MIGUEL LOPES - Academia.edu (original) (raw)
Papers by MIGUEL LOPES
2022 IEEE 49th Photovoltaics Specialists Conference (PVSC)
Dissertação apresentada para cumprimento dos requisitos necessários à obtenção do grau de Mestre ... more Dissertação apresentada para cumprimento dos requisitos necessários à obtenção do grau de Mestre em Engenharia de ProduçãoOs revestimentos compósitos Al-12Si/NbC foram produzidos por deposição assistida por laser em um substrato de liga Al-7Si. A microestrutura e a resistência ao desgaste dos revestimentos foram avaliadas em comparação com as propriedades do substrato e da liga da matriz. A resistência ao desgaste foi avaliada usando testes de deslizamento reciproco de configuração esfera sobre o plano, em que foram usados como contra-corpos esferas do aço crómio AISI 52100, aço inox 316L, carboneto de tungsténio (WC) e óxido de alumínio (Al2O3). A microestrutura dos revestimentos é constituída por partículas de NbC dispersas numa matriz de liga Al-12Si. A matriz é constituída por dendrites primárias de α-Al e mistura eutéctica α-Al/Si. O reforço com partículas de NbC induz um aumento considerável na dureza média do material da matriz de (85 ± 1) HV a (152 ± 40) HV e na respetiva re...
O ensino da estatística nas licenciaturas do Instituto Politécnico de Santarém.info:eu-repo/seman... more O ensino da estatística nas licenciaturas do Instituto Politécnico de Santarém.info:eu-repo/semantics/publishedVersio
À medida que a população mundial envelhece, a temática da Preparação para a Reforma (PR) se torna... more À medida que a população mundial envelhece, a temática da Preparação para a Reforma (PR) se torna mais emergente. A reforma representa uma mudança significativa na vida de um ser humano e a transição para esta fase pode vir acompanhada de medos, anseios e até depressão. Portugal possui uma das populações mais envelhecidas do mundo e as organizações não podem ser indiferentes a esta realidade. Os Recursos Humanos precisam estar atentos aos seus colaboradores para ajudá-los a se prepararem para a vida na reforma, seja esta preenchida ou não por atividades laborais. No âmbito do doutoramento em Políticas de Desenvolvimento de Recursos Humanos da Universidade de Lisboa, o objetivo deste trabalho consiste na análise de conteúdo de oito entrevistas feitas a Diretores de grandes organizações presentes em Portugal sobre a temática da PR. As oito organizações participantes representam diversos setores da economia e foram selecionadas pelo método da bola de neve. As entrevistas ocorreram de f...
Social Sciences, 2021
The present study analyzed whether one’s work orientation can be organized into work orientation ... more The present study analyzed whether one’s work orientation can be organized into work orientation profiles beyond the three pure orientations of job, career, and calling. We tested the existence of these hybrid work orientations in a sample of 959 adults aged from 18 to 71 years old (M = 40.61, SD = 9.54). A cluster analysis showed that the best result consisted of four profiles: “Career-Calling”, “Career-Job”, “Pure Job”, and “Indifference”. Theoretical and practical implications of profile approach to the study of work orientations are discussed at the end.
Advances in Science, Technology & Innovation, 2020
ApprenticeshipQ, 2020
The project “Mainstreaming Procedures for Quality Apprenticeships in Educational Organisations an... more The project “Mainstreaming Procedures for Quality Apprenticeships in Educational Organisations and Enterprises” (ApprenticeshipQ) will support educational institutions and placement providers to offer high-quality education to their apprentices. We consider educational institutions here as Higher Vocational Education and Training Institutions, and Professional Higher Education Institutions as Universities of Applied Sciences and Colleges, as well as Academic/ Research-oriented Universities). The project’s proposed assessment of quality will make these processes more manageable and will benefit all stakeholders. These benefits include lifelong learning for teachers, professors and tutors, enhancements for placement providers, improvement of apprentice’s skills development and overall higher quality of the learning experience. The activities of ApprenticeshipQ will strengthen the cooperation and networking between educational institutions and their training partners’ site (placement providers), by providing them with innovative practices to enhance or establish quality management documented information that was developed and tested during the project. The aim is to develop management tools that support educational institutions and placement providers to offer and direct high-quality apprenticeships. These management tools shall be recognised as a model to improve the quality of the apprenticeships and will serve as a basis for the development of formal international standards and guidelines. This guide is structured as follows: The guide starts by giving an introduction to the ApprenticeshipQ project, containing definitions of the research, which led to this guide. Guidance on how to use this guide follows. This section provides a more detailed description of the present document and its objectives. The quality criteria developed in the project are listed with the corresponding measurement indicators in chapter 5. Each criterion is supplemented by a short description and an example. The examples are taken from their own project qualitative interview survey with numerous placement providers. Also, a link to documented information is provided for each quality criteria. How these criteria can be implemented is explained in Chapter 6 using a PDCA (PlanDo-Check-Act-Cycle) model
British Journal of Surgery, 2021
Demonstrate the performance and safety of TISSIUM on-demand activated adhesive for atraumatic her... more Demonstrate the performance and safety of TISSIUM on-demand activated adhesive for atraumatic hernia mesh fixation in a laparoscopic IPOM porcine model. Full thickness 4 cm in diameter excisional abdominal defects (n = 14) were created in pig (n = 8). The defects were repaired through laparoscopic intraperitoneal mesh placement using commercial composite meshes fixed with TISSIUM adhesive (n = 8) or resorbable tacks (n = 6). The animals were sacrificed after 28 and 90 days. An independent pathologist evaluated abdominal adhesion, mesh shrinkage, local tissue tolerance and tissue ingrowth through histological analysis (H&E and Movat Pentacrome) at sacrifice. Fixation strength of the explanted abdominal walls was also assessed via burst-ball. No adverse events were observed at implantation or during the survival period. All the meshes were in place at sacrifice. Mesh shrinkage and abdominal adhesion scores were similar between the two groups. Histological analysis of the mesh demonstr...
British Journal of Surgery, 2021
Demonstrate the performance and safety of TISSIUM on-demand activated adhesive for atraumatic her... more Demonstrate the performance and safety of TISSIUM on-demand activated adhesive for atraumatic hernia mesh fixation in a laparoscopic IPOM porcine model. Full thickness 4 cm in diameter excisional abdominal defects (n = 14) were created in pig (n = 8). The defects were repaired through laparoscopic intraperitoneal mesh placement using commercial composite meshes fixed with TISSIUM adhesive (n = 8) or resorbable tacks (n = 6). The animals were sacrificed after 28 and 90 days. An independent pathologist evaluated abdominal adhesion, mesh shrinkage, local tissue tolerance and tissue ingrowth through histological analysis (H&E and Movat Pentacrome) at sacrifice. Fixation strength of the explanted abdominal walls was also assessed via burst-ball. No adverse events were observed at implantation or during the survival period. All the meshes were in place at sacrifice. Mesh shrinkage and abdominal adhesion scores were similar between the two groups. Histological analysis of the mesh demonstr...
Transport in Human Scale Cities, 2021
The (re)turn to human scale cities is inseparable from the shift of mobility paradigms towards su... more The (re)turn to human scale cities is inseparable from the shift of mobility paradigms towards sustainable modes of transport. As car dominance steadily transformed what was once public space into road space (Sheller and Urry, 2003), growing congestion and pollution have decreased the quality of life and equity among citizens. Non-motorized transport, and especially cycling, is associated with higher levels of happiness and emotional wellbeing (Zhu and Fan, 2018). It has been framed as a means to democratize the city (Cox, 2019) and as a convivial tool that increases opportunities for social relationships (Illich, 1973, 1974), in addition to other widely recognized environmental and economic benefits. Cycling, therefore, establishes and ensures mobility on a human scale (Quee and Bijlsma, 2018). Nevertheless, despite the growing policy and academic interest in cycling, when compared with other modes of transport little attention has been paid to it (Heinen et al., 2010), and analysis and planning methods have not kept pace with demand (Kuzmyak et al., 2014). Promoting a modal shift towards cycling is a complex process, particularly in cities dominated by the car-centric paradigm, which cannot reproduce the path of champion cycling cities such as Amsterdam and Copenhagen. Starter cycling cities combine poor cycling conditions with low cycling rates (Dufour, 2010), where the lack of cycling culture and technical know-how limits strategies to sporadic interventions (such as hastily planned infrastructure or symbolic bike sharing systems). Long-term commitment is also weakened as cycling provision lacks the high profile of other infrastructure investments (such as, for example, the metro) and is associated with being 'cheap' (Aldred, 2013).
Compreender a relação entre a Educação Física e o rendimento académico é importante para o desenv... more Compreender a relação entre a Educação Física e o rendimento académico é importante para o desenvolvimento de políticas educativas mais fundamentadas com o objectivo de melhorar o desempenho académico dos estudantes. Objectivo: O objectivo desta revisão foi fazer uma síntese dos estudos que abordam a relação entre a Educação Física e o rendimento académico dos jovens. Método: Os estudos foram identificados através de uma pesquisa em 8 bases de dados (EBSCO, Web of Science, Dialnet, Health Refere...
Additional file 4 Supplementary Fig. 4. BACH1 knockdown stimulates insulin secretion. BACH1 mRNA ... more Additional file 4 Supplementary Fig. 4. BACH1 knockdown stimulates insulin secretion. BACH1 mRNA expression assayed by qPCR in INS-1E cells (A) and human islets (B) exposed to palmitate for 24 h. (C-D) Human islet cells were transfected with BACH1 siRNA or control siRNA (siCT) and treated with palmitate for 24 h. (C) BACH1 mRNA expression measured by qPCR. (D) Apoptosis evaluated by DNA-binding dyes. (E-I) INS-1E cells were transfected with control siRNA or two different Bach1 siRNAs. mRNA expression measured by qPCR of Bach1 (E) and heme oxygenase 1 (Hmox1) (F), a transcriptional target of Bach1. Insulin content (G) and insulin secretion after incubation with 1.7 mM and 16.7 mM glucose (H) or 1.7 mM glucose and 1.7 mM glucose plus 30 mM KCl (I). Insulin secretion and content were measured by ELISA and corrected by total protein content. Data are from 4 to 7 independent experiments. *p
Proceedings of the SMC Conferences, Jul 21, 2010
The Bag-of-Frames (BoF) approach has been widely used in music genre classification. In this appr... more The Bag-of-Frames (BoF) approach has been widely used in music genre classification. In this approach, music genres are represented by statistical models of low-level features computed on short frames (e.g. in the tenth of ms) of audio signal. In the design of such models, a common procedure in BoF approaches is to represent each music genre by sets of instances (i.e. frame-based feature vectors) inferred from training data. The common underlying assumption is that the majority of such instances do capture somehow the (musical) specificities of each genre, and that obtaining good classification performance is a matter of size of the training dataset, and fine-tuning feature extraction and learning algorithm parameters. We report on extensive tests on two music databases that contradict this assumption. We show that there is little or no benefit in seeking a thorough representation of the feature vectors for each class. In particular, we show that genre classification performances are similar when representing music pieces from a number of different genres with the same set of symbols derived from a single genre or from all the genres. We conclude that our experiments provide additional evidence to the hypothesis that common low-level features of isolated audio frames are not representative of music genres.
Case Studies on Transport Policy, 2022
Esta tese tem como objetivo procurar respostas para a seguinte pergunta de partida: Na perceção d... more Esta tese tem como objetivo procurar respostas para a seguinte pergunta de partida: Na perceção dos profissionais, qual é a relação que existe entre a liderança autêntica e os comportamentos positivos nas escolas públicas portuguesas? Nesse sentido, usamos estudos empíricos, dois quantitativos e um qualitativo, para testar essa relação com os comportamentos declarados, chamamento e envolvimento no trabalho, por professores e, confiança, pelos diretores das escolas. Concluímos que todos os elementos essenciais de uma organização autentizótica contribuem para explicar o que as pessoas esperam potencialmente das suas organizações: condições materiais adequadas e uma contribuição com sentido. Não confirmámos a relação entre a liderança autêntica (LA) e os comportamentos positivos. Isso promoveu mesmo a possibilidade da influência da LA não ser sentida pelos seguidores. No entanto, verificou-se uma relação positiva e significativa entre o chamamento e o envolvimento no trabalho. O chamamento moderou ainda, com um resultado positivo e significativo, a relação entre a LA e o envolvimento no trabalho. Concluímos finalmente que a autoconfiança é uma característica comum dos diretores e que a compassividade e a assertividade devem combinar-se para alcançar a liderança autêntica baseada na confiança inteligente, o que é descrito num modelo matricial construído a partir dos dados.
is expressed in retina endothelial cells at artery
The Bag-of-Frames (BoF) approach has been widely used in music genre classification. In this appr... more The Bag-of-Frames (BoF) approach has been widely used in music genre classification. In this approach, music genres are represented by statistical models of low-level features computed on short frames (e.g. in the tenth of ms) of audio signal. In the design of such models, a common procedure in BoF approaches is to represent each music genre by sets of instances (i.e. frame-based feature vectors) inferred from training data. The common underlying assumption is that the majority of such instances do capture somehow the (musical) specificities of each genre, and that obtaining good classification performance is a matter of size of the training dataset, and fine-tuning feature extraction and learning algorithm parameters. We report on extensive tests on two music databases that contradict this assumption. We show that there is little or no benefit in seeking a thorough representation of the feature vectors for each class. In particular, we show that genre classification performances ar...
2022 IEEE 49th Photovoltaics Specialists Conference (PVSC)
Dissertação apresentada para cumprimento dos requisitos necessários à obtenção do grau de Mestre ... more Dissertação apresentada para cumprimento dos requisitos necessários à obtenção do grau de Mestre em Engenharia de ProduçãoOs revestimentos compósitos Al-12Si/NbC foram produzidos por deposição assistida por laser em um substrato de liga Al-7Si. A microestrutura e a resistência ao desgaste dos revestimentos foram avaliadas em comparação com as propriedades do substrato e da liga da matriz. A resistência ao desgaste foi avaliada usando testes de deslizamento reciproco de configuração esfera sobre o plano, em que foram usados como contra-corpos esferas do aço crómio AISI 52100, aço inox 316L, carboneto de tungsténio (WC) e óxido de alumínio (Al2O3). A microestrutura dos revestimentos é constituída por partículas de NbC dispersas numa matriz de liga Al-12Si. A matriz é constituída por dendrites primárias de α-Al e mistura eutéctica α-Al/Si. O reforço com partículas de NbC induz um aumento considerável na dureza média do material da matriz de (85 ± 1) HV a (152 ± 40) HV e na respetiva re...
O ensino da estatística nas licenciaturas do Instituto Politécnico de Santarém.info:eu-repo/seman... more O ensino da estatística nas licenciaturas do Instituto Politécnico de Santarém.info:eu-repo/semantics/publishedVersio
À medida que a população mundial envelhece, a temática da Preparação para a Reforma (PR) se torna... more À medida que a população mundial envelhece, a temática da Preparação para a Reforma (PR) se torna mais emergente. A reforma representa uma mudança significativa na vida de um ser humano e a transição para esta fase pode vir acompanhada de medos, anseios e até depressão. Portugal possui uma das populações mais envelhecidas do mundo e as organizações não podem ser indiferentes a esta realidade. Os Recursos Humanos precisam estar atentos aos seus colaboradores para ajudá-los a se prepararem para a vida na reforma, seja esta preenchida ou não por atividades laborais. No âmbito do doutoramento em Políticas de Desenvolvimento de Recursos Humanos da Universidade de Lisboa, o objetivo deste trabalho consiste na análise de conteúdo de oito entrevistas feitas a Diretores de grandes organizações presentes em Portugal sobre a temática da PR. As oito organizações participantes representam diversos setores da economia e foram selecionadas pelo método da bola de neve. As entrevistas ocorreram de f...
Social Sciences, 2021
The present study analyzed whether one’s work orientation can be organized into work orientation ... more The present study analyzed whether one’s work orientation can be organized into work orientation profiles beyond the three pure orientations of job, career, and calling. We tested the existence of these hybrid work orientations in a sample of 959 adults aged from 18 to 71 years old (M = 40.61, SD = 9.54). A cluster analysis showed that the best result consisted of four profiles: “Career-Calling”, “Career-Job”, “Pure Job”, and “Indifference”. Theoretical and practical implications of profile approach to the study of work orientations are discussed at the end.
Advances in Science, Technology & Innovation, 2020
ApprenticeshipQ, 2020
The project “Mainstreaming Procedures for Quality Apprenticeships in Educational Organisations an... more The project “Mainstreaming Procedures for Quality Apprenticeships in Educational Organisations and Enterprises” (ApprenticeshipQ) will support educational institutions and placement providers to offer high-quality education to their apprentices. We consider educational institutions here as Higher Vocational Education and Training Institutions, and Professional Higher Education Institutions as Universities of Applied Sciences and Colleges, as well as Academic/ Research-oriented Universities). The project’s proposed assessment of quality will make these processes more manageable and will benefit all stakeholders. These benefits include lifelong learning for teachers, professors and tutors, enhancements for placement providers, improvement of apprentice’s skills development and overall higher quality of the learning experience. The activities of ApprenticeshipQ will strengthen the cooperation and networking between educational institutions and their training partners’ site (placement providers), by providing them with innovative practices to enhance or establish quality management documented information that was developed and tested during the project. The aim is to develop management tools that support educational institutions and placement providers to offer and direct high-quality apprenticeships. These management tools shall be recognised as a model to improve the quality of the apprenticeships and will serve as a basis for the development of formal international standards and guidelines. This guide is structured as follows: The guide starts by giving an introduction to the ApprenticeshipQ project, containing definitions of the research, which led to this guide. Guidance on how to use this guide follows. This section provides a more detailed description of the present document and its objectives. The quality criteria developed in the project are listed with the corresponding measurement indicators in chapter 5. Each criterion is supplemented by a short description and an example. The examples are taken from their own project qualitative interview survey with numerous placement providers. Also, a link to documented information is provided for each quality criteria. How these criteria can be implemented is explained in Chapter 6 using a PDCA (PlanDo-Check-Act-Cycle) model
British Journal of Surgery, 2021
Demonstrate the performance and safety of TISSIUM on-demand activated adhesive for atraumatic her... more Demonstrate the performance and safety of TISSIUM on-demand activated adhesive for atraumatic hernia mesh fixation in a laparoscopic IPOM porcine model. Full thickness 4 cm in diameter excisional abdominal defects (n = 14) were created in pig (n = 8). The defects were repaired through laparoscopic intraperitoneal mesh placement using commercial composite meshes fixed with TISSIUM adhesive (n = 8) or resorbable tacks (n = 6). The animals were sacrificed after 28 and 90 days. An independent pathologist evaluated abdominal adhesion, mesh shrinkage, local tissue tolerance and tissue ingrowth through histological analysis (H&E and Movat Pentacrome) at sacrifice. Fixation strength of the explanted abdominal walls was also assessed via burst-ball. No adverse events were observed at implantation or during the survival period. All the meshes were in place at sacrifice. Mesh shrinkage and abdominal adhesion scores were similar between the two groups. Histological analysis of the mesh demonstr...
British Journal of Surgery, 2021
Demonstrate the performance and safety of TISSIUM on-demand activated adhesive for atraumatic her... more Demonstrate the performance and safety of TISSIUM on-demand activated adhesive for atraumatic hernia mesh fixation in a laparoscopic IPOM porcine model. Full thickness 4 cm in diameter excisional abdominal defects (n = 14) were created in pig (n = 8). The defects were repaired through laparoscopic intraperitoneal mesh placement using commercial composite meshes fixed with TISSIUM adhesive (n = 8) or resorbable tacks (n = 6). The animals were sacrificed after 28 and 90 days. An independent pathologist evaluated abdominal adhesion, mesh shrinkage, local tissue tolerance and tissue ingrowth through histological analysis (H&E and Movat Pentacrome) at sacrifice. Fixation strength of the explanted abdominal walls was also assessed via burst-ball. No adverse events were observed at implantation or during the survival period. All the meshes were in place at sacrifice. Mesh shrinkage and abdominal adhesion scores were similar between the two groups. Histological analysis of the mesh demonstr...
Transport in Human Scale Cities, 2021
The (re)turn to human scale cities is inseparable from the shift of mobility paradigms towards su... more The (re)turn to human scale cities is inseparable from the shift of mobility paradigms towards sustainable modes of transport. As car dominance steadily transformed what was once public space into road space (Sheller and Urry, 2003), growing congestion and pollution have decreased the quality of life and equity among citizens. Non-motorized transport, and especially cycling, is associated with higher levels of happiness and emotional wellbeing (Zhu and Fan, 2018). It has been framed as a means to democratize the city (Cox, 2019) and as a convivial tool that increases opportunities for social relationships (Illich, 1973, 1974), in addition to other widely recognized environmental and economic benefits. Cycling, therefore, establishes and ensures mobility on a human scale (Quee and Bijlsma, 2018). Nevertheless, despite the growing policy and academic interest in cycling, when compared with other modes of transport little attention has been paid to it (Heinen et al., 2010), and analysis and planning methods have not kept pace with demand (Kuzmyak et al., 2014). Promoting a modal shift towards cycling is a complex process, particularly in cities dominated by the car-centric paradigm, which cannot reproduce the path of champion cycling cities such as Amsterdam and Copenhagen. Starter cycling cities combine poor cycling conditions with low cycling rates (Dufour, 2010), where the lack of cycling culture and technical know-how limits strategies to sporadic interventions (such as hastily planned infrastructure or symbolic bike sharing systems). Long-term commitment is also weakened as cycling provision lacks the high profile of other infrastructure investments (such as, for example, the metro) and is associated with being 'cheap' (Aldred, 2013).
Compreender a relação entre a Educação Física e o rendimento académico é importante para o desenv... more Compreender a relação entre a Educação Física e o rendimento académico é importante para o desenvolvimento de políticas educativas mais fundamentadas com o objectivo de melhorar o desempenho académico dos estudantes. Objectivo: O objectivo desta revisão foi fazer uma síntese dos estudos que abordam a relação entre a Educação Física e o rendimento académico dos jovens. Método: Os estudos foram identificados através de uma pesquisa em 8 bases de dados (EBSCO, Web of Science, Dialnet, Health Refere...
Additional file 4 Supplementary Fig. 4. BACH1 knockdown stimulates insulin secretion. BACH1 mRNA ... more Additional file 4 Supplementary Fig. 4. BACH1 knockdown stimulates insulin secretion. BACH1 mRNA expression assayed by qPCR in INS-1E cells (A) and human islets (B) exposed to palmitate for 24 h. (C-D) Human islet cells were transfected with BACH1 siRNA or control siRNA (siCT) and treated with palmitate for 24 h. (C) BACH1 mRNA expression measured by qPCR. (D) Apoptosis evaluated by DNA-binding dyes. (E-I) INS-1E cells were transfected with control siRNA or two different Bach1 siRNAs. mRNA expression measured by qPCR of Bach1 (E) and heme oxygenase 1 (Hmox1) (F), a transcriptional target of Bach1. Insulin content (G) and insulin secretion after incubation with 1.7 mM and 16.7 mM glucose (H) or 1.7 mM glucose and 1.7 mM glucose plus 30 mM KCl (I). Insulin secretion and content were measured by ELISA and corrected by total protein content. Data are from 4 to 7 independent experiments. *p
Proceedings of the SMC Conferences, Jul 21, 2010
The Bag-of-Frames (BoF) approach has been widely used in music genre classification. In this appr... more The Bag-of-Frames (BoF) approach has been widely used in music genre classification. In this approach, music genres are represented by statistical models of low-level features computed on short frames (e.g. in the tenth of ms) of audio signal. In the design of such models, a common procedure in BoF approaches is to represent each music genre by sets of instances (i.e. frame-based feature vectors) inferred from training data. The common underlying assumption is that the majority of such instances do capture somehow the (musical) specificities of each genre, and that obtaining good classification performance is a matter of size of the training dataset, and fine-tuning feature extraction and learning algorithm parameters. We report on extensive tests on two music databases that contradict this assumption. We show that there is little or no benefit in seeking a thorough representation of the feature vectors for each class. In particular, we show that genre classification performances are similar when representing music pieces from a number of different genres with the same set of symbols derived from a single genre or from all the genres. We conclude that our experiments provide additional evidence to the hypothesis that common low-level features of isolated audio frames are not representative of music genres.
Case Studies on Transport Policy, 2022
Esta tese tem como objetivo procurar respostas para a seguinte pergunta de partida: Na perceção d... more Esta tese tem como objetivo procurar respostas para a seguinte pergunta de partida: Na perceção dos profissionais, qual é a relação que existe entre a liderança autêntica e os comportamentos positivos nas escolas públicas portuguesas? Nesse sentido, usamos estudos empíricos, dois quantitativos e um qualitativo, para testar essa relação com os comportamentos declarados, chamamento e envolvimento no trabalho, por professores e, confiança, pelos diretores das escolas. Concluímos que todos os elementos essenciais de uma organização autentizótica contribuem para explicar o que as pessoas esperam potencialmente das suas organizações: condições materiais adequadas e uma contribuição com sentido. Não confirmámos a relação entre a liderança autêntica (LA) e os comportamentos positivos. Isso promoveu mesmo a possibilidade da influência da LA não ser sentida pelos seguidores. No entanto, verificou-se uma relação positiva e significativa entre o chamamento e o envolvimento no trabalho. O chamamento moderou ainda, com um resultado positivo e significativo, a relação entre a LA e o envolvimento no trabalho. Concluímos finalmente que a autoconfiança é uma característica comum dos diretores e que a compassividade e a assertividade devem combinar-se para alcançar a liderança autêntica baseada na confiança inteligente, o que é descrito num modelo matricial construído a partir dos dados.
is expressed in retina endothelial cells at artery
The Bag-of-Frames (BoF) approach has been widely used in music genre classification. In this appr... more The Bag-of-Frames (BoF) approach has been widely used in music genre classification. In this approach, music genres are represented by statistical models of low-level features computed on short frames (e.g. in the tenth of ms) of audio signal. In the design of such models, a common procedure in BoF approaches is to represent each music genre by sets of instances (i.e. frame-based feature vectors) inferred from training data. The common underlying assumption is that the majority of such instances do capture somehow the (musical) specificities of each genre, and that obtaining good classification performance is a matter of size of the training dataset, and fine-tuning feature extraction and learning algorithm parameters. We report on extensive tests on two music databases that contradict this assumption. We show that there is little or no benefit in seeking a thorough representation of the feature vectors for each class. In particular, we show that genre classification performances ar...