Browsing Information Technology by Author "Griffith, Josephine"
Now showing items 1-12 of 12
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An analysis of online Twitter sentiment surrounding the European refugee crisis
Pope, David; Griffith, Josephine (SciTePress Digital Library, 2016)Using existing natural language and sentiment analysis techniques, this study explores different dimensions of mood states of tweet content relating to the refugee crisis in Europe. The study has two main goals. The first ... -
A comparison of automatic labelling approaches for sentiment analysis
Biswas, Sumana; Young, Karen; Griffith, Josephine (SciTePress, 2022-07-11)Labelling a large quantity of social media data for the task of supervised machine learning is not only time-consuming but also difficult and expensive. On the other hand, the accuracy of supervised machine learning models ... -
Cyclic dominance in the spatial coevolutionary optional prisoner's dilemma game
Cardinot, Marcos; O'Riordan, Colm; Griffith, Josephine (CEUR-WS.org, 2016-09-20)This paper studies scenarios of cyclic dominance in a coevolutionary spatial model in which game strategies and links between agents adaptively evolve over time. The Optional Prisoner’s Dilemma (OPD) game is employed. ... -
Evolution of cooperation in N-player social dilemmas: The importance of being mobile
Gibbons, Maud D.; O'Riordan, Colm; Griffith, Josephine (SciTePress Digital Library, 2016)This paper addresses issues regarding the emergence of cooperation in evolutionary, spatial game-theoretic simulations. In the model considered, agents participate in a social dilemma with their neighbours and have the ... -
An evolutionary approach to formation control with mobile robots
Holland, Jane; Griffith, Josephine; O'Riordan, Colm (SciTePress Digital Library, 2016)The field of swarm robotics studies multi-robot systems, emphasising decentralised and self-organising behaviours that deal with limited individual abilities, local sensing and local communication. A robotic system needs ... -
Evolving collective behaviours in simulated kilobots
Holland, Jane; Griffith, Josephine; O'Riordan, Colm (Association for Computing Machinery, 2018-04-09)The field of Evolutionary Robotics has multiple common tasks and widely used benchmark activities such as navigation, obstacle avoidance, and phototaxis. We present an evolutionary approach to learning behaviours that ... -
Follow flee: A contingent mobility strategy for the spatial prisoner's dilemma
Gibbons, Maud D.; O'Riordan, Colm; Griffith, Josephine (Springer Verlag, 2016-08-10)This paper presents results from a series of experimental simulations comparing the performances of mobile strategies of agents participating in the Spatial Prisoner's Dilemma game. The contingent movement strategies Walk ... -
A further analysis of the role of heterogeneity in coevolutionary spatial games
Cardinot, Marcos; Griffith, Josephine; O'Riordan, Colm (Elsevier, 2017-11-04)Heterogeneity has been studied as one of the most common explanations of the puzzle of cooperation in social dilemmas. A large number of papers have been published discussing the effects of increasing heterogeneity in ... -
Identifying the reality gap between abstract and realistic models using evolved agents and simulated kilobots
Holland, Jane; Gallagher, Ciaran; Griffith, Josephine; O'Riordan, Colm (IEEE, 2018-12-12)A common challenge in evolutionary swarm robotics is the transfer of simulated results into real-world applications. This difficulty can arise in a variety of real-world settings and problems such as sensory differences in ... -
Meme sentiment analysis enhanced with multimodal spatial encoding and facial embedding
Hazman, Muzhaffar; McKeever, Susan; Griffith, Josephine (University of Galway, 2022-12-08)Internet memes are characterised by the interspersing of text amongst visual elements. State-of-the-art multimodal meme classifiers do not account for the relative positions of these elements across the two modalities, ... -
The optional prisoner's dilemma in a spatial environment: Co-evolving game strategy and link weights
Cardinot, Marcus; O'Riordan, Colm; Griffith, Josephine (SciTePress Digital Library, 2016)In this paper, the Optional Prisoner’s Dilemma game in a spatial environment, with coevolutionary rules for both the strategy and network links between agents, is studied. Using a Monte Carlo simulation approach, a number ... -
Simulation of an optional strategy in the prisoner’s dilemma in spatial and non-spatial environments
Cardinot, Marcos; Gibbons, Maud; O'Riordan, Colm; Griffith, Josephine (Springer Verlag, 2016-08-10)This paper presents research comparing the effects of different environments on the outcome of an extended Prisoner's Dilemma, in which agents have the option to abstain from playing the game. We consider three different ...