Migration policies in dynamic island models

Dynamic island models are population-based algorithms for solving optimization problems, where the individuals of the population are distributed on islands. These subpopulations of individuals are processed by search algorithms on each island. In order to share information within this distributed search process, the individuals migrate from their initial island to another destination island at regular steps. In dynamic island models, the migration process evolves during the search according to the observed performance on the different islands. The purpose of this dynamic/adaptive management of the migrations is to send the individuals to the most promising islands, with regards to their current states. Therefore, our approach is related to the adaptive management of search operators in evolutionary algorithms. In this work, our main purpose is thus to precisely analyze dynamic migration policies. We propose a testing process that assigns gains to the algorithms applied on the islands in order to assess the adaptive ability of the migration policies, with regards to various scenarios. Instead of having one dynamic migration policy that is applied to the whole search process, as it has already been studied, we propose to associate a migration policy to each individual, which allows us to combine simultaneously different migration policies

Migrants Selection and Replacement in Distributed Evolutionary Algorithms for Dynamic Optimization

Many distributed systems (task scheduling, moving priorities, changing mobile environments, ...) can be linked as Dynamic Optimization Problems (DOPs), since they require to pursue an optimal value that changes over time. Consequently, we have focused on the utilization of Distributed Genetic Algorithms (dGAs), one of the domains still to be investigated for DOPs. A dGA essentially decentralizes the population in islands which cooperate through migrations of individuals. In this article, we analyze the effect of the migrants selection and replacement on the performance of the dGA for DOPs. Quality and distance based criteria are tested using a comprehensive set of benchmarks. Results show the benefits and drawbacks of each setting in dynamic optimization.Universidad de Málaga. Proyecto roadME (TIN2011-28194). Programa de movilidad de la AUIP

A Survey of Growth and Development Issues of the Pacific Islands

This paper is a survey of some key variables with an international dimension and implications for growth and development policies in selected Pacific island countries. Results from a simple growth accounting exercise show that factor accumulation is the most dominant growth factor and that the contribution of total factor productivity is negligible. Therefore, increasing the investment rate to improve growth rate is a pragmatic medium-term policy option. Further, econometric analysis shows that foreign aid has a negligible effect on output and growth in Fiji, Solomon Islands and Papua New Guinea.macroeconomic analyses, economic growth, development issues, Pacific islands

International trade negotiations and the trans-border movement of people: A review of the literature

We review the international and New Zealand literatures on the two-way interaction between international migration and agreements designed to enhance cross-border trade or investment. Benefits and costs of migration, to the extent that these may feature in trade and migration negotiations, are discussed. While trade and migration can be substitutes in some contexts, they will be complements in other contexts. Liberalisation of services and the movement of people are likely to offer much more significant gains than liberalisation of remaining barriers to goods trade. Significant scope for liberalisation under GATS mode 4 (the movement of natural persons) may remain. However, temporary migration is already promoted on a unilateral and bilateral basis within immigration policy frameworks that may provide greater flexibility than GATS mode 4. With respect to both trade and migration, the more diverse the exchanging countries are, the greater the economic benefits tend to be. However, greater diversity may also imply greater social costs. This paradox of diversity needs to be addressed through appropriate social policies accompanying enhanced temporary and permanent migration

European Regional Science: Between Economy of Culture and Economy of Catastrophes (Review of the ERSA 2005 Amsterdam Congress Reports)

ERSA Congress can be seen as laboratory of ideas with broad representation not only European, but also scientists from US, Japan, Korea, Brazil, African and Asian countries. With very high speed new thoughts and phenomena from the European regional scientific community appear on the stages of the ERSA annual Congresses. Three new features were characteristic for the 2005 ERSA Congress in comparison with the previous ones. First, special focus on the factors of density in the regional development. That was not surprising as the meeting was held in the city of Amsterdam with the highest density in Europe where land and space are scarce goods. Second, integrative tendencies in attempt to use natural factors to explain traditional phenomena of the regional science. Issues of land and water management coincide with economic growth and regional development in many reports. Third, for the first time theme of networks and network society was embedded in many sections of the Congress and in the very title of the Congress itself. All these aspects as participants demonstrated could be positive creative factors increasing cultural assets of the European regions, efficiency of the knowledge transfer, leisure activities; or negative as the source of disaster and risk for human beings. Density factors (lack of people or lack of space?) divide European regional science into two sciences – urban for the populated regions and regional for the territories scarcely populated with very different themes, methods and tools of research. Housing markets, urban sprawl and commuting patterns are popular topics in the first case; labour markets and human capital in the second case. New Economic Geography models work smoothly in the first regions but are inappropriate in the second. Competition is harder in the labour markets of the populated regions but is softer in the regions with scattered population where it is substituted by the forces of cooperation. Contemporary regional society can be sustainable only as network society. In the reports networks were examined on different levels: a) as transportation networks in the investment national or interregional projects; b) as policentricity urban structures replacing Cristaller’s hierarchy of central places; c) as public-public, public-private partnerships combining public and private stakeholders in the decision-making process. Transition of the European regions from the industrial to network/service has begun 25 years ago. Position of the concrete region on this route determines clearly the type and intensity of its problem and research agenda. The more advanced is the region or nation on this route the more often terms like “reinventâ€, “rethinkâ€, “revisited†are used in the scientific community. Rediscovery of the old concepts, definitions, essence (as Amsterdam Congress demonstrated) is very creative and challenging process of the post-industrial regional science.

Governing Migration: Immigrant Groups' Strategies in Three Italian Cities - Rome, Naples and Bari

Ethnic networks constitute an important component of immigrants’ integration in their host societies. This has been a particularly important strategy in Italy, where institutional assistance for immigrants is often paltry and problematic. This paper examines three ethnic communities in Italy that have been particularly successful in using their ethnic social capital for integrating into Italian society at the city level: the Mauritians in Bari, Filipinos in Rome and Chinese in Naples. Sending countries’ policies and programs, as well as the socio-historical context of ethnic relations within the countries has also influenced the patterns of these networks. The psychological or motivational element behind these groups’ migration project is also critical to their integration, and is often manifested on a group level. Keywords: Migration, Immigrant, Ethnic group