Geraldo Xexéo

Geraldo Xexéo
Federal University of Rio de Janeiro | UFRJ · Programa de Engenharia de Sistemas e Computação

Doctor of Engineering

About

154
Publications
22,639
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
386
Citations

Publications

Publications (154)
Conference Paper
Este artigo apresenta uma iniciativa de utilização de Inteligência Artificial no âmbito da Defensoria Pública do Estado do Rio de Janeiro, a Caixa de Intimação com Inteligência Artificial (CICIAR), desde a motivação para o seu desenvolvimento até os benefícios dos usuários do serviço implementado. Os resultados apontam melhorias para a Defensoria P...
Conference Paper
Full-text available
This article presents the formalization of the methodology used by members of a Ludology Laboratory to develop games with purpose. The methodology consists of a five-step process: Conception, Project, Development, Evaluation, and Packaging, and also by the tools and practices used during the execution of its tasks. It was defined by considering exp...
Article
Full-text available
Although the use of games as an educational strategy is an important current trend, there is practically no option available for training people on the Drug Discovery and Development (DDD) process. To fill this gap, we designed "SCREENER", a science game that is intended to be educational, but also challenging and interesting enough to ensure playe...
Poster
Full-text available
RESUMO No âmbito do Ministério da Defesa, o planejamento para o emprego do poder militar no nível operacional é orientado pelo Processo de Planejamento Conjunto (PPC), contido na Doutrina de Operações Conjuntas (MD30-M-01). A base deste processo é a primeira etapa, o Exame de Situação, onde o Comandante e seu Estado-Maior analisam as dimensões do p...
Conference Paper
Full-text available
In this work, we explore the use of KNIME to identify toxic behavior in the MOBA game DOTA 2. Using a dataset composed of 10530 messages taken from 1903 matches, we tested the use of KNIME to identify toxic messages obtaining an accuracy of 92% and 85% for toxic and non-toxic messages, respectively. The DOTA 2 game chat log was used to present a lo...
Conference Paper
Full-text available
This article presents the formalization of the methodology used by members of a Ludology Laboratory to develop serious games. The methodology is made of a five-step process: Conception, Project, Development, Evaluation, and Packaging, and also by the tools and practices which are used during the execution of its tasks. It was defined by considering...
Conference Paper
Full-text available
Este trabalho apresenta a análise de métodos de design de jogos sérios sob a ótica da Design Science Research. Uma revisão rápida da literatura identificou dez métodos de design de jogos sérios. Comparou-se as etapas descritas nestes métodos com as etapas da DSR, identificando a ausência total de duas etapas da DSR e a cobertura parcial de oito eta...
Conference Paper
Em um mundo com cada vez mais computadores, é imprescindível que as pessoas saibam resolver problemas usando computadores de forma eficaz. Para tal, é necessário introduzir pessoas ao Pensamento Computacional: um meio de resolver problemas que consiste em interpretar e dividir problemas grandes em problemas menores com soluções conhecidas e descrev...
Conference Paper
This work aims to define meaningful actions that players can take in a wargame. Starting from the premise that wargames are (serious) games, we wondered if a wargame and its actions could be well modeled as a game. We looked at formal approaches and decided to model wargames in MDA since this framework analyzes the actions in games as mechanics or...
Conference Paper
Este artigo apresenta o processo de concepção e desenvolvimento do Mapa do Tesouro, um jogo eletrônico para o ensino de Pensamento Computacional Concorrente, um conceito derivado do Pensamento Paralelo, que por sua vez, seria um componente do Pensamento Computacional apresentado por Wing. O jogo desenvolvido tem como público alvo crianças de idade...
Article
Full-text available
As public services become digital and online, both the need to design digital public services closer to citizens’ expectations and to provide ways to improve their participation and engagement increases. To participate and co-design, citizens must understand how the public service is delivered, but understanding service provision is challenging for...
Conference Paper
Full-text available
Despite the importance of STEM for economic development, the area still presents an impressive gender gap, as women account for only 29% of students enrolled in STEM courses in Brazil, with participation rates falling to nearly 10% in Computing and certain Engineering courses [1]. Considering this challenge, we created the Heroine Learning Journey...
Conference Paper
Full-text available
Este trabalho propõe o desenvolvimento de três estratégias distintas para detectar precocemente predadores sexuais em conversas realizadas na internet entre duas pessoas. Serão utilizadas conversas da base de dados do PAN 2012 e algoritmos como SVM, Floresta Aleatória, KNN e BERT. Espera-se superar o estado da arte e provar que a estratégia "Distin...
Conference Paper
Full-text available
Victory prediction in online video games has become an important application for machine learning due to the large amount of data generated by these games and their growing popularity. The creation of professional leagues also drives these applications, as teams want to know their chances of victory and know what are the determining factors to achi...
Article
As public services become digital and online, both the need to design digital public services closer to citizens? expectations and to provide ways to improve their participation and engagement increases. To participate and co-design, citizens must understand how the public service is delivered, but understanding service provision is challenging for...
Conference Paper
Full-text available
Atualmente as organizações são desafiadas na tentativa de fazer com que seus clientes se aproximem e possam contribuir na inovação e melhoria de seus processos de negócio. Neste contexto, percebeu-se que estas melhorias passam pela compreensão dos processos pelos clientes tornando-os aptos a contribuir. Esta pesquisa explorou o design de jogos digi...
Conference Paper
Full-text available
In the past few years, the gender gap has reduced globally but there is still a long road ahead until parity. At the current rate, it will take 99.5 years to close the gap globally and 59 years to do it in Latin America. In Brazil, female enrolment in tertiary education has increased but participation in STEM programs is still low when compared wit...
Conference Paper
Full-text available
Devido a pandemia de COVID-19, as informações sobre formas de prevenção se tornaram essenciais e constantes no dia-a-dia e, mesmo com o fácil acesso a elas, existem pessoas que não consideram como real a ameaça de contaminação. Nesse sentido, a partir o aumento da procura por jogos digitais em meio a pandemia como alternativaà socialização durante...
Conference Paper
Full-text available
Projetar novos jogos é uma atividade complexa e que requer experiência dos envolvidos para alcançar resultados satisfatórios. Dessa forma, a utilização de variantes para aplicação de modificações em um jogo já existente se destaca no objetivo de criar um jogo suficientemente diferente, onde sua forma original não seja imediatamente reconhecida e a...
Conference Paper
Segundo dados do IBGE de 2013, o Brasil possui mais de 7,8 milhões de pessoas com algum tipo de deficiência visual. Este artigo apresenta um audio game chamado Deezarm, que fornece apenas feedback auditivo para o jogador. Nossa proposta surgiu pela escassez de jogos voltados para o público deficiente visual parcial ou total. Como a maioria dos jogo...
Article
This work proposes a methodology applied to repositories modeled using star schemas, such as data marts, to discover relevant time series relations. This paper applies a set of measures related to association, correlation, and causality to create connections among data. In this context, the research proposes a new causality function based on peaks...
Preprint
UNSTRUCTURED Aedes aegypti is a vector for the transmission of diseases such as dengue fever, chikungunya, Zika fever, and yellow fever. In 2016, over one million cases of these diseases were reported in Brazil — an alarming public health issue. One of the ways of controlling the disease is by inspecting and neutralizing the places where the Aedes...
Article
Full-text available
Background: Aedes aegypti is a vector for the transmission of diseases such as dengue fever, chikungunya, Zika fever, and yellow fever. In 2016, over 1 million cases of these diseases were reported in Brazil, which is an alarming public health issue. One of the ways of controlling this disease is by inspecting and neutralizing the places where A. a...
Conference Paper
Full-text available
Este artigo apresenta uma visao preliminar do ˜ metamodelo de cores e emoc¸oes, para arte conceitual de um ˜ jogo digital, a fim de apoiar a escolha de cores para transmitir emoc¸oes num jogo. Este trabalho tem como uma de suas bases ˜ a existencia de significados psicol ˆ ogicos e culturais associados ´ a` percepc¸ao das cores na sociedade. Teve t...
Conference Paper
Full-text available
In the last decade, games with a purpose (GWAP) have emerged as an effective way to recruit and organize a large number of volunteers to help address difficult challenges. In previous work, a framework for crowdsourced collection, cleaning, and measurement of digital content was presented and used in the design of Cassino Musical, a game for procur...
Conference Paper
Organizações de software vêm demonstrando grande interesse no desenvolvimento de jogos e por este motivo, a academia tem buscado desenvolver técnicas, métodos e ferramentas para verificar a qualidade destas aplicações. Neste contexto, muitos pesquisadores têm procurado desenvolver novas abordagens para construir jogos. Um exemplo disso é o framewor...
Article
Full-text available
Serious games are useful tools to engage, educate and train individuals in many areas. They are also suitable for the business processes management area where it is expected that business process-based digital games can bring together players (process actors) to better understand and learn organizational business processes. Building business proces...
Preprint
Full-text available
This work lists and describes the main recent strategies for building fixed-length, dense and distributed representations for words, based on the distributional hypothesis. These representations are now commonly called word embeddings and, in addition to encoding surprisingly good syntactic and semantic information, have been proven useful as extra...
Article
Full-text available
The process of designing a game involves many phases. We can summarize the work of the game designer as satisfactorily converting the idea in their mind to a digital game, which is not a simple task. Therefore, game designers should have a variety of tools to assist them. However, there are not that many specialized tools to support the game design...
Article
Full-text available
Este artigo apresenta os resultados de uma pesquisa-ação que teve como finalidade o desenvolvimento de um processo de consolidação de dados para pesquisas de tráfego no Departamento Nacional de Infraestrutura de Transportes (DNIT). A importância das pesquisas de tráfego para o planejamento do sistema viário nacional obrigou o DNIT a desenvolver um...
Conference Paper
As dificuldades encontradas nos cursos superiores de ciência da computação para ensinar programação têm gerado um afastamento cada vez maior por parte dos estudantes. As taxas de evasão aumentam e nada significativo tem sido feito para reverter esse cenário. Nossa pesquisa, porém, identificou que jogos digitais com o propósito de ensinar esse tipo...
Conference Paper
Full-text available
Projetar novos jogos, tanto digitais como de tabuleiro, não é uma tarefa fácil, sendo normalmente realizada de forma ad-hoc. Esse artigo investiga a possibilidade de usar modificações passo a passo como parte de uma metodologia de criação de jogos, usando para isso um estudo de caso onde se parte de Xadrez para criar um jogo novo e suficientemente...
Conference Paper
Full-text available
odas as organizações possuem e executam processos para atender seus objetivos de negócio, visando obter vantagens competitivas. Além disso, elas procuram melhorá-los por meio de iniciativas inovadoras e de redesenho de suas atividades. Abordagens como a GPN Social, por exemplo, propõe meios para a inovação dos processos, trazendo novas formas de ap...
Conference Paper
All organizations perform process to reach their business objectives, aiming to get competitive advantage, improving them by means of innovation and redesign activities. Some approaches, like Social BPM, argue that own clients can contribute with the business process innovations, but these clients have also own interests and motivations, making tha...
Article
Full-text available
Public service delivery is the main goal of public institutions,but these services, are considered complex, contributing to serviceusers’ dissatisfaction, and consequently, to the detachment betweencitizens and public institutions. Shortening this gap is one of theobjectives of the digital democracy research area, which believesthat public service...
Article
Full-text available
The generation of natural language from Resource Description Framework (RDF) data has recently gained significant attention due to the continuous growth of Linked Data. A number of these approaches generate natural language in languages other than English, however, no work has been proposed to generate Brazilian Portuguese texts out of RDF. We addr...
Technical Report
Full-text available
Digital games are used often in many areas as tools able to teach something. Also in business process management there are some proposals of training stakehold-ers and simulate process models from the use of digital games. In contrast of that (use games to support teaching and learning), this paper argues the opportunity of the use of process model...
Article
This work proposes an algorithm that uses paths based on tile segmentation to build complex clusters. After allocating data items (points) to geometric shapes in tile format, the complexity of our algorithm is related to the number of tiles instead of the number of points. The main novelty is the way our algorithm goes through the grids, saving tim...
Article
Full-text available
Mathematical information retrieval is a relatively new area, so the first search tools capable of retrieving mathematical formulas began to appear only a few years ago. The proposals made public so far mostly implement searches on internal university databases, small sets of scientific papers, or Wikipedia in English. As such, only modest computing...
Conference Paper
Full-text available
Em diversos governos no mundo, surgem legislações e iniciativas sobre melhorias e inovações nos processos de prestação de serviços públicos. A complexidade destes serviços e a falta de entendimento da população, contribuem para que haja um distanciamento entre os cidadãos e as instituições públicas. Diminuir a distância entre estes dois atores perm...
Conference Paper
Full-text available
This article describes the technological infrastructure used to carry out the National Traffic Survey (PNT) 2016-2017 or National Survey Origin and Destination (PNOD). The traffic surveys for the National Traffic Counting Plan (PNCT) are carried out in up to 300 stations spread throughout the country and are scheduled to occur in four distinct stag...
Article
Heuristic Retrieval (HR) task aims to retrieve a set of documents from which the External Plagiarism detection identifies plagiarized pieces of text. In this context, we present Minmax Circular Sector Arcs (MinmaxCSA) algorithms that treats HR task as an approximate k-nearest neighbor search problem. Moreover, MinmaxCSA algorithms aim to retrieve t...
Conference Paper
Full-text available
Resumo Esse artigo tem como objetivo apresentar, discutir e avaliar as decisões tecnológicas relacionadas ao software de um projeto do Departamento Nacional de Infraestrutura e Transportes (DNIT), incluindo a tecnologia de construção de aplicativos (Mobile para tablets e desktop para notebooks), sua arquitetura e metodologia. O estudo é baseado na...
Technical Report
Full-text available
This technical report aims at the formal definition of the object of study of the Laboratory of Ludology, Engineering and Simulation (LUDES), established in the System Engineering and Computing Program. Ludology is the study of games. This study would compete for the name "Game Theory", already established in Mathematics and Economics. In the liter...
Article
Many graph clustering algorithms focus on producing a single partition of the vertices in the input graph. Nevertheless, a single partition may not provide sufficient insight about the underlying data. In this context, it would be interesting to explore alternative clustering solutions. Many areas, such as social media marketing demand exploring mu...
Article
This paper addresses a relatively new concept: the buzzword. Buzzwords are fashionable words that continue gaining popularity until a tipping point is reached and then their popularity declines. Our goal in this study is to identify buzzwords through their frequency of occurrence over the years, using two clustering techniques: k-means and the self...
Article
Full-text available
A curiosidade de saber o que as pessoas pensam e como se sentem em relacao aos acontecimentos do dia a dia sempre existiu. Com o avanco da Web 2.0 e a ampla divulgacao da opiniao das pessoas na rede de computadores, este interesse passou a ser ainda maior, saindo do aspecto pessoal e atingindo tambem as acoes de marketing das empresas. Neste trabal...
Conference Paper
Many graph clustering algorithms aim at generating a single partitioning (clustering) of the data. However, there can be many ways a dataset can be clustered. From a exploratory analisys perspective, given a dataset, the availability of many different and non-redundant clusterings is important for data understanding. Each one of these clusterings c...
Article
Full-text available
Um problema importante em análise de redes sociais é o particionamento de seus usuários com o objetivo de descobrir grupos que possuem interesses ou características comuns. Dada uma coleção de objetos, tipicamente não existe apenas uma única maneira de formar as partições. Além disto, quando objetos são usuários de uma rede social, cada objeto pode...
Conference Paper
Observar notícias de governo é uma atividade comum entre gestores, jornalistas e cidadãos em geral. O simples fato de identificar o que é uma notícia de governo pode se tornar um processo trabalhoso se o mecanismo de busca não for o mais adequado. Um procedimento ainda mais desafiador é estabelecer um ranqueamento entre quais notícias de governo sã...
Article
Full-text available
Follow the government news is an ordinary activity between managers, journalists and citizen in generals. Simply identify what is news of government can become a laborious process if the search engine is not the most appropriate. An even more challenging procedure is to establish a ranking between government news which are most relevant in a given...
Chapter
A hypermedia system gives too much freedom to the user to navigate through the hyperspace. An Adaptive Hypermedia System (AHS) gives personalized content, presentation, and navigation support to help user find the information she needs or complete her tasks. In this chapter we focus on AH systems with educational purpose and are interested in evalu...
Article
This paper presents a framework system, called ProcessSearch, which is used to search and identify business process descriptions stored on the web. Some metrics were proposed in order to identify the web documents describing a business process. Identifying descriptions of business processes is a difficult task because the web stores "bag-of-words"...
Conference Paper
The aim of this paper is to present a framework for crowd sourced collection, cleaning and measurement of digital content that follows the dynamics of a game with a purpose (GWAP) for capturing the collective knowledge and also for computing tasks through players' interactions. Using this framework we developed a game called Cassino Musical as a so...
Conference Paper
This paper presents and discusses in detail the results obtained by an evaluation of an adaptive course served by the GALE system developed in the EU FP7 project GRAPPLE. The main goal of that evaluation is to understand the influence of adaptation on students’ learning in an adaptive hypertext course. We analyzed the students’ logs, the performed...
Conference Paper
Full-text available
An important problem in social network analysis is the partitioning of its users, in order to discover groups of user that have common interests or characteristics. Given a collection of objects to be clustered, typically there is not a single way of forming the partitions. Besides, when objects are users of a social network, each object may be pre...
Conference Paper
Search engines are traditionally designed to support a single user working alone; however, the literature describes various problems faced by children in the use of this search model. The construction of knowledge is enriched when collaboration is aggregated to search tasks. We propose a collaborative information retrieval architecture for children...
Conference Paper
Full-text available
Identifying and measuring a musical talent is not a simple task that could be performed by computers. In addition to the technical challenges, it also involves social, emotional and cultural issues. This problem is aggravated when the task needs to be performed taking as input the huge amount of music content available on the Internet today. In thi...
Article
Full-text available
We study the network structure of Wikipedia (restricted to its mathematical portion), MathWorld, and DLMF. We approach these three online mathematical libraries from the perspective of several global and local network-theoretic features, providing for each one the appropriate value or distribution, along with comparisons that, if possible, also inc...
Article
Full-text available
The curiosity for knowing what people think and how they feel about daily events has always existed. This study aims to satisfy this need and analyze if people react in a positive or negative way to news reported in the media. To this end, 3 distinct topics were selected and, for each one of them, information published on the microbblogging service...
Conference Paper
The amount of data available in semi-structured or unstructured format grows exponentially. The area of text mining aims at discovering knowledge from data of this type. Most work in this area uses the model known as bag of words to represent the texts. This form of representation, although effective, minimizes the quality of knowledge discovered b...