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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Apichatpong Weerasethakul entre réalité et imaginaire / Apichatpong Weerasethakul between reality and imagination

Lee, Sun-Woo 20 June 2017 (has links)
Cette étude est consacrée à l’analyse de la coexistence de la réalité et de l’imaginaire dans l’œuvre d’Apichatpong Weerasethakul. Les modalités de rencontre et de croisement de ces deux dimensions dans un film ou entre des films sont éclaircies à travers des observations pratiques et détaillées. Partant de l’analyse de l’influence de deux cultures différentes – la sensibilité autochtone thaïlandaise et la tendance du cinéma expérimental occidental – nous envisageons d’une part les modalités de captation des scènes de la vie réelle et d’autre part la manière de découvrir et de révéler le côté invisible qui entoure ce champ visible. La narration filmique est représentée de manière diverse en déviant de la règle classique. Dans le processus de formation d’une histoire, des matières hétérogènes sont englobées et des textes divers sont connectés. Par ailleurs, l’univers flexible et libre de Weerasethakul présuppose toujours des temps multiples virtuels, caractéristique essentielle que l’on retrouve dans toutes ses œuvres, des courts-métrages aux installations en passant par les long-métrages. Par conséquent, la distinction entre la dimension réelle et la dimension irréelle/surréelle perd en clarté ; la ligne de distinction est quasiment annulée. Le réalisateur propose ainsi une autre vision du monde se basant sur la tradition bouddhique thaïlandaise qui pourrait sembler absurde du point de vue du rationalisme moderne de l’Occident. En traversant ainsi les discussions autour du monde hybride de Weerasethakul, cette étude a pour ambition de démontrer que son cinéma (re)trouve la beauté et la puissance de la réalité à travers l’imaginaire. / This study is about the analysis of the coexistence of reality and imagination in the work of Apichatpong Weerasethakul. The modalities of encountering and crossing of these two dimensions in a film or between films are clarified through practical and detailed observations. On the basis of an analysis of the influence of two different cultures – the Thai indigenous sensibility and the tendency of Western experimental cinema –, we search on the one hand the modalities of capturing the scenes of real life, and on the other hand how to discover and reveal the invisible side that surrounds this visible field. The narrative of his films is represented in a diverse way by deviating from the classical rule. In the process of forming a narrative, heterogeneous materials are embraced and various texts are connected. Moreover, the flexible and free world of Weerasethakul always presupposes virtual multiple times, an essential characteristic that can be found in all his works, from short films to installations to the feature films. Therefore, the distinction between the real dimension and the unreal / surreal dimension loses clarity; the line of distinction is virtually canceled. The filmmaker thus proposes another view of the world based on the Thai Buddhist tradition that might seem absurd from the point of view of modern rationalism of the West. By crossing the discussions around the hybrid world of Weerasethakul, this study aims to demonstrate that his cinema (re)finds the beauty and power of reality through the imagination.
12

Design of a selective parallel heuristic algorithm for the vehicle routing problem on an adaptive object model

Moolman, A.J. (Alwyn Jakobus) 19 November 2010 (has links)
The Vehicle Routing Problem has been around for more than 50 years and has been of major interest to the operations research community. The VRP pose a complex problem with major benefits for the industry. In every supply chain transportation occurs between customers and suppliers. In this thesis, we analyze the use of a multiple pheromone trial in using Ant Systems to solve the VRP. The goal is to find a reasonable solution for data environments of derivatives of the basic VRP. An adaptive object model approach is followed to allow for additional constraints and customizable cost functions. A parallel method is used to improve speed and traversing the solution space. The Ant System is applied to the local search operations as well as the data objects. The Tabu Search method is used in the local search part of the solution. The study succeeds in allowing for all of the key performance indicators, i.e. efficiency, effectiveness, alignment, agility and integration for an IT system, where the traditional research on a VRP algorithm only focuses on the first two. / Thesis (PhD)--University of Pretoria, 2010. / Industrial and Systems Engineering / unrestricted
13

Automatic Prevention and Recovery of Aircraft Loss-of-Control by a Hybrid Control Approach

Zhao, Yue 04 August 2016 (has links)
No description available.
14

Time-window optimization for a constellation of earth observation satellite

Oberholzer, Christiaan Vermaak 02 1900 (has links)
Thesis (M.Com.(quantitative Management)) / Satellite Scheduling Problems (SSP) are NP-hard and constraint programming and metaheuristics solution methods yield mixed results. This study investigates a new version of the SSP, the Satellite Constellation Time-Window Optimization Problem (SCoTWOP), involving commercial satellite constellations that provide frequent earth coverage. The SCoTWOP is related to the dual of the Vehicle Routing Problem with Multiple Timewindows, suggesting binary solution vectors representing an activation of time-windows. This representation fitted well with the MatLab® Genetic Algorithm and Direct Search Toolbox subsequently used to experiment with genetic algorithms, tabu search, and simulated annealing as SCoTWOP solution methods. The genetic algorithm was most successful and in some instances activated all 250 imaging time-windows, a number that is typical for a constellation of six satellites. / Quantitative Management
15

價量分析之理論實務與實證

蕭必偉, XIAO,BI-WEI Unknown Date (has links)
證券市場和一般商品市場本質上有所不同; 一般商品市場的需求和供給者是截然劃分 的集團; 而證券市場是一個流通市場, 其參與者既是需求者亦是供給者, 以經濟學理 論來預測分析, 解釋證券市場行為是一種主流, 而價格和數量又是經濟學領域中最主 要兩個變數; 環視現代探討證券市場行為的文章, 大部份只偏重於價格或數量單方面 之探討; 或價格與數量間單方向因果關系的研究, 由這些研究所得結論來說明證券市 場價格和數量間關系顯然不夠, 例如在探討未來價格變動時除了前期價格因素外, 尚 有數量因素會影響未來價格因素的發展。 多元時間序列分析方法系直接使用多個變數數列資料間所顯示之自我相關特性及交叉 相關特性以設定出變數間可能存在的因果關系, 而且其具有以下之優點。(1) 序列與 序列之間可能存在領先、同時、及回饋等多種關系, 藉著MARMA 模型之設定即可顯示 多個序列間基本之動態關系。(2) 聯合多個數列來建立模型亦可利用其他數列所提供 情報提高預測之準確性。(3) 介之分析(Intervention Analysis) 或季節因素之調整 都可由MARMA 模型之建之得到更精確的結果。 本文即利用多元時間序列模式(Multiple Time Series Models簡稱MARMA)分析方法, 探討證券市場價格與數量同時對數量或同時對價格的影響。
16

Time-window optimization for a constellation of earth observation satellite

Oberholzer, Christiaan Vermaak 02 1900 (has links)
Thesis (M.Com.(quantitative Management)) / Satellite Scheduling Problems (SSP) are NP-hard and constraint programming and metaheuristics solution methods yield mixed results. This study investigates a new version of the SSP, the Satellite Constellation Time-Window Optimization Problem (SCoTWOP), involving commercial satellite constellations that provide frequent earth coverage. The SCoTWOP is related to the dual of the Vehicle Routing Problem with Multiple Timewindows, suggesting binary solution vectors representing an activation of time-windows. This representation fitted well with the MatLab® Genetic Algorithm and Direct Search Toolbox subsequently used to experiment with genetic algorithms, tabu search, and simulated annealing as SCoTWOP solution methods. The genetic algorithm was most successful and in some instances activated all 250 imaging time-windows, a number that is typical for a constellation of six satellites. / Quantitative Management
17

Contribution au pronostic des systèmes à base de modèles : théorie et application / Contribution to nonlinear systems prognosis based on models : theory and application

Gucik-Derigny, David 09 December 2011 (has links)
Cette thèse est une contribution au problème du pronostic des systèmes complexes. Plus précisément, elle concerne l'approche basée modèles et est composée de trois contributions principales. Tout d'abord, dans une première contribution une définition du concept de pronostic est proposée et est positionnée par rapport aux concepts de diagnostic et de diagnostic prédictif. Pour cela, une notion de contrainte temporelle a été introduite afin de donner toute pertinence à la prédiction réalisée. Il a également été montré comment le pronostic est lié à la notion d'accessibilité en temps fini.La deuxième contribution est dédiée à l'utilisation des observateurs à convergence en temps fini pour la problématique du pronostic. Une méthodologie de pronostic est présentée pour les systèmes non linéaires à échelle de temps multiple. Puis, une troisième contribution est introduite par l'utilisation des observateurs par intervalle pour le pronostic. Une méthodologie de pronostic est proposée pour les systèmes non linéaires incertains à échelle de temps multiple. Pour illustrer les différents résultats théoriques, des simulations ont été conduites sur un modèle de comportement d'un oscillateur électromécanique. / This thesis is a contribution to the problem of a complex system prognosis. More precisely, it concerns the model-based prognosis approach and the thesis is divided into three main contributions. First of all, a definition of prognosis concept is proposed as a first contribution and is positionned in reference to the diagnosis and predictive diagnosis concepts. For that, a notion of temporal constraint is introduced to give all pertinence to the prediction achieved. It is also shown how prognosis is linked to the finite time reachability notion. The second contribution is dedicated to the use of finite time convergence observer for the prognosis problem. A prognosis methodology is presented for nonlinear multiple time scale systems. Then, a last contribution is introduced through the use of interval observer for the prognosis problem. A pronognosis methodology is proposed for nonlinear uncertain multiple time scale systems. To illustrate the theorical results, simulations are achieved based on a model of an electromechanical oscillator system.

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