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Wyświetlanie 1-15 z 282
Tytuł:
Using AI Chatbot for Math Tutoring
Autorzy:
Jančařík, Antonín
Michal, Jakub
Novotná, Jarmila
Powiązania:
https://bibliotekanauki.pl/articles/18770350.pdf
Data publikacji:
2023
Wydawca:
Fundacja Pro Scientia Publica
Tematy:
artificial intelligence
tutoring
mathematics education
time analysis
chatbots
Opis:
Aim. The aim of this paper is to present the results of a pilot validation of an artificial intelligence chatbot for mathematics tutoring. The subject of the analysis is the behaviour of the students in the course, in particular their approach to solving problems without external motivation through scoring or other assessment. Methods. The analysis of student behaviour was carried out on the basis of records in the application database. The subject of the analysis was not only the pupils' responses, but also the time taken to produce them and the overall trajectory through the course. Results. The results of the analysis show that students who choose to join the course, work intensively in the lessons. Most pupils solve more than one basic task. A significant proportion of pupils also use the prepared help and instructional videos. The analysis of the solution time allowed identification of a group of pupils who do not even read the problems and only confirm the results. Conclusion. The pilot validation confirmed that the chat-bot format is close to the learners, and they are able to use the courses created in this environment. Solution time analysis suggests that this parameter can be used to analyse learner behaviour and system control. Further analyses in this area are needed.
Źródło:
Journal of Education Culture and Society; 2023, 14, 2; 285-296
2081-1640
Pojawia się w:
Journal of Education Culture and Society
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Space-time analysis of the phenomenon of unemployment in the group of new eu member states
Autorzy:
Balcerowicz-Szkutnik, Maria
Powiązania:
https://bibliotekanauki.pl/articles/424837.pdf
Data publikacji:
2013
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
labour market
employment
unemployment
age structure
space-time analysis
Opis:
The article shows in a synthetic way the problems of unemployment in the ten states that newly accessed the EU in 2004. Special attention was paid to long-term unemployment. The period of time from 2000 to 2011, that was selected for the purpose of the analysis, includes the years that directly preceded and directly followed accession to the EU. This was to show the possible changes in intensity of this phenomenon in the selected countries.
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2013, 1(39); 11-21
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Response-time analysis of a CAN network used for supervisory control and diagnostic systems
Autorzy:
Werewka, J.
Dach, M.
Powiązania:
https://bibliotekanauki.pl/articles/970223.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
real-time systems
scheduling
distributed systems
fieldbus
real time analysis
CAN
CANopen
Opis:
This paper refers to construction methods of Supervisory Control and Diagnostic Systems (SCDS) based on a CAN bus. Emphasis is put on the construction of such systems. Meeting real time constraints has become one of major aspects of this elaboration. The study enumerates possibilities of using various communication mechanisms of CAN, applicable for real-time systems. Proposed solutions are especially suitable for general-purpose SCDS. Principles of real-time analysis for CAN bus based systems are discussed as well. An example of SCDS implementation for a Swiss Light Source (SLS) large scale accelerator project is given. Time analysis is made for the constructed system with real-time conditions met. Experiments performed in the SLS confirm the results of the analysis.
Źródło:
Control and Cybernetics; 2010, 39, 4; 1135-1157
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Designing a More Effective Supply Chain
Autorzy:
Wild, Tony
Powiązania:
https://bibliotekanauki.pl/articles/504543.pdf
Data publikacji:
2019
Wydawca:
Międzynarodowa Wyższa Szkoła Logistyki i Transportu
Tematy:
inventory
supply chain
inventory reduction
supply chain efficiency
process mapping
time analysis
Opis:
Supply chain can be considered as a series of linked inventories. This paper considers the impact of inventory on the economics of the businesses and the whole chain and discusses causes of inefficiency. In most supply chains the goods are inactive for the majority of the time, and this leads to longer term and therefore less accurate forecasting. The result is typically excess inventory, shortages, and inflexibility. By analysing the wasted time and costs in the supply chain, a clearer view of the whole process can be created. Total supply time can be considered as three components, namely value added time, non-value added process time, and waste time. This basic approach shows where improvements should be focussed. Using this time-based measurement enables more relevant comparison between supply chains than the normal supply chain efficiency ratio.
Źródło:
Logistics and Transport; 2019, 42, 2; 35-40
1734-2015
Pojawia się w:
Logistics and Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Degradation-Threshold-Shock model for a system. The case of dependent causes of failure in finite-time
Autorzy:
Caballé, N. C.
Castro, I. T.
Powiązania:
https://bibliotekanauki.pl/articles/2069176.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
condition-based maintenance
degradation-threshold-shock models
finite-time analysis
gamma process
Opis:
This paper deals with a condition-based maintenance strategy (CBM) in finite-time horizon for a system subject to two different causes of failure, internal degradation and sudden shocks. Internal degradation is modelled under a gamma process and sudden shocks arrive at the system following a non-homogeneous Poisson process (NHPP). Both causes of failure are considered as dependent. When a sudden shock takes places, the system fails. In addition, the system is regarded to fail when the deterioration level reaches a critical threshold. Under this functioning scheme, a CBM strategy is developed for controlling the reliability of the system. Traditionally, this strategy is developed under an asymptotic approach. Hence, considering an infinite-time horizon is not always possible. In this paper, we analyse a CBM strategy under a finite-time horizon developing a recursive method which estimates the expected cost rate based on numerical integration and Monte Carlo simulation. A numerical example is provided in order to illustrate this complex maintenance model.
Źródło:
Journal of Polish Safety and Reliability Association; 2016, 7, 1; 13--20
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Logistics Systems Maintenance Modelling Problems - the Use of TDA Approach
Autorzy:
Werbińska-Wojciechowska, Sylwia
Powiązania:
https://bibliotekanauki.pl/articles/503872.pdf
Data publikacji:
2012
Wydawca:
Międzynarodowa Wyższa Szkoła Logistyki i Transportu
Tematy:
time-delay analysis
logistics system performance inspection model
Opis:
The article presents an overview of some recent developments in the area of mathematical modelling of maintenance decisions with the use of time-delay and time-delay analysis. Thus, the literature overview in the investigated area is provided. The problem of time relations occurred in supply chain performance process is investigated. Later, there are presented obtained reliability analysis results in comparison with the knowledge about the case company present con-dition. The article investigates the possibilities of basic time delay model implementation in the area of logistic sys-tem of sixteen forklifts performance analysis.
Źródło:
Logistics and Transport; 2012, 15, 2; 63-74
1734-2015
Pojawia się w:
Logistics and Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The synchrosqueezing method in bearing estimation of stationary signals for passive sonar with towed array
Autorzy:
Czarnecki, K.
Leśniak, W.
Powiązania:
https://bibliotekanauki.pl/articles/332264.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
reassignment method
time-frequency analysis
direction of arrival
Opis:
In this paper a novel method of the bearing estimation in a passive sonar system with a towed array is introduced. The classical approach of the bearing estimation based on the spatial spectrum is extended by using the synchrosqeezing method that is a part of the reassignment method introduced by Kodera et al. The usage of this method leads to the precise bearing estimation. The proposed method requires a relatively small amount of computation, because of possibility of using the FFT algorithm. Moreover, method immunity against AWGN is tested for a selected sonar array having regard to the direction of arrival and the signal frequency.
Źródło:
Hydroacoustics; 2015, 18; 41-46
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of capital markets in Bulgaria, Romania and Slovakia in years 2001-2009
Autorzy:
Kompa, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/452985.pdf
Data publikacji:
2012
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki
Tematy:
emerging capital markets
stock index
time series analysis
Opis:
The aim of research is evaluation of the development of stock exchanges in Sofia, Bucharest and Bratislava in the years 2000-2009. The analysis is provided for the logarithmic rates of return of main stock indexes quoted in the investigated countries, employing central tendency, dispersion and skewness measures as well as statistical inference. The research is provided for the whole period and for the sub-periods that are distinguished due to the general tendency at capital markets.
Źródło:
Metody Ilościowe w Badaniach Ekonomicznych; 2012, 13, 2; 48-59
2082-792X
Pojawia się w:
Metody Ilościowe w Badaniach Ekonomicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A New Optimization Algorithm for Dilation and Erosion
Autorzy:
Yin, K.
Powiązania:
https://bibliotekanauki.pl/articles/108794.pdf
Data publikacji:
2011
Wydawca:
Społeczna Akademia Nauk w Łodzi
Tematy:
dilation
erosion
optimization
iteration algorithm
time complexity analysis
Opis:
Effectively optimizing dilation and erosion is an extensively studied but not completely resolved problem. In this paper, a new optimization algorithm is proposed to improve the efficiency of dilation and erosion. Four notions are given to define the edges for any simply connected structuring element (SE). An assistant algorithm is proposed to detect these edges. Based on these notions, three iteration equations can be derived, which redefine dilation and erosion as iteration calculation. Time complexity of the new algorithm is reduced to O(n³). In addition, the new algorithm is suitable for online applications without the decomposition of SE. Simulation shows that with the same parameters, the performance of the new algorithm is better than that of Yang's algorithm.
Źródło:
Journal of Applied Computer Science Methods; 2011, 3 No. 1; 5-16
1689-9636
Pojawia się w:
Journal of Applied Computer Science Methods
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The application of the arima model in forecasting the passenger traffic on the example of border crossings between the subcarpathian province and Ukraine
Autorzy:
Dejniak, D.
Powiązania:
https://bibliotekanauki.pl/articles/94741.pdf
Data publikacji:
2018
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
passenger border traffic
ARIMA models
time series analysis
Opis:
Accession of Poland to the European Union meant that its eastern border became the external frontier of the Community. The next step in the European integration was joining the Schengen Zone by Poland. Polish citizens may freely travel throughout the Schengen Zone and the state was obliged to tighten its eastern border. Under these circumstances conducting research on passenger traffic has become a vital issue, with particular focus on the eastern frontier. In the article an attempt is made at examining the possibility of forecasting passenger traffic on the example of border crossing points between the Subcarpathian Province and Ukraine using the ARIMA models. Confirmation of these possibilities seems to be crucial as the number of people crossing the border is characterized by high variability and sensitivity to the political situation. The study is based on the information provided by the Polish Border Guard. The conducted time series analysis is of a multi-purpose character. It may be used to support decision making processes of investment, organizational, as well as socio-political nature.
Źródło:
Information Systems in Management; 2018, 7, 3; 155-170
2084-5537
2544-1728
Pojawia się w:
Information Systems in Management
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of web platforms usage patterns with dynamic time series analysis methods
Autorzy:
Jankowski, Jarosław
Powiązania:
https://bibliotekanauki.pl/articles/453951.pdf
Data publikacji:
2011
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki
Tematy:
social platforms
time series analysis
web users’ behaviour
Opis:
The paper proposes a new approach to modelling online social systems users’ behaviours based on dynamic time wrap algorithm integrated with online system’s databases. The proposed method can be applied in the field of community platforms, virtual worlds and massively multiplayer online systems to capture quantitative characteristic of usage patterns.
Źródło:
Metody Ilościowe w Badaniach Ekonomicznych; 2011, 12, 1; 77-86
2082-792X
Pojawia się w:
Metody Ilościowe w Badaniach Ekonomicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A hybrid setarx model for spikes in tight electricity markets
Autorzy:
Lucheroni, C.
Powiązania:
https://bibliotekanauki.pl/articles/406389.pdf
Data publikacji:
2012
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
stochastic processes
time series analysis
power system economics
Opis:
The paper discusses a simple looking but highly nonlinear regime-switching, self-excited threshold model for hourly electricity prices in continuous and discrete time. The regime structure of the model is linked to organizational features of the market. In continuous time, the model can include spikes without using jumps, by defining stochastic orbits. In passing from continuous time to discrete time, the stochastic orbits survive discretization and can be identified again as spikes. A calibration technique suitable for the discrete version of this model, which does not need deseasonalization or spike filtering, is developed, tested and applied to market data. The discussion of the properties of the model uses phase-space analysis, an approach uncommon in econometrics.
Źródło:
Operations Research and Decisions; 2012, 22, 1; 13-49
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computational intensive methods for prediction and imputation in time series analysis
Autorzy:
Neves, Maria
Cordeiro, Clara
Powiązania:
https://bibliotekanauki.pl/articles/729950.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
bootstrap
forecast intervals
missing data
time series analysis
Opis:
One of the main goals in times series analysis is to forecast future values. Many forecasting methods have been developed and the most successful are based on the concept of exponential smoothing, based on the principle of obtaining forecasts as weighted combinations of past observations. Classical procedures to obtain forecast intervals assume a known distribution for the error process, what is not true in many situations. A bootstrap methodology can be used to compute distribution free forecast intervals. First an adequately chosen model is fitted to the data series. Afterwards, and inspired on sieve bootstrap, an AR(p) is used to filter the series of the random component, under the stationarity hypothesis. The centered residuals are then resampled and the initial series is reconstructed. This methodology will be used to obtain forecasting intervals and for treating missing data, which often appear in a real time series. An automatic procedure was developed in R language and will be applied in simulation studies as well as in real examples.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2011, 31, 1-2; 121-139
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Joint time-frequency and wavelet analysis - an introduction
Autorzy:
Majkowski, A.
Kołodziej, M.
Rak, R. J.
Powiązania:
https://bibliotekanauki.pl/articles/220841.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
frequency analysis
time-frequency analysis
short-time Fourier transform
Gabor transform
Wigner-Ville transform
Cone-Shaped Transform
wavelet analysis
time-scale analysis
wavelet decomposition
filter banks
wavelet packets
Opis:
A traditional frequency analysis is not appropriate for observation of properties of non-stationary signals. This stems from the fact that the time resolution is not defined in the Fourier spectrum. Thus, there is a need for methods implementing joint time-frequency analysis (t/f) algorithms. Practical aspects of some representative methods of time-frequency analysis, including Short Time Fourier Transform, Gabor Transform, Wigner-Ville Transform and Cone-Shaped Transform are described in this paper. Unfortunately, there is no correlation between the width of the time-frequency window and its frequency content in the t/f analysis. This property is not valid in the case of a wavelet transform. A wavelet is a wave-like oscillation, which forms its own “wavelet window”. Compression of the wavelet narrows the window, and vice versa. Individual wavelet functions are well localized in time and simultaneously in scale (the equivalent of frequency). The wavelet analysis owes its effectiveness to the pyramid algorithm described by Mallat, which enables fast decomposition of a signal into wavelet components.
Źródło:
Metrology and Measurement Systems; 2014, 21, 4; 741-758
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Infrared devices and techniques (revision)
Autorzy:
Rogalski, A.
Chrzanowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/221154.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
frequency analysis
time-frequency analysis
short-time Fourier transform
Gabor transform
Wigner-Ville transform
Cone-Shaped Transform
wavelet analysis
time-scale analysis
wavelet decomposition
filter banks
wavelet packets
Opis:
The main objective of this paper is to produce an applications-oriented review covering infrared techniques and devices. At the beginning infrared systems fundamentals are presented with emphasis on thermal emission, scene radiation and contrast, cooling techniques, and optics. Special attention is focused on night vision and thermal imaging concepts. Next section concentrates shortly on selected infrared systems and is arranged in order to increase complexity; from image intensifier systems, thermal imaging systems, to space-based systems. In this section are also described active and passive smart weapon seekers. Finally, other important infrared techniques and devices are shortly described, among them being: non-contact thermometers, radiometers, LIDAR, and infrared gas sensors.
Źródło:
Metrology and Measurement Systems; 2014, 21, 4; 565-618
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 282

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