3,082 research outputs found
Collective Bargaining under Complete Information
In this paper, we build and structurally estimate a complete information bargaining model of collective negotiation for Spain. For large firms, the assumption of complete information seems a sensible one, and it matches the collective bargaining environment better than the one provided by private information models. The specification of the model with players having different discount factors allows us to measure their relative bargaining power, a recurrent question in the theory of bargaining. We find that both entrepreneurs and workers have high discount factors, and no evidence that entrepreneurs have bigger bargaining power as usually assumed.Delays, sequential bargaining, structural estimation
Identificar cobertura vegetal de suelo clasificando pixeles en imágenes hiperepectrales con SVM (maquinas de soporte vectorial)
Se realizó un experimento para clasificar 4 clases de cobertura vegetal de suelo usando imágenes hiperespectrales, con 63 bandas. Se trabajó con un pixel representado por vector de 63 características (uno por banda). Se probaron nueve filtros y el análisis sin filtro. Para la clasificación se usó una máquina de soporte vectorial (SVM), con un kernel perceptor multicapa (MLP). Se obtienen precisiones aceptables, mejorando muchas encontradas en la literatura [1] [2]. Con este trabajo se demuestra que es mejor usar imágenes hiperespectrales que las comúnmente usadas. Los resultados sugieren que es necesario emplear otras técnicas o pre-proceso para mejorar las clasificaciones en este tipo de imágenes
Análisis, diseño y optimización de una red local con intervlans troncalizadas y seguridad de acceso mediante la aplicación de acls
En esta tesis diseñamos una red local con 3 VLANS, las cuales se comunican entre ellas de manera troncalizada, para este propósito empleamos un router que permite la comunicación entre ellas. Sobre nuestro diseño implementamos los 4 principales protocolos de enrutamiento que existen en la actualidad que son: RIP V1, RIP V2, IGRP, y, EIGRP, siendo estos dos últimos protocolos propietarios de la marca CISCO.
Realizamos pruebas de conectividad entre los distintos dispositivos que conformaron nuestra red, aplicando cada uno de los protocolos de enrutamiento detallados en este resumen, escogimos el mejor en base a la escalabilidad y convergencia, sobre la configuración de los routers con el protocolo seleccionado se aplicaron ACLS a las interfases tanto físicas como virtuales de los routers, con lo cual comprobamos el correcto funcionamiento de las ACLS.
También se efectuaron pruebas de redundancia aplicando Etherchannel, tecnología propietaria de CISCO, se simularon caídas de enlace, verificando de esta manera la continuidad de la conectividad de nuestra re
Brewster quasi bound states in the continuum in all-dielectric metasurfaces from single magnetic-dipole resonance meta-atoms
Bound states in the continuum (BICs) are ubiquitous in many areas of physics,
attracting especial interest for their ability to confine waves with infinite
lifetimes. Metasurfaces provide a suitable platform to realize them in
photonics; such BICs are remarkably robust, being however complex to tune in
frequency-wavevector space.Here we propose a scheme to engineer BICs and
quasi-BICs with single magnetic-dipole resonance meta-atoms. Upon changing the
orientation of the magnetic-dipole resonances, we show that the resulting
quasi-BICs,emerging from the symmetry-protected BIC at normal incidence, become
transparent for plane-wave illumination exactly at the magnetic-dipole angle,
due to a Brewster-like effect. While yielding infinite Q-factors at
normalincidence(canonical BIC), these are termed Brewster quasi-BICs since a
transmission channel is always allowed that slightly widens resonances at
oblique incidences. This is demonstrated experimentally through reflectance
measurements in the microwave regime with high-refractive-index mm-disk
metasurfaces. Such Brewster-inspired configuration is a plausible scenario to
achieve quasi-BICs throughout the electromagnetic spectrum inaccessible through
plane-wave illumination at given angles, which could be extrapolated to other
kind of waves.Comment: 15 pages, 7 figures; typos corrected, Figs. 3 & 5 modified, new Fig.
7 & references adde
Relación entre el grado de corrosión y el comportamiento mecánico de armaduras B500 SD corroídas
En este trabajo se discuten las herramientas de orden matemático necesarias para la presentación, a los alumnos de grado en edificación, de una metodología para el análisis de la incidencia de la corrosión de armaduras en su límite elástico y su resistencia a tracción, discutiendo los resultados de un ensayo a tracción
Green building rating systems and their application in the Mexican context
Revista indexada en SCOPUSThis article offers a review of the scientific literature aimed at putting forward a proposal on the main variables or categories of sustainable design to take into consideration to manage, plan, design, build and maintain buildings in Mexico. The methodology consisted in reviewing 5 successfully tried international green building models (rating systems), from which a series of requirements by sustainable category were taken in order to propose categories and variables proper to the Mexican context. The result was a checklist that comprises sustainable design requirements broken down by categories: natural, human, technologic and economic to apply in the Mexican context. It is concluded that successfully tried green building international models such as: LEED®, BREAM®, CASBEE®, ESTIDAMA® or Green Star® can be very useful to manage, plan, design and construct sustainable buildings around the world
Durabilidad de hormigones autocompactantes con prestaciones especiales expuestos en atmósferas marinas y urbanas.
El hormigón autocompactante es aún una tecnología relativamente nueva y se tiene un escaso conocimiento acerca del comportamiento frente a durabilidad de este material. Sin embargo, la creciente tendencia al desarrollo de códigos y normativas que contemplan tanto la durabilidad del hormigón desde la fase de diseño como el empleo de nuevos materiales, implica un mayor conocimiento de las propiedades durables de este tipo de hormigón. En el presente trabajo se presentan los resultados obtenidos a partir de un estudio de durabilidad con hormigón autocompactante convencional fabricado con filler calizo, así como hormigones autocompactantes, con la misma dosificación pero modificados bien con incorporación de fibras (metálicas y poliméricas) o bien con sustitución del filler calizo por residuos de lodos de naturaleza caliza. Se han llevado a cabo tanto ensayos en laboratorio para determinación de indicadores de durabilidad como ensayos de exposición durante un año a atmósferas naturales (marina y urbana con distinta humedad relativa). Los indicadores de durabilidad analizados arrojan una elevada calidad de los distintos hormigones autocompactantes, lo cual se confirma a partir de ensayos de exposición en atmósferas reales. Si bien no se ha visto que la incorporación de fibras influya en la interacción de este material con el cloruro ni con el CO2, la sustitución del filler calizo por residuo de lodo indica un ligero aumento en la carbonatación y el transporte de cloruros
Antiviral activity of European sea bass ISG15 against betanodavirus infections
To study the role of the sea bass ISG15 protein against betanodavirus infections, an in vivo transcription analysis has been performed after RGNNV infection and poly I:C inoculation, and the sea bass ISG15 activity has also been evaluated using an in vitro approach.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech
Predictive Models for Forecasting Public Health Scenarios: Practical Experiences Applied during the First Wave of the COVID-19 Pandemic
Background: Forecasting the behavior of epidemic outbreaks is vital in public health. This
makes it possible to anticipate the planning and organization of the health system, as well as possible
restrictive or preventive measures. During the COVID-19 pandemic, this need for prediction has
been crucial. This paper attempts to characterize the alternative models that were applied in the
first wave of this pandemic context, trying to shed light that could help to understand them for
future practical applications. Methods: A systematic literature search was performed in standardized
bibliographic repertoires, using keywords and Boolean operators to refine the findings, and selecting
articles according to the main PRISMA 2020 statement recommendations. Results: After identifying
models used throughout the first wave of this pandemic (between March and June 2020), we begin
by examining standard data-driven epidemiological models, including studies applying models such
as SIR (Susceptible-Infected-Recovered), SQUIDER, SEIR, time-dependent SIR, and other alternatives.
For data-driven methods, we identify experiences using autoregressive integrated moving average
(ARIMA), evolutionary genetic programming machine learning, short-term memory (LSTM), and
global epidemic and mobility models. Conclusions: The COVID-19 pandemic has led to intensive
and evolving use of alternative infectious disease prediction models. At this point it is not easy to
decide which prediction method is the best in a generic way. Moreover, although models such as
the LSTM emerge as remarkably versatile and useful, the practical applicability of the alternatives
depends on the specific context of the underlying variable and on the information of the target to
be prioritized. In addition, the robustness of the assessment is conditioned by heterogeneity in the
quality of information sources and differences in the characteristics of disease control interventions.
Further comprehensive comparison of the performance of models in comparable situations, assessing
their predictive validity, is needed. This will help determine the most reliable and practical methods
for application in future outbreaks and eventual pandemics
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