Temat: fuzzy time - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: The Forecasting of Labour Force Participation and the Unemployment Rate in Poland and Turkey Using Fuzzy Time Series Methods
Autorzy:: Yolcu, Ufuk
Bas, Eren
Tematy:: fuzzy time series
forecasting
labour force participation
unemployment; Pokaż więcej
Wydawca:: Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Powiązania:: https://bibliotekanauki.pl/articles/633062.pdf Link otwiera się w nowym oknie
Opis:: Fuzzy time series methods based on the fuzzy set theory proposed by Zadeh (1965) was first introduced by Song and Chissom (1993). Since fuzzy time series methods do not have the assumptions that traditional time series do and have effective forecasting performance, the interest on fuzzy time series approaches is increasing rapidly. Fuzzy time series methods have been used in almost all areas, such as environmental science, economy and finance. The concepts of labour force participation and unemployment have great importance in terms of both the economy and sociology of countries. For this reason there are many studies on their forecasting. In this study, we aim to forecast the labour force participation and unemployment rate in Poland and Turkey using different fuzzy time series methods.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Modelling imperfect time intervals in a two-dimensional space
Autorzy:: Qiang, Y.
Delafontaine, M.
Asmussen, K.
Stichelbaut, B.
De Tre, G.
De Maeyer, P.
Van de Weghe, N.
Tematy:: rough set
rough time interval
fuzzy set
fuzzy time interval
Triangular Model
temporal relation; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Badań Systemowych PAN
Powiązania:: https://bibliotekanauki.pl/articles/970193.pdf Link otwiera się w nowym oknie
Opis:: Every event has an extent in time, which is usually described by crisp time intervals. However, under some circumstances, temporal extents of events are imperfect, and therefore cannot be adequately modelled by crisp time intervals. Rough sets and fuzzy sets are two frequently used tools for representing imperfect temporal information. In this paper, we apply a two-dimensional representation of crisp time intervals, which is called the Triangular Model (TM), to investigate rough time intervals (RTIs) and fuzzy time intervals (FTIs). With this model, RTIs and FTIs, as well as their temporal relations, can be represented as graphics (i.e. discrete geometries or continuous fields) in a two-dimensional time space. Compared to the traditional linear representation of time intervals, we found that TM provides a more compact and clearer representation of imperfect time intervals and relations. Moreover, temporal queries of imperfect intervals can be graphically addressed in TM, which is closer to human intuition than mathematical expressions. As human minds are more efficient in perceiving and processing graphic representations than numerical representations, we believe TM can be applied as a valuable assistant tool for analysing and reasoning about imperfect time intervals.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Short-term load prediction model combining FEW and IHS algorithm
Autorzy:: Yu, Mingxing
Zhu, Jiazheng
Yang, Li
Tematy:: evaluation criteria
exponential fuzzy time series
fitness function
improved harmony search algorithms
load forecasting
optimal interval length; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/141740.pdf Link otwiera się w nowym oknie
Opis:: :Accurate prediction of power load plays a crucial role in the power industry and provides economic operation decisions for the power operation department. Due to the unpredictability and periodicity of power load, an improved method to deal with complex nonlinear relation was adopted, and a short-term load forecasting model combining FEW (fuzzy exponential weighting) and IHS (improved harmonic search) algorithms was proposed. Firstly, the domain space was defined, the harmony memory base was initialized, and the fuzzy logic relation was identified. Then the optimal interval length was calculated using the training sample data, and local and global optimum were updated by optimization criteria and judging criteria. Finally, the optimized parameters obtained by an IHS algorithm were applied to the FEW model and the load data of the Huludao region (2013) in Northeast China in May. The accuracy of the proposed model was verified using an evaluation criterion as the fitness function. The results of error analysis show that the model can effectively predict short-term power load data and has high stability and accuracy, which provides a reference for application of short-term prediction in other industrial fields.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Inventory model for deteriorating items with negative exponential demand, probabilistic deterioration and fuzzy lead time under partial back logging
Autorzy:: Sen, Nabendu
Saha, Sumit
Tematy:: fuzzy lead time
shortages
partially backlogged
exponentially declining demand
probabilistic deterioration; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/1181963.pdf Link otwiera się w nowym oknie
Opis:: The effect of lead time plays an important role in inventory management. It is also important to study the optimal strategies when the lead time is not precisely known to the decision-makers. This paper aimed to examine the inventory model for deteriorating items with fuzzy lead time, negative exponential demand, and partially backlogged shortages. This model is unique in its nature due to probabilistic deterioration along with fuzzy lead time. The fuzzy lead time was assumed to be triangular, parabolic, trapezoidal numbers. The graded mean integration representation method was used for the defuzzification purpose. Three different types of probability distributions, namely uniform, triangular and beta were used for rate of deterioration to find optimal time and associated total inventory cost. The developed model was validated numerically, and values of optimal time and total inventory cost are given in a tabular form, corresponding to different probability distributions and fuzzy lead-time. The sensitivity analysis was performed on the variation of key parameters to observe its effect on the developed model.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Harmonogramowanie robót budowlanych z zastosowaniem algorytmu Tabu Search z rozmytymi czasami wykonania zadań
Scheduling of construction works using a tabu search algorithm with fuzzy task completion times
Autorzy:: Rogalska, M.
Bożejko, W.
Hejducki, Z.
Wodecki, M.
Tematy:: inwestycja budowlana
proces budowlany
harmonogram robót
niepewność
czas wykonania zadań
czas rozmyty
algorytm tabu search
construction project
construction process
schedule of works
uncertainty
task execution time
fuzzy time
tabu search algorithm; Pokaż więcej
Wydawca:: Polski Związek Inżynierów i Techników Budownictwa
Powiązania:: https://bibliotekanauki.pl/articles/161714.pdf Link otwiera się w nowym oknie
Opis:: Praca ta stanowi kontynuację studiów różnych autorów nad zagadnieniami związanymi z uwzględnieniem niepewności w harmonogramowaniu robót budowlanych. Jednym ze sposobów reprezentowania niepewności jest zastosowanie elementów teorii zbiorów rozmytych, umożliwiających oszacowanie czasów wykonania prac oraz cyklu realizacji kompleksu robót.
This paper continues the authors' work on issues relating to taking account of uncertainties in the scheduling of construction works. One way of representing uncertainty is to use elements of the theory of fuzzy sets, which make it possible to estimate work completion times and the execution cycle for a comprehensive series of works.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Fuzzy system reliability analysis using dependent fuzzy set
Autorzy:: Aliev, I. M.
Kara, Z.
Tematy:: niezawodność rozmyta
tempo uszkodzenia rozmytego
zbiór rozmyty zależny czasowo
fuzzy reliability
fuzzy failure rate
time dependent fuzzy set; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Badań Systemowych PAN
Powiązania:: https://bibliotekanauki.pl/articles/970453.pdf Link otwiera się w nowym oknie
Opis:: In this paper the use of the concept, of [gamma]-cut (interval of confidence) and time dependent fuzzy set, theory is proposed in a general procedure to construct the membership function of the fuzzy reliability, when the failure rate is fuzzy. The failure rate of the system is represented by a triangular fuzzy number. A simple numerical example is also presented.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Observer-based fault-tolerant control against sensor failures for fuzzy systems with time delays
Autorzy:: Tong, S.
Yang, G.
Zhang, W.
Tematy:: sterowanie rozmyte
sterowanie z opóźnieniem
obserwator stanu
sterowanie tolerujące uszkodzenia
liniowa nierówność macierzowa
analiza stateczności
fuzzy time delay systems
sensor faults
state observer
fault tolerant control
linear matrix inequalities
stability analysis; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Powiązania:: https://bibliotekanauki.pl/articles/930168.pdf Link otwiera się w nowym oknie
Opis:: This paper addresses the problems of robust fault estimation and fault-tolerant control for Takagi-Sugeno (T-S) fuzzy systems with time delays and unknown sensor faults. A fuzzy augmented state and fault observer is designed to achieve the system state and sensor fault estimates simultaneously. Furthermore, based on the information of on-line fault estimates, an observer-based dynamic output feedback fault-tolerant controller is developed to compensate for the effect of faults by stabilizing the resulting closed-loop system. Sufficient conditions for the existence of both a state observer and a fault-tolerant controller are given in terms of linear matrix inequalities. A simulation example is given to illustrate the effectiveness of the proposed approach.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Travel Time Forecasting Based on Fuzzy Patterns
Autorzy:: Kiersztyn, Adam
Gandzel, Agnieszka Gandzel
Koczan, Leopold
Celiński, Maciej
Tematy:: fuzzy clustering
travel time forecasting
fuzzy patterns
transportation data; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/2023310.pdf Link otwiera się w nowym oknie
Opis:: Estimating travel time is one of the most important processes in logistics as well as in everyday life. In particular, when it comes to transportation services, efficient time management can be a competitive advantage, not to mention customer satisfaction, which can be easily translated into business success. Therefore, in this study we analyze various travel time estimation methods in combination with a well-known Fuzzy C-Means clustering algorithm. The proposed FCM-based solution has significant advantages, allowing for the determination of the optimal travel time. In an extensive numerical experiment, we present the application of the proposed method to estimate the time of a taxi trip around New York. Due to division of the city area into detailed areas and taking into account information about the travel time in the analysis, a model was obtained, that perfectly forecasts speed of taxi travel. In this study we consider various, competitive approaches to build such a model.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Dynamic fuzzy model for detecting verbal violence in real time
Autorzy:: Campos, Obed
Pancardo, Pablo
Hernandez-Nolasco, Jose Adan
Tematy:: fuzzy logic
dynamic
verbal violence
real time; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:: https://bibliotekanauki.pl/articles/27312892.pdf Link otwiera się w nowym oknie
Opis:: The crime rates in Mexico have been increasing in recent years; every day, there are reports on social media and in the news where assaults and verbal aggression by criminals can be seen. Public transportation units suffer from violence that authorities have not been able to reduce despite their efforts. This is why we have developed a fuzzy logic model that can adapt to almost any scenario thanks to the dynamism that we have implemented in each of its stages. We have obtained promising results that we believe will be of great help to the authorities for detecting the exact moment in which verbal aggression that is typical of a violent assault is happening in real time. This is a tool to help the authorities, not a substitution; we are simply making use of the latest technologies that are available to us. The goal of this paper is to provide a novel method for Mexican authorities in Mexico City in order to help the actual surveillance systems make faster decisions about whether violent assaults are happening or not.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Kendall control chart for fuzzy data
Raport Badawczy = Research Report ; RB/23/2007
Autorzy:: Olwert, Anna
Hryniewicz, Olgierd (1948– )
Wydawca:: Instytut Badań Systemowych. Polska Akademia Nauk
Systems Research Institute. Polish Academy of Sciences
Powiązania:: Raport Badawczy = Research Report
Opis:: 13 pages ; 21 cm
Bibliografia s. 13
Bibliography p. 13
13 stron ; 21 cm
The paper deals with the well-known set packing problem. It is assumed that some of the problem coefficients are realizations of mutually independent random variables. Average case properties of selected problem characteristics are investigated for the variety of possible instances of the problem.
Dostawca treści:: RCIN - Repozytorium Cyfrowe Instytutów Naukowych

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