923 resultados para Adoção de TI
Resumo:
En los últimos años, el desarrollo industrial a nivel globalizado en los diferentes sectores, la difusión de la TI y el uso estratégico de la misma, han crecido de manera exponencial. El uso adecuado de esta, se ha convertido en una gran preocupación para los órganos de gobierno de las organizaciones ya que la falta de dirección y control en las inversiones que se realizan en ellas, así como un uso inadecuado de las mismas pueden comprometer la consecución de los objetivos de la organización, su competitividad y su sostenibilidad a medio-largo plazo. La preocupación de los propietarios de los negocios es mejorar su rendimiento con la ayuda de la TI frente a sus competidores, realizando los procesos de negocio de una manera eficaz y eficiente, por lo que muchas organizaciones han realizado inversiones importantes en la adquisición de tecnología para lograr sus propósitos. Sin embargo la ejecución de estas inversiones no se ha gestionado adecuadamente, conforme a las políticas y planes especificados en los planes de negocio de la organización y la entrega de los servicios de TI no ha sido conforme a los objetivos previstos, generando pérdidas importantes y lo que es peor un gran deterioro de la imagen de la organización, por lo que consideramos a la gestión de la demanda estratégica de la TI como uno de los factores claves para el éxito de los negocios, el cual no ha sido tomada en cuenta por los consejos de gobierno o los altos ejecutivos de las organizaciones. La investigación comienza con una amplia revisión de la literatura, identificando dos elementos muy importantes, la demanda y el suministro de la TI dentro de la gobernanza corporativa de la TI; notándose la escasa información relacionado con la gestión de la demanda estratégica de la TI. Se realizó un estudio exploratorio para conocer como los miembros del consejo de administración y altos ejecutivos de una organización gestionan la demanda estratégica de la TI, obteniendo una respuesta de 130 encuestados, donde se confirma que hace falta normas o metodologías para la gestión de la demanda estratégica de la TI. En base a estos resultados se ha construido un marco de trabajo para todo el proceso de la gestión de la demanda de la TI y como una solución que se plantea en esta tesis doctoral, consiste en la elaboración de una metodología, combinando e integrando marcos de trabajo y estándares relacionados con la gobernanza corporativa de la TI. La metodología propuesta está conformada por tres fases, cada fase con sus actividades principales, y cada actividad principal por un conjunto de sub-actividades. Además, se establecen los roles y responsabilidades de los altos ejecutivos para cada una de las actividades principales. Esta propuesta debe ser de fácil implantación y aplicable en las organizaciones, permitiendo a estas afrontar con éxito el desarrollo de sus negocios, con una mejor calidad, reduciendo los costes de operación y empleando el menor tiempo posible. La validación de la metodología propuesta se realizó a través de una encuesta online y un estudio de casos. En la encuesta de validación participaron 42 altos ejecutivos de diferentes empresas y el estudio de casos se realizó con 5 empresas internacionales. Las respuestas de los estudios fueron analizados, para determinar la aceptación o el rechazo de la metodología propuesta por los participantes, confirmando la validez y confiabilidad del estudio. Este es uno de los primeros estudios reportado con evidencias empíricas para el proceso de la gestión de la demanda estratégica de la TI. Los resultados de esta investigación han sido publicados en revistas y congresos internacionales. ABSTRACT In recent years, the globalized industrial development, diffusion and strategic use of IT in different sectors has grown exponentially. Proper use of IT has become a major concern for government bodies and organizations. Uncontrolled or mismanaged IT investments or improper IT use may compromise the achievement of an organization’s objectives, competitiveness and sustainability in the medium to long term. Business owners set out to use IT to outperform their competitors, enacting business processes effectively and efficiently. Many organizations have made significant investments in technology in order to achieve their aims. However, the deployment of these investments has not been managed properly in accordance with the policies and plans specified in the organizations’ business plans, and IT services have not been delivered in accordance with the specified objectives. This has generated significant losses and, worse still, has seriously damaged the image of organizations. Accordingly, we believe that IT strategic demand management is one of the key factors for business success which has not been overlooked by the boards of trustees or senior executives of organizations. The research begins with an extensive review of the literature. This review has identified two very important elements: IT demand and supply within the corporate governance of IT. We have found that information related to IT strategic demand management is scant. We conducted an exploratory study to learn how members of the board of directors and senior executives of an organization manage IT strategic demand. The survey, which was taken by 130 respondents, confirmed that standards or methodologies are needed to manage IT strategic demand. Based on the results, we have built a framework for the entire IT demand management process. The solution proposed in this thesis is to develop a methodology, combining and integrating frameworks and standards related to the corporate governance of IT. The proposed methodology is divided into three phases. Each phase is composed of a series of key activities, and each key activity is further split into minor activities. We also establish the roles and responsibilities of senior executives for each of the key activities. This proposal should be easy to implement and apply in organizations, enabling corporations to successfully conduct better quality business, reduce operating costs and save time. The proposed methodology was validated by means of an online survey and a case study. The validation survey was completed by 42 senior executives from different companies, and the case study was conducted at five international companies. The study results were analysed to determine the acceptance or rejection of the proposed methodology by the participants, confirming the validity and reliability of the study. This is one the first studies to report empirical evidence for the process of IT strategic demand management. The results of this research have been published in international journals and conferences.
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We investigated the electrical transport properties of ultraheavily Ti-implanted silicon layers subsequently pulsed laser melted (PLM). After PLM, the samples exhibit anomalous electrical behaviour in sheet resistance and Hall mobility measurements, which is associated with the formation of an intermediate band (IB) in the implanted layer. An analytical model that assumes IB formation and a current limitation effect between the implanted layer and the substrate was developed to analyse this anomalous behaviour. This model also describes the behaviour of the function V/Delta V and the electrical function F that can be extracted from the electrical measurements in the bilayer. After chemical etching of the implanted layer, the anomalous electrical behaviour observed in sheet resistance and Hall mobility measurements vanishes, recovering the unimplanted Si behaviour, in agreement with the analytical model. The behaviour of V/Delta V and the electrical function F can also be successfully described in terms of the analytical model in the bilayer structure with the implanted layer entirely stripped.
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Long-length ultrafine-grained (UFG) Ti rods are produced by equal-channel angular pressing via the conform scheme (ECAP-C) at 200 °C, which is followed by drawing at 200 °C. The evolution of microstructure, macrotexture, and mechanical properties (yield strength, ultimate tensile strength, failure stress, uniform elongation, elongation to failure) of pure Ti during this thermo-mechanical processing is studied. Special attention is also paid to the effect of microstructure on the mechanical behavior of the material after macrolocalization of plastic flow. The number of ECAP-C passes varies in the range of 1–10. The microstructure is more refined with increasing number of ECAP-C passes. Formation of homogeneous microstructure with a grain/subgrain size of 200 nm and its saturation after 6 ECAP-C passes are observed. Strength properties increase with increasing number of ECAP passes and saturate after 6 ECAP-C passes to a yield strength of 973 MPa, an ultimate tensile strength of 1035 MPa, and a true failure stress of 1400 MPa (from 625, 750, and 1150 MPa in the as-received condition). The true strain at failure failure decreases after ECAP-C processing. The reduction of area and true strain to failure values do not decrease after ECAP-C processing. The sample after 6 ECAP-C passes is subjected to drawing at 200¯C resulting in reduction of a grain/subgrain size to 150 nm, formation of (10 der="0" style="vertical-align:bottom" width="10" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els cdn.com/content/image/1-s2.0-S0921509312015559-si0007.gif">1¯0) fiber texture with respect to the rod axis, and further increase of the yield strength up to 1190 MPa, the ultimate tensile strength up to 1230 MPa and the true failure stress up to 1600 MPa. It is demonstrated that UFG CP Ti has low resistance to macrolocalization of plastic deformation and high resistance to crack formation after necking.
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In this study, we present a structural and optoelectronic characterization of high dose Ti implanted Si subsequently pulsed-laser melted (Ti supersaturated Si). Time-of-flight secondary ion mass spectrometry analysis reveals that the theoretical Mott limit has been surpassed after the laser process and transmission electron microscopy images show a good lattice reconstruction. Optical characterization shows strong sub-band gap absorption related to the high Ti concentration. Photoconductivity measurements show that Ti supersaturated Si presents spectral response orders of magnitude higher than unimplanted Si at energies below the band gap. We conclude that the observed below band gap photoconductivity cannot be attributed to structural defects produced by the fabrication processes and suggest that both absorption coefficient of the new material and lifetime of photoexcited carriers have been enhanced due to the presence of a high Ti concentration. This remarkable result proves that Ti supersaturated Si is a promising material for both infrared detectors and high efficiency photovoltaic devices.
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Computational homogenization by means of the finite element analysis of a representative volume element of the microstructure is used to simulate the deformation of nanostructured Ti. The behavior of each grain is taken into account using a single crystal elasto-viscoplastic model which includes the microscopic mechanisms of plastic deformation by slip along basal, prismatic and pyramidal systems. Two different representations of the polycrystal were used. Each grain was modeled with one cubic finite element in the first one while many cubic elements were used to represent each grain in the second one, leading to a model which includes the effect of grain shape and size in a limited number of grains due to the computational cost. Both representations were used to simulate the tensile deformation of nanostructured Ti processed by ECAP-C as well as the drawing process of nanostructured Ti billets. It was found that the first representation based in one finite element per grain led to a stiffer response in tension and was not able to predict the texture evolution during drawing because the strain gradient within each grain could not be captured. On the contrary, the second representation of the polycrystal microstructure with many finite elements per grain was able to predict accurately the deformation of nanostructured Ti.
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The effect of the applied stress on the deformation and crack nucleation and propagation mechanisms of a c-TiAl intermetallic alloy (Ti-45Al-2Nb-2Mn (at. pct)-0.8 vol. pct TiB2) was examined by means of in situ tensile (constant strain rate) and tensile-creep (constant load) experiments performed at 973 K (700 �C) using a scanning electron microscope. Colony boundary cracking developed during the secondary stage in creep tests at 300 and 400 MPa and during the tertiary stage of the creep tests performed at higher stresses. Colony boundary cracking was also observed in the constant strain rate tensile test. Interlamellar ledges were only found during the tensile-creep tests at high stresses (r>400 MPa) and during the constant strain rate tensile test. Quantitative measurements of the nature of the crack propagation path along secondary cracks and along the primary crack indicated that colony boundaries were preferential sites for crack propagation under all the conditions investigated. The frequency of interlamellar cracking increased with stress, but this fracture mechanism was always of secondary importance. Translamellar cracking was only observed along the primary crack.
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Notación musical en v. h. CXV-h. CXXVIII
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Los avances tecnológicos actuales que han llevado a una economía globalmente conectada, junto con la creciente tendencia hacia la privatización, globalización y desregulación están dando lugar a nuevos modelos organizativos y a un aumento de la colaboración entre proveedores y clientes, compartiendo información y flujos de proceso. Todo ello ha contribuido directamente a la gran expansión del outsourcing y a que se considere como una herramienta estratégica para las organizaciones. En este entorno y dada la creciente complejidad organizativa, el uso de una metodología para ayudar a la implantación de proyectos de outsourcing se ha convertido en algo casi necesario. En los últimos años se han propuesto algunas metodologías, especialmente para apoyo de las organizaciones cliente de outsourcing, pero no consideramos que sean completas en cuanto a contemplar todos los aspectos necesarios para guiar un proyecto de outsourcing. Es por ello que, en este artículo, proponemos una metodología para gestión de proyectos de outsourcing de TI desde el punto de vista del proveedor que sea completa y fácil de aplicar. Abstract -. Current technological advances that have led to a globally connected economy, together with the increasing trend towards privatization and deregulation, are leading to new organizational models and increased collaboration between suppliers and customers, sharing information and process flows. This has directly contributed to the great expansion of outsourcing, considering it as a strategic tool for organizations. In this environment, and given the increasing organizational complexity, the use of a methodology to assist the implementation of outsourcing projects has become almost necessary. In recent years several methodologies and models have been proposed, especially for supporting client outsourcing organizations, but we do not consider them to be complete, they do not cover all necessary aspects to manage an outsourcing project. That is the reason because we, in this paper, propose a methodology for outsourcing project management from the point of view of the suppliers that was complete and easy to apply.
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La tecnología de la información y su utilización en las empresas ha sido y es un elemento de debate ya que las organizaciones cuentan con grandes éxitos y grandes fracasos. Gran parte de estos últimos asociados a una falta de visión estratégica integral en relación a la utilización de TI en la organización lo que ha dado lugar al área del conocimiento llamada Gobernanza de TI y a la publicación de numerosos marcos y estándares. Un campo sensible y económicamente muy importante tanto para Uruguay como a nivel mundial son las empresas medianas y pequeñas (PyMEs), las que no logran aplicar de manera efectiva los marcos y estándares, es por esta razón que el objetivo final de esta tesis es el de construir un marco que permita a las PyMEs incorporar un marco efectivo para gobernar y gestionar TI adecuadamente obteniendo el valor esperado de las inversiones realizadas. Para alcanzar este objetivo general se ha realizado un estudio de campo que permita conocer la situación de la gobernanza y la gestión de TI en PyMEs del Uruguay; a partir de este estudio se pudo analizar cuáles son los factores más significativos que no permiten la correcta aplicación de buenas prácticas de gobernanza de TI en éstas empresas. Los resultados encontrados llevaron a la construcción de un marco de gobernanza de TI con foco en PyMEs, a la definición de un modelo de madurez asociado al marco y a una guía de implantación. En el marco de gobernanza propuesto, compatible con el estándar ISO/IEC 38500:2008, se han fortalecido los procesos que, por las características propias de las PyMEs presentan debilidades estructurales y se han reducido o eliminado aquellos que por las mismas razones no son aplicables a este tipo de organización. Finalmente se validaron los resultados en un entorno empresarial definiendo un estudio de caso. Los resultados obtenidos con una mejora porcentual consolidada del 46% en el conjunto de indicadores definidos llevan a considerar que la aplicación del marco fue exitosa. Por ser un estudio de caso único, los resultados no deben ser generalizados y una oportunidad de trabajo futuro es replicar el mismo estudio en otras empresas. ABSTRACT Information technology (IT) and its use in the enterprise context is a discussion element because organizations have numerous successes and failures using it. Most of the IT failed projects have a lack of integral strategic vision in relation with IT use in the organization. This fact has resulted in the IT Governance (ITG) area of knowledge. A large number of standards and frameworks have been published in relation with it. Small and medium enterprises (SMEs) are an important and sensible field in all economies around the world, particularly in Uruguay, an underdeveloped country of South America. Commonly, SMEs cannot apply successfully ITG frameworks because of the intrinsic complexity or because a lack of knowledge and culture respect this field, so the objective of this thesis is build a framework that allows SMEs to incorporate an effective framework to govern and manage IT properly, helping enterprises get the expected value of its IT investments. In a first place, has been conducted a field study to know the quality of actual practices relatively to the ITG and IG management in Uruguayan SMEs. With the obtained results in the study we can make a diagnostic of the most significant factors that prevent the proper application of good IT governance practices in these companies. The obtained results were the inputs to the definition of a IT governance framework with focus in SMEs, a maturity model associated with it and a implementation guide. The proposed framework is ISO/IEC 38500 standard compatible always with an SME vision so, sensible and weak processes have been strengthened and other ones have been eliminated because have no application in these type of organization. Finally the results were validated in a business environment by defining a case study. The results obtained with a consolidated percentage improvement of 46% in the defined set of indicators suggest that the implementation of the framework was successful. As a single case study, the results should not be generalized and an opportunity for future work is to replicate the same study in other companies.
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El objetivo de este trabajo es dar una visión de cuál es el potencial y beneficio que una Oficina de Gestión de Proyectos (PMO) es capaz de aportar a una organización. Cómo contribuye y garantiza que la estrategia de la compañía se está ejecutando. Para ello se realiza un estudio comparativo de tres empresas internacionales que pertenecen al ámbito TI. Se han seleccionado parámetros de medida clave para la obtención de datos. El análisis de los datos ha proporcionado la información necesaria para contestar cómo la PMO puede contribuir a ayudar a una organización a tener un progreso mensurable hacia el logro de la estrategia. ---ABSTRACT---The objective of this thesis is to highlight the potential benefits that a Project Management Office (PMO) is capable of providing to companies and businesses. The use of PMO greatly helps businesses succeed in strategic planning. In order to prove its effectiveness, I have provided a comparative study between three different international IT companies. These companies were selected for key parameters in obtaining data. The information gathered from the analysis of these companies has provided the necessary information to conclude that the implementation of PMO helps organizations make measurable progress in the area of strategic planning.
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El mercado de outsourcing ha estado creciendo en los últimos años y se prevé que lo siga haciendo en los próximos, pero este crecimiento ha estado limitado por el fracaso de muchos proyectos que, en algunos casos, han llevado a las organizaciones a asumir de nuevo esos servicios (insourcing). Estos fracasos se han debido en gran parte a los problemas con los proveedores: falta de experiencia, de capacidades para asumir los proyectos, dificultad en la comunicación,… A diferencia de lo que ocurre en otras disciplinas, no existe una metodología que ayude, tanto a los clientes como a los proveedores de servicios de outsourcing de TI, a gobernar y gestionar sus proyectos y conseguir los resultados buscados. En los últimos años han aparecido, al mismo tiempo que la expansión del outsourcing, algunos modelos y marcos de buenas prácticas para la gestión de los proyectos de outsourcing, pero generalmente sólo cubren algunos aspectos de la gestión. No se los puede considerar metodologías, porque no definen roles, responsabilidades ni entregables. Por lo general, son el resultado de la experiencia en la gestión de otros tipos de proyectos. Hay que considerar también que, excepto eSCM-SP, que es un modelo de buenas prácticas para mejorar la capacidad en la provisión de servicios, están todos orientados al cliente. El objetivo de esta tesis es, por un lado, demostrar la necesidad de contar con una metodología que guíe a los proveedores durante todo el ciclo de vida un proyecto de outsourcing y, por otro, proponer una metodología que contemple desde la fase inicial de la búsqueda de oportunidades de negocio, evaluación de las propuestas RFP, la decisión de hacer una oferta o no para la prestación de servicios, la participación en la due diligence, la firma del contrato, la transición y la entrega de servicios, hasta la finalización del contrato. La metodología se ha organizado en base a un ciclo de vida del outsourcing de cinco etapas, definiendo para cada una de ellas los roles que participan y las responsabilidades que deberán asumir, las actividades a realizar y los entregables que se deberán generar, y que servirán de elementos de control tanto para la gestión del proyecto como para la provisión del servicio. La validación de la metodología se ha realizado aplicándola en proyectos de provisión de servicios de TI de una mediana empresa española y comparando los resultados obtenidos con los conseguidos en proyectos anteriores. ABSTRACT The outsourcing market has been growing in recent years and it is expected to keep doing so in the coming years, but this growth has been limited by the failure of many projects that, in some cases, has led organizations to take back those services (insourcing). These failures have been due to a major degree to problems with providers: lack of experience and capacity to take on the projects, and difficulties of communication. Unlike what happens in other disciplines, there is no methodology for helping both customers and providers of outsourcing services. In recent years, some good practice frameworks have also appeared at the same time as the expansion of outsourcing. They are not methodologies because they have not defined any roles, responsibilities and deliverables. These frameworks aim to help organizations to be successful at managing and governing outsourcing projects. They are usually the result of their experience in managing other kinds of projects. In consequence, it is not appropriate to name them "methodologies" for managing outsourcing projects and much less "standards". It is also important to note that all existing good practice frameworks, except eSCM-SP, are client-oriented. The aim of this thesis is to state the need to propose a methodology that guides providers throughout the whole outsourcing life cycle and facilitates the provision of quality services and their management, and the proposal of a methodology in which the stages, activities, deliverables, roles and responsibilities are clearly defined. The proposed methodology cover all the stages of the outsourcing life cycle, from the early stage of searching for business opportunities, evaluation of the RFP proposals, the decision to bid or not to bid for the service provision, participation in the due diligence if necessary, the signing of the contract, the transition and delivery of service to the termination of the contract. For each activity, roles, responsibilities and deliverables have been defined. The validation of the methodology has been done by applying it in the provision of some outsourcing projects carried out by a Spanish IT medium company and comparing the results with those obtained in previous projects.
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Experimental diffusion data were critically assessed to develop the atomic mobility for the bcc phase of the Ti–Al–Fe system by using the DICTRA software. Good agreements were obtained from comprehensive comparisons made between the calculated and the experimental diffusion coefficients. The developed atomic mobility was then validated by well predicting the interdiffusion behavior observed from the diffusion-couple experiments in available literature.
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This work aims to contribute to a further understanding of the fundamentals of crystallographic slip and grain boundary sliding in the γ-TiAl Ti–45Al–2Nb–2Mn (at%)–0.8 vol%TiB2 intermetallic alloy, by means of in situ high-temperature tensile testing combined with electron backscatter diffraction (EBSD). Several microstructures, containing different fractions and sizes of lamellar colonies and equiaxed γ-grains, were fabricated by either centrifugal casting or powder metallurgy, followed by heat treatment at 1300 °C and furnace cooling. in situ tensile and tensile-creep experiments were performed in a scanning electron microscope (SEM) at temperatures ranging from 580 °C to 700 °C. EBSD was carried out in selected regions before and after straining. Our results suggest that, during constant strain rate tests, true twin γ/γ interfaces are the weakest barriers to dislocations and, thus, that the relevant length scale might be influenced by the distance between non-true twin boundaries. Under creep conditions both grain/colony boundary sliding (G/CBS) and crystallographic slip are observed to contribute to deformation. The incidence of boundary sliding is particularly high in γ grains of duplex microstructures. The slip activity during creep deformation in different microstructures was evaluated by trace analysis. Special emphasis was placed in distinguishing the compliance of different slip events with the Schmid law with respect to the applied stress.
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The metallization stack Ti/Pd/Ag on n-type Si has been readily used in solar cells due to its low metal/semiconductor specific contact resistance, very high sheet conductance, bondability, long-term durability, and cost-effectiveness. In this study, the use of Ti/Pd/Ag metallization on n-type GaAs is examined, targeting electronic devices that need to handle high current densities and with grid-like contacts with limited surface coverage (i.e., solar cells, lasers, or light emitting diodes). Ti/Pd/Ag (50 nm/50 nm/1000 nm) metal layers were deposited on n-type GaAs by electron beam evaporation and the contact quality was assessed for different doping levels (from 1.3 × 1018 cm−3 to 1.6 × 1019 cm−3) and annealing temperatures (from 300°C to 750°C). The metal/semiconductor specific contact resistance, metal resistivity, and the morphology of the contacts were studied. The results show that samples doped in the range of 1018 cm−3 had Schottky-like I–V characteristics and only samples doped 1.6 × 1019 cm−3 exhibited ohmic behavior even before annealing. For the ohmic contacts, increasing annealing temperature causes a decrease in the specific contact resistance (ρ c,Ti/Pd/Ag ~ 5 × 10−4 Ω cm2). In regard to the metal resistivity, Ti/Pd/Ag metallization presents a very good metal conductivity for samples treated below 500°C (ρ M,Ti/Pd/Ag ~ 2.3 × 10−6 Ω cm); however, for samples treated at 750°C, metal resistivity is strongly degraded due to morphological degradation and contamination in the silver overlayer. As compared to the classic AuGe/Ni/Au metal system, the Ti/Pd/Ag system shows higher metal/semiconductor specific contact resistance and one order of magnitude lower metal resistivity.
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O principal objetivo deste estudo foi identificar e analisar qual o impacto da tecnologia da informação (TI) na satisfação das pessoas em uma empresa pública. Este estudo pretendeu abordar o assunto de forma a concentrar-se na investigação, com um estudo de caso em uma empresa pública de saneamento ambiental da região do grande ABC paulista, o SEMASA, com o intuito de avaliar as mudanças nas rotinas operacionais dos diversos departamentos da empresa e o impacto causado pela TI na satisfação das pessoas envolvidas. Com base na literatura sobre trabalho e sociedade na era da globalização e empresas públicas, foram analisados inicialmente os motivos que podem contribuir para as pessoas buscarem ingressar na carreira pública. Esse estudo verificou a importância da adoção de ferramentas de tecnologia nos processos produtivos e na prestação de serviços das organizações. Verificou também, que estimular os funcionários de empresas públicas a criarem mecanismos para facilitarem seus trabalhos, através de ferramentas de TI atualizadas, pode ser benéfico, ao mesmo tempo em que pode proporcionar condições destes adquirirem novas capacitações profissionais com a aquisição de novos conhecimentos tecnológicos. Os resultados obtidos apontaram para um significativo aumento na satisfação das pessoas envolvidas sendo estas estimuladas a estarem em constante aperfeiçoamento, através da realização de novos treinamentos e cursos de tecnologia.(AU)