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Tytuł:
A PPP baseline approach for bridge passing
Autorzy:
Lass, C.
Powiązania:
https://bibliotekanauki.pl/articles/24201435.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
inland waterways
precise point positioning
Global Navigation Satellite System
multisensor data fusion
multi-antenna
navigation and timing
inertial navigation system
rate of turn
Opis:
Global Navigation Satellite Systems (GNSS) are increasingly used as the main source of Positioning, Navigation and Timing (PNT) information for inland water navigation. In order to enable automated driving and facilitate driver assistant functions, it becomes of crucial importance to ensure high reliability and accuracy of the GNSS-based navigation solution, especially in challenging environments. One challenging phase of inland waterway navigation is bridge passing which leads to non-line-of-sight (NLOS) effects such as multipath and loss of tracking. This work presents a Precise Point Positioning (PPP) based algorithm in a two-antenna system where one antenna is at the bow and the other is at the stern. Additionally, gyroscope data from an IMU is used. In contrast to a separated position calculation of the two antennas, only one antenna position is estimated and the other is derived from the baseline between the antennas. This allows for accurate positioning even if one antenna does not receive any GNSS measurements. The presented scheme is evaluated using real measurement data from an inland water scenario with multiple bridges. In comparison with a standard PPP scheme as well as an RTK algorithm, the presented approach shows clear advantages in challenging scenarios.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 1; 33--40
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Alternative maritime radio solutions for enhanced GMDSS network
Autorzy:
Ilcev, D. S.
Powiązania:
https://bibliotekanauki.pl/articles/2172500.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
International Maritime Organization
International Mobile Satellite Organization
Global Maritime Distress
VHF Data Link
MF/HF-band navigation data
radio automatic dependent surveillance-broadcast
VHF data exchange system
Opis:
This paper introduces novel alternative maritime radio solutions for the improved Global Maritime Distress and Safety System (GMDSS) network and equipment within the Very High Frequency (VHF), Medium Frequency (MF) and High Frequency (HF) Ship Radio Station (SRS) terminals. Since its foundiing in 1959, International Maritime Organization (IMO) and its member states, in close co-operation with the International Telecommunication Union (ITU) and other international organizations, notably the World Meteorological Organization (WMO), the International Hydrographic Organization (IHO), the International Mobile Satellite Organization (IMSO) and the Cospas-Sarsat partners, have striven to improve maritime distress and safety radiocommunications, as well as general radiocommunications for operational and personal purposes. This paper also reviews concept of the GMDSS network, an overview of new propsed by author maritime VHF Data Link (VDL), maritime Radio Automatic Dependent Surveillance-Broadcast (RADS-B), an maritime GNSS Augmentation VDL-Broadcast (GAVDL-B). In addition, the type of the current radio Maritime VHF Data Exchange System (VDES), Maritime MF-band Navigational Telex (NAVTEX), and Maritime MF/HF-band Navigation Data (NAVDAT) are also described in this paper.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2022, 16, 2; 259--265
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Alternative maritime satellite solutions for enhanced GMDSS network
Autorzy:
Ilcev, D. S.
Powiązania:
https://bibliotekanauki.pl/articles/2172508.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
International Maritime Organization
Global Maritime Distress and Safety System
Maritime Global Ship Tracking
Maritime GNSS Augmentation Satellite Data Link
Satellite Data Link
Integrated Radio-Automatic Identification System
International Mobile Satellite Organization
Opis:
In this paper are introduced alternative architectures for the novel development of the enhanced Global Maritime Distress and Safety System (GMDSS) satellite communication network and equipment within the Gostationary Erath Orbits (GEO and Non-GEO satellite constellations. Since its founding in 1959, the International Maritime Organization (IMO) and its member states, in close co-operation with the International Telecommunication Union (ITU) and other international organizations, notably the World Meteorological Organization (WMO), the International Hydrographic Organization (IHO), the International Mobile Satellite Organization (IMSO) and Cospas-Sarsat partners, have striven to improve maritime distress and safety radio and satellite communications, as well as general communications for operational and personal purposes. This paper also reviews the principal concept of the GMDSS network, an overview of existing LRIT and maritime Integrated Radio-Automatic Identification System (R-AIS) and Satellite-AIS (S-AIS) networks. In addition, new proposed by author networks of the Satellite Data Link (SDL), Maritime GNSS Augmentation Satellite Data Link (GASDL), Maritime Global Ship Tracking (GST), and Maritime Satellite Automatic Dependent Surveillance-Broadcast (SADS-B) are also described in this paper.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2022, 16, 2; 267--272
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An analysis of the spatial and temporal changes on the Jakobshavn Glacier (Greenland) using remote sensing data
Autorzy:
Olszewska, Katarzyna
Borowiec, Natalia
Powiązania:
https://bibliotekanauki.pl/articles/2055846.pdf
Data publikacji:
2021
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
global warming
glaciers
ablation
glacier calving
remote sensing
Greenland
Opis:
This article presents the problem of climate warming and the effect of melting ice caps. The problem of climate warming is discussed in two stages. In the first stage, the factors affecting global warming are discussed in detail and the effects and risks of ablation extensively described. Analyses were conducted on data available online from NASA and Carbon Dioxide Information Analysis Center. The Greenland area (Jakobshavn Glacier) was selected to visualize glacier calving front changes. The analysis of changes was performed on the selected satellite images covering the summer period (June to September) provided by the Landsat program. Then, the changes in the position of the calving front of the Jakobshavn Glacier were visualized for the period 1985–2020, with a repeatability of every 5 years. Thus, our results addressed the challenges of environmental changes to remote sensing data processing. In addition to the visualization, a surface summary of these changes was presented in the study. The results were discussed in the context of climate change data processed by means of the GIS method. Furthermore, an analysis of the effects of greenhouse gases on glacier surface changes was performed. In summary, the results reveal that satellite imagery is an excellent source of data on which to visualize glacier calving rates, comparing individual layers showing the position of the glacier calving front and calculating the area of calved ice.
Źródło:
Geology, Geophysics and Environment; 2021, 47, 4; 187--201
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of precise point positioning algorithm to support advanced driver assistant functions for inland vessel navigation
Autorzy:
Lass, C.
Ziebold, R.
Powiązania:
https://bibliotekanauki.pl/articles/2063986.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
real tme kinematic
Global Navigation Satellite Systems
state space representation
VHF Data Exchange System
precise point positioning
navigation and timing
Automatic Identification System
inland navigation
Opis:
Bridge passing and passing waterway locks are two of the most challenging phases for inland vessel navigation. In order to be able to automate these critical phases very precise and reliable position, navigation and timing (PNT) information are required. Here, the application of code-based positioning using signals of Global Navigation Satellite Systems (GNSS) is not sufficient anymore and phase-based positioning needs to be applied. Due to the larger coverage area and the reduction of the amount of correction data Precise Point Positioning (PPP) has significant advantages compared to the established Real Time Kinematic (RTK) positioning. PPP is seen as the key enabler for highly automatic driving for both road and inland waterway transport. This paper gives an overview of the current status of the developments of the PPP algorithm, which should finally be applied in advanced driver assistant functions. For the final application State Space Representation (SSR) correction data from SAPOS (Satellitenpositionierungsdienst der deutschen Landesvermessung) will be used, which will be transmitted over VDES (VHF Data Exchange System), the next generation AIS.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2021, 15, 3; 781--789
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Do Instabilities in National Macroeconomic Factors Contribute to Channeling Volatility Spillover from the Global to the Islamic Equity Market?
Czy niestabilność krajowych czynników makroekonomicznych przyczynia się do przenoszenia zmienności stóp zwrotu z globalnego na islamski rynek akcji?
Autorzy:
Muharam, Harjum
Najmudin, Najmudin
Mawardi, Wisnu
Arfinto, Erman Denny
Powiązania:
https://bibliotekanauki.pl/articles/1023545.pdf
Data publikacji:
2021-03-30
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
przenoszenie zmienności
kapitał islamski
model GARCH
model ADCC
dane panelowe
volatility spillover
Islamic equity
GARCH model
ADCC
panel data
Opis:
This study investigates the impact of macroeconomic instabilities on returns volatility spillover that is transmitted from the global to the Islamic equity market. The economic factors examined are the exchange rate, inflation rate, interest rate, and production growth. To achieve the purpose of the study, we utilize three analysis tools: a GARCH(p,q) model to derive values of volatility for all variables; an asymmetry dynamic conditional correlation (ADCC) model to produce a measure of volatility spillover as the dependent variable; and a panel data regression technique to assess the causality significance of macroeconomic factors to volatility spillover. This study is the first which expands such approaches. We observe monthly data of world and Islamic market indices, exchange rates, consumer price indices, interest rates, and industrial production indices. The data, which range from May 2002 to February 2019, are taken from the world market, and twenty-three economies, which consist of fourteen developed and nine emerging markets that have Islamic stock indices. In several sections, we provide important additional analysis for five stock markets in Central European economies, which are compared to the others. The finding suggests that the presence of volatility spillover on the Islamic markets that originates from the global market is affected by the internal instabilities of macroeconomic factors, except for industrial production instability for developed markets, including Central European markets. An implication of the study is that regulators should anticipate and prevent adverse consequences of volatility spillover by arranging their internal economic policy to control inflation rates, interest rates, and industrial production growth, as well as exchange rate flexibility. Moreover, market practitioners should include both global market volatility and macroeconomic instabilities in their prediction to create minimum risk.
Niniejsze badanie dotyczy wpływu niestabilności makroekonomicznej na przenoszenie zmienności stóp zwrotu z globalnego na islamski rynek akcji. Badane czynniki ekonomiczne to kurs walutowy, stopa inflacji, stopa procentowa i wzrost produkcji. Aby osiągnąć cel badania, wykorzystano trzy narzędzia analityczne: model GARCH (p, q) do wyliczania wartości zmienności dla wszystkich zmiennych, model ADCC w celu uzyskania miary wpływu zmienności jako zmiennej zależnej oraz technikę regresji danych panelowych do oceny znaczenia przyczynowości czynników makroekonomicznych w przenoszeniu zmienności. Niniejsze badanie jest pierwszym, które rozszerza takie podejście. Obserwowano miesięczne dane dotyczące światowych i islamskich indeksów rynkowych, kursów walutowych, wskaźników cen konsumpcyjnych, stóp procentowych i wskaźników produkcji przemysłowej. Dane z okresu od maja 2002 do lutego 2019 roku pochodzą z rynku światowego i dwudziestu trzech gospodarek – czternastu rozwiniętych i dziewięciu wschodzących rynków posiadających islamskie indeksy giełdowe. W kilku sekcjach przedstawiono ważne dodatkowe analizy dla pięciu rynków akcji w gospodarkach Europy Środkowej, które są porównywane z innymi rynkami. Wyniki badania sugerują, że na występowanie efektu przenoszenia zmienności wywodzącej się z rynku globalnego na rynki islamskie wpływa wewnętrzna niestabilność czynników makroekonomicznych, z wyjątkiem niestabilności produkcji przemysłowej na rynkach rozwiniętych, w tym na rynkach Europy Środkowej. Z badania wynika, że regulatorzy powinni przewidywać niekorzystne konsekwencje przenoszenia zmienności i zapobiegać im poprzez zorganizowanie wewnętrznej polityki gospodarczej w celu kontrolowania stóp inflacji, stóp procentowych i wzrostu produkcji przemysłowej, a także elastyczności kursu walutowego. Ponadto praktycy rynkowi powinni uwzględnić w swoich prognozach zmienność rynków globalnych i niestabilność makroekonomiczną, tak aby minimalizować ryzyko.
Źródło:
Comparative Economic Research. Central and Eastern Europe; 2021, 24, 1; 103-121
1508-2008
2082-6737
Pojawia się w:
Comparative Economic Research. Central and Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low bandwidth network-RTK correction diissemination for high accuracy maritime navigation
Autorzy:
Alissa, S.
Håkansson, M.
Henkel, P.
Mittmann, U.
Hüffmeier, J.
Rylander, R.
Powiązania:
https://bibliotekanauki.pl/articles/1841552.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
real time kinematic
high accuracy maritime navigation
network-RTK
Global Navigation Satellite System
VHF data exchange system
GNSS receiver
virtual reference station
physical reference stations
Opis:
More than half of the incidents reported to EMSA relate to nautical events such as collision, groundings and contacts. Knowledge of accurate and high-integrity positioning is therefore not only a need for future automated shipping but a base for today’s safe navigation. Examples on accidents include Ever Given in the Suez Canal and HNoMS Helge Ingstad in Norway. A Network-RTK (NRTK) service can be used as an augmentation technique to improve performance of shipborne GNSS receivers for future positioning of manned and unmanned vessels in restricted areas, such as port areas, fairways, and inland water ways. NRTK service providers generate RTK corrections based on the observations of networks of GNSS reference stations which enables the users to determine their position with centimeter accuracy in real-time using a shipborne GNSS receiver. Selection of appropriate communication channels for dissemination of NRTK corrections data is the key to a secure positioning (localization) service. In PrePare-Ships project, the modern maritime communication system VDES (VHF Data Exchange System) is proposed to distribute SWEPOS (NRTK in Sweden) correction data to shipborne positioning modules. VDES is a very reliable technique and it is compatible with most onboard functionalities. In order to minimize the impact on the overall VDES data capacity in a local area, NRTK correction data shall only occupy a single VDES slot with a net capacity of 650 bytes. Update rates may vary but are preferably at 1Hz. However, NRTK correction data size changes instantly, depending on the number of visible GNSS satellites, and the data rate can therefore sometimes reach in excess of 1000 byte/s. In this study, a smart technique is proposed to reduce size of NRTK correction data to instantly adapt with the VDES requirements by choosing a combination of specific signals, satellites or even constellations such that the data rate is not more than 650 byte/s, and at the same time it achieves optimal positioning performance with the accuracy required by the PrePare-Ships project application.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2021, 15, 1; 171-179
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatial and temporal evaluation of global rainfall products in a data-scarce region: The Dez Basin, Iran
Autorzy:
Khoshchehreh, Mostafa
Ghomeshi, Mehdi
Shahbazi, Ali
Bolboli, Hossein
Saberi, Hamed
Gorjizade, Ali
Powiązania:
https://bibliotekanauki.pl/articles/1844366.pdf
Data publikacji:
2021
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
CMORPH
ERA5
ERA-Interim
PERSIANN-CCS
precipitation datasets
reanalysis data
satellite-based precipitation
Opis:
The limitation in approachability to rainfall data sources with an appropriate spatial-temporal distribution is a significant challenge in different parts of the world. The development of general circulation models and mathematical algorithms has led to the generation of various rainfall products as new sources with the potential to overcome the shortage in datascarce basins. In this study, the performance of the PERSIANN-CCS and CMORPH satellite-based rainfall product, as well as the ERA5 and ERA-Interim reanalysis, was evaluated based on detection skill and quantitative metrics in a daily, monthly and seasonal time scales in the Dez basin located in the southwest of Iran. The basin has a wide topographic variation and scattered rain gauge stations. Overall results denote that the ERA5 dataset has the best performance in all statistic verification than other rainfall products. Based on the daily evaluation of all rainfall products, the false alarm rate (FAR) is higher than 0.5, so none of the datasets could capture the temporal variability of rainfall occurrence. This study has covered the western parts of the Zagros steep slopes in which the topographic conditions have a significant effect on the activity of rainfall systems. On a monthly scale, the mean value of the correlation coefficient (CC) for ERA5, ERA-Interim, PER-SIANN-CCS, and CMORPH was equal to 0.86, 0.85, 0.51, 0.39, respectively. The results of seasonal evaluation suggested that all datasets have better rainfall estimation in autumn and winter, and the capability of all datasets dramatically decreased in the spring. The current paper argues that the ERA5 reanalysis typically outperforms ERA-Interim and can be considered as a reliable rainfall source in the future hydrological investigation in the southwest of Iran.
Źródło:
Journal of Water and Land Development; 2021, 48; 148-161
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Suicide rates amongst adolescents A mental health practitioner’s perspective in Poland and a global, Big Data context
Autorzy:
Kulesza, Marta
Odrowaz-Coates, Anna
Perkowska-Klejman, Anna
Powiązania:
https://bibliotekanauki.pl/articles/1627352.pdf
Data publikacji:
2021-09-24
Wydawca:
Fundacja Pedagogium
Tematy:
adolescence
suicide
anomy
social environment
social pedagogy
psychology
mental health
Opis:
The paper contributes to mental health studies of children and youth’s suicide and suicide attempts. Inspired by early sociological concepts such as Durkheim’s contribution to understanding suicide through social anomy, we ran statistical analysis of worldwide suicide rates and tested for correlation between suicide rates amongst children and youth and “Big Data” on social, educational, economic and environmental factors around the world. Amongst them we considered 88 variables including Human Development Index (HDI) and its indicators, rates of religious observance and denomination, and even the hours of sunlight and the average temperature in each country. The statistical section of the paper is preceded by the results of analysis from the anonymised mental health records of adolescents with suicidal and self-harming tendencies. The data came from a Polish psychotherapist and was accompanied by in-depth analysis of contributing factors from purposely selected, attempted suicide cases, in order to enrich the statistical perspective with biological, individual, environmental and situational factors. Finally, we identify trigger factors and protective indicators, derived from both the statistical and the empirical part of our study.
Źródło:
Resocjalizacja Polska; 2021, 21; 461-486
2081-3767
2392-2656
Pojawia się w:
Resocjalizacja Polska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Towards explainable classifiers using the counterfactual approach : global explanations for discovering bias in data
Autorzy:
Mikołajczyk, Agnieszka
Grochowski, Michał
Kwasigroch, Arkadiusz
Powiązania:
https://bibliotekanauki.pl/articles/2031144.pdf
Data publikacji:
2021
Wydawca:
Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:
explainable classifiers
counterfactual approach
bias detection
Opis:
The paper proposes summarized attribution-based post-hoc explanations for the detection and identification of bias in data. A global explanation is proposed, and a step-by-step framework on how to detect and test bias is introduced. Since removing unwanted bias is often a complicated and tremendous task, it is automatically inserted, instead. Then, the bias is evaluated with the proposed counterfactual approach. The obtained results are validated on a sample skin lesion dataset. Using the proposed method, a number of possible bias-causing artifacts are successfully identified and confirmed in dermoscopy images. In particular, it is confirmed that black frames have a strong influence on Convolutional Neural Network’s prediction: 22% of them changed the prediction from benign to malignant.
Źródło:
Journal of Artificial Intelligence and Soft Computing Research; 2021, 11, 1; 51-67
2083-2567
2449-6499
Pojawia się w:
Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Proposed Model to Forecast Hourly Global Solar Irradiation Based on Satellite Derived Data, Deep Learning and Machine Learning Approaches
Autorzy:
Benamrou, Badr
Ouardouz, Mustapha
Allaouzi, Imane
Ben Ahmed, Mohamed
Powiązania:
https://bibliotekanauki.pl/articles/123503.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
solar energy
forecast
global solar irradiation
satellite-derived data
GHI
deep learning
Opis:
An accurate short-term global solar irradiation (GHI) forecast is essential for integrating the photovoltaic systems into the electricity grid by reducing some of the problems caused by the intermittency of solar energy, including rapid fluctuations in energy, management storage, and the high costs of electricity. In this paper, the authors proposed a new hybrid approach to forecast hourly GHI for the Al-Hoceima city, Morocco. For this purpose, a deep long short-term memory network is trained on a combination of the hourly GHI ground measurements from the meteorological station of Al-Hoceima and the satellite-derived GHI from the neighbouring pixels of the point of interest. Xgboost, Random Forest, and Recursive Feature Elimination with cross-validation were used to select the most relevant features, the lagged satellite-derived GHI around the point of interest, as input to the proposed model where the best forecasting model is selected using the Grid Search algorithm. The simulation and results showed that the proposed approach gives high performance and outperformed other benchmark approaches.
Źródło:
Journal of Ecological Engineering; 2020, 21, 4; 26-38
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Big Data - A Complex Analysis of Daily Attitudes as a Modern Inevitable Global Danger
Autorzy:
Lewandowska, Natalia
Powiązania:
https://bibliotekanauki.pl/articles/2015719.pdf
Data publikacji:
2020-09-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
Big Data
globalization
the Fourth Industrial Revolution
Industry 4.0
digitalization
phishing
cybercrimes
Opis:
In the Fourth Industrial Revolution we already have robots, also there are such technologies as genetic sequencing and editing, artificial intelligence, miniaturized sensors, 3D printing and much more. Digital technologies are constantly being developed with new methods and have been implemented worldwide into various processes and automation systems. The article describes modern digitalization components and analyzes its possible threats. Along with an increase in life comfort, modern civilizations must face with cybercrimes based on data collection, including cyber thefts and hacker attacks. Globalization enables exchanging goods and services between countries of the world. It also gives a tool phishing and illegally access vulnerable information of global enterprises to compete unfairly. Although Big Data can be helpful among organizations, it can also be a mark of the inevitable danger worldwide.
Źródło:
Polish Political Science Yearbook; 2020, 3 (49); 134-148
0208-7375
Pojawia się w:
Polish Political Science Yearbook
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling Global Burden of Disease Measures in Selected European Countries Using Robust Dynamic Spatial Panel Data Models
Modelowanie wskaźników obciążenia chorobami w wybranych krajach Europy za pomocą odpornych dynamicznych przestrzennych modeli panelowych
Autorzy:
Orwat-Acedańska, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/660115.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
dynamiczne przestrzenne modele danych panelowych
M-estymacja
efekty ustalone
krótkie panele
miary globalnego obciążenia chorobami
czynniki społeczno-ekonomiczne.
dynamic spatial panel data models (DSPD)
M-estimation
fixed effects
short panels
disease burden measures
socio-economic factors
Opis:
Celem artykułu jest analiza powiązań między wybranymi czynnikami społeczno‑ekonomicznymi a stanem zdrowia mieszkańcow Europy. Stan zdrowia opisywany jest za pomocą wybranych wskaźnikow globalnego obciążenia chorobami – DALY (utracona długość życia korygowana niepełnosprawnością) oraz jego dwoma komponentami: YLL (lata życia z chorobą lub niepełnosprawnością) oraz YLD (lata życia utracone wskutek przedwczesnej śmierci). W opracowaniu zidentyfikowane zostały czynniki, ktore istotnie wpływają na kształtowanie się tych wskaźnikow braku zdrowia. W analizie empirycznej wykorzystano dane panelowe obejmujące 16 krajow, głownie ze „starej UE”, w latach 2003–2013. Do modelowania zależności wskaźnikow globalnego obciążenia chorobami od czynnikow społeczno‑ekonomicznych wykorzystane zostały dynamiczne przestrzenne modele panelowe z efektami ustalonymi (DSPD). Modele te estymowane są za pomocą nowego podejścia (Yanga), polegającego na modyfikacji metody największej wiarygodności i opartego na M‑estymacji tego typu modeli. Metoda ta jest odporna na założenia dotyczące rozkładu tzw. warunkow początkowych. Analiza empiryczna obejmuje specyfikację, estymację oraz statystyczną weryfikację modeli. Wyniki wskazują, że zmienność YLD jest w znacznym stopniu związana ze spożyciem alkoholu, wydatkami na opiekę zdrowotną, wydatkami socjalnymi, tempem wzrostu PKB oraz latami edukacji. Ta sama grupa czynnikow jest związana ze zmiennością DALY. Natomiast wrażliwość składowej YLL na czynniki społeczno‑ekonomiczne jest znacznie słabsza.
The aim of the paper is to study relationships between selected socio‑economic factors and health of European citizens. The health level is measured by selected global burden of disease measures – DALYs (Disability Adjusted Life Years) and its two components: YLL (Years of Life Lost) and YLD (Years Lived with Disability). We identify which factors significantly affect these indicators of health. The empirical study uses a panel data comprising 16 countries mostly from the old‑EU in the period 2003–2013. Fixed‑effects dynamic spatial panel data (DSPD) models are used to account for autocorrelations of the dependent variables across time and space. The models are estimated with a novel, modified quasi maximum likelihood Yang method based on M‑estimators. The approach is robust on the distribution of the initial observations. The empirical analysis covers specification, estimation, and verification of the models. The results show that changes in YLD are significantly related to alcohol consumption, healthcare spending, social spending, GDP growth rate and years of education. Exactly the same set of factors is associated with variation in DALYs. Sensitivity of the YLL component to the socio‑economic factors is considerably weaker.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2020, 2, 347; 109-127
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature and ice regimes of waterbodies under the impacts of global warming and a hydropower plant
Autorzy:
Vyshnevskyi, Viktor Ivanovych
Powiązania:
https://bibliotekanauki.pl/articles/1445111.pdf
Data publikacji:
2020
Wydawca:
Instytut Meteorologii i Gospodarki Wodnej - Państwowy Instytut Badawczy
Tematy:
water temperature
ice cover
Dnipro
Kyivska HPP
reservoir
remote sensing data
Opis:
Based on the results of regular monitoring and remote sensing data the patterns of water temperature and ice regime of the Dnipro River within Kyiv, as affected by global warming and a hydropower plant, were identified. The characteristic features of this stretch of the river are increasing water temperature, and the decreasing thickness and duration of ice cover. The largest water temperature increase is in summer, with a somewhat smaller increase in autumn. The increase of water temperature in spring is much less than the increase in air temperature. In summer, the gradient of water temperature increase is a little bit less than that of air temperature. In autumn, the gradient of water temperature increase is larger than the gradient of air temperature increase. From April to August the lowest water temperature is usually observed near the Kyivska hydropower plant (HPP), which is located upstream. During this period the water temperature downstream from HPP increases. The uneven daily operation of HPP causes the alternation of areas with different temperature along the Dnipro River. In the cold season the water temperature in the Dnipro River is usually higher than in other nearby urban water bodies. Freezing of the water area usually starts from the small and shallow lakes and ponds. The main branch of the Dnipro River freezes last. On the whole, the sequence of ice melting on the waterbodies is the reverse of the freezing process. The longest ice cover duration in spring is observed in the bays with small water exchange, mainly located at a large distance from Kyivska HPP.
Źródło:
Meteorology Hydrology and Water Management. Research and Operational Applications; 2020, 8, 2; 38-45
2299-3835
2353-5652
Pojawia się w:
Meteorology Hydrology and Water Management. Research and Operational Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tidal characteristics in the Gulf of Khambhat, Northern Arabian Sea — based on observation and global tidal model data
Autorzy:
Mitra, A.
Kumar, V.S.
Jena, B.K.
Powiązania:
https://bibliotekanauki.pl/articles/2079079.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
tidal model
sea level
wind
bathymetry
MIKE21 model
FES2014 model
Khambhat Gulf
Arabian Sea
Opis:
Tidal characteristics of the Gulf of Khambhat are described based on measured and modelled sea-level data. Data were recorded at three locations inside and two locations outside the Gulf with record lengths of 6–12 months to study the tidal propagation. A northward increase in tidal amplitude is noticed from Daman (eastern side) and Diu (western side) and attains maxima at Bhavnagar. A similar trend is followed by the amplitude of the major tidal constituents, although there are discrepancies for that of the minor constituents. The non-tidal factor which influences the sea-level is the local wind, especially the alongshore component of wind. A positive correlation is obtained between the sea-level and the meridional component of wind at each location. Harmonic analysis of sea-level data shows that M2 is the major tidal constituent which propagates in a non-linear fashion inside the Gulf. Tides from two global tide models (MIKE21 and FES2014) have been compared with the measured data, which could be used for further prediction of the tides and sediment transport in the Gulf. The tide elevation derived from the MIKE21 model has further been used for the harmonic analysis of tide. The tides predicted using one-month data are up to 10% smaller than those predicted using the one-year data. The global tide model FES2014 data performs well with measured data for offshore locations, whereas it fails to predict the same for the inner Gulf locations. The study manifests the fact that to understand the dynamics of complex tidal areas, regional models should better be used than global tidal models.
Źródło:
Oceanologia; 2020, 62, 4PA; 443-459
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
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