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Kraus, Edwin. "Interworking methodologies for DCOM and CORBA." [Johnson City, Tenn. : East Tennessee State University], 2003. http://etd-submit.etsu.edu/etd/theses/available/etd-1104103-205221/unrestricted/KrausE110503b.pdf.
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Thesis (M.S.)--East Tennessee State University, 2003.Title from electronic submission form. ETSU ETD database URN: etd-1104103-205221. Includes bibliographical references. Also available via Internet at the UMI web site.
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Barbagallo, Mariano. "HV Interleaved Multiphase DcDc Buck-Boost Converter." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.
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in electric vehicle (ev) systems, bi-directional dc-dc converters are used to interface the rechargeable energy storage system (ress) such as the battery bank with the high voltage dc-link of the inverter. currently multi-cell batteries used in automotive systems, such as ev or hev, are subject to a higher failure rate than single cell batteries. the more cells are used in series, the greater the opportunities to fail and the worse the reliability. when a cell has failed the entire string or even worse the battery must be replaced, which is extremely costly [1]. so, to have less cells in series increases the reliability of the system, which also leads to a lower voltage of the dc link. for this reason and many others, in a hybrid or electric vehicle powertrain, a boost dc-dc converter enables optimization of the battery system.
this work aims to investigate all the benefits that come with interleaving technique in dc-dc converters for automotive systems. indeed, these kind of converters for use in high-performance and high-power applications have received increasing interest in recent years. in particular this research work, done with sevcon ltd focuses on the theory behind bi-directional multiphase interleaved (imc) converter and how it could be used to interface a rechargeable energy storage system (ress) to the powertrain of a hybrid or electric vehicle.
more specifically, it was investigated if it is possible to use (after appropriate hardware and software amendments) a standard three phase ac motor inverter as a multiphase interleaved converter. for this purpose two motor controller, produced by sevcon have been analysed. both the gen4 size 10 and the hvlp inverters were considered for use as a dc-dc converter. the voltage can step up or down based on the power flow direction. each phase is indeed a bi-directional buck or boost converter, which is composed of a bridge of power switches and inductor.
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Roque, Vitor Manuel Gomes. "Arquitecturas distribuídas cliente/servidor : CORBA, DCOM e JavaRMI." Master's thesis, Universidade de Aveiro, 1999. http://hdl.handle.net/10773/13036.
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Mestrado em Engenharia Electrónica e TelecomunicaçõesNa era das comunicações e da multimédia, as Arquitecturas Distribuídas Cliente/Servidor têm vindo a ganhar cada vez mais representatividade no panorama actual do desenvolvimento de aplicações. Verbas avultadas têm sido investidas pelas empresas desenvolventes deste tipo de tecnologia de forma a melhorar o mais possível e no menor espaço de tempo as suas plataformas com o intuito de ganhar a maior representatividade possível na área da computação distribuída. A presente dissertação centra-se precisamente na análise de três das mais importantes arquitecturas distribuídas cliente/servidor disponíveis actualmente no mercado, nomeadamente as arquitecturas CORBA, DCOM e JavaRMI. A escolha destas arquitecturas não foi aleatória e teve como base a sua importância no mercado actual. A primeira - a CORBA - por ser fomentada pelo OMG, organização internacional formada por mais de 800 membros, a segunda - o DCOM - pela importância da empresa que a desenvolve, a Microsoft, devido ao peso desta no mundo da informática e a terceira - a JavaRMI - pela crescente popularidade da linguagem Java. Nesta análise são focados os pontos mais importantes de cada uma das arquitecturas e como é que estes pontos podem ser factores decisivos na escolha das plataformas por parte das organizações. Neste sentido, o segundo capítulo desta dissertação faz uma retrospectiva de tecnologias até se atingir o estado actual, as arquitecturas distribuídas cliente/servidor. Nos terceiro, quarto e quinto capítulos são abordados de forma sucinta as três arquitecturas CORBA, DCOM e JavaRMI respectivamente. No sexto capítulo é apresentada uma comparação das funcionalidades das três arquitecturas no que respeita a: Interoperabilidade. Fiabilidade. Maturidade da Plataforma. Finalmente no sétimo capítulo são apresentadas algumas das conclusões retiradas ao longo desta dissertação.
In the communication and multimedia era, Distributed Client/Server Architectures has come to have more and more representation in the current panorama of application development. Large amounts have been invested by companies that develop this kind of technology in order to improve their platforms as quickly and as much as possible with the objective of gaining as much representation as possible in the area of distributed computation. This dissertation is focussed precisely on the analysis of three of the largest distributed client/server architectures currently available on the market, namely CORBA, DCOM, and JavaRMI. The choice of these architectures was not random but, rather, based on their significance on the current market: the first, CORBA, for being supported by the OMG, an international organization of more than 800 members; the second, DCOM, for the significance of the company that is developing it, Microsoft, due to its weight in the computer world; and the third, JavaRMI, for the increasing popularity of Java language. In this analysis, the most important points of each of the architectures are focussed on, exploring how each of these points can be decisive factors in the choice of platforms on the part of organizations. Accordingly, the second chapter of this dissertation gives a retrospective view of technology up to the current state, distributed client/server architectures. In the third, fourth, and fifth chapters, the three architectures, CORBA, DCOM and JavaRMI, respectively, are dealt with succinctly. In the sixth chapter, a comparison of the functionality of the three architectures is presented with respect to: Interoperability. Reliability. Platform Maturity. Finally, in the seventh chapter, some of the conclusions drawn throughout the dissertation are presented.
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Childs, Edward William. "The roles of the locust DCMD in collision detection." Thesis, University of Newcastle Upon Tyne, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.300191.
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Vaško, Martin. "Systém pro podporu sledování a řízení IT dle DCMM." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2021. http://www.nusl.cz/ntk/nusl-445477.
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Developeri v IT tíme vidia IT manažment ako vedúcich ich oddelenia a IT projektov. Úzkoprsosť manažmentu spoločnosti je často videná ako problém v riadení IT. Avšak v DCMM terminológii sa od vedúcich manažmentu vyžaduje rovnocenná diskusia medzi oboma účastníkmi. Pri rovnocennej diskusii to má za pozitívny dopad na pracovníkov IT a riešenia IT projektu, než pri nerovnocennej komunikácií. Navrhovaný systém umožňuje uživateľom (IT manažérom) manažovať a zobrazovať zdroje IT oddelenia, aktuálny stav projektu a aktuálny pohľad na manažment IT v DCMM perspektíve. Hlavné zameranie je kladené na extrakciu záznamov z rôznych nástrojov, ktoré sú spojené do príbehov. Tieto príbehy vytvárajú reťazec navzájom súvisiacich krokov, ktoré majú buď pozitívny alebo negatívny dopad na podnikanie. DCMM metriky boli realizované pre pomoc IT manažmentu aby sa vďaka ním vedel rozhodnúť ísť v smere nových myšlienok alebo sa držať ďaleko od inovácií. Pri použití nástroja, je manažmentu podniku ľahšie určiť, či DCMM pomôže danej spoločnosti byť inovatívna alebo či sa má rozhodnúť zostať v užívaní aktuálneho manažérskeho modelu. Na základe aktuálnych a predošlých udalostí odohraných vo firme, ktoré sa zobrazia je nutné vykonať manažérsku analýzu pre zistenie nových vedomostí.
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Prado, Monja Silvia Sales. "Tradução e adaptação cultural do Developmental Coordination Disorder Questionnaire (DCDQ)." Universidade Federal de Minas Gerais, 2007. http://hdl.handle.net/1843/MSMR-777JBN.
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In Brazil, there are no available instruments for the detection of children with developmental coordination disorders (DCD), which impairs its diagnosis and treatment. The cultural adaptation of the Developmental Coordination Disorder Questionnaire (DCDQ), a questionnaire for parents, represents an attempt to develop an instrument for the detection of children with motor coordination problems in Brazil. Aims of the present investigation were a) to translate the DCDQ to Portuguese and adapt it to the Brazilian culture; b) to examine the comprehension and adequacy of DCDQ-Brazil for the Brazilian population through the experimental application of the translated test; c) investigate the psychometrical qualities of the adapted questionnaire; d) indicate the instruments limitations and, if necessary, propose the review or exclusion of items to make it clinically useful for the DCD detection among Brazilian children.Methods included translation of the DCDQ according to internationally used procedures, followed by the use of the translated questionnaire DCDQ-Brazil in a sample of 45 children, 15 of which showed coordination problems and 30 with typical developmental patterns. Data analysis indicated that items 3) and 13) were not efficient for the discrimination of motor coordination problems and did not represent typical aspects of the Brazilian culture. Two other versions of the questionnaire, A and B, were then created in which these items were substituted by others with better psychometrical characteristics. There was an improvement in test-retest reliability (from 0,953 in the original version to 0,973 in both versions A and B) and in internal consistency (from 0,915 in the original version to 0,926 in version A and 0,918 in version B). Sensitivity (0,73) and specificity (0,87), as well as positive prediction value (0,73) and negative prediction value (0,87) also underlined version As superiority, which should be maintained in future investigations.It was concluded that the translation process was valid and that DCDQ-Brazil, as a short instrument with simple applicability, is potentially useful for the detection of DCD among Brazilian children. Further research involving broader samples is necessary to verify the score patterns of Brazilian children in different ages and to determine cut-off scores that allow a more reliable classification of children for diagnostic evaluation and epidemiological studies.No Brasil, não existem instrumentos para a detecção de crianças com Transtorno do Desenvolvimento da Coordenação TDC, o que limita seu diagnóstico e tratamento. A adaptação cultural do Developmental Coordination Disorder Questionnaire DCDQ, um questionário para pais, representa uma tentativa de disponibilizar um instrumento para a detecção de crianças com problemas de coordenação motora no Brasil. Os objetivos do presente estudo foram (a) fazer a tradução para a Língua Portuguesa e a adaptação para a cultura brasileira do DCDQ, (b) examinar a compreensão e adequação do DCDQ-Brasil para a população brasileira, por meio da aplicação experimental do teste traduzido, (c) examinar as qualidades psicométricas do questionário adaptado, e (d) indicar as limitações do instrumento e, se necessário, propor a revisão ou a exclusão de itens, de forma a torná-lo clinicamente útil para detecção de TDC em crianças brasileiras. A metodologia incluiu a tradução do DCDQ, segundo procedimentos usados internacionalmente, seguida da aplicação do questionário traduzido DCDQ-Brasil em uma amostra de 45 crianças, sendo 15 com problemas de coordenação e 30 com desenvolvimento típico. Na análise dos dados, observou-se que os items 3) e 13), além de não apresentarem boa discriminação para problemas de coordenação motora, não representavam aspectos típicos da cultura brasileira. Foram, então criadas as versões A e B do questionário, nas quais esse itens foram substituídos por outros de melhores qualidades psicométricas. Houve melhoria na confiabilidade teste-reteste, que passou de 0,953 na versão original para 0,973 na versão A e 0,973 na versão B, e na consistência interna, que na versão original era 0,915 e passou para 0,926 na versão A e 0,918 na versão B. Dados de sensibilidade (0,73) e especificidade (0,87), valor de predição positivo (0,73) e negativo (0,87) também indicam superioridade da versão A, que deve ser mantida em estudos futuros. Conclui-se que o processo de tradução foi válido e que o DCDQ-Brasil, como instrumento curto e de fácil aplicação, tem bom potencial para ser usado na detecção do TDC em crianças brasileiras. Futuros estudos, com amostragem mais ampla, serão necessários para verificar o padrão de escores de crianças brasileiras nas diferentes idades e determinar pontos de corte, que permitam a triagem mais confiável de crianças para avaliação diagnóstica e estudos epidemiológicos.
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Williams, Jacqueline Louise, and jacqueline williams@mcri edu au. "Motor imagery and developmental coordination disorder (DCD)." RMIT University. Health Sciences, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080617.141139.
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Developmental Coordination Disorder (DCD) is characterised by impairments to motor control and learning, the cause of which remains unclear. Recently, researchers have used cognitive neuroscientific approaches to explore the basis of poor coordination in children, with one hypothesis suggesting that an internal modelling deficit (IMD) is one of the underlying causes of DCD. The aim of this thesis was to further test the IMD hypothesis using a motor imagery paradigm - the mental rotation of hands. Versions of this task were used in all studies to assess motor imagery ability, with an additional whole-body task used in Studies 2 and 3. Further, an alphanumeric rotation task was used in Studies 1 and 2 to assess visual imagery ability. Studies 1 and 2 provided varying levels of support for the IMD hypothesis. In Study 1, only a subgroup of DCD children performed differently from other children in the study on the hand tasks, but tighter task constraints in Study 2 led to overall group differences between DCD and controls in terms of accuracy. The DCD group were also significantly less accurate than controls in the whole-body task, but there were no group differences in either Study 1 or 2 on the visual imagery task. Interestingly, in Study 2, there was an indication that children with severe levels of motor impairment were less accurate than children with less severe motor impairment, suggesting that motor impairment level could play a role in the severity of motor imagery deficits. Study 3 was designed to explore the impact of motor impairment severity on motor imagery ability further. The results confirmed that children with severe DCD had greater motor imagery impairment than children with mild DCD - children with severe DCD performed less accurately than both controls and those with mild DCD in the hand task with instructions and the controls in the whole-body task. Further, those children with mild DCD were able to respond somewhat to motor imagery instructions, whereas those with severe DCD were not. This study provided support to the IMD hypothesis, though the deficit was shown to be dependent on a number of factors. Chapter 5 presents a reasoned account of these various findings and their implications are discussed. It is concluded that motor imagery deficits are evident in many children with DCD, but more so in children with severe motor impairment. A general imagery deficit was ruled out based on the findings of Studies 1 and 2 which showed that visual imagery processes appear intact in children with DCD. Taken together with previous imagery and IMD studies, and related research on feedforward control in DCD, it is concluded that the deficits in motor imagery observed in this thesis are consistent with the hypothesis that an IMD is one likely causal factor in the disorder, particularly in more severe DCD. The observation of differing response patterns between children with mild and severe forms of DCD has important implications for developing a theory of DCD and for remediation.
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Liu, Jie. "DCD algorithm : architectures, FPGA implementations and applications." Thesis, University of York, 2008. http://etheses.whiterose.ac.uk/1629/.
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In areas of signal processing and communications such as antenna array beamforming, adaptive filtering, multi-user and multiple-input multiple-output (MIMO) detection, channel estimation and equalization, echo and interference cancellation and others, solving linear systems of equations often provides an optimal performance. However, this is also a very complicated operation that designers try to avoid by proposing different sub-optimal solutions. The dichotomous coordinate descent (DCD) algorithm allows linear systems of equations to be solved with high computational efficiency. It is a multiplication-free and division-free technique and, therefore, it is well suited for hardware implementation. In this thesis, we present architectures and field-programmable gate array (FPGA) implementations of two variants of the DCD algorithm, known as the cyclic and leading DCD algorithms, for real-valued and complex-valued systems. For each of these techniques, we present architectures and implementations with different degree of parallelism. The proposed architectures allow a trade-off between FPGA resources and the computation time. The fixed-point implementations provide an accuracy performance which is very close to the performance of floating-point counterparts. We also show applications of the designs to complex division, antenna array beamforming and adaptive filtering. The DCD-based complex divider is based on the idea that the complex division can be viewed as a problem of finding the solution of a 2x2 real-valued system of linear equations, which is solved using the DCD algorithm. Therefore, the new divider uses no multiplication and division. Comparing with the classical complex divider, the DCD-based complex divider requires significantly smaller chip area. A DCD-based minimum variance distortionless response (MVDR) beamformer employs the DCD algorithm for multiplication-free finding the antenna array weights. An FPGA implementation of the proposed DCD-MVDR beamformer requires a chip area much smaller and throughput much higher than that achieved with other implementations. The performance of the fixed-point implementation is very close to that of floating-point implementation of the MVDR beamformer using direct matrix inversion. When incorporating the DCD algorithm in recursive least squares (RLS) adaptive filter, a new efficient technique, named as the RLS-DCD algorithm, is derived. The RLS-DCD algorithm expresses the RLS adaptive filtering problem in terms of auxiliary normal equations with respect to increments of the filter weights. The normal equations are approximately solved by using the DCD iterations. The RLS-DCD algorithm is well-suited to hardware implementation and its complexity is as low as O(N2) operations per sample in a general case and O(N) operations per sample for transversal RLS adaptive filters. The performance of the RLS-DCD algorithm, including both fixed-point and floating-point implementations, can be made arbitrarily close to that of the floating-point classical RLS algorithm. Furthermore, a new dynamically regularized RLS-DCD algorithm is also proposed to reduce the complexity of the regularized RLS problem from O(N^3) to O(N^2) in a general case and to O(N) for transversal adaptive filters. This dynamically regularized RLS-DCD algorithm is simple for finite precision implementation and requires small chip resources.
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Yvert, Gaëtan. "Modélisation de l'organisation fonctionnelle de la lecture chez le sujet sain : Etude en EEG-HR par reconstruction de sources et modèles causaux dynamiques. Applications aux patients épileptiques." Thesis, Grenoble, 2012. http://www.theses.fr/2012GRENS044/document.
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L'écriture et donc a fortiori la lecture est une invention trop récente pour que le substrat neuronal sous tendant ce processus cognitif ait évolué pour se spécialiser dans la reconnaissance visuelle des mots. Ainsi les régions fonctionnelles de la lecture repose à la fois sur les aires corticales dédiées au langage et à la reconnaissance visuelle des objets. Cependant, l'identification complète nécessite au delà du décryptage orthographique, le décodage phonologique ainsi que la récupération de la sémantique. De très nombreuses études en neuroimagerie et en particulier l'IRM se sont intéressées à la localisation des différentes aires fonctionnelles sous tendant ces différentes taches cognitives. Cependant la faible résolution temporelle de l'IRM n'a pas permis de mettre en évidence la dynamique d'intégration au sein du réseau fonctionnel de la lecture. Les enregistrements électrophysiologiques, comme l'EEG, permettent la mise en évidence de la dynamique neuronale grâce à son excellente résolution temporelle. Cependant, la localisation des aires corticales ayant générés les courants de scalp est un problème méthodologique très complexe. Depuis une dizaine d'année, de nombreuses avancées majeures ont été effectuées dans la localisation de source en utilisant des méthodologies nouvelles permettant ainsi de mettre en évidence à la fois les régions fonctionnelles impliquées dans le traitement cognitif ainsi que la dynamique temporelle d'intégration au sein du réseau. Par ailleurs, d'une vision localisationniste, les recherches actuelles tendent vers une vision hodotopique où la fonction d'une région dépend plus de ses connections avec les autres régions du réseau que de sa localisation précise. De nouvelles méthodologies comme les modèles causaux dynamiques permettent de mettre en évidence la structure du réseau et de son fonctionnement. L'objectif de cette thèse a été d'utiliser les derniers outils méthodologiques mis au point afin non seulement de mettre en évidence le réseau de la reconnaissance visuelle des mots mais aussi de proposer un modèle théorique de l'intégration fonctionnelle. En particulier, nous avons mis en évidence l'importance des connexions feedback sur le traitement bottom up de la reconnaissance visuelle des mots à l'instar des objets. Par ailleurs, nous avons appliqué ces méthodologies chez le patient épileptique afin de mettre en évidence les réorganisations fonctionnelles induites par la présence d'un foyer au niveau des régions temporales gaucheWriting and then a fortiori reading is a too recent invention for evolution to develop a specialized neuronal substrate sustaining the visual word form recognition. Thereby functional region underlying reading process rest on cortical area dedicate to language and visual recognition of objects. However, complete identification of a word requires beyond the orthographic decryption, phonological decoding and semantic recovery. Numerous neuroimaging studies and in particular with fMRI have tried to localize the functional regions sustaining these different cognitive processes. Nonetheless, the weak temporal resolution of fMRI do not allowed revealing the dynamic of integration within the reading network. Electrophysiological recording as EEG permit to show the neuronal dynamic thanks to its excellent temporal resolution. However, localization of the cortical area having generate the scalp electrical field is a complex methodological issue. Since a decade, numerous breakthroughs in methodology allow not only to localize functional region but also the temporal dynamic of their interaction. Moreover, from a localisationnist point of view, current research have adopted an hodotopic vision supposing that the function of a region is more depend of its connectivity with the other region of the network than of its precise location. New methodologies as dynamic causal modeling permit to show the network structure and its dynamic integration. The goal of this thesis has been to use latest methodological development to reveal not only the network of the word recognition, but also to propose a functional model of the integration of the visual stimuli within this network. In particular, we have shown the importance of feedback connection on bottom up processing in word recognition as it has been shown for objects recognition. In addition, we have applied those methodologies to epileptic patients to reveal the influence of a left temporal lesion on the functional reorganization of the reading network
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Khalid, Shehla. "Towards Data Governance for International Dementia Care Mapping (DCM). A Study Proposing DCM Data Management through a Data Warehousing Approach." Thesis, University of Bradford, 2010. http://hdl.handle.net/10454/5226.
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Information Technology (IT) plays a vital role in improving health care systems by enhancing the quality, efficiency, safety, security, collaboration and informing decision making. Dementia, a decline in mental ability which affects memory, concentration and perception, is a key issue in health and social care, given the current context of an aging population. The quality of dementia care is noted as an international area of concern.
Dementia Care Mapping (DCM) is a systematic observational framework for assessing and improving dementia care quality. DCM has been used as both a research and practice development tool internationally. However, despite the success of DCM and the annual generation of a huge amount of data on dementia care quality, it lacks a governance framework, based on modern IT solutions for data management, such a framework would provide the organisations using DCM a systematic way of storing, retrieving and comparing data over time, to monitor progress or trends in care quality.
Data Governance (DG) refers to the implications of policies and accountabilities to data management in an organisation. The data management procedure includes availability, usability, quality, integrity, and security of the organisation data according to their users and requirements.
This novel multidisciplinary study proposes a comprehensive solution for governing the DCM data by introducing a data management framework based on a data warehousing approach. Original contributions have been made through the design and development of a data management framework, describing the DCM international database design and DCM data warehouse architecture. These data repositories will provide the acquisition and storage solutions for DCM data. The designed DCM data warehouse facilitates various analytical applications to be applied for multidimensional analysis. Different queries are applied to demonstrate the DCM data warehouse functionality.
A case study is also presented to explain the clustering technique applied to the DCM data. The performance of the DCM data governance framework is demonstrated in this case study related to data clustering results. Results are encouraging and open up discussion for further analysis.
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Hedlund, Magnus. "Design and construction of a bidirectional DCDC converter for an EV application." Thesis, Uppsala University, Electricity, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-119916.
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A Sliding Mode Control System for a Bidirectional DCDC Converter was designed and a low voltage prototype was constructed. The control system based its decisions solely on the latest available measurements, which improves performance when changing operative quadrant, since no memory needs reinitializing (such as for PI and state prediction methods). A boost control philosophy was presented, based on a current source approximation. The control was found to be stable without steady-state errors when the variance of the input/output dynamics was high.
The target application for the DCDC Converter is an EV (Electric Vehicle) with a flywheel driveline, which puts additional requirements of the converter. Among these are current and voltage control, bidirectionality, and a broad input voltage range.
Simulations were performed in Simulink prior to physical implementation, proving functionality of the proposed control system. The physical implementation of the control was done on a digital signal processor with code compiled from C. A median filter was designed to increase measurement efficiency for the current sensors which had shot-like noise distortions.
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Malhotra, Divya. "brk1 and dcd1 Act Synergistically in Subsidiary Cell Formation in Zea mays." Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc799473/.
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Subsidiary mother cell (SMC) divisions during stomatal complex formation in Zea mays are asymmetric generating a small subsidiary cell (SC) and a larger epidermal cell. Mutants with a high number of abnormally shaped subsidiary cells include the brick1 (brk1) and discordia1 (dcd1) mutants. BRK1 is homologous to HSPC300, an ARP2/3 complex activator, and is involved in actin nucleation while DCD1 is a regulatory subunit of the PP2A phosphatase needed for microtubule generation (Frank and Smith, 2002; Wright et al. 2009). Possible causes of the abnormal SCs in brk1 mutants include a failure of the SMC nucleus to polarize in advance of mitosis, no actin patch, and transverse and/or no PPBs (Gallagher and Smith, 2000; Panteris et al 2006). The abnormal subsidiary mother cell division in dcd1 is due to correctly localized, but disorganized preprophase bands (PPBs; Wright et al. 2009). The observation that brk1 has defects in PPB formation and that the dcd1 phenotype is enhanced by the application of actin inhibitors led us to examine the dcd1; brk1 double mutant (Gallagher and Smith, 1999). We found that dcd1; brk1 double mutants demonstrate a higher percentage of aberrant SCs than the single mutants combined suggesting that these two mutations have a synergistic and additive effect on SC formation. Our observations and results are intriguing and the future step will be to quantitate the abnormal PPBs and phragmoplasts in the double and single mutants using immunolocalization of tubulin and actin as well as observations of live cells expressing tubulin-YFP.
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Basheer, Shamnad. "The invention of an investment incentive for pharmaceutical innovation." Thesis, University of Oxford, 2011. https://ora.ox.ac.uk/objects/uuid:b53d2ab0-dcdd-4adc-8728-cdf32e948df6.
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Pharmaceutical drugs are often hailed as the poster child for the proposition that patents foster accelerated rates of innovation. This sentiment stems, in large part, from the significantly high research and development (R&D) costs endemic to the pharmaceutical sector. I argue that if the role of the patent regime is one of fostering higher amounts of investment in the R&D process, it is better served by a direct investment protection regime, where the protection does not depend upon whether or not the underlying idea behind the drug is 'new' and 'inventive', the two central tenets of patent law. Rather, any drug that successfully makes it past the regulatory filter ought to be entitled to protection, since its discovery and development entail significant investment and risk. Owing to the inadequacy of the current patent regime in appropriately protecting intensive pharmaceutical R&D investments from free-riders, I propose a comprehensive investment protection regime that protects all the investment costs incurred during the drug discovery and development process. Though similar to existing data protection regimes in some respects, it differs in others. Firstly, it enables a recovery of all R&D costs, and not only costs associated with clinical trials. Secondly, unlike patents and data exclusivity which offer uniform periods of protection, it rewards investments in a proportionate manner, wherein drug originators are entitled to protection against free-riders only until such time as they recoup their specific investments and earn a rate of return on investment that is dependent on the health value of the drug. Given that a pure market exclusivity based investment protection regime is likely to foster excessive pricing and subject the market to the dictates of a single firm, I advocate a compensatory liability model based on a novel cost sharing methodology, where follow-on entrants are free to manufacture the drug, but must pay a reasonable amount of compensation to the originator.
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Sugden, Christopher Michael Gordon. "The practical accomplishment of novelty in the UK patent system." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:2ef0fd06-dcd8-4b21-8ef8-ab914d8de15f.
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Novelty is a widespread notion that has not been given commensurate critical attention. This research is an ethnographically-inclined exploration of practices surrounding the accomplishment of novelty in an institution for which novelty is a central notion: the patent system of the United Kingdom. The research is based on interviews with patent examiners at the UK patent office, interviews with patent attorneys at various legal firms, and documentary analysis of legislation and numerous legal judgments. The thesis brings to bear themes from Science and Technology Studies and ethnomethodology to assess the extent to which they can account for the practices surrounding novelty in the UK patent system. As a fundamental legal requirement for the patentability of inventions, novelty is a central part of the practices of patent composition, assessment and contestation. Rather than being a straightforward technical criterion, however, novelty is shown to be a complex and heterogeneous phenomenon emerging from interwoven legal, bureaucratic and individual practices. The local resolution of whether or not a given invention is new, and the cross-institutional coherence of novelty as a practicable notion, raise questions concerning ontology, accountability, scale and inconcludability, and provide an opportunity for empirically grounded engagement with these longstanding analytical concerns.
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Wallberg, Alexander. "Design and construction of a bidirectional DC/DC converter." Thesis, Uppsala universitet, Elektricitetslära, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-385240.
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A four quadrant general single-phase bi-directional DC/DC converter was designed and constructed for high effect systems. The target application for the DC/DC converter was to be used to transfer energy between different energy storages, a miniature DC power grid and the high voltage AC power city grid. The converter is capable of step-up and step-down operations in both directions i.e. it is bi-directional at varying voltage levels. Different DC/DC topologies were investigated, and thereafter simulations were performed in LTspice and Simulink to ensure its capabilities and functionalities. The result of the simulations was a two layered PI-regulator, controlling both the external DC-grid voltage and inductor current through the converter. Once a suitable topology and control strategy was found, a suitable power transistor investigated and a PCB driver card were developed with KiCad. The final converter is capable to seamlessly change between its four modes and controlling voltages up to 1200 V and currents up to 200 A.
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Mojtahedi, Sina. "Analyzing Efective Connectivity Of Brain Using Fmri Data : Dcm And Ppi." Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615496/index.pdf.
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In neuroscience and biomedical engineering fields, one of the most important issues nowadays is finding a relationship between different brain regions when it is stimulated. Connectivity is an important research area in neuroscience which tries to determine the relationship between different brain region when the brain is stimulated externally or internally. Three main type of connectivity are discussed in this field: Anatomical, Functional and Effective connectivity. Importance of effective connectivity is its ability to detect brain disorders in early stages. Some brain disorders are Schizophrenia, MS and Major Depression disease. Comparing the effective connectivity between a healthy and unhealthy brain will help to diagnose brain disorder. In this master study, two methods named Dynamic Causal Modeling (DCM) and Psychophysiological Interaction (PPI) are used to compare effective connectivity and neuronal activity between different regions of brain when there are three different stimulations. Since the neural activity is latent in fMRI data, there is a need to a model which is able to transfer data from neuronal level to a visible data like Blood-Oxygen level dependent (BOLD) signal. DCM uses a haemodynamic balloon model (HD) to represent this data transfer. The hemodynamic model must be so that the parameters of neural and BOLD signal be the same. It should be noted that what is looked for is not the BOLD signal but the neuronal activity. In this study, as the first step, we did preprocessing of MR images and after ROI`s are created using the program MARSBAR. Ten ROIs, which are thought to have connections between them are selected by considering the stimulations used in the experiments in obtaining the data used in this thesis. The data used contains fMRI images of 11 healthy subjects. Stimulations of experiment are applied to images got from group analysis of 11 healthy subjects. These Stimulations are then used in preparing the design matrix and the parameters related to DCM. These parameters are the values related to connection matrices defining bilinear dynamic model on ROI. Bayesian method is used to select best model between all these models. Another method of PPI is also applied to analyze effective connectivity between 10 ROIs. This method considers two issues of physiological and psychological effects. Like DCM, the preprocessing steps and ROI selection is done for PPI and hemodynamic model is designed for this method. Neural and hemodynamic responses of ROIs are compared using this method.
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Pepper, Michael. "BI-DIRECTIONAL DCM DC-TO-DC CONVERTER FOR HYBRID ELECTRIC VEHICLES." Master's thesis, University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2672.
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With the recent revival of the hybrid vehicle much advancement in power management has been made. The most popular hybrid vehicle, the hybrid electric vehicle, has many topologies developed to realize this hybrid vehicle. From these topologies, as sub set was created to define a particular group of vehicles where the converter discussed in this thesis has the most advantage. This sub set is defined by two electric sources of power coupled together at a common bus. This set up presents many unique operating conditions which can be handled seamlessly by the DC-to-DC converter when designed properly. The DC-to-DC converter discussed in this thesis is operated in Discontinuous Conduction Mode (DCM) of operation because of its unique advantages over the Continuous Conduction Mode (CCM) operated converter. The most relevant being the reduction of size of the magnetic components such as inductor, capacitor and transformers. However, the DC-to-DC converter operated in DCM does not have the inherent capability of bi-directional power flow. This problem can be overcome with a unique digital control technique developed here. The control is developed in a hierarchical fashion to separate the functions required for this sub set of hybrid electric vehicle topologies. This layered approach for the controller allows for the seamless integration of this converter into the vehicle. The first and lowest level of control includes a group of voltage and controller regulators. The average and small signal model of these controllers were developed here to be stable and have a relatively fast recovery time to handle the transient dynamics of the vehicle system. The second level of control commands and organizes the regulators from the first level of control to perform high level task that is more specific to the operation of the vehicle. This level of control is divided into three modes called hybrid boost, hybrid buck and electric vehicle mode. These modes are developed to handle the specific operating conditions found when the vehicle is operated in the specific mode. The third level of control is used to command the second level of control and is left opened via a communication area network (CAN) bus controller. This level of control is intended to come from the vehicle s system controller. Because the DC-to-DC converter is operated in DCM, this introduces added voltage ripple on the output voltage as well as higher current ripple demand from the input voltage. Since this is generally undesirable, the converter is split into three phases and properly interleaved. The interleaving operation is used to counteract the effects of the added voltage and current ripple. Finally, a level of protection is added to protect the converter and surrounding components from harm. All protection is designed and implemented digitally in DSP.M.S.E.E.
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering MSEE
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Khan, M. (Md). "Impact of digital content marketing (DCM) on customers’ online purchasing behavior." Master's thesis, University of Oulu, 2019. http://jultika.oulu.fi/Record/nbnfioulu-201905081642.
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Abstract. This study aims to understand how digital contents are acting as a motivating factor to influence on customers online purchasing behavior as well as online purchasing process. More clearly this study will understand and analyze the phenomenon closely on how digital contents are influencing customers into customers five stages of the online purchasing process.
The theoretical framework is formed during the study which is based on the findings of previous researches related to digital content marketing and online purchasing behavior.
The research is conducted on the qualitative method where semi-structured interview is applied for data collection. The target age group for data collection is 25 to 34 who purchase mostly electronic products from the online marketplace. The empirical analysis is done based on abductive reasoning approach.
The finding of the study shows that digital contents affect on customers online purchasing process. The research also found that the right structure and strategy should be applied to create and distribute digital content which engages customers towards digital contents and motivate them to rely on digital contents into the online purchasing decision-making process.
Finally, the study showed theoretical contributions, managerial implications, and suggestions for further research regarding digital contents.
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Сигида, Любов Олексіївна, Любовь Алексеевна Сигида, Liubov Oleksiivna Syhyda, and Н. О. Сигида. "SCM, DCM, SSCM ТА SDCM як сучасні концепції діяльності промислових підприємств." Thesis, Сумський державний університет, 2017. http://essuir.sumdu.edu.ua/handle/123456789/66723.
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Однією з нових концепцій, що набула поширення з середини ХХ ст., є
концепція управління ланцюгами поставок (Supply Chain Management –
SCM). Особливу актуальність поширення цієї концепції можна пояснити
загостренням конкуренції між виробниками продукції і, як наслідок,
необхідність формування ними додаткових конкурентних переваг.
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Carter, Matthew Edward. "Setting location priors using beamforming improves model comparison in MEG-DCM." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/50418.
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Modelling neuronal interactions using a directed network can be used to provide insight into
the activity of the brain during experimental tasks. Magnetoencephalography (MEG) allows
for the observation of the fast neuronal dynamics necessary to characterize the activity of
sources and their interactions. A network representation of these sources and their con-
nections can be formed by mapping them to nodes and their connection strengths to edge
weights. Dynamic Causal Modelling (DCM) presents a Bayesian framework to estimate the
parameters of these networks, as well as the ability to test hypotheses on the structure of
the network itself using Bayesian model comparison. DCM uses a neurologically-informed
representation of the active neural sources, which leads to an underdetermined system and
increased complexity in estimating the network parameters. This work shows that inform-
ing the MEG DCM source location with prior distributions defined using a MEG source
localization algorithm improves model selection accuracy. DCM inversion of a group of can-
didate models shows an enhanced ability to identify a ground-truth network structure when
source-localized prior means are used.Master of Science
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Santer, Roger D. "The role of the DCMD neuron in triggering emergency avoidance reactions in locusts and robots." Thesis, University of Newcastle Upon Tyne, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289095.
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Rong, Alena [Verfasser]. "Mechanodynamics of cardiomyocytes in the context of dilated cardiomyopathy (DCM) / Alena Rong." Greifswald : Universitätsbibliothek Greifswald, 2016. http://d-nb.info/1080935487/34.
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Souza, Juliana Alles de Camargo de. "O infográfico e a divulgação científica midiática (DCM): (entre) texto e discurso." Universidade do Vale do Rio dos Sinos, 2012. http://www.repositorio.jesuita.org.br/handle/UNISINOS/4460.
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UNISINOS - Universidade do Vale do Rio dos Sinos
O infográfico tem sido amplamente utilizado em diversas situações comunicativas que envolvem diversos campos do conhecimento, em especial, no domínio midiático. No âmbito da Divulgação da Ciência na Mídia (DCM), destaca-se o infográfico que se orienta para as visadas do fazer-saber e fazer-compreender ciência, marcado pelo fazer-sentir promovido pela plasticidade das cores, das formas e das topografias utilizadas. Mesmo assim, são escassos os trabalhos de investigação sobre esse texto sincrético (em que imagem e palavra, simultaneamente, produzem o sentido). Consequentemente, foram encontrados, desde o início desta pesquisa, apenas estudos no campo do periodismo, na Comunicação. Por esse motivo, esta tese objetiva investigar o infográfico do ponto de vista discursivo-linguístico, fundamentando a ação nas teorias Semiolinguística e Linguística Textual, suplementadas pelos aportes epistêmicos da Semiótica Plástica. Esta possibilita analisar a imagem e integra a visão da Linguística focalizada nesse texto ancestral e contemporâneo da comunicação humana. Especificamente, objetiva-se analisar como se configuram os processos constitutivos da tessitura linguística da infografia, uma vez que os mecanismos de linguagem verbal e visual apontam para ações descritivas, narrativas e explicativas. Integram o percurso metodológico, primeiro, a constituição de um corpus de 58 textos infografados, isolados ou inseridos em matérias mais extensas, das revistas de divulgação científica midiática "Superinteressante", "Saúde! é vital" e "Mundo Estranho", selecionados entre agosto de 2008 e dezembro de 2009; segundo, o exame de aspectos discursivo-textuais de cada infográfico, compondo uma tabela de anotações revisada a cada semestre dos anos da elaboração da tese. Dessa observação e desses procedimentos, levantaram-se teorias que pudessem esclarecer a composição do infográfico DCM, o que implica assumir o caráter qualitativo da metodologia. Anotam-se os seguintes resultados: o infográfico da DCM se revela descritivo verbovisualmente; essa feição descritiva possibilita ancorar ações narrativas (em menor escala) e oportuniza, na grande maioria dos textos examinados, explicações sobre fenômenos, objetos e fatos, tanto em sequências explicativas quanto em fins ilocutórios dos textos, relacionados à ciência ou à tecnologia. Por consequência, a infografia tem um papel destacado nas explicações complexas, já que a verbovisualidade promove a otimização informativa (faz-saber e faz-compreender). Conclusivamente, é possível categorizar o infográfico como um texto relevante do letramento verbal, científico e visual e sustentar que as pesquisas sobre essa forma de produzir sentidos em texto são significativas para ações educativas, previstas, inclusive, nos Parâmetros Curriculares Nacionais (PCNs), e em projetos ou programas de letramento em diversas áreas de conhecimento humano.
Infographics have been largely used in several communicative situations that involve different knowledge areas, especially in the media domain. In the context of the Divulgation of Science in the Media (DSM), the infographic that contemplates the dimensions of the know-how and of the make-comprehend science, marked by the make-feel promoted by the plasticity of the colors, shapes and topography used in the diagram is highlighted. To the best of our knowledge, there are few studies about this syncretic text (in which image and word, simultaneously, produce the comprehension). Consequently, since the beginning of this research only studies in the field of journalism were found, related to Communication Sciences. For this reason, this thesis aims at investigating the infographic from a discursive-linguistic point of view based on the Semiolinguistic and Textual Linguistics theories supplemented by epistemic contributions of the Plastic Semiotics. The latter enables the analysis of the image and integrates the Linguistics perspective focused in this ancestral and contemporary text of the human communication. Specifically, the main aim of this study is to analyze what is the configuration of the processes that constitute the linguistic organization of the infographics taking into consideration that the mechanisms of the verbal and visual language point to descriptive, narrative and explanatory actions. As part of the methodological path, the first step was the collection of a corpus of 58 infographic texts, isolated or inserted in longer articles of scientific divulgation magazines in the media such as “Superinteressante”, “Saúde! é vital” and “Mundo Estranho”. The texts were selected between August 2008 and December 2009. In a second step, an analysis of the discursive-textual aspects of each infographic was performed, compounding an annotation table that was reviewed each semester during the thesis development period. From this observation and using these procedures, different theories that can clarify the composition of the DSM infographic were elaborated, which implies in assuming the qualitative characteristic of the methodology. The following results were noted: the DSM infographic reveals itself as a descriptive tool in the verbal dimension as well as in the visual dimension. Such descriptive feature enables the anchorage of narrative actions (to a lesser extent) and creates the possibility of explanations, in a greater number of the texts analyzed, about phenomena, objects and facts, both in explanatory sequences and in ilocutory aims of texts, related to science or technology. Consequently, infographics have an important role in complex explanations, as verbal and visual aspects promote an informative optimization (make-know and make-comprehend). In conclusion, it is possible to classifiy the in fographic as a relevant text of the verbal, scientific and visual literacy. Furthermore, it carries out that researches about this form of producing comprehension in a text are significant for educational actions, foreseen in the “Parâmetros Curriculares Nacionais” (PCNs) and in literacy projects or programs in several areas of the human knowledge.
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Chen, Rui. "Analysis and Design of a DCM SEPIC PFC with Adjustable Output Voltage." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/51664.
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Power Factor Correction rectifiers are widely adopted as the first stage in most grid-tied power conversion systems. Among all PFC converts for single phase system, Boost PFC is the most popular one due to simplicity of structure and high performance. Although the efficiency of Boost PFC keeps increasing with the evolution of semiconductor technology, the intrinsic feature of high output voltage may result cumbersome system structure with multiple power conversion stages and even diminished system efficiency. This disadvantage is aggravated especially in systems where resonant converters are selected as second stage.
Especially for domestic induction cooker application, step-down PFC with wide range output regulation capability would be a reasonable solution, Conventional induction cooker is composed by input filter, diode-bridge rectifier, and full bridge or half bridge series resonant circuit (SRC). High frequency magnetic field is induced through the switching action to heat the pan. The power level is usually controlled through pulse frequency modulation (PFM). In such configuration, first, a bulky input differential filter is required to filter out the high frequency operating current in SRC. Second, as the output power decreases, the operating point of SRC is moved away from the optimum point, which would result large amount circulating energy. Third, when the pan is made of well conducting and non-ferromagnetic material such as aluminum, due to the heating resistance become much smaller and peak output voltage of the switching bridge equals to the peak voltage of the grid, operating the SRC at the series resonant frequency can result excessive current flowing through the switch and the heating coil. Thus for pan with smaller heating resistance, even at maximum power, the operating frequency is pushed further away from the series resonant point, which also results efficiency loss.
To address these potential issues, a PFC circuit features continuous conducting input current, high power factor, step-down capability and wide range output regulation would be preferred. The Analysis and design work is present in this article for a non-isolated hard switching DCM SEPIC PFC. Due to DCM operation of SPEIC converter, wide adjustable step-down output voltage, continuous conduction of input current and elimination of reverse recovery loss can be achieved at same time.
The thesis begins with circuit operation analysis for both DC-DC and PFC operation. Based on averaged switching model, small signal model and corresponding transfer functions are derived. Especially, the impact from small intermediate capacitor on steady state value are discussed.
With the concept of ripple steering, theoretic analysis is applied to SEPIC converter with two coupled inductors. The results indicate if the coupling coefficient is well designed, the equivalent input inductance can be multiple times larger than the self-inductance. Because of this, while maintaining input current ripple same, the two inductors of SEPIC can be implemented with two smaller coupled inductors. Thus both the total volume of inductors and the total number of windings can be reduced, and the power density and efficiency can be improved. Based on magnetic reluctance model, a corresponding winding scheme to control the coupling coefficient between two coupled inductors is analyzed. Also the impact of coupled inductors on the small signal transfer function is discussed.
For the voltage follower control scheme of DCM PFC, single loop controller and notch filter design are discussed. With properly designed notch filter or the PR controller in another word, the closed loop bandwidth can be increased; simple PI controller is sufficient to achieve high power factor; THD of the input current can be greatly reduced.
Finally, to validate the analysis and design procedure, a 1 kW prototype is built. With 120 Vrms AC input, 60V to 100V output, experimental results demonstrate unity power factor, wide output voltage regulation can be achieved within a single stage, and the 1 kW efficiency is around 93%.Master of Science
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Monteiro, e. Lima Margareth de Vasconcelos. "Eye-hand co-ordination in children with movement problems." Thesis, University of Reading, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326711.
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Gall, Jonathan Henrik. "Zero-Voltage-Switching PWM Full-Bridge Converter for Onboard Charging of Battery of Electric Vehicles." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.
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This thesis gives a description of working principles of a Phase-Shifted Full-Bride PWM ZVS converter using a Full-Wave rectifying output as well as a Double Current Rectifier. After a description of each topology and some differences between the two topologies, a hybrid solution is presented. The hybrid configuration is a combined FW and DCR, in an interleaved connection. By the opening and closing of a switch that is located between the two output stages, either a DCR-DCR or DCR-FW rectifying output stage is used for the converter. This allows for dynamic turns ratio of the step-up transformer of the converter, as well as reduced primary and secondary side currents.
The voltage for when to switch between the two output configurations is derived analytically. Simulations carried out in LTSpice to verify the analytical results and the hypothesis of reduced currents and losses are presented in the end.
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Ying, Hua. "Functional Analyses of Human Serum Paraoxonase1 (HuPON1) Mutants Using Drop Coating Deposition Raman Difference Spectroscopy." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1284657860.
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梁景雄 and King-hung Daniel Leung. "Investigation of metal-metal bonding interactions of initially excitedstate associated with d * p transitions in Pt2(P2O5H2)44-, M2(dcpm)2(M=Au,Ag,Cu) and M2(dmpm)3 (M=Au,Cu) (dcpm=bis(dicyclohexylphosphine)methane) inorganic complexes." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31240525.
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Eilers-König, Nina. "Ultrafast relaxation after photoexcitation of the dyes DCM and LDS-750 in solution." [S.l. : s.n.], 1999. http://deposit.ddb.de/cgi-bin/dokserv?idn=959457828.
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ORTIGA, SERGIO RICARDO BATULI MAYNOLDI. "DCD TOOL: A TOOLKIT FOR THE DISCOVERY AND TRIPLIFICATION OF STATISTICAL DATA CUBES." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2013. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=24871@1.
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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIROCOORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
PROGRAMA DE EXCELENCIA ACADEMICA
A produção de indicadores sociais e sua disponibilização na Web é uma importante iniciativa de democratização e transparência que os governos em todo mundo vêm realizando nas últimas duas décadas. No Brasil diversas instituições governamentais ou ligadas ao governo publicam indicadores relevantes para acompanhamento do desempenho do governo nas áreas de saúde, educação, meio ambiente entre outras. O acesso, a consulta e a correlação destes dados demanda grande esforço, principalmente, em um cenário que envolve diferentes organizações. Assim, o desenvolvimento de ferramentas com foco na integração e disponibilização das informações de tais bases, torna-se um esforço relevante. Outro aspecto que se destaca no caso particular do Brasil é a dificuldade em se identificar dados estatísticos dentre outros tipos de dados armazenados no mesmo banco de dados. Esta dissertação propõe um arcabouço de software que cobre a identificação das bases de dados estatísticas no banco de dados de origem e o enriquecimento de seus metadados utilizando ontologias padronizadas pelo W3C, como base para o processo de triplificação.
The production of social indicators and their availability on the Web is an important initiative for the democratization and transparency that governments have been doing in the last two decades. In Brazil, several government or government-linked institutions publish relevant indicators to help assess the government performance in the areas of health, education, environment and others. The access, query and correlation of these data demand substantial effort, especially in a scenario involving different organizations. Thus, the development of tools, with a focus on the integration and availability of information stored in such bases, becomes a significant effort. Another aspect that requires attention, in the case of Brazil, is the difficulty in identifying statistical databases among others type of data that share the same database. This dissertation proposes a software framework which covers the identification of statistical data in the database of origin and the enrichment of their metadata using W3C standardized ontologies, as a basis for the triplification process.
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Peters, Judith M. "Developmental Coordination Disorder (DCD) as a distinct syndrome : a conceptual and empirical investigation." Thesis, University College London (University of London), 2006. http://discovery.ucl.ac.uk/10007440/.
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Bright children who have abnormal difficulty in acquiring age-appropriate motor skills are of increasing concern to parents, teachers and health professionals. Longitudinal studies have found the condition to be associated with educational under-achievement, impaired social development and disturbed mental well-being in adult life. Now officially known as Developmental Coordination Disorder (DC D), the question of whether this condition should really be viewed as a distinct diagnostic entity is the central theme of this thesis. In the opening chapters, the history of terms used to signify 'clumsiness' of movement is reviewed and the different implications of treating such behaviour as a symptom or syndrome is considered. Discussion then moves to the overlap between DCD and other childhood conditions and the question of how these should be conceptualised. Five studies comprising the empirical component of the thesis employed a variety of methodologies. Two questionnaire-based studies showed that in this area, neither consensus on terms nor equitable service provision has yet been achieved. A third, retrospective study, searched for evidence of sub-types within a large sample of DCD children, successfully replicating some of the cluster groups reported by others. In a final, prospective study, a two-stage identification process was followed by 'blind' assessment of boys with DCD, Asperger Syndrome or Joint Hyper-mobility Syndrome. Novel to this area was the inclusion of experimental measures, including dual-task performance, in which motor and cognitive tasks were combined. The results showed that although the group with AS were significantly poorer on ball skills than those with OCD, the general nature of motor difficulties was not systematically constrained by diagnosis. Together, these studies support the thesis that DCD exists as a separable syndrome, but bear less decisively on the existence of subtypes. A series of real-life case studies illustrates the problems associated with differential diagnosis and the implications for appropriate intervention.
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Eilers-König, Nina. "Ultrafast relaxation after photoexcitation of the dyes DCM and LDS-750 in solution." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 1999. http://dx.doi.org/10.18452/14468.
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Die Relaxation der Styrylfarbstoffe DCM und LDS-750 nach Photoanregung in flüssiger Phase wurde mittels zeitaufgelöster optischer Spektroskopie untersucht. Dabei wurde die Breitband-Pump-Probe-Technik angewandt. Zur Charakterisierung der Relaxation von DCM im elektronischen Grundzustand wurde außerdem die Breitband-Dump-Probe-Technik (stimuliertes Emissionspumpen) eingesetzt. Für die beobachtete schnelle Relaxation von DCM wurde eine annähernd lösungsmittelunabhängige Zeitkonstante von 0.23 (( 0.04) ps im elektronisch angeregten und von 0.28 (( 0.07 ps) im elektronischen Grundzustand gefunden. Sie wurde als Konforma tionsänderung mit nur geringer Ladungsverschiebung charakterisiert. Die weitere spektrale Entwicklung wird in polarer Lösungsmittelumgebung vorwiegend von der Solvatation bestimmt. Für das ionische Polymethin LDS-750 wurden nach der Anregung solvensabhängige Kinetiken beobachtet, die sich durch die Annahme dreier möglicher Konformationen im S1 erklären lassen.Relaxation of the stryryl dyes DCM and LDS-750 after photoexcitation in the liquid phase has been investigated by means of time-resolved optical spectroscopy. For this purpose, the broadband pump-probe technique was used. To characterize the relaxation of DCM in the electronic ground state, additionally the broadband dump-probe technique (stimulated emission pumping) was applied. An approximately solvent-independent time constant was found typical for the observed fast relaxation of DCM, with values of 0.23 ((0.04) ps in the excited and 0.28 (( 0.07 ps) in the electronic ground state. The relaxation was characterized as conformational change with only a small amount of charge transferred. The further spectral evolution in polar solvents was dominated by solvation dynamics.For the ionic polymethine species LDS-750 solvent-dependent kinetics were found after photoexcitation. They could be accounted for by assuming the existence of three different conformers within the S1 state.
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Leung, King-hung Daniel. "Investigation of metal-metal bonding interactions of initially excited state associated with d * p transitions in Pt2(P2O5H2)44-, M2(dcpm)2 (M=Au, Ag, Cu) and M2(dmpm)3 (M=Au, Cu) (dcpm= bis(dicyclohexylphosphine)methane) inorganic complexes /." Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B21490272.
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Souza, Anamélia Contente de. "Implementando aplicações distribuídas utilizando CORBA e DCOM: um estudo de caso voltado à área de banco de dados." Florianópolis, SC, 1999. http://repositorio.ufsc.br/xmlui/handle/123456789/80755.
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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro TecnológicoMade available in DSpace on 2012-10-18T18:56:22Z (GMT). No. of bitstreams: 0Bitstream added on 2016-01-09T04:31:17Z : No. of bitstreams: 1 177491.pdf: 7142788 bytes, checksum: e40954b2aae4c3d0ca10a211dd1a2366 (MD5)
Este trabalho apresenta um estudo de plataformas para o desenvolvimento de aplicações distribuídas,em particular as arquiteturas CORBA e DCOM. O objetivo perseguido neste estudo é a realização de um aplicativo sobre ambas arquiteturas, visando observar os seus desenvolvimentos diante de uma situação real
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Rivera, Marcela. "Reconfiguration and life-cycle distributed components : asynchrony, coherence and verification." Nice, 2011. http://www.theses.fr/2011NICE4125.
Full textAbstract:
En programmation orientée à composants, mais particulièrement dans des environnements distribués, les composants ont besoin d’être adaptatifs. Une majeure partie de cette adaptation repose sur la reconfiguration dynamique. Dans cette thèse, nous introduisons une nouvelle approche pour la reconfiguration des modèles de composants distribués, avec l’objectif de faciliter le processus de reconfiguration et d’assurer la consistance et la cohérence du système. Avant d’exécuter une reconfiguration, il est nécessaire que les composants soient dans un état cohérent et stable, afin d’éviter des incohérences dans le processus de reconfiguration. Pour ceci, nous concevons un algorithme pour l’arrêt d’un composant d’une manière sécurisée et atteignant un état stable. Cela a été réalisé en mettant en œuvre un mécanisme de marquage et d’interception qui permet d’ajouter des informations aux requêtes et de manipuler leurs flux, afin de décider lesquelles doivent être servies avant d’arrêter le composant. Nous avons conçu un ensemble de primitives de reconfiguration de haut niveau qui permettent de réaliser des opérations de reconfiguration plus complexes. Nous fournissons un contrôleur supplémentaire à notre modèle de composant qui implémente ces primitives. Pour le déclenchement des tâches de reconfiguration, nous avons étendu le langage FScript pour lui permettre d’exécuter des reconfigurations distribuées, en déléguant certaines actions à des composants. Pour ceci, nous avons défini un contrôleur additionnel à l’intérieur de la membrane des composants. Nous avons testé notre approche sur deux applications basées sur GCM/ProActive : CoCoME et TurnTableFor component programming, but even more specifically in distributed and Grid environments, components need to be highly adaptive. A great part of adaptativeness relies on dynamic reconfiguration of component systems. We introduce a new approach for reconfiguring distributed components with the main objective to facilitate the reconfiguration process and ensure the consistency and coherence of the system. First, before executing a reconfiguration it’s necessary that the components are a coherent and quiescent state. This is done to avoid inconsistency in the reconfiguration process. To achieve this, we design an algorithm for stopping a component in a safe manner and reach this quiescent state. This was realized by implementing a tagging and interception mechanisms that adds information to the requests and manipulates their flow in order to decide which of them must be served before stopping the component. Next, we designed a set of high-level reconfiguration primitives to achieve more complex reconfiguration operations. These primitives include : add, remove, duplicate, replace, bind, and unbind. We provide an additional controller to our component model which implements these primitives. Additionally, for triggering the reconfiguration tasks, we extended the FScript language to give it the capability of executing distributed reconfiguration actions, by delegating some actions to specific components. To achieve this objective, we defined an additional controller inside the membrane of the components. We tested our implementation over two GCM/Pro Active based applications : the CoCoME example and the TurnTable example
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Halvorson, Rebecca Ann. "Raman Spectroscopy for Monitoring of Microcystins in Water." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/76924.
Full textAbstract:
Cyanobacterial blooms are of great concern to the drinking water treatment industry due to their capacity to produce microcystins and other cyanotoxins that are deadly to humans, livestock, pets, and aquatic life at low doses. Unfortunately, the strategies currently employed for cyanotoxin detection involve laborious analyses requiring significant expertise or bioassay kits that are subject to numerous false positives and negatives. These methods are incapable of providing rapid, inexpensive, and robust information to differentiate between the >80 cyanotoxin variants potentially present in an aqueous sample.
The use of Raman spectroscopy for identification and quantification of the ubiquitous cyanotoxin microcystin-LR (MC-LR) was examined. Raman spectra readily reflect minute changes in molecular structure, spectra can be collected through water or glass, portable Raman spectrometers are increasingly available, and through surface enhanced Raman spectroscopy (SERS) it is possible to achieve femto or picomolar detection limits for a variety of target species. Drop coating deposition Raman (DCDR) was successfully implemented for quantitation of 2-100 ng of MC-LR deposited in 2 ?L of aqueous sample, even without the use of a specifically designed DCDR substrate or Raman signal enhancements. Reproducible MC-LR Raman spectra were observed for both fresh and aged DCDR samples, and the MC-LR Raman spectrum remained identifiable through a matrix of >80% DOM by mass. DCDR methods show tremendous potential for the rapid, simple, and economical detection of cyanotoxins in environmental matricies at environmentally relevant concentrations.Master of Science
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Parvatiyar, Michelle S. "Predicting Cardiomyopathic Phenotypes by Altering the Calcium Affinity of Cardiac Troponin C." Scholarly Repository, 2009. http://scholarlyrepository.miami.edu/oa_dissertations/292.
Full textAbstract:
Cardiac diseases associated with mutations in Tn subunits include hypertrophic cardiomyopathy (HCM), dilated cardiomyopathy (DCM) and restrictive cardiomyopathy (RCM). Altered calcium handling in these diseases is evidenced by changes in the Ca2+ sensitivity of contraction. Mutations were generated to increase/ decrease the Ca2+ sensitivity of skinned fibers, and create the classified effects of DCM, HCM and RCM. This study mimicked the changes in Ca2+ sensitivity and relaxation properties of the muscle to determine if this was sufficient to recreate the disease. Four mutants (A23Q, S37G, V44Q, L48Q) were identified with RCM-like properties; a large increase in Ca2+ sensitivity, increased basal force and loss of ATPase inhibition. Two mutations were identified (E40A, I61Q) with DCM properties; decreased Ca2+ sensitivity in skinned fibers, decreased force recovery (%), and decreased activation of the ATPase at high Ca2+ levels (pCa 6-4). Also, the functional effects of four newly identified cTnC mutations associated with HCM were reported. Three of these HCM mutations A8V, C84Y, and D145E displayed HCM characteristics, increased Ca2+ sensitivity in skinned fibers and ATPase and A8V and D145E increased the force recovery. Only, D145E significantly increased the ATPase activation of the reconstituted thin filament. Also, Ca2+ affinity measurements using IAANS fluorescence were performed. No significant changes were found for E134D. The C84Y IAANS fluorescence measurements revealed that cTnC Ca2+ affinity of the cTn complex was unaltered. The Ca2+ affinity increased for D145E in isolated cTnC and the cTn complex, however in the regulated thin filament (RTF) with myosin subfragment-1 (S1) and rigor crossbridges the Ca2+ affinity values were similar to the fiber Ca2+ sensitivity. For A8V, the RTF significantly increased the Ca2+ affinity, and addition of S1 and rigor crossbridges caused the values to parallel the Ca2+ sensitivity values. In conclusion, direct and indirect protein-protein interactions contribute to the enhanced Ca2+ sensitivity of the HCM mutants. The cTnC mutant screen allowed selection of mutations that mimic the disease states: S37G (RCM) and, E40A (DCM); A8V (HCM) from the patient study for analysis in knock-in mice for futures studies to determine if these disease states can be recapitulated in vivo.
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Souza, Jaqueline de. "Mudanças relacionadas à idade nos ajustes posturais compensatórios em crianças com e sem DCD." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2006. http://hdl.handle.net/10183/10723.
Full textAbstract:
O presente estudo investigou as mudanças relacionadas à idade nos ajustes posturais compensatórios em crianças com e sem Desordem Coordenativa Desenvolvimental (DCD). Os ajustes posturais compensatórios foram investigados em 105 crianças (5-12 anos de idade) que foram selecionadas a partir de 538 crianças no sul do Brasil. As crianças com DCD foram definidas como aquelas com escores abaixo do 5º percentil no Teste Movement ABC. As crianças com desenvolvimento típico (DT) foram aquelas cujos escores no teste foram acima do 30º percentil (52 crianças). Os sujeitos foram solicitados a permanecerem em pé ereto sobre uma plataforma de força e a executar um movimento rápido alvo direcionado com o membro superior direito. O tempo de movimento e os erros absolutos do movimento do braço e também a amplitude e direção das mudanças do centro de pressão foram mensuradas. O resultado mostrou mudanças relacionadas à idade nos ajustes posturais compensatórios e, tempo de movimento, significativos em ambos os grupos. As crianças com DT mostraram mudanças com a idade significativas sobre a direção e amplitude do centro de pressão (COPy), sugerindo que eles melhoram suas habilidades para ajustar o equilíbrio quando realizando um movimento voluntário do membro superior com a idade, pelo uso do seu feedback. Crianças com DCD mostraram grandes amplitudes médio-laterais e tempo de movimento, quando comparadas com as crianças com DT. Uma correlação forte e positiva foi encontrada entre a amplitude do centro de pressão e o tempo de movimento em crianças com DCD sugerindo que os atrasos no movimento, frequentemente observados na criança com DCD, poderia ser causada por déficits posturais. Nós concluímos que a tendência desenvolvimental dos ajustes posturais compensatórios nas crianças com DCD é semelhante à criança com DT.The present study investigated age-related changes of compensatory postural adjustments in children with and without Developmental Coordination Disorder (DCD). Compensatory postural adjustments were investigated in 105 children (5-12 years old) screened from 538 children in the south of Brazil. Children with DCD were defined as those with scores at or below the 5th (53 Children) percentile on Movement ABC Test. Typically developing children (TD) were those whose scores on the test were above the 30th percentile (52 children). Subjects were asked to stand upright and still on the force platform and perform a quick goal movement directed with the right superior limb. Movement time and absolute error of the arm movement and also amplitude and direction changes of the center of pressure were measured. The results showed significant age-related changes in the compensatory postural adjustments and movement time in both groups. TD children showed significant age-related changes on direction and amplitude of center of pressure (COPy), suggesting that they improve their ability to adjust their balance when performing an arm voluntary movements with the age by using their feedback. Children with DCD showed larger medium-lateral amplitudes and movement times as compared with TD children. A positive and well correlation found between center of pressure amplitude and movement time in children with CD suggests that the movements delays, often observed in children with DCD, could be caused by postural deficits. We conclude that the development trend of compensatory postural adjustments in children with DCD is similar to TD children.
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Bjørhei, Eivind. "Beregning av plastiske ledd og overstyrke i betongskiver ved dimensjonering for jordskjelv i DCM." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for konstruksjonsteknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18799.
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Med innføring av eurokodene som enerådende standarder i Norge fra 1. april 2010 har dimensjonering for jordskjelv blitt mer aktuelt, da Eurokode 8 gir mer utvidede, detaljerte og presise krav enn forgjengeren NS 3491-12. Eurokode 8 gir i Norge mulighet til å redusere de seismiske kreftene på konstruksjonen ved å dimensjonere for middels duktilitet i duktilitetsklasse M - DCM. For en enkeltstående veggskive i armert betong kan de seismiske kreftene halveres, men grunnet krav til overstyrke i den ikke-duktile delen av skiven blir besparelsene ved å beregne i DCM i en del tilfeller likevel små.Overstyrken i veggskiver ved dimensjonering i DCM styres av den såkalte forskyvningen av strekkkraftlinjen, a1, i omhyllingskurven for momentdiagrammet til veggskiven og er gitt i punkt 5.4.2.4 i Eurokode 8. Eurokode 8 sier at denne kan forenkles til kritisk høyde, hcr , som bestemmes av vegglengde eller vegghøyde og begrenses av etasjehøyden. Ved å følge Eurokode 8s anbefalinger for kritisk høyde fås overstyrker i størrelsesorden 50-100 % og derfor er det ønskelig å finne et mer nøyaktig mål for denne.Forskyvningen av strekkraftlinjen tilsvarer utstrekningen av det plastiske leddet som dannes i overkant av fundamentet. Et forslag til et bedre mål for hcr er ekvivalent lengde av plastisk ledd, Lpl , pluss en avstand for å sikre elastisk oppførsel over den kritiske høyden: hcr=Lpl+? . For å se på utstrekningen av det plastiske området langs veggskiven er det foretatt ikke-lineære statiske beregninger på armerte veggskiver med elementmetodeprogrammet Abaqus. Det er sett på ekvivalent lengde av plastisk ledd for veggskiver med ulik veggtykkelse t og med varierende horisontal vegglengde lw og lengdearmeringsforhold ρsl . Resultatene er sammenlignet med tidligere studier. Det er også sett på utstrekning av full flyt i vertikalarmeringen.Resultatene av ekvivalent lengde av plastisk ledd stemmer godt med tidligere studier, men det må presiseres at resultatene fra de tidligere studiene har stor statistisk varians. For veggskivene som er studert i denne oppgaven er det i alle tilfeller stor overstyrke ved bruk av Eurokode 8s betraktning, som bekrefter at anbefalingene til hcr i Eurokode 8 er større enn nødvendig. Det er funnet god korrelasjon mellom ekvivalent lengde av plastisk ledd og vegglengde, men ikke for varierende veggtykkelse eller lengdearmeringsforhold. Det samme gjelder for utstrekning av full flyt i vertikalarmeringen. Begge har et stigningstall på ca 0,3lw, men full flyt i armeringen strekker seg i underkant av en halv meter lengre opp i skiven. Ut i fra dette kan det gis et nytt forslag til kritisk høyde, nemlig ekvivalent lengde av plastisk ledd pluss ett tillegg for differanse til full flyt i vertikalarmering: hcr = Lpl + differanse i avstand til full flyt i vertikalarmering.Resultatene i denne oppgaven viser at spesielt for veggskiver i bygg på tre til fire etasjer vil overstyrken med bruk av hcr fra Eurokode 8 bli meget stor. Det kan her lønne seg å gjøre en ikke-lineær beregning for å kunne spare armering langs hele veggskivens høyde.
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Nel, Rentia. "Die verband tussen ysterstatus en ontwikkelingskoördinasieversteuring (DCD) by nege- tot twaalfjarige kinders / Rentia Nel." Thesis, North-West University, 2004. http://hdl.handle.net/10394/604.
Full textAbstract:
The most common form of nutritional deficiency worldwide is iron deficiency, which is
associated with sup optimal early brain development. Literature indicates that children
with a poor nutritional status during early development of the brain showed poorer
cognitive functioning, deficient growth and muscle function.
The first purpose of this study was to determine if iron status plays a role in motor
competency. A second purpose was to determine if iron status shows an association
with motor competency, behavioural characteristics and scholastic success, while a third
purpose was to determine if the consumption of different teas will improve iron intake
positively and consequently will improve motor development and behaviour. A test- retest
research design was used in a randomised parallel study, with one group of children
drinking tea and a control group drinking 'rooibos' tea. The Movement Assessment
Battery for Children (MABC) (Henderson & Sugden, 1992) was used to determine the
DCD (Developmental co-ordination disorder) status in the group (N = 76). In this group,
45 children were classified as children with DCD. Blood samples were taken to
determine the haemoglobin, ferritin and transferrin saturation levels while a 24hr recall
dietary questionnaire was used to determine nutritional intakes. Descriptive statistics, t-testing,
effect sizes and analysis of co-variance were used to analyse the data.
With regards to the first aim of the study, the results which were analysed by means of
t-testing, effect sizes and co-variance of analysis indicated that iron deficiency showed
significant relationships with Developmental Coordination Disorder (DCD). When
corrected for influences other than haemoglobin on gross motor competency manual
dexterity, and especially ball skills, showed significant relationships with iron deficiency.
These results demonstrate the importance of proper nutrition on motor and cognitive
development.
With reference to the second aim of the study the assessment of children with DCD by
the teachers with regard to their manual dexterity and behavioural characteristics,
indicated poorer manual dexterity and more behavioural problems compared to children
without DCD. The children in the DCD group was also divided into a group where the
MABC-total showed improvement and their haemoglobin levels increased (n=19). This
group was then compared with a group of DCD children of which the MABC total
decreased and a decrease in haemoglobin was found (n=6). Although the groups were
small, the results indicate that manual dexterity skills and mathematics, reading and
writing was poorer in the DCD-children whose iron status decreased. No definite
association between the different teas and improvement of motor development and
behaviour were indicated by the results.
Overall, the conclusion can be made that a relationship between iron status and
Developmental Coordination Disorder (DCD) among 9-12 year old children exist.
However, it is recommended that more studies of this nature should be done on school
age children to substantiate the findings of this study. Intervention studies should also
be implemented where the children with depleted iron anaemia status should receive iron
supplementation.Thesis (M.Sc. (Human Movement Science))--North-West University, Potchefstroom Campus, 2005.
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PIDUTTI, ALBINO. "High Frequency Buck Converter for Automotive Current Source Applications." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2023. https://hdl.handle.net/10281/404716.
Full textAbstract:
Il presente lavoro e’ stato svolto in cooperation tra l’infineon e l’Universita’ Milano Bicocca, l’obbiettivo e’ sviluppare il cuore di un convertitore DC-DC Buck Converter ad alta frequenza di commutazione.
I convertitori a commutazione offrono un modo semplice ed efficiente per alimentare carichi elettronici. Inoltre, gli alimentatori DC-DC consentono di soddisfare efficacemente molti requisiti di sicurezza delle automobili moderne. Ad esempio è assolutamente necessario che le luci di emergenza, i fari e le luci dei freni mantengano la loro funzionalità in tutte le condizioni, soprattutto durante l'avviamento a freddo, quando la tensione della batteria raggiunge valori molto bassi (anche 4V). Ma in certe condizioni esperimentano tensioni anche superiori ai 30V.
Gli alimentatori DC-DC ben si adattano ad ampie e repentine variazioni della tensione di alimentazione, inoltre alla loro relativa semplicità uniscono un’alta efficienza, valori superiori al 90%.
Aumentando la frequenza di commutazione si riducono linearmente le dimensioni dei componenti reattivi, permettendo schede PCB più piccole e conseguentemente costi ridotti.
Le tecnologie BCD consentono di integrare su un singolo chip (SOC - System On Chip) transistor di potenza, logica di controllo e diagnostica.
In questa ricerca sono stati sviluppati tre convertitori Buck che lavorano a tre diverse frequenze 1MHz, 4MHz e 10MHz con una corrente di uscita di 3A. Tra i Buck converter disponibili sul mercato solo quelli più performanti hanno frequenze di commutazione di 2,0-2,5 MHz e correnti nel carico di 2-2,5 A.
Poiché l'obiettivo di 10MHz con una corrente di carico di 3A è molto aggressivo, è stata adottata un'architettura del convertitore Buck che minimizza il tempo di transizione dei segnali elettrici ed è stato necessario sviluppare una nuova topologia di driver molto più veloce e potente delle soluzioni adottate finora (patent pending).
Al momento in cui scriviamo, i dispositivi da 1 MHz e 4 MHz sono in fase di diffusione. L'uscita dei wafer è prevista per febbraio 2023. Il terzo convertitore Buck (10 MHz) e’ in attesa di diffusione.
Durante questo lavoro di dottorato sono state presentate quattro proposte di brevetto.This work was carried out in cooperation between Infineon and the University of Milan Bicocca, the aim being to develop the core of a DC-DC Buck Converter with a high switching frequency. Switching converters offer a simple and efficient way to power electronic loads. In addition, DC-DC power supplies make it possible to effectively meet many safety requirements of modern automobiles. For example, it is absolutely necessary that emergency lights, headlights and brake lights maintain their functionality under all conditions, especially during cold starting, when the battery voltage reaches very low values (even 4V). But under certain conditions they experience voltages even above 30V. DC-DC power supplies are well suited to large and sudden variations in supply voltage, and in addition to their relative simplicity they combine high efficiency, values of over 90%. Increasing the switching frequency reduces the size of reactive components linearly, allowing smaller PCBs and consequently lower costs. BCD technologies allow power transistors, control logic and diagnostics to be integrated on a single chip (SOC - System On Chip). In this research, three Buck converters were developed that operate at three different frequencies 1MHz, 4MHz and 10MHz with an output current of 3A. Of the buck converters available on the market, only the best performing ones have switching frequencies of 2.0-2.5MHz and load currents of 2-2.5A. Since the target of 10MHz with a load current of 3A is very aggressive, a Buck converter architecture was adopted that minimises the transition time of electrical signals, and a new driver topology had to be developed that is much faster and more powerful than the solutions adopted so far (patent pending). At the time of writing, 1 MHz and 4 MHz devices are being deployed. The wafers are scheduled for release in February 2023. The third Buck converter (10 MHz) is pending deployment. Four patent proposals were submitted during this doctoral work.
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Vieira, Nayara da Silva. "Entre o imoral e o subversivo : a Divisão de Censura de Diversões Públicas (DCDP) no regime militar (1968-1979)." reponame:Repositório Institucional da UnB, 2010. http://repositorio.unb.br/handle/10482/7002.
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Dissertação (mestrado)-Universidade de Brasília, Instituto de Ciências Humanas, Departamento de História, 2010.Submitted by Shayane Marques Zica (marquacizh@uol.com.br) on 2011-03-02T19:38:51Z No. of bitstreams: 1 2010_NayaradaSilvaVieira.pdf: 1853145 bytes, checksum: 5bfe02a3c9a91fe8f7451cec5d0dda04 (MD5)
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Este trabalho trata dos modos de operação da censura de diversões públicas no Brasil durante parte da Ditadura Militar, entre os anos 1968 e 1979, anos que correspondem a vigência da legislação de censura prévia. O cerne da análise vem a ser o estudo das formas de organização burocrática da censura, com foco na Divisão de Censura de Diversões Públicas (DCDP). A partir da leitura crítica de pareceres de censura e de estudos a respeito dos mecanismos e formas de atuação vivenciadas pelos censores servidores da instituição DCDP examinou-se, além das suas apresentações espaçotemporais, suas ferramentas essenciais de trabalho: a legislação e a inserção do ideário ditatorial em uma cultura institucional censora já organizada no Brasil. Esta análise se deveu ao caráter institucional da DCDP; por ser sido a Censura de Diversões Públicas um fenômeno social executado, em grande parte, por meio de formas simbólicas e também como procedimento estritamente marcado por influências ideológicas, sejam elas provenientes do poder ditatorial instalado ou de outros setores da sociedade. A operacionalização do não produziu documento primordial no escopo das fontes utilizadas na abordagem da censura sobre as manifestações culturais do país - o parecer de censura, o qual foi analisado considerando-se suas funções originais e seus aspecto histórico. O estudo chega a conclusão de que, mesmo frente a um forte poder ditatorial instalado, anteriores práticas censoras permanecem norteando o aparelho de censura durante a ditadura militar. _______________________________________________________________________________ ABSTRACT
This work is about the public entertainment censorship’s operations in Brazil during a part of the Military Dictatorship, between 1968 and 1979, years that match the duration of prior censorship legislation. The core of the analysis is the study of the organizational bureaucratic forms of censorship, focusing on Public Entertainment Censorship Division (DCDP). From the critical reading of the advice reports and studies concerning the mechanisms and the form of operation experienced by censors of DCDP was examined, in addition to its space-time presentations, their basic working tools: the legislation and the insertion of the dictatorial ideas in an institutional culture of censorship already organized in Brazil. This analysis about DCDP is due its institutional nature, as the Public Entertainment Censorship was a social phenomenon executed, largely, through symbolic forms as well as a procedure strictly marked by ideological influences, whether from dictatorial power installed or other sectors of society. The operalization of negative answers produced key documents in the scope of the sources used in the approach of censorship on cultural events across the country – censorship opinion, which was analyzed by considering its unique functions and their historical aspect. The study concludes that, even against a strong dictatorial power installed, censor past practices remained guiding the censorship apparatus of censorship during the military dictatorship. _______________________________________________________________________________ Rèsumé
Le propos de ce travail porte sur l’actuation de la Censure de Divertissement Publique au Brésil pendant la partie de la dictature Militaire correspondant au période de validité de la legislation de Censure Préalable entre les années 1968 et 1979. Le point central de l’analyse est l’étude des formes d’organization bureaucratiques de la censure focant sur la Division de Censure de Divertissements Publiques (DCDP). À partir de la lecture critique des ‘avis de censure’ et d’études concernants les mecanismes et formes d’actuation utilisées par les censeurs du DCDP, en plus de leurs presentations à l’espace/temps, on examine leurs outils essentiels de travail: la legislation et l’insertion de l’idéaire dictatorial dans une culture de censure institutionelle déjà établie au Brésil. Cette analyse s’est due à la nature institutionnelle du DCDP, étant la censure de divertissement publique un phénomène social produit, en grande partie, à travers des formes symboliques, ainsi qu'une procédure strictement marquée par des influences idéologiques, soyant par le pouvoir dictatorial installé ou par d’autres secteurs de la société. La façon d'opérer le non a produit le document primordial à la portée des sources utilisées dans le cadre de la censure à propos des manifestations culturelles au pays -le 'Avis de Censure' qui a été analysé en considerant ses fonctions originelles et ses aspects historiques. L'étude permet de concluire que, même contre un fort pouvoir dictatoriale établi, des pratiques de censure dejá existantes à ce moment-là, ont continuées a guider l’appareil de censure pendant la dictature militaire.
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Sucu, Mehmet. "Parametric average value modeling of flyback converters in ccm and dcm including parasitics and snubbers." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/38157.
Full textAbstract:
Modeling of switched-mode DC-DC converters has been receiving significant interest due to their widespread applications. Averaged modeling is the most common approach (and tool) that has been used to analyze dynamic performance of converter circuits. Specifically, state-space averaged models are widely used because of their simplicity and generality. However, as has been shown in the literature, the challenges of directly applying this approach to predict the discontinuous variables (states) and include the parasitics and losses have limited application of this approach to a wider range of converter circuits. The recently introduced parametric average value models (PAVM) has a potential to overcome this problem.
In this Thesis, first of all a second-order flyback converter has been investigated. An analytical solution of state-apace averaging and small-signal analysis of the flyback converter in continuous conduction mode (CCM) and discontinuous conduction mode (DCM) is given without and with parasitics. The PAVM methodology has been applied to the second-order model to overcome the problem of discontinuous state during the DCM.
The snubber circuits in flyback converter have also been investigated. Appearance of snubbers in the model introduces a problem on the output voltage besides improving the efficiency prediction. It is shown that with the snubbers the conventional state-space averaging cannot predict the output voltage correctly in CCM and DCM. To solve this problem the model is partitioned into two different sub-circuits: i) switching sub-circuit circuit; and ii) non-switching sub-circuit. Thereafter it becomes possible apply the averaging on the switching sub-circuit only.
Finally, a full-order flyback converter with two RC snubber circuits and all the basic parasitics is considered. The PAVM methodology has been extended to this class of switching converter for the first time. It is shown that including the snubbers and parasitics significantly improves the model accuracy in terms of predicting converter efficiency, which represents an appreciable improvement over all previously existing average models. The proposed model has been verified with detailed simulations and hardware measurements.
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Montoro, Ana Paula Pietro Nobre. "Validação concor-rente do MABC-2 Teste Motor com o DCDQ BR: estudo preliminar para a faixa etária de 7 a 10 anos." Universidade do Estado de Santa Catarina, 2015. http://tede.udesc.br/handle/handle/328.
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Previous issue date: 2015-06-26Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Introdução: O movimento é um componente fundamental do ser humano, que lhe permite satisfazer as necessidades básicas da vida. Por este motivo é tão importante avaliar e mensurar os impactos da competência motora na vida das crianças. Uma das ferramentas mais utilizadas para identifi-car crianças com dificuldades motoras é a Movement Assessment Battery for Children Segunda Edição (MABC-2), composta por testes motores e um questionário (MABC-2 Checklist), esse instrumento tem sido usado e testado em várias nacionalidades (Estados Unidos, Japão, China, Espanha, Grécia). Na atualidade os estudos apresentam controvérsias a respeito da eficácia dos instrumentos utilizados pa-ra avaliar o desenvolvimento motor. Objetivos: Esse estudo objetivou verificar a validade concorrente do Movement Assessment Battery for Children Segunda Edição (MABC-2) - Teste Motor para crianças de 7 a 10 anos (faixa etária 2 do MABC-2) com o Developmental Coordination Disorder Questionnaire Brasil (DCDQ-BR). Conseguinte, o primeiro artigo tem como finalidade investigar os testes motores validados para avaliar o desempenho motor de crianças por meio de uma revisão sistemática. No segundo artigo o objetivo foi verificar a validade concorrente da bateria motora do MABC-2 com o DCDQ-BR de acordo com o sexo e a faixa etária. Método: No primeiro artigo foi realizada uma busca nas bases de dados eletrônicas, Medline/PubMed (Medical Literature Analysis and Retrieval Systen),Web of Science e Scopus , seguindo o critério de inclusão adotados. Foram utilizados para a pesquisa os descritores na língua inglesa: (motor skills disorders), (validation studies or vali-dity), (child or children or only child). Com base nos critérios de busca e seleção, foram identificados 859 artigos. Destes, 624 foram excluídos com base na análise do título, 235 foram selecionados por resumos e para leitura na íntegra foram elegidos 108 estudos. Após a leitura dos artigos na íntegra, 29 trabalhos atenderam os critérios de inclusão que contemplam esta revisão. A qualidade dos artigos foi avaliada usando-se o Strengthening the Reporting of Obser-vational Studies in Epidemiology (STROBE). O segundo artigo que apresenta também o método geral do trabalho, constitui um estudo de validação caracterizado como pesquisa exploratória, com uma população selecionada de forma intencional. Foram avaliados 350 escolares sendo 175 meninas e 176 meninos do município da Grande Florianópolis SC e Manaus AM e seus pais ou responsáveis. Foram realizados os testes motores do instrumento MABC-2 (faixa etária 2), com crianças nas idades de 7 a 10 anos. O instrumento DCDQ-BR, foi respondido pelos pais ou responsáveis dos escolares. Após a coleta, para a caracterização dos dados foi utilizada a análise estatística descritiva realizada por meio de freqüências relativas e absoluta. E para verificar a normalidade dos dados o teste Kolmogorov-Smirnov. Porém, as variáveis não apresentaram com distribuição normal, desta forma, foram utilizados, para análise inferencial, apenas testes não paramétricos. A comparação entre as faixas etárias foi realizada por meio dos testes U de Mann-Witney e o coeficiente de Correlação de Spearman para a validação concorrente. Em todas as análises estatísti-cas foi adotado o nível de significância p≤0,05. Resultados: Referente ao artigo 1, os instrumentos de avaliação motora mais utilizados nos estudos foi a Movement Assesment Bat-tery for Children (MABC), Developmental Test of Visual Motor (VMI-5), Bruininks-Oseretsky Test of Motor Profici ency (BOTMP), Movement Assesment Battery for Children (MABC 2) e o Developmental Coordination Disorder Ques-tionnaire (DCDQ). Nos critérios de validação dos instrumentos os métodos mais utilizados foram: validação concorrente, seguido da validação de constructo e adaptação transcultural. No segundo artigo, a validade concorrente apresentou uma correlação positiva e significativa apresentando valores de (r= 0,40; r= 0,60) entre os instrumentos, independentes do sexo e da faixa etária. Para as classificações motoras foram agrupadas em Risco/Dificuldade de Movimento e Sem Dificuldade de Movimento. Quanto à desordem motora mediante a classificação do teste motor MABC-2, houve maior prevalência no sexo masculino na faixa etária 09-10. Diante dos resultados apontados, esta pesquisa fornece evidências para considerar o MABC-2 como um protocolo de avaliação motora para ser utilizado em crianças de duas regiões do país, legitimando-se como uma ferramenta de triagem para o diagnóstico do Transtorno do Desenvolvimento da Coordenação TDC.
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Nziakou, Yannick. "Analyse multi-échelle des mécanismes d'endommagement des matériaux composites à morphologie complexe destinés à l'aéronautique." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066553/document.
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L’étude porte sur la propagation lente de fissure à température ambiante dans deux classes de polymères à l’état vitreux : le PMMA et la résine époxy-amine stœchiométrique DGEBA-IPD comme prototypes respectifs de thermoplastique (TP) et de thermodurcissable (TD). Des mélanges TD/TP présentant une séparation de phase de nano-domaines de thermoplastique dans une phase dominante de thermodurcissable ont été aussi explorés en vue de leur intérêt en tant que matrice à morphologie complexe utilisée dans les composites à renfort de fibre de carbone destinés à l’aéronautique. Un montage expérimental original a été développé pour le suivi in situ de propagation lente de fissures, combinant une caméra optique, un microscope à force atomique (AFM) et un échantillon sollicité en géométrie Double Cleavage Drilled Compression (DCDC). La possibilité d’accéder ainsi à une gamme de vitesses de propagation entre le pm/s et le nm/s a permis de mettre en évidence pour la toute première fois un régime de propagation stationnaire dans les thermodurcissables (résines pures et mélanges TD/TP) analogue au comportement établi pour les thermoplastiques, et de le caractériser en termes d’une loi cinétique reliant la vitesse de propagation au facteur d’intensité des contraintes (SIF). L’analyse in situ AFM a de plus permis de caractériser les différentes modalités de déformation à l’échelle de la zone de process en combinant l’imagerie topographique et des techniques de corrélation d’images numériques (DIC). Un modèle de prédiction des énergies de rupture en propagation stationnaire ainsi qu’en régime de stick-slip a été développé, en intégrant les champs de déformation visco-plastiques mesurés dans la zone de process, la vitesse de déformation locale, et la loi de comportement des matériaux mesurée à l’échelle macroscopiqueThis work deals with the slow crack growth in glass polymer materials at room temperature, namely PMMA and stoechiometric epoxy-amine DGEBA-IPD resin as archetypes of thermoplastic (TP) and thermoset (TS) respectively. TS/TP blends developing phases separation in nano-domains of thermoplastic during the cure process have also been studied since they are used as matrix with a complex morphology in carbon fibers reinforced composites materials for aircrafts. An innovative experimental setup has been developed for in situ investigation of slow crack growth by combining optical measurements, in situ atomic force microscopy (AFM) and a Double Cleavage Drilled Compression (DCDC) sample. By this way, a steady state crack propagation regime has been highlighted for a first time in thermosets (pure and TS/TP blends) with crack speed ranging from pm/s to nm/s. Thus crack speed and stress intensity factor (SIF) diagrams were established for each material. Furthermore, in situ AFM images allowed characterizing deformations at the process zone scale by combining topographic imaging with Digital Images Correlation (DIC) technique. Finally, we developed a model for predicting fracture energy for steady state propagation and stick-slip regime, based on the visco-plastic strain fields measured round the process zone, the local strain rate, and the constitutive laws of materials measured at the macroscopic scale
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Stüker, Fernanda. "Dicianodiamida (DCD) como inibidor da nitrificação do nitrogênio amoniacal de dejetos líquidos de suínos no solo." Universidade Federal de Santa Maria, 2010. http://repositorio.ufsm.br/handle/1/5524.
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Inhibition of nitrification of ammonia nitrogen (N) from pig slurry in soil after application can mitigate N losses by denitrification and leaching of nitrate (NO3-), with
economic and environmental benefits. However, this strategy has not yet been evaluated by Brazilian research, which motivated the present work. The objective
was to evaluate the efficiency of the product AGROTAIN Plus, which contains 81% of the inhibitor dicyandiamide (DCD), in slowing the nitrification of ammonium N applied
to soil with pig slurry. For this, two incubations were performed under controlled humidity (80% cc) and temperature (25ºC), where nitrification was assessed by the
accumulation of NO3 - in soil. In the first incubation conducted for 72 days, doses of 3.5, 7.0 and 14 kg ha-1 of AGROTAIN Plus were compared, applied to the soil at the
time of the manure addition (29.4 m3 ha-1). The dicyandiamide (DCD) inhibited the nitrification of N ammonia from manure, and the size and duration of this inhibition was dependent on the dose of AGROTAIN Plus applied. At a dose of 14 kg ha-1 (11.3 kg DCD ha-1) nitrification was completely inhibited in the first 12 days. During the first month after the manure application, where nitrification was more intense, increasing
the dose of AGROTAIN Plus in 1 kg ha-1 (0.81 kg DCD ha-1) reduced the N-NO3 - accumulation in 3,8 kg ha-1. In the second incubation, evaluated for 60 days, was studied the effect of these same three doses of AGROTAIN Plus on soil microbial activity. Besides that, was evaluated the effect of the 7.0 kg ha-1 dose of product in inhibiting nitrification of N ammonia from pig slurry (34 m3 ha-1) and the mineralization of pig slurry C and N. The effect of the nitrification inhibitor was similar to that
observed in the first incubation, while the manure N mineralization and soil microbial activity were not affected by the AGROTAIN Plus addition. The findings suggest that dicianodiamida (DCD), by delaying the onset of N-NO3 - in soil after application of pig slurry, reduces the N losses and the polluting potential of slurry.A inibição da nitrificação do nitrogênio (N) amoniacal dos dejetos de suínos, após sua aplicação no solo, poderá mitigar as perdas de N por desnitrificação e lixiviação de nitrato (NO3 -), com benefícios econômicos e ambientais. Todavia, essa estratégia ainda não foi avaliada pela pesquisa brasileira, o que motivou a realização do presente trabalho. O objetivo foi o de avaliar a eficiência do produto Agrotain Plus, que contém 81% do inibidor dicianodiamida (DCD), em retardar a nitrificação do N amoniacal aplicado ao solo com dejetos líquidos de suínos. Para isso, foram realizadas duas incubações sob condições controladas de umidade (80% cc) e de temperatura (25ºC), onde a nitrificação foi avaliada através do acúmulo de NO3 - no solo. Na primeira incubação, conduzida durante 72 dias, foram comparadas as doses de 3,5, 7,0 e 14 kg de Agrotain Plus ha-1, aplicadas ao solo no momento da adição dos dejetos (29,4 m3 ha-1). A dicianodiamida (DCD) inibiu a nitrificação do N amoniacal dos dejetos, sendo que a magnitude e a duração da inibição foram dependentes da dose de Agrotain Plus aplicada. Na dose de 14 kg ha-1 (11,3 kg de DCD ha-1) a nitrificação foi completamente inibida nos primeiros 12 dias. Durante o primeiro mês após a aplicação dos dejetos, onde a nitrificação foi mais intensa, o aumento na dose de Agrotain Plus em 1 kg ha-1 (0,81 kg de DCD ha-1) reduziu o acúmulo de N-NO3 - em 3,8 kg ha-1. Na segunda incubação foi avaliado, durante 60 dias, o efeito dessas mesmas três doses de Agrotain Plus sobre a atividade microbiana do solo. Além disso, avaliou-se o efeito da dose de 7,0 kg ha-1 do produto na inibição da nitrificação do N amoniacal dos dejetos (34 m3 ha-1) e na mineralização do C e do N dos mesmos. O efeito do inibidor de nitrificação foi semelhante ao observado na primeira incubação, enquanto a mineralização do N dos dejetos e a atividade microbiana do solo não foram afetadas pela adição do produto Agrotain Plus. Os resultados desse trabalho sugerem que a diacianodiamida (DCD), ao retardar o aparecimento de N-NO3 - no solo após a aplicação dos dejetos de suínos, reduz as perdas de N e o potencial poluidor dos dejetos.
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Paulmann, Maren [Verfasser], and Birgit [Akademischer Betreuer] Schittek. "Strukturelle Untersuchungen zum Wirkmechanismus von DCD-1L, einem anionischen antimikrobiellen Peptid / Maren Paulmann ; Betreuer: Birgit Schittek." Tübingen : Universitätsbibliothek Tübingen, 2014. http://d-nb.info/1196877645/34.
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Ramos, Marines. "Parâmetros cinemáticos e temporais da habilidade de alcançar para pegar crianças com desordem coordenativa desenvolvimental (DCD)." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2002. http://hdl.handle.net/10183/9972.
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Diferentes tipos de análise da habilidade de alcançar para pegar têm sido conduzidas no intuito de melhor compreender as características motoras observáveis e os mecanismos internos subjacentes à coordenação e controle desse movimento. Neste sentido, o presente estudo objetivou analisar a organização cinemática e temporal da habilidade de alcançar para pegar uma bola em crianças com DCD em duas velocidades distintas (V1= (1,14 ± 0,03) m/s e a V2 = (1,57 ± 0,04) m/s). A amostra foi constituída por 20 crianças de ambos os sexos (10 sem DCD e 10 com DCD). A faixa etária em média do grupo sem DCD foi de 109,6 meses e para o grupo com DCD 122,5 meses. A análise do movimento foi realizada a partir da identificação do tempo para o início do movimento, e dos parâmetros cinemáticos e temporais relacionados aos componentes de transporte e manipulativo. Cada criança realizou três tentativas, em cada velocidade, as quais foram registradas a partir de um sistema de vídeo 3D Peak-Performance e um cronômetro digital. Os resultados indicaram que o grupo de crianças com DCD apresentou um Tempo de Início de Movimento (TIM) mais longo que o grupo sem DCD em ambas as velocidades. A análise entre os grupos revelou diferenças somente no componente de transporte na V1, na qual o grupo com DCD apresentou um Tempo para alcançar o Pico de Velocidade (TPV) mais longo que o grupo sem DCD. Tais evidências sugerem que os déficits identificados nas crianças com DCD podem estar relacionados a uma necessidade de mais tempo para programação da resposta, bem como a execução de movimentos mais lentos na fase inicial do transporte da mão para pegar a bola. A busca da compreensão dos mecanismos responsáveis por tal desordem, nos oferece subsídios para um futuro trabalho de intervenção com crianças que apresentam a DCD.Different analyses of the reach to grasp movement have been conducted aiming the understanding of the comprehend the observed motor characteristics and the mechanisms underlying of the movement coordination and control. The aim of this study was to analyze the cinematic and temporal organization of the reach to grasp a moving ball, in children with DCD, in two different velocities (V1= (1,14 ± 0,03) m/s and V2 = (1,57 ± 0,04) m/s). The movement analysis was conducted with the identification of the time of movement initiation and the cinematic and temporal parameters related to the transport and manipulative components. Each child performed three trials, in each velocity, recorded by a 3D video system Peak Performance and one digital chronometer. The results showed that the DCD children were slower in the movement initiation time than the children without DCD, in both velocities. The inter-groups analysis reveled differences only in the transport component, in the V1, where the DCD group presented the time to reaching peak velocity longer than the group without DCD. These evidences suggest that the deficits identified in children with DCD may be related with a necessity of the longer time to program the response, as well the slower movement execution in the early phase of the hand transportation to grasp a ball. The understanding of the responsible mechanisms for such disorder, offer us background for a future work of the intervention with DCD children.
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"Interworking Methodologies for DCOM and CORBA." East Tennessee State University, 2003. http://etd-submit.etsu.edu/etd/theses/available/etd-1104103-205221/.
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Chi, Hsin-Wei, and 紀信維. "Implementation of High Efficiency DCDC Converter." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/17075473241544416654.
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碩士元智大學
電機工程學系
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ABSTRACT The aim of this research is to develop a high efficiency DCDC converter. In the process of designing a DCDC converter,the output efficiency will be enhanced if a suitable circuit structure can be chosen first. In this thesis,the basic operation principle of Half Bridge Centro Tap and Current Double structure is discussed. Next, the consideration of component and circuit design is explained. Finally, a practical Half Bridge Current Double Converter based on the theory of DCDC converter is implemented to prove its accessibility. The study is conducted with four different structures.