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Raphael, Brandon Adam. "A Map of DCO⁺ 3-2 and Deuteration Ratio in NGC 1333." Thesis, The University of Arizona, 2015. http://hdl.handle.net/10150/578974.
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Deuterium fractionation may prove to be a valuable tracer of the gas associated with the earliest phases of star formation. Specifically, HCO⁺ is an abundant molecule in cold, dense gas clouds in the ISM. The HCO⁺ molecule is deuterated and becomes DCO⁺. NGC 1333, which lies in the Perseus Molecular Cloud, is a well-documented, active protostellar-forming region which may serve as a good platform to test the usefulness of DCO⁺ as a gas tracer. H¹³CO⁺ is known to be sensitive at similar conditions as DCO⁺, thus the ratio of DCO⁺ to H¹³CO⁺, R(D), then provides a method of mapping the Deuterium fractionation. We mapped the NGC 1333 region in the spectral line DCO⁺ 3 - 2 and compare to a previous map of H¹³CO⁺ 3 - 2 to derive R(D). We find a maximum R(D) = 0.140, with typical values of a few times 0.01 that is comparable to other studies. DCO⁺ emission is extended in this region and correlates well with dust continuum emission, but the Deuterium fractionation was not strongly dependent on peak core location. These results indicate that astrochemical surveys that use pointed observations at core peak locations may miss significant structure in the Deuterium fractionation within molecular clouds.
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Kulmonová, Petra. "Ocenění společnosti RACIO, s.r.o." Master's thesis, Vysoká škola ekonomická v Praze, 2013. http://www.nusl.cz/ntk/nusl-194214.
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The aim of this diploma thesis is to estimate the market value of the company Racio Ltd. as of the date 07/01/2014. Market value represents the amount of money, which is an average market customer willing to pay. The thesis is divided into two parts. The first, theoretical part deals with the definition of related basic terms, describes the process of business valuation including used formulas and methods. The second part is practical; business valuation theoretical framework is applied to specific company -- Racio, s.r.o. Starting point of business valuation process is strategic analysis; the outcome is prediction of company sales forecast. The following financial analysis evaluates the financial health of the company. On those two analyses, generators values (which enable drawing up of financial plan) are designed. The final section focuses directly on valuation of the company Racio Ltd. using DCF APV method.
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Matumaini, Joseph. "The role of radio in the process of development in Tanzania : a comparative study of Radio Tanzania dar es salaam, Radio Tumaini and Clouds FM /." Roma : Pontifical Gregorian university, 2006. http://catalogue.bnf.fr/ark:/12148/cb41166112r.
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Häger, Emelie, and Penelope Magounakis. "Setting the News Agenda : Women’s Influence and Status in Dar es Salaam’s Radio Newsrooms." Thesis, Linnéuniversitetet, Institutionen för medier och journalistik (MJ), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-60010.
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The widespread presence of radio in Tanzania suggests that the news being broadcasted nationally has a large public and political impact. In this thesis we examine what roles a few women journalists hold in Dar es Salaam’s radio newsrooms. Our research question concerns how these women journalists perceive their influence in the newsroom during the agenda setting process. We interviewed seven women journalists, who hold varying positions in different radio newsrooms in Dar es Salaam, concerning their perception of their own informal status in the office hierarchy. We then present and analyze key quotes from our respondents using Bourdieu’s theory of social fields and perspective on male domination, Hirdman’s stereotypical gender contract and a postcolonial feminist perspective. Our repondents told us of the importance of empowering other women at the editorial office as well as putting gender issues revolving women and girls on the news agenda. In this way they demonstrate the importance of a gender equal representation in the newsroom and in the news content. We come to the conclusion that our respondents do indeed perceive themselves to have influence over the news agenda and they use different strategies to gain status and recognition in the newsroom.
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Wachanga, David Ndirangu O'Connor Brian C. "Sanctioned and controlled message propagation in a restrictive information environment the small world of clandestine radio broadcasting /." [Denton, Tex.] : University of North Texas, 2007. http://digital.library.unt.edu/permalink/meta-dc-5113.
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Reffue, John D. "A rhetoric of sports talk radio." [Tampa, Fla] : University of South Florida, 2005. http://purl.fcla.edu/usf/dc/et/SFE0001462.
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Celebi, Hasari. "Location awareness in cognitive radio networks." [Tampa, Fla] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002562.
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Greaves, Stephanie A. Glenn Sigrid S. "Effects of fixed- and variable-ratio token exchange schedules on performance with a child with autism." [Denton, Tex.] : University of North Texas, 2008. http://digital.library.unt.edu/permalink/meta-dc-9778.
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Kincaid, Cheryl-Annette Mikler Armin. "Analyzing microwave spectra collected by the solar radio burst locator." [Denton, Tex.] : University of North Texas, 2007. http://digital.library.unt.edu/permalink/meta-dc-3655.
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Yücek, Tevfik. "Channel, spectrum, and waveform awareness in OFDM-based cognitive radio systems." [Tampa, Fla.] : University of South Florida, 2007. http://purl.fcla.edu/usf/dc/et/SFE0002160.
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Engström, Daniel, and Niklas Gustafsson. "Swedish Equity Sectors Risk Management with Commodities : Revisiting dynamic conditional correlations and hedge ratios." Thesis, Linköpings universitet, Nationalekonomi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-139040.
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The purpose of this study is to investigate changes in dynamic conditional correlations between Swedish equity sector indices and commodities using oil, gold, copper and a general commodity index. Additionally the purpose is to evaluate which of the two methods, DCC- GARCH or GO-GARCH that is more efficient in estimating correlation for hedge ratio calculation. Daily data on the FTSE30 index of Sweden and its sector indices have been studied between the years 1994 and 2017. A DCC-GARCH (1,1) and GO-GARCH (1,1) model with one autoregressive term AR(1) using multivariate Student t- and Multivariate Affine Negative Inverse Gaussian distribution were used to estimate conditional correlations. Correlations between Swedish FTSE30, its sector indices and commodities are considerably lower than previous research has found American or emerging markets correlation with commodities to be. This suggests better diversification opportunities with commodities for the Swedish market. Optimal hedge ratios (OHR) was calculated and back tested using a rolling window analysis with 1000 days forecast length and 20 days re-estimation window and evaluated using a calculated hedge effectiveness index (HE). Determined by HE, copper is the best hedge for the Swedish composite FTSE30 and sector indices using conditional correlation from the GO-GARCH during the data period. Gold is considered as a semi-strong safe haven due to its negative correlation with all sectors. Additionally, this study identifies a temporarily large increase in the correlation between the Swedish equities sectors and composite index with commodities around the years 2015/2016. This study also emphasizes the difference between stressful and calm periods in the market.
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Aruchamy, Logabharathi. "Analysis of Radio Access Network Buffer Filling Based on Real Network Data." Thesis, Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-6063.
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The 3G and 4G networks have drastically improved availability and quality in data transmission for bandwidth hungry services such as video streaming and location-based services. As 3G networks are very widely deployed, there exists increased capacity requirement and transport channel allocation to simultaneous users under a particular cell. Due to this reason, adequate resources are not available, which in turn degrades both service quality and user experienced quality. This research aims at understanding the characteristics of buffer filling during dedicated channel (DCH) transmission under fixed bit-rate assumptions on a per-user level taking different services into consideration. Furthermore, the resource utilisation in terms of empty buffer durations and user throughput achieved during dedicated channel transmission are also analysed for different data services existing in the mobile networks. The traces are collected from a real network and characteristics of the traffic are analysed prior to understanding its buffer filling in Radio Network Controller (RNC) during downlink data transmission. Furthermore, the buffer is modelled with some series of assumptions on channel bit-rates and simulations are performed taking single user scenario into consideration, for different services with the help of obtained traces as input to the buffer. This research is helpful in understanding the RNC buffer filling for different services, in turn yielding possible understanding on the existing transport channel switching scenario. With the help of analysing the buffer filling for different services and transport channel utilisation, we learn that most of the data services show low DCH utilisation of approximately around 20% and also found to have 80% of the total DCH session duration with empty buffer, causing sub-optimal radio resource utilization.
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Gibson, Cuthbert R. "Maximizing the benefits of ITS deployments based on IDAS performance measures and B/C ratios." [Tampa, Fla] : University of South Florida, 2005. http://purl.fcla.edu/usf/dc/et/SFE0001396.
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Murasko, Susan Mary. "Particulate carbon, nitrogen and phosphorus stoichiometry of south west Florida waters." [Tampa, Fla] : University of South Florida, 2009. http://purl.fcla.edu/usf/dc/et/SFE0003036.
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Güvenç, İsmail. "Towards practical design of impulse radio ultrawideband systems : parameter estimation and adaptation, interference mitigation, and performance analysis." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001525.
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Clayback, Kim Beth. "Investigation of normalized streamflow in West Central Florida and extrapolation to ungaged coastal fringe tributaries." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001689.
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Pratt, Kevin S. "Analysis of VTOL MAV use during rescue and recovery operations following Hurricane Katrina." [Tampa, Fla.] : University of South Florida, 2007. http://purl.fcla.edu/usf/dc/et/SFE0002209.
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Chandaver, Nahush. "Organizational Form of Disease Management Programs: A Transaction Cost Analysis." [Tampa, Fla.] : University of South Florida, 2007. http://purl.fcla.edu/usf/dc/et/SFE0002314.
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Santos, Monica Alessandra Teixeira dos. "Efeito da pectina e da celulose na toxicidade de inseticidas piretroides sobre parametros eletrocardiograficos e morfologicos em ratos Wistar machos recem desmamados." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/255126.
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Orientador: Miguel Arcanjo Areas<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia de Alimentos<br>Made available in DSpace on 2018-08-09T20:50:29Z (GMT). No. of bitstreams: 1
Santos_MonicaAlessandraTeixeirados_D.pdf: 1218402 bytes, checksum: c91dd447b33272e2f271723339af18ec (MD5)
Previous issue date: 2008<br>Resumo: Ratos Wistar recém desmamados foram expostos, por via oral, a deltametrina e permetrina para avaliação dos efeitos cardiotóxicos assim como o provável efeito protetor de fibras alimentares sobre a ação desses piretróides. O trabalho teve como objetivos específicos à avaliação eletrocardiográfica, o estudo histológico do fígado e coração e a determinação de resíduos no coração e fígado dos animais experimentais. Para tanto, o trabalho foi dividido em três partes: 1) Ensaio agudo, 2) Ensaio subcrônico, 3) Ensaio subcrônico + administração de fibras. Na primeira fase do experimento, os animais receberam doses equivalentes à 1/2 DL50, 1/5 DL50 e 1/10 DL50 de permetrina e deltametrina em dose única, com o objetivo de se determinar a menor dose onde se observa efeito agudo (LOAEL). Durante o ensaio biológico, os inseticidas foram administrados por gavagem com a utilização de óleo de milho (5 mL/kg) como veículo. Os animais do grupo controle receberam apenas óleo de milho, nas mesmas condições. Após a realização dos eletrocardiogramas (ECG) constatou-se que administração de 1/10 DL50 de permetrina e deltametrina foi a melhor dose para a realização do ensaio subcrônico de 28 dias. Durante o ensaio subcrônico, os piretróides foram administrados, diariamente, nas mesmas condições do ensaio agudo tendo sido verificado no ECG dos animais experimentais efeito cronotrópico negativo, prolongamento do intervalo PR e do complexo QRS, sugerindo retardo na condução dos estímulos dos átrios para os ventrículos. Além disso, o prolongamento dos intervalos QT e QTc indicaram retardo no processo de despolarização e repolarização ventricular, sugerindo risco de morte súbita. O complexo QRS apresentou maior prolongamento somente nos animais que receberam a deltametrina. Na terceira fase do experimento, foi avaliado o possível efeito protetor da pectina (fibra solúvel) e da celulose (fibra insolúvel), sobre a ação cardiotóxica dos piretróides, com a utilização da dose testada no ensaio subcrônico. A pectina se mostrou eficiente na redução dos efeitos tóxicos observados, já que sua presença aumentou a freqüência cardíaca e reduziu o intervalo PR, QT e QTc além do complexo QRS. A ingestão de celulose não alterou o quadro de toxicidade observado nos animais submetidos às substâncias testadas. Após o término dos ensaios subcrônicos, o coração e o fígado foram retirados dos animais experimentais para a avaliação histológica. O coração dos animais não apresentou alterações histológicas após a exposição a ambos os piretróides, no entanto, os fígados dos ratos que ingeriram deltametrina apresentaram células inflamatórias, hapatócitos irregulares, alterações citoplasmáticas, núcleo condensado e nucléolo indefinido. A exposição oral a permetrina induziu as mesmas alterações histológicas observadas nos fígados expostos a deltametrina, com exceção de infiltrações inflamatórias. A administração de pectina na dieta reduziu todas as alterações histológicas observadas anteriormente. No entanto, a celulose não se mostrou eficaz na proteção dos tecidos contra os efeitos histológicos dos piretróides estudados. Ao final do ensaio de toxicidade subcrônica, os resíduos de deltametrina e permetrina foram determinados no fígado e coração através do desenvolvimento/validação de método por cromatografia gasosa acoplada ao detector de captura de elétrons, não tendo sido detectada a presença destes resíduos nos tecidos estudados (LD < 0.9/0.2 para deltametrina e LD < 1/0.2 para permetrina em fígado e coração, respectivamente)<br>Abstract: The study was conducted on male wealing Wistar rats. They were exposed, by gavage, to deltamethrin and permethrin and the carditoxic effects of the pyrethroids and protective effects of dietary fibres were determinated. The purposes of this study were the eletrocardiographics evaluation, the histopathological study of the liver and heart and the residues determination in heart and liver of the rats. For that, this worky was divided in three parts: 1) Acute exposure, 2) Subchronic exposure, 3) Subchronic exposure + dietary fibres. In the first step, the animals were exposed to LD50, ½ LD50, 1/5 LD50 and 1/10 LD50 of permethrin and deltamethrin to determinate the lowest (LOAEL) dose which the acute effect could be observed. The insecticides were administrated in corn oil (5 ml/kg), intragastrically, in a single dose. Parallel studies were conduced in a control group that received only corn oil. The ECG records showed that 1/10 LD50 dose of permethrin and deltamethrin was the best dose for the conduction of subchronic assay. The experimental groups received the pyrethroids once a day for 28 days, in the same conditions of the first study. The subchronic poisoning resulted in negative chronotropism, prolongation of the PR interval and QRS complex, suggesting decrease of the stimulus from the atriums to ventricles. Besides, the prolongation of QT and QTc intervals indicated a decrease of the despolarization and repolarization processes suggesting sudden cardiac death. The QRS complex prolongation appeared only in the animals that received deltamethrin. In the third fase, the possible protective effects of pectin (soluble fiber) and cellulose (insoluble fiber) on pyrethroids cariotoxicity were evaluated. For this study, 1/10 LD50 dose was utilizated. Pectin increased the heart rate and decreased the PR, QT and QTc intervals and QRS complex, showing be efficient in reducing the cardiotoxicity. The ingestion of cellulose did not change the effects in heart observed in experimental animals. After the subchronic exposition, the heart and liver were taken in order to evaluate histologic changes. No changes were observed in the hearts of the rats exposed to both of pyrethroids. However, the liver of the animals exposed to deltamethrin showed inflamatory cells, irregular hepatocytes, cytoplasmatic changes, condensed nucleus and indefinite nucleolus. The permethrin induced the same histological changes observed in the livers exposed to the deltamethrin, exception of the inflamatory infiltrations. The pectin in the diet reduced all the histological changes previously observed and the cellulose did not efficient in the protection of the studied tissues. In the end of the subchronic essay, the tissue residues levels of permethrin and deltamethrin in heart and liver were estimated by gas chromatography with electron-capture detection. Residues of permethrin and deltamethrin were not observed in the studied tissues. (LOD < 0.9/0.2 for deltamethrin and LOD < 1.0/0.2 for permethrin in liver and heart, respectively)<br>Doutorado<br>Doutor em Ciência de Alimentos
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Barbaro, Agnès Roux-Fouillet Jean-Paul Barthet Emilie Hauchecorne Christine Miachon Coralie Thomas Aurélie. "RFId (Radio Frequency Identification) et circuit d'entrée des monographies arrivant par dépôt légal à la Bibliothèque nationale de France." [S.l.] : [s.n.], 2006. http://www.enssib.fr/bibliotheque/documents/dcb/M-2006-PRO-11.pdf.
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Johnston, Jennifer Lynn Atkinson Samuel F. "Home range analysis of rehabilitated and released great horned owls (Bubo virginianus) in Denton County, Texas, through radio telemetry." [Denton, Tex.] : University of North Texas, 2007. http://digital.library.unt.edu/permalink/meta-dc-5159.
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Sabigan, Charmy G. "Credibility perceptions of television and online news." [Tampa, Fla.] : University of South Florida, 2007. http://purl.fcla.edu/usf/dc/et/SFE0002300.
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Ganesan, Rajesh. "Process monitoring and feedback control using multiresolution analysis and machine learning." [Tampa, Fla] : University of South Florida, 2005. http://purl.fcla.edu/usf/dc/et/SFE0001248.
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Lahdhiri, Ameni. "Compréhension des processus biologiques dans les bioréacteurs à membrane : choix d'un outil simplifié de simulation et identification des critères déterminant le contrôle des processus." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS109.
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Les bioréacteurs à membranes (BRM), combinant l’épuration biologique des eaux usées à une étape de séparation membranaire, ont montré de très bonnes performances en matière d’élimination de la pollution organique et azotée. Cependant, cette technologie présente des surcoûts de fonctionnement liés essentiellement à l’énergie dépensée pour fournir l’aération nécessaire à l’activité biologique mais utilisée aussi pour lutter contre les phénomènes de colmatage membranaire. Afin de réduire ces besoins énergétiques, un BRM dit autotrophe a été mis en place. Il est caractérisé par une alimentation à une charge organique faible, dont plus de 60% est éliminé par un traitement physico-chimique préalable. De ce fait, le BRM autotrophe assure principalement le traitement d’azote, qui peut être affecté par la limitation en carbone organique nécessaire à la réaction de dénitrification. Ce travail a pour objectif d’étudier le comportement d’un tel système et d’identifier les paramètres déterminants. L’étude a été conduite expérimentalement et par modélisation. Deux campagnes expérimentales ont été réalisées en régime permanent à des charges organiques et des âges de boues différents, suivies d’une expérimentation en régime transitoire provoqué par une montée de la charge en azote ammoniacal. Les résultats des campagnes ont montré qu’il est possible de baisser le rapport de DCO/N jusqu’à 4,5 et l’âge des boues à 40j sans pour autant perturber la dénitrification. Ces résultats ont été appuyés par une modélisation dynamique s’appuyant sur un modèle ASM3s-SMP qui a été développé ensuite calibré sur l’ensemble des résultats expérimentaux. L’analyse du phénomène du colmatage de la membrane au cours de l’expérimentation a montré une tendance au colmatage relativement faible par rapport aux BRM opérant dans des conditions usuelles (DCO/N>10). L’effet du nettoyage mécanique induit par l’ajout d’un matériau granulaire dans le module membranaire s’est avéré peu important dans les conditions étudiées. Une modélisation en régime permanent a permis de développer les expressions des grandeurs caractéristiques du fonctionnement du BRM. Après avoir été validées par des simulations conduites en utilisant le logiciel GPS-X®Hydromantis, ces équations ont permis, au moyen d’approches de modélisation différentes (modèle simple, ASM1 et ASM3), de repérer les paramètres opératoires et cinétiques les plus influents et de déterminer par des expressions analytiques le rapport DCO/N minimal requis pour une réaction de dénitrification complète<br>Membrane Bioreactors (MBR) as a combination of biological wastewater treatment and a membrane separation step, showed high performances for organic and nitrogen compounds removal. However, this technology has high running costs linked to energy consumption for aeration. The latter has to be provided for the biological activity and for the membrane scouring that reduces membrane fouling phenomena. In order to decrease these expenses, an MBR called autotrophic was set. It is marked by low organic loading rates due to a physicochemical treatment removing more than 60% of the initial organic matter amount. Mainly, the autotrophic MBR is dedicated to nitrogen removal that can be influenced by the shortage of the organic substrate, needed to achieve the denitrification process. The aim of this work is the investigation of the behavior of such system and the identification of most determining parameters. Experimental and modeling studies were carried out. Two steady state experimental campaigns were performed at different organic loading rates and solid retention times. They were followed by an experiment at transient state induced by the nitrogen loading rate rise. Obtained results proved that operation at a COD/N ratio as low as 4.5 did not hamper the denitrification efficiency. Those results were reinforced by a dynamic modeling study based on a model called ASM3s-SMP that was developed and calibrated using the experimental results. Membrane fouling analysis during experimental campaigns showed low fouling propensities compared to MBR operating at more common conditions (COD/N>10). The mechanical cleaning effect due to the addition of a granular material to the membrane module was found insignificant in the case of these operating conditions.A steady state modeling study helped determining mathematical expressions of different variables, yields and rates describing the system operation. After a validation step based on simulations with the use of the GPS-X®Hydromantis software, these expressions associated to different modeling approaches (simple model, ASM1 and ASM3) allowed pointing out the critical operating and kinetic criteria in addition to the minimum COD/N ratio required for a complete denitrification reaction
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DI, GIACOMO STEFANIA. "Essays on financial markets and on effects of information and communication technology." Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2005. http://hdl.handle.net/2108/39.
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La tesi di dottorato si compone di quattro saggi empirici.
Il primo saggio verifica la performance delle strategie di portafoglio "value" e "growth" formate sulle deviazioni fra il valore osservato di un titolo e il valore fondamentale (determinato con il metodo di attualizzazione dei flussi di cassa), utilizzando il modello CAPM a 4-fattori. I risultati mostrano che, sia nel mercato azionario europeo che in quello americano, le strategie "short term DCF value" (basate su una selezione mensile dei titoli che hanno il più basso rapporto tra valore osservato e valore fondamentale nel periodo precedente) hanno rendimenti medi mensili che sono superiori a, non soltanto le strategie "growth" alternative, ma anche a quelle passive di "buy&hold" sul portafoglio campionario totale (il benchmark).
Il secondo saggio è dedicato allo studio di quanto i componenti "fondamentali" e "non fondamentali" sono importanti nella determinazione dei prezzi dei titoli azionari, in base alle differenze regolamentari tra paesi e alla composizione degli investitori nel mercato finanziario. I risultati empirici mostrano che il P/E fondamentale spiega una parte significativa della variazione del P/E osservato, soprattutto nel mercato americano (dove c’è più trasparenza di informazioni e una più dominante presenza dei fondi pensione). Mentre soltanto per il campione europeo c’è presenza di insider trading.
Il terzo saggio analizza il contributo dell’Information&Communication Technology ai livelli e alla crescita del GDP pro-capite. Le due ipotesi, che l’ICT aggiunge valore al capitale fisico tradizionale o rimuove i "colli di bottiglia" che limitano l’accesso alla conoscenza, risultano migliori del modello di MRW (1992) e di quello di Islam (1995). Il miglioramento della "within country" significatività nelle stime panel conferma che l’approccio seguito riesce a catturare due dimensioni del "time varying-country specific" progresso tecnologico.
Il quarto saggio è dedicato allo studio, tramite un modello a coefficienti random, del ruolo della tecnologia come fattore che, influenzando il potere e la produttività delle donne, ha effetti significativi sulle decisioni di fertilità. I risultati indicano che la diffusione di ICT ha un effetto negativo e significativo sui tassi di fertilità, anche dopo il controllo per il capitale umano e la qualità delle istituzioni di un paese. Inoltre questo effetto è altamente eterogeneo tra macroaree (vengono infatti identificati cinque diversi sottogruppi di paesi) per via di tre fattori latenti: le norme religiose pro-fertilità delle culture cattoliche ed islamiche, il grado di modernizzazione e di educazione di un paese e il "digital divide".<br>The present dissertation is divided into four empirical essays.
The first essay tests the performance of "value" and "growth" portfolio strategies formed on deviations between observed and discounted cash flow fundamental (DCF) values, using the four-factor CAPM model.The results show that, both in the American and European stock exchanges, "short term DCF value" strategies (based on a monthly selection of the stocks with the lowest observed to fundamental ratio in the previous period) have mean monthly returns which are higher than, not only the corresponding growth strategies, but also passive buy and hold strategies on the total sample portfolio (the benchmark).
The second essay is dedicated to the study of how much "fundamental" and "non- fundamental" components matter in determining stock prices according to differences in regulatory environments between countries and in the composition of financial market investors. Empirical show that the "fundamental" P/E explains a significant share of variation of the observed P/E, expectially for US stocks (where there is more transparency of information and more pervasive presence of pension funds). Instead only for the EU sample there is presence of insider trading.
The third essay analyzes the contribution of Information&Communication Technology to levels and growth of per capita GDP. The two hypotheses, that ICT adds value to traditional physical capital or removes the "bottlenecks" which limit access to knowledge, improve upon the classical MRW (1992)-Islam (1995) framework. The improvement of "within" country significance in panel estimates documents that this approach captures two dimensions of time varying-country specific technological progress.
The forth essay is dedicated to the study, by a random coefficient model, of the role of technology as a factor which, by affecting women’s empowerment and productivity, have significant effects on fertility decisions. The empirical results show that ICT diffusion has significant negative effect on fertility rates, after controlling for human capital and institutional quality. Moreover this effect is highly heterogeneous across macroareas (five subgroups of countries are optimally identified) because of three latent factors: pro fertility religious norms of Catholic and Islamic culture, the degree of secularization and education of a country, and the digital divide.
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Smith, Jennifer Mae. "Geochemical signatures in the coral Montastraea modern and mid-Holocene perspectives /." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001593.
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Stair, Kristine L. "Assessing the reproducibility of skeletal geochemistry records in Atlantic corals using Montastraea annularis coral heads from the Dry Tortugas, Florida." [Tampa, Fla.] : University of South Florida, 2007. http://purl.fcla.edu/usf/dc/et/SFE0001966.
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Cozma, Codrina. "The power of the spoken word : literature in the American mass media of the 1990s." [Tampa, Fla.] : University of South Florida, 2005. http://purl.fcla.edu/usf/dc/et/SFE0001223.
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Yarkan, Serhan. "Environment, channel, and interference awareness for next generation wireless networks." [Tampa, Fla] : University of South Florida, 2009. http://purl.fcla.edu/usf/dc/et/SFE0003269.
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Somasundaram, Meena Sivalingam. "Pulsed power and load-pull measurements for microwave transistors." [Tampa, Fla] : University of South Florida, 2009. http://purl.fcla.edu/usf/dc/et/SFE0003293.
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Cross, Eric Charles. "Hydrogen isotopic ratios of algal and terrestrial organic matter in Lake Tulane, FL: from a modern calibration to the reconstruction of paleoclimatic and paleohydrologic conditions." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001655.
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Finateu, Thomas. "A direct digital retransmitter based on phase-interpolar direct digital synthesizer and injection locking." Thesis, Bordeaux 1, 2008. http://www.theses.fr/2008BOR13671/document.
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Cette thèse présente un émetteur radio-fréquences, composé d’un synthétiseur numérique de fréquences, lui-même construit autour d’un sigma delta et d’un interpolateur de phase, ainsi que d’un oscillateur verrouillé par injection. Le synthétiseur numérique direct génère des fréquences de 400 à 500 MHz avec une résolution fréquentielle d’au moins 60 Hz. L’oscillateur verrouillé par injection, quand à lui, transpose ces fréquences dans la bande Bluetooth en assurant une multiplication de fréquences par 5. De plus, l’oscillateur verrouillé filtre le bruit de phase du signal d’injection jusqu’à récupérer celui de l’oscillateur libre. La bande passante de l’oscillateur verrouillé par injection peut être programmée numériquement. Cet émetteur a été développée dans une technologie CMOS 65 nm<br>This Ph.D dissertation presents a radio-frequency transmitter, made of a direct digital frequency synthesizer, built around a sigma delta and a phase interpolator, and an injection locked oscillator. The direct digital synthesizer generates frequencies between 400 and 500 MHz with a frequency resolution better than 60 Hz. On the other hand, the injection locked oscillator up-converts synthesizer output up to the Bluetooth band by multiplying frequencies by 5. Moreover, the locked oscillator filters injected signal phase noise up to recover the one of the free running oscillator. The locked oscillator bandwidth can be tuned digitally. This transmitter has been developed on 65-nm CMOS technology
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Zerrouki, Thileli. "Triaxialité et coexistence de forme dans les noyaux proches de la fermeture de couche N = 82 : évolution de forme et rotation magnétique dans ¹⁴¹Nd." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112069/document.
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Ce travail de thèse a été consacré à l'étude des noyaux avec quelques trous dans la fermeture de couche N = 82, qui présente une très riche variété d'excitations à hauts spins. La particularité de ces noyaux est la présence de coexistence de forme (sphérique et/ou triaxiale) à des spins très élevés. Durant ma thèse, j’ai analysé une expérience effectuée avec le multidétecteur Euroball à l’IPHC (Strasbourg) pour l'étude des états de haut spin dans le noyau ¹⁴¹Nd, peuplé en utilisant la réaction de fusion-évaporation : ⁹⁶Zr (⁴⁸Ca, 3n). Nous avons identifié plusieurs bandes à spin élevé et développé le schéma de niveaux jusqu'à une énergie d'excitation et spin de l’ordre de 19 MeV et 81/2⁻ respectivement, qui sont bien plus élevés par rapport à celui publié précédemment (9.4 MeV et 49/2h). Trois nouvelles bandes dipôlaires et trois nouvelles bandes rotationnelles quadrupolaires ont été identifiées. La séquence principale yrast a aussi été étendue jusqu’au spin 61/2⁻.Nous avons réalisé des calculs théoriques détaillés des bandes observées, en intégrant, pour la première fois, les résultats qu’on a obtenus par les modèles Cranked Nilsson-Strutinsky (CNS) et Tilted Axis Cranking (TAC). Une interprétation cohérente de la plupart des bandes observées a été réalisée, qui semblent être basées sur des minimas d’énergies presque sphérique pour les séquences principales, légèrement déformée pour les bandes dipoalires et triaxiale déformée pour les bandes quadrupolaires. La structure de niveau observée dans le noyau ¹⁴¹Nd révèle la capacité des noyaux avec quelques trous dans la fermeture de couche N = 82 à acquérir des formes différentes de tourner autour d'un axe principal ou d'un axe incliné par rapport au système de référence intrinsèque, comme dans le cas des noyaux ¹³⁸Nd et ¹⁴⁰Nd récemment étudiés par notre groupe. Tous ces résultats représentent donc un fort soutien à l'existence de la forme nucléaire triaxiale stable à hauts spins dans cette région de masse<br>This PhD work was devoted to the study of exotic nuclear rotation and stable triaxiality at very high spin. In, nuclei with a few holes in the N = 82 shell closure, which exhibit a large variety of excitations at medium and high spins. The peculiar feature of these nuclei is the existence of coexisting shapes, spherical and triaxial, up to very high spins.During my PhD I analyzed an experiment performed with the Euroball multidetector at IPHC (Strasbourg) for the study of high-spin states in ¹⁴¹Nd populated using the ⁹⁶Zr (⁴⁸Ca, 3n) fusion-evaporation reaction. We have identified several high-spin bands and developed the level scheme up to an excitation energy and spin of 19 MeV and 81/2⁻ , respectively, which are much higher than previously published (9.4 MeV and 49⁄2 ℏ). Three new dipole bands and three new ΔI = 2 rotational bands have been identified. The main yrast sequence was extended up to spin 61/2⁻.A detailed interpretation of the observed bands was performed, for the first time, using theoretical calculations with Cranked Nilsson-Strutinsky (CNS) and the Tilted Axis Cranking (TAC) models. A consistent interpretation of most of the observed bands was realized. They appear to be based on nearly spherical for the main sequence, slightly deformed for the dipole bands and triaxially deformed minima for the ΔI = 2 bands. The observed level structure of ¹⁴¹Nd reveals the capability of the nuclei with a few holes in the N = 82 shell closure to acquire different shapes and to rotate around a principal or a tilted axis relative to the intrinsic reference system, as in the case of the ¹³⁸Nd and ¹⁴⁰Nd nuclei recently studied by our group
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Sahin, Mustafa. "Baseband receiver algorithms for 4G co-channel femtocells." [Tampa, Fla] : University of South Florida, 2009. http://purl.fcla.edu/usf/dc/et/SFE0003283.
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Maia, Roberta de Assis. "Screening de uma bibliotecade expressãode cDNA de cerebelo de rato usando-se como sonda o anticorpo anti-KM+ e expressão de drebinas em displasia cortical focal IIB (DCF IIB) associada com epilepsia de difícil controle medicamentoso." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/17/17140/tde-13052010-153055/.
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p83 é uma proteína com massa molecular aparente de 83 kDa, supostamente ainda não descrita, específica de sistema nervoso, e desenvolvimento regulada. p83 interage fortemente com laminina, Tau, tubulina e heat shock protein 90. p83 foi inicialmente detectada por imunohistoquímica e western blot usando-se um anticorpo anti-lectina KM+ purificado por afinidade. Sua purificação a partir de cérebro de rato está em progresso. Identificar o envolvimento de p83 em processos do Sistema Nervoso Central humano é um passo necessário em direção à compreensão de sua função biológica. Uma biblioteca de expressão de cDNA de cerebelo de rato (Lambda ZAP II, Stratagene) foi submetida ao screening, usando-se um anticorpo específico para isolar o cDNA de p83. O anticorpo anti-KM+ foi pré-adsorvido contra proteínas de E. coli XL1 Blue MRF, antes de ser usado no screening. As membranas foram reveladas por imunodetecção cromogênica (fosfatase alcalina e NBT/BCIP). A análise de todos os clones Lambda ZAP II foi feita por excisão in vivo do fagomídeo pBluescript, subclonagem em E. coli XL1 Blue MRF, purificação do DNA plasmidial e digestão com Eco RI. A seqüência correspondente ao clone isolado foi analisada usando-se ferramentas e bancos de dados do NCBI. A seqüência nucleotídica mostrou identidade com as isoformas A e E de drebrina. As isoformas A e E de drebrina foram detectadas em adulto e embrião, respectivamente. Drebrina A é uma proteína sistema nervoso-específica, desenvolvimento regulada e associa-se com F-actina. Embora drebrina e p83 compartilhem propriedades em comum, nossos dados de western blot indicaram que parecem não se tratar da mesma proteína. Nós investigamos a expressão de drebrina em Displasia Cortical Focal tipo IIB, comparando com córtex normal. As secções de tecido foram coradas com hematoxilina-eosina e prata (Bielchowsky). Secções foram processadas por imunohistoquímica usando-se os anticorpos anti-drebrina M2F6 e o DAS2, e recuperação antigênica. A detecção foi feita usando-se um anticorpo biotinilado, e DAB como cromógeno. Os tecidos displásicos (13 casos) foram obtidos cirurgicamente de tecidos exibindo epilepsia droga-resistente. Os controles foram obtidos de necrópsia de 15 pacientes sem história prévia de doenças neurológicas ou alterações patológicas. Nossos resultados sugerem uma associação entre drebrina e DCF IIB, um distúrbio do desenvolvimento cortical.<br>p83 is 83 kDa protein supposedly not yet described, nervous system specific, and developmentally regulated. p83 strongly interacts with laminin, Tau, tubulin and heat shock protein 90. It was initially detected by immunohistochemistry and western blot using an affinity-purified anti-lectin KM+ antibody. Its purification from rat brain is in progress. Identifying the involvement of p83 in human Central Nervous System processes is a required step towards understanding its biological roles. A premade cDNA rat cerebellum expression library (Lambda ZAP II, Stratagene) has been screened, using a specific antibody to isolate p83 cDNA. Anti-KM+ antibody was pre-adsorbed against E. coli XL1 Blue MRF proteins, before using in screening. Membranes were revealed by cromogenic immunodetection (alcaline fostase and NBT/BCIP). The analysis of all positive Lambda ZAP II clones was carried out by in vivo excision of pBluescript, subcloning in E. coli XL1 Blue MRF, plasmidial DNA purification and Eco RI digestion. The sequence corresponding to the clone isolated was analyzed using the NCBI tools and database. The nucleotide sequence showed identity with drebrin A and E isoforms. Drebrin A and E isoforms were detected in adults and embryos. Drebrin A is a neuron-specific, development-regulated F-actin-binding protein. It participates in growth cone extension and dendritic spine formation. Although have same drebrin and p83 properties in common, they not seem to be the same protein. We have investigated the expression of drebrin in Focal Cortical Dysplasia type IIB (FCD IIB) as compared to normal cortex. Tissue sections were stained with hematoxylin-eosin and silver (Bielchowsky). Sections were processed for immunohistochemistry using anti-drebrin antibodies M2F6 and DAS2, and an antigen retrieval technique. Detection was carried out using a biotinylated antibody, using DAB as chromogen. Dysplastic tissues (13 cases) were obtained at surgery for drug-resistant epilepsy. Controls were obtained at autopsy from 15 patients without history of neurological disorder and gross pathological changes. A specific drebrin labeling in dysplastic tissue was more intense than in controls. Indeed, most control cases exhibited at most a slightly higher staining than the background. Balloon, clear and undetermined cells, and giant, dysmorphic neurons, showed a conspicuous labeling by anti-drebrin. These cells showed a thin rim labeling of the nuclear membrane, and a finely punctate nuclear labeling. In contrast, a coarse nuclear, but a faint cytoplasm labeling was observed in autopsy cases. Our data suggest an association between Drebrin expression and the FCD IIB, a disturbance of cortical development.
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Léguillon, Romain. "Triaxialité et isomèrisme à hauts spins dans les noyaux proches de la fermeture de couche N = 82." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00932123.
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L'existence de noyaux triaxiaux a fait l'objet d'un débat de longue date. La possibilité de la triaxialité mole et rigide a été proposée très tôt, et de nombreuses études théoriques et expérimentales ont été consacrées à ce phénomène intrigant. Plus récemment, deux marqueurs uniques de la triaxialité dans les noyaux ont été intensivement étudiés : le mouvement d'oscillation de l'axe de rotation (wobbling) et la chiralité dynamique. Ces types exotiques de mouvement ont été observées dans des régions spécifiques du tableau nucléaire : le mouvement d'oscillation dans les noyaux de Lu impair-pair avec A ~ 160, la chiralité principalement dans les noyaux impair-impair et pair-impair avec A ~ 130. Nous avons récemment étudié les noyaux de Nd à très hauts spins et identifié plusieurs bandes, qui ont été interprétées comme la manifestation de divers types de mouvement collectif : rotation suivant un axe incliné, rotation suivant les axes longs et courts, mouvement de wobbling et bandes chirales. Un autre phénomène révélé par nos résultats récents sur les noyaux de Nd avec seulement quelques trous neutroniques par rapport à la fermeture de couche N = 82, est la coexistence de forme. En effet, ces noyaux sont prévus pour avoir des isomères de hauts spins construis sur une forme sphérique, coexistant avec des bandes triaxiales, ou des formes très voire super-déformées . Ma thèse se compose de deux expériences. Tout d'abord, j'ai préparé, exécuté et analysé une expérience réalisée au " Research Center of Nuclear Physics " (RCNP) de l' Université d'Osaka . Cette expérience visait à étudier les isomères de hauts spins et à développer les schémas de niveaux des noyaux de 135La, 136La et 136Ba. Nous avons utilisé un faisceau radioactif de 17N de 80 MeV créé par la réaction directe de 18O sur une cible 9Be et sélectionné à l'aide d'un spectromètre achromatique. Le faisceau radioactif de 17N bombardait une cible de 124Sn de 20 mg/cm2 d'épaisseur pour produire les noyaux d'intérêt par une réaction de fusion-évaporation. Cette thèse présente les résultats obtenus pour le 135La, qui comprennent la construction et la discussion du schéma de niveau et la mesure de la durée de vie de deux isomères connus. La deuxième partie de la thèse consiste en l'analyse de deux expériences différentes réalisée en utilisant la même combinaison de faisceau-cible 48Ca + 96Zr à une énergie légèrement différentes et deux dispositifs expérimentaux différents, EUROBALL et JUROGAM II + RITU + GREAT, pour étudier les isotopes du néodyme de 138Nd à 141Nd. Mon travail a été axé sur les noyaux pair-pair de 138Nd et 140Nd, avec un accent particulier sur le 140Nd. La multitude de bandes de spin élevé observées dans ce noyau sont discutées dans le cadre du modèle " Cranked Nilsson - Strutinsky " (CNS) et du modèle " Tilted Axis Cranking " (TAC). Les bandes de hauts spins observées dans les noyaux de 138-141Nd sont toutes interprétées comme basées sur un minimum d'énergie associé à une déformation triaxiale. Elles représentent donc un fort soutien à l'existence de la forme nucléaire triaxiale stable à hauts spins. L'isomère de haut spin 27- a également été identifié dans le 140Nd qui, combinée avec l'isomère 20+ précédemment connu dans le même noyau va permettre d'extraire pour la première fois une valeur expérimentale de la différence d'énergie entre les orbitales πh11/2 et π(d5/2g7/2) à hauts spins.
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Aimer, Younes. "Étude des performances d'un système de communication sans fil à haut débit." Thesis, Poitiers, 2019. http://www.theses.fr/2019POIT2269.
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La demande des usagers en termes de débit, de couverture et de qualité de service croît exponentiellement, avec une demande de plus en plus accrue en énergie électrique pour assurer les liaisons entre les réseaux. Dans ce contexte, les nouvelles formes d’ondes basées sur la modulation OFDM se sont répandues et sont utilisées dans les récentes architectures de radiocommunications. Cependant, ces signaux sont très sensibles aux non-linéarités des amplificateurs de puissance à cause des fortes fluctuations d’enveloppe caractérisées par un fort PAPR qui dégrade le bilan énergétique et le rendement de l’émetteur. Dans ce travail de thèse, nous avons tout d’abord dressé un état de l’art des techniques de réduction du PAPR. Cette présentation nous a permis de proposer une nouvelle méthodologie basée sur les techniques d’entrelacement et de codage. Cette première contribution consiste en l’utilisation de la technique d’entrelacement, en faisant appel aux sous porteuses nulles pour la transmission des informations auxiliaires, tout en respectant les spécifications fréquentielles du standard utilisé. La deuxième contribution est basée sur la combinaison des deux techniques de Shaping et de Transformée en Cosinus Discrète DCT, dans l’objectif d’améliorer davantage les performances du système. Les résultats de simulation ont montré que l’utilisation de ces deux techniques permet un gain significatif en termes de réduction du PAPR, qui se traduit par l’amélioration du rendement. Enfin, nous avons présenté une étude expérimentale pour l’ensemble des techniques proposées afin de confirmer les résultats obtenus en simulation. Ces évaluations sont réalisées avec un banc d'essais de radiocommunications pour le test d'un amplificateur de puissance commercial de technologie LDMOS de 20W, fonctionnant à 3.7 GHz en classe AB. Les résultats obtenus pour les standards IEEE 802.11 montrent que ces nouvelles approches permettent de garantir la robustesse de transmission, d’améliorer la qualité des liaisons et d’optimiser la consommation électrique<br>The request of the users in terms of rate, coverage and quality of service is growing exponentially, with increasing demand for electrical energy, to ensure networks link. In this context, new waveforms based on the OFDM modulation become widely popular and used intensively in recent radio communications architectures. However, these signals are sensitive to the power amplifier nonlinearities because of their high envelope fluctuations characterized by a high PAPR, which degrades the energy consumption and the transmitter efficiency.In this thesis, we first began by a state art of the PAPR reduction techniques. This presentation allowed us to propose a new method based on interleaving and coding techniques. The first contribution consists on the use of the interleaving technique using null-subcarriers for the transmission of the side information, while respecting the frequency specifications of the used standard. The second one is based on the conjunction of the Shaping technique and the Discrete Cosine Transform (DCT), with the aim of improving the performance of the system. Simulation results show that the use of these two techniques allows a significant gain in terms of PAPR reduction, which results in the improvement of the system efficiency. Finally, we presented an experimental study of the proposed techniques using an RF test bench with a commercial LDMOS 20 W PA, class AB operating at 3.7 GHz. The results obtained for the IEEE 802.11 standards show that the proposed approaches allow the transmission robustness and quality, while optimizing the power consumption
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Afifi, Mohammed Ahmed Melegy Mohammed. "TCP FTAT (Fast Transmit Adaptive Transmission): A New End-To- End Congestion Control Algorithm." Cleveland State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=csu1414689425.
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Novotný, Tomáš. "Náklady vlastního kapitálu pro tržní ocenění podniku v podmínkách ČR s důrazem na rizikovou prémii kapitálového trhu." Master's thesis, Vysoká škola ekonomická v Praze, 2012. http://www.nusl.cz/ntk/nusl-199061.
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The aim of the work is to analyze the theoretical basis of determination of the market risk premium in conditions of the national market in the Czech Republic with CAPM and practical procedures of its determination using the market data provided by Bloomberg. The work addresses some open problems of practical determination of market risk premium as a choice between historical and implied risk premium, determination of credit spread as a representative of country risk and accurate determination of the equity and bond market volatility ratio. The thesis also contains research on the cost of equity and single-factor sensitivity analysis demonstrating the significant influence of a small change in one parameter entering the calculation of the discount rate on the resulting value.
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Zaylaa, Amer. "Multichannel EHG segmentation for automatically identifying contractions and motion artifacts." Thesis, Compiègne, 2019. http://www.theses.fr/2019COMP2521.
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Dans cette étude, nous avons mis l’accent sur la segmentation automatique des évènements dans le signal EMG utérin et l’identification ensuite des contractions parmi ces évènements en se référant aux données de l’expert. Notre base de données comprend des signaux EMG utérins de différentes semaines de gestation acquis grâce à une matrice de 4x4 électrodes. Par conséquent, notre travail a compris tout d’abord une application de la méthode de somme cumulé dynamique (DCS) en approche monodimensionnelle sur les signaux monopolaires afin d’obtenir une grande résolution spatiale des données. Suite aux résultats obtenus, notre étude a porté sur les signaux bipolaires afin d'augmenter le rapport signal/bruit (SNR) des EMG utérin. En fait, la méthode DCS a continué en y associant une série des techniques d’éliminations des fausses ruptures détectées, soit basée sur Fisher, soit sur le SNR d’une part, et en développant des méthodes de fusion de ces ruptures d’autre part : l’une automatique tandis que l’autre est basée sur le système de vote à la majorité pondérée où chaque canal est pondéré par un facteur lors de la fusion des instants de ruptures détectés. De plus, la méthode DCS est appliquée en approche multidimensionnelle, tout d’abord sur ces signaux bipolaires, ensuite sur leurs détails après décomposition en ondelettes. En fait, nous sommes intéressés à la sélection dynamique de ces détails dans les deux approches en utilisant une technique basée sur la distance Kullback Leibler. Enfin et dans le but d’identifier les contractions et de réduire le nombre des autres évènements détectés, un essai d’extraction des paramètres de ces évènements obtenus est présenté et validé<br>In this study , we have focused on the automatic segmentation of events in the uterine EMG signal and then on the identification of contractions among these events by referring to the expert's knowledge. Our database includes uterine EMG signals of different weeks of gestation acquired through a matrix of 4x4 electrodes. Therefore, our work has first included an application of the dynamic cumulative sum (DCS) method in a monodimensional approach on monopolar signals in order to obtain a high spatial resolution of the data. Based on the obtained results, our study has then focused on bipolar signals in order to increase the signal-to-noise ratio (SNR) of uterine EMGs. In fact, the DCS method has continued by associating first a series of techniques for the elimination of false detected ruptures either based on Fisher or on the SNR and by developing secondly two fusion methods of these ruptures : the firts one is automatic while the other one is based on the weighted majority voting system, where each channel is weighted by a factor when merging the instants of detected ruptures. In addition, the DCS method is applied in a multidimensional approach, first on the bipolar signals, then on their details after wavelet decomposition. Infact, we were interested in the dynamic selection of these details in both approaches by using a technique based on the Kullback Leibler ditance. Finally, in order to indentify the contractions and reduce the number of other detected events, an assay of parameters extraction of these obtained events has been presented and validated
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Krchňavý, Jan. "Akvizice a předzpracování MRI obrazových sekvencí pro klinické perfusní zobrazování." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219512.
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This thesis describes the theory for static and dynamic magnetic-resonance imaging using contrast agents affecting T1 relaxation time. The available acquisition methods in the specified facility of Masaryk Oncological Institute in Brno are described. The sequences for subsequent experimental measurements are selected. The used phantoms are described. Acquisition protocol for measuring is described briefly and the evaluation method for the measured data is suggested. The best acquisition sequence and a method of measurements is chosen influenced by estimation of relaxation time T1, sensitivity and signal to noise ratio. Perfusion analysis is executed and perfusion parameters are calculated. The work was supported by the European Regional Development Fund and the State Budget of the Czech Republic (RECAMO, CZ.1.05/2.1.00/03.0101).
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Lee, Chih-Peng, and 李志鵬. "Evaluation of the progressive collapse potential of an RC building frame subjected to different column-loss scenarios by using the demand-capacity ratio (DCR)." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/70508036419523006832.
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碩士<br>國立屏東科技大學<br>土木工程系所<br>103<br>Abstract
Student ID：N9733004 Total Pages：64
Title of Thesis：Evaluation of the progressive collapse potential of an RC building frame subjected to different column-loss scenarios by using the demand-capacity ratio (DCR)
Name of Institute：National Pingtung University of Science and Technology
Name of Department：Department of Civil Engineering
Date of Graduation：May, 2015 Degree Conferred：Master
Adviser： Tsai, Meng-Hao Lu, Jun-Kai
Name of Studennt：Lee, Chih-Peng
The Contents of Abstract in this Thesis：
Linear static analyses were conducted in this study to evaluate the progressive collapse potential of a ten-story RC building frame. The analysis procedure recommended in the UFC 4-023-03 design guidelines was adopted. The demand-to-capacity ratio (DCR) of beam-end moment was used to evaluate the collapse potential of the building frame. Three difference column-loss locations at each of the first, second, sixth, and top stories were considered in linear static analyses. The analysis results indicated that removal of the peripheral and penultimate column in the longitudinal direction led to highest progressive collapse potential for the RC building frame. Also, larger DCR ratios were obtained for the removal of a higher-story column, which indicated that higher stories were more vulnerable to partial collapse under column-loss conditions. Even though, the collapse risk of the building frame was low according to the acceptance criterion suggested in the UFC guidelines. This implied a seismically designed RC building frame may have superior collapse resistance against column loss.
Keywords:Linear static analysis, demand-to-capacity ratio, progressive collapse
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Chen, Nash, and 陳昱宏. "Optimal Hedge Ratio of Commodity Futures Using Bivariate DCC-CARR and DCC-GARCH Models." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/83027752092707981578.
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碩士<br>國立中央大學<br>財務金融研究所<br>93<br>When traders participate in both cash and futures markets they must choose a hedging strategy that reflects their individual goals and attitudes towards risk. At the same time, optimal portfolio management depends not only on the fundamental and technological analysis in maximizing returns, but it also encompasses diversification techniques in (un)systematic risk. Nevertheless, systematic risk can be effectively eliminated by futures contracts.
In this thesis, we focus on diversification to minimize the portfolio variance and will consider the minimum-variance hedge strategy because the benefits of sophisticated estimation techniques of the hedge ratio are small (Lence, 1995b). At first, we take the commodity prices, and then compute the Optimal Hedge Ratios (OHRs) between spot and futures using different methods. Here, the hedge ratios are used to hedge the spot price risk in simulations of investment.
In analysis, we use the Dynamic Conditional Correlation - Conditional Autoregressive Range (DCC-CARR) model proposed by Chou et. al. (2005) to compute the OHRs. Other alternative methods used for comparison include the ordinary least squares (OLS) estimator which provides an estimate for the minimum-variance hedge ratio, Constant Conditional Correlation –Generalized Autoregressive Conditional Heteroskedasticity and CARR (CCC-GARCH and CCC-CARR) models, and DCC-GARCH model.
Different methods used to compute hedge ratios are compared with each other in their performance of variance-reduction. While the spot price risk is hedged by their corresponding futures, within-sample hedge, the results show that the DCC-CARR model performs better than the other hedge models for the selected commodities with the exception of gold. For an out-sample hedge in one-period it supports that the DCC-CARR model is the best model for any commodity. But, in other period, the results are mixed because of the trading noises. In conclusion, we suggest that the DCC-CARR model is the better model for investors to find the minimum-variance of a portfolio.
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Weng, Ni-Ling, and 翁妮鈴. "Optimal Hedge Ratio of Energy Futures Using CCC and DCC Models." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/71366762412200080538.
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碩士<br>國立交通大學<br>經營管理研究所<br>95<br>Crude oil keeps country’s economy running, and crude oil futures is one of the most actively traded commodity, as well as the world's largest-volume futures contract trading on a physical commodity. Energy price is highly dependent on global macroeconomic conditions, and what amount of energy futures contracts should be purchased to minimise the risk of holding spot energy is important issue in recent years.
This research applies various methods in minimum-variance hedge strategy, and computes the Optimal Hedge Ratios (OHRs) between the amount of spot and futures for energy commodity prices using different econometric methods. Namely, using Dynamic Conditional Correlation, and DCC-CARR model proposed by Chou et. al. (2005) to compute OHRs. Other methods used for comparison include the ordinary least squares (OLS) estimator, Constant Correlation models and so on.
The research period is from 1995 to 2007, and daily data is collected. Different methods are compared with each other in their hedging performance of variance-reduction. For the out of sample hedge, the CCC or DCC model is the best one for three commodities, and could to find the minimum-variance of a portfolio for investor. In conclusion, dynamic hedging model is better than the traditional OLS model. Meanwhile, the optimal hedge ratio is not constant, it should be time-varying.
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駱有聲. "A study on high compression ratio DCT image coding with blocking effects reduction." Thesis, 1990. http://ndltd.ncl.edu.tw/handle/24896974416994108695.
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Liu, Mingwei. "Differential Code-Shifted Reference Impulse-Radio Ultra-Wideband Receiver: Signal Strength Adjustment and Implementation." 2014. http://hdl.handle.net/10222/50417.
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IR-UWB is a wireless system, which sends information data with pulses that have rapid rising and falling time and very short duration of nanosecond or less. However, due to varying communication channel conditions, amplitude of the received signal is not at a constant level. Therefore, automatic signal strength adjustment is required to equalize the impact of variations of the channel conditions.
In this thesis, two approaches based on automatic gain control technique are proposed. The first design is a feed-forward automatic gain control system working at baseband. The second design is a feedback automatic gain control system operating at radio or microwave frequency. The corresponding simulation and implementation results are provided to validate the designs. The proposed designs present signal strength controls for impulse-based transceiver systems which are not often addressed in the literature.
It is found that the first design does not work well in reality due to the fact that it essentially operates in the baseband and has no impact on the strong or weak signals right after the receiver antenna. The second design functions quite well and presents a dynamic range of 179mV to 1.062V. As a result, it is the choice of this thesis work.
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Arieira, Flávia Maria Correia. "Uma nova forma de dar e receber a informação: A app da TSF." Master's thesis, 2017. http://hdl.handle.net/10316/85525.
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Relatório de Estágio do Mestrado em Comunicação e Jornalismo - extinto apresentado à Faculdade de Letras<br>A rádio é para muitos o verdadeiro meio de comunicação de massas, uma vez que é o órgão que melhor se adapta aos desafios que lhe são colocados. É um meio para ser ouvido e, assim, necessita que a sua linguagem chegue a todos os ouvintes. Para isso, esta tem que ser simples e direta; além disso a rádio é um meio que precisa de estar em constante atualização fazendo parte, por isso, das rotinas do jornalista a rapidez na produção das notícias. No entanto, com o advento da Internet e com a revolução tecnológica, a rádio está a atravessar um período de transição e por isso vê-se obrigada a pensar na sua essência e a adaptar-se ao contexto digital. A interatividade, promovida pela Internet, favoreceu o contacto entre os jornalistas e os ouvintes; este estímulo à participação dos utilizadores põe termo à passividade da audiência (Cordeiro, 2004b). Deste modo, as rádios começaram, numa tentativa de se reaproximarem dos ouvintes, a apostar cada vez mais no online. As principais rádios criaram páginas web e estão presentes nas redes sociais. Recentemente, começaram a apostar em aplicações para os dispositivos móveis, como é exemplo a rádio TSF. O presente relatório será uma reflexão sobre a aplicação da TSF para dispositivos móveis. A ideia surgiu no decorrer do estágio curricular que fiz na rádio TSF durante um período de três meses. Ao longo do estágio consegui perceber que a Internet, por um lado, é uma importante ferramenta de trabalho para os jornalistas, uma vez que permite um acesso rápido à informação e aos contactos com os jornalistas e fontes de informação, ao mesmo tempo que lhes dá autonomia e permite que eles não tenham de sair da redação para obterem a informação que necessitam. Por outro lado, não sair da redação nem sempre traz vantagens para o trabalho jornalístico, uma vez que com o trabalho a partir da Internet, os jornalistas atualizam-se a partir das mesmas agências de notícias e isso conduz a uma homogeneidade dos conteúdos nos diferentes meios de comunicação.O estágio permitiu chegar ao tema deste trabalho “uma nova forma de dar e receber a informação: a app da TSF”. Este pareceu-me pertinente devido ao contexto em que vivemos, o da era digital, no qual os meios de comunicação precisam de se adaptar à Internet e tirar proveito das suas funcionalidades. Mas, também, porque cada vez menos as pessoas procuram a informação nos meios tradicionais. Esta procura-se nas páginas da Internet e nas redes sociais. Neste contexto, surgem, também, as aplicações para dispositivos móveis. Com a utilização das aplicações, não precisamos de procurar a informação, uma vez que basta ter um dispositivo móvel, como o telemóvel ou o tablet, com Internet, para termos acesso à informação, já que estas aplicações, normalmente, são gratuitas. As aplicações são gratuitas, mas os conteúdos nem sempre.Para se adaptar ao meio, a TSF criou uma aplicação para dispositivos móveis como forma de fidelizar leitores/ouvintes. Através da app é possível que a rádio mantenha a sua essência, uma vez que dá as notícias em primeira mão. Esta tem outra particularidade: envia notificações push . Portanto, o público-alvo não tem de procurar a informação, ela chega aos dispositivos móveis através do alerta.Com este relatório pretendemos fazer uma reflexão sobre esta nova forma de dar e receber a informação, apoiando-se na perceção que os jornalistas têm da aplicação criada pela sua rádio. Para isso, foram realizadas entrevistas a alguns jornalistas da TSF, com o intuito de reunir dados que contribuem para perceber quais as razões que levaram à criação da aplicação, mas também se esta ajuda, de facto, a fidelizar leitores, e ainda que benefícios traz para o meio, para os jornalistas e para o fazer “rádio”. Quanto à estrutura, este relatório será dividido em dois capítulos. No primeiro vamos fazer uma contextualização histórica do meio de comunicação onde foi realizado o estágio e, posteriormente, vamos descrever a experiência tida durante os três meses na TSF.No segundo capítulo, abordaremos a questão da Internet como fator de mudança para o jornalismo. Muito se fala acerca das mudanças que a web trouxe à prática jornalística, por isso, é importante perceber de que forma condiciona a rotina dos jornalistas nas redações. Neste contexto, torna-se essencial perceber como é que a rádio se está a adaptar ao meio digital. Analisaremos em seguida os desafios que esta trouxe para os jornalistas e para o meio. Para analisarmos o tema principal deste relatório de estágio, vamos estudar os dispositivos móveis e o jornalismo, mais concretamente o uso do telemóvel, uma vez que este aparelho é o mais usado pelas pessoas no seu quotidiano. De acordo com Patrícia Dias “O telemóvel faz parte da nossa rotina, e se pensarmos na sua importância, provavelmente concluiremos que é pelo menos tão importante como o automóvel ou a televisão (Dias, 2008, p.9).<br>Radio is for many the true means of mass communication, since it is the organ that best adapts to the challenges posed to it. It is a medium to be heard and thus requires that your language reach all listeners. For this, it has to be simple and direct; In addition, radio is a medium that needs to be constantly updated, making it part of the journalist's routines to be quick to produce the news. However, with the advent of the Internet and the technological revolution, radio is going through a transitional period and so it is forced to think about its essence and adapt to the digital context. The interactivity, promoted by the Internet, favored the contact between the journalists and the listeners; This stimulus to user participation ends the passivity of the audience (Cordeiro, 2004b). In this way, the radios began, in an attempt to get closer to the listeners, to bet more and more on the online. The main radios have created web pages and are present in social networks. Recently, they started betting on applications for mobile devices, such as the TSF radio.This report will reflect on the implementation of TSF for mobile devices. The idea arose during the course of the curriculum I did on TSF radio over a period of three months. Throughout the internship I have come to realize that the Internet, on the one hand, is an important working tool for journalists, as it allows quick access to information and contacts with journalists and sources of information, while giving them Autonomy and allows them not to leave the newsroom to get the information they need. On the other hand, not leaving the newsroom does not always have advantages for the journalistic work, since with the work from the Internet, the journalists are updated from the same news agencies and this leads to a homogeneity of the contents in the different media.The stage allowed us to arrive at the theme of this work "a new way of giving and receiving information: the TSF app". This seemed to me pertinent due to the context in which we live,the digital era in which the media need to adapt to the Internet and take advantage of its features. But also, because less and less people seek information in the traditional media. This is searched on websites and social networks. In this context, there are also applications for mobile devices. With the use of the applications, we do not need to look for the information, since it is enough to have a mobile device, such as a mobile phone or tablet, with Internet, to have access to information, since these applications are usually free. Applications are free, but content is not always.To adapt to the environment, TSF has created an application for mobile devices as a means of loyalty to readers / listeners. Through the app it is possible that the radio maintains its essence, since it gives the news first hand. This has another particularity: it sends push notifications. Therefore, the target audience does not have to search the information, it reaches the mobile devices through the alert.With this report we intend to reflect on this new way of giving and receiving information, based on the perception that journalists have of the application created by their radio. To this end, interviews were conducted with some journalists from TSF, in order to gather data that helps to understand the reasons that led to the creation of the application, but also if this helps, in fact, to retain readership, and even For the media, for the journalists and for the "radio".As regards structure, this report will be divided into two chapters. In the first one we will make a historical contextualization of the means of communication where the internship was carried out and, later, we will describe the experience during the three months in the TSF.In the second chapter, we will address the Internet as a change factor for journalism. Much is said about the changes that the web has brought to the journalistic practice, so it is important to realize how it conditions the routine of journalists in newsrooms. In this context, it becomes essential to realize how radio is adapting to the digital environment. We will then look at the challenges it has brought to journalists and the media.To analyze the main theme of this internship report, we will study mobile devices and journalism, specifically the use of mobile phones, since this device is the most used by people in their daily lives. According to Patrícia Dias "The mobile phone is part of our routine, and if we think about its importance, we will probably conclude that it is at least as important as the automobile or the television" (Dias, 2008, p.9).
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Arabi, Tamim. "Pulse Synchronization and Timing Recovery in Differential Code-Shifted Reference Impulse-Radio Ultra-Wideband (DCSR IR-UWB) System." 2013. http://hdl.handle.net/10222/21853.
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Ultra-wideband (UWB) is a revolutionary radio communication system that utilizes a large portion of the frequency spectrum while maintaining low power levels and high data rates. UWB systems can be used both indoors and outdoors within the power-level masks regulated by the Federal Communications Commission, thus making the technology very versatile. One of the main advantages of UWB is its robustness to multi-path diversity. The technology has attracted the interests of research and industry alike, owing to the possibility of implementing low-power, low-complexity, and low-cost devices.
A widely recognized method of transmitting UWB signals is the use of Impulse Radio technology to transmit information. Impulse Radio Ultra-Wideband (IR-UWB) uses repetitive pulses of very short duration, low duty cycle, and low power levels within FCC regulations. One implementation of IR-UWB pulses in non-coherent transmission is the use of Differential Code-Shifted Reference (DCSR) pulses. In this technique, one of the main challenges at the receiver is pulse-level synchronization that times the received pulses at the right moments for accurate pulse detection.
This thesis will introduce two design proposals in attempt to achieve the pulse synchronization. The first proposal is based on a fast-switch-controlled integrator circuit, while the second focuses on the use of an active low pass filter and phase-locked loop circuits to achieve proper clock timing. Both proposals will be presented, together with schematics, computer-aided simulations, and lab tests results.
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Kůs, David. "Matematické metody konstrukce investičních portfolií." Master's thesis, 2013. http://www.nusl.cz/ntk/nusl-321348.
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This thesis describes statistical approaches of investment portfolio constructions. The theoretic part presents modern portfolio theory and specific statistical methods used to estimate expected revenue and risk of portfolio. These procedures are specifically selection method, modelling volatility using multivariate GARCH model, primarily DCC GARCH procedure and Bayes approach with Jeffrey's and conjugated density. The practical part of the thesis covers application of above mentioned statistical methods of investment portfolio constructions. The maximization of Sharp's ratio was chosen as optimization task. Researched portfolios are created from Austria Traded Index issues of shares where suitable time series of historical daily closed prices. Results attained within assembled portfolios in two year investment interval are later compared.
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Chen, Yu-lang, and 陳玉郎. "APPLIES VOLATILITY SPILLOVER AND MRS-DCC-GARCH MODEL TO INVESTIGATE THE OPTIMAL HEDGE RATIO OF HONG KONG STOCK INDEX AND RELATED FUTURES MARKET." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/97490560429694655792.
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碩士<br>銘傳大學<br>經濟學系碩士班<br>96<br>This thesis applies MRS-DCC-GARCH (Markov Regime Switching -Dynamic Conditional Correlation -Generalized Autoregressive Conditional Heteroskedasticity) Model, and VS-DCC-GARCH (Volatility Spillover -Dynamic Conditional Correlation -Generalized Autoregressive Conditional Heteroskedasticity) Model to investigate the optimal hedge ratio of Hong Kong Hang Seng stock index and related futures market. The rationale behind the use of these models stems from the fact that the dynamic relationship between spot prices and futures returns may be characterized by regime shifts. The empirical results show that MRS-CCC-GARCH model performs better than the other models.