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Cette thèse traite des problèmes associés à la théorie de grossissement de filtration. Elle est divisée en deux parties.La première partie est consacrée aux temps aléatoires. On étudie les propriétés des différentes classes de temps aléatoires du point de vue du grossissement de la filtration.La deuxième partie concerne l'étude de la stabilité de condition d'arbitrage sur le grossissement de la filtration. On se concentre sur la condition no unbounded profit with bounded risk. Dans un premier temps, on étudie l'absence d'arbitrage dans le cas de grossissement progressif avec un temps aléatoire. Puis on regarde le grossissement initial avec une variable aléatoire qui vérifie l'hypothèse de Jacod. / This thesis treats the problems settled in elargement of filtration theory. It consists of two parts.The first part is devoted to random times. We study the properties of different classes of random times from enlargement of filtration point of view.The second part concerns the study of the stability of the non-arbitrage condition under anlargement of filtration. We are mainly interested in no bounded profit with bounded risk condition. We study absence of arbitrage in the case progressive enlargement up to random time. Then we look at the case of initial enlargement with random variable satisfying Jacod's hypothesis.

The Unidirectional Hybrid Wave Model (UHWM) predicts irregular wave kinematics and pressure accurately in comparison with its linear counterpart and modification, especially near the free surface. Hence, in using the Morrison equation it has been employed in the computation of wave loads on a moored floating structure, such as Spar or TLP (Tension Leg Platform), which can be approximated by a slender body or a number of slender components. Dr. Jun Zhang, with his former and current graduate students, have developed a numerical code, known as COUPLE, over the past two decades, simulating 6 Degree Of Freedom (DOF) motions of a moored floating structures interacting with waves, current and wind. COUPLE employs UHWM as a module for computing wave loads on a floating structure. However, when the duration of simulating the wave-structure interaction is long, say 3 hours (typically required by the offshore industry for extreme storm cases), the computation time of using UHWM increases significantly in comparisons with the counterpart based upon linear wave theory. This study is to develop a numerical scheme which may significantly reduce the CPU time in the use of UHWM and COUPLE. In simulating irregular (or random) waves following a JONSWAP spectrum of a given cut off frequency, the number of free wave components in general grows linearly with the increase of the simulation duration. The CPU time for using a linear spectral method to simulate irregular waves is roughly proportion to N2, where N is the number of free wave components used in simulating irregular waves, while that for using a nonlinear wave model, such as UHWM, it is roughly proportional to N3. Therefore, to reduce the CPU time, the total simulation duration is divided into a number of segments. However, due to the nature of Fast Fourier Transform (FFT), the connection between the two neighboring surface elevations segments is likely discontinuous. To avoid the discontinuity, an overlapped duration between the two neighboring segments is adopted. For demonstration, a free-wave spectrum is input to COUPLE for simulating the 6 DOF motions of a floating 5-MW wind turbine installed on an OC3 moored Spar and tensions in the mooring lines. It is shown that the CPU time for the above simulation for duration of 2048 seconds is reduced from more than16 hours when the irregular wave elevation and kinematics are calculated without dividing into segments to less than three hours when those are calculated by dividing into five segments.

­^¤åºK­n Data pertaining of the volume of circulation as well as the statistical results obtained for advertisement value both indicate that the China Times and the United Daily News are the two most publicly read newspapers during the past three decades dated back from1965 to 1995. China Times and United Daily News preponderate all other publications through numerous crisis and time change while sustaining of market competition including such time when drastic changes need to be dealt with in facing of fierce competition and the shift in the industrial environment; in short, the two publications prevailed. However the hegemony and supremacy these two publications held over the others were challenged by the swift resurrection and revivification within an old competitor- Liberty Times. The cavalcade of industrial competition initiated by the new and improved Liberty Times manifested in a sweeping transformation of the existing industrial structure; consequentially, the market went from being a spilt into allocates of three. The Liberty Times thereby modified the developmental history of the news industry, and made an epoch in the competition within the traditional news industry. Retracing the tracks of the interaction among the three sides in this war of competitive strategies, the researcher discovered that these aberrational competitive behaviors undoubtedly illustrate the characteristics of a hyper-competitive environment. The most apparent of traits comprised of the rapid frequency of the competitor¡¦s enterprising initiatives, the increasing bold and impetuous measures, the rapid decrement of products¡¦ life span, the intrusion of unexpected competitors into the market, and the renaissance of erstwhile businesses. This research will take the Liberty Times as a paradigm in discoursing the directions in which the competitive strategies of the news industries are heading to brace themselves for the unforeseeable trials in this era of hyper-competitive environment. There are many exemplars, related research and applications of the Hyper- Competition Theory in the high-tech and fast cycle markets; however in the standard cycle markets such as the news industries, there is a dearth of comparable research. Cognizant of this situation, this research attempts to discuss the competitive strategies of the Liberty Times in-depth, interpret the interactive relation between the China Times and the United Daily News, and to take the example of TVBS Weekly challenging the China Times Weekly as a precursor of the manifestation of the era of Hyper-Competition to show that the print media can no longer remain stagnant in this hyperactive environment. From the very beginning, the Liberty Times has been in a campaign with strong financial support as its shield, its success seems to foreshadow that the future competition within the news industries will follow this very same pattern.- the pattern of heavy commercialism and capitalism.

Thesis (M.S.)--B.Y.U. Dept. of History and Philosophy of Religion. / Typescript (photocopy). Bibliography: leaves 257-268.

The 1991 reforms to Britain's health service established a quasi-market where the purchasing function was performed by health authorities and those general practices that joined the fund-holding scheme. Whilst the literature lacked any direct comparison of the performance of these agencies as purchasers, there was much controversy about the equity implications of the system. Most notably this focused upon alleged differences in the waiting times for hospital services of patients registered with fund-holding and non fund-holding practices. However, such allegations were based on anecdotal evidence and open to contradiction. The thesis moves this debate beyond a reliance on anecdotal evidence and for one service, elective surgery, redresses the lack of evaluation in the relative merits of fund-holders and health authorities as purchasers. The waiting times of fund-holding and non fund-holding patients for operations covered by the fund-holding scheme were compared at four public providers over a four-year period. Fund-holding patients from the elective waiting list generally had significantly shorter waits than their non fund-holding counterparts. Because such trends became evident after practices joined the scheme, shorter waits were linked to fund-holding status. Another important aim was to ascertain why this tendency occurred. A series of hypotheses were tested, including the generosity of fund-holders' budgets, contrasts in the surgical case mix of each population, plus differences in the way fund-holders and health authorities perform their purchasing roles. An aspect of this last hypothesis was confirmed. Hospitals admitted fund-holding patients sooner to dissuade fund-holding practices from referring elsewhere. This connects to the income hospitals receive from fund-holders being more closely attributable to actual patient throughput than was the case with their income from health authorities. In discussing the policy implications of the study, the thesis then addresses how public sector quasi-markets can work in the contexts of both equity and efficiency.

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A study of the holonomy group of space-time is undertaken and related to the Segre and Petrov types of then Weyl and <I>E</I>-tensors respectively. Attention is then focused on the <I>E</I>-tensor, and a theorem is proved which states that any space-time <I>M</I> can be disjointly decomposed into open sets on which the Segre type of the <I>E</I>-tensor is constant, the union of which if dense in <I>M. </I>This theorem is then applied to prove a similar theorem for the Ricci tensor using the principal null directions of the <I>E</I>-tensor. Finally, a study of proper projective symmetry in null and non-null Einstein-Maxwell and static, spherically symmetric space-times is performed. A theorem is proved which states that no proper projective symmetry is possible in any null Einstein-Maxwell space-times. This result is then extended to the non-null case under some general restrictions. The static, spherically symmetric space-times are then considered, and those admitting proper projective symmetry are completely determined. The proper projective vector fields are also explicitly calculated.

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Thesis (Ph. D.)--University of Wisconsin--Madison, 1975. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.