El presente trabajo de investigación se realizó con el objetivo de mejorar el proceso comercial de la empresa ABC S.A.C., con el fin de que las soluciones propuestas ayuden a la empresa a mejorar su rentabilidad. / This investigation Project was made in order to improve the commercial process of the company ABC S.A.C., with the objective that the proposed solutions help the Company to improve its profitability. / Trabajo de investigación

Dans le contexte actuel marqué par l’instabilité des marchés, les clients sont de plus en plus exigeants. un client qui n’est pas approvisionné à une date souhaitée peut soit remettre son achat à plus tard, soit aller chercher le produit chez un concurrent. de plus, l’entreprise doit faire face à de multiples imprévisibilités internes, de la concurrence ou d’événements extérieurs. ces aléas induisent de l'incertitude dans la planification de la production et génèrent des sources nombreuses de retard, de désynchronisation et de pertes de productivité. ce travail de thèse s’intègre dans la problématique de la planification de la production dans un environnement incertain. nous étudions des problèmes de la planification des réapprovisionnements pour un système d’assemblage à plusieurs niveaux, quand les délais d’approvisionnement sont incertains. nous avons choisi comme indicateur de performance l’espérance du coût total moyen qui est égal à la somme du coût de stockage des composants, le coût de rupture du produit fini et le coût de stockage du produit fini. des propriétés théoriques, des modèles analytiques ainsi que des méthodes d’optimisation ont été proposés. nous avons montré que la résolution du problème ne dépend pas seulement de la méthode de résolution et du nombre de niveaux, mais aussi du coût de rupture en produit fini et de la structure du système d’assemblage. / In the current industrial context, the offer is largely higher than the demand. Therefore, the customers are more and more exigent. To distance themselves, companies need to offer to their customers the best quality products, the best costs, and with controlled lead times as short as possible. Last years, the struggle for reducing costs was accentuated within companies. However, stocks represent an important financial asset, and therefore, it is essential to control them. In addition, a bad management of stocks led either to delays in delivery, which generate additional production costs, either to the unnecessary inventory. The latter one can occur at different levels (from components at the last level to finished product), it costs money and immobilize funds. That is why, planners have to look for efficient methods of production and supply planning, to know exactly for each component, and when to order and in which quantity.The aim of this doctoral thesis is to investigate the supply planning in an uncertain environment. We are interested in a replenishment planning for multi-level assembly systems under a fixed demand and uncertainty of components lead times.We consider that each component has a fixed unit inventory cost; the finished product has an inventory cost and a backlogging cost per unit of time. Then, a general mathematical model for replenishment planning of multi-level assembly systems, genetic algorithm and branch and bound method are presented to calculate and to optimize the expected value of the total cost which equals to the sum of the inventory holding costs for the components, the backlogging and the inventory holding costs for the finished product. We can state by the different results that the convergence of the GA doesn't depend only on the number of components in the last level but also on the number of levels, the type of the BOM and the backlogging cost for the finished product.

Orientador: Hugo Enrique Hernandez Figueroa / Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação / Made available in DSpace on 2018-08-14T12:30:52Z (GMT). No. of bitstreams: 1 Paixao_OswaldoPedreira_D.pdf: 3002384 bytes, checksum: f5a0e8e8022dabd36cfce9ffdb839f9b (MD5) Previous issue date: 2009 / Resumo: Este trabalho, tem como objetivo o desenvolvimento de novas técnicas, para análise de regime permanente não-autonoma de circuitos de alta-velocidade não-lineares em grande-escala. Para tal, é proposto um novo método do balanço harmônico (BH) fundamentado em uma eficiente metodologia de decomposição multi-níveis, que subdivide um circuito não-linear em grande escala em uma estrutura hierarquica de super-redes (SuRs) esparsamente interconectadas. Mais precisamente, em cada nível de hierarquia, o circuito é composto por SuRs intermediárias, SuRs de fundo, e redes de conexão (RCs). As SuRs de fundo são decompostas em um aglomerado de subredes não-lineares (SRNs) correspondendo a dispositivos semicondutores, que por sua vez, estão envolvidos por uma sub-rede linear (SRL). A equação de estado e de sonda das SuRs de fundo foram obtidas utilizando uma nova metodologia que combina a formulação de espaço de estado (FEE) para as SRNs com a formulação nodal modificada (FNM) para a SRL. Esta metodologia FEE/FNM produz um sistema quadrado de equações com menor tamanho possível. Para realização das conversões do sinal entre os domínios do tempo e da frequência, foram discutidas e implementadas diferentes transformadas de Fourier discreta (TFDs), para operação em regime multi-tons, incluindo sinais com modulação digital. A equação determinante do BH multi-níveis do circuito assume uma estrutura hierarquica do tipo bloco diagonal com borda , que pode ser eficientemente resolvida utilizando técnicas de processamento paralelo. A matriz jacobiana de cada SuR de fundo é processada utilizando eficientes técnicas de matrizes esparsas, junto com o conceito de espectro de derivada. Para a solução da equação determinante, foram utilizados os métodos de Newton e do tensor para problemas de pequena- e média-escala, e os métodos de Newton inexato e do tensor inexato para problemas em grande-escala. A globalização via pesquisa-em-linha com retrocedimento, foi adotada para nestes solucionadores não-lineares. Entretanto, para o método do tensor e do tensor inexato, também foi adotada a técnica de pesquisa-em-linha curvilinear. Nos métodos inexatos, técnicas de pré-condicionamento foram utilizadas, para aumentar a eficiência e a robustez do solucionador linear iterativo em subespaço de Krylov (GMRES, GMRES-Bt e TGMRES-Bt). Finalmente, a formulação proposta foi validada e a eficiência do método do tensor e do tensor inexato comparada com o método de Newton e de Newton inexato, para diferentes topologias de circuitos utilizando diodos, FETs e HBTs, e operando sob diferentes regimes de excitação multi-tons. / Abstract: This work deals with the development of new techniques for nonautonomous nonlinear steady-state analysis of high-speed large-scale integrated circuits. To this end, it is proposed a novel harmonic balance (HB) method fundamented on a efficient multi-level decomposition methodology, that divides a large-scale circuit into hierarchical structure of sparsely interconnected supernetworks (SuNs). More precisely, the circuit is composed by intermediary SuRs, bottom SuRs and connection networks (CNs). The bottom SuNs are decomposed into a cluster of nonlinear subnetworks (NSNs) corresponding to the opto-electronic semiconductor devices, which in turn, are embedded by a linear subnetwork (LSN). Multi-port elements can be included in the LSN, in order to use measured data or results from electromagnetic analysis of structures with complex geometries. The formulation of the bottom SuN state and probe equations uses an improved table-oriented statespace formulation (SSF), that produces a square system with the lowest possible size, which is equal to the number of nonlinear state-variables (branch voltages and currents) that act as argument of the fuctions representing the semiconductor devices nonlinearities. The SSF is compared with the classical modified nodal formulation (MNF). For dealing with signal timefrequency conversions, discrete Fourier transform (DFT) techniques for different multi-tone regimes are discussed, including complex digitally modulated signals. The multi-level HB determining equation of the circuit assumes a hierarchical block bordered structure that can be efficiently tackled by parallel processing techniques. The HB jacobian matrix is handled using efficient sparse matrix techniques with a proper definition of the derivatives spectra. For the solution of a large-size HB problem, we investigated the applications of inexact tensor method based on Krylov-subspace techniques. Preconditioning are used to improve the robustness of the iterative tensor solver. To determine the circuit DC regime, we employ the tensor method. We adopted the backtracking linesearch technique as a globalisation strategy. However, for the tensor method, in particular, a curvilinear linesearch was also implemented. Finally, the formulation was validated and, the tensor and inexact tensor method efficiency was compared with the Newton and inexact Newton method, respectively, for several different circuits using diodos, FETs and HBTs, and operating under different multi-tone regimes. / Doutorado / Engenharia de Telecomunicações / Doutor em Engenharia Elétrica

Este trabalho apresenta a aplicação de uma metodologia para estudos de postos de trabalho com o objetivo de reduzir desperdícios, aplicar melhorias de layout e consequentemente melhora da ergonomia de um posto de trabalho de uma indústria do ramo automotivo, visando o diagnóstico do processo em questão, encontrando assim, oportunidades para melhoria do mesmo. Para realizar este diagnóstico e identificar as melhorias pretendidas foi utilizada a ferramenta de análise de tempo MTM (Methods-Time Measurement), técnicas de balanceamento, ergonomia e estudo de layout. Atualmente há muitas empresas no mundo que utilizam o MTM (Methods-Time Measurement), que é um sistema de tempos pré-determinados. A eliminação dos desperdícios com a finalidade da redução de tempo é necessária para o aumento da produção que será aplicado em 2012, que tem como objetivo a passagem de 29 veículos por hora para 40 veículos por hora na linha de montagem. Para o estudo de caso, foram selecionados três postos, os quais são nomeados segundo suas operações principais. O primeiro deles, Filme CAPOT, compreende a colocação de filme protetor sobre o capot do veículo na saída da linha de montagem. O segundo, Filme TETO, corresponde à colocação do mesmo filme sobre o teto do veículo. Já o Posto ECOM é onde ocorre a liberação do veículo para comercialização. Utilizando a análise de posto com as ferramentas já listadas, foi possível diminuir o tempo necessário ao operador para que mesmo realize suas atividades e assim aumentar a capacidade produtiva da empresa em 48,9%, ou seja, passa-se de 31,1 para 46,3 veículos por hora. A ergonomia do espaço de trabalho teve sua avaliação global modificada nos postos de colocação de filme de proteção no CAPOT e TETO em função da modificação do layout dos postos propiciando aos operadores menores deslocamentos e posturas de trabalho mais ergonômicas que estão abordadas no corpo do trabalho. Temse também o ganho relacionado ao espaço físico, os três postos utilizavam, juntos, 300,9m do prédio da empresa já na situação proposta necessita-se apenas de 142,6m, uma redução de 52,6%. / This paper presents the application of a methodology for studies of work stations in order to reduce waste, implement improvements to layout and consequently improves the ergonomics of a work station at automotive industry, for the diagnosis of the case in question, finding opportunities for improvement. To make this diagnosis and identify the intended improvements was used a toll for analysis of time called MTM (Methods-Time Measurement), balancing techniques, ergonomics and layout study. Currently there are many companies worldwide that use MTM (Methods-Time Measurement), which is a system of predetermined times. The elimination of waste for the purpose of reducing the time is required for the increased production to be applied in 2012, which intends the passage of 29 vehicles per hour for 40 vehicles per hour on the assembly line. For the case study, we selected three stations, which are named according to their main operations. The first, Filme CAPOT, comprising placing protective film on the top of the vehicle off the assembly line. The second Filme TETO corresponds to placing the same film on the ceiling of the vehicle. Finally the station ECOM is where occurs the release of the vehicle for sale. Using the work station analysis with the tools already listed, it was possible to reduce the time required for the operator to perform the same activities and increase the companys production capacity in 48.9%, from 31.1 to 46.3 vehicles per hour. The ergonomics of the workspace had his overall evaluation changed at the placing protective film on CAPOT and TETO stations, because the modifying the layout of the stations enabling operators to smaller displacements and more ergonomic working postures that are addressed in the body of the work. There is also the gain related to the physical space, the three stations used together 300.9 m of the companys building, and after proposed situation they needs only 142.6 m, a decrease of 52.6%.

A presente dissertação objetiva compartilhar a análise das produções de cuidado de si com professoras em uma escola pública da rede estadual de educação, localizada no município de Porto Alegre/RS. O estudo contou com a realização de cinco encontros no formato oficina que privilegiaram um espaço para problematização e vivência do cuidado de si com as participantes. A pesquisa-intervenção e a cartografia constituíram-se como dois importantes referenciais teórico-metodológicos, em conjunto com a Análise Institucional. Foram utilizados diários de campo para o registro das observações, afectos e experiências engendradas no campo de intervenção. Como parte do processo, realizou-se a restituição do material às professoras, com o intuito de discutir alguns aspectos que poderiam estar cristalizando as práticas na escola. O cuidado de si foi pensado de forma a possibilitar encontros coletivos e o compartilhamento de experiências, utilizando recursos como a escrita, a memória, a imagem, a música e o cinema. A oficina pensada como um dispositivo associa a produção do cuidado de si em meio às linhas estéticas, políticas e jurídicas normativas, as quais se entrecruzam e agem sobre a constituição de si. Os encontros também colocaram em cena as relações de gênero, os tempos, espaços e corpos escolares. Essa proposta coletiviza a produção do cuidado de si e questiona o atual modo de subjetivação neoliberal que tem afirmado uma visão individualista de mundo. Ainda, as políticas públicas, regidas por essa doutrina, têm preparado a inserção em massa dos estudantes no mundo do trabalho e mantido a escola como um espaço voltado para o trabalho e a máxima eficiência, apartando a dimensão do desejo. Torna-se urgente repensar o atual modelo de educação posto no Brasil, assim como a construção de espaços para a criação de estratégias de trabalho docente e problematização das práticas. Dessa forma, espera-se contribuir para a produção de subjetividades mais criativas e menos atreladas às durezas da maquinaria escolar. / This dissertation aims to share the analysis of self care productions with teachers in a public school of the state education network, located in the city of Porto Alegre/RS. The study included the realization of five meetings in the format workshop that privileged a space for problematization and experience of self care with the participants. The intervention research and mapping were constituted as two important theoretical and methodological frameworks, in conjunction with the Institutional Analysis. Field diaries were used to record the observations, affections and experiences engendered in the intervention field. As part of the process, the material was returned to the teachers, with the intention of discussing some aspects that could be crystallizing practices in the school. Self care has been thought in order to enable collective meetings and sharing of experiences, using resources such as writing, memory, image, music and cinema. The workshop thought as a device associates the production of self care with the aesthetic, scientific, political and legal normative lines, which intersect and act on the constitution of self. The meetings also put in scene gender relations, times, spaces and school bodies. This proposal collectivizes the production of self care and questions the current mode of neoliberal subjectivation that has affirmed an individualistic view of the world. Still, public policy, governed by this doctrine, have prepared the mass integration of students into the labor market and maintained the school as a space facing the work and maximum efficiency, separating the dimension of desire. It is urgent to rethink the current education model in Brazil, as well as the construction of spaces for the creation of teaching strategies and questioning practices. Thus, it is expected to contribute to the production of more creative subjectivities and less tied to the hardships of school machinery.

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Bakgrund: Psykisk ohälsa ökar bland barn och unga, medan väntetiderna på många enheter blir längre och längre. Psykisk ohälsa kan påverka barn och ungas välbefinnande samt hela barnets familj. Grundläggande omvårdnadsbehov kan bli lidande. Det satsas stora pengar inom området, men förändringarna har hittills uteblivit. Kan tidig intervention påverka barns psykiska ohälsa och därmed ge evidens för allvaret med de långa vårdköerna? Syfte: Att undersöka faktorer och dess påverkan på barn och unga samt deras föräldrar i samband med långa väntetider inom barn och ungdomspsykiatrin. Metod: Studien genomfördes genom en litteraturöversikt baserad på 15 vetenskapliga artiklar med båda kvalitativ och kvantitativ metod. Sökningarna genomfördes i databaserna Cinahl, PubMed och PsycINFO. Resultat: Resultat visar flera fördelar med tidig intervention i behandlingsresultatet av psykisk ohälsa hos barn och unga såsom minskad ångest/oro och depressiva symtom. Dessa fördelar har även visat sig hålla sig kvar under en längre tid efter avslutad behandling. Resultatet visar även på att väntetiderna har en betydande påverkan på föräldrarna till barn och unga med psykisk ohälsa. I resultatet framkommer det att korta behandlingstider med tidig intervention ger ett förbättrat mående.  Slutsats: Psykisk ohälsa innebär en utmaning för barn och unga. Det finns stora brister inom barn och ungdomspsykiatrin. Barn och ungas psykiska hälsa måste börja tas på allvar. Barn och unga är landets framtid och bygger en grund för en vidare fungerande samhällsstruktur. Barn och ungdomspsykiatrin är en viktig enhet för främjandet, utvecklandet och bibehållandet av barn och ungas psykiska hälsa. / Background: Mental illness increases among young people, while waiting times for treatments are getting longer. Mental illness can affect the well-being of young people and their family. Basic nursing needs can be suffering. The government is investing money, but so far has no changes been seen. Can early intervention affect children’s mental health and provide evidence for the seriousness with the long care queues? Aim: To investigate factors and their effect on children and adolescents and their parents in connection with long waiting times in child and adolescent psychiatry. Method: A literature review based on 15 scientific articles with qualitative and quantitative methods. The searches were performed in the databases Cinahl, PubMed and PsycINFO. Result: The results shows benefits of early intervention in the treatment outcome of mental illness in children and adolescents such as reduced anxiety and depressive symptoms. These benefits have also been shown to persist for an extended period after completion of treatment. Waiting times has a significant impact on the parents of children with mental illness. Short treatment times with early intervention in mental illness in children and adolescents provides an improved feeling. Conclusion: Mental illness is a challenge for young people. There are shortcomings in treatment for mental illnesses. Mental health of children and adolescents must begin to be taken seriously. Young people is the future of the country and build a foundation for a further functioning society. Psychiatry is an important unit for development and maintenance of young people’s mental health.

Ce document rassemble les travaux effectués durant mes années de thèse. Je commence par une présentation concise des résultats principaux, puis viennent trois parties relativement indépendantes.Dans la première partie, je considère des problèmes d'inférence statistique sur un échantillon i.i.d. issu d'une loi inconnue à support dénombrable. Le premier chapitre est consacré aux propriétés de concentration du profil de l'échantillon et de la masse manquante. Il s'agit d'un travail commun avec Stéphane Boucheron et Mesrob Ohannessian. Après avoir obtenu des bornes sur les variances, nous établissons des inégalités de concentration de type Bernstein, et exhibons un vaste domaine de lois pour lesquelles le facteur de variance dans ces inégalités est tendu. Le deuxième chapitre présente un travail en cours avec Stéphane Boucheron et Elisabeth Gassiat, concernant le problème de la compression universelle adaptative d'un tel échantillon. Nous établissons des bornes sur la redondance minimax des classes enveloppes, et construisons un code quasi-adaptatif sur la collection des classes définies par une enveloppe à variation régulière. Dans la deuxième partie, je m'intéresse à des marches aléatoires sur des graphes aléatoires à degrés precrits. Je présente d'abord un résultat obtenu avec Justin Salez, établissant le phénomène de cutoff pour la marche sans rebroussement. Sous certaines hypothèses sur les degrés, nous déterminons précisément le temps de mélange, la fenêtre du cutoff, et montrons que le profil de la distance à l'équilibre converge vers la fonction de queue gaussienne. Puis je m'intéresse à la comparaison des temps de mélange de la marche simple et de la marche sans rebroussement. Enfin, la troisième partie est consacrée aux propriétés de concentration de tirages pondérés sans remise et correspond à un travail commun avec Yuval Peres et Justin Salez. / This document presents the problems I have been interested in during my PhD thesis. I begin with a concise presentation of the main results, followed by three relatively independent parts. In the first part, I consider statistical inference problems on an i.i.d. sample from an unknown distribution over a countable alphabet. The first chapter is devoted to the concentration properties of the sample's profile and of the missing mass. This is a joint work with Stéphane Boucheron and Mesrob Ohannessian. After obtaining bounds on variances, we establish Bernstein-type concentration inequalities and exhibit a vast domain of sampling distributions for which the variance factor in these inequalities is tight. The second chapter presents a work in progress with Stéphane Boucheron and Elisabeth Gassiat, on the problem of universal adaptive compression over countable alphabets. We give bounds on the minimax redundancy of envelope classes, and construct a quasi-adaptive code on the collection of classes defined by a regularly varying envelope. In the second part, I consider random walks on random graphs with prescribed degrees. I first present a result obtained with Justin Salez, establishing the cutoff phenomenon for non-backtracking random walks. Under certain degree assumptions, we precisely determine the mixing time, the cutoff window, and show that the profile of the distance to equilibrium converges to the Gaussian tail function. Then I consider the problem of comparing the mixing times of the simple and non-backtracking random walks. The third part is devoted to the concentration properties of weighted sampling without replacement and corresponds to a joint work with Yuval Peres and Justin Salez.

Nous sommes intéressé par la reconstitution et la prédiction des séries temporelles multivariées à partir des données partiellement observées et/ou agrégées.La motivation du problème vient des applications dans la gestion du réseau électrique.Nous envisageons des outils capables de résoudre le problème d'estimation de plusieurs domaines.Après investiguer le krigeage, qui est une méthode de la litérature de la statistique spatio-temporelle, et une méthode hybride basée sur le clustering des individus, nous proposons un cadre général de reconstitution et de prédiction basé sur la factorisation de matrice nonnégative.Ce cadre prend en compte de manière intrinsèque la corrélation entre les séries temporelles pour réduire drastiquement la dimension de l'espace de paramètres.Une fois que le problématique est formalisé dans ce cadre, nous proposons deux extensions par rapport à l'approche standard.La première extension prend en compte l'autocorrélation temporelle des individus.Cette information supplémentaire permet d'améliorer la précision de la reconstitution.La deuxième extension ajoute une composante de régression dans la factorisation de matrice nonnégative.Celle-ci nous permet d'utiliser dans l'estimation du modèle des variables exogènes liées avec la consommation électrique, ainsi de produire des facteurs plus interprétatbles, et aussi améliorer la reconstitution.De plus, cette méthod nous donne la possibilité d'utiliser la factorisation de matrice nonnégative pour produire des prédictions.Sur le côté théorique, nous nous intéressons à l'identifiabilité du modèle, ainsi qu'à la propriété de la convergence des algorithmes que nous proposons.La performance des méthodes proposées en reconstitution et en prédiction est testé sur plusieurs jeux de données de consommation électrique à niveaux d'agrégation différents. / We are interested in the recovery and prediction of multiple time series from partially observed and/or aggregate data.Motivated by applications in electricity network management, we investigate tools from multiple fields that are able to deal with such data issues.After examining kriging from spatio-temporal statistics and a hybrid method based on the clustering of individuals, we propose a general framework based on nonnegative matrix factorization.This frameworks takes advantage of the intrisic correlation between the multivariate time series to greatly reduce the dimension of the parameter space.Once the estimation problem is formalized in the nonnegative matrix factorization framework, two extensions are proposed to improve the standard approach.The first extension takes into account the individual temporal autocorrelation of each of the time series.This increases the precision of the time series recovery.The second extension adds a regression layer into nonnegative matrix factorization.This allows exogenous variables that are known to be linked with electricity consumption to be used in estimation, hence makes the factors obtained by the method to be more interpretable, and also increases the recovery precision.Moreover, this method makes the method applicable to prediction.We produce a theoretical analysis on the framework which concerns the identifiability of the model and the convergence of the algorithms that are proposed.The performance of proposed methods to recover and forecast time series is tested on several multivariate electricity consumption datasets at different aggregation level.

Der Zweikampf als fester Bestandteil der mittelalterlichen wie auch frühneuzeitlichen Streitkultur ist ein überaus vielschichtiges, dynamisches und prinzipiell mehrdeutiges Phänomen, das sich den kategorialen Bändigungsversuchen der Rechtsgeschichte ebenso entzieht wie linearen Entwicklungsnarrativen. Aufgrund der typologischen Bandbreite – Entscheidungszweikampf, als Gottesurteil verstandenes Beweismittel, gerichtlich kontrolliertes Fechten um Ehrangelegenheiten, das neuzeitliche Duell als historischer Fluchtpunkt – und der Pluralität von Praktiken und Sinnzuschreibungen verbietet sich ein einseitiger Rekurs auf normative Quellen und rechtshistorische Ansätze gleichsam von selbst. Vielmehr scheint sich, überblickt man die Forschungsleistungen der letzten Jahre, eine Erweiterung der Perspektive unter Rückgriff auf sozial- und kulturgeschichtliche Methoden, Erkenntnisinteressen und Quellenspektren durchzusetzen.