The research accomplished in this dissertation is focused on the design of effective solutions to the problem that error codes occur in the ZigBee-based meeting attendance registration system. In this work, several different check algorithms are compared, and the powerful error-detecting Cyclic Redundancy Check (CRC) algorithm is studied. In view of the features of the meeting attendance registration system, we implement the check module of CRC-8. This work also considers the data reliability. We assume use retransmission mechanism to ensure the validity and completeness of transmission data. Finally, the potential technical improvement and future work are presented.

Submitted by JOSIANE SANTOS DE OLIVEIRA (josianeso) on 2018-11-12T15:20:51Z No. of bitstreams: 1 Jane Marusa Nunes Luiz_.pdf: 565579 bytes, checksum: 13fdbf6433de47f1951a5c703acbbd78 (MD5) / Made available in DSpace on 2018-11-12T15:20:51Z (GMT). No. of bitstreams: 1 Jane Marusa Nunes Luiz_.pdf: 565579 bytes, checksum: 13fdbf6433de47f1951a5c703acbbd78 (MD5) Previous issue date: 2018-07-05 / Nenhuma / O objetivo deste estudo é investigar empiricamente o comparecimento dos membros do conselho às reuniões e seus efeitos na remuneração do conselho de administração das empresas brasileiras de capital aberto listadas na BM&FBOVESPA, no período de 2015 a 2016. Para a consecução desta pesquisa, testou-se um grupo abrangente de variáveis considerando os argumentos da teoria de agência e a literatura anterior, mediante a utilização de regressão linear múltipla. Os resultados indicam que o tamanho do conselho e o número de conselheiros ocupados afetam negativamente a remuneração, enquanto que a independência do conselho, a participação em comitês, a idade e a área de formação são positivamente associadas com a remuneração do conselho de administração. Também se verificou que há relação entre o tamanho, a rentabilidade e o controle acionário da empresa com a remuneração do conselho. Identificou-se ainda que o percentual de frequência dos membros do conselho é de aproximadamente 93%, e que são realizadas em torno de 12 reuniões anuais, todavia o esforço do conselho de administração, medido pela frequência e o número de reuniões, não demonstrou significância estatística para explicar a remuneração. Essas descobertas fornecem implicações para futuras pesquisas a respeito do desempenho dos conselheiros no monitoramento da gestão e a remuneração do conselho de administração e dos executivos. / The purpose of this study is to empirically investigate the attendance of direcors at meetings and their effects on board compensation of Brazilian companies listed on BM&FBOVESPA, from 2015 to 2016. To achieve this research, a comprehensive set of variables was tested considering the arguments of agency theory and previous literature, using multiple linear regression. The results indicate that the size of the board and the number of busy direct affect negatively the compensation, while board independence, participation in committees, age and graduation are positively associated with compensation of the board of directors. It has also been found that there is a relationship between size, profitability and the shareholding control of the company with the board compensation. It was also identified that the percentage of board members' attendance is approximately 93%, and which are held around 12 annual meetings, however, the effort of the board of directors, as measured by the frequency and number of meetings, showed no significance statistical analysis to explain the compensation. These findings provide implications for future researches into the performance of directors in monitoring the management and compensation of the board of directors and executives.