To see the other types of publications on this topic, follow the link: Variant solution.
Dissertations / Theses on the topic 'Variant solution'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 30 dissertations / theses for your research on the topic 'Variant solution.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Konečný, Petr. "Manažerské rozhodování za rizika a za jistoty - výběr firemního sídla." Master's thesis, Vysoká škola ekonomická v Praze, 2012. http://www.nusl.cz/ntk/nusl-124812.
Full text
2
Sokolová, Eva. "Planetárium." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226046.
Full textAbstract:
The master’s thesis object is to create a design of a load carrying steel structure planetarium. Its ground plan dimensions are 36,1 x 49,0 m. The planetarium hall’s roof is designed with system of trusses and purlins. The projection hall’s roof consists of ribbed cupola with radially arched ribs. The stiffness of the whole construction is ensured with bracings. The walls of the whole object are composed of columns, rails and bracings.
3
Höök, Lars Josef. "Variance reduction methods for numerical solution of plasma kinetic diffusion." Licentiate thesis, KTH, Fusionsplasmafysik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-91332.
Full textAbstract:
Performing detailed simulations of plasma kinetic diffusion is a challenging task and currently requires the largest computational facilities in the world. The reason for this is that, the physics in a confined heated plasma occur on a broad range of temporal and spatial scales. It is therefore of interest to improve the computational algorithms together with the development of more powerful computational resources. Kinetic diffusion processes in plasmas are commonly simulated with the Monte Carlo method, where a discrete set of particles are sampled from a distribution function and advanced in a Lagrangian frame according to a set of stochastic differential equations. The Monte Carlo method introduces computational error in the form of statistical random noise produced by a finite number of particles (or markers) N and the error scales as αN−β where β = 1/2 for the standard Monte Carlo method. This requires a large number of simulated particles in order to obtain a sufficiently low numerical noise level. Therefore it is essential to use techniques that reduce the numerical noise. Such methods are commonly called variance reduction methods. In this thesis, we have developed new variance reduction methods with application to plasma kinetic diffusion. The methods are suitable for simulation of RF-heating and transport, but are not limited to these types of problems. We have derived a novel variance reduction method that minimizes the number of required particles from an optimization model. This implicitly reduces the variance when calculating the expected value of the distribution, since for a fixed error the optimization model ensures that a minimal number of particles are needed. Techniques that reduce the noise by improving the order of convergence, have also been considered. Two different methods have been tested on a neutral beam injection scenario. The methods are the scrambled Brownian bridge method and a method here called the sorting and mixing method of L´ecot and Khettabi[1999]. Both methods converge faster than the standard Monte Carlo method for modest number of time steps, but fail to converge correctly for large number of time steps, a range required for detailed plasma kinetic simulations. Different techniques are discussed that have the potential of improving the convergence to this range of time steps.QC 20120314
4
Stockbridge, Rebecca. "Bias and Variance Reduction in Assessing Solution Quality for Stochastic Programs." Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/301665.
Full textAbstract:
Stochastic programming combines ideas from deterministic optimization with probability and statistics to produce more accurate models of optimization problems involving uncertainty. However, due to their size, stochastic programming problems can be extremely difficult to solve and instead approximate solutions are used. Therefore, there is a need for methods that can accurately identify optimal or near optimal solutions. In this dissertation, we focus on improving Monte-Carlo sampling-based methods that assess the quality of potential solutions to stochastic programs by estimating optimality gaps. In particular, we aim to reduce the bias and/or variance of these estimators. We first propose a technique to reduce the bias of optimality gap estimators which is based on probability metrics and stability results in stochastic programming. This method, which requires the solution of a minimum-weight perfect matching problem, can be run in polynomial time in sample size. We establish asymptotic properties and present computational results. We then investigate the use of sampling schemes to reduce the variance of optimality gap estimators, and in particular focus on antithetic variates and Latin hypercube sampling. We also combine these methods with the bias reduction technique discussed above. Asymptotic properties of the resultant estimators are presented, and computational results on a range of test problems are discussed. Finally, we apply methods of assessing solution quality using antithetic variates and Latin hypercube sampling to a sequential sampling procedure to solve stochastic programs. In this setting, we use Latin hypercube sampling when generating a sequence of candidate solutions that is input to the procedure. We prove that these procedures produce a high-quality solution with high probability, asymptotically, and terminate in a finite number of iterations. Computational results are presented.
5
Pijáčková, Libuše. "Energetický audit občanské stavby." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-240366.
Full textAbstract:
This master thesis is focused on energy audit of a civil building in regards of the state legislati-on. The purpose of this energy audit is to compare energy properties of this civil building and also to design at least two variations of energy savíng solutions. These solutions are designed regarding an economic and ecological focus of the audit and the variations of energy savings.
6
Broderick, Thomas Froats. "The Influence of Microstructure on the Deformation Behavior of Beta Solution Heat Treated and Aged Ti-6Al-2Sn-2Zr-2Mo-2Cr-0.18Si." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1263951781.
Full text
7
Lescot, Numa. "Réduction de variance pour les sensibilités : application aux produits sur taux d'intérêt." Paris 6, 2012. http://www.theses.fr/2012PA066102.
Full textAbstract:
This thesis studies variance reduction techniques for the problem of approximating functionals of diffusion processes, motivated by applications in computational finance to derivatives pricing and hedging. The main tool is Malliavin's stochastic calculus of variations, which yields simulatable representations of both sensitivities and the optimal strategy for variance reduction. In the first part we present a unified view of the control variates and importance sampling methodologies, and give a practical factorization of the optimal strategies. We introduce a parametric importance sampling algorithm and carry out its study in detail. To solve the corresponding optimization problem, we validate two procedures based respectively on stochastic approximation and minimizing an empirical counterpart. Several numerical examples are given which highlight the method's potential. In a second part we combine integration by parts with a Girsanov transform to obtain several stochastic representations of sensitivities. Going beyond a strictly elliptic framework, we show on a class of HJM models with stochastic volatility how to efficiently construct a covering vector field in the sense of Malliavin-Thalmaier. The last chapter, of a more applied nature, deals with a practical case of pricing and hedging exotic rates optionsCette thèse est consacrée à des techniques de réduction de variance pour l'approximation de fonctionnelles de processus de diffusion, motivées par l'évaluation et la couverture de produits dérivés en mathématiques financières. Notre principal outil est le calcul de Malliavin, qui donne des expressions simulables des sensibilités et de la stratégie optimale de réduction de variance. Dans une première partie on donne une présentation unifiée des méthodes de variables de controle et d'échantillonage préférentiel, ainsi qu'une factorisation opératoire des stratégies optimales. On introduit un algorithme d'échantillonnage préférentiel paramétrique dont on mène l'étude détaillée. Pour résoudre le problème d'optimisation associé, nous validons deux procédures basées respectivement sur l'approximation stochastique et la minimisation du critère empirique. Plusieurs exemples numériques illustrent la portée de la méthode. Dans une deuxième partie nous combinons intégration par parties et transformation de Girsanov pour proposer plusieurs représentations stochastiques des sensibilités. Au-delà du cadre strictement elliptique, on montre sur le cas d'un modèle HJM à volatilité stochastique une construction efficace de vecteur couvrant au sens de Malliavin-Thalmaier. Le dernier chapitre, de nature plus appliquée, présente un cas réel d'évaluation et de couverture d'options exotiques sur taux
8
Musil, Jiří. "Studie proveditelnosti." Master's thesis, Vysoká škola ekonomická v Praze, 2011. http://www.nusl.cz/ntk/nusl-124839.
Full textAbstract:
This thesis will describe the problematic of feasibility studies on the base of available literature. Main aim of this diploma thesis is to create feasibility study for the author's own project and to confirm or refuse the basic hypothesis.
9
Boček, Michal. "Přepočet a variantní řešení ocelové konstrukce mostu na drážní komunikaci." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227793.
Full textAbstract:
The subject of this diploma thesis is static verification steel structure of exist railway bridge in accordance with the valid standards. The bridge have three simple spans with a span of 25; 98 and 25 meters, outer fields are simple beams, the middle field is the beam reinforced with an arch with vertical rods. Steel orthotropic deck with longitudinal stiffeners and crossbeams. Further were designed and analyse other possible options super structure of the middle field, and the resulting variant as a circle span with radial rods was detail solved and made documentation.
10
Abbas, Aghababazadeh Farnoosh. "Estimating the Local False Discovery Rate via a Bootstrap Solution to the Reference Class Problem: Application to Genetic Association Data." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/33367.
Full textAbstract:
Modern scientific technology such as microarrays, imaging devices, genome-wide association studies or social science surveys provide statisticians with hundreds or even thousands of tests to consider simultaneously. Testing many thousands of null hypotheses may increase the number of Type $I$ errors. In large-scale hypothesis testing, researchers can use different statistical techniques such as family-wise error rates, false discovery rates, permutation methods, local false discovery rate, where all available data usually should be analyzed together. In applications, the thousands of tests are related by a scientifically meaningful structure. Ignoring that structure can be misleading as it may increase the number of false positives and false negatives. As an example, in genome-wide association studies each test corresponds to a specific genetic marker. In such a case, the scientific structure for each genetic marker can be its minor allele frequency.
In this research, the local false discovery rate as a relevant statistical approach is considered to analyze the thousands of tests together. We present a model for multiple hypothesis testing when the scientific structure of each test is incorporated as a co-variate. The purpose of this model is to incorporate the co-variate to improve the performance of testing procedures. The method we consider has different estimates depending on the tuning parameter. We would like to estimate the optimal value of that parameter by considering observed statistics. Thus, among those estimators, the one which minimizes the estimated errors due to bias and to variance is chosen by applying the bootstrap approach. Such an estimation method is called an adaptive reference class method. Under the combined reference class method, the effect of the co-variates is ignored and all null hypotheses should be analyzed together.
In this research, under some assumptions for the co-variates and the prior probabilities, the proposed adaptive reference class method shows smaller error than the combined reference class method in estimating the local false discovery rate, when the number of tests gets large. We describe the adaptive reference class method to the coronary artery disease data, and we use simulation data to evaluate the performance of the estimator associated with the adaptive reference class method.
11
Zidani, Hafid. "Représentation de solution en optimisation continue, multi-objectif et applications." Phd thesis, INSA de Rouen, 2013. http://tel.archives-ouvertes.fr/tel-00939980.
Full textAbstract:
Cette thèse a pour objectif principal le développement de nouveaux algorithmes globaux pour la résolution de problèmes d'optimisation mono et multi-objectif, en se basant sur des formules de représentation ayant la tâche principale de générer des points initiaux appartenant à une zone proche du minimum globale. Dans ce contexte, une nouvelle approche appelée RFNM est proposée et testée sur plusieurs fonctions non linéaires, non différentiables et multimodales. D'autre part, une extension à la dimension infinie a été établie en proposant une démarche pour la recherche du minimum global. Par ailleurs, plusieurs problèmes de conception mécanique, à caractère aléatoire, ont été considérés et résolus en utilisant cette approche, avec amélioration de la méthode multi-objectif NNC. Enfin, une contribution à l'optimisation multi-objectif par une nouvelle approche a été proposée. Elle permet de générer un nombre suffisant de points pour représenter la solution optimale de Pareto.
12
Konečný, Michael. "Porovnání analytického a numerického MKP řešení vzpěrné stability laminátových kompozitních válcových skořepin." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230525.
Full textAbstract:
Tato práce zkoumá možností řešení kritické síly vzpěrné stability laminátových kompozitních válcových skořepin jak analytickým tak MKP přístupem. Analytické řešení je prezentováno detailně a je zpracován Matlab program pro jeho výpočet. MKP řešení je prováděno ve dvou řešičích softwaru MSC.Nastran, jsou zjišťována vhodná nastavení těchto řešičů a jejich chování. Všechny způsoby řešení jsou na závěr porovnány a je navrženo několik závěrů.
13
Kubeš, Jan. "Posouzení vlivu variantních technologií na celkovou cenu stavebního díla." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-240364.
Full textAbstract:
The thesis aims to assess the impacts of alternative technologies considered an object from the perspective of an investor or contractor. They are sought and assessed the savings in a variety of alternative solutions building structures. Found savings serves investor as an important basis for deciding between different materials or when making a tender for the realization of the construction. The practical part is devoted to assessing the price of material changes and an assessment of the savings when you change the original price of gravel for the price-house.
14
Grudė, Tomas. "Prekybos ir pramogų centro Geležinio Vilko gatvėje Vilniuje laikančiųjų konstrukcijų sprendinių analizė." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2011. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20110620_141908-64691.
Full textAbstract:
Baigiamajame magistro darbe nagrinėjami galimi prekybos ir pramogų centro perdangos ir ledo arenos denginio pagrindinių laikančiųjų konstrukcijų variantai, įvertinami jų techniniai– ekonominiai rodikliai, parenkamas racionalus konstrukcijų variantas tolesniam pastato projektavimui. Nagrinėjamas gelžbetoninės ledo arenos denginio arkos patikimumas, išskiriami rodikliai, darantys didžiausią įtaką konstrukcijos patikimumui, atliekama konstrukcijos parametrinė analizė. Pateikiamos baigiamojo darbo išvados. Projektuojama briaunotoji TT tipo denginio plokštė, gelžbetoninė dviejų lankstų denginio arka su iš anksto įtempta styga, kolona ir polinis pamatas, parengiami šių konstrukcijų darbo brėžiniai. Darbą sudaro 11 dalių: įvadas, aiškinamasis raštas, techninė-ekonominė, konstrukcijų projektavimo ir patikimumo analizės dalys, išvados, literatūros sąrašas. Darbo apimtis – 149 p. teksto be priedų, 43 iliustr., 27 lent., 34 bibliografiniai šaltiniai, 9 A1 lapai brėžinių. Atskirai pridedami darbo priedai.This MA thesis focuses on the possible versions of floors in a Shopping and Entertainment Centre as well as the roof load-bearing constructions of an Ice Arena. Their technical and economic parameters are evaluated and a rational construction option for the further building design is selected. This thesis analyses the reliability of the reinforced concrete arch in the Ice Arena, and the parameters that have the biggest influence on the reliability of the construction are singled out. The parameter analysis of the construction is presented. The thesis ends with concluding remarks. The design features a double tee-type roof slab, a reinforced concrete two-hinged arch with a pre-stressed tie, a column and a pile foundation. The working drawings of the above-mentioned constructions are drafted. The thesis consists of 11 parts: the introduction, the expository letter, the technological-economic part, the parts dealing with the construction design and reliability analysis, the conclusions, the bibliography, etc. The scope of the thesis is as follows: 149 pages of text without annexes, 43 figures, 27 tables, 34 bibliographical sources and 9 A1-size pages of drawings. There are annexes attached to the thesis.
15
Čapek, Dušan. "Cenové porovnání variantního technického řešení stavebního objektu." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-265633.
Full textAbstract:
The subject of this thesis is to compare the price of a variant of the technical solution to a specific building. On introduction describes the various parts of the construction budget and their origins. In the practical part the comparison of alternative building materials on the basis of their technical characteristics. Victorious materials are inserted into the original budget, so a change was made final price of the building.
16
Žwaková, Vendula. "Administrativní budova JmP." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226073.
Full textAbstract:
The subject of this Master’s thesis was recalculation and design two variants of existing supporting steel structure storey administrative building which is located in the complex of Jihomoravská plynárenská a.s. in the city center of Brno. Dimensions and disposition based on the specifications of the Master‘s thesis. The total height of the structure is 29.46 m and circular platform has a diameter of 16.088 m. The supporting structure of an existing building consists of circumferential lattice structure. The main supporting elements of both variants are columns. Option A has 8 columns. Option B has 16 columns. These two variants were preliminarily designed and statically evaluated. After that was made a comparison of variants, and one was selected for more detailed processing (Option A). This included the calculation of anchorage, draft of mounting joints, technical report and drawing documentation.
17
Hývnarová, Petra. "Rozhodovací analýza výběru informačního systému pro malou firmu." Master's thesis, Vysoká škola ekonomická v Praze, 2010. http://www.nusl.cz/ntk/nusl-74985.
Full textAbstract:
This diploma deals with the use of decision analysis methods to solve the decision problem of selecting an information system for small business. The theoretical part explains the basic concepts, methods and procedures related to information systems and decision theory, the practical part use methods of the decision analysis and chose the best option and suggest the optimal decision.
18
Čechová, Pavla. "Vztah typologie a konstrukční soustavy." Doctoral thesis, Vysoké učení technické v Brně. Fakulta architektury, 2015. http://www.nusl.cz/ntk/nusl-233257.
Full text
19
Thiéry, Christophe. "Itération sur les politiques optimiste et apprentissage du jeu de Tetris." Thesis, Nancy 1, 2010. http://www.theses.fr/2010NAN10128/document.
Full textAbstract:
Cette thèse s'intéresse aux méthodes d'itération sur les politiques dans l'apprentissage par renforcement à grand espace d'états avec approximation linéaire de la fonction de valeur. Nous proposons d'abord une unification des principaux algorithmes du contrôle optimal stochastique. Nous montrons la convergence de cette version unifiée vers la fonction de valeur optimale dans le cas tabulaire, ainsi qu'une garantie de performances dans le cas où la fonction de valeur est estimée de façon approximative. Nous étendons ensuite l'état de l'art des algorithmes d'approximation linéaire du second ordre en proposant une généralisation de Least-Squares Policy Iteration (LSPI) (Lagoudakis et Parr, 2003). Notre nouvel algorithme, Least-Squares [lambda] Policy Iteration (LS[lambda]PI), ajoute à LSPI un concept venant de [lambda]-Policy Iteration (Bertsekas et Ioffe, 1996) : l'évaluation amortie (ou optimiste) de la fonction de valeur, qui permet de réduire la variance de l'estimation afin d'améliorer l'efficacité de l'échantillonnage. LS[lambda]PI propose ainsi un compromis biais-variance réglable qui peut permettre d'améliorer l'estimation de la fonction de valeur et la qualité de la politique obtenue. Dans un second temps, nous nous intéressons en détail au jeu de Tetris, une application sur laquelle se sont penchés plusieurs travaux de la littérature. Tetris est un problème difficile en raison de sa structure et de son grand espace d'états. Nous proposons pour la première fois une revue complète de la littérature qui regroupe des travaux d'apprentissage par renforcement, mais aussi des techniques de type évolutionnaire qui explorent directement l'espace des politiques et des algorithmes réglés à la main. Nous constatons que les approches d'apprentissage par renforcement sont à l'heure actuelle moins performantes sur ce problème que des techniques de recherche directe de la politique telles que la méthode d'entropie croisée (Szita et Lorincz, 2006). Nous expliquons enfin comment nous avons mis au point un joueur de Tetris qui dépasse les performances des meilleurs algorithmes connus jusqu'ici et avec lequel nous avons remporté l'épreuve de Tetris de la Reinforcement Learning Competition 2008This thesis studies policy iteration methods with linear approximation of the value function for large state space problems in the reinforcement learning context. We first introduce a unified algorithm that generalizes the main stochastic optimal control methods. We show the convergence of this unified algorithm to the optimal value function in the tabular case, and a performance bound in the approximate case when the value function is estimated. We then extend the literature of second-order linear approximation algorithms by proposing a generalization of Least-Squares Policy Iteration (LSPI) (Lagoudakis and Parr, 2003). Our new algorithm, Least-Squares [lambda] Policy Iteration (LS[lambda]PI), adds to LSPI an idea of [lambda]-Policy Iteration (Bertsekas and Ioffe, 1996): the damped (or optimistic) evaluation of the value function, which allows to reduce the variance of the estimation to improve the sampling efficiency. Thus, LS[lambda]PI offers a bias-variance trade-off that may improve the estimation of the value function and the performance of the policy obtained. In a second part, we study in depth the game of Tetris, a benchmark application that several works from the literature attempt to solve. Tetris is a difficult problem because of its structure and its large state space. We provide the first full review of the literature that includes reinforcement learning works, evolutionary methods that directly explore the policy space and handwritten controllers. We observe that reinforcement learning is less successful on this problem than direct policy search approaches such as the cross-entropy method (Szita et Lorincz, 2006). We finally show how we built a controller that outperforms the previously known best controllers, and shortly discuss how it allowed us to win the Tetris event of the 2008 Reinforcement Learning Competition
20
Noumon, Allini Elie. "Caractérisation, évaluation et utilisation du jitter d'horloge comme source d'aléa dans la sécurité des données." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSES019.
Full textAbstract:
Cette thèse, financée par la DGA, est motivée par la problématique d’évaluation des TRNG pour des applications à très haut niveau de sécurité. Les standards actuels tels que AIS-31 n’étant pas suffisants pour ces types d’applications, la DGA propose une procédure complémentaire, validée sur les TRNG utilisant les oscillateurs en anneau (RO), qui vise à caractériser la source d’aléa des TRNG afin d’identifier les bruits électroniques présents dans celle-ci. Ces bruits se traduisent dans les circuits numériques par le jitter d’horloge générée dans les RO. Ils peuvent être caractérisés par leur densité spectrale de puissance reliée à la variance d’Allan temporelle qui permet, contrairement à la variance standard pourtant encore largement utilisée, de discriminer ces différents types de bruit (thermique, flicker principalement). Cette étude a servi de base à l’estimation de la part du jitter due au bruit thermique utilisé dans les modèles stochastiques décrivant la sortie des TRNG. Afin d’illustrer et de valider l’approche de certification DGA sur d’autres principes de TRNG que les RO, nous proposons une caractérisation de la PLL en tant que source d’aléa. Nous avons modélisé la PLL en termes de fonctions de transfert. Cette modélisation a conduit à l’identification de la source de bruit en sortie de la PLL, ainsi que de sa nature en fonction des paramètres physiques de la PLL. Cela a permis de proposer des recommandations quant au choix des paramètres afin de garantir une entropie maximale. Afin d’aider à la conception de ce type de TRNG, nous proposons également un outil de recherche des paramètres non physiques du générateur assurant le meilleur compromis sécurité/débitThis thesis, funded by the DGA, is motivated by the problem of evaluation of TRNG for applications with a very high level of security. As current standards such as AIS-31 are not sufficient for these types of applications, the DGA proposes a complementary procedure, validated on TRNG using ring oscillators (RO), which aims to characterize the source of randomness of TRNG in order to identify electronic noises present in it. These noises are manifested in the digital circuits by the clock jitter generated in the RO. They can be characterized by their power spectral density related to the time Allan variance which allows, unlike the standard variance which is still widely used, to discriminate these different types of noise (mainly thermal, flicker). This study was used as a basis for estimating the proportion of jitter due to thermal noise used in stochastic models describing the output of TRNG. In order to illustrate and validate the DGA certification approach on other principles of TRNG apart from RO, we propose a characterization of PLL as a source of randomness. We have modeled the PLL in terms of transfer functions. This modeling has led to the identification of the source of noise at the output of the PLL, as well as its nature as a function of the physical parameters of the PLL. This allowed us to propose recommendations on the choice of parameters to ensure maximum entropy. In order to help in the design of this type of TRNG, we also propose a tool to search for the non-physical parameters of the generator ensuring the best compromise between security and throughput
21
Bubláková, Petra. "Výběr informačního systému pro firmu." Master's thesis, Vysoké učení technické v Brně. Ústav soudního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-433382.
Full text
22
"Qualitative behavior of solutions to the compressible Navier-Stokes equations and its variants." 2004. http://library.cuhk.edu.hk/record=b6073691.
Full textAbstract:
Li Jing."June 2004."
Thesis (Ph.D.)--Chinese University of Hong Kong, 2004.
Includes bibliographical references (p. 66-71).
Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Mode of access: World Wide Web.
Abstracts in English and Chinese.
23
"Minimax solution to multi-mode portfolio selection models with a mean-variance formulation." 2003. http://library.cuhk.edu.hk/record=b5891628.
Full textAbstract:
Li, Rui.Thesis (M.Phil.)--Chinese University of Hong Kong, 2003.
Includes bibliographical references (leaves 69-71).
Abstracts in English and Chinese.
Chapter 1 --- Introduction --- p.1
Chapter 1.1 --- Portfolio Selection Models --- p.1
Chapter 1.1.1 --- Single Period Models --- p.2
Chapter 1.1.2 --- Multi-Period Models --- p.4
Chapter 1.1.3 --- Continuous-Time Model --- p.5
Chapter 1.2 --- Description and Motivation of New Model --- p.6
Chapter 1.3 --- Major Contributions --- p.7
Chapter 1.4 --- Thesis Organization --- p.8
Chapter 2 --- Formulation and General Methodology --- p.9
Chapter 2.1 --- Formulation --- p.9
Chapter 2.1.1 --- Dynamics --- p.10
Chapter 2.1.2 --- General Form --- p.13
Chapter 2.1.3 --- Assumptions --- p.13
Chapter 2.2 --- Methodology --- p.15
Chapter 2.2.1 --- Weighting Problem --- p.15
Chapter 2.2.2 --- Search For Optimal Weighting Coefficient --- p.19
Chapter 3 --- Model I: A Trade-off Between Risk and Return Is Given --- p.22
Chapter 3.1 --- Problem Formulation --- p.22
Chapter 3.2 --- Solution to the Parameterized Weighting Problem (PWP(γ)) --- p.23
Chapter 3.2.1 --- "Construction of the Auxiliary Problem A(γ, λ)" --- p.24
Chapter 3.2.2 --- Discussion on Parameter A --- p.29
Chapter 3.3 --- Algorithm --- p.39
Chapter 4 --- Model II: Expected Return Level Is Specified --- p.42
Chapter 4.1 --- Problem Formulation --- p.42
Chapter 4.2 --- Optimal Max-Min Solution --- p.44
Chapter 4.3 --- Discussion on Parameter λ --- p.50
Chapter 4.4 --- Algorithm --- p.55
Chapter 5 --- Numerical Examples --- p.58
Chapter 6 --- Conclusions --- p.67
Bibliography --- p.71
24
Ho, Kuenlong, and 何昆龍. "Analytical solution of curvature and curvature-varient of Higher-Order Helical Line in Multi-Layered Wire Rope." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/36260887576564042034.
Full textAbstract:
碩士國立中興大學
土木工程學系
90
A new precise approach to determine the curvature of higher order helical line, which can be used to describe the center line of an outside strand of a wire rope with multi-helical centers, is presented in this thesis. This approach is based on an analogous concept, which is the relative rotational motion of particles around fixed and moving axes. The helical center of a wire is imagined as the center line of the rotation, the center line of an wire is imagined as the track of the particle. For the above analogy, the curvature of a wire can be visualized the component of angular velocity of the particle. The curvature of first-order helical line would be derived first, and similarly procedures could be applied to derive the curvature of higher-order helical line. Recursiveness of the approach is fined. The results of the curvature of higher-order helical line can be concisely expressed, and can be used to derive the mechanics of wire rope.
25
Wang, Jian. "Numerical Methods for Continuous Time Mean Variance Type Asset Allocation." Thesis, 2010. http://hdl.handle.net/10012/5078.
Full textAbstract:
Many optimal stochastic control problems in finance can be formulated in the form of Hamilton-Jacobi-Bellman (HJB) partial differential equations (PDEs). In this thesis, a general framework for solutions of HJB PDEs in finance is developed, with application to asset allocation.
The numerical scheme has the following properties: it is unconditionally stable; convergence to the viscosity solution is guaranteed; there are no restrictions on the underlying stochastic process; it can be easily extended to include features as needed such as uncertain volatility and transaction costs; and central differencing is used as much as possible so that use of a locally second order method is maximized.
In this thesis, continuous time mean variance type strategies for dynamic asset allocation problems are studied. Three mean variance type strategies: pre-commitment mean
variance, time-consistent mean variance, and mean quadratic variation, are investigated. The numerical method can handle various constraints on the control policy. The following cases are studied: allowing bankruptcy (unconstrained case), no bankruptcy, and bounded control. In some special cases where analytic solutions are available, the numerical results agree with the analytic solutions.
These three mean variance type strategies are compared. For the allowing bankruptcy case, analytic solutions exist for all strategies. However, when additional constraints are applied to the control policy, analytic solutions do not exist for all strategies. After realistic constraints are applied, the efficient frontiers for all three strategies are very similar. However, the investment policies are quite different. These results show that, in deciding which objective function is appropriate for a given economic problem, it is not sufficient to simply examine the efficient frontiers. Instead, the actual investment policies need to be studied in order to determine if a particular strategy is applicable to specific investment problem.
26
Vesenmayer, Bernhard Antonin Johannes [Verfasser]. "Efficient numerical solution of the variance-optimal hedging problem in geometric Lévy models / Bernhard Antonin Johannes Vesenmayer." 2009. http://d-nb.info/99503205X/34.
Full text
27
Shen, Yun-nan, and 沈芸楠. "Problems and Solutions of the Variant Design of Manufacturing Execution System: A Study of Enterprise Transformation of Company C’s Older Generation Plants." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/58008510429894453021.
Full textAbstract:
碩士國立中央大學
資訊管理學系在職專班
102
Founded on May 4, 1971, Company C is a joint venture of Tatung Company. Company C used to be the world’s biggest producer of the picture tube for CRT monitors and Taiwan’s third largest manufacturer of liquid-crystal panels. After suffering a setback in founding plants and facing a the U.S. Department of Justice’s antitrust accusations in 2001-2006, this company advanced the process of enterprise transformation for two of its older generation (4.5) plants and converted them into exclusive plants of small- and medium-scale manufacturing processes in 2007, which was three earlier than its competitors. However, the previous setback in investment and law suits in the U.S. had resulted in less abundant funds. The financial crises of 2008 and 2009 also limited its expansion to minimal replacement of equipment and devices. Consequently, the company only managed to meet the demands of the market by providing information services after the transformation. For a high-tech contractor as such, replacement of equipment and devices certainly entails major change in manufacturing execution system (MES). Apart from high costs, the production line would fail to operate. Under the circumstance, lack of profits would have meant Company C’s losing the opportunity of transformation. In order to survive and maintain the operations, the management changed their thinking and used the internal MES team as a pioneer to implement a least-cost variant design of the system on the premise of minimizing the impact on the existing equipment and devices. The production line were expected to simultaneously support the production of IT monitors and small- and medium-size products. In 2011, the company achieved a shipped quantity of over twenty million small and medium panels in a single month, making itself the most productive supplier of the above-mentioned products in the world. This thesis has used the successful case of Company C to study its challenges in implementing the corporate strategy by utilizing the variant design of MES to support the transformational tasks under the financial pressure in addition to the development of solutions for survival after transformation.
28
Axmann, Šimon. "Mathematical analysis of equations describing the flow of compressible heat conducting fluids." Doctoral thesis, 2016. http://www.nusl.cz/ntk/nusl-352092.
Full textAbstract:
Title: Mathematical analysis of equations describing the flow of compressible heat conducting fluids Author: Šimon Axmann Department: Mathematical Institute of Charles University Supervisor: doc. Mgr. Milan Pokorný, Ph.D., Mathematical Institute of Charles University Abstract: The present thesis is devoted to the mathematical analysis of equa- tions describing the flow of viscous compressible newtonian fluid in various time regimes. In particular, we present existence results for three problems arising as special cases of a general model derived in the introductory part. The first chap- ter deals with time-periodic solutions to the full Navier-Stokes-Fourier system for heat-conducting fluid. The second chapter contains the proof of existence of steady solutions to a system arising from phase field model for two-phase com- pressible fluid. Finally, in the last section we study steady strong solutions to the Navier-Stokes equations under the additional assumption that the fluid is suffi- ciently dense. For each problem a different concept of the solution is considered, on the other hand in all cases an essential role is played by the crucial quantity effective viscous flux. Keywords: compressible Navier-Stokes system; weak solution; entropy variational solution; large data
29
Adeyefa, Segun Adeyemi. "Satisficing solutions for multiobjective stochastic linear programming problems." Thesis, 2011. http://hdl.handle.net/10500/5703.
Full textAbstract:
Multiobjective Stochastic Linear Programming is a relevant topic. As a matter of fact,
many real life problems ranging from portfolio selection to water resource management
may be cast into this framework.
There are severe limitations in objectivity in this field due to the simultaneous presence
of randomness and conflicting goals. In such a turbulent environment, the mainstay of
rational choice does not hold and it is virtually impossible to provide a truly scientific
foundation for an optimal decision.
In this thesis, we resort to the bounded rationality and chance-constrained principles to
define satisficing solutions for Multiobjective Stochastic Linear Programming problems.
These solutions are then characterized for the cases of normal, exponential, chi-squared
and gamma distributions.
Ways for singling out such solutions are discussed and numerical examples provided for
the sake of illustration.
Extension to the case of fuzzy random coefficients is also carried out.Decision Sciences
30
Adeyefa, Segun Adeyemi. "Satisticing solutions for multiobjective stochastic linear programming problems." Thesis, 2011. http://hdl.handle.net/10500/5703.
Full textAbstract:
Multiobjective Stochastic Linear Programming is a relevant topic. As a matter of fact,
many real life problems ranging from portfolio selection to water resource management
may be cast into this framework.
There are severe limitations in objectivity in this field due to the simultaneous presence
of randomness and conflicting goals. In such a turbulent environment, the mainstay of
rational choice does not hold and it is virtually impossible to provide a truly scientific
foundation for an optimal decision.
In this thesis, we resort to the bounded rationality and chance-constrained principles to
define satisficing solutions for Multiobjective Stochastic Linear Programming problems.
These solutions are then characterized for the cases of normal, exponential, chi-squared
and gamma distributions.
Ways for singling out such solutions are discussed and numerical examples provided for
the sake of illustration.
Extension to the case of fuzzy random coefficients is also carried out.Decision Sciences