772 resultados para Ranking and Selection
Resumo:
The present dissertation aims to analyze the evaluation process of environmental performance inside an organization from the building construction section of civil construction based on the NBR ISO 14031 guidelines, which provide orientation regarding the implementation of this project towards the internal organizational management. The theoretical research has addressed concepts and historical development of environmental management inside organizations, from the emergence of the first models to the strengthening of environmental management through the standardization of the Environmental Management System caused by the publication of ISO 14001. It has also addressed the evaluation of environmental performance, the NBR ISO 14031 (concepts, types of indicators of evaluation of environmental performance, the elaboration process of such indicators, as well as its use and evaluation by the high administration). The research has an applied character, with exploratory and descriptive goals, and a qualitative approach based on case study. The data collection will be made through questionnaires, interviews, and documental analysis. Through the present research project, one expects to learn the elements taken into consideration by the organization for the elaboration and selection of indicators; to identify which interested parties contribute in the aforementioned process; to discover which sources are taken into consideration by the organization while establishing its environmental performance goals; to learn how the different kinds of environmental indicators are handled by organizations on daily basis, considering the existence of interferences on the decision making process, whether or not the interested parties are integrated, and if there is an periodical evaluation of environmental performance and how it is handled. One also expects to identify the opportunities for improvement regarding the organization that is object of study.
Resumo:
The quantitative diatom analysis of 218 surface sediment samples recovered in the Atlantic and western Indian sector of the Southern Ocean is used to define a base of reference data for paleotemperature estimations from diatom assemblages using the Imbrie and Kipp transfer function method. The criteria which justify the exclusion of samples and species out of the raw data set in order to define a reference database are outlined and discussed. Sensitivity tests with eight data sets were achieved evaluating the effects of overall dominance of single species, different methods of species abundance ranking, and no-analog conditions (e.g., Eucampia Antarctica) on the estimated paleotemperatures. The defined transfer functions were applied on a sediment core from the northern Antarctic zone. Overall dominance of Fragilariopsis kerguelensis in the diatom assemblages resulted in a close affinity between paleotemperature curve and relative abundance pattern of this species downcore. Logarithmic conversion of counting data applied with other ranking methods in order to compensate the dominance of F. kerguelensis revealed the best statistical results. A reliable diatom transfer function for future paleotemperature estimations is presented.
Resumo:
Les institutions de mémoire et de savoir (par exemple, les bibliothèques, les archives, les musées) font face à des défis importants dans leurs responsabilités d’assurer la pérennité du patrimoine documentaire à l’ère numérique. Citons la surabondance de l’information numérique, la possibilité de production, théoriquement illimitée, offerte aux individus comme aux groupes sociaux, les limites dans les capacités de stockage et de diffusion de l’information numérique qui sont à la disposition des institutions mandataires du patrimoine documentaire. De plus, il est apparu que les approches et les méthodes utilisées pour identifier, gérer, préserver et diffuser le patrimoine documentaire de la société canadienne dans un environnement analogique n’étaient transférables à un environnement numérique. Nous suggérons que la théorie sociale de la connaissance peut servir de base à une réflexion portant sur le développement d’une politique publique qui viserait à encadrer l’identification, la sélection, la gestion et la préservation du patrimoine documentaire d’une société à l'ère numérique. Nous définissons la problématique puis proposons des réponses à travers trois articles scientifiques. Les résultats indiquent que les connaissances et les pratiques professionnelles utilisées demeurent persistantes et limitent la formulation et l'application de nouveaux cadres théoriques, de politiques administratives et de techniques associés à l'identification et la sélection du patrimoine documentaire. Cette recherche propose un cadre conceptuel qui permet de développer des politiques publiques sur le patrimoine documentaire du Canada.
Resumo:
The main goal of this thesis was to prepare medium-chain-length poly-3-hydroxyalkanoate (mcl-PHA) nanoparticle suspensions at high solids content (≥ 10 % w/v). A two-stage emulsification-solvent evaporation process was employed to produce poly-3-hydroxydecanoate (PHD) suspensions. The formulation and processing conditions including ultrasonication time and amplitude, selection of solvent, and selection of surfactants and their concentrations were investigated to make concentrated suspensions (10 and 30 % (w/v)) of PHD with particles less than 300 nm. Among the ionic surfactants tested to stabilize the suspension, the anionic, sodium dodecyl sulphate (SDS), and the cationic, dodecyltrimethylammonium bromide (DTAB) surfactants produced the smallest particle sizes (~100 nm). However, more stabilized nanoparticles were obtained when the ionic surfactant, SDS, was combined with any of the non-ionic surfactants tested, with polyoxyethylene octyl phenyl ether (Triton X-100) or polyoxyethylene (20) sorbitan monooleate (Tween 80) resulting in a slight increase in zeta potential over 30 days while the zeta potential with other non-ionic surfactants decreased. Mcl-PHA containing 11 and 18 % of carboxyl groups was synthesized via free radical addition reaction of 11-mercaptoundecanoic acid to the pendant double bonds of unsaturated poly-3-hydroxynonanoate (PHNU). Colloidal suspensions prepared by ultrasonication needed a surfactant to maintain stability, even at 0.4 % solids of mcl-PHA containing 11 % carboxylation (PHNC-1) unlike the stable suspensions prepared without surfactants by the titration method. Similar particle sizes (155.6 ± 8.4 to 163.4 ± 11.3 nm) and polydispersity indices (0.42 ± 0.03 to 0.49 ± 0.04) were obtained when several non-ionic surfactants were tested to minimize particle agglomeration, with the smallest particles obtained with Triton X-100. When Triton X-100 was combined with a variety of ionic surfactants, smaller nanoparticles (97.1 ± 1.1 to 121.7 ± 5.7 nm) with a narrower particle size distribution (0.21 ± 0.001 to 0.25 ± 0.003) were produced. The SDS and Triton X-100 combination was chosen to evaluate other mcl-PHAs at 10 % (w/v) solids content. Slightly smaller nanoparticles were formed with carboxylated mcl-PHAs compared to mcl-PHAs having aliphatic pendant side chains. Mcl-PHA consisting of 18 % carboxylation (PHNC-2) formed a much smaller nanoparticles and higher zeta potential.
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This paper considers the analysis of data from randomized trials which offer a sequence of interventions and suffer from a variety of problems in implementation. In experiments that provide treatment in multiple periods (T>1), subjects have up to 2^{T}-1 counterfactual outcomes to be estimated to determine the full sequence of causal effects from the study. Traditional program evaluation and non-experimental estimators are unable to recover parameters of interest to policy makers in this setting, particularly if there is non-ignorable attrition. We examine these issues in the context of Tennessee's highly influential randomized class size study, Project STAR. We demonstrate how a researcher can estimate the full sequence of dynamic treatment effects using a sequential difference in difference strategy that accounts for attrition due to observables using inverse probability weighting M-estimators. These estimates allow us to recover the structural parameters of the small class effects in the underlying education production function and construct dynamic average treatment effects. We present a complete and different picture of the effectiveness of reduced class size and find that accounting for both attrition due to observables and selection due to unobservable is crucial and necessary with data from Project STAR
Resumo:
Este artículo presenta una investigación en la que se analizan las dificultades del profesorado para planificar, coordinar y evaluar competencias claves en una muestra de 23 centros educativos. El tema tiene hondas repercusiones ya que una mala praxis educativa de las competencias claves puede conculcar uno de los derechos fundamentales del alumnado a ser evaluado de forma objetiva (LODE: Art.6b y RD 732/1995: Art. 13.1) y poder superar las pruebas de evaluación consideradas necesarias para la obtención del título académico mínimo que otorga el estado español. La investigación se ha desarrollado desde una doble perspectiva metodológica; en primer lugar, es una investigación descriptiva en la que presentamos las características fundamentales de las competencias claves y la normativa básica para su desarrollo y evaluación. En segundo lugar, aplicamos un procedimiento de análisis con una doble vertiente cualitativa mediante el empleo del programa Atlas-Ti y del enfoque reticular-categorial del análisis de redes sociales con la aplicación de UCINET y el visor yED Graph Editor para abordar el análisis de las principales dificultades y obstáculos detectados. Los resultados muestran que existen serias dificultades en las tres dimensiones analizadas: "planificación", "coordinación" y "evaluación" de competencias clave; especialmente en la necesidad de formación del profesorado, en la evaluación de las competencias, en la metodología para su desarrollo y en los procesos de coordinación interna para su consecución en los centros educativos.
Resumo:
Las etapas del cambio fonético-fonológico han sido descritas desde hace décadas, especialmente desde un punto de vista articulatorio y casi siempre partiendo de los testimonios escritos de que se podía disponer. No obstante, recientemente han ido surgiendo nuevas teorías que defienden que el cambio puede ser explicado a través del estudio de la variación y los procesos fonéticos propios del habla actual, puesto que ambos están relacionados con fenómenos de hipo (e hiper) articulación y, a la postre, de coarticulación. Una de ellas es la Fonología Evolutiva (Blevins 2004), aun cuando no ofrece una explicación satisfactoria para la difusión del cambio. En este estudio, se ha recurrido a estas teorías para esclarecer las causas de la evolución de dos contextos de yod segunda: /nj/ y /lj/, que llevaron a la fonologización de // y //, en un primer estadio de la historia del español.
Resumo:
Skeletal muscle wasting and weakness are major complications of critical illness and underlie the profound physical and functional impairments experienced by survivors after discharge from the intensive care unit (ICU). Exercise-based rehabilitation has been shown to be beneficial when delivered during ICU admission. This review aimed to determine the effectiveness of exercise rehabilitation initiated after ICU discharge on primary outcomes of functional exercise capacity and health-related quality of life. We sought randomized controlled trials, quasi-randomized controlled trials, and controlled clinical trials comparing an exercise intervention commenced after ICU discharge vs. any other intervention or a control or ‘usual care’ programme in adult survivors of critical illness. Cochrane Central Register of Controlled Trials, Medical Literature Analysis and Retrieval System Online (MEDLINE), Excerpta Medica Database, and Cumulative Index to Nursing and Allied Health Literature databases were searched up to February 2015. Dual, independent screening of results, data extraction, and quality appraisal were performed. We included six trials involving 483 patients. Overall quality of evidence for both outcomes was very low. All studies evaluated functional exercise capacity, with three reporting positive effects in favour of the intervention. Only two studies evaluated health-related quality of life and neither reported differences between intervention and control groups. Meta-analyses of data were precluded due to variation in study design, types of interventions, and selection and reporting of outcome measurements. We were unable to determine an overall effect on functional exercise capacity or health-related quality of life of interventions initiated after ICU discharge for survivors of critical illness. Findings from ongoing studies are awaited. Future studies need to address methodological aspects of study design and conduct to enhance rigour, quality, and synthesis.
Resumo:
BACKGROUND:
Evidence regarding the association of the built environment with physical activity is influencing policy recommendations that advocate changing the built environment to increase population-level physical activity. However, to date there has been no rigorous appraisal of the quality of the evidence on the effects of changing the built environment. The aim of this review was to conduct a thorough quantitative appraisal of the risk of bias present in those natural experiments with the strongest experimental designs for assessing the causal effects of the built environment on physical activity.
METHODS:
Eligible studies had to evaluate the effects of changing the built environment on physical activity, include at least one measurement before and one measurement of physical activity after changes in the environment, and have at least one intervention site and non-intervention comparison site. Given the large number of systematic reviews in this area, studies were identified from three exemplar systematic reviews; these were published in the past five years and were selected to provide a range of different built environment interventions. The risk of bias in these studies was analysed using the Cochrane Risk of Bias Assessment Tool: for Non-Randomized Studies of Interventions (ACROBAT-NRSI).
RESULTS:
Twelve eligible natural experiments were identified. Risk of bias assessments were conducted for each physical activity outcome from all studies, resulting in a total of fifteen outcomes being analysed. Intervention sites included parks, urban greenways/trails, bicycle lanes, paths, vacant lots, and a senior citizen's centre. All outcomes had an overall critical (n = 12) or serious (n = 3) risk of bias. Domains with the highest risk of bias were confounding (due to inadequate control sites and poor control of confounding variables), measurement of outcomes, and selection of the reported result.
CONCLUSIONS:
The present review focused on the strongest natural experiments conducted to date. Given this, the failure of existing studies to adequately control for potential sources of bias highlights the need for more rigorous research to underpin policy recommendations for changing the built environment to increase physical activity. Suggestions are proposed for how future natural experiments in this area can be improved.
Resumo:
Eine effiziente Gestaltung von Materialbereitstellungsprozessen ist eine entscheidende Voraussetzung für die Sicherstellung einer hohen Verfügbarkeit von Materialien in der Montage. Die Auswahl adäquater Bereitstellungsstrategien muss sich stets an den Anforderungen des Materialbereitstellungsprozesses orientieren. Die Leistungsanforderungen an eine effektive Materialbereitstellung werden maßgeblich durch den Montageprozess determiniert. Diesen Leistungsanforderungen ist eine passgenaue Materialbereitstellungsstrategie gegenüberzustellen. Die Formulierung der Leistungsanforderungen kann dabei in qualitativer oder quantitativer Form erfolgen. Allein die Berücksichtigung quantitativer Daten ist unzureichend, denn häufig liegen zum Zeitpunkt der Planung weder belastbare quantitative Daten vor, noch erscheint der Aufwand zu deren Ermittlung angemessen. Zudem weisen die herkömmlichen Methoden, die im Rahmen der Auswahl von Materialbereitstellungsstrategien häufig eingesetzt werden, den Nachteil auf, dass eine Nichterfüllung einer bestimmten Leistungsanforderung durch eine besonders gute Erfüllung einer anderen Leistungsanforderung kompensiert werden kann (Zeit vs. Qualität). Um die Auswahl einer Materialbereitstellungsstrategie unter Berücksichtigung qualitativer und quantitativer Anforderungen durchführen zu können, eignet sich in besonderer Weise die Methode des Fuzzy Axiomatic Designs. Diese Methode erlaubt einen Abgleich von Anforderungen an den Materialbereitstellungsprozess und der Eignung unterschiedlicher Materialbereitstellungsstrategien.
Resumo:
[EN]This paper describes a real-time approach for face detection and selection of frontal views, for further processing. Typically, face detection papers provide results for a set of single images but the problem of face detection in video streams rarely is tackled. Instead of performing an exhaustive search for every video stream frame a set of opportunistic ideas applied in a cascade fashion and based on temporal and spatial coherence provide promising results in real-time.
Resumo:
RAMOS, A. S. M.; OLIVEIRA, M. A. Fatores de sucesso na implementação de sistemas integrados de gestão empresarial (ERP): estudo de caso em uma média empresa. In: ENCONTRO NACIONAL DE ENGENHARIA DE PRODUÇÂO, 22., 2002, Curitiba-PR. Anais... Porto Alegre-RS: ABEPRO, 2002. v. 1.
Resumo:
[EN]This paper describes the approach for face detection and selection of frontal views, for further processing. This approach based on color detection and symmetry operator application, is integrated in an Active Vision System o ering promising results just making use of some opportunistic skills.
Resumo:
O presente trabalho tem como objetivo geral estudar a gestão de recursos humanos (GRH) no terceiro setor, focando-se especificamente nas Instituições Particulares de Solidariedade Social (IPSS). Estas organizações têm vindo a demonstrar um papel cada vez mais relevante nas comunidades em que se inserem, pela sua missão em prestar serviços de cariz social e pela atual relevância como entidades empregadoras. A diversidade presente nas IPSS ao nível da estrutura, funcionamento, dimensão, organização e dinâmicas internas, proporciona o estudo e reflexão das especificidades na GRH. Para isso, abordam-se um conjunto de aspetos: i) diferenças entre meio empresarial e terceiro setor na GRH; ii) implicações da diversidade de respostas sociais e suas especificidades na gestão de pessoas; iii) o papel do Instituto de Segurança Social e as implicações legais na gestão de pessoas; iv) a localização geográfica e acesso a recursos humanos qualificados; v) a perspetiva das IPSS sobre os recursos humanos; vi) o perfil profissional dos colaboradores das IPSS; vii) práticas quotidianas na gestão de recursos humanos nas IPSS; viii) características da GRH nas IPSS (administrativa ou estratégica); ix) responsáveis pela GRH nas IPSS; x) o papel dos órgãos sociais na GRH; xi) profissionalização versus voluntariado; xii) a GRH, certificação e qualidade; xiii) as tendências do terceiro setor na gestão de pessoas. Foi utilizada uma metodologia qualitativa e aplicada a técnica de entrevista para recolher o conhecimento, experiências e perspetivas de diferentes interlocutores do terceiro setor, dirigentes, técnicos superiores, diretores de serviço, investigadores e representantes nacionais e distritais das IPSS. Da sistematização e análise dos dados recolhidos retiraram-se várias conclusões. As pessoas são consideradas o recurso mais importante para estas organizações, pela natureza social e humana das atividades desenvolvidas, prestadas por pessoas e destinadas a pessoas. Neste sentido, é demonstrada a importância do potencial humano aquando do recrutamento e seleção, pela primazia de requisitos como o relacionamento interpessoal em detrimento das qualificações. O perfil profissional característico das IPSS reconhece a importância da polivalência, disponibilidade, comprometimento, confiança, proximidade afetiva, voluntarismo e sentido de missão dos colaboradores, os quais tendem a ser são vistos como investimento tanto quanto reúnam estes aspetos; caso contrário podem ser encarados como custo. Quanto à acessibilidade a recursos humanos, surgem diferentes modalidades, consoante fatores de localização, dimensão, formação e estrutura organizacional, bem como o fenómeno da fuga de mão de obra, indício da dificuldade em captar e reter recursos humanos. O modelo de GRH nas IPSS é de cariz tradicional, caracterizado por uma gestão porimproviso com diferentes níveis de sensibilidade e capacidade das IPSS, no que concerne à implementação de processos de GRH, tais como sistemas de progressão na carreira, recrutamento interno e sistemas de avaliação de desempenho. Quanto aos aspetos da motivação e satisfação profissional, é assumida a importância da proximidade e apoio aos colaboradores, indicativos de um sistema de recompensas informal. É percetível a resistência na aplicação de técnicas de desenvolvimento organizacional, comprovada pela limitação na formação dos quadros de colaboradores. No entanto as IPSS são confrontadas com a rigidez dos instrumentos legais. A responsabilidade pela GRH é mais ou menos partilhada entre a direção técnica e os órgãos sociais, condicionada pelo estilo de liderança e relação de confiança entre si, em norma, pouco clara quanto aos papéis e funções desempenhadas. Por fim, é percebida a necessidade de coexistência de uma gestão profissionalizada e de direções voluntárias mais capacitadas e sensibilizadas para o desenvolvimento de metodologias e estratégias de gestão de pessoas, adaptadas às especificidades das IPSS. Este trabalho pretende contribuir com um espaço de reflexão para a elaboração de respostas mais eficazes e inovadoras que proporcionem o desenvolvimento organizacional, face às necessidades e transformações do terceiro setor. / This work main objective is the study of human resource management (HRM) in the third sector. It is focused specifically on Instituições Particulares de Solidariedade Social [Private Institutions for Social Solidarity] (IPSS). These kind of organizations have demonstrated an increased value in the communities they are inserted in, by providing social care services and by generating new jobs in the local communities. The study and reflection of HRM specificities is based on the variety in the structure, the purpose, the size, the internal organization and the dynamics of the different IPSS. For this purpose we explored the following aspects : i) the differences between business community and the third sector in HRM; ii) the implications of social responses diversity in people management; iii) the role of the National Insurance Institute and the legal impact on people management; iv) the geographic location and the IPSS access to skilled human resources; v) the understanding of IPSS on human resources; vi) the professional profile of IPSS employees; vii) the daily practices in human resource management on the IPSS; viii) the characteristics of HRM in IPSS (managerial or strategic); ix) who is responsible for HRM in IPSS; x) the role of executive board in HRM; xi) professionalization versus voluntary work; xii) HRM, quality and certification; xiii) the third sector trends in people management. The qualitative method and the interview technique were applied in order to gather knowledge, experiences and perspectives from several sources such as, different partners of the third sector, managers, service directors, technicians, researchers and national and local IPSS representatives. The results indicate several conclusions. Firstly the human resources are the most important resource of IPSS organizations due to the social nature of the services provided by them but also the importance of, the individual and social, skills required for these activities that are provided by people and are directed to people. This demonstrates the importance of interpersonal skills over professional qualifications during recruitment and selection. The IPSS recognize in their professionals the importance of versatility, availability, commitment, confidence, emotional proximity, voluntarism and sense of mission. If an employee fulfills these requirements, is considered an investment; otherwise might be seen as a cost. Regarding the accessibility of IPSS to qualified human resources, we consider different models, depending on location, size and training and organizational structure as well as the phenomenon run of hand labor, defined as the index of difficulty in capturing and retaining human resources. The model of HRM in IPSS is traditional in its nature and is characterized by management based on improvisation at different levels, regarding the implementation ofHRM processes such as career advancement systems, internal recruitment and performance evaluation. In regards to motivation and job satisfaction, it is valued the proximity and the support to the employees, showing therefore an informal system of rewards. There is a noticeable resistance to the application of organizational techniques which is demonstrated by controlling the formation of employees. However the IPSS are required to face the rigidity of legal instruments. The responsibility for HRM is shared between the technical direction and the management bodies, which depends on leadership style and mutual trust, and is generally unclear about the roles and duties performed. Finally, it becomes evident the need for coexistence between a professional management and a voluntary management, more capable and more sensible to the development of methods and strategies for people management, specifically adapted to each IPSS. This paper aims to contribute with space for reflection in the development of more effective and innovative responses for the organizational development, given the needs and transformations of the third sector.