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Wyświetlanie 1-15 z 87
Tytuł:
Equivalence of control systems on the Euclidean group SE (2)
Autorzy:
Adams, R. M.
Biggs, R.
Remsing, C. C.
Powiązania:
https://bibliotekanauki.pl/articles/205696.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
Left-invariant control system
state space equivalence
Euclidean group
Opis:
We classify, under (local) state space equivalence, all full-rank left-invariant control affne systems evolving on the Euclidean group SE(2).
Źródło:
Control and Cybernetics; 2012, 41, 3; 513-524
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
BUDDHISM AND ORTHODOXY IN BURYATIA: RELIGIOUS INTERACTION IN THE CONTEXT OF RUSSIAN IMPERIAL POLITICS
Autorzy:
Amogolonova, Darima
Powiązania:
https://bibliotekanauki.pl/chapters/960502.pdf
Data publikacji:
2020-12-30
Wydawca:
Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego
Tematy:
state identity
spiritual space
Buryats
Buddhism
Orthodoxy
Christianization
Russian Empire
Russification
Opis:
This paper deals with the problems of religious coexistence in late-imperial Russia based on the case of Buryatia. The only state religion – Russian Orthodoxy – saw its task in converting the non-Russians by all possible means and in shortest time. This policy coincided with the interests of the state, as religious homogenization was considered the most effective way to achieve the desired loyalty and patriotism among all subjects of the Empire. Buddhism, which according to the Orthodox clergy was a so-called foreign religion, presented a potential threat to the state, as its believers could be under influences from abroad. The author argues that the secular authorities both in St. Petersburg and in Eastern Siberia faced a dilemma that consisted in the necessity to conduct Russification among non-Russians and simultaneously to strengthen the borders of the Empire in the East. The Buryat subjects were officially allowed to confess Buddhism, since the authorities, being aware of danger from Qing China, needed a balanced policy towards them to avoid discontent and disturbances. Under such conditions, the Orthodox clergy, missionaries in particular, disregarding the damage their intolerance could cause to the state’s interests, became opponents to Siberian officials, accusing them of supporting Buddhism and Buddhist priesthood instead of rendering all possible assistance in the Christianization of non-Russians.
Źródło:
Facing Challenges of Identification: Investigating Identities of Buryats and Their Neighbor Peoples; 135-151
9788323547334
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal control of dynamic systems using a new adjoining cell mapping method with reinforcement learning
Autorzy:
Arribas-Navarro, T.
Prieto, S.
Plaza, M.
Powiązania:
https://bibliotekanauki.pl/articles/205725.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
optimal control
cells mapping
state space
reinforcement learning
stability
nonlinear control
controllability
Opis:
This work aims to improve and simplify the procedure used in the Control Adjoining Cell Mapping with Reinforcement Learning (CACM-RL) technique, for the tuning process of an optimal contro ller during the pre-learning stage (controller design), making easier the transition from a simulation environment to the real world. Common problems, encountered when working with CACM-RL, are the adjustment of the cell size and the long-term evolution error. In this sense, the main goal of the new approach, developed for CACM-RL that is proposed in this work (CACMRL*), is to give a response to both problems for helping engineers in defining of the control solution with accuracy and stability criteria instead of cell sizes. The new approach improves the mathematical analysis techniques and reduces the engineering effort during the design phase. In order to demonstrate the behaviour of CACM-RL*, three examples are described to show its application to real problems. In All the examples, CACM-RL* improves with respect to the considered alternatives. In some cases, CACM- RL* improves the average controllability by up to 100%.
Źródło:
Control and Cybernetics; 2015, 44, 3; 369-387
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reservoir computing and data visualisation
Autorzy:
Ashour, W.
Wang, T. D.
Fyfe, C.
Powiązania:
https://bibliotekanauki.pl/articles/91852.pdf
Data publikacji:
2012
Wydawca:
Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:
reservoir computing
data visualisation
time series
Echo State Networks
ESNs
multidimensional scaling criterion
fixed latent space
Opis:
We consider the problem of visualisation of high dimensional multivariate time series. A data analyst in creating a two dimensional projection of such a time series might hope to gain some intuition into the structure of the original high dimensional data set. We review a method for visualising time series data using an extension of Echo State Networks (ESNs).The method uses the multidimensional scaling criterion in order to create a visualisation of the time series after its representation in the reservoir of the ESN. We illustrate the method with two dimensional maps of a financial time series. The method is then compared with a mapping which uses a fixed latent space and a novel objective function.
Źródło:
Journal of Artificial Intelligence and Soft Computing Research; 2012, 2, 3; 215-222
2083-2567
2449-6499
Pojawia się w:
Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Approximate state-space and transfer function models for 2x2 linear hyperbolic systems with collocated boundary inputs
Autorzy:
Bartecki, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/330464.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
distributed parameter system
hyperbolic equations
approximation model
state space
transfer function
układ o parametrach rozłożonych
równanie hiperboliczne
model aproksymacyjny
przestrzeń stanu
funkcja przesyłowa
Opis:
Two approximate representations are proposed for distributed parameter systems described by two linear hyperbolic PDEs with two time- and space-dependent state variables and two collocated boundary inputs. Using the method of lines with the backward difference scheme, the original PDEs are transformed into a set of ODEs and expressed in the form of a finite number of dynamical subsystems (sections). Each section of the approximation model is described by state-space equations with matrix-valued state, input and output operators, or, equivalently, by a rational transfer function matrix. The cascade interconnection of a number of sections results in the overall approximation model expressed in finite-dimensional state-space or rational transfer function domains, respectively. The discussion is illustrated with a practical example of a parallel-flow double-pipe heat exchanger. Its steady-state, frequency and impulse responses obtained from the original infinite-dimensional representation are compared with those resulting from its approximate models of different orders. The results show better approximation quality for the “crossover” input–output channels where the in-domain effects prevail as compared with the “straightforward” channels, where the time-delay phenomena are dominating.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2020, 30, 3; 475-491
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Semilinear Functional Differential Equations of Fractional order with State-Dependent Delay
Autorzy:
Benchohra, Mouffak
Bennihi, Omar
Ezzinbi, Khalil
Powiązania:
https://bibliotekanauki.pl/articles/746657.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
semilinear functional differential equation, mild solution, resolvent family, fixed point, state-dependent delay, contractive map, Frechet space
Opis:
In this paper we provide sufficient conditions for the existence and uniqueness of mild solutions for a class of semilinear functional differential equations of fractional order with state-dependent delay. The nonlinear alternative of Frigon-Granas type for contractions maps in Frechet spaces combined with \(\alpha\)-resolvent family is the main tool in our analysis.
Źródło:
Commentationes Mathematicae; 2013, 53, 1
0373-8299
Pojawia się w:
Commentationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rare Earth Elements – a Novelty in Energy Security
Autorzy:
Bielawski, Radosław
Powiązania:
https://bibliotekanauki.pl/articles/125452.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
state security
energy security
critical raw materials
rare earth elements
outer space
Opis:
This study analyses the role of rare earth elements (REE) as critical resources for the energy security. This research presents the developments in the global REE extraction, i.e. the dominance of the Republic of China, which attempts to maintain and control its monopoly. The typical and novel uses of rare earth metals were presented in various applications, such as in advanced electronic and information technologies utilised in the aerospace and energy industries. Bearing in mind their vital importance to the manufacturing of high-tech products, the REE deposits are of strategic importance for the USA, the Republic of China and for the European Union. Striving to maintain the independence of raw materials, the USA is focused on the search for raw materials on its territory and furthermore on waiving the legal restrictions with respect to their extraction. China is primarily occupied with maintaining the monopoly and control over the global market of critical raw materials, including REE. The activities within the European Union concentrate on the exploration in search for the REE deposits in Europe and ensuring the continuity of supplies by maintaining good diplomatic relations with partners – the USA and Japan. In addition, extensive REE recycling initiatives are being undertaken in the EU. Further rare earth metals extraction is anticipated to extend to the outer space. However, developing the economically viable methods of extraction remains the major challenge faced by space mining, given that it requires establishing an expensive, permanent space infrastructure. What is more, mining and processing of rare earth metals raises serious environmental concerns, as it involves such hazards as radioactive products, toxic chemical compounds and waste generation. With respect to the environmental protection, this study also addresses the issues of REE substitutes and recycling. It is concluded that the environmental protection practices regarding the long-term extraction and use of REE (with a 2030 horizon) will bring substantial long-term financial benefits.
Źródło:
Journal of Ecological Engineering; 2020, 21, 4; 134-149
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Space as a New Category of Threats to National Security
Autorzy:
BIELAWSKI, Radosław
Powiązania:
https://bibliotekanauki.pl/articles/466208.pdf
Data publikacji:
2019
Wydawca:
Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
Tematy:
space
threats
space law
state security
Opis:
The scientific considerations presented in this paper concern threats to national security arising from the activity in outer space. The objective of this analysis is to identify these dangers and to propose solutions to minimize them. The theoretical research methods employed in this study are: synthesis, analysis, abstracting and generalization. In the course of the analysis, several modern threats were established, including anti-satellite and hypersonic weapons. Another important sphere discussed in the paper is the cyber security of satellite/communication devices and systems operating in space. With respect to satellite systems, the EA-18G Growler electronic warfare aircraft was presented as one of the concepts developed with the capability of disrupting their operation. The results from the conducted study emphasize the need to create a Space Domain Awareness (SDA) system, which is substantiated by the indication of natural threats that must beminimized, namely space debris, space weather and the possibility of collision with Near-Earth Objects. The presented considerations are concluded by the analysis of the legislative state regarding space security, which in reality accentuate the incompatibility of the existing laws with the emerging threats, and other issues concerning space law.
Źródło:
Safety & Defense; 2019, 5, 2; 1-7
2450-551X
Pojawia się w:
Safety & Defense
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robustness of Multimodal Transportation Networks
Model oceny odporności multimodalnych sieci transportowych
Autorzy:
Bocewicz, G.
Powiązania:
https://bibliotekanauki.pl/articles/1366114.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
sieci multimodalne
systemy transportowe
harmonogramowanie cykliczne
odporność na zakłócenia
procesy multimodalne
przestrzeń stanów
cykliczne przebiegi ustalone
multimodal networks
transportation systems
cyclic scheduling
robustness
multimodal processes
state space
cyclic steady state
Opis:
Dynamiczny rozwój infrastruktury komunikacji miejskiej obejmującej linie autobusowe, trolejbusowe, tramwajowe, linie metra, kolei podmiejskiej, itp. składające się na tzw. Multimodalne Sieci Transportowe (MST) rodzi wiele nowych problemów. Wśród ważniejszych z nich warto wymienić problemy planowania obsługi ruchu pasażerskiego w sytuacjach związanych z awariami elementów infrastruktury, wypadkami losowymi czy też z obsługą imprez masowych. Wiadomo, że istnienie rozwiązań dopuszczalnych gwarantujących zakładaną przepustowość infrastruktury warunkuje tzw. odporność MST na ww. zakłócenia. W tym kontekście, niniejsza praca przedstawia pewien deterministyczny model multimodalnej sieci transportowej złożonej z połączonych stacjami przesiadkowymi, linii komunikacji miejskiej. Składające się na sieć, pracujące w zamkniętych cyklach, linie komunikacji miejskiej pozwalają obsłuchiwać ruch pasażerski na wybranych kierunkach np. północ-południe. Obsługiwane strumienie pasażerów modelowane są jako tzw. multimodalne procesy transportowe. Wprowadzone miary odporności MST, umożliwiające ocenę rozważanych wariantów infrastruktury, pozwalają na wyznaczenie warunków spełnienie, których gwarantuje dopuszczalną jakość obsługi ruchu pasażerskiego. Umożliwiają, zatem zarówno planowanie obsługi pasażerów na wybranych trasach, jak i kształtowanie struktury rozbudowywanej i/lub modernizowanej sieci komunikacji miejskiej.
This paper describes a declarative approach to modeling a multimodal transportation network (MTN) composed of multiple connecting transport modes, such as bus, tram, light rail, subway and commuter rail, where within each mode, service is provided on separate lines or routes. The considered model of a network of multimodal transportation processes (MTPN) provides a framework to address the needs for transportation networks robustness while taking into account their capacity and demand requirements. Therefore the work focuses on evaluation of the network robustness allowing distinguished multimodal processes to continue in order to accomplish trips following an assumed set of multimodal chains connecting transport modes between origins and destinations. Consequently, a solution to the problem of prototyping robust transits on a given multimodal network is implemented and tested. The conditions that guarantee the network robustness, taking into account disruptions of supply and demand as well as operational control, are provided. The aim of investigations is to provide a tool for evaluating the robustness of a network of multimodal transportation processes as well as different travel modes through a transportation network.
Źródło:
Eksploatacja i Niezawodność; 2014, 16, 2; 259-269
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adaptive prediction of stock exchange indices by state space wavelet networks
Autorzy:
Brdyś, M. A.
Borowa, A.
Idźkowiak, P.
Brdyś, M. T.
Powiązania:
https://bibliotekanauki.pl/articles/907656.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
prognozowanie
giełda
sztuczna inteligencja
wyżarzanie symulowane
forecasting
stock exchange
artificial intelligence
state space wavelet network
simulated annealing
Opis:
The paper considers the forecasting of the Warsaw Stock Exchange price index WIG20 by applying a state space wavelet network model of the index price. The approach can be applied to the development of tools for predicting changes of other economic indicators, especially stock exchange indices. The paper presents a general state space wavelet network model and the underlying principles. The model is applied to produce one session ahead and five sessions ahead adaptive predictors of the WIG20 index prices. The predictors are validated based on real data records to produce promising results. The state space wavelet network model may also be used as a forecasting tool for a wide range of economic and non-economic indicators, such as goods and row materials prices, electricity/fuel consumption or currency exchange rates.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2009, 19, 2; 337-348
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adaptive predictions of the euro/złoty currency exchange rate using state space wavelet networks and forecast combinations
Autorzy:
Brdyś, M. A.
Brdyś, M. T.
Maciejewski, S. M.
Powiązania:
https://bibliotekanauki.pl/articles/330138.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
currency exchange rate
artificial intelligence
state space wavelet network
Metropolis Monte Carlo
forecast combinations
data generating process
kurs wymiany walut
sztuczna inteligencja
sieć falkowa
Opis:
The paper considers the forecasting of the euro/Polish złoty (EUR/PLN) spot exchange rate by applying state space wavelet network and econometric forecast combination models. Both prediction methods are applied to produce one-trading-day-ahead forecasts of the EUR/PLN exchange rate. The paper presents the general state space wavelet network and forecast combination models as well as their underlying principles. The state space wavelet network model is, in contrast to econometric forecast combinations, a non-parametric prediction technique which does not make any distributional assumptions regarding the underlying input variables. Both methods can be used as forecasting tools in portfolio investment management, asset valuation, IT security and integrated business risk intelligence in volatile market conditions.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2016, 26, 1; 161-173
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The field of sequential Monte Carlo methods
Autorzy:
Brzozowska–Rup, Katarzyna
Dawodowicz, Antoni Leon
Powiązania:
https://bibliotekanauki.pl/articles/748652.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
model przestrzeni stanów, ukryte procesy Markowa, filtracja optymalna, sekwencyjne metody Monte Carlo, sekwencyjna funkcja ważności, „re-próbkowanie”
state-space models, hiddenMarkov model, optimal filtering, sequential Monte Carlo, sequential importance sampling, resampling.
Opis:
Celem pracy jest zaprezentowanie idei metod filtracji opartych na sekwencyjnej metodzie Monte Carlo, w literaturze nazywanych również metodami filtru cząsteczkowego oraz odniesienia do odpowiedniej literatury. Istotę omawianych algorytmów przedstawiamy rozważając problem estymacji silnie nieliniowych i niegaussowskich modeli przestrzeni stanów. W praktyce bowiem w takich przypadkach dobrze znany i najczęściej wykorzystywany algorytm rozszerzonego filtru Kalmana (ang. Extended Kalman Filter, EKF) może wykazywać istotną nieefektywność. Idea filtru cząsteczkowego polega na estymacji rozkładu prawdopodobieństwa rozkładem empirycznym wyznaczonym na podstawie cząsteczek, tzw. „chmury punktów”. Zaimplementowanie algorytmu filtru cząsteczkowego wymaga zasadniczo przeprowadzenia trzech procedur: (1) losowania cząsteczek z odpowiednio dobranej sekwencyjnej funkcji ważności, (2) określenia istotności cząsteczek, (3) powtórnego losowania, tzw. resampling. Metody te są coraz bardziej popularnew dziedzinie ekonomii, statystyki, medycynie i teorii sygnałów.
This paper provides an introduction to the field of sequential Monte Carlo methods which are also known as particle filters methods. The best known algorithm to solve the problem of non-linear non-Gaussian filtering is the Extended Kalman Filter (EKF) but in settings where the dynamics are significantly non-linear or the noise intensities are high, the EKF can perform quite poorly. Particle filtering methods are powerful tools for online estimation and tracking in nonlinear and non-Gaussian dynamical systems. The basic idea is to approximate the transition probability density function by a discrete cloud of points, called particles. They commonly consistof three steps:(1) drawing samples in the state-space of the system,(2) computing proper importance weights of each sample and(3) resampling.These methods are becoming increasingly popular in economics and finance so the objective of this paper is to explain the basic assumptions of the methodology and provide references to relevant literature.
Źródło:
Mathematica Applicanda; 2009, 37, 51/10
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification and Estimation of Initial Conditions in Non-Minimal State-Space Models
Autorzy:
Bystrov, Victor
Powiązania:
https://bibliotekanauki.pl/articles/2075239.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
identification
latent variables
state-space model
redundancy
Opis:
In this paper the identification problem is considered for initial conditions in a non-minimal state-space model that includes interpretable state variables generated by non-stationary stochastic processes. In order to solve the identification problem, structural restrictions are imposed on initial conditions in a state-space model with redundant state variables. The corresponding restricted maximum likelihood estimator of initial conditions is derived. The restricted estimator of initial conditions can be used in order to compute uniquely identified realizations of interpretable latent variables. The identification problem is illustrated analytically using a simple structural economic model
Źródło:
Central European Journal of Economic Modelling and Econometrics; 2020, 4; 413-429
2080-0886
2080-119X
Pojawia się w:
Central European Journal of Economic Modelling and Econometrics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measuring the Natural Rates of Interest in Germany and Italy
Autorzy:
Bystrov, Victor
Powiązania:
https://bibliotekanauki.pl/articles/2076225.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
natural rate of interest
potential output
euro area
state-space model
Kalman filter
Opis:
In this paper a semi-structural econometric model is implemented in order to estimate the natural rates of interest in two large economies of the Euro Area: Germany an Italy. The estimates suggest that after the financial crisis of 2007–2008 a decrease of the growth rate of potential output and the corresponding natural rate of interest was greater in Italy than in Germany which could have had important implications for the effectiveness of a common monetary policy. Unlike in other studies, it is found that the monetary policy stance was less expansionary in Italy as compared to Germany for the whole after-crisis period.
Źródło:
Central European Journal of Economic Modelling and Econometrics; 2018, 4; 333-353
2080-0886
2080-119X
Pojawia się w:
Central European Journal of Economic Modelling and Econometrics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The observational equivalence of natural and unnatural rates of interest
Autorzy:
Bystrov, Victor
Powiązania:
https://bibliotekanauki.pl/articles/1046640.pdf
Data publikacji:
2020
Wydawca:
Główny Urząd Statystyczny
Tematy:
natural rate of interest
state-space model
observational equivalence
Opis:
The results of the study presented in this paper demonstrate that a structural model of the natural interest rate, which is consistent with the standard assumptions of the natural rate theory, admits an interpretable, observationally equivalent representation in which a redefined, 'unnatural' equilibrium rate is different from the natural rate in the original model. The alternative representation was obtained by an invertible transformation implemented in the minimal state-space form of the natural-rate model. The identification theory for state-space models is used in the paper to prove the observational equivalence of these two representations. In the alternative representation, the equilibrium interest rate fails to meet the assumption of the natural rate theory, because it depends on past demand shocks. The alternative model, being observationally equivalent, has different implications for the conduct of monetary policy. The problem of observational equivalence arises in relation to natural-rate models because of the inherent unobservability of the natural interest rate; a potential solution to this problem could be the augmentation of the information set which is used to identify and estimate the natural rate.
Źródło:
Przegląd Statystyczny; 2019, 66, 3; 183-199
0033-2372
Pojawia się w:
Przegląd Statystyczny
Dostawca treści:
Biblioteka Nauki
Artykuł
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