Viktoriya Semeshenko - Academia.edu (original) (raw)

Papers by Viktoriya Semeshenko

HAL (Le Centre pour la Communication Scientifique Directe), Nov 27, 2006

National audienceDe nombreux phénomènes collectifs (manifestations, émeutes, assistance à un sémi... more National audienceDe nombreux phénomènes collectifs (manifestations, émeutes, assistance à un séminaire, adoption de nouveaux standards technologiques) peuvent être interprétés en termes de "masse critique". Ce principe évoque une activité collective qui s'auto-entretient lorsqu'elle dépasse un certain seuil. Cette communication étudie la relation entre les caractéristiques du comportement individuel et celles du comportement collectif, avec le principe de masse critique. La question est modélisée avec un jeu de coordination à n joueurs, avec plusieurs équilibres (états collectifs) possibles selon la distribution des "seuils" individuels, le nombre de personnes que chaque agent considère comme suffisant pour modifier son comportement. L'objectif des auteurs est de déterminer les conditions minimales d'information permettant une coordination efficace. Ils présentent les résultats d'une série d'expériences sous différentes conditions d'information et montrent que la coordination est d'autant plus efficace que l'information dispensée aux joueurs est importante

arXiv (Cornell University), Nov 2, 2022

Día a día, las personas nos informamos consumiendo noticias de diferentes medios. Estudios empíri... more Día a día, las personas nos informamos consumiendo noticias de diferentes medios. Estudios empíricos demuestran que la dinámica de formación de opiniones durante períodos electorales está fuertemente influenciada por los medios de comunicación masivos [1]. Desde otro enfoque, las investigaciones teóricas realizadas en los últimos años muestran también cómo los medios pueden repercutir de forma directa en una sociedad [2]. En este trabajo se realizó un estudio teórico-empírico del rol político de los medios de comunicación utilizando técnicas de procesamiento del lenguaje natural y métodos estadísticos. Para ello, se analizaron todas las frases provenientes de todas las noticias relacionadas con los candidatos procedentes de grandes medios de comunicación(The New York Times, Fox News y Breitbart) durante el período preelectoral estadounidense del 2016 entre los candidatos Donald Trump y Hillary Clinton (28/07/2016 a 08/11/2016). Se utilizaron algoritmos de detección de tópicos en tex...

EPJ manuscript No. (will be inserted by the editor) Crime and punishment: the economic burden of ... more EPJ manuscript No. (will be inserted by the editor) Crime and punishment: the economic burden of impunity

Chaos, Solitons & Fractals

Individuals’ decisions in social systems are frequently influenced by the behavior or choices of ... more Individuals’ decisions in social systems are frequently influenced by the behavior or choices of others. These social effects may lead to multiple collective states, bringing up coordination problems. The outcome cannot be predicted a priori even in small systems. Depending on the intensity of interactions and the individuals’ learning capacities, non-optimal states may emerge, due to coordination failures. Understanding the emergence of collective states, which comes from the individual behavior of a large number of interacting individuals, is essential for the comprehension of social and industrial organizations. Here we present a study of such collective phenomena using methods of statistical physics and numerical simulations. We explore how the heterogeneity of the individuals, their interactions and learning capacities influence the system’s behavior. Equilibrium properties and dynamics obtained with various learning scenarios are thoroughly analyzed. Furthermore, interesting e...

(will be inserted by the editor) Information-driven coordination: experimental results with heter... more (will be inserted by the editor) Information-driven coordination: experimental results with heterogeneous individuals

The international trade is one of the classic areas of study in economics. Nowadays, given the av... more The international trade is one of the classic areas of study in economics. Nowadays, given the availability of data, the tools used for the analysis can be complemented and enriched with new methodologies and techniques that go beyond the traditional approach. The present paper shows the application of the Latent Dirichlet Allocation Models, a well known technique from the area of Natural Language Processing, to search for latent dimensions in the product space of international trade, and their distribution across countries over time. We apply this technique to a dataset of countries' exports of goods from 1962 to 2016. The findings show the possibility to generate higher level classifications of goods based on the empirical evidence, and also allow to study the distribution of those classifications within countries. The latter show interesting insights about countries' trade specialisation.

El objetivo de este trabajo es establecer el impacto del Metroplus, el sistema BRT de Medellin so... more El objetivo de este trabajo es establecer el impacto del Metroplus, el sistema BRT de Medellin sobre los precios de vivienda en la ciudad, utilizando datos de corte transversal repetidos de la Encuesta de Calidad de Vida de Medellin 2010 y el 2014. A traves de una estimacion de diferencias en diferencias a nivel de ciudad y por zonas, la investigacion encuentra que la accesibilidad al Metroplus tuvo un efecto negativo sobre la tasa de crecimiento de los precios de alquiler que puede atribuirse a las diferencias de implementacion y los resultados en cada zona de la ciudad. Palabras clave: Transporte publico, sistemas de buses rapidos, modelo de Precios hedonicos, estimador de diferencias en diferencias.

Journal of Physics: Complexity, 2020

Applied Network Science, 2019

The voter model has been widely studied due to its simple formulation and attainable theoretical ... more The voter model has been widely studied due to its simple formulation and attainable theoretical treatment. The study of the “active links”, edges that connect nodes in different states, has been a key element in the analysis of the convergence of the model. Typically, the density of active links, ρ, is used to characterize the system when approaching to absorbing state. However, more information can be extracted from how the active links are distributed across the underlying network.In this paper we study the dynamics of active links in the voter model, from a perspective of complex networks. This approach allows us to understand how the dynamics of the model is mapped in topological features of a dynamical network of active links. We found that certain topological properties of the Active Link Network show salient features related to the dynamics of the model. The Active Link Network goes from a state similar to the underlying random network in the initial state to extremely disas...

Chaos, Solitons & Fractals, 2017

European Journal of Economic and Social Systems

In this paper we explore the impact of social influence on the equilibria in the simplest model w... more In this paper we explore the impact of social influence on the equilibria in the simplest model with binary choices. We investigate the interplay between the social influence and individual decision to adopt with global interactions, both analytically in the case of an infinite number and numerically in the case of a finite number of agents. We derive exactly necessary and sufficient conditions for existence of single or multiple equilibria as a function of the strength of social influence. In particular, this model encompasses the classical downward sloping demand curve as a particular case. The paper also provides a brief introduction to avalanches and hysteresis loops, and includes extensive bibliographical references.

Page 1. How to choose under social influence ? Mirta B. Gordon (1) Jean-Pierre Nadal (2) Denis... more Page 1. How to choose under social influence ? Mirta B. Gordon (1) Jean-Pierre Nadal (2) Denis Phan (1,3) - Viktoriya Semeshenko (1) (1) Laboratoire Leibniz - IMAG - Grenoble (2) Laboratoire de Physique Statistique ENS - Paris (3) CREM Université de Rennes I ...

PLOS ONE

International trade is one of the classic areas of study in economics. Its empirical analysis is ... more International trade is one of the classic areas of study in economics. Its empirical analysis is a complex problem, given the amount of products, countries and years. Nowadays, given the availability of data, the tools used for the analysis can be complemented and enriched with new methodologies and techniques that go beyond the traditional approach. This new possibility opens a research gap, as new, data-driven, ways of understanding international trade, can help our understanding of the underlying phenomena. The present paper shows the application of the Latent Dirichlet allocation model, a well known technique in the area of Natural Language Processing, to search for latent dimensions in the product space of international trade, and their distribution across countries over time. We apply this technique to a dataset of countries’ exports of goods from 1962 to 2016. The results show that this technique can encode the main specialisation patterns of international trade. On the count...

We consider a social system of interacting heterogeneous agents with learning abilities, a model ... more We consider a social system of interacting heterogeneous agents with learning abilities, a model close to Random Field Ising Models, where the random field corresponds to the idiosyncratic willingness to pay. Given a fixed price, agents decide repeatedly whether to buy or not a unit of a good, so as to maximize their expected utilities. We show that the equilibrium reached by the system depends on the nature of the information agents use to estimate their expected utilities.

Crime is an economically important activity, sometimes called the industry of crime. It may repre... more Crime is an economically important activity, sometimes called the industry of crime. It may represent a mechanism of wealth distribution but also a social and economic charge because of the cost of the law enforcement system. Sometimes it may be less costly for the society to allow for some level of criminality. A drawback of such policy may lead to a high increase of criminal activity that may become hard to reduce. We investigate the level of law enforcement required to keep crime within acceptable limits and show that a sharp phase transition is observed as a function of the probability of punishment. We also analyze the growth of the economy, the inequality in the wealth distribution (the Gini coefficient) and other relevant quantities under different scenarios of criminal activity and probability of apprehension.