bluuebunny/crossref_metadata_2025 huggingface dataset:
El prosumidor en la economía colaborativa: nueva manera de participar en el mercado de consumo
Authors: Arribas Urrutia Amaia , Islas Carmona Octavio
Published: May 2021

El concepto de prosumidor puede ser comprendido como un articulador entre la comunicología, anclada en la comprensión de los medios de comunicación tradicionales, y una comunicología transformada, encaminada al estudio de las comunicaciones en los ambientes digitales. Si bien el concepto de prosumidor pareciera que ha ido perdiendo el sentido de utilidad y actualidad en el imaginario comunicológico, estudios realizados por Interactive Advertising Bureau (IAB) reconocen que los nuevos actores digitales han actualizado y extendido la figura del prosumidor hacia un nuevo escenario en el campo de la economía colaborativa, siendo ahora su figura una pieza fundamental. Esta situación supone una profunda reflexión para el comunicólogo, que advierte un escenario de producción de contenidos, servicios y productos nunca antes visto. De esta manera, nos encontramos con la necesidad de analizar el concepto de prosumidor desde una nueva perspectiva que supone complejidad, interdisciplinaridad y sentido holístico. Por ello, el objetivo de este texto es evidenciar la vigencia del concepto renovado del prosumidor, insertado en el imaginario de la economía colaborativa.
Relationship Between Banking Performance and Financial Distress: A Study on Banks of Bangladesh
Authors: Khan Ajaan Rahman , Gupta Chinmoy Das , Ashraf Md. Ali
Published: May 2021

Banking is said to be one of the most successful industries in the economy of Bangladesh. The aim of this study is to check the existence of a relationship between the financial strength (or distress), measured through Altman Z-score, and banking performance, measured using Return of Equity (ROE), of the banks of Bangladesh listed in the Dhaka Stock Exchange (DSE). The paper thoroughly analyzes and describes the data associated with these two variables, and a linear regression has been conducted between these two variables to ascertain the level and direction of their relationship. The trends of Z-score over the five years from 2015 to 2019 (inclusive) have been tested. The analysis discloses that the z-score is a statistically significant predictor of the ROE in the banking industry. Although, the industry shows a low level of Z-score indicating a high level of financial distress among the banks studied, this study implies that an increase in Z-score will result in an increase of ROE.
Analisando emoções através de ação de comunicação sobre o descarte e o uso de copos plásticos
Authors: D'Agostin Andressa , De Medeiros Janine Fleith , Giacomini Ana Cristina Vendrametto Varrone
Published: May 2021

A prevenção da geração de resíduos, principalmente os plásticos de uso único, configura-se atualmente como uma questão crítica. Este trabalho tem por objetivo principal analisar a percepção de estudantes frente a diferentes peças publicitárias que visam à promoção de comportamento pró-ambiental a partir de diferentes apelos emocionais. Para alcançá-lo, os alunos foram expostos às peças propostas e, posteriormente, os dados foram analisados através de estatística descritiva e análise de variância. Os resultados mostram que a preocupação ambiental é o fator mais apelativo e sensibilizador para a maioria dos estudantes. Além disso, a idade e a área de conhecimento do curso dos respondentes mostraram ter influência na escolha das peças. Esta pesquisa permitiu concluir que atuar diretamente sobre as vertentes de emoção e intenção é um passo essencial para a indução de comportamentos mais pró-ambientais. Suas contribuições reincidem sobre a área da psicologia ambiental, com aplicações na área de marketing e comportamento do consumidor, sendo contextualizadas em estruturas teóricas que sugerem vários caminhos para futuras pesquisas.
Loves Me or Loves Me Not? Passing through the Forest of Love Symbols and Unveiling Its Social Nature
Authors: Yeh Hsin-Yi
Published: May 2021

This article unveils how love, as a signified, can be constituted by the artificially constructed symbolic signs (“signifiers”) represented in our everyday life. Only when we regard love as a symbolic system and try to decipher its meanings can we understand how love is transmitted through sociomental patterns. This article attempts to provide examples from language, symbolic materials, the imprinted body, the code of temporality, and the spatial aspect to interpret the general elements that commonly form the forest of love symbols. Moreover, this article introduces cognitive sociology as a significant analytic approach to examining love. On the one hand, taking the “semantic square” proposed by Zerubavel, I articulate that when we want to understand the meanings of symbols, we usually have to embed them into their symbolic context. On the other hand, based on the distinction between marked and unmarked social categories proposed by Brekhus, I explain that more often than not, we can shed light on the marked love types even when we focus on love issues. Last, this article reminds us that the symbols of love are not fixed and constant but change according to the transformations of context.
Wood Quality Characterization of Sycamore Maple (Acer pseudoplatanus L.) and its Utilization in Wood Products Industries
Authors: Sedlar Tomislav , Šefc Bogoslav , Stojnić Srđan , Sinković Tomislav
Published: May 2021

This study quantified the physical and mechanical properties of sycamore maple (Acer pseudoplatanus L.) as a basis for assessing wood quality. The physical properties of oven-dry density, density at 12% MC, green density, basic density, longitudinal, radial, tangential and volumetric shrinkages were tested and the mechanical properties of bending strength, modulus of elasticity at bending, compression strength parallel to grain and compression strength in radial and tangential direction as well as of Brinell hardness on the cross, radial, and tangential section were determined. Five sycamore maple trees from Medvednica region were selected for the purposes of this research. The results were compared with known literature data on sycamore maple wood, beech wood from the same sight, and beech wood from Gorski Kotar region. For a better understanding of sycamore maple physiology, as well as for assessing the quality of wood products, the distribution of wood properties within the tree radius, from pith to bark, was investigated. There was a general bell shaped distribution, in the radial direction, in wood density, and mechanical properties of sycamore maple wood. Shrinkages decreased from pith to bark, except for tangential shrinkage with bell shaped pattern. All investigated wood densities of sycamore maple from Medvednica were similar to the findings of studies known in literature, as well as shrinkages, except for the lower longitudinal shrinkage. Investigated mechanical properties of sycamore maple wood were similar to the findings of studies known in literature, except for the lower bending strength and modulus of elasticity (MOE). Investigated sycamore maple indicated better dimensional stability than beech wood from two locations in the region, although it did not match the beech wood regarding mechanical properties, especially wood hardness.
Technical and Environmental Impacts of Coal Waste Used as a Soil Stabilizer in Construction Projects of Forest Roads
Authors: Mansouri Sara , Nasiri Mehran , Modarres Amir
Published: May 2021

Many pozzolans are waste products from industrial processes. Every year a huge amount of coal waste is gathered from the coal washing plant in the Hyrcanian forests of Iran. These materials can be used for soil stabilization in construction and maintenance projects of forest roads. This paper aims to (a) investigate the role of coal waste (CW) as a soil stabilizer and (b) determine the changes in soil specification regarding the environmental pollution in different combinations of materials (soil, lime (4 and 6%) and CW (3, 6, 9 and 12%)). For this purpose, different technical and environmental analysis and laboratory tests were performed. Technical tests showed that the soil liquid limit and maximum dry density decreased with an increase in lime and CW contents. Addition of CW could increase the soil CBR, UCS and OMC. According to XRD test, the addition of CW and lime can increase the size of crystals in stabilized soil samples. Environmental analysis showed that the use of stabilizer significantly reduced the concentration of heavy metals such as Cd, Cr and Pb. Also, all of the metal concentrations leached from samples satisfied the required criteria, but the addition of lime and CW increased the concentration of N, P, and K. These changes can increase the invasive species consistent with calcareous soil conditions along the roads. According to the results, the combination of coal waste and lime can be one of the best methods for in situ remediation. It would, however, be better to use a minimum amount of stabilizer in pavement layers of access roads due to environmental sensitivity.
Een kijkje achter de schermen: een kwalitatieve studie over het ontstaan van cybercriminele carrières
Authors: Matthijsse Sifra , van der Wagen Wytske , van ’t Zand Elina , Fischer Tamar
Published: May 2021

A look behind-the-screens: a qualitative study on the initiation of cybercriminal careers

This qualitative study examines how criminal careers in cybercrime start and can be explained. Based on offender and expert interviews, the authors conclude that traditional factors linked with the initiation, such as a maturity gap (for juvenile offenders) and opportunism (for adult offenders), in combination with different types of (online) disinhibition – social, technical, situational and psychological – can explain the start of a criminal career. Features of the digital context appear to play a major role in the development of a criminal career and this requires more online supervision and education about – among other things – legal alternatives and the risks and boundaries of the online environment.
An Analysis of CTMC Stochastic Models with Quarantine on the Spread of Tuberculosis Diseases
Authors: Fatimatuzzahroh Fatimatuzzahroh , Sumarno Hadi , Sianturi Paian
Published: May 2021

The SIQRS epidemic model developed in this study is intended to analyze the spread characteristics of the infectious disease tuberculosis. It is a modification of the SIQR model developed by Cao et al., using a stochastic model called the Continuous Time Markov Chains (CTMC) approach. Further analysis of the SIQRS model was done to determine the transitional probability, the outbreak probability, the expected time until disease extinction and to simulate the effect of quarantine treatment on the expected time until disease extinction. Based on the simulation it can be concluded that a decrease of the healing rate together with an increase of the transmission rate changes the basic reproduction number (R0), the expected number of infected individuals (m), the time until disease extinction, and the outbreak probability. A disease outbreak will occur if both R0>1 and m>1 hold. Also, based on the simulation it was concluded that the decrease of the healing rate and the increase of the transmission rate cause increases of R0 and m. An increase of the quarantine rate reduces the expected time to disease extinction, R0 and m. As a consequence, the disease will gradually disappear from the system.
Otimização da Ferramenta de Monitoramento Zabbix no Hospital Universitário de Santa Maria
Authors: Röpke Vinícius , Guarienti Matheus , Rizzetti Tiago Antonio
Published: May 2021

This article describes the optimization of the Zabbix network monitoring tool at the Hospital Universitário de Santa Maria, where existing servers had been presenting problems generated by the misconfiguration of the tool as a whole. The high amount of network assets monitored by the tool, and the abundance of data collected, slowed the machine, making it difficult to use when necessary. New network assets and locations to be added were analyzed to ensure item history. Thus it is possible to generate reports for statistics, and reduce the computational effort of the tool to bring real-time information of network problems. To solve the problems presented, and obtain concrete data of the environment, it was aimed to optimize the tool itself, reviewing items from each host on the machine, linking templates, adjusting the use of the housekeepinp function (acting to remove unused records in database level), among other processes to improve server performance. This facilitates the use of the tool.
Composição Eficiente de Encadeamento de Funções de Serviços
Authors: Capeletti Igor , Rossi Fabio , Luizelli Marcelo Caggiani
Published: May 2021

Ainda está para ser definido, mas o tema é voltado em Funções de Virtualização de Redes para novas tecnologias de internet.
Uma Investigação sob a Percepção dos Usuários no Desempenho da Rede no IFC - Campus Avançado Sombrio
Authors: Da Rosa Diuliana De Matos , Colares Liliana , Braga Matheus , De Sousa Victor Martins
Published: May 2021

Este trabalho busca realizar um levantamento e análise, a partir da percepção dos usuários de uma instituição de ensino, em relação ao desempenho da rede ao passo que estes são os mais utilizadores do acesso à Internet. A análise se deu através de um questionário preliminar comparando uma rede cabeada com uma rede sem fio. Com base nos resultados, foi analisado que mesmo a Internet sem fio apresentando maior lentidão, os entrevistados consideram a Internet na instituição satisfatória.
Registro de eventos de alocação de contêineres em Blockchain
Authors: Marques Marco , Miers Charles
Published: May 2021

A tecnologia de virtualização baseada em contêineres possibilita sua alocação dinâmica, atendendo a necessidades de escalonamento e tolerância a falhas. Esta característica proporciona maior flexibilidade no uso dos recursos computacionais, mas torna o monitoramento destes um desafio, devido ao grande fluxo de chamadas e alocações. Este artigo propõe uma solução para registro de alocação/desalocação de contêineres baseada em Blockchain. O registro destas operações nos contêineres permite tanto a auditoria dos recursos empregados como a verificação da cronologia das operações realizadas.
Verificação Automática de Protocolos de Segurança com a ferramenta Scyther
Authors: Jenuario Tadeu , Otávio Chervinski João , Paz Giulliano , Kreutz Diego
Published: May 2021

Protocolos de segurança (e.g. Needham-Schroeder, IKE, IPSec, SSH, Kerberos, TLS) representam o alicerce das comunicações do mundo atual. Protocolos como o IKE e o TLS permitem a troca de chaves na internet e propriedades de segurança essenciais para as comunicações (e.g. confidencialidade, integridade e autenticidade). Um dos grandes desafios no projeto desses protocolos é garantir a sua própria segurança, ou seja, garantir que o protocolo seja livre de vulnerabilidades. Atualmente, existem algumas ferramentas desenvolvidas especificamente para a verificação formal automática de protocolos de comunicação e segurança, como a Scyther, CrytoVerif, Tamarin Prover e AVISPA. Entretanto, essas são ainda pouco conhecidas e utilizadas na prática por projetistas de protocolos. Este trabalho tem por objetivo contribuir no fechamento desta lacuna através da introdução e demonstração prática de utilização da ferramenta Scyther, projetada para auxiliar na verificação automática de protocolos de segurança.
Estudo sobre Fake News: modo de operação e como atenuar a sua propagação
Authors: Lima Pablo De Andrades , Cimirro Jean Lucas , Amaral Erico , Munhos Gerson
Published: May 2021

O trabalho apresenta uma revisão literária para buscar, analisar e verificar as formas de disseminação e as tecnologias usadas no combate as notícias falsas. Foram incluídos no estudo, artigos de pesquisa brasileiros sobre o tema, que resultaram na investigação de dois problemas: O uso de robôs sociais/digitais e influência do filtro bolha no direcionamento dos acessos e como parte da solução do problema a verificação das fakes news com uso de deep learning. As pesquisas citadas mostram um tendência promissora de evolução no combate às fake news utilizando o padrão automatizado de machine learning e inteligência humana para diferenciar robôs de pessoas além de outras ações no combate a fake news como fact checking, o uso de leis punitivas e o delicado conflito entre o combate às fake news e o respeito e a liberdade de expressão, onde planos legais nacionais, sob a justificativa de combater notícias falsa possam violar esta autonomia. Após a análise dos artigos enquadrados no escopo da pesquisa, pode-se verificar a dificuldade no tratamento de notícias falsas nos meios digitais atuais como redes sociais devidas a complexidade na classificação das notícias e interesses mercadológicos que utilizam ferramentas de disseminação de conteúdo robotizados. Muito embora hajam técnicas avançadas de inteligência artificial capazes de reduzir, ainda não existem ferramentas totalmente funcionais e práticas no combate às fake news, sendo ainda a conscientização dos usuários a melhor forma de prevenção.
Análise de segurança e desempenho de redes blockchains privadas/consorciadas quanto aos ataques DoS internos
Authors: Battisti João Henrique Faes , Miers Charles Christian
Published: May 2021

Soluções que utilizam a tecnologia blockchain estão ganhando cada vez mais suporte dos desenvolvedores de sistemas. As instituições tem integrado redes blockchain em seus sistemas, e uma maneira usual de incluir nós de blockchain é através de máquinas virtuais (MVs). Este trabalho possui como objetivo de realizar uma análise de segurança e desempenho para verificar o comportamento das MVs perante à ataques Denial-of-Service (DoS), uma vez que o ﬂavor destas instâncias normalmente possui poucos recursos computacionais.
Rastreabilidade de alocação e desalocação de contêineres usando Docker Swarm com base em blockchain consorciado
Authors: Marques Marco Antonio , C. Miers Charles
Published: May 2021

Em um cenário de computação em nuvem, no qual serviços são desenvolvidos e oferecidos a clientes em uma plataforma terceirizada, o monitoramento é um aspecto essencial na otimização da escalabilidade, distribuição dos serviços, detecção e prevenção de falhas, cobrança pelos recursos utilizados, dentre outros aspectos. Neste cenário, cada ator envolvido pode implementar sua própria ferramenta de monitoramento. Esta característica pode levar a possíveis divergências quanto aos eventos coletados. Nestas situações, surge a dúvida sobre qual dos diferentes dados coletados está correto. Este trabalho apresenta uma proposta de solução que colete e promova a validação e o consenso entre os atores participantes quanto aos eventos de ciclo de vida de contêineres coletados, garantindo sua integridade, disponibilidade, irretratabilidade e auditoria.
Modelagem de Ameaças em Pipelines de Desenvolvimento
Authors: M. Reichert Beatriz , R. Obelheiro Rafael
Published: May 2021

Em anos recentes tem crescido a preocupação com a integridade de software, ou seja, a garantia de que o software não seja adulterado no caminho entre desenvolvedores e usuários. Esse caminho é representado por um pipeline de desenvolvimento de software. Este trabalho propõe desenvolver um modelo de ameaças para o pipeline de desenvolvimento e identificar mitigações para as ameaças encontradas. O artigo apresenta o pipeline e o modelo de ameaças para uma de suas etapas.
Orquestrando tráfego em redes OpenFlow com o Havox
Authors: Soares e Silva Rodrigo , De Lucena Sidney
Published: May 2021

As redes deﬁnidas por software já vêm conferindo maior poder de controle aos operadores de rede, mas gerar muitas regras OpenFlow simulInserido nesse escopo da geração taneamente ainda é um trabalho árduo. múltipla de regras, este trabalho apresenta o Havox, um serviço que auxilia a orquestração de tráfego através de uma linguagem de conﬁguração simples, de alto nível e baseada nos campos OpenFlow. Os experimentos mostraram uma considerável diminuição do esforço de programação da rede de forma escalável, reduzindo o número de parâmetros e de linhas de código para se deﬁnir o comportamento da rede.
SDN-IPS: Uma Ferramenta para Contenção Automatizada e Colaborativa de Ataques Cibernéticos Baseada em SDN
Authors: Brito Italo , Ribeiro Adriana , Sampaio Leobino
Published: May 2021

O crescimento e diversidade dos ataques cibernéticos impõem requisitos temporais estritos e necessidade de ﬂexibilidade na aplicação de controles de segurança. A automação e atuação colaborativa tornam-se, portanto, abordagens imprescindíveis nesse cenário. Este artigo apresenta o SDN-IPS, uma ferramenta que agrega a visibilidade dos Sistemas de Detecção de Intrusos com a programabilidade do paradigma SDN, criando uma solução para contenção de ataques através de estratégias de bloqueio, restrição de banda ou isolamento em quarentena. Com aplicabilidade técnica, tanto em redes de campus quanto em redes de backbone, e didática, para ensino de redes e segurança, o SDNIPS pode beneﬁciar operadores e pesquisadores na detecção e contenção de atividade maliciosa na rede. A ferramenta será demonstrada através do testbed FIBRE, integrada, como estudo de caso, a uma aplicação de enlaces metroethernet (e-Line) e roteamento inter-AS (BGP).
BB-Gen: A Packet Crafter for Data Plane Evaluation
Authors: Cesen Fabricio , Patra P. Gyanesh , Rothenberg Christian
Published: May 2021

With the advent of research on fast path packet processing, trafﬁc generator tools witnessed many entrants with features ranging from supporting list of protocols, analyzing network trafﬁc to measuring throughput and latency of packets. While approaching towards feature completeness, the tools are becoming more complex every time making it difﬁcult to port, manage, and use. BBGen with a sole focus on simplicity complements other trafﬁc generators instead of trying to replace them. BB-Gen is a simple CLI-based packet crafter to generate packet ﬂows formatted as PCAP ﬁles. The tool supports different standard protocols and creates the necessary traces for network function conﬁguration and testing. It allows creating PCAPs for worst and best case scenarios with all unique ﬂows or following ﬂow distributions published elsewhere. In this demo, we feature BB-Gen as used by the MACSAD development team to test P4-based software switch pipelines.
PDAC: Um Protocolo de Alocação Dinâmica de Canais para Ambientes Médicos
Authors: Cremonezi Bruno , Vieira Alex , Nogueira Michele
Published: May 2021

Redes corporais permitem o monitoramento contínuo de pacientes em ambientes médico-hospitalares. Porém, a alta densidade de redes nesses ambientes e a escassez de canais de comunicação provocam interferências e consequente baixo desempenho. A correta alocação de canais pode eliminar problemas deste tipo. Entretanto, as soluções existentes para este problema conﬁam em entidades centralizadoras e não conseguem prover um serviço que obedeça aos requisitos de aplicações médicas. Nesse sentido, apresentamos PDAC, um protocolo na camada de acesso ao meio de comunicação ciente dos requisitos das aplicações médicas. PDAC inspirado em uma solução gulosa do problema de coloração de grafos e promove uma alocação dinâmica de canais em cenários hospitalares através do trabalho colaborativo de múltiplas estações base. O protocolo teve suas propriedades veriﬁcadas formalmente e, os resultados de simulações de ambientes realistas mostram que ele aumenta a vazão média da rede em 30% e reduz a latência de transferência em 40%, se comparado com os protocolos de alocação de frequência presentes na literatura.
On the Cost-Benefit Tradeoffs of Cloud Storage Services for End Users and Service Providers
Authors: Gonçalves Glauber , Vieira Alex , Almeida Jussara
Published: May 2021

Cloud Storage is a very popular Internet service. It allows users to backup data to the cloud as well as to perform collaborative work while sharing content. Despite the increasing interest in cloud storage, a thorough investigation on the costs and beneﬁts of this service for providers and end users has not been conducted yet. This dissertation aims at investigating such cost-beneﬁt tradeoffs for both providers and end users jointly. Using data collected from a real service (Dropbox), we developed new models, methodologies and tools to support providers and users in improving jointly their beneﬁts in cloud storage.
DBR3S: Um Mecanismo de Controle de Qualidade Multimídia em Redes Móveis Definidas por Software
Authors: Dos Santos Charles , Silva Felipe , Venâncio Neto Augusto
Published: May 2021

Este trabalho propõe o Dynamic Bit Rate Streaming Service over SDMN (DBR3S), um framework baseado em Redes Móveis Deﬁnidas por Software (SDMN) que implementa um modelo de adaptação de qualidade multimídia por meio de um plano de controle SDMN otimizado. O objetivo principal do DBR3S é superar as principais diﬁculdades introduzidas pelos modelos adaptativos tradicionais, que se baseiam em implementações nos clientes. As avaliações demonstraram a viabilidade do DBR3S, otimizando substancialmente a QoE dos usuários móveis em relação a serviços de transmissão de vídeo tradicionais.
Protocolo de Roteamento de Veículos Fundamentado na Taxa de Ocupação da Via para Redes Veiculares
Authors: Gomides Thiago , Guidoni Daniel
Published: May 2021

O crescimento exponencial do número de veículos tem se tornado uma constante preocupação nas grandes cidades. Anualmente, um deﬁcit bilionário é observado devido à gastos com combustíveis e à manutenção de veículos. O impacto desse caos nas ruas vem sendo pauta constante de discussões entre governos, pesquisadores e ambientalistas. Com o propósito de diminuir congestionamentos, este trabalho propõe uma solução para a reorganização dos veículos com base na taxa de ocupação das vias. Durante o seu percurso, o veículo notiﬁca a sua posição para o serviço de congestionamento. Periodicamente, este serviço utiliza a taxa de ocupação das vias para encontrar rotas alternativas e com menor tempo de duração. Resultados de simulação indicam que a solução proposta é capaz de reduzir o tempo de viagem com um pequeno impacto na distância percorrida.
Transmissão de Vídeo em Tempo Real em Redes AD HOC
Authors: Andrei Anderson , Abrahão Patrick , Immich Roger , Goldman Alfredo
Published: May 2021

Nos próximos anos é esperado um grande crescimento da transmissão de vídeos em redes sem ﬁo, especialmente em dispositivos móveis. Baseandose nesta crescente demanda, o principal objetivo deste trabalho é o de realizar uma análise quantitativa e qualitativa sobre a transmissão de vídeo em tempo real entre dispositivos móveis. Com isto, é esperado obter-se um melhor entendimento de alguns aspectos ligados à transmissão de dados. Para tal, foram analisadas algumas formas de transmissão de pacotes na rede para vídeo ao vivo. Através de simulações foi possível realizar comparações entre as diversas formas aﬁm de classiﬁcá-las quanto sua qualidade e a escalabilidade na rede. As comparações foram feitas entre os protocolos TCP, UDP e a técnica de transmissão DASH através de simulações feitas no OMNeT++ e o INET Framework. Assim, ﬁzemos análises com as métricas de atraso na entrega dos pacotes, quantidade total de KiB recebidos pelo dispositivo destino e a taxa de pacote recebidos e requisitados.
Autenticação mútua de nós sensores com nós intermediários para IoT no contexto de Fog Computing
Authors: Grüdtner Lukas D. , Loffi Leandro , Westphall Carlos B. , Westphall Carla M.
Published: May 2021

Várias evoluções de paradigmas foram propostas nos últimos anos. Fog Computing é uma área da Ciência da Computação que está em construção e constante evolução, e em conjunto com a segurança da informação, o paradigma se torna mais conﬁável e seguro para as plataformas da borda do IoT. Os quesitos de segurança são de difícil alcance em ambientes com recursos limitados. Este trabalho teve como objetivo aprimorar um modelo de autenticação, levando em consideração dispositivos IoT no contexto de Fog Computing. Por ﬁm, a validação por meio da implementação de um sistema de autenticação mútua produziu o resultado de conﬁdencialidade, integridade e autenticidade, aliada com dispositivos embarcados utilizados no paradigma Fog Computing.
Balanceakte zwischen Theorie und Empirie. Kommentar zur Debatte von Nils Kumkar/Uwe Schimank und Andreas Reckwitz
Authors: Burzan Nicole
Published: May 2021

Im Kommentar zur Debatte zwischen Nils Kumkar/Uwe Schimank und Andreas Reckwitz werden vier Aspekte diskutiert: die Konstruktion sozialer Klassen bei Reckwitz, deren Dynamiken und Relationen, die These eines Bruchs in der gesellschaftlichen Entwicklung sowie die Reflexion der Forschendenrolle in diesem Kontext.
Konturen einer neuen Klassengesellschaft? Einige Anmerkungen zur Konzeption der Mittelklasse bei Andreas Reckwitz
Authors: Mau Steffen
Published: May 2021

In diesem Beitrag diskutiere ich die kulturalistische Klassenkonzeption, die Andreas Reckwitz in seinen Büchern Gesellschaft der Singularitäten und Ende der Illusionen entwickelt hat. Dabei steht die Frage im Zentrum, welche Grundannahmen für sein Klassenkonzept ausschlaggebend sind. Es werden die Verknüpfung zwischen Singularisierung und neuer Mittelklasse, die definitorische Bestimmung der neuen Mittelklasse und der Nexus zwischen Klassen und Konflikt thematisiert.
Klassen und Klassenkonflikte in der postindustriellen Gesellschaft. Soziale Spaltungen und soziokulturelle Polarisierung in den Mittelklassen
Authors: Sachweh Patrick
Published: May 2021

Der Beitrag kommentiert die Debatte zwischen Kumkar und Schimank und Reckwitz über die Rolle zweier Fraktionen der Mittelklasse - einer alten und einer neuen Mitte - für die Dynamik gegenwärtiger soziokultureller Polarisierungen und Konflikte. Dabei wird die Konzeptualisierung des Klassenbegriffs diskutiert, der Rekurs auf die SINUS-Milieus problematisiert und auf eine potenziell relevante, bislang aber wenig beachtete generationale Dimension gegenwärtiger Konfliktdynamiken verwiesen.
Intransparente Beliebigkeit oder produktive Vielfalt? Konturen einer Soziologie der Nachhaltigkeit. Kommentar zum Aufsatz von Karl-Werner Brand
Authors: Henkel Anna , Barth Thomas , Köhrsen Jens , Wendt Björn , Besio Cristina , Block Katharina , Böschen Stefan , Dickel Sascha , Görgen Benjamin , Groß Matthias , und Simone Rödder , Pfister Thomas
Published: May 2021

Wir sprechen uns in unserer Replik dafür aus, die Pluralität soziologischer Perspektiven auch und gerade für den Gegenstandsbereich Nachhaltigkeit als Vorteil zu sehen und den Diskurs entsprechend zu gestalten.
Southern Theories und die Öffnung des sozialwissenschaftlichen Kanons: Darcy Ribeiros (vergessener) Beitrag zur Gesellschaftstheorie
Authors: Ruvituso Clara
Published: May 2021

Der Brasilianer Darcy Ribeiro (1922-1997) ist trotz seines bahnbrechenden und pionierhaften Denkens außerhalb von Lateinamerika kaum als Klassiker anerkannt. In diesem Artikel werden Ribeiros zentrale Beiträge zur globalen Gesellschaftstheorie in zwei unterschiedlichen Kontexten analysiert. Zunächst wird auf seine differenzierte Position im Rahmen der Dependencia-Debatte der 1970er und 1980er Jahre und auf seine Übersetzungen durch Suhrkamp eingegangen. Zweitens werden Ribeiros kritische Beiträge zu Modernität, Zivilisation und dem Zusammenleben in Differenz im Dialog mit der aktuellen Rezeption der Postcolonial Studies in Deutschland erläutert. In der Schlussfolgerung wird auf die Frage nach der ungleichen Wissenszirkulation zwischen Zentren und Peripherien eingegangen und für die Anerkennung Ribeiros als sozialwissenschaftlicher „Klassiker“ argumentiert.
Strafrecht gegen Korruption im Sport?
Authors: Sigmund Julian
Published: May 2021

The thesis examines the legitimacy of the criminal offenses introduced in Sec. 265c, 265d of the German Criminal Code (StGB). First, the addressed bribery-related manipulations of sports competitions are systematized phenomenologically and described in terms of extent and causes. The standard of review derived from the doctrine of legal interests and the principle of proportionality then requires an intensive examination of the content of the integrity of sport, which the legislature has declared to be the object of protection, an analysis of the structures of offenses, and an evaluation of the effectiveness of non-criminal law, in particular internal sports prevention and protection measures. As a result it should be noted: Sec. 265c and 265d of the German Criminal Code (StGB) also show questionable features of the expansive criminal legislation that has characterized recent years.
B2B-Plattformen
Authors: Haucap Justus , Kehder Christiane , Loebert Ina
Published: May 2021

Vor dem Hintergrund der ungebremsten Dynamik, welche digitale Technologien und 46 darauf basierende Geschäftsmodelle der Plattformökonomie aufweisen, untersucht die vorliegende Studie die Potenziale und Hemmnisse für den Aufbau von Plattformen im B2B-Bereich am Beispiel von Nordrhein-Westfalen. Die Studie entwickelt zudem Optionen, wie Potenziale weiter gefördert sowie Hemmnisse abgebaut werden können. Zwei Standortvorteile stechen dabei für Nordrhein-Westfalen hervor: der starke industrielle Sektor (u.a. Maschinenbau, Chemische Industrie oder der Stahl- und Metallindustrie und -verarbeitung) sowie Nordrhein-Westfalen als Standort zahlreicher internationaler Messen.
Die ‚Corruption Defence‘ des Gaststaats in internationalen Investitionsschiedsverfahren
Authors: Bothe Alexander
Published: May 2021

The study examines the legal consequences in the context of international investment arbitration proceedings if it is proven that the investment at issue was procured by corruption. The study critically examines the prevailing zero tolerance strategy of arbitral tribunals, according to which claims in connection with corrupt investments will always be dismissed. The author argues for the admissibility of claims in corruption cases in order to enable arbitrators to render awards that not only take account of the supply side of corruption but also of the demand side on the part of government officials of the host state.
Die Höchstüberlassungsdauer nach der AÜG-Reform 2017
Authors: Kottlors Elisa
Published: May 2021

The maximum assignment period introduced by the recent reform of the Temporary Employment Act (AÜG), the possibility to deviate from it by collective bargaining agreements and the stipulated fiction of the employment relationship with the hirer in case of exceeding the maximum assignment period, provided that no declaration of adherence is submitted, raise several new questions of interpretation and application. This thesis critically examines the concept of the reform and primarily analyses the new regulations from a union, constitutional and collective bargaining law perspective. It also discusses several specific questions, such as the calculation of the maximum assignment period and the newly introduced declaration of adherence, and presents possible solutions for controversially discussed legal questions in the context of the new regulations.
Can’t Dissolve Me Now: A COVID-19 Provoked Venous Thromboembolism Breaks Through Apixaban: Case Report
Authors: Arena Alexander , Hussein Ahmad , Kurkowski Ellen , Kurkowski Ellen , Kulkarni Miriam
Published: May 2021

Introduction: Coronavirus disease 2019 (COVID-19) is a multisystem process with a growing evidence of its endotheliopathy effects, with subsequent hypercoagulability states.

Case Report: WWe present an emergency department case of a COVID-19-provoked deep venous thrombosis and pulmonary embolism without a history of venous thromboembolism (VTE), with extension of the VTE despite adherence to apixaban.

Conclusion: This case demonstrates the importance of further research and protocols for optimal dosage and treatment to prevent worsening VTE in COVID-19 patients.
An Unusual ECG Artifact Caused by Faulty Cardiac Monitor Leads
Authors: Imhoff Bryan , Casey Wesley
Published: May 2021

Case Presentation: We present the case of a 74-year-old female patient who presented to the emergency department with lower extremity weakness found to have a fixed frequency square wave artifact in all leads of her electrocardiogram (ECG). After troubleshooting, faulty external cardiac monitor leads were identified as the cause of this unique artifact.

Discussion: The ECG is an important diagnostic tool for medical providers. Electrocardiogram artifacts are extremely common, and knowledge of artifacts is necessary to prevent inappropriate interpretation, diagnostic error, and unnecessary workup. Medical providers should have a low threshold for suspicion when ECG findings do not correlate with the patient’s chief complaint or history of present illness. They must also be familiar with the most frequent ECG artifact variants and be prepared to follow a stepwise approach to troubleshoot less frequent variants.
A Rare Case of Cranial Nerve VII Neuropraxia Associated with Alveolar Nerve Blocks
Authors: Allegra Stephen , Church Richard , Sudireddy Veera
Published: May 2021

Case Presentation: A 26-year-old male presented to our emergency department for six days of right-sided facial myasthenia and parasthesias following a dental procedure using anesthetic nerve blocks.

Discussion: Iatrogenic cranial nerve VII neuropraxia, a peripheral nerve injury, is an uncommon complication of alveolar nerve blocks with few documented cases specifically due to dental anesthesia. Treatment usually involves use of oral corticosteroid and/or antiviral medications along with close follow-up in clinic with a neurologist and/or otolaryngologist.
Demonstração clínica no pré-natal para o manejo da prevenção do ingurgitamento mamário: estudo quase-experimental
Authors: Oliveira Flavia Silva , Vieira Flaviana Vely Mendonça , Silva Aline Gabriele Ribeiro da , Guimarães Janaína Valadares
Published: May 2021

RESUMO Objetivo: investigar a efetividade da educação em saúde sobre amamentação no pré-natal para a adoção de medidas de prevenção do ingurgitamento mamário decorrente do aleitamento materno. Método: trata-se de um estudo quase-experimental com 136 participantes. No grupo experimental (n=91) foi realizada intervenção educativa com demonstração clínica sobre amamentação durante a gestação e reforço das orientações por telefone; o grupo-controle (n=45) recebeu as orientações habituais da unidade de saúde sem interferência da equipe de pesquisa. Para a análise dos dados foi realizada estatística descritiva inferencial, e risco relativo para associação das variáveis de interesse. Resultado: a adoção de medidas de manejo do ingurgitamento mamário foi superior no grupo experimental (p=0,026). A técnica adequada de amamentação foi prevalente entre as mulheres que receberam a intervenção (p=0,030), em especial na posição (RR: 1,39; IC 95%: 1,002-1,94) e pega (RR:20,03; IC 95%: 5,2-77,8). Além disso, o grupo experimental realizou a interrupção da mamada de forma adequada (p
Understanding fractions in the fourth grade of elementary school
Authors: Veselinović Ivana
Published: May 2021

In the paper is considered about the different approaches of fractions that are the basic for conceptual understanding all meanings of the fractions: 1) the part-whole relationship; 2) a relationship of two sizes, of scale; 3) a fraction as an operation resulting from the combination of two multiplicative operations at an intuitive level; 4) a fraction as an amount (Lamon, 1999; Charalambos and Pitta-Pantazi, 2007). The aim of the research is to test knowledge of students that shows understanding of the above approaches. In the study was used a descriptive test method and techigue. The results of the research show that understanding the fractions is limited with understanding the part-whole starting approach. In solving problems, students don`t use e visualization and modeling to facilitate the process of solving problems and show a degree of understanding of the fractures. The student's achievements are viewed in the context of the needs and ways of introducing different approaches to fractions into the curriculum and teaching practice.
Analysis of math textbooks by SPUR approach
Authors: Gordić Snežana , Nikolić Milica , Orlić Sonja
Published: May 2021

A textbook set is basic didactic material in teaching mathematics and it is very important what kind of textbook teachers and pupils use in teaching mathematics. The aim of this paper is to analyze the tasks in textbook sets of mathematics for the 4th grade of primary school using the SPUR approach. SPUR is a multi-dimensional approach to learning mathematics that encourages development of pupils through four dimensions: skills, properties, uses and representations. The sample consists of math textbook sets for the 4th grade of primary school. The instrument is a checklist compiled for the purpose of this research. Analyzes show that textbook sets differ significantly in the number of tasks by SPUR. Textbook sets predominantly stimulate development of skills, and least frequently the ability to graphically represent procedures and solve tasks.
A review of the research on the effectiveness of the conceptual change models on heat and temperature concepts and the structure of matter
Authors: Balać Sanja
Published: May 2021

Temperature phenomena are teached in primary education, but until recently, at that level of education, clarification based on the particle structure of the substance was avoided, thus creating space for the formation of a large number of alternative student ideas. Terms that describe the structure of matter such as molecule, atom, atomic bonds, etc are introduced in the upper grades (secondary education). Also, teaching contents about termal phenomena and processes are realized through teaching physics and chemistry, where the focus of learning is on macroscopic thermal manifestations without insight into the connection between the structure of a substance and its thermal (physical or chemical) changes. This paper presents an overview of research on the possibilities of the conceptual change models of thermal phenomena based on understanding of the structure of matter. Most research has shown that students at all levels of education, from preschool to university level, have retained alternative ideas about the concept of heat, which is the reason for questioning the effectiveness of teaching models that overcome the perceived misconceptions.
The influence of music culture teaching on the social-emotional development of younger school-age children
Authors: Stipančević Nataša , Milošević Jovana
Published: May 2021

The social-emotional development of young school-age children is, in different theoretical studies, often linked with different influences of music in its cultural, entertaining, educational, and other contexts. In the context of formal education, music is included in the education and development of children mostly through the organization and realization of musical culture instruction. Considering the numerous influences of music and musical culture, both on the life of a man seen from a general perspective, and on a child, it is significant and interesting to study the topic of the influence of musical culture instruction on the different segments of young school-age children development, considering the numerous specificities that come with this age, where the beginning of formal education could be the most important one. The main focus of the research conducted for the needs of the paper was to examine the existence of differences in the opinions of the parents of young school-age children, towards the role of musical culture instruction content on the social-emotional development of their children. The key results of this research indicate that the respondents have a mostly positive opinion towards different segments of music culture teaching in the context of their children's social-emotional development. Parents whose children are involved in extracurricular music activities have a more positive opinion about the impact of the content of music culture classes on the social-emotional development of their children compared to parents whose children do not attend extracurricular activities.
Social evolution in times of COVID-19 between politics, economics, and health
Authors: Figus Alessandro
Published: May 2021

As well as highlighting difficulties in the health sector at local, national, and international levels, the COVID-19 pandemic has placed states in crisis by questioning the model of globalization, the political system, and the economic system. The article starts from a historical and philosophical analysis and tries to find solutions for getting out of the crisis. Science alone is not enough; it is necessary to redesign sustainable models in the economy and new political strategies.
Performance Prediction Hoftware for IACC Yachts
Authors: Schlageter Eric C. , Teeters James R.
Published: May 2021

The performance prediction software development effort undertaken by the Partnership for America's Cup Technology (PACT) is reviewed. First, PACT's origin, members, and mandate is covered, interspersed with a historical perspective of prediction software. Next, the new IACC rule with constraints is given. The hydrodynamic model format used in the software is described. Based on PACT tank test data, improved formulations for viscous drag, utilizing dynamic wetted area and length for canoe body drag and a 'stripping' method for appendage drag are presented. Corrections for Froude number and heel effects on induced drag are summarized. A new upwind sail model and added resistance model are discussed. The use of a race modeling program is illustrated with results from three separate design studies: a geosim family, a length scaling family, and an appendage study. Typical upright resistance, drag polar plots, lift plots, sea spectra, and added resistance data are presented. The final section describes current developments including speed enhancements, improved portability, and use of a multi-variable, non-linear optimization scheme to search the design space.
Modeling IACC Sail Forces by Combining Measurements with CFD
Authors: Milgram Jerome H. , Peters Donald B. , Eckhouse D. Noah
Published: May 2021

A sailing dynamometer with a 42% scale model of an International America's Cup Class rig is used to measure sail forces and moments in actual sailing conditions. The sailing dynamometer is a 35-foot boat containing an internal frame connected to the hull by six load cells configured to measure all the forces and moments between the frame and the hull. All sailing rig components are attached to the frame, so that the sail forces are measured. Sail shapes in use are determined by computer-interfaced video. Computational fluid dynamics performed on the measured shapes provides the induced drag. This allows the measured drag to be decomposed into induced and form-and-parasitic components, which is necessary for generating a mathematical sail force model for a velocity prediction program (VPP). It is shown that VPP results using these new sail force coefficients are in better agreement with actual performance than are VPP results based on traditional sail force coefficients.
Dynamic Performance of Sailing Cruiser by Full-Scale Sea Tests
Authors: Masuyama Yutaka , Nakamura lchiro , Tatano Hisayoshi , Takagi Ken
Published: May 2021

The sailing performance of a 10.6m-LOA cruiser was evaluated by sea test and the results were compared with calculated values and numerical simulations. The sea test was carried out to examine the steady sailing performance as well as the dynamic performance which includes the motion in waves and tacking maneuverability of the boat. The sailing state parameters at the steady condition were compared with the results of the velocity prediction program, and the results were in good agreement.

The motion of the boat in waves was assessed in conjunction with wave measurements using a throw-in type wave meter. These data were analyzed by means of spectral analysis. The results indicated the sail damping effect on the rolling motion quantitatively. The tacking motion of the boat was also investigated. The trajectory of the boat was measured using differential GPS receivers, and these results were compared with the numerical simulation. The simulation showed good agreement with the sea test data.