Resumo não pode ser transcrito devido ao seu conteúdo

Resumo não pode ser transcrito devido ao seu conteúdo

Resumo não pode ser transcrito devido ao seu conteúdo

D'abord, on étudie trois façons d'associer une C*-algèbre à une transformation continue. Ensuite, nousdonnons une nouvelle définition de l'entropie. Nous trouvons des relations entre les états KMS des algèbrespréalablement définies et les états d'équilibre, donné par un principe variationnel. Dans la seconde partie,nous étudions les algèbres de Kajiwara-Watatani associées à un système des fonctions itérées. Nouscomparons ces algèbres avec l'algèbre de Cuntz et le produit croisé. Enfin, nous étudions les états KMS desalgèbres de Kajiwara-Watatani pour les actions provenant d'un potentiel et nous trouvouns des relationsentre ces états et les mesures trouvée dans une version de le théorème de Ruelle-Perron-Frobenius pour lessystèmes de fonctions itérées. / First, we study three ways of associating a C*-algebra to a continuous map. Then, we give a new definitionof entropy. We relate the KMS states of the previously defined algebras with the equilibrium states, givenby a variational principle. In the second part, we study the Kajiwara-Watatani algebras associated toiterated function system. We compare these algebras with the Cuntz algebra and the crossed product.Finally, we study the KMS states of the Kajiwara-Watatani algebras for actions coming from a potentialand we relate such states with measures found in a version of the Ruelle-Perron-Frobenius theorem foriterated function systems.

Magíster en Tecnologías de la Información / Hoy en día, el conocimiento se considera como el activo más importante que pueden poseer las empresas y organizaciones, ya que es fundamental para el crecimiento y productividad de éstas. Aquellas organizaciones que tienden a favorecer el crecimiento del conocimiento, buscan generar ventajas competitivas, para poder sobresalir sobre aquellas que no lo hacen. Para poder capturar, organizar y almacenar el conocimiento dentro de las organizaciones, se definieron, hace algún tiempo, conceptos como el de gestión del conocimiento o el de memoria organizacional, dentro de los cuales se idearon técnicas, como la de uso de sistemas de gestión del conocimiento o KMS. Estos sistemas tienen como objetivo básicamente traspasar el conocimiento tácito a conocimiento explícito proveyendo principalmente herramientas como repositorios de documentos, bases de datos de expertos o listas de discusiones. Lo que este trabajo de tesis propone, es el diseño y construcción de una plataforma de gestión del conocimiento con una arquitectura colaborativa y con características de redes sociales, con el fin de incentivar el uso de estas herramientas y poder contar con un sistema mucho más atractivo para las personas, facilitando la transferencia de conocimiento entre los trabajadores, cumpliendo con los objetivos requeridos de una gestión del conocimiento corporativa y facilitando la implantación de un KMS. El caso es aplicado al holding de empresas de Komatsu en Chile, el cual fue estudiado en detalle y desarrollado en base a los requerimientos y problemas comunes de este cliente, el que tuvo una aceptación positiva de parte de los colaboradores durante la marcha blanca y en donde se pudo concluir que esta implementación permitiría mantener e incrementar el conocimiento de la compañía de manera fácil, mejorar la comunicación entre los colaboradores e incentivar la innovación a través de un sistema corporativo y con imagen propia.

We extend the theory of perturbations of KMS states to some class of unbounded perturbations using noncommutative Lp-spaces. We also prove certain stability of the domain of the Modular Operator associated to a ||.||p-continuous state. This allows us to define an analytic multiple-time KMS condition and to obtain its analyticity together with some bounds to its norm. The main results are Theorem 5.1.15, Theorem 5.1.16 and Corollary 5.1.18. Apart from that, this work contains a detailed review, with minor contributions due to the author, starting with the description of C*-algebras and von Neumann algebras followed by weights and representations, a whole chapter is devoted to the study of KMS states and its physical interpretation as the states of thermal equilibrium, then the Tomita-Takesaki Modular Theory is presented, furthermore, we study analytical properties of the modular operator automorphism group, positive cones and bounded perturbations of states, and finally we start presenting multiple versions of noncommutative Lp-spaces. / Apresentamos uma extensão da teoria de perturbações de estados KMS para uma classe de operadores ilimitados através dos espaços Lp não-comutativos. Além disso, provamos certa estabilidade do domínio do Operador Modular de um estado ||.||p-contínuo o que nos permite escrever a condições KMS para tempos múltiplos e obter sua analiticidade junto com majorantes para sua norma. Os principais resultados são o Teorema 5.1.15, o Teorema 5.1.16 e o Corolário 5.1.18. Além disso, nesse trabalho fazemos uma detalhada revisão, com contribuições menores devidas ao autor, começamos com uma descrição de álgebras C* e álgebras de von Neumann, seguida por pesos e representações, um capítulo inteiro é dedicado ao estudo de estados KMS e sua interpretação como estados de equilíbrio térmico, depois apresentamos a Teoria Modular de Tomita-Takesaki, além disso, estudamos as propriedades de analiticidade do grupo de automorfismo modular, cones positivos e perturbações de estados e finalmente, começamos a apresentar múltiplas versões dos espaços Lp não comutativos.

We extend the theory of perturbations of KMS states to some class of unbounded perturbations using noncommutative Lp-spaces. We also prove certain stability of the domain of the Modular Operator associated to a ||.||p-continuous state. This allows us to define an analytic multiple-time KMS condition and to obtain its analyticity together with some bounds to its norm. The main results are Theorem 5.1.15, Theorem 5.1.16 and Corollary 5.1.18. Apart from that, this work contains a detailed review, with minor contributions due to the author, starting with the description of C*-algebras and von Neumann algebras followed by weights and representations, a whole chapter is devoted to the study of KMS states and its physical interpretation as the states of thermal equilibrium, then the Tomita-Takesaki Modular Theory is presented, furthermore, we study analytical properties of the modular operator automorphism group, positive cones and bounded perturbations of states, and finally we start presenting multiple versions of noncommutative Lp-spaces. / Apresentamos uma extensão da teoria de perturbações de estados KMS para uma classe de operadores ilimitados através dos espaços Lp não-comutativos. Além disso, provamos certa estabilidade do domínio do Operador Modular de um estado ||.||p-contínuo o que nos permite escrever a condições KMS para tempos múltiplos e obter sua analiticidade junto com majorantes para sua norma. Os principais resultados são o Teorema 5.1.15, o Teorema 5.1.16 e o Corolário 5.1.18. Além disso, nesse trabalho fazemos uma detalhada revisão, com contribuições menores devidas ao autor, começamos com uma descrição de álgebras C* e álgebras de von Neumann, seguida por pesos e representações, um capítulo inteiro é dedicado ao estudo de estados KMS e sua interpretação como estados de equilíbrio térmico, depois apresentamos a Teoria Modular de Tomita-Takesaki, além disso, estudamos as propriedades de analiticidade do grupo de automorfismo modular, cones positivos e perturbações de estados e finalmente, começamos a apresentar múltiplas versões dos espaços Lp não comutativos.

Healthcare organizations are big source of knowledge creation. Acquiring knowledge, storing and transferring it to others in affective way has its own importance for healthcare organizations. In such organizations, clinical staff is one of the key sources of knowledge creation. This knowledge is important for healthcare organizations to diagnose the diseases and their changing conditions in better way. An intelligent knowledge management system with large amount of such information can fulfill the updated knowledge requirement for healthcare organizations. Our thesis is also consists of such techniques of gathering clinical knowledge. We have proposed a clinical knowledge management system for cross country healthcare organizations. In this study we have discussed about some current issues in clinical knowledge management and proposed our idea as a solution of clinical knowledge management. This study highlights the knowledge management process and their impact on clinical knowledge acquisition.

The intensifying value of learning, competence, and knowledge motivates decisions toward implementing knowledge management systems (KMS) to capitalize on the potential benefits of facilitating knowledge sharing, collecting, storing, and dissemination on a global scale. However, these systems frequently remain underutilized, and organizations encounter obstacles to achieve their proposed outcome. The case company experienced practical problems regarding a newly implemented KMS. The system was largely unused for a specific process. Therefore, this case study investigates the factors affecting KMS adoption and utilization for the technical training process by capturing the perspectives of the intended system users and management. A combination of KMS success factors and The Theory of Affordances were applied to generate knowledge regarding how factors affected the usage of the KMS. It was found that Management Involvement, Organizational Culture and Structure, Employee Commitment, Perceived Benefits, System Complexity, and Compatibility and Conformity influenced the users' KMS utilization outcomes. A conceptual framework was developed to show how these factors affected individuals' affordances process.

The key management system for ERTMS is for now governed by an archaic offline solution,where people transport these keys between the entities and the key management center usingdevices such as CD- or USB-drives. The proposed online solution can instead also providetransport of keys using industrial standard Transport Layer Security (TLS) protocol. This thesisaims to provide insight for the Swedish railway operators in the components that govern animplementation of such a cryptographic key management system, in terms of the mandatorytechnological parts and organizational roles in this socio-technical system. Since the railwaycompanies can be seen as the users of this system, the thesis highlights the complexity regardingfulfilling these security requirements from a user perspective. The results show a conflict ofsecurity and efficiency of the offline system, where the security requirements do not reflect theneeds of the users and as such lower the efficiency due to lowered usability. The results highlightthat a successful implementation of an online system is desired from a usability standpoint of theuser. Furthermore, a complete online key management system cannot be established yet until thecentralized European public key infrastructure has been developed. Ambiguity in an onlinesolution still exists, but is in continuous development and with higher security requirements tocome deriving from IEC 62443. For well-functioning ERTMS on a European level, this thesisshows that a minimum security requirement for a cryptographic key management system shouldbe established to avoid ambiguity and autonomy in the security requirements of differentEuropean countries. In conclusion, in the near future smaller operators are recommended toaquire an online system as a service, from for example its current supplier, and for biggeroperators to evaluate whether to do the same or develop its own key management system andprovide it as service for other railway operators. This key management system should includeparts such as a Public Key Infrastructure (PKI), a Key Management Center (KMC), TLS, backup of the system, a logging system, utilize hardware security modules (HSM) to handlecryptographic material and have staff covering the organizational requirements.