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Search Results: 1 - 10 of 20048 matches for " Ricardo Mansilla Corona "
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Algorithmic Complexity in Minority Game
Ricardo Mansilla Corona
Physics , 1999,
Abstract: In this paper we introduce a new approach for the study of the complex behavior of Minority Game using the tools of algorithmic complexity, physical entropy and information theory. We show that physical complexity and mutual information function strongly depend on memory size of the agents and yields more information about the complex features of the stream of binary outcomes of the game than volatility itself.
From naive to sophisticated behavior in multiagents based financial market models
Ricardo Mansilla
Physics , 2000, DOI: 10.1016/S0378-4371(00)00227-2
Abstract: We discuss the behavior of two magnitudes, physical complexity and mutual information function of the outcome of a model of heterogeneous, inductive rational agents inspired in the El Farol Bar problem and the Minority Game. The first is a measure rooted in Kolmogorov-Chaitin theory and the second one a measure related with information entropy of Shannon. We make extensive computer simulations, as result of which, we propose an ansatz for physical complexity and establish the dependence of exponent of that ansatz from the parameters of the model. We discuss the accuracy of our results and the relationship with the behavior of mutual information function as a measure of time correlations of agents choice.
Algorithmic Complexity of Real Financial Markets
Ricardo Mansilla
Physics , 2000, DOI: 10.1016/S0378-4371(01)00434-4
Abstract: A new approach to the understanding of the complex behavior of financial markets index using tools from thermodynamics and statistical physics is developed. Physical complexity, a magnitude rooted in the Kolmogorov-Chaitin theory is applied to binary sequences built up from real time series of financial markets indices. The study is based on NASDAQ and Mexican IPC data. Different behaviors of this magnitude are shown when applied to the intervals of series placed before crashes and in intervals when no financial turbulence is observed. The connection between our results and The Efficient Market Hypothesis is discussed.
Alberto Arias Duval: su fallecimiento
Ricardo E. Corona
Revista Argentina de Radiología , 2008,
Abstract:
Deterministic site exchange cellular automata model for the spread of diseases in human settlements
Ricardo Mansilla,Jose L. Gutierrez
Physics , 2000,
Abstract: A cellular automata model that describes as limit cases of his parameters the spread of contagious diseases modeled by systems of ordinary or partial differential equations is developed. Periodic features of the behavior of human settlement are considered. The model is built taking into account the range of motion of the elements of population. For small (large) values of this range, the behaviors described by partial (ordinary) differential equation models are reproduced. Emphasis is done in the study of those scenarios in which the above mentioned equations fail to describe. Some interesting results in these cases are reported.
Cambio climático global en el contexto de la ecorregión subantártica de Magallanes y la reserva de biósfera Cabo de Hornos
Mansilla,Andrés; Ojeda,Jaime; Rozzi,Ricardo;
Anales del Instituto de la Patagonia , 2012, DOI: 10.4067/S0718-686X2012000100008
Abstract: the consequences and causes of global climate change are not homogeneous in the diverse regions of the planet, and its impacts are not only ecological, but also economic, political, and ethical. in this context, the sub-antarctic magellanic ecoregion and the ethical dimensions represent two aspects that require more attention from the scientific community. the frst has biological and cultural singularities that contrast with subpolar regions of the northern hemisphere, and need to be given greater consideration to effectively confront the challenges of global environmental change. the second requires more in depth studies for at least two reasons: a) the ultimate causes of global climate change derive from the type of relationship established by industrial society with the natural world, a type of relationship that has become increasingly prevailing since the mid-20th century; b) the question about we should act in the face of global change involves ethical questions. in this context, the international colloquium on global climate change in the region of magallanes and antarctica: evidences and future challenges, organized by the university of magallanes and chilean antarctic institute in october 2009, opens new opportunities for long-term socio-ecological research and monitoring of global environmental change at a planetary scale. to contribute to the consolidation n of these initiatives we concisely present the main attributes of magellanic sub-antarctic ecoregion, and of the sub-antarctic biocultural conservation pro-gram coordinated by umag, the institute of ecology and biodiversity and the university of north texas, which integrates ecological and ethical dimensions in the analyses of socio-ecological processes at local, regional, national, and international scales.
Cambio climático global en el contexto de la ecorregión subantártica de Magallanes y la reserva de biósfera Cabo de Hornos Global climate change in the eco-region subantarctic of Magellan and the Cape Horn Biosphere reserve
Andrés Mansilla,Jaime Ojeda,Ricardo Rozzi
Anales del Instituto de la Patagonia , 2012,
Abstract: El cambio climático global no tiene consecuencias ni causas homogéneas en las diversas regiones del planeta, y sus consecuencias no son sólo ecológicas, sino también económicas, políticas y éticas. En este contexto global, la ecorregión subantártica de Magallanes y la dimensión ética representan dos aspectos que requieren mayor consideración por la comunidad científica. La primera posee singularidades biológicas y culturales que contrastan con zonas subpolares del Hemisferio Norte y deben ser examinadas con mayor atención respecto a su valor para confrontar los desafíos del cambio global ambiental. La segunda requiere un examen detallado por al menos dos razones: a) las causas últimas del cambio climático global radican en un modo de relación establecido por la sociedad industrial con el mundo natural, que se ha globalizado y radicalizado a partir de mediados del siglo XX; b) la pregunta de cómo debemos actuar frente al cambio medioambiental global involucra decisiones éticas. En este marco de singularidades el "Coloquio Internacional de Cambio Climático en la Región de Magallanes y Antártica: Evidencia y Desafíos para el Futuro" organizado por la Universidad de Magallanes (UMAG) y el Instituto Antártico Chileno, en octubre 2009, abre nuevas oportunidades para la investigación socio-ecológica a largo plazo y el monitoreo del cambio ambiental global a escala planetaria. Con el fin de contribuir a la consolidación de estas iniciativas presentamos concisamente los atributos de la ecorregión subantártica de Magallanes y del programa de Conservación Biocultural Subantártica, coordinado por UMAG, el Instituto de Ecología y Biodiversidad y la Universidad de North Texas, que integra dimensiones ecológicas y éticas en los análisis de procesos socio-ecológicos a escalas locales, regionales, nacionales e internacionales. The consequences and causes of global climate change are not homogeneous in the diverse regions of the planet, and its impacts are not only ecological, but also economic, political, and ethical. In this context, the sub-Antarctic Magellanic ecoregion and the ethical dimensions represent two aspects that require more attention from the scientific community. The frst has biological and cultural singularities that contrast with subpolar regions of the Northern Hemisphere, and need to be given greater consideration to effectively confront the challenges of global environmental change. The second requires more in depth studies for at least two reasons: a) the ultimate causes of global climate change derive from the type of relationship established by in
VARIACIONES ANATOMICAS DE LAS VENAS COMUNICANTES DE LA REGION POSTERIOR DE LA PIERNA Y SU IMPORTANCIA CLINICA
Canessa,César E.; González,Daniel; Mansilla,Ricardo;
Revista chilena de anatomía , 1999, DOI: 10.4067/S0716-98681999000100001
Abstract: summary:the present research was undertaken in order to identify anatomical factor to link the variable clinical and hemodynamic consequences of the incompetent communicating veins of the leg. the study was done by dissection in 100 lower limbs of 58 adult people of both sexes. it was found a main communicating vein in 92% of legs with variable anastomosis pattern between the superficial veins and the deep venous system, and receiving thick muscles branches in 12%. this variation could bias the reflux degree of incompetent veins and its transmission, but its signification requires clinical assessment.
VARIACIONES ANATOMICAS DE LAS VENAS COMUNICANTES DE LA REGION POSTERIOR DE LA PIERNA Y SU IMPORTANCIA CLINICA ANATOMICAL VARIATIONS OF THE POSTERIOR COMMUNICATING VEINS OF THE LEG AND ITS CLINICAL IMPORTANCE
César E. Canessa,Daniel González,Ricardo Mansilla
Revista chilena de anatomía , 1999,
Abstract: RESUMEN:Con el objetivo de identificar factores anatómicos vinculables a las variables significaciones hemodinámica y clínica de las venas comunicantes incompetentes de la pierna , se estudiaron mediante disección cadavérica, un total de 100 miembros inferiores. En el 91% se halló una comunicante principal, que presentaba patrones de anastomosis variables entre los colectores superficiales y el sistema profundo, y que recibía en un 12% de los casos, gruesas colaterales musculares subfasciales. En caso de incompetencia valvular, es probable que estas variaciones anatómicas puedan incidir en la transmisión y magnitud del reflujo, debiendo determinarse su significación en estudios clínicos. SUMMARY:The present research was undertaken in order to identify anatomical factor to link the variable clinical and hemodynamic consequences of the incompetent communicating veins of the leg. The study was done by dissection in 100 lower limbs of 58 adult people of both sexes. It was found a main communicating vein in 92% of legs with variable anastomosis pattern between the superficial veins and the deep venous system, and receiving thick muscles branches in 12%. This variation could bias the reflux degree of incompetent veins and its transmission, but its signification requires clinical assessment.
On the scaling of the distribution of daily price fluctuations in Mexican financial market index
Lester Alfonso,Ricardo Mansilla,Cesar A. Terrero-Escalante
Quantitative Finance , 2011, DOI: 10.1016/j.physa.2012.01.023
Abstract: In this paper, a statistical analysis of log-return fluctuations of the IPC, the Mexican Stock Market Index is presented. A sample of daily data covering the period from $04/09/2000-04/09/2010$ was analyzed, and fitted to different distributions. Tests of the goodness of fit were performed in order to quantitatively asses the quality of the estimation. Special attention was paid to the impact of the size of the sample on the estimated decay of the distributions tail. In this study a forceful rejection of normality was obtained. On the other hand, the null hypothesis that the log-fluctuations are fitted to a $\alpha$-stable L\'evy distribution cannot be rejected at 5% significance level.
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