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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

Plataforma de comunicação tempo real sobre clusters SCI

Heimfarth, Tales January 2002 (has links)
Devido a sua baixa latência de banda, os clusters equipados com o adaptador SCI são uma alternativa para sistemas de tempo real distribuídos. Esse trabalho apresenta o projeto e implementação de uma plataforma de comunicação de tempo real sobre clusters SCI. O hardware padrão do SCI não se mostra adequado para a transmissão de tráfego de tempo real devido ao problema da contenção de acesso ao meio que causa inversão de prioridade. Por isso uma disciplina de acesso ao meio é implementada como parte da plataforma. Através da arquitetura implementada é possível o estabelecimento de canais de comunicação com garantia de banda. Assim, aplicações multimídias, por exemplo, podem trocar com taxa constante de conunicação. Cada mensagem é enviada somente uma vez. Assim, mensagens som a semântica de eventos podem ser enviadas. Além disso, a ordem e o tamanho das mensagens são garantidos. Além do tráfego com largura de banda garantida, a plataforma possibilita a troca de pacotes IP entre diferentes máquinas do cluster. Esses pacotes são inseridos no campo de dados dos pacotes próprios da plataforma e após são enviados através do uso de pacotes IP. Além disso, essa funcionalidade da plataforma permite também a execução de bibliotecas de comunicação baseadas em TCP/IP como o MPI sobre o cluster SCI. A plataforma de comunicação é implementada como modulos do sistema operacional Linux com a execução de tempo real RTAI. A valiação da plataforma mostrou que mesmo em cenários com muita comunicação entre todos os nodos correndo, a largura de banda reservada para cada canal foi mantida.
22

An investigation through sci-fi movies and state-of-the-art literature on hand gesture-based interaction

PINHEIRO, Mariana Gonçalves Maciel 26 February 2016 (has links)
Submitted by Fabio Sobreira Campos da Costa (fabio.sobreira@ufpe.br) on 2017-08-31T14:14:14Z No. of bitstreams: 2 license_rdf: 811 bytes, checksum: e39d27027a6cc9cb039ad269a5db8e34 (MD5) Dissertação-Mariana-Gonçalves.pdf: 2227483 bytes, checksum: b7d8c5a2d8b5413ba4b7deb0487b279f (MD5) / Made available in DSpace on 2017-08-31T14:14:14Z (GMT). No. of bitstreams: 2 license_rdf: 811 bytes, checksum: e39d27027a6cc9cb039ad269a5db8e34 (MD5) Dissertação-Mariana-Gonçalves.pdf: 2227483 bytes, checksum: b7d8c5a2d8b5413ba4b7deb0487b279f (MD5) Previous issue date: 2016-02-26 / CNPQ / Gesture is a form of non-verbal communication using various body parts, mostly hand and face. It is the oldest method of communication used by humans becoming essential. By existing for a long time, the use of gestures is natural in interaction between humans, which means that its use does not cause awkwardness between people. Since the rise of technologies such as the computer, scientists have been looking for the best ways to enable the interaction of man with these machines. The gestures are presented as an valuable option because they are common to human beings and simple to be realized. Several devices began to be developed in order to be able to identify sets of gestures made by people and enabling, thus, new interactions. These sets of gestures tend to be generated by scientists themselves, by test users or even movies, are sometimes used as a means to inspire researchers. However, it is important to note that do not necessarily gestures are the best alternative to human-computer interaction. Science fiction movies (sci-fi) are one of the sources from which researchers extract ideas for new ways of interaction. The fact that they are being presented and followed around the world makes interactions found in sci-fi movies more accessible and easy to be accepted by the final public. Movies like Minority Report (1995) inspired and inspire many researchers in the search for a perfect interaction system, as the one shown in the film. Movies are a tool used by film producers to predict their own future visions that are harvested by researchers to be tested and, if produce good results, introduced in the market. By owning several sources of appearance, the hand gestures used in human-machine interactions, generally do not have a certain pattern. Each researcher and film producer gives the gesture interpretation what they believe to be the most appropriate. Thus, it is not difficult to find identical hand gestures generating distinct interactions. In this context, the work presented in this dissertation aims to collect and expose aspects to hand gestures found in science fiction films and papers published in scientific databases. For this, questions such as "Where does the gesture come from?", "What does it mean?", "How is it done?" and “What is it good for?” are answered through mappings that were performed using found hand gestures and sorting them into categories able to respond how hand gestures are being used either by researchers or by film producers. / O gesto é uma forma de comunicação não verbal utilizando várias partes do corpo, principalmente mãos e face. É o método mais antigo de comunicação utilizado pelos seres humanos tornando-se imprescindível. Por existir há muito tempo, o uso de gestos é natural na interação entre humanos, o que quer dizer que seu uso não provoca estranheza entre as pessoas. Desde o surgimento de tecnologias como o computador, cientistas têm procurado as melhores maneiras de possibilitar a interação do homem com essas máquinas. Os gestos se apresentaram como uma opção valiosa, pois são comuns aos seres humanos e simples de serem realizados. Diversos dispositivos começaram a ser desenvolvidos no intuito de conseguir identificar conjuntos de gestos realizados pelas pessoas e viabilizar, assim, novas interações. Esses conjuntos de gestos tendem a ser gerados pelos próprios cientistas, por usuários de teste ou até mesmo por filmes, utilizados por vezes como meio de inspirar os pesquisadores. No entanto, é importante salientar que não necessariamente gestos são a melhor alternativa na interação homem-computador. Filmes de ficção científica (sci-fi) são uma das fontes de onde pesquisadores extraem ideias para novos modos de interação. O fato de estarem sendo apresentadas e acompanhadas por todo o mundo torna as interações encontradas em filmes de sci-fi mais acessíveis e fáceis de serem aceitas pelo público final. Filmes como Minority Report (1995) inspiraram e inspiram muitos pesquisadores na busca de um sistema de perfeita interação, como mostrado no filme. O cinema é uma ferramenta utilizada pelos produtores de filmes para predizer suas próprias visões de futuro que são colhidas por pesquisadores para serem testadas e, se produzirem bons resultados, introduzidas no mercado. Por possuir diversas fontes de surgimento, os gestos de mão utilizados nas interações humano-máquina, geralmente, não possuem um padrão determinado. Cada pesquisador ou produtor de filme dá ao gesto a interpretação que acredita ser a mais adequada. Assim, não é difícil encontrar gestos de mão idênticos gerando interações distintas. Neste contexto, o trabalho apresentado nesta dissertação tem por objetivo coletar e expor aspectos relacionados a gestos de mão encontrados em filmes de ficção científica e em trabalhos publicados em bases de dados científicas. Para isso, perguntas como “de onde o gesto vem?”, “o que o gesto significa?”, “como o gesto é realizado?” e “para que o gesto é bom?” são respondidas através de mapeamentos que foram realizados utilizando os gestos de mão encontrados e classificando-os em categorias capazes de responder como os gestos de mão estão sendo utilizados seja por pesquisadores ou por produtores de cinema.
23

Avaliação da locomoção do paraplégico sob estimulação elétrica neuromuscular / Evaluation of paraplegic locomotion aided by functional electrical stimulation

Juracy Emanuel Magalhães da Franca 27 November 2003 (has links)
Este trabalho apresentará um projeto cujo propósito foi definir um protocolo de avaliação para pacientes paraplégicos sob terapia, através do uso de estimulação elétrica neuromuscular, no ambulatório de ortopedia do Hospital das Clínicas da Universidade de Campinas. A análise proposta servirá tanto para o acompanhamento da evolução dos pacientes, quanto, principalmente, para avaliação dos sistemas de reabilitação desenvolvidos pelo laboratório de biocibernética e engenharia de reabilitação na Escola de Engenharia de São Carlos. Neste trabalho o protocolo foi aplicado especificamente para descrever a locomoção do paraplégico usando a estimulação padrão de 4 canais, que realiza a ativação dos quadríceps para extensão das pernas, necessária para o suporte do corpo, e a ativação do reflexo de retirada através da estimulação do nervo fibular para a flexão necessária para a fase de balanço. A análise usou como referência o conhecimento relacionado à descrição das fases e estratégias usadas pela locomoção do ser humano intacto. O protocolo de avaliação usou recursos do laboratório de biomecânica e reabilitação do aparelho locomotor, situado no hospital citado acima, que permitiram a descrição da cinemática dos membros superiores e inferiores, da atividade muscular realizada pelos membros superiores, e das forças de reação do solo. / This work present a case study on the use of the motion analysis laboratory resources (three-dimensional motion capture system, EMG, and force plate) with the purpose of improve the use of surface electrical stimulation to enable the locomotion in paraplegic subjects. Five trials for each of the five patients (thoracic complete spinal cord lesion) using a four channel electrical stimulator was done for synchronously acquisition of: 3D coordinates of 30 markers distributed on the whole body (to evaluate the stride\'s characteristics and three-dimensional measurements of angles of whole-body); EMG signal, on both sides, of triceps brachii long head, pectoralis major, middle deltoideus, extensor carpi radialis; and the vertical component of the ground reaction force. All data were normalized on the right gait cycle. The analysis was done braking the cycle in 11 events related with the swing phase in both sides, because it was focused firstly in the actions related with the swing limb and upper body advance, that represents a critical factor in locomotion aided by electrical stimulation. These events divided the gait cycle in 10 phases, which was used for associate the data evaluated with specifics tasks. The results showed temporal parameters similar to that reported by other authors, specific characteristics of the patient, the mechanism used by the patient for advance the body, and the periods of high activity of the muscles on the cycle.
24

Co-delivery of Two Growth Factors From Combined PLGA and PLLA/PCL Microsphere Scaffolds for Spinal Cord Injury Repairs

Li, Zhongxuan January 2014 (has links)
The purpose of this study is to demonstrate the effectiveness of spheres-in-tube structured scaffolds to sequentially deliver two biomolecules during two phases of tissue regeneration following spinal cord injury (SCI). Scaffolds were synthesized of a poly (lactic-co-glycolic acid) (PLGA) base combined with Poly (L-lactic acid) / Poly (ε-caprolactone) (PLLA/PCL) microspheres. The scaffolds are constructed by leveraging the different solubilities of PLGA, PLLA and PCL in super critical carbon dioxide and ethyl acetate during fabrication processes. Microspheres can reduce the pore size and porosity of PLGA scaffolds; this enhances their mechanical strength and enables them to provide long-term treatment without collapse. The release of the epidermal growth factor (EGF) and basic fibroblast growth factor (FGF-b) are being used to study the release profiles of the designed scaffolds. The analysis shows that FGF-b is released from high porosity PLGA base as the first delivery vehicle and completes the release in the first week. PLLA or PCL microspheres, having the property of sustainably delivering encapsulated EGF in 36 days, are used as the second drug delivery vehicle. FGF-b released within the first week can mimic biomolecules used to protect the surviving neurons and promote the development of sprout axons. The sustained release of EGF from microspheres is used for long-term therapy to differentiate multipotent cells into determined types at the injury site. The results demonstrate that these enhanced parameters along with the ability of sequential co-delivery of growth factors, make these designed scaffolds a promising candidate in SCI studies.
25

Evaluating Dissolved Oxygen Regimes Along a Gradient of Human Disturbance for Lotic Systems in West-Central Florida

Hammond, Daniel G 17 July 2009 (has links)
Land uses dominated by human activity can have a significant effect on ecological processes. In Florida, oxygen depletion is the most common impairment in lake, stream, and coastal water bodies. The continual growth and development in Florida, along with a conversion to more human intense land uses warrants study and discussion on impacts to dissolved oxygen regimes along a gradient of human disturbance. This research study is designed to identify observable trends in dissolved oxygen regimes along a gradient of increasing human intensity. Twenty-six stations in the Tampa Bay area were selected to represent lotic systems in west-central Florida. Data was collected quarterly, during four-day deployments, using a deployable data sonde. Grab samples for nutrients and chlorophyll-a provided antecedent data to explain observed trends. Physical components of streams, such as channelization were also taken into account. Biological integrity of streams was assessed to identify if altered dissolved oxygen regimes as a result of human land use significantly affect the health of the systems. Analysis included the use of Spearman rank order correlations to identify patterns. Dissolved oxygen regimes were correlated with the Landscape Development Intensity Index (LDI). Nutrients, primary productivity, and physical alteration to the streambed play a significant role in understanding how land use affects dissolved oxygen regimes. Results indicate the intensity of human land use has a significant effect on dissolved oxygen regimes and has significant policy implications for Florida's Total Maximum Daily Load (TMDL) program. Diel variation in oxygen measurements may be a more appropriate indicator of impairment and stream biological integrity.
26

Untersuchung eines Zusammenhanges zwischen den Downloadzahlen von Sci-Hub und Entwicklungen in bibliothekarischen Konsortialverhandlungen 2017 anhand ausgewählter Länder

Rudolph, Theres 28 April 2021 (has links)
Die vorliegende Bachelorarbeit beschäftigt sich mit illegalen Zugriffen von Forschern auf die Schattenbibliothek Sci-Hub, im Zusammenhang zu Kündigungen von Zeitschriftenabonnements und -lizenzen an wissenschaftlichen Bibliotheken. Durch einen stetigen Anstieg der Kosten, sind viele Bibliotheken gezwungen diese zu kündigen. In dieser Arbeit wird auch eine Analyse der neueren Literatur zu diesen Themen vorgenommen. Die Forschungsfrage der Arbeit lautet wie folgt: „Gibt es einen Zusammenhang zwischen Entwicklungen in Nationalkonsortien und den entsprechenden nationalen Zugriffzahlen auf Sci-Hub?“. Dazu werden Daten betrachtet, die über die Nutzung von Sci-Hub im Jahr 2017 informieren. Untersucht werden die Länder Deutschland, Taiwan, die Niederlande und Luxemburg. Die Daten wurden auf einer MySQL-Datenbank gespeichert und von dort abgefragt; die Weiterverarbeitung der Zahlen erfolgte in Excel. In allen Ländern konnten im Zuge abgeschalteter Verlagszugänge steigende Zugriffszahlen auf Sci-Hub beobachtet werden, allerdings gab es Unterschiede bei der weiteren Nutzung, nachdem Wiedererlangen von lizensierten Zugängen an wissenschaftlichen Bibliotheken. Das Ergebnis zeigt, dass Forschende Sci-Hub hauptsächlich nutzen, da ihnen eine einfachere Möglichkeit des Zuganges zu benötigter Literatur zu fehlen scheint. Aber auch Bequemlichkeit und sinkende moralische Bedenken scheinen eine nicht unerhebliche Rolle zu spielen.:Abkürzungsverzeichnis Abbildungsverzeichnis 1. Einleitung 1.1. Hintergrund und Zielstellung der Arbeit 1.2. Methoden 1.2.1. Über die Daten 1.2.2. Bearbeitung der Daten 2. Bibliothekarische Ausgangssituation 2.1. Die Open-Access-Bewegung: Geschichte, aktueller Stand und Probleme 2.2. Sci-Hub: Entwicklung, Nutzung, Problematik und Diskussion 2.2.1 Allgemeine Informationen 2.2.2. Funktionsweise 2.2.3. Gerichtliches Vorgehen gegen Sci-Hub 2.2.4. Nutzergruppen 2.2.5. Diskussion in der Literatur 2.3. Bibliothekskonsortien als Mittel der Open-Access-Bewegung 2.4. Beteiligte Konsortien 2.4.1. Deutschland: Projekt DEAL 2.4.2. Taiwan: CONCERT 2.4.3. Niederlande: VNSU 2.4.4. Luxemburg: Consortium 3. Untersuchung 3.1. Zur Auswertung 3.2. Deutschland 3.3. Taiwan 3.4. Niederlande 3.5. Luxemburg 4. Diskussion 4.1. Diskussion der Forschungsfrage 4.2. Einschränkungen, Probleme und Ausblick 5. Schlusswort Literaturverzeichnis Selbstständigkeitserklärung Anhang
27

Fourth industrial revolution and the transformation of capitalism into the post-scarcity society

Mizerák, Michal January 2019 (has links)
This diploma thesis aims to evaluate post-scarcity and utopian theories in response to the current economic changes in developed countries to identify, whenever a theory is able to explain the current trends and providing a realistic economic outcome on post-scarcity society. This thesis deals with the resource scarcity, labour scarcity and role of the medium of exchange in theories; together with unconditional income, polarization of labour and technological progress in the transposing developed economies to the 4th industrial revolution.
28

An Improved Knee Joint Locking Mechanism for a Hybrid Exoskeleton

Dennis, Eric Robert 29 January 2019 (has links)
No description available.
29

The Furniture of Science Fiction Films: Studying Audience Cognitive Mechanisms to Understand how Designed Objects Convey Social Ideas through the Semantic Differential Method

Han, Tong 09 July 2019 (has links)
No description available.
30

Data Driven Video Source Camera Identification

Hopkins, Nicholas Christian 15 May 2023 (has links)
No description available.

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