1,766 research outputs found
Band-pass filtering of the time sequences of spectral parameters for robust wireless speech recognition
In this paper we address the problem of automatic speech recognition when wireless speech communication systems are involved. In this context, three main sources of distortion should be considered: acoustic environment, speech coding and transmission errors. Whilst the first one has already received a lot of attention, the last two deserve further investigation in our opinion. We have found out that band-pass filtering of the recognition features improves ASR performance when distortions due to these particular communication systems are present. Furthermore, we have evaluated two alternative configurations at different bit error rates (BER) typical of these channels: band-pass filtering the LP-MFCC parameters or a modification of the RASTA-PLP using a sharper low-pass section perform consistently better than LP-MFCC and RASTA-PLP, respectively.Publicad
Practical Evaluation of a Network Mobility Solution
IFIP International Workshop on Networked Applications, Colmenarejo, Madrid/Spain, 6–8 July, 2005As the demand of ubiquitous Internet access and the current trend of all-IP communications keep growing, the necessity of a protocol that provides mobility management increases. The IETF has specified protocols to provide mobility support to individual nodes and networks. The Network Mobility (NEMO) Basic Support protocol is designed for providing mobility at IP level to complete networks, allowing a Mobile Network to change its point of attachment to the Internet, while maintaining ongoing sessions of the nodes of the network. All the mobility management is done by the mobile router whilst the nodes of the network are not even aware of the mobility.
The main aim of this article is evaluating the performance of the NEMO Basic Support protocol by using our implementation. We also discuss the design of an implementation of the NEMO Basic Support protocol.Publicad
Análisis sobre la influencia de la densidad en la termografía de infrarrojos y el alcance de esta técnica en la detección de defectos internos en la madera
This paper shows the results of a laboratory phase for
the determination of the 1limits of infrared thermography
in detecting internal defects in wood and, furthermore, it
analyses how the density of this material can influence
the surface temperature displayed in a thermogram. To
this end, experimental work is carried out whereby a
series of work and environmental parameters are
monitored (such as environmental temperature, relative
humidity, distance to target), and the process is
systematized by using pieces of different wood species
(different densities) and by devising a set of samples for
which various possible cases are analysed in terms of
size and internal position of the damage. Similarly, using
these samples, a study has been conducted on the effect
on the thermal image produced by an increase of
humidity inside the defect phenomena normally
associated with wood decay.En el presente artículo se muestran los resultados obtenidos
en una fase de laboratorio al tratar de determinar
el alcance de la termografía de infrarrojos en la detección
de defectos internos en la madera y, por otro lado,
cómo interviene la densidad de este material sobre la
temperatura superficial mostrada en un termograma.
Para ello se ha desarrollado un trabajo experimental
donde se han controlado una serie de parámetros
ambientales y de trabajo (temperatura ambiente, humedad
relativa, distancia al objetivo…), y se ha sistematizado
el proceso utilizando piezas de distintas especies
de madera (distintas densidades) y diseñando una serie
de probetas donde se han analizado varias casuísticas
posibles en cuanto a tamaño y posición interna de los
daños. Análogamente, sobre estas probetas se ha estudiado
el efecto que produce sobre la imagen termográfica
un incremento de humedad interna en el defecto
asociada normalmente a los fenómenos de pudrición de
la madera
Use of Alternative Wood for the Ageing of Brandy de Jerez
The use of alternative types of wood has arisen for the aging of the Brandy de Jerez, on a pilot plant level. In particular, besides the use of American oak, two more types of oak have been studied, French oak and Spanish oak, allowed by the Technical File for the ID Brandy de Jerez, and chestnut, which, though it is not officially allowed, is a type of wood which had been traditionally used in the area for the aging of wines and distillates. All of them have been studied with different toasting levels: Intense toasting and medium toasting. The study of the total phenolic composition (TPI), chromatic characteristics, organic acids, and sensory analysis have proven that chestnut leads to distillates with a higher amount of phenolic compounds and coloring intensity than oak. This behavior is the opposite as regards the toasting of the wood. Among the different types of oak, Spanish oak produces aged distillates with a higher phenolic composition and a higher color intensity. Regarding tasting, the best-assessed samples were those aged with chestnut, French oak, and American oak, and the assessors preferred those who had used a medium toasting level to those with an intense leve
A escola como "fator de proteção" para drogas: uma visão dos adolescentes e professores
This study aims to discover and describe protective factors regarding the use of drugs, according to teachers and students, aged 14 to 15 years, from a Public Secondary School in Santiago de Querétaro, Mexico. This is a descriptive and exploratory study. Data collection was carried out through semi-structure interview and non-participative observation with ten students and five teachers. Three themes resulted from data analysis: school and school's environment: the school does not provide a healthy environment; use of drugs: perceived by both the students and teachers in the institution itself; prevention programs: there are health promotion and prevention programs available at the school. According to the students' and teachers' perceptions, the school represents a risk factor.El presente trabajo tuvo como objetivo conocer y describir los factores protectores en relación con el consumo de drogas, que son considerados por los profesores y alumnos entre 14 y 15 años de edad, de una escuela pública de la ciudad de Santiago de Querétaro, México. Este estudio descriptivo y exploratorio utilizó entrevistas semi-estructuradas y observación no participativa, las cuales fueron aplicadas a 10 alumnos y 5 profesores. Del análisis de los datos surgen tres temáticas: escuela y ambiente escolar: la escuela no favorece un ambiente escolar saludable; consumo de drogas: se observa que tanto los alumnos y maestros consumen drogas en la institución; programas de prevención: la escuela tiene programas de prevención y promoción a la salud, pero no alcanzan a todos los alumnos. Los resultados refieren que la escuela es un factor de riesgo según la visión de profesores y alumnos.O objetivo deste trabalho foi conhecer e descrever os fatores de proteção em relação ao consumo de drogas, considerado por professores e adolescentes, entre 14 e 15 anos de idade, de uma Escola Pública Secundária na cidade de Santiago de Querétaro, México. Este estudo descritivo e exploratório utilizou entrevista semi-estruturada e a observação não participativa na coleta de dados. Os sujeitos do estudo foram dez alunos, ambos os sexos, e cinco professores do sexo feminino. Os resultados foram agrupados em três temas: escola e ambiente escolar: interpretado como a escola não favorece um ambiente saudável; consumo de drogas: é percebido tanto por alunos como professores na própria instituição; programas de prevenção: a escola possui programa de prevenção, entretanto, o mesmo não atinge a todos os alunos. Na visão dos adolescentes e professores, a escola não se apresenta como Fator de Proteção, mas sim como Fator de Risco
Design and Experimental Evaluation of a Route Optimisation Solution for NEMO
An important requirement for Internet protocol (IP)
networks to achieve the aim of ubiquitous connectivity is network
mobility (NEMO). With NEMO support we can provide Internet
access from mobile platforms, such as public transportation vehicles,
to normal nodes that do not need to implement any special
mobility protocol. The NEMO basic support protocol has been
proposed in the IETF as a first solution to this problem, but this
solution has severe performance limitations. This paper presents
MIRON: Mobile IPv6 route optimization for NEMO, an approach
to the problem of NEMO support that overcomes the limitations
of the basic solution by combining two different modes of operation:
a Proxy-MR and an address delegation with built-in routing
mechanisms. This paper describes the design and rationale of the
solution, with an experimental validation and performance evaluation
based on an implementation.Publicad
Características Sociodemográficas y Depresión en Adolescentes de Escuelas Secundarias Públicas del Municipio Camerino Z. Mendoza, Veracruz
La depresión en los adolescentes es un problema de salud pública que afecta a miles de jóvenes en el mundo. Esta investigación tiene como objetivo identificar las características sociodemográficas de los adolescentes en las escuelas públicas y su nivel de depresión. El enfoque de investigación es mixto, el instrumento aplicado se llama Inventario de depresión infantil (CDI) creado por Kovacs (2004) y se aplicó a estudiantes de secundaria del municipio de Camerino Z. Mendoza, Veracruz, México. El instrumento fue validado con Alfa de Cronbach y el análisis estadístico de las variables y tablas se realizó con el software SPSS versión 20. Como resultado, se identificaron las características sociodemográficas de los adolescentes con síntomas de depresión. Se concluye que la adolescencia es una edad vulnerable en la que puede desarrollarse la depresión, por lo que es importante que las instituciones sigan los programas de identificación de factores de riesgo y brinden apoyo profesional oportuno.
Depression in adolescents is a public health problem that affectsthousands of young people around the world. This paper focuses onidentifying the sociodemographic characteristics of adolescents in publicschools and their level of depression. The research approach is mixed, and theinstrument applied is called Child Depression Inventory (CDI) created byKovacs (2004). This instrument was applied to high school students of themunicipality of Camerino Z. Mendoza, Veracruz, Mexico. The instrument wasvalidated with Cronbach's Alpha and the statistical analysis of the variablesand tables was performed using SPSS version 20 software. As a result, thesociodemographic characteristics of adolescents with symptoms of depressionwere identified. It was concluded that since the adolescent age is a vulnerableage at which depression can develop, it is important that institutions followrisk factor identification programs and provide timely professional support
Validation of a questionnaire of knowledge and attitudes about the subcutaneous venous reservoir in nursing
[Abstract] Objective: design and validate a questionnaire to evaluate the knowledge and attitudes of nurses about the subcutaneous venous reservoir. Method: pilot test: 30 specialized care nurses. Main study: 236 nurses of primary and specialized care. Content validity was evaluated by Lawshe index, reliability by test-retest, internal consistency by Cronbach alpha, and construct validity by exploratory factorial analysis. Results: Items with a Lawshe index lower than 0.51 were eliminated. In the test-retest, the intraclass correlation coefficient was higher than 0.75 for all items. The Cronbach alpha of the attitude questionnaire reached 0.865. The Cronbach alpha value for knowledge was 0.750. The exploratory factor analysis identified a set of four dimensions for each part that explain 64% (attitude) to 80% (knowledge) of variability. Conclusion: the analysis of the reliability and validity of the questionnaire supports its use as an instrument to assess the knowledge and attitudes of nurses towards the subcutaneous venous reservoir.Ministerio de Asuntos Económicos y Transformación Digital (España); MTM2014-52876-RMinisterio de Asuntos Económicos y Transformación Digital (España); MTM2017-82724-RXunta de Galicia; ED431C-2016-015Xunta de Galicia; ED431C-2018/38Xunta de Galicia; ED431G / 0
Inspección with non destructive techniques of a historic building: oratorio San Felipe Neri (Cádiz)
El objetivo de este artículo es dar a conocer
los resultados obtenidos al aplicar técnicas no
destructivas de inspección (ultrasonidos y termografía)
durante las obras de reparación de
un edificio de gran valor histórico y artístico.
Estas técnicas no destructivas se han aplicado
en la inspección de la cubierta de madera del
edificio para detectar distintos estados de deterioro,
pérdidas de densidad y defectos, con el
objetivo de evaluar su estado de conservación.
Se ha realizado un trabajo de campo donde
se ha aplicado ambas técnicas conjuntamente,
los ultrasonidos, técnica eficaz para establecer
el diagnóstico de una estructura de madera, y
la termografía, técnica menos experimentada
en la inspección in situ de este material. El
objetivo es acotar el alcance y las posibilidades
reales de utilización de cada una de las técnicas.
En este sentido, se aplica la metodología
de ultrasonidos desarrollada y publicada por
las autoras y se estudia la termografía como
herramienta de inspección in situ analizando
las dificultades añadidas y parámetros de interferencia
no detectados en laboratorio.
Las conclusiones del trabajo ponen de manifiesto
que la unión de la técnica de ultrasonidos
y la termografía constituyen una buena
herramienta para la inspección in situ de las
estructuras de madera y para evaluar sus condiciones
permitiendo establecer un diagnóstico
adecuado. La termografía permite detectar
distintos contenidos de humedad y distintos
materiales y, por otro lado, los ultrasonidos
los distintos grados de deterioro o pérdida de
densidad en zonas localizadas con elevado
contenido de humedad de las piezas.The main aim of this article is showing the
results that have been obtained when non
destructive techniques (ultrasound and thermography)
are applied to a building with an
important artistic and historical value.
These non-destructive techniques have been
applied in the inspection of the wooden roof
structure to detect different states of deterioration,
loss of density and defects. The aim is
the assessment the state of the preservation of
the wooden structure. A fieldwork has been
carried out, where the two techniques have
been applied together, ultrasound, an effective
technique to establish the diagnosis of a
wooden structure, and the thermography, a
technique less tested in the in situ inspection
of this material. The aim is checking the range
and the real possibilities of using of each
technique. In this sense, the methodology of
ultrasound developed and published by the
authors is applied and the thermography like
in situ inspection tool, analysing additional
difficulties and interference parameters not
found in laboratory.
The conclusions of this study show that
the union of the ultrasound technique and
the thermography is a good tool for on-site
inspection of wooden structures and to assess
their conditions allowing establishing a
proper diagnosis. Thermography can detect
different moisture contents and different
materials and, on the other hand, ultrasound
detects different states of deterioration or
loss of density in specific areas with a high
moisture content of the piece
Forjados de madera de entrevigado cuajado con residuos cerámicos de demolición
The present work is the continuity of the research carried out by the group TEP 205,
"Analysis and evaluation of construction and structural systems in Architecture", focused on domestic architecture building typologies of cities as Seville or Cordoba from the seventeenth to the twentieth centuries.
The aim of the study, mainly experimental, is to develop a new infill piece, from the reuse of ceramic waste generated in demolition works. This piece is intended to be used in the floors of this building typology.
Different test models reproducing the geometry and structural characteristics of these slabs have been developed. In these models different dosages of mortars and geometries are studied, in order to achieve the necessary strength for their use on the building site. As a result, we have developed a piece in which resistance values reaches up to 137 Kgf, higher than the values required to prefabricated concrete slabs according to regulations.El trabajo realizado es una continuidad en la línea de investigación del grupo TEP-205,
“Análisis y evaluación de sistemas constructivos y estructurales en la Arquitectura”, centrada en las tipologías edificatorias de la arquitectura doméstica de ciudades como Sevilla o Córdoba de los siglos XVII al XX.
El objeto del trabajo, fundamentalmente experimental, consiste en desarrollar una nueva pieza de entrevigado, a partir del reaprovechamiento de los residuos cerámicos generados en las tareas de demolición. Esta pieza está destinada a emplearse en los forjados de entrevigado cuajado característicos de esta tipología edificatoria.
Para la definición de este elemento se han elaborado diferentes modelos de ensayo
reproduciendo la geometría y características constructivas de estos forjados. En estos
modelos se estudian diferentes dosificaciones de morteros y geometrías, en aras de
alcanzar la capacidad resistente necesaria para su utilización en obra. Como esultado, se ha desarrollado una pieza en la que se alcanzan valores resistentes de hasta 137 Kgf, superiores a los valores exigidos a las bovedillas prefabricadas de hormigón según normativa
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