Dans un contexte du développement durable, de nouvelles architectures macromoléculaires biosourcées ont été synthétisées à partir de synthons (diacides et diols) pouvant être obtenus par voies fermentaires à partir de sources carbonées issues de la biomasse. Dans un premier temps, différents copolyesters aliphatiques ont été synthétisés en masse, à l’aide d’un catalyseur organométallique à base de titane, à partir de diacides (acides succinique et adipique) et de diols (1,3-propanediol, 1,4-butanediol et 2,3-butanediol) courts. Dans un deuxième temps, des architectures macromoléculaires similaires ont été obtenues par catalyse enzymatique en solution à l’aide de la lipase B de Candida antarctica. L’influence de la longueur et de la structure des monomères sur leur réactivité en présence de la lipase a été particulièrement étudiée. Dans un troisième et dernier temps, des architectures macromoléculaires à base d’oligomères hydroxytéléchéliques d’un polyester bactérien : le poly((R)-3-hydroxybutyrate) (PHB)tels que des poly(ester-éther-uréthane)s et des copolyesters ont été obtenues soit par couplage de chaîne à l’aide d’un diisocyanate, ou par transestérification organométallique et enzymatique. Ces études ont permis d’analyser en détail l’effet de l’addition des synthons biosourcés dans les architectures macromoléculaires et notamment sur la structure cristalline, la stabilité thermique et les propriétés thermiques et optiques de ces polymères. De plus, le grand potentiel de la catalyse enzymatique pour la synthèse de polyesters et celui de l’utilisation d’oligomères de PHB pour l’élaboration de nouveaux matériaux performants ont pu être largement démontrés. / In the context of sustainable development, new biobased and aliphatic macromolecular architectures were synthesized from building blocks that can be obtained by fermentation routes using carbon sources from the biomass. First, several aliphatic copolyesters were synthesized in bulk from short dicarboxylic acids (such as succinic and adipic acids) and diols (such as 1,3-propanediol, 1,4-butanediol and 2,3-butanediol) by organometallic catalysis using an effective titanium-based catalyst. In a second time, similar macromolecular architectures were synthesized by an enzymatic process in solution using Candida antarctica lipase B as catalyst. The influence of the alkyl chain length and the structure of monomers on their reactivity toward the lipase were particularly discussed. In the third and last part, new macromolecular architectures based on hydroxytelechelic oligomers of a bacterial polyester: poly((R)-3-hydroxybutyrate) (PHB), such as poly(ester-ether-urethane)s and copolyesters, were obtained by either chain-coupling using a diisocyanate, or organometallic and enzymatic transesterification, respectively.These studies permitted to determine a close relationship between the effect of the building blocks structure integrated in the final macromolecular architectures and the intrinsic properties, such as the crystalline structure, the thermal stability and the thermal and optical properties, of these polymers. In addition, the great potential of the lipase-catalyzed synthesis of polyesters and the use of PHB oligomers for developing new high performance materials has been clearly established.

Made available in DSpace on 2010-04-20T20:20:12Z (GMT). No. of bitstreams: 0 Previous issue date: 1999-04-20T00:00:00Z / Trata das dificuldades e desafios encontrados durante as implementações do SAP R/3. Resulta de entrevistas realizadas pelo autor durante 3 anos de acompanhamento de implementações em empresas no Brasil e nos Estados Unidos. Identifica razões do fracasso e faz recomendações para se evitar problemas durante a implementação do- SAP R/3 nas empresas

The gas and electricity supplier company has decided to improve their business processes by implementing the SAP CRM system. This master's thesis covers design and implementation of a communication layer in the IDE module of the SAP IS-U backend system for the purpose of integrating existing solution of particular business processes into the new SAP CRM frontend system.

Cette thèse est consacrée à la définition d'une surface géométriquement lisse interpolant un ensemble triangulé de points de R^3. Une telle triangulation, que nous appelons "réseau surfacique", doit définir une sous-variété de dimension 2, et peut représenter des surfaces de n'importe quel genre topologique. Il fournit l'information topologique, par l'intermédiaire d'une structure de données contenant les informations d'adjacence entre les sommets, les arêtes et les faces. Nous avons développé deux méthodes pour l'interpolation des sommets du réseau surfacique. Elles sont strictement locales et produisent des surfaces polynomiales par morceaux de degré 5 et de continuité G^1. De nombreux paramètres libres sont disponibles et ajustés soit interactivement soit automatiquement afin de lisser la surface. Dans le contexte interactif, plusieurs outils de design sont développés, basés sur l'interprétation géométrique des paramètres libres. La forme voulue peut être obtenue par une modélisation temps réel, grâce à la localité des algorithmes. Dans le cas du design automatique, de nombreux algorithmes ont été developpés satisfaisant un certain nombre de caractéristiques de forme. Un grand nombre de règles heuristiques et d'optimisations locales sont utilisées pour définir les valeurs des paramètres de forme dans le but d'obtenir des formes satisfaisantes ainsi qu'un contrôle optimal de la surface.

<p>IT as an enabler, by obtaining benefits to an organization, was the coherent apprehension behind the purchase of the Enterprise Resource System R/3 by Ericsson in 1997. Public Networks, a 33.000 worker’s division at Ericsson, have had profitability problems during the recent years prior to the purchase. By integrating R/3 with an organizational change, the management aimed to obtain foreseen benefits, such as headcount reduction and shorter lead times.</p><p>This thesis shows in theory as in practice difficulties and obstacles in reaching and calculating benefits of IT. Through analyzing the system along with the business processes targeted by the integration project, a list of Key Performance Indicators was brought to the stakeholders of the organization. Through numerous interviews and meetings throughout the division the indicators were discussed, depicted and analyzed.</p><p>In a consensus driven organization as Public Networks, the integration project withholding the largest Enterprise Resource Planning systems had to work politically with communication to be able to gain approval for its benefits. In failing to win the process against different views and stakeholders, benefits was to be at risk and more importantly, later shown to be impossible to measure.</p>

Made available in DSpace on 2016-06-02T19:51:43Z (GMT). No. of bitstreams: 1 2979.pdf: 2470713 bytes, checksum: cb66cbd2392299db2bc5224246b85d95 (MD5) Previous issue date: 2010-03-05 / Many companies which adopted ERP systems in the past are frequently reluctant tostart new projects to upgrade the technology to newer versions. The decision is difficult due to thelong time of the project, the amount of financial investments and internal workforcerequired for the job, which are usually similar to the original ERP implementation. This work has asproposal a research and analisys of the apparently large demand of resources necessary to upgradethe versions of ERP R/3 systems. Firstly, a review in literature is made to present the arquitecture,characteristics and concepts of modules and funcionalities of these ERPs systems. It is alsoincluded the study of the life cicle of ERPs systems and its interfaces with legacy systems. Insequence, the versions upgrade subject is explored, where this author suggests that upgrade ofversions gives new life to ERPs systems and discuss how the suppliers share the ERP´s market andfinally explore the kinds of upgrades available for these systems. After these studies, twoquestionnaires are made to obtain data. This research is a Unique Case study type and has asobjective to describe the behavior of critic factors of implementation during an upgrade of ERPsystems, verifying if the demands are justified. / As empresas que necessitam fazer atualizações em seus sistemas ERP SAP R/3questionam os tempos, os valores e a utilização dos recursos humanos e estruturais solicitados parafazer estas atualizações. As demandas necessárias se aproximam aos de uma implementação. Estetrabalho tem como proposta a pesquisa e análise das dificuldades para atualizar as versões dosistema ERP R/3 da SAP. Inicialmente uma revisão bibliográfica é feita para dimensionar aabrangência dos sistemas ERPs e apresentar um referencial teórico de conceitos sobre os sistemas degestão empresarial; sobre a arquitetura e as características dos sistemas ERPs; sobre os conceitos demódulos e funcionalidades que estão diretamente relacionados a estes sistemas; sobre a evolução eciclo de vida destes sistemas; sobre a integração que estes sistemas têm com os sistemas legados. Nasequência é explorado o assunto atualização de versão, onde o autor sugere que as atualizações deversões dão sobrevida aos sistemas ERPs; a participação do mercado dos fornecedores de sistemasERPs; e as formas utilizadas para se atualizar o sistema ERP R/3 da SAP. Com base na pesquisa enos assuntos explorados são gerados os instrumentos de coleta de dados. Para execução destetrabalho realizou-se um estudo de caso único com objetivos descritivos visando analisar se algunsdos fatores críticos de implementação de sistemas ERPs se comportam da mesma forma naatualização de versão, justificando as demandas.

IT as an enabler, by obtaining benefits to an organization, was the coherent apprehension behind the purchase of the Enterprise Resource System R/3 by Ericsson in 1997. Public Networks, a 33.000 worker’s division at Ericsson, have had profitability problems during the recent years prior to the purchase. By integrating R/3 with an organizational change, the management aimed to obtain foreseen benefits, such as headcount reduction and shorter lead times. This thesis shows in theory as in practice difficulties and obstacles in reaching and calculating benefits of IT. Through analyzing the system along with the business processes targeted by the integration project, a list of Key Performance Indicators was brought to the stakeholders of the organization. Through numerous interviews and meetings throughout the division the indicators were discussed, depicted and analyzed. In a consensus driven organization as Public Networks, the integration project withholding the largest Enterprise Resource Planning systems had to work politically with communication to be able to gain approval for its benefits. In failing to win the process against different views and stakeholders, benefits was to be at risk and more importantly, later shown to be impossible to measure.