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A Work Project, presented as part of the requirements for the Award of a Masters Degree in Management from the NOVA – School of Business and Economics
Many existing encrypted Internet protocols leak information through packet sizes and timing. Though seemingly innocuous, prior work has shown that such leakage can be used to recover part or all of the plaintext being encrypted. The prevalence of encrypted protocols as the underpinning of such critical services as e-commerce, remote login, and anonymity networks and the increasing feasibility of attacks on these services represent a considerable risk to communications security. Existing mechanisms for preventing traffic analysis focus on re-routing and padding. These prevention techniques have considerable resource and overhead requirements. Furthermore, padding is easily detectable and, in some cases, can introduce its own vulnerabilities. To address these shortcomings, we propose embedding real traffic in synthetically generated ...
Not long ago, to evaluate the feasibility of a cogeneration project, a simple economic analysis, that considered capital required, operations and maintenance savings, was sufficient. However, under present economic uncertainties (and highly competitive business environment) the situation has changed dramatically. It is now essential to do an in-depth evaluation to insure that very diverse and applicable factors are determined and properly evaluated. This paper will go beyond the "nuts and bolts" analysis of cogeneration economics. It will enumerate and discuss diverse factors, such as, but not limited to: Fuel Considerations, Heat System Analysis, Electric Power Considerations, Key Technical Project Considerations, and Economic Analysis.
Die Berechtigung der klassischen Infinitesimalrechung, wie sie heute verwendet wird, steht außer Frage. Trotzdem hat sich eine weitere Richtung im Umgang mit der Analysis entwickelt - die Nichtstandard-Analysis. Die vorliegende Arbeit beschäftigt sich mit verschiedenen Zugängen zur Nichtstandard-Analysis. Es gibt bis heute viele verschiedene Wege, wie man sich der Nichtstandard-Analysis nähern kann. Den wesentlichstenUnterschied, macht es, ob man die den konstruktiven Weg von Abraham Robinson oderden axiomatische Weg von Edward Nelson wählt. In der vorliegenden Arbeit werden zwei Zugänge zur Nichtstandard-Analysis, die auf Robinsons Ansätzen aufbauen, genauer betrachtet und verglichen. Der erste Zugang, der beschrieben wird, ist der, den Dieter Landers und Lothar Rogge in ihrem „Buch Nichtstandard Analysis“ [Landers, Dieter und Ro...
The field of fluid-structure interaction is combined with the field of stochastics to perform a stochastic flutter analysis. Various methods to directly incorporate the effects of uncertainties in the flutter analysis are investigated. The panel problem with a supersonic fluid flowing over it is considered as a testcase. The stochastic moments (mean, standard deviation, etc.) of the flutter point are computed by an uncertainty analysis. Sensitivity-based methods are used to determine the stochastic moments of the flutter point. This is done by implicit differentiation of the flutter requirement. The moments can also be determined using the spectral method, which can be considered as a projection method. An iterative solution to the general random eigenvalue problem is proposed for determining the spectral expansion of the flutter poin...
Introduction: Market definition analysis, which is often central in merger cases, usually claims to follow the 1992 Horizontal Merger Guidelines issued by the U.S. Department of Justice and the Federal Trade Commission (“Guidelines”). The Guidelines describe a relevant product market as a group of products for which a hypothetical monopolist would profitably impose a “small but significant and non-transitory increase in price” (“SSNIP”). Seeking relatively simple approaches to market definition that are consistent with the Guidelines, courts and agencies often rely on Critical Loss Analysis. For example, the FTC recently challenged the proposed merger between Whole Foods and Wild Oats, two chains of grocery stores, alleging that the relevant market was “premium natural/organic supermarkets” (“PNOS”). In that market, the merger ...
We treat the classical notion of convexity in the context of hard real analysis. Definitions of the concept are given in terms of defining functions and quadratic forms, and characterizations are provided of different concrete notions of convexity. This analytic notion of convexity is related to more classical geometric ideas. Applications are given both to analysis and geometry.
In this paper we evaluate applications of (return based) style analysis. The portfolio and positivity constraints imposed by style analysis are useful in constructing mimicking portfolios without short positions. Such mimicking portfolios can be used e.g. to construct efficient portfolios of mutual funds with desired factor loadings if the factor loadings in the underlying factor model are positively weighted portfolios. Under these conditions style analysis may also be used to determine a benchmark portfolio for performance measurement. Attribution of the returns on portfolios of which the actual composition is unobserved to specific asset classes on the basis of return based style analysis is attractive if moreover there are no additional cross exposures between the asset classes and if fund managers hold securities that on average h...
abstractIn this paper we evaluate applications of (return based) style analysis. The portfolio and positivity constraints imposed by style analysis are useful in constructing mimicking portfolios without short positions. Such mimicking portfolios can be used e.g. to construct efficient portfolios of mutual funds with desired factor loadings if the factor loadings in the underlying factor model are positively weighted portfolios. Under these conditions style analysis may also be used to determine a benchmark portfolio for performance measurement. Attribution of the returns on portfolios of which the actual composition is unobserved to specific asset classes on the basis of return based style analysis is attractive if moreover there are no additional cross exposures between the asset classes and if fund managers hold securities that on a...
Massive Online Analysis (MOA) is a software environment for implementing algorithms and running experiments for online learning from evolving data streams. MOA includes a collection of offline and online methods as well as tools for evaluation. In particular, it implements boosting, bagging, and Hoeffding Trees, all with and without Naïve Bayes classifiers at the leaves. MOA supports bi-directional interaction with WEKA, the Waikato Environment for Knowledge Analysis, and is released under the GNU GPL license.
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