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Wyświetlanie 1-10 z 15
Tytuł:
Spag: a new measure of spatial agglomeration. Theoretical background and empirical examples
Autorzy:
Kossowski, Tomasz
Hauke, Jan
Powiązania:
https://bibliotekanauki.pl/articles/1051401.pdf
Data publikacji:
2018-12-30
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
agglomeration
concentration
specialisation
SPAG
clustering
distribution
geometric probability
distance distribution
regular region
economic activity
Opis:
Kopczewska (2017) proposed a new empirical measure of spatial agglomeration (SPAG) of economic activity based on geolocations of firms. The aim of the paper is to introduce theoretical backgrounds of SPAG. The measure is a product of two random variables with beta and gamma distributions. The moments of the product are described and estimated for Poland with spatial centroids of LAU2 treated as geolocations of firms for empirical distribution as well as for the set of firms located in a regular region. Another approach to SPAG properties has its origin in a geometric probability concept. We present the research results on geometric probability, applied to SPAG, as distance probability distributions for a regular region.
Źródło:
Quaestiones Geographicae; 2018, 37, 4; 33-42
0137-477X
2081-6383
Pojawia się w:
Quaestiones Geographicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of critical percolation clusters of mixtures of conducting and dielectric polymers
Autorzy:
Katunin, A.
Powiązania:
https://bibliotekanauki.pl/articles/122371.pdf
Data publikacji:
2016
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
electrical percolation
critical percolation cluster
chemical distance distribution
Minkowski-Bouligand dimension
conducting polymers
przesączania elektryczne
krytyczne przesączenia klastra
chemiczna dystrybucja odległości
wymiar Minkowskiego-Bouliganda
polimery przewodzące
Opis:
The paper deals with the analysis of critical percolation clusters that have resulted from the numerical simulation of mixtures of various conducting polymers in a dielectric medium. The conducting particles in the electrical percolation problem are modelled following the hard-core/double soft-shell model which considered realistic values of particles dimensions, electrical conductivity and hopping distances. The new formulation of the chemical distance distribution in the percolation clusters is developed and several representative examples using this formulation are presented. In order to verify the fractal nature of the obtained critical percolation clusters the Minkowski-Bouligand dimension formulation was applied. Approximation of obtained results confirms the fractal nature of analysed clusters.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2016, 15, 1; 59-69
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparing Income Distributions - Methods and their Application to Wage Distributions in Poland
Porównywanie rozkładów dochodów - metody i ich wykorzystywanie do analizy rozkładów płac w Polsce
Autorzy:
Jędrzejczak, Alina
Powiązania:
https://bibliotekanauki.pl/articles/905029.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
income distribution
economic distance
social welfare
inequality
Opis:
Rankings of income distributions are usually based on comparisons of social welfare. Assuming more or less general form of a social welfare function we can compare income distributions in time and in space. Income inequality can be compared by means of the well known Lorenz curve but the results will be ambiguous when the Lorenz functions of the considered populations intersect. Generalized Lorenz curves and quantile functions are more useful tools for ranking income distributions but in many situations it is necessary to make additional assumptions concerning social preferences reflected in a social welfare function. In the paper we present the methods useful for ranking income distributions and their application to the analysis of wage distributions in Poland. As a theoretical distribution the Dagum type-I model has been used.
Porównywanie rozkładów dochodów może być przeprowadzane na podstawie różnych kryteriów. Jedną z metod jest zastosowanie współczynników dystansu ekonomicznego Porównując rozkłady dochodów z punktu widzenia zamożności rozważanych populacji, bierzemy pod uwagę dwa aspekty tego zagadnienia - różnice w średnich poziomach dochodów oraz różnice w ich nierównomierności. Porównywanie nierównomierności może się odbywać za pomocą krzywych Lorenza - wyniki będą jednak niejednoznaczne, np. gdy funkcje Lorenza przecinają się Bardziej uniwersalnym narzędziem do rangowania rozkładów dochodów są uogólnione funkcji Lorenza oraz funkcje kwantylowe. Wymagają one jednak przyjęcia pewnych dodatkowych założeń dotyczących funkcji dobrobytu, która jest wyrazem preferencji społecznych. W artykule przedstawiono wyniki zastosowania powyższych metod dla rozkładów płac w Polsce. Jako rozkład teoretyczny wykorzystany został rozkład Daguma pierwszego typu.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2009, 225
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Power generalization of Chebyshev’s inequality – multivariate case
Autorzy:
Budny, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/1193069.pdf
Data publikacji:
2019-08-30
Wydawca:
Główny Urząd Statystyczny
Tematy:
multivariate Chebyshev’s inequality
Mahalanobis distance
multivariate normal distribution
multivariate t distribution
Opis:
In the paper some multivariate power generalizations of Chebyshev’s inequality and their improvements will be presented with extension to a random vector with singular covariance matrix. Moreover, for these generalizations, the cases of the multivariate normal and the multivariate t distributions will be considered. Additionally, some financial application will be presented.
Źródło:
Statistics in Transition new series; 2019, 20, 3; 155-170
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
How did Bythinella reach its present distribution in Central Europe?
Autorzy:
Mazan, K.
Powiązania:
https://bibliotekanauki.pl/articles/83423.pdf
Data publikacji:
1999
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Tematy:
Bythinella
distribution
Central Europe
intrapopulation variation
geographic distance
polymorphism
snail
Źródło:
Folia Malacologica; 1999, 07, 4
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution Patterns of Ambient Air Quality Pre- and During Pandemic in the Urban Area of Yogyakarta, Indonesia
Autorzy:
Brontowiyono, Widodo
Sihayuardhi, Ergiansyah Reezqiana
Maziya, Fina Binazir
Hakim, Luqman
Powiązania:
https://bibliotekanauki.pl/articles/2202179.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
ambient air quality
spatio-temporal distribution
inverse distance weight
urban
Opis:
This study identified the spatial distribution pattern of the ambient air quality in the Yogyakarta Urban Area. It was performed to determine the distribution pattern of SO2, CO, and NO2 concentrations for 2016–2019 (pre-pandemic) and 2020 (during pandemic). Furthermore, the spatial analysis was performed using the Inverse Distance Weighting interpolation method. This study proved that spatial modeling using this method has good accuracy, and it is easier to map the distribution pattern of ambient air quality. In 2020, most of the locations met the quality standard (62.64%). As a result, the SO2 and CO parameters immediately showed that most conditions are satisfactory. In 2016, the SO2 parameters met the quality standards at 74.24% of locations. In 2020, the number increased to 85.71%. In addition, the CO parameter reached the quality standard at 81.82% of locations in 2016 and a perfect level of 100% in 2020. This occurred due to the effects of the COVID-19 pandemic because most human and business activities decreased drastically. Therefore, all studies can be used as the basis for air quality modeling and post-COVID-19 predictions. This study is also important as a policy material in the monitoring and management system of ambient air quality in urban areas.
Źródło:
Journal of Ecological Engineering; 2022, 23, 10; 116--128
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Binary Classification of Heart Failures Using k-NN with Various Distance Metrics
Autorzy:
Udovychenko, Y.
Popov, A.
Chaikovsky, I.
Powiązania:
https://bibliotekanauki.pl/articles/226330.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
magnetocardiography
current density imaging
current density distribution map
k-NN classification
negative Tpeak
heart failure diagnostics
Mahalanobis distance
Cityblock distance
Eucleadian distance
Chebyshev distance
Opis:
Magnetocardiography is a sensitive technique of measuring low magnetic fields generated by heart functioning, which is used for diagnostics of large number of cardiovascular diseases. In this paper, k-nearest neighbor (k-NN) technique is used for binary classification of myocardium current density distribution maps (CDDM) from patients with negative T-peak, male and female patients with microvessels (diffuse) abnormalities and sportsmen, which are compared with normal control subjects. Number of neighbors for k-NN classifier was selected to obtain highest classification characteristics. Specificity, accuracy, precision and sensitivity of classification as functions of number of neighbors in k-NN are obtained for classification with several distance measures: Mahalanobis, Cityblock, Eucleadian and Chebyshev. Increase of the accuracy of classification for all groups up to 10% was obtained using Cityblock distance metric in binary k-NN classifier with 19 - 27 neighbors, comparing to other metrics. Obtained results are acceptable for further patient’s state evaluation.
Źródło:
International Journal of Electronics and Telecommunications; 2015, 61, 4; 339-344
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Sound Field Distribution in Architecturally Diverse Temples
Autorzy:
Błaszczak, Paweł
Berdowska, Sylwia
Berdowski, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/1953508.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
acoustical field distribution
reverberation time
definition
mean free path
critical distance
Opis:
The results of the research, which aimed to analyze the acoustic properties of selected sacred buildings located in the city of Częstochowa, Poland are presented in the paper. Three architecturally unusual and completely different from each other churches were selected for the study. The churches differed in shape of their buildings, cubic volume, years of construction, interior furnishings, etc. Nine different objective parameters were used to describe the physical properties of acoustical field in the studied churches. Various factors characterizing the acoustic properties of each building were determined, such as the distribution of sound pressure level (SPL), reverberation time T30, definition D50. Next, they were thoroughly analyzed, so as to ultimately obtain distributions of individual acoustic parameters in the space of the tested building. It allowed to evaluate the quality of the received verbal or musical message depending on the place where the listener was. Further research on speech intelligibility and the musical quality of churches was performed by determining the averaged values of next four objective acoustic parameters: centre time Ts, speech clarity C50, music clarity C80, and speech transmission index (STI). A new approach to analyzing the objective physical parameters describing the sound field was presented in Sec. 4. Mean free path length and critical distance were determined for the investigated acoustic fields in each church and they were associated with a general geometric factor characterizing the complexity of the room shape. The final part of the work presents a comparative analysis of the obtained results of acoustic quality tests of the temples, and thus their usefulness in terms achieving a maximum intelligibility of speech and music. The interesting similarities were found in the spatial distribution of individual acoustic parameters characterizing the distribution of the acoustic field in temples with completely different architecture.
Źródło:
Archives of Acoustics; 2021, 46, 1; 121-133
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Local determinants of foreign direct investment in Poland: the role of relative distance
Autorzy:
Nazarczuk, Jarosław Michał
Krajewska, Anna
Powiązania:
https://bibliotekanauki.pl/articles/22446587.pdf
Data publikacji:
2018
Wydawca:
Instytut Badań Gospodarczych
Tematy:
foreign direct investment
location determinants
spatial distribution of FDI
distance
special economic zones
Opis:
Research background: The increasing role of foreign direct investments (FDI) in global, national, regional, and local economies draws the public's attention to the criteria utilised by foreign investors in undertaking locational decisions, owing to the mostly stimulating character of these kinds of investments.  Purpose of the article: The aim of the article is to identify the local determinants of FDI distribution. Particular attention is put on the role of distance to: (i) various transport endowments; (ii) next special economic zone; (iii) different national borders, among other motives studied in empirical papers. Methods: An important value added over the existing studies is the use of continuous variables representing distances (in km) to selected points of interest (e.g., airport) or minimum distances to lines (i.e., border, road) instead of dummy variables indicating whether particular infrastructure endowment is present in a region. The estimations were run in STATA 14.2 software with the use of a negative binomial approach. Findings & Value added: The results present new empirical evidence on FDI determinants witnessed at a local level of analysis (LAU 1), fitting into the other research done at a higher level of data aggregation (NUTS 2, NUTS 3), signalling high intra-regional inequalities and the role of: (i) relative distance to various infrastructure endowments; (ii) heterogeneous border effects; and (iii) the importance of close proximity to special economic zones. Given the presence of counties? auto selection process (i.e., better developed, endowed, urbanised, favourably located) done by FDI investors, we formulate universal implications in terms of FDI promotion policy.
Źródło:
Equilibrium. Quarterly Journal of Economics and Economic Policy; 2018, 13, 1; 73-88
1689-765X
2353-3293
Pojawia się w:
Equilibrium. Quarterly Journal of Economics and Economic Policy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of multi-objective fruit fly optimisation algorithm based on population Manhattan distance in distribution network reconfiguration
Autorzy:
Tang, Minan
Zhang, Kaiyue
Wang, Qianqian
Cheng, Haipeng
Yang, Shangmei
Du, Hanxiao
Powiązania:
https://bibliotekanauki.pl/articles/1841286.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Chebyshev chaotic mapping
distributed generation
distribution network reconfiguration
fuzzy decision method
Pareto optimal
pmdMOFOA
population Manhattan distance
Opis:
In order to optimise the operation state of the distribution network in the presence of distributed generation (DG), to reduce network loss, balance load and improve power quality in the distribution system, a multi-objective fruit fly optimisation algorithm based on population Manhattan distance (pmdMOFOA) is presented. Firstly, the global and local exploration abilities of a fruit fly optimisation algorithm (FOA) are balanced by combining population Manhattan distance (PMD) and the dynamic step adjustment strategy to solve the problems of its weak local exploration ability and proneness to premature convergence. At the same time, Chebyshev chaotic mapping is introduced during position update of the fruit fly population to improve ability of fruit flies to escape the local optimum and avoid premature convergence. In addition, the external archive selection strategy is introduced to select the best individual in history to save in external archives according to the dominant relationship amongst individuals. The leader selection strategy, external archive update and maintenance strategy are proposed to generate a Pareto optimal solution set iteratively. Lastly, an optimal reconstruction scheme is determined by the fuzzy decision method. Compared with the standard FOA, the average convergence algebra of a pmdMOFOA is reduced by 44.58%. The distribution performance of non-dominated solutions of a pmdMOFOA, MOFOA, NSGA-III and MOPSO on the Pareto front is tested, and the results show that the pmdMOFOA has better diversity. Through the simulation and analysis of a typical IEEE 33-bus system with DG, load balance and voltage offset after reconfiguration are increased by 23.77% and 40.58%, respectively, and network loss is reduced by 57.22%, which verifies the effectiveness and efficiency of the proposed method.
Źródło:
Archives of Electrical Engineering; 2021, 70, 2; 307-323
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 15

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