Pareto efficient allocation of an in-motion wireless charging infrastructure for electric vehicles in a multipath network

Electric vehicles (EV) use an eco-friendly technology that limits the greenhouse gas emissions of the transport sector, but the limited battery capacity and the density of the battery are the major barriers to the widespread adoption of EV. To mitigate this, a good method seems to be the innovative wireless charging technology called ‘On-Line EV (OLEV)’, which is a contactless electric power transfer technology. This EV technology has the potential to charge the vehicle’s battery dynamically while the vehicle is in motion. This system helps to reduce not only the size of the battery but also its cost, and it also contributes to extending the driving range before the EV has to stop. The high cost of this technology requires an optimal location of the infrastructure along the route. For this reason, the objective of this paper is to study the problem of the location of the wireless charging infrastructure in a transport network composed of multiple routes between the origin and the destination. To find a strategic solution to this problem, we first and foremost propose a nonlinear integer programming solution to reach a compromise between the cost of the battery, which is related to its capacity, and the cost of installing the power transmitters, while maintaining the quality of the vehicle’s routing. Second, we adapt the multi-objective particle swarm optimization (MPSO) approach to our problem, as the particles were robust in solving nonlinear optimization problems. Since we have a multi-objective problem with two binary variables, we combine the binary and discrete versions of the particle swarm optimization approach with the multi-objective one. The port of Le Havre is presented as a case study to illustrate the proposed methodology. The results are analyzed and discussed in order to point out the efficiency of our resolution method.     

Global Financial Crisis: An African Perspective

This paper reviews the expanding financial turmoil that has been triggered by the Asian crisis. It examines the factors behind the crisis, its impact on African countries and the main lessons and policy implications for African countries. The onset of the Asian crisis seems to have taken everybody by surprise because the Asian countries that were hit by the crisis had been among the most successful in sustaining high rates of economic growth, keeping high saving and investment rates and improving the quality of life of their citizens. However, the emerging consensus is that the Asian crisis is a hybrid of structural and policy distortions (macro- and micro-economic) in the affected economies. The impact of the crisis on African countries was mainly transmitted through declines in export prices and volumes. The low demand for primary commodities induced by the crisis and the large depreciation of Asian currencies appear to have played major roles in depressing commodity prices. With only a few exceptions, the commodities that suffered large price declines are those for which Asia constitutes an important market (e.g. oil) and/or those mostly supplied by Asian countries (e.g. copper, timber and rubber). Africa’s oil-exporting countries, which experienced large deterioration in their terms of trade, were the most affected. For the continent as a whole, export proceeds declined by 9.5 per cent between 1997 and 1998. This was the product of a 7 per cent decline in export prices and a 2.5 per cent decline in the volume of exports. The paper estimates that the crisis has caused the growth rate in the region to slide down by 1.2 percentage points, which indicates a loss of US $6.2 billion using aggregate GDP for 1997 as the base. To put this in an order of magnitude, it is about US $2 billion higher than the annual average flow of FDI to the continent in recent years. For the majority of African countries where the inflow of private capital is small and where public debt is dominant, the traditional risk management policies, such as adopting realistic exchange rates and reducing government deficits and inflation rates, should continue to be major policy tools to prevent financial crisis. However, as the role of private capital increases the design of macroeconomic policies would need to heed the lessons emerging from Asia. One basic lesson is that careful sequencing of domestic and external liberalization is needed. In that, restrictions on the capital account, especially on the more volatile capital flows should be lifted only after the domestic financial sector has been strengthened with adequate regulatory and supervisory institutions. This is particularly true because the Asian crisis has shown that reserves, even at very high levels, can be quickly depleted given the scale and volatility of short-term capital flows. Le présent document analyse le développement de la tourmente financière déclenchée par la crise asiatique. Il examine les causes de cette crise, son impact sur les pays africains, les principaux enseignements à en tirer et ses incidences politiques pour l’Afrique. Le déclenchement de la crise asiatique semble avoir pris tout le monde de court. Les pays asiatiques touchés sont parmi ceux qui avaient enregistré des taux de croissance économique des plus élevés, maintenu des taux d’épargne et d’investissement des plus soutenus, et amélioré le plus la qualité de vie de leurs citoyens. Cependant, de l’avis général, la crise asiatique résulte de la conjonction de distorsions d’ordre structurels et politiques (macro et micro économiques) dans les pays touchés. Son impact sur les pays africains a été principalement ressenti é; travers la baisse des prix et du volume des exportations. Le fléchissement de la demande des produits de base et la forte dépréciation des monnaies asiatiques provoqués par la crise ont manifestement joué un rôle déterminant dans la chute des cours des produits de base. A quelques exceptions près, les produits dont les prix ont sensiblement baissé sont ceux pour lesquels l’Asie constitue un important marché (par exemple le pétrole) et/ ou ceux qui sont essentiellement fournis par les pays asiatiques (cuivre, bois, caoutchouc). Les pays africains exportateurs de pétrole, qui ont subi une détérioration marquée de leurs termes de l’échange, ont été les plus touchés. Pour l’ensemble du continent, les recettes d’exportation ont baissé de 9,5 pour cent entre 1997 et 1998. Cette situation résulte de la baisse de 7 pour cent des prix et de la contraction de 2,5 pour cent du volume des exportations. Ce document estime que la crise a entraîné un ralentissement de croissance de 1,2 point de pourcentage, soit une perte de 6,2 milliards de dollars EU, si l’on utilise comme base le PIB global de 1997. Traduit en ordre de grandeur, ce chiffre est d’environ 2 milliards de dollars supérieur au montant des flux moyens annuels d’IDE obtenus par le continent au cours de ces dernières années. Pour la majorité des Etats africains oú l’apport de capitaux privés est faible, et la dette publique écrasante, les politiques traditionnelles de gestion de risque, comme l’adoption de taux de change réalistes et la réduction des déficits publics et du taux d’inflation, doivent demeurer les principaux moyens d’action pour prévenir les crises financières. Cependant, à mesure qu’augmente le rôle des capitaux privés, la conception des politiques macroéconomiques devrait tenir compte des leçons qui se dégagent de l’expérience asiatique. La principale leçon est qu’il faut faire preuve de prudence dans la programmation de la libéralisation interne et externe. Dans cet esprit, la restriction des mouvements des capitaux, notamment ceux de capitaux les plus volatiles, ne doit être levée qu’après la consolidation du secteur financier au niveau interne avec le concours d’institutions compétentes de réglementation et de contrôle. Cette précaution est d’autant plus nécessaire que la crise asiatique a démontré que les réserves, même à des niveaux très élevés, peuvent s’épuiser rapidement du fait de l’ampleur et de la volatilité des flux des capitaux à court terme.     

A production/remanufacture model with returns’ subassemblies managed differently

This paper considers a production-remanufacturing inventory model for a single product, where constant demand is satisfied from the inventory of newly produced and remanufactured items. Although the available models in the literature imply that collected used units (or returns) are disassembled for recovery purposes, these models really do not treat them as such. Contrary, the returns are assumed to be recovered as whole units, perhaps, for simplicity. This assumption may not capture the benefits reaped from product recovery programs. This paper addresses this limitation in the literature and assumes that each unit of a used product is collected and disassembled into components, where these components are sorted into subassemblies, which are fed back into the production-remanufacturing process. The returned subassemblies are remanufactured and reassembled to represent a second source of as-good-as-new units of the end-product. For this multi-component inventory problem, the question that needs to be answered is whether, or not, extreme strategies of either pure remanufacturing or pure production are more economical than a mixed strategy (one that combines both strategies). A mathematical model is developed that accounts for the inventories of subassemblies. The results suggested that not accounting for the disassembled components of a product leads to inappropriate inventory decisions that are not environmentally sound.     

Alleviating rural poverty in sub-Saharan Africa

This analysis of rural poverty and hunger in Africa discusses the intertemporal and cross-sectional dimensions of poverty as an aid to policies and programs to alleviate hunger. Since nutritional adequacy of diets varies according to season, seasonality is an important cause of poverty especially in countries with 1 major harvest. In agricultural communities the wet season brings on food shortages and high prices, requiring assistance programs to concentrate on alleviating hunger at this time of year. Drought places a similar demand on resources. People may be poorer in 1 section of a country than another if they have no access to the existing power system, depriving them of services and assistance. There are forgotten regions of Africa where people are poor due to physical isolation, increasing the risk of drought and impeding emergency relief. Production in these areas may be low because there are no consumer goods to buy with surplus. It is important to identify target groups for financial assistance which will change with time and environmental conditions.     

The Effect of the Arab Spring on Preferences for Redistribution in Egypt

This paper investigates the effect of the revolution that occurred in January 2011 in Egypt on the demand for redistribution in that country, which has drastically increased since that period. This shock has been an important event, enhancing freedom and the political structure. In a first step, taking into account the main determinants of preferences for redistribution in the literature, our results differ, showing a positive impact of religion and a negative impact of altruistic attitudes. In a second step, we rely on a diff-in-diff approach to estimate the effect of the revolution, using three similar countries as a control group. We find that Egyptians became much more favorable to redistribution after the Arab Spring. Moreover, the revolution effect is stronger for the poorest people and those who are interested in politics.     

Organization Capital and the Cost of Equity Financing in Medium‐Sized Manufacturing Firms

We examine the effects of organization capital—evident in management quality practices—on firms’ implied cost of equity. We show that superior management practices decrease firms’ cost of equity capital. This novel finding, robust to a battery of sensitivity analyses and to endogeneity bias, highlights the importance of superior management practices in improving firms’ financing conditions. In sum, this study demonstrates that the quality of management practices maps onto firms’ financing conditions, stressing the value relevance of intangible assets.     

THE COST OF THE U.S. SUGAR PROGRAM REVISITED

The article analyzes the welfare cost of the U.S. sugar program using a multimarket model of U.S. sweetener markets. The latter includes raw crops, sugar extraction and refining, and sweetener users (food-processing industries and final consumers). The authors address the industrial organization of food industries using sweeteners and treat the United States as a large importer. With the removal of the program, this article estimates (all figures in 1999 dollars) that in 1998 cane growers, sugar beet growers, and processors would have lost $307, $650, and $89 million, respectively; sweetener users would have gained $1.9 billion. World prices would have increased by 13.2%. The deadweight loss of the program is estimated at $532 million.