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Gupta, Shailesh. "Mathematical Modeling of Thin Strip Casting Processes". The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu1391679731.
Pełny tekst źródłaRamírez, Marco Aurelio (Ramírez-Argáez) 1970. "Mathematical modeling of D.C. electric arc furnace operations". Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/8847.
Pełny tekst źródłaVita.
Includes bibliographical references (leaves 236-240).
A fundamental study of the Direct Current Electric Arc Furnace (DC-EAF) for steel-making has been carried out through the development of a rigorous mathematical model. The mathematical representation involves the simultaneous solution of Maxwell's equations for the electromagnetic fields, and the turbulent fluid flow and heat transfer equations. In solving the arc and bath regions it was assumed ( and justified) that the arc-bath interactions are dominated by the behavior of the arc. In contrast to previous modeling investigations, this work relaxes some critical assumptions and provides a more realistic and comprehensive representation of the system. This work also examines and compares the relative merits of alternative electromagnetic and turbulence formulations, and addresses the role of induced currents and compressibility effects in the representation of the arc. Furthermore, due allowance was made to represent and analyze the effect of gas injection, the presence of a slag layer in the bath and changes in anode configuration at the bottom of the reactor. Because of a lack of experimental information on actual or pilot plant DC-EAF systems, different aspects of the model were validated using several sources of experimental data reported in the literature for related systems. These included measurements on welding arcs, laboratory scale high-intensity carbon arcs, electromagnetically driven metallic systems, and ladle metallurgy physical models. It was found that, in general, the agreement between measurements and predictions was good. A detailed analysis was carried out to examine the effect of process parameters (e.g., arc current, arc length, bath dimensions, anode arrangements, etc) on the behavior of the furnace (e.g., heat transfer to the bath, heating efficiency, mixing times in the bath, etc). Predictions from the arc model show that all the arc characteristics are strongly coupled and that the arc physics is governed by the expansion of the arc. From a parametric study it was found that when the arc region (defined by the 10,000 K isotherm) is plotted in dimensionless form, a universal shape for the arc can be defined, regardless of the values of arc current or arc length. This universality was restricted to the range of conditions analyzed in this thesis, to arcs struck between graphite cathodes in air, and does not include the jet impingement region on the bath surface. This common arc expansion behavior suggested the universal nature of other arc characteristics. Universal maps of temperature, magnetic: flux density, and axial velocity are also reported in terms of simple analytical expressions. The practical effects of the two main process parameters of the arc region,. i.e. the arc current and the arc length, were analyzed. It was found that increasing the arc length significantly increases the arc resistance and, consequently, the arc power, although this behavior reached asymptotic values at larger arc lengths. Increasing the arc current, however, does not affect the arc voltage. Thus, it is found that increasing the arc power increases the amount of energy transferred into the bath, but the heat transfer efficiency decreases. Therefore, the shorter the arc the more efficient is the heat transfer to the bath. It is also recognized that heat transfer from the arc to the bath is controlled by convection, although radiation can become an important mechanism, especially for large arc lengths. Results of the bath model indicate that, in the absence of inert gas stirring and with no slag present in the system, electromagnetic body forces dominate and are responsible for the fluid flow patterns in the system. The effects of the arc determine the distributions of temperature and other mixing characteristics in the bath. The bath model was used to evaluate the effect of the main process parameters and design variables on mixing, refractory wear, temperature stratification, and heat transfer efficiency. An increase in the arc length is detrimental to mixing but increases the rate of heating in the melt as a result of the increased arc power. Increasing arc current improves mixing and the heat transferred to the bath, but is likely to be detrimental to the life of the bottom refractory. The results also suggest that high furnace aspect ratios (taller and thinner arc furnaces) are highly recommended because an increase in the aspect ratio increases mixing, prevents refractory wear, and promotes arc heating efficiency. The arc configuration in the furnace can be changed to control fluid flow patterns in the bath to meet specific needs, such as better mixing, or to prevent refractory wear. The presence of a top layer of slag reduces mixing and increases overall liquid temperatures. Injection of gases through the bottom in eccentric operations generates complex flow patterns that improve mixing in regions away from the symmetry axis. It is the author's belief that this model is a useful tool for process analysis in the DC-EAF. It has the capability to address many issues of current and future concern and represents one component of a fundamental approach to the optimization of DC-EAF operations.
by Marco Aurelio Ramírez.
Ph.D.
Weens, William. "Mathematical modeling of liver tumor". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2012. http://tel.archives-ouvertes.fr/tel-00779177.
Pełny tekst źródłaBadekas, Paris. "Mathematical modeling of en route ATC intervention rates". Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/14746.
Pełny tekst źródłaDeering, Scott E. (Scott Earl) 1967. "Mathematical and physical modeling of flip-chip soldering processes". Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/11115.
Pełny tekst źródłaSaxena, Amit. "Mathematical modeling of horizontal twin roll thin strip casting process". The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu1392309532.
Pełny tekst źródłaGroshong, Kimberly A. "Defining mathematical modeling for K-12 education". The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1534374871189434.
Pełny tekst źródłaMuthukumaran, Arun. "Foam-mat freeze drying of egg white and mathematical modeling". Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=18301.
Pełny tekst źródłaLes œufs sont une bonne source de protéines de haute qualité, puisqu’ils contiennent tous les acides aminés nécessaires au corps humain. Les œufs contiennent aussi toutes les vitamines (à l’exception de la vitamine C), ainsi que plusieurs minéraux essentiels. Les œufs sont principalement constitués de l’albumine (blanc d’œuf) ainsi que le jaune d’œuf. L’albumine est principalement consituée de protéines et a d’excellentes propriétés de moussage. Elle est utilisée à grande échelle dans les industries boulangère et de la confiserie, par exemple dans les mélanges à gâteaux et de la meringue. On utilise beaucoup la déshydratation pour préserver les oeufs. Réfrigérés, les produits d’œuf déshydraté se conservent pendant un an. Le séchage par atomisation et le séchange par conduction sont couramment utilisés pour produire de la poudre d’œuf. Par contre, les températures élevées associées à ces méthodes de séchage pourraient compromettre la valeur nutritive des œufs. La cryodessication donne un produit déshydraté de très haute qualité, mais les coûts d’opération élevés limitent son utilisation qu’aux produits de haute valeur, tel le café. Le séchage par émulsion peut être utilisé lorsque les produits à sécher peuvent mousser, ce qui accroît la surface de contact et augmente le coefficient d'échange thermique. Cependant, les températures élevées associées à cette méthode ne conviennent pas à la production d’un produit déshydraté de haute qualité. La cryodessication par émulsion est une méthode de séchage prometteuse, puisqu’elle tire des avantages liés à la cryodessication et au séchage par émulsion pour produire de la poudre d’albumine de meilleure qualité. Des essais en laboratoire ont démontré que la stabilité des mousses de blanc d’œuf ne convient pas au séchage par émulsion. Des expériences ont donc été entreprises dans le but de trouver un stabiliseu
Kriek, Andre. "RoboCup formation modeling". Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/2810.
Pełny tekst źródłaSince the late 1990s, the Robot Soccer World Cup has been used as a testing ground for new technology in the eld of robotic design and arti cial intelligence. This research initiative pits two teams of robots against each other in a game of soccer. It is hoped that the technology gained will enable the construction of a fully autonomous team of robot players to play a normal soccer game against a human team by the year 2050. In robot soccer matches, as in real soccer matches, inferring an opponent's strategy can give a team a major advantage. One important aspect of a team's strategy is the formation the team uses. Knowing the formations that an opposing team tends to take, enables a team to prepare appropriate countermeasures. This thesis will investigate methods to extract formation information from a completed soccer game. The results show that these methods can be used to infer a classical team formation, as well as other distinguishing characteristics of the players, such as which areas on the eld the players tend to occupy, or the players' movement patterns - both valuable items of information for a future opposition team.
Yau, Shuk-Han Ada. "Numerical analysis of finite difference schemes in automatically generated mathematical modeling software". Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/35407.
Pełny tekst źródłaIncludes bibliographical references (leaves 64-65).
by Shuk-Han Ada Yau.
M.S.
Alagoz, Duriye Ece. "Mathematical Modeling Of Fluidized Bed Combustors With Radiation Model". Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607489/index.pdf.
Pełny tekst źródłaAlghamdi, Faisal. "Mathematical modeling of mean flow stress (MFS) during hot strip rolling for HSLA steels". Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=123280.
Pełny tekst źródłaA l'aide des résultats d'expériences qui utilisent la torsion à chaud, l'effet causé par «l'écart chronologique » est analysé (ex. le délai entre l'ébauchage et le finissage du schéma de laminage à chaud et le comportement de la contrainte d'écoulement moyenne des aciers à haute résistance mécanique). Deux types de déformation à chaud ont été étudiés : un schéma moyen au temps d'interpasse constante, dans lequel chaque passe est identique, dont la température diminue à un rythme régulier au cours du programme de laminage. Dans ce type de schéma, un intervalle de 5 et de 30 secondes sont utilisés afin d'étudier l'influence du durcissement structural sur le comportement de la contrainte d'écoulement moyenne. Aux 5 secondes d'interpasse, où le dragage est le mécanisme responsable qui empêche la recristallisation, une nouvelle méthode est proposée pour déterminer la température à laquelle la recristallisation n'est plus complète (Tnr). Pour ce qui est du 30 secondes d'interpasse, l'expérience s'inspire du schéma aux 5 secondes d'interpasse, en y ajoutant des intervalles de 10, 20 et 45 secondes à deux niveaux de température (ex. Au-dessus et en dessous de la température à laquelle la recristallisation n'est plus complète (Tnr). Selon les résultats d'analyse de la contrainte d'écoulement moyenne dans les diagrammes de 1000/T, des phénomènes tels que la recristallisation posttectonique et/ou le durcissement structural ont eu lieu durant ce temps d'attente. Un modèle mathématique servant à prédire la contrainte d'écoulement moyenne est développé et validé avec les données des expériences qui utilisent la torsion à chaud. L'évolution de la taille de grain, la fraction massive de précipité et l'effet d'adoucissement sur la déformation accumulée peuvent tous être calculés par le modèle. Ce dernier est capable de mesurer la déformation critique au cours d'une passe et ainsi, déduire l'adoucissement associé à la recristallisation syntectonique. En général, au niveau de la contrainte d'écoulement moyenne, l'hypothèse et le résultat d'expérience du schéma de déformation se rejoignent en grande partie. Toutefois, quelques divergences sur celle-ci sont observées durant les premières passes du finissage surtout lorsqu'un durcissement structural est plus susceptible à se produire. Finalement, plusieurs points sont suggérés dans le but de combler ces lacunes dans les expériences à venir.
Ivosevic, Milan Cairncross Richard A. Knight Richard. "Splat formation during thermal spraying of polymer particles : mathematical modeling and experimental analysis /". Philadelphia, Pa. : Drexel University, 2006. http://hdl.handle.net/1860/1121.
Pełny tekst źródłaWang, Shihu. "Computer Simulation and Mathematical Modeling of Reversibly Associated Polymers". Case Western Reserve University School of Graduate Studies / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=case1275488088.
Pełny tekst źródłaSchliemann, Bernd F. "Analysis and modeling of the initiative tenet of current army operations doctrine". Thesis, Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/25091.
Pełny tekst źródłaHwang, Dae Kun 1972. "Mathematical modeling of heterocyclic amines formation in meat patties during pan frying". Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33778.
Pełny tekst źródłaThe yield of HAs along with the influence of fat content and soy protein on the formation of HAs were determined during heating (as in cooking) at different temperatures using the kinetic modeling approach. The formation of HAs is dependent on temperature, time, fat content, and soy protein. The increase of fat content in samples resulted in a lower concentration of HAs' concentrations and a lower activation energy of reaction. Fat apparently enhanced the formation of HAs in meats but diluted availability of precursors for reactions. An increase in soy protein concentration decreased the maximum concentration of HAs formed in the different cooking conditions.
Two different approaches were used in order to model the formation of HAs. First, an artificial neural network (ANN) was used with two data sets to train and test the ANN. An ANN consisting of 18 processing elements and two hidden layers showed the best performance for predicting the formation of HAs. Second, the formation of HAs were predicted using temperature profiles in a cooked sample during pan-frying. The temperature profiles in cooked meat patty were predicted using finite element method. The concentration of HAs depended on the meat patty's surface temperature developed during pan frying. The result of this study can be used to develop methods to reduce HAs in food thus optimize product quality and safety.
Lebo, Matthew Jonathan. "Fractional Integration and Political Modeling". Thesis, University of North Texas, 1999. https://digital.library.unt.edu/ark:/67531/metadc2229/.
Pełny tekst źródłaChepete, Poloko. "Modeling of the factors affecting mathematical achievement of Form 1 students in Botswana based on the 2003 Trends in International Mathematics and Science Study". [Bloomington, Ind.] : Indiana University, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3319920.
Pełny tekst źródłaTitle from PDF t.p. (viewed on May 13, 2009). Source: Dissertation Abstracts International, Volume: 69-08, Section: A, page: 3074. Adviser: Frank K. Lester.
Deshpande, Rutooj D. "UNDERSTANDING AND IMPROVING LITHIUM ION BATTERIES THROUGH MATHEMATICAL MODELING AND EXPERIMENTS". UKnowledge, 2011. http://uknowledge.uky.edu/cme_etds/4.
Pełny tekst źródłaAcuña-Agost, Rodrigo. "Mathematical modeling and methods for rescheduling trains under disrupted operations". Phd thesis, Université d'Avignon, 2009. http://tel.archives-ouvertes.fr/tel-00453640.
Pełny tekst źródłaDavary, Kamran. "Soil moisture redistribution modeling with artificial neural networks". Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=36905.
Pełny tekst źródłaAn initial review of existing soil hydrology models provided greater insight into current modelling challenges and a general classification of the models. The application of AI techniques as alternative tools for soil hydrology modelling was explored.
A one-dimensional (1D) model based on ANN and FIS was developed. To estimate fluxes more accurately, multiple ANNs were trained and combined by way of an FIS. The main body of the model employed the ANN-FIS module to model soil moisture redistribution throughout the profile. When tested against the SWAP93 model, the ANN-FIS model gave a good match and maximum error of <8%; however, it did not show a notable computation cost shift.
The investigation proceeded with development of another ANN-based 1D modelling approach. This time, the soil profile or flow region, regardless of its depth, was divided into ten equal parts (compartments). The ANN was trained to estimate moisture patterns for a whole soil profile, from the previous day's soil moisture pattern and boundary conditions, and the current day's boundary conditions. The model was tested against SWAP93 where an average SCORE of 90.4 indicated a good match. The computation cost of the ANN-based model was about one-third that of SWAP93.
At this point the study sought to develop a 3D modelling approach. The ANN was trained to estimate the nodal soil moisture changes through time under the influence of six neighbouring nodes (in a 3D space, two on each axis). The model's accuracy was tested against the SWMS-3D model. An average SCORE of 91 and a 15-fold decrease in computation costs showed a quite acceptable performance. Results suggest that this approach is potentially capable of realistically modelling 3D VSSM redistribution with less computation time.
Finally, pros and cons of these ANN-based modelling approaches are compared and contrasted, and some recommendations on future work are given.
George, Gary R. "New methods of mathematical modeling of human behavior in the manual tracking task". Diss., Online access via UMI:, 2008.
Znajdź pełny tekst źródłaIncludes bibliographical references.
Horn, Jonathan Douglas. "EcoLE-FisH-YP: Mathematical modeling of Lake Erie yellow perch recruitment and population dynamics". The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1282003300.
Pełny tekst źródłaTorgerson, Scott Robert. "Mathematically modeling the effects of low-level learning in combat simulations and war games". Thesis, Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/25097.
Pełny tekst źródłaYee, Sean P. "Students' Metaphors for Mathematical Problem Solving". Kent State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=kent1340197978.
Pełny tekst źródłaRobison, Pamula J. "Mathematical Modelling of Biofilm Growth and Decay Through Various Deliveries of Antimicrobial". University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1258769688.
Pełny tekst źródłaCrosby, Jacy Rebecca. "Modeling and Synergy Testing of Drug Combination Data: A Pharmacokinetic Analysis". UNF Digital Commons, 2008. http://digitalcommons.unf.edu/etd/143.
Pełny tekst źródłaSaldamli, Levon. "PDEModelica : a high-level language for modeling with partial differential equations /". Doctoral thesis, Linköping : Department of Computer and Information Science, Linköping University, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-7281.
Pełny tekst źródłaGovorun, Maria. "Pension and health insurance, phase-type modeling". Doctoral thesis, Universite Libre de Bruxelles, 2013. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209447.
Pełny tekst źródłaLa thèse est focalisée sur différentes applications des modèles de type phase en assurance et montre leurs avantages. En particulier, le modèle de Lin et Liu en 2007 est intéressant, parce qu’il décrit le processus de vieillissement de l’organisme humain. La durée de vie d’un individu suit une loi de type phase et les états de ce modèle représentent des états de santé. Le fait que le modèle prévoit la connexion entre les états de santé et l’âge de l’individu le rend très utile en assurance.
Les résultats principaux de la thèse sont des nouveaux modèles et méthodes en assurance pension et en assurance santé qui utilisent l’hypothèse de la loi de type phase pour décrire la durée de vie d’un individu.
En assurance pension le but d’estimer la profitabilité d’un fonds de pension. Pour cette raison, on construit un modèle « profit-test » qui demande la modélisation de plusieurs caractéristiques. On décrit l’évolution des participants du fonds en adaptant le modèle du vieillissement aux causes multiples de sortie. L’estimation des profits futurs exige qu’on détermine les valeurs des cotisations pour chaque état de santé, ainsi que l’ancienneté et l’état de santé initial pour chaque participant. Cela nous permet d’obtenir la distribution de profits futurs et de développer des méthodes pour estimer les risques de longevité et de changements de marché. De plus, on suppose que la diminution des taux de mortalité pour les pensionnés influence les profits futurs plus que pour les participants actifs. C’est pourquoi, pour évaluer l’impact de changement de santé sur la profitabilité, on modélise séparément les profits venant des pensionnés.
En assurance santé, on utilise le modèle de type phase pour calculer la distribution de la valeur actualisée des coûts futurs de santé. On développe des algorithmes récursifs qui permettent d’évaluer la distribution au cours d’une période courte, en utilisant des modèles fluides en temps continu, et pendant toute la durée de vie de l’individu, en construisant des modèles en temps discret. Les trois modèles en temps discret correspondent à des hypothèses différentes qu’on fait pour les coûts: dans le premier modèle on suppose que les coûts de santé sont indépendants et identiquement distribués et ne dépendent pas du vieillissement de l’individu; dans les deux autres modèles on suppose que les coûts dépendent de son état de santé.
Doctorat en Sciences
info:eu-repo/semantics/nonPublished
Rao, Rashmi Jayathirtha. "Modeling learning behaviour and cognitive bias from web logs". The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1492560600002105.
Pełny tekst źródłaBuckman, Kevin D. "A Mathematical Model of Biofilm Growth and Decay with Applications of Antimicrobial". University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1333910050.
Pełny tekst źródłaSURANA, RAJESH R. "HIGH STRAIN FUNCTIONALLY GRADED BARIUM TITANATE AND ITS MATHEMATICAL CHARACTERIZATION". University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1096650232.
Pełny tekst źródłaErson, E. Zeynep. "Development, Integration and Simulation of Multiscale Mathematical Models of Physiological Processes: A Software Engineering Perspective". Case Western Reserve University School of Graduate Studies / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=case1289789036.
Pełny tekst źródłaFaborode, Jumoke O. "Predictive modeling of sulfide removal in tray aerators". Master's thesis, University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4633.
Pełny tekst źródłaID: 029050889; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Thesis (M.S.)--University of Central Florida, 2010.; Includes bibliographical references (p. 83-87).
M.S.
Masters
Department of Civil, Environmental, and Construction Engineering
Engineering and Computer Science
Simoni, Giulia. "Modeling Startegies for Computational Systems Biology". Doctoral thesis, Università degli studi di Trento, 2020. http://hdl.handle.net/11572/254361.
Pełny tekst źródłaSimoni, Giulia. "Modeling Startegies for Computational Systems Biology". Doctoral thesis, Università degli studi di Trento, 2020. http://hdl.handle.net/11572/254361.
Pełny tekst źródłaEly, David P. "Preparing Teachers to Integrate Computer Programming Into Mathematical Problem Solving". The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1478266333504353.
Pełny tekst źródłaAltinoklar, Hatice. "A Mathematical Modeling Study On The Feasibility Of Disposing Partially Treated Domestic Wastewater Using Soil Pile Systems". Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607944/index.pdf.
Pełny tekst źródłaKhodaverdi, Afaghi Mahtab. "Application of artificial neural network modeling in thermal process calculations of canned foods". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0033/MQ64381.pdf.
Pełny tekst źródłaXi, Jiahe. "Cardiac mechanical model personalisation and its clinical applications". Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:0db4cf52-4f64-4ee0-8933-3fb49d64aee6.
Pełny tekst źródłaKamonpatana, Pitiya. "MATHEMATICAL MODELING AND MICROBIOLOGICAL VERIFICATION OF OHMIC HEATING OF SOLID-LIQUID MIXURES IN CONTINUOUS FLOW OHMIC HEATER SYSTEMS". The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1343490087.
Pełny tekst źródłaCarman, Benjamin Andrew. "Repairing Redistricting: Using an Integer Linear Programming Model to Optimize Fairness in Congressional Districts". Ohio University Honors Tutorial College / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ouhonors1619177994406176.
Pełny tekst źródłaMeesumrarn, Thiraphat. "Simulation of Dengue Outbreak in Thailand". Thesis, University of North Texas, 2018. https://digital.library.unt.edu/ark:/67531/metadc1248484/.
Pełny tekst źródłaWise, Andre. "A spatial approach to edge effect modelling for plantation forestry". Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/85876.
Pełny tekst źródłaENGLISH ABSTRACT: One of the major objectives in plantation forestry is to achieve a high level of homogeneity of distribution and dimension of trees within the stand. Precise planting geometries, intensive silviculture and genetic selection are used to achieve this homogeneity. However, a natural variability is still introduced by micro-‐site conditions and disturbances. A substantial source of variation is caused by edge effects of neighbouring stands or other land use forms. The edge effect causes trees at the stand edge to develop differently from trees in the interior of the stand. The overarching objective of this study is to simulate the edge effect based on average stand interior variables as typically received from an enumeration and spatial information on the current and historic stand neighbourhood. With re-‐introducing this natural variance as well as its spatial pattern, we expect to derive improved planning information. A major aim is thus separating the effect of the edge interaction from the other factors contributing to stand variance and quantifying the result in terms of stand output. A methodology is introduced for quantifying interaction at stand edges between a given stand and its neighbouring stands over its lifetime. Transferring the edge interaction value from the edges to all the trees within the stand is then done by applying inverse distance weighting interpolation from the edges to the tree position within the stand. Once an edge interaction value has been calculated for each point, the extent of the edge effect is quantified. The spatial extent of the edge effect is derived empirically from an existing fully spatially mapped stand by means of breakpoint regression. The expected variance as a result of edge influence is then quantified by producing a set of models, which can reproduce the effect of the edge interaction on tree height, diameter and volume. The edge effect is treated as a dynamic interaction for which the temporal aspect needs to be considered, because the current spatial structure of a stand is influenced by its current neighbourhood, but also by the historic development of the neighbourhood in relation to the stand in question. Each stand therefore undergoes an edge effect which is completely unique to that stand, within a given time period. For this reason the presented methodology is a spatial-‐temporal one, aimed at providing a way in which growth and yield forest modelling can be augmented by the inclusion of the edge effect in a practical way. To explicitly quantify edge effects, the natural variance had to be separated into a component explained by edge effect and a second component introduced by other factors such as micro site conditions and disturbance. The second component is treated as an unexplained residual variance. In order to provide a realistic simulation of a stand output at a finer, tree level, this second stand variance needs nonetheless to be quantified. The variance attributable to factors other than the edge effect is mimicked by generating a random number by means of a parameterised stochastic process based on the variance of the inner stand region, which is beyond the reach of the edge effect. In this way, a realistic spatial pattern of a plantation forest stand, taking into account the edge effect and combining it with the natural stand variance is achieved. This study, within the field of plantation forest management, aspires to land use optimization both in terms of productive capacity estimation and for the provision of information for effective land use management planning. It makes use of open source software resources namely the R framework and QGIS and explores aerial stereophotogrammetry as an option for data collection.
AFRIKAANSE OPSOMMING: Een van die hoofdoelwitte in plantasie bosbou praktyk is hoё vlakke van homogeniteit met betrekking tot die verspreiding en die dimensies van die bome in die plantasie opstand. Simetriese aanplantings, intensiewe bosboupraktyk en genetiese seleksie word gebruik om hierdie homogeniteit te verkry. Natuurlike verskille word egter nog steeds gevind as gevolg van groeiplek mikro toestande en ander versteurings in die opstand. Een van die hoofbronne van hierdie variasie is die randeffekte van buurplantasies en ander gebruike van grond. Hierdie randeffekte veroorsaak dat bome aan die rand van die opstand anders ontwikkel as die bome binne in die opstand. Die oorhoofse doelwit met hierdie navorsing is om die randeffekte te simuleer. Hierdie randeffekte is gegrond op die gemiddelde binneopstand boom veranderlikes soos afgelei uit die opmeting en uit ruimtelike inligting oor die huidige en geskiedkundige toestande in die omgewing. As hierdie natuurlike variasies asook die ruimtelike patrone weer in berekening gebring word, verwag ons om beter beplanningsinligting te bekom. ’n Belangrike doelwit tydens hierdie navorsing is dus om die effek van die rand-‐interaksie te skei van die effek van ander faktore wat bydra tot variasies binne-‐in die opstand en om die resultaat in terme van plantasie produksie te kwantifiseer. ’n Metodiek word voorgestel vir die kwantifisering van die interaksie op die rande tussen die opstand en die buuropstande tydens die leeftyd van die opstand. Die oorplasing van die rand interaksie waarde van die rand af na al die bome in die plantasie word dan gedoen deur om geweegde inverse afstand interpolasie vanaf die rand tot by die ligging van die boom, toe te pas. As die rand interaksie waarde vir elke punt bereken is, kan die omvang van die randeffek gekwantifiseer word. Die ruimtelike omvang van die rand effek is, met die gebruik van breekpunt regressie, empiries afgelei van ’n bestaande ten volle karteerde plantasie. Die verwagte variasie as gevolg van die randeffek word dan met die gebruik van ’n stel modelle gekwantifiseer, wat dan die effek van die rand interaksie op boomhoogte, deursnit en volume kan weergee. Die randeffek word as ’n dinamiese interaksie beskou waarvan die tydsaspek in ag geneem moet word, want die huidige ruimtelike struktuur van die plantasie word beïnvloed deur die huidige omgewing asook deur die historiese ontwikkeling van die omgewing met betrekking tot die opstand onder bespreking. Elke opstand ondergaan ’n randeffek wat uniek is aan daardie plantasie op die gegewe tydstip. Die doelwit is om ’n wyse te vind waarvolgens groei-‐en-‐opbrengs plantasie modellering deur die insluiting van randeffek op ’n praktiese wyse, aangevul kan word. Om hierdie rede is die aanbevole metodiek ruimtelik-‐tydelik en gerig daarop om ’n wyse te vind waarvolgens groei-‐en-‐opbrengs modellering deur die insluiting van die randeffek, op ’n praktiese wyse aangevul kan word. Om randeffek eksplisiet te kwantifiseer, moes die natuurlike afwyking gedeel word in die komponent wat die gevolg is van die randeffek, en ’n tweede komponent wat die gevolg is van ander faktore soos mikroligging toestande en versteurings. Die tweede komponent word behandel as ’n onverklaarde oorblywende afwyking. Hierdie tweede plantasie afwyking moet nogtans kwantifiseer word om sodoende ’n realistiese simulasie van plantasie opbrengs op ’n fyner boom vlak te verkry. Die afwyking wat toegeskryf kan word aan faktore buiten die randeffek, word nageboots deur om ’n lukrake nommer (wat gebaseer word op die afwyking van die binne-‐plantasie gebied wat buite die strekwydte van die randeffek is) deur middel van ‘n geparameteriseerde stogastiese proses te genereer. Sodoende word ’n realistiese ruimtelike patroon van ’n plantasie opstand verkry, wat die randeffek in ag neem en dit kombineer met die natuurlike plantasie afwyking.
Qi, Rui. "Optimization and optimal control of plant growth : application of GreenLab model for decision aid in agriculture". Phd thesis, Châtenay-Malabry, Ecole centrale de Paris, 2010. http://tel.archives-ouvertes.fr/tel-00494918.
Pełny tekst źródłaBoyaval, Sébastien. "Mathematical modelling and numerical simulation in materials science". Phd thesis, Université Paris-Est, 2009. http://tel.archives-ouvertes.fr/tel-00499254.
Pełny tekst źródłaStrandh, Jenny. "A study of solid and liquid inclusion separation at the steel-slag interface". Licentiate thesis, Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-307.
Pełny tekst źródłaNakrani, Sunil. "Biomimetic and autonomic server ensemble orchestration". Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.534214.
Pełny tekst źródłaMercat, Christian. "Analyse Complexe Discrète". Habilitation à diriger des recherches, Université Montpellier II - Sciences et Techniques du Languedoc, 2009. http://tel.archives-ouvertes.fr/tel-00439782.
Pełny tekst źródłaDe, Vega Rodrigo Miguel. "Modeling future all-optical networks without buffering capabilities". Doctoral thesis, Universite Libre de Bruxelles, 2008. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210455.
Pełny tekst źródłaIn the first part we introduce the basic functionality and structure of OBS and OPS networks. We identify the blocking probability as the main performance parameter of interest.
In the second part we study the statistical properties of the traffic that will likely run through these networks. We use for this purpose a set of traffic traces obtained from the Universidad Politécnica de Catalunya. Our conclusion is that traffic entering the optical domain in future OBS/OPS networks will be long-range dependent (LRD).
In the third part we present the model for bufferless OBS/OPS networks. This model takes into account the results from the second part of the thesis concerning the LRD nature of traffic. It also takes into account specific issues concerning the functionality of a typical bufferless packet-switching network. The resulting model presents scalability problems, so we propose an approximative method to compute the blocking probability from it. We empirically evaluate the accuracy of this method, as well as its scalability.
Doctorat en Sciences de l'ingénieur
info:eu-repo/semantics/nonPublished