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Wyświetlanie 1-15 z 39
Tytuł:
Computer aided order sequencing in a mixed - model assembly system
Komputerowo wspomagane sekwencjonowanie zleceń w systemie produkcji mixed-model
Autorzy:
Zemczak, M.
Kalinowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/339695.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Zarządzania Produkcją
Tematy:
CSP
sekwencjonowanie
systemy produkcji mixed-model
mixed-model assembly
sequencing
Opis:
In the paper issues related to the mixed-model production in linear systems on the example of a car manufacturing company are discussed. The origins of linear assembly systems are described, and problems concerning determining the sequence of tasks to be admitted to assembly processes are pointed out. The computer system for projecting the production orders sequence in a mixed-model production system, based on a hybrid solution is presented. Also basics of the CSP (car sequencing problem) are discussed.
W artykule omówione zostały zagadnienia związanie z produkcją w systemach mixed-model na przykładzie przedsiębiorstwa wytwarzającego samochody. Przedstawiona została geneza liniowych systemów montażowych oraz problemy związane z ustalaniem sekwencji zleceń przyjmowanych do montażu. Zaprezentowana została również aplikacja komputerowa do projektowania sekwencji zleceń w systemach mixed-model, oparta o rozwiązanie hybrydowe. Omówione zostały również podstawowe założenia problemu CSP (ang. Car Sequencing Problem, Problem Sekwencjonowania Samochodów).
Źródło:
Zarządzanie Przedsiębiorstwem; 2014, 17, 2; 42-48
1643-4773
Pojawia się w:
Zarządzanie Przedsiębiorstwem
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Formulation of a sequencing problem in a mixed-model production system
Autorzy:
Krenczyk, D.
Zemczak, M.
Powiązania:
https://bibliotekanauki.pl/articles/100016.pdf
Data publikacji:
2012
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
sequencing
simulation
mixed-model production system
Opis:
In the paper the problem of production orders sequencing in a mixed-model production system is considered. The authors present the design of the system and production orders, manufactured in the system. Model of the system consists of an input buffer and an assembly line with a given number of stations. The system is presented in a simplified manner, which provides the ability to compare it (under certain assumptions) with a real system. A virtual model of the mixed-model production system has been created. The main objective is to verify the correct operation of the prepared simulation model and the possibility of generating of input data and acquisition of output data in a mixed-model production system. The question is whether such model can be used to simulate the operation of a mixed-model production system in a manner that represents the outcome of a real system.
Źródło:
Journal of Machine Engineering; 2012, 12, 3; 45-51
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A note on the existence of the maximum likelihood estimate in variance components models
Autorzy:
Grządziel, Mariusz
Michalski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/729792.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
variance component
linear mixed model
maximum likelihood
Opis:
In the paper, the problem of the existence of the maximum likelihood estimate and the REML estimate in the variance components model is considered. Errors in the proof of Theorem 3.1 in the article of Demidenko and Massam (Sankhyā 61, 1999), giving a necessary and sufficient condition for the existence of the maximum likelihood estimate in this model, are pointed out and corrected. A new proof of Theorem 3.4 in the Demidenko and Massam's article, concerning the existence of the REML estimate of variance components, is presented.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2014, 34, 1-2; 159-167
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On maximum likelihood estimation in mixed normal models with two variance components
Autorzy:
Grządziel, Mariusz
Powiązania:
https://bibliotekanauki.pl/articles/729796.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
variance component
linear mixed model
maximum likelihood
Opis:
In the paper we deal with the problem of parameter estimation in the linear normal mixed model with two variance components. We present solutions to the problem of finding the global maximizer of the likelihood function and to the problem of finding the global maximizer of the REML likelihood function in this model.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2014, 34, 1-2; 187-197
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Minimizing length in a mixed model two sided assembly line using exact search method
Autorzy:
Yadav, Ashish
Verma, Pawan
Agrawal, Sunil
Powiązania:
https://bibliotekanauki.pl/articles/406705.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
two-sided assembly line balancing
mixed model
mathematical model
lingo-17 solver
Opis:
In the two-sided mixed-model assembly line, there is a process of installing two single stations in each position left and right of the assembly line with the combining of the product model. The main aim of this paper is to develop a new mathematical model for the mixed model two-sided assembly line balancing (MTALB) generally occurs in plants producing large-sized high-volume products such as buses or trucks. According to the literature review, authors focus on research gap that indicate in MTALB problem, minimize the length of the line play crucial role in industry space optimization.In this paper, the proposed mathematical model is applied to solve benchmark problems of two-sided mixed-model assembly line balancing problem to maximize the workload on each workstation which tends to increase the compactness in the beginning workstations which also helps to minimize the length of the line. Since the problem is well known as np-hard problem benchmark problem is solved using a branch and bound algorithm on lingo 17.0 solver and based on the computational results, station line effectiveness and efficiency that is obtained by reducing the length of the line in mated stations of the assembly line is increased.
Źródło:
Management and Production Engineering Review; 2019, 10, 4; 72-80
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Small Area Estimation Under a Mixture Model
Autorzy:
Chandra, Hukum
Bathla, HVL
Sud, U.C.
Powiązania:
https://bibliotekanauki.pl/articles/465788.pdf
Data publikacji:
2010
Wydawca:
Główny Urząd Statystyczny
Tematy:
Linear mixed model
Small area estimation
EBLUP
Zero-inflated data
mixture model
Opis:
Small area estimation (SAE) under a linear mixed model may not be efficient if data contain substantial proportion of zeros than would be expected under standard model assumptions (hereafter zero-inflated data). We discuss the SAE for zero-inflated data under a mixture model (Fletcher et al., 2005 and Karlberg, 2000) that account for excess zeros in the data. Our results from simulation studies show that mixture model based approach for SAE works well and produces an efficient set of small area estimates. An application to real survey data from the National Sample Survey Organisation of India demonstrates the satisfactory performance of the approach.
Źródło:
Statistics in Transition new series; 2010, 11, 3; 76-89
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On some calibration estimators of subpopulation total for longitudinal data
Autorzy:
Żądło, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/657601.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
longitudinal data
general linear mixed model
empirical best linear unbiased predictor
calibration estimators
Opis:
The problem of modeling longitudinal profiles is considered assuming that the population and elements affiliation to subpopulation may change in time. The considerations are based on a model with auxiliary variables for longitudinal data with subject specific (in this case - element and subpopulation specific) random components (compare Verbeke, Molenberghs, 2000; Hedeker, Gibbons, 2006) which is a special case of the General Linear Mixed Model. In the paper calibration estimators of subpopulation total for data from one period are presented and some modifications for the case of longitudinal data are proposed. Design-based mean squared errors and its estimators are also presented. In the simulation study accuracy of the estimators is compared with Horvitz-Thomson estimator and the best empirical linear unbiased predictor derived for the considered model.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2011, 252
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Small area quantile estimation based on distribution function using linear mixed models
Autorzy:
Stachurski, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/1837916.pdf
Data publikacji:
2021-06-30
Wydawca:
Uniwersytet Ekonomiczny w Poznaniu
Tematy:
quantile
distribution function
small area estimation
survey sampling
linear mixed model
Monte Carlo simulation
Opis:
In economic studies researchers are oeftn interested in the estimation of the distribution function or certain functions of the distribution function such as quantiles. This work focuses on the estimation quantiles as inverses of the estimates of the distribution function in the presence of auxiliary information that is correlated with the study variable. In the paper a plug-in estimator of the distribution function is proposed which is used to obtain quantiles in the population and in the small areas. Performance of the proposed method is compared with other estimators of the distribution function and quantiles using the simulation study. The obtained results show that the proposed method usually has smaller relative biases and relative RMSE comparing to other methods of obtaining quantiles based on inverting the distribution function.
Źródło:
Economics and Business Review; 2021, 7, 2; 97-114
2392-1641
Pojawia się w:
Economics and Business Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Percentile-Adjusted Estimation of Poverty Indicators for Domains Under Outlier Contamination
Autorzy:
Veijanen, Ari
Lehtonen, Risto
Powiązania:
https://bibliotekanauki.pl/articles/466042.pdf
Data publikacji:
2011
Wydawca:
Główny Urząd Statystyczny
Tematy:
small area estimation
poverty indicator
income data
bias correction
auxiliary information
mixed model
prediction
Opis:
Traditional estimation of poverty and inequality indicators, such as the Gini coefficient, for regions does not currently use auxiliary information or models fitted to income survey data. A predictor-type estimator constructed from ordinary mixed model predictions is not necessarily useful, as the predictions have too small spread for estimation of income statistics. Ordinary bias corrections are aimed at correcting the expectation of predictions, but poverty indicators would not be affected at all by a correction involving multiplication of predictions. We need a method improving the shape of the distribution of predictions, as poverty indicators describe differences of income between people. We therefore introduce a transformation bringing the percentiles of transformed predictions closer to the percentiles of sample values. The experiments show that the transformation results in smaller MSE of a predictor. If unit-level data from population are not available, the marginal domain frequencies of qualitative auxiliary variables can be successfully incorporated into a new calibration-based predictor-type estimator. The results are based on design-based simulation experiments where we use a population generated from an EU-wide income survey. The study is a part of the AMELI project funded by the European Union under the Seventh Framework Programme for research and technological development (FP7).
Źródło:
Statistics in Transition new series; 2011, 12, 2; 345-356
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
COMPOSITION OF EQUITY AND MIXED PENSION FUNDS IN SLOVAKIA
Autorzy:
Papík, Mário
Powiązania:
https://bibliotekanauki.pl/articles/488974.pdf
Data publikacji:
2017
Wydawca:
Instytut Badań Gospodarczych
Tematy:
pension funds
equity funds
assets allocation
mixed effect model
Opis:
Research background: Since January 2013, pension fund management companies have had to establish at least two pension funds, one guaranteed bond fund, and at least one unguaranteed equity fund. This division has brought many changes in portfolios of pension funds in Slovakia. Currently, six pension funds management companies manage six bonds, six equity, five indexed and three mixed funds. Purpose of the article: The aim of this article is to monitor the composition of assets during 2009 and 2014 and describe relation between equity and mixed pension funds’ profit and components of assets they own. The results of this research contribute to a better understanding of the importance of certain types of financial assets owned by equity and mixed funds and their impact on pension funds’ profit. Last, but not least, this article helps to improve the legislative management of pension funds and their impact on macroeconomic situation in Slovakia, because pension funds are still concentrating higher and higher amount of financial assets from government bonds to companies’ stocks. Methods: This relation will be described by linear mixed-effects model with random effects of years and pension funds management companies. Random effects also help to identify the impact of changes during the period studied, and in case that profit is significantly different across the pension funds management companies. Findings & Value added: The underlying model data will be chosen from annual balance sheets, income statements and notes of Slovakia-based equity and mixed funds during the period studied.
Źródło:
Oeconomia Copernicana; 2017, 8, 1; 51-64
2083-1277
Pojawia się w:
Oeconomia Copernicana
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Compensatory Collective Redress: Will It Be Part of Private Enforcement of Competition Law in CEE Countries?
Autorzy:
Piszcz, Anna
Powiązania:
https://bibliotekanauki.pl/articles/529959.pdf
Data publikacji:
2017-06-30
Wydawca:
Uniwersytet Warszawski. Wydawnictwo Naukowe Wydziału Zarządzania
Tematy:
compensatory collective redress
private enforcement
competition law
opt-in model
opt-out model
mixed model
group actions
representative actions
Opis:
The article aims to compare and evaluate solutions with regard to compensatory collective redress existing in CEE countries. The author will attempt to illuminate obstacles and challenges to using collective redress as an avenue for antitrust enforcement in CEE countries, as well as possible advantages of the scrutinised legal frameworks. Besides focusing on national provisions, the article will draw on provisions of the Damages Directive and the Commission's Recommendation on collective redress mechanisms. It will open up the field for de lege ferenda proposals also.
Źródło:
Yearbook of Antitrust and Regulatory Studies; 2017, 10(15); 223-250
1689-9024
2545-0115
Pojawia się w:
Yearbook of Antitrust and Regulatory Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of EU enlargement on the agricultural output and income in the member states
Autorzy:
Kobus, P.
Powiązania:
https://bibliotekanauki.pl/articles/573081.pdf
Data publikacji:
2008
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
European Union
enlargement
agriculture
income
Member State
agricultural output
mixed linear model
statistical model
Opis:
The paper presents an analysis of the impact of the EU enlargement in 2004 on the agricultural output and incomes of the EU Member States. The main aim of the study is to test the significance of difference of reaction to enlargement in three distinct groups of members, namely the ‘old’ fifteen Member States, the ‘new’ ten Member States which accessed the EU on May 1st 2004, and the two ‘newest’ Member States, i.e. Romania and Bulgaria which accessed the EU on January 1st 2007. For the purpose of description of different countries behaviour a linear mixed model was applied.
Źródło:
Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego; 2008, 03(18)
2081-6960
Pojawia się w:
Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On accuracy of some EBLU predictor
O dokładności pewnego predyktora typu EBLU
Autorzy:
Żądło, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/907019.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
small area estimation
empirical best linear unbiased predictors
general mixed linear model
Opis:
In the paper we analyze the accuracy of the empirical best linear unbiased predictor (EBLUP) of the domain total (see Royall, 1976) assuming a special case of the general linear mixed model. To estimate the mean square error (MSE) of the EBLUP we use the results obtained by Datta and Lahiri (2000) for the predictor proposed by Henderson (1950) and adopt them for the predictor proposed by Royall (1976). In a simulation study we study real data on Polish farms from Dąbrowa Tarnowska region.
W opracowaniu analizujemy dokładność empirycznych najlepszych liniowych nieobciążonych predyktorów wartości globalnej w domenie (ang. EBLUP - empirical best linear unbiased predictor) zakładając model nadpopulacji należący do klasy ogólnych mieszanych modeli liniowych. Do oceny błędu średniokwadratowego (ang. MSE - mean square error) predyktora typu EBLU wykorzystano rezultaty prezentowane przez Datta and Lahiri (2000) dla predyktora zaproponowanego przez Hendersona (1950) po zaadoptowaniu ich dla przypadku predyktora zaproponowanego przez Royalla (1976). W badaniu symulacyjnym wykorzystano rzeczywiste dane dotyczące gospodarstw rolnych w powiecie Dąbrowa Tarnowska uzyskane w spisie rolnym w 1996.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2008, 216
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigating snowplow-related injury severity along mountainous roadway in Wyoming
Autorzy:
Haq, Muhammad Tahmidul
Reza, Imran
Ksaibati, Khaled
Powiązania:
https://bibliotekanauki.pl/articles/2204253.pdf
Data publikacji:
2023
Wydawca:
Fundacja Centrum Badań Socjologicznych
Tematy:
winter highway maintenance
snowplows
injury severity
mixed logit model
unobserved heterogeneity
Wyoming
environment
Opis:
Snow removal and deicing using snowplow trucks assist transportation agencies to enhance roadway safety and mobility. However, due to slower travel speeds during these operations, motorists often end up in crashes for poor visibility and disturbance of the snow. Despite the risk associated with snowplows, no previous study was found that exclusively investigate the factors associated with injury severity in snowplow-involved crashes. Therefore, this paper presents an extensive exploratory analysis and fills this knowledge gap by identifying the significant contributing factors affecting the occupant injury severity from the aspects of crashes with snowplow involvement. The study utilized eleven years (2010-2020) of historical snowplow-related crash data from Wyoming. Both the binary logit model and mixed binary logit model were developed to investigate the impacts of the various occupant, vehicle, crash, roadway, and environmental characteristics on the corresponding occupant injury severity. As one of the important findings from this research concludes that other vehicle drivers are more responsible than snowplow drivers contributing to more severe injuries in crashes involving snowplows. Recommendations suggested based on the modeling results are expected to help transportation agencies and policymakers take necessary actions in reducing snowplow-involved crashes by targeting appropriate strategies and proper resource allocation.
Źródło:
Journal of Sustainable Development of Transport and Logistics; 2023, 8, 1; 73--88
2520-2979
Pojawia się w:
Journal of Sustainable Development of Transport and Logistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Supplier Selection for Mixed-Model Production: A Case Study from the Apparel Industry
Selekcja dostawców dla produkcji wielowersyjnej: Analiza przemysłu odzieżowego
Autorzy:
Stojanov, T
Ding, X
Powiązania:
https://bibliotekanauki.pl/articles/234495.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
apparel
mixed-model production
analytical hierarchy process
cluster analysis
supplier selection
system zindywidualizowanej produkcji masowej
selekcja dostawców
analiza kosztów
analiza klasterów
Opis:
The mass-customization trend as flexible production philosophy has been adopted by many industries as a reaction to the fast changing customer demand environment. In relation to that mixed-model production (MMP) is a possibility for increasing flexibility, especially in the assembly department. However, many apparel companies have failed in their transition from traditional manufacturing to new, flexible manufacturing, which makes it difficult for them to be selected as suppliers who are capable of MMP. In most of the studies that have been done before, the problem of supplier selection was based on productivity and cost as the main selection criteria. As an alternative solution this research presents a new group of criteria for supplier selection with respect to the goal of MMP. The methodology of combining the analytical hierarchy process (AHP) with the support of the commercial software package Expert Choice and cluster analysis (CA) is proposed in this study. The results obtained present a new group of criteria, ranked by their importance, that the supplier needs to fulfil in order to be selected for MMP. Furthermore the large number of available suppliers was grouped into four clusters based on their similar characteristics by using CA. Finally the most acceptable cluster for MMP was selected using AHP. The methodology presented in this study can support the apparel industry in better decision making in the process of selecting the best group of suppliers for mixed-model production.
W wielu przemysłach wprowadzono system zindywidualizowanej produkcji masowej jako reakcję na szybko zmieniające się wymagania konsumentów. Dotychczas selekcja dostawców oparta była na produktywności i analizie kosztów. Ten artykuł prezentuje alternatywne rozwiązanie z wyborem nowej grupy kryteriów. Przedstawiono metodologię połączenia metody hierarchicznej analizy z pakietem Expert Choice i analizą klastrów. W proponowanej metodzie dostawcy zostali podzieleni na cztery klastry na podstawie podobieństwa charakterystyk. W efekcie najbardziej akceptowalny klaster zostaje wybrany przy zastosowaniu metody hierarchicznej analizy. Metoda ta może wspomóc prawidłowe funkcjonowanie przemysłu odzieżowego.
Źródło:
Fibres & Textiles in Eastern Europe; 2015, 1 (109); 8-12
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 39

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