Saltar navegación e ir al contenido principal
Biblioteca digital de Bogotá
Logo BibloRed
Saltar el buscador

Esta ingresando al contenido principal

Colección institucional

Tesis y artículos académicos

En esta colección encontrarás los productos de investigación académica de beneficiarios de COLFUTURO y Fulbright, en diversas disciplinas, como arte, biología, administración e ingeniería.

  • Encuentra en esta colección
    • Otros
    • 1225 Tesis
    • 5 Audios
    • 820 Artículos
  • Creada el:
    • 15 de Julio de 2019
Logo Biblioteca Virtual Banco de la República
Creador Biblioteca Virtual Banco de la República
Imagen de apoyo de An ecological-economic model of the tropical dry forest on the Island of Bonaire = Un modelo económico ecológico del bosque seco tropical en la Isla de Bonaire

An ecological-economic model of the tropical dry forest on the Island of Bonaire = Un modelo económico ecológico del bosque seco tropical en la Isla de Bonaire

Por: Darío Gerardo Zambrano Cortés | Fecha: 2012

This paper presents the first ecological economic model of tropical dry forest on Bonaire Island. The model projects the economic benefits of the ecosystem services provided by the forest under two management alternatives: The baseline scenario assumes that the current short-term extractive practices continue for the following thirty years while the alternative scenarios includes the implementation of a birdwatching program, enhancement of agriculture, goat eradication and husbandry and reforestation program. The study reveals that the alternative scenario brings about $8.5 million more than the baseline scenario. Higher benefits could be obtained depending on the combination of the implemented programs though the implementation of the goat eradication and husbandry program together with the reforestation program is the most cost-efficient combination. The sensitivity analysis showed that doubling tourism doubles the economic benefits while reducing it in a half increases four times the economic benefits. In the other hand, the analysis showed that grazing by goats and other roamers costs about $4 million to the island; it is necessary to reduce the grazing to 70% of the current state in order to have benefits and goats at the same time. The research also estimates the value of seed dispersal and pollination on the Bonairean forest in $ 17 million.
  • Temas:
  • Otros
  • Ciencias sociales

Compartir este contenido

An ecological-economic model of the tropical dry forest on the Island of Bonaire = Un modelo económico ecológico del bosque seco tropical en la Isla de Bonaire

Copia el enlace o compártelo en redes sociales

Imagen de apoyo de Identificación y evaluación de amenazas a la seguridad de infraestructuras de transporte y distribución de electricidad

Identificación y evaluación de amenazas a la seguridad de infraestructuras de transporte y distribución de electricidad

Por: Gabriel Jaime Correa Henao | Fecha: 2012

El tema de aseguramiento del suministro energético, especialmente en lo concerniente a la protección de las infraestructuras energéticas, ha suscitado especial interés en los países de la OCDE en los últimos años. Al respecto, el Consejo de la Unión Europea ha aprobado la Directiva 2008/114/CE (sobre la identificación y designación de infraestructuras críticas europeas) y el Departamento de Seguridad Nacional de EE.UU ha publicado el NIPP en 2009 (National Infrastructure Protection Plan). Dichos planes contemplan el establecimiento de procedimientos para la protección y seguridad de las infraestructuras críticas, en el marco de estrategias de gestión de riesgos. A partir de los conceptos establecidos en ambos programas, en esta tesis se presentan propuestas metodológicas aplicables a la identificación de riesgos y a la evaluación de amenazas en la red de infraestructura eléctrica. Se propone el uso de mapas interconectados de riesgos, complementados con la determinación de componentes de riesgo en el sistema de infraestructura. Así mismo, se propone el uso de las cartas de riesgos, mediante las cuales se obtiene una representación gráfica e intuitiva de la evaluación semicuantitativa de los riesgos más relevantes. Por otro lado, se formulan y validan estrategias metodológicas para la evaluación de la vulnerabilidad estructural en redes de transporte de alta tensión, a partir de la combinación de modelos de flujos de carga y medidas de grafos de libre-escala. De esta manera, es posible estudiar los escenarios de riesgos en función de los eventos que pueden desencadenar fallos en cascada dentro de un sistema eléctrico de potencia. Se demuestra la utilidad de las técnicas de teoría de grafos para analizar las respuestas de los sistemas eléctricos de potencia y evaluar la vulnerabilidad de las redes de transporte. Un ejemplo de dicha evaluación se desarrolla mediante valoración de la tolerancia de redes de prueba IEEE contra fallos aleatorios y contra ataques deliberados. Adicionalmente, se ha realizado una aplicación de la propuesta metodológica para evaluación de vulnerabilidad en los sistemas eléctricos de alta tensión en Colombia y España. Como resultado, los trabajos desarrollados en la tesis aportan nuevos instrumentos para la gestión de riesgos en infraestructuras eléctricas, en particular en redes de transporte en alta tensión.
  • Temas:
  • Otros
  • Ingeniería

Compartir este contenido

Identificación y evaluación de amenazas a la seguridad de infraestructuras de transporte y distribución de electricidad

Copia el enlace o compártelo en redes sociales

Imagen de apoyo de Option-implied volatility and credit announcements: an event study approach = La volatilidad implícita en opciones y anuncios de crédito: estimacion via estudio de eventos

Option-implied volatility and credit announcements: an event study approach = La volatilidad implícita en opciones y anuncios de crédito: estimacion via estudio de eventos

Por: Nicolás Salamanca Acosta | Fecha: 2009

The aim of this paper was to measure the effect of different credit-related events on the option implied volatility of several companies that belong to the Dow Jones Euro Stoxx 50 index list. Measuring the effect of credit events on volatility will augment on the already important body of literature that investigates the volatility-related phenomena; in particular those who research the effect of news on volatility. I find that, over the entire window around the credit events, there was a decrease in the implied volatility but that only the negative events have a statistically significant effect, which reflects the stronger information content of negative credit events researched by previous papers. I also found that this negative effect is mainly due to a strong “reversal” effect in the post-event 10-day period, where the negative effect is stronger and more statistically significant (particularly for the negative events). Furthermore, during the pre-event period there is not much evidence that supports any type of foresight of the market. My results also suggest that there is a difference between the behavior of the implied volatility when the events are outlook changes and credit reviews, and when the event is a rating change (downgrade/upgrade).
  • Temas:
  • Otros
  • Economía

Compartir este contenido

Option-implied volatility and credit announcements: an event study approach = La volatilidad implícita en opciones y anuncios de crédito: estimacion via estudio de eventos

Copia el enlace o compártelo en redes sociales

Imagen de apoyo de General bounds for arithmetic asian option price = Límites generales para los precios de las opciones asiáticas aritméticas

General bounds for arithmetic asian option price = Límites generales para los precios de las opciones asiáticas aritméticas

Por: Santiago Stozitzky Otálora | Fecha: 2013

This dissertation explains in detail how Albrecher et al. (2008) developed three different model independent lower bounds and one upper comonotonic bound for European Asian call option prices. The main characteristic of these bounds is that Albrecher et al. (2008) only use the observable plain vanilla option prices in the market to calculate them whichallows for the _nding of static hedging portfolios. The concepts behind the bounds are basically Jensen's inequality and some properties of comonotonicity of random vectors. This document will also explain how to implement these bounds when the market has a finite number of options available, moreover, how to do it when these bounds do not involve strikes found in the market. Two facts will be used: the call option price function is convex with respect to strike, and the lower and upper bounds for a call option suggested by Bertsimas and Popescu (2002). Finally, as an example, one application of these bounds in the Colombian FX option market will be presented.
  • Temas:
  • Otros
  • Economía

Compartir este contenido

General bounds for arithmetic asian option price = Límites generales para los precios de las opciones asiáticas aritméticas

Copia el enlace o compártelo en redes sociales

Imagen de apoyo de Policy Recommendations To Foster The Development Of The Vegetables Supply Chain In An Agrarian District = Recomendaciones de Políticas para Impulsar el Desarrollo de un Clúster Agrícola en un Distrito Agrario en Antioquia

Policy Recommendations To Foster The Development Of The Vegetables Supply Chain In An Agrarian District = Recomendaciones de Políticas para Impulsar el Desarrollo de un Clúster Agrícola en un Distrito Agrario en Antioquia

Por: Yúber Andrés Romero Aristizábal | Fecha: 2009

Oriente Antioqueño is an important region within Antioquia. There, the production of vegetables represents an important element of the economy, with approximately 12,000 farmers cultivating vegetables in four municipalities. There, farmers have inadequate training in agricultural practices, they lack adequate instruction on how to use fertilizers and pesticides, and also they do not have the appropriate instruments, among many other technological pitfalls. This situation leads to high levels of crops losses, higher costs of production, and sometimes, noncompliance with phytosanitary standards and environmental damage. In order to solve the problem this thesis analysis the outcome from central policies and covers the analysis of two international cases (in Brazil and Nicaragua) looking for new strategies to foster competitiveness in the production of vegetables.I identified four policy options: (1) maintaining the status quo, (2) increasing municipal revenues and restructuring UMATAs, (3) upgrading Law 811, and (4) implementing a cluster development program. The first alternative assesses the implications of letting the market operate under current conditions. Policy alternatives 2 and 3 evaluate the benefits from restructuring agricultural extension offices and the agreements of competitiveness. Finally, implementing a cluster development program explores the gains from creating a local strategy to generate an enabling environment in the production of vegetables. After evaluating the policy options using the criteria of political feasibility, administrative feasibility, effectiveness, efficiency, and equity, I recommend implementing a cluster development program. This option is likely to generate higher benefits as it counteracts problems in the supply and the demand side of the vegetables supply chain. Moreover, as a program implemented at the local level by local institutions, it promises better results.
  • Temas:
  • Otros
  • Ciencias sociales

Compartir este contenido

Policy Recommendations To Foster The Development Of The Vegetables Supply Chain In An Agrarian District = Recomendaciones de Políticas para Impulsar el Desarrollo de un Clúster Agrícola en un Distrito Agrario en Antioquia

Copia el enlace o compártelo en redes sociales

Compartir este contenido

Mobiliari - 19/11/14

Copia el enlace o compártelo en redes sociales

Imagen de apoyo de Systematic staging design of fixed-bed methanol synthesis reactor = Diseño sistemático y a etapas del reactor de síntesis de metanol a lecho fijo

Systematic staging design of fixed-bed methanol synthesis reactor = Diseño sistemático y a etapas del reactor de síntesis de metanol a lecho fijo

Por: Andrés Ricardo León Garzón | Fecha: 2013

The thesis work deals with the techno-economical assessment of the reactor network for methanol synthesis and direct dimethyl ether synthesis from the energy-process integration viewpoint. The reactor network is composed by a water-cooled reactor; a gas-cooled reactor used to preheat the syngas fed to the network; a separation section and a recycle loop. This general configuration is often reduced to the study of the sole water-cooled reactor in literature works. Although such reactor is the key-element of the overall system, the other parts of the process cannot be anymore neglected when the techno-economical assessment is the target of reactor design. Therefore, the so-called systematic staging design methodology proposed by Hillestad, 2010 is adopted to redefine the optimal ratio between the different stages of methanol synthesis reactor network. To do so, the phenomenological mathematical model of the overall system is required together with the solution of the resulting set of ordinary differential equations coupled with algebraic constraints and initial and boundary conditions as well. It means that beyond the cumbersome issues of mathematical modeling to properly characterize the heterogeneous reactors for methanol and dimethyl ether synthesis, a boundary value problem has to be solved iteratively within an optimization procedure. According to what has been described, the model is then implemented into a multivariable, nonlinear optimization routine in order to maximize not only the methanol and/or dimethyl ether production but also the steam generation. It is demonstrated that a revision of the traditional design based on the systematic staging design for the integrated optimization of energy and process yield can increase the net operating margin of a medium size methanol synthesis plant by about 2 M€/y.
  • Temas:
  • Otros

Compartir este contenido

Systematic staging design of fixed-bed methanol synthesis reactor = Diseño sistemático y a etapas del reactor de síntesis de metanol a lecho fijo

Copia el enlace o compártelo en redes sociales

Compartir este contenido

Cromos - 18/11/14

Copia el enlace o compártelo en redes sociales

Imagen de apoyo de Context Management and Self-Adaptivity for Situation-Aware Smart Software Systems = Administración de Contexto y Auto-Adaptación para Sistemas de Software Inteligentes y Sensibles a las Situaciones

Context Management and Self-Adaptivity for Situation-Aware Smart Software Systems = Administración de Contexto y Auto-Adaptación para Sistemas de Software Inteligentes y Sensibles a las Situaciones

Por: Norha Milena Villegas Machado | Fecha: 2013

Our society is increasingly demanding situation-aware smarter software (SASS) systems, whose goals change over time and depend on context situations. A system with such properties must sense their dynamic environment and respond to changes quickly, accurately, and reliably, that is, to be context-aware and self-adaptive. The problem addressed in this dissertation is the dynamic management of context information to improve the relevance of SASS systems' context-aware capabilities with respect to changes in their requirements and execution environment. Therefore, this dissertation focuses on the investigation of dynamic context management and self-adaptivity to: (i) improve context-awareness and exploit context information to enhance quality of user experience in SASS systems, and (ii) improve the dynamic capabilities of self-adaptivity in SASS systems. Context-awareness and self-adaptivity pose significant challenges for the engineering of SASS systems. Regarding context-awareness, the first challenge addressed is the impossibility of fully specifying environmental entities and the corresponding monitoring requirements at design-time. The second challenge arises from the continuous evolution of monitoring requirements due to changes in the system caused by self-adaptation. As a result, context monitoring strategies must be modeled and managed in such a way that they support the addition and deletion of context types and monitoring conditions at runtime. Concerning self-adaptivity, the third challenge is to control the dynamicity of adaptation goals, adaptation mechanisms, and monitoring infrastructures, and the way they affect each other in the adaptation process. This is to preserve the effectiveness of context monitoring requirements and thus self-adaptation. The fourth challenge, related also to self-adaptivity concerns the assessment of adaptation mechanisms at runtime to prevent undesirable system states as a result of self-adaptation.
  • Temas:
  • Otros
  • Ingeniería

Compartir este contenido

Context Management and Self-Adaptivity for Situation-Aware Smart Software Systems = Administración de Contexto y Auto-Adaptación para Sistemas de Software Inteligentes y Sensibles a las Situaciones

Copia el enlace o compártelo en redes sociales

Compartir este contenido

Dinero - 14/11/14

Copia el enlace o compártelo en redes sociales

Selecciona las Colecciones en las que vas a añadir el contenido

Para consultar los contenidos añadidos busca la opción Tus colecciones en el menú principal o en Mi perfil.

Mis colecciones

Cargando colecciones
Se abrirá en una nueva pestaña