19 research outputs found

    Estimating ensemble flows on a hidden Markov chain

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    We propose a new framework to estimate the evolution of an ensemble of indistinguishable agents on a hidden Markov chain using only aggregate output data. This work can be viewed as an extension of the recent developments in optimal mass transport and Schr\"odinger bridges to the finite state space hidden Markov chain setting. The flow of the ensemble is estimated by solving a maximum likelihood problem, which has a convex formulation at the infinite-particle limit, and we develop a fast numerical algorithm for it. We illustrate in two numerical examples how this framework can be used to track the flow of identical and indistinguishable dynamical systems.Comment: 8 pages, 4 figure

    Optimizaci贸n lineal heur铆stica aplicado a la log铆stica de transporte en la industria de dispositivos electr贸nicos

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    Online shopping, especially in the event of a pandemic, has forced the importation and therefore the transport of many products in the real world. Research in logistics has increased and one of the topics of greatest interest is the planning of logistics routes with minimization of costs. Although several previous studies have discussed some problems of classic routes, real logistical limitations such as vehicle capacity, number of vehicles available per day, storage, travel time on tertiary roads, etc. are not considered. This article presents the results of the research carried out within the framework of the development of a logistics distribution model for the department of Magdalena in the modality of land transport. The article presents a strategy to minimize the distribution costs of imported computers from the port of Santa Marta to the 29 municipalities of the Department. The principle of competition in the port market is analyzed and the interactive relationship between the port authority, the carrier and the conditions associated with delivery is studied. In accordance with the behavior of freight transport, optimization objectives are established. Under a simulation environment, the results of a model are presented where the cost of the service area is minimal, complying with the client's requirements within the technical and economic potential of the logistics service providers.Las compras on-line, especialmente en tiempos de pandemia, han obligado a importar y por ende, transportar una gran cantidad de mercanc铆as en el mundo real. Las investigaciones sobre log铆stica han incrementado y uno de los temas de mayor inter茅s es la planificaci贸n de rutas log铆sticas con minimizaci贸n de costos. Aunque varios estudios previos han discutido algunos problemas de rutas cl谩sicas, no se consideran limitaciones log铆sticas reales como la capacidad del veh铆culo, n煤mero de veh铆culos disponibles por d铆a, almacenamiento, tiempo de recorrido por v铆as terciarias, etc. En este trabajo se presenta el resultado de investigaci贸n llevado a cabo en el marco del desarrollo de un modelo de distribuci贸n log铆stica para el departamento del Magdalena en la modalidad de transporte terrestre. El art铆culo presenta una estrategia para minimizar costos de distribuci贸n de computadores importados desde el puerto de Santa Marta a los 29 municipios del Departamento. El principio de competencia en el mercado portuario es analizado y se estudia la relaci贸n interactiva entre la autoridad portuaria, el transportista y las condiciones asociadas a la entrega. De acuerdo con los comportamientos del transporte de mercanc铆as, se establecen los objetivos de optimizaci贸n. Bajo un entorno de simulaci贸n, se presentan los resultados de un modelo en donde el costo del 谩rea de servicio sea m铆nimo, cumpliendo con los requisitos del cliente dentro del potencial t茅cnico y econ贸mico de los proveedores de servicios log铆sticos
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