1,354 research outputs found

    Automatic offensive language detection from Twitter data using machine learning and feature selection of metadata

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    The popularity of social networks has only increased in recent years. In theory, the use of social media was proposed so we could share our views online, keep in contact with loved ones or share good moments of life. However, the reality is not so perfect, so you have people sharing hate speech-related messages, or using it to bully specific individuals, for instance, or even creating robots where their only goal is to target specific situations or people. Identifying who wrote such text is not easy and there are several possible ways of doing it, such as using natural language processing or machine learning algorithms that can investigate and perform predictions using the metadata associated with it. In this work, we present an initial investigation of which are the best machine learning techniques to detect offensive language in tweets. After an analysis of the current trend in the literature about the recent text classification techniques, we have selected Linear SVM and Naive Bayes algorithms for our initial tests. For the preprocessing of data, we have used different techniques for attribute selection that will be justified in the literature section. After our experiments, we have obtained 92% of accuracy and 95% of recall to detect offensive language with Naive Bayes and 90% of accuracy and 92% of recall with Linear SVM. From our understanding, these results overcome our related literature and are a good indicative of the importance of the data description approach we have used

    CONTRIBUIÇÕES DO GERENCIAMENTO DE PROCESSOS DE NEGÓCIOS PARA A GESTÃO DO CONHECIMENTO EM INSTITUIÇÕES PÚBLICAS DE SANTA CATARINA

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    This work aimed to analyze how the activity of the Process Management Centers (NUPROCs) in the State of Santa Catarina contributes to Knowledge Management (KM) by making explicit organizational processes during the mapping of business processes. The work points to significant improvements in labor dynamics based on the mapping of the organizations' business processes. It also indicates that knowledge management tends to consolidate itself as a contributory element in the development of work in the public institutions surveyed. In addition to these, the work points out that new technologies are already part of the routine of the public institutions surveyed and that their wide application should be expanded and deepened in the numerous activities carried out in these organizations. Methodologically, the study is classified as exploratory, qualitative-quantitative with the use of a questionnaire.Este trabajo tuvo como objetivo analizar cómo la actividad de los Centros de Gestión de Procesos (NUPROCs) en el Estado de Santa Catarina contribuye a la Gestión del Conocimiento (GC) al hacer explícitos los procesos organizacionales durante el mapeo de los procesos de negocio. El trabajo apunta a mejoras significativas en la dinámica laboral a partir del mapeo de los procesos de negocio de las organizaciones. También indica que la gestión del conocimiento tiende a consolidarse como un elemento coadyuvante en el desarrollo del trabajo en las instituciones públicas encuestadas. Además de éstas, el trabajo señala que las nuevas tecnologías ya forman parte de la rutina de las instituciones públicas encuestadas y que se debe ampliar y profundizar su amplia aplicación en las numerosas actividades que se desarrollan en estas organizaciones. Metodológicamente, el estudio se clasifica como exploratorio, cualitativo-cuantitativo con el uso de un cuestionario.Este trabalho teve por objetivo analisar como a atividade dos Núcleos de Gerenciamento de Processos de Negócio (NUPROCs) do Estado de Santa Catarina contribui para a Gestão do Conhecimento (GC) ao explicitar processos organizacionais durante o mapeamento de processos de negócio. O trabalho aponta melhoras significativas das dinâmicas laborais a partir do mapeamento dos processos de negócio das organizações. Indica também que a gestão do conhecimento tende a se consolidar como elemento contributivo no desenvolvimento laboral nas instituições públicas pesquisadas. Além desses, o trabalho aponta que as novas tecnologias já fazem parte da rotina das instituições públicas pesquisadas e que sua ampla aplicação deve ser ampliada e aprofundada nas inúmeras atividades executadas nessas organizações. Metodologicamente, o estudo é classificado como exploratório, qualitativo-quantitativo com o emprego de questionário.Este trabalho teve por objetivo analisar como a atividade dos Núcleos de Gerenciamento de Processos de Negócio (NUPROCs) do Estado de Santa Catarina contribui para a Gestão do Conhecimento (GC) ao explicitar processos organizacionais durante o mapeamento de processos de negócio. O trabalho aponta melhoras significativas das dinâmicas laborais a partir do mapeamento dos processos de negócio das organizações. Indica também que a gestão do conhecimento tende a se consolidar como elemento contributivo no desenvolvimento laboral nas instituições públicas pesquisadas. Além desses, o trabalho aponta que as novas tecnologias já fazem parte da rotina das instituições públicas pesquisadas e que sua ampla aplicação deve ser ampliada e aprofundada nas inúmeras atividades executadas nessas organizações. Metodologicamente, o estudo é classificado como exploratório, qualitativo-quantitativo com o emprego de questionário

    Lean Manufacturing in the context of Industry 4.0: a bibliometric study of world academic production published in journals indexed in the Scopus and Web of Science

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    Lean systems are used by industries that aim to improve their competitiveness through greater flexibility, lower costs, improvements in product quality and customer satisfaction. Industry 4.0 includes intelligent components and machines, integrated into a common digital network where flexible, powerful, and accessible microcontrollers are the main technology. Although Lean Manufacturing contrasts with some fundamentals of Industry 4.0, several studies have been carried out regarding the integration between these two areas. Through bibliometrics, this paper aims to investigate the advancement of scientific knowledge on the topic. For achieving this goal, documents published in journals indexed in the Scopus and Web of Science were analyzed. Among the results obtained, it is important to highlight the International Journal of Production Research, IFAC Papersonline and Procedia Manufacturing as the main sources; 41 countries published research on the topic, with Italy, Brazil, Germany, China, United States, United Kingdom, India and Spain among the most prolific; and, among the technologies and solutions related to the Industry 4.0, the Internet of Things and Cyber Physical Systems Ciber-Físicos are the most recurrent topics in the papers

    SIGNIFICADOS, INTERPRETAÇÕES E EXPECTATIVAS SOBRE A RESPONSABILIDADE SOCIAL CORPORATIVA: Uma Análise Crítica do Discurso

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    A partir do paradigma malthusiano, surge a perspectiva de que as empresas precisam assumir um papel mais amplo e responsável perante a sociedade. Assim, o estudo da responsabilidade social corporativa emerge como uma temática bastante recorrente no âmbito organizacional nas últimas décadas. O objetivo desse trabalho foi analisar as atitudes de empresários/executivos, políticos/representantes do poder público e representantes de organizações não governamentais (ONGs) no Rio de Janeiro sobre Responsabilidade Social Corporativa e explorar significados, interpretações e expectativas quanto às suas práticas. Com uma base teórica predominante de Responsabilidade Social em contraposição a outra menos ingênua, este artigo engaja-se na construção de uma análise que conclui pela necessidade de limites da ação organizacional e existência de uma pluriversalidade do conhecimento sobre desenvolvimento e administração/gestão.

    Asparaginase induces selective dose- and time- dependent cytotoxicity, apoptosis, and reduction of NFκB expression in oral cancer cells

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    Asparaginase is fundamental to the treatment of haematological malignancies. However, little has been studied on the effects that asparaginase could exert on solid tumours. Thus, this study aimed to evaluate the effects of asparaginase on an oral carcinoma cell line. The cytotoxicity of asparaginase in SCC- 9 (tongue squamous cell carcinoma) and HaCaT (human keratinocyte) cell lines was evaluated with MTT cell viability assay. The cells were treated with asparaginase at 0.04, 0.16, 0.63, 1.0, 1.5, 2.5, and 5.0 IU/mL. Dose- response curves and IC50 values were obtained and the Tumour Selectivity Index (TSI) was calculated. The effect of asparaginase on procaspase- 3 and nuclear factor κB (NFκB) expression was evaluated with western blot because it was reported that the overexpression of NFκB has been shown to contribute to tumour cell survival, proliferation, and migration. Caspase 3/7 staining was performed to identify cell death using flow cytometry. Effective asparaginase concentrations were lower for SCC- 9 cells when compared to HaCaT cells. The cytotoxicity results at 48 and 72 hours were significantly different for SCC- 9 cells. The TSI indicated that asparaginase was selective for the tumour cells. A decrease in procaspase- 3 and NFκB protein levels was observed in SCC- 9 cells. Furthermore, asparaginase resulted in significant apoptosis after 48 and 72 hours. Based on these results, asparaginase was cytotoxic in a dose- and time- dependent manner, induces apoptosis, and reduces NFκB expression in oral cancer cells. These results encourage further studies on the effectiveness of this enzyme as a treatment for solid tumours, especially head and neck cancer.Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/154950/1/cep13256.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/154950/2/cep13256_am.pd

    Distribuição espacial da pressão na lateral de um pivô central com base em um modelo digital de elevação (MDE)

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    The spatial distribution of pressure head values along a 432,6m long center pivot lateral line was determined using measured values, taken at the inlet and end sections of the lateral line, and combined with topographic elevation data from a SRTM (Shuttle Radar Topography Mission) image. Data furnished by SRTM describes topographic elevation values along the wheel tracks of each one of the eight towers used for the sustentation of the center pivot lateral line. For validation purposes of the process used for the determination of the pressure head distribution along the lateral line length, on 18 angular positions equally spaced along a complete turn of the lateral line, values of pressure head were also measured on 6 distinct points of the lateral line. Differences, on a 5% signiï¬cance level for the student t means test, were observed when measured values were compared to pressure head values estimated based on SRTM's altitude data. After the creation of thematic maps, there was a coincidence in the positioning of the regions of occurrence of the highest of pressure head, also, the lower pressure head values. The study demonstrates that the use of elevation data from SRTM images is acceptable only for the elaboration of thematic maps destined to delimit within the irrigated area the occurrence of regions where different pressure head values prevailed.A distribuição espacial da carga de pressão ao longo dos 432,6m de comprimento de uma linha lateral de um pivô central foi determinada a partir de valores medidos, na entrada e na extremidade da linha lateral, e combinados com dados de altitude proveniente de uma imagem SRTM do rastro das oito torres de sustentação da linha lateral. Para fins de validação da estimativa da distribuição espacial da carga de pressão na linha lateral móvel, em 18 diferentes posições angulares, foram medidos valores de carga de pressão em seis pontos distintos do seu comprimento. Diferenças significativas, ao nível de 5% do teste de médias “t de student”, foram observadas quando valores de carga de pressão estimados com dados de altitude do SRTM foram comparados com os valores medidos em campo. Após a confecção de mapas temáticos verificou-se coincidência no posicionamento das regiões de ocorrência dos valores mais elevados, como também dos menores valores de carga de pressão. O estudo demonstrou que o uso de dados de elevação a partir de imagens SRTM é aceitável apenas para a elaboração de mapas temáticos destinados a delimitar dentro da área irrigada a ocorrência de regiões onde prevaleceram valores de pressão distintos

    Remoção de matéria orgânica natural em águas usando cavitação hidrodinâmica e peróxido de hidrogênio (CH-H2O2)

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    The presence of natural organic matter (NOM) in water does not present direct risk to the human body or to the environment. However, its presence along with other pollutants can lead to countless issues and damage human health and the environment. The hydrodynamic cavitation (HC) phenomenon started being used in the early 21st century as a process capable of treating supply-water and wastewater based on pollutant and pathogen degradation. Process effectiveness increases when it is combined to chemical agents, creating an advanced oxidation process (AOP). Although several studies have presented broaden applications for the HC process, its use for NOM removal from supply-water was not yet assessed; therefore, it remains a gap in scientific knowledge. The aim of the current study is to assess HC potential in NOM removal. In order to do so, the experiments were carried out in bench scale hydrodynamic cavitation system operated at batch model within 15-min duration period-of-time. In addition, decantation experiments (24-h period-of-time) were performed in order to check HC influence on molecules found in reaction medium after the exposure of NOM to the phenomenon. NOM was produced by a synthetic humic acid (HA) matrix at fixed concentration of 100 ppm. In total, 16 experiments were carried out; each experiment was featured by the following pair: pH (2.6, 3.0, 3.5 and 5.5) and hydrogen peroxide (0, 1, 5 and 30 mL). The best removal efficiencies (34%-36%) were observed in the most acidic pH ranges (2.6-3.0) at H2O2 concentration of 15mL. Results have presented high NOM removal efficiency (approximately 90%) after decantation at the most acidic pH ranges, as well. It can be explained by the fact that hydrodynamic cavitation in acid solution can break molecular structures suspended in the liquid medium, which favors decantation. Based on the present study, hydrodynamic cavitation with hydrogen peroxide addition can remove NOM from water; moreover, pH control is an essential factor for process development.A presença de matéria orgânica natural (MON) em águas não apresenta riscos diretos relacionados ao seu contato com o organismo humano e nem mesmo ao meio ambiente. Entretanto, sua presença, em conjunto a outros poluentes, pode acarretar inúmeros problemas e danos à saúde humana e ao meio ambiente. O fenômeno de cavitação hidrodinâmica (CH) passou a ser utilizado no início do século XXI como um processo capaz de realizar o tratamento de águas de abastecimento ou residuárias a partir da degradação de poluentes e patógenos. A efetividade do processo aumenta quando aliado à adição de agentes químicos no meio reacional, configurando um processo oxidativo avançado (POA). Por mais que diversos trabalhos apresentem amplas aplicações para o processo de CH, sua utilização para remoção de MON de águas de abastecimento ainda não foi avaliada e, portanto, apresenta-se como uma lacuna no conhecimento científico. O objetivo deste trabalho é avaliar o potencial da CH em remover MON. Para tanto, os experimentos foram realizados em um sistema de cavitação hidrodinâmica, em escala de bancada, operado em modo batelada com duração de 15 minutos. Adicionalmente, experimentos de decantação (período de 24 horas) foram conduzidos com intuito de verificar a influência da CH sobre as moléculas presentes no meio reacional após exposição ao fenômeno. A MON foi constituída por uma matriz de ácido húmico (AH) sintética à uma concentração fixa de 100 ppm. No total foram realizados 16 experimentos, no qual cada experimento foi caracterizado pelo par: pH (2,6; 3,0; 3,5; e 5,5) e peróxido de hidrogênio (0; 1; 15 e 30 mL). As melhores eficiências de remoção (34-36%) foram encontradas para faixas de pH mais ácidas (2,6-3,0), para uma concentração de 15 mL de H2O2. Após decantação, os resultados apresentaram uma elevada eficiência de remoção de MON (aproximadamente 90%), também para faixas de pH mais ácidas. Isso pode ser explicado pelo fato de que, em soluções ácidas, a cavitação hidrodinâmica consegue romper estruturas moleculares suspensas no meio líquido, favorecendo a decantação. Este estudo mostrou que a cavitação hidrodinâmica aliada a peróxido de hidrogênio é capaz de remover MON presentes em águas e que o controle do pH é fator crucial para o desempenho do processo

    Remoção de matéria orgânica natural em águas usando cavitação hidrodinâmica e peróxido de hidrogênio (CH-H2O2)

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    The presence of natural organic matter (NOM) in water does not present direct risk to the human body or to the environment. However, its presence along with other pollutants can lead to countless issues and damage human health and the environment. The hydrodynamic cavitation (HC) phenomenon started being used in the early 21st century as a process capable of treating supply-water and wastewater based on pollutant and pathogen degradation. Process effectiveness increases when it is combined to chemical agents, creating an advanced oxidation process (AOP). Although several studies have presented broaden applications for the HC process, its use for NOM removal from supply-water was not yet assessed; therefore, it remains a gap in scientific knowledge. The aim of the current study is to assess HC potential in NOM removal. In order to do so, the experiments were carried out in bench scale hydrodynamic cavitation system operated at batch model within 15-min duration period-of-time. In addition, decantation experiments (24-h period-of-time) were performed in order to check HC influence on molecules found in reaction medium after the exposure of NOM to the phenomenon. NOM was produced by a synthetic humic acid (HA) matrix at fixed concentration of 100 ppm. In total, 16 experiments were carried out; each experiment was featured by the following pair: pH (2.6, 3.0, 3.5 and 5.5) and hydrogen peroxide (0, 1, 5 and 30 mL). The best removal efficiencies (34%-36%) were observed in the most acidic pH ranges (2.6-3.0) at H2O2 concentration of 15mL. Results have presented high NOM removal efficiency (approximately 90%) after decantation at the most acidic pH ranges, as well. It can be explained by the fact that hydrodynamic cavitation in acid solution can break molecular structures suspended in the liquid medium, which favors decantation. Based on the present study, hydrodynamic cavitation with hydrogen peroxide addition can remove NOM from water; moreover, pH control is an essential factor for process development
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