Noticias en español
Seminars appear in decreasing order in relation to date. To find an activity of your interest just go down on the list. Normally seminars are given in English. If not, they will be marked as Spanish Only.
Stochastic dynamic programming applied to microgrid management
Abstract: Energy Management Systems (EMS) are usually based on the integer programming framework. A novel method based on stochastic control and dynamic programming is proposed. It allows for a precise modeling of complex constraints such as the minimal working power of a diesel motor. The EMS proposed here is based on a rolling horizon strategy. It takes into account historical data and randomness as well as the aging of the battery and the motor working constraints. A semi-lagrangian scheme was implemented within BOCOP – a...
The role of gestures in mathematical discourse
Abstract This seminar focuses on the fluid and embodied nature of gestures in a bilingual (English and Farsi) mathematics classroom. It examines the symbiotic nature of gestures and their accompanying speech, both temporally and semantically. Particular attention will be given to how gestures function as amplifiers to what interlocutors verbally express. Furthermore, the cross-linguistic variation of gestures will be discussed.
On the diameter of minimal separators in a graph
Abstract: The so-called topological and metric tree-likeness invariants are two distinct approaches to measure “how close” a graph is from a tree. They are related with tree-decompositions of the graph. In this work, we focus on the relations between topological and metric graph parameters, and especially between treewidth and treelength. Our main contribution is a general upper-bound on the diameter of minimal separators in a graph that depends on the properties of its cycle basis. This allows us to show the treelength is...
Seminarios Problemas Inversos y de Control (UCh-PUC-USM-USACH)
1.- Nicole Spillane Postdoc Conicyt-DIM/CMM PhD U. Paris 6 2014 Achieving Robustness in Domain Decomposition Algorithms Domain decomposition methods are a family of algorithms which allow to solve large scale problems on parallel architectures. I will introduce the main idea behind domain decomposition which is to approximate the solution of a very large problem using solutions to smaller problems and illustrate it by presenting some of the popular domain decomposition methods (Schwarz, BDD, FETI). Although the field is already quite...
Optimizing the first nonzero Neumann eigenvalue on the cylinder
Abstract: In this talk, we will discuss the characterization of do- mains maximizing the first non-zero Neuman eivgenvalue on a general cylinder. We will also present our study of overdeter- mined problem which arises from the Hadamard formula for this eigenvalue. A joint work with Tobias Weth.
CAMBIO DEL PROFESOR Y RESOLUCIÓN DE PROBLEMAS DE FINAL ABIERTO
Abstract El foco de este trabajo se centra en comprender el cambio del profesor desde su propia perspectiva en torno a la resolución de problemas. Para estudiar el cambio del profesor, es necesario considerarla como un proceso interno y externo, que implica el sistema de creencias y actitudes y cambios a nivel cognitivo. Por lo anterior, y mediante el uso de entrevistas utilizando viñetas como herramienta metodológica, se trabajó en la identificación de elementos que favorecen el cambio en el sistema de creencias y la forma de...
Charla Observatorio Vulcanológico
En esta presentación se dará a conocer la Red Nacional de Vigilancia Volcánica, dependiente del Servicio Nacional de Geología y Minería, su mision, objetivos y alcances. Se repasará brevemente su historia desde su formación como Observatorio, hasta el dia de hoy. Se hará mención a los equipamientos y tecnologías utilizadas. Se presentará además la estructura del Observatorio, dando a conocer sus áreas, principalmente las áreas de sismología, desarrollo y sensores remotos.
Collap transition of a self-interacting partially directed random walk.
Abstract: We investigate the 1 + 1 dimensional self-interacting and partially directed self-avoiding walk, usually referred to by the acronym IPDSAW. The IPDSAW is known to undergo a extended-collapsed transition at a critical point \beta_c. We present here a new method that provides a probabilistic representation of the partition function, from which we derive a variational formula for the free energy. This variational formula allows us to prove the existence of the collapse transition and to identify the critical point in a simple way. We...
Dynamical Cubes and a criteria for systems having product extensions
For a minimal$ Z^2-$topological dynamical systems, we introduce a cube structure and a generalization of the regionally proximal relation, which allow us to characterize product systems and their factors. We also introduce the concept of topological magic systems, which is the topological counterpart of measure theoretic magic systems introduced by Host in his study of multiple averages for commuting transformations. We give various applications of these structures, including the construction of some special factors in topological dynamics,...
Desarrollo de Recursos Didácticos y Formación Permanente de Profesores: Un Abordaje Integral
Abstract El Proyecto Klein es una iniciativa internacional de la ICMI (International Commission on Mathematical Instruction), con el propósito de producir recursos didácticos en diversos medios y en varios idiomas. La concepción de los materiales desarrollados está inspirada por las ideas de Félix Klein sobre enseñanza de matemática y formación de profesores, especialmente: (1) la brecha entre el contenido matemático en la formación inicial de profesores y la sala de aula (reconocida por el autor como una doble discontinuidad); (2) la...
