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Dissertations / Theses on the topic 'Hansen method'

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Published: 4 June 2021

Last updated: 19 June 2025

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1

Zimmermann, Fabiano Penna. "Testando a superioridade preditiva do passeio aleatório em modelos de taxa de câmbio real efetiva." reponame:Repositório Institucional do FGV, 2016. http://hdl.handle.net/10438/15579.

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Submitted by FABIANO ZIMMERMANN (fabpenna@yahoo.com.br) on 2016-02-26T20:45:13Z No. of bitstreams: 1 Fabiano Zimmermann versao final.pdf: 445367 bytes, checksum: 653eae70f4eb404f167fdab5a327da7d (MD5)<br>Approved for entry into archive by Renata de Souza Nascimento (renata.souza@fgv.br) on 2016-02-26T20:47:44Z (GMT) No. of bitstreams: 1 Fabiano Zimmermann versao final.pdf: 445367 bytes, checksum: 653eae70f4eb404f167fdab5a327da7d (MD5)<br>Made available in DSpace on 2016-02-26T20:56:05Z (GMT). No. of bitstreams: 1 Fabiano Zimmermann versao final.pdf: 445367 bytes, checksum: 653eae70f4eb404f167fdab5a327da7d (MD5) Previous issue date: 2016-02-02<br>O estudo busca identificar quais variáveis são as mais relevantes para previsão da taxa de câmbio real efetiva e analisar a robustez dessas previsões. Foram realizados testes de cointegração de Johansen em 13 variáveis macroeconômicas. O banco de dados utilizado são séries trimestrais e os testes foram realizados sobre as séries combinadas dois a dois, três a três e quatro a quatro. Utilizando esse método, encontramos modelos que cointegravam entre si, para os países analisados. A partir desses modelos, foram feitas previsões fora da amostra a partir das últimas 60 observações. A qualidade das previsões foi avaliada por meio dos testes de Erro Quadrático Médio (EQM) e Modelo do Conjunto de Confiança de Hansen (MCS) utilizando um modelo de passeio aleatório do câmbio real como benchmark. Todos os testes mostram que, à medida que se aumenta o horizonte de projeção, o passeio aleatório perde poder preditivo e a maioria dos modelos são mais informativos sobre o futuro da taxa de câmbio real efetivo.<br>This paper seeks to identify which variables are the most relevant for predicting the real effective exchange rate and analyze the robustness of these forecasts. Johansen Cointegration tests were performed on 13 macroeconomic variables. The database quarterly series are used and tests were carried out on the combined sets two by two, three by three and four by four. Using this method, we find models that cointegrated each other, for the countries analyzed. From these models, predictions were made out of the sample from the last 60 observations. The quality of the forecasts was assessed by the mean square error tests (RMSE) and Model Hansen Confidence Set (MCS) used a random walk model the real exchange rate as a benchmark. All tests show that, as we expand the forecast horizon, the random walk lose predictive power and most models are more informative about the future of the real effective exchange rate in the long term.

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2

Saba, Nicole de Mendonça. "Avaliando o desempenho preditivo de modelos de taxa de câmbio real efetiva: análise do caso brasileiro." reponame:Repositório Institucional do FGV, 2015. http://hdl.handle.net/10438/14091.

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Submitted by Nicole de Mendonça Saba (nicolesaba@gmail.com) on 2015-09-24T17:21:52Z No. of bitstreams: 1 Nicole Saba versao final_vf.pdf: 1360650 bytes, checksum: aafa0056ed232ccdb36bda0393568740 (MD5)<br>Approved for entry into archive by Renata de Souza Nascimento (renata.souza@fgv.br) on 2015-09-24T17:28:57Z (GMT) No. of bitstreams: 1 Nicole Saba versao final_vf.pdf: 1360650 bytes, checksum: aafa0056ed232ccdb36bda0393568740 (MD5)<br>Made available in DSpace on 2015-09-24T17:33:40Z (GMT). No. of bitstreams: 1 Nicole Saba versao final_vf.pdf: 1360650 bytes, checksum: aafa0056ed232ccdb36bda0393568740 (MD5) Previous issue date: 2015-08-19<br>Este trabalho procura identificar quais variáveis são as mais relevantes para previsão da taxa de câmbio real do Brasil e analisar a robustez dessas previsões. Para isso foram realizados testes de cointegração de Johansen em 13 variáveis macroeconômicas. O banco de dados utilizado são séries trimestrais e compreende o período de 1970 a 2014 e os testes foram realizados sobre as séries combinadas dois a dois, três a três e quatro a quatro. Por meio desse método, encontramos nove grupos que cointegram entre si. Utilizando esses grupos, são feitas previsões fora da amostra com a partir das últimas 60 observações. A qualidade das previsões foi avaliada por meio dos testes de Erro Quadrático Médio, teste de Diebold-Mariano e, além disso, foi utilizado um modelo de passeio aleatório do câmbio real como benchmark para o procedimento de Hansen. Todos os testes mostram que, à medida que se aumenta o horizonte de projeção, o passeio aleatório perde poder preditivo e a maioria dos modelos são mais informativos sobre o futuro da o câmbio real efetivo. O horizonte é de três a quatro anos à frente. No caso do teste de Hansen, o passeio aleatório é completamente eliminado do grupo final de modelos, mostrando que é possível fazer previsões superiores ao passeio aleatório.<br>This paper seeks to identify which variables are most relevant to forecast Brazil's real exchange rate and also analyze the robustness of the results. To that end, we conducted Johansen cointegration tests on 13 different variables. The database covers the period of 1970 to 2014 with quarterly frequency. The series were combined in subsets of two, three and four variables. After conducting the Johansen cointegration test, we found that nine different groups that are cointegrated. We then proceed to estimate out-of-sample forecasts of the real exchange rate for each of these nine groups. Once we have these forecasts, we evaluate their quality by calculating their mean squared errors and conduct the Diebold-Mariano Test. We also use a random walk model of the exchange rate as benchmark for Hansen's model confidence set. All of the tests show that, as we expand the forecast horizon, the random walk series' predictive power is far worse than the other forecasts. In the case of Hansen's model confidence set, the random walk series is eliminated from the final confidence set of models. The time horizon is three to four years, which gives us evidence of forecast accuracy gains superior to the random walk model for the exchange rate in the long term.

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3

Lee, Jiho. "Impact of process parameter modification on poly(3-hexylthiophene) film morphology and charge transport." Thesis, Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50409.

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Organic electronics based on π-conjugated semi-conductor raises new technology, such as organic film transistors, e-paper, and organic photovoltaic cells that can be implemented cost-effectively on large-area applications. Currently, the device performance is limited by low charge carrier mobility. Poly(3-hexylthiophene) (P3HT) and organic field effect transistors (OFET) is used as a model to investigate morphology of the organic film and corresponding electronic properties. In this thesis, processing parameters such as boiling points and solubility are controlled to impact the micro- and macro-morphology of the film to enhance the charge transport of the device. Alternative approach to improve ordering of polymer chains and increase in charge transport without post-treatment of P3HT solution is studied. The addition of high boiling good solvent to the relatively low boiling main solvent forms ordered packing of π-conjugated polymers during the deposition process. We show that addition of 1% of dichlorobenzene (DCB) to the chloroform based P3HT solution was sufficient to improve wetting and molecular structures of the film to increase carrier mobility. Systematic study of solvent-assisted re-annealing technique, which has potential application in OFET encapsulation and fabrication of top-contact OFET, is conducted to improve mobility of OFET, and, to suggest a cost-effective processing condition suitable for industrial application. Three process parameters: boiling point, polarity, and solubility are investigated to further understand the trend of film response to the solvent-assisted technique. We report the high boiling non-polar solvents with relatively high RED values promote highest improvement in molecular packing and formulate crystalline structure of the thin film, which increases the device performance.

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4

Hansen, Sven [Verfasser]. "Weiterentwicklung einer Methode zur Bestimmung von Atmungsraten in geschüttelten Bioreaktoren / Sven Hansen." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2013. http://d-nb.info/1035621673/34.

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5

Hansen, Katja Verfasser], and Klaus-Robert [Akademischer Betreuer] [Müller. "Novel machine learning methods for computational chemistry / Katja Hansen. Betreuer: Klaus-Robert Müller." Berlin : Universitätsbibliothek der Technischen Universität Berlin, 2012. http://d-nb.info/1025538846/34.

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6

Santos, Pedro. "Approximation Methods for Convolution Operators on the Real Line." Doctoral thesis, Universitätsbibliothek Chemnitz, 2005. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200500362.

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This work is concerned with the applicability of several approximation methods (finite section method, Galerkin and collocation methods with maximum defect splines for uniform and non uniform meshes) to operators belonging to the closed subalgebra generated by operators of multiplication bz piecewise continuous functions and convolution operators also with piecewise continuous generating function.

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7

Amsih, Sama. "Metod att mäta vakansgraden inom handeln - En fältstudie." Thesis, KTH, Fastigheter och byggande, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-170747.

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8

Hansen, Andreas [Verfasser]. "Development of Efficient and Accurate Approximations to Single Reference Correlation Methods using Pair Natural Orbitals / Andreas Hansen." Bonn : Universitäts- und Landesbibliothek Bonn, 2012. http://d-nb.info/1044082259/34.

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9

Balasubramaniam, Vellakkinar. "FINITE ELEMENT ANALYSIS OF LEFT-HANDED WAVEGUIDES." Master's thesis, University of Central Florida, 2004. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3107.

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In this work, waveguides with simultaneous negative dielectric permittivity and magnetic permeability, otherwise known as left-handed waveguides, are investigated. An approach of formulating and solving an eigenvalue problem with finite element method resulting in the dispersion relation of the waveguides is adopted in the analysis. Detailed methodology of one-dimensional scalar and two-dimensional vector finite element formulation for the analysis of grounded slab and arbitrary shaped waveguides is presented. Based on the analysis, for waveguides with conventional media, excellent agreement of results is observed between the finite element approach and the traditional approach. The method is then applied to analyze left-handed waveguides and anomalous dispersion of modes is found. The discontinuity structure of a left-handed waveguide sandwiched between two conventional dielectric slab waveguides is analyzed using mode matching technique and the results are discussed based on the inherent nature of the materials. The scattering characteristics of a parallel plate waveguide partially filled with left-handed and conventional media are also analyzed using finite element method with eigenfunction expansion technique.<br>M.S.E.E.<br>Department of Electrical and Computer Engineering<br>Engineering and Computer Science<br>Electrical Engineering

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10

Hatscher, Benjamin [Verfasser], and Christian [Gutachter] Hansen. "Touchless, direct input methods for human-computer interaction to support image-guided interventions / Benjamin Hatscher ; Gutachter: Christian Hansen." Magdeburg : Universitätsbibliothek Otto-von-Guericke-Universität, 2020. http://d-nb.info/1222670720/34.

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11

Dantas, Luciano Dionisio [Verfasser]. "On Modifications to the Traffic-Responsive Urban Control Method / Luciano Dionisio Dantas." Aachen : Shaker, 2014. http://d-nb.info/1066197164/34.

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12

Chen, Xiaohong. "Theoretical and numerical studies of left-handed materials transmission properties, beam propagation and localization /." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B43278474.

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13

Kastelli, Tiina. "Att leda eleven vid handen : en studie om grundskollärares uppfattningar om handledning som metod och handledarrollen." Thesis, Mälardalen University, School of Education, Culture and Communication, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-9673.

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<p>Syftet med studien var att undersöka hur lärare på en grundskola som undervisar i teoretiska ämnen uppfattar sin roll som handledare för eleverna i verksamheten, men även hur lärarna arbetar med handledning av elever. Studien genomfördes med en kvalitativ ansats och den datainsamlingsmetod som användes var den halvstrukturerade intervjun och totalt intervjuades åtta lärare. De resultat som framkom i studien var att lärarnas definition av handledning bestod av två aspekter, dels den sociala delen och dels den pedagogiska. Lärarnas definition visade att de båda aspekterna är lika betydelsefulla och har lika stor plats i definitionen av handledning. Lärarnas upplevelser av handledning handlade om den didaktiska och pedagogiskt praktiska situationen och sociala aspekter. Samtalets utrymme i handledning ansågs bestå av motsättningar, när det gällde lärarnas ambition och den praktiska verkligheten. Lärarnas definition av handledarrollen handlade om att rollen ansågs bestå av många olika egenskaper. Lärarna upplevde att handledarrollen bestod av både sociala och pedagogiska kompetenser hos läraren. Dessutom var upplevelsen förbunden med en didaktisk aspekt som uttryckte svårigheterna i den didaktiska situationen. De slutsatser som studien kom fram till är att lärarna definierar handledning som en tvådimensionell metod. Lärarnas upplevelser av handledning uttryckte en bred uppfattning av begreppet, där samtalet hade sin nödvändiga, men svårplacerade ställning. Lärarna definierade handledarrollen som komplex och uttryckte en osäkerhet i omfattningen av den. Lärarnas upplevelser av sin handledarroll var att uppdraget sågs som komplicerat och näst intill ogenomförbart i grundskolan.</p>

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14

Bengtsson, Emma. "”Egentligen hade jag väl önskat att någon bara kom och tog mig i handen och sa ”det här är skitjobbigt, vi hjälper dig” - En intervjustudie om psykologers föreställningar om patientsuicid." Thesis, Linnéuniversitetet, Institutionen för psykologi (PSY), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-95700.

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Psykologer är en utav de yrkesgrupper som löper störst risk att under sin karriär mista en patient i suicid. Trots det saknas svenska studier på psykologer och deras arbete med suicidala patienter. Föreliggande studie syftade därför till att öka kunskap och förståelse för psykologers föreställningar om patientsuicid samt hur de upplever att det talas om det. Sju semistrukturerade intervjuer genomfördes med psykologer som inte hade egen erfarenhet av patientsuicid. Dessa analyserades utifrån en tematisk analys, vilken resulterade i fyra teman: Mellan förnuft och känsla, Två sidor av samma mynt, Ensam är inte stark och Individen bakom statistiken. Resultatet visade att enskilda psykologer och organisationer (universitet och arbetsplatser) hanterar och talar om suicidalitet på olika sätt. De olika aktörernas förhållningsätt bottnar antingen i förnuftet, i känslan eller i båda delar. Arbetet med suicidala patienter karakteriseras av oförutsägbarhet där kollegorna utgör ett viktigt stöd för psykologen i detta arbete. Därtill framkom att både den enskilda psykologen och samhället i stort har en vilja att humanisera den suicidala patienten. Slutligen verkar psykologers möte med suicidalitet vara ett underprioriterat ämne, vilket är framträdande både inom forskning, utbildning och på arbetsplatser.<br>Psychologists are one of the professions that are at a higher risk of losing a patient to suicide. Despite this, there is a lack of Swedish studies focusing on psychologists and their encounter with suicidal patients. Therefore, the present study aimed to increase knowledge and understanding for the notions that psychologists have regarding patient suicide and their opinions about how it is being talked about. Seven semi-structured interviews were conducted with psychologists who themselves had not lost a patient to suicide. The interviews were analysed through a thematic analysis which resulted in four themes: Between sense and sensibility, Two sides of the same coin, Alone is not strong and The individual behind the statistics. The findings showed that psychologists and the organizations (universities and workplaces) they were or had been a part of, were handling and talking about suicidality in different ways. The approach these different actors had to patient suicide was based on either sense, sensibility, or both. Working with suicidal patients is characterized by unpredictability thus highlighting that colleagues make up an important source of support. Furthermore, results showed that both individual psychologists and the society at large have a desire to humanize the suicidal patient. Finally, psychologists' encounter with suicidality seems to be an under-prioritized area, which is prominent in both research, education and in workplaces.

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15

Chen, Xiaohong, and 陳曉宏. "Theoretical and numerical studies of left-handed materials: transmission properties, beam propagationand localization." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B43278474.

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16

Schmidt, Florian [Verfasser], Marius [Akademischer Betreuer] Grundmann, Marius [Gutachter] Grundmann, Wenckstern Holger [Akademischer Betreuer] von, and Wolfgang [Gutachter] Hansen. "Raumladungszonenspektroskopische Methoden zur Charakterisierung von weitbandlückigen Halbleitern / Florian Schmidt ; Gutachter: Marius Grundmann, Wolfgang Hansen ; Marius Grundmann, Holger von Wenckstern." Leipzig : Universitätsbibliothek Leipzig, 2015. http://d-nb.info/1239422555/34.

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17

Dantas, Luciano Dionisio [Verfasser], and Bernhard [Akademischer Betreuer] Friedrich. "On Modifications to the Traffic-Responsive Urban Control Method / Luciano Dionisio Dantas ; Betreuer: Bernhard Friedrich." Braunschweig : Technische Universität Braunschweig, 2014. http://d-nb.info/1175820792/34.

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18

Vadjed, Samiei Mohammad H. "Interaction of a radio-handset and a human head at 1900 MHz using the FDTD method." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0027/NQ52264.pdf.

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19

Lu, Ling. "Characterisation and application of left-handed meta-materials using the dispersive finite-difference time-domain method." Thesis, Queen Mary, University of London, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.436108.

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20

Schäfer, Matthias Simon [Verfasser]. "Passenger Railway Crew Scheduling : Models, Methods, and Applications / Matthias Simon Schäfer." Aachen : Shaker, 2011. http://d-nb.info/1098041690/34.

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21

Manz, Hansjörg [Verfasser]. "Methode zur Sicherheitsnachweisführung einer bordautonomen satellitenbasierten Ortungseinheit für den Schienenverkehr / Hansjörg Manz." Aachen : Shaker, 2016. http://d-nb.info/1120864291/34.

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22

Swider, Derk Jan. "Handel an Regelenergie- und Spotmärkten Methoden zur Entscheidungsunterstützung für Netz- und Kraftwerksbetreiber /." Wiesbaden : Dt. Univ.-Verl, 2006. http://dx.doi.org/10.1007/978-3-8350-9215-0.

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23

Hendriks, Björn Alexander [Verfasser], and Sandor P. [Akademischer Betreuer] Fekete. "Improving Traffic Flow by Local Methods / Björn Alexander Hendriks ; Betreuer: Sandor P. Fekete." Braunschweig : Technische Universität Braunschweig, 2013. http://d-nb.info/1175822582/34.

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24

Wille, Jan H. [Verfasser]. "Eine Methode zur Schaffung von Produktinnovationen in der Technischen Logistik / Jan H Wille." Aachen : Shaker, 2007. http://d-nb.info/1166516776/34.

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25

Recktenwald, Andreas [Verfasser], and Ralph [Akademischer Betreuer] Friedmann. "Advanced methods for estimating the probability of informed trading / Andreas Recktenwald ; Betreuer: Ralph Friedmann." Saarbrücken : Saarländische Universitäts- und Landesbibliothek, 2019. http://d-nb.info/1212853377/34.

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26

Nadsady, Kenneth Allan. "A two-stage method for system identification from time series." Ohio : Ohio University, 1998. http://www.ohiolink.edu/etd/view.cgi?ohiou1176406389.

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27

Fleckenstein, Marco [Verfasser], Gerd [Akademischer Betreuer] Balzer, Jutta [Akademischer Betreuer] Hanson, and Albert [Akademischer Betreuer] Moser. "Risikoorientierte Instandhaltung auf der Basis der Value-at-Risk Methode im Übertragungsnetz / Marco Fleckenstein. Betreuer: Gerd Balzer ; Jutta Hanson ; Albert Moser." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2015. http://d-nb.info/1112044418/34.

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Fleckenstein, Marco Elmar [Verfasser], Gerd [Akademischer Betreuer] Balzer, Jutta [Akademischer Betreuer] Hanson, and Albert [Akademischer Betreuer] Moser. "Risikoorientierte Instandhaltung auf der Basis der Value-at-Risk Methode im Übertragungsnetz / Marco Fleckenstein. Betreuer: Gerd Balzer ; Jutta Hanson ; Albert Moser." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2015. http://nbn-resolving.de/urn:nbn:de:tuda-tuprints-50327.

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29

Müller-Botsch, Christine. ""Den richtigen Mann an die richtige Stelle" : Biographien und politisches Handeln von unteren NSDAP-Funktionären /." Frankfurt am Main : Campus Verlag, 2009. http://opac.nebis.ch/cgi-bin/showAbstract.pl?u20=9783593388939.

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30

DENICH, ELEONORA. "Numerical methods for electromagnetic inversion." Doctoral thesis, Università degli Studi di Trieste, 2023. https://hdl.handle.net/11368/3042164.

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The aim of electromagnetic (EM) sounding methods in geophysics is to obtain information about the subsurface of the earth by recorded measurements taken at the surface. In particular, the goal is to determine variations in the electrical conductivity of the earth with depth by employing an inversion procedure. In this work we focus on one technique, that consists of placing a magnetic dipole above the surface, composed of a transmitter coil and different couples of adjacent receiver coils. The receiver couples are placed at different distances (offsets) from the transmitter coil. In this setting, the electromagnetic induction effect, encoded in the first-order linear Maxwell’s differential equations, produce eddy alterning currents in the soil which induce response electromagnetic fields, that can be used to determine the conductivity profile of the ground by meaning of an inversion algorithm. A typical inversion strategy consists in an iterative procedure involving the computation of the EM response of a layered model (forward modelling) and the solution of the inverse problem. Then, the algorithm attempts to minimize the mismatch between the measured data and the predicted data, by updating the model parameters at each iteration. By assuming that the local subsurface structures are composed by horizontal and homogeneous layers, general integral solutions of Maxwell equations (i.e., the EM fields) for vertical and horizontal magnetic dipoles, can be derived and represented as Hankel transforms, which contain the subsurface model parameters, i.e., the conductivity and the thickness of each layer. By a mathematical point of view, in general, these Hankel transforms are not analytically computable and therefore it is necessary to employ a numerical scheme. Anyway, the slowly decay of the oscillations determined by the Bessel function makes the problem very difficult to handle, because traditional quadrature rules typically fail to converge. In this work we consider two different approaches. The first one is based on the decomposition of the integrand function in a first function for which the corresponding Hankel transform is known exactly, and an oscillating function decays exponentially. For realistic sets of parameters, the oscillations are quite rapidly damped, and the corresponding integral can be accurately computed by a classical quadrature rule on finite intervals. The second approach consists in the application of a Gaussian quadrature formula. We develop a Gaussian rule for weight functions involving fractional powers, exponentials and Bessel functions of the first kind. Moreover, we derive an analytical approximation of these integrals that has a general validity and allows to overcome the limits of common methods based on the modelling of apparent conductivity in the low induction number (LIN) approximation. Having at disposal a reliable method for evaluating the Hankel transforms, by assuming as forward model a homogeneous layered earth, here we also consider the inverse problem of computing the model parameters (i.e., conductivity and thickness of the layers) from a set of measured field values at different offsets. We focus on the specific case of the DUALEM system. We employ two optimization algorithms. The first one is based on the BFGS line-search method and, in order to reduce as much as possible the number of integral evaluations, the analytic approximation of these integrals is used to have a first estimate of the solution. For the second approach we employ the damped Gauss-Newton method. To avoid the dependence on the initial guess of the iterative procedure, we consider a set of different initial models, and we use each one to solve the optimization problem. The numerical experiments, carried out for the study of river-levees integrity, are obtained by employing a virtual machine equipped with the NVIDIA A100 Tensor Core GPU.<br>The aim of electromagnetic (EM) sounding methods in geophysics is to obtain information about the subsurface of the earth by recorded measurements taken at the surface. In particular, the goal is to determine variations in the electrical conductivity of the earth with depth by employing an inversion procedure. In this work we focus on one technique, that consists of placing a magnetic dipole above the surface, composed of a transmitter coil and different couples of adjacent receiver coils. The receiver couples are placed at different distances (offsets) from the transmitter coil. In this setting, the electromagnetic induction effect, encoded in the first-order linear Maxwell’s differential equations, produce eddy alterning currents in the soil which induce response electromagnetic fields, that can be used to determine the conductivity profile of the ground by meaning of an inversion algorithm. A typical inversion strategy consists in an iterative procedure involving the computation of the EM response of a layered model (forward modelling) and the solution of the inverse problem. Then, the algorithm attempts to minimize the mismatch between the measured data and the predicted data, by updating the model parameters at each iteration. By assuming that the local subsurface structures are composed by horizontal and homogeneous layers, general integral solutions of Maxwell equations (i.e., the EM fields) for vertical and horizontal magnetic dipoles, can be derived and represented as Hankel transforms, which contain the subsurface model parameters, i.e., the conductivity and the thickness of each layer. By a mathematical point of view, in general, these Hankel transforms are not analytically computable and therefore it is necessary to employ a numerical scheme. Anyway, the slowly decay of the oscillations determined by the Bessel function makes the problem very difficult to handle, because traditional quadrature rules typically fail to converge. In this work we consider two different approaches. The first one is based on the decomposition of the integrand function in a first function for which the corresponding Hankel transform is known exactly, and an oscillating function decays exponentially. For realistic sets of parameters, the oscillations are quite rapidly damped, and the corresponding integral can be accurately computed by a classical quadrature rule on finite intervals. The second approach consists in the application of a Gaussian quadrature formula. We develop a Gaussian rule for weight functions involving fractional powers, exponentials and Bessel functions of the first kind. Moreover, we derive an analytical approximation of these integrals that has a general validity and allows to overcome the limits of common methods based on the modelling of apparent conductivity in the low induction number (LIN) approximation. Having at disposal a reliable method for evaluating the Hankel transforms, by assuming as forward model a homogeneous layered earth, here we also consider the inverse problem of computing the model parameters (i.e., conductivity and thickness of the layers) from a set of measured field values at different offsets. We focus on the specific case of the DUALEM system. We employ two optimization algorithms. The first one is based on the BFGS line-search method and, in order to reduce as much as possible the number of integral evaluations, the analytic approximation of these integrals is used to have a first estimate of the solution. For the second approach we employ the damped Gauss-Newton method. To avoid the dependence on the initial guess of the iterative procedure, we consider a set of different initial models, and we use each one to solve the optimization problem. The numerical experiments, carried out for the study of river-levees integrity, are obtained by employing a virtual machine equipped with the NVIDIA A100 Tensor Core GPU.

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Nguyen, Thi Binh [Verfasser], Manfred [Akademischer Betreuer] Boltze, and Hanno [Akademischer Betreuer] Friedrich. "A Multi-Stage Impact Assessment Method for Freight Transport Management Measures – The Example of Vietnamese Rice Production and Logistics / Binh Nguyen Thi ; Manfred Boltze, Hanno Friedrich." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2017. http://d-nb.info/1137324023/34.

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Lackhove, Christoph [Verfasser], and Karsten [Akademischer Betreuer] Lemmer. "Methode zur Optimierung der Migration von ETCS / Christoph Lackhove ; Betreuer: Karsten Lemmer." Braunschweig : Technische Universität Braunschweig, 2013. http://d-nb.info/117582111X/34.

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Frey, Markus [Verfasser], Rainer [Akademischer Betreuer] Kolisch, and Christian [Akademischer Betreuer] Artigues. "Models and Methods for Optimizing Baggage Handling at Airports / Markus Frey. Betreuer: Rainer Kolisch. Gutachter: Rainer Kolisch ; Christian Artigues." München : Universitätsbibliothek der TU München, 2014. http://d-nb.info/1080299483/34.

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Pohl, Maximilian [Verfasser], Rainer [Akademischer Betreuer] Kolisch, Rainer [Gutachter] Kolisch, and Christian [Gutachter] Artigues. "Runway Scheduling During Winter Operations – Models, Methods, and Applications / Maximilian Pohl ; Gutachter: Rainer Kolisch, Christian Artigues ; Betreuer: Rainer Kolisch." München : Universitätsbibliothek der TU München, 2020. http://d-nb.info/1232406074/34.

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35

Braun, Anika [Verfasser], Rafig [Akademischer Betreuer] Azzam, Erwin [Akademischer Betreuer] Klumpp, and Christoph [Akademischer Betreuer] Neukum. "Method development for the characterization of transport processes of engineered nanoparticles in saturated soils with focus on silver nanoparticles / Anika Braun ; Rafig Azzam, Erwin Klumpp, Christoph Neukum." Aachen : Universitätsbibliothek der RWTH Aachen, 2015. http://d-nb.info/112926162X/34.

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Güsken, Sarah Ranjana [Verfasser], Frank T. [Akademischer Betreuer] Piller, and Sabina [Akademischer Betreuer] Jeschke. "A multi-method study of consumer behavior : towards a better understanding of the consumer's persperctive on online grocery shopping / Sarah Ranjana Güsken ; Frank Thomas Piller, Sabina Jeschke." Aachen : Universitätsbibliothek der RWTH Aachen, 2020. http://d-nb.info/1227992122/34.

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37

Voll, Robert [Verfasser]. "Methoden der mathematischen Optimierung zur Planung taktischer Wagenrouten im Einzelwagenverkehr / Robert Voll." München : Verlag Dr. Hut, 2014. http://d-nb.info/1058284878/34.

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38

Suthold, Roman [Verfasser]. "Eine Methode zur zielorientierten Maßnahmenidentifikation bei der Aufstellung von Bedarfsplänen im Verkehrssektor / Roman Suthold." Aachen : Shaker, 2008. http://d-nb.info/1164342746/34.

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Tegtmeyer, Dag [Verfasser]. "Entwicklung einer Methodik zur kennliniengestützten Planung von Transportketten in der Schüttgutlogistik / Dag Tegtmeyer." Aachen : Shaker, 2012. http://d-nb.info/1067736689/34.

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Kiermaier, Ferdinand [Verfasser], Rainer [Akademischer Betreuer] [Gutachter] Kolisch, and Jonathan F. [Gutachter] Bard. "Models and Methods for Optimizing Baggage and Ground Handling at Airports / Ferdinand Kiermaier ; Gutachter: Rainer Kolisch, Jonathan F. Bard ; Betreuer: Rainer Kolisch." München : Universitätsbibliothek der TU München, 2015. http://d-nb.info/1136422560/34.

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41

Schulz, Arne Hendrik Verfasser], Andreas [Akademischer Betreuer] [Breiter, and Ulrike [Akademischer Betreuer] Lucke. "Usability in digitalen Kooperationsnetzwerken. Nutzertests und Logfile-Analyse als kombinierte Methode / Arne Hendrik Schulz. Betreuer: Andreas Breiter. Gutachter: Andreas Breiter ; Ulrike Lucke." Bremen : Staats- und Universitätsbibliothek Bremen, 2016. http://d-nb.info/1084866242/34.

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Hinrichsen, Sven [Verfasser]. "Arbeitsrationalisierung mittels Methoden des Industrial Engineering in Dienstleistungsbetrieben / Sven Hinrichsen." Aachen : Shaker, 2007. http://d-nb.info/1164338994/34.

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43

Albinski, Szymon [Verfasser], Stefan [Akademischer Betreuer] Minner, Stefan [Gutachter] Minner, and Teodor Gabriel [Gutachter] Crainic. "Analytics for Shared Mobility and Transportation Systems : Advances in Methods and Insights / Szymon Albinski ; Gutachter: Stefan Minner, Teodor Gabriel Crainic ; Betreuer: Stefan Minner." München : Universitätsbibliothek der TU München, 2020. http://d-nb.info/1203300026/34.

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44

Steiger, Markus [Verfasser], and Kurt E. [Akademischer Betreuer] Klein. "Multiagentensysteme als integrative Methode zur Simulation von räumlichem Konsumentenverhalten: Untersuchung individuenbasierter Simulationsszenarien zur strategischen Standortplanung im Einzelhandel / Markus Steiger. Betreuer: Kurt E. Klein." Regensburg : Universitätsbibliothek Regensburg, 2016. http://d-nb.info/1096751569/34.

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45

Lindenthal, Sonja [Verfasser]. "Anwendung hyperheuristischer Methoden auf das Tourenplanungsproblem mit Zeitfensterrestriktionen innerhalb eines deterministisch-heuristischen Frameworks / Sonja Lindenthal." Hagen : Fernuniversität Hagen, 2013. http://d-nb.info/1037120981/34.

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Otterstätter, Thomas [Verfasser], and Markus [Akademischer Betreuer] Friedrich. "Methoden zur Erfassung von Verkehrsströmen und Fahrzeiten mit stationären fahrzeugwiedererkennenden Detektoren / Thomas Otterstätter. Betreuer: Markus Friedrich." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2014. http://d-nb.info/1046833642/34.

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Mangor, Kristian. "An application of the Helpman (1998) model to the Oresund-region." Thesis, Högskolan i Jönköping, Internationella Handelshögskolan, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-16064.

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Abstract:

This paper investigates the effect of the reduction of transport cost Oresundsbron has caused between the two subregions of the Oresund-region. The paper utilizes the the Helpman (1998) model and the procedure used by Hanson (2005) for estimating this equation. The paperbrings a clear inside into the method and thus provides an excellent start-ing position.

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Klemmer, Jeanette [Verfasser]. "Entwicklung einer Methodik zur funktionalen Gliederung von Netzen des Güterverkehrs und zur Bewertung der Angebotsqualität / Jeanette Klemmer." Aachen : Shaker, 2016. http://d-nb.info/1118258932/34.

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Metzner, Nora [Verfasser], Johannes [Akademischer Betreuer] Reichmuth, and Eike [Akademischer Betreuer] Stumpf. "Untersuchung der Resilienz von Flughafenterminalsystemen auf Basis analytischer und simulationsbasierter Methoden / Nora Metzner ; Johannes Reichmuth, Eike Stumpf." Aachen : Universitätsbibliothek der RWTH Aachen, 2020. http://d-nb.info/1216638489/34.

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Bomsdorf, Felix [Verfasser]. "Entscheidungsunterstützung für die Drehplanung bei Film- und Fernsehproduktionen : Modell - Methoden - System / Felix Bomsdorf." Aachen : Shaker, 2009. http://d-nb.info/1161311556/34.

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