System identification of linear vibrating structures

Methods of dynamic modelling and analysis of structures, for example the finite element method, are well developed. However, it is generally agreed that accurate modelling of complex structures is difficult and for critical applications it is necessary to validate or update the theoretical models using data measured from actual structures. The techniques of identifying the parameters of linear dynamic models using Vibration test data have attracted considerable interest recently. However, no method has received a general acceptance due to a number of difficulties. These difficulties are mainly due to (i) Incomplete number of Vibration modes that can be excited and measured, (ii) Incomplete number of coordinates that can be measured, (iii) Inaccuracy in the experimental data (iv) Inaccuracy in the model structure. This thesis reports on a new approach to update the parameters of a finite element model as well as a lumped parameter model with a diagonal mass matrix. The structure and its theoretical model are equally perturbed by adding mass or stiffness and the incomplete number of eigen-data is measured. The parameters are then identified by an iterative updating of the initial estimates, by sensitivity analysis, using eigenvalues or both eigenvalues and eigenvectors of the structure before and after perturbation. It is shown that with a suitable choice of the perturbing coordinates exact parameters can be identified if the data and the model structure are exact. The theoretical basis of the technique is presented. To cope with measurement errors and possible inaccuracies in the model structure, a well known Bayesian approach is used to minimize the least squares difference between the updated and the initial parameters. The eigen-data of the structure with added mass or stiffness is also determined using the frequency response data of the unmodified structure by a structural modification technique. Thus, mass or stiffness do not have to be added physically. The mass-stiffness addition technique is demonstrated by simulation examples and Laboratory experiments on beams and an H-frame.

A high efficient biometrics approach for unconstrained iris segmentation and recognition

This dissertation develops an innovative approach towards less-constrained iris biometrics. Two major contributions are made in this research endeavor: (1) Designed an award-winning segmentation algorithm in the less-constrained environment where image acquisition is made of subjects on the move and taken under visible lighting conditions, and (2) Developed a pioneering iris biometrics method coupling segmentation and recognition of the iris based on video of moving persons under different acquisitions scenarios. The first part of the dissertation introduces a robust and fast segmentation approach using still images contained in the UBIRIS (version 2) noisy iris database. The results show accuracy estimated at 98% when using 500 randomly selected images from the UBIRIS.v2 partial database, and estimated at 97% in a Noisy Iris Challenge Evaluation (NICE.I) in an international competition that involved 97 participants worldwide involving 35 countries, ranking this research group in sixth position. This accuracy is achieved with a processing speed nearing real time. The second part of this dissertation presents an innovative segmentation and recognition approach using video-based iris images. Following the segmentation stage which delineates the iris region through a novel segmentation strategy, some pioneering experiments on the recognition stage of the less-constrained video iris biometrics have been accomplished. In the video-based and less-constrained iris recognition, the test or subject iris videos/images and the enrolled iris images are acquired with different acquisition systems. In the matching step, the verification/identification result was accomplished by comparing the similarity distance of encoded signature from test images with each of the signature dataset from the enrolled iris images. With the improvements gained, the results proved to be highly accurate under the unconstrained environment which is more challenging. This has led to a false acceptance rate (FAR) of 0% and a false rejection rate (FRR) of 17.64% for 85 tested users with 305 test images from the video, which shows great promise and high practical implications for iris biometrics research and system design.

The Relationship Between Online and In Person GED Preparatory Courses

Courses are taken in order to prepare for the General Educational Development Test. These courses are offered traditionally and virtually. The actual test must be taken in-person regardless of whether an individual took preparatory courses virtually or traditionally. This paper will explore the benefits and obstacles that each method of delivering instruction has.

Formação docente e conhecimento profissional: desafios para o ensino da matemática na EJA

As for the Education for Youth and Adult (EYA), the challenge of training these teachers is to provide tools to understand and act on the teaching of mathematics. It is realized just how special education in this modality and as such teaching is lacking in an adequate and solid training in the area of knowledge. One of the major problems affecting this type of education is the high dropout and failure rates, and lack of motivation among students. Thus the need to provide differentiated profile with a professional to teach youth and adults students, so that they are able to mobilize didactic-pedagogic knowledge, methodologies and theoretical frameworks that serve as a basis for school-developed teaching practice. This thesis aims to investigate how the math teacher, who acts in adult education from elementary school, has developed its didactic and pedagogical action, and that professional knowledge has been mobilized to teach? It has highlighted the importance of initial and continuing training and professionalization of teachers dedicated to this specific type of education, when teachers should be the protagonists of their professional development. The methodological approach was begun with a literature review, then the research was anchored mainly on the ideas by Gauthier, Nuñez and Ramalho (2004); Imbernon (2011), Garcia (2006); Perrenoud (2000); Tardif (2007 ); Haddad, Di Pierro (2000), D'Ambrosio (2002), Mendes (2006, 2009), Freire (1996, 2011), and other theorists and official documents of field of adult education here and abroad. That work leads us to the understanding of the present moment from a foray into historical and conceptual aspects, as well as educational policies of EYA, as well as training, professionalism, knowledge and skills necessary for professional practice. Then, the subjects and the locus of research and the instrument for data collection were set up and led by the object of study. To consolidate the study was selected a sample of 27 mathematics teachers, working in municipal EYA Network Teaching of Natal. This research is in an investigative nature, within the quantitative and qualitative approaches focused on the responses of study subjects from the content analysis by Bardin (1977). Results from the analyzes have revealed that the initial training of mathematics teachers of adult education needs to be reconfigured in order to formalize the knowledge base of professionals (the mathematical content, didactics and professional knowledge). Thus the study suggests that this base knowledge is embedded in the pedagogical practice of these teachers, so that there is a completion of the teaching and learning process for young people and adults. The study also has pointed out that there is a need for teachers to participate in a continuing education plan that prioritizes learning situations of mathematical content considering the previous knowledge of the students. The final analyses thus indicate that knowledge of mathematics and the didactic and pedagogical strategies to be mobilized by teachers must be able to motivate the students in such a way that they feel need to incorporate in their knowledge, mathematical knowledge capable of making them more likely to have access to social, economic and labor market

Integração ensino e serviço: dizer e fazer saúde na atenção básica

The current discussion on Education and Health has shown the need for greater integration between health services and academia, and this issue has been addressed by researchers in the area as being of great importance. How do we say what we need to do? The National Policy on Education Permanent Health proposes the dissemination of pedagogical skills at SUS, so that the public health clearance to constitute an area of teaching and learning in work performance. This study aimed to know how is the process of integration between education and health services in primary health care, from the knowledge on the role of mentors in the training of undergraduate students in the healthcare field in UFRN. Qualitative Methodology possible, from the use of the techniques of Semi-Structured Interview and Direct Observation of achieving this goal. The analysis of data taken from the Hermeneutic-Dialectic Approach, taking as mediators knowledge of the areas of Education, Health Education and Public Health, showed that the performance of preceptors constitutes an important strategy to enable the integration of teaching and service, and the professionals involved in the preceptorship educate themselves while they educate. The educational process is permeated by knowledge and experiences heterogeneous, highly favorable to the training of students and professionals factor. Innovative educational practices proven capable of starting the mediation of preceptors and other professionals involved in the Work Programme Education for Health, extend learning. The curriculum components Integrated Activity of Health, Education and Citizenship, and Tutorial Program for Integrated Health Work chosen as the basis for this experiment set, for preceptors, the need to seek new knowledge, allowing each actor transcend its specific area of academic training and interact with other areas, which makes learning interesting, enjoyable and meaningful.

A Study of the Behavioural and Affective Profile of Inpatient Adolescent Girls Presenting a Restrictive Anorexia Nervosa

Essai doctoral d'intégration présenté à la Faculté des Études Supérieures et Postdoctorales en vue de l'obtention du grade de Docteur en psychologie (D.Psy.), en psychologie clinique

A Study of the Behavioural and Affective Profile of Inpatient Adolescent Girls Presenting a Restrictive Anorexia Nervosa

Essai doctoral d'intégration présenté à la Faculté des Études Supérieures et Postdoctorales en vue de l'obtention du grade de Docteur en psychologie (D.Psy.), en psychologie clinique

Crisis, educación y precariedad-afluencia. El rol de la educación en las condiciones de vida de la población española

El objeto de este artículo es estudiar la influencia del nivel educativo (capital cultural) en los procesos de precariedad-afluencia de la población española entre los años posteriores a la crisis de inicio de la década de 1990 y los años más duros de la crisis de 2007. A partir de los datos de las encuestas PHOGUE y ECV del Instituto Nacional de Estadística (INE) se han construido cuatro indicadores para medir la precariedad laboral, de ingresos, de salud y de vivienda y su distribución según distintas variables demográficas. Se pretende contrastar la hipótesis de que más educación significa más protección frente a la precariedad, estudiando diferentes condiciones de las condiciones de vida y existencia en momentos tanto de crecimiento como de crisis económica. Mediante un análisis multivariable se intenta determinar el nivel de impacto del capital cultural, alcance, evolución y, sobre todo, si sus efectos positivos o negativos están en proceso de expansión o desaceleración. El resultado tiene una doble aportación: de un lado, metodológica, consistente en la construcción de los indicadores; de otro lado, los resultados, con los que se puede reevaluar algunas generalizaciones sobre la pérdida de importancia del rol de la educación en las sociedades contemporáneas.

När kallet ställs på sin spets : Pensionering ur ett existenssociologiskt perspektiv

When the calling is brought to a head: Retirement from an existential sociology perspective In this article we analyze how the meaning and value of work can emerge, be defined and redefined in relation to the coming of retirement, by focusing individuals with dedicated work approaches interpreted as a calling. By relying on an existential sociology framework we analyze the retirement process as an existential imperative, e.g. life phases or processes where questions on meaning and life quality become prominent. For the interviewees, the day of retirement becomes a sort of a road sign that – depending on the distance of time to the point of retirement – has intensified existential questions and the meaning of work. The article explores the defining dimensions of a calling as found in the interviewees dedicated work approaches. We address the types of problems and opportunities that arise when the interviewees are soon to retire and their associated strategies: listening to a calling on ”standby”; learning not to listen to one’s calling, listening to a calling from a private sphere and project the calling’s commitment to other activities.

As Características das Redes Sociais Pessoais de Idosos Segundo o Estado Civil

Objetivos: O presente estudo tem como principal objetivo caraterizar as redes sociais pessoais dos idosos com idade igual ou superior a 65 anos, relativamente às caraterísticas estruturais, funcionais e relacionais-contextuais, analisando-as segundo o estado civil. Metodologia: Para avaliar as variáveis em estudo foram utilizados: o instrumento de Análise da Rede Social Pessoal, versão para idosos (IARSP – Idosos) (Guadalupe, 2010; Guadalupe & Vicente, 2012) com o objetivo de avaliar as dimensões da rede social pessoal dos idosos e um inquérito por questionário para caracterização sociodemográfica. Participantes: A amostra é constituída por 446 idosos com idades compreendidas entre os 65 anos e os 98 anos (M = 76,09; DP = 7,59). Os participantes são na sua maioria do sexo feminino (n = 285, 63,9%). A maioria dos idosos é casada/união de facto (n = 230, 51,6%) e em minoria encontram-se os divorciados/separados (n = 21, 4,7%) e têm filhos (n=389, 87,2%). Resultados: Os resultados demonstram que o estado civil apresenta associações estatisticamente significativas com as variáveis sociodemográficas sexo, idade, viver só, parentalidade e escolaridade. Registam-se diferenças significativas relativamente ao estado civil no que diz respeito à maioria das características estruturais da rede, quanto às características funcionais, nomeadamente o acesso a novos vínculos, a reciprocidade de apoio, a satisfação com a rede e com o suporte social, e quanto às características relacionais-contextuais apenas se assinalam relativamente à distância de residência. Conclusões: O nosso estudo revela que as redes sociais pessoais dos idosos se diferenciam a nível estrutural e funcional segundo o estado civil destes idosos. Os idosos casados apresentam redes maiores mais centradas nas relações familiares na rede do que os idosos com outros estados civis. Os idosos solteiros são os que apresentam redes menores, mais investidas nas relações de amizade e de vizinhança e menos nas relações familiares comparativamente com os outros tipos de relacionamento. / Objectives: This study aims to characterize the personal social networks of the elderly aged 65 years or more, for structural, functional and relational-contextual features, analyzing them according to marital status. Methodology: To assess the variables studied the following was used: the analysis tool of the Personal Social Network, version for elderly (IARSP - Elderly) (Guadalupe, 2010; Guadalupe & Vicente, 2012) in order to assess the dimensions of the personal social network of the elderly and a questionnaire for socio-demographic characterization. Participants: The sample comprises 446 elderly, aged between 65 years and 98 years (M = 76.09, SD = 7.59). Participants are mostly female (n = 285, 63.9%). Most seniors are married / consensual union (n = 230, 51.6%) and a minority is divorced / separated (n = 21, 4.7%) and have children (n = 389, 87. 2%). Results: The results show that marital status has statistically significant associations with the sociodemographic variables, gender, age, living alone, and parenting and education. There are significant differences with regard to marital status relating to most of the structural characteristics of the network, for the functional features, namely access to new links, reciprocal support, satisfaction with the network and social support, and as to the relational-contextual characteristics these only appear in relation to the distance of residence. Conclusions: Our study shows that personal social networks of the elderly are different on a structural and functional level according to the marital status of these seniors. Married elderly have larger networks more centered on family relationships on the network than the elderly with other marital statuses. The single elderly are those with smaller networks, more invested in the relations of friendship and neighborhood and less on family relationships compared to other types of relationship.

A história da ciência como subsídio para a construção do conhecimento do conceito da dupla hélice

Acompanha: Dupla-hélice: a construção de um conhecimento

Die Anwendung des 3-2-1 Modells didaktischer Elemente in der Hochschulpraxis

Im Verlauf einer universitätsweiten Förderinitiative wurde für die Lehrveranstaltung Betonbau ein Projekt durchgeführt, das mithilfe Neuer Medien versucht, die Lehre an der Hochschule nachhaltig zu verbessern. In dieser Veröffentlichung wird über die Entwicklung von interaktiven Lernobjekten (ILO) berichtet, die streng nach den Gesichtspunkten des 3-2-1 Modells didaktischer Elemente nach Kerres (2001) aufgebaut wurden. Die Umsetzung, sowohl in technischer als auch didaktischer Hinsicht, sowie die Implementierung im Curriculum wird detailliert beschrieben. Eine Diskussion über eine mögliche Effizienzsteigerung in der Lehre rundet diese Veröffentlichung ab.(DIPF/Orig.)

Modelo gerador de questões no reforço da aprendizagem das radiações e conteúdos de física moderna no ensino secundário

Os avanços e a disseminação do uso das Tecnologias de Informação e Comunicação (TIC) descortinam novas perspetivas para a educação com suporte em ambientes digitais de aprendizagem usados via internet (Fiolhais & Trindade, 2003). A plataforma usada no Projeto Matemática Ensino (PmatE) da Universidade de Aveiro (UA) é uma das ferramentas informáticas que suporta esses ambientes através da avaliação baseada no Modelo Gerador de Questões (MGQ), possibilitando a obtenção da imagem do progresso feito pelos alunos (Vieira, Carvalho & Oliveira, 2004). Reconhecendo a importância didática desta ferramenta, já demonstrada noutras investigações (por exemplo, Carvalho, 2011; Pais de Aquino, 2013; Peixoto, 2009), o presente estudo tem como objetivo geral desenvolver material didático digital de Física, no contexto do programa moçambicano de Física da 12ª classe, para alunos e professores sobre radiações e conteúdos da Física Moderna. Pretendeu-se, ainda, propor estratégias de trabalho com recurso às TIC para a melhoria da qualidade das aprendizagens nesta disciplina. O estudo assentou nas três seguintes questões de investigação: (a) Como conceber instrumentos de avaliação das aprendizagens baseadas no modelo gerador de questões para o estudo das radiações e conteúdos da Física Moderna, no contexto do programa moçambicano de Física da 12ª classe? (b) Que potencialidades e constrangimentos apresentam esses instrumentos quando implementados com alunos e professores? (c) De que forma o conhecimento construído pode ser mobilizado para outros temas da Física e para o ensino das ciências em geral? O estudo seguiu uma metodologia de Estudos de Desenvolvimento, de natureza mista, que compreendeu as fases da Análise, Design, Desenvolvimento e Avaliação, seguindo como paradigma um estudo de cariz exploratório, com uma vertente de estudo de caso. Assim, na Análise, foi discutido o contexto da educação em Moçambique e a problemática da abordagem das radiações e conteúdos de Física Moderna no ensino secundário no quadro desafiante que se coloca atualmente à educação científica. No Design foram avaliadas as abordagens dasTIC no ensino e aprendizagem da Física e das ciências em geral e construída a árvore de objetivos nos conteúdos referidos na fase anterior. Na fase do Desenvolvimento foram construídos os instrumentos de recolha de dados, elaborados os protótipos de MGQ e sua posterior programação, validação e testagem em formato impresso no estudo exploratório. Na Avaliação, foi conduzido o estudo principal com a aplicação dos modelos no formato digital e feita sua avaliação, o que incluiu a administração de inquéritos por questionário a alunos e professores. Os resultados indicam que na conceção de MGQ, a definição dos objetivos de aprendizagem em termos comportamentais é fundamental na formulação de questões e na análise dos resultados da avaliação com o objetivo de reajustar as estratégias didáticas. Apontam também que a plataforma do PmatE que suporta os MGQ, embora possua constrangimentos devido a sua dependência da internet e limitações de ordem didática, contribui positivamente na aprendizagem e na identificação das dificuldades e principais erros dos alunos, por um lado. Por outro, estimula através da avaliação os processos de assimilação e acomodação do conhecimento. O estudo recomenda a necessidade de mudanças nas práticas de ensino e de aprendizagem para que seja possível a utilização de conteúdos digitais como complemento à abordagem didática de conteúdos.

Educar, pesquisar e entusiasmar: em busca de soluções personalizadas

Relatório de Estágio apresentado à Escola Superior de Educação de Paula Frassinetti para obtenção do grau de Mestre em Educação Pré-Escolar e Ensino do 1º Ciclo do Ensino Básico

A promoção da aprendizagem ativa em contextos educativos

Relatório de Estágio apresentado à Escola Superior de Educação de Paula Frassinetti para obtenção do grau de Mestre em Educação Pré-Escolar e Ensino do 1º Ciclo do Ensino Básico