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Robot perception often fails in uncontrolled environments due to unfamiliar object classes, different domains, or hardware issues. This poses significant challenges for human-robot interaction (HRI) outside of a lab or user study settings. My work focuses on two separate approaches: improving robot perception models and developing systems where users can directly correct robot errors. My research strives to improve HRI in real-world scenarios by reducing vision errors and empowering users to address them., QC 20240409 Part of ISBN 9798400703232

While the evidence base on successful practices in knowledge exchange is rapidly growing, much less attention has been given in the academic literature to documenting and reflecting on failures in trying to exchange different types of evidence between academics, practice partners and policymakers. However, learning from failures is just as important, if not more crucial, than celebrating successes. Therefore, in this introduction to the special issue on learning from failures in knowledge exchange, we discuss crosscutting themes across the seven papers. We start by comparing and theorising different definitions of failures, and by exploring the relational barriers and structural stressors underlying these failures. We argue for the creation of a ‘failure culture’ in organisations, in which failures are no longer avoided but actively encouraged. To turn failures into successes, we identify a need for more sharing and publishing of failures, early engagement with stakeholders in the knowledge exchange process, and illustrate the importance of boundary spanners. We conclude with recommendations for future work, related to promising theoretical approaches, such as system thinking, the re-addressing of power imbalances through leadership, and highlight art-based approaches as a mechanism for rebalancing power.

Drones or unmanned aerial vehicles (UAVs) have become increasingly important in recent years. They are essential in many areas, such as crop monitoring and delivering critical medicine to hard-to-reach areas. This thesis delves into the often-overlooked aspect of failures within the multidisciplinary Human Drone Interactions (HDI) field. Specifically, it examines how these failures correlate with two dependent variables: trust and risk-taking. Despite the importance of understanding failures in HDI for its wider acceptance and integration, there is an evident gap in research on this topic, highlighting the importance of this work. Previous studies indicate that trust in emerging technologies is pivotal in their adoption. To investigate the correlations in question, a user study was conducted in which participants operated a drone within a confined space, navigating an obstacle course for a monetary reward. The experiment was divided into two trial blocks. Specific failures were simulated during one of the trial blocks, the failure trial block. The nonfailure trial block included no simulated failures. Participants were subject to both trial blocks in randomized orders. Subsequently, participants were surveyed on trust and risk aversion. Our findings revealed a statistically significant correlation between HDI failures and diminished trust. However, no discernible connection between HDI failures and risk-taking was observed. The results are interesting as they suggest that failures could cause lower trust in drones., Drönare har blivit allt mer framträdande under de senaste åren. De är väsentliga inom flertalet områden, bland annat inom övervakning av jordbruksfält och medicinleveranser till svåråtkomliga platser. Detta examensarbete behandlar ämnet misslyckanden inom det tvärvetenskapliga området människodrönarinteraktioner. I detta examensarbete undersöks om misslyckanden inom människodrönarinteraktioner korrelerar med tillit och risktagande. Tidigare studier indikerar att tillit för nya tekniker kan vara avgörande för deras acceptans. För att undersöka misslyckanden inom människodrönarinteraktioner genomfördes en användarstudie där deltagarna manövrerade en drönare inom ett avgränsat utrymme, och navigerade genom en hinderbana där deltagarna kunde vinna en monetär belöning. Experimentet delades in i två provblock. Specifika misslyckanden simulerades under ett av provblocken, som var felprovblocket. Icke-felprovblocket innehöll inga simulerade fel. Deltagarna utsattes för båda provblocken i slumpmässig ordning. Därefter tillfrågades deltagarna om tillit och riskaversion i enkäter. Våra resultat visade en statistisk signifikans på korrelation mellan misslyckanden och minskat förtroende. Det observerades ingen korrelation mellan misslyckanden och risktagande. Resultaten är intressanta eftersom de antyder att misslyckanden kan orsaka lägre förtroende för drönare.

Industrial growth imposes the development of efficient technologies, diagnostic methods and maintenance. In general, the management of the maintenance process is considered to be insufficient. The main causes of dissatisfaction are often the result of unexpected failures that affect technical availability and cause unforeseen expenses. It is essential to guarantee availability and high reliability by developing technologies, methods and mathematical models that favor their management. The objective of the research is to identify regularities for the preparation of a Bayesian network model that allows the prediction of failures and favors decision making in maintenance management. A review of the specialized literature was conducted; the search was performed in the Scopus, IEEE Xplorer, Dimensions and Lens.org databases. The co-occurrence of keywords was calculated using VOSviewer software to identify the main trends, and a meta-analysis of the articles found was also carried out. The main trends identified were the use of Bayesian networks for failure prediction and diagnosis, as well as risk analysis and maintenance planning. The main regularities for the preparation of the model are the hierarchization of processes, systemic analysis, data collection, expert opinions, identification of main variables and their correlation and the determination of probabilities of causes of events. The use of the identified regularities allows a greater effectiveness of the Bayesian network model for the prediction of failures, guaranteeing efficiency in decision making., El crecimiento industrial impone el desarrollo de tecnologías, métodos de diagnóstico y mantenimiento eficientes. En sentido general se considera a la gestión del proceso de mantenimiento como insuficiente. Las principales causas de insatisfacciones a menudo son el resultado de fallas inesperadas que afectan la disponibilidad técnica, provocan gastos imprevistos. Es imprescindible garantizar disponibilidad y una alta confiabilidad desarrollando tecnologías, métodos y modelos matemáticos que favorezcan su gestión. El objetivo de la investigación es identificar regularidades para la confección de un modelo de redes bayesianas que permita la predicción de fallos y favorezca la toma de decisiones en la gestión del mantenimiento. Se llevó a cabo una revisión de la literatura especializada; la búsqueda se realizó en las bases de datos Scopus, IEEE Xplorer, Dimensions y Lens.org. Se calculó la co-ocurrencia de palabras clave mediante el software VOSviewer para identificar las principales tendencias también se efectuó un meta-análisis de los artículos encontrados. Como principales tendencias se identificaron el empleo de las redes bayesianas para la predicción y diagnóstico de fallos, así como el análisis de riesgos y la planificación del mantenimiento. Las principales regularidades para la confección del modelo son la jerarquización de los procesos, el análisis sistémico, la recopilación de datos, opiniones de expertos, identificación de variables principales y su correlación y la determinación de probabilidades de causas de los sucesos. El empleo de las regularidades identificadas permite una mayor efectividad del modelo de redes bayesianas para la predicción de fallos garantizando la eficiencia en la toma de decisiones.

© John Wiley & Sons, Inc. The authors are especially endebted to Dr. J. A. Martínez, Dr. E. Hita, and Dr. M. Melgosa at Departamento de Óptica of Granada University for their continual advice and help. They also want to express their gratitude to the anonymous referees who comments helped us to improve the article., In this research we compare the colorimetric behavior of several observers. For color centers recommended by CIE we have produced large sets of spectral distributions, which are metameric for the CIE 1931 standard observer. For each one of the color centers, we compare the clouds of chromaticity coordinates with the chromaticity thresholds. We define a parameter that provides a quantitative measure of the interobserver variability. This parameter is used to arrange the observers by their degree of likeness. A similar procedure has been used to compare two real observers. It is shown how there is no reciprocity between the colorimetric behavior of two real observers, Depto. de Óptica, Fac. de Ciencias Físicas, TRUE, pub

This study aims to address the question of why the efforts of family Small and Medium Enterprises (family SMEs) to develop international partnerships fail. In particular, it draws on the network theory of internationalisation and SEW perspective and explores how family managers’ interpretation of the behaviour of potential international partners can lead to the failure of the attempt to develop an international partnership in the context of family SMEs internationalisation. To do so, it conducts a multiple case study of four internationalised Greek family SMEs in the food and beverages sector. The findings suggest that family managers set strict criteria, regarding their expectations about international partners’ behaviour when evaluating the potential international partners, which emerge from family managers’ effort to fulfil family goals (e.g., the preservation of family harmony and family reputation), and reveal that the family managers’ priority on the fulfilment of family goals can hinder the international partnership development process. These findings build upon the limited, yet important, family SMEs literature on international partnership failures and enrich previous networking theories about family SMEs’ internationalisation., Este estudio tiene como objetivo abordar la cuestión de por qué fracasan los esfuerzos de las Pequeñas y Medianas Empresas familiares (PYMEs familiares) para desarrollar alianzas internacionales. En particular, se basa en la teoría de la red de internacionalización y la perspectiva SEW y explora cómo la interpretación de los gerentes familiares sobre el comportamiento de los socios internacionales potenciales puede conducir al fracaso del intento de desarrollar una asociación internacional en el contexto de la internacionalización de las PYMEs familiares. Para ello, lleva a cabo un estudio de caso múltiple de cuatro PYMEs familiares griegas internacionalizadas en el sector de alimentos y bebidas. Los hallazgos sugieren que los gerentes familiares establecen criterios estrictos con respecto a sus expectativas sobre el comportamiento de los socios internacionales al evaluar a los socios internacionales potenciales, que surgen del esfuerzo de los gerentes familiares para cumplir con los objetivos familiares (por ejemplo, la preservación de la armonía familiar y la reputación familiar), y revelan que la prioridad de los gerentes familiares en el cumplimiento de las metas familiares puede dificultar el proceso de desarrollo de alianzas internacionales. Estos hallazgos se basan en la literatura limitada, pero importante, de las PYMEs familiares sobre los fracasos de las asociaciones internacionales y enriquecen las teorías de redes anteriores sobre la internacionalización de las PYMEs familiares.

During the July 2021 Flood, the main flood defences along the River Meuse in the Netherlands performed well and did not breach. This paper is meant to document the various incidents on the flood defence system. As such, it provides an overview and description of the reported incidents related to flood defences, including a few breaches in minor flood defences. The incidents include overflow of embankments, sand boils, internal erosion at structures, and damage to a large weir and an outflow structure. Also, two local flood defences breached: an emergency embankment at Horn and an embankment in Roermond. During the event, the media reported on a dike breach at Meerssen/Bunde, however, after further investigation, it appeared that the concentrated outflow there was fuelled from a forgotten buried culvert., Hydraulic Structures and Flood Risk

Concentrating solar power plants use sensible thermal energy storage, a mature technology based on molten salts, due to the high storage efficiency (up to 99%). Both parabolic trough collectors and the central receiver system for concentrating solar power technologies use molten salts tanks, either in direct storage systems or in indirect ones. But even though this is a mature technology, it still shows challenges in its implementation and operation. This paper underscores the critical importance of stringent design criteria for molten salt tanks in thermal storage technology. Focusing on the potential ramifications of design failures, the study explores various dimensions where an inadequate design can lead to severe consequences, even jeopardizing the viability of the entire technology. Key areas discussed include structural integrity, corrosion, thermal shock, thermal expansions, and others. By elucidating the multifaceted risks associated with design shortcomings, this paper aims to emphasize the necessity of thorough reviews and adherence to robust design principles for ensuring the success, safety, and sustainability of thermal storage technology.

The success of open innovation has been widely acknowledged in both industrial practice and academic research. However, we understand much less about the limits of open innovation. A better understanding of this downside is nevertheless very important as there are still many organizations that struggle when trying to implement an open innovation strategy. At the same time, some research has pointed to decreasing returns to openness, or more generally to the compex relationship between open innovation and (financial) performance. This is why we call for more attention to failures, risks, and costs — and even the “dark side” — in the context of open innovation. In this editorial, we will further introduce this perspective, describe the articles published in this special issue, and offer some suggestions for future research. Overall, we believe that a better understanding of the limits of openness will allow for a more balanced view, thereby further expanding the frontiers of open innovation practice and theory.

Throughout the years in which a pavement is in service, it is exposed to climatic actions and traffic that wear out its useful life, as well as its quality of mechanical characteristics, as well as functional, causing various failures and types of failures to exist. clothing on flexible pavements; Therefore, using technological option tools has become essential for their respective evaluations. Aim. Perform an analysis of existing failure assessment technology tools in flexible pavement surfaces. Type of research. The research presents a qualitative approach, which is supported by obtaining reference information on technological tools for evaluating failures in flexible pavements. Method. It was carried out through bibliographic reviews of scientific articles; Therefore, for this study, the use of databases such as: REDALYC, SCIENCEDIRECT, DIALNET, SCIELO; whose applied criteria were in terms of temporality the last 16 years (2007 - 2023), working with a total of 31 original scientific articles, to later carry out the collection of information and finally the analyzes related to our objectives. Conclusion. Terrestrial photogrammetry and neural networks is the best technological option for the evaluation of failures in the surface condition of flexible pavements; since it contributes to the reduction of time and cost, being the most efficient of the other technological tools., A lo largo de los años en que un pavimento se encuentra al servicio, es expuesto ante las acciones climáticas y tránsito que desgastan la vida útil del mismo, tanto como su calidad de características mecánicas, como funcionales, haciendo que existan diversas fallas y tipos de desgastes en los pavimentos flexibles; por lo que emplear herramientas de opciones tecnológicas, se ha vuelto indispensable para sus respectivas evaluaciones. Objetivo. Realizar un análisis de herramientas tecnológicas de evaluación de fallas existentes en superficies del pavimento flexible. Tipo de investigación. La investigación presenta un enfoque cualitativo, el cual se sustenta por obtener información referente a las herramientas tecnológicas de evaluación de fallas en los pavimentos flexibles. Método. Se realizó a través de revisiones bibliográficas de artículos científicos; por lo que, para este estudio se ha considerado el uso de bases de datos como: REDALYC, SCIENCEDIRECT, DIALNET, SCIELO; cuyos criterios aplicados fueron en cuanto a temporalidad los ùlimos 16 años (2007 - 2023), trabajando con un total de 31 artículos científicos originales, para después realizar la recopilación de información y finalmente los análisis respectivos relacionados a nuestros objetivos. Conclusión. La fotogrametría terrestre y redes neuronales es la mejor opción tecnológica de la evaluación de fallas en la condición superficial de pavimentos flexibles; ya que, contribuye en la reducción de tiempo y costo, siendo el más eficiente de las demás herramientas tecnológicas

Tailings dams have relatively high failure rates throughout the world and the consequences of these failures often result in significant loss of life and damage to the environment and property. However, the triggers and failure mechanisms are typically hypothesized and not well understood. To investigate potential triggers and the corresponding failure mechanisms, two centrifuge model tests were conducted on loose slopes made of gold tailings using a scaled viscous fluid to induce instability in flight. A numerical back-analysis was also carried out to investigate and verify the associated mechanisms. Two failure mechanisms were observed in the centrifuge tests. In the first test, large seepage forces caused sloughing at the toe. The initially drained instability at the toe induced significant positive excess pore pressures due to the loose state, as well as to the initially higher degree of saturation in the toe region, triggering localized liquefaction at the toe (undrained response). Due to the localized liquefaction, the tailings at the toe could not support the tailings upstream of the toe, triggering a retrogressive flowslide failure. In the second test, a slope failure occurred due to drained instability, i.e., failure occurred once the drained factor of safety approached unity. No liquefaction was evident, due to the initially lower degree of saturation in the toe region, as well as to the slower rate of shearing compared to the first test. As revealed by both physical and numerical simulations, the structural collapse of the soil resulted in the drained instability of the slope, which triggered a slide-to-flow failure.

The success of open innovation has been widely acknowledged in both industrial practice and academic research. However, we understand much less about the limits of open innovation. A better understanding of this downside is nevertheless very important as there are still many organizations that struggle when trying to implement an open innovation strategy. At the same time, some research has pointed to decreasing returns to openness, or more generally to the compex relationship between open innovation and (financial) performance. This is why we call for more attention to failures, risks, and costs — and even the “dark side” — in the context of open innovation. In this editorial, we will further introduce this perspective, describe the articles published in this special issue, and offer some suggestions for future research. Overall, we believe that a better understanding of the limits of openness will allow for a more balanced view, thereby further expanding the frontiers of open innovation practice and theory.

The electroluminescence technique is presented, which allows qualitative analysis of the condition of the photovoltaic module, applied to the characterization of silicon photovoltaic modules under different conditions. The advantages and the range of applicability of the technique are detailed depending on the environment in which it is done, the technical specifications of the electroluminescence camera and the methodology that was carried out for the characterizations. The results of the implementation of the technique both in laboratory conditions and in a photovoltaic system installed on a roof were presented. Defects were detected such as cells with significant breaks and microcracks; disconnections between cells; corrosion and shunt failures along the fingers caused by stresses in the welding points. Microcracks and breaks are much more frequent than the rest of the faults detected by electroluminescence., RESUMEN Se presenta la técnica de electroluminiscencia que permite realizar análisis cualitativos de la condición del módulo fotovoltaico, aplicada a la caracterización de módulos fotovoltaicos de silicio bajo distintas condiciones. Se detallan las ventajas y el rango de aplicabilidad de la técnica en dependencia del entorno en el cual se haga, las especificaciones técnicas de la cámara de electroluminiscencia y la metodología que se llevó a cabo para las caracterizaciones. Se presentan los resultados de la implementación de la técnica tanto en condiciones de laboratorio como en un sistema fotovoltaico instalado sobre cubierta. Como resultado de la aplicación de la técnica de electroluminiscencia se detectaron defectos como celdas con importantes roturas y micro-fracturas, desconexiones entre celdas; corrosión y fallas a lo largo de los contactos metálicos del módulo ocasionados por tensiones en los puntos de soldadura. Las micro-fracturas y las roturasson mucho más frecuentes que el resto de fallas detectadas mediante la electroluminiscencia.

Connectivity maintenance is an important requirement in wireless sensor and actuator networks (WSANs) because node failures can, potentially, lead to destructive changes in the network topology, which, in turn, can create a partitioned network. Preserving k-connectivity in a WSAN is important for keeping stable connections. A k-connected network is a network that remains connected after removing any k-1 nodes. Higher k values provide more reliable connectivity and a higher level of fault tolerance. In this article, we present a distributed k-connectivity restoration approach for heterogeneous WSANs where the nodes can be static or mobile. In the proposed algorithm, each node identifies the mobile nodes in the network and its 2-hop local subgraph. After a node is incapacitated, a neighbor of the failed node calls a mobile node with minimum moving cost to the location of the failed node if the failure reduces k. A minimum cost movement path between a neighbor of the failed node and a mobile node is constructed by considering the locations of the nodes, moving costs, and obstacles. Testbed experiments and comprehensive simulations reveal that the proposed distributed algorithm is capable of restoring k-connectivity with up to 35.5% lower sent Bytes and up to 40.9% lower movement cost than the existing algorithms., TUBITAK (Scientific and Technical Research Council of Turkey)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [113E470], This work was supported by TUBITAK (Scientific and Technical Research Council of Turkey) under Project Number 113E470.

A investigação criminal deve ser eficiente na tarefa de identificar autores de crimes e fornecer elementos para o início da ação penal, sem, todavia, violar os direitos dos suspeitos. Os procedimentos policiais adotados atualmente em inquéritos policiais são simplistas, sobretudo em investigações relativas à criminalidade de rua, geralmente direcionadas a obter confissões dos suspeitos e depoimentos de testemunhas. As falhas de procedimento, em geral, surgem com a Polícia, se mantém com o Ministério Público e produzem seus efeitos mais dramáticos com a decisão judicial, especialmente nos casos em que a vítima é convidada para um ato de reconhecimento formal do suspeito. Essa realidade motivou, no Brasil, a mudança do entendimento do Superior Tribunal de Justiça, que passou a exigir o cumprimento fiel das disposições do Código de Processo Penal. O próximo passo na correção de tais erros depende de uma transformação da rotina policial, com a fiscalização do Ministério Público e a rejeição da prova ilícita pelo juiz, por meio da adoção de critérios que imprimam racionalidade ao procedimento policial, por meio da apropriação do conhecimento científico acumulado sobre a dinâmica dos reconhecimentos equivocados.

This paper presents the model for the identification of reference points on the lifetime curve of engineering systems. This curve commonly represents the increase and decline of failure in relation to time. A direct correlation between failure rate and costs is assumed in this paper, therefore, statistical and empirical analysis of costs provided reference points. This approach is used for positioning stages of the engineering system’s lifetime with a minimal number of failures and costs, regardless of whether these are acceptable or not. The following three stages are usually identified: the beginning, the stationary part and the end of life. The boundaries between them are recognized on the basis of minimum total lifetime costs and on economic lifetime costs. Model is tested on the dozers, machines frequently used in the mining industry for the earthmoving operations, and which are characterized by high operating and maintenance costs.

Despite the considerable amount of research that has examined rework causation in construction, it remains an inherent problem that can potentially result in adverse project outcomes. This situation has arisen as studies have tended to ignore the social organization of errors (i.e. the pattern of relationships and social interactions between and among individuals and teams). Instead, studies have adopted a ‘reductionist view’ of rework causation by identifying its proximal and root causes rather than addressing the conditions resulting in its manifestation. This paper uses a case study approach with a sense-making lens to create a series of narratives of rework events that arose while constructing a transport mega-project. By making sense of the context surrounding the error events, it is revealed rework manifests from failures in ‘negotiated order’ which stems from role ambiguity, misunderstandings, misinterpretations, and break-downs in communications and interactions between people and organizations. As a consequence of these findings, their theoretical and practical implications arising from the research are discussed.

Communicating systems comprise diverse software components across networks. To ensure their robustness, modern programming languages such as Rust provide both strongly typed channels, whose usage is guaranteed to be affine (at most once), and cancellation operations over binary channels. For coordinating components to correctly communicate and synchronise with each other, we use the structuring mechanism from multiparty session types, extending it with affine communication channels and implicit/explicit cancellation mechanisms. This new typing discipline, affine multiparty session types (AMPST), ensures cancellation termination of multiple, independently running components and guarantees that communication will not get stuck due to error or abrupt termination. Guided by AMPST, we implemented an automated generation tool (MultiCrusty) of Rust APIs associated with cancellation termination algorithms, by which the Rust compiler auto-detects unsafe programs. Our evaluation shows that MultiCrusty provides an efficient mechanism for communication, synchronisation and propagation of the notifications of cancellation for arbitrary processes. We have implemented several usecases, including popular application protocols (OAuth, SMTP), and protocols with exception handling patterns (circuit breaker, distributed logging).

This artifact contains a version of MultiCrusty, a Rust library designed for writing and checking communication protocols following the Affine Multiparty Session Types theory introduced in our ECOOP'22 paper. MultiCrusty can work, and should be used, with Scribble [Yoshida et al., 2014] and kMC [{Julien} {Lange} and {Nobuko} {Yoshida}, 2019]: with the former tool, users can write correct global protocols and project them onto local Rust types defined within MultiCrusty, this approach is qualified as top-down; while the latter tool allows to check local Rust types written by users, this approach is qualified as bottom-up. Our artifact contains those three tools, their respective source files, as well as the different examples and benchmarks introduced in our paper, all together within a Docker image.

[EN] This study analyses the effect of climate change on water quality in the Júcar River Basin from future estimations of hydrological inputs and water temperature (WT). For this purpose, a large-scale water quality model was used to estimate the ecological status of all the water bodies, based on the concentrations of BDO5, P, NH4+ and NO3– for the future horizons 2020, 2050 and 2080. In this study, a greater number of water bodies with higher pollution levels (80-100% failures) were obtained in the horizons 2050 and 2080, which are located in the middle and lower parts of the basin. In addition, the degradation of BDO5 and the NH4+ is highly dependent on WT, highlighting the importance of considering this variable in the model., [ES] En este estudio se analiza el efecto del cambio climático en la calidad del agua de la cuenca del Júcar a partir de estimaciones futuras de aportaciones hidrológicas y temperatura del agua (Ta). Para ello, se utilizó un modelo de calidad de aguas a escala de cuenca con el que se estimó el estado ecológico de todas las masas de agua, basándose en las concentraciones de DBO5, P, NH4+ y NO3- para los horizontes futuros 2020, 2050 y 2080. De este análisis se obtuvo un incremento del número de masas con altos niveles de contaminación (80-100% incumplimientos) en los horizontes 2050 y 2080, localizadas sobre todo en la parte media y baja de la cuenca. Además, la degradación de la DBO5 y el NH4+ es muy dependiente de la temperatura del agua, poniendo de manifiesto la importancia de considerar esta variable en el modelo.

[ES] El tema propuesto para el Trabajo Final de Grado surge a partir de la realización de prácticas en una empresa de consultoría especializada en seguridad de procesos. La empresa asesora a sus clientes evaluando los riesgos del proceso y desarrollando soluciones prácticas. Recientemente un cliente dedicado a la industria del petróleo y del gas natural ha decidido desarrollar un proyecto de construcción de una nueva refinería de base integrada y un complejo petroquímico con todas sus instalaciones asociadas. Las compañías que trabajan en este sector presentan un alto riesgo de incendio y explosión debido a las propiedades de las sustancias que intervienen en los distintos procesos. Por esta razón, la empresa ha encargado la realización de un estudio específico para evaluar las consecuencias de posibles incendios y explosiones producidos en las nuevas instalaciones que podrían afectar a los elementos vulnerables situados alrededor de la nueva planta, como por ejemplo edificios ocupados y núcleos poblados. Para la realización del proyecto se va a llevar a cabo un FEA (Fire and Explosion Consequence Assessment) con la finalidad de evaluar las consecuencias (en términos de radiación térmica y sobrepresión) de posibles accidentes en la unidad inicial de la refinería cuyo objetivo es la destilación del crudo en diversas fracciones para su posterior procesamiento. En primer lugar, se identifican las secciones aislables más representativas del proceso en las cuales se utilizan sustancias peligrosas capaces de dañar personas, edificios y equipos debido a sus propiedades inflamables. Posteriormente se identificarán los posibles casos de fallo (genéricos y específicos) de los equipos relacionados y se analizarán las consecuencias asociadas a cada caso de fallo. El análisis de consecuencias se lleva a cabo mediante la simulación de cada evento iniciador desde la pérdida de contención hasta todas las posibles evoluciones con la ayuda de un software (PHAST) que trabaja bajo las, [EN] The theme proposed for the Final Degree Project arises from the realization of an internship in a company dedicated to process safety. The company advises its clients by assessing risks and developing practical solutions. Recently, a client dedicated to the oil and natural gas industry has decided to develop a construction project for a new integrated base refinery and a petrochemical complex with all its associated facilities. The companies that work in this sector present a high risk of fire and explosion due to the properties of the substances that intervene in the different processes. For this reason, the company has commissioned a specific study to assess the consequences of possible fires and explosions produced in the new facilities that could affect the vulnerable elements located around the new plant, such as occupied buildings and populated areas. In order to carry out the project, a FEA (Fire and Explosion Consequence Assessment) will be accomplished in order to evaluate the consequences (in terms of thermal radiation and overpressure) of possible accidents in the initial refinery unit whose objective is the distillation of crude oil into various fractions for further processing. First, the most representative isolatable sections of the process are identified in which hazardous substances capable of damaging people, buildings and equipment due to their flammable properties are used. Then, the possible failure cases (generic and specific) of the related equipment will be identified and the consequences associated with each failure case will be analysed. The consequence analysis is carried out by simulating each initiating event from the loss of containment to all possible evolutions with the help of software (PHAST) that works under the operating conditions of the process. This Final Degree Project describes the process that has been followed to identify and later analyse the consequences of possible process accidents that could occur in the crude oil

Network recoverability refers to the ability of a network to recover to a desired performance level after suffering topological perturbations such as link failures. The minimum number of driver nodes is a typical metric to denote the network controllability. In this paper, we propose closed-form analytic approximations for the minimum number of driver nodes to investigate the recoverability of network controllability under link-based perturbations in two scenarios: 1) only the links which are damaged in the failure process can be recovered and 2) links can be established between any pair of nodes that have no link between them after the failure process. Results show that our approximations fit well with simulation results both in synthetic networks and real-world networks, such as swarm signaling networks and some communication networks., Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public., Network Architectures and Services

Despite being widely implemented, sustainable urban drainage systems (SUDS) do not always function flawlessly. While SUDS have been tested extensively and seem to perform well on a laboratory or pilot scale, practitioners’ experience is different: failures in SUDS occur regularly in practice, resulting in malfunctioning systems, water nuisance and high costs. To anticipate their malfunctioning, and thus to improve their performance, a better understanding of failures occurring in SUDS and their underlying causes is needed. Based on an explorative case-study approach, consisting of site visits and semi-structured interviews with urban water professionals, this study presents an inventory of technical failures in SUDS and an analysis of their root causes. In total, 70 cases in 11 Dutch municipalities have been documented. The results show that the interfaces between SUDS and other urban systems are prominent failure locations. In addition, we found that failures originate from the entire development process of SUDS, i.e., from the design, construction and user/maintenance phase. With respect to the causes underlying these failures, our results show that these are mainly socio-institutional in nature. These are valuable insights for both practitioners and scholars, contributing to a renewed socio-technical urban water system with more sustainable water management practices., Sanitary Engineering, Water Resources

Employability and proactivity are believed to be key factors for survival in uncertain and unpredictable environments. Despite the related importance of continuous learning, little is known how learning-related factors enhance employability and proactivity. The purpose of this study was to examine the role of reflection in enhancing perceived employability and proactive behavior in turbulent conditions, drawing on positive psychology. A two-wave survey of Japanese employees (n = 408) was conducted during a pandemic period of coronavirus disease (COVID-19). Results of a structural equation model show that reflection on success had positive direct and indirect effects on perceived employability mediated through proactive behavior, while reflection on failures had no significant effect on perceived employability and proactive behavior. The findings extend prior research on employability and proactivity by examining the role of learning-related cognitive factors based on the broaden-and-build theory.

Employability and proactivity are believed to be key factors for survival in uncertain and unpredictable environments. Despite the related importance of continuous learning, little is known how learning-related factors enhance employability and proactivity. The purpose of this study was to examine the role of reflection in enhancing perceived employability and proactive behavior in turbulent conditions, drawing on positive psychology. A two-wave survey of Japanese employees (n = 408) was conducted during a pandemic period of coronavirus disease (COVID-19). Results of a structural equation model show that reflection on success had positive direct and indirect effects on perceived employability mediated through proactive behavior, while reflection on failures had no significant effect on perceived employability and proactive behavior. The findings extend prior research on employability and proactivity by examining the role of learning-related cognitive factors based on the broaden-and-build theory.

This essay proposes four reading axes that allow us to explore and organize some of the meanings found in Mariana Enriquez's short stories, collected in the volumes The dangers of smoking in bed (Enriquez, 2020a) and The things we lost in the fire (Enriquez, 2020b), and in the novel Our part of the night (Enriquez, 2020c). The first axis of reading, a writing of the margins, is the pivot around which the three remaining axes are made dynamic: failures, other worlds and underworlds., Este ensayo propone cuatro ejes de lectura que permiten explorar y organizar algunos de los sentidos que se encuentran en los cuentos de Mariana Enriquez, reunidos en los volúmenes Los peligros de fumar en la cama (Enriquez, 2020a) y Las cosas que perdimos en el fuego (Enriquez, 2020b), y en la novela Nuestra parte de noche (Enriquez, 2020c). El primer eje de lectura, una escritura de los márgenes, es el pivote en torno al cual se dinamizan los tres ejes restantes: fallas, otros mundos e inframundos.

Modern communication networks support fast path restoration mechanisms which allow to reroute traffic in case of (possibly multiple) link failures, in a completely decentralized manner and without requiring global route reconvergence. However, devising resilient path restoration algorithms is challenging as these algorithms need to be inherently local. Furthermore, the resulting failover paths often have to fulfill additional requirements related to the policy and function implemented by the network, such as the traversal of certain waypoints (e.g., a firewall). This paper presents local algorithms which ensure a maximally resilient path restoration for a large family of product graphs, including the widely used tori and generalized hypercube topologies. Our algorithms provably ensure that even under multiple link failures, traffic is rerouted to the other endpoint of every failed link whenever possible (i.e. detouring failed links), enforcing waypoints and hence accounting for the network policy. The algorithms are particularly well-suited for emerging segment routing networks based on label stacks.

A novel and innovative solution addressing wind turbines’ main bearing failure predictions using SCADA data is presented. This methodology enables to cut setup times and has more flexible requirements when compared to the current predictive algorithms. The proposed solution is entirely unsupervised as it does not require the labeling of data through work orders logs. Results of interpretable algorithms, which are tailored to capture specific aspects of main bearing failures, are merged into a combined health status indicator making use of Ensemble Learning principles. Based on multiple specialized indicators, the interpretability of the results is greater compared to black-box solutions that try to address the problem with a single complex algorithm. The proposed methodology has been tested on a dataset covering more than two year of operations from two onshore wind farms, counting a total of 84 turbines. All four main bearing failures are anticipated at least one month of time in advance. Combining individual indicators into a composed one proved effective with regard to all the tracked metrics. Accuracy of 95.1%, precision of 24.5% and F1 score of 38.5% are obtained averaging the values across the two windfarms. The encouraging results, the unsupervised nature and the flexibility and scalability of the proposed solution are appealing, making it particularly attractive for any online monitoring system used on single wind farms as well as entire wind turbine fleets., This research was funded by Centro para el Desarollo Tecnológico Industrial, grant number CDTI-IDI 20191294 and Agència de Gestió d’Ajuts Universitaris i de Recerca (AGAUR), grant number DOCTORADO AGAUR-2017-DI 004., Peer Reviewed, Objectius de Desenvolupament Sostenible::7 - Energia Assequible i No Contaminant, Postprint (published version)

Biosigurnost, doborbit, dobra proizvođačka praksa i analiza rizika u kritičnim kontrolim tačkama su veoma značajni elementi u intenzivnoj proizvodnji svinja. Planska primena biosigurnosnih mera je presudna u zaštiti zdravlja svinja i uspehu same proizvodnje. Cilj ovog preglednog rada je da prikaže procenu biosigurnosnih mera na komercijalnim farmama svinja i da ukaže na moguće propuste na farmama. U radu je diskutovano o mogućim rešenjima biosigurnosti na farmi i o rutinskim postupcima u zaštiti od moguće biološke kontaminacije na komercijalnim farmama kao i odnosu proizvođača prema zaštiti zdravlja svinja., Biosecurity, welfare, good production practice and risk analysis at critical control points are very important elements in intensive pig production. The planned application of biosecurity measures is crucial in the protection of pig health and the success of the production itself. The aim of this paper is to present an assessment of biosecurity measures on commercial pig farms and to point out possible omissions on farms. The paper discusses possible solutions for biosecurity on the farm as well as routine procedures in protection against possible biological contamination on commercial farms as well as the attitude of producers towards the protection of pig health.

Вступ. Ефективність функціонування телекомунікаційних систем, які відносяться до класу складних технічних систем, залежить від надійності складових її підсистем і елементів, а також складності зв'язків між ними. Метою статті є обґрунтування загального підходу до комплексної оцінки надійності телекомунікаційного обладнання телекомунікаційної мережі зі звідною структурою з розробкою методики розрахунку показників надійності обладнання. Основний матеріал. Формалізована постановка задачі. У розділі представлено опис проблеми в формалізованому вигляді, а також обмеження та допущення використовуються в наведеному дослідженні. Загальний підхід до вирішення задачі. Загальний підхід вирішення задачі базується на використанні принципу декомпозиції, який дозволяє поетапно проводити оцінку надійності телекомунікаційної мережі на трьох взаємопов'язаних рівнях: перший етап – на рівні окремих елементів обладнання (таких типових пристроїв, як маршрутизатори, комутатори, сервера, робочі станції, апаратура IP-шифрування і т.д.), в яких можуть бути передбачені окремо або спільно різні види резервування: структурного, навантажувального, часового; другий етап – на рівні телекомунікаційного обладнання інформаційних шляхів (маршрутів); третій етап – на рівні телекомунікаційного обладнання інформаційних напрямків, які представляють собою сукупність обладнання різних шляхів. Методика вирішення задачі. Запропоновано методику комплексної оцінки надійності телекомунікаційного обладнання мереж звʼязку зі звідною структурою, що враховує сукупність факторів, одні з яких є агресивними і призводять до зниження надійності (збої, що викликають короткочасні перериви у функціонуванні; стійкі відмови обладнання, які потребують відновлення працездатності пристроїв, що відмовили у ремонтному органі ; недостатня кваліфікація обслуговуючого персоналу), а інші – підтримують нормальне функціонування телекомунікаційного обладнання на заданому рівні (використання окремо або спільно різних видів резервування – с

© ACM, 2020. This is the author's version of the work. It is posted here by permission of ACM for your personal use. Not for redistribution. The definitive version was published in ACM Computing Surveys, Vol. 53, No. 5, Article 95. Publication date: September 2020. https://doi.org/10.1145/3403956, [EN] Performance and power constraints come together with Complementary Metal Oxide Semiconductor technology scaling in future Exascale systems. Technology scaling makes each individual transistor more prone to faults and, due to the exponential increase in the number of devices per chip, to higher system fault rates. Consequently, High-performance Computing (HPC) systems need to integrate prediction, detection, and recovery mechanisms to cope with faults efficiently. This article reviews fault detection, fault prediction, and recovery techniques in HPC systems, from electronics to system level. We analyze their strengths and limitations. Finally, we identify the promising paths to meet the reliability levels of Exascale systems.

Each of the two Large Hadron Collider (LHC) beams contain 362 MJ of energy. This will be further increased to 678 MJ in the upcoming upgrade to the High Luminosity LHC (HL-LHC). In the event of an uncontrolled beam loss, a significant hazard occurs, that can damage the machine components. This thesis is focused on failures that can lead to a fast increase of beam losses, with a focus on the new optics and equipment in the HL-LHC. The criticality for a number of failure scenarios is studied, under different optics configurations of the machine. Mitigation strategies, involving dedicated interlocking and a reduction of the impact that the failures have on the beam are proposed for the most critical scenarios. For a number of less critical failures it is determined that current interlock strategies are sufficient. Failures involving the magnet protection and the crab cavities constitute the most severe hazards. The former consists of quench heaters and a new system known as coupling loss induced quench (CLIQ). A new connection scheme is proposed for these, in order to limit their effect on the beam. Dedicated interlocks for detecting spurious discharges of these systems are also found to be necessary. The perturbation of the beam orbit caused by the extraction of only one beam is another source of uncontrolled beam losses. A fast hardware linking of the two beams to limit the delay between extracting the two beams of maximum one LHC turn (89 µs) is found to be necessary. Beam-dust interactions have detrimental effects on the machine performance and availability. Advances are made on the understanding of their dynamics through dedicated experiments combined with theoretical work and simulations. Superconducting magnet quenches are shown capable of causing fast orbit perturbations. The effects of beam-beam compensating wires as well as coherent excitations by the transverse beam damper are also discussed. Finally, realistic combinations of multiple failures, Supported by the High Luminosity LHC project

Diversity of thoughts related to theoretical knowledge and economic political practices; discoveries in the field of economic analysis; the intervention of new technologies; statistics; and, new techniques for monitoring economies, have not succeeded in removing discrepancies; there are now major market failures. The rulers in Ecuador, were and are chosen by sympathy, most voters do not analyze the plan of government that each voter must submit during their candidacy and the beginning of the first year of management. On the other hand, the continuous change of ideologies, initiating when the state should not intervene in the market assuming that things would improve on their own (Neoliberal politics); and then, when the state decides to intervene in the market, creating an artificial economy (neo-Keynesian politics). This study was based on documentary-based analytical research, using inductive, analytical and synthesis research methods. Concluding that there is no defined policy in Ecuador, which we would say applies to it as appropriate as the nominated authorities., La diversidad de pensamientos relacionados con el saber teórico y las prácticas políticas económicas, los descubrimientos en el campo del análisis económico, la intervención de la nuevas tecnologías, la estadística, y las nuevas técnicas para seguimiento de las economías, no han lograron que las discrepancias se eliminen; en la actualidad existen grandes fallos en el mercado. Los gobernantes en Ecuador fueron y son elegidos por simpatía, la mayoría de los votantes no analizan el plan de gobierno que cada elector debe presentar durante su candidatura e inicio del primer año de gestión. Por otro lado, el continuo cambio de ideologías, iniciando cuando el Estado no debe intervenir en el mercado suponiendo que las cosas se mejorarían por sí solas (política neoliberal); y posteriormente, cuando el Estado decide intervenir en el mercado, creando una economía artificial (política neokeynesiana). Este estudio se fundamentó en una investigación analítica de base documental, usamos como método de investigación el inductivo, analítico y de síntesis. Obteniendo como conclusión que en el Ecuador no se observa una política definida, lo que diríamos que esta se aplica según la conveniencia de las autoridades nominadas.

Diversity of thoughts related to theoretical knowledge and economic political practices; discoveries in the field of economic analysis; the intervention of new technologies; statistics; and, new techniques for monitoring economies, have not succeeded in removing discrepancies; there are now major market failures. The rulers in Ecuador, were and are chosen by sympathy, most voters do not analyze the plan of government that each voter must submit during their candidacy and the beginning of the first year of management. On the other hand, the continuous change of ideologies, initiating when the state should not intervene in the market assuming that things would improve on their own (Neoliberal politics); and then, when the state decides to intervene in the market, creating an artificial economy (neo-Keynesian politics). This study was based on documentary-based analytical research, using inductive, analytical and synthesis research methods. Concluding that there is no defined policy in Ecuador, which we would say applies to it as appropriate as the nominated authorities., La diversidad de pensamientos relacionados con el saber teórico y las prácticas políticas económicas, los descubrimientos en el campo del análisis económico, la intervención de la nuevas tecnologías, la estadística, y las nuevas técnicas para seguimiento de las economías, no han lograron que las discrepancias se eliminen; en la actualidad existen grandes fallos en el mercado. Los gobernantes en Ecuador fueron y son elegidos por simpatía, la mayoría de los votantes no analizan el plan de gobierno que cada elector debe presentar durante su candidatura e inicio del primer año de gestión. Por otro lado, el continuo cambio de ideologías, iniciando cuando el Estado no debe intervenir en el mercado suponiendo que las cosas se mejorarían por sí solas (política neoliberal); y posteriormente, cuando el Estado decide intervenir en el mercado, creando una economía artificial (política neokeynesiana). Este estudio se fundamentó en una investigación analítica de base documental, usamos como método de investigación el inductivo, analítico y de síntesis. Obteniendo como conclusión que en el Ecuador no se observa una política definida, lo que diríamos que esta se aplica según la conveniencia de las autoridades nominadas.

The condensing unit is one of the most important elements of the steam turbine of a combined heat and power plant. Defects in elements of the condensing unit lead to disturbances in the steam turbine operation, its failures and breakdowns, as well as efficiency losses of the plant. Therefore, the operating personnel need to know the cause of the malfunction and to correct it immediately. There are no diagnostic models of condensers in the Republic of Kazakhstan at the moment. In this regard, a mathematical model of a condenser based on the methodology of Kaluga Turbine Plant (KTP) has been developed. The mathematical model makes it possible to change the input parameters, plot dependency diagrams, and calculate the plant efficiency indicators. The mathematical model of the condenser can be used to research ways for the improvement of the condensing unit efficiency, for diagnostic purposes of the equipment condition, for the energy audit conduction of the plant, and in the training when performing virtual laboratory research. Using static data processing by linear regression method we obtain that the KTP methodology of condenser calculation is fair at cooling water temperature from 20 °C to 24 °C, but at cooling water temperature from 20 °C to 28 °C, the methodology of JSC "All-Russia Thermal Engineering Institute" (JSC "VTI") is used. One of the ways to increase the condenser efficiency has been proposed. It is the heat transfer augmentation with riffling annular grooves on tubes. This method increases the heat transfer coefficient by 2%, reduces the water subcooling of the heating steam by 0.9 °C, and decreases the cooling area by 2%. © 2020 Institut za Istrazivanja. All rights reserved.

Purpose - Although positive psychology emphasizes the importance of reflecting on success in promoting strengths use and self-efficacy, no research has developed a measure of reflection on success. The purpose of this study is to develop and validate the scales for reflection on success and failures. Design/methodology/approach - Study 1 was conducted to extract the dimensions of reflection on success and failures using survey data from nurses (n = 298), whereas Study 2 involved validation of the scales using a two-wave survey of physical therapists (n = 291). Findings - In Study 1, the factors of "reflection on success" and "reflection on failures" were extracted by exploratory factor analysis. In Study 2, the discriminant validity of the two scales was established via confirmatory factor analyses. The structural equation modeling results indicated that reflection on success promoted work authenticity, work engagement and strengths use, while reflection on failures only promoted work engagement, indicating the convergent validity of the scales. Research limitations/implications - As the research subjects were medical professionals in Japan, the scales need to be validated with samples from a wide range of occupations and cultural backgrounds, in future research. Originality/value - The present research expands the literature on reflection and strengths-based approach by introducing the "success-failures" dimension based on positive psychology, broaden-and-build theory and job demands-resources theory.

Hoy en día, y desde hace mucho tiempo, la electricidad forma parte de la vida cotidiana de todos, hasta el punto de no podernos imaginar la vida sin ella. Actualmente, se puede considerar un bien básico de primera necesidad cuyo acceso debe ser garantizado. Su gran importancia conlleva que las compañías eléctricas que la gestionan y la distribuyen deban ser eficientes y se aseguren de abastecer tal servicio. Pero en todo sistema se producen fallos. Ya sean leves o graves, deben ser solucionados, especialmente en un sistema tan crítico y necesario como supone la red eléctrica, de manera que las compañías eléctricas disponen de técnicos especializados para poder reparar los posibles fallos en la red. En el momento que sucede cualquier error, es importante no solamente solucionarlo con inmediatez, sino dejar constancia de ello y poder gestionarlo adecuadamente para poder asignar al técnico o técnica más apropiado para arreglar la incidencia en cuestión. En el caso que no se llevase a cabo, es muy probable que existan errores que no se solucionen o que se pierda tiempo, energía y recursos extra a consecuencia de una mala gestión. El siguiente proyecto parte de la colaboración de Minsait, una empresa afiliada a Indra, que tratará de solucionar este problema para una compañía eléctrica, la cual requiere un sistema de gestión de incidencias en las instalaciones de su red eléctrica. Actualmente, esta compañía dispone de un sistema de gestión para los elementos de su red eléctrica, donde se dispone de un apartado que se encarga de la gestión de averías en el sistema, el cual es limitado. No obstante, este sistema es muy complejo y poco usable, a la vez que no especifica cómo se gestionan las incidencias de manera clara y puede confundir a los técnicos o técnicas. Por estos motivos, se ha decidido hacer el siguiente proyecto, el cual busca desarrollar un sistema externo al ya existente que sea capaz de gestionar las incidencias de red de manera simple, usable, a distancia, y, Nowadays, and for a long time, electricity has been part of everyone's daily life, to the point that we could not imagine life without it. It can be considered a basic good of first necessity, whose access must be guaranteed. Its great importance means that the electricity companies that manage and distribute it must be efficient and ensure that they provide this service. But in every system there are failures. Whether they are minor or serious, they must be solved, especially in a system as critical and necessary as an electrical network, resulting in the electrical companies having specialized technicians to repair possible failures in the network. When any failure occurs, it is important not only to solve it immediately, but also to record it and to be able to manage it properly in order to assign the most appropriate technician to fix said incident. If this is not done, it is very likely that there are mistakes that will not solved or that extra time, energy and resources are lost as a result of bad management. The following project is based on the collaboration of Minsait, a company affiliated to Indra, which will try to solve this problem for an electric company, which requires an incident management system in its electric network facilities. Currently, this company has a management system for the elements of its electrical network, where there is a section in charge of managing breakdowns in the system, which is limited. However, this system is very complex and not very usable, and it does not specify how incidents are managed clearly and can confuse technicians. For these reasons, it has been decided to carry out the following project, which seeks to develop an external system to the existing one that is capable of managing network incidents in a simple, usable, remote way, and in general, more comfortable for technicians. In addition, this will allow the client company to save both time and resources, and provide more security to an indispensable resource i

Performance and power constraints come together with Complementary Metal Oxide Semiconductor technology scaling in future Exascale systems. Technology scaling makes each individual transistor more prone to faults and, due to the exponential increase in the number of devices per chip, to higher system fault rates. Consequently, High-performance Computing (HPC) systems need to integrate prediction, detection, and recovery mechanisms to cope with faults efficiently. This article reviews fault detection, fault prediction, and recovery techniques in HPC systems, from electronics to system level. We analyze their strengths and limitations. Finally, we identify the promising paths to meet the reliability levels of Exascale systems., This work has received funding from the European Union’s Horizon 2020 (H2020) research and innovation program under the FET-HPC Grant Agreement No. 801137 (RECIPE). Jaume Abella was also partially supported by the Ministry of Economy and Competitiveness of Spain under Contract No. TIN2015-65316-P and under Ramon y Cajal Postdoctoral Fellowship No. RYC-2013-14717, as well as by the HiPEAC Network of Excellence. Ramon Canal is partially supported by the Generalitat de Catalunya under Contract No. 2017SGR0962., Peer Reviewed, Postprint (author's final draft)

Purpose - Although positive psychology emphasizes the importance of reflecting on success in promoting strengths use and self-efficacy, no research has developed a measure of reflection on success. The purpose of this study is to develop and validate the scales for reflection on success and failures. Design/methodology/approach - Study 1 was conducted to extract the dimensions of reflection on success and failures using survey data from nurses (n = 298), whereas Study 2 involved validation of the scales using a two-wave survey of physical therapists (n = 291). Findings - In Study 1, the factors of "reflection on success" and "reflection on failures" were extracted by exploratory factor analysis. In Study 2, the discriminant validity of the two scales was established via confirmatory factor analyses. The structural equation modeling results indicated that reflection on success promoted work authenticity, work engagement and strengths use, while reflection on failures only promoted work engagement, indicating the convergent validity of the scales. Research limitations/implications - As the research subjects were medical professionals in Japan, the scales need to be validated with samples from a wide range of occupations and cultural backgrounds, in future research. Originality/value - The present research expands the literature on reflection and strengths-based approach by introducing the "success-failures" dimension based on positive psychology, broaden-and-build theory and job demands-resources theory.

A deserted tower at the Uithof Campus of Utrecht University used to be an astronomical observatory, purpose-built for Marcel Minnaert’s famous undergraduate course in practical astronomy. The tower, which was opened in 1964, has hardly been used, however. This was in part because of unforeseen campus development, but also because of shifting teaching priorities. This paper reconstructs the history of Minnaert’s ‘Sterrentoren’, which illustrates how failed observatories can shed as much light on the history of astronomy as successful ones.

В статье рассмотрена возможность управления надежностью локомотивов путем внедрения комплексной системы RAMS. Применение одного из инструментов FRACAS, используемого в системе RAMS позволяет создать базу знаний, которая обеспечит формирование полной, объективной структурированной информации о неисправностях, отказах и событиях, связанных с возникновением отказов., The article considers the possibility of controlling the reliability of locomotives by introducing an integrated system RAMS. The use of one of the FRACAS means used in the RAMS system allows you to create a knowledge base that will ensure the formation of complete, objective, structured information about faults, failures and events associated with the occurrence of failures.

[ES] Tras la valoración de las distintas alternativas, se ha determinado una propuestas óptima a partir de dos modelos ideados. Posteriormente, se ha realizado una descripción detallada de la solución, teniendo en cuenta factores como los materiales, las necesidades para la obtención del revelado de las fotografías, la resistencia estructural del producto, los procesos industriales necesarios para su fabricación y el embalaje., [EN] This project aims to design and develop a furniture for the reveal of photographs. After evaluating the different alternatives, an optimal proposal has been determined from two models devised. Subsequently, it has been a detailed description of the solution, taking into account factors such as materials, the needs for obtaining the development of photographs, the structural strength of the product, the industrial processes necessary for its manufacture and packaging.

Background: Cartilage defects often are treated with different techniques depending on the surgeon's preferences and technical availability. A more systematic approach is therefore needed as a practical guide for surgeons regarding the choice of a suitable treatment for a particular patient. Methods: A retrospective descriptive study was done on 40 patients operated on with one of the following techniques: arthroscopic microfracture, periosteal transplantation and assisted matrix induced chondrogenesis (AMIC) technique. The average age of patients was 30.5 yr, with a minimum of 12 and a maximum of 54 yr. The average size of the injury was 2.67 cm(2), with a minimum of 1 cm(2) and a maximum of 6 cm(2). The distribution of the injuries was as follows: trochlea 22.5%, medial femoral condyle 45%, patella 30%, and lateral femoral condyle 2.5%. Results: The proportion of patients who were not satisfied was 21% after 1-year follow-up. The proportion of reoperated patients was 12.5%. The proportion of patients operated on previously was 12.5%. The proportion of patients with multiple chondral defects was 7.5%. Younger patients fared better. Conclusions: Microfracture as the primary technique led to the most failures, but because of its simplicity and balanced clinical results, it should be used as the gold standard, especially in younger patients. Open techniques, AMIC, and periosteal transplantation should be reserved as second choice treatments after failure and as a first choice treatment for multiple lesions, larger defects, older patients, and for defects such as osteochondritis dissecans where there is a need for autologous cancellous bone transplantation.

In this paper, we present the history, the concept and the results of " Attempts, Failures, Trials and Errors" exhibition project which was first presented in the frame of Piksel Festival in Bergen, Norway (November 2017) and later on at " Salonul de Proiecte", Bucharest, Romania (February 2018). The project aimed to incite the e-textiles artists and designers to reflect upon the way they are engaging with their failures, as well as to the way in which they use these failures to better understand the context in which they are working and to continue to experiment. Our approach reverses the common R& D constructivist methods, by using deconstruction as a process of investigation in the field of wearable technologies and e-textiles. By questioning the ideas and the concepts of failure and success, the project puts an emphasis on art's capacity to be critical, while at the same time to poetically and self-ironically address contemporary challenges and concerns., QC 20190620

This article takes a critical look at comparative analysis of the Charter of the Organization of African Unity (OAU) and the Constitutive Act of the African Union (AU). In doing so, the article will compare the organs and institutions of both the OAU and the AU. It will also access the achievements and failures of the two bodies and in doing this, the article will argue that if OAU has been performing as expected, there will be no need for the AU. It will in addition go further to list some provisions in the Constitutive Act of the AU that were not included in the Charter of the OAU. It will also argue that in modeling the AU like the European Union (EU), there has been no linkage in the achievements of this continental body that can make it comparable to the EU. Also, in accessing the AU, this paper will proffer answer to the question, whether there has been any significant change since AU come on board, or if it was just a name change. Finally, the article will conclude by making recommendations and suggestions for better performance of the continental body before it clocks twenty (20) years.

The SENA`s CIES Centre (Industry, Enterprise and Services Centre). Of the North of Santander is responsible for investing in the social and technical development of Colombian workers in comprehensive professional training, with a wide range of assets for its entire line of training. A preventive maintenance plan was made for the equipment of the industrial mechanical maintenance training environments, machining of metalworking products, diesel transmission mechanics, maintenance of diesel engines and automotive electromechanical maintenance.This maintenance plan is carried out in stages, the first stage is the characterization of the equipment, by the identification of these and the collection of technical information, thus achieving the technical specifications of all the equipment. As a second stage the equipment were classified for their maintainability and criticality, classifying the equipment in critical and non-critical. As a third stage, a failure mode effect analysis (AMEF by its initials in Spanish) was implemented to the equipment classified as critical. With the identification of the main failures and the actions recommended by the manufacturers, the protocols and schedules of the selected assets were created.Once all this information was collected, data sheets for the equipment were created, necessary for the correct implementation of the preventive maintenance plan. Finally, with the help of the maintenance indicators, the continuous improvement of the equipment will be guaranteed, thus increasing its reliability and availability., El Centro CIES del SENA (Centro de Industria, Empresa y Servicios). Del Norte de Santander se encarga de invertir en el desarrollo social y técnico de los trabajadores colombianos en formación profesional integral, con una amplia gama de activos para toda su línea de formación.Se elaboró un plan de mantenimiento preventivo para los equipos de los entornos de formación en mantenimiento mecánico industrial, mecanizado de productos metalúrgicos, mecánica de transmisión diesel, mantenimiento de motores diesel y mantenimiento electromecánico de automoción.Este plan de mantenimiento se realiza en etapas, la primera etapa es la caracterización de los equipos, mediante la identificación de los mismos y la recolección de información técnica, logrando así las especificaciones técnicas de todos los equipos. En una segunda etapa se clasificaron los equipos por su mantenibilidad y criticidad, clasificando los equipos en críticos y no críticos. Como tercera etapa, se implementó un análisis de modo de efecto de falla (AMEF) a los equipos clasificados como críticos. Con la identificación de las principales fallas y las acciones recomendadas por los fabricantes, se crearon los protocolos y cronogramas de los activos seleccionados. Una vez recopilada toda esta información, se elaboraron las fichas técnicas de los equipos, necesarias para la correcta implantación del plan de mantenimiento preventivo. Finalmente, con la ayuda de los indicadores de mantenimiento, se garantizará la mejora continua de los equipos, aumentando así su fiabilidad y disponibilidad