13,151 research outputs found

    Dynamic State Tameness

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    An extension of the idea of state tameness is presented in a dynamic framework. The proposed model for financial markets is rich enough to provide analytical tools that are mostly obtained in models that arise as the solution of SDEs with deterministic coefficients. In the presented model the augmentation by a shadow stock of the price evolution has a Markovian character. As in a previous paper, the results obtained on valuation of European contingent claims and American contingent claims do not require the full range of the volatility matrix. Under some additional continuity conditions, the conceptual framework provided by the model makes it possible to regard the valuation of financial instruments of the European type as a particular case of valuation of instruments of American type. This provides a unifying framework for the problem of valuation of financial instruments.arbitrage; pricing of contingent claims; continuous-time financial markets; tameness; stochastic flows.

    State Tameness: A New Approach for Credit Constrains

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    We propose a new definition for tameness within the model of security prices as It\^o processes that is risk-aware. We give a new definition for arbitrage and characterize it. We then prove a theorem that can be seen as an extension of the second fundamental theorem of asset pricing, and a theorem for valuation of contingent claims of the American type. The valuation of European contingent claims and American contingent claims that we obtain does not require the full range of the volatility matrix. The technique used to prove the theorem on valuation of American contingent claims does not depend on the Doob-Meyer decomposition of super-martingales; its proof is constructive and suggest and alternative way to find approximations of stopping times that are close to optimal.arbitrage, pricing of contingent claims, continuous-time financial markets, tameness

    PARAMETRIC ESTIMATION OF DIFFUSION PROCESSES SAMPLED AT FIRST EXIT TIME

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    This paper introduces a family of recursively defined estimators of the parameters of a diffusion process. We use ideas of stochastic algorithms for the construction of the estimators. Asymptotic consistency of these estimators and asymptotic normality of an appropriate normalization are proved. The results are applied to two examples from the financial literature; viz., Cox-Ingersoll-Ross' model and the constant elasticity of variance (CEV) process illustrate the use of the technique proposed herein.Continuous time Markov processes, discrete time sampling, diffusions, interest rate models, stochastic algorithms.

    Maquinaria Pesada Para Movimiento De Tierras

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    En el campo de estas nuevas herramientas; las de mayor impacto han sido las mĆ”quinas para el movimiento de tierras y, en general, para la construcciĆ³n. Se han ingeniado mĆ”quinas avanzadas muy eficaces y econĆ³micas en sus costos de operaciĆ³n.PregradoTecnĆ³logo en Obras Civile

    Trade & Cap: A Customer-Managed, Market-Based System for Trading Bandwidth Allowances at a Shared Link

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    We propose Trade & Cap (T&C), an economics-inspired mechanism that incentivizes users to voluntarily coordinate their consumption of the bandwidth of a shared resource (e.g., a DSLAM link) so as to converge on what they perceive to be an equitable allocation, while ensuring efficient resource utilization. Under T&C, rather than acting as an arbiter, an Internet Service Provider (ISP) acts as an enforcer of what the community of rational users sharing the resource decides is a fair allocation of that resource. Our T&C mechanism proceeds in two phases. In the first, software agents acting on behalf of users engage in a strategic trading game in which each user agent selfishly chooses bandwidth slots to reserve in support of primary, interactive network usage activities. In the second phase, each user is allowed to acquire additional bandwidth slots in support of presumed open-ended need for fluid bandwidth, catering to secondary applications. The acquisition of this fluid bandwidth is subject to the remaining "buying power" of each user and by prevalent "market prices" ā€“ both of which are determined by the results of the trading phase and a desirable aggregate cap on link utilization. We present analytical results that establish the underpinnings of our T&C mechanism, including game-theoretic results pertaining to the trading phase, and pricing of fluid bandwidth allocation pertaining to the capping phase. Using real network traces, we present extensive experimental results that demonstrate the benefits of our scheme, which we also show to be practical by highlighting the salient features of an efficient implementation architecture.National Science Foundation (CCF-0820138, CSR-0720604, EFRI-0735974, CNS-0524477, and CNS-0520166); Universidad Pontificia Bolivariana and COLCIENCIASā€“Instituto Colombiano para el Desarrollo de la Ciencia y la TecnologĆ­a ā€œFrancisco Jose Ģ de Caldasā€

    Habilidades cognitivo lingĆ¼Ć­sticas de pensamiento social en estudiantes de la Escuela Pedro Emilio Gil a travĆ©s de la enseƱanza y aprendizaje del derecho de opiniĆ³n

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    La presente investigaciĆ³n que tuvo como objetivo interpretar las habilidades cognitivo lingĆ¼Ć­sticas de pensamiento social que emergen de una unidad didĆ”ctica respecto al derecho de opiniĆ³n en estudiantes del grado segundo. Se sitĆŗa dentro de la metodologĆ­a cualitativa, abierta, flexible y participante. Trata cuestiones relacionadas al derecho de opiniĆ³n como parte de la formaciĆ³n del pensamiento social. La estructura metodolĆ³gica que se desarrollo es el Estudio de Caso segĆŗn Stake (1999) y Yin (2009), dado que se busca obtener una comprensiĆ³n del objeto de estudio. El anĆ”lisis parte de la producciĆ³n de los estudiantes, se identifican, categorizan e interpretan las habilidades identificadas en la ejecuciĆ³n de la unidad didĆ”ctica, ademĆ”s se reflexiona la prĆ”ctica educativa contrastando la prĆ”ctica planeada y la realizada con la teorĆ­a. DespuĆ©s de ejecutar la unidad didĆ”ctica se identifican las habilidades de pensamiento social (descripciĆ³n, explicaciĆ³n, justificaciĆ³n, interpretaciĆ³n y argumentaciĆ³n) donde la descripciĆ³n fue la que se presento con mĆ”s recurrencia y la argumentaciĆ³n la que menos se presentĆ³. Palabras claves: enseƱanza de las ciencias sociales, pensamiento social, Habilidades cognitivo lingĆ¼Ć­sticas, prĆ”ctica reflexiv

    La didĆ”ctica del docente, factor influyente en la enseƱanza y el aprendizaje en ambientes virtuales: grupo 3 de pedagogĆ­a en la virtualidad del primer semestre 2013 de la Universidad TecnolĆ³gica de Pereira

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    El presente trabajo tuvo como propĆ³sito identificar la manera cĆ³mo influyĆ³ la didĆ”ctica de la docente en la enseƱanza y aprendizaje de los participantes del grupo 3 de la asignatura PedagogĆ­a en la virtualidad del primer semestre del 2013 de la Universidad TecnolĆ³gica de Pereira. Se tratĆ³ de un trabajo descriptivo e interpretativo basado en datos de naturaleza cualitativa, para lo cual se analizĆ³ la participaciĆ³n, la interacciĆ³n y la didĆ”ctica utilizada por la docente dentro de tres espacios de comunicaciĆ³n asincrĆ³nicos en la asignatura. Se utilizaron las siguientes tĆ©cnicas e instrumentos para obtener la informaciĆ³n: la observaciĆ³n no participante, una encuesta, dos entrevistas, una matriz para la didĆ”ctica, el Forograma para la interacciĆ³n y el Tifograma para la participaciĆ³n. Los resultados generales seƱalaron que la didĆ”ctica que utilizĆ³ la docente y sus relaciones comunicativas dentro de la asignatura, fueron la base para orientar los procesos de aprendizaje en los estudiantes y para desarrollar las metodologĆ­as pertinentes en cuanto a la enseƱanza. Esto se evidenciĆ³ al momento de analizar la participaciĆ³n y la interacciĆ³n dentro de los foros 2, 3 y 5 y al relacionarlos con el anĆ”lisis de la didĆ”ctica implementada por la docente.The present study had identify the form influenced of the teacherā€™s didactic in the teaching and learning of participants in group 3 of the subject PedagogĆ­a en la Virtualidad of the first semester of 2013 from the Universidad TecnolĆ³gica de Pereira. This work was descriptive and interpretative based on qualitative data, therefore was analyze the participation, the interaction and teacherā€™s didactic in three asynchronous communication spaces in the subject. Instruments and techniques used to obtain information were: not participant observation, a survey, two interviews, a matrix for teacherā€™s didactic, the Forograma for interaction and Tifograma for participation. The generals results indicated that the teacherā€™s didactic and her comunicatives relations used in the subject, was the base for guiding the learning process of students and to develop appropriate methodologies regarding teaching. These were evident when analyzing the participation and interaction in the forums 2, 3 and 5 and relate analysis teacherā€™s didactic implemented
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