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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.
191

Um framework para agentes adaptativos na web semântica

Elian, Daniel da Silva January 2008 (has links)
Made available in DSpace on 2013-08-07T18:43:15Z (GMT). No. of bitstreams: 1 000408109-Texto+Completo-0.pdf: 2444989 bytes, checksum: 8aac156bb8d26425eead423ae07e88d4 (MD5) Previous issue date: 2008 / The current architectures for adaptive agents do not present an explicit concern to the demands of Semantic Web. These demands refer to the use of languages to represent processable metainformation by machines. Furthermore, these architectures are not sufficiently generic to allow basic components, found in most of the adaptive methods, to be used in different domains and problem resolutions, according to the needs of Multiagent Systems appliance. A generic architecture is capable of change its adaptation process, not only the agent structure. In relation to the adaptive processes, they are the all necessary actions to modify the structure of an agent. For these reasons, the actual work aims to present the development of a framework that enables the adaptation of structure and behavior of software agents in the Semantic Web, in accordance with context composed by properties described, mostly, via ontologies. Moreover, this framework makes possible the abstraction of particular architecture used in the construction of an agent, being necessary just the linkage between agent and adaption framework. / As arquiteturas atuais para agentes adaptativos não apresentam uma preocupação explícita para com as exigências da Web Semântica. Essas exigências se referem ao uso de linguagens para se expressar metainformação processável por máquina. Além disso, essas arquiteturas não se mostram genéricas o suficiente para permitirem que componentes básicos, presentes na maioria dos processos adaptativos, sejam utilizados em diferentes domínios e resoluções de problemas, conforme a necessidade de aplicação de Sistemas Multiagentes. Quando se fala em arquitetura genérica, quer-se dizer que a mesma é capaz de alterar o seu processo de adaptação, e não somente a estrutura do agente. Quanto aos processos adaptativos, afirma-se serem todas as ações necessárias para se modificar a estrutura de um agente. Dado ao exposto, o presente trabalho visa apresentar o desenvolvimento de um framework que permita a adaptação da estrutura e do comportamento de agentes de software na Web Semântica, de acordo com o contexto composto por propriedades descritas, principalmente, por meio de ontologias. Adicionalmente, esse framework possibilita a abstração da arquitetura específica utilizada na construção de um agente, sendo necessário apenas o acoplamento entre o agente e o framework de adaptação.
192

PSOA: um framework de práticas e padrões SOA para projetos DDS

Pereira, Marcelo Zilio January 2011 (has links)
Made available in DSpace on 2013-08-07T18:43:27Z (GMT). No. of bitstreams: 1 000434651-Texto+Completo-0.pdf: 1984002 bytes, checksum: 609516108d15d3b415c70eb2d895bd71 (MD5) Previous issue date: 2011 / Many researches have helped to establish correlations between coordination of software development activities and Software Architecture in projects with distributed teams. To better understand how architects are designing this kind of projects we present, in this research, a qualitative study on the influence of Software Architecture in Distributed Software Development (DSD). We collect information from Software Architects involved in DSD projects about the architecture. Information collected has exposed the wide adoption of Service Oriented Architectures (SOA) by companies developing distributed projects, indicating a trend towards to the use of this low coupling architectural style. More detailed data collected by follow-up interviews showed the implementation of practices and SOA design patterns. This practices and patterns were set up in a conceptual framework from which an experiment was conducted to compare the effort in developing DSD projects using the concepts of the framework with effort without using those concepts. The results of this experiment showed that using development practices in SOA can reduce the effort in developing DSD projects based on that architectural style. / Diversas pesquisas têm contribuído para estabelecer a relação entre coordenação de atividades e Arquitetura de Software em projetos com equipes distribuídas. Em um estudo qualitativo preliminar sobre a influência da Arquitetura de Software no Desenvolvimento Distribuído de Software coletou-se informações de Engenheiros de Software de empresas envolvidas em projetos de Desenvolvimento Distribuído de Software. Esse estudo expôs a larga utilização de arquiteturas orientadas a serviço (SOA), indicando uma tendência ao uso desse padrão de arquitetura de baixo acoplamento por empresas que desenvolvem seus projetos de forma distribuída. Estudos posteriores revelaram um conjunto de práticas de desenvolvimento em SOA, utilizadas por essas empresas. Esse conjunto de práticas foi organizado em um framework conceitual a partir do qual se realizou um experimento para comparar o esforço empregado no desenvolvimento de projetos DDS utilizando os conceitos desse framework, com o esforço sem a utilização desses conceitos. Os resultados do experimento mostraram que utilizar as práticas de desenvolvimento em SOA pode reduzir o esforço no desenvolvimento de projetos DDS que utilizam esse estilo arquitetural.
193

Patient and Public Involvement (PPI) : developing a conceptual framework from an exploratory study of three healthcare providers

Todd, Sarah A. January 2018 (has links)
PPI has been growing considerably in the last 15 years in the UK's National Health Service (NHS) following shifts in the relationship between institutions and the public. Various legislative changes during this period have moved the NHS towards a consumerist model of delivery with a greater emphasis on the voice of their service users and the public. High profile cases, such as the severe failings at the Mid-Staffordshire NHS Foundation Trust (Francis, 2013), have provided impetus for PPI. However, despite increases in PPI-related activities, research into PPI methods and their impact have indicated that both methods and impact are difficult to evaluate (e.g. Conklin et al., 2012). Many existing models of PPI appear to over simplify what is a complex social phenomenon. Relatively simple early models such as the ladder of participation (Arnstein, 1969) are still widely referenced. Many studies have focused on individual PPI activities and individual stakeholder perspectives but have paid less attention to the commonalities and differences across and within stakeholder groups and PPI contexts. This study explored the complexities of PPI by collecting detailed observational, documentary and interview data from three different healthcare provider organisations (a mental health trust, a social enterprise, and an acute hospital trust). A range of methods (observations, semi-structured interviews, and document reviews) were used to explore in depth the complex nature of PPI and capture detailed data about contextual and organisational factors. Furthermore, whilst this study aimed to explore a range of activities and individual perspectives across multiple organisations, the ultimate outcome of this research was to produce a conceptual framework that extends theory by placing greater emphasis on the influence of contextual and societal factors. This study identified a plethora of factors that contribute to successful PPI; some of which had been found in previous research (such as personal barriers for laypeople). The constraining role of organisational structures and hierarchies; the strong influence of Government policies and initiatives; and the gatekeeping role of PPI facilitators were novel to this research, or added nuances to existing literature. With regards to the latter, a key finding was the significant role PPI facilitators play in both the implementation and success of PPI work. Their role is essentially a mediator between their employer and patients and the public. This study identified that the role of the voice of patients and the public is negotiated via PPI facilitators, making these key to the success of PPI. PPI facilitators were both responsible for facilitating PPI activities and reporting back the results of that work to senior management (including Board members); the ultimate goal of which was to influence service improvements as well as long term organisational strategies. These findings indicate that a conceptual framework of PPI is needed that considers not just individual perspectives and methods of PPI, but also the process of negotiation via PPI facilitators in making PPI a success.
194

Community corrections in China: problems, political goals, and the way forward

Kong, Qi 30 August 2018 (has links)
In this thesis, I examine the implementation of community corrections in China with a focus on the factors preventing it from functioning effectively, as well as the possible way forward for the system. I introduce the history and legal framework of community corrections in China and the problems with its implementation. Rather than simply identifying the problems at a superficial level, I have analysed the relevant political context and its influence on the application of community corrections in China in order to identify the sources of problems and suggest potential methods to remedy these problems so as to improve implementation. / Graduate
195

Informační portál o zařízeních se systémem Android

Biel, Michal January 2015 (has links)
The goal of this diploma thesis is to design and create web portal about Android devices and to make the portal logo as well. The main part of the portal is public catalog of favourite applications and games, which can be managed by registered users. Other parts of the portal will be writing articles, adding advertisement to market, adding Android devices etc. In this thesis today Android portals will be analysed and identified user's specific needs.
196

Assessment of Czech water-bodies ecological potential based on fish community

BLABOLIL, Petr January 2017 (has links)
Ongoing environmental changes and increasing pressure on freshwater habitat require that we understand the ecological quality of freshwater ecosystems across a wide range of habitat types. This Ph.D. thesis addresses the utility of fish as ecological indicators in heterogeneous reservoir ecosystems. In the first section, I develop suitable indices and calculate ecological potential in two case studies, one using common fish guilds and traits at a large continental scale and another using species-specific indicators for a country-specific dataset. In the second section, I compare the assessment of fish communities across a large geographical region and identify anthropogenic stressors with the highest impact on fish communities. In the third section, I discuss the issue of optimal gillnet sampling design for reliable fish indicator values to increase the utility of assessment methodologies and to reduce sampling effort and fish mortality required to obtain reliable data. In the fourth section, I compare estimates of fish recruitment based on different sampling methods and develop a novel statistical approach to analyse factors affecting fish recruitment. This work provides an initial step towards the improvement of ecological quality of freshwater reservoirs.
197

Proposta de um framework conceitual para apoiar a criação de técnicas de indexação para banco de dados temporais

Lehnen, Alexandre Machado January 2002 (has links)
Bancos de Dados Temporais (BDTs) surgiram para tentar suprir a necessidade de se obter um melhor aproveitamento das informações que circulam atualmente. Porém, ao mesmo tempo em que é benéfico o seu uso, uma vez que armazenam o histórico das informações, existe um problema neste tipo de banco de dados, que é o desempenho. Além do grande volume de dados armazenados, este problema se agrava ainda mais devido à complexidade nas operações que governam os BDTs, como por exemplo, inclusão, remoção, alteração e consulta. Portanto, focalizando o problema, existe a necessidade de melhorar o desempenho dos BDTs frente às operações de manipulação de dados. Técnicas de indexação apropriadas para dados temporais podem amenizar este problema de desempenho. Técnicas consagradas de indexação são largamente usadas, amparadas no seu alto grau de desempenho e portabilidade. São exemplos B-Tree, B+-Tree e R-Tree, entre outras. Estas técnicas não suportam indexar os complexos BDTs, mas são fundamentais para que sirvam de base para novas estruturas que suportem esses tipos de dados. As técnicas de indexação para dados temporais existentes não conseguem suprir a semântica temporal na sua totalidade. Existem ainda algumas deficiências do tipo: poucas técnicas que abrangem ao mesmo tempo tempo de validade e tempo de transação; não existe uma técnica que oferece informações do seu desempenho; a maioria não distingue ponto no tempo de intervalo de tempo; entre outras. Entretanto, possuem características relevantes em cada uma delas. Assim, um estudo das características mais importantes se tornou um fator importante para que possa ser desenvolvido um modelo capaz de auxiliar na criação de novas técnicas de indexação para dados temporais, a fim de contemplar melhor estes tipos de dados. O objetivo deste trabalho é, com base nas características das técnicas estudadas, desenvolver um framework conceitual capaz de auxiliar na criação de novas técnicas de indexação para dados temporais. Esta estrutura apresenta as características mais relevantes das técnicas existentes, agregando novas idéias e conceitos para contemplar os dados temporais. O framework conceitual desenvolvido agrega características de diferentes técnicas de indexação, possibilitando de variar a arquitetura de um índice para dados temporais, ajustando-os para um melhor desempenho em diferentes sistemas. Para validar o framework proposto é apresentada uma especificação de índices para o modelo de dados TF-ORM (Temporal Functionality in Objects With Roles Model).
198

Um Framework para a gerência da disseminação adaptativa de mensagens de segurança em redes veiculares / A Framework for managing adaptive dissemination of safety messages in vehicular networks

Albano, Wellington Araújo 18 December 2015 (has links)
ALBANO, W. A. Um Framework para a gerência da disseminação adaptativa de mensagens de segurança em redes veiculares. 2015. 97 f. Tese (Doutorado em Engenharia de Teleinformática) – Centro de Tecnologia, Universidade Federal do Ceará, Fortaleza, 2015. / Submitted by Hohana Sanders (hohanasanders@hotmail.com) on 2016-11-11T09:46:45Z No. of bitstreams: 1 2015_tese_waalbano.pdf: 2520183 bytes, checksum: 815092503362c3e5ae1ccfbe81ff7551 (MD5) / Approved for entry into archive by Marlene Sousa (mmarlene@ufc.br) on 2016-11-16T17:07:25Z (GMT) No. of bitstreams: 1 2015_tese_waalbano.pdf: 2520183 bytes, checksum: 815092503362c3e5ae1ccfbe81ff7551 (MD5) / Made available in DSpace on 2016-11-16T17:07:25Z (GMT). No. of bitstreams: 1 2015_tese_waalbano.pdf: 2520183 bytes, checksum: 815092503362c3e5ae1ccfbe81ff7551 (MD5) Previous issue date: 2015-12-18 / Vehicular networks (VANETs) are a type of self-organized ad hoc networks, in which the nodes are communication units present in the vehicle or in the road infrastructure. Currently, in research related to vehicular networks there is a great interest in safety-related services that aim at a collaborative traffic that will improve the safety of passengers. Most safety applications require sending data by broadcast, facing some difficulties such as the overhead to the network and other existing challenges in a wireless network environment. To address the problems found in the dissemination of broadcast messages, various proposals are available in the literature that aim to minimize the effect caused by the excessive number of messages, through strategies such as broadcast suppression and adaptation of communication parameters in situations that might compromise the delivery of messages. However, usually such proposals address the adjustment of local parameters such as the transmission power or the contention window size, without considering the overall effect of those adjustments on the network. To manage the way that adaptation is performed and to improve the performance of safety messages delivery, in this work we propose a framework composed of three modules: detection, prevention and adaptation. These three modules utilize information regarding connectivity conditions and network and traffic congestion which are shared with the neighboring vehicles. The proposed solution aims to fill a gap, contributing to manage the implementation of adaptation strategies in order to promote better performance for the dissemination of safety messages. Through simulation, we instantiate the framework in two case studies. At first, we simulate a scenario of an avenue in an urban area with variation in vehicle density. In a second case study, we use two scenarios in different situations. The results show that the application of the framework contributes to a better performance for safety messages dissemination regarding the delivery rate and the amount of sent messages, which are important metrics for this type of service that requires a high delivery rate to be efficient without causing network overhead. Despite the results, an investigation is required on other adaptation strategies such as controlling the transmission rate. The proposed framework, however, can be adapted for using components that address those issues. In addition, techniques different from those used in the modules present in the framework can be analyzed and other types of traffic can be evaluated. It is, therefore, a tool that can be exploited in other research situations. / As redes veiculares (VANETs) são um tipo de rede ad hoc auto-organizada, em que unidades de comunicação presentes nos veículos ou na infraestrutura das rodovias constituem os nós da rede. Atualmente, um dos maiores interesses na pesquisa em redes veiculares são os serviços de segurança, voltados para um trânsito colaborativo e que permita melhorar a segurança dos passageiros. A maioria das aplicações de segurança exige o envio de dados em broadcast, enfrentando algumas dificuldades, como a sobrecarga da rede e outros desafios existentes no ambiente de redes sem fio. Para tratar dos problemas na disseminação das mensagens em broadcast, encontram-se na literatura várias propostas que visam minimizar o efeito causado pelo excesso de mensagens, através de estratégias como supressão de broadcast e adaptação de parâmetros de comunicação em situações que possam comprometer o envio das mensagens. No entanto, normalmente as soluções propostas tratam da adaptação através do ajuste local de parâmetros como a potência de transmissão ou o tamanho da janela de contenção, sem considerar o efeito da adaptação na rede de maneira geral. Para gerenciar a forma com que a adaptação é realizada e melhorar o desempenho da entrega das mensagens de segurança, neste trabalho propomos um framework composto de três módulos: detecção, prevenção e adaptação. Esses três módulos atuam a partir da observação da rede realizada pelos veículos e compartilhada com os veículos vizinhos a respeito das condições de conectividade, congestionamento da rede e congestionamento do trânsito. A solução proposta visa preencher uma lacuna, contribuindo no sentido de gerenciar a aplicação de estratégias de adaptação, com o objetivo de promover um melhor desempenho na disseminação de mensagens de segurança. Através de simulações, instanciamos o framework para a utilização em dois estudos de caso. Em um primeiro momento, simulamos sua aplicação em um cenário de uma avenida em uma zona urbana, com variação na densidade de veículos. Em um segundo estudo de caso, utilizamos dois cenários em situações distintas. Os resultados comprovam que a aplicação do framework contribui para um melhor desempenho na disseminação de mensagens no que diz respeito à taxa de entrega e à quantidade de mensagens enviadas, métricas importantes para esse tipo de serviço, que necessita de uma alta taxa de entrega para ser eficiente sem que isso traga uma sobrecarga à rede. Apesar dos resultados obtidos, é necessária ainda uma investigação sobre a influência de outras estratégias de adaptação, como o controle da taxa de transmissão. O framework proposto, no entanto, pode ser adaptado para a utilização de componentes que tratem desses aspectos. Além disso, técnicas diferentes das utilizadas nos módulos presentes no framework podem ser analisadas e outros tipos de tráfego podem ser avaliados. Trata-se, portanto, de uma ferramenta que pode ser explorada em outras situações de pesquisa.
199

Framework pre Android aplikácie založené na geolokácii a používajúce Linked Data / Framework for geolocation-based Android applications using Linked Data

Snoha, Matej January 2018 (has links)
Title: Framework for geolocation-based Android applications using Linked Data Author: Bc. Matej Snoha The aim of this thesis is to design and implement a framework for geolo- cation based mobile applications using Linked Data. Introduced are Linked Data technologies in the context of mobile application develop- ment, data modeling, and geographical queries. This work follows the software development lifecycle from requirement gathering, software analysis, design of the application framework and its individual compo- nents, up to the implementation of required functionality and subsequent deployment and evaluation of the functional application framework. The resulting implementation of the framework consists of a mobile applica- tion that displays nearby places from Linked Data datasets on a map and a cloud service with a repository of required definitions. It serves to demonstrate functionality of the theoretical part of the work in real-life scenarios.
200

STUDY OF XENON ADSORPTION ON ZEOLITIC IMIDAZOLATE FRAMEWORK - 8

Gallaba, G.M. Dinuka Harshana 01 December 2014 (has links)
The adsorption isotherms can be used to study the properties of a sorbent and to determine the binding energy between a sorbent and a gas that is adsorbed on it. This study that was carried out on a metal organic framework called "Zeolitic imidazolate framework-8" (ZIF-8) as the sorbent. ZIF -8 is known to have a flexible structure and it has shown structural transformation during gas adsorption, at different temperatures. During this study, ZIF-8 was explored using Xenon adsorption. The range of temperatures for the Xenon adsorption isotherms was between 138 K and 157.56 K. During the adsorption of Xenon on ZIF -8 the lowest two isotherms (138 K and 140.39 K) showed two steps. The lower pressure step represents adsorption of Xenon on the "as - produced" ZIF-8. The extra step reflects the structural transition ("gate opening") that occurs due to the re-orientation of the organic linkers in ZIF-8. These changes increase the diameter of the apertures in the structure, and allow more gas molecules to enter in to the ZIF -8 structure. The Xenon adsorption isotherms were also used to determine the effective surface area of ZIF -8 by employing the "point B" method. The binding energy between Xenon and ZIF -8 was found using the isosteric heat for Xenon on ZIF-8 at low coverage. The kinetics of the Xenon adsorption was also studied during this experiment.

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