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    Wyświetlanie 1-7 z 7
    Tytuł:
    Zróżnicowanie efektów działalności gospodarczej w Polsce a wybrane cechy regionów
    Diversity in the Effects of Economic Activity in Poland in Relation to Selected Regional Characteristics
    Autorzy:
    Jankiewicz, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/500464.pdf
    Data publikacji:
    2013-02-01
    Wydawca:
    Szkoła Główna Handlowa w Warszawie
    Tematy:
    wzrost gospodarczy w regionach,
    otoczenie społeczno-gospodarcze
    regional growth,
    socio-economic environment
    Opis:
    Celem artykułu jest nakreślenie zróżnicowania regionalnego w Polsce wg wybranych cech i wskaźników statystycznych oraz próba wyjaśnienia przestrzennego zróżnicowania PKB per capita. Do opisu warunków gospodarowania w poszczególnych regionach wykorzystano m.in. dane o działalności inwestycyjnej i badawczo-rozwojowej oraz o kapitale społecznym. Opis zróżnicowania województw pod względem wybranych cech został uzupełniony grupowaniem jednostek terytorialnych metodą minimalnych wariancji Warda. Ostatecznie wyselekcjonowane zmienne wykorzystano do estymacji modelu regresji. Objaśnił on 98% zmienności produkcji łącznej per capita w województwach.
    The paper aims to discuss regional diversification in Poland on the basis of selected characteristics and statistical indicators and attempts to explain the diversity in GDP per capita between regions. In order to do this some data on investments and R & D activity and on social capital, among others, is analysed. The description of regional diversification is supplemented by grouping of territorial units with the Ward's minimum variance method. Ultimately selected variables were used to estimate a regression model. It explained 98% of the variation of the GDP per capita in the regions.
    Źródło:
    Prace i Materiały Instytutu Rozwoju Gospodarczego SGH; 2013, 91: Badania koniunktury - zwierciadło gospodarki. Część II; 13-26
    0866-9503
    Pojawia się w:
    Prace i Materiały Instytutu Rozwoju Gospodarczego SGH
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Neural Networks in Economic Forecasting
    Autorzy:
    Łuczyński, Wiesław
    Jankiewicz, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/500217.pdf
    Data publikacji:
    2004
    Wydawca:
    Szkoła Główna Handlowa w Warszawie
    Opis:
    The complexity of economic processes is reflected in the time series which register their state. Not all the aspects of the economic process can be registered. In order to obtain the useful information from statistical data, it is necessary to apply many labor-consuming and sophisticated procedures. Economic conditions are represented by objective processes, such as industrial production, product prices, export and import, employment and unemployment, job vacancies, etc. on the one hand, and behavioural modes of businessmen and consumers, their assessments and expectations as regards prices, sales, employment, and other economic indexes on the other hand. So we are dealing with objective facts (quantitative data) and subjective facts (qualitative data). Moreover, the analysed processes are all interdependent. Such a situation requires extreme methodological flexibility - a sort of methodological eclecticism. In view of the multidimensional object, the use of merely one method may yield a distorted image. That is why several different methods have been used in this study: the naive no-change method, simple linear regression, auto-regressive (integrated) moving-average model (ARMA and ARIMA), and artificial neuronal networks.
    Źródło:
    Prace i Materiały Instytutu Rozwoju Gospodarczego SGH; 2004, 74; 377-393
    0866-9503
    Pojawia się w:
    Prace i Materiały Instytutu Rozwoju Gospodarczego SGH
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Consumer Confidence Indexes in New EU Member States
    Autorzy:
    Kokocińska, Małgorzata
    Jankiewicz, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/500372.pdf
    Data publikacji:
    2011
    Wydawca:
    Szkoła Główna Handlowa w Warszawie
    Tematy:
    Consumer confidence indexes
    emerging economies.
    Opis:
    One of the most important economic indicators developed on the basis of agents’ opinions is consumer confidence index. Such a situation stems from the fact that consumption is usually the most important element of total demand. In well developed economies in which consumer confidence indexes have been used for many years a lot of attention is paid to analysis of their behavior. They are the element of composite leading indicators developed among others by the European Commission and the US Trade Department. In the emerging economies, in which analyses of consumer behavior were introduced relatively recently, qualitative data on consumer confidence is treated with less attention. This suggests conducting research in such a field for new EU member states. Countries which joined EU in 2004 r. are: the Czech Republic, Estonia, Cyprus, Latvia, Lithuania, Hungary, Malta, Poland, Slovenia, Slovakia. This group of countries was subject to analysis presented in the paper. The main aim of the research is to find and analyze relationships between consumer confidence indexes and chosen macroeconomic variables. Research questions refer to common direction in such an analysis conducted worldwide: to identify factors influencing consumers’ opinion and check whether changes of consumer confidence lead to changes of chosen economic variables. Consumption in the state of equilibrium depends on propensity to consumption (measured by confidence index) and on possibilities which are represented by disposable income. Quantitative monthly data used in the research refers to purchasing power of households and consumption expenditure. On the other hand the scope of the research was aimed at main economic time series which can influence agents expectations. Composite consumer confidence index cannot be commonly applied to describe volatility of various types of consumption, so in the research simple (component) indicators were used as well. The analysis of linear relationships is based on the cross correlations. In order to find lags and leads there were estimated Pearson correlation coefficients for shifts ±12 months. The analysis of linear relationships was extended by Granger’s causality test in order to verify whether quantitative variables influence consumer’s answers. Reverse relationships were also verified. In order to track nonlinear relationships neural networks module of Statistica was used. In the case algorithm of optimal data set for model time series was applied. Achieved results allow to identify relationships between analyzed economic time series, but also can be treated as first step for introducing consumer confidence indicators to economic forecasting in chosen developing EU economies..
    Źródło:
    Prace i Materiały Instytutu Rozwoju Gospodarczego SGH; 2011, 86:Business Surveys, Business Cycles. Polish Contribution to the 30th CIRET Conference; 161-183
    0866-9503
    Pojawia się w:
    Prace i Materiały Instytutu Rozwoju Gospodarczego SGH
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-technique characterisation of InAs-on-GaAs wafers with circular defect pattern
    Autorzy:
    Boguski, Jacek
    Wróbel, Jarosław
    Złotnik, Sebastian
    Budner, Bogusław
    Liszewska, Malwina
    Kubiszyn, Łukasz
    Michałowski, Paweł P.
    Ciura, Łukasz
    Moszczyński, Paweł
    Odrzywolski, Sebastian
    Jankiewicz, Bartłomiej
    Wróbel, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/2204219.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    wafer homogeneity
    wafer defect pattern
    surface roughness
    indium arsenide
    beryllium doping
    Opis:
    The article presents the results of diameter mapping for circular-symmetric disturbance of homogeneity of epitaxially grown InAs (100) layers on GaAs substrates. The set of acceptors (beryllium) doped InAs epilayers was studied in order to evaluate the impact of Be doping on the 2-inch InAs-on-GaAs wafers quality. During the initial identification of size and shape of the circular pattern, non-destructive optical techniques were used, showing a 100% difference in average roughness between the wafer centre and its outer part. On the other hand, no volumetric (bulk) differences are detectable using Raman spectroscopy and highresolution X-ray diffraction. The correlation between Be doping level and circular defect pattern surface area has been found.
    Źródło:
    Opto-Electronics Review; 2023, 31, Special Issue; art. no. e144564
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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