Για τις ανάγκες της παρούσας ερευνητικής εργασίας σχεδιάστηκε ένα εκπαιδευτικό σενάριο το οποίο εμπλέκει τις έννοιες του αρχείου, το προγράμματος και της αρχειοθέτησης με σκοπό να εφαρμοστεί σε μαθητές προσχολικής ηλικίας. Αφορμή για την επιλογή του θέματος στάθηκε το Πιλοτικό Πρόγραμμα Σπουδών για την Πληροφορική στην προσχολική ηλικία αλλά και η έλλειψη παρόμοιων ερευνητικών εργασιών. Η εργασία αποτελεί μία μελέτη περίπτωσης (case study). Σκοπός της έρευνας ήταν να διαφανεί σε πρώτο επίπεδο η ενδεχόμενη μαθησιακή πρόοδος των μαθητών ως προς τις έννοιες αλλά και σε δεύτερο επίπεδο να εξεταστεί αν μπορούν να τις χειριστούν εννοιολογικά. Οι τεχνικές συλλογής δεδομένων είναι το παιδικό σχέδιο, η συνέντευξη και η ηχογράφηση. Μέσα από την εφαρμογή του εκπαιδευτικού σεναρίου παρατηρείται γνωστική πρόοδος στους μαθητές ως προς τις έννοιες οι οποίες εμπλέκονται σε αυτό. / For the purposes of this research was designed an educational scenario that involves the concepts of the file archiving program designed to apply to preschool students . The reason for choosing the topic was the Pilot Program for Information Technology in preschool age and the lack of similar research . This work is a case study (case study). The purpose of this study was to emerge in the first instance any learning progress of students to the concepts and on a second level to consider whether you can handle them conceptually . The data collection techniques are the children's plan , interviewing and recording. Through the implementation of the educational scenario we observed cognitive progress the students to the concepts that are involved in it.

Radiology is rapidly changing in the 21st century and globally there is a transition of radiology departments to digital imaging technology. The major challenge confronting radiology practices is to obtain cost savings and productivity gains once PACS is established. The purpose of the study is to undertake an incremental cost analysis of PACS compared to a conventional radiology department. Cost savings of the system was also determined in terms of productivity gains. An incremental cost analysis for Chest X-rays, CT Brain scans with and without contrast, MRI Brain scans with and without contrast was performed. The overall incremental cost between a PACS site and a conventional radiography site was determined in the study. The net present value technique was also determined to evaluate the capital budgeting requirements for both systems. The incremental costs for capital, RIS and image production for the PACS as well as the conventional system were performed. The incremental costs for both capital and RIS show an increase. In contrast, the incremental PACS image cost shows a reduction. This study provides a number of South African Radiology Departments which plan to introduce PACS in the near future with a bench mark for the financial implications incurred during the implementation phase. It assists other facilities in deciding on implementing PACS and contributes to the development of methodologies within the South African context. / Thesis (M.Med.Sc.)-University of KwaZulu-Natal, 2012

No description available.

Thesis (Ph. D.)--University of Texas at Austin, 1999. / Vita. Includes bibliographical references (leaves 126-134). Available also in a digital version from Dissertation Abstracts.

Thesis (Ph. D.)--UCLA, 2009. / Vita. Includes bibliographical references (leaves 135-149).

A grande demanda por computação de alto desempenho culminou na construção de ambientes de execução de larga escala como as Grades Computacionais. Não diferente de outras plataformas de execução, seus usuários precisam obter os dados de entrada para suas aplicações e muitas vezes precisam armazenar os resultados por elas gerados. Apesar de o termo Grade ter surgido de uma metáfora onde os recursos computacionais estão tão facilmente acessíveis como os da rede elétrica, as ferramentas para gerenciamento de dados e de recursos de armazenamento disponíveis estão muito aquém do necessário para concretizar essa idéia. A imaturidade desses serviços se torna crítica para aplicações científicas que necessitam processar grandes volumes de dados. Nesses casos, utiliza-se apenas os recursos de alto desempenho e assegura-se confiabilidade, disponibilidade e segurança para os dados através de presença humana. Este trabalho apresenta o JavaRMS, um sistema de gerência de dados para Grades. Ao empregar um modelo par-a-par, consegue-se agregar os recursos menos capacitados disponíveis no ambiente de Grade, diminuindo-se assim o custo da solução. O sistema utiliza a técnica de nodos virtuais para lidar com a grande heterogeneidade de recursos, distribuindo os dados de acordo com o espaço de armazenamento fornecido. Empregase fragmentação para viabilizar o uso dos recursos menos capacitados e para melhorar o desempenho das operações que envolvem a transferência de arquivos. Utiliza-se replicação para prover persistência aos dados e para melhorar sua disponibilidade. JavaRMS lida ainda com a dinamicidade e a instabilidade dos recursos através de um modelo de estados, de forma a diminuir o impacto das operações de manutenção. A arquitetura contempla também serviços para gerenciamento de usuários e protege os recursos contra fraudes através de um sistema de cotas. Todas as operações foram projetadas para serem seguras. Por fim, disponibiliza-se toda a infra-estrutura necessária para que serviços de busca e ferramentas de interação com o usuário sejam futuramente fornecidos. Os experimentos realizados com o protótipo do JavaRMS comprovam que usar um modelo par-a-par para organizar os recursos e localizar os dados resulta em boa escalabilidade. Já a técnica de nodos virtuais se mostrou eficiente para distribuir de forma balanceada os dados entre as máquinas, de acordo com a capacidade de armazenamento oferecida. Através de testes com a principal operação que envolve a transferência de arquivos, comprovou-se que o modelo é capaz de melhorar significativamente o desempenho de aplicações que necessitam processar grandes volumes de dados. / Large scale execution environments such as Grids emerged to meet high-performance computing demands. Like in other execution platforms, its users need to get input data to their applications and to store their results. Although the Grid term is a metaphor where computing resources are so easily accessible as those from the eletric grid, its data and resource management tools are not sufficiently mature to make this idea a reality. They usually target high-performance resources, where data reliability, availability and security is assured through human presence. It turns to be critical when scientific applications need to process huge amounts of data. This work presents JavaRMS, a Grid data management system. By using a peer-topeer model, it aggregates low capacity resources to reduce storage costs. Resource heterogeneity is dealt with the virtual node technique, where peers receive data proportionally to their provided storage space. It applies fragmentation to make feasible the usage of low capacity resources and to improve file transfer operations performance. Also, the system achieves data persistence and availability through replication. In order to decrease the impact of maintenance operations, JavaRMS deals with resource dinamicity and instability with a state model. The architecture also contains user management services and protects resources through a quota system. All operations are designed to be secure. Finally, it provides the necessary infrastructure for further deployment of search services and user interactive tools. Experiments with the JavaRMS prototype showed that using a peer-to-peer model for resource organization and data location results in good scalability. Also, the virtual node technique showed to be efficient to provide heterogeneity-aware data distribution. Tests with the main file transfer operation proved the model can significantly improve data-intensive applications performance.

A grande demanda por computação de alto desempenho culminou na construção de ambientes de execução de larga escala como as Grades Computacionais. Não diferente de outras plataformas de execução, seus usuários precisam obter os dados de entrada para suas aplicações e muitas vezes precisam armazenar os resultados por elas gerados. Apesar de o termo Grade ter surgido de uma metáfora onde os recursos computacionais estão tão facilmente acessíveis como os da rede elétrica, as ferramentas para gerenciamento de dados e de recursos de armazenamento disponíveis estão muito aquém do necessário para concretizar essa idéia. A imaturidade desses serviços se torna crítica para aplicações científicas que necessitam processar grandes volumes de dados. Nesses casos, utiliza-se apenas os recursos de alto desempenho e assegura-se confiabilidade, disponibilidade e segurança para os dados através de presença humana. Este trabalho apresenta o JavaRMS, um sistema de gerência de dados para Grades. Ao empregar um modelo par-a-par, consegue-se agregar os recursos menos capacitados disponíveis no ambiente de Grade, diminuindo-se assim o custo da solução. O sistema utiliza a técnica de nodos virtuais para lidar com a grande heterogeneidade de recursos, distribuindo os dados de acordo com o espaço de armazenamento fornecido. Empregase fragmentação para viabilizar o uso dos recursos menos capacitados e para melhorar o desempenho das operações que envolvem a transferência de arquivos. Utiliza-se replicação para prover persistência aos dados e para melhorar sua disponibilidade. JavaRMS lida ainda com a dinamicidade e a instabilidade dos recursos através de um modelo de estados, de forma a diminuir o impacto das operações de manutenção. A arquitetura contempla também serviços para gerenciamento de usuários e protege os recursos contra fraudes através de um sistema de cotas. Todas as operações foram projetadas para serem seguras. Por fim, disponibiliza-se toda a infra-estrutura necessária para que serviços de busca e ferramentas de interação com o usuário sejam futuramente fornecidos. Os experimentos realizados com o protótipo do JavaRMS comprovam que usar um modelo par-a-par para organizar os recursos e localizar os dados resulta em boa escalabilidade. Já a técnica de nodos virtuais se mostrou eficiente para distribuir de forma balanceada os dados entre as máquinas, de acordo com a capacidade de armazenamento oferecida. Através de testes com a principal operação que envolve a transferência de arquivos, comprovou-se que o modelo é capaz de melhorar significativamente o desempenho de aplicações que necessitam processar grandes volumes de dados. / Large scale execution environments such as Grids emerged to meet high-performance computing demands. Like in other execution platforms, its users need to get input data to their applications and to store their results. Although the Grid term is a metaphor where computing resources are so easily accessible as those from the eletric grid, its data and resource management tools are not sufficiently mature to make this idea a reality. They usually target high-performance resources, where data reliability, availability and security is assured through human presence. It turns to be critical when scientific applications need to process huge amounts of data. This work presents JavaRMS, a Grid data management system. By using a peer-topeer model, it aggregates low capacity resources to reduce storage costs. Resource heterogeneity is dealt with the virtual node technique, where peers receive data proportionally to their provided storage space. It applies fragmentation to make feasible the usage of low capacity resources and to improve file transfer operations performance. Also, the system achieves data persistence and availability through replication. In order to decrease the impact of maintenance operations, JavaRMS deals with resource dinamicity and instability with a state model. The architecture also contains user management services and protects resources through a quota system. All operations are designed to be secure. Finally, it provides the necessary infrastructure for further deployment of search services and user interactive tools. Experiments with the JavaRMS prototype showed that using a peer-to-peer model for resource organization and data location results in good scalability. Also, the virtual node technique showed to be efficient to provide heterogeneity-aware data distribution. Tests with the main file transfer operation proved the model can significantly improve data-intensive applications performance.

This thesis describes a process of electronic archiving of documents in an accounting entity, it deals with preparations heading towards electronic archiving, legal requirements for this process and ways of its realisation. In connection to the topic of the thesis the theoretical part introduces the information technologies used in digitisation of paper documents and their further processing. Concerning the area of legislation this thesis describes laws and other legal regulations adjusting or affecting archiving in general and also in its electronical form. Last but not least, systems possible to use for archiving electronic documents are introduced in the thesis. The last section of the theoretical part addresses benefits, drawbacks and possible threats of electronic archiving. Practical part of the thesis consist of evaluation of a survey realized by electronic questionnaire among companies that provide archiving as a service on Czech market.

Health care organisations operate in a eld that is driven by patient, business and legislative demands. Now, Information Technology (IT) is starting to exert its powers on this eld. A revolution is taking place in the health care eld, and IT is playing an increasingly important role. This study originated from realising that medical staff were using technology to help them receive patient studies and do a diagnosis. Health care professionals are very dependent on the availability of the computer systems and on the accuracy of the data that is stored. While health care records may contain information that is of utmost sensitivity, this information is only useful if it is shared with the health care providers and the system under which the patient receives his/her care. The latter trend marks an ever-growing need to protect the confidentiality and integrity of health care information, while at the same time ensuring its availability to authorised health care providers. It has to be acknowledged that a complete protection of data is, in practice, infeasible and impossible. Many systems are not secure, making them vulnerable to attacks. Health care facilities have a challenge of keeping up-to-date with the legal requirements that apply to patient records in order to protect the condentiality, integrity and availability of patient data. This study is aimed at examining the information security of the data in a teleradiology system that is used by a health care facility, and to provide recommendations on how the security can be improved. / Prof. S.H. von Solms

No description available.