bluuebunny/crossref_metadata_2025_split huggingface dataset:
Performance Analysis of SIC based hybrid precoding for multi-user case in 3D scenario
Authors: MYADAR Rajashekhar , m vanidevi 
Published: June 2022

Abstract
Massive MIMO (multiple input multiple output) systems are best suitable for mmWave communications improving throughput and spectral efficiency in 5G. Beamforming is a wireless technique adopted by massive MIMO and used in 4G & 5G to increase the directivity and energy efficiency by focusing the signal in specific direction supporting only single user transmission with one data stream. Precoding is a generalized form of beamforming to support multi-stream transmission in multi-antenna wireless communication, such that combination of analog and digital precoding forms the hybrid precoding which shows good performance with less complexity. Successive Interference Cancelation (SIC) is a technique in which optimization of different antenna arrays will be done one by one such that while optimizing the capacity of specific array contribution of earlier optimized array is removed from the total capacity and precoder of that specific optimizing array will be computed. In this paper we have designed the SIC based hybrid precoding using sub-connected and fully-connected structures for multi-user (MU) case and compared them with the optimal precoding for mmWave massive MIMO systems in a 3D scenario, where both azimuth and elevation angles are taken into account in the channel. The proposed algorithms are simulated in the MATLAB and compared their performance with different parameters and shown that SIC-based scheme is near-optimal for multi-user case.
Security Model and Algorithms in Federate learning under IoT Critical Infrastructure
Authors: JALALI NASIR AHMAD , Chen Hongsong 
Published: June 2022

Abstract
in today's digital world, IoT has a vital and very important role in offering and exchanging information services throughout the internet. it is new technologies and applications that have a deep effect on every domain of our daily life such as education, social, healthcare, and so on. IoT deals with many different sensing objects and machines that interact with each other to do their activities, IoT collects and exchanges data from all sensing objects and machines. Stores the collected data in structured or unstructured format managed through cloud platform services. Due to IoT have classical centralized learning algorithms, it affects directly by computational power and time, most importantly security and privacy issues respect with to user data. So for overcoming these challenges, federated learning is a favorable solution that enables on-object machine learning without migrating end-user private data to the central point (cloud), as well as Artificial Intelligent (AI) benefits to domains with sensitive data, only learning model update will be transferred between end-devices and the central server. By using the federated learning model the scope of the decentralized approach will be boost by having a huge number of clients for collaborating training, this FL makes vulnerable again various security threats and risks. In this paper, we analyze the overall vulnerabilities being exploited by malicious attackers which impact system security and privacy violation, common security threats and attacks in FL to distributed machine learning solutions and defensive techniques to enhance security/privacy vulnerabilities such as security models and algorithms to secure information in a decentralized system, network security as well as access control for availability, integrity, and confidentiality ( AIC), end device are required to protect and secured from unauthorized access.
O nível de caixa e a proteção aos acionistas minoritários podem afetar a deslistagem de empresas no Brasil?
Authors: Rodrigues Oliveira Juliana , Maciel Peixoto Fernanda , Olímpia Neves Mamede Maestri Cláudia 
Published: June 2022

RESUMO
O presente estudo teve por objetivo analisar os aspectos intrínsecos da deslistagem no Brasil, de forma a compreender os determinantes desse processo em momentos de crise e de estabilidade econômica. A amostra compreendeu todas as empresas listadas (com exceção das firmas pertencentes ao setor financeiro e de fundos) na BM&FBOVESPA no período de 2004 a 2015, o que representou 576 empresas, das quais 243 se deslistaram e destas, 112 foram voluntariamente. O modelo de regressão adotado foi o logit com dados em painel. A fundamentação teórica se baseou principalmente nos estudos de Pour e Lasfer (2013), Bortolon e Silva Júnior (2015), Saito e Padilha (2015) e Santos (2016). Os resultados evidenciaram relação positiva com a deslistagem voluntária para as variáveis caixa em momentos de crise, tamanho da empresa e oportunidades de crescimento, e, relação negativa com a deslistagem voluntária para as variáveis distribuição de dividendos em momentos de crise, emissão de ADR’s, nível de Governança Corporativa e alavancagem. A principal contribuição desta pesquisa foi evidenciar que em momentos de crise: uma maior disponibilidade de caixa aumenta a probabilidade de a empresa se deslistar da bolsa de valores e, uma maior proteção aos acionistas minoritários atenua a probabilidade de deslistagem das empresas.
Palavras-chave: Deslistagem Voluntária; Disponibilidade de Caixa; Governança Corporativa; Proteção aos Acionistas Minoritários.
Governança Corporativa em Cooperativas de Saúde: Um Estudo de Caso na Unimed Fortaleza
Authors: Wanderley Lima Soares Francisco , De Queiroz Machado Diego , Barboza Guimarães Daniel , Katielli Azevedo de Macedo Alana 
Published: June 2022

RESUMO
A adoção de práticas de governança corporativa já é obrigatória em empresas elencadas no mercado mobiliário, mas, em empresas classificadas como cooperativa no ramo de assistência médica, não. A Unimed Fortaleza, mesmo não possuindo uma exigência legal, adota as práticas de governança para atender as exigências dos stakeholders. Utilizou-se para coleta de informações os relatórios de gestão, estatuto social e código de conduta ética. O levantamento das informações foi realizado por meio dos relatórios de gestão e sustentabilidade concernentes aos períodos de 2007 e 2015, que compreendem dois momentos singulares na existência da empresa no que tange à composição gerencial e modelos de relatórios de gestão. Fez-se uma análise comparativa nestes dois períodos, no intuito de averiguar a existência de alguma diferença significativa no escopo gerencial, que pudesse ter sido marcante nestes dois momentos da empresa, observando os pilares da governança corporativa, quais sejam: propriedade, conselho de administração, gestão, órgãos de fiscalização e controle, e conduta e conflito de interesses. Concluiu-se, após análise, que a abordagem gerencial abordada no período de 2015 possuiu mais clareza, concisão, transparência e prestação de contas, comparando-se com o período de 2007.
Palavras-chave: Governança corporativa. Pilares da Governança. Cooperativa médica. Estudo de caso.
QUALIDADE DA INFORMAÇÃO CONTÁBIL E GOVERNANÇA CORPORATIVA: Uma análise da produção científica internacional
Authors: Renan Voltolini Gomes Adhmir , Strassburg Udo , Ribeiro de Mello Gilmar 
Published: June 2022

RESUMO
O presente estudo objetivou analisar o atual estágio da pesquisa referente a qualidade da informação contábil relacionada com governança corporativa no âmbito internacional. Para tal, foi realizada uma análise temporal de publicações e citações, referências mais citadas e sociométrica dos artigos mais citados e, além disso, foram abordadas as leis bibliométricas de Bradford, Lotka e Zipf. A base de periódicos selecionada foi a WEB OF SCIENCE, não foi realizado corte temporal, assim, o limite temporal é o estabelecido pela base. As palavras-chave pesquisadas foram “Quality of information” em qualquer parte do artigo, em seguida, foi filtrado nos resultados as que continham “Governance” em qualquer parte do artigo. Dentro desses parâmetros, foram encontrados 1.453 artigos sobre o tema, sem realizar exclusões. A análise foi elaborada com auxílio de planilhas eletrônicas e com os softwares bibliométricos VOSviewer e Ucinet 6. Nos resultados, ficou evidenciado que o tema atingiu mais de 100 artigos publicados por ano após 2010. Em 2015 e 2016 as publicações ultrapassaram a marca de 200 por ano e, até julho de 2017, totalizaram 98 publicações. Quanto à Lei de Bradford, os artigos foram classificados em cinco zonas. Sendo o núcleo composto por apenas 6 periódicos, mas com a produtividade de 290 artigos sobre o tema, corresponde a 19,96% do total de publicações. E quanto à Lei de Lotka, a proporção de autores que publicaram apenas uma obra é de 82,17% e, quando soma-se a quantidade de autores que publicaram apenas duas obras, o percentual alcança 94,49%. Quanto à Lei de Zipf, denota-se que Auditor é o termo mais recorrente, 199 vezes, e System com 164 ocorrências é o segundo. Em terceiro com 124 ocorrências, está o termo earnings management. A governança está relacionada a qualidade em outra densidade, porém detém proximidade com o termo Disclosure quality, Information asymmetry e ownership structure. Na abordagem sociométrica, o artigo que detém o maior nó refere-se aos autores Leuz, Nanda e Wysocki (2003) relacionado ao gerenciamento de resultados e proteção dos investidores. A contribuição deste estudo refere-se à descrição de um tema de pesquisa amplo, com o intuito de nortear futuras pesquisas voltadas ao tema.
Palavras-chave: Governança corporativa. Qualidade da Informação Contábil. Análise Bibliométrica.
INFLUÊNCIA DAS BOAS PRÁTICAS DE GOVERNANÇA CORPORATIVA NA CONTROLADORIA DAS EMPRESAS QUE ATUAM NO NOVO MERCADO DA BM&FBOVESPA
Authors: César Melo Ribeiro Henrique , Colares Oliveira Marcelle 
Published: June 2022

RESUMO
O presente estudo tem como objetivo maior levantar os impactos da adoção das boas práticas de Governança Corporativa sobre a área de Controladoria das empresas que atuam no Novo Mercado da BM&FBovespa (Bolsa de Valores de São Paulo). Em termos metodológicos, procedeu-se a uma pesquisa do tipo qualitativa, com três formas de investigação: bibliográfica, documental e questionário fechado. A análise dos dados realizou-se por meio de questionário fechado sendo ainda apoiada por ferramentas e procedimentos estatísticos e interpretativos. Os principais resultados foram: na estrutura de planejamento, isto reforça o poder que as boas práticas exercem na definição destas estruturas. Entretanto, a estrutura denominada contabilidade societária, sofreu maior influência, em decorrência da adoção das melhores práticas. A governança corporativa influenciou nos seguintes grupos de funções: contábil, gerencial estratégica, planejamento organizacional e gestora da informação, impactando na qualidade da informação contábil gerada pela área de controladoria, minimizando a assimetria da informação e os possíveis conflitos de agência. O presente estudo aponta e conclui que houve impactos da adoção das boas práticas de Governança Corporativa sobre a área de Controladoria nas empresas investigadas.
Palavras-chave: Governança corporativa; Controladoria; BM&FBovespa; Novo Mercado.
Corporate Governance and Performance in agricultural co-operatives in Brazil
Authors: Da Silva Américo Jean Carlos , Silvia Morales de queiroz Caleman  , Davi Rogério de Moura Costa  , Patrícia Campeão  
Published: June 2022

The aim of this study is to analyze the relationship between the adoption of corporate governance practices and the performance of agricultural co-operatives in Mato Grosso do Sul, Brazil. The document analysis was based on bylaws and meeting minutes from 2012 to 2014, from a sample of 21 co-operatives, totaling 84 documents. In order to assess the level of corporate governance we compared the co-operatives’ documents to the 40 recommendations proposed by the Brazilian Co-operatives Organization (OCB, 2016). These are distributed in 5 major areas: i) members and the general assembly; ii) management board; iii) supervisory board; iv) advisory bodies and audit; and v) ombudsman and co-operatives’ relationship with their members. The theoretical presupposition is that the adoption of corporate governance aligns the interests of the co-operatives and their members, which minimizes agency conflicts. To that end, we assumed the following theoretical precepts of the agency theory: i) monitoring, and ii) incentives. The results showed that the majority of governance practices recommended are related to the “management board” area, while those most adopted by the co-operatives are related to the dimension “members and general assembly”—which are strongly related to monitoring efforts. Considering the totality of recommendations proposed by OCB, only two have been 100% adopted by the co-operatives. The results show a low level of corporate governance in agriculture co-ops in Mato Grosso do Sul. We conclude that there is still a long way to go until governance practices become a mechanism to minimize agency conflicts.
Menstrual material maintenance, disposal, and laundering challenges among displaced girls and women in Northeast Nigeria
Authors: Schmitt Margaret L. , Gruer Caitlin , Clatworthy David , Kimonye Christopher , Peter Deborah E. , Sommer Marni 
Published: June 2022

Abstract
Displaced girls and women face a range of gendered challenges living in humanitarian contexts, including issues related to managing their menstruation safely, privately, and with dignity. Specific barriers identified across contexts include a lack of access to menstrual materials and supplies, safe and private toilets, and menstrual health information. Despite growing efforts by humanitarian organizations to address the menstruation-related needs of displaced populations, key aspects related to the maintenance of menstrual materials, including disposal and laundering, continue to be overlooked. This qualitative assessment was conducted in Northeast Nigeria with female Internally Displaced Persons aged 15–49 years (n = 70) and humanitarian response staff (n = 11). Findings indicate inconsistent access to menstrual materials and supplies, including items required for the routine cleaning of reusable menstrual materials. Additionally, many respondents highlighted insufficient access to menstruation-supportive toilets, including a lack of disposal options and poor lighting. Challenges with being able to discreetly launder reusable menstrual materials was problematic, leading some to adopt coping strategies such as constructing makeshift washrooms. Moving forward, more attention should be directed towards ensuring that the full spectrum of menstrual-related needs of girls and women are addressed, including improved water, sanitation and hygiene (WASH) facility design and programming that considers the practical implications of menstrual material maintenance.
Application of gated conduits for fertigation in irrigation systems
Authors: Aydin Alp Bugra , Tuna Muhammed Cihat , Baylar Ahmet 
Published: June 2022

Abstract
Fertigation involves dissolving fertilizer in irrigation water, and requires uniform water distribution and fertilization. A gated conduit can be used to inject liquid fertilizers or chemicals into a pressurized irrigation system. When the conduit gate is partially opened, a vacuum draws the fluid from the suction pipe into the conduit. An experimental study was conducted to investigate the fluid-injection ratio of gated conduits, which was shown to be high. The density and viscosity of the fluid were the most important parameters affecting the fluid-injection ratio. That ratio increased with increasing Froude number. It decreased as the gate opening proportion increased and with increasing conduit length. A design formula related to the Froude number, and the fluid's density and viscosity is presented to enable estimation of the fluid-injection ratio.
Water quality analysis using the CCME-WQI method with time series analysis in a water supply reservoir
Authors: Hu Lijiang , Chen Libin , Li Qing , Zou Kaipeng , Li Jinrui , Ye Hui 
Published: June 2022

Abstract
The quality of the drinking water source reservoirs has always been a research hotspot. However, few have studies focused on the water quality of reservoirs over a relatively long period with time series analysis. In this paper, based on water quality and hydrological data from 2010 to 2020, considering 8 water quality parameters, CCME-WQI with time series analysis was used to explore the interannual and seasonal changes in water quality in the Weishui Reservoir. Furthermore, the main factors affecting water quality were discussed through correlation analysis. The ARIMA model is used to predict water quality in the future. The results show that the water quality was seriously polluted from 2012 to 2013. After 2018, the water quality gradually improved and stabilized. In addition, the water quality is affected by inflow, showing the characteristics of poor water quality in summer and winter. The key parameters affecting water quality are TN and TP, which are almost 2 times higher than the grade II standard of water quality standard. Through the ARIMA model, it is predicted that CCME-WQI is maintained at 80.46 indicating that the water quality will be stable in the future.
Monitoring and forecasting cyanobacteria risk for a drinking water plant in Spain
Authors: Hurtado Isabel , Pouget Laurent , Fernández Sonia , Cascales Pablo 
Published: June 2022

Abstract
Cyanobacterial harmful algal blooms are a critical risk for public health since the release of cyanotoxins can reach hazardous levels in drinking water. In this study, a cost-effective monitoring programme has been developed and applied by a Spanish water operator to detect cyanobacteria presence in a drinking water plant reservoir; a total of 65 phytoplankton genera and seven cyanobacterial taxa were identified. Based on these monitoring data, different analysis techniques such as classification trees have been used to identify the potential situations of risk and to forecast cyanobacteria evolution in surface water. As a result, a new operational risk management plan has been developed and applied by the water operator since 2019. The main improvements concern the classification of the situations of risk in six groups (from low to very high, according to chlorophyl-a and cyanobacteria concentrations), the planning of the actions required under each situation (monitoring, management practice and treatment), and the use of the risk forecast to perform some of these actions from 2–3 days in advance. The methodology can be replicated to other case studies to facilitate the management of cyanobacteria risk and comply with the requirements of the revised European Drinking Water Directive adopted in 2020.
Conflito ambiental e turismo: o caso da comunidade do Oitero, Rio Tinto – PB
Authors: Cesar Pedro , Silva Sueny 
Published: June 2022

Na atualidade, observam-se diversos casos de conflitos ambientais resultado da atividade turística, tais fatos se dão pela falta de planejamento da atividade que resulta em especulação imobiliária e, consequentemente, conflitos. Quando diferentes pessoas percebem a natureza de forma antagônica e buscam utilizá-las de modo para benefício próprio há um conflito ambiental. A pesquisa apresentada, teve como objetivo mostrar o conflito ambiental que acontece na praia de Oiteiro, em Rio Tinto – PB. Onde a Companhia de Tecido Rio Tinto pede a reintegração de posse às famílias que vivem há mais de 150 anos na praia, em que formam a Comunidade do Oiteiro. De acordo com os entrevistados, tal fato existe pela vontade de instalação de um meio de hospedagem de grande porte. Para a pesquisa foi utilizado o método da observação participante, que aconteceu entre os meses de junho de 2017 e março de 2018, e teve como ferramenta de coleta de dados a entrevista não-estruturada e documental. Percebeu-se que as pessoas que moram na região mantêm a cultura da subsistência e serão muito impactadas por uma possível reintegração de posse. Além disso, foi verificado que a possível instalação do empreendimento também resultará em problemas para a biodiversidade e ecossistema da região. Há um forte movimento por parte dos moradores, movimentos sociais do Estado, políticos e Universidade na defesa da área, como forma de fazer valer o direito de um povo.
Palavras-chave: Conflito Ambiental. Turismo. Impacto Socioambiental. APA do Rio Mamanguape.
Review on In Silico Methods, High-throughput Screening Techniques,
and Cell Culture Based In Vitro Assays for SARS-CoV-2
Authors: Cetin Yuksel , Aydinlik Seyma , Gungor Aysen , Kan Tugce , Avsar Timucin , Durdagi Serdar 
Published: June 2022

Abstract:
The COVID-19 outbreak caused by the Severe Acute Respiratory Syndrome
Coronavirus 2 (SARS-CoV-2) continues to have high incidence and mortality rate globally.
To meet the increasingly growing demand for new therapeutic drugs and vaccines, researchers
are developing different diagnostic techniques focused on screening new drugs
in clinical use, developing an antibody targeting a SARS-CoV-2 receptor, or interrupting
infection/replication mechanisms of SARS-CoV-2. Although many prestigious research
publications are addressing this subject, there is no open access platform where all experimental
techniques for COVID-19 research can be seen as a whole. Many researchers
have accelerated the development of in silico methods, high-throughput screening techniques,
and in vitro assays. This development has played an important role in the emergence
of improved, innovative strategies, including different antiviral drug development,
new drug discovery protocols, combinations of approved drugs, and setting up new drug
classes during the COVID-19 outbreak. Hence, the present review discusses the current
literature on these modalities, including virtual in silico methods for instant ligand- and
target-driven based techniques, nucleic acid amplification tests, and in vitro models
based on sensitive cell cultures, tissue equivalents, organoids, and SARS-CoV-2 neutralization
systems (lentiviral pseudotype, viral isolates, etc.). This pack of complementary
tests informs researchers about the accurate, most relevant emerging techniques available
and in vitro assays allow them to understand their strengths and limitations. This review
could be a pioneer reference guide for the development of logical algorithmic approaches
for new drugs and vaccine strategies against COVID-19.
FGF23 Actions in CKD-MBD and other Organs During CKD
Authors: Sun Ting , Yu Xijie 
Published: June 2022

Abstract:
Fibroblast growth factor 23 (FGF23) is a new endocrine product discovered in
the past decade. In addition to being related to bone diseases, it has also been found to be
related to kidney metabolism and parathyroid metabolism, especially as a biomarker and
a key factor to be used in kidney diseases. FGF23 is upregulated as early as the second
and third stages of chronic kidney disease (CKD) in response to relative phosphorus overload.
The early rise of FGF23 has a protective effect on the body and is essential for
maintaining phosphate balance. However, with the decline in renal function, eGFR (estimated
glomerular filtration rate) declines, and the phosphorus excretion effect caused by
FGF23 is weakened. It eventually leads to a variety of complications, such as bone disease
(Chronic Kidney Disease-Mineral and Bone Metabolism Disorder), vascular calcification
(VC), and more. Monoclonal antibodies against FGF23 are currently used to treat
genetic diseases with increased FGF23. CKD is also a state of increased FGF23. This article
reviews the current role of FGF23 in CKD and discusses the crosstalk between various
organs under CKD conditions and FGF23. Studying the effect of hyperphosphatemia
on different organs of CKD is important. The prospect of FGF23 for therapy is also discussed.