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Wyświetlanie 1-15 z 42
Tytuł:
Demand driven material requirements planning. Some methodical and practical comments
Autorzy:
Pekarčíková, Miriam
Trebuňa, Peter
Kliment, Marek
Trojan, Jozef
Powiązania:
https://bibliotekanauki.pl/articles/406796.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
demand
supply chain
DDMRP
buffer
inventory
Opis:
Industry 4.0 will affect the complexity of supply chain networks. It will be necessary to adapt more and more to the customer and respond within a time interval that is willing to accept the product waiting. From these considerations, there is a need for a different way of managing the supply chain. The traditional concept of supply chain as a linear system, which allows optimizing individual subsystems, thus obtaining an optimized supply chain, is not enough. The article deals with the issue of supply chain management reflecting demand behaviour using the methodology Demand Driven MRP system. The aim of the publication is to extend the knowledge base in the area of demand-driven supply logistics in the context of Industry 4.0 and verify the processed theoretical knowledge in a case study.
Źródło:
Management and Production Engineering Review; 2019, 10, 2; 50--59
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of stochastic lead times on the bullwhip effect – an empirical insight
Autorzy:
Nielsen, P.
Michna, Z.
Powiązania:
https://bibliotekanauki.pl/articles/407121.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
supply chain
bullwhip effect
inventory policy
lead time demand
order-up-to-level policy
stochastic lead time
demand forecasting
lead time forecasting
lead time demand forecasting
Opis:
In this article, we review the research state of the bullwhip effect in supply chains with stochastic lead times. We analyze problems arising in a supply chain when lead times are not deterministic. Using real data from a supply chain, we confirm that lead times are stochastic and can be modeled by a sequence of independent identically distributed random variables. This underlines the need to further study supply chains with stochastic lead times and model the behavior of such chains.
Źródło:
Management and Production Engineering Review; 2018, 9, 1; 65-70
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ewolucja turystyki na obszarach wiejskich
Evolution of Tourism in Rural Areas
Autorzy:
Matczak, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/2027641.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Definition
demand
rural environment
rural tourism
supply.
Opis:
In this work the identification of the process of changes in rural tourism has been presented. The evolution of rural tourism is defined by changes occurring in the countryside and in tourism itself. The presented analysis of the evolution of rural tourism is based on a change in the approach to the definition of rural tourism, to the supply and demand, and to the influence of rural tourism on rural environment. The analysis is restricted by the available literature of the subject and by statistical data for Poland. In the beginning the rural tourism was considered as the tourism occurring in the countryside. Afterwards, many aspects of rural tourism were recognized, which is reflected by its definitions. The evolution of tourism supply also took place and, as a result, the tourism supply became more diverse. Apart from traditional forms of vacational tourism, some new forms requiring a specifically designed landscape, equipment, cultural events, managment etc. appeared. New clients looking for specific experiences in rural tourism also appeared. For such clients the countryside became a tourism product. They are also able to provide a sufficient income for the sustainable development of the countryside. Providing tourism services by farms often leads to the collapse of their agricultural activity, and, in consequence, to the dominating role of tourists’ service, which leads to the multifunctionality of the countryside. Such a hypothesis requires further empirical investigations. The literature of the subject indicates that the model of tourist area lifecycle (TALC), as proposed by Butler in 1980, is useful for carrying out analyses of rural tourism evolution.
Źródło:
Studia komitetu przestrzennego zagospodarowania kraju PAN; 2015, 162; 63-82
0079-3507
Pojawia się w:
Studia komitetu przestrzennego zagospodarowania kraju PAN
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Popyt na miasto jako inspiracja rozwoju regionu
Demand for the City as Regional Development Inspiration
Autorzy:
Czornik, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/2028792.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
City
demand for the city
regional development
Opis:
The paper presents some considerations about the market incentives for regional development. Its main objective is to identify the determinants of undertaking the implementation of good changes in larger areas, which are inspired by the demand for specifi c small place offers. This refers to regional conditions and needs, which are satisfi ed by urban areas. In central part of paper the list of factors was created, infl uenced on demand for the city products and over-local relations. The main thesis postulates the regional co-operation to summing the demands for products of different urban places, which can effect minimizing confl icts among cities in the region and generate more attractive regional offers. The case of that analytic approach is the comparison of Silesian cities inhabitants opinions with declarations about regional development strategic orientations in “Silesian Region Development Strategy ŚLĄSKIE 2020+”.
Źródło:
Studia komitetu przestrzennego zagospodarowania kraju PAN; 2015, 164; 318-329
0079-3507
Pojawia się w:
Studia komitetu przestrzennego zagospodarowania kraju PAN
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Demand and Income Effect of Internal Educational Migration in Academic Centres – the Case of Opole
Autorzy:
Rokita-Poskart, Diana
Powiązania:
https://bibliotekanauki.pl/articles/498577.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
educational migration
demand effect
income effect
the influx area
Opis:
In cities with large educational institutions, the inflow of educational migrants is important for consumption demand, and can trigger multiplier effects. The main aim of this article is to show the mechanism of the aggregate demand-income effect created by educational migration in the Polish city of Opole. An estimate of this effect is provided, based on questionnaire research among a sample of 1 075 students from all institutions of higher education located in the city. The estimated effects analysed concern the direct consumption impulse, as well as the indirect job creation and increase in income for providers of accommodation for students, in turn triggering increased consumption demand. While the results must be interpreted with care, an estimated 15 per cent of consumption demand created through expenditure of migrant students (about PLN 175 400 000) and 485 extra job show the significance of such expenditure for the local economy.
Źródło:
Central and Eastern European Migration Review; 2018, 7, 2; 197-208
2300-1682
Pojawia się w:
Central and Eastern European Migration Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Case study about economic order quantities and comparison of results from conventional EOQ model and response surface-based approach
Autorzy:
Yıldız, R.
Yaman, R.
Powiązania:
https://bibliotekanauki.pl/articles/406756.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
economic order quantity
Pareto analysis
response surface
demand forecasting
Opis:
This study involves the implementation of an economic order quantity (EOQ) model which is an inventory control method in a ceramic factory. Two different methods were applied for the calculation of EOQs. The first method is to determine EOQ values using a response surface method-based approach (RSM). The second method uses conventional EOQ calculations. To produce a ceramic product, 281 different and additive materials may be used. First, Pareto (ABC) analysis was performed to determine which of the materials have higher priority. Because of this analysis, the value of 21 items among 281 different materials and additives were compared to the ratio of the total product. The ratio was found to be 70.4% so calculations were made for 21 items. Usage value for every single item for the years 2011, 2012, 2013 and 2014, respectively, were obtained from the company records. Eight different demand forecasting methods were applied to find the amount of the demand in EOQ. As a result of forecasting, the EOQ of the items were calculated by establishing a model. Also, EOQ and RSM calculations for the items were made and both calculation results were compared to each other. Considering the obtained results, it is understood that RSM can be used in EOQ calculations rather than the conventional EOQ model. Also, there are big differences between the EOQ values which were implemented by the company and the values calculated. Because of this work, the RSM-based EOQ approach can be used to decide on the EOQ calculations as a way of improving the system performance.
Źródło:
Management and Production Engineering Review; 2018, 9, 3; 23-32
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deregulation of electricity market and drivers of demand for electrical energy in industry
Autorzy:
Bojnec, S.
Papler, D.
Powiązania:
https://bibliotekanauki.pl/articles/406681.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electricity prices
market deregulation
industrial users
demand function
Slovenia
Opis:
This paper investigates deregulation of electricity market focusing on electricity prices and drivers of demand for electrical energy in industry in Slovenia. The patterns in evolution of real electricity price developments and the three main components of the electricity price are calculated: liberalized market share for purchased electricity price, regulated infrastructure share for use of electricity network grids and mandatory state charges in the sale of electricity (duty, excise duty and value-added tax). To calculate the real value of electricity prices, producer price index of industrial commodities for electricity prices in industry is used as deflator and implicit deflator of gross domestic product for the size of the economy. In the empirical econometric part is used regression analysis for the amount electricity consumption in the industry depending on the real gross domestic product, direct and cross-price elasticity for natural gas prices in the industry. The results confirmed volatility in real electricity price developments with their increasing tendency and the increasing share of different taxes and state charges in the electricity prices for industry. Demand for electrical energy in industry is positively associated with gross domestic product and price of natural gas as substitute for electrical energy in industry use, and negatively associated with prices of electrical energy for industry.
Źródło:
Management and Production Engineering Review; 2016, 7, 3; 4-10
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adaptive inventory control system for material items with continuous non-stationary demand
Autorzy:
Krajčovič, M.
Plinta, D.
Powiązania:
https://bibliotekanauki.pl/articles/406736.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
inventory control
algorithm
non-stationary demand
joint replenishment
inventory analysis
Opis:
This paper describes an algorithm of dynamic inventory control system for large numbers of material items with continuous non-stationary demand. It uses principles of pull inventory control systems, statistical inventory analysis and joint replenishment inventory systems. This algorithm was processed in software module (VBA for Excel) and applied in practice. The target of described algorithm is to keep an optimum inventory level and optimum customer service level in terms of inventory control of items with non-stationary demand.
Źródło:
Management and Production Engineering Review; 2014, 5, 1; 11-20
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exponential smoothing for multi-product lot-sizing with heijunka and varying demand
Autorzy:
Korytkowski, P.
Grimaud, F.
Dolgui, A.
Powiązania:
https://bibliotekanauki.pl/articles/406946.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
job shop
multiproduct
varying demand
lot-sizing
heijunka
exponential smoothing
Opis:
Here we discuss a multi-product lot-sizing problem for a job shop controlled with a heijunka box. Demand is considered as a random variable with constant variation which must be absorbed somehow by the manufacturing system, either by increased inventory or by flexibility in the production. When a heijunka concept (production leveling) is used, fluctuations in customer orders are not transferred directly to the manufacturing system allowing for a smoother production and better production capacity utilization. The problem rather is to determine a tradeoff between the variability in the production line capacity requirement and the inventory level.
Źródło:
Management and Production Engineering Review; 2014, 5, 2; 20-26
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shop floor-level control of manufacturing companies: an interview study in Finland
Autorzy:
Tokola, H.
Järvenpää, E.
Salonen, T.
Lanz, M.
Koho, M.
Niemi, E.
Powiązania:
https://bibliotekanauki.pl/articles/407355.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
demand forecasting
shop floor control
production flexibility
inventory control
interview
Opis:
This paper publishes the results of interviews regarding shop-floor-level control of 18 Finnish manufacturing companies. The interviews had 17 open questions relating to demand characteristics, shop floor-level control issues, production flexibility, inventory control, and potential development areas. In order to get insights from the interviews, this paper analyses the answers from the interviews and categorises them into typical answers. The companies that were interviewed are also categorised as small companies with their own end products, subcontractors, or large companies with their own end products, and the emphasis of the analysis is on how companies differ in their shop floor-level control. The results show that different types of companies have different characteristics. Small companies are characterised by constant workflow, seasonal trends in demand, and the use of forecasts. Subcontractors have great daily variation in their demand and processing times. Large companies tend to focus on inventory issues.
Źródło:
Management and Production Engineering Review; 2015, 6, 1; 51-58
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Service configuration in SOA-based enterprise representation using role knowledge
Autorzy:
Sandkuhl, K.
Seigerroth, U.
Smirnov, A.
Levashova, T.
Shilov, N.
Powiązania:
https://bibliotekanauki.pl/articles/407397.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
enterprise model
role
information demand
service-oriented architecture
service configuration
Opis:
This work investigates the use of enterprise models for service configuration with a focus on knowledge related to organizational roles. Starting from an industrial case, it presents an approach to extract a role’s information demand from an enterprise model and to use this as initial configuration for agent-based services. In addition to the meta-model included in the enterprise modeling language, the use of a common ontology is proposed which captures both, the perspective of information demand and services. The architecture of the agentbased services is following the idea to characterize all actors by their roles and to represent them by sets of services. This approach facilitates self-organization in the service level. The main contributions of the paper are (1) to show that a role’s information demand is relevant for service configuration, (2) to present a way of extracting information demand from enterprise models, and (3) to extend an approach for SOA-based enterprise representation with information demand.
Źródło:
Management and Production Engineering Review; 2014, 5, 1; 51-64
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlation between air temperature and electricitydemand by linear regression and wavelet coherence approach: UK, Slovakia and Bosnia and Herzegovina case study
Autorzy:
Avdakovic, S
Ademovic, A.
Nuhanovic, A.
Powiązania:
https://bibliotekanauki.pl/articles/141710.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
power system
electricity demand
air temperature
linear regression
wavelet coherence
Opis:
In this paper, the results of correlations between air temperature and electricity demand by linear regression and Wavelet Coherence (WTC) approach for three different European countries are presented. The results show a very close relationship between air temperature and electricity demand for the selected power systems, however, the WTC approach presents interesting dynamics of correlations between air temperature and electricity demand at different time-frequency space and provide useful information for a more complete understanding of the related consumption.
Źródło:
Archives of Electrical Engineering; 2013, 62, 4; 521-532
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of the safety stock on the occurrence probability of the stock shortage
Autorzy:
Korponai, J.
Tóth, Á. B.
Illés, B.
Powiązania:
https://bibliotekanauki.pl/articles/406863.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
demand changes
safety stock
service level
shortage
stochastic
supply accuracy
Opis:
The objective of the logistics management is to guarantee the stock level required for the adequate handling of production at the lowest possible level of costs and risks. The main purpose of the paper is to present the relations between stock level and risk of shortages. As a result of the research, the introduction of the safety stock is the solution to cover the effects of the uncertain factors in the supply chain. The theoretical approach of the model assumes a deterministic operational environment, in practice, however, there are several unpredictable factors influencing the operation of the production company. By using the periodic and continuous review models, the paper presents the effects of demand changes and stochastic length of replenishment time on the risk of stock availability. We need to quantify a service level which determines the accepted probability of the shortage occurrence.
Źródło:
Management and Production Engineering Review; 2017, 8, 1; 69-77
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Global tungsten demand and supply forecast
Światowe prognozy popytu i podaży wolframu
Autorzy:
Dvoracek, J.
Sousedikova, R.
Vratny, T.
Jurekova, Z.
Powiązania:
https://bibliotekanauki.pl/articles/218757.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
popyt na wolfram
podaż wolframu
oszacowanie
tungsten supply
tungsten demand
estimate
Opis:
An estimate of the world tungsten demand and supply until 2018 has been made. The figures were obtained by extrapolating from past trends of tungsten production from1905, and its demand from 1964. In addition, estimate suggestions of major production and investment companies were taken into account with regard to implementations of new projects for mining of tungsten or possible termination of its standing extraction. It can be assumed that tungsten supply will match demand by 2018. This suggestion is conditioned by successful implementation of new tungsten extraction projects, and full application of tungsten recycling methods.
Zaprezentowano szacunkową prognozę światowego popytu i podaży wolframu w roku 2018. Wartości liczbowe otrzymano poprzez ekstrapolację wielkości charakteryzujących trendy w produkcji wolframu od roku 1905 oraz trendy w zakresie popytu licząc od roku 1964. Ponadto, podano szacunkowe dane o wielkości produkcji, wzięto także pod uwagę firmy inwestujące w tym obszarze, uwzględniając realizacje nowych inwestycji w dziedzinie produkcji wolframu oraz możliwe zakończenie wydobycia. Przyjmuje się, że podaż wolframu roku 2018 zrównoważy popyt. Założenie to uwarunkowane jest zakończeniem realizacji nowych inwestycji w dziedzinie wydobycia oraz zastosowaniem na pełną skalę działań mających na celu recykling i odzysk wolframu.
Źródło:
Archives of Mining Sciences; 2017, 62, 1; 3-12
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Order quantity distributions: estimating an adequate aggregation horizon
Autorzy:
Eriksen, P. S.
Nielsen, P.
Powiązania:
https://bibliotekanauki.pl/articles/407385.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
demand distribution
poisson processes
order quantities
coefficient of variation
planning
control
Opis:
In this paper an investigation into the demand, faced by a company in the form of customer orders, is performed both from an explorative numerical and analytical perspective. The aim of the research is to establish the behavior of customer orders in first-come-first-serve (FCFS) systems and the impact of order quantity variation on the planning environment. A discussion of assumptions regarding demand from various planning and control perspectives underlines that most planning methods are based on the assumption that demand in the form of customer orders are independently identically distributed and stem from symmetrical distributions. To investigate and illustrate the need to aggregate demand to live up to these assumptions, a simple methodological framework to investigate the validity of the assumptions and for analyzing the behavior of orders is developed. The paper also presents an analytical approach to identify the aggregation horizon needed to achieve a stable demand. Furthermore, a case study application of the presented framework is presented and concluded on.
Źródło:
Management and Production Engineering Review; 2016, 7, 3; 39-48
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 42

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