Search results for "information networks"
showing 10 items of 91 documents
An empirical study on classical and community-aware centrality measures in complex networks
2021
Community structure is a ubiquitous feature in natural and artificial systems. Identifying key nodes is a fundamental task to speed up or mitigate any diffusive processes in these systems. Centrality measures aim to do so by selecting a small set of critical nodes. Classical centrality measures are agnostic to community structure, while community-aware centrality measures exploit this property. Several works study the relationship between classical centrality measures, but the relationship between classical and community-aware centrality measures is almost unexplored. In this work [1], we answer two questions: (1) How do classical and community-aware centrality measures relate? (2) What is …
A web application for event detection and exploratory data analysis for Twitter data
2015
International audience
Hyvää verkko-opetusta etsimässä: oppimista edistävät ja estävät tekijät verkko-oppimisympäristöissä – opiskelijoiden kokemuksen ja opettajien arviot
2003
Tutkimuksen tarkoituksena oli selvittää opiskelijoiden ja opettajien käsityksiä hyvästä verkko-opetuksesta ja -opiskelusta. Tutkimuksessa keskityttiin erityisesti verkko- opettajan roolin ja tehtävien tarkasteluun. Verkko-opetusta tutkittiin osana opetus-opiskelu-oppiminen prosessia (Uljens 1997, Kansanen 1999). Hyvän verkko-opettajan ominaisuuksia etsittiin tehokkaan opettajan kriteerien (Tirri 1993), opettajan pedagogisen ajattelun ja verkko-opettajatutkimuksien lähtökohdista käsin. Mielekäs oppiminen määriteltiin Jonassenin (1995) esittämien kriteerien lähtökohdista. Tutkimuksen empiirinen aineisto koostui vuosina 1995-1999 Helsingin yliopiston virtuaalisen avoimen yliopiston (HEVI) ja A…
Frontières des communautés polarisées : application à l'étude des théories complotistes autour des vaccins
2021
Les données des réseaux sociaux sont de plus en plus utilisées pour en extraire de la valeur, dans des domaines tels que le marketing, la politique ou la sociologie. Celles-ci peuvent être représentées sous forme de graphes, en modélisant précisément les interactions à travers des liens dirigés et pondérés. Dans l'analyse des données des réseaux sociaux, l'étude des communautés est une étape essentielle. Toutefois, pour une interprétation fine des phénomènes, il est également nécessaire d'étudier leurs interactions et de pouvoir détecter des traces de polarisation. Nous proposons une méthode qui permet d'évaluer l'antagonisme des communautés et d'identifier leurs frontières dans des réseaux…
Opinion dynamics and stubbornness through mean-field games
2013
This paper provides a mean field game theoretic interpretation of opinion dynamics and stubbornness. The model describes a crowd-seeking homogeneous population of agents, under the influence of one stubborn agent. The game takes on the form of two partial differential equations, the Hamilton-Jacobi-Bellman equation and the Kolmogorov-Fokker-Planck equation for the individual optimal response and the population evolution, respectively. For the game of interest, we establish a mean field equilibrium where all agents reach epsilon-consensus in a neighborhood of the stubborn agent's opinion.
Efectos de las consultas boca a boca en redes sociales en la compra de cosméticos en Ecuador.
2022
Las redes sociales han reestructurado el paradigma de la comunicación en el marketing. Investigaciones recientes demuestran que la conducta de consultar reseñas está adquiriendo un rol fundamental en la decisión de compra de los consumidores. En este contexto, el presente estudio desarrolló un marco de investigación para determinar la cadena de relación entre influencia social, credibilidad percibida del boca a boca, adopción del boca a boca e intención de compra aplicada a la industria cosmética del Ecuador. A través de una muestra de 406 consumidores y la aplicación del método de análisis de ecuaciones estructurales, los resultados evidencian el vínculo existente entre las variables plant…
Kyberin taskutieto : keskeisin kybermaailmasta jokaiselle
2017
Maritime Information Networks between Northern and Southern Europe during the Eighteenth century
2019
International trade during the 18th century is a case in point through which to study in-depth the challenges of asymmetric information. The challenges can be divided into three categories: availability, reliability and usability of information. This article discusses the organization of trade and shipping between Northern and Southern Europe. The access, reliability and use of information were problems for merchant-shipowners during the 18th century. The solutions adopted were partly contradictory: the aim to reduce information asymmetry on one determinant, might incur costs on the other.
Modeling epidemics through ladder operators
2020
Highlights • We propose an operatorial model to describe epidemics. • The model describes well the asymptotic numbers of the epidemics. • Ladder operators are used to model exchanges between the “actors” of the system.
Connecting others: Does a tertius iungens orientation shape the relationship between research networks and innovation?
2021
Research on social networks and innovation emphasizes that individuals spanning structural holes and crossing institutional boundaries have more opportunities for knowledge recombination and innovation involvement. However, transforming the potential knowledge and resources available through personal networks to attain innovation can be difficult for the focal individual. Using an ego-network approach, this study examines whether and to what extent an individual strategic orientation to cooperation (i.e. tertius iungens) contributes to strengthening the relation between two personal network properties (structural and institutional separation) and involvement in innovation. Our analysis is c…