Towards the design of efficient nonbeacon-enabled ZigBee networks

This paper presents experimental results of the communication performance evaluation of a prototype ZigBee-based patient monitoring system commissioned in an in-patient floor of a Portuguese hospital (HPG – Hospital Privado de Guimar~aes). Besides, it revisits relevant problems that affect the performance of nonbeacon-enabled ZigBee networks. Initially, the presence of hidden-nodes and the impact of sensor node mobility are discussed. It was observed, for instance, that the message delivery ratio in a star network consisting of six wireless electrocardiogram sensor devices may decrease from 100% when no hidden-nodes are present to 83.96% when half of the sensor devices are unable to detect the transmissions made by the other half. An additional aspect which affects the communication reliability is a deadlock condition that can occur if routers are unable to process incoming packets during the backoff part of the CSMA-CA mechanism. A simple approach to increase the message delivery ratio in this case is proposed and its effectiveness is verified. The discussion and results presented in this paper aim to contribute to the design of efficient networks,and are valid to other scenarios and environments rather than hospitals.

The need for standardized tests to evaluate the reliability of data transport in wireless medical systems

Wireless medical systems are comprised of four stages, namely the medical device, the data transport, the data collection and the data evaluation stages. Whereas the performance of the first stage is highly regulated, the others are not. This paper concentrates on the data transport stage and argues that it is necessary to establish standardized tests to be used by medical device manufacturers to provide comparable results concerning the communication performance of the wireless networks used to transport medical data. Besides, it suggests test parameters and procedures to be used to produce comparable communication performance results.

Gender wage and productivity differentials in the Portuguese tourism industry

The objective of this paper is to provide empirical evidence on the determinants of gender wage inequality in the Portuguese tourism industry. Relying on firm level wage equations and production functions, gender wage and productivity differentials are estimated and then compared in order to infer whether observed gender disparities are justifiable on the grounds that women are relatively less productive than men, or instead disparities are due to gender wage discrimination. This approach is applied to tourism industry data gathered in the matched employer-employee data set Quadros de Pessoal (Employee Records). The main findings indicate that female employees in the tourism industry in Portugal are less productive than their male colleagues and that gender differences in wages are fully explained by gender differences in productivity.

Gender, wages, and productivity: an analysis of the tourism industry in northern Portugal

Tourism represents a major economic activity in Portugal, with an enormous wealth and employment growth potential. A significant proportion of jobs in the industry tourism are occupied by women, given that this industry is characterized by a relatively higher percentage of female employees. Despite the evidence of female progress with regard to their role in the Portuguese labor market, women continue to earn less than their male counterparts. This is clearly the case of the tourism industry, where statistics reveal a persistent gender wage gap. The objective of this paper is to provide empirical evidence on the determinants of gender wage inequality in the tourism industry in northern Portugal. Relying on firm-level wage equations and production functions, gender wage and productivity differentials are estimated and then compared. The comparison of these differentials allows inferring whether observed wage disparities are attributable to relatively lower female productivity, or instead disparities are due to gender wage discrimination. This approach is applied to tourism industry data gathered in the matched employer-employee data set Quadros de Pessoal (Employee Records). The main findings indicate that female employees in the tourism industry in northern Portugal are less productive than their male colleagues and that gender differences in wages are fully explained by gender differences in productivity.

WAML World Congress: Direito Médico Mundial em Portugal

Eis que existem boas notícias científicas em Portugal. O WAML World Congress é o maior e mais prestigiado congresso mundial de direito médico. E, desta vez, vai ter lugar em Portugal, mais em concreto na Cidade capital do Mondego, Coimbra, entre os próximos dias 2 e 7 de Agosto de 2015. O seu Presidente ou Chairman, será o especialista português em direito médico, professor da Faculdade de Direito da Universidade de Coimbra, Doutor André Gonçalo Dias Pereira. Especialista que já esteve a fazer um excelente Seminário em Barcelos, Escola Superior de Gestão do Instituto Politécnico do Cávado e do Ave, no dia 26 de Maio de 2014, com o título de “O Direito da Concorrência: análise de um caso real”. Tema que relacionou com a poderosa indústria farmacêutica, entre outros aspectos conexos. § Behold, there are good scientific news in Portugal. The WAML World Congress is the largest and most prestigious world congress of medical law. And this time, will take place in Portugal, more specifically in the Mondego capital city, Coimbra, between 2nd and August 7, 2015. The President or Chairman, will be the Portuguese expert in medical law professor Faculty of Law, University of Coimbra, Doctor André Gonçalo Dias Pereira. Specialist who has been doing an excellent Seminar in Barcelos, School of Management Cávado Polytechnic Institute and Ave, on May 26, 2014, with the title "The Competition Law: analysis of a real case." Theme related to the powerful pharmaceutical industry, and other related aspects.