Social networks and performance in knowledge creation. An application and a methodological proposal

El objetivo de esta tesis es predecir el rendimiento de los estudiantes de doctorado en la Universidad de Girona según características personales (background), actitudinales y de redes sociales de los estudiantes. La población estudiada son estudiantes de tercer y cuarto curso de doctorado y sus directores de tesis doctoral. Para obtener los datos se ha diseño un cuestionario web especificando sus ventajas y teniendo en cuenta algunos problemas tradicionales de no cobertura o no respuesta. El cuestionario web se hizo debido a la complejidad que comportan de las preguntas de red social. El cuestionario electrónico permite, mediante una serie de instrucciones, reducir el tiempo para responder y hacerlo menos cargado. Este cuestionario web, además es auto administrado, lo cual nos permite, según la literatura, unas respuestas mas honestas que cuestionario con encuestador. Se analiza la calidad de las preguntas de red social en cuestionario web para datos egocéntricos. Para eso se calcula la fiabilidad y la validez de este tipo de preguntas, por primera vez a través del modelo Multirasgo Multimétodo (Multitrait Multimethod). Al ser datos egocéntricos, se pueden considerar jerárquicos, y por primera vez se una un modelo Multirasgo Multimétodo Multinivel (multilevel Multitrait Multimethod). Las la fiabilidad y validez se pueden obtener a nivel individual (within group component) o a nivel de grupo (between group component) y se usan para llevar a cabo un meta-análisis con otras universidades europeas para analizar ciertas características de diseño del cuestionario. Estas características analizan si para preguntas de red social hechas en cuestionarios web son más fiables y validas hechas "by questions" o "by alters", si son presentes todas las etiquetas de frecuencia para los ítems o solo la del inicio y final, o si es mejor que el diseño del cuestionario esté en con color o blanco y negro. También se analiza la calidad de la red social en conjunto, en este caso específico son los grupos de investigación de la universidad. Se tratan los problemas de los datos ausentes en las redes completas. Se propone una nueva alternativa a la solución típica de la red egocéntrica o los respondientes proxies. Esta nueva alternativa la hemos nombrado "Nosduocentered Network" (red Nosduocentrada), se basa en dos actores centrales en una red. Estimando modelos de regresión, esta "Nosduocentered network" tiene mas poder predictivo para el rendimiento de los estudiantes de doctorado que la red egocéntrica. Además se corrigen las correlaciones de las variables actitudinales por atenuación debido al pequeño tamaño muestral. Finalmente, se hacen regresiones de los tres tipos de variables (background, actitudinales y de red social) y luego se combinan para analizar cual para predice mejor el rendimiento (según publicaciones académicas) de los estudiantes de doctorado. Los resultados nos llevan a predecir el rendimiento académico de los estudiantes de doctorado depende de variables personales (background) i actitudinales. Asimismo, se comparan los resultados obtenidos con otros estudios publicados.

Les grans infrastructures de transport i el desenvolupament de la ciutat mitjana. El Tren d'Alta Velocitat a les ciutats de Lleida, Avinyó i Novara

L'objectiu central de la tesi és estudiar els processos que permeten aconseguir un desenvolupament local a llarg termini de les ciutats mitjanes a partir de la implantació d'una gran infrastructura com el Tren d'Alta Velocitat (TAV). Es parteix de la hipòtesi que el desenvolupament local urbà a partir del TAV depèn de factors objectius i de factors subjectius (dels subjectes), uns factors que prenen una forma particular en el desenvolupament de les ciutats mitjanes. La tesi es divideix en una primera part teòrica i segona de més aplicada. Diversos autors han arribat a la conclusió que la relació tradicional que s'ha donat entre les infrastructures de transport i territori parteix d'uns paradigmes deterministes, que s'exemplifiquen amb una relació de "causa-efecte". Per aquest motiu, s'han criticat els estudis sobre els efectes socioeconòmics de les infrastructures de transport, així com el mateix concepte d'"efecte". Aquesta crítica es repeteix els estudis sobre el TAV i les ciutats mitjanes, que arriben a la conclusió que el desenvolupament econòmic no és un fet automàtic i que no es poden predir les conseqüències a mig i llarg termini del TAV. El desenvolupament local a partir del TAV, doncs, estaria relacionat amb tres elements principals. En primer lloc, entendre que la ciutat -i el territori- és un fenomen complex i, com a tal, cal abordar-lo des de la teoria dels sistemes complexos. En segon lloc, la gran infrastructura ha de convertir-se en un recurs endogen (interconnexió amb la xarxa local d'actors i territorialització en el milieu de la ciutat) per a que pugui contribuir al desenvolupament. En tercer lloc, la dinàmica de governance dels actors és primordial, i es divideix en la gestió interna de la xarxa local (projecte local) i la gestió multinivell de les administracions. En base als referents teòrics, es construeix una metodologia per avaluar el grau de desenvolupament local que ha comportat el TAV en tres ciutats mitjanes de l'arc mediterrani europeu, Lleida, Avinyó i Novara, situades respectivament a Espanya, França i Itàlia. La metodologia preveu l'estudi d'aspectes tècnics de la ciutat com els de transport (Posició territorial de la ciutat a partir del TAV, Característiques de l'estació TAV), urbanístics (Model urbanístic a escala municipal/urbana, Model urbanístic a escala de l'estació) i econòmics (Diferents projectes econòmics de la ciutat relacionats amb el TAV). També preveu l'estudi d'aspectes organitzatius externs (Els agents supralocals i els seus projectes, Grau de conflictivitat i cooperació en les relacions dels agents locals i supralocals) i interns (Capacitat de creació d'un projecte de ciutat a partir del TAV, Agents que participen en el projecte local i la seva dinàmica, Àmbit territorial dels projectes). Finalment s'efectua una avaluació del procés i dels resultats del desenvolupament local. Com a conclusió es demostra que el procés de desenvolupament local a partir de les grans infrastructures de transport depèn, en bon part, de la capacitat de governance. Depèn, per un cantó, de la capacitat dels agents locals d'elaborar un projecte de desenvolupament i liderar unes estratègies d'aprofitament i, de l'altre, de la capacitat dels agents del territori (estatals, regionals, locals) de crear aliances i cooperació per planificar la infrastructura de transport. Finalment es presenten un seguit de recomanacions a les ciutats que volen planificar l'arribada del TAV per a que contribueixi a un desenvolupament amb les característiques d'eficàcia, sostenibilitat, productivitat i equitat.

Causas de abandono do desporto escolar

RESUMO: Numa sociedade cada vez mais exigente, onde o acesso a estudos e estatísticas se torna cada vez mais fácil, deve consciencializar-se os intervenientes no contexto desportivo para a falta de actividade física e desportiva dos nossos jovens no seu dia-a-dia, bem como o seu abandono precoce da prática desportiva. Esse abandono apresenta-se como um fenómeno multifactorial, na medida em que são diversos os contextos e motivos que o determinam. Na actividade diária de professores/treinadores, os aspectos relacionados com os factores que conduzem ao abandono dos praticantes devem merecer uma atenção permanente. Torna-se importante responder às perguntas “o abandono surge porquê?”; “Quais as causas?” ou “Quais os factores?”, sendo esse o principal objectivo deste estudo. A amostra foi constituída por alunos de ambos os sexos, de diversas escolas de Lisboa, num total de 174 inquiridos dos ensinos básico e secundário, que abandonaram a prática do desporto escolar durante o ano lectivo 2011/2012. Foi aplicado como instrumento de medida o Questionário de Razões para o Abandono da Prática do Desporto Escolar – QRAPDE versão adaptada para o desporto escolar com base num instrumento similar desenvolvido por Cruz e colaboradores (1988; 1995). Os resultados evidenciam como causas mais importantes para o abandono as questões relacionadas com a dimensão “Falta de tempo” com média de 1,84, seguida da dimensão “Orientação desportiva” apresentando uma média de 1,44 e, como causa menos importante, a dimensão “Indicadores de treino e competição” (1,26). A todos os intervenientes desportivos, especialmente professores, cabe uma introspecção sobre os factores de abandono. Acreditamos que com uma orientação consciente e sustentada será possível inverter o abandono do desporto escolar pelos alunos.ABSTACT: In an increasingly demanding society, where access to studies and statistics is becoming rather easy, all subjects for sport activities must be aware concerning the lack of physical and sports activity of our young people in their day-to-day life, as well as the early withdrawn. This dropout mus be presented as a multifactorial phenomenon, as there are several contexts and motives which determine it. In daily work of teachers/coaches, aspects related to the factors that lead to the abandonment of the youngsters deserve continued attention. Therefore, it is important to answer the questions "Why does abandonment arises?" "What are the causes?" or "What are the factors? This is the key issue and the goal of this study. The sample was 174 students of both genders, of elementary and secondary school grade, from several schools in Lisbon, who had abandoned the practice of school sports during the academic year 2011/2012. To determine the reasons of dropout we use the Questionnaire of Reasons for the Abandonment of School Sports – QRAPDE, version adapted for school sports based on a similar instrument developed by Cruz et al (1988; 1995) The results show that the most important causes for the abandonment are related to the dimension "lack of time" with an average of 1.84, followed by the dimension "Sports Guidance" with an average of 1.44, and, as the less important cause, the "Indicators of training and competition" (1.26). All responsible intervenients, namely teachers, should thoroughly reflect about the factors of dropout. We believe that with a conscious and sustainable guidance it will be possible to reverse the abandonment of school sports by students.

Facebook e inovação pedagógica : um projeto de autoformação

A investigadora fixou o objetivo de se atualizar a nível profissional, por autoformação. Considera ser relevante para o ensino que se aposte em estratégias /atividades inovadoras sob um ponto de vista pedagógico, assentes nas novas tecnologias. Neste contexto, a questão de partida foi: como pode a docente inovar na sua prática pedagógica com impacto no desenvolvimento das suas competências digitais e profissionais? Pode inovar, explorando, a nível educativo, as caraterísticas de uma rede social como o Facebook, que é intuitiva e permite o acesso por computador. Além disso, aposta na natureza ubíqua, desenhada para Tablet ou telemóvel, em mobilidade. Possibilita a comunicação síncrona e assíncrona. Pode ser rentabilizada em dois níveis: no da Web 1.0, para pesquisa e arquivo; e no da Web 2.0, para criação/cocriação. Nesta investigação, o paradigma da Web 2.0 facultou a conceção de uma Wiki e de outros produtos criativos. Sendo inábil em tecnologia digital, a docente investigadora pretendeu inverter a situação ao começar pelo Facebook, que se revelou uma forma muito pragmática de ir aprendendo, paulatinamente, a operar outras ferramentas digitais e de consolidar uma autoformação em espiral ascendente. O Trabalho de Projeto, de que ora se lavra este relatório, seguiu a metodologia de investigação-ação, pelo modelo de Whitehead (1989). Foram cinco fases distintas: desde a identificação do problema até à sua superação, passando pelas fases intermédias de planificação do trabalho e de implementação. A última fase foi a reformulação, isto é, a planificação do ano letivo seguinte, com base na experimentação anterior e nos resultados obtidos. Dos resultados obtidos, destacam-se os seguintes: os discentes empenharam-se nas inovações digital e pedagógica porque compreenderam que a docente as concebeu para eles e eram adequadas às suas capacidades; elucidaram a docente, quando esta teve dúvidas de ordem digital; aprovaram o método eclético que concilia o tradicional com o moderno, sem exageros; apreciaram que a docente se implicasse, conferindo um cunho pessoal às aulas; aceitaram bem a entrada do Facebook em meio escolar, com a associação do telemóvel, para partilha de informação e de conhecimento; o Facebook ajudou a docente a desenvolver as aprendizagens tecnológicas e a comunicar com os alunos; os intervenientes reconheceram que podem criar produtos propositadamente para exibir na página, entrando portanto, na Web 2.0.

Integración europea y parlamentos nacionales (Artículos Varios)

La interconexión y dependencia recíproca entre Derecho comunitario y constituciones nacionales están aceptadas en la actualidad como un lugar común en el Derecho Público europeo, resultando casi explícitas en conceptos ya acuñados como el de multilevel constitutionalism de Pernice o el ""constitucionalismo dual"" de von Bogdandy. El artículo se detiene en el análisis de las influencia y del complejo juego de relaciones entre parlamentos nacionales y Unión Europea, en marcándose claramente en el nuevo constitucionalismo europeo ""multinivel"". En él se analiza la interdependencia entre Derecho comunitario y derechos nacionales en materia parlamentaria. De modo descriptivo y analítico se estudia el papel que los parlamentos nacionales pueden y deben representar en el proceso de integración europea así como en la bl.Jsqueda de su mayor democratización y se ofrecen los elementos necesarios para valorar jurídicamente en qué medida realmente lo representan.

Women's Labour Market Performance in Europe: Trends and Shaping Factors. CEPS Special Report, September 2012

We investigate the changes in women’s employment patterns across EU countries over the last 20 years both in terms of labour market participation and type of jobs using individual data from ECHP and EUSILC databases. Using a logistic multilevel model, we then pin down the role played by institutional and policy changes in explaining women’s employment. The key results indicate that women’s employment trends are related to the institutional and policy changes that have been introduced in almost all European countries since the end of the 1990s. Such changes had an important impact on the labour market opportunities’ of women by affecting the quality of potential jobs available, the chances to (re-)enter the labour market and the opportunity costs of employment (vs. non-employment).

Multi-level Input Fusion in multi-modal systems

Context-aware multimodal interactive systems aim to adapt to the needs and behavioural patterns of users and offer a way forward for enhancing the efficacy and quality of experience (QoE) in human-computer interaction. The various modalities that constribute to such systems each provide a specific uni-modal response that is integratively presented as a multi-modal interface capable of interpretation of multi-modal user input and appropriately responding to it through dynamically adapted multi-modal interactive flow management , This paper presents an initial background study in the context of the first phase of a PhD research programme in the area of optimisation of data fusion techniques to serve multimodal interactivite systems, their applications and requirements.

Can the dynamical impact of the stratosphere on the troposphere be described by large-scale adjustment to the stratospheric PV distribution?

Recent numerical experiments have demonstrated that the state of the stratosphere has a dynamical impact on the state of the troposphere. To account for such an effect, a number of mechanisms have been proposed in the literature, all of which amount to a large-scale adjustment of the troposphere to potential vorticity (PV) anomalies in the stratosphere. This paper analyses whether a simple PV adjustment suffices to explain the actual dynamical response of the troposphere to the state of the stratosphere, the actual response being determined by ensembles of numerical experiments run with an atmospheric general-circulation model. For this purpose, a new PV inverter is developed. It is shown that the simple PV adjustment hypothesis is inadequate. PV anomalies in the stratosphere induce, by inversion, flow anomalies in the troposphere that do not coincide spatially with the tropospheric changes determined by the numerical experiments. Moreover, the tropospheric anomalies induced by PV inversion are on a larger scale than the changes found in the numerical experiments, which are linked to the Atlantic and Pacific storm-tracks. These findings imply that the impact of the stratospheric state on the troposphere is manifested through the impact on individual synoptic-scale systems and their self-organization in the storm-tracks. Changes in these weather systems in the troposphere are not merely synoptic-scale noise on a larger scale tropospheric response, but an integral part of the mechanism by which the state of the stratosphere impacts that of the troposphere.

Purpose built teaching equipment for a laboratory based course in three phase machines and drives

The hazards associated with high voltage three phase inverters and the rotating shafts of large electrical machines have resulted in most of the engineering courses covering these topics to be predominantly theoretical. This paper describes a set of purpose built, low voltage and low cost teaching equipment which allows the "hands on" instruction of three phase inverters and rotating machines. By using low voltages, the student can experiment freely with the motors and inverter and can access all of the current and voltage waveforms, which until now could only be studied in text books or observed as part of laboratory demonstrations. Both the motor and the inverter designs are optimized for teaching purposes cost around $25 and can be made with minimal effort.

Three-phase machines and drives - equipment for a laboratory-based course

The hazards associated with high-voltage three-phase inverters and high-powered large electrical machines have resulted in most of the engineering courses covering three-phase machines and drives theoretically. This paper describes a set of purpose-built, low-voltage, and low-cost teaching equipment that allows the hands-on instruction of three-phase inverters and rotating machines. The motivation for moving towards a system running at low voltages is that the students can safely experiment freely with the motors and inverter. The students can also access all of the current and voltage waveforms, which until now could only be studied in textbooks or observed as part of laboratory demonstrations. Both the motor and the inverter designs are for teaching purposes and require minimal effort and cost

Study of the variation of the input impedance of induction machines with frequency

The results of a study of the variation of three-phase induction machines' input impedance with frequency are proposed. A range of motors were analysed, both two-pole and four-pole, and the magnitude and phase of the input impedance were obtained over a wide frequency range of 20 Hz-1 MHz. For test results that would be useful in the prediction of the performance of induction machines during typical use, a test procedure was developed to represent closely typical three-phase stator coil connections when the induction machine is driven by a three-phase inverter. In addition, tests were performed with the motor's cases both grounded and not grounded. The results of the study show that all induction machines of the type considered exhibit a multiresonant impedance profile, where the input impedance reaches at least one maximum as the input frequency is increased. Furthermore, the test results show that the grounding of the motor's case has a significant effect on the impedance profile. Methods to exploit the input impedance profile of an induction machine to optimise machine and inverter systems are also discussed.

The effects of different knowledge-dissemination interventions on the mastitis knowledge of Tanzanian smallholder dairy farmers

We developed three different knowledge-dissemination methods for educating Tanzanian smallholder farmers about mastitis in their dairy cattle. The effectiveness of these methods (and their combinations) was evaluated and quantified using a randomised controlled trial and multilevel statistical modelling. To our knowledge, this is the first study that has used such techniques to evaluate the effectiveness of different knowledge-dissemination interventions for adult learning in developing countries. Five different combinations of knowledge-dissemination method were compared: 'diagrammatic handout' ('HO'), 'village meeting' ('VM'), 'village meeting and video' ('VM + V), 'village meeting and diagrammatic handout' ('VM + HO') and 'village meeting, video and diagrammatic handout' ('VM + V + HO'). Smallholder dairy farmers were exposed to only one of these interventions, and the effectiveness of each was compared to a control ('C') group, who received no intervention. The mastitis knowledge of each farmer (n = 256) was evaluated by questionnaire both pre- and post-dissemination. Generalised linear mixed models were used to evaluate the effectiveness of the different interventions. The outcome variable considered was the probability of volunteering correct responses to mastitis questions post-dissemination, with 'village' and 'farmer' considered as random effects in the model. Results showed that all five interventions, 'HO' (odds ratio (OR) = 3.50, 95% confidence intervals (CI) = 3.10, 3.96), 'VM + V + HO' (OR = 3.34, 95% CI = 2.94, 3.78), 'VM + HO, (OR=3.28, 95% CI=2.90, 3.71), WM+V (OR=3.22, 95% CI=2.84, 3.64) and 'VM' (OR = 2.61, 95% CI = 2.31, 2.95), were significantly (p < 0.0001) more effective at disseminating mastitis knowledge than no intervention. In addition, the 'VM' method was less effective at disseminating mastitis knowledge than other interventions. Combinations of methods showed no advantage over the diagrammatic handout alone. Other explanatory variables with significant positive associations on mastitis knowledge included education to secondary school level or higher, and having previously learned about mastitis by reading pamphlets or attendance at an animal-health course. (c) 2005 Elsevier B.V. All rights reserved.

Testing white line strength in the dairy cow

The tensile strength of 576 pieces of white line horn collected over 6 mo from 14 dairy cows restricted to parity 1 or 2 was tested. None of the cows had ever been lame. Seven cows were randomly assigned to receive 20 mg/d biotin supplementation, and 7 were not supplemented. Hoof horn samples were taken from zones 2 and 3 (the more proximal and distal sites of the abaxial white line) of the medial and lateral claws of both hind feet on d 1 and on 5 further occasions over 6 mo. The samples were analyzed at 100% water saturation. Hoof slivers were notched to ensure that tensile strength was measured specifically across the white line region. The tensile stress at failure was measured in MPa and was adjusted for the cross-sectional area of the notch site. Data were analyzed in a multilevel model, which accounted for the repeated measures within cows. All other variables were entered as fixed effects. In the final model, there was considerable variation in strength over time. Tensile strength was significantly higher in medial compared with lateral claws, and zone 2 was significantly stronger than zone 3. Where the white line was visibly damaged the tensile strength was low. Biotin supplementation did not affect the tensile strength of the white line. Results of this study indicate that damage to the white line impairs its tensile strength and that in horn with no visible abnormality the white line is weaker in the lateral hind claw than the medial and in zone 3 compared with zone 2. The biomechanical strength was lowest at zone 3 of the lateral hind claw, which is the most common site of white line disease lameness in cattle.

Purpose built teaching equipment for a laboratory based course in three phase machines and drives

The hazards associated with high voltage three phase inverters ond the rotating sha@s of large electrical machines have resulted in most of the engineering courses covering these topics to be predominantly theoretical. This paper describes a set of purpose built, low voltage and low cost teaching equipment which allows the “hands on I’ instruction of three phase inverters and rotating machines. By using low voltages, the student can experiment freely with the motors and inverter and can access all of the current and voltage waveforms, which until now could only be studied in text books or observed as part of laboratory demonstrations. Both the motor and the inverter designs are optimized for teaching purposes, cost around $25 and can be made with minimal effort.

Three-phase machines and drives - Equipment for a laboratory-based course

The hazards associated with high-voltage three-phase inverters and high-powered large electrical machines have resulted in most of the engineering courses covering three-phase machines and drives theoretically. This paper describes a set of purpose-built, low-voltage, and low-cost teaching equipment that allows the hands-on instruction of three-phase inverters and rotating machines. The motivation for moving towards a system running at low voltages is that the students can safely experiment freely with the motors and inverter. The students can also access all of the current and voltage waveforms, which until now could only be studied in textbooks or observed as part of laboratory demonstrations. Both the motor and the inverter designs are for teaching purposes and require minimal effort and cost.