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Search Results: 1 - 10 of 5952 matches for " Xavier Castelló "
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Consensus and ordering in language dynamics
Xavier Castelló,Andrea Baronchelli,Vittorio Loreto
Physics , 2009, DOI: 10.1140/epjb/e2009-00284-2
Abstract: We consider two social consensus models, the AB-model and the Naming Game restricted to two conventions, which describe a population of interacting agents that can be in either of two equivalent states (A or B) or in a third mixed (AB) state. Proposed in the context of language competition and emergence, the AB state was associated with bilingualism and synonymy respectively. We show that the two models are equivalent in the mean field approximation, though the differences at the microscopic level have non-trivial consequences. To point them out, we investigate an extension of these dynamics in which confidence/trust is considered, focusing on the case of an underlying fully connected graph, and we show that the consensus-polarization phase transition taking place in the Naming Game is not observed in the AB model. We then consider the interface motion in regular lattices. Qualitatively, both models show the same behavior: a diffusive interface motion in a one-dimensional lattice, and a curvature driven dynamics with diffusing stripe-like metastable states in a two-dimensional one. However, in comparison to the Naming Game, the AB-model dynamics is shown to slow down the diffusion of such configurations.
Ordering dynamics with two non-excluding options: Bilingualism in language competition
Xavier Castelló,Víctor M. Eguíluz,Maxi San Miguel
Physics , 2006, DOI: 10.1088/1367-2630/8/12/308
Abstract: We consider a modification of the voter model in which a set of interacting elements (agents) can be in either of two equivalent states (A or B) or in a third additional mixed AB state. The model is motivated by studies of language competition dynamics, where the AB state is associated with bilingualism. We study the ordering process and associated interface and coarsening dynamics in regular lattices and small world networks. Agents in the AB state define the interfaces, changing the interfacial noise driven coarsening of the voter model to curvature driven coarsening. We argue that this change in the coarsening mechanism is generic for perturbations of the voter model dynamics. When interaction is through a small world network the AB agents restore coarsening, eliminating the metastable states of the voter model. The time to reach the absorbing state scales with system size as $\tau \sim \ln N$ to be compared with the result $\tau \sim N$ for the voter model in a small world network.
Viability and Resilience of Languages in Competition
Laetitia Chapel,Xavier Castelló,Claire Bernard,Guillaume Deffuant,Víctor M. Eguíluz,Sophie Martin,Maxi San Miguel
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0008681
Abstract: We study the viability and resilience of languages, using a simple dynamical model of two languages in competition. Assuming that public action can modify the prestige of a language in order to avoid language extinction, we analyze two cases: (i) the prestige can only take two values, (ii) it can take any value but its change at each time step is bounded. In both cases, we determine the viability kernel, that is, the set of states for which there exists an action policy maintaining the coexistence of the two languages, and we define such policies. We also study the resilience of the languages and identify configurations from where the system can return to the viability kernel (finite resilience), or where one of the languages is lead to disappear (zero resilience). Within our current framework, the maintenance of a bilingual society is shown to be possible by introducing the prestige of a language as a control variable.
De la investigación sobre el proceso de composición a la ense?anza de la escritura
Castelló,Montserrat;
Revista signos , 2002, DOI: 10.4067/S0718-09342002005100011
Abstract: in the last twenty years, research on writing has changed from focusing almost exclusively on a cognitive analysis of the writing process to inquiring into the possibility and the need to teach this process (camps & castelló, 1996). this change in perspective has been gradual but definite, which has currently allowed teachers to have a knowledge corpus available in education. this, in turn, feeds new research and new ways to interpret the writing process. in this paper, our aim will be to analyze the main changes in the way how the writing process has been conceived during the last years and in the challenges these conceptions pose the teaching of writing.
Accessibility to university museums: A strategical objective
Edmon Castell
University Museums and Collections Journal , 2009,
Abstract: In the National University of Colombia there are currently 25 museums and collections including art, medicine, natural science, anthropology and history. Taken together, they comprise the largest, most diverse and most important museum in Colombia, and also the least known. The collections are the product of the conservation and research work of the university in the 141 years of its existence. In recent years, the National University of Colombia has not only become more aware of the importance of its cultural and scientific heritage, but also of the marginality of the work in the university museums. For that reason, in 2006 the university began to work on a Museums and Cultural Heritage Project to develop policies for the conservation, acquisition, documentation, research and communication of its own cultural heritage. The National University of Colombia hopes, through the development of a stronger, structured, ethical, responsible, efficient and representative project about Museums and Cultural Heritage to be better prepared for current challenges. In addition, the project hopes to generate a new landscape of accessibility to the museums and collections of the National University of Colombia. In short, the Museums and Cultural Heritage System of the National University of Colombia, through a ‘Museums portal’ located in a colonial building in Bogotá known as Claustro de San Agustín (Cloister of St. Augustine) seeks to highlight the cultural heritage of the university, and become, beyond the classrooms and research centers of the campus, an important reference for the meeting of teachers, students, citizens and other cultural and academic institutions.
El tractament de les construccions amb verb suport en els diccionaris monolingües i bilingües de l'alemany i el català [The treatment of support-verb constructions in monolingual and bilingual German and Catalan dictionaries]
Castell, Andreu
Zeitschrift für Katalanistik , 2011,
Abstract: Taking as a starting point a corpus based on the most representative grammars of the German language, the aim of this paper is to analyze the treatment of support verb constructions in monolingual and bilingual dictionaries of German and Catalan. More specifically, the analysis will focus on the number of support verb constructions in the corpus that appear in these dictionaries and how they are then represented in the entries dedicated to both the participating verbs and nouns.
De la investigación sobre el proceso de composición a la ense anza de la escritura
Montserrat Castelló
Revista Signos , 2002,
Abstract: En los últimos veinte a os la investigación sobre escritura ha pasado de centrarse casi exclusivamente en el análisis cognitivo del proceso de composición a preguntarse por la posibilidad y la necesidad de ense anza de este proceso (Camps y Castelló, 1996). El cambio de perspectiva ha sido gradual pero decidido y ello ha permitido que en la actualidad se disponga de un cierto corpus de conocimientos útiles para el ámbito educativo que, a su vez, alimentan nuevas investigaciones y nuevas formas de interpretar el proceso de composición. En este artículo nos centraremos en analizar los principales cambios que en los últimos a os han acaecido en la manera de concebir el proceso de composición y en los retos que esta concepción plantea a la ense anza de la escritura. In the last twenty years, research on writing has changed from focusing almost exclusively on a cognitive analysis of the writing process to inquiring into the possibility and the need to teach this process (Camps & Castelló, 1996). This change in perspective has been gradual but definite, which has currently allowed teachers to have a knowledge corpus available in education. This, in turn, feeds new research and new ways to interpret the writing process. In this paper, our aim will be to analyze the main changes in the way how the writing process has been conceived during the last years and in the challenges these conceptions pose the teaching of writing.
Adapting Building Design to Access by Individuals with Intellectual Disability
L Castell
Australasian Journal of Construction Economics and Building , 2012,
Abstract: Over the last 15 years, since introductionof the Disability Discrimination Act (DDA)(Commonwealth Government of Australia,1992), there has been much discussionabout the extent and nature of buildingaccess for the disabled, particularly inresponse to proposed revisions to theBuilding Code of Australia (BCA) and theintroduction of a Premises Standardcovering building access. Much of theargument which contributed to the twoyear delay in submitting a final version ofthese documents for government approvalrelated to the extent of access provisionsand the burden of cost. The final versionsubmitted to government by the AustralianBuilding Codes Board (ABCB) (notreleased publicly) appears to still containinconsistencies between the DDA and theBCA in several areas such as wayfindingand egress.In the debate preceding submission of thefinal version there appears to have beenlittle reference to access requirements forindividuals with intellectual disability (ID).This may be due to a general lack ofresearch on the topic. Consequently, thispaper uses a combination of theknowledge gained from a limited numberof previous wayfinding studies, literaturedescribing general problems faced bythose with ID and the author’s personalexperience observing others with ID tocreate a list of probable difficulties andsuggested solutions. The paperconcludes with a discussion about theassociated cost implications and benefitsin providing the required access.
Globalización, sociedad y política en la era de la Información
Castell Manuel
Bitácora Urbano-Territorial , 2011,
Abstract: Después de concluir mi libro La ciudad y las a masas, hace15 a os, empecé a sentir que había un extraordinario cambio multidimensional en todo el mundo. Desde luego cambio tecnológico; pero también reestructuración económica, que en parte adquiría la forma del denominado neoliberalismo, pero que iba más lejos que alcanzar las sociedades que he llamado estatistas – en ese entonces conocidas como sociedades de socialismo real-, comprometidas también en una reestructuración desde el nombre de perestroika. Ocurrió que la perestroika socialista fracasó, mientras que desde el punto de vista capitalista y sus intereses la perestroika capitalista funcionó –al menos para el capitalismo, aunque no tanto para la gente-, había también un cambio cultural profundo ligado a movimientos sociales culturales como el feminista en un sentido amplio, los movimientos urbanos y ecologístas. Es decir, había una serie de procesos históricos de cambio tecnológico, económico y cultural que interactuaban, aunque tenían origen independiente. En su conjunto estaban transformando el mapa político, intelectual e ideológico, sin que realmente supiéramos qué estaba pasando, en buena parte porque estábamos intentando analizarlos con categoría y datos obsoletos.
Large deviations for intersection local times in critical dimension
Fabienne Castell
Mathematics , 2008, DOI: 10.1214/09-AOP499
Abstract: Let $(X_t,t\geq0)$ be a continuous time simple random walk on $\mathbb{Z}^d$ ($d\geq3$), and let $l_T(x)$ be the time spent by $(X_t,t\geq0)$ on the site $x$ up to time $T$. We prove a large deviations principle for the $q$-fold self-intersection local time $I_T=\sum_{x\in\mathbb{Z}^d}l_T(x)^q$ in the critical case $q=\frac{d}{d-2}$. When $q$ is integer, we obtain similar results for the intersection local times of $q$ independent simple random walks.
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