Wage Inequality by Education and Gender in MENA: Contrasting the Egyptian and Moroccan Experiences in the 1990s

The 1990s has been a decade of considerable socioeconomic change in the MENA region characterized by adoption of economic liberalization policies and a declining role of the state as an employer in the labor market. This paper explores some of the equity implications of this transition by examining changes in the distribution of returns to education and gender wage premia in the Egypt and Morocco market using joint models of educational choice and wage determination. Selectivity corrected returns to different levels of education indicate that a reduction in the role of the public sector lead to lower returns in the private sector and falling returns over time. Only at the university level, are returns higher in the private sector in Egypt indicating that employers place relatively little value on basic and secondary education. In Morocco there is some evidence of higher returns in the private sector by the end of the 1990, which might be indicative of better matching of educational credentials and productivity differences. Oaxaca-Blinder wages-differentials decompositions of sector and gender wage gap for Egypt and Morocco indicate that the unexplained component in public wage premia and gender gaps have declined in Egypt, but substantially increased in Morocco over the 1990s. Overall, economic liberalization and public sector retrenchment which were much more comprehensive in Morocco appear to have had a more dislocating effect also on labor market wage outcomes. The paper ends with some policy implications and suggests future directions of research in the areas of educational and public sector reform and policies to improve access of women to the private sectors in MENA

Learned Cardinalities: Estimating Correlated Joins with Deep Learning

We describe a new deep learning approach to cardinality estimation. MSCN is a multi-set convolutional network, tailored to representing relational query plans, that employs set semantics to capture query features and true cardinalities. MSCN builds on sampling-based estimation, addressing its weaknesses when no sampled tuples qualify a predicate, and in capturing join-crossing correlations. Our evaluation of MSCN using a real-world dataset shows that deep learning significantly enhances the quality of cardinality estimation, which is the core problem in query optimization.Comment: CIDR 2019. https://github.com/andreaskipf/learnedcardinalitie

Diversity gain for DVB-H by using transmitter/receiver cyclic delay diversity

The objective of this paper is to investigate different diversity techniques for broadcast networks that will minimize the complexity and improve received SNR of broadcast systems. Resultant digital broadcast networks would require fewer transmitter sites and thus be more cost-effective and have less environmental impact. The techniques can be applied to DVB-T, DVB-H and DAB systems that use Orthogonal Frequency Division Multplexing (OFDM). These are key radio broadcast network technologies, which are expected to complement emerging technologies such as WiMAX and future 4G networks for delivery of broadband content. Transmitter and receiver diversity technologies can increase the frequency and time selectivity of the resulting channel transfer function at the receiver. Diversity exploits the statistical nature of fading due to multipath and reduces the likelihood of deep fading by providing a diversity of transmission signals. Multiple signals are transmitted in such a way as to ensure that several signals reach the receiver each with uncorrelated fading. Transmit diversity is more practical than receive diversity due to the difficulty of locating two receive antennas far enough apart in a small mobile device. The schemes examined here comply with existing DVB standards and can be incorporated into existing systems without change. The diversity techniques introduced in this paper are applied to the DVB-H system. Bit error performance investigations were conducted by simulation for different DVB-H and diversity parameters