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Wyświetlanie 1-15 z 58
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:
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:
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:
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:
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:
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:
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:
Service level in model of inventory location with stochastic demand
Autorzy:
Bieniek, M.
Powiązania:
https://bibliotekanauki.pl/articles/223581.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
inventory location
stochastic demand
safety stock
service level
safety factor
lokalizacja zapasów
magazyn centralny
bezpieczeństwo
poziom usług
współczynnik bezpieczeństwa
Opis:
In this paper we consider the influence of the safety factor on the decision of the inventory location. This decision is done based on the model which centralizes or decentralizes the safety stock. In this model we have to choose between the location of the inventory in the regional warehouses or the location in the central warehouse. The decision is made due to the minimizing the holding costs and the supply costs of the safety stock from the central warehouse to the customer. The main assumption is that the customers have the stochastic demands on the inventory items. Moreover, the customers’ demands have the known distribution with the known parameters. The complex analysis of the influences of possible probabilistic demands' distributions on the safety factors is conducted. The numerical computations for the safety factors used in the facility location model are also presented. In numerical examples we take into considerations the demands’ distributions the most often used in practice like the normal, the Poisson, the Gamma and the exponential distribution. Some graphs for the safety factors of these distributions are also drawn. Moreover for the mentioned demands’ distributions the model of the safety stock location depends on the specific factors. Among other things these factors are the mean and the variance of the demand, the number of the regional warehouses, the assumed service level, and some cost factors like the holding costs and the transportation costs. Some graphs which illustrated the dependence of the model elements on some listed before parameters are presented and their influence on the location decision is studied also.
Źródło:
Archives of Transport; 2014, 31, 3; 7-21
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
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:
Energy Demand of Compressor Machines Used in Foundry Plants
Autorzy:
Ziółkowski, E.
Smyksy, K.
Wrona, R.
Brzeziński, M.
Powiązania:
https://bibliotekanauki.pl/articles/382369.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
automation
foundry plant
energy demand
compressor machine
air installation
automatyzacja
zakład odlewniczy
zapotrzebowanie na energię
kompresor powietrza
klimatyzacja
Opis:
The paper investigates the issues relating to energy consumption in the compressed air installations in foundry plants. Basing on the general characteristics of modern compressors, the major factor and conditions are identified that affect the energy consumption by compressor machines in installations with equalising tanks. Selected aspects are addressed on the basis of measurement data of a screw compressor available in the laboratory of the Faculty of Foundry Engineering AGH-UST.
Źródło:
Archives of Foundry Engineering; 2013, 13, 2 spec.; 112-115
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distributed active demand response system for peak power reduction through load shifting
Autorzy:
Benysek, G.
Jarnut, M.
Wermiński, S.
Bojarski, J.
Powiązania:
https://bibliotekanauki.pl/articles/202050.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
power system
demand side management
load shifting
thermostatic device
system zasilania
zarządzanie popytem
urządzenie termostatyczne
Opis:
The large variability in power consumption in electrical power systems (EPS) influences not only growth balance losses and technical losses, but also in some cases reduces energy security. Delayed restoration of power generation, combined with unpredictable weather events leading to the loss of generating power can lead to a situation in which to save the stability of the power system there must be introduced in the system a load power limit or even disconnection of end-user in a given area, which will significantly reduce the comfort of use of energy. This situation can be prevented through either the building of new intervention power units or the aggregated use of new energy technologies, such as distributed network resources (DER), which are part of an intelligent Smart Grid network. Such resources bring together virtual power plants (VPP) and demand side management (DSM). The article presents an alternative decentralized active demand response (DADR) system, that by acting on selected groups of loads reduces peak loads with minimized loss of comfort of energy in use for the end-user. The system operates without any communication. The effectiveness of the proposed solution has been confirmed, outlined in test results obtained by the authors from a developed analytical model, which also contains stochastic algorithms to decrease the negative impact of such DSM systems on the power system (power overshoot and oscillation).
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 4; 925-936
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparing Probabilistic Economic Order Quantity and Periodic Order Quantity Model Performance Under Lumpy Demand Environment
Autorzy:
Nurprihatin, Filscha
Rembulan, Glisina Dwinoor
Pratama, Yohanes Dwi
Powiązania:
https://bibliotekanauki.pl/articles/2201156.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
lumpy demand
material requirements planning
probabilistic economic order quantity
periodic order quantity
aggregate plan
Opis:
Improper planning of inventory will affect the factory operating costs, building costs, the cost of loss, and the cost of product defects due to being stored for too long which will eventually become a loss. This research discusses the processing industry which is experiencing lumpy demand. In carrying out the production process, the company has never made plans for future demand, resulting in a waste of message costs due to repeated orders of raw materials ordered to suppliers. This paper contributes to overcoming this issue by simulating future demand by using the Material Requirement Planning (MRP) method with a probabilistic Economic Order Quantity (EOQ) and Periodic Order Quantity (POQ) model. The demand in the coming period is determined using the Autoregressive Integrated Moving Average (ARIMA) method, and an aggregate plan is carried out to determine the regular cost of raw material production and optimal subcontracting. The final analysis states that the calculation of MRP on the selected items using POQ produces the lowest cost for planning S45C-F, SGT-R, and SKD11-R, while SLD-R uses the probabilistic EOQ method.
Źródło:
Management and Production Engineering Review; 2022, 13, 4; 16--25
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exploring on-demand service use in large urban areas: the case of Rome
Autorzy:
Nuzzolo, Agostino
Comi, Antonio
Polimeni, Antonio
Powiązania:
https://bibliotekanauki.pl/articles/223789.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
transport services
demand analysis
dial a taxi
exploitation costs
public transport
usługi transportowe
analiza popytu
wybór taksówki
koszty eksploatacji
transport publiczny
Opis:
Traditional and innovative on-demand transport services, such as taxi, car sharing or dial-a-ride respectively, can provide a level of flexibility to the public transport with the aim to guarantee a better service and to reduce the exploitation costs. In this context, in order to point out the key-factors of on-demand services, this study focuses on traditional on-demand service (such as taxi one), and presents the results of a demand analysis and modelling, obtained processing taxi floating car data (FCD) available for the city of Rome. The GPS position of each taxi is logged every few seconds and it was possible to build a monthly database of historical GPS traces through around 27 thousands of GPS positions recorded per day (more than 750 thousands for the entire month). Further, the patterns of within-day and day-to-day service demand are investigated, considering the origin, the destination and other characteristics of the trips (e.g. travel time). The time-based requests for taxi service were obtained and used to analyse the trip distribution in space and on time. These analyses allow us to forecast trips generated/attracted by each zone within the cities according to land use characteristics and time slices. Therefore, a regression tree analysis was developed and different regressive model specifications with different set of attributes (e.g. number of subway stations, number of zonal employees, population) were tested in order to assess their contribution on describing such a service use.
Źródło:
Archives of Transport; 2019, 50, 2; 77-90
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comprehensive forecast of electromobility mid-term development in Poland and its impacts on power system demand
Autorzy:
Piotrowski, P.
Baczyński, D.
Robak, S.
Kopyt, M.
Piekarz, M.
Polewaczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/200741.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mid-term forecast
electromobility
electric vehicle (EV)
power system demand
load profile
Opis:
This paper discusses three variants of how e-mobility development will affect the Polish Power System. Multivariate forecasts of annual new registrations of electric vehicles for up to seven years are developed. The forecasts use the direct trend trend extrapolation methods,methods based on the deterministic chaos theory, multiple regression models, and the Grey model. The number of electric vehicles in use was determined for 2019‒2025 based on the forecast new registrations. The forecasts were conducted in three variants for the annual electric energy demand in 2019‒2025, using the forecast number of electric vehicles and the forecast annual demand for electric energy excluding e-mobility. Forecasts were conducted in three variants for the daily load profile of power system for winter and summer seasons in the Polish Power system in 2019–2025 based on three variants of the forecast number of electric vehicles and forecast relative daily load profiles.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 4; 697-709
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 58

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