112 research outputs found
Análisis de supervivencia en infraestructuras críticas
La dependencia del ser humano en el correcto funcionamiento de las redes de servicios ha ido incrementando
con el tiempo. A la vez, también ha incrementado el riesgo ante fallos en las redes, principalmente debido al
aumento de la complejidad y a las dependiencias presentes en las mismas. A raíz de este hecho surge la necesidad
de aumentar la resiliencia de las redes, donde los costes de los incidentes se propagan de manera drástica a lo
largo de la red, afectando a numerosos clientes e impactando tanto en los resultados como en la imagen de la
empresa.
Combinando la fiabilidad con el Input-Outup Inoperability Model (IIM) y con una técnica novedosa como es el
Path Diversity, se logra un modelo aplicable a todo tipo de redes y con unos resultados prometedores,
confirmándolo como una valiosa herramienta de cara a la toma de decisiones de una organización. El modelo
nos permite de manera rápida y eficiente determinar a aquellos puntos de la red con mayor riesgo, pudiendo así
realizar un mantenimiento más eficiente sobre dichos puntos.Universidad de Sevilla. Máster Universitario en Ingeniería Industria
Index for asset value measure obtained from condition monitoring digitalized data interpretation. A railway asset management application
Hosted by the Johannes Kepler University, Linz, Austria. May 23-24, 2019The objective of any asset is to provide value to the organization, being the corner
stone to get a highest possible economic benefit in a sustainable way. An effective
asset value management demands method that allow measuring and comparing the
expected value with the real value realized at any time during its life cycle for value
informed decision-making. Digitalization is providing new data about events and
states related to asset condition and risk, information that can be reinterpreted to
generate value measure strategies. This paper presents a proposal of TVO (Total
Value of Ownership) model where it is possible to quantify and measure the value, including its monitoring throughout the life cycle of the asset and/or system.
Proposed TVO model is focused on Safety, one of the most relevant value factors for
Industry and Infrastructure sectors. Asset events and states are intrinsically linked to
the defined failure modes. Consequently, it is necessary to structure the system
information around the failure modes that have been defined, in order to obtain a
value measurement index. A railway use case is presented
An overview on the obsolescence of physical assets for the defence facing the challenges of industry 4.0 and the new operating environments
Libro en Open AccessThis contribution is intended to observe special features presented in physical assets for
defence. Particularly, the management of defence assets has to consider not only the reliability, availability,
maintainability and other factors frequently used in asset management. On the contrary, such systems
should also take into account their adaptation to changing operating environments as well as their capability
to changes on the technological context. This study approaches to the current real situation where, due
to the diversity of conflicts in our international context, the same type of defence systems must be able
to provide services under different boundary conditions in different areas of the globe. At the same time,
new concepts from the Industry 4.0 provide quick changes that should be considered along the life cycle
of a defence asset. As a finding or consequence, these variations in operating conditions and in technology
may accelerate asset degradation by modifying its reliability, its up-to-date status and, in general terms, its
end-of-life estimation, depending of course on a diversity of factors. This accelerated deterioration of the
asset is often known as “obsolescence” and its implications are often evaluated (when possible), in terms
of costs from different natures. The originality of this contribution is the introduction of a discussion on
how a proper analysis may help to reduce errors and mistakes in the decision-making process regarding the
suitability or not of repairing, replacing, or modernizing the asset or system under study. In other words,
the obsolescence analysis, from a reliability and technological point of view, could be used to determine the
conservation or not of a specific asset fleet, in order to understand the effects of operational and technology
factors variation over the functionality and life cycle cost of physical assets for defence
Identification of factors predicting spoken language development in young children with a cochlear implant
This paper examines the factors that are significant predictors of spoken language acquisition in children with cochlear implants. Factors identified include age of cochlear implantation, age of diagnosis, age started hearing aid use, parent educational level, and family income
Cyber physical systems implementation for asset management improvement: A framework for the transition
Libro en Open AccessThe transformation of the industry due to recent technologies introduction is an evolving
process whose engines are competitiveness and sustainability, understood in its broadest sense (environmental,
economic and social). This process is facing, due to the current state of scientific and technological
development, a new challenge yet even more important: the transition from discrete technological solutions
that respond to isolated problems, to a global conception where the assets, plant, processes and engineering
systems are conceived, designed and operated as an integrated complex unit. This vision is evolving
besides a set of concepts that are, in some way, to guide this development: Smart Factories, Cyber-Physical
Systems, Factory of the Future or Industry 4.0, are examples. The full integration of the operation and
maintenance (O&M) processes in the production systems is a key topic within this new paradigm. Not
only that, this evolution necessarily results in the emergence of new processes and needs of O&M, i.e.
also, the O&M will undergo a profound transformation. The transition from actual isolated production
assets to such Industry 4.0 with CPS is far from easy. This document presents a proposal to develop such
transition adapting one iteration of the Model of Maintenance Management (MMM) integrated into
ISO 55000 to the complexity of incorporating “System of Systems” CPSs maintenance. It involves several
stages: identification, prioritization, risk management, planning, scheduling, execution, control, and
improvement supported by system engineering techniques and agile/concurrent project managemen
Influence of 2% Chlorhexidine on the Bond Strength of Three Adhesive Systems on Primary Molars: An In Vitro Study
The hydrolysis of the collagen matrix by metalloproteinases (MMPs) is one of the paradigms that currently arouses most interest due to its close relationship with a decrease in bond strength (BS) and consequent restoration failure. Chlorhexidine 2% has demonstrated its ability to inhibit MMPs’ activity in the permanent dentition, improving the duration of resin–dentine, but there are few studies on deciduous dentition and its possible repercussions. Aim: To determine the influence of 2% chlorhexidine digluconate (CHX) as a dentine pretreatment on the BS of three adhesive systems on primary molars. Methods: 128 primary extracted molars were assigned to eight groups at random. BS in vitro was recorded by micropush-out test, and analyzed by two-way ANOVA. Results: BS values oscillated from 15.01 MPa to 20.41 MPa. There was no statistically relevant variation between the BS total mean of those adhesive groups that had received CHX pretreatment versus those that did not. Adper Prompt L-Pop was the self-etching adhesive with the best BS. Adper Scotchbond 1XT was the total-etch adhesive with the best BS values. Conclusions: Application of 2% chlorhexidine for 60 s as dentine pretreatment did not affect the immediate BS of several adhesive systems used in primary dentition
Crónica
Comentario y crónica sobre las II Jornadas Uruguayas de Estudios Clásicos (Montevideo, 2002), el Curso Internacional 2002 del Centro de Estudios Latinos, las XII Jornadas del Instituto de Estudios Grecolatinos de la UCA (Buenos Aires, 2003), la I Jornada Interdisciplinaria "Conociendo a Hildegarda, la abadesa de Bingen y su tiempo" de la UCA (Buenos Aires, 2003), el V Congreso da Sociedade Brasileria de Estudos Classicos y XIII Reuniao Anual SBEC (Brasil, 2003), el Curso Internacional 2003 del Centro de Estudios Latinos y las Jornadas del Centro de Estudios Latinos (2002 y 2003).Centro de Estudios Latino
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