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    Wyświetlanie 1-8 z 8
    Tytuł:
    Semi-automatic watershed merging method
    Autorzy:
    Smołka, J.
    Skublewska-Paszkowska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/106178.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
    Tematy:
    watershed
    hierarchical cluster analysis
    colour images
    segmentation
    Opis:
    Watershed transformation frequently produces over-segmented images. The authors propose a solution to this problem. It utilizes hierarchical cluster analysis for grouping watersheds which are treated as objects characterized by a number of attributes. Initially the watershed merging method was meant only for gray-scale images, but later it was adapted for colour images. This paper presents further extension of the method that allows it to either automatically select the numberof classes or to provide a hint as to which numbers in a specified range should be considered first.Segmentation quality assessment functions for colour images are presented. The results obtained using an extended watershed merging method are discussed. The examples of segmentations selected by the method, along with the graphs of assessment functions, are shown.
    Źródło:
    Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica; 2013, 13, 1; 89-97
    1732-1360
    2083-3628
    Pojawia się w:
    Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An identification source of variation on the water quality pattern in the Malacca River basin using chemometric approach
    Autorzy:
    Hua, A. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/204612.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hierarchical cluster analysis
    discriminant analysis
    principal component analysis
    multiple linear
    regression analysis
    Opis:
    The Malacca River basin experienced river water pollution which caused a major deterioration to the ecosystems and environmental health. This study is carried out to assess the water quality data and identify the pattern of water pollution sources in the study area, and also to develop a predictive performance of water quality in the Malacca River basin. A chemometric approach using a combination of HCA, DA, PCA, and MLR, was applied into twenty water quality variables from nine sampling stations that were collected from January until December of 2015 in the river basin. HCA pointed out three clusters, namely Cluster 1 (C1) with low pollution source, Cluster 2 (C2) with moderate pollution source, and Cluster 3 (C3) with high pollution source. In the DA analysis, the results showed 21 variables, 12 variables, and 9 variables for standard mode, forward stepwise mode, and backward stepwise mode, respectively. Meanwhile, the PCA indicated that the main source of pollutants is detected from residential, industrial, commercial, agricultural, animal livestock, as well as forest land. Among the three models developed from MLR analysis, C3 with a high pollution source is detected to be the most suitable model to be used for the prediction of Water Quality Index in the Malacca River basin. This study proposed for an effective river water quality management by having new water quality monitoring network to be designed for more practical use in order to reduce time and effort, as well as cost saving purposes.
    Źródło:
    Archives of Environmental Protection; 2018, 44, 4; 111-122
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of cropping intensity and irrigation intensity in North Twenty Four Parganas district, West Bengal, India
    Autorzy:
    Mondal, Tarun Kumar
    Sarkar, Santana
    Powiązania:
    https://bibliotekanauki.pl/articles/1954987.pdf
    Data publikacji:
    2021-12-10
    Wydawca:
    Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
    Tematy:
    Cropping intensity
    hierarchical cluster analysis
    irrigation intensity
    ANOVA
    residual mapping
    Opis:
    An attempt has been made in this paper to analyse the spatio-temporal variations of cropping intensity and irrigation intensity, and their relationship, in North Twenty Four Parganas district in West Bengal, India from 1996/97 to 2015/16. The relationship between cropping intensity and irrigation intensity has been assessed using partial correlation, residual mapping and hierarchical cluster analysis. One-way ANOVA has been conducted for testing the equality of cluster means. Temporal analysis from 1996/97 to 2015/16 has shown a low positive correlation between cropping intensity and irrigation intensity for the entire district. Analysis at Agricultural Block level has revealed that cropping intensity decreased in many cases even after an increase in irrigation intensity. In general, cropping intensity has increased with the increase in irrigation intensity in the Coastal Saline Region and the Ichhamati Basin, whereas cropping intensity has increased even after a decrease in irrigation intensity in the Gangetic Plains Region in the district.
    Źródło:
    Miscellanea Geographica. Regional Studies on Development; 2021, 25, 4; 246-258
    0867-6046
    2084-6118
    Pojawia się w:
    Miscellanea Geographica. Regional Studies on Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Multivariate Statistical Methods to the Hydrochemical Study of Groundwater Quality in the Sahel Watershed, Algeria
    Autorzy:
    Hakim, Djafer Khodja
    Amina, Aichour
    Amina, Rezig
    Djouhra, Baloul
    Ahmed, Ferhati
    Powiązania:
    https://bibliotekanauki.pl/articles/2173331.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    hydrochemical analysis
    water quality
    groundwater
    principal component analysis
    hierarchical cluster analysis
    Sahel watershed
    Opis:
    The quality of groundwater is characterized by several numbers of physical and chemical parameters, which determine the use of water (water supply, irrigation, industry). This search paper is a contribution made to know the hydrochemical characteristics of groundwater in the Sahel sub-catchment which belongs to the large Soummam North basin of Algeria. Different multivariate statistical techniques were used such as principal component analysis (PCA), Hierarchical Cluster Analysis (HCA) and Diagram Analysis. These analyses are exercised to a dataset formed from 37 boreholes with 12 chemical variables over the entire surface of the watershed. The samples were collected in 2016. The 37 boreholes are one of the main water resources that supply the wilaya of Bouira with drinking water and irrigation. The analysis of water quality using different methods (ACP, HCA and Diagram) resulted in two chemical kinds: (Chloride, calcium sulfate and magnesium), and (Bicarbonate calcium and magnesium). The results have shown that 74% of the boreholes were contaminated, the rest of boreholes were characterized by a good quality and they have not suffered any contamination and can be consumed without any risk.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 8; 341--349
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Use of Multivariate Statistical Analysis of Hydrochemical Data for the Identification of the Geochemical Processes in the Tirana-Fushe Kuqe Alluvial Aquifer, North-Western Albania
    Autorzy:
    Raço, Endri
    Beqiraj, Arjan
    Cenameri, Sabina
    Jahja, Aurela
    Powiązania:
    https://bibliotekanauki.pl/articles/2173334.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    Tirana-Fushe Kuqe aquifer
    groundwater
    multivariate analysis
    principal component analysis
    hierarchical cluster analysis
    Opis:
    During the research, 71 groundwater samples were collected over a 300 km2 area of Tirana-Fushe Kuqe alluvial aquifer extension (central-western Albania) and subsequently analyzed for 11 parameters (pH, K+, Na+, Ca2+, Mg2+, HCO3-, Cl-, SO42-, NO3-, TH and TDS). Both geochemical conventional (Piper and Chadha diagrams) methods of groundwater classification and multivariate statistical (principal components analysis – PCA and hierarchical cluster analysis – HCA) methods were applied to the dataset to evidence the geochemical processes controlling groundwater geochemistry evaluation through the aquifer. The conventional geochemical methods revealed four (G1–G4) hydrochemical groups where the dominant group is G2 the samples of which are from unconfined to semiconfined recharge zone and the majority of them have Ca-Mg-HCO3 groundwater. Group G3 includes the samples from the confined coastal aquifer having Na-Cl groundwater. Group G1 includes three groundwater samples of Ca-Mg-SO4 from the central part of the aquifer, while group G4, the samples of which are spatially located between G3 and G2 zones, has Na-HCO3 groundwater. The first four components of the PCA account for 85.35% of the total variance. Component PC1 is characterized by very high positive loadings of TH, Ca2+, and Mg2+, suggesting the importance of dissolution processes in the aquifer recharge zone. Component PC2 is characterized by very high positive loadings in Na+, K+, and Cl-and moderate to high loadings of TDS, revealing the involvement of seawater intrusion and diffusion from clay layers. On the basis of their variable loadings, the first two components are defined as the “hardness” and “salinity”, respectively. The HCA produced four geochemically distinct clusters, C1–C4. The samples of cluster C1 are from the coastal confined aquifer and their groundwater belongs to the Na-Cl type. The samples from cluster C2 are located in the south and east recharge areas and most of them have Ca–Mg–HCO3 groundwater, while the samples from cluster C3, which are located in the northeastern recharge zone, have Mg-Ca–HCO3 groundwater. Finally, cluster C4 includes two groundwater subgroups having Na-Cl-HCO3 and Na-Mg-Cl-HCO3 groundwater in the vicinity of cluster C1 as well as Na-HCO3-Cl and Na-Mg-HCO3-Cl groundwater next to cluster C2 and C3.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 8; 327--340
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of binary data transformation in categorical data clustering
    Autorzy:
    Cibulková, Jana
    Šulc, Zdenek
    Sirota, Sergej
    Rezanková, Hana
    Powiązania:
    https://bibliotekanauki.pl/articles/1194463.pdf
    Data publikacji:
    2019-07-02
    Wydawca:
    Główny Urząd Statystyczny
    Tematy:
    hierarchical cluster analysis
    nominal variable
    binary variable
    categorical data
    similarity measures
    evaluation criteria
    generated data
    Opis:
    This paper focuses on hierarchical clustering of categorical data and compares two approaches which can be used for this task. The first one, an extremely common approach, is to perform a binary transformation of the categorical variables into sets of dummy variables and then use the similarity measures suited for binary data. These similarity measures are well examined, and they occur in both commercial and non-commercial software. However, a binary transformation can possibly cause a loss of information in the data or decrease the speed of the computations. The second approach uses similarity measures developed for the categorical data. But these measures are not so well examined as the binary ones and they are not implemented in commercial software. The comparison of these two approaches is performed on generated data sets with categorical variables and the evaluation is done using both the internal and the external evaluation criteria. The purpose of this paper is to show that the binary transformation is not necessary in the process of clustering categorical data since the second approach leads to at least comparably good clustering results as the first approach.
    Źródło:
    Statistics in Transition new series; 2019, 20, 2; 33-47
    1234-7655
    Pojawia się w:
    Statistics in Transition new series
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Institutional Quality and its Impact on FDI Inflow: Evidence from the EU Member States
    Jakość instytucjonalna i jej wpływ na zagraniczne inwestycje bezpośrednie: przykład państw członkowskich Unii Europejskiej
    Autorzy:
    Dobrowolska, Bogusława
    Dorożyński, Tomasz
    Kuna‑Marszałek, Anetta
    Powiązania:
    https://bibliotekanauki.pl/articles/2033924.pdf
    Data publikacji:
    2021-12-17
    Wydawca:
    Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
    Tematy:
    ZIB
    instytucje
    jakość instytucjonalna
    hierarchiczna analiza skupień
    państwa członkowskie Unii Europejskiej
    FDI
    institutions
    institutional quality
    hierarchical cluster analysis
    EU Member States
    Opis:
    The aim of the article is to assess institutional quality in 28 EU Member States and to examine the relationship between the quality of institutions and FDI inward stock as % of GDP. This study is structured as follows. Firstly, we reviewed studies dedicated to the relationship between institutional quality and investment attractiveness. Then, we discussed FDI inflow into the EU countries and selected diagnostic variables that later served as the basis for our research in which we used categories of the Global Competitiveness Index. Based on rankings and using statistical methods, in the next stage, we divided the EU Member States into groups representing similar institutional quality. Then we investigated the relationships between groups of countries similar to one another when it comes to institutional quality and groups of countries ranked in ascending order by the value of foreign direct investment inflow measured as FDI inward stock as % of GDP. The study demonstrated that the EU Member States differ with respect to institutional quality. The results of the statistical analysis have provided grounds to positively verify the hypothesis about a positive relationship between the level of institutional quality and investment attractiveness.
    Celem artykułu jest ocena jakości instytucjonalnej w 28 państwach członkowskich UE oraz próba oceny zależności pomiędzy jakością instytucjonalną a poziomem napływu zagranicznych inwestycji bezpośrednich (ZIB). Opracowanie ma następującą strukturę. Po pierwsze, dokonaliśmy przeglądu badań poświęconych związkom między jakością instytucjonalną a atrakcyjnością inwestycyjną. Następnie omówiliśmy napływ ZIB do krajów UE i wybraliśmy zmienne diagnostyczne, które posłużyły za podstawę do dalszej analizy. W tym celu posłużyliśmy się miernikami Globalnego Indeksu Konkurencyjności. W kolejnym etapie wykorzystując rankingi i metody statystyczne podzieliliśmy państwa członkowskie UE na grupy o zbliżonym poziomie jakości instytucjonalnej. Następnie zbadaliśmy zależności między podobnymi do siebie grupami krajów oraz grupami państw uszeregowanych według wartości napływu ZIB jako % PKB. Badanie wykazało, że państwa członkowskie UE różnią się wyraźnie pod względem jakości instytucjonalnej. Wyniki analiz statystycznych dały podstawę do pozytywnej weryfikacji hipotezy o pozytywnym związku między poziomem jakości instytucjonalnej a atrakcyjnością inwestycyjną.
    Źródło:
    Comparative Economic Research. Central and Eastern Europe; 2021, 24, 4; 23-44
    1508-2008
    2082-6737
    Pojawia się w:
    Comparative Economic Research. Central and Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza podobieństwa rodzin mieszańcowych truskawki powtarzającej owocowanie pod względem wielkości i jakości plonu owoców
    Analysis of the similarities between hybrid families of everbearing strawberry in relation to fruit yield and quality
    Autorzy:
    Sieczko, Leszek
    Masny, Agnieszka
    Mądry, Wiesław
    Żurawicz, Edward
    Powiązania:
    https://bibliotekanauki.pl/articles/41510559.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Hodowli i Aklimatyzacji Roślin
    Tematy:
    hierarchiczna analiza skupień
    analiza składowych głównych
    cechy jakości owoców
    plon owoców
    truskawka powtarzająca owocowanie
    hierarchical cluster analysis
    principal components analysis
    characteristics of fruit quality
    fruit yield
    everbearing strawberry
    Opis:
    W pracy podjęto próbę wyznaczenia związków pomiędzy plonem owoców truskawki powtarzającej owocowanie i cechami jakości owoców. Użyte do analizy statystycznej dane (wyniki) oceny polowej 1280 siewek, należących do 32 rodzin mieszańcowych pochodziły z Instytutu Sadownictwa i Kwiaciarstwa w Skierniewicach. Zmienność obiektów badano z użyciem analizy składowych głównych, a następnie zastosowano hierarchiczną analizę skupień metodą Warda do wydzielania 3 grup jednorodnych.
    The paper describes the attempt made to determine the relationships between fruit yield and quality of everbearing strawberry. The results of field evaluation of 1280 strawberry seedlings belonging to 32 hybrid families came from the Institute of Pomology and Floriculture in Skierniewice. Variability of the experimental objects was evaluated using the principal components analysis. Afterwards, Ward’s hierarchical clustering method was applied to distinguish homogeneous groups of objects.
    Źródło:
    Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin; 2008, 250; 297-307
    0373-7837
    2657-8913
    Pojawia się w:
    Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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