by a conventional surveying method, according to NBR 13133 of Brazilian Surveying Standards. Afterwards, the GPS receiver was positioned on those control points, maintaining the acquisition rate of 1 s while changing the time for 1, 5 and 10 min, the DGPS method was used to correct the positioning coordinate data. According to the methodology applied and the results obtained, it was possible to distinguish planimetric positioning accuracy, according to the vegetation cover, in two groups

  18. Performance of GPS-devices for environmental exposure assessment.

    Science.gov (United States)

    Beekhuizen, Johan; Kromhout, Hans; Huss, Anke; Vermeulen, Roel

    2013-01-01

    Integration of individual time-location patterns with spatially resolved exposure maps enables a more accurate estimation of personal exposures to environmental pollutants than using estimates at fixed locations. Current global positioning system (GPS) devices can be used to track an individual's location. However, information on GPS-performance in environmental exposure assessment is largely missing. We therefore performed two studies. First, a commute-study, where the commute of 12 individuals was tracked twice, testing GPS-performance for five transport modes and two wearing modes. Second, an urban-tracking study, where one individual was tracked repeatedly through different areas, focused on the effect of building obstruction on GPS-performance. The median error from the true path for walking was 3.7 m, biking 2.9 m, train 4.8 m, bus 4.9 m, and car 3.3 m. Errors were larger in a high-rise commercial area (median error=7.1 m) compared with a low-rise residential area (median error=2.2 m). Thus, GPS-performance largely depends on the transport mode and urban built-up. Although ~85% of all errors were 50 m. Modern GPS-devices are useful tools for environmental exposure assessment, but large GPS-errors might affect estimates of exposures with high spatial variability.

  19. La memoria literaria de la emigración: el surgimiento de los primeros textos de origen español (1964-1989

    Directory of Open Access Journals (Sweden)

    Ana Ruiz

    2014-06-01

    Full Text Available Los primeros textos literarios escritos por los emigrantes nacen como fruto de una imperiosa necesidad de comunicación, en un principio únicamente con otros trabajadores extranjeros de su misma nacionalidad. Dado que los principales órganos de comunicación entre emigrantes de la misma nacionalidad eran los centros nacionales, las asociaciones asistenciales de apoyo a la emigración y las llamadas iniciativas de autoayuda, es en estos marcos en donde encontramos los primeros textos. Cada nacionalidad presente en la República Federal tuvo sus representaciones culturales institucionales (Centro Español, Casa de Italia u otros y sus iniciativas particulares, constituidas en asociaciones como la Confederación de Asociaciones Españolas de Padres de Familia en la RFA o, en el ámbito italiano, la Associazione Letteraria Facoltà Artistiche (ALFA, la Federazione Italiana Sport e Cultura (FISC o la Unione Cristiana Emigranti Italiani (UCEI. Los objetivos generales que todas compartían eran los de fomentar la conservación de la cultura de origen, asesorar al emigrante en sus dificultades con la administración alemana y ser foro de expresión y reivindicación.

  20. Why GPS makes distances bigger than they are.

    Science.gov (United States)

    Ranacher, Peter; Brunauer, Richard; Trutschnig, Wolfgang; Van der Spek, Stefan; Reich, Siegfried

    2016-02-01

    Global navigation satellite systems such as the Global Positioning System (GPS) is one of the most important sensors for movement analysis. GPS is widely used to record the trajectories of vehicles, animals and human beings. However, all GPS movement data are affected by both measurement and interpolation errors. In this article we show that measurement error causes a systematic bias in distances recorded with a GPS; the distance between two points recorded with a GPS is - on average - bigger than the true distance between these points. This systematic 'overestimation of distance' becomes relevant if the influence of interpolation error can be neglected, which in practice is the case for movement sampled at high frequencies. We provide a mathematical explanation of this phenomenon and illustrate that it functionally depends on the autocorrelation of GPS measurement error ( C ). We argue that C can be interpreted as a quality measure for movement data recorded with a GPS. If there is a strong autocorrelation between any two consecutive position estimates, they have very similar error. This error cancels out when average speed, distance or direction is calculated along the trajectory. Based on our theoretical findings we introduce a novel approach to determine C in real-world GPS movement data sampled at high frequencies. We apply our approach to pedestrian trajectories and car trajectories. We found that the measurement error in the data was strongly spatially and temporally autocorrelated and give a quality estimate of the data. Most importantly, our findings are not limited to GPS alone. The systematic bias and its implications are bound to occur in any movement data collected with absolute positioning if interpolation error can be neglected.

  1. Assessing the role of GPs in Nordic health care systems.

    Science.gov (United States)

    Quaye, Randolph K

    2016-05-03

    Purpose This paper examines the changing role of general practitioners (GPs) in Nordic countries of Sweden, Norway and Denmark. It aims to explore the "gate keeping" role of GPs in the face of current changes in the health care delivery systems in these countries. Design/methodology/approach Data were collected from existing literature, interviews with GPs, hospital specialists and representatives of Danish regions and Norwegian Medical Association. Findings The paper contends that in all these changes, the position of the GPs in the medical division of labor has been strengthened, and patients now have increased and broadened access to choice. Research limitations/implications Health care cost and high cancer mortality rates have forced Nordic countries of Sweden, Norway and Denmark to rethink their health care systems. Several attempts have been made to reduce health care cost through market reform and by strenghtening the position of GPs. The evidence suggests that in Norway and Denmark, right incentives are in place to achieve this goal. Sweden is not far behind. The paper has limitations of a small sample size and an exclusive focus on GPs. Practical implications Anecdotal evidence suggests that physicians are becoming extremely unhappy. Understanding the changing status of primary care physicians will yield valuable information for assessing the effectiveness of Nordic health care delivery systems. Social implications This study has wider implications of how GPs see their role as potential gatekeepers in the Nordic health care systems. The role of GPs is changing as a result of recent health care reforms. Originality/value This paper contends that in Norway and Denmark, right incentives are in place to strengthen the position of GPs.

  2. Accuracy assessment of high-rate GPS measurements for seismology

    Science.gov (United States)

    Elosegui, P.; Davis, J. L.; Ekström, G.

    2007-12-01

    Analysis of GPS measurements with a controlled laboratory system, built to simulate the ground motions caused by tectonic earthquakes and other transient geophysical signals such as glacial earthquakes, enables us to assess the technique of high-rate GPS. The root-mean-square (rms) position error of this system when undergoing realistic simulated seismic motions is 0.05~mm, with maximum position errors of 0.1~mm, thus providing "ground truth" GPS displacements. We have acquired an extensive set of high-rate GPS measurements while inducing seismic motions on a GPS antenna mounted on this system with a temporal spectrum similar to real seismic events. We found that, for a particular 15-min-long test event, the rms error of the 1-Hz GPS position estimates was 2.5~mm, with maximum position errors of 10~mm, and the error spectrum of the GPS estimates was approximately flicker noise. These results may however represent a best-case scenario since they were obtained over a short (~10~m) baseline, thereby greatly mitigating baseline-dependent errors, and when the number and distribution of satellites on the sky was good. For example, we have determined that the rms error can increase by a factor of 2--3 as the GPS constellation changes throughout the day, with an average value of 3.5~mm for eight identical, hourly-spaced, consecutive test events. The rms error also increases with increasing baseline, as one would expect, with an average rms error for a ~1400~km baseline of 9~mm. We will present an assessment of the accuracy of high-rate GPS based on these measurements, discuss the implications of this study for seismology, and describe new applications in glaciology.

  3. Acute respiratory illnesses in the first 18 months of life Enfermedades respiratorias agudas en los primeros 18 meses de vida

    Directory of Open Access Journals (Sweden)

    Ilse M. López Bravo

    1997-01-01

    Full Text Available To help assess the causes and frequency of acute respiratory illnesses (ARI during the first 18 months of life in Chile, a cohort of 437 children born in good health between May 1991 and April 1992 was followed at an urban health clinic in northern Santiago. Information was obtained from medical checkups performed at the clinic, from emergency health care services, from private physicians, and from interviews with each child's mother when the child was enrolled in the study and when it was 6, 12, and 18 months old. Followup was completed for 379 (87% of the children. ARI accounted for 67% of all 3762 episodes of illness recorded for these children in the 18-month study period, 1384 (55% of the ARI episodes affecting the upper respiratory tract and the remaining 1144 (45% affecting the lower. The overall rate of ARI observed was 33 episodes per 100 child-months of observation. The incidences of upper, lower, and total ARI episodes decreased significantly in the third six months of life. A statistically significant association was found between upper ARI ( > or = 2 episodes and maternal smoking ( > or = 5 cigarettes per day, but no significant associations were found with any of the other risk factors studied. However, lower ARI ( > or = 2 episodes was significantly associated with maternal schooling ( or = 4 episodes was significantly associated with these factors and also with the existence of one or more siblings, birth in a cold season, limited breast-feeding (Para conocer las causas y frecuencia de las enfermedades respiratorias agudas (ERA durante los primeros 18 meses de vida en una población chilena, se siguió, en un consultorio urbano del norte de Santiago, a una cohorte de 437 niños nacidos sanos entre mayo de 1991 y abril de 1992. La información se obtuvo de los controles médicos realizados en el consultorio, del servicio de urgencia y de médicos particulares, así como de entrevistas a las madres al incorporar a los niños en el

  4. Arctic Tides from GPS on sea-ice

    DEFF Research Database (Denmark)

    Kildegaard Rose, Stine; Skourup, Henriette; Forsberg, René

    2013-01-01

    The presence of sea-ice in the Arctic Ocean plays a significant role in the Arctic climate. Sea-ice dampens the ocean tide amplitude with the result that global tidal models perform less accurately in the polar regions. This paper presents, a kinematic processing of global positioning system (GPS....... The results show coherence between the GPS buoy measurements, and the tide model. Furthermore, we have proved that the reference ellipsoid of WGS84, can be interpolated to the tidal defined zero level by applying geophysical corrections to the GPS data....

  5. GPs and end of life decisions : views and experiences

    OpenAIRE

    Abela, Jurgen

    2015-01-01

    The views and experiences of GPs with respect to end of life (EoL) care are seldom addressed. The aim of this article is to better understand this aspect of care. A cross-sectional survey of all doctors in the country was designed and set up. The overall response was 396 (39.7%), 160 of which were GPs. 28.7% of GPs received no formal training in palliative medicine. 89.8% of respondents declared that their religion was important in EoL care. 45.3% agreed with the right of a patient to decide ...

  6. Influence of Ephemeris Error on GPS Single Point Positioning Accuracy

    Science.gov (United States)

    Lihua, Ma; Wang, Meng

    2013-09-01

    The Global Positioning System (GPS) user makes use of the navigation message transmitted from GPS satellites to achieve its location. Because the receiver uses the satellite's location in position calculations, an ephemeris error, a difference between the expected and actual orbital position of a GPS satellite, reduces user accuracy. The influence extent is decided by the precision of broadcast ephemeris from the control station upload. Simulation analysis with the Yuma almanac show that maximum positioning error exists in the case where the ephemeris error is along the line-of-sight (LOS) direction. Meanwhile, the error is dependent on the relationship between the observer and spatial constellation at some time period.

  7. Miastenia gravis: resultados de timectomia em 52 pacientes

    Directory of Open Access Journals (Sweden)

    José Teotonio de Oliveira

    1995-06-01

    Full Text Available Durante o período de 1971 a 1993, 52 miastênicos sem timoma (7 homens e 45 mulheres foram timectomizados por via esternal. Os resultados foram classificados em remissão e não-remissão . A taxa de remissão foi 48%. No grupo de remissões havia 5 homens e 20 mulheres. O tempo de seguimento foi de 5,5 anos em ambos os grupos. Os pacientes foram classificados clinicamente segundo a classificação de Osserman. De 16 pacientes na categoria II A, 11 entraram em remissão; de 36 pacientes nas categorias II B e III, 14 entraram em remissão. O tempo de duração de doença foi de 1,8 e 4,3 anos nos grupos de remissões e não-remissões, respectivamente. Todos os pacientes que entraram em remissão tinham menos de quatro anos de doença. Dos 43 pacientes com menos de quatro anos de doença, 42% não apresentaram remissão significando que um tempo de doença de menos de quatro anos não é indicador de remissão. Nossos dados indicam um melhor prognóstico quando a timectomia é feita nos primeiros quatro anos de doença.

  8. Qualidade de vida, ponto de partida ou resultado final?

    Directory of Open Access Journals (Sweden)

    Alby Duarte Rocha

    Full Text Available O que é qualidade de vida e o quanto podemos medir dela? Pensa-se em qualidade de vida como resultado das políticas públicas e desenvolvimento de uma sociedade, onde os determinantes socioambientais se manifestam como atributo de seus atores. Ao mesmo tempo, pode-se entender esta idéia no outro extremo da análise, a partir da percepção de uma população protagonista de sua realidade, do que vem a ser qualidade de vida segundo ela mesma. Partindo-se dos aspectos conceituais de qualidade de vida, passou-se a adotar os conceitos de diferenciais intra-urbanos como a melhor maneira de caracterizar os desajustes e as desigualdades urbanas, para assim entender os componentes da iniqüidade desse meio. A primeira iniciativa marcou a utilização do método genebrino ou distancial. Hoje, já na segunda versão desse método, incorporou-se a esse contexto outras metodologias que possibilitam maior consistência de análise para ampliar a validade dessas medições. Soma-se a esse contexto, a análise de cluster e o Sistema de Informações Geográficas, tanto no cenário intra-urbano, quanto intermunicipal.

  9. GPS operations at Olkiluoto, Kivetty and Romuvaara in 2008

    International Nuclear Information System (INIS)

    Kallio, U.; Ahola, J.; Koivula, H.; Jokela, J.; Poutanen, M.

    2009-09-01

    The GPS based deformation studies have been made at the investigation areas of Posiva since 1995, when the network of ten GPS pillars was established at Olkiluoto. The network of seven GPS pillars was built at Kivetty and Romuvaara during the year 1996. One pillar in each investigation area belongs to the Finnish permanent GPS network, FinnRef. A total of 26 GPS measurement campaigns have been carried out at Olkiluoto since 1995, and 17 campaigns at Kivetty and Romuvaara. According to the time series of the GPS results 1/3 of the baselines at Olkiluoto have statistically significant change rates. However, the observed movements are smaller than 0.20 mm/a. The networks of Kivetty and Romuvaara are quite stable expect one pillar at Romuvaara. There are seven pillars, which have statistically significant horizontal velocities at Olkiluoto. These local velocity components are small but taking into account the standard deviations the largest velocity components seems to be reliably determined. The uniform scale for the GPS measurements made in different years is the basic condition for reliable results in the deformation analyses. At Olkiluoto a baseline for electronic distance measurements (EDM) was built in 2002. The baseline has been measured using EDM instruments in connection to the GPS observations. The comparison between the GPS and EDM results can help to fix a possible scale error of the GPS measurements. The GPS network at Olkiluoto was extended in 2003. The new pillars were built close to Kuivalahti village and on a small island of Iso Pyrekari. According to the geological evidence it is expected that a fracture zone is located between the new stations, thus enabling the determination of possible deformations along the fracture zone. The new pillars have been observed since 2003 and now we have computed the first deformation analysis from the six years data. The local crustal deformations have been studied in GeoSatakunta project, too. This GPS network is

  10. GPS operations at Olkiluoto, Kivetty and Romuvaara in 2007

    International Nuclear Information System (INIS)

    Ahola, J.; Koivula, H.; Jokela, J.

    2008-05-01

    The GPS based deformation studies have been made at the investigation areas of Posiva since 1995, when the network of ten GPS pillars was established at Olkiluoto. The network of seven GPS pillars was built at Kivetty and Romuvaara during the year 1996. One pillar in each investigation area belongs to the Finnish permanent GPS network, FinnRef. 24 GPS measurement campaigns have been carried out at Olkiluoto since 1995, and 16 campaigns at Kivetty and Romuvaara. According to the time series of the GPS results 1/3 of the baselines at Olkiluoto have statistically significant change rates. However, the observed movements are smaller than ± 0.20 mm/a. The networks of Kivetty and Romuvaara are quite stabile expect one pillar at Romuvaara. There are five pillars, which have statistically significant horizontal velocities at Olkiluoto. These local velocity components are small but taking into account the standard deviations the largest velocity components seems to be reliably determined (maximum velocity is -0.22 mm/a ± 0.02 mm/a). The uniform scale for the GPS measurements made in different years is the basic condition for reliable results in the deformation analyses. At Olkiluoto a baseline for electronic distance measurements (EDM) was built in 2002. The baseline has been measured using EDM instruments simultaneously with the GPS observations. The comparison between the GPS and EDM results can solve a possible scale error of the GPS. The GPS network at Olkiluoto was extended in 2003. The new pillars were built close to Kuivalahti village and on a small island of Iso Pyrekari. According to the geological evidence it is expected that a fracture zone is located between the new stations, thus enabling the determination of possible deformations along the fracture zone. The new pillars have been observed since 2003, but the time series are still too short for reliable deformation studies. The local crustal deformations have been studied in GeoSatakunta project, too. This

  11. Geomagnetic Storm Impact On GPS Code Positioning

    Science.gov (United States)

    Uray, Fırat; Varlık, Abdullah; Kalaycı, İbrahim; Öǧütcü, Sermet

    2017-04-01

    This paper deals with the geomagnetic storm impact on GPS code processing with using GIPSY/OASIS research software. 12 IGS stations in mid-latitude were chosen to conduct the experiment. These IGS stations were classified as non-cross correlation receiver reporting P1 and P2 (NONCC-P1P2), non-cross correlation receiver reporting C1 and P2 (NONCC-C1P2) and cross-correlation (CC-C1P2) receiver. In order to keep the code processing consistency between the classified receivers, only P2 code observations from the GPS satellites were processed. Four extreme geomagnetic storms October 2003, day of the year (DOY), 29, 30 Halloween Storm, November 2003, DOY 20, November 2004, DOY 08 and four geomagnetic quiet days in 2005 (DOY 92, 98, 99, 100) were chosen for this study. 24-hour rinex data of the IGS stations were processed epoch-by-epoch basis. In this way, receiver clock and Earth Centered Earth Fixed (ECEF) Cartesian Coordinates were solved for a per-epoch basis for each day. IGS combined broadcast ephemeris file (brdc) were used to partly compensate the ionospheric effect on the P2 code observations. There is no tropospheric model was used for the processing. Jet Propulsion Laboratory Application Technology Satellites (JPL ATS) computed coordinates of the stations were taken as true coordinates. The differences of the computed ECEF coordinates and assumed true coordinates were resolved to topocentric coordinates (north, east, up). Root mean square (RMS) errors for each component were calculated for each day. The results show that two-dimensional and vertical accuracy decreases significantly during the geomagnetic storm days comparing with the geomagnetic quiet days. It is observed that vertical accuracy is much more affected than the horizontal accuracy by geomagnetic storm. Up to 50 meters error in vertical component has been observed in geomagnetic storm day. It is also observed that performance of Klobuchar ionospheric correction parameters during geomagnetic storm

  12. Kinematic-PPP using Single/Dual Frequency Observations from (GPS, GLONASS and GPS/GLONASS) Constellations for Hydrography

    Science.gov (United States)

    Farah, Ashraf

    2018-03-01

    Global Positioning System (GPS) technology is ideally suited for inshore and offshore positioning because of its high accuracy and the short observation time required for a position fix. Precise point positioning (PPP) is a technique used for position computation with a high accuracy using a single GNSS receiver. It relies on highly accurate satellite position and clock data that can be acquired from different sources such as the International GNSS Service (IGS). PPP precision varies based on positioning technique (static or kinematic), observations type (single or dual frequency) and the duration of observations among other factors. PPP offers comparable accuracy to differential GPS with safe in cost and time. For many years, PPP users depended on GPS (American system) which considered the solely reliable system. GLONASS's contribution in PPP techniques was limited due to fail in maintaining full constellation. Yet, GLONASS limited observations could be integrated into GPS-based PPP to improve availability and precision. As GLONASS reached its full constellation early 2013, there is a wide interest in PPP systems based on GLONASS only and independent of GPS. This paper investigates the performance of kinematic PPP solution for the hydrographic applications in the Nile river (Aswan, Egypt) based on GPS, GLONASS and GPS/GLONASS constellations. The study investigates also the effect of using two different observation types; single-frequency and dual frequency observations from the tested constellations.

  13. O GPS e a velocidade constante da luz

    Directory of Open Access Journals (Sweden)

    Paul Marmet

    2000-05-01

    Full Text Available As transformações de Lorentz e a relatividade especial são incapazes de fornecer uma explicação física realística do comportamento da matéria e da luz. Mostraremos aqui que todos esses fenômenos podem ser explicados usando-se a física de Newton e a conservação da massa-energia, sem apelar para a contração espacial ou a dilatação do tempo. Sabemos que o princípio de conservação da massa-energia requer que os relógios funcionem mais devagar em um referencial móvel, e que os corpos físicos tornam-se maiores devido ao acréscimo do raio de Bohr. Estes resultados nos permitem levantar a seguinte questão: A luz viaja com respeito a quê? Por exemplo, quando nos distanciamos a uma velocidade v de uma fonte emissora de luz, que, por sua vez, se desloca com velocidade c, o movimento relativo da radiação é dado por um deslocamento Doppler. Como podemos explicar logicamente que estes fótons parecem chegar até nós a uma velocidade c e não a uma velocidade (c – v? A explicação convencional remete à relatividade especial, mas isto implica em uma esotérica distorção espaço-temporal, que não é compatível com a lógica. Este artigo fornece uma explicação física de como a velocidade da luz é realmente (c – v com respeito ao observador, mesmo se as ferramentas do observador sempre meçam a velocidade representada pelo número c. Explicamos como este problema é crucial no Global Positioning System (GPS – Sistema de Posicionamento Global e na sincronização dos relógios. As transformações de Lorentz tornam-se desnecessárias. Esta aparente constância da velocidade da luz com respeito a um referencial móvel é a mais fascinante ilusão na ciência.

  14. Monitoreo de la calidad de datos GPS continuo: la estacion UNSJ (San Juan, Argentina

    Directory of Open Access Journals (Sweden)

    Alfredo Herrada

    2010-06-01

    Full Text Available Como parte de la red de referencia de operación continua de Argentina, la estación GPS (Global Positioning System denominada UNSJ (Universidad Nacional de San Juan fue establecida en la ciudad de San Juan el 6 de Marzo de 2007. Los datos registrados de UNSJ son ampliamente utilizados en aplicaciones catastrales, y sirven como base para la definición de los marcos de referencia geodésicos nacional y regional. Como una componente fundamental de la infraestructura geodésica, resulta conveniente un eficiente control de calidad de los datos crudos y el monitoreo de la estabilidad de una estación GPS de referencia. En este trabajo se presentan los resultados del control de calidad de las observaciones UNSJ luego de dos anos de operación. Para contro l ar y caracterizar el desempeno del receptor GPS y además el medio ambiente de la estación, se eligieron cuatro índices. Ellos son el número de observaciones, multicamino en L1, multicamino en L2 y ocurrencia de saltos de ciclos. También, se evaluó la estabilidad de largo término de la estación UNSJ a través del análisis de las series temporales de las coordenadas semanales provistas por los centros de cálculo SIRGAS (Sistema de Referencia Geocéntrico para las Américas. Completa este estudio el análisis de las coordenadas calculadas por distintos servicios de procesamiento disponibles en Internet. Nuestros resultados indican que durante el período analizado, el funcionamiento de la estación UNSJ fue satisfactorio, produciendo índices de calidad que son aceptables para estándares internacionales.As a part of the Argentine continuously operating reference station network, a GPS (Global Positioning System station named UNSJ (Universidad Nacional de San Juan was established in San Juan city on 6th March 2007. The recorded data of UNSJ are widely applied to cadastral surveys and serve as the basis for defining national and regional geodetic reference frames. As a key component of the

  15. Resolución experimental y analítica de un problema de dinámica rotacional: interpretación de los resultados

    Directory of Open Access Journals (Sweden)

    Beatriz Rosario Follari

    2016-09-01

    Full Text Available http://dx.doi.org/10.5007/2175-7941.2016v33n2p606   La resolución de problemas y las prácticas de laboratorio son parte esencial de las actividades que deben realizar los estudiantes de Física en sus primeros cursos de Física. Se relata una experiencia de aula en la que se propuso a los estudiantes de Física II del primer año de las carreras Profesorado y Licenciatura en Física, el estudio de un carrete que rueda sin deslizar. La misma constó de dos partes: en la primera se les solicitó que planificaran y llevaran a cabo una experiencia para determinar el momento de inercia del carrete; en la segunda se les pidió el desarrollo analítico para encontrar la aceleración y fuerza de rozamiento al hacerlo rodar. La actividad se llevó a cabo en grupo y los resultados fueron expuestos y discutidos. La propuesta resultó positiva ya que llevó a los estudiantes a expresar sus ideas, a la discusión grupal y promovió la autonomía para planificar experiencias sencillas y llevarlas a cabo. Se puso énfasis en la interpretación de las ecuaciones resultantes.

  16. DOTD standards for GPS data collection accuracy : research project capsule.

    Science.gov (United States)

    2013-12-01

    Global Navigational Satellite Systems (GNSS), which includes GPS technologies : maintained by the United States, are used extensively throughout government : and industry. These technologies continue to revolutionize positional data : collection acti...

  17. Developing a GPS-based truck freight performance measure platform.

    Science.gov (United States)

    2010-05-01

    Although trucks move the largest volume and value of goods in urban areas, relatively little is known about their travel : patterns and how the roadway network performs for trucks. Global positioning systems (GPS) used by trucking : companies to mana...

  18. Wireless GPS fleet tracking system at the University of Albany.

    Science.gov (United States)

    2014-07-01

    This report provides an overview of the project undertaken at the University at Albany to make alternative transportation a more : viable option by implementing a GPS Tracking System on the University bus fleet and broadcasting the bus locations to c...

  19. GPS satellite and receiver instrumental biases estimation using least ...

    Indian Academy of Sciences (India)

    PA) landings. Therefore, GPS augmentation sys- tem is required to provide users with orbit, clock, and ionosphere corrections. The first space-based augmentation system .... detailed structure of the transversal filter consists of 3 basic weight ...

  20. Hurricane Inner-Core Structure as Revealed by GPS Dropwindsondes

    National Research Council Canada - National Science Library

    Leejoice, Robert

    2000-01-01

    New high-resolution information of the vertical thermodynamic and kinematic structure of the hurricane inner-core is now available from aircraft released Global Positioning System (GPS) dropwindsondes...

  1. DARPA looks beyond GPS for positioning, navigating, and timing

    Energy Technology Data Exchange (ETDEWEB)

    Kramer, David

    2014-10-01

    Cold-atom interferometry, microelectromechanical systems, signals of opportunity, and atomic clocks are some of the technologies the defense agency is pursuing to provide precise navigation when GPS is unavailable.

  2. Global Positioning System (GPS) Receiver Design For Multipaths Mitigation

    National Research Council Canada - National Science Library

    Gadallah, El-Sayed

    1998-01-01

    .... This research introduces a new estimator that can detect the presence of multipath, can determine the unknown number of multipath components and can estimate multipath parameters in the GPS receiver...

  3. Using cluster analysis to organize and explore regional GPS velocities

    Science.gov (United States)

    Simpson, Robert W.; Thatcher, Wayne; Savage, James C.

    2012-01-01

    Cluster analysis offers a simple visual exploratory tool for the initial investigation of regional Global Positioning System (GPS) velocity observations, which are providing increasingly precise mappings of actively deforming continental lithosphere. The deformation fields from dense regional GPS networks can often be concisely described in terms of relatively coherent blocks bounded by active faults, although the choice of blocks, their number and size, can be subjective and is often guided by the distribution of known faults. To illustrate our method, we apply cluster analysis to GPS velocities from the San Francisco Bay Region, California, to search for spatially coherent patterns of deformation, including evidence of block-like behavior. The clustering process identifies four robust groupings of velocities that we identify with four crustal blocks. Although the analysis uses no prior geologic information other than the GPS velocities, the cluster/block boundaries track three major faults, both locked and creeping.

  4. A Usability Survey of GPS Avionics Equipment: Some Preliminary Findings

    National Research Council Canada - National Science Library

    Joseph, Kurt

    1999-01-01

    The rapid introduction of Global Positioning System (GPS) receivers for airborne navigation has outpaced the capacity of international aviation authorities to resolve human factors issues that concern safe and efficient use of such devices...

  5. GPs' Perceptions of Cardiovascular Risk and Views on Patient Compliance

    DEFF Research Database (Denmark)

    Barfoed, Benedicte Marie Lind; Jarbøl, Dorte Ejg; Paulsen, Maja Skov

    2015-01-01

    Objective. General practitioners' (GPs') perception of risk is a cornerstone of preventive care. The aims of this interview study were to explore GPs' professional and personal attitudes and experiences regarding treatment with lipid-lowering drugs and their views on patient compliance. Methods....... The material was drawn from semistructured qualitative interviews. We sampled GPs purposively from ten selected practices, ensuring diversity of demographic, professional, and personal characteristics. The GPs were encouraged to describe examples from their own practices and reflect on them and were informed...... that the focus was their personal attitudes and experiences. Systematic text condensation was applied for analysis in order to uncover the concepts and themes. Results. The analysis revealed the following 3 main themes: (1) use of cardiovascular guidelines and risk assessment tools, (2) strategies for managing...

  6. NavCube: A fully realized modernized GPS receiver

    Data.gov (United States)

    National Aeronautics and Space Administration — The goal of this IRAD project is to complete the technology development of the modernized Navigator-SpaceCube GPS receiver (named the NavCube), enabling a potential...

  7. A Mobile GPS Application: Mosque Tracking with Prayer Time Synchronization

    Science.gov (United States)

    Hashim, Rathiah; Ikhmatiar, Mohammad Sibghotulloh; Surip, Miswan; Karmin, Masiri; Herawan, Tutut

    Global Positioning System (GPS) is a popular technology applied in many areas and embedded in many devices, facilitating end-users to navigate effectively to user's intended destination via the best calculated route. The ability of GPS to track precisely according to coordinates of specific locations can be utilized to assist a Muslim traveler visiting or passing an unfamiliar place to find the nearest mosque in order to perform his prayer. However, not many techniques have been proposed for Mosque tracking. This paper presents the development of GPS technology in tracking the nearest mosque using mobile application software embedded with the prayer time's synchronization system on a mobile application. The prototype GPS system developed has been successfully incorporated with a map and several mosque locations.

  8. SMEX02 Airborne GPS Bistatic Radar Data, Iowa

    Data.gov (United States)

    National Aeronautics and Space Administration — This data set contains measurements of Global Positioning System (GPS) signals reflected from the Earth’s surface and collected on an airborne platform. The...

  9. GPS-based satellite tracking system for precise positioning

    Science.gov (United States)

    Yunck, T. P.; Melbourne, W. G.; Thornton, C. L.

    1985-01-01

    NASA is developing a Global Positioning System (GPS) based measurement system to provide precise determination of earth satellite orbits, geodetic baselines, ionospheric electron content, and clock offsets between worldwide tracking sites. The system will employ variations on the differential GPS observing technique and will use a network of nine fixed ground terminals. Satellite applications will require either a GPS flight receiver or an on-board GPS beacon. Operation of the system for all but satellite tracking will begin by 1988. The first major satellite application will be a demonstration of decimeter accuracy in determining the altitude of TOPEX in the early 1990's. By then the system is expected to yield long-baseline accuracies of a few centimeters and instantaneous time synchronization to 1 ns.

  10. A New Indoor Positioning System Architecture Using GPS Signals.

    Science.gov (United States)

    Xu, Rui; Chen, Wu; Xu, Ying; Ji, Shengyue

    2015-04-29

    The pseudolite system is a good alternative for indoor positioning systems due to its large coverage area and accurate positioning solution. However, for common Global Positioning System (GPS) receivers, the pseudolite system requires some modifications of the user terminals. To solve the problem, this paper proposes a new pseudolite-based indoor positioning system architecture. The main idea is to receive real-world GPS signals, repeat each satellite signal and transmit those using indoor transmitting antennas. The transmitted GPS-like signal can be processed (signal acquisition and tracking, navigation data decoding) by the general receiver and thus no hardware-level modification on the receiver is required. In addition, all Tx can be synchronized with each other since one single clock is used in Rx/Tx. The proposed system is simulated using a software GPS receiver. The simulation results show the indoor positioning system is able to provide high accurate horizontal positioning in both static and dynamic situations.

  11. Deployment of Autonomous GPS Stations in Marie Byrd Land, Antartica

    Science.gov (United States)

    Donnellan, A.; Luyendyk, B.; Smith, M.; Dace, G.

    1999-01-01

    During the 1998-1999 Antarctic field season, we installed three autonomous GPS stations in Marie Byrd Land, West Antarctica to measure glacio-isostatic rebound and rates of spreading across the West Antartic Rift System.

  12. GNSS global navigation satellite systems : GPS, GLONASS, Galileo, and more

    CERN Document Server

    Hofmann-Wellenhof, Bernhard; Wasle, Elmar

    2008-01-01

    This book is an extension to the acclaimed scientific bestseller "GPS - Theory and Practice". It covers Global Navigation Satellite Systems (GNSS) and includes the Russian GLONASS, the European system Galileo, and additional systems.

  13. 77 FR 23668 - GPS Satellite Simulator Working Group Notice of Meeting

    Science.gov (United States)

    2012-04-20

    ... DEPARTMENT OF DEFENSE Department of the Air Force GPS Satellite Simulator Working Group Notice of... inform the public that the Global Positioning Systems (GPS) Directorate will be hosting an open GPS Satellite Simulator Working Group (SSWG) meeting for manufacturers of GPS constellation simulators utilized...

  14. Measurements of ionospheric TEC in the direction of GPS satellites and comparison with three ionospheric models

    Directory of Open Access Journals (Sweden)

    E. Zuccheretti

    1997-06-01

    Full Text Available The IEN Galileo Ferraris uses GPS for time and frequency synchronization. To obtain high performance it is important to reduce the error due to the ionospheric time-delay in GPS measurements. Evaluations of TEC in the direction of GPS satellites, obtained from three different ionospheric models, have been compared with corresponding measurements by GPS signal.

  15. Resultados comparativos de exámenes estatales del 2006 al 2012 en la Facultad de Estomatología de Camagüey

    Directory of Open Access Journals (Sweden)

    Sarah Teresita Gutiérrez Martore

    Full Text Available Fundamento: La ampliación de matrícula con la diversidad de vías de ingreso ha constituido un reto en la educación médica y la evaluación de graduación implica la certificación de la competencia de los egresados, por eso se hace necesario analizar los resultados obtenidos en estas etapas. Objetivo: Comparar los resultados de los ejercicios prácticos, teóricos y notas finales obtenidas por los estudiantes presentados a Exámenes Estatales Ordinarios de los cursos del 2006 al 2012 de la Facultad de Estomatología en la Universidad de Ciencias Médicas de Camagüey. Métodos: Se realizó una investigación descriptiva con 410 estudiantes presentados a exámenes estatales ordinarios en el período 2006-2012. Se clasificaron los grupos con menos o más de 40 estudiantes por cursos. Se obtuvieron las calificaciones de cada ejercicio y nota final estatal por cursos. Se utilizó el método porcentual, media aritmética y mediana obtenida en cada curso. Resultados: Los cursos del 2006-2009 sumaron 99 estudiantes y en los cursos del 2009-2012 se incrementaron hasta 311 educandos. En los exámenes estatales prácticos, los grupos pequeños obtuvieron calificación media de 99,2 y una mediana de 99 y 100; en los grupos numerosos las calificaciones disminuyeron hasta llegar a una media de 93 y una mediana de 95. En los exámenes teóricos, en los tres primeros cursos la media de calificación fue 83,5 y en el grupo numeroso de 83,7. Conclusiones: En los resultados se mantiene la calidad de la base científica de la actuación en todos los cursos, pero ha disminuido la del desempeño en los cursos con incremento de estudiantes.

  16. Modificación de actitudes ante el Sida en estudiantes de enfermería: Resultados de una experiencia pedagógica

    Directory of Open Access Journals (Sweden)

    Lidia Fernández Donaire

    Full Text Available El objetivo de este trabajo fue comprobar si una intervención pedagógica fundamentada en una metodología activa, que incluye el trabajo cooperativo y el fomento de la discusión, era capaz de modificar en sentido positivo la actitud de los estudiantes ante el VIH/SIDA. Participaron en el estudio un total de 80 estudiantes de enfermería, divididos en dos grupos; el primero de ellos, formado por 39 estudiantes, constituía el grupo de intervención, donde se llevó a cabo la experiencia pedagógica. El segundo grupo, de 41 sujetos, constituyó el grupo control. Todos los estudiantes respondieron a la Escala de Actitud ante el Sida para Enfermería (EASE antes y después de la intervención. Los resultados muestran que se produjo un aumento positivo de la actitud ante el Sida estadísticamente significativo en el grupo de intervención, después de haber pasado por el período de formación. Por el contrario, en el grupo control, no se observaron diferencias significativas entre las dos medidas. Estos resultados confirman la eficacia de la metodología pedagógica utilizada en el cambio positivo de las actitudes de los estudiantes ante cuestiones que, como el Sida, están mediatizadas por el contexto social y cultural y que son determinantes en la calidad de su futuro trabajo como profesionales de la salud.

  17. Relationships between GPS-signal propagation errors and EISCAT observations

    Directory of Open Access Journals (Sweden)

    N. Jakowski

    1996-12-01

    Full Text Available When travelling through the ionosphere the signals of space-based radio navigation systems such as the Global Positioning System (GPS are subject to modifications in amplitude, phase and polarization. In particular, phase changes due to refraction lead to propagation errors of up to 50 m for single-frequency GPS users. If both the L1 and the L2 frequencies transmitted by the GPS satellites are measured, first-order range error contributions of the ionosphere can be determined and removed by difference methods. The ionospheric contribution is proportional to the total electron content (TEC along the ray path between satellite and receiver. Using about ten European GPS receiving stations of the International GPS Service for Geodynamics (IGS, the TEC over Europe is estimated within the geographic ranges -20°≤ λ ≤40°E and 32.5°≤ Φ ≤70°N in longitude and latitude, respectively. The derived TEC maps over Europe contribute to the study of horizontal coupling and transport proces- ses during significant ionospheric events. Due to their comprehensive information about the high-latitude ionosphere, EISCAT observations may help to study the influence of ionospheric phenomena upon propagation errors in GPS navigation systems. Since there are still some accuracy limiting problems to be solved in TEC determination using GPS, data comparison of TEC with vertical electron density profiles derived from EISCAT observations is valuable to enhance the accuracy of propagation-error estimations. This is evident both for absolute TEC calibration as well as for the conversion of ray-path-related observations to vertical TEC. The combination of EISCAT data and GPS-derived TEC data enables a better understanding of large-scale ionospheric processes.

  18. GPs' perceptions of workload in England: a qualitative interview study.

    Science.gov (United States)

    Croxson, Caroline Hd; Ashdown, Helen F; Hobbs, Fd Richard

    2017-02-01

    GPs report the lowest levels of morale among doctors, job satisfaction is low, and the GP workforce is diminishing. Workload is frequently cited as negatively impacting on commitment to a career in general practice, and many GPs report that their workload is unmanageable. To gather an in-depth understanding of GPs' perceptions and attitudes towards workload. All GPs working within NHS England were eligible. Advertisements were circulated via regional GP e-mail lists and national social media networks in June 2015. Of those GPs who responded, a maximum-variation sample was selected until data saturation was reached. Semi-structured, qualitative interviews were conducted. Data were analysed thematically. In total, 171 GPs responded, and 34 were included in this study. GPs described an increase in workload over recent years, with current working days being long and intense, raising concerns over the wellbeing of GPs and patients. Full-time partnership was generally not considered to be possible, and many participants felt workload was unsustainable, particularly given the diminishing workforce. Four major themes emerged to explain increased workload: increased patient needs and expectations; a changing relationship between primary and secondary care; bureaucracy and resources; and the balance of workload within a practice. Continuity of care was perceived as being eroded by changes in contracts and working patterns to deal with workload. This study highlights the urgent need to address perceived lack of investment and clinical capacity in general practice, and suggests that managing patient expectations around what primary care can deliver, and reducing bureaucracy, have become key issues, at least until capacity issues are resolved. © British Journal of General Practice 2017.

  19. Routing Unmanned Vehicles in GPS-Denied Environments

    OpenAIRE

    Sundar, Kaarthik; Misra, Sohum; Rathinam, Sivakumar; Sharma, Rajnikant

    2017-01-01

    Most of the routing algorithms for unmanned vehicles, that arise in data gathering and monitoring applications in the literature, rely on the Global Positioning System (GPS) information for localization. However, disruption of GPS signals either intentionally or unintentionally could potentially render these algorithms not applicable. In this article, we present a novel method to address this difficulty by combining methods from cooperative localization and routing. In particular, the article...

  20. Environmental radiation monitoring system with GPS (global positioning system)

    International Nuclear Information System (INIS)

    Komoto, Itsuro

    2000-01-01

    This system combines a radiation monitoring car with GPS and a data processor (personal computer). It distributes the position information acquired through GPS to the data such as measured environmental radiation dose rate and energy spectrum. It also displays and edits the data for each measuring position on a map. Transmitting the data to the power station through mobile phone enables plan managers to easily monitor the environmental radiation dose rate nearby and proper emergency monitoring. (author)

  1. Challenges and advantages of using GPS data in outdoor advertisement

    OpenAIRE

    Hecker, Dirk; Körner, Christine; May, Michael

    2011-01-01

    A growing number of companies use mobility data in their day-to-day business. Especially in the area of outdoor advertising, GPS devices have been successfully applied in order to measure poster performance in recent years. Based on personal mobility traces, the quality and precision of performance measures has increased significantly. However, the usage of GPS technology poses several challenges when applied to critical business processes. We will present several challenges and solutions whi...

  2. Software Defined GPS Receiver for International Space Station

    Science.gov (United States)

    Duncan, Courtney B.; Robison, David E.; Koelewyn, Cynthia Lee

    2011-01-01

    JPL is providing a software defined radio (SDR) that will fly on the International Space Station (ISS) as part of the CoNNeCT project under NASA's SCaN program. The SDR consists of several modules including a Baseband Processor Module (BPM) and a GPS Module (GPSM). The BPM executes applications (waveforms) consisting of software components for the embedded SPARC processor and logic for two Virtex II Field Programmable Gate Arrays (FPGAs) that operate on data received from the GPSM. GPS waveforms on the SDR are enabled by an L-Band antenna, low noise amplifier (LNA), and the GPSM that performs quadrature downconversion at L1, L2, and L5. The GPS waveform for the JPL SDR will acquire and track L1 C/A, L2C, and L5 GPS signals from a CoNNeCT platform on ISS, providing the best GPS-based positioning of ISS achieved to date, the first use of multiple frequency GPS on ISS, and potentially the first L5 signal tracking from space. The system will also enable various radiometric investigations on ISS such as local multipath or ISS dynamic behavior characterization. In following the software-defined model, this work will create a highly portable GPS software and firmware package that can be adapted to another platform with the necessary processor and FPGA capability. This paper also describes ISS applications for the JPL CoNNeCT SDR GPS waveform, possibilities for future global navigation satellite system (GNSS) tracking development, and the applicability of the waveform components to other space navigation applications.

  3. GPS Estimates of Integrated Precipitable Water Aid Weather Forecasters

    Science.gov (United States)

    Moore, Angelyn W.; Gutman, Seth I.; Holub, Kirk; Bock, Yehuda; Danielson, David; Laber, Jayme; Small, Ivory

    2013-01-01

    Global Positioning System (GPS) meteorology provides enhanced density, low-latency (30-min resolution), integrated precipitable water (IPW) estimates to NOAA NWS (National Oceanic and Atmospheric Adminis tration Nat ional Weather Service) Weather Forecast Offices (WFOs) to provide improved model and satellite data verification capability and more accurate forecasts of extreme weather such as flooding. An early activity of this project was to increase the number of stations contributing to the NOAA Earth System Research Laboratory (ESRL) GPS meteorology observing network in Southern California by about 27 stations. Following this, the Los Angeles/Oxnard and San Diego WFOs began using the enhanced GPS-based IPW measurements provided by ESRL in the 2012 and 2013 monsoon seasons. Forecasters found GPS IPW to be an effective tool in evaluating model performance, and in monitoring monsoon development between weather model runs for improved flood forecasting. GPS stations are multi-purpose, and routine processing for position solutions also yields estimates of tropospheric zenith delays, which can be converted into mm-accuracy PWV (precipitable water vapor) using in situ pressure and temperature measurements, the basis for GPS meteorology. NOAA ESRL has implemented this concept with a nationwide distribution of more than 300 "GPSMet" stations providing IPW estimates at sub-hourly resolution currently used in operational weather models in the U.S.

  4. Application of GPS systems on a mobile robot

    Science.gov (United States)

    Cao, Peter; Saxena, Mayank; Tedder, Maurice; Mischalske, Steve; Hall, Ernest L.

    2001-10-01

    The purpose of this paper is to describe the use of Global Positioning Systems (GPS) as geographic information and navigational system for a ground based mobile robot. Several low cost wireless systems are now available for a variety of innovative automobile applications including location, messaging and tracking and security. Experiments were conducted with a test bed mobile robot, Bearcat II, for point-to-point motion using a Motorola GPS in June 2001. The Motorola M12 Oncore GPS system is connected to the Bearcat II main control computer through a RS232 interface. A mapping program is used to define a desired route. Then GPS information may be displayed for verification. However, the GPS information is also used to update the control points of the mobile robot using a reinforcement learning method. Local position updates are also used when found in the environment. The significance of the method is in extending the use of GPS to local vehicle control that requires more resolution that is available from the raw data using the adaptive control method.

  5. Profile of English salaried GPs: labour mobility and practice performance.

    Science.gov (United States)

    Ding, Alexander; Hann, Mark; Sibbald, Bonnie

    2008-01-01

    Recent national policy changes have provided greater flexibility in GPs' contracts. One such policy is salaried employment, which offers reduced hours and freedom from out-of-hours and administrative responsibilities, aimed at improving recruitment and retention in a labour market facing regional shortages. To profile salaried GPs and assess their mobility within the labour market. Serial cross-sectional study. All GPs practising in England during the years 1996/1997, 2000/2001, and 2004/2005. Descriptive analyses, logistic regression. Salaried GPs tended to be either younger ( or =65 years), female, or overseas-qualified; they favoured part-time working and personal medical services contracts. Salaried GPs were more mobile than GP principals, and have become increasingly so, despite a trend towards reduced overall mobility in the GP workforce. Practices with salaried GPs scored more Quality and Outcomes Framework points and were located in slightly more affluent areas. Salaried status appears to have reduced limitations in the labour market, leading to better workforce deployment from a GP's perspective. However, there is no evidence to suggest it has relieved inequalities in GP distribution.

  6. GPs' perceptions of resilience training: a qualitative study.

    Science.gov (United States)

    Cheshire, Anna; Hughes, John; Lewith, George; Panagioti, Maria; Peters, David; Simon, Chantal; Ridge, Damien

    2017-10-01

    GPs are reporting increasing levels of burnout, stress, and job dissatisfaction, and there is a looming GP shortage. Promoting resilience is a key strategy for enhancing the sustainability of the healthcare workforce and improving patient care. To explore GPs' perspectives on the content, context, and acceptability of resilience training programmes in general practice, in order to build more effective GP resilience programmes. This was a qualitative study of the perspectives of GPs currently practising in England. GPs were recruited through convenience sampling, and data were collected from two focus groups ( n = 15) and one-to-one telephone interviews ( n = 7). A semi-structured interview approach was used and data were analysed using thematic analysis. Participants perceived resilience training to be potentially of value in ameliorating workplace stresses. Nevertheless, uncertainty was expressed regarding how best to provide training for stressed GPs who have limited time. Participants suspected that GPs most likely to benefit from resilience training were the least likely to engage, as stress and being busy worked against engagement. Conflicting views were expressed about the most suitable training delivery method for promoting better engagement. Participants also emphasised that training should not only place the focus on the individual, but also focus on organisation issues. A multimodal, flexible approach based on individual needs and learning aims, including resilience workshops within undergraduate training and in individual practices, is likely to be the optimal way to promote resilience. © British Journal of General Practice 2017.

  7. Soil Moisture Retrieval Based on GPS Signal Strength Attenuation

    Directory of Open Access Journals (Sweden)

    Franziska Koch

    2016-07-01

    Full Text Available Soil moisture (SM is a highly relevant variable for agriculture, the emergence of floods and a key variable in the global energy and water cycle. In the last years, several satellite missions have been launched especially to derive large-scale products of the SM dynamics on the Earth. However, in situ validation data are often scarce. We developed a new method to retrieve SM of bare soil from measurements of low-cost GPS (Global Positioning System sensors that receive the freely available GPS L1-band signals. The experimental setup of three GPS sensors was installed at a bare soil field at the German Weather Service (DWD in Munich for almost 1.5 years. Two GPS antennas were installed within the soil column at a depth of 10 cm and one above the soil. SM was successfully retrieved based on GPS signal strength losses through the integral soil volume. The results show high agreement with measured and modelled SM validation data. Due to its non-destructive, cheap and low power setup, GPS sensor networks could also be used for potential applications in remote areas, aiming to serve as satellite validation data and to support the fields of agriculture, water supply, flood forecasting and climate change.

  8. Application of GPS in a high precision engineering survey network

    International Nuclear Information System (INIS)

    Ruland, R.; Leick, A.

    1985-04-01

    A GPS satellite survey was carried out with the Macrometer to support construction at the Stanford Linear Accelerator Center (SLAC). The network consists of 16 stations of which 9 stations were part of the Macrometer network. The horizontal and vertical accuracy of the GPS survey is estimated to be 1 to 2 mm and 2 to 3 mm respectively. The horizontal accuracy of the terrestrial survey, consisting of angles and distances, equals that of the GPS survey only in the ''loop'' portion of the network. All stations are part of a precise level network. The ellipsoidal heights obtained from the GPS survey and the orthometric heights of the level network are used to compute geoid undulations. A geoid profile along the linac was computed by the National Geodetic Survey in 1963. This profile agreed with the observed geoid within the standard deviation of the GPS survey. Angles and distances were adjusted together (TERRA), and all terrestrial observations were combined with the GPS vector observations in a combination adjustment (COMB). A comparison of COMB and TERRA revealed systematic errors in the terrestrial solution. A scale factor of 1.5 ppM +- .8 ppM was estimated. This value is of the same magnitude as the over-all horizontal accuracy of both networks. 10 refs., 3 figs., 5 tabs

  9. Kinematic GPS survey as validation of LIDAR strips accuracy

    Directory of Open Access Journals (Sweden)

    C. Gordini

    2006-06-01

    Full Text Available As a result of the catastrophic hydrogeological events which occurred in May 1998 in Campania, in the south of Italy, the distinctive features of airborne laser scanning mounted on a helicopter were used to survey the landslides at Sarno and Quindici. In order to survey the entire zone of interest, approximately 21 km2, it was necessary to scan 12 laser strips. Many problems arose during the survey: difficulties in receiving the GPS signal, complex terrain features and unfavorable atmospheric conditions. These problems were investigated and it emerged that one of the most influential factors is the quality of GPS signals. By analysing the original GPS data, the traces obtained by fixing phase ambiguity with an On The Fly (OTF algorithm were isolated from those with smoothed differential GPS solution (DGPS. Processing and analysis of laser data showed that not all the overlapping laser strips were congruent with each other. Since an external survey to verify the laser data accuracy was necessary, it was decided to utilize the kinematic GPS technique. The laser strips were subsequently adjusted, using the kinematic GPS data as reference points. Bearing in mind that in mountainous areas like the one studied here it is not possible to obtain nominal precision and accuracy, a good result was nevertheless obtained with a Digital Terrain Model (DTM of all the zones of interest.

  10. Studying Landslide Displacements in Megamendung (Indonesia Using GPS Survey Method

    Directory of Open Access Journals (Sweden)

    Hasanuddin Z. Abidin

    2004-11-01

    Full Text Available Landslide is one of prominent geohazards that frequently affects Indonesia, especially in the rainy season. It destroys not only environment and property, but usually also causes deaths. Landslide monitoring is therefore very crucial and should be continuously done. One of the methods that can have a contribution in studying landslide phenomena is repeated GPS survey method. This paper presents and discusses the operational performances, constraints and results of GPS surveys conducted in a well known landslide prone area in West Java (Indonesia, namely Megamendung, the hilly region close to Bogor. Three GPS surveys involving 8 GPS points have been conducted, namely on April 2002, May 2003 and May 2004, respectively. The estimated landslide displacements in the area are relatively quite large in the level of a few dm to a few m. Displacements up to about 2-3 m were detected in the April 2002 to May 2003 period, and up to about 3-4 dm in the May 2003 to May 2004 period. In both periods, landslides in general show the northwest direction of displacements. Displacements vary both spatially and temporally. This study also suggested that in order to conclude the existence of real and significant displacements of GPS points, the GPS estimated displacements should be subjected to three types of testing namely: the congruency test on spatial displacements, testing on the agreement between the horizontal distance changes with the predicted direction of landslide displacement, and testing on the consistency of displacement directions on two consecutive periods.

  11. Development of GPS data remote retrieval system using wireless LAN

    Directory of Open Access Journals (Sweden)

    Koichiro Doi

    2012-11-01

    Full Text Available A remote retrieval system, using a wireless LAN, was developed to retrieve dual-frequency GPS data. The system consists of a ground observation unit (comprising a dual-frequency GPS logger and a data transmission unit and a data retrieval unit. In this system, we use the ZigBee communication protocol to transmit control commands (2.4 GHz, 250 Kbps and a wireless LAN communication to transmit GPS data (2.4 GHz, 54 Mbps. Data of every 30 seconds to transmit to the data retrieval unit are re-sampled from 1-second data at 00 UT each day. We conducted three data-transmission tests with the system: (1 a ground data retrieval test, (2 a data retrieval test from the atmosphere of a few hundred meters high using a small unmanned aircraft, and (3 actual GPS-data retrieval tests from a GPS buoy deployed on sea ice at Nisi-no-ura Cove, Syowa Station, Antarctica. In test (1, we successfully received all the data from the ground observation unit when situated at distances of less than 400 m from the data retrieval unit. In test (2, we obtained approximately 24.5 MB of data from the aircraft at heights of less than 250 m. In test (3, we obtained approximately 23.5 MB of data from the GPS buoy within 10 minutes. The proposed system has the advantage of enabling continuous measurements without aborting the measurement at the data retrievals.

  12. The Volpe Center GPS Adjacent Band Compatibility Program Plan : GPS Adjacent Band Compatibility Workshop, Volpe Center, Cambridge MA

    Science.gov (United States)

    2014-09-18

    Approach to DOT GPS Adjacent Band Compatibility Assessment. Identify forums and provide public outreach to make sure the progress and work are as open and transparent as possible. Develop an implementation plan that incorporates aspects from the DOT ...

  13. Resultados obtenidos en pacientes con dolor sometidos a tratamiento

    Directory of Open Access Journals (Sweden)

    Fe Boch Valdés

    2001-04-01

    Full Text Available El dolor tiene una proyección biopsicosocial, síntoma por el que gran número de pacientes son atendidos, requiere de visión multidimensional, por lo que origina los grupos multidisciplinarios y las Clínicas del Dolor. El aumento en la toxicidad medicamentosa y otras técnicas invasivas, que no siempre producen alivio, ha incrementado el uso de terapias naturales y biológicas. En este estudio se recogen resultados de tratamientos naturales y convencionales utilizados en un período de 5 años. Se estudiaron 9 280 pacientes con dolor, a los que se aplicaron las técnicas de electroacupuntura, acupuntura, láser, estimulación eléctrica nerviosa transcutánea (TENS, faciocibernetoterapia (FACI, moxibustión, auriculoterapia, técnicas psicológicas, homeopatía, masajes, magnetoterapia y fitoterapia. Las variables de respuesta al tratamiento fueron consideradas por escala análoga visual a la 5ta y 10ma sesión. Encontramos que las lumbalgias fueron más frecuentes, y la electroacupuntura y la acupuntura las técnicas más efectivas. Los métodos naturales utilizados fueron eficaces, económicos y útiles en el tratamiento del dolor.Pain has a biopsychosocial projection and many patients receive attention because of this symptom, which requires a multidimensional vision that gives rise to the multidisciplinary groups and to the Pain Clinic. The increase in drug toxicity and other invasive techniques that not always cause relief have promoted the use of natural and biologic therapies. In the present study, the results of natural and conventional treatments used for 5 years were collected. A total of 9 280 patients with pain were studied. Electroacupuncture, acupuncture, laser, transcutaneous nerve electric stimulation, phaciocybernetic therapy (PHACI, moxibustion, auricle therapy, psychologic techniques, homeopathy, massages, magnetotherapy and phytotherapy were applied. Variables of response to treatment were considered by visual analogue

  14. Development of position measuring technology by GPS; GPS ni yoru sokui gijutsu no kaihatsu

    Energy Technology Data Exchange (ETDEWEB)

    Ishizaki, T [Ministry of Transportation, Tokyo (Japan)

    1994-07-25

    With regard to the GPS (global positioning system) which uses the satellites launched and administered by the U.S.A. and has been utilized worldwide for ships, automobiles and geodetic surveys in recent years, Ministry of Transport started investigation and research on the application of its position measuring system from FY 1989. In this fiscal year, a study on position measuring methods and selection of the position measuring system to be developed were made, in FY 1991, the real-time functioning and track display were developed, in FY 1992, the initialization aboard the ship, the measure to prevent cycle slip, and the radio data communication technology were developed, and in FY 1993, a long term demonstration experiment presuming its practical use was conducted attaining the expected purpose. In this article, the developed real-time kinematic position measuring system is introduced. Regarding the position measuring methods by the GPS, there are the one point position measuring method and the relative position measuring method. Regarding this newly developed position measuring device, its application to work ships and structures can be considered in various ways. 4 figs.

  15. Supervivencia en pacientes con tuberculosis infectados por VIH. Estudio de los fallecimientos en los primeros nueve meses

    Directory of Open Access Journals (Sweden)

    Falqués Casanovas Meritxell

    1999-01-01

    Full Text Available FUNDAMENTO: En las personas con tuberculosis infectadas por el VIH, se ha observado una elevada letalidad durante las primeras semanas desde el inicio de la terapia antituberculosa. En el presente estudio se analiza la supervivencia de las mismas en el marco de un estudio de cohortes retrospectivo. MÉTODOS: Se incluyeron 1.135 individuos que correspondían a aquellos por el VIH mayores de quince años y residentes en Barcelona, registrados por el Programa de Prevención y Control de la Tuberculosis de Barcelona y que fueron diagnosticados entre 1988 y 1993. Las variables analizadas fueron edad, sexo, antecedentes de prisión, distrito municipal, grupo de riesgo, porcentaje de linfocitos T CD4+, prueba de la tuberculina, diagnóstico de sida (según criterio CDC-1987, patrón radiológico, bacteriología y localización anatómica de la tuberculosis. Se utilizó el método semiparamétrico de Cox, las curvas de Kaplan-Meier y la prueba de log-rank. RESULTADOS: La probabilidad de supervivencia a los nueve meses fue del 77%, con amplias variaciones en los diversos subgrupos. Las únicas variables significativas en el modelo multivariado de Cox fueron sida, porcentaje de linfocitos T CD4+ y su interacción. El riesgo de morir para un individuo sin SIDA y porcentaje de linfocitos T CD4+ inferior o igual al 14% fue 7.69 veces mayor que el riesgo de morir para un individuo sin SIDA y porcentaje de linfocitos T CD4+ superior al 14%. CONCLUSIONES: La supervivencia en las personas con tuberculosis infectadas por VIH es muy variable. Las que fallecieron a corto plazo fueron las diagnosticadas de sida al iniciar el tratamiento antituberculoso y que, además, tenían un porcentaje de linfocitos T CD4+ inferior o igual al 14%.

  16. GPs should evaluate all children following UTI.

    Science.gov (United States)

    Hutchings, Frances; Jadresić, Lyda

    2010-01-01

    Ten per cent of girls and 3% of boys will have had a UTI by 16 years of age. The majority are acute, isolated illnesses that resolve quickly, with no long-term implications for the patient. However, UTIs may be associated with underlying congenital abnormalities, and recurrent infections can lead to renal scarring. UTI is defined as bacteriuria in the presence of symptoms. Asymptomatic bacteriuria does not require treatment or investigation. The presentation of UTI is extremely variable. The only way to differentiate a UTI from a viral infection is by testing the urine and this should be carried out within 24 hours in children with non-specific fever. UTIs can also present with vomiting, failure to thrive or persistent irritability. A urine infection in the presence of any of the above symptoms is a pyelonephritis (upper UTI). Children may also present with classical symptoms of cystitis (lower UTI) such as urinary frequency, dysuria and abdominal pain. Most children with UTI, even if febrile, can be managed in the community. If the initial assessment shows a high risk of serious illness, there should be an urgent referral to a paediatrician. The same applies to infants under three months with suspected UTI. It is better to obtain a urine sample by the clean catch method, rather than using urine pads or bags. Leucocyte esterase and nitrite dipsticks are not reliable in children under three, so a negative dipstick does not rule out UTI. Not every child needs to be referred after a first UTI. However, they should all be evaluated to help determine which require renal imaging as well as identifying triggers for recurrence. GPs are central to the identification of children at risk of renal pathology. All children who are diagnosed and treated for a UTI must be assessed for risk of renal abnormalities and/or recurrence.

  17. Báez, Fernando (2013, Los primeros libros de la Humanidad: el mundo antes de la imprenta y el libro electrónico

    Directory of Open Access Journals (Sweden)

    Paula Sequeiros

    2014-05-01

    Full Text Available Los primeros libros de la Humanidad: el mundo antes de la imprenta y el libro electrónico, de Fernando Báez, lançado no final de 2013 pela editora Fórcola no Estado espanhol, é a mais recente monografia do autor dedicado ao combate à destruição de bibliotecas históricas e livros raros, parte do património bibliográfico mundial. Nascido na Venezuela em 1963, licenciado em História e doutorado em Ciências da Informação e Bibliotecas, Báez ganha particular notoriedade internacional com a Históri...

  18. Movilización y activismo por la defensa de los presos políticos durante los primeros setenta en Argentina: actores, tramas y estrategias

    OpenAIRE

    Chama, Mauricio Sergio

    2016-01-01

    La ponencia se propone abordar la experiencia de movilización y activación en favor de los presos políticos durante los primeros años de la década de los setenta en Argentina. En ese tramo histórico emergió un amplio abanico de núcleos y espacios asociativos que, más allá de sus diferencias, definieron como horizonte compartido la defensa y solidaridad con las presos/as políticos. Particularmente, la ponencia focaliza su atención en el proceso de construcción de la denuncia pública llevada ad...

  19. Uso de guías didácticas en el Taller de Primeros Auxilios para Enfermería.

    Directory of Open Access Journals (Sweden)

    Derby Muñoz Rojas

    2011-04-01

    Full Text Available This study aimed to determine the feasibility of using tutorials on course work: EE-0220 Taller de Primeros Auxilios from the nursing program at the University of Costa Rica, which were implemented during the second cycle school in 2008. Purpose: The investigation determined the perception of the students on the usefulness of the ?Guías Didácticas? as a tool to facilitate the process of learning of first aid. Methodology: Was an educational research, type of classroom action research. Instruments and techniques: to collect the information used a brainstorming and a questionnaire a population to 18 students. Result: the study can conclude that it was found advantageous to use the guides as they contributed to the assimilation of the contents by the students. In conclusion it is said that successful teaching strategies used allow the students use their participation in the teaching-learning process.

  20. El origen de la mujer cuidadora: apuntes para el análisis hermenéutico de los primeros testimonios

    Directory of Open Access Journals (Sweden)

    M.ª Carmen Fernández Tijero

    Full Text Available El objetivo principal de este trabajo es analizar los testimonios primigenios del trabajo de la mujer cuidadora para comprender mejor su significado actual. Se ha llevado a cabo primero una búsqueda de testimonios de diversos tipos y después se intenta dar una interpretación por medio de la hermenéutica. Llegamos así a la comprensión del valor de la mujer en el ámbito de la medicina desde la antigüedad, concluyendo además la estrecha relación que guarda el arte de la curación con la naturaleza femenina, representado ya en su símbolo.

  1. Agriculturization within a new rurality context: New pluriactive actors in the department of Río Primero in the province of Córdoba

    Directory of Open Access Journals (Sweden)

    Gabriel Orlando Coppi

    2010-01-01

    Full Text Available During the past decades, Argentina has shown evidence of a steady agriculturization process. The department of Río Primero, in the province of Córdoba, is part of a clear dynamics within a large part of the Pampas region. The area studied displays profound productive, economic and social transformations. In this context, the most vulnerable within the structure are left out of the production system. However, small urban producers have recently appearedin the scene, and in apparent contradiction, have begun complementing their urban incomes with those from agricultural activities. In this paper, we deal with the start of agricultural activities of the new urban pluriactive actors, their reasons to begin these activities, their productionmodes and adaptation strategies, their paths in life and the rural links they may have in their family histories, taking into account what role inheritance and/or the assignment of lands play a role within that income.

  2. Comparación de patrones de alimentación en estudiantes del primero y quinto años de la Escuela de Medicina de la Universidad de Cuenca, 2006

    OpenAIRE

    Cordero Gulá, Luis Pablo

    2007-01-01

    Fueron seleccionados aleatoriarmente el 62 por ciento de estudiantes de primero a quinto cursos de la Escuela de Medicina de la Universidad de Cuenca, 2006 (158 y 99 respectivamente; 257 en total) a ellos de les aplicó una encuesta sobre hábitos alimentarios, por recordatorio de semana anterior; y se registraron sus medidas antropométricas. El análisis estadístico de la encuesta muestra que no hay diferencias significativas entre los estudiantes de primero y quinto cursos, tampoco se encuent...

  3. Status of Precise Orbit Determination for Jason-2 Using GPS

    Science.gov (United States)

    Melachroinos, S.; Lemoine, F. G.; Zelensky, N. P.; Rowlands, D. D.; Pavlis, D. E.

    2011-01-01

    The JASON-2 satellite, launched in June 2008, is the latest follow-on to the successful TOPEX/Poseidon (T/P) and JASON-I altimetry missions. JASON-2 is equipped with a TRSR Blackjack GPS dual-frequency receiver, a laser retroreflector array, and a DORIS receiver for precise orbit determination (POD). The most recent time series of orbits computed at NASA GSFC, based on SLR/DORIS data have been completed using both ITRF2005 and ITRF2008. These orbits have been shown to agree radially at 1 cm RMS for dynamic vs SLRlDORIS reduced-dynamic orbits and in comparison with orbits produced by other analysis centers (Lemoine et al., 2010; Zelensky et al., 2010; Cerri et al., 2010). We have recently upgraded the GEODYN software to implement model improvements for GPS processing. We describe the implementation of IGS standards to the Jason2 GEODYN GPS processing, and other dynamical and measurement model improvements. Our GPS-only JASON-2 orbit accuracy is assessed using a number of tests including analysis of independent SLR and altimeter crossover residuals, orbit overlap differences, and direct comparison to orbits generated at GSFC using SLR and DORIS tracking, and to orbits generated externally at other centers. Tests based on SLR and the altimeter crossover residuals provide the best performance indicator for independent validation of the NASAlGSFC GPS-only reduced dynamic orbits. For the ITRF2005 and ITRF2008 implementation of our GPS-only obits we are using the IGS05 and IGS08 standards. Reduced dynamic versus dynamic orbit differences are used to characterize the remaining force model error and TRF instability. We evaluate the GPS vs SLR & DORIS orbits produced using the GEODYN software and assess in particular their consistency radially and the stability of the altimeter satellite reference frame in the Z direction for both ITRF2005 and ITRF2008 as a proxy to assess the consistency of the reference frame for altimeter satellite POD.

  4. Integrating GIS and GPS in environmental remediation oversight

    International Nuclear Information System (INIS)

    Kaletsky, K.; Earle, J.R.; Schneider, T.A.

    1996-01-01

    This paper presents findings on Ohio EPA Office of Federal Facilities Oversight's (OFFO) use of GIS and GPS for environmental remediation oversight at the U.S. Department of Energy's (DOE) Fernald Site. The Fernald site is a former uranium metal production facility within DOE's nuclear weapons complex. Significant uranium contamination of soil and groundwater is being remediated under state and federal regulations. OFFO uses GIS/GPS to enhance environmental monitoring and remediation oversight. These technologies are utilized within OFFO's environmental monitoring program for sample location and parameter selection, data interpretation and presentation. GPS is used to integrate sample data into OFFO's GIS and for permanently linking precise and accurate geographic data to samples and waste units. It is important to identify contamination geographically as all visual references (e.g., buildings, infrastructure) will be removed during remediation. Availability of the GIS allows OFFO to perform independent analysis and review of DOE contractor generated data, models, maps, and designs. This ability helps alleviate concerns associated with open-quotes black boxclose quotes models and data interpretation. OFFO's independent analysis has increased regulatory confidence and the efficiency of design reviews. GIS/GPS technology allows OFFO to record and present complex data in a visual format aiding in stakeholder education and awareness. Presented are OFFO's achievements within the aforementioned activities and some reasons learned in implementing the GIS/GPS program. OFFO's two years of GIS/GPS development have resulted in numerous lessons learned and ideas for increasing effectiveness through the use of GIS/GPS

  5. Climatology of GPS signal loss observed by Swarm satellites

    Directory of Open Access Journals (Sweden)

    C. Xiong

    2018-04-01

    Full Text Available By using 3-year global positioning system (GPS measurements from December 2013 to November 2016, we provide in this study a detailed survey on the climatology of the GPS signal loss of Swarm onboard receivers. Our results show that the GPS signal losses prefer to occur at both low latitudes between ±5 and ±20° magnetic latitude (MLAT and high latitudes above 60° MLAT in both hemispheres. These events at all latitudes are observed mainly during equinoxes and December solstice months, while totally absent during June solstice months. At low latitudes the GPS signal losses are caused by the equatorial plasma irregularities shortly after sunset, and at high latitude they are also highly related to the large density gradients associated with ionospheric irregularities. Additionally, the high-latitude events are more often observed in the Southern Hemisphere, occurring mainly at the cusp region and along nightside auroral latitudes. The signal losses mainly happen for those GPS rays with elevation angles less than 20°, and more commonly occur when the line of sight between GPS and Swarm satellites is aligned with the shell structure of plasma irregularities. Our results also confirm that the capability of the Swarm receiver has been improved after the bandwidth of the phase-locked loop (PLL widened, but the updates cannot radically avoid the interruption in tracking GPS satellites caused by the ionospheric plasma irregularities. Additionally, after the PLL bandwidth increased larger than 0.5 Hz, some unexpected signal losses are observed even at middle latitudes, which are not related to the ionospheric plasma irregularities. Our results suggest that rather than 1.0 Hz, a PLL bandwidth of 0.5 Hz is a more suitable value for the Swarm receiver.

  6. Climatology of GPS signal loss observed by Swarm satellites

    Science.gov (United States)

    Xiong, Chao; Stolle, Claudia; Park, Jaeheung

    2018-04-01

    By using 3-year global positioning system (GPS) measurements from December 2013 to November 2016, we provide in this study a detailed survey on the climatology of the GPS signal loss of Swarm onboard receivers. Our results show that the GPS signal losses prefer to occur at both low latitudes between ±5 and ±20° magnetic latitude (MLAT) and high latitudes above 60° MLAT in both hemispheres. These events at all latitudes are observed mainly during equinoxes and December solstice months, while totally absent during June solstice months. At low latitudes the GPS signal losses are caused by the equatorial plasma irregularities shortly after sunset, and at high latitude they are also highly related to the large density gradients associated with ionospheric irregularities. Additionally, the high-latitude events are more often observed in the Southern Hemisphere, occurring mainly at the cusp region and along nightside auroral latitudes. The signal losses mainly happen for those GPS rays with elevation angles less than 20°, and more commonly occur when the line of sight between GPS and Swarm satellites is aligned with the shell structure of plasma irregularities. Our results also confirm that the capability of the Swarm receiver has been improved after the bandwidth of the phase-locked loop (PLL) widened, but the updates cannot radically avoid the interruption in tracking GPS satellites caused by the ionospheric plasma irregularities. Additionally, after the PLL bandwidth increased larger than 0.5 Hz, some unexpected signal losses are observed even at middle latitudes, which are not related to the ionospheric plasma irregularities. Our results suggest that rather than 1.0 Hz, a PLL bandwidth of 0.5 Hz is a more suitable value for the Swarm receiver.

  7. Assessment of 3D hydrologic deformation using GRACE and GPS

    Science.gov (United States)

    Watson, C. S.; Tregoning, P.; Fleming, K.; Burgette, R. J.; Featherstone, W. E.; Awange, J.; Kuhn, M.; Ramillien, G.

    2009-12-01

    Hydrological processes cause variations in gravitational potential and surface deformations, both of which are detectable with ever increasing precision using space geodetic techniques. By comparing the elastic deformation computed from continental water load estimates derived from the Gravity Recovery and Climate Experiment (GRACE), with three-dimensional surface deformation derived from GPS observations, there is clear potential to better understand global to regional hydrological processes, in addition to acquiring further insight into the systematic error contributions affecting each space geodetic technique. In this study, we compare elastic deformation derived from water load estimates taken from the CNES, CSR, GFZ and JPL time variable GRACE fields. We compare these surface displacements with those derived at a global network of GPS sites that have been homogeneously reprocessed in the GAMIT/GLOBK suite. We extend our comparison to include a series of different GPS solutions, with each solution only subtly different based on the methodology used to down weight the height component in realizing site coordinates on the terrestrial reference frame. Each of the GPS solutions incorporate modeling of atmospheric loading and utilization of the VMF1 and a priori zenith hydrostatic delays derived via ray tracing through ECMWF meteorological fields. The agreement between GRACE and GPS derived deformations is not limited to the vertical component, with excellent agreement in the horizontal component across areas where large hydrologic signals occur over broad spatial scales (with correlation in horizontal components as high as 0.9). Agreement is also observed at smaller scales, including across Europe. These comparisons assist in understanding the magnitude of current error contributions within both space geodetic techniques. With the emergence of homogeneously reprocessed GPS time series spanning the GRACE mission, this technique offers one possible means of

  8. Earth tide effects on kinematic/static GPS positioning in Denmark and Greenland

    DEFF Research Database (Denmark)

    Xu, G.C.; Knudsen, Per

    2000-01-01

    A detailed Study of the Earth tide effects on the GPS kinematic/static positioning is presented in this paper by using theoretical Earth tide computation and practical GPS data processing. Tidal effects could reach up to 30 cm in Denmark and Greenland depending on the measuring time...... and the position of reference station. With a baseline less than 80 km, the difference of the Earth tide effects could reach more than 5 mm. So, in precise applications of GPS positioning, the Earth tide effect has to be taken into account even for a relative small local GPS network. Several examples are given...... for demonstrating that the Earth tide effects can be viewed by GPS surveying. They are given through static GPS data static processing, static GPS data kinematic processing, and airborne kinematic GPS data processing. In these cases, the Earth tide effects can be subtracted from the GPS results. The determination...

  9. The use of civilian-type GPS receivers by the military and their vulnerability to jamming

    Directory of Open Access Journals (Sweden)

    Ludwig Combrinck

    2012-05-01

    Full Text Available We considered the impact of external influences on a GPS receiver and how these influences affect the capabilities of civilian-type GPS receivers. A standard commercial radio frequency signal generator and passive GPS antenna were used to test the sensitivity of GPS to intentional jamming; the possible effects of the terrain on the propagation of the jamming signal were also tested. It was found that the high sensitivity of GPS receivers and the low strength level of GPS satellite signals combine to make GPS receivers very vulnerable to intentional jamming or unintentional radio frequency interference. Terrain undulation was used to shield GPS antennas from the direct line-of-sight of the jamming antenna and this indicated that terrain characteristics can be used to mitigate the effects of jamming. These results illuminate the vulnerability of civilian-type GPS receivers to the possibility and the ease of disablement and establish the foundation for future work.

  10. GPS Time Synchronization in School-Network Cosmic Ray Detectors

    Science.gov (United States)

    Berns, H.-G.; Burnett, T. H.; Gran, R.; Wilkes, R. J.

    2004-06-01

    The QuarkNet DAQ card for school-network cosmic ray detectors provides a low-cost alternative to using standard particle and nuclear physics fast pulse electronics modules. The board, which can be produced at a cost of less than $500.00 (USD), produces trigger time and pulse edge time data for 2- to 4-fold coincidence levels via a universal RS232 serial port interface, usable with any PC. Individual detector stations, each consisting of four scintillation counter modules, front-end electronics, and a GPS receiver, produce a stream of data in form of ASCII text strings in identifiable set of formats for different functions. The card includes a low-cost GPS receiver module, which permits time-stamping event triggers to about 50 nanosecond accuracy in UTC between widely separated sites. The technique used for obtaining precise GPS time employs the 1PPS signal, which is not normally available to users of the commercial GPS module. We had the stock model slightly custom-modified to access this signal. The method for deriving time values was adapted from methods developed for the K2K long-baseline neutrino experiment. Performance of the low-cost GPS module used is compared to that of a more expensive unit with known quality.

  11. Ethics support for GPs: what should it look like?

    Science.gov (United States)

    Clark-Grill, Monika

    2016-03-01

    INTRODUCTION Ethics support services for hospital clinicians have become increasingly common globally but not as yet in New Zealand. However, an initiative to change this is gathering momentum. Its slogan 'Clinical ethics is everyone's business' indicates that the aim is to encompass all of health care, not just the hospital sector. General Practitioners (GPs) deal with ethical issues on a daily basis. These issues are often quite different from ethical issues in hospitals. To make future ethics support relevant for primary care, local GPs were interviewed to find out how they might envisage ethics support services that could be useful to them. METHODS A focus group interview with six GPs and semi-structured individual interviews with three GPs were conducted. Questions included how they made decisions on ethical issues at present, what they perceived as obstacles to ethical reflection and decision-making, and what support might be helpful. FINDINGS Three areas of ethics support were considered potentially useful: Formal ethics education during GP training, access to an ethicist for assistance with analysing an ethical issue, and professional guidance with structured ethics conversations in peer groups. CONCLUSION The complex nature of general practice requires GPs to be well educated and supported for handling ethical issues. The findings from this study could serve as input to the development of ethics support services. KEYWORDS General practice; primary care; ethics; support; education.

  12. GPS Technology and Human Psychological Research: A Methodological Proposal

    Directory of Open Access Journals (Sweden)

    Pedro S. A. Wolf

    2010-10-01

    Full Text Available Animal behaviorists have made extensive use of GPS technology since 1991. In contrast, psychological research has made little use of the technology, even though the technology is relatively inexpensive, familiar, and widespread. Hence, its potential for pure and applied psychological research remains untapped. We describe three methods psychologists could apply to individual differences research, clinical research, or spatial use research. In the context of individual differences research, GPS technology permits us to test hypotheses predicting specific relations among patterns of spatial use and individual differences variables. In a clinical context, GPS technology provides outcome measures that may relate to the outcome of interventions designed to treat psychological disorders that, for example, may leave a person homebound (e.g. Agoraphobia, PTSD, TBI. Finally, GPS technology provides natural measures of spatial use. We, for example, used GPS technology to quantify traffic flow and exhibit use at the Arizona Sonora Desert Museum. Interested parties could easily extend this methodology some aspects of urban planning or business usage.DOI: 10.2458/azu_jmmss.v1i1.74

  13. Processing horizontal networks measured by integrated terrestrial and GPS technologies

    Directory of Open Access Journals (Sweden)

    Vincent Jakub

    2003-09-01

    Full Text Available Local horizontal networks in which GPS and terrestrial measurements (TER are done are often established at present. Iin other networks, the previous terrestrial measurements can be completed with quantities from contemporary GPS observations (tunnel nets, mining nets with surface and underground parts and other long-shaped nets.The processing of such heterobeneous (GPS, TER networks whose terrestrial measurements are performed as point coordinate measurements (∆X, ∆Y using (geodetic total stationIn is presented in this paper. In such network structures it is then available:- the values ∆X, ∆Y from TER observations which are transformed in the plane of S-JTSK for adjustement,- the values ∆X, ∆Y in the plane S-JTSK that can be obtained by 3D transformation of WGS84 netpoint coordinates from GPS observations to corresponding coordinates S-JTSK.For common adjusting all the ∆X, ∆Y, some elements of the network geometry (e.g. distances should be measured by both methods (GPS, TER. This approach makes possible an effective homogenisation of both network parts what is equivalent to saying that an expressive influence reduction on local frame realizations of S-JTSK in the whole network can be made.Results of network processing obtained in proposed manner are acceptable in general and they are equivalent (accuracy, reliability to results of another processing methods.

  14. Design about position and display of GPS based on singlechip

    Directory of Open Access Journals (Sweden)

    WU Dongdong

    2016-02-01

    Full Text Available GPS is used in ships,vehicles,aircraft and other moving objects.GPS also has the important application in vehicle monitoring system.However,with the expansion of the specialized functions of GPS,its high cost makes so many ordinary consumers unbearable.This paper proposes a simple design of GPS based on singlechip.The design Improves the basic utility functions of system and adds the speed and mileage measurement.GPS module uses the differential technology to improve the positioning accuracy.Therefore,the navigation device is compact,easy to carry and of high precision positioning.Through getting the data of 3D coordinates from the observation point and the factor of position accuracy,the average of which is less than five,indicating that the position accuracy can be improved by differential technology to achieve the desired range.At last,the feasibility of this design is verified through the current data tested in the outdoors.

  15. GPS water level measurements for Indonesia's Tsunami Early Warning System

    Directory of Open Access Journals (Sweden)

    T. Schöne

    2011-03-01

    Full Text Available On Boxing Day 2004, a severe tsunami was generated by a strong earthquake in Northern Sumatra causing a large number of casualties. At this time, neither an offshore buoy network was in place to measure tsunami waves, nor a system to disseminate tsunami warnings to local governmental entities. Since then, buoys have been developed by Indonesia and Germany, complemented by NOAA's Deep-ocean Assessment and Reporting of Tsunamis (DART buoys, and have been moored offshore Sumatra and Java. The suite of sensors for offshore tsunami detection in Indonesia has been advanced by adding GPS technology for water level measurements.

    The usage of GPS buoys in tsunami warning systems is a relatively new approach. The concept of the German Indonesian Tsunami Early Warning System (GITEWS (Rudloff et al., 2009 combines GPS technology and ocean bottom pressure (OBP measurements. Especially for near-field installations where the seismic noise may deteriorate the OBP data, GPS-derived sea level heights provide additional information.

    The GPS buoy technology is precise enough to detect medium to large tsunamis of amplitudes larger than 10 cm. The analysis presented here suggests that for about 68% of the time, tsunamis larger than 5 cm may be detectable.

  16. Comparação de três receptores GPS para uso em agricultura de precisão Comparison of three GPS receiver for precision agriculture uses

    Directory of Open Access Journals (Sweden)

    Marcelo C. C. Stabile

    2006-04-01

    Full Text Available Diversos equipamentos que se utilizam dos sinais transmitidos pelo Sistema de Posicionamento Global (GPS têm sido empregados na Agricultura de Precisão. Neste estudo, foi feita uma comparação de três receptores comerciais no intuito de verificar suas acurácias. As principais qualidades medidas foram a repetibilidade dos dados e a estabilidade do sistema. O estudo foi conduzido em campo aberto, na área experimental da ESALQ/USP, com três linhas paralelas de 50 m espaçadas 10 m entre si. A coleta de dados foi feita no dia 25-9-2002, totalizando seis repetições da comparação dos três sistemas. Os dados foram coletados simultaneamente, de acordo com a melhor configuração da constelação de satélites, sendo que os três sistemas apresentaram resultados distintos. O GPS "A" (oito canais, sem correção diferencial apresentou a maior variabilidade e a menor repetibilidade, com desvios de quase 10 m numa mesma linha. O sistema "B", com sinal de correção diferencial (DGPS "B", 12 canais, apresentou acurácia superior ao "A", com desvios de, no máximo, 6 m, mas com repetibilidade significativa. O GPS "C" (12 canais, com algoritmo otimizado apresentou a maior acurácia e desvio máximo de 2 m. Assim, os dois últimos sistemas são adequados para a aplicação dos conceitos da Agricultura de Precisão.Several brands of equipment have been used with global positioning systems (GPS in Precision Agriculture. The quality of these different receivers varies according to their capabilities in terms of accuracy and repeatability. In this study, three commercial systems were tested to compare their accuracies. This study focused on measuring the stability of the receiver and the repeatability of data. The study was conducted in the experimental area of ESALQ/USP. It consisted of three parallel 50-meter lines spaced 10 meters apart. Data collection was done on 9-25-2002 with a total of six replications. Data was collected simultaneously and the

  17. Las becas 6000 a examen. Resultados, prácticas, expectativas y oportunidades escolares de familias y estudiantes incluidos en el programa

    Directory of Open Access Journals (Sweden)

    Río Ruiz, Manuel Ángel

    2014-12-01

    Full Text Available This article analyzes a cash-transfer program conditioned to school performance focused on low-income students involved in non-mandatory secondary education: Becas 6000 in Andalusia, Spain. Administrative data on the fellows’ achievement are examined and a qualitative research strategy is used to analyze the grant’s effects on the schooling strategies, practices and expectations of recipients and their families. Several findings are worth noting. First, the number of fellows who reach academic requirements to receive the grant increases. Second, the incentive at stake produces different results in the efforts of various kinds of students: while those with the highest and the lowest levels of attainment before receiving the grant barely modify their efforts and scholar commitment, middle-range students increase their performance. Third, unexpected positive effects are observed, such as the solidification of future educational opportunities for students who ultimately receive the grant.Este artículo analiza una política de transferencias de rentas condicionadas a resultados educativos entre estudiantes de secundaria postobligatoria de escasos recursos: las becas 6000 en Andalucía. Se examinan, mediante una revisión de datos administrativos, los resultados escolares del alumnado incluido en el programa. Mediante una estrategia cualitativa, se analizan los efectos de la beca en las estrategias, prácticas y expectativas escolares de diferentes perfiles de becarios y de sus familias. Varios resultados destacan. Primero, aumento del alumnado becado que supera los requisitos académicos exigidos para cobrar la beca. Segundo, existencia de efectos diversos del incentivo en juego en los esfuerzos estudiantiles: mientras que los estudiantes de más alto y de más bajo rendimiento antes de convertirse en becarios apenas modificarían su grado de esfuerzo y compromiso escolar, sí se multiplica entre un importante sector de estudiantes de nivel

  18. Global GPS Ionospheric Modelling Using Spherical Harmonic Expansion Approach

    Directory of Open Access Journals (Sweden)

    Byung-Kyu Choi

    2010-12-01

    Full Text Available In this study, we developed a global ionosphere model based on measurements from a worldwide network of global positioning system (GPS. The total number of the international GPS reference stations for development of ionospheric model is about 100 and the spherical harmonic expansion approach as a mathematical method was used. In order to produce the ionospheric total electron content (TEC based on grid form, we defined spatial resolution of 2.0 degree and 5.0 degree in latitude and longitude, respectively. Two-dimensional TEC maps were constructed within the interval of one hour, and have a high temporal resolution compared to global ionosphere maps which are produced by several analysis centers. As a result, we could detect the sudden increase of TEC by processing GPS observables on 29 October, 2003 when the massive solar flare took place.

  19. How GPs implement clinical guidelines in everyday clinical practice

    DEFF Research Database (Denmark)

    Videbæk Le, Jette; Hansen, Helle P; Riisgaard, Helle

    2015-01-01

    BACKGROUND: Clinical guidelines are considered to be essential for improving quality and safety of health care. However, interventions to promote implementation of guidelines have demonstrated only partial effectiveness and the reasons for this apparent failure are not yet fully understood....... OBJECTIVE: To investigate how GPs implement clinical guidelines in everyday clinical practice and how implementation approaches differ between practices. METHODS: Individual semi-structured open-ended interviews with seven GPs who were purposefully sampled with regard to gender, age and practice form....... Interviews were recorded, transcribed verbatim and then analysed using systematic text condensation. RESULTS: Analysis of the interviews revealed three different approaches to the implementation of guidelines in clinical practice. In some practices the GPs prioritized time and resources on collective...

  20. High accuracy autonomous navigation using the global positioning system (GPS)

    Science.gov (United States)

    Truong, Son H.; Hart, Roger C.; Shoan, Wendy C.; Wood, Terri; Long, Anne C.; Oza, Dipak H.; Lee, Taesul

    1997-01-01

    The application of global positioning system (GPS) technology to the improvement of the accuracy and economy of spacecraft navigation, is reported. High-accuracy autonomous navigation algorithms are currently being qualified in conjunction with the GPS attitude determination flyer (GADFLY) experiment for the small satellite technology initiative Lewis spacecraft. Preflight performance assessments indicated that these algorithms are able to provide a real time total position accuracy of better than 10 m and a velocity accuracy of better than 0.01 m/s, with selective availability at typical levels. It is expected that the position accuracy will be increased to 2 m if corrections are provided by the GPS wide area augmentation system.

  1. What keeps Melbourne GPs satisfied in their jobs?

    Science.gov (United States)

    Walker, Kate Anne; Pirotta, Marie

    2007-10-01

    Workforce shortages make it important to promote job satisfaction and career longevity in general practitioners. We aimed to investigate strategies that maintain and improve Melbourne (Victoria) GP job satisfaction. A postal survey of a random selection of The Royal Australian College of General Practitioners vocationally recognised GPs (N=860). Open ended answers were coded according to themes and compared between genders. Thirty-eight percent of surveyed GPs responded. The mean satisfaction score was 50 out of 70 (SD 9). Women GPs were more satisfied than men with life-work balance (pwork and intellectual stimulation. Strategies to improve GP satisfaction were increased pay, reduced paperwork, and improved administrative systems. General practitioners were satisfied with their jobs due to the intrinsic qualities of their work and workplace. Decreasing the administrative burden, increasing remuneration and improving practice supports may improve metropolitan GP job satisfaction.

  2. Accurate Localization of Communicant Vehicles using GPS and Vision Systems

    Directory of Open Access Journals (Sweden)

    Georges CHALLITA

    2009-07-01

    Full Text Available The new generation of ADAS systems based on cooperation between vehicles can offer serious perspectives to the road security. The inter-vehicle cooperation is made possible thanks to the revolution in the wireless mobile ad hoc network. In this paper, we will develop a system that will minimize the imprecision of the GPS used to car tracking, based on the data given by the GPS which means the coordinates and speed in addition to the use of the vision data that will be collected from the loading system in the vehicle (camera and processor. Localization information can be exchanged between the vehicles through a wireless communication device. The creation of the system must adopt the Monte Carlo Method or what we call a particle filter for the treatment of the GPS data and vision data. An experimental study of this system is performed on our fleet of experimental communicating vehicles.

  3. Mw 8.5 BENGKULU EARTHQUAKES FROM CONTINUOUS GPS DATA

    Directory of Open Access Journals (Sweden)

    W. A. W. Aris

    2016-09-01

    Full Text Available The Mw 8.5 Bengkulu earthquake of 30 September 2007 and the Mw8.6 28 March 2005 are considered amongst large earthquake ever recorded in Southeast Asia. The impact into tectonic deformation was recorded by a network of Global Positioning System (GPS Continuously Operating Reference Station (CORS within southern of Sumatra and west-coast of Peninsular Malaysia. The GPS data from the GPS CORS network has been deployed to investigate the characteristic of postseismic deformation due to the earthquakes. Analytical logarithmic and exponential function was applied to investigate the deformation decay period of postseismic deformation. This investigation provides a preliminary insight into postseismic cycle along the Sumatra subduction zone in particular and on the dynamics Peninsular Malaysia in general.

  4. GPs' negotiation strategies regarding sick leave for subjective health complaints

    DEFF Research Database (Denmark)

    Nilsen, Stein Tore; Malterud, Kirsti; Werner, Erik L.

    2015-01-01

    Objectives: To explore general practitioners ’(GPs’) specific negotiation strategies regarding sick-leave issues with patientssuffering from subjective health complaints. Design: Focus-group study. Setting: Nine focus-group interviews in three citiesin different regions of Norway. Participants: 48...... GPs (31 men, 17 women; age 32–65), participating in a course dealing with diagnostic practice and assessment of sickness certifi cates related to patients with subjective health complaints. Results: TheGPs identified some specific strategies that they claimed to apply when dealing with the question...... to sick leave. Conclusions and implications: GPs seem to have a conscious approach to negotiations of sickness certification, as they report applying specific strategies to limit the duration of sick leave due to subjective health complaints. This give-and-take way of handling sick leave negotiations has...

  5. Automatic Road Centerline Extraction from Imagery Using Road GPS Data

    Directory of Open Access Journals (Sweden)

    Chuqing Cao

    2014-09-01

    Full Text Available Road centerline extraction from imagery constitutes a key element in numerous geospatial applications, which has been addressed through a variety of approaches. However, most of the existing methods are not capable of dealing with challenges such as different road shapes, complex scenes, and variable resolutions. This paper presents a novel method for road centerline extraction from imagery in a fully automatic approach that addresses the aforementioned challenges by exploiting road GPS data. The proposed method combines road color feature with road GPS data to detect road centerline seed points. After global alignment of road GPS data, a novel road centerline extraction algorithm is developed to extract each individual road centerline in local regions. Through road connection, road centerline network is generated as the final output. Extensive experiments demonstrate that our proposed method can rapidly and accurately extract road centerline from remotely sensed imagery.

  6. Reduction Vehicle Speed Using GPS Android Smart Phone Programming

    Directory of Open Access Journals (Sweden)

    Sameer Sami Hassan

    2017-07-01

    Full Text Available Today the new generation of smart phone such as Samsung galaxy, Sony, Motorola, HTC is used to build smart applications that made the human life more comfortable and safe. The Android open source operating system with java programming language can be used to develop such applications. In this paper a new software application has been developed using Samsung, galaxy note smart phone to control the speed of vehicle using GPS and Android programming for such smart phone. By collecting the speed and location information from Global Position System (GPS receiver and using the global map application programming interface to determine the location nearby university, school and hospital in Baghdad city. The application will be check the speed of vehicle in zone of school, hospital and university using GPS information. If the speed over the limit the application produce sound alarm to reduce the speed to set up limit.

  7. GPS-based tracking system for TOPEX orbit determination

    Science.gov (United States)

    Melbourne, W. G.

    1984-01-01

    A tracking system concept is discussed that is based on the utilization of the constellation of Navstar satellites in the Global Positioning System (GPS). The concept involves simultaneous and continuous metric tracking of the signals from all visible Navstar satellites by approximately six globally distributed ground terminals and by the TOPEX spacecraft at 1300-km altitude. Error studies indicate that this system could be capable of obtaining decimeter position accuracies and, most importantly, around 5 cm in the radial component which is key to exploiting the full accuracy potential of the altimetric measurements for ocean topography. Topics covered include: background of the GPS, the precision mode for utilization of the system, past JPL research for using the GPS in precision applications, the present tracking system concept for high accuracy satellite positioning, and results from a proof-of-concept demonstration.

  8. Future potential country doctor: the perspectives of German GPs.

    Science.gov (United States)

    Natanzon, Iris; Szecsenyi, Joachim; Ose, Dominik; Joos, Stefanie

    2010-01-01

    There is a shortage of general practitioners (GPs) in many countries, especially in rural areas. There are several reasons for this shortage. Over the last decade, fewer medical students in Germany have decided to work in patient care, even fewer in general practice and fewer still in general practice in rural areas. The aim of this study was to explore the 'pros and cons' of GPs' work in rural areas and to identify from GPs' perspective possible measures for counteracting future GP shortages. Within a qualitative approach, 16 semi-structured interviews were conducted with GPs. Data analysis was carried out using qualitative content analysis. The results were categorized into three main inductively-derived categories: personal, professional and regional/structural level. A higher level of self-confidence and a higher 'feel-good' factor due to GPs originating from rural areas were positive aspects at the personal level. Regarding the professional level, a low level of competition and varied work made a GP's profession attractive in rural areas. Negative aspects were mostly apparent at the regional/structural level, such a low earnings and few leisure facilities. Measures to counter the lack of GPs in rural areas were explored on all three levels: on the personal level, more optimism and resulting satisfaction on the part of doctors in rural areas could be improved by enhancing the benefits of being a doctor in a rural area. Regarding the professional level, more group practices are required to make working as a GP in a rural area more attractive. At a regional/structural level, young physicians who originate from rural areas should be recruited to work in rural areas. Financial incentives are regarded as not sufficient to attract enough young physicians to open practices in rural areas. Future action will be required at the personal, professional and regional/structural levels. The origin of medical students (urban or rural) should be considered a relevant

  9. Integrated INS/GPS Navigation from a Popular Perspective

    Science.gov (United States)

    Omerbashich, Mensur

    2002-01-01

    Inertial navigation, blended with other navigation aids, Global Positioning System (GPS) in particular, has gained significance due to enhanced navigation and inertial reference performance and dissimilarity for fault tolerance and anti-jamming. Relatively new concepts based upon using Differential GPS (DGPS) blended with Inertial (and visual) Navigation Sensors (INS) offer the possibility of low cost, autonomous aircraft landing. The FAA has decided to implement the system in a sophisticated form as a new standard navigation tool during this decade. There have been a number of new inertial sensor concepts in the recent past that emphasize increased accuracy of INS/GPS versus INS and reliability of navigation, as well as lower size and weight, and higher power, fault tolerance, and long life. The principles of GPS are not discussed; rather the attention is directed towards general concepts and comparative advantages. A short introduction to the problems faced in kinematics is presented. The intention is to relate the basic principles of kinematics to probably the most used navigation method in the future-INS/GPS. An example of the airborne INS is presented, with emphasis on how it works. The discussion of the error types and sources in navigation, and of the role of filters in optimal estimation of the errors then follows. The main question this paper is trying to answer is 'What are the benefits of the integration of INS and GPS and how is this, navigation concept of the future achieved in reality?' The main goal is to communicate the idea about what stands behind a modern navigation method.

  10. GPR and GPS data integration: examples of application in Antarctica

    Directory of Open Access Journals (Sweden)

    S. Gandolfi

    2001-06-01

    Full Text Available Ground Penetrating Radar (GPR and Global Positioning System (GPS techniques were employed in snow accumulation studies during the Italian leg of the International Trans-Antarctic Scientific Expedition (ITASE. The acquired data were useful both for glaciological and climatological studies. This paper presents some results obtained by GPR and GPS data integration employed to determine accumulation/ablation processes along the profile of the traverse that show how the snow-sublayer thickness can vary quickly in just a few kilometres. Some examples of data integration employed in detection and characterisation of buried crevasses are also presented.

  11. The Aalborg Survey / Part 2 - GPS Based Survey

    DEFF Research Database (Denmark)

    Harder, Henrik; Reiter, Ida Maria; Christensen, Cecilie Breinholm

    , the GPS based data are supplemented with an attractivity analysis among the 169 respondents. The resulting data are presented in maps in three scales that illustrate the respondents’ use of Aalborg’s urban spaces with regards to the respondent’s movements in time and space. By further coupling the GPS...... data with data on the single respondent’s gender, age, address, activities, mode of transport, use of money etc. it is possible to gain a more detailed knowledge of young people’s use of urban spaces in Aalborg....

  12. Mesure GPS sur le circuit du LIER à Lyon

    OpenAIRE

    GIRARD, PL; MARAIS, J

    2006-01-01

    Depuis quelques années le guidage immatériel pour les autobus est à l'ordre du jour et la localisation est une des contraintes à son développement. Pour subvenir à ces besoins la solution GPS est envisagée. Cette technologie en devenir comporte énormément d'avantage notamment en terme coût et de maintenance. L'expérimentation faite à Lyon met en évidence les performances maximales pouvant être obtenu en utilisant le GPS. RAPPORT DE CONTRAT

  13. Tectonic Model of Bali Island Inferred from GPS Data

    OpenAIRE

    Cecep Sulaeman; Sri Hidayati; Amalfi Omang; Imam Catur Priambodo

    2018-01-01

    DOI: 10.17014/ijog.5.1.81-91Seven periods of GPS campaign have been conducted for three years since March 2013 - October 2015 on fourteen GPS sites across Bali Island. The GAMIT/GLOBK 10.6 version was used to compute data with respect for thirteen reference sites of International Terrestrial Reference Frame (ITRF) 2008 surrounding Bali. The result shows that horizontal displacement varies between 1.93 and 22.53 mm/yr dominantly northeastward. Vertical displacement ranges at -184.34 to 33.79 m...

  14. Autonomous GPS/INS navigation experiment for Space Transfer Vehicle

    Science.gov (United States)

    Upadhyay, Triveni N.; Cotterill, Stephen; Deaton, A. W.

    1993-01-01

    An experiment to validate the concept of developing an autonomous integrated spacecraft navigation system using on board Global Positioning System (GPS) and Inertial Navigation System (INS) measurements is described. The feasibility of integrating GPS measurements with INS measurements to provide a total improvement in spacecraft navigation performance, i.e. improvement in position, velocity and attitude information, was previously demonstrated. An important aspect of this research is the automatic real time reconfiguration capability of the system designed to respond to changes in a spacecraft mission under the control of an expert system.

  15. Compact Disks for GPs - this year - next year?

    Directory of Open Access Journals (Sweden)

    Peter Pritchard

    1995-09-01

    Full Text Available Large databases on compact disk are being published at an increasing rate. Medical CDs are few in number, but some useful ones are available now, and more are on the way. Is this the moment for GPs to invest in CD-ROM technology, or would it pay to wait a bit? Five questions will be addressed. What benefits might GPs get from CDs? What is available now? What CDs are on the way? What hardware and software are needed, at what cost? What is the balance of advantage between publications on CD and paper?

  16. Compact Disks for GPs - this year - next year?

    OpenAIRE

    Peter Pritchard

    1995-01-01

    Large databases on compact disk are being published at an increasing rate. Medical CDs are few in number, but some useful ones are available now, and more are on the way. Is this the moment for GPs to invest in CD-ROM technology, or would it pay to wait a bit? Five questions will be addressed. What benefits might GPs get from CDs? What is available now? What CDs are on the way? What hardware and software are needed, at what cost? What is the balance of advantage between publications on CD and...

  17. Study on index system of GPS interference effect evaluation

    Science.gov (United States)

    Zhang, Kun; Zeng, Fangling; Zhao, Yuan; Zeng, Ruiqi

    2018-05-01

    Satellite navigation interference effect evaluation is the key technology to break through the research of Navigation countermeasure. To evaluate accurately the interference degree and Anti-jamming ability of GPS receiver, this text based on the existing research results of Navigation interference effect evaluation, build the index system of GPS receiver effectiveness evaluation from four levels of signal acquisition, tracking, demodulation and positioning/timing and establish the model for each index. These indexes can accurately and quantitatively describe the interference effect at all levels.

  18. Rail inspection system based on iGPS

    Science.gov (United States)

    Fu, Xiaoyan; Wang, Mulan; Wen, Xiuping

    2018-05-01

    Track parameters include gauge, super elevation, cross level and so on, which could be calculated through the three-dimensional coordinates of the track. The rail inspection system based on iGPS (indoor/infrared GPS) was composed of base station, receiver, rail inspection frame, wireless communication unit, display and control unit and data processing unit. With the continuous movement of the inspection frame, the system could accurately inspect the coordinates of rail; realize the intelligent detection and precision measurement. According to principle of angle intersection measurement, the inspection model was structured, and detection process was given.

  19. The use of GPS at IGN : Geodesy, geophysics, engineering

    Science.gov (United States)

    Boucher, Claude; Willis, Pascal

    The Institut Géographique National has purchased since 1985 four GPS receivers (TR5S from SERCEL, 5 channels, single frequency type). For research and production purpose, a specific software, called GDVS, was then developed. This software is now operational and has been used with success to process several GPS campaigns. Two major campaigns were performed in 1986 : one between France and England and the second one between France and Italy. One of the main topic of these campaigns was to connect tide gauges in the Channel area or in the Mediterranean Sea area, to a global reference frame.

  20. Escritura adolescente: una revisión basada en resultados de investigación recientes

    Directory of Open Access Journals (Sweden)

    Jorge Orlando Amaya Pisco

    2011-09-01

    Full Text Available Este trabajo tiene como objetivo revisar críticamente algunas investigaciones recientes acerca de la escritura en los jóvenes. Consta de tres apartados: en el primero se señalan las investigaciones asociadas a la escritura de estudiantes universitarios de los primeros niveles. En el segundo, se refieren los informes investigativos que centran su reflexión en la escritura de estudiantes de instituciones de secundaria y el tercero hace referencia al panorama investigativo de la escritura extraescolar o disociada directa o indirectamente de los ámbitos curriculares. La revisión aporta dos hallazgos: en primer lugar, el hecho de que las investigaciones recientes sobre escritura elaborada por adolescentes tiende a la cualificación de operaciones metacognitivas; en segundo lugar, la escasa aproximación al estudio de escrituras alternativas a la escritura académica propuesta por la escuela y la universidad. Este tipo de escrituras es considerado, en la mayoría de los casos, como un conjunto de actividades superfluas y de poca importancia.

  1. Application and Limitations of GPS Radio Occultation (GPS-RO) Data for Atmospheric Boundary Layer Height Detection over the Arctic.

    Science.gov (United States)

    Ganeshan, M.; Wu, D. L.

    2014-12-01

    Due to recent changes in the Arctic environment, it is important to monitor the atmospheric boundary layer (ABL) properties over the Arctic Ocean, especially to explore the variability in ABL clouds (such as sensitivity and feedback to sea ice loss). For example, radiosonde and satellite observations of the Arctic ABL height (and low-cloud cover) have recently suggested a positive response to sea ice loss during October that may not occur during the melt season (June-September). Owing to its high vertical and spatiotemporal resolution, an independent ABL height detection algorithm using GPS Radio Occultation (GPS-RO) refractivity in the Arctic is explored. Similar GPS-RO algorithms developed previously typically define the level of the most negative moisture gradient as the ABL height. This definition is favorable for subtropical oceans where a stratocumulus-topped ABL is often capped by a layer of sharp moisture lapse rate (coincident with the temperature inversion). The Arctic Ocean is also characterized by stratocumulus cloud cover, however, the specific humidity does not frequently decrease in the ABL capping inversion. The use of GPS-RO refractivity for ABL height retrieval therefore becomes more complex. During winter months (December-February), when the total precipitable water in the troposphere is a minimum, a fairly straightforward algorithm for ABL height retrieval is developed. The applicability and limitations of this method for other seasons (Spring, Summer, Fall) is determined. The seasonal, interannual and spatial variability in the GPS-derived ABL height over the Arctic Ocean, as well as its relation to the underlying surface (ice vs. water), is investigated. The GPS-RO profiles are also explored for the evidence of low-level moisture transport in the cold Arctic environment.

  2. Research in Application of Geodetic GPS Receivers in Time Synchronization

    Science.gov (United States)

    Zhang, Q.; Zhang, P.; Sun, Z.; Wang, F.; Wang, X.

    2018-04-01

    In recent years, with the development of satellite orbit and clock parameters accurately determining technology and the popularity of geodetic GPS receivers, Common-View (CV) which proposed in 1980 by Allan has gained widespread application and achieved higher accuracy time synchronization results. GPS Common View (GPS CV) is the technology that based on multi-channel geodetic GPS receivers located in different place and under the same common-view schedule to receiving same GPS satellite signal at the same time, and then calculating the time difference between respective local receiver time and GPST by weighted theory, we will obtain the difference between above local time of receivers that installed in different station with external atomic clock. Multi-channel geodetic GPS receivers have significant advantages such as higher stability, higher accuracy and more common-view satellites in long baseline time synchronization application over the single-channel geodetic GPS receivers. At present, receiver hardware delay and surrounding environment influence are main error factors that affect the accuracy of GPS common-view result. But most error factors will be suppressed by observation data smoothing and using of observation data from different satellites in multi-channel geodetic GPS receiver. After the SA (Selective Availability) cancellation, using a combination of precise satellite ephemeris, ionospheric-free dual-frequency P-code observations and accurately measuring of receiver hardware delay, we can achieve time synchronization result on the order of nanoseconds (ns). In this paper, 6 days observation data of two IGS core stations with external atomic clock (PTB, USNO distance of two stations about 6000 km) were used to verify the GPS common-view theory. Through GPS observation data analysis, there are at least 2-4 common-view satellites and 5 satellites in a few tracking periods between two stations when the elevation angle is 15°, even there will be at least

  3. RESEARCH IN APPLICATION OF GEODETIC GPS RECEIVERS IN TIME SYNCHRONIZATION

    Directory of Open Access Journals (Sweden)

    Q. Zhang

    2018-04-01

    Full Text Available In recent years, with the development of satellite orbit and clock parameters accurately determining technology and the popularity of geodetic GPS receivers, Common-View (CV which proposed in 1980 by Allan has gained widespread application and achieved higher accuracy time synchronization results. GPS Common View (GPS CV is the technology that based on multi-channel geodetic GPS receivers located in different place and under the same common-view schedule to receiving same GPS satellite signal at the same time, and then calculating the time difference between respective local receiver time and GPST by weighted theory, we will obtain the difference between above local time of receivers that installed in different station with external atomic clock. Multi-channel geodetic GPS receivers have significant advantages such as higher stability, higher accuracy and more common-view satellites in long baseline time synchronization application over the single-channel geodetic GPS receivers. At present, receiver hardware delay and surrounding environment influence are main error factors that affect the accuracy of GPS common-view result. But most error factors will be suppressed by observation data smoothing and using of observation data from different satellites in multi-channel geodetic GPS receiver. After the SA (Selective Availability cancellation, using a combination of precise satellite ephemeris, ionospheric-free dual-frequency P-code observations and accurately measuring of receiver hardware delay, we can achieve time synchronization result on the order of nanoseconds (ns. In this paper, 6 days observation data of two IGS core stations with external atomic clock (PTB, USNO distance of two stations about 6000 km were used to verify the GPS common-view theory. Through GPS observation data analysis, there are at least 2–4 common-view satellites and 5 satellites in a few tracking periods between two stations when the elevation angle is 15°, even

  4. Kinematics with the assistance of smartphones: Measuring data via GPS - Visualizing data with Google Earth

    Science.gov (United States)

    Gabriel, Patrik; Backhaus, Udo

    2013-04-01

    Nearly every smartphone is now GPS capable. The widespread use of GPS navigation has developed alongside less expensive hardware and user-friendly software interfaces, which may help to bring scientific research and teaching closer to real life.

  5. IceBridge GPS L0 Raw Satellite Navigation Data, Version 1

    Data.gov (United States)

    National Aeronautics and Space Administration — The NASA IceBridge GPS L0 Raw Satellite Navigation Data (IPUTG0) data set contains GPS readings, including latitude, longitude, track, ground speed, off distance,...

  6. WGS 84 Coordinate Validation and Improvement for the NIMA and Air Force GPS Tracking Stations

    National Research Council Canada - National Science Library

    Cunningham, James

    1996-01-01

    Using 10 days of Global Positioning System (GPS) pseudorange and carrier phase data collected in 1995 from 31 stations and 24 Block II/IIA satellites, estimates of GPS clocks, orbits, and tracking station coordinates were generated...

  7. Vähemalt kolm hunti saavad veel GPS-kaelused / Madis Filippov

    Index Scriptorium Estoniae

    Filippov, Madis

    2011-01-01

    Esimene Eesti hunt sai kaela GPS-seadme, mis hakkab edastama teavet looma toitumise ja elupiirkonna kohta, lähiajal on plaanis samasuguse seadme paigaldamine veel vähemalt kolmele hundile. GPS loomadel

  8. EVALUACIÓN DE SUSTENTABILIDAD CON MODELOS DINÁMICOS: PRIMEROS AVANCES EN EL ESTUDIO DEL OASIS DE COMONDÚ, MÉXICO

    Directory of Open Access Journals (Sweden)

    ALICIA TENZA P

    2014-06-01

    Full Text Available El oasis de Comondú es un agroecosistema de gran riqueza ecológica y cultural estrechamente ligado a la presencia de agua en un entorno árido. La subsistencia de sus poblaciones desde antes de la época misional hasta nuestros tiempos es una muestra explícita de sustentabilidad. Sin embargo, condiciones socioeconómicas y ambientales externas han desequilibrado este sistema socioambiental, que se dirige a su declive y desaparición. Nuestro objetivo general es evaluar la sustentabilidad de este sistema socioambiental mediante el enfoque de indicadores integrados en modelos dinámicos. El objetivo de este artículo es presentar este emergente enfoque y mostrar los primeros pasos de esta investigación: la construcción participativa de un modelo conceptual de nuestro sistema de estudio. Hemos identificado las principales variables e interrelaciones, y los procesos históricos que han influido en su dinámica. El modelo conceptual resultante incluye los subsistemas social y económico-productivo. La dinámica general del sistema de Comondú se encuentra en gran medida bajo el control de variables externas, climáticas como huracanes y precipitaciones, y de carácter socioeconómico, como la deslocalización sociopolítica, las ayudas gubernamentales y la intensificación agrícola exterior.

  9. Android App Based Vehicle Tracking Using GPS And GSM

    Directory of Open Access Journals (Sweden)

    Jessica Saini

    2017-09-01

    Full Text Available Global Positioning System GPS is used in numerous applications in todays world. A real time vehicle tracking system using the GPS technology is proposed in this paper. The project Android App based Vehicle Tracking Using GSM AND GPRS mainly focuses in tracking the location of the vehicle on which the device has been installed. It will then send the data in the form of latitude and longitude coordinates through SMS on the users mobile where the coordinates will be plotted in the Android app automatically. Initially the GPS installed in the device takes input from the satellite and stores it in the microcontrollers buffer. In order to track the vehicle the mobile user has to call on the SIM number that is registered in the GSM module of the device. Once the call is received the device authenticates the calling number. If authenticated the location of the vehicle is sent to the registered mobile number in the form of SMS. After sending the message the GSM is deactivated and the GPS is activated again. The coordinates of the location received in the SMS can be viewed on the android app. The hardware part described in the paper comprises of GPRS GSM module LCD to view the coordinates ATMega Microcontroller MAX 232 Arduino RS232 and relay.

  10. Implementation of GPS controlled highway construction equipment, phase III.

    Science.gov (United States)

    2009-02-01

    Beginning in 2006, WisDOT and the Construction Material and Support Center (CMSC) at UW-Madison worked : together to develop the specifications and the QA/QC procedures for GPS machine guidance on highway grading : projects. These specifications and ...

  11. Truck Route Choice Modeling using Large Streams of GPS Data

    Science.gov (United States)

    2017-07-31

    The primary goal of this research was to use large streams of truck-GPS data to analyze travel routes (or paths) chosen by freight trucks to travel between different origin and destination (OD) location pairs in metropolitan regions of Florida. Two s...

  12. GPS: Shaping Student Success One Conversation at a Time

    Science.gov (United States)

    Star, Mikhael; Collette, Lanita

    2010-01-01

    Increasing instructor-student interactions and improving support personnel interventions with students positively affects their academic performance, retention, and graduation rates. This article discusses the Grade Performance Status (GPS) which is Northern Arizona University's new online, academic early alert tool for increasing instructor…

  13. Effects of GPS sampling intensity on home range analyses

    Science.gov (United States)

    Jeffrey J. Kolodzinski; Lawrence V. Tannenbaum; David A. Osborn; Mark C. Conner; W. Mark Ford; Karl V. Miller

    2010-01-01

    The two most common methods for determining home ranges, minimum convex polygon (MCP) and kernel analyses, can be affected by sampling intensity. Despite prior research, it remains unclear how high-intensity sampling regimes affect home range estimations. We used datasets from 14 GPS-collared, white-tailed deer (Odocoileus virginianus) to describe...

  14. Jason-1 and Jason-2 POD Using GPS

    Science.gov (United States)

    Melachroinos, Stavros; Lemoine, Frank G.; Zelensky, Nikita P.; Rowlands, David D.; Luthcke, Scott B.; Beckley, Brian D.

    2012-01-01

    The Jason-2 satellite, launched in June 2008, is the latest follow-on to the successful Jason-1 altimetry satellite mission launched in December 7, 2001. Both, Jason-2 and Jason-1 are equipped with a GPS dual-frequency receiver, a laser retroreflector array, and a DORIS receiver for precise orbit determination (POD). A series of dynamic and reduced-dynamic Jason-2 orbits computed at NASA GSFC, based on GPS-only data and the std0905 standards, have been completed till cy74through cycle 74 using the IGS05 framework. These orbits, now publicly available, have been shown to agree radially at 1 cm RMS with the GSFC std0905 SLR/DORIS orbits and in comparison with orbits produced by JPL, ESA and CNES. In this paper, we describe the implementation of the IGS08 and repro1 framework for the Jason-2 and Jason-1 GPS POD processing with the NASA GSFC GEODYN software. . In our updated GPS POD, ambiguity fixing and updated time variable and static gravity fields. We also evaluate the implementation of non-tidal and degree-1 loading displacement as forward modeling to the tracking stations. Reduced-dynamic versus dynamic orbit differences are used to characterize the remaining force model errors and TRF instability. In particular, we assess their consistency radially and the stability of the altimeter satellite reference frame in the North/South direction as a proxy to assess the consistency of the reference frame.

  15. Variability of GPS Radio Sources at 5 GHz

    Indian Academy of Sciences (India)

    GPS) radio sources at 5 GHz and find that about one-third of them show considerable Inter-Month Variability (IMV), and these IMV phenomena are likely to be caused by interstellar scintillation (ISS). Furthermore, we find that those showing IMV ...

  16. GPS location data enhancement in electronic traffic records.

    Science.gov (United States)

    2013-01-01

    In this project we developed a new GPS-based Geographical Information Exchange : Framework (GIEF) to improve the correctness and accuracy of location data reported on : electronic police forms in Oklahoma. A second major goal was to provide a base le...

  17. Improved Solar-Radiation-Pressure Models for GPS Satellites

    Science.gov (United States)

    Bar-Sever, Yoaz; Kuang, Da

    2006-01-01

    A report describes a series of computational models conceived as an improvement over prior models for determining effects of solar-radiation pressure on orbits of Global Positioning System (GPS) satellites. These models are based on fitting coefficients of Fourier functions of Sun-spacecraft- Earth angles to observed spacecraft orbital motions.

  18. by monitoring microgravity and GPS/GNSS methods

    Indian Academy of Sciences (India)

    Dokuz Eylul University, Department of Geophysical Engineering, Tınaztepe Campus, Buca, Izmir, Turkey. ∗. Corresponding author. e-mail: .... For processing GPS/GNSS data, the software, which is called GAMIT/GLOBK (Herring 2009; .... trend for DEU6, DEU7, DEU8, DEU5, DEU11 measurement points (uplift), stable for ...

  19. An alternative methodology for the mathematical treatment of GPS positioning

    Directory of Open Access Journals (Sweden)

    Aly M. El-naggar

    2011-12-01

    In this paper a simple alternative method is developed to solve the GPS navigation equations directly without linearization and iteration. A practical study was done to evaluate the new model. Performance analysis was conducted using data collected by Trimble 4000SSE dual frequency receiver. The results indicated that the alternative methodology is simple, fast, and accurate as compared to Taylor method.

  20. GPS-based ionospheric tomography with a constrained adaptive ...

    Indian Academy of Sciences (India)

    Gauss weighted function is introduced to constrain the tomography system in the new method. It can resolve the ... the research focus in the fields of space geodesy and ... ment of GNSS such as GPS, Glonass, Galileo and. Compass, as these ...

  1. Ionospheric correction for spaceborne single-frequency GPS based ...

    Indian Academy of Sciences (India)

    The Klobuchar model was used to compute ionospheric delays for the dlft station, and .... dual-frequency GPS receivers; therefore, the iono- ... The mapping function is defined as the ratio of .... eter in the processing of an extended set of single.

  2. Evaluation of EGM2008 by means of GPS Levelling Uganda

    African Journals Online (AJOL)

    Personal

    The global gravity model EGM2008 is evaluated in various regions of ... two so that the computed difference [0.118m] in datum offset for the two states does tell us .... GAMIT is a collection of programs to process GPS phase data to estimate ...

  3. Using GPS-tracking technology for urban design interventions

    NARCIS (Netherlands)

    Van der Spek, S.C.; Van Langelaar, C.M.

    2011-01-01

    The aim of this paper is to express the application of tracking technologies in Urban Design and Planning. Tracking technologies can be used to monitor different user groups in different occasions. Since 2005, TU Delft has explored and developed two types of research using GPS to collect spatio

  4. GPs motivations of prescribing antidepressants and their practical relevance.

    NARCIS (Netherlands)

    Volkers, A.; Jong, A. de; Braspenning, J.C.C.; Bakker, D. de; Dijk, L. van

    2004-01-01

    Background: Insight in the motivations of prescribing antidepressants may contribute to advance the efficiency of the current, large antidepressant prescription rate. Less is known about why general practitioners (GPs) treat patients with antidepressants or not and choose modern SSRIs instead of the

  5. Evaluating the accuracy of GPS-based taxi trajectory records

    NARCIS (Netherlands)

    Zheng, Zhong; Rasouli, Soora; Timmermans, Harry

    2014-01-01

    Taxi data are an underused source of travel information. A handful of research has been concerned with the processing of raw taxi GPS data to minimize random error. The study of methods that systematically detect erroneous data has, however, received less attention. Generally, an origin and a

  6. Detecting Traffic Anomalies in Urban Areas Using Taxi GPS Data

    Directory of Open Access Journals (Sweden)

    Weiming Kuang

    2015-01-01

    Full Text Available Large-scale GPS data contain hidden information and provide us with the opportunity to discover knowledge that may be useful for transportation systems using advanced data mining techniques. In major metropolitan cities, many taxicabs are equipped with GPS devices. Because taxies operate continuously for nearly 24 hours per day, they can be used as reliable sensors for the perceived traffic state. In this paper, the entire city was divided into subregions by roads, and taxi GPS data were transformed into traffic flow data to build a traffic flow matrix. In addition, a highly efficient anomaly detection method was proposed based on wavelet transform and PCA (principal component analysis for detecting anomalous traffic events in urban regions. The traffic anomaly is considered to occur in a subregion when the values of the corresponding indicators deviate significantly from the expected values. This method was evaluated using a GPS dataset that was generated by more than 15,000 taxies over a period of half a year in Harbin, China. The results show that this detection method is effective and efficient.

  7. Cell jammers, GPS jammers, and other jamming devices.

    Science.gov (United States)

    2012-10-15

    We caution consumers that it is against the law to use a cell or GPS jammer or any other type of device that blocks, : jams or interferes with authorized communications, as well as to import, advertise, sell, or ship such a device. The : FCC Enforcem...

  8. GPS-based ionospheric tomography with a constrained adaptive ...

    Indian Academy of Sciences (India)

    According to the continuous smoothness of the variations of ionospheric electron density (IED) among neighbouring voxels, Gauss weighted function is introduced to constrain the tomography system in the new method. It can resolve the dependence on the initial values for those voxels without any GPS rays traversing them ...

  9. Managing the GPS/GIS function in an electric utility

    International Nuclear Information System (INIS)

    Michelsen, M.W. Jr.

    1999-01-01

    A new period of higher significance has arrived for the GPS/GIS function at electric utilities such that to a degree never seen before, utility managers are looking to their GIS programs, filled with increasingly accurate data collected by GPS technology, before making many decisions. With this capability comes an expectation for GPS/GIS professionals to provide higher levels of planning and management of their data collection process. At Duke Power in Charlotte, North Carolina, managers rely on GPS mapping to fill their data collection equipment needs. When the city of Charlotte requested a more detailed billing system, Duke Power co-sponsored the street lighting inventory project, a comprehensive program implemented to fully account for street lighting facilities within the billing area. One of the key projects to be kept in mind was the creation of a common data base viewable by GIS from which a bill could be created and as well reveal data. A billing calculation routine can be run against the data base to generate a bill or use MapInfo to see a graphical picture. Prior to the creation of this data base capability, the difference between the data base as a display tool and billing system was a potential source of discrepancy, which is eliminated now. Creating the data base allows more than just creating a bill for the city, it allows Duke Power to work better with the city by improving its billing accountability and provides better service as well

  10. GPS surveying method applied to terminal area navigation flight experiments

    Energy Technology Data Exchange (ETDEWEB)

    Murata, M; Shingu, H; Satsushima, K; Tsuji, T; Ishikawa, K; Miyazawa, Y; Uchida, T [National Aerospace Laboratory, Tokyo (Japan)

    1993-03-01

    With an objective of evaluating accuracy of new landing and navigation systems such as microwave landing guidance system and global positioning satellite (GPS) system, flight experiments are being carried out using experimental aircraft. This aircraft mounts a GPS and evaluates its accuracy by comparing the standard orbits spotted by a Kalman filter from the laser tracing data on the aircraft with the navigation results. The GPS outputs position and speed information from an earth-centered-earth-fixed system called the World Geodetic System, 1984 (WGS84). However, in order to compare the navigation results with output from a reference orbit sensor or other navigation sensor, it is necessary to structure a high-precision reference coordinates system based on the WGS84. A method that applies the GPS phase interference measurement for this problem was proposed, and used actually in analyzing a flight experiment data. As referred to a case of the method having been applied to evaluating an independent navigation accuracy, the method was verified sufficiently effective and reliable not only in navigation method analysis, but also in the aspect of navigational operations. 12 refs., 10 figs., 5 tabs.

  11. Video-Aided GPS/INS Positioning and Attitude Determination

    National Research Council Canada - National Science Library

    Brown, Alison; Silva, Randy

    2006-01-01

    ... precise positioning and attitude information to be maintained, even during periods of extended GPS dropouts. This relies on information extracted from the video images of reference points and features to continue to update the inertial navigation solution. In this paper, the principles of the video-update method aredescribed.

  12. A generalized development model for testing GPS user equipment

    Science.gov (United States)

    Hemesath, N.

    1978-01-01

    The generalized development model (GDM) program, which was intended to establish how well GPS user equipment can perform under a combination of jamming and dynamics, is described. The systems design and the characteristics of the GDM are discussed. The performance aspects of the GDM are listed and the application of the GDM to civil aviation is examined.

  13. Asthma prescription patterns for children: can GPs do better?

    NARCIS (Netherlands)

    Uijen, J.H.J.M.; Wouden, J.C. van der; Schellevis, F.G.; Willemsen, S.P.; Suijlekom-Smit, L.W.A. van; Bindels, P.J.E.

    2011-01-01

    Background: Assessing prescription patterns of asthma medication for children is helpful to optimize prescribing by general practitioners (GPs). The aim was to explore prescription patterns in children with physician-diagnosed asthma and its determinants in general practice. Methods: We used the

  14. Evaluation of Mobile Phone Interference With Aircraft GPS Navigation Systems

    Science.gov (United States)

    Pace, Scott; Oria, A. J.; Guckian, Paul; Nguyen, Truong X.

    2004-01-01

    This report compiles and analyzes tests that were conducted to measure cell phone spurious emissions in the Global Positioning System (GPS) radio frequency band that could affect the navigation system of an aircraft. The cell phone in question had, as reported to the FAA (Federal Aviation Administration), caused interference to several GPS receivers on-board a small single engine aircraft despite being compliant with data filed at the time with the FCC by the manufacturer. NASA (National Aeronautics and Space Administration) and industry tests show that while there is an emission in the 1575 MHz GPS band due to a specific combination of amplifier output impedance and load impedance that induces instability in the power amplifier, these spurious emissions (i.e., not the intentional transmit signal) are similar to those measured on non-intentionally transmitting devices such as, for example, laptop computers. Additional testing on a wide sample of different commercial cell phones did not result in any emission in the 1575 MHz GPS Band above the noise floor of the measurement receiver.

  15. A different approach to the analysis of GPS scintillations data

    International Nuclear Information System (INIS)

    Forte, B.; Radicella, S.M.; Ezquer, R.G.

    2001-09-01

    Amplitude scintillations data from GPS have been analyzed. The objective is to estimate the impact of ionospheric scintillations at Satellite-Based Augmentation System (SBAS) Ranging and Integrity Monitoring Station (RIMS) level and at GPS user level. For this purpose a new approach to the problem has been considered. Data have been studied from the point of view of the impact of scintillations on the calculation of VTEC at pierce points and ionospheric grid points. An ionospheric grid of 5 deg. by 5 deg. surface squares has been assumed. From geometrical considerations and taking into account the basic principle to compute VTEC at grid points, with the data analyzed it is shown that very seldom scintillations can affect the calculation of a grid point VTEC. Data from all the RIMS and for the entire GPS satellites network must be analyzed simultaneously to describe a realistic scenario for the impact of scintillations on SBAS. Finally, GPS scintillation data have been analyzed at user level: service availability problems have been encountered. (author)

  16. Development and Validation of the Game Perception Scale (GPS)

    Science.gov (United States)

    Vandercruysse, Sylke; Vandewaetere, Mieke; Maertens, Marie; ter Vrugte, Judith; Wouters, Pieter; de Jong, Ton; van Oostendorp, Herre; Elen, Jan

    2015-01-01

    Despite the pervasiveness of perception and considerable impact of perception on the use of ICT for educational purposes, there is a surprising paucity of perception assessment instruments. The present proposal expands on this through the development and initial validation of the Game Perception Scale (GPS). Based on perception literature,…

  17. A GPS measurement system for precise satellite tracking and geodesy

    Science.gov (United States)

    Yunck, T. P.; Wu, S.-C.; Lichten, S. M.

    1985-01-01

    NASA is pursuing two key applications of differential positioning with the Global Positioning System (GPS): sub-decimeter tracking of earth satellites and few-centimeter determination of ground-fixed baselines. Key requirements of the two applications include the use of dual-frequency carrier phase data, multiple ground receivers to serve as reference points, simultaneous solution for use position and GPS orbits, and calibration of atmospheric delays using water vapor radiometers. Sub-decimeter tracking will be first demonstrated on the TOPEX oceanographic satellite to be launched in 1991. A GPS flight receiver together with at least six ground receivers will acquire delta range data from the GPS carriers for non-real-time analysis. Altitude accuracies of 5 to 10 cm are expected. For baseline measurements, efforts will be made to obtain precise differential pseudorange by resolving the cycle ambiguity in differential carrier phase. This could lead to accuracies of 2 or 3 cm over a few thousand kilometers. To achieve this, a high-performance receiver is being developed, along with improved calibration and data processing techniques. Demonstrations may begin in 1986.

  18. GPS/MEMS IMU/Microprocessor Board for Navigation

    Science.gov (United States)

    Gender, Thomas K.; Chow, James; Ott, William E.

    2009-01-01

    A miniaturized instrumentation package comprising a (1) Global Positioning System (GPS) receiver, (2) an inertial measurement unit (IMU) consisting largely of surface-micromachined sensors of the microelectromechanical systems (MEMS) type, and (3) a microprocessor, all residing on a single circuit board, is part of the navigation system of a compact robotic spacecraft intended to be released from a larger spacecraft [e.g., the International Space Station (ISS)] for exterior visual inspection of the larger spacecraft. Variants of the package may also be useful in terrestrial collision-detection and -avoidance applications. The navigation solution obtained by integrating the IMU outputs is fed back to a correlator in the GPS receiver to aid in tracking GPS signals. The raw GPS and IMU data are blended in a Kalman filter to obtain an optimal navigation solution, which can be supplemented by range and velocity data obtained by use of (l) a stereoscopic pair of electronic cameras aboard the robotic spacecraft and/or (2) a laser dynamic range imager aboard the ISS. The novelty of the package lies mostly in those aspects of the design of the MEMS IMU that pertain to controlling mechanical resonances and stabilizing scale factors and biases.

  19. Danish GPs' perception of disease risk and benefit of prevention

    DEFF Research Database (Denmark)

    Nexøe, Jørgen; Gyrd-Hansen, Dorte; Kragstrup, Jakob

    2002-01-01

    risk reduction. RESULTS: The GPs' attitude towards recommending medical treatment was dependent on the phrasing of risk reductions. Seventy-two per cent of doctors who received all information on risk reductions would definitely or probably recommend medication, while 91% would recommend medication...... to take into account all available measures of risk reductions....

  20. Remote landslide mapping using a laser rangefinder binocular and GPS

    Directory of Open Access Journals (Sweden)

    M. Santangelo

    2010-12-01

    Full Text Available We tested a high-quality laser rangefinder binocular coupled with a GPS receiver connected to a Tablet PC running dedicated software to help recognize and map in the field recent rainfall-induced landslides. The system was tested in the period between March and April 2010, in the Monte Castello di Vibio area, Umbria, Central Italy. To test the equipment, we measured thirteen slope failures that were mapped previously during a visual reconnaissance field campaign conducted in February and March 2010. For reference, four slope failures were also mapped by walking the GPS receiver along the landslide perimeter. Comparison of the different mappings revealed that the geographical information obtained remotely for each landslide by the rangefinder binocular and GPS was comparable to the information obtained by walking the GPS around the landslide perimeter, and was superior to the information obtained through the visual reconnaissance mapping. Although our tests were not exhaustive, we maintain that the system is effective to map recent rainfall induced landslides in the field, and we foresee the possibility of using the same (or similar system to map landslides, and other geomorphological features, in other areas.

  1. Utilization of GPS Tropospheric Delays for Climate Research

    International Nuclear Information System (INIS)

    Suparta, Wayan

    2017-01-01

    The tropospheric delay is one of the main error sources in Global Positioning Systems (GPS) and its impact plays a crucial role in near real-time weather forecasting. Accessibility and accurate estimation of this parameter are essential for weather and climate research. Advances in GPS application has allowed the measurements of zenith tropospheric delay (ZTD) in all weather conditions and on a global scale with fine temporal and spatial resolution. In addition to the rapid advancement of GPS technology and informatics and the development of research in the field of Earth and Planetary Sciences, the GPS data has been available free of charge. Now only required sophisticated processing techniques but user friendly. On the other hand, the ZTD parameter obtained from the models or measurements needs to be converted into precipitable water vapor (PWV) to make it more useful as a component of weather forecasting and analysis atmospheric hazards such as tropical storms, flash floods, landslide, pollution, and earthquake as well as for climate change studies. This paper addresses the determination of ZTD as a signal error or delay source during the propagation from the satellite to a receiver on the ground and is a key driving force behind the atmospheric events. Some results in terms of ZTD and PWV will be highlighted in this paper. (paper)

  2. Kalman filter implementation for small satellites using constraint GPS data

    Science.gov (United States)

    Wesam, Elmahy M.; Zhang, Xiang; Lu, Zhengliang; Liao, Wenhe

    2017-06-01

    Due to the increased need for autonomy, an Extended Kalman Filter (EKF) has been designed to autonomously estimate the orbit using GPS data. A propagation step models the satellite dynamics as a two body with J2 (second zonal effect) perturbations being suitable for orbits in altitudes higher than 600 km. An onboard GPS receiver provides continuous measurement inputs. The continuity of measurements decreases the errors of the orbit determination algorithm. Power restrictions are imposed on small satellites in general and nanosatellites in particular. In cubesats, the GPS is forced to be shut down most of the mission’s life time. GPS is turned on when experiments like atmospheric ones are carried out and meter level accuracy for positioning is required. This accuracy can’t be obtained by other autonomous sensors like magnetometer and sun sensor as they provide kilometer level accuracy. Through simulation using Matlab and satellite tool kit (STK) the position accuracy is analyzed after imposing constrained conditions suitable for small satellites and a very tight one suitable for nanosatellite missions.

  3. Communication plan of GPS monitoring system based on the Internet

    Science.gov (United States)

    Xing, Xiangpeng; Liu, Zhenan; Bao, Yuanlu

    2005-11-01

    In GPS monitoring system, wireless communications network is necessary to keep base station in contact with mobile stations. Public communications network and personal communications network can't work well all the time. In this article, an economical communications network that can be competent for communication of GPS monitoring system is introduced. Personal communications network is used in this GPS monitoring system. In order to enlarge the coverage area and to expand the capacity of the personal communications network, the concept of cellular radio system is introduced. Because only the non-adjacent cells can use the same frequency channel, handoff of mobile station is extremely important when it goes in another cell. The mobile station of the system will know its own longitude and latitude by receiving data from GPS satellites all the time, so it can change its working frequency channel according to its position. Internet, instead of personal communication cable, is used to connect the base stations. So the communications network has the advantage of public communications network and personal one.

  4. Seasonal and circadian biases in bird tracking with solar GPS-tags

    OpenAIRE

    Silva, Rafa; Afán, Isabel; Gil, Juan A.; Bustamante, Javier

    2017-01-01

    Global Positioning System (GPS) tags are nowadays widely used in wildlife tracking. This geolocation technique can suffer from fix loss biases due to poor satellite GPS geometry, that result in tracking data gaps leading to wrong research conclusions. In addition, new solar-powered GPS tags deployed on birds can suffer from a new "battery drain bias" currently ignored in movement ecology analyses. We use a GPS tracking dataset of bearded vultures (Gypaetus barbatus), tracked for several years...

  5. The application of GPS time information in the telemetry ground station

    International Nuclear Information System (INIS)

    Zhang Songtao; Zhang Yusong; Sun Xiurui

    2001-01-01

    GPS time information is a kind of practicable information resource that can be shared all over the world. Now it is the most accurate wireless time information. The major of this paper is the application information of GPS time information in telemetry. The main point introduces how to make use of the GPS time information to produce GPS-IRIG-B time code for proving ground and how to send time information to related equipment in telemetry ground station

  6. [Quality of life of women GPs in Auvergne].

    Science.gov (United States)

    Mathonnat, Marie Dolorès; Filloux, Isabelle; Tanguy, Gilles; Eschalier, Bénédicte; Pereira, Bruno; Vorilhon, Philippe

    2013-10-01

    The medical profession is feminising. In parallel, the importance of quality of life (QOL) must be addressed. Family practice needs personal investment and availability. This profession can have repercussions on womens' QOL. The objective of the study was to compare female GPs QOL to other women with the comparable socioprofessional status. The secondary objective was to study the influence of factors, such as workplace and work methods. Comparative cross-sectional study. A self-assessed questionnaire, sent by post to 394 female general practitioners in Auvergne, each was asked to recruit one woman (non-GP), with similar age and socioprofessional status. A total of 148 female GPs (37.6%) and 122 non-GPs responded. The global score of QOL was lower in the GP group, noticeably showing a poorer QOL in the relational and material areas. The professional QOL was similar between the 2 groups. The study did not find a significant difference concerning the QOL in its physical and psychological dimensions. The main negative factors influencing the QOL were: age; isolation of the occupation; living alone; and liberal occupation. Working in a rural area did not influence the QOL. The profession of GPs remains demanding, and the female GP feels a poorer QOL. Nevertheless, they seem to like their job and they feel fulfilled. The uneasiness comes essentially from the lack of free time, and from low financial income. Working in association seems to be a first step to improve the QOL of female GPs. Copyright © 2013 Elsevier Masson SAS. All rights reserved.

  7. Fast-Acquisition/Weak-Signal-Tracking GPS Receiver for HEO

    Science.gov (United States)

    Wintemitz, Luke; Boegner, Greg; Sirotzky, Steve

    2004-01-01

    A report discusses the technical background and design of the Navigator Global Positioning System (GPS) receiver -- . a radiation-hardened receiver intended for use aboard spacecraft. Navigator is capable of weak signal acquisition and tracking as well as much faster acquisition of strong or weak signals with no a priori knowledge or external aiding. Weak-signal acquisition and tracking enables GPS use in high Earth orbits (HEO), and fast acquisition allows for the receiver to remain without power until needed in any orbit. Signal acquisition and signal tracking are, respectively, the processes of finding and demodulating a signal. Acquisition is the more computationally difficult process. Previous GPS receivers employ the method of sequentially searching the two-dimensional signal parameter space (code phase and Doppler). Navigator exploits properties of the Fourier transform in a massively parallel search for the GPS signal. This method results in far faster acquisition times [in the lab, 12 GPS satellites have been acquired with no a priori knowledge in a Low-Earth-Orbit (LEO) scenario in less than one second]. Modeling has shown that Navigator will be capable of acquiring signals down to 25 dB-Hz, appropriate for HEO missions. Navigator is built using the radiation-hardened ColdFire microprocessor and housing the most computationally intense functions in dedicated field-programmable gate arrays. The high performance of the algorithm and of the receiver as a whole are made possible by optimizing computational efficiency and carefully weighing tradeoffs among the sampling rate, data format, and data-path bit width.

  8. 78 FR 13396 - 90th Meeting: RTCA Special Committee 159, Global Positioning Systems (GPS)

    Science.gov (United States)

    2013-02-27

    ... 159, Global Positioning Systems (GPS) AGENCY: Federal Aviation Administration (FAA), U.S. Department... 159, Global Positioning Systems (GPS) SUMMARY: The FAA is issuing this notice to advise the public of the eighty-ninth meeting of the RTCA Special Committee 159, Global Positioning Systems (GPS). DATES...

  9. 75 FR 2581 - Eighty-First Meeting: RTCA Special Committee 159: Global Positioning System (GPS)

    Science.gov (United States)

    2010-01-15

    ... Committee 159: Global Positioning System (GPS) AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice of RTCA Special Committee 159 meeting: Global Positioning System (GPS). SUMMARY: The FAA is... System (GPS). DATES: The meeting will be held February 2-5, 2010, from 9 a.m. to 4:30 p.m. (unless stated...

  10. 76 FR 27744 - Eighty-Fifth Meeting: RTCA Special Committee 159: Global Positioning System (GPS)

    Science.gov (United States)

    2011-05-12

    ... Committee 159: Global Positioning System (GPS) AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice of RTCA Special Committee 159 meeting: Global Positioning System (GPS). SUMMARY: The FAA is... System (GPS). DATES: The meeting will be held May 26, 2011, from 9 a.m. to 11:45 a.m. ADDRESSES: The...

  11. 77 FR 25150 - GPS Satellite Simulator Working Group; Notice of Meeting

    Science.gov (United States)

    2012-04-27

    ... DEPARTMENT OF DEFENSE Department of the Air Force GPS Satellite Simulator Working Group; Notice of Meeting AGENCY: The United States Air Force, DoD. ACTION: Amending GPS Simulator Working group Meeting Notice. SUMMARY: We are requesting to amend the date of the GPS Simulator Working group meeting notice...

  12. 76 FR 67019 - Eighty-Seventh: RTCA Special Committee 159: Global Positioning System (GPS)

    Science.gov (United States)

    2011-10-28

    ... Committee 159: Global Positioning System (GPS) AGENCY: Federal Aviation Administration (FAA), U.S... System (GPS). SUMMARY: The FAA is issuing this notice to advise the public of a meeting of RTCA Special Committee 159: Global Positioning System (GPS) 87th meeting. DATES: The meeting will be held November 14-18...

  13. 76 FR 33022 - Eighty-Sixth Meeting: RTCA Special Committee 159: Global Positioning System (GPS)

    Science.gov (United States)

    2011-06-07

    ... Committee 159: Global Positioning System (GPS) AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice of RTCA Special Committee 159 meeting: Global Positioning System (GPS). SUMMARY: The FAA is... System (GPS). DATES: The meeting will be held June 13-17, 2011, from 9 a.m. to 4:30 p.m. ADDRESSES: The...

  14. 78 FR 57672 - 91st Meeting: RTCA Special Committee 159, Global Positioning Systems (GPS)

    Science.gov (United States)

    2013-09-19

    ... 159, Global Positioning Systems (GPS) AGENCY: Federal Aviation Administration (FAA), U.S. Department... 159, Global Positioning Systems (GPS). SUMMARY: The FAA is issuing this notice to advise the public of the ninety-first meeting of the RTCA Special Committee 159, Global Positioning Systems (GPS) DATES...

  15. 77 FR 12106 - 88th Meeting: RTCA Special Committee 159, Global Positioning System (GPS)

    Science.gov (United States)

    2012-02-28

    ... 159, Global Positioning System (GPS) AGENCY: Federal Aviation Administration (FAA), U.S. Department of Transportation (DOT). ACTION: Notice of RTCA Special Committee 159, Global Positioning System (GPS). SUMMARY: The..., Global Positioning System (GPS). DATES: The meeting will be held March 13-16, 2012, from 9 a.m.-4:30 p.m...

  16. USGS earthquake hazards program (EHP) GPS use case : earthquake early warning (EEW) and shake alert

    Science.gov (United States)

    2017-03-30

    GPS Adjacent Band Workshop VI RTCA Inc., Washington D.C., 30 March 2017. USGS GPS receiver use case - Real-Time GPS for EEW -Continued: CRITICAL EFFECT - The GNSS component of the Shake Alert system augments the inertial sensors and is especial...

  17. Pandora's electronic box: GPs reflect upon email communication with their patients

    Directory of Open Access Journals (Sweden)

    Felicity Goodyear-Smith

    2005-11-01

    Conclusion Study sample closely mirrored current NZ GP population. Although few GPs emailed with patients, many might once barriers are addressed. GPs had a collective view of the appropriate boundaries for email communication, routine tasks and the transmission of information. GPs would encourage professional debate regarding guidelines for good practice, managing demand and remuneration.

  18. Effect of an evidence-based answering service on GPs and their patients : a pilot study

    NARCIS (Netherlands)

    Verhoeven, A.A.; Schuling, J.

    2004-01-01

    OBJECTIVES: For general practitioners (GPs), an important obstacle to practising evidence-based medicine is lack of time. An evidence-based answering service was developed that took over searching and appraisal of medical evidence from the GPs. GPs sent in questions, and the informationist

  19. 77 FR 25510 - GPS Funds I, et al.; Notice of Application

    Science.gov (United States)

    2012-04-30

    ...] GPS Funds I, et al.; Notice of Application April 24, 2012. AGENCY: Securities and Exchange Commission... the Act to invest in certain financial instruments. Applicants: GPS Funds I, GPS Funds II (each a.... FOR FURTHER INFORMATION CONTACT: Laura L. Solomon, Senior Counsel, at (202) 551-6915 or Daniele...

  20. Using GPS to evaluate productivity and performance of forest machine systems

    Science.gov (United States)

    Steven E. Taylor; Timothy P. McDonald; Matthew W. Veal; Ton E. Grift

    2001-01-01

    This paper reviews recent research and operational applications of using GPS as a tool to help monitor the locations, travel patterns, performance, and productivity of forest machines. The accuracy of dynamic GPS data collected on forest machines under different levels of forest canopy is reviewed first. Then, the paper focuses on the use of GPS for monitoring forest...

  1. How do GPs recognize needs for palliative care in their patients?

    NARCIS (Netherlands)

    Claessen, S.J.; Francke, A.L.; Deliens, L.

    2012-01-01

    Aim: The aim of this study was to explore how GPs in the Netherlands recognize patients’ needs for palliative care. Methods: We conducted qualitative semi-structured interviews with about 25 GPs. These GPs were interviewed about recognition of the needs for palliative care in their patients and how

  2. GPS radio collar 3D performance as influenced by forest structure and topography

    Science.gov (United States)

    R. Scott Gamo; Mark A. Rumble; Fred Lindzey; Matt Stefanich

    2000-01-01

    Global Positioning System (GPS) telemetry enables biologists to obtain accurate and systematic locations of animals. Vegetation can block signals from satellites to GPS radio collars. Therefore, a vegetation dependent bias to telemetry data may occur which if quantified, could be accounted for. We evaluated the performance of GPS collars in 6 structural stage...

  3. Retained satellite information influences performance of GPS devices in a forested ecosystem

    Science.gov (United States)

    Katie M. Moriarty; Clinton W. Epps

    2015-01-01

    Global Positioning System (GPS) units used in animal telemetry often suffer from nonrandom data loss and location error. GPS units use stored satellite information to estimate locations, including almanac and ephemeris data reflecting satellite positions at weekly and at <4-hr temporal scales, respectively. Using the smallest GPS collars (45–51 g) available for...

  4. Prevalencia y factores asociados con la duración de la lactancia materna exclusiva durante los 6 primeros meses en la cohorte INMA de Guipúzcoa

    Directory of Open Access Journals (Sweden)

    Madalen Oribe

    2015-01-01

    Conclusiones: Los resultados de este estudio pueden ser de utilidad para los profesionales sanitarios y desde una perspectiva de salud pública, ya que permiten diseñar estrategias para apoyar a las madres lactantes, teniendo en cuenta las razones principales de abandono temprano y tras la reincorporación a la vida laboral.

  5. Educación histórica en Portugal: metas de aprendizaje en los primeros años de escolaridad

    Directory of Open Access Journals (Sweden)

    Isabel BARCA

    2012-01-01

    Full Text Available El proyecto K--Basic sobre resultados de aprendizaje para el escolarización llevado a cabo recientemente en Portugal tiene la intención de producir un conjunto de resultados de aprendizaje de cada materia o área curricular. Su objetivo prioritario ha sido proporcionar un conjunto de herramientas útiles para el proceso de enseñanza, promoviendo así los logros de los estudiantes. Con respecto a los resultados de la historia de aprendizaje, su equipo se inspiró en los correspondientes estudios empíricos sobre la cognición histórica fundada en las últimas perspectivas epistemológicas sobre el tema. En este marco, este artículo analiza algunos de los ¿Resultados de Aprendizaje Histórico¿ para los K-Cycle (3--10 años de edad, considerada como significativa a la luz del pensamiento histórico y la conciencia.

  6. Validity Examination of EFQM’s Results by DEA Models = Examen de la validez de los resultados de EFQM mediante modelos DEA

    Directory of Open Access Journals (Sweden)

    Ben Mustafa, Adli

    2008-01-01

    Full Text Available Validity Examination of EFQM’s Results by DEA Models = Examen de la validez de los resultados de EFQM mediante modelos DEAAbstract: The European Foundation Quality Management is one of the models which deal with the assessment of function of an organization using a self-assessment for measuring the concepts some of which are more and more qualitative. Consequently, complete understanding and correct usage of this model in an organization depend on the comprehensive recognition of that model and different strategies of self-assessment. The process of self-assessment on the basis of this model in an organization needs to use the experienced auditors. This leads to reduce the wrong privilege making to the criteria and to subcriteria probable way. In this paper, first some of the weaknesses of the EFQM model are studied, then with the usage of structure of input-output governing of the model and using of Data Envelopment Analysis, a method is offered to recognize the lack of the proportion between Enablers and the results of organization which may occur due to problems and obstacles hidden in the heart of organization. = La Fundación Europea de Gestión de la Calidad (EFQM significa uno de los modelos para la evaluación de las funciones de las organizaciones, utilizando la autoevaluación para medir aspectos que, algunos de los cuales, son cada vez más cualitativos. Consecuentemente, la comprensión completa y el uso correcto de este modelo en una organización dependen del conocimiento profundo del modelo y de las diferentes estrategias de autoevaluación. El proceso de autoevaluación en la base de este modelo, en cualquier organización, necesita la intervención de auditores experimentados. Esto es precisamente lo que lleva a reducir el uso incorrecto de los criterios y de los subcriterios. En este artículo, primero se estudian algunas de las debilidades del modelo EFQM y después, mediante la utilización de estructura de control de

  7. High-sensitivity modified Glasgow prognostic score (HS-mGPS) Is superior to the mGPS in esophageal cancer patients treated with chemoradiotherapy

    OpenAIRE

    Chen, Peng; Fang, Min; Wan, Qiuyan; Zhang, Xuebang; Song, Tao; Wu, Shixiu

    2017-01-01

    The present study compared the prognostic value of the modified Glasgow prognostic score (mGPS) and high-sensitivity mGPS (HS-mGPS) in unresectable locally advanced esophageal squamous cell carcimona (LAESCC) patients treated with concurrent chemoradiotherapy (CCRT). The baseline data of 163 eligible patients were retrospectively collected. Patients with a C-reactive protein (CRP) ≤ 10 mg/l and albumin ≥ 35 g/l were allocated to mGPS-0 group. Patients with only elevated CRP (> 10 mg/l) were a...

  8. Resultado del proceso educativo: el papel de los estilos de aprendizaje y la personalidad

    OpenAIRE

    Santos Álvarez, María del Valle; Garrido Samaniego, María José

    2015-01-01

    En esta investigación se plantea el análisis del estilo de aprendizaje y la personalidad eficaz en una muestra de estudiantes universitarios y se analiza su posible asociación con las dimensiones de resultado del proceso educativo: rendimiento académico y satisfacción. Los resultados sugieren que el estilo predominante en los participantes es el reflexivo y que existen relaciones entre los distintos estilos. Se constata también que las dos dimensiones del resultado del proceso educativo (rend...

  9. The Integration of GPS Navigator Device with Vehicles Tracking System for Rental Cars Firms

    OpenAIRE

    Omarah O. Alharaki; Fahad S. Alaieri; Akram M. Zeki

    2010-01-01

    The aim of this research is to integrate the GPS tracking system (tracking device and web-based application) with GPS navigator for rental cars, allowing the company to use various applications to monitor and manage the cars. This is enable the firms and customers to communicate with each other via the GPS navigator. The system should be developed by applying new features in GPS tracking application devices in vehicles. This paper also proposes new features that can be applied to the GPS Navi...

  10. USO DE RECEPTORES GPS DE 100 HZ NA DETECÇÃO DE DEFLEXÕES VERTICAIS MILIMÉTRICAS DE PONTES DE CONCRETO DE PEQUENO PORTE

    Directory of Open Access Journals (Sweden)

    ANA PAULA CAMARGO LAROCCA

    Full Text Available As últimas quatro décadas foram importantes para o desenvolvimento da malha rodoviária brasileira. O país recebeu incentivos financeiros para a sua expansão e diversas soluções estruturais para pontes e viadutos foram criadas. Em paralelo a este desenvolvimento, houve nos últimos anos um crescimento significativo dessas estruturas em estágio avançado de deterioração devido à ausência de programas de manutenção preventiva. Dessa maneira, este trabalho propõe o uso de receptores GPS num plano de monitoramento de curta duração para acompanhar o comportamento estrutural de uma ponte rodoviária curva de concreto armado já em serviço. E apresenta os primeiros resultados da pesquisa com a portadora L1 do sistema GPS e dados gravados com taxa de 100 Hz, no monitoramento do vão central de ponte de concreto de pequeno porte situada sobre o Rio Jaguari, na cidade de Extrema, divisa entre os Estados de Minas Gerais e São Paulo. O desafio reside no fato de que estruturas como estas - pontes de concreto de pequeno e médio porte - respondem pela grande maioria das obras de arte da malha rodoviária brasileira e por serem estruturas rígidas, apresentam deflexões verticais pequenas, de até 5mm. O experimento foi realizado por meio de sessões de observações com receptores GPS sobre a ponte, no vão instrumentado por equipamentos convencionais para posterior confrontação de resultados entre os receptores GPS e os métodos clássicos de monitoramento. A ferramenta de filtragem Continuos Wavelet Transform (CWT foi utilizada para analisar as frequências de resposta da ponte a partir dos resíduos da dupla diferença de fase da portadora L1. A análise do espectro de energia da CWT gerado a partir dos dados coletados com os receptores GPS indicou alta concentração de energia nas mesmas faixas de frequência - de resposta do tabuleiro da ponte - apontadas pela Modelagem por Elementos Finitos e pela prova de carga dinâmica.

  11. La confederación Nacional de Estudiantes Católicos : orígenes, primeros pasos y consolidación (1920-1923

    Directory of Open Access Journals (Sweden)

    Donato Barba Prieto

    1999-01-01

    Full Text Available Dentro de la Asociación Católica Nacional de Propagandistas, fundada por el padre Ayala en los años finales de la primera década del siglo xx, se promueven diversas fórmulas de participación de los católicos en la vida pública española, una de las cuales va a ser la de los Estudiantes Católicos, cuyo ámbito será el mundo universitario, si bien intentará más adelante desarrollar también su labor en los centros de Bachillerato. Aunque la vida de la Confederación comprende los años 1920 a 1939, se recogen en este trabajo algunos aspectos de sus primeros años (1920- 1923, como su fundación en 1920, el crecimiento y desarrollo manifestado en la Primera Asamblea Confederal de Zaragoza, el enfrentamiento con otras asociaciones de estudiantes o su presencia relevante en organizaciones internacionales como Pax Romana.Several formulas of participation of Roman Catholics in public life in Spain were originated within the Catholic National Association of Propagandistas, founded by father Ayala towards the end of the first decade of twentieth century; one of such was the National Confederation of Catholic Students. The scope of this confederation was targeted primarily to the university world, but later on it was succesfully extended also to high schools. Although the life span of the Confederation comprises the years 1920 until 1939, this paper covers some aspects of the early period only (1920-1923; namely its birth in 1920, growth and development as being manifest during the First Confederal Assambly in Zaragoza; its confrontations with different students' associations, and its relevant role in International organizations, i. e. Pax Romana.

  12. La Orden Militar de Alcántara y la monarquía castellana durante los primeros Trastámaras (1369-1390

    Directory of Open Access Journals (Sweden)

    Novoa Portela, Feliciano

    2004-06-01

    Full Text Available This work tries to analyze the relations of Alcantara's order with the first two kings of the of dynasty Trastámara, concretly with Enrique II and Juan I. During this period, the Order will suffer a substantial change that is translated, on the one hand, in the purpose of his equivocal politics with the Castilian rown and, for other one, in the decrease of his institutional autonomy that has in the control of the appointment of the masters for his element more significant. All this process places inside a politics led to end for both monarches, whose aim was going to strengthen the power royal and to a progressive increase of means and of political attributions in hands of the monarchic.

    Este artículo trata de analizar las relaciones de la Orden de Alcántara con los dos primeros reyes de la dinastía Trastámara, concretamente, con Enrique II y Juan I. Durante este período, la Orden sufre un cambio sustancial que se traduce, por una parte, en el fin de su política equívoca con la Corona castellana y, por otra, en la disminución de su autonomía institucional, que tiene su elemento más significativo en el control de la designación de sus Maestres. Todo este proceso se sitúa en una política desarrollada por los dos soberanos cuyo objetivo era reforzar el poder real y el aumento

  13. Indoor/Outdoor Seamless Positioning Using Lighting Tags and GPS Cellular Phones for Personal Navigation

    Science.gov (United States)

    Namie, Hiromune; Morishita, Hisashi

    The authors focused on the development of an indoor positioning system which is easy to use, portable and available for everyone. This system is capable of providing the correct position anywhere indoors, including onboard ships, and was invented in order to evaluate the availability of GPS indoors. Although the performance of GPS is superior outdoors, there has been considerable research regarding indoor GPS involving sensitive GPS, pseudolites (GPS pseudo satellite), RFID (Radio Frequency IDentification) tags, and wireless LAN .However, the positioning rate and the precision are not high enough for general use, which is the reason why these technologies have not yet spread to personal navigation systems. In this regard, the authors attempted to implement an indoor positioning system using cellular phones with built-in GPS and infrared light data communication functionality, which are widely used in Japan. GPS is becoming increasingly popular, where GPGGS sentences of the NMEA outputted from the GPS receiver provide spatiotemporal information including latitude, longitude, altitude, and time or ECEF xyz coordinates. As GPS applications grow rapidly, spatiotemporal data becomes key to the ubiquitous outdoor and indoor seamless positioning services at least for the entire area of Japan, as well as to becoming familiar with satellite positioning systems (e.g. GPS). Furthermore, the authors are also working on the idea of using PDAs (Personal Digital Assistants), as cellular phones with built-in GPS and PDA functionality are also becoming increasingly popular.

  14. Transport on prescription: How can GPs contribute to the promotion of active transport?

    Science.gov (United States)

    Pistoll, Chance; Furler, John

    2017-10-01

    Active transport (ie walking, cycling, using public transport) can play a part in reducing non-communicable diseases (NCDs). Very little is known about how general practitioners (GPs) can contribute to promoting active transport. We explored GPs' ideas around active transport, and potential barriers and facilitators to its promotion in the clinical setting. Using a maximal variation sample, we conducted 10 semi-structured interviews with GPs in Victoria, Australia. The socioecological model informed data collection and analysis. The idea of active transport resonated with GPs. Limited awareness around active transport and safety concerns regarding commuter cycling were barriers to clinical promotion. GPs believed patients' health, cultural norms, socioeconomic position and access to supportive environments could facilitate participation. Future efforts should prioritise awareness of active transport among GPs. The perspectives of GPs would be valuable to policymakers, particularly in designing programs to mitigate inequalities around active transport access and use.

  15. Gastrosquisis: resultados en una institución de tercer nivel

    Directory of Open Access Journals (Sweden)

    A.J. Machuca Vaca

    2017-06-01

    Conclusión: La gastrosquisis es un defecto de pared abdominal frecuente que debe tratarse por un equipo multidisciplinario en una hospital de tercer nivel de atención. Nuestros resultados son comparables con la literatura internacional.

  16. Uav Onboard Photogrammetry and GPS Positionning for Earthworks

    Science.gov (United States)

    Daakir, M.; Pierrot-Deseilligny, M.; Bosser, P.; Pichard, F.; Thom, C.

    2015-08-01

    Over the last decade, Unmanned Airbone Vehicles (UAVs) have been largely used for civil applications. Airborne photogrammetry has found place in these applications not only for 3D modeling but also as a measurement tool. Vinci-Construction-Terrassement is a private company specialized in public works sector and uses airborn photogrammetry as a mapping solution and metrology investigation tool on its sites. This technology is very efficient for the calculation of stock volumes for instance, or for time tracking of specific areas with risk of landslides. The aim of the present work is to perform a direct georeferencing of images acquired by the camera leaning on an embedded GPS receiver. UAV, GPS receiver and camera used are low-cost models and therefore data processing is adapted to this particular constraint.

  17. Tutorial GPS I programmi TGO e TTC di Trimble

    Directory of Open Access Journals (Sweden)

    Vittorio Grassi

    2005-10-01

    Full Text Available Sia questo articolo che quelli che seguiranno sui più diffusi programmi di elaborazione dei dati GPS circolanti in Italia, non pretendono d’essere ne’ saranno mai un manuale d’uso. Il loro scopo è quello di mettere in risalto le funzionalità del programma recensito sulla base di quanto esposto nell’articolo dello stesso autore, intitolato “L’elaborazione dei dati GPS” e pubblicato sul n° 2 di Geomedia 2005 ed è quindi visto solo sotto l’aspetto della elaborazione dei dati GPS e della loro compensazione.

  18. Global optimization applied to GPS positioning by ambiguity functions

    International Nuclear Information System (INIS)

    Baselga, Sergio

    2010-01-01

    Differential GPS positioning with carrier-phase observables is commonly done in a process that involves determination of the unknown integer ambiguity values. An alternative approach, named the ambiguity function method, was already proposed in the early days of GPS positioning. By making use of a trigonometric function ambiguity unknowns are eliminated from the functional model before the estimation process. This approach has significant advantages, such as ease of use and insensitivity to cycle slips, but requires such high accuracy in the initial approximate coordinates that its use has been practically dismissed from consideration. In this paper a novel strategy is proposed so that the need for highly accurate initial coordinates disappears: the application of a global optimization method to the ambiguity functions model. The use of this strategy enables the ambiguity function method to compete with the present prevailing approach of ambiguity resolution

  19. A transportation security system applying RFID and GPS

    Directory of Open Access Journals (Sweden)

    Ruijian Zhang

    2013-03-01

    Full Text Available Purpose: This paper is about developing a centralized, internet based security tool which utilizes RFID and GPS technology to identify drivers and track the load integrity. Design/methodology/approach: The system will accomplish the security testing in real-time using the internet and the U.S. Customs’ database (ACE. A central database and the interfaces and communication between the database and ACE will be established. After the vehicle is loaded, all openings of the tanker are sealed with disposable RFID tag seals. Findings/value: An RFID reader and GPS tracker wirelessly connected with the databases will serve as testing grounds for the implementation of security measures that can help prevent future terrorist attacks and help in ensuring that the goods and products are not compromised while in transit. The system will also reduce the labor work of security check to its minimum. 

  20. Adaptive Federal Kalman Filtering for SINS/GPS Integrated System

    Institute of Scientific and Technical Information of China (English)

    杨勇; 缪玲娟

    2003-01-01

    A new adaptive federal Kalman filter for a strapdown integrated navigation system/global positioning system (SINS/GPS) is given. The developed federal Kalman filter is based on the trace operation of parameters estimation's error covariance matrix and the spectral radius of update measurement noise variance-covariance matrix for the proper choice of the filter weight and hence the filter gain factors. Theoretical analysis and results from simulation in which the SINS/GPS was compared to conventional Kalman filter are presented. Results show that the algorithm of this adaptive federal Kalman filter is simpler than that of the conventional one. Furthermore, it outperforms the conventional Kalman filter when the system is undertaken measurement malfunctions because of its possession of adaptive ability. This filter can be used in the vehicle integrated navigation system.

  1. Smartphone-based integrated PDR/GPS/Bluetooth pedestrian location

    Science.gov (United States)

    Li, Xianghong; Wei, Dongyan; Lai, Qifeng; Xu, Ying; Yuan, Hong

    2017-02-01

    Typical indoor location method is fingerprint and traditional outdoor location system is GPS. Both of them are of poor accuracy and limited only for indoor or outdoor environments. As the smartphones are equipped with MEMS sensors, it means PDR can be widely used. In this paper, an algorithm of smartphone-based integrated PDR/GPS/Bluetooth for pedestrian location in the indoor/outdoor is proposed, which can be highly expected to realize seamless indoor/outdoor localization of the pedestrian. In addition, we also provide technologies to estimate orientation with Magnetometer and Gyroscope and detect context with output of sensors. The extensive experimental results show that the proposed algorithm can realize seamless indoor/outdoor localization.

  2. Seamless Guidance System Combining GPS, BLE Beacon, and NFC Technologies

    Directory of Open Access Journals (Sweden)

    Rung-Shiang Cheng

    2016-01-01

    Full Text Available Users rely increasingly on Location-Based Services (LBS and automated navigation/guidance systems nowadays. However, while such services are easily implemented in outdoor environments using Global Positioning System (GPS technology, a requirement still exists for accurate localization and guidance schemes in indoor settings. Accordingly, the present study proposes a system based on GPS, Bluetooth Low Energy (BLE beacons, and Near Field Communication (NFC technology. Through establishing graphic information and the design of algorithm, this study develops a guidance system for indoors and outdoors on smart phones, wishing to give user perfect smart life through this system. The proposed system is implemented on a smart phone and evaluated on a student campus environment. The experimental results confirm the ability of the proposed app to switch automatically from an outdoor mode to an indoor mode and to guide the user to requested target destination via the shortest possible route.

  3. Central and South America GPS geodesy - CASA Uno

    Science.gov (United States)

    Kellogg, James N.; Dixon, Timothy H.

    1990-01-01

    In January 1988, scientists from over 25 organizations in 13 countries and territories cooperated in the largest GPS campaign in the world to date. A total of 43 GPS receivers collected approximately 590 station-days of data in American Samoa, Australia, Canada, Colombia, Costa Rica, Ecuador, New Zealand, Norway, Panama, Sweden, United States, West Germany, and Venezuela. The experiment was entitled CASA Uno. Scientific goals of the project include measurements of strain in the northern Andes, subduction rates for the Cocos and Nazca plates beneath Central and South America, and relative motion between the Caribbean plate and South America. A second set of measurements are planned in 1991 and should provide preliminary estimates of crustal deformation and plate motion rates in the region.

  4. A GPS-Based Decentralized Control Method for Islanded Microgrids

    DEFF Research Database (Denmark)

    Golsorkhi, Mohammad; Lu, Dylan; Guerrero, Josep M.

    2017-01-01

    Coordinated control of distributed energy resources (DER) is essential for the operation of islanded microgrids (MGs). Conventionally, such coordination is achieved by drooping the frequency of the reference voltage versus active (or reactive) power. The conventional droop method ensures synchron......Coordinated control of distributed energy resources (DER) is essential for the operation of islanded microgrids (MGs). Conventionally, such coordination is achieved by drooping the frequency of the reference voltage versus active (or reactive) power. The conventional droop method ensures......, GPS timing technology is utilized to synchronize the DERs to a common reference frame, rotating at nominal frequency. In addition, an adaptive Q-f droop controller is introduced as a backup to ensure stable operation during GPS signal interruptions. In the context of the common reference frame, even...

  5. Understanding quit decisions in primary care: a qualitative study of older GPs.

    Science.gov (United States)

    Sansom, Anna; Calitri, Raff; Carter, Mary; Campbell, John

    2016-02-19

    To investigate the reasons behind intentions to quit direct patient care among experienced general practitioners (GPs) aged 50-60 years. Qualitative study based on semistructured interviews with GPs in the South West region of England. Transcribed interviews were analysed thematically. 23 GPs aged 50-60 years: 3 who had retired from direct patient care before age 60, and 20 who intended to quit direct patient care within the next 5 years. The analysis identified four key themes: early retirement is a viable option for many GPs; GPs have employment options other than undertaking direct patient care; GPs report feeling they are doing an (almost) undoable job; and GPs may have other aspirations that pull them away from practice. Findings from this study confirmed those from earlier research, with high workload, ageing and health, family and domestic life, and organisational change all influencing GPs' decisions about when to retire/quit direct patient care. However, in addition, GPs expressed feelings of insecurity and uncertainty regarding the future of general practice, low morale, and issues regarding accountability (appraisal and revalidation) and governance. Suggestions about how to help retain GPs within the active clinical workforce were offered, covering individual, practice and organisational levels. This research highlights aspects of the current professional climate for GPs that are having an impact on retirement decisions. Any future changes to policy or practice to help retain experienced GPs will benefit from this informed understanding of GPs' views. Key factors to take into account include: making the GP workload more manageable; managing change sympathetically; paying attention to GPs' own health; improving confidence in the future of general practice; and improving GP morale. Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/

  6. EL VALOR INFORMATIVO DE LOS ESTUDIOS INTERNACIONALES COMPARADOS DE RENDIMIENTO ESCOLAR: DATOS Y PRIMEROS INTENTOS DE INTERPRETACIÓN SOBRE LA BASE DEL ESTUDIO PISA

    Directory of Open Access Journals (Sweden)

    Eckhard Klieme

    2009-01-01

    Full Text Available Partiendo de la reciente bibliografía acerca de TIMSS y de los nuevos datos de PISA, el presente trabajo se propone discutir algunos aspectos básicos de la investigación empírica comparada en materia de educación. Se sostiene que los objetivos primarios de las evaluaciones de rendimiento a gran escala son: (a operacionalizar de las metas educativas y las competencias de los alumnos, (b establecer modelos causales que sirvan para explicar los resultados del sistema escolar y (c brindar una descripción de la eficacia de los sistemas e instituciones educativas. En los análisis comparados, se hace uso de un conjunto de indicadores que definen minuciosamente el perfil de los resultados a nivel nacional. Sin embargo, la interpretación y explicación de las diferencias en el plano internacional adolece todavía de problemas teóricos y metodológicos considerables. Ello es así porque la investigación empírica apenas está comenzando a entender la repercusión que tiene el contexto cultural en los resultados escolares.

  7. Primeros ensayos para el cultivo y caracterización del aceite esencial de Conobea scoparioides (Cham. & Schltdl. Benth. para el Pacífico colombiano

    Directory of Open Access Journals (Sweden)

    Robert Tulio González Mina

    2010-01-01

    Full Text Available Conobea scoparioides (Cham. & Schltdl. Benth. es una planta silvestre de humedales de la que no hay antecedentes de su cultivo o domesticación. El presente trabajo intenta obtener resultados preliminares para su reproducción en condiciones experimentales de siembras simulando su entorno natural contrastada con siembras en materas. Como se ha reportado previamente interés por esta especie como fuente de aceites esenciales ricos en timol, sustancia valiosa de uso industrial y medicinal, se analiza la composición cromatográfica de los volátiles para una población local. Se enuncia un nuevo quimiotipo para el aceite esencial de C. scoparioides procedente de los humedales del Pacífico colombiano. Se presentan los resultados de los ensayos sobre la reproducción vegetativa y por semillas de la especie en cuestión, aunque los resultados reproductivos indican un limitado potencial agrícola para esta especie.

  8. Primeros ensayos para el cultivo y caracterización del aceite esencial de Conobea scoparioides (Cham. & Schltdl. Benth. para el Pacífico colombiano

    Directory of Open Access Journals (Sweden)

    Robert Tulio González Mina

    2011-01-01

    Full Text Available Conobea scoparioides (Cham. & Schltdl. Benth. es una planta silvestre de humedales de la que no hay antecedentes de su cultivo o domesticación. El presente trabajo intenta obtener resultados preliminares para su reproducción en condiciones experimentales de siembras simulando su entorno natural contrastada con siembras en materas. Como se ha reportado previamente interés por esta especie como fuente de aceites esenciales ricos en timol, sustancia valiosa de uso industrial y medicinal, se analiza la composición cromatográfica de los volátiles para una población local. Se enuncia un nuevo quimiotipo para el aceite esencial de C. scoparioides procedente de los humedales del Pacífico colombiano. Se presentan los resultados de los ensayos sobre la reproducción vegetativa y por semillas de la especie en cuestión, aunque los resultados reproductivos indican un limitado potencial agrícola para esta especie.

  9. Note to remote control of GPS observatory using GSM modem

    Czech Academy of Sciences Publication Activity Database

    Kottnauer, Pavel; Rucký, A.; Schenk, Vladimír; Schenková, Zdeňka

    24(131) (2003), s. 163-165 ISSN 1211-1910. [Czech-Polish Workshop on Recent Geodynamics of the Sudety Mts. and Adjacent Areas/4./. Lubawka, 07.11.2002-09.11.2002] R&D Projects: GA MŠk LN00A005 Institutional research plan: CEZ:AV0Z3046908 Keywords : GPS measurement * remote control Subject RIV: DB - Geology ; Mineralogy

  10. Methodology for GPS Synchronization Evaluation with High Accuracy

    OpenAIRE

    Li Zan; Braun Torsten; Dimitrova Desislava

    2015-01-01

    Clock synchronization in the order of nanoseconds is one of the critical factors for time based localization. Currently used time synchronization methods are developed for the more relaxed needs of network operation. Their usability for positioning should be carefully evaluated. In this paper we are particularly interested in GPS based time synchronization. To judge its usability for localization we need a method that can evaluate the achieved time synchronization with nanosecond accuracy. Ou...

  11. Methodology for GPS Synchronization Evaluation with High Accuracy

    OpenAIRE

    Li, Zan; Braun, Torsten; Dimitrova, Desislava Cvetanova

    2015-01-01

    Clock synchronization in the order of nanoseconds is one of the critical factors for time-based localization. Currently used time synchronization methods are developed for the more relaxed needs of network operation. Their usability for positioning should be carefully evaluated. In this paper, we are particularly interested in GPS-based time synchronization. To judge its usability for localization we need a method that can evaluate the achieved time synchronization with nanosecond accuracy. O...

  12. Non-traditional approaches to teaching GPS online

    Science.gov (United States)

    Matias, A.; Wolf, D. F., II

    2009-12-01

    Students are increasingly turning to the web for quality education that fits into their lives. Nonetheless, online learning brings challenges as well as a fresh opportunity for exploring pedagogical practices not present on traditional higher education programs, particularly in the sciences. A team of two dozen Empire State College-State University of New York instructional designers, faculty, and other staff are working on making science relevant to non-majors who may initially have anxiety about general education science courses. One of these courses, GPS and the New Geography, focuses on how Global Positioning System (GPS) technology provides a base for inquiry and scientific discovery from a range of environmental issues with local, regional, and global scope. GPS and the New Geography is an introductory level course developed under a grant supported by the Charitable Leadership Foundation. Taking advantage of the proliferation of tools currently available for online learning management systems, we explore current trends in Web 2.0 applications to aggregate and leverage data to create a nontraditional, interactive learning environment. Using our best practices to promote on-line discussion and interaction, these tools help engage students and foster deep learning. During the 15-week term students learn through case studies, problem-based exercises, and the use of scientific data; thus, expanding their spatial literacy and gain experience using real spatial technology tools to enhance their understanding of real-world issues. In particular, we present how the use of Mapblogs an in-house developed blogging platform that uses GIS interplaying with GPS units, interactive data presentations, intuitive visual working environments, harnessing RSS feeds, and other nontraditional Web 2.0 technology has successfully promoted active learning in the virtual learning environment.

  13. A variational regularization of Abel transform for GPS radio occultation

    OpenAIRE

    T.-K. Wee

    2018-01-01

    In the Global Positioning System (GPS) radio occultation (RO) technique, the inverse Abel transform of measured bending angle (Abel inversion, hereafter AI) is the standard means of deriving the refractivity. While concise and straightforward to apply, the AI accumulates and propagates the measurement error downward. The measurement error propagation is detrimental to the refractivity in lower altitudes. In particular, it builds up negative refractivity bias in the tropical ...

  14. A New Trajectory Similarity Measure for GPS Data

    KAUST Repository

    Ismail, Anas; Vigneron, Antoine E.

    2016-01-01

    We present a new algorithm for measuring the similarity between trajectories, and in particular between GPS traces. We call this new similarity measure the Merge Distance (MD). Our approach is robust against subsampling and supersampling. We perform experiments to compare this new similarity measure with the two main approaches that have been used so far: Dynamic Time Warping (DTW) and the Euclidean distance. © 2015 ACM.

  15. Norwegians GPs' use of electronic patient record systems.

    Science.gov (United States)

    Christensen, Tom; Faxvaag, Arild; Loerum, Hallvard; Grimsmo, Anders

    2009-12-01

    To evaluate GPs use of three major electronic patient record systems with emphasis on the ability of the systems to support important clinical tasks and to compare the findings with results from a study of the three major hospital-wide systems. A national, cross-sectional questionnaire survey was conducted in Norwegian primary care. 247 (73%) of 338 GPs responded. Proportions of the respondents who reported to use the EPR system to conduct 23 central clinical tasks, differences in the proportions of users of different EPR systems and user satisfaction and perceived usefulness of the EPR system were measured. The GPs reported extensive use of their EPR systems to support clinical tasks. There were no significant differences in functionality between the systems, but there were differences in reported software and hardware dysfunction and user satisfaction. The respondents reported high scores in computer literacy and there was no correlation between computer usage and respondent age or gender. A comparison with hospital physicians' use of three hospital-wide EPR systems revealed that GPs had higher usage than the hospital-based MDs. Primary care EPR systems support clinical tasks far better than hospital systems with better overall user satisfaction and reported impact on the overall quality of the work. EPR systems in Norwegian primary care that have been developed in accordance with the principles of user-centered design have achieved widespread adoption and highly integrated use. The quality and efficiency of the clinical work has increased in contrast to the situation of their hospital colleagues, who report more modest use and benefits of EPR systems.

  16. GPs' negotiation strategies regarding sick leave for subjective health complaints.

    Science.gov (United States)

    Nilsen, Stein; Malterud, Kirsti; Werner, Erik L; Maeland, Silje; Magnussen, Liv Heide

    2015-03-01

    To explore general practitioners' (GPs') specific negotiation strategies regarding sick-leave issues with patients suffering from subjective health complaints. Focus-group study. Nine focus-group interviews in three cities in different regions of Norway. 48 GPs (31 men, 17 women; age 32-65), participating in a course dealing with diagnostic practice and assessment of sickness certificates related to patients with subjective health complaints. The GPs identified some specific strategies that they claimed to apply when dealing with the question of sick leave for patients with subjective health complaints. The first step would be to build an alliance with the patient by complying with the wish for sick leave, and at the same time searching for information to acquire the patient's perspective. This position would become the basis for the main goal: motivating the patient for a rapid return to work by pointing out the positive effects of staying at work, making legal and moral arguments, and warning against long-term sick leave. Additional solutions might also be applied, such as involving other stakeholders in this process to provide alternatives to sick leave. GPs seem to have a conscious approach to negotiations of sickness certification, as they report applying specific strategies to limit the duration of sick leave due to subjective health complaints. This give-and-take way of handling sick-leave negotiations has been suggested by others to enhance return to work, and should be further encouraged. However, specific effectiveness of this strategy is yet to be proven, and further investigation into the actual dealings between doctor and patients in these complex encounters is needed.

  17. Assessing GPS Constellation Resiliency in an Urban Canyon Environment

    Science.gov (United States)

    2015-03-26

    ABMS ) is used to model complex adaptive systems (CAS) potentially made up of many different types of agents. North & Macal [25] state that, “Agent-based...modeling and simulation ( ABMS ) is founded on the notion that the whole of many systems or organizations is greater than the simple sum of its...satellite systems is challenging the capabilities provided by space assets. More specifically, the global positioning system (GPS) satellite

  18. A New Trajectory Similarity Measure for GPS Data

    KAUST Repository

    Ismail, Anas

    2016-08-08

    We present a new algorithm for measuring the similarity between trajectories, and in particular between GPS traces. We call this new similarity measure the Merge Distance (MD). Our approach is robust against subsampling and supersampling. We perform experiments to compare this new similarity measure with the two main approaches that have been used so far: Dynamic Time Warping (DTW) and the Euclidean distance. © 2015 ACM.

  19. Ionospheric threats to the integrity of airborne GPS users

    Science.gov (United States)

    Datta-Barua, Seebany

    The Global Positioning System (GPS) has both revolutionized and entwined the worlds of aviation and atmospheric science. As the largest and most unpredictable source of GPS positioning error, the ionospheric layer of the atmosphere, if left unchecked, can endanger the safety, or "integrity," of the single frequency airborne user. An augmentation system is a differential-GPS-based navigation system that provides integrity through independent ionospheric monitoring by reference stations. However, the monitor stations are not in general colocated with the user's GPS receiver. The augmentation system must protect users from possible ionosphere density variations occurring between its measurements and the user's. This study analyzes observations from ionospherically active periods to identify what types of ionospheric disturbances may cause threats to user safety if left unmitigated. This work identifies when such disturbances may occur using a geomagnetic measure of activity and then considers two disturbances as case studies. The first case study indicates the need for a non-trivial threat model for the Federal Aviation Administration's Local Area Augmentation System (LAAS) that was not known prior to the work. The second case study uses ground- and space-based data to model an ionospheric disturbance of interest to the Federal Aviation Administration's Wide Area Augmentation System (WAAS). This work is a step in the justification for, and possible future refinement of, one of the WAAS integrity algorithms. For both WAAS and LAAS, integrity threats are basically caused by events that may be occurring but are unobservable. Prior to the data available in this solar cycle, events of such magnitude were not known to be possible. This work serves as evidence that the ionospheric threat models developed for WARS and LAAS are warranted and that they are sufficiently conservative to maintain user integrity even under extreme ionospheric behavior.

  20. Directional Networking in GPS Denied Environments - Time Synchronization

    Science.gov (United States)

    2016-03-14

    RF-based measurements to synchronize time and measure node range.  Satellite Doppler: Using Doppler measurements from multiple satellites along...with satellite catalog data to determine time and position.  LTE : Use existing LTE base-stations for time and position.  Differential GPS: A...Opportunistic Signals: Opportunistically take advantage of existing RF signals (i.e., FM radio, DTV, LTE , etc.) transmitted from known locations

  1. Comparison of GPS and GLONASS Common-View Time Transfers

    Science.gov (United States)

    1992-12-01

    interest as an excellent additional source. For the past three years VNIIFTRI (Mendeleevo, Moscow Region, Russian Federation) and some other Russian time...Standard Form 298 (Rev. 8-98) Prescribed by ANSI Std Z39-18 comparisons. Since June 1991, VNIIFTRI has operated a commercial GPS time receiver on...loan from the BIPM. Since February 1992, the BIPM has operated Russian GLONASS receiver on loan from the VNIIFTRI . Thii provides, for the first time

  2. Application of Seasonal Trend Loess to GPS data in Cascadia

    Science.gov (United States)

    Bal, A.; Bartlow, N. M.

    2016-12-01

    Plate Boundary Observatory GPS stations provide crucial data for the study of slow slip events and volcanic hazards in the Cascadia region. However, these GPS stations also record seasonal changes in deformation caused by hydrologic, atmospheric, and other seasonal loading. Removing these signals is necessary for accurately modeling the tectonic sources of deformation. Traditionally, seasonal trends in data been accounted for by fitting and removing sine curves from the data. However, not all seasonal trends follow a sinusoidal shape. Seasonal Trend Loess, or STL, is a filtering procedure for a decomposing a time series into trend, seasonal, and remainder components (Cleveland et. al, Journal of Official Statistics, 1990). STL has a simple design that consists of a sequence of applications of the loess smoother which allows for fast computation of large amounts of trend and seasonal smoothing. STL allows for non-sinusoidal shapes in seasonal deformation signals, and allows for evolution of seasonal signals over time. We applied Seasonal Trend Loess to GPS data from the Cascadia region. We compared our results to a traditional sine wave fit for seasonal removal at selected stations, including stations with slow slip event and volcanic signals. We hope that the STL method may be able to more accurately differentiate seasonal and tectonic deformation signals.

  3. Clustering of GPS velocities in the Mojave Block, southeastern California

    Science.gov (United States)

    Savage, James C.; Simpson, Robert W.

    2013-01-01

    We find subdivisions within the Mojave Block using cluster analysis to identify groupings in the velocities observed at GPS stations there. The clusters are represented on a fault map by symbols located at the positions of the GPS stations, each symbol representing the cluster to which the velocity of that GPS station belongs. Fault systems that separate the clusters are readily identified on such a map. The most significant representation as judged by the gap test involves 4 clusters within the Mojave Block. The fault systems bounding the clusters from east to west are 1) the faults defining the eastern boundary of the Northeast Mojave Domain extended southward to connect to the Hector Mine rupture, 2) the Calico-Paradise fault system, 3) the Landers-Blackwater fault system, and 4) the Helendale-Lockhart fault system. This division of the Mojave Block is very similar to that proposed by Meade and Hager. However, no cluster boundary coincides with the Garlock Fault, the northern boundary of the Mojave Block. Rather, the clusters appear to continue without interruption from the Mojave Block north into the southern Walker Lane Belt, similar to the continuity across the Garlock Fault of the shear zone along the Blackwater-Little Lake fault system observed by Peltzer et al. Mapped traces of individual faults in the Mojave Block terminate within the block and do not continue across the Garlock Fault [Dokka and Travis, ].

  4. Estimating maneuvers for precise relative orbit determination using GPS

    Science.gov (United States)

    Allende-Alba, Gerardo; Montenbruck, Oliver; Ardaens, Jean-Sébastien; Wermuth, Martin; Hugentobler, Urs

    2017-01-01

    Precise relative orbit determination is an essential element for the generation of science products from distributed instrumentation of formation flying satellites in low Earth orbit. According to the mission profile, the required formation is typically maintained and/or controlled by executing maneuvers. In order to generate consistent and precise orbit products, a strategy for maneuver handling is mandatory in order to avoid discontinuities or precision degradation before, after and during maneuver execution. Precise orbit determination offers the possibility of maneuver estimation in an adjustment of single-satellite trajectories using GPS measurements. However, a consistent formulation of a precise relative orbit determination scheme requires the implementation of a maneuver estimation strategy which can be used, in addition, to improve the precision of maneuver estimates by drawing upon the use of differential GPS measurements. The present study introduces a method for precise relative orbit determination based on a reduced-dynamic batch processing of differential GPS pseudorange and carrier phase measurements, which includes maneuver estimation as part of the relative orbit adjustment. The proposed method has been validated using flight data from space missions with different rates of maneuvering activity, including the GRACE, TanDEM-X and PRISMA missions. The results show the feasibility of obtaining precise relative orbits without degradation in the vicinity of maneuvers as well as improved maneuver estimates that can be used for better maneuver planning in flight dynamics operations.

  5. GPS pro výukovou HW/SW platformu

    OpenAIRE

    Pajgrt, Ondřej

    2008-01-01

    Práce se zabývá popisem spojení výukové platformy FITkit s GPS modulem. Seznámíme se v ní s problematikou systému GPS z teoretického i praktického hlediska, s výukovou platformou FITkit a jejím obecným využitím.Také podrobně popisuje spojení těchto dvou systémů ve spolupracující celek. Rozebírá též různé komunikační rozhraní a protokoly, které byly pro toto spojení využity. Ve druhé části práce je pak uveden postup zpracovávání dat od GPS modulu až po výsledné zobrazení na monitoru, samotná i...

  6. The Effect of high temperature plasma on GPS satellite signals

    International Nuclear Information System (INIS)

    Aghanajafi, C.; Alizadeh, M.M.

    2002-01-01

    Ionospheric disturbances caused by pulses of electromagnetic radiation are observed in the propagation of radio signals. Specific events affecting particular aspects of radio propagation are sudden phase anomaly; sudden frequency deviation, sudden cosmic noise and short wave fade out. Global positioning System (GPS) is a space-based navigation system, developed by the United States, to satisfy the requirements for the military forces and the civilians to determine their position, velocity and time in a common reference system anywhere on or near the earth. The purpose of this paper is to calculate the effect of ionosphere on GPS satellite signals. In order to find this effects, calculation of the total column electron content is needed. The lack of data necessary to generate real Electron Density Profile versus altitude, latitude, time, season and solar activity; causes the introduction of a new method to reproduce the topside and bottom side component of the peak electron density. Electron density profiles computed in this method are compared with GPS derived profiles, which use observations of dual frequency receivers. Ionospheric range corrections, for signal point positioning, using two methods have also been discussed

  7. GPS sledovací systém

    OpenAIRE

    Hofman, Jan

    2010-01-01

    V práci je popsán základní princip a vlastnosti globálního pozičního systému GPS. Je zde přiblížena problematika určování polohy, rychlosti a nadmořské výšky. Tyto poznatky jsou dále použity pro návrh zařízení, které komunikuje s běžně vyráběným GPS přijímačem a z něj získané informace zpracovává a ukládá do paměti pro pozdější vyhodnocení The keystone and properties of Global Position System (GPS) are described in this thesis. The thesis explains questions of position, speed and elevation...

  8. GPS sekošanas sistēma

    OpenAIRE

    Striževskis, Andrejs

    2011-01-01

    Šajā darbā ir izskatītas GPS sekošanas iespējas privātās lietošanas sfērā, aprakstītas kartogrāfijas un navigācijas teorētisko pamatu izvēlētās nodaļas un piedāvāts bezmaksas risinājums, kas dod iespēju izmantot sekošanai GPS ierīces ar datora palīdzību un interneta pieslēgumu bez papildus servisiem, kā arī veidot tam nolūkam navigācijas kartes, piesaistot rastra attēlus Zemes ģeogrāfisko koordinātu sistēmai ar polinomiālās transformācijas palīdzību. Atslēgvārdi: GPS sekošana, GIS, navigāc...

  9. GPS time series at Campi Flegrei caldera (2000-2013

    Directory of Open Access Journals (Sweden)

    Prospero De Martino

    2014-05-01

    Full Text Available The Campi Flegrei caldera is an active volcanic system associated to a high volcanic risk, and represents a well known and peculiar example of ground deformations (bradyseism, characterized by intense uplift periods, followed by subsidence phases with some episodic superimposed mini-uplifts. Ground deformation is an important volcanic precursor, and, its continuous monitoring, is one of the main tool for short time forecast of eruptive activity. This paper provides an overview of the continuous GPS monitoring of the Campi Flegrei caldera from January 2000 to July 2013, including network operations, data recording and processing, and data products. In this period the GPS time series allowed continuous and accurate tracking of ground deformation of the area. Seven main uplift episodes were detected, and during each uplift period, the recurrent horizontal displacement pattern, radial from the “caldera center”, suggests no significant change in deformation source geometry and location occurs. The complete archive of GPS time series at Campi Flegrei area is reported in the Supplementary materials. These data can be usefull for the scientific community in improving the research on Campi Flegrei caldera dynamic and hazard assessment.

  10. Performance evaluation of GPS receiver under equatorial scintillation

    Directory of Open Access Journals (Sweden)

    Alison de Oliveira Moraes

    2009-06-01

    Full Text Available Equatorial scintillation is a phenomenon that occurs daily in the equatorial region after the sunset and affects radio signals that propagate through the ionosphere. Depending on the temporal and spatial situation, equatorial scintillation can represent a problem in the availability and precision of the Global Positioning System (GPS. This work is concerned with evaluating the impact of equatorial scintillation on the performance of GPS receivers. First, the morphology and statistical model of equatorial scintillation is briefly presented. A numerical model that generates synthetic scintillation data to simulate the effects of equatorial scintillation is presented. An overview of the main theoretical principles on GPS receivers is presented. The analytical models that describe the effects of scintillation at receiver level are presented and compared with numerical simulations using a radio software receiver and synthetic data. The results achieved by simulation agreed quite well with those predicted by the analytical models. The only exception is for links with extreme levels of scintillation and when weak signals are received.

  11. Comparison of the precision of three commonly used GPS models

    Directory of Open Access Journals (Sweden)

    E Chavoshi

    2016-04-01

    Full Text Available Introduction: Development of science in various fields has caused change in the methods to determine geographical location. Precision farming involves new technology that provides the opportunity for farmers to change in factors such as nutrients, soil moisture available to plants, soil physical and chemical characteristics and other factors with the spatial resolution of less than a centimeter to several meters to monitor and evaluate. GPS receivers based on precision farming operations specified accuracies are used in the following areas: 1 monitoring of crop and soil sampling (less than one meter accuracy 2 use of fertilizer, pesticide and seed work (less than half a meter accuracy 3 Transplantation and row cultivation (precision of less than 4 cm (Perez et al., 2011. In one application of GPS in agriculture, route guidance precision farming tractors in the fields was designed to reduce the transmission error that deviate from the path specified in the range of 50 to 300 mm driver informed and improved way to display (Perez et al., 2011. In another study, the system automatically guidance, based on RTK-GPS technology, precision tillage operations was used between and within the rows very close to the drip irrigation pipe and without damage to their crops at a distance of 50 mm (Abidine et al., 2004. In another study, to compare the accuracy and precision of the receivers, 5 different models of Trimble Mark GPS devices from 15 stations were mapped, the results indicated that minimum error was related to Geo XT model with an accuracy of 91 cm and maximum error was related to Pharos model with an accuracy of 5.62 m (Kindra et al., 2006. Due to the increasing use of GPS receivers in agriculture as well as the lack of trust on the real accuracy and precision of receivers, this study aimed to compare the positioning accuracy and precision of three commonly used GPS receivers models used to specify receivers with the lowest error for precision

  12. Apoyo a Estudios Geodinamicos con GPS en Guatemala

    Science.gov (United States)

    Robles, V. R.

    2013-05-01

    El Instituto Geografico Nacional de Guatemala implemento 17 estaciones GNSS en el año 2009, como un proyecto de credito mixto de donacion de equipamiento del Gobierno de Suiza, el cual, este equipamiento de estaciones CORS GNSS es un sistema de recepción y transmisión de datos crudos GPS RInex que utiliza la tecnologia Spider Web de Leica, asi mismo este sistema esta sirviendo para el espablecimiento de un marco geodesico nacional de coordenadas geodesicas oficiales, el cual se calculan u obtienen las velocidades en tiempos temporales programados de las 17 Estaciones CORS. La infraestructura del marco geodesico de Guatemala esta sirviendo de base para las aplicaciones de estudios geodinamicos como el monitoreo de del desplazamiento de las placas tectonicas por medio de un estudio que se inicio en el año de 1999, llamado medicion con GPS el sistema de Fallas de los rios Polochic Motagua de Guatemala, tambien para un estudio que se implemento para deformación de corteza terrestre local en un Volcan Activo de Guatemala llamado Pacaya. Para el estudio de medicion con GPS en el sistema de falla de los Rios del polochic Motagua se implementaron 16 puntos para medir con GPS de dos frecuencias en el año de 1999, el cual, tres puntos son estaciones geodesicas CORS IGS llamados GUAT, ELEN y HUEH, despues en el año de 2003 se hizo otra medicion en un total de 20 puntos, que permitió calcular las velocidades de desplazamieinto de los puntos en mención, usando como referencia el modelo NUVEL 1A de DeMets de la placa de Norteamerica. Este estudio fue en cooperación internacional por la universidad de Nice de Francia y el IGNde Francia. Para el estudio del monitoreo con GPS del volcan activo de Guatemala, se implementaron cuatro puntos al rededor del volcan, el cual, se realizan cuatro mediciones al año, que permiten determinar axialmente la distancias entre los puntos, y rebisar estadisticamente cual es el comportamiento de las distancias en funcion del tiempo, si

  13. GPS coordinate time series measurements in Ontario and Quebec, Canada

    Science.gov (United States)

    Samadi Alinia, Hadis; Tiampo, Kristy F.; James, Thomas S.

    2017-06-01

    New precise network solutions for continuous GPS (cGPS) stations distributed in eastern Ontario and western Québec provide constraints on the regional three-dimensional crustal velocity field. Five years of continuous observations at fourteen cGPS sites were analyzed using Bernese GPS processing software. Several different sub-networks were chosen from these stations, and the data were processed and compared to in order to select the optimal configuration to accurately estimate the vertical and horizontal station velocities and minimize the associated errors. The coordinate time series were then compared to the crustal motions from global solutions and the optimized solution is presented here. A noise analysis model with power-law and white noise, which best describes the noise characteristics of all three components, was employed for the GPS time series analysis. The linear trend, associated uncertainties, and the spectral index of the power-law noise were calculated using a maximum likelihood estimation approach. The residual horizontal velocities, after removal of rigid plate motion, have a magnitude consistent with expected glacial isostatic adjustment (GIA). The vertical velocities increase from subsidence of almost 1.9 mm/year south of the Great Lakes to uplift near Hudson Bay, where the highest rate is approximately 10.9 mm/year. The residual horizontal velocities range from approximately 0.5 mm/year, oriented south-southeastward, at the Great Lakes to nearly 1.5 mm/year directed toward the interior of Hudson Bay at stations adjacent to its shoreline. Here, the velocity uncertainties are estimated at less than 0.6 mm/year for the horizontal component and 1.1 mm/year for the vertical component. A comparison between the observed velocities and GIA model predictions, for a limited range of Earth models, shows a better fit to the observations for the Earth model with the smallest upper mantle viscosity and the largest lower mantle viscosity. However, the

  14. Interaction between subdaily Earth rotation parameters and GPS orbits

    Science.gov (United States)

    Panafidina, Natalia; Seitz, Manuela; Hugentobler, Urs

    2013-04-01

    In processing GPS observations the geodetic parameters like station coordinates and ERPs (Earth rotation parameters) are estimated w.r.t. the celestial reference system realized by the satellite orbits. The interactions/correlations between estimated GPS orbis and other parameters may lead to numerical problems with the solution and introduce systematic errors in the computed values: the well known correlations comprise 1) the correlation between the orbital parameters determining the orientation of the orbital plane in inertial space and the nutation and 2) in the case of estimating ERPs with subdaily resolution the correlation between retrograde diurnal polar motion and nutation (and so the respective orbital elements). In this contribution we study the interaction between the GPS orbits and subdaily model for the ERPs. Existing subdaily ERP model recommended by the IERS comprises ~100 terms in polar motion and ~70 terms in Universal Time at diurnal and semidiurnal tidal periods. We use a long time series of daily normal equation systems (NEQ) obtaine from GPS observations from 1994 till 2007 where the ERPs with 1-hour resolution are transformed into tidal terms and the influence of the tidal terms with different frequencies on the estimated orbital parameters is considered. We found that although there is no algebraic correlation in the NEQ between the individual orbital parameters and the tidal terms, the changes in the amplitudes of tidal terms with periods close to 24 hours can be better accmodated by systematic changes in the orbital parameters than for tidal terms with other periods. Since the variation in Earth rotation with the period of siderial day (23.93h, tide K1) in terrestrial frame has in inertial space the same period as the period of revolution of GPS satellites, the K1 tidal term in polar motion is seen by the satellites as a permanent shift. The tidal terms with close periods (from ~24.13h to ~23.80h) are seen as a slow rotation of the

  15. GPS-Based Highway Performance Monitoring Performance Monitoring Using GPS: Characterization of Travel Speeds on any Roadway Segment

    OpenAIRE

    Kornhauser, Alain L.

    2012-01-01

    Presented is a characterization of travel speed on any roadway segment based on probe vehicle position data. Most of the characterization is based position data obtained from GPS receivers because of their high precision and their increasing availability. Comparison is also made to Qualcomm’s Automatic Satellite Position Reporting (QASPR) system because of its long history (10+ years) of extensive use by the long-haul trucking industry. Described is the use of these data in conjunction with d...

  16. Remote reference processing in MT survey using GPS clock; MT ho ni okeru GPS wo mochiita jikoku doki system

    Energy Technology Data Exchange (ETDEWEB)

    Yamane, K; Inoue, J; Takasugi, S [Geothermal Energy Research and Development Co. Ltd., Tokyo (Japan); Kosuge, S [DRICO Co. Ltd., Tokyo (Japan)

    1996-05-01

    A report is given about the application of a synchronizing system using clock signals from GPS satellites to a remote reference method which is a technique to reject noise from the MT method. This system uses the C/A code out of the L1 band waves from NAVSTAR/GPS satellites. The new system was operated in MT method-using investigations conducted at China Peninsula, Aichi Prefecture, and Izu Peninsula, Shizuoka Prefecture, with the reference points placed several 100km away in Iwate Prefecture on both occasions. It was found as the result that it is basically possible to catch signals from the GPS at any place, that the signals are accurate enough to be applied to time synchronization for the MT method, and that the signals assure a far remote reference method with a separation of several 100km between the sites involved. The referencing process at high frequencies whose feasibility had been doubted proved a success when highly correlated signals were exchanged between two stations over a distance of several 100km. 5 refs., 9 figs.

  17. Performance Analysis of Several GPS/Galileo Precise Point Positioning Models.

    Science.gov (United States)

    Afifi, Akram; El-Rabbany, Ahmed

    2015-06-19

    This paper examines the performance of several precise point positioning (PPP) models, which combine dual-frequency GPS/Galileo observations in the un-differenced and between-satellite single-difference (BSSD) modes. These include the traditional un-differenced model, the decoupled clock model, the semi-decoupled clock model, and the between-satellite single-difference model. We take advantage of the IGS-MGEX network products to correct for the satellite differential code biases and the orbital and satellite clock errors. Natural Resources Canada's GPSPace PPP software is modified to handle the various GPS/Galileo PPP models. A total of six data sets of GPS and Galileo observations at six IGS stations are processed to examine the performance of the various PPP models. It is shown that the traditional un-differenced GPS/Galileo PPP model, the GPS decoupled clock model, and the semi-decoupled clock GPS/Galileo PPP model improve the convergence time by about 25% in comparison with the un-differenced GPS-only model. In addition, the semi-decoupled GPS/Galileo PPP model improves the solution precision by about 25% compared to the traditional un-differenced GPS/Galileo PPP model. Moreover, the BSSD GPS/Galileo PPP model improves the solution convergence time by about 50%, in comparison with the un-differenced GPS PPP model, regardless of the type of BSSD combination used. As well, the BSSD model improves the precision of the estimated parameters by about 50% and 25% when the loose and the tight combinations are used, respectively, in comparison with the un-differenced GPS-only model. Comparable results are obtained through the tight combination when either a GPS or a Galileo satellite is selected as a reference.

  18. Conocimientos, actitudes y prácticas en salud sexual entre estudiantes de los primeros semestres de enfermería

    Directory of Open Access Journals (Sweden)

    Mirith Vásquez Munive

    2013-10-01

    Full Text Available ResumenLa forma de ejercer la sexualidad tiene grandes repercusiones en la vida personal, gran peso en la aceptación social y es determinante en la imagen que proyecta la persona. Considerando que el ejercicio de la sexualidad puede llevar a un embarazo indeseado, que cada vez en esta sociedad es más temprana la edad de inicio de las relaciones sexuales, que la educación sexual en la primaria y bachillerato no ha generado el fruto deseado, y que frecuentemente las estudiantes universitarias se embarazan cuando no lo planearon, se hace necesario evaluar cuáles son las circunstancias que rodean esta situación. Se realizó un estudio descriptivo de corte transversal, entre 67 estudiantes de los primeros cinco semestres de enfermería, porque aún no han cursado la materia que dentro del currículo aborda la sexualidad. Para recoger la información se llevó a cabo una encuesta que abarca los aspectos más relevantes en cuanto a conocimientos, las actitudes con las que enfrentan la sexualidad y la forma cómo la ejercen. Entre las encuestadas predominan los buenos conocimientos sin grandes diferencias de un semestre a otro, la actitud hacia el sexo es mayoritariamente mala en todos los semestres y las prácticas están viciadas por hábitos poco saludables. (DUAZARY 2010, 211 - 218 AbstractThe form of exercise of sexuality has a great impact on the personal life, strong in the social acceptance and is crucial in the image projected by the person Whereas the exercise of sexuality can lead to an unwanted pregnancy, each time in this society is the earlier age of onset of sexual relations, that sex education in primary and secondary school has not produced the desired result and university students often do not become pregnant as planned, it is necessary to evaluate what are the circumstances surrounding this situation. It was a descriptive cross-sectional study among 67 students from the first five semesters of nursing, because they have not yet

  19. To report the obtained results in the simulation with the FCS-11 and Presto codes of the two first operation cycles of the Laguna Verde Unit 1 reactor; Reportar los resultados obtenidos en la simulacion con los codigos FCS-11 y PRESTO de los dos primeros ciclos de operacion del reactor Laguna Verde Unidad 1

    Energy Technology Data Exchange (ETDEWEB)

    Montes T, J.L.; Moran L, J.M.; Cortes C, C.C

    1990-08-15

    The objective of this work is to establish a preliminary methodology to carry out analysis of recharges for the reactor of the Laguna Verde U-1, by means of the evaluation of the state of the reactor core in its first two operation cycles using the FCS2 and Presto-B codes. (Author)

  20. An optical laser device for mapping 3D geometry of underwater karst structures: first tests in the Ox BelHa system, Yucatan, Mexico; Un dispositivo laser optico para la cartografia 3D de la geometria de estructuras karsticas submarinas: primeros resultados en el sistema de Ox BelHa, Yucatan, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Schiller, A.; Renard, P.

    2016-07-01

    In the course of extended hydrological studies in the coastal Karst plain of Yucatan, near the town of Tulum amongst others, a novel laser scanning device was developed and applied for the acquisition of the 3d-geometry of ground water conduits. The method is derived from similar industrial systems and for the first time adapted to the specific measurement conditions in underwater cave systems. The device projects a laser line over the whole perimeter at a certain position. This line represents the intersection of a plane with the cave walls. The line is imaged with a wide angle camera system. Through proper design and calibration of the device it is possible to derive the true scale geometry of the perimeter via special image processing techniques. By acquiring regularly spaced images it is possible to reconstruct the true scale and 3 d-shape of a tunnel through the incorporation of location and attitude data. In a first test in the Ox Bel Ha under-water cave system, about 800 metres of tunnels have been scanned down to water depths of 20 metres. The raw data is further interpolated using the ODSIM-algorithm in order to delineate the 3D geometry of the cave system. The method provides easy, operable acquisition of the 3-D geometry of caves in clear water with superior resolution and speed and significantly facilitates the measurement in underwater tunnels as well as in dry tunnels. The data gathered represents crucial input to the study of the state, dynamics and genesis of the complex karst water regime. (Author)