4 resultados
Resultados de la búsqueda
Mostrando 1 - 4 de 4
Ítem Working Capital Exposure: A Methodology to Control Economic Performance in Production Environment Projects(Production and Operations Management Society, 2010-05-07) Rivera Cadavid, LeonardoThis paper evaluates the performance of 16 different parametric, nonparametric and one semi-parametric specifications to calculate the Value at Risk (VaR) for the Colombian Exchange Market Index (IGBC). Using high frequency data (10-minute returns), we model the variance of the returns using GARCH and TGARCH models, that take in account the leverage effect, the day-of-the-week effect, and the hour-of-the-day effect. We estimate those models under two assumptions regarding returns’ behavior: Normal distribution and t distribution. This exercise is performed using two different ten-minute intraday samples: 2006-2007 and 2008-2009. For the first sample, we found that the best model is a TGARCH(1,1) without day-of the week or hour-of-the-day effects. For the 2008-2009 sample, we found that the model with the correct conditional VaR coverage would be the GARCH(1,1) with the day-of-the-week effect, and the hour-of-the-day effect. Both methods perform better under the t distribution assumption
Ítem Hacia una nueva métrica financiera basada en teoría de restricciones(Universidad Icesi, 2000-07-01T14:59:13Z) Manotas Duque, Diego Fernando; Rivera Cadavid, Leonardo; Manyoma Velásquez, Pablo CésarLa Ingeniería Industrial y la Administración de Empresas llevan buena parte de su historia intentando modelar el comportamiento de los sistemas que son su objeto de estudio, como son las organizaciones y los sistemas productivos. Sin embargo, estos modelos se han basado sobre todo en la descomposición de los sistemas en sus componentes y las relaciones entre ellos, para luego describir sus comportamientos en estados ideales, estableciendo reglas que los sistemas deberían obedecer. Estos modelos pueden denominarse normativos, en el sentido de que se les está indicando a los sistemas cómo deben funcionarÍtem Lean Manufacturing measurement : The relationships between Lean activities and Lean metrics(Universidad Icesi, 2007-10-01) Manotas Duque, Diego Fernando; Rivera Cadavid, LeonardoLean Manufacturing was developed by Toyota Motor company to address their specific needs in a restricted market in times of economic trouble. These concepts have been studied and proven to be transferrable and applicable to a wide variety of industries. This paper aims to integrate a set of metrics that have been proposed by different authors in such a way that they are consistent with the different stages and elements of Lean Manufacturing implementations. To achieve this, two frameworks for Lean implementations are presented and then the main factors for success are used as the basis to propose metrics that measure the advance in these factors. A tabular display of the impact of “Lean activities” on the metrics is presented, proposing that many a priori assumptions about the benefits on many different levels of improvement should be accurate. Finally, some ideas for future research and extension of the applications proposed on this paper are presented as closing points.Ítem Applying systems thinking and active learning strategies to a lean manufacturing program(Proceedings Of The 21st Annual Conference Of The Production And Operations Management Society, 2010-05-07) Rivera Cadavid, LeonardoLean Manufacturing seeks to eradicat e waste. This pursuit is conducted changing many pre-conceptions inherited fr om the mass production traditions. It is necessary to understand immediate and delayed impacts of the changes, as well as direct and indirect results of these changes. Th is systemic approach should enhance the learner’s understanding of the system (the manufacturing company) , its variables, its outcomes, and the relationships among the system’s components. This paper presents the process of designing a course to teach Lean Manufacturing to working professionals using systems thinking. This design proce ss is conducted for the development of job competencies and using Active Learning Strategies.