Considering Human Aspects on Strategies for Designing and Managing Distributed Human Computation

A human computation system can be viewed as a distributed system in which the processors are humans, called workers. Such systems harness the cognitive power of a group of workers connected to the Internet to execute relatively simple tasks, whose solutions, once grouped, solve a problem that systems equipped with only machines could not solve satisfactorily. Examples of such systems are Amazon Mechanical Turk and the Zooniverse platform. A human computation application comprises a group of tasks, each of them can be performed by one worker. Tasks might have dependencies among each other. In this study, we propose a theoretical framework to analyze such type of application from a distributed systems point of view. Our framework is established on three dimensions that represent different perspectives in which human computation applications can be approached: quality-of-service requirements, design and management strategies, and human aspects. By using this framework, we review human computation in the perspective of programmers seeking to improve the design of human computation applications and managers seeking to increase the effectiveness of human computation infrastructures in running such applications. In doing so, besides integrating and organizing what has been done in this direction, we also put into perspective the fact that the human aspects of the workers in such systems introduce new challenges in terms of, for example, task assignment, dependency management, and fault prevention and tolerance. We discuss how they are related to distributed systems and other areas of knowledge.Comment: 3 figures, 1 tabl

Modos de aquisição, utilização e descarte de viaturas policiais militares : um estudo sobre a possibilidade de melhora no processo

Orientador : Prof. Dr. Armando João Dalla Costa.Monografia (especialização) - Universidade Federal do Paraná, Setor de Ciências Sociais Aplicadas, Curso de Especialização em Gestão PúblicaInclui referênciasResumo : Este trabalho traz uma proposta para aquisição de viaturas policiais buscando uma economia nas aquisições em que as mesmas são compradas já com equipamentos e caracterização, o que acarreta um valor muito acima do mercado para esses veículos, com essa proposta se busca a aquisição dos veículos com o valor de mercado e sem a caracterização citada, além de desconto referente ao ICMS o que traria grande economia para os cofres públicos, sendo que seriam utilizados os equipamentos já instalados em viaturas usadas. Outro ponto é a compra de veículos do mesmo modelo dos que a corporação já possui neste caso sendo dispensável a licitação

Privacy-Aware Recommender Systems Challenge on Twitter's Home Timeline

Recommender systems constitute the core engine of most social network platforms nowadays, aiming to maximize user satisfaction along with other key business objectives. Twitter is no exception. Despite the fact that Twitter data has been extensively used to understand socioeconomic and political phenomena and user behaviour, the implicit feedback provided by users on Tweets through their engagements on the Home Timeline has only been explored to a limited extent. At the same time, there is a lack of large-scale public social network datasets that would enable the scientific community to both benchmark and build more powerful and comprehensive models that tailor content to user interests. By releasing an original dataset of 160 million Tweets along with engagement information, Twitter aims to address exactly that. During this release, special attention is drawn on maintaining compliance with existing privacy laws. Apart from user privacy, this paper touches on the key challenges faced by researchers and professionals striving to predict user engagements. It further describes the key aspects of the RecSys 2020 Challenge that was organized by ACM RecSys in partnership with Twitter using this dataset.Comment: 16 pages, 2 table

Comportamiento agronómico y productivo del Botón de oro (Tithonia diversifolia) en tres edades de corte en la Granja Mishilí, Santo Domingo de los Tsáchilas.

The button of gold (Tithonia diversifolia), is one of the most important forage resources in animal feed, and so the following research work aimed to evaluate the agronomic and productive behavior of the button of gold (Tithonia diversifolia) in three cutting ages study conducted at the Experimental Farm Mishilí belonging to the Instituto Superior Tecnológico Tsa'chila in the province of Santo Domingo de los Tsáchilas, where different agronomic and productive variables were evaluated, establishing a field trial where 3 treatments corresponding to different cutting ages were applied: 50, 60 and 70 days, with 7 replications for each treatment. Agronomic parameters such as plant height, number of leaves/plant, leaf width, leaf length, stem thickness, root biomass production and aerial biomass production were recorded. The results showed significant differences in yield and agronomic characteristics in buttercup (Tithonia diversifolia). This suggests the importance of selecting the optimum cutting age to maximize production and improve the nutritional quality of buttercup (Tithonia diversifolia) as an agricultural resource, being the best for this case at 70 days, where the following results were obtained: plant length 292.57 cm, root length 47.43 cm, leaf width 19.89 cm, leaf length 28.40 cm.El botón de oro (Tithonia diversifolia), es uno de los recursos forrajeros más importantes dentro de la alimentación animal, y es así que el siguiente trabajo de investigación tuvo como objetivo evaluar el comportamiento agronómico y productivo del botón de oro (Tithonia diversifolia) en tres edades de corte estudio realizado en la Granja Experimental Mishilí perteneciente al Instituto Superior Tecnológico Tsa´chila en la provincia de Santo Domingo de los Tsáchilas, donde se evaluaron diferentes variables agronómicas y productivas, estableciendo un ensayo de campo donde se aplicaron 3 tratamientos correspondientes a diferentes edades de corte: 50, 60 y 70 días, con 7 repeticiones por cada tratamiento. Se registraron parámetros agronómicos como altura de la planta, numero de hojas/plantas, ancho de hoja, longitud de hoja, grosor del tallo, producción de biomasa radicular, producción de biomasa aérea. Los resultados mostraron diferencias significativas en el rendimiento y características agronómicas en el botón de oro (Tithonia diversifolia). Esto sugiere la importancia de seleccionar la edad óptima de corte para maximizar la producción y mejorar la calidad nuticional del botón de oro (Tithonia diversifolia) como recurso agrícola, siendo la mejor para este caso a los 70 días dónde se obtuvieron los siguientes resultados, longitud de planta 292,57 cm, longitud de raíz 47,43 cm, ancho de hoja 19,89 cm, longitud de hoja 28,40 c

Conditions of child health stricken by cerebral palsy in Family Health Strategy

Objective: To investigate the child's health condition with cerebral palsy accompanied in the Family Health Strategy. Method: Descriptive, exploratory and cross-sectional study, conducted with 13 children 1-12 years old. Through home visits investigating socioeconomic and health conditions, physical examination, vital signs, pneumofuncional evaluation and testing of the gross motor function classification system. Results: The majority of children a family income of up to 2 minimum wages, are benefited by the National Institute of Social Security, use the services of the National Health System also submitted respiratory function unchanged, growth putting structural suitable for age, prevalence of quadriparesia spastic, use of anticonvulsant medication, respiratory problems last year as influenza and pneumonia. Conclusion: It was observed that the higher the motor impairment developed more comorbidities. Children with cerebral palsy accompanied by the Family Health Program in Teresina, PI, are in proper health

Faixas críticas de teores foliares de micronutrientes em mudas de cafeeiro (Coffea arabica L.)

The objective of this work was to quantify the leaf micronutrient levels in coffee seedlings, to establish critical ranges in the experiment carried out in Federal University of Lavras, from May/2002 to January/2003. A random block design was arranged in a 6 x 4 factorial scheme (six fertilization levels and four sampling times), with four replications (nine plants were evaluated per plot). The evaluations were performed when the seedlings reached the stages of 3, 4, 5 and 6 pairs of leaves. The fertilization levels used were: 25%, 50%, 75%, 100%, 125%, and 150% with standard substrate). The following characteristics were evaluated: plant height, shoot diameter, leaf area, root dry weight, shoot  and leaf dry weight's, and chemical analysis of the leaves to quantify the B, Cu, Fe, Mn, and Zn levels. To determine the critical ranges, the most adequate mathematical model to the fertilization levels in relation to plant performance was selected. For this purpose, where there was a significant effect of the fertilization level and of the interaction between time and fertilization level, regression analyses of each characteristic evaluated in each sampling time were performed. The same process was applied to the leaf micronutrient levels found in leaf dry weight, interpolated with the fertilization levels. Then the regression equations set for each characteristic in each sampling time were derived to determine the point of maximum performance. Using the equations it was possible to identify the ranges of the fertilization substrate levels that provided a maximum performance above 90% in the plants. These fertilization levels were substituted in the regression equations of the leaf micronutrient levels in each sampling time to find the critical range of micronutrients (mg/kg) : boron (39,74 to 39,94), copper (6,94 to 9,29), iron (209,01 to 213,88), manganese (33,05 to 37,21), zinc (3,68 to 4,08). The optimum stage to harvest leaves is four pairs of leaves.Objetivou-se quantificar e estabelecer faixas críticas de micronutrientes em folhas de mudas de cafeeiro em experimento conduzido na Universidade Federal de Lavras, de maio de 2002 a janeiro de 2003. Utilizou-se blocos ao acaso, esquema fatorial 6 x 4, (6 níveis de adubação e 4 épocas de amostragem), com 4 repetições (9 plantas úteis na parcela). As avaliações foram realizadas com mudas de 3, 4, 5 e 6 pares de folhas verdadeiras. Os níveis de adubação utilizados foram 25, 50, 75, 100, 125 e 150% do substrato padrão. Avaliaram-se: altura de plantas, diâmetro do caule, área foliar, massa seca da raiz, caule, folhas e total e análises químicas foliares para identificação dos teores de B, Cu, Fe, Mn e Zn. Para determinação das faixas críticas encontraram-se modelos matemáticos que adequassem os níveis de adubação à performance das plantas. Quando níveis de adubação e interação de época e níveis de adubação foram significativos, realizou-se análises de regressão para cada característica e época de amostragem. O mesmo feito para teores de micronutrientes na matéria seca das folhas, interpolados com níveis de adubação. Derivou-se equações de cada característica por época, encontrando-se o ponto de máxima performance. Identificou-se faixas dos níveis de adubação, que proporcionaram acima de 90% da performance máxima substituindo-os nas equações em cada época, encontrando-se as faixas críticas (mg/kg): boro (39,74 a 39,94), cobre (6,94 a 9,29), ferro (209,01 a 213,88), manganês (33,05 a 37,21), zinco (3,68 a 4,08). A coleta de folhas deve ser no estádio de 4 pares

An Integrated Big and Fast Data Analytics Platform for Smart Urban Transportation Management

(c) 20xx IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.[EN] Smart urban transportation management can be considered as a multifaceted big data challenge. It strongly relies on the information collected into multiple, widespread, and heterogeneous data sources as well as on the ability to extract actionable insights from them. Besides data, full stack (from platform to services and applications) Information and Communications Technology (ICT) solutions need to be specifically adopted to address smart cities challenges. Smart urban transportation management is one of the key use cases addressed in the context of the EUBra-BIGSEA (Europe-Brazil Collaboration of Big Data Scientific Research through Cloud-Centric Applications) project. This paper specifically focuses on the City Administration Dashboard, a public transport analytics application that has been developed on top of the EUBra-BIGSEA platform and used by the Municipality stakeholders of Curitiba, Brazil, to tackle urban traffic data analysis and planning challenges. The solution proposed in this paper joins together a scalable big and fast data analytics platform, a flexible and dynamic cloud infrastructure, data quality and entity matching algorithms as well as security and privacy techniques. By exploiting an interoperable programming framework based on Python Application Programming Interface (API), it allows an easy, rapid and transparent development of smart cities applications.This work was supported by the European Commission through the Cooperation Programme under EUBra-BIGSEA Horizon 2020 Grant [Este projeto e resultante da 3a Chamada Coordenada BR-UE em Tecnologias da Informacao e Comunicacao (TIC), anunciada pelo Ministerio de Ciencia, Tecnologia e Inovacao (MCTI)] under Grant 690116.Fiore, S.; Elia, D.; Pires, CE.; Mestre, DG.; Cappiello, C.; Vitali, M.; Andrade, N.... (2019). An Integrated Big and Fast Data Analytics Platform for Smart Urban Transportation Management. IEEE Access. 7:117652-117677. https://doi.org/10.1109/ACCESS.2019.2936941S117652117677

Integral transform of MHD flow with heat and mass transfer of a biofluid in a parallel plate channel / Transformação integral do escoamento MHD com transferência de calor e massa de um biofluido em um canal de placa paralela

Foi estudado o escoamento transiente pulsátil através de um canal poroso do tipo Darcy-Forchheimer de um biofluido influenciado por um campo magnético externo aplicado transversalmente ao canal com reação química. Na formulação matemática foi considerado o escoamento laminar, bidimensional, incompressível de um fluido eletricamente condutor, através de um meio poroso, dentro de um canal formado entre placas planas paralelas com transpiração da parede. Os campos de velocidade, concentração e temperatura foram solucionados utilizando a Técnica da Transformada Integral Generalizada (GITT) e foi realizada uma análise de convergência das expansões em série, obtendo convergências satisfatórias com poucos termos nos somatórios. As soluções obtidas foram comparadas com as da literatura obtendo-se uma boa concordância em todos os campos e situações estudadas. Foi avaliada ainda a influência do número de Reynolds, do número de Prandtl, do número de Schmidt e do parâmetro magnético nos perfis de velocidade, temperatura e concentração, observando-se que o escoamento é fortemente sensível aos efeitos do número de Reynolds e do parâmetro magnético. Uma análise transiente também foi realizada observando que devido ao fluido estar em repouso no início, ele não é imediatamente acelerado, gerando um retardo no perfil de velocidade para tempos pequenos.