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    Wyświetlanie 1-3 z 3
    Tytuł:
    Parallel regional convergence in Poland before and after EU accession
    Autorzy:
    Wójcik, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/1069019.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
    Tematy:
    Regional convergence
    EU accession
    parallel convergence
    sigma
    Polska
    Opis:
    The purpose of the study is to analyze the dynamics of regional disparities on NUTS 2 level in Poland for the period 1990–2017 within the framework of sigma convergence. We focus in particular on comparing the patterns of regional convergence before and after EU accession, introducing the methodology of parallel sigma convergence. The results show that the Mazowieckie voivodeship grew much above the average in both the pre-and post-accession periods, while eastern regions lagged behind. EU accession did not have a significant impact on the pattern of internal sigma convergence in Poland. Disparities between regions were increasing at the same pace before and after 2004, despite significant resources having been allocated to cohesion-focused undertakings after EU accession, especially in lagging eastern regions.
    Źródło:
    Miscellanea Geographica. Regional Studies on Development; 2021, 25, 2; 83-92
    0867-6046
    2084-6118
    Pojawia się w:
    Miscellanea Geographica. Regional Studies on Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Was Poland the next Spain? Parallel analysis of regional convergence patterns after accession to the European Union
    Autorzy:
    Wójcik, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/22446631.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Badań Gospodarczych
    Tematy:
    Poland vs Spain
    parallel regional convergence
    convergence of clubs
    distribution dynamics
    spatial model
    Opis:
    Research background: Poland and Spain share many common features resulting both from similarities of historical experience, and also cultural, political, socio-demographic factors. Both countries have a similar area, population and GDP structure. They also share historical experience related to political and economic transformation after a long period of non-democratic, centralized governments. Therefore, the experience of Spanish membership in the EU is often considered as a model for Poland. Purpose of the article: The purpose of this research is to perform a comparative empirical analysis of income convergence processes in Poland and Spain on a regional level. We aim to verify if and how these processes are related to one another (show similar paths). Special attention is paid to the periods after accession of these countries to the EU. Convergence patterns in both countries are compared with several tools. Methods: Spatial econometric model for absolute beta convergence, sigma convergence indicators and the analysis of distribution dynamics — transition matrices and kernel density estimation. Findings & Value added: The impact on EU accession on income convergence in Spain was positive both at the national and regional level. Regional convergence processes sped-up and interregional disparities decreased. The poorest subregions had relatively high probability to increase their income and catch-up with initially more developed regions. In the first decade after accession to the EU Poland has also achieved a significant improvement of income indicators at the national level. However, empirical analyses of GDP per capita distribution and its dynamics at the regional level in Poland show that the above mentioned progress does not spread out proportionally on all regions. Neither beta nor sigma convergence is observed. Instead, relatively fastest growth of initially richest regions (mostly large cities) introduces convergence of clubs leading to polarization. EU accession has accelerated divergence processes in Poland.
    Źródło:
    Equilibrium. Quarterly Journal of Economics and Economic Policy; 2017, 12, 4; 593-611
    1689-765X
    2353-3293
    Pojawia się w:
    Equilibrium. Quarterly Journal of Economics and Economic Policy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Advances in parallel heterogeneous genetic algorithms for continuous optimization
    Autorzy:
    Alba, E.
    Luna, F.
    Nebro, A. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/907622.pdf
    Data publikacji:
    2004
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    algorytm genetyczny
    optymalizacja ciągła
    konwergencja przedwczesna
    parallel genetic algorithms
    continuous optimization
    premature convergence
    heterogeneity
    Opis:
    In this paper we address an extension of a very efficient genetic algorithm (GA) known as Hy3, a physical parallelization of the gradual distributed real-coded GA (GD-RCGA). This search model relies on a set of eight subpopulations residing in a cube topology having two faces for promoting exploration and exploitation. The resulting technique has been shown to yield very accurate results in continuous optimization by using crossover operators tuned to explore and exploit the solutions inside each subpopulation. We introduce here a further extension of Hy3, called Hy4, that uses 16 islands arranged in a hypercube of four dimensions. Thus, two new faces with different exploration/exploitation search capabilities are added to the search performed by Hy3. We analyze the importance of running a synchronous versus an asynchronous version of the models considered. The results indicate that the proposed Hy4 model overcomes the Hy3 performance because of its improved balance between exploration and exploitation that enhances the search. Finally, we also show that the async Hy4 model scales better than the sync one.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2004, 14, 3; 317-333
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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