Dinámica de sistemas para la selección de un sistema de pronóstico con base en el impacto de excesos y faltantes

This article studies the effect of the excesses and shortages in an organization, specifically in a product whose demand is growing. A system dynamics model was made through two diagrams two diagrams that are joined and related. In one of the diagrams is easy a sharing of forecast data, and in the main plot we can see the relations in the selection of a forecast with other components that are part of the organization. Based on all the relationships, we concluded about the impact of using three types of forecasts on finished goods inventory, safety stock, the level of service and the marginal utility of an organization.En el presente artículo se estudia el efecto de los excesos y faltantes en una organización, específicamente en un producto cuya demanda es creciente. Para facilitar el análisis, se realizó un modelo de dinámica de sistemas, compuesto de dos diagramas que posteriormente se relacionan. En uno de los diagramas se pueden intercambiar datos de los pronósticos, y en el diagrama principal se pueden observar las relaciones que tiene la selección de dicho pronóstico con otros aspectos que hacen parte de la organización. Su finalidad es conocer el impacto que genera el uso de tres tipos de pronósticos sobre el inventario de producto terminado, el inventario de seguridad, el nivel de servicio y la utilidad marginal de una organización

Dynamic equivalence between atomic and colloidal liquids

We show that the kinetic-theoretical self-diffusion coefficient of an atomic fluid plays the same role as the short-time self-diffusion coefficient D_S in a colloidal liquid, in the sense that the dynamic properties of the former, at times much longer than the mean free time, and properly scaled with D_S, will indistinguishable from those of a colloidal liquid with the same interaction potential. One important consequence of such dynamic equivalence is that the ratio D_L/ D_S of the long-time to the short-time self-diffusion coefficients must then be the same for both, an atomic and a colloidal system characterized by the same inter-particle interactions. This naturally extends to atomic fluids a well-known dynamic criterion for freezing of colloidal liquids[Phys. Rev. Lett. 70, 1557 (1993)]. We corroborate these predictions by comparing molecular and Brownian dynamics simulations on (soft- and hard-sphere) model systems, representative of what we may refer to as the "hard-sphere" dynamic universality class

Dinámica de sistemas para la selección de un sistema de pronóstico con base en el impacto de excesos y faltantes

This article studies the effect of the excesses and shortages in an organization, specifically in a product whose demand is growing. A system dynamics model was made through two diagrams two diagrams that are joined and related. In one of the diagrams is easy a sharing of forecast data, and in the main plot we can see the relations in the selection of a forecast with other components that are part of the organization. Based on all the relationships, we concluded about the impact of using three types of forecasts on finished goods inventory, safety stock, the level of service and the marginal utility of an organization.En el presente artículo se estudia el efecto de los excesos y faltantes en una organización, específicamente en un producto cuya demanda es creciente. Para facilitar el análisis, se realizó un modelo de dinámica de sistemas, compuesto de dos diagramas que posteriormente se relacionan. En uno de los diagramas se pueden intercambiar datos de los pronósticos, y en el diagrama principal se pueden observar las relaciones que tiene la selección de dicho pronóstico con otros aspectos que hacen parte de la organización. Su finalidad es conocer el impacto que genera el uso de tres tipos de pronósticos sobre el inventario de producto terminado, el inventario de seguridad, el nivel de servicio y la utilidad marginal de una organización

Search for resonant and nonresonant production of pairs of dijet resonances in proton-proton collisions at s \sqrt{s} = 13 TeV

A search for pairs of dijet resonances with the same mass is conducted in final states with at least four jets. Results are presented separately for the case where the four jet production proceeds via an intermediate resonant state and for nonresonant production. The search uses a data sample corresponding to an integrated luminosity of 138 fb$^{−1}$ collected by the CMS detector in proton-proton collisions at $\sqrt{s}$ = 13 TeV. Model-independent limits, at 95% confidence level, are reported on the production cross section of four-jet and dijet resonances. These first LHC limits on resonant pair production of dijet resonances via high mass intermediate states are applied to a signal model of diquarks that decay into pairs of vector-like quarks, excluding diquark masses below 7.6 TeV for a particular model scenario. There are two events in the tails of the distributions, each with a four-jet mass of 8 TeV and an average dijet mass of 2 TeV, resulting in local and global significances of 3.9 and 1.6 standard deviations, respectively, if interpreted as a signal. The nonresonant search excludes pair production of top squarks with masses between 0.50 TeV to 0.77 TeV, with the exception of a small interval between 0.52 and 0.58 TeV, for supersymmetric R-parity-violating decays to quark pairs, significantly extending previous limits. Here, the most significant excess above the predicted background occurs at an average dijet mass of 0.95 TeV, for which the local and global significances are 3.6 and 2.5 standard deviations, respectively.[graphic not available: see fulltext