In this study, we propose a new model for the automatic choice of the welding process based on the use of the multi-layers artificial neural networks (MLANN). The automatic choice of welding process is done in three steps; firstly, we started with the formulation of a training base which represents the experiments of the experts of the field as well as the necessary knowledge of know-how, and w...

the assessment of de-desertification alternatives can be effective in controlling the reclamation of disturbed landand avoiding destruction of areas at risk. until now, there has been no method to consider different criteria andalternatives, or to present the optimum alternatives based on systematic structures and experts’ perspectives.desertification is a complex process resulting from various...

We examine a local public goods economy with differentiated crowding. The main innovation is that we assume that the crowding effects of agents are a result of choices that agents make. For example, agents may be crowded (positively or negatively) by the skills that other members of their jurisdiction possess and these skills may be acquired through utility maximizing educational investment cho...

This paper uses household surveys from 13 developing countries to describe consumption choices, health and education investments, employment patterns and other features of the of the economic lives of the “middle classes” defined as those whose daily consumption per capita is between $2 and $4 or between $6 and $10. The data shed lights on differences and similarities between the middle classes...

This paper studies the determinants of parental choices of school attributes in Pakistan, a country where a long fraction of schools are private. We estimate a standard model of demand for differentiated products using a rich dataset with school attributes, household and child characteristics, and school choices. We find that a one-standard deviation increase in the quality of basic facilities ...

In this paper we are concerned with the simulation of stationary dynamic economies that go beyond the convex representative agent framework. We allow for noncontinuous Markovian laws of motion that may occur in models with discrete choices, multiple equilibria, bargaining power, optimal monetary and fiscal policies, heterogeneous agents, and market distortions. We prove the existence of an inva...