The acquisition of a scene-specific normal behaviour model underlies many existing approaches to the problem of automated video surveillance. Since it is unrealistic to acquire a comprehensive set of labelled behaviours for every surveyed scenario, modelling normal behaviour typically corresponds to modelling the distribution of a large collection of unlabelled examples. In general, however, it would be desirable to be able to filter an unlabelled dataset to remove potentially anomalous examples. This thesis proposes a simple semi-supervised learning framework that could allow a human operator to efficiently filter the examples used to construct a normal behaviour model by providing occasional feedback: Specifically, the classification output of the model under construction is used to filter the incoming sequence of unlabelled examples so that human approval is requested before incorporating any example classified as anomalous, while all other examples are automatically used for training. A key component of the proposed framework is an incremental one-class learning algorithm which can be trained on a sequence of normal examples while allowing new examples to be classified at any stage during training. The proposed algorithm represents an initial set of training examples with a kernel density estimate, before using merging operations to incrementally construct a Gaussian mixture model while minimising an information-theoretic cost function. This algorithm is shown to outperform an existing state-of-the-art approach without requiring off-line model selection. Throughout this thesis behaviours are considered in terms of whole motion trajectories: in order to apply the proposed algorithm, trajectories must be encoded with fixed length vectors. To determine an appropriate encoding strategy, an empirical comparison is conducted to determine the relative class-separability afforded by several different trajectory representations for a range of datasets. The results obtained suggest that the choice of representation makes a small but consistent difference to class separability, indicating that cubic B-Spline control points (fitted using least-squares regression) provide a good choice for use in subsequent experiments. The proposed semi-supervised learning framework is tested on three different real trajectory datasets. In all cases the rate of human intervention requests drops steadily, reaching a usefully low level of 1% in one case. A further experiment indicates that once a sufficient number of interventions has been provided, a high level of classification performance can be achieved even if subsequent requests are ignored. The automatic incorporation of unlabelled data is shown to improve classification performance in all cases, while a high level of classification performance is maintained even when unlabelled data containing a high proportion of anomalous examples is presented.

The continuous growth in flight operations has led to public concern regarding the impact of aviation on the environment with its anthropogenic contribution to global warming. Several solutions have been proposed in order to reduce the environmental impact of aviation. However most of them are long term solutions such as new environmental friendly aircraft and engine designs. In this respect, management of aircraft trajectory and mission is a potential short term solution that can readily be implemented. Therefore, in order to truly understand the optimised environment friendly trajectories that can be actually deployed by airlines, it is important to investigate the impact of degraded engine performance on real aircraft trajectories at multi-disciplinary level. Several trajectory optimisation studies have been conducted in this direction in the recent past, but engines considered for the studies were clean and trajectories were ideal and simple. This research aims to provide a methodology to enhance the conventional approach of the aircraft trajectory optimisation problem by including engine degradation and real aircraft flight paths within the optimisation loop (framework); thereby the impact of engine degradation on optimum aircraft trajectories were assessed by quantifying the difference in fuel burn and emissions, when flying a trajectory which has been specifically optimised for an aircraft with degraded engines and flying a trajectory which has been optimised for clean engines. For the purpose of this study models of a clean and two levels of degraded engines have been developed that are similar to engines used in short range and long range aircraft currently in service. Degradation levels have been assumed based on the deterioration levels of Exhaust Gas Temperature (EGT) margin. Aircraft performance models have been developed for short range and long range aircraft with the capability of simulating (generating) vertical and horizontal flight profiles provides by the airlines. An emission prediction model was developed to assess NOx emissions of the mission. The contrail prediction model was adopted from previous studies to predict contrail formation. In addition, a multidisciplinary aircraft trajectory optimisation framework was developed and employed to analyse short range flight trajectories between London and Amsterdam and long range flight trajectories between London and Colombo under three cases. Case_1: Aircraft with clean engines, Case_2 and Case_3 were Aircraft with two different levels of degraded engines having a 5% and 10% Exhaust Gas Temperature (EGT) increase respectively. Three different multi objective optimisation studies were performed; (1) Fuel burn vs Flight time, (2) Fuel burn vs NOx emission, and (3) Fuel burn vs Contrails. Finally optimised trajectories generated with degraded engines were compared with the optimised trajectories generated with clean engines ... [cont].

A mineração modifica profundamente os ecossistemas naturais e, embora a recuperação dessas áreas seja exigida pela legislação, trata-se ainda de um grande desafio técnico. Geralmente, as estratégias de recuperação envolvem a distribuição de solo florestal superficial, a semeadura de gramíneas exóticas para cobrir o solo, chamada de \"tapete verde\", e o plantio de mudas de árvores exóticas e/ou nativas. No entanto, a semeadura de gramíneas exóticas pode restringir a regeneração de espécies nativas, sendo a avaliação da sua viabilidade ecológica necessária para determinar sua real necessidade. Nesse contexto, o objetivo desse trabalho foi avaliar se é necessário o uso de gramíneas exóticas para o recobrimento inicial do solo na recuperação de florestas tropicais em áreas de mineração de bauxita, bem como se a trajetória ecológica gerada apresenta potencial de retorno às condições pré-distúrbio. Sendo assim, utilizamos um estudo de caso de recuperação de minas de exploração de bauxita na Mata Atlântica do Brasil na região de Poços de Caldas-MG, na qual foram comparadas cronossequências de dois métodos de restauração de minas de bauxita - restauração florestal sem tapete verde (Rs) e restauração florestal com tapete verde (Rc) - tendo-se trechos de floresta nativa como ecossistema de referência. Foram avaliados dados de estrutura (cobertura de gramínea, cobertura de dossel, área basal, densidade de indivíduos com DAP ≥ 1 cm e altura ≥130 cm - classe 1 - e densidade de indivíduos com DAP < 1 cm e altura ≥ 50 cm - classe 2) e composição (riqueza, diversidade, equabilidade, riqueza e porcentagem de espécies por síndrome de dispersão). A definição da trajetória ecológica foi realizada por meio de regressões lineares. O método de restauração florestal sem tapete verde alcançou resultados superiores ao método Rc em parâmetros importantes para o estabelecimento da floresta, como cobertura de gramíneas, cobertura de dossel, riqueza e diversidade da classe 1. O método Rs também teve resultados semelhantes à Rc em vários parâmetros, apesar da idade inferior. Os dois métodos apresentaram tendências de evolução em direção aos parâmetros do ecossistema de referência, porém o método Rs, se mantiver a trajetória atual, pode alcançá-los mais rapidamente, o que reduz gastos com manutenção e manejo. Tais evidências mostram que o uso de gramíneas exóticas para recobrimento inicial de áreas mineradas não é necessário em projetos que visem à restauração florestal de áreas de mineração, pois essas prejudicam o restabelecimento da dinâmica florestal. Adicionalmente, mostrou-se ser possível recuperar áreas mineradas de bauxita com metas ecológicas mais ambiciosas, que visem o retorno de condições similares às existentes pré-distúrbio. / Mining profoundly alters natural ecosystems and, although the recovery of these areas is required by law, it is still a major technical challenge. Generally, recovery strategies involve the distribution of surface forest soil, planting of exotic grasses to cover the ground and the planting of exotic and/or native trees. However, the sowing of exotic grasses may restrict native species regeneration, therefore, context specific diagnosis must be carried out to determine the actual need of using such technique. In this context, the aim of this study was to evaluate whether the use of exotic grasses for initial soil covering in the recovery of tropical forests in areas of bauxite mining is necessary, as well as if the restored community has potential to return to the pre-disturbance conditions. Therefore, we use a case study of recovery of bauxite exploration in the Atlantic Forest region of Brazil in Pocos de Caldas, Minas Gerais, where chronosequences of two methods of restoration of bauxite mines were compared - restoration without exotic grasses (Rs) and forest restoration with exotic grasses (Rc) - taking up stretches of native forest ecosystem as a reference. We collected data on tree community structure (grass cover, canopy cover, basal area, and density of individuals CBH ≥3.1 cm and height ≥ 130 cm (1 class) and density of individuals DAP < 3.1 cm and height ≥ 50 cm (class 2) and composition (richness, diversity, evenness and richness and percentage of species by dispersion syndrome). The successional path was analyzed by linear regression. In class 1, the method of forest restoration without exotic grasses (Rs) achieved better results than Rc in key parameters for forest establishment, such as exotic grass cover, canopy cover, richness and diversity. The Rs method also had similar results to Rc in several parameters, despite being represented by younger communities. Both methods showed trends toward the parameters values found in reference ecosystem, but Rs method, if it remain the current way, can reach these values more quickly, which reduces maintenance costs and management. Such evidence shows that the use of exotic grasses for initial covering of mined areas is not necessary in projects aimed at forest restoration of mining areas, as these hinder the restoration of forest dynamics. Additionally, we proved to be possible to recover the bauxite mined areas with more ambitious ecological goals, aiming at the return of pre-disturbance conditions.

"Recent works on the control of wheeled mobile robots have shifted from the use of the kinematic model to the use of the dynamic model. Since theoretical results typically treat the inputs to the dynamic model as torques, few experimental results have been provided, as torque is typically not the input to most commercially available robots. Few papers have implemented controllers based on the dynamic model, and those that have did not address the issue of identifying the parameters of the dynamic model. This work focuses on a method for identifying the parameters of the dynamic model of a wheeled mobile robot. The method is shown to be both effective and easy to implement, and requires no prior knowledge of what the parameters may be. Experimental results on two mobile robots of different scale demonstrate its effectiveness. The estimates of the parameters created by the proposed method are then used in an adaptive controller to verify their accuracy. For future work, this method should be completed autonomously in a two-part manner, onboard the mobile robot. First, the robot should perform the method proposed here to generate an initial parameter estimate, and then use adaptive control to update the estimates."

Mining spatio-temporal reachable regions aims to find a set of road segments from massive trajectory data, that are reachable from a user-specified location and within a given temporal period. Accurately extracting such spatio-temporal reachable area is vital in many urban applications, e.g., (i) location-based recommendation, (ii) location-based advertising, and (iii) business coverage analysis. The traditional approach of answering such queries essentially performs a distance-based range query over the given road network, which have two main drawbacks: (i) it only works with the physical travel distances, where the users usually care more about dynamic traveling time, and (ii) it gives the same result regardless of the querying time, where the reachable area could vary significantly with different traffic conditions. Motivated by these observations, in this thesis, we propose a data- driven approach to formulate the problem as mining actual reachable region based on real historical trajectory dataset. The main challenge in our approach is the system efficiency, as verifying the reachability over the massive trajectories involves huge amount of disk I/Os. In this thesis, we develop two indexing structures: 1) spatio-temporal index (ST-Index) and 2) connection index (Con-Index) to reduce redundant trajectory data access operations. We also propose a novel query processing algorithm with: 1) maximum bounding region search, which directly extracts a small searching region from the index structure and 2) trace back search, which refines the search results from the previous step to find the final query result. Moreover, our system can also efficiently answer the spatio-temporal reachability query with multiple query locations by skipping the overlapped area search. We evaluate our system extensively using a large-scale real taxi trajectory data in Shenzhen, China, where results demonstrate that the proposed algorithms can reduce 50%-90% running time over baseline algorithms.

Made available in DSpace on 2015-03-05T12:06:15Z (GMT). No. of bitstreams: 0 Previous issue date: 2 / Nenhuma / Este estudo qualitativo teve como objetivo conhecer a trajetória de Mario Osorio Marques na construção do desenvolvimento regional do Noroeste, do Rio Grande do Sul aqui compreendida (pelo município de Ijuí e pelos municípios do seu entorno). A hipótese principal é que as palavras, práticas e ações (participativas, associativas e de confiança) escritas, desenvolvidas e utilizadas por Frei Matias/ Mario Osorio junto à comunidade local e regional contribuíram para o desenvolvimento dessa região. Compreende esta tese um estudo biográfico de Mario Osorio Marques, nascido no ano de 1925, no século XX. Para tanto analisei sua origem, formação religiosa, formação intelectual e militância social e a maneira como ele pensava a Universidade de Ijuí. Uma universidade inserida na comunidade promovendo o desenvolvimento local e regional desde a sua criação – FAFI/ FIDENE/UNIJUÍ. No desenvolver da pesquisa procurei manter a idéia de que o estudo biográfico é inseparável do exame das “circunstâncias” e através da narrativa / This qualitative study aimed to ascertain the trajectory of Mario Osorio Marques in the construction of the Northwest regional development – Rio Grande do Sul, here understood as the municipality of Ijuí and the municipalities of it surroundings. The hypothesis is that the words, actions and practices (participatory, associative and confidence) written, developed and used by Frei Matias/Mario Osorio at the regional and local community contributed to the development of the region. This thesis includes a biographical study of Mario Osorio Marques, born in the year of 1925, in the twentieth century. For in such a way, I analyzed his origin, religious formation, intellectual formation and social militancy and the way as it thought the University of Ijuí. The university inserted in the community by promoting local and regional development since its creation – FAFI/FIDENE/UNIJUÍ. In the development of the research I tried to keep the idea that the biographical study is inseparable from the examination of "circumsta

Este estudo objetivou analisar de que modo a vivência em uma das maiores empresas mundiais de auditoria (Big Four) influenciou na construção das trajetórias de carreira dos contadores que lá tiveram experiência como auditor ou consultor. Para a realização desta pesquisa qualitativa contou-se com a participação de catorze contadores que trabalham ou trabalharam nestas organizações. A coleta de dados ocorreu por meio de entrevista semiestruturada. A apresentação dos resultados foi organizada em 20 categorias iniciais, que deram origem a 7 intermediárias e 3 categorias finais de análise. Elas dizem respeito às expectativas e idealizações no início da carreira, à experiência vivenciada na Big e às mudanças de perspectivas pessoais e profissionais impactando nas decisões de carreira dos entrevistados. Esta dissertação possibilitou perceber, pela visão dos contadores entrevistados, que a experiência nestas empresas gera influências significativas, que poderiam ser considerados legados, tanto profissionais como pessoais para os indivíduos, devido ao dinamismo, definido por eles como diferenciado, a que essas pessoas ficaram sujeitas. Além disso, verificou-se que para quem decide sair dessas instituições, há uma alta empregabilidade no mercado de trabalho e, para os que decidem permanecer, há a possibilidade de se tornar sócio, dependendo das suas escolhas e direcionamentos das trajetórias de carreira, que são baseadas nos gostos e preferências pessoais, mas também influenciada pelo meio social no qual essas pessoas estão inseridas. Mostrou-se forte, nesta pesquisa, a influência da família para o direcionamento das escolhas e da constituição das trajetórias profissionais. Revelaram-se experiências nas Bigs enquanto carreiras organizacionais, hierarquizadas, em um ambiente com altas demandas de trabalho e priorização da carreira em detrimento à vida pessoal; entretanto, ao longo do tempo as mudanças de vida que ocorreram, demandaram, em determinado momento, um maior equilíbrio entre vida pessoal e profissional, que foi o maior direcionador das escolhas das novas trajetórias. O dilema das auditoras e o interesse pela docência, que a maioria dos entrevistados demonstrou, também são resultados desta pesquisa. / This study analyzed how the experience in one of the largest audit firms (Big Four) influenced the construction of the Accountant career trajectories while auditor or consultant. For the realization of this qualitative research was counted with the participation of fourteen accountants who work or have worked in these organizations. The data were collected through semi-structured interview. The presentation of the results was organized in 20 initial categories, which gave rise to 7 intermediate and final 3 categories of analysis. They relate to expectations and idealizations early in his career, to the experience of the Big and changes of personal and professional perspectives impacting on the respondents career decisions. This work made it possible to realize, by the interviewees counters that the experience these companies generate significant influences, which could be considered legacy, both professional and personal to individuals, due to the dynamics defined by them as differentiated, that these people were subject. Moreover, it was found that for those who decide to leave these institutions, there is a high employability in the labor market and for those who decide to stay, there is the possibility of becoming a partner, depending on your choices and directions of career paths that they are based on personal tastes and preferences, but also influenced by the social environment in which these people are located. Proved to be strong in this research, the family influence on the direction of the choices and the establishment of professional trajectories. They have proven experience in the Bigs as organizational, hierarchical careers in an environment with high job demands and prioritizing career over personal life; however, over time the life changes that occurred, demanded at any given time, a better balance between personal and professional life, which was the biggest driver of the choices of new paths. The dilemma of auditing and interest in teaching, most of them show, are also results of this research.

by Chiu, Kit Chau. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2005. / Includes bibliographical references (leaves 90-92). / Abstracts in English and Chinese. / ABSTRACT --- p.02 / 摘要 --- p.04 / ACKNOWLEDGEMENTS --- p.06 / TABLE OF CONTENTS --- p.07 / LIST OF FIGURES --- p.10 / LIST OF TABLES --- p.12 / Chapter 1 --- INTRODUCTION --- p.13 / Chapter 1.1 --- Application with formation flying --- p.14 / Chapter 1.2 --- Previous work --- p.16 / Chapter 1.3 --- The present work --- p.18 / Chapter 1.4 --- Thesis outline --- p.19 / Chapter 2 --- OPTIMIZATION IN DESIRED TRAJECTORY --- p.21 / Chapter 2.1 --- Problem formulation --- p.21 / Chapter 2.1.1 --- System model --- p.21 / Chapter 2.1.2 --- System constraints --- p.22 / Chapter 2.1.3 --- Cost function of the system --- p.23 / Chapter 2.2 --- Reformation as optimal control problem --- p.23 / Chapter 2.2.1 --- Polynomial form for input --- p.24 / Chapter 2.2.2 --- Problem simplification --- p.26 / Chapter 2.3 --- Numerical case studies --- p.27 / Chapter 2.3.1 --- Case study 2-1: Equal weightings in all units and directions --- p.27 / Chapter 2.3.2 --- Case study 2-2: Equal weightings in all directions but different weightings in control units --- p.30 / Chapter 2.3.3 --- Case 2-3: Different weightings in x-y-z directions but equal weightings in all control units --- p.33 / Chapter 2.4 --- Chapter summary --- p.35 / Chapter 3 --- OBSTACLE AVOIDANCE --- p.36 / Chapter 3.1 --- Additions of obstacle constraints --- p.36 / Chapter 3.2 --- Simulation case studies --- p.37 / Chapter 3.2.1 --- Case study 3-1: No obstacle --- p.38 / Chapter 3.2.2 --- Case study 3-2: Single obstacles --- p.40 / Chapter 3.2.3 --- Case study 3-3: Two obstacles --- p.42 / Chapter 3.2.4 --- Case study 3-4: Two obstacles and optimal velocity --- p.48 / Chapter 3.3 --- Chapter summary --- p.51 / Chapter 4 --- FUZZY INTERACTIVE FORCE BETWEEN ELEMENTS --- p.52 / Chapter 4.1 --- Region of repulsive force --- p.52 / Chapter 4.2 --- Region of attractive force --- p.53 / Chapter 4.3 --- Beyond the attractive region --- p.53 / Chapter 4.4 --- Interactive force as function of separation --- p.54 / Chapter 4.5 --- Fuzzy mapping --- p.55 / Chapter 4.6 --- Chapter summary --- p.58 / Chapter 5 --- VIRTUAL LEADER --- p.59 / Chapter 5.1 --- Virtual leader --- p.59 / Chapter 5.2 --- Two maneuverable elements and two virtual leaders --- p.60 / Chapter 5.3 --- Rotational Trajectories for the two virtual leaders --- p.61 / Chapter 5.4 --- Chapter summary --- p.65 / Chapter 6 --- OPIMIZATION BY INTERACTIVE FORCE --- p.66 / Chapter 6.1 --- Narrow channel passage --- p.66 / Chapter 6.2 --- Interactive forces --- p.68 / Chapter 6.3 --- Definition of interactive force --- p.69 / Chapter 6.4 --- Formulation as optimization problem --- p.71 / Chapter 6.4.1 --- Parameterization of f1 and f2 --- p.71 / Chapter 6.4.2 --- Reformulated optimization problem --- p.73 / Chapter 6.5 --- Simulation results --- p.74 / Chapter 6.6 --- Chapter summary --- p.77 / Chapter 7 --- MODIFICATION IN OBSTACLE --- p.78 / Chapter 7.1 --- Modification for interactive force --- p.78 / Chapter 7.2 --- Modification in obstacle description --- p.79 / Chapter 7.3 --- """Shortest distance"" between control unit and obstacle" --- p.80 / Chapter 7.4 --- Simulation case studies --- p.81 / Chapter 7.4.1 --- Case study 7-1: Single triangular obstacle --- p.81 / Chapter 7.4.2 --- Case study 7-2: Two triangular obstacles --- p.83 / Chapter 7.5 --- Chapter summary --- p.85 / Chapter 8 --- Conclusions and future works --- p.86 / Chapter 8.1 --- Conclusions --- p.86 / Chapter 8.2 --- Future works --- p.88 / Chapter 8.2.1 --- Fuzzy mapping --- p.88 / Chapter 8.2.2 --- Intrinsic parameters and properties --- p.89 / BIBLIOGRAPHY --- p.90

CoordenaÃÃo de AperfeÃoamento de Pessoal de NÃvel Superior / This work proposes a study and application of advanced controller to trajectory tracking of wheeled mobile robots. This kind of problem is a challenger for controllers once its models has two inputs and three outputs and is a non-linear model. In the literature there are various solutions to wheeled mobile robots trajectory tracking, among them the Model Predictive Control (MPC) with linearization model and a non linear control which in this work will be nominated as Klancar Controller. The Predictive Controllers can be applied efficiently in plants which has multiple inputs an multiple outputs, in situation that a future reference trajectory is known and systems with input and output constraints . However, the main disadvantage of MPC is the high computational effort which limits its practical application. Thus, this specific controller uses the plants linearization model. On the other hand, the Klancar Controller may be more efficient than the ones based on linear models, once the model is non linear. However, its solution, by definition, does not match the optimized criteria which can be a disadvantage mainly in systems that has constrains and a known future reference. Furthermore, this work proposes the application of the Predictive Control Extended Prediction Self Adaptive Control (EPSAC) to wheeled mobile robot trajectory tracking. This control strategy uses explicitly the non linear robot model, future reference, constraints on the variables and has a optimized solution. And, to the matter of this work, it has not been found reports of the EPSAC applied in mobile robotics, and is thus an unprecedented application. Simulation results are presented comparing the controllers studied using performance indices. Else, the controllers were applied in a mobile robot. / Este trabalho propÃe o estudo e aplicaÃÃo de controladores avanÃados ao seguimento de trajetÃrias de robÃs mÃveis com rodas. Este tipo de problema à bastante desafiador do ponto de vista de controle uma vez que o modelo tem duas entradas e trÃs saÃdas, alÃm disso, trata-se de um modelo nÃo linear. Na literatura existem diversas soluÃÃes para o controle de trajetÃria de robÃs mÃveis, dentre eles tem-se o Controle Preditivo Baseado em Modelo (MPC) por meio de modelos linearizados e um controlador nÃo linear denominado neste trabalho de controlador de Klancar. Os controladores preditivos podem ser aplicados de forma eficiente em plantas com modelos multivariÃveis, em situaÃÃes na qual a trajetÃria futura de referÃncia à conhecida e em sistemas com restriÃÃes nas vaiÃveis de entrada e de saÃda. PorÃm, a principal desvantagem do MPC linearizado à o alto custo computacional o que limita as aplicaÃÃes prÃticas. AlÃm disso, esse controlador especÃfico utiliza um modelo linearizado da planta. Por outro lado, o controlador de Klancar pode ser mais eficiente que os baseados em modelos lineares, devido Ãs nÃo linearidades inerentes do modelo. No entanto, a sua soluÃÃo, por definiÃÃo, nÃo corresponde a critÃrios Ãtimos o que pode representar uma desvantagem principalmente em sistemas com restriÃÃes e referÃncia futura conhecida. AlÃm disso, neste trabalho à proposta a aplicaÃÃo do controle preditivo EPSAC (Extended Prediction Self Adaptive Control) para o controle de seguimento de trajetÃrias. Esta estratÃgia utiliza de forma explÃcita o modelo nÃo linear do robÃ, a referÃncia futura, as restriÃÃes nas variÃveis do robà e soluÃÃo corresponde a um critÃrio Ãtimo. Atà onde foi pesquisado pelo autor deste trabalho, nÃo existem relatos da utilizaÃÃo do EPSAC na robÃtica mÃvel, sendo desta forma uma aplicaÃÃo inÃdita. Resultados de simulaÃÃo sÃo apresentados comparando os controladores estudados, utilizando Ãndices de desempenhos. AlÃm disso, os mesmo foram implementados em um robà mÃvel.

Essa tese procura investigar os mistérios que envolvem a adesão ao metier da dança, atividade artística para a qual é atraída uma minoria que faz do corpo instrumento de trabalho e recurso privilegiado de transgressão das próprias condições de existência. Trata-se de um estudo sobre bailarinas e bailarinos profissionais cujo interesse reside no exame dos elementos objetivos e subjetivos de acesso e permanência nessa carreira. A idéia consiste em desvendar a vocação para a dança tomando como cenário analítico o contexto do meio coreográfico da cidade de São Paulo, na atualidade, em que são encontrados bailarinos de distintos perfis alinhados em diferentes modelos estéticos: de um lado, a produção contemporânea que tem como base os procedimentos do balé clássico e, de outro, as linguagens de vanguarda amparadas, sobretudo, nas técnicas de improvisação. De acordo com isso, o objetivo deste trabalho é compreender quem são aqueles que, do ponto de vista social, tornam-se bailarinos, suas razões e seus meios, e em que medida os capitais econômicos, simbólicos e corporais podem ser traduzidos no âmbito dos estilos aos quais essas trajetórias se dirigem. A tese teve como fundamentos de pesquisa a etnografia de duas companhias paulistanas uma tradicional e outra de vanguarda e um conjunto de entrevistas com bailarinas e bailarinos, a partir das quais foram geradas narrativas sobre os seus itinerários e um banco de dados morfológicos que permitiram a interpretação das trajetórias dos agentes desse meio. Ao abordar essa base de dupla perspectiva metodológica, o trabalho elabora a análise da modelagem corporal e do imaginário desses profissionais e dos estilos de vida que deles derivam. A trajetória social e a feição do corpo dos bailarinos, submetidas ao ângulo das subjetividades do sujeito e da construção da dimensão de seus sentidos, foram às principais referências utilizadas como fontes de dados para apreender as especificidades dos portadores que constituem o pequeno grupo que realiza o salto para essa profissão e passa a vivenciar a dança como um trabalho, na condução metódica da vida; e para examinar os fatores e as condições sociais que orientam a formação dessa vocação. / This thesis seeks to investigate the mysteries surrounding the access to the métier of dance, this artistic activity to which a minority is attracted, which makes the body a work instrument and a privileged transgression resource of their own living conditions. This is a study on professional dancers, both male and female, whose interest lies in examining the objective and subjective elements of access and permanence in this career. The idea is to unveil the \"vocation\" to dance considering as analytical scene the present choreographic context in the city of São Paulo, where dancers of distinct profiles are found lined up in different aesthetic models: on the one hand, the contemporary production that is based on the procedures of classical ballet and, on the other, the vanguard languages especially supported by improvisational techniques. Accordingly, the objective of this work is to understand, from a social standpoint, who are those that become dancers, their reasons and their means and to what extent the economic, symbolic and body capitals can be translated within the styles in which those paths are conducted. The thesis had as a research basis the ethnography of two dance companies from São Paulo a traditional and a vanguardist one as well as a series of interviews with dancers, from which both narratives about their itineraries and a morphological database were generated, allowing the interpretation of the trajectories of the agents in this environment. In addressing the basis of this dual methodological perspective, the work elaborates the analysis of body sculpting, these professionals imaginary and the lifestyles that derive from it. The social trajectory and the shape of the dancers bodies, submitted to the angle of the subjectivity of the subject and the construction of the size of their senses, were the main references used as data base to capture the specificities of holders who constitute the small group that leaps into this profession and starts to experience dance as a work, as a methodic way of life, and to examine the factors and social conditions underlying the formation of this vocation