About
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Introduction
I'm a lecturer at the Engineering and Geoscience Institute of the Federal University of Western Pará (UFOPA). I'm leading the Applied Computing Research Group from UFOPA. Currently, I'm a Technological Development and Innovative Extension Scholar of CNPq (2021-2023).
My research interests are data science for decision support systems, data science, social media analysis, and electronic markets.
Additional affiliations
October 2018 - December 2018
January 2015 - July 2015
September 2012 - August 2014
Position
- Lecturer
Description
- Computer Science: - Computational Intelligence - Design and project of algorithms - Theoretical Computing - Formal Language and automata theory - Compilers Graduate courses: - Knowledge Engineering
Publications
Publications (79)
Abstract A large number of techniques for data analyses have been developed in recent years, however most of them do not deal satisfactorily with a ubiquitous problem in the area: the missing data. In order to mitigate the bias imposed by this problem, several treatment methods have been proposed, highlighting the data imputation methods, which can...
The microblogging service Twitter is one of the world's most popular online social networks and assembles a huge amount of data produced by interactions between users. A careful analysis of this data allows identifying groups of users who share similar traits, opinions, and preferences. We call community detection the process of user group identifi...
The ways of communication and social interactions are changing. Web users are becoming increasingly engaged with Online Social Networks (OSN), which has a significant impact on the relationship mechanisms between individuals and communities. Most OSN platforms have strict policies regarding data access, harming its usage in psychological and social...
Social media usage is expanding in different sectors of society. As a consequence, a large amount of User-Generated-Content is produced every day. Due to its different effects on users, content management is essential for business advertising on these platforms. However, in view of social media’s large volume of content, measuring the effect on use...
Background
In recent years, deep learning has gained remarkable attention in medical image analysis due to its capacity to provide results comparable to specialists and, in some cases, surpass them. Despite the emergence of deep learning research on gastric tissues diseases, few intensive reviews are addressing this topic.
Method
We performed a sy...
Text recognition through natural language processing (NLP) faces challenges when it encounters a word that is not categorized. These types of words are called out-of-vocabulary words (OOV). They are often the subject of representation, local slang, or typing mistakes. These types of content have grown exponentially as the Internet has popularized,...
Globalization, technological innovations, and the coronavirus disease (COVID-19) pandemic have promoted disruptive changes in buying and selling negotiation models through e-communication. As a result, Small and Medium Enterprises (SMEs) have been forced to adapt to online channels. Considering market relevance, this article describes the survey re...
Emerging deep learning-based applications in precision medicine include computational histopathological analysis. However, there is a lack of the required training image datasets to generate classification and detection models. This phenomenon occurs mainly due to human factors that make it difficult to obtain well-annotated data. The present study...
É expressivo o aumento da demanda judicial e da escassez de recursos, prejudicando o atendimento e a agilidade do sistema jurídico brasileiro. Dessa forma, é evidente a necessidade de se investir em novas aplicações tecnológicas para a garantia do bom andamento processual. Assim, a correta classificação das petições facilita a categorização do proc...
As redes sociais estão desempenhando um papel cada vez mais importante no suporte a discursos e agendas do movimento feminista atual. Visando identificar quais as temáticas abordadas pela agenda feminista ao redor do mundo e quais polaridades estão presentes nessas manifestações, este trabalho analisa dados coletados do Twitter relacionados ao Dia...
Social networks are playing an increasingly important role in supporting the discourses and agendas of the current feminist movement. Aiming to identify which themes are addressed by the feminist agenda worldwide and which polarities are present in these manifestations, this paper analyzes data collected from Twitter related to International Women'...
The pervasiveness of Artificial Intelligence (AI) is unquestionable in our society. Even in the arts, AI is present. A notorious case is the song "Hey Ya!" of the OutKast group, successful in the 2000s. At this time, the music industry began to make decisions based on data to strategize based on predictions of listeners' habits. This case is just o...
The Deep-emotive v.1 is a CNN that recognizes emotions by the human face's pictures. In this context, the CNN's structure creation depends on several hyperparameters, which impact the results positively or negatively. The Genetic Algorithm implementation allows us to explore the search space of these hyperparameters to find the best architecture fo...
Amidst the pandemic of the new coronavirus, the proliferation of misinformation and fake news, dispute spaces of speech in virtual environments with journalism, especially in social media. This phenomenon includes hate speech and denial statements, which call into question a scientific investigation of the contamination consequences on a large scal...
The global pandemic, caused by the spread of COVID-19, has altered the way people go shopping. In light of this, Social Media channels are an important means of sharing information about goods and services, and different kinds of brands. Since these channels are of considerable market significance, the authors of this paper decided to describe the...
Social Media and Customer Relationship Management (CRM) are already widely used in business settings, but other non-commercial sectors started only recently to adopt them. Among them are Higher Education Institutions (HEIs). Even though research shows positive effects on the quality of services, student satisfaction, and attractiveness towards inte...
A análise de grupos de pesquisadores e de suas respectivas produções são atividades relevantes e complexas. Na medida em que novos conhecimentos são gerados, é necessário que seja conduzida uma avaliação de todas essas produções, sobretudo quanto a qualidade e impacto. No Brasil, os pesquisadores alimentam a base de dados Lattes com todas as suas p...
The Knowledge Discovery in Database (KDD) process permits the detection of pattern in databases, where this analysis may be compromised if database is not consistent, making necessary the use of data cleaning techniques. This paper presents a tool based in similarity functions to help the preprocessing of databases and it behaved efficiently in the...
The next-generation sequencers such as Illumina and SOLiD platforms generate a large amount of data, commonly above 10 Gigabytes of text files. Particularly, the SOLiD platform allows the sequencing of multiple samples in a single run, called multiplex run, through a tagging system called Barcode. This feature requires a computational process for s...
É inegável o aumento da pervasividade e relevância das mídias sociais em nosso cotidiano. Desde 2012, o Brazilian Workshop on Social Network Analysis and Mining (BraSNAM) representa um importante fórum para reunir pesquisadores a fim de discutir métodos de análise, tendências e fenômenos que ocorrem nas redes sociais. Neste 2021, este evento comple...
O crescimento das plataformas de transmissão ao vivo como a Twitch, impulsionado pelo aumento no volume de criadores de conteúdo, impactou positivamente em uma indústria economicamente importante, os jogos eletrônicos (e-Sports). O destaque da categoria dentro do tipo Multiplayer Online Battle Arena (MOBA) vai para o League of Legends, que foi um d...
Posts with defamatory content or hate speech are constantly foundon social media. The results for readers are numerous, not restrictedonly to the psychological impact, but also to the growth of thissocial phenomenon. With the General Law on the Protection ofPersonal Data and the Marco Civil da Internet, service providersbecame responsible for the c...
Objective: To examine the relationship between geosocial application usage and adoption of preventive practices for Sexually Transmitted Infections (STIs). Methods: Descriptive, prospective and cross-sectional study with a quantitative approach, with 256 students from the Federal University of Western Pará. The data were analyzed with Bioestat® 5.0...
Sentiment Analysis techniques enable the automatic extraction of sentiment in social media data, including popular platforms as Twitter. For retailers and marketing analysts, such methods can support the understanding of customers' attitudes towards brands, especially to handle crises that cause behavioural changes in customers , including the COVI...
Analyzing User-Generated Content present in social media has become mandatory for companies looking for maintaining competitiveness. These data contain information such as consumer opinions, and recommendations that are seen as rich sources of information for the development of decision support systems. When observing the state of the art, it was f...
Novas formas de relacionamento entre empresas e clientes foram introduzidas através do uso massivo de mídias sociais, e têm transformado a forma com a qual clientes tomam decisões de compras. Esta nova realidade explicitou a importância da análise do conteúdo relacionado a marcas e produtos publicados por consumidores em plataformas de mídias socia...
Approximately 80 % of people with some form of physical, mental,or intellectual disability live in developing countries. These samecountries have shown significant growth in the availability of theinternet. Such facts reveal good possibilities regarding access toemotional support and experiences exchange among people withdisabilities through social...
É inegável a pervasividade das mídias sociais em nosso cotidiano, tanto que o fácil acesso e a sensação de anonimato influenciou usuários a compartilharem ativamente suas opiniões. Como consequência, o crescimento exponencial do volume de dados gerou novos desafios em relação a seleção de estudos de caso e formas de coleta dos dados. Neste contexto...
The ways of relationship between companies and customers have changed dramatically due to web-users engagement with Social Media. This phenomenon brought up a new concept, Social Customer Relationship Management (Social CRM), a multidisciplinary and promising research topic. This multidisciplinarity requires the combination of different perspective...
The evolution of Web 2.0 has allowed the development and success of social media, which has brought about drastic changes in how people interact in the online environment. One of the phenomena related to this fact is the massive production of user-generated content that is seen as a powerful data source on customer behavior. These data allowed inno...
Analyzing and extracting information from the User-Generated Content (UGC) has become a prominent research topic. These data contain information such as consumer opinions, classifications, and recommendations for products and services, being a rich information source for assisting purchase decision making. Many papers have been published on UGC rel...
Computational techniques can be used to identify musical trends and patterns, helping people filtering and selecting music according to their preferences. In this scenario, researches claim that the future of music permeates artificial intelligence, which will play the role of composing music that best fits the tastes of consumers. So, extracting p...
Social media are increasingly present in the daily life of humanbeings. As a consequence, the volume of content generated by usersgrows considerably. These contents are published on digital platforms,such as blogs, communities and online social networks. Theanalysis of these data requires different approaches and methods toobtain a satisfactory res...
Resumo: Mídias digitais estão cada vez mais presentes no cotidiano do ser humano. Este fato contribui para que o volume de conteúdo gerado por usuário aumente consideravelmente. De um ponto de vista prático, as análises desses dados requerem diferentes perspectivas e métodos para se obter resultados satisfatórios. Essas análises podem subsidiar a t...
Resumo. O crescimento das plataformas de transmissão ao vivo como a Twitch, impulsionado pelo aumento no volume de criadores de conteúdo, impactou po-sitivamente em uma indústria economicamente importante, os jogos eletrônicos (e-Sports). O destaque da categoria dentro do tipo Multiplayer Online Battle Arena (MOBA) vai para o League of Legends, que...
Customer RelationshipManagement (CRM) has been an important ally to companies willing to improve their customer
experiences. Lately, Machine Learning (ML) and its techniques have been transforming the way companies interact with their
customers through data analysis. This paper reviews the literature on the application of ML techniques to improve C...
As mídias sociais desempenham um papel essencial para as pessoas com deficiência e seus familiares por proporcionarem um canal de denúncia e induzirem a construção de redes de apoio. No entanto, discursos de ódio também são encontrados nessas mídias. Nesse sentido, uma análise das postagens de mídia social sobre notícias relacionadas à deficiência...
Técnicas computacionais podem ser usadas para identificar tendências e padrões musicais, ajudando as pessoas a filtrar e selecionar músicas de acordo com suas preferências. Nesse cenário, pesquisas afirmam que o futuro da música permeia a inteligência artificial, que desempenhará o papel de compor músicas que melhor atendam aos gostos dos consumido...
Histology has provided important predictive phenotypic information on the process and progression in cancer by identifying patterns of histological characteristics, like cell density, mitotic activity, nuclear atypia, and tissue architecture, and is therefore an essential tool for diagnosis and prognosis of the disease. Deep convolutional neural ne...
A Web 2.0 modificou radicalmente a forma pela qual os consumidores tomam decisões de compra, necessitando de uma nova abordagem de gerenciamento de dados de redes sociais, conhecida por Social Customer Relationship Management. Além disso, nesses novos ambientes surgiu o boca-a-boca eletrônico, sendo a capacidade de disponibilizar opiniões sobre pro...
A Web 2.0 modificou radicalmente a forma pela qual os consumidores tomam decisões de compra, necessitando de uma nova abordagem de gerenciamento de dados de redes sociais, conhecida por Social Customer Relationship Management. Além disso, nesses novos ambientes surgiu o boca-a-boca eletrônico, sendo a capacidade de disponibilizar opiniões sobre pro...
As mı́dias sociais têm um importante papel na agenda de lutas feministas por proporcionarem um canal de denúncia e induzirem à redes de apoio. No entanto, discursos de ódio também são veiculados neste tipo de mı́dia. Visando estudar este contraponto, o presente trabalho analisa comentários de notı́cias sobre a tentativa de feminicı́dio da paisagist...
O DATASUS (Departamento de Informática do SUS) fornece informações que apoiam análises objetivas da situação sanitária brasileira, auxiliando em tomadas de decisões baseadas em evidências e elaboração de soluções de ações de saúde. Para acessar tais informações é necessário a utilização das ferramentas disponibilizadas pelo portal do DATASUS que sã...
A vasta biodiversidade da floresta amazônica abre portas para muitos estudos, inclusive acerca da utilização de métodos computacionais para analisar fauna e flora. Verificando uma lacuna no estudo de plantas comestı́veis não convencionais (PANCs) na Região do Oeste do Pará, objetivou-se utilizar de técnicas de visão computacional para identificação...
Os distúrbios no sono são problemas que afetam uma parcela sig- nificativa da sociedade e seu diagnóstico normalmente está condicionado a utilização do método de polissonografia laboratorial. No entanto, essa é uma técnica dispendiosa, inconveniente e incômoda ao paciente durante o processo de triagem. Nesse sentido, o presente artigo apresenta um...
Os distúrbios do sono são problemas recorrentes na sociedade e tem ganhado atenção nos últimos anos, sobretudo quando consideradas as mudanças impostas pelas Tecnologias da Informação e Comunicação (TIC) por permitirem o desenvolvimento de soluções direcionadas à avaliação do sono. Esses distúrbios geralmente estão associados à alguma condição clı́...
The increasing relevance of social media triggered the adoption and application of Social CRM by different companies. In this context, digital marketing agencies must also adapt their services to address these transformations. This paper analyzes the literature and industry information about Social CRM to develop a classification of Social CRM serv...
Customer Relationship Management (CRM) has been an im-portant ally to companies willing to improve their customer experiences. Lately, Machine Learning (ML) and its techniques have been transforming the way companies interact with their customers through data analysis. This paper reviews the litera-ture on the application of ML techniques to improv...
Online Social Networks have been increasingly adopted by web users interested in sharing their opinions and thoughts about restaurants, bars, and products they have visited or bought. This scenario enables new analyses to companies and institutions that seek information on how their audience perceives them, and which aspects should be improved. One...
Disabilities are more related to a social context than to medical conditions. However, the lack of attention to the subject and social support negatively impacts the lives of people with disabilities and their relatives as well. In an exploratory study, it was perceived a trend towards the depreciation regarding this theme, instead of the construct...
As deficiências estão mais relacionadas a um contexto social do que com condições médicas. No entanto, a falta de atenção ao assunto e de suporte social impactam negativamente na vida das pessoas com deficiência e seus familiares. Em um estudo exploratório percebeu-se uma tendência à depreciação dos deficientes em detrimento da construção de uma re...
Investments in public health had an increase of about R$ 20 bi in recent years. Even with the dynamism of the Unique Health System (SUS), only after 13 years the criteria and parameters for the planning and programming of health services have been updated. The calculations for health resources division are complex due to the nature of the SUS admin...
The internet development and the consequent change in communication forms have strengthened as online social networks, increasing the involvement of people with this media and making consumers of products and services, which are more informed and demanding for companies. This context has given rise to Social CRM, which can be put into practice by m...
Online social networks have changed the ways of communication and social interactions, especially in the Customer Relationship Management (CRM). In this sense, a new concept about business strategies involving CRM and social media has aroused, known as Social Customer Relationship Management. Despite to be emergent and promising, it was perceived t...
Os investimentos em saúde pública tiveram um aumento de cerca de 20 bilhões
de reais nos últimos anos. Mesmo com a dinamicidade do Sistema Único de Saúde (SUS),
apenas após 13 anos os critérios e parâmetros para o planejamento e programação de ações e serviços de saúde foram atualizados. Os cálculos para divisão de recursos de saúde são complexos d...
New sequencing technologies such as Illumina/Solexa, SOLiD/ABI, and 454/Roche, revolutionized the biological researches. In this context, the SOLiD platform has a particular sequencing type, known as multiplex run, which enables the sequencing of several samples in a single run. It implies in cost reduction and simplifies the analysis of related sa...
The ways of relationship between companies and customers have changed dramatically due to web-users engagement with Online Social Networks, impacting on the way consumers make purchase decisions. As a consequence, this phenomenon brought up a new concept, the Social Customer Relationship Management. In this context, Electronic Word-of-Mouth plays a...
Online Social Networks are more than a source of large amounts of data, but a potential treasure for companies and institutions that seek information about how they are perceived by their audience. Sentiment Analysis (SA) is a technique that allows the automatic mining of opinions, which can be applied in this context. However, such approach faces...
Figura 1: Cenário da primeira fase-comunidade de Jamaraquá. RESUMO É crescente a busca por novas metodologias de ensino que tenham um elevado nível de engajamento dos alunos. Neste sentido, a utilização de jogos eletrônicos vem sendo investigados como ferramenta de fomento à participação dos alunos, atraindo cada vez mais o interesse destes para o...
Presentation of the paper entitled Opinion Label: A Gamified Crowdsourcing System for Sentiment Analysis Annotation made in WFA´17, a workshop inside the WebMedia´2017.
Daily, a big data of media, thoughts and opinions can be noticed on Online Social Networks (OSN), resulting from their user’s interaction and sharing of information. In Brazil, this is strongly observed, as Brazilians are often active on the Internet. The business and academic communities around the world are aware of these events, due their possib...
The ways of communication and social interactions are changing and web users are becoming increasingly engaged with Online Social Networks (OSN). This fact has significantly impact in the relationship mechanisms between companies and customers. Thus, a new approach to perform Customer Relationship Management (CRM) is arising, the Social CRM (SCRM)....
The attention on sleep disorders has grown in recent years. Mainly because of the changes imposed by the information and communication Era. These changes have impacted in a hazardous way on our sleep quality. The current mainstream sleep disorder detection and assessment method, the laboratory polysomnography, is very expensive and inconvenient for...
Time series have been used in several applications such as process control, environmental monitoring, financial analysis and scientific researches. However, in the presence of missing data, this study may become more complex due to a strong break of correlation among samples. Therefore, this work proposes an imputation method for time series using...
Time series have been used in several applications such as process control, environment monitoring, financial analysis and scientific researches. However, in the presence of missing data, this study may become more complex due to a strong break of correlation among samples. Therefore, this work proposes an imputation method for time series using Ge...
Data analysis plays an important role in our Information Era; however, most of statistical and machine learning algorithms were not developed to tackle the ubiquitous issue of missing values. In pattern classification, several strategies have been proposed to handle this problem, where missing data imputation is the most used one, which can be view...
Sleep disorders affect approximately 30% of the adult population , due to this fact, it is considered an important public health issue. Some medical conditions are correlated with sleep disturbances, including: obesity, diabetes, cardiovascu-lar disease, hyperactivity disorder and early mortality. The current mainstream sleep disorder detection and...
