Дисертації з теми "Varmgas"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-47 дисертацій для дослідження на тему "Varmgas".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
Ausmeel, Erik, and Botvid Gannholm. "Dataanalys av en ny avfrostningsrutin på en kyl- och frysanläggning : En studie gjord hos Freezing Food Småland Öland AB." Thesis, Linnéuniversitetet, Sjöfartshögskolan (SJÖ), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-105008.
This report is about a change in the food company Freezing Food Småland Öland AB’s defrosting routine for their evaporators in the freezer warehouse. The change was that the defrosting time and maximum temperature were reduced and that the time between defrostings now takes place every other night instead of every night. The aim was to examine whether the change in the routine had contributed to a reduction in energy consumption compared to before the change was made by also examining factors other than defrosting itself that might affect energy consumption. The method was to collect and analyze large amounts of data provided by the company and then reduce them to manageable figures. Data for local outdoor temperatures were also collected. This calculated averages for a given time period for energy consumption, warehousing and outdoor temperature. The results showed a decrease in energy consumption, the proportion due to the change in defrosting procedures left the investigation unanswered. The outdoor temperature should have reduced the power requirement, at the same time the storage should have increased it. It was concluded that more time needed to pass,and a new study needed to be produced after the defrosting routine was changed to allow for a safer assessment.
Marttila, S. (Sami). "Hallinnolliset verkkopalvelut nuorten näkökulmasta:”Varmaan googlaisin ekka”." Master's thesis, University of Oulu, 2017. http://urn.fi/URN:NBN:fi:oulu-201711093090.
Topno, Neral. "Vr̥ndāvanalāla Varmā ke upanyāsoṃ meṃ caritra-citraṇa /." Dilli : Rāja pabliśiṅga hāusa, 1993. http://catalogue.bnf.fr/ark:/12148/cb37028226x.
Le dos de la page de titre porte la mention : "Vrindavan Lal Verma ke upanyson main charitra-chitaran" / by Neral Topno. Bibliogr. p. 121-127. Notes bibliogr.
Hung, Perry L. "Varmosa : just-in-time binary translation of operating system kernels." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/53141.
Includes bibliographical references (p. 57-58).
This thesis presents a just-in-time binary translation scheme that dynamically switches between system emulation with a slower but more memory efficient instruction interpreter, and a faster, more memory intensive binary translator. In testing, this hybrid interpreter/translator scheme reduced the size of the binary translation cache by up to 99% with a slowdown less than a factor of 5x in the worst case, and less than a 2x in the best case compared to a pure binary translation scheme. With only a 10% decrease in performance, upwards of 49% memory reduction is demonstrated. Additionally, a technique of guest kernel introspection and profiling using binary translation is presented.
by Perry L. Hung.
M.Eng.
Kokko, T. (Tiia). "”Mulla meni varmaan pointti ohi nyt kokonaan?”:mulla-konstruktion semanttista tarkastelua." Master's thesis, University of Oulu, 2019. http://jultika.oulu.fi/Record/nbnfioulu-201904091446.
Sabtti, Shahed. "Påverkas mätvärdet för IOP efter behandling med varma ögonkompresser?" Thesis, Linnéuniversitetet, Institutionen för medicin och optometri (MEO), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-75660.
Reddycherla, Amarendra Varma [Verfasser]. "Regulation of T cell activation by miRNAs / Amarendra Varma Reddycherla." Magdeburg : Universitätsbibliothek, 2017. http://d-nb.info/1138276596/34.
Persson, Robin. "Utredning av isbildning på låglutande varma tak i norra Sverige." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-149158.
Ourclimate is changing ata rapid speed whichleads to older constructions with less thermal insulationhaving a higher chance of experiencingproblems with ice on roofs. This could also become a problem for future construction if not the right amount of insulationis chosen.The intention of this thesis is to investigateif it’s possible for ice formations on roofs with low slopewhen theinside temperature is20°C.The goal is to prove with calculations and simulations if there is any chance of ice toform on the roof constructions.The thesis will be carried out with calculations for a stationary one-dimensional heat transport together with the simulation program WUFI Pro to be able to make comparisons in the results.The results display that the choice of insulationinfluences the condition of snow melting on the roofs. However, the snow depths havea greater influence on the hours of snow melting.In conclusion, the thickness of the insulationcan make a difference for ice formation even though the snow itself has a higherimpact.
Li, Yingzi. "Varma modelling for window size and RTT in TCPIP networks." Thesis, University of Ottawa (Canada), 2004. http://hdl.handle.net/10393/26690.
Kerala, Varma Vipin [Verfasser]. "Critical, statistical, and thermodynamical properties of lattice models / Vipin Kerala Varma." Bonn : Universitäts- und Landesbibliothek Bonn, 2013. http://d-nb.info/1045276502/34.
Tivefälth, Richard, and Oskar Almstedt. "Webbapplikation med industriell IT-lösning : Demoprototyp av produktionslinjen Det varma flödet." Thesis, Karlstads universitet, Institutionen för matematik och datavetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-55073.
Manufacturing systems uses control systems to monitor and control the production. The company Outokumpu has a production in Degerfors for rolling stainless steel, called The Heated Stream. The current system is monitored and controlled by an application that only works in Windows environment. By having the system more flexible and making the monitoring of the production available on other devices such as tablets or to get the information on the internet. Our project is a prototype of a real-time web application which will simulate the production with different scenarios. The user of this application will be informed with position of the material currently in production, statistics about the production, a machince downtime and the fill ratio of the ovens. The real-time application has been developed using the framework ASP.NET Core and the JavaScript language TypeScript working with the framework Aurelia. For future development of the prototype, all features from the current system could be implemented such as to control the production line from the web application and not just to monitor the system.
Alj, Abdelkamel. "Contribution to the estimation of VARMA models with time-dependent coefficients." Doctoral thesis, Universite Libre de Bruxelles, 2012. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209651.
vectoriels ou VARMA, `a coefficients dépendant du temps, et avec une matrice de covariance
des innovations dépendant du temps. Ces modèles sont appel´es tdVARMA. Les éléments
des matrices des coefficients et de la matrice de covariance sont des fonctions déterministes
du temps dépendant d’un petit nombre de paramètres. Une première partie de la thèse
est consacrée à l’étude des propriétés asymptotiques de l’estimateur du quasi-maximum
de vraisemblance gaussienne. La convergence presque sûre et la normalité asymptotique
de cet estimateur sont démontrées sous certaine hypothèses vérifiables, dans le cas o`u les
coefficients dépendent du temps t mais pas de la taille des séries n. Avant cela nous considérons les propriétés asymptotiques des estimateurs de modèles non-stationnaires assez
généraux, pour une fonction de pénalité générale. Nous passons ensuite à l’application de
ces théorèmes en considérant que la fonction de pénalité est la fonction de vraisemblance
gaussienne (Chapitre 2). L’étude du comportement asymptotique de l’estimateur lorsque
les coefficients du modèle dépendent du temps t et aussi de n fait l’objet du Chapitre 3.
Dans ce cas, nous utilisons une loi faible des grands nombres et un théorème central limite
pour des tableaux de différences de martingales. Ensuite, nous présentons des conditions
qui assurent la consistance faible et la normalité asymptotique. Les principaux
résultats asymptotiques sont illustrés par des expériences de simulation et des exemples
dans la littérature. La deuxième partie de cette thèse est consacrée à un algorithme qui nous
permet d’évaluer la fonction de vraisemblance exacte d’un processus tdVARMA d’ordre (p, q) gaussien. Notre algorithme est basé sur la factorisation de Cholesky d’une matrice
bande partitionnée. Le point de départ est une généralisation au cas multivarié de Mélard
(1982) pour évaluer la fonction de vraisemblance exacte d’un modèle ARMA(p, q) univarié. Aussi, nous utilisons quelques résultats de Jonasson et Ferrando (2008) ainsi que les programmes Matlab de Jonasson (2008) dans le cadre d’une fonction de vraisemblance
gaussienne de modèles VARMA à coefficients constants. Par ailleurs, nous déduisons que
le nombre d’opérations requis pour l’évaluation de la fonction de vraisemblance en fonction de p, q et n est approximativement le double par rapport à un modèle VARMA à coefficients
constants. L’implémentation de cet algorithme a été testée en comparant ses résultats avec
d’autres programmes et logiciels très connus. L’utilisation des modèles VARMA à coefficients
dépendant du temps apparaît particulièrement adaptée pour la dynamique de quelques
séries financières en mettant en évidence l’existence de la dépendance des paramètres en
fonction du temps.
Doctorat en Sciences
info:eu-repo/semantics/nonPublished
Chow, Chi-kin. "Some contributions to estimation in advanced time series models--VARMA and BSM." HKBU Institutional Repository, 1991. https://repository.hkbu.edu.hk/etd_ra/6.
Malmquist, Håkansson Johanna, and Linares Beika Portocarrero. "Människans uppfattning om färgtemperatur : Utvärdering av varma och kalla färgtemperaturer vid olika badrumsaktiviteter." Thesis, Högskolan i Jönköping, Tekniska Högskolan, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-47203.
Varma, Disha [Verfasser]. "Role of antimicrobial peptides in metabolism and innate immunity in Drosophila melanogaster / Disha Varma." Bonn : Universitäts- und Landesbibliothek Bonn, 2014. http://d-nb.info/1058400495/34.
Arslan, Tursic. "Varma och kalla färger som stöd för karaktärsdesignprocessen. : En studie inom Concept Art för datorspel." Thesis, Högskolan i Skövde, Institutionen för kommunikation och information, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-5008.
Rosell, Jessica. "Hästens skyddsanvändning under varma sommardagar : En litteraturstudie om hur solstrålning, värme och insekter påverkar hästens välfärd." Thesis, Linnéuniversitetet, Institutionen för biologi och miljö (BOM), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-96771.
Horses are heat resistant animals with good ability to regulate their heat balance, thus instinctively seek protection from the sun and heat. In this study, solar radiation and heat are being investigated and how these factors affect horses as well as the use of sheltering in hot weather, to determine if it is of importance for the welfare of horses. The method is a literature study, in which several different scientific studies have been investigated and summarized. The results show that horses seek varying shelter under warm weather conditions for different reasons. The main reason is governed by insect harassment and partly to regulate its heat balance. Horses that have had access to shelter have used them extensively, while horses that haven’t had access to them have used wind. Different horse breeds have also shown to use shelter in different ways during hot days. Horses have also shown preferences on various shelter designs, where three walls with ceiling have been most popular. The use of shelter appears to be important for horses and benefits their welfare, as it expresses natural behavior and comfort. Shelters can therefor improve comfort and welfare for horses by allowing them to express highly motivated behaviors.
Lönnroth, Jonas. "Vita varma relationer : En kritisk diskursanalys av hur 'vita' och 'icke vita' barn och föräldrar representeras i läromedel." Thesis, Umeå universitet, Institutionen för socialt arbete, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-186126.
The aim of this thesis is to investigate how children and parents with different skin color andethnicities are represented in a selection of textbooks. The books deal with various aspects of children's development and are included as course literature in educations in social work, psychology and pedagogy in Sweden. The study is based on a critical discourse theory as described by Norman Fairclough. In the analysis, I investigate how texts and images in the books relate to already existing discourses about race and ethnicity and I further on discuss how such ideas could affect a broader social practice. Do the authors reinforce existing stereotypical images or do they challenge and transcend them? The analysis of the material demonstrate that the authors, consciously or unconsciously, reproduce racist discourses and stereotypical notions about ‘non white’ children and parents. Among other things, the authors place the responsibility for exclusion on the individual, as the authors do not include structural explanations in their answer to why some people are or feel excluded. The authors draw their conclusions about ‘non west’ children and parents belonging to non white groups, on examples collected from rural environments, often from 'tribal peoples' or extremely poor slum areas, and from other time periods. Through this selection procedure, rural places on the African continent, are compared to an urban European environment, which creates a dichotomous image of the world: The 'modern West' and the 'oldfashioned Rest'. As the textbooks examined are included in education for future social workers, the authors' representations of ethnicity and skin color risk reinforcing prejudices that might affect social work in practice. It is important for educational institutions to pay attention to teaching materials that lack a diversity perspective, and it might be necessary to supplement the teaching by broadening the representation with other descriptions and images.
Gudmundson, Lina, and Amanda Hedberg. "Färg möter förväntningar : - en kvantitativ studie om hur färg påverkar förväntningarpå ett restaurangbesök." Thesis, Linnéuniversitetet, Institutionen för marknadsföring (MF), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-75291.
Qi, Jing. "Application of Intervention Analysis to Evaluate the Impacts of Special Events on Freeways." FIU Digital Commons, 2008. http://digitalcommons.fiu.edu/etd/71.
Love, Barnaby Stuart. "Real-time extraction of the Madden-Julian oscillation using empirical mode decomposition and statistical forecasting with VARMA and neural network models." Thesis, University of East Anglia, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.504851.
Lindqvist, Ottilia. "”värkliga varma svenska hem” : En museologisk undersökning av den svenska hembygdsrörelsens och de svenskahembygdsgårdarnas roll och funktion både historiskt sett och idag." Thesis, Umeå universitet, Institutionen för kultur- och medievetenskaper, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-161209.
Tonner, Jaromír. "Overcomplete Mathematical Models with Applications." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-233893.
Varma, Nitin [Verfasser], Michael [Akademischer Betreuer] Mann, and Ravi [Akademischer Betreuer] Ahuja. "Producing tea coolies? : Work, life and protest in the colonial tea plantations of Assam, 1830s- 1920s / Nitin Varma. Gutachter: Michael Mann ; Ravi Ahuja." Berlin : Humboldt Universität zu Berlin, Philosophische Fakultät III, 2013. http://d-nb.info/1046073907/34.
Gripevall, Sarah, and Cassandra Karnhag. "Kriskommunikation : Hur företag med hjälp av en modell kan hålla huvudet kallt genom en kris för att bevara kundens varma attityd till deras varumärken." Thesis, Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-25780.
The purpose of this thesis is to develop a model for how businesses should work before, during and after a Crisis to maintain their brand. The study is based on a research where primary data has been collected through six interviews with experts within the area of crisis communication. An abductive method has been used since focus is shifting between empiri and theory, but where the focus mainly lies on the empirical study. Scientific articles have been collected for the theoretical framework and been gathered from databases such as google scholar and ABI/inform. The conclusion represents a tool as a model that will give companies guidelines in how to work before a crisis to detect, prevent and prepare the company. It also shows how companies should work during the crisis to minimize the effect and recover from it. The last part of the model shows how the company should work after the crisis to learn from it and prevent a similar crisis in the future.
Varma, Vidya Raghava [Verfasser], Matthias [Akademischer Betreuer] Prange, Michael [Akademischer Betreuer] Schulz, and Dierk [Akademischer Betreuer] Hebbeln. "Variability of the Southern Hemisphere Westerly Winds during the Holocene: Insights from coupled climate modelling / Vidya Raghava Varma. Gutachter: Michael Schulz ; Dierk Hebbeln. Betreuer: Matthias Prange." Bremen : Staats- und Universitätsbibliothek Bremen, 2011. http://d-nb.info/1071898469/34.
Karlsson, Fredrik, and Matilda Mårtensson. "Var kriget kallt när de kalmaritiska pressarna gick varma? : En presstudie om de kalmaritiska dagstidningarnas rapportering om händelser under det kalla kriget med Sovjetunionen i fokus." Thesis, Linnéuniversitetet, Institutionen för kulturvetenskaper (KV), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-81183.
Ribeiro, Patrick de Matos [Verfasser], Martin [Akademischer Betreuer] Wagner, and Walter [Gutachter] Krämer. "Pseudo maximum likelihood estimation of cointegrated multiple frequency I(1) VARMA processes using the state space framework / Patrick de Matos Ribeiro ; Gutachter: Walter Krämer ; Betreuer: Martin Wagner." Dortmund : Universitätsbibliothek Dortmund, 2020. http://d-nb.info/1229193693/34.
Höglund, Cecilia, Elina Tjäder, and Tilla Segerstedt. "Rött till blått – Grafisk kommunikation i marknadsföring för mobilspel : Undersökning av preferenser för varma och kalla färger med koppling till genus och personlighet för marknadsföring till mobilspel." Thesis, Högskolan i Skövde, Institutionen för informationsteknologi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-18515.
Fava, Renato Fadel. "Modelos univariados e multivariados para cálculo do Valor-em-Risco de um portifólio." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/45/45133/tde-27042010-143449/.
The present work consists of a comparative study of several portfolio Value-at-Risk models. Univariate models, which consider only the portfolio log-returns series, are compared to multivariate models, which consider the log-returns series of each asset individually and their conditional correlations. Additionally, recently proposed models such as PS-GARCH and VARMA-GARCH are tested. We also propose a new model that uses past cumulative returns as exogenous variables. All models are evaluated in terms of their compliance to Basel Accord and financial impact, in period that includes high volatility times. In general, univariate and multivariate models performed similarly. More complex models yielded more accurate results, with satisfactory performance including in crisis periods.
Jenny, Ripa. "En granskning av Narrative Exposure Theraphy : En litteraturstudie." Thesis, Luleå tekniska universitet, Institutionen för ekonomi, teknik och samhälle, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-59521.
Bengtsson, Malin, and Gosia Doweyko. "Fönsterglas : vilka, var och varför?" Thesis, Växjö University, School of Technology and Design, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:vxu:diva-892.
På dagens fönsterglasmarknad har produkter med samma funktioner och utseende fått olika namn. Detta är förvirrande och gör det svårt för en person som ska beställa fönsterglas att jämföra olika tillverkares produkter med varandra. Rapporten är tänkt som en översikt på de olika fönsterglasen som finns på marknaden idag och även på sådant som kan bli aktuellt i framtiden. Den berör också sådant som kan vara av värde att veta vid användning av fönsterglas. Målgruppen är alla som kan tänkas ha intresse i ämnet - alltifrån hobbybyggaren till fackmän i byggbranschen. Informationen är sammanställd från böcker, broschyrer, internet och experter på området fönsterglas.
Boubacar, Mainassara Yacouba. "Estimation, validation et identification des modèles ARMA faibles multivariés." Phd thesis, Université Charles de Gaulle - Lille III, 2009. http://tel.archives-ouvertes.fr/tel-00452032.
Stevanovic, Dalibor. "Factor models, VARMA processes and parameter instability with applications in macroeconomics." Thèse, 2011. http://hdl.handle.net/1866/5392.
As information technology improves, the availability of economic and finance time series grows in terms of both time and cross-section sizes. However, a large amount of information can lead to the curse of dimensionality problem when standard time series tools are used. Since most of these series are highly correlated, at least within some categories, their co-variability pattern and informational content can be approximated by a smaller number of (constructed) variables. A popular way to address this issue is the factor analysis. This framework has received a lot of attention since late 90's and is known today as the large dimensional approximate factor analysis. Given the availability of data and computational improvements, a number of empirical and theoretical questions arises. What are the effects and transmission of structural shocks in a data-rich environment? Does the information from a large number of economic indicators help in properly identifying the monetary policy shocks with respect to a number of empirical puzzles found using traditional small-scale models? Motivated by the recent financial turmoil, can we identify the financial market shocks and measure their effect on real economy? Can we improve the existing method and incorporate another reduction dimension approach such as the VARMA modeling? Does it help in forecasting macroeconomic aggregates and impulse response analysis? Finally, can we apply the same factor analysis reasoning to the time varying parameters? Is there only a small number of common sources of time instability in the coefficients of empirical macroeconomic models? This thesis concentrates on the structural factor analysis and VARMA modeling and answers these questions through five articles. The first two articles study the effects of monetary policy and credit shocks in a data-rich environment. The third article proposes a new framework that combines the factor analysis and VARMA modeling, while the fourth article applies this method to measure the effects of credit shocks in Canada. The contribution of the final chapter is to impose the factor structure on the time varying parameters in popular macroeconomic models, and show that there are few sources of this time instability. The first article analyzes the monetary transmission mechanism in Canada using a factor-augmented vector autoregression (FAVAR) model. For small open economies like Canada, uncovering the transmission mechanism of monetary policy using VARs has proven to be an especially challenging task. Such studies on Canadian data have often documented the presence of anomalies such as a price, exchange rate, delayed overshooting and uncovered interest rate parity puzzles. We estimate a FAVAR model using large sets of monthly and quarterly macroeconomic time series. We find that the information summarized by the factors is important to properly identify the monetary transmission mechanism and contributes to mitigate the puzzles mentioned above, suggesting that more information does help. Finally, the FAVAR framework allows us to check impulse responses for all series in the informational data set, and thus provides the most comprehensive picture to date of the effect of Canadian monetary policy. As the recent financial crisis and the ensuing global economic have illustrated, the financial sector plays an important role in generating and propagating shocks to the real economy. Financial variables thus contain information that can predict future economic conditions. In this paper we examine the dynamic effects and the propagation of credit shocks using a large data set of U.S. economic and financial indicators in a structural factor model. Identified credit shocks, interpreted as unexpected deteriorations of the credit market conditions, immediately increase credit spreads, decrease rates on Treasury securities and cause large and persistent downturns in the activity of many economic sectors. Such shocks are found to have important effects on real activity measures, aggregate prices, leading indicators and credit spreads. In contrast to other recent papers, our structural shock identification procedure does not require any timing restrictions between the financial and macroeconomic factors, and yields an interpretation of the estimated factors without relying on a constructed measure of credit market conditions from a large set of individual bond prices and financial series. In third article, we study the relationship between VARMA and factor representations of a vector stochastic process, and propose a new class of factor-augmented VARMA (FAVARMA) models. We start by observing that in general multivariate series and associated factors do not both follow a finite order VAR process. Indeed, we show that when the factors are obtained as linear combinations of observable series, their dynamic process is generally a VARMA and not a finite-order VAR as usually assumed in the literature. Second, we show that even if the factors follow a finite-order VAR process, this implies a VARMA representation for the observable series. As result, we propose the FAVARMA framework that combines two parsimonious methods to represent the dynamic interactions between a large number of time series: factor analysis and VARMA modeling. We apply our approach in two pseudo-out-of-sample forecasting exercises using large U.S. and Canadian monthly panels taken from Boivin, Giannoni and Stevanovic (2010, 2009) respectively. The results show that VARMA factors help in predicting several key macroeconomic aggregates relative to standard factor forecasting models. Finally, we estimate the effect of monetary policy using the data and the identification scheme as in Bernanke, Boivin and Eliasz (2005). We find that impulse responses from a parsimonious 6-factor FAVARMA(2,1) model give an accurate and comprehensive picture of the effect and the transmission of monetary policy in U.S.. To get similar responses from a standard FAVAR model, Akaike information criterion estimates the lag order of 14. Hence, only 84 coefficients governing the factors dynamics need to be estimated in the FAVARMA framework, compared to FAVAR model with 510 VAR parameters. In fourth article we are interested in identifying and measuring the effects of credit shocks in Canada in a data-rich environment. In order to incorporate information from a large number of economic and financial indicators, we use the structural factor-augmented VARMA model. In the theoretical framework of the financial accelerator, we approximate the external finance premium by credit spreads. On one hand, we find that an unanticipated increase in US external finance premium generates a significant and persistent economic slowdown in Canada; the Canadian external finance premium rises immediately while interest rates and credit measures decline. From the variance decomposition analysis, we observe that the credit shock has an important effect on several real activity measures, price indicators, leading indicators, and credit spreads. On the other hand, an unexpected increase in Canadian external finance premium shows no significant effect in Canada. Indeed, our results suggest that the effects of credit shocks in Canada are essentially caused by the unexpected changes in foreign credit market conditions. Finally, given the identification procedure, we find that our structural factors do have an economic interpretation. The behavior of economic agents and environment may vary over time (monetary policy strategy shifts, stochastic volatility) implying parameters' instability in reduced-form models. Standard time varying parameter (TVP) models usually assume independent stochastic processes for all TVPs. In the final article, I show that the number of underlying sources of parameters' time variation is likely to be small, and provide empirical evidence on factor structure among TVPs of popular macroeconomic models. To test for the presence of, and estimate low dimension sources of time variation in parameters, I apply the factor time varying parameter (Factor-TVP) model, proposed by Stevanovic (2010), to a standard monetary TVP-VAR model. I find that one factor explains most of the variability in VAR coefficients, while the stochastic volatility parameters vary in the idiosyncratic way. The common factor is highly and positively correlated to the unemployment rate. To incorporate the recent financial crisis, the same exercise is conducted with data updated to 2010Q3. The VAR parameters present an important change after 2007, and the procedure suggests two factors. When applied to a large-dimensional structural factor model, I find that four dynamic factors govern the time instability in almost 700 coefficients.
Zmeková, Barbora. "Portrét mystické básnířky Mahádéví Varmy." Master's thesis, 2014. http://www.nusl.cz/ntk/nusl-339996.
Jouini, Tarek. "Inférence exacte simulée et techniques d'estimation dans les modèles VAR et VARMA avec applications macroéconomiques." Thèse, 2008. http://hdl.handle.net/1866/2236.
Chen, Han-Yang, and 陳漢洋. "The Market-timing and Selectivity Performance of Mutual Fund- Time Series Application of Transfer Function and VARMA." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/41151014918092305222.
淡江大學
財務金融學系
86
Title of Thesis:The Market-timing and Selectivity Total Page :140 Performance of Mutual Fund-Time Series Application of Transfer Function and VARMA Keyword:Mutual Fund Performance, Transfer Function VARMA, Market timing Name of Institute:Graduate Institute of Money, Banking and Finance, Tamkang University Graduate date:June/1998 Degree conferred:Master Name of student:Han-Yang Chen Advisor:Dr. Gin-Chung Lin Dr. Yang-Cheng Lu 陳漢洋 林景春 博士 盧陽正 博士 Abstract: Traditionally, We used Ordinary Leasted Squared (OLS)to run Herriksson and Merton (1981) model or similar models ,such as , Treynor and Mazuy(1966), Fabozzi and Francis (1979),Chang and Lewellen (1984) etc., were up against residual autocorrellation. It would led to muuual fund performance evaluation incorrectly , so, we must use Transfer Function to improve traditional method. In addition, the study use holding- stock ratio of mutual fund to evaluate market- timing performance . Taking advantage of Causality (Granger;1969),if series X Granger cause series Y , I meant that series X leading series Y. This study made use of two serieses-mutual fund holding-stock ratio and market return to evaluate market-timing performance of mutual fund . If , mutual fund holding-stock ratio series leading market return , we firmly believed the mutual fund handing good market timing performance, conversely, it would not . The conclusions of the study listed below: 1. In Transfer Function, only Capital Small and Medium Cap Fund have significant selectivity in 13 closed mutual funds, and 8 mutual funds had, too , in 37 opened mutual funds . In market-timing performance , grand total 11 opened mutual funds significant. 2. In Causality test , only Grand Pacific Fund , have significant market-timing performance in 13 closed mutual funds , and 8 mutual funds had ,too, in 37 opened mutual funds. 3. In 50 stock mutual funds. Only 2 mutual funds have good market- timing and selectivity performance under Causality test and Transfer Function test.
Tai-Ching, Lee, and 李岱青. "Forecasting Ability Comparison in Time Series Models with Macroeconomic Variables in Taiwan--Application of Cointegrated VARMA Model." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/70206910161462314180.
林秋傑. "VARMA模型之結構辨識與懲罰迴歸的應用比較". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/54995865117486734911.
Tsai, Su-Fen, and 蔡素芬. "The Application of Forecasting Models on Hedging Strategies of Foreign Currency Futures - Comparision of ARIMA, VARMA & State Space Models." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/70622423124736413509.
銘傳管理學院
金融研究所
84
This article compared prediction performance of ARIMA model, VARMA model and s tate space model and hedging payoff between the modified selective hedging str ategy with forecasting models and two hedging strategies without forecasting m odel for the U.K. pound and German deutsche mark on spot exchange rates and fo reign currency futures price. Additionally, hedging is not costless. Based o n Vukina (1992), a modified Working (1962) selective hedging strategy is utili zed.All three models which are ARIMA model, VARMA model and state space model are initially estimated with the in-sample period, and forecasts are generated with the out-of-sample period. The prediction performance of three time seri es forecasting approaches were measured by MSE, MAE and MAPE statistics. The results indicate the forecast of state space model is best. And, the forecast of VARMA model is better than ARIMA model.Supposed the hedger who is short in the cash market faces three options: (1) to remain unhedging strategy; (2) fu ll hedging strategy; (3) hedge selectively using the modified selective hedgin g strategy with forecasting. The simulation result didn''t strong support the hedging payoff of the modified selective hedging strategy with forecasting mod els is better than two hedging strategies without forecasting model.Among the three models, the evidence showed the hedging payoff of state space model is b est, because the model exploits dynamic relationship of cash and futures price s, and uses the Kalman filter providing the forecast error to update the state space. The payoff of VARMA model is better than ARIMA model, because the VAR MA model also is the way to construct forecasts using dynamic relationship of cash and futures prices. In conclusion, the hedging strategy with superior fo recasting can effectively make hedgers increase profits or decrease losses fro m hedging.
Pelletier, Denis. "Problems in time series and financial econometrics : linear methods for VARMA modelling, multivariate volatility analysis, causality and value-at-risk." Thèse, 2004. http://hdl.handle.net/1866/178.
Huang, Shiang-Yu, and 黃祥郁. "The Study of the Volatility Relationship Between Stock Market and Foreign Exchange Market in Taiwan - The Applications of Bivariate Symmetric and Asymmetric VARMA GARCH Models." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/17041741850404429731.
國立中興大學
企業管理學系所
100
In many literatures, reaserchers focus on the causation between stock market and exchange market. Some studies find that stock market affects exchange market, some find that exchange market affects stock market, some find that no relationship between stock market and exchange market, it still don’t have a certain conclusion. Many studies use EGARCH model for the volatility relationship between stock market and exchange market and focus on countrys. This study uses the day data for the returns of stock market and foreign exchange market from 1999/01/05 to 2011/10/31, including Taiwan Stock Exchange Index, Taiwan Stock of Electronic Index, United States Dollar, Europe Dollar, Japanese Yen, Renminbi, Korean Won, and then takes Bivariate Symmetric and Asymmetric VARMA GARCH models to explore the symmetric and asymmetric volatility relationship between stock market and exchange market. Bivariate Symmetric and Asymmetric VARMA GARCH models don’t be applied to stock market and exchange market in Taiwan, this paper adds a research to this issue. The results show: (1) In Bivariate Symmetric and Asymmetric VARMA GARCH models, Taiwan Stock Exchange Index returns and exchange returns have the positive volatility with Europe Dollar and the negative volatility with Japanese Yen, United States Dollar, Renminbi, Korean Won; (2) In Bivariate Symmetric VARMA GARCH model, Taiwan Stock of Electronic Index returns and exchange returns have the negative volatility with United States Dollar, Europe Dollar, Japanese Yen, Renminbi, Korean Won. In Bivariate Asymmetric VARMA GARCH model, Taiwan Stock of Electronic Index returns and exchange returns have the positive volatility with Japanese Yen, Korean Won and the negative volatility with Renminbi, Europe Dollar, United States Dollar; (3) Taiwan Stock Exchange Index returns and exchange returns, Taiwan Stock of Electronic Index returns and exchange returns have bilateral asymmetric effects.
Tagne, Tatsinkou Joseph Francois. "Sur les tests lisses d'ajustement dans le context des series chronologiques." Thèse, 2015. http://hdl.handle.net/1866/13968.
Several phenomena from natural and social sciences rely on distribution’s assumption among which the normal distribution is the most popular. The validity of that assumption is useful to setting up forecast intervals or for checking model adequacy of the underlying model. The goodness-of-fit procedures are tools to assess the adequacy of the data’s underlying assumptions. Autoregressive and moving average time series models are often used to find the mathematical behavior of these phenomena from natural and social sciences, and especially in the finance area. These models are based on some assumptions including normality distribution for the innovations. Normality assumption may be helpful for some testing procedures. Furthermore, stronger conclusions can be drawn from the adjusted model if the white noise can be assumed Gaussian. In this work, goodness-of-fit tests for checking normality for the innovations from autoregressive moving average time series models are proposed for both univariate and multivariate cases (ARMA and VARMA models). In our first project, a smooth test of normality for ARMA time series models with unknown mean based on a least square type estimator is proposed. We derive the asymptotic null distribution of the test statistic. The result here is an extension of the paper of Ducharme et Lafaye de Micheaux (2004), where they supposed the mean known and equal to zero. We use the least square type estimator proposed by Brockwell et Davis (1991, section 10.8) and we provide a rigorous proof that it is almost surely convergent. We show that the covariance matrix of the test is nonsingular regardless if the mean is known. We have also studied a data driven approach for the choice of the dimension of the family and we gave a finite sample approximation of the null distribution. Finally, the finite and asymptotic sample properties of the proposed test statistic are studied via a small simulation study. In the second project, goodness-of-fit tests for checking multivariate normality for the innovations from vector autoregressive moving average time series models are proposed. Since these time series models may rely on a large number of parameters, structured parameterization of the functional form is allowed. The methodology also relies on the smooth test paradigm and on families of orthonormal functions with respect to the multivariate normal density. It is shown that the smooth tests converge to convenient chi-square distributions asymptotically. An important special case makes use of Hermite polynomials, and in that situation we demonstrate that the tests are invariant under linear transformations. We observed that the test is not invariant under linear transformations with Legendre polynomials. A consistent data driven method is discussed to choose the family order from the data. In a simulation study, exact levels are studied and the empirical powers of the smooth tests are compared to those of other methods. Finally, an application to real data is provided, specifically on Canadian labour market data and annual global temperature. These works were exposed at several meeting (see for example Tagne, Duchesne and Lafaye de Micheaux (2013a, 2013b, 2014) for more details). A paper based on the first project is submitted in a refereed journal (see Duchesne, Lafaye de Micheaux et Tagne (2016)).
Desrosiers, Gabriel. "Développements théoriques et empiriques des tests lisses d'ajustement des modèles ARMA vectoriels." Thesis, 2020. http://hdl.handle.net/1866/25475.
When validating time series models, the distribution of the observations represents a potentially important assumption. In this Master's Thesis, the advocated approach uses smooth goodness-of-fit test statistics. This research provides theoretical and empirical developments of the smooth goodness of fit tests for vector autoregressive moving average models (VARMA). In previous work, Ducharme and Lafaye de Micheaux (2004) developed smooth goodness-of-fit tests designed for the residuals of univariate ARMA models. Later, Tagne Tatsinkou (2016) generalized the work within the framework of vector ARMA (VARMA) models, which prove to be potentially useful in real applications. Structured parameterizations, which are considerations specific to the multivariate case, are discussed. The works of Tagne Tatsinkou (2016) are completed, according to theoretical angles, and additional simulation studies are also considered. The new smooth tests are based on families of orthogonal polynomials. In this study, special attention is given to Legendre's family and Hermite's family. The major theoretical contribution in this work is a complete proof that the test statistic is invariant to linear affine transformations when the Hermite family is adopted. The results of Tagne Tatsinkou (2016) represent an important first step, but they were incomplete with respect to the use of the model residuals. The proposed tests are based on a family of densities under alternative hypotheses of order k. A data driven method to choose the maximal order, based on the results of Ledwina (1994), is discussed. In our simulation studies, the automatic selection is also implemented. Our simulation studies include bivariate models and a trivariate model. In the level study, we can appreciate the good performance of the smooth tests. In the power study, several competitors were considered. We found that the smooth tests displayed interesting power properties when the data came from VARMA models with innovations in the class of contaminated normal distributions.
MING-HUI, Tien, та 田明暉. "以時間數列ARIMA與VARMA模式分析及預測台灣地區失業率與工業部門勞動生產力". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/24874987351554568029.
Χίος, Ιωάννης. "Identification of multivariate stochastic functional models with applications in damage detection of structures." Thesis, 2012. http://hdl.handle.net/10889/5562.
Η παρούσα διατριβή πραγματεύεται την αναγνώριση πολυμεταβλητών στοχαστικών συστημάτων που παρουσιάζουν πολλαπλές συνθήκες λειτουργίας, βασιζόμενοι σε δεδομένα που αντιστοιχούν σε ένα δείγμα ενδεικτικών συνθηκών λειτουργίας. Η σπουδαιότητα του προβλήματος είναι μεγάλη, καθώς στην πράξη συναντώνται πολύ συχνά συστήματα όπου οι επιμέρους συνθήκες λειτουργίας παραμένουν σταθερές ανά χρονικά διαστήματα. Τυπικά παραδείγματα περιλαμβάνουν μηχανολογικές, αεροναυτικές και δομικές κατασκευές που λειτουργούν κάτω από διαφορετικές συνθήκες (π.χ. θερμοκρασίας και/ή υγρασίας) σε διαφορετικές συνθήκες (π.χ. περίοδος της ημέρας). Οι διαφορετικές συνθήκες λειτουργίας ενδέχεται να επηρεάσουν ένα σύστημα και ως εκ τούτου τα δυναμικά χαρακτηριστικά του. Λαμβάνοντας υπόψη ένα σύνολο δεδομένων που αντιστοιχούν σε διαφορετικές συνθήκες λειτουργίας, είναι επιθυμητή η εύρεση ενός "γενικευμένου" μοντέλου ικανού να περιγράψει το σύστημα σε όλο το φάσμα των αποδεκτών συνθηκών λειτουργίας. Στην παρούσα διατριβή το πρόβλημα αυτό αντιμετωπίζεται μέσω ενός καινοτόμου πλαισίου αναγνώρισης στοχαστικών μοντέλων Συναρτησιακής Σώρευσης (stochastic Functional Pooling Framework), το οποίο εισάγει συναρτησιακές εξαρτήσεις (αναφορικά με την κατάσταση λειτουργίας) στην δομή του μοντέλου. Το συγκεκριμένο πλαίσιο Συναρτησιακής Σώρευσης προσφέρει σημαντικά πλεονεκτήματα σε σχέση με άλλες μεθόδους εύρεσης γενικευμένων μοντέλων που χρησιμοποιούν μεθόδους παρεμβολής (interpolation) σε ένα σύνολο συμβατικών μοντέλων (ένα για κάθε συνθήκη λειτουργίας), όπως: (i) Η ταυτόχρονη διαχείριση δεδομένων που αντιστοιχούν σε διαφορετικές συνθήκες λειτουργίας, καθώς και η διευθέτηση των αλληλοεξαρτήσεων μεταξύ δεδομένων που ανήκουν σε διαφορετικές συνθήκες λειτουργίας παρέχοντας με τον τρόπο αυτό μοντέλα με βέλτιστη στατιστική ακρίβεια, (ii) η χρήση συμπτυγμένων μοντέλων τα οποία περιγράφουν με ακρίβεια τα δυναμικά χαρακτηριστικά του συστήματος σε κάθε κατάσταση λειτουργίας, αποφεύγοντας έτσι την χρήση συμβατικών μεθόδων παρεμβολής, (iii) ο προσδιορισμός των αβεβαιοτήτων στη μοντελοποίηση κάθε κατάστασης λειτουργίας μέσω εκτίμησης κατάλληλων διαστημάτων εμπιστοσύνης. Μέχρι στιγμής, η έρευνα πάνω στο πλαίσιο Συναρτησιακής Σώρευσης έχει επικεντρωθεί στα βαθμωτά στοχαστικά μοντέλα. Η παρούσα διατριβή σαν στόχο έχει (i) την κατάλληλη διαμόρφωση και επέκταση του πλαισίου Συναρτησιακής Σώρευσης για την περίπτωση πολυμεταβλητών στοχαστικών συστημάτων που λειτουργούν με πολλαπλές συνθήκες λειτουργίας , και (ii) την εισαγωγή μιας καινοτόμου μεθοδολογίας ανίχνευσης βλαβών για συστήματα που παρουσιάζουν πολλαπλές συνθήκες λειτουργίας βασιζόμενη σε πολυμεταβλητά μοντέλα Συναρτησιακής Σώρευσης και στον στατιστικό έλεγχο υποθέσεων. Η περίπτωση των πολυμεταβλητών μοντέλων παρουσιάζει τεχνικές δυσκολίες που δεν συναντώνται στα βαθμωτά μοντέλα, καθώς η δομή των μοντέλων είναι πιο περίπλοκη ενώ η παραμετροποίησή τους είναι μη-τετριμμένη θέτοντας έτσι ζητήματα αναγνωρισιμότητας (model identifiability). Η παρούσα διατριβή εστιάζει σε Συναρτησιακά Σωρευμένα Διανυσματικά μοντέλα ΑυτοΠαλινδρόμησης με εΞωγενή είσοδο (Functionally Pooled Vector AutoRegressive with eXogenous excitation; FP-VARX), και σε Διανυσματικά μοντέλα ΑυτοΠαλινδρόμησης με Κινητό Μέσο Όρο (Functionally Pooled AutoRegressive with Moving Average; FP-VARMA). Τα μοντέλα αυτά μπορεί να θεωρηθούν ως γενικεύσεις των συμβατικών μοντέλων VARX/VARMA με την σημαντική διαφοροποίηση ότι οι παράμετροι του μοντέλου είναι συναρτήσεις της συνθήκης λειτουργίας. Το πρώτο κεφάλαιο της διατριβής επικεντρώνεται στην αναγνώριση μοντέλων FP-VARX. Αναπτύσσονται εκτιμήτριες βασισμένες στις μεθόδους των Ελαχίστων Τετραγώνων (Least Squares; LS) και της Μέγιστης Πιθανοφάνειας (Maximum Likelihood; ML), ενώ στη συνέχεια μελετώνται η συνέπεια (consistency) και η ασυμπτωτική κατανομή (asymptotic distribution)τους. Επιπλέον, καθορίζονται συνθήκες που εξασφαλίζουν την αναγνωρισιμότητα (identifiability) των FP-VARX μοντέλων, ενώ ο προσδιορισμός της δομής τους βασίζεται σε κατάλληλα τροποποιημένα κριτήρια πληροφορίας (information criteria). Η αποτίμηση της μοντελοποίησης με FP-VARX, καθώς επίσης και η αποτελεσματικότητά τους έναντι των συμβατικών μοντέλων VARX εξακριβώνεται μέσω προσομοιώσεων Monte Carlo. Στο δεύτερο κεφάλαιο διερευνάται η αναγνώριση των θερμοκρασιακών επιρροών στα δυναμικά χαρακτηριστικά μιας ευφυούς δοκού από σύνθετο υλικό. Το πρόβλημα μελετάται χρησιμοποιώντας συμβατικά μοντέλα καθώς και "γενικευμένα" μοντέλα. Η συμβατική μοντελοποίηση περιλαμβάνει μη-παραμετρικές παραστάσεις που βασίζονται στην μέθοδο Welch (ανάλυση στο πεδίο συχνοτήτων), καθώς και παραμετρικές παραστάσεις βασισμένες στα μοντέλα VARX (ανάλυση στο πεδίο χρόνου). H "γενικευμένη" μοντελοποίηση περιλαμβάνει παραστάσεις Σώρευσης με Σταθερές Παραμέτρους (Constant Coefficient Pooled VARX; CCP-VARX), καθώς και VARX παραστάσεις Συναρτησιακής Σώρευσης (Functionally Pooled VARX; FP-VARX). Η ανάλυση υποδεικνύει ότι τα χαρακτηριστικά των "γενικευμένων" και των συμβατικών μοντέλων βρίσκονται σε γενική συμφωνία μεταξύ τους. Ωστόσο, τα "γενικευμένα" μοντέλα περιγράφουν τα δυναμικά χαρακτηριστικά του συστήματος με μικρότερο αριθμό παραμέτρων, γεγονός που προσδίδει μεγαλύτερη ακρίβεια στην εκτίμησή τους. Το μοντέλο CCP-VARX τείνει να σταθμίσει τα δυναμικά χαρακτηριστικά του συστήματος σε κάποιον "μέσο όρο" με σχετική ακρίβεια. Απεναντίας το μοντέλο FP-VARX υπερέχει σε ακρίβεια, καθώς επιδεικνύει μια εξομαλυμένη καθοριστική εξάρτηση των δυναμικών χαρακτηριστικών του συστήματος με την θερμοκρασία, γεγονός που είναι συμβατό με την φυσική του προβλήματος. Το τρίτο κεφάλαιο επικεντρώνεται στην αναγνώριση μοντέλων FP-VARMA. Αναπτύσσονται εκτιμήτριες βασισμένες στις μεθόδους των Ελαχίστων Τετραγώνων Δύο Σταδίων (Two Stage Least Squares; 2SLS) και της Μέγιστης Πιθανοφάνειας (Maximum Likelihood; ML), ενώ στην συνέχεια μελετώνται η συνέπεια και η ασυμπτωτική κατανομή τους. Επιπλέον, εισάγεται μια νέα μέθοδος για την εκτίμηση 2SLS που απλοποιεί σημαντικά την διαδικασία εξαγωγής υπολοίπων (residuals) από το πρώτο στάδιο. Επίσης, καθορίζονται οι συνθήκες που εξασφαλίζουν αναγνωρισιμότητα στα μοντέλα FP-VARMA. Ο προσδιορισμός της δομής των μοντέλων FP-VARMA πραγματοποιείται χάρη σε μια μεθοδολογία δύο σταδίων που βασίζεται στην Ανάλυση Κανονικοποιημένων Συσχετίσεων (Canonical Correlation Analysis; CCA) και κριτηρίων πληροφορίας, αποφεύγοντας έτσι την εκτεταμένη χρήση αλγορίθμων αναζήτησης. Η αποτίμηση της μοντελοποίησης με FP-VARMA, καθώς επίσης και η αποτελεσματικότητά τους έναντι των συμβατικών VARMA εξακριβώνεται μέσω προσομοιώσεων Monte Carlo. Το τέταρτο κεφάλαιο πραγματεύεται την ανίχνευση βλαβών σε συστήματα που παρουσιάζουν πολλαπλές συνθήκες λειτουργίας. Προτείνεται μια νέα μεθοδολογία που βασίζεται σε καινοτόμα μοντέλα Συναρτησιακής Σώρευσης και στον στατιστικό έλεγχο υποθέσεων. Παρουσιάζονται δυο εκδόσεις της μεθοδολογίας: η πρώτη βασίζεται στα μορφικά χαρακτηριστικά του μοντέλου ενώ η δεύτερη στις παραμέτρους του μοντέλου. Επιπλέον, χρησιμοποιούνται μέθοδοι συμπίεσης της πληροφορίας που περιέχουν τα μορφικά χαρακτηριστικά ή οι παράμετροι του μοντέλου μέσω της Ανάλυσης Κύριων Συνιστωσών (Principal Component Analysis; PCA) σε μια προσπάθεια απλοποίησης της διαδικασίας ανίχνευσης βλαβών. Η αποτελεσματικότητα της μεθοδολογίας επαληθεύεται πειραματικά σε μια "ευφυή" δοκό από σύνθετο υλικό, η οποία ταλαντώνεται σε διαφορετικές θερμοκρασίες. Στην παρούσα μορφή της η μεθοδολογία χρησιμοποιεί δεδομένα απόκρισης ταλάντωσης, ωστόσο δεδομένα διέγερσης-απόκρισης μπορούν να χρησιμοποιηθούν εφόσον κριθεί σκόπιμο. Η εξάρτηση των δυναμικών χαρακτηριστικών της δοκού με την θερμοκρασία περιγράφεται με τη χρήση μοντέλων FP-VAR, ενώ εισάγεται μια νέα μέθοδος καθορισμού της δομής του μοντέλου που αποφεύγει την χρήση αλγορίθμων αναζήτησης. Πλήθος πειραμάτων που καλύπτουν ένα ευρύ θερμοκρασιακό πεδίο, καθώς και συγκρίσεις με άλλες μεθοδολογίες ανίχνευσης βλαβών, πιστοποιούν την ικανότητα της προτεινόμενης μεθοδολογίας να διαγνώσει την κατάσταση της δοκού σε διάφορες θερμοκρασίες. Το πέμπτο κεφάλαιο ασχολείται με ειδικά θέματα μοντελοποίησης των "γενικευμένων" VARX . Ιδιαίτερη προσοχή δίνεται στην μελέτη Σωρευμένων VARX (P-VARX) και CCP-VARX μοντέλων. Σε αντιστοιχία με τα μοντέλα FP, αναπτύσσονται εκτιμήτριες LS και ML, ενώ στην συνέχεια μελετώνται οι ιδιότητές τους. Επιπλέον, καθορίζονται οι συνθήκες που εξασφαλίζουν την αναγνωρισιμότητα των μοντέλων P-VARX και CCP-VARX. Μελετώνται επίσης και οι σχέσεις που συνδέουν τις δομές των μοντέλων P-VARX και CCP-VARX με τα FP-VARX ως προς την παραμετροποίησή τους και την ακρίβεια που επιτυγχάνουν. Επιπλέον, μελετάται και η σχέση των παραπάνω μοντέλων με τα συμβατικά VARX. Η αποτίμηση των γενικευμένων μοντέλων VARX αναφορικά με το πλήθος των εκτιμώμενων παραμέτρων και την ακρίβεια που επιτυγχάνουν εξακριβώνεται μέσω προσομοιώσεων Monte Carlo.
Feunou, Kamkui Bruno. "Affine and generalized affine models : Theory and applications." Thèse, 2009. http://hdl.handle.net/1866/3023.