Skocz do pozycji: 1.

Tytuł:

Demand forecasting in an enterprise – the forecasted variable selection problem

Autorzy:

Dittmann, Paweł
Sobolewski, Adam Michał

Powiązania:

https://bibliotekanauki.pl/articles/425024.pdf

Data publikacji:

2013

Wydawca:

Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu

Tematy:

demand
demand forecasting
operational measures of demand

Opis:

Forecasting process efficiency depends – to a large extent – on the correct determination of the forecasted variable. Therefore, companies should use for sales forecasting, the variables that reflect actual consumer demand. However in practice, since demand is usually not directly observable, many operational measures of demand are used. In the manufacturing and retail enterprises, the most often used variables are historical orders, shipments, and billed sales volumes. The purpose of this paper is to characterise the effects of using as the predicted variable, different operational measures of consumer demand. Theoretical discussion is illustrated by an attempt to estimate errors in demand forecasts for Avon Cosmetics’ products that are related to changes in data used for forecasting.

Źródło:

Econometrics. Ekonometria. Advances in Applied Data Analytics; 2013, 1(39); 61-70
1507-3866

Pojawia się w:

Econometrics. Ekonometria. Advances in Applied Data Analytics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Elasticity of consumer demand: estimation using a QuadRatic Almost Ideal Demand System
Elastyczność popytu konsumpcyjnego: estymacja na podstawie Quadratic Almost Ideal Demand System

Autorzy:

Gostkowski, Michał

Powiązania:

https://bibliotekanauki.pl/articles/424811.pdf

Data publikacji:

2018

Wydawca:

Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu

Tematy:

complete demand system
Quadratic Almost Ideal Demand System
QUAIDS
elasticity of demand

Opis:

This paper analyzes consumer demand using a Quadratic Almost Ideal Demand System (QUAIDS), which is an extension of an Almost Ideal Demand System (a complete demand system). Complete demand system models can be used to find the relationships that are impossible to discover using single-equation models. Additionally, the QUAIDS model can be used to model a nonlinear Engel curve. The research was based on household microeconomic data collected by GUS (the Polish Central Statistical Office) in the period 1999-2015. The complete demand model has been extended by demographic variable. The results show that the QUAIDS model does not reduce to the AIDS model and is an adequate tool to analyze consumer demand.

Źródło:

Econometrics. Ekonometria. Advances in Applied Data Analytics; 2018, 22, 1; 68-78
1507-3866

Pojawia się w:

Econometrics. Ekonometria. Advances in Applied Data Analytics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

The importance of demographic variables in the modeling of food demand

Autorzy:

Dudek, Hanna

Powiązania:

https://bibliotekanauki.pl/articles/453507.pdf

Data publikacji:

2010

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki

Tematy:

complete demand system
demographic variables
elasticity of demand

Opis:

The general objective of this research is to assess the impact of demographic variables on food demand in Poland. The empirical analysis of this paper is based on the household data, collected by GUS (Central Statistical Office) in the years 2001-2004 (household budget data).

Źródło:

Metody Ilościowe w Badaniach Ekonomicznych; 2010, 11, 1; 60-69
2082-792X

Pojawia się w:

Metody Ilościowe w Badaniach Ekonomicznych

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

Demand forecasting in a business based on experts’ opinions – an application of weibull distributions

Autorzy:

Dittmann, Paweł

Powiązania:

https://bibliotekanauki.pl/articles/424785.pdf

Data publikacji:

2013

Wydawca:

Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu

Tematy:

demand
demand forecasting
experts’ opinions
Weibull distribution applications

Opis:

Demand forecasts in a business may be constructed by various methods, e.g. by using Type-I formal models, or by using type-II formal models based on experts’ opinions. The experts can be the business’s managers or persons from outside of the studied business. The experts can not only construct forecasts, but also subjectively specify the probability of them coming true. In this article, the Weibull distribution is described, a distribution that may be applied in the process of constructing product demand forecasts for a business. The methodology for constructing a point forecast is explained, along with the methods for evaluating the chances of the forecast coming true and the methods for judging the probability connected with sales profitability.

Źródło:

Econometrics. Ekonometria. Advances in Applied Data Analytics; 2013, 1(39); 52-60
1507-3866

Pojawia się w:

Econometrics. Ekonometria. Advances in Applied Data Analytics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Legislative barriers to the development of DSR services in Poland
Bariery legislacyjne dla rozwoju usług DSR w Polsce

Autorzy:

Chylmański, P.
Kroczek, A.

Powiązania:

https://bibliotekanauki.pl/articles/397412.pdf

Data publikacji:

2017

Wydawca:

ENERGA

Tematy:

demand management
aggregator
Demand Side Response
zarządzanie popytem
agregator

Opis:

The paper reports steps taken by Enspirion sp. z o.o. to develop DSR services in the Polish market. The authors focused on characterizing the target market, as well as identifying legislative barriers that prevent further development of aggregator activities.
W artykule opisano działania podejmowane przez Enspirion sp. z o.o., zmierzające do rozwoju usług DSR na polskim rynku. Autorzy skupili się na scharakteryzowaniu rynku docelowego, a także wskazaniu barier legislacyjnych, które uniemożliwiają dalszy rozwój działalności podmiotów agregacyjnych.

Źródło:

Acta Energetica; 2017, 2; 17-23
2300-3022

Pojawia się w:

Acta Energetica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Prognozowanie potencjału popytowego dla miejscowości nie posiadających dostępu do sieci kolejowej
Forecasting the demand potential for towns without access to the railway Network

Autorzy:

Chyliński, Piotr

Powiązania:

https://bibliotekanauki.pl/articles/29433514.pdf

Data publikacji:

2022

Wydawca:

Stowarzyszenie Inżynierów i Techników Komunikacji Rzeczpospolitej Polskiej

Tematy:

transport kolejowy
popyt
potencjał popytowy
rail transport
demand
demand potential

Opis:

W artykule przedstawiono tło gospodarcze zaniku obsługi pasażerskiej koleją niektórych miast powiatowych na przełomie lat 90-tych ubiegłego stulecia i pierwszej dekady XXI wieku, oraz szanse i możliwości na ponowne ich włączenie w sieć przewozów kolejowych. W związku z procesem realizacji dokumentacji przedprojektowych dla programu „Kolej Plus” obejmującego przywracanie połączeń pasażerskich, omówiono problematykę prognozowania potencjału popytowego w transporcie kolejowym. Przedstawiono prostą metodę szacowania potencjału dla miejscowości, które nigdy takiego połączenia nie miały, bądź utraciły je w wyniku likwidacji linii lokalnych.
The article presents the economic background of the closure of passenger service by rail in some county towns at the turn of the 1990s and the first decade of the 21st century, and the chances and opportunities for their reintroduction into the rail transport network. In connection with the process of realisation of pre-project documentation for the Kolej Plus programme including the restoration of passenger connections, the problem of forecasting the demand potential in railway transport was discussed. A simple method of estimating the potential was presented for towns, which have never had such a connection or have lost it as a result of liquidation of local lines.

Źródło:

Transport Miejski i Regionalny; 2022, 6; 23--26
1732-5153

Pojawia się w:

Transport Miejski i Regionalny

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Information demand of foreign labor market from the point of view of Chinese students

Autorzy:

Pilarczyk, Anna
Naprawski, Tomasz

Powiązania:

https://bibliotekanauki.pl/articles/692575.pdf

Data publikacji:

2020

Wydawca:

Uniwersytet Ekonomiczny w Poznaniu

Tematy:

information-logistics engine
information demand analysis
information demand model
foreign labour market
demand-oriented management of information

Opis:

Today people are faced with a huge amount of information. Demand-oriented management of information can resolve this issue. Therefore, the measures that filter this information are the desired solution.  One of these measures is information demand analysis, which can be easily used for defining problems on the labour market, where the term of talent import is becoming increasingly important. The main contribution of this study is the analysis of the challenges facing the foreign labour market from the point of view of an employee and an employer and a proposal of an information demand model for strengthening the foreign labour market information system. The information demand model is one of the stages of the development of an information-logistics engine, which ensures that the right information is available in the right location, time and quality.

Źródło:

Research Papers in Economics and Finance; 2020, 4, 1; 31-35
2543-6430

Pojawia się w:

Research Papers in Economics and Finance

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Analysis and forecast of passenger flows in public transport - the case of Poland

Autorzy:

Gorzelanczyk, Piotr
Pawłowski, Adrian

Powiązania:

https://bibliotekanauki.pl/articles/22615545.pdf

Data publikacji:

2023

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie

Tematy:

demand
urban transport
Polska

Opis:

Public transportation provides its services to both urban centers and neighboring areas in the immediate vicinity of the city. The problem of urban transportation is evident, the number of people willing to use public transportation has decreased. Therefore, there is a need to delve into the issue and conduct an analysis of the demand for urban transportation in Poland in 2000-2030, this will allow us to assess in what direction urban transportation is heading, whether there is an increase in the number of people using it, or whether there is a downward trend (Zielińska 2018). Based on CSO statistics from 2009-2020 for the analysis of demand for public transportation in Poland, a forecast of people using public transportation was conducted using Statistica software for 2021-2030. Due to the situation with the COVID-19 pandemic, the study was conducted in 2 ways – with and without 2020. Public transportation will make less and less profit and even losses for the next few years through rising gasoline and energy prices. Virtually in each of the provinces, and likewise throughout Poland, a decline in the number of people willing to use public transportation is evident. conclusions. On the basis of the surveys carried out, there is a general trend that shows the current state of public transport. In most of the cases studied, a similar conclusion emerges, namely that public transport will experience a marked decline in the coming years. The number of people who want to use public transport will decrease, mainly due to the COVID-19 pandemic and people’s fears for their own safety.

Źródło:

Technical Sciences / University of Warmia and Mazury in Olsztyn; 2023, 26(1); 161--184
1505-4675
2083-4527

Pojawia się w:

Technical Sciences / University of Warmia and Mazury in Olsztyn

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Demand for private health insurance: an empirical study of post-communist countries

Autorzy:

Śliwiński, Adam
Borkowska, Iwona

Powiązania:

https://bibliotekanauki.pl/articles/33735048.pdf

Data publikacji:

2024-07-02

Wydawca:

Szkoła Główna Handlowa w Warszawie. Kolegium Zarządzania i Finansów

Tematy:

health insurance
demand analysis

Opis:

The development of voluntary health insurance is characteristic of post-Communist and CEE countries. The aim of the paper is to identify the factors determining the demand for private voluntary health insurance. The main finding of the research is that the most important factor is the demographic factor. Other factors include the factor related to the ineffectiveness of treatment under universal health insurance, the factor related to health condition, the demographic factor related to longevity, and the factor related to insurance awareness and income. The research confirms conclusions from previously published studies. The most important is to confirm that the income factor positively influences the studied phenomenon. However, the results shed new light on the aspect of the demand factor, as this indicates the ageing of society and the consequent increase in private spending on health, which are the key mechanisms in the discussion, with the other factors constituting a complementary element.

Źródło:

Journal of Management and Financial Sciences; 2023, 50; 109-129
1899-8968

Pojawia się w:

Journal of Management and Financial Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

Popyt mieszkaniowy a przestrzeń miejska – przegląd literatury
Housing demand and urban transformations – literature review

Autorzy:

Głuszak, Michał
Marona, Bartłomiej

Powiązania:

https://bibliotekanauki.pl/articles/434652.pdf

Data publikacji:

2013

Wydawca:

Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu

Tematy:

housing
demand
urban structure

Opis:

The article discusses housing demand. We focus on disequilibrium of a urban housing market and location derived segmentation. Based on literature review, we identify reasons behind housing mobility and housing location choice at household level. In the second part of the article we focus on the interaction between housing demand of urban development patterns (especially spatial aspects of it). The main objective of this paper is to show the relationship between two major dimensions of individual housing demand: (i) mobility choice and (ii) location choice and spatial transformations within the metropolitan area. The article is a critical analysis of the literature. We attempt to identify the main factors affecting the demand for housing in a specific metropolitan area. Previous studies point to a number of factors affecting the residential mobility of households. The most important are: the life cycle, relative deprivation, social capital, gender and economic situation. Studies show that these factors are correlated and are subject to mutual interactions. Reflections on diversity and segmentation of metropolitan housing markets lead to the conclusion that the local housing market can be seen as a nested structure. Each metropolitan housing market is divided into submarkets − based on location and housing services quality. The housing search is therefore sequential and hierarchical in nature. Among the most important factors determining the household choice of location within the local housing market are: economic capital, social status, spatial relationships, lifestyle, racial segregation and the quality of schools. The synthesis of the results leads to the conclusion that the demand for housing is related to certain spatial phenomena occurring in metropolitan areas. We highlight four aspects in particular:– – communication system (mass transit, road system, parking in the city center), – spatial order, – access to schools and public services (excessive density of housing and inadequate social infrastructure), – urban sprawl. Due to the information asymmetry and inelastic supply in housing market subsegments it can cause persistent imbalances and emergence of deprived areas within the urban structure.

Źródło:

Ekonomia - Uniwersytet Ekonomiczny we Wroclawiu; 2013, 3 (24); 119-133
2080-5977

Pojawia się w:

Ekonomia - Uniwersytet Ekonomiczny we Wroclawiu

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

FINANCIAL INSURANCE FOR ENTERPRISES – ANALYSIS OF DEMAND AND SUPPLY

Autorzy:

Wicka, Aleksandra

Powiązania:

https://bibliotekanauki.pl/articles/1818403.pdf

Data publikacji:

2020-04-10

Wydawca:

Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach

Tematy:

financial insurance
enterprises
demand

Opis:

The aim of the article is to assess changes in the enterprises’ demand for financial insurance. The analysis covered expenses incurred by business entities on purchase thereof and supply by the entity. Data used in the study came from secondary sources published in studies by the Polish Financial Supervision Authority (KNF), the Polish Chamber of Insurance (PIU) and the Central Statistical Office (GUS). Furthermore, information from the studies-related literature has been included. The time period of studies covered the years 2005–2018. Selected types of insurance included in financial insurance have been presented herein and industries which these products are especially targeted at have been indicated. Moreover, supply by entities has been discussed with an indication of insurers who hold a leading position in the financial insurance sales in Poland. It has been stated that the demand (by value) for financial insurance in the years 2005–2018 was growing. The amount of the gross premium written in 2018 was twice as high as in 2005 and amounted to PLN 1.09 billion. Furthermore, it has been determined that the highest average dynamics of market growth concerned insurance from various financial risks (group 16), which are usually offered jointly with other insurance products, but also the dynamics of expenses incurred on purchasing surety was over 200%, whereas, in 2018 it was even 360%.

Źródło:

Zeszyty Naukowe Uniwersytetu Przyrodniczo-Humanistycznego w Siedlcach; 2019, 50, 123; 29-36
2082-5501

Pojawia się w:

Zeszyty Naukowe Uniwersytetu Przyrodniczo-Humanistycznego w Siedlcach

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

Status prawny mediów spersonalizowanych
The legal status of personalized media

Autorzy:

Skrzypczak, Jędrzej

Powiązania:

https://bibliotekanauki.pl/articles/508589.pdf

Data publikacji:

2015-11-30

Wydawca:

Uniwersytet Warszawski. Wydawnictwo Naukowe Wydziału Zarządzania

Tematy:

media spersonalizowane
media on-demand
status prawny mediów sperso-nalizowanych
status prawny video-on demand
status prawny radio-on demand
personalized media
legal status of video-on demand
legal status of radio-on demand

Opis:

Rewolucja technologiczna wywiera ogromny wpływ na sposób funkcjonowania rynku medialnego, ale także na regulacje prawne w tym obszarze. Rozwój medialnych technologii cyfrowych dopro-wadził do stworzenia wielu nowych kategorii przekazów i modyfi kacji tradycyjnych schematów komunikowania. Jednym z najciekawszych przykładów tych zjawisk są tzw. media spersonalizo-wane. Status prawny mediów spersonalizowanych może budzić spore wątpliwości, tym bardziej że odnosi się do wielu płaszczyzn regulacyjnych i rozmaitych instytucji prawnych. Artykuł próbuje rozstrzygnąć jak należy – z punktu widzenia obowiązującego prawa – kwalifi kować taki rodzaj przekazów.
A dynamic development of media-related digital technologies has been observed throughout recent decades. These phenomena are conducive to significant social, economic, political and legal transformations. The development of digital media has led to the creation of many new categories of transfers and modifications of traditional communication patterns. One of the most interesting examples of these phenomena is personalized media. This could be media on-demand, but also media available via streaming, tailored to the needs of a specific recipient. The legal status of personalized media is surrounded by many doubts. This paper focuses on analyzing the legal rules defining the formal status of personalized media in the EU (particularly in the context of the Audiovisual Media Services Directive) as well as in Poland (the Broadcasting Act of 29 December 1992).

Źródło:

internetowy Kwartalnik Antymonopolowy i Regulacyjny; 2015, 4, 7; 8-18
2299-5749

Pojawia się w:

internetowy Kwartalnik Antymonopolowy i Regulacyjny

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Ilościowo-jakościowa ocena popytu na rynku hotelowym: propozycja nowego wskaźnika
Quantitative and qualitative assessment of demand on the hotel market: proposal of a new indicator

Autorzy:

Dziedzic, Tomasz

Powiązania:

https://bibliotekanauki.pl/articles/529687.pdf

Data publikacji:

2013

Wydawca:

Szkoła Główna Turystyki i Rekreacji

Tematy:

popyt hotelowy
wskaźnik popytu hotelowego
wskaźnik popytu w układzie regionalnym
analiza benchmarkowa popytu
hotel demand
indicator of hotel demand
indicator of demand in regional composition
benchmark analysis of demand

Opis:

W artykule zaprezentowano propozycję nowego wskaźnika oceny popytu na rynku hotelowym. Nowy wskaźnik ma charakter syntetyczny i oprócz elementu ilościowego (liczba udzielonych noclegów lub liczba korzystających) uwzględnia także strukturę jakościową sprzedawanej bazy hotelowej oraz stopień jej wykorzystania (aspekt efektywności). Przedstawiono dane wyjściowe charakteryzujące polski rynek usług noclegowych, przesłanki dla budowy kilkuelementowego, syntetycznego wskaźnika popytu oraz jego założenia metodologiczne. Na tej podstawie dokonano obliczeń wartości wskaźnika opierając się na danych empirycznych zbieranych przez Główny Urząd Statystyczny w latach 2000-2011. Dane opracowano w dwóch grupach: dla całej Polski oraz dla poszczególnych województw. W obu przypadkach pokazano dynamikę zmian na polskim rynku hotelowym. Posłużyło to w ostatniej części artykułu zastosowaniu wskaźnika popytu hotelowego do regionalnej analizy benchmarkowej.
The article proposes a new indicator for the estimation of demand on the hotel market. This new indicator is synthetic in character and, in addition to the quantitative aspect (the number of overnight stays or number of hotel guests), it takes into account the qualitative structure of the offer of hotel beds and their occupancy rate (the effectiveness aspect). The author presents output data characterizing the tourist accommodation market in Poland, prerequisites for building a multifactor synthetic indicator of demand, and the methodological premises thereof. On these grounds indicator values are calculated from empirical data collected by the Central Statistical Office of Poland in 2000-2011. The indicator values are then compiled on two levels: national and regional (according to voivodships). In these two planes the dynamics of changes on the Polish hotel market are shown. In the last part of the article, the hotel demand indicator is used as a tool in regional benchmark analysis.

Źródło:

Problemy Turystyki i Rekreacji; 2013, 1; 5-26
2084-5154

Pojawia się w:

Problemy Turystyki i Rekreacji

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

A new approach to maximize the overall return on investment with price and stock dependent demand under the nonlinear holding cost

Autorzy:

Bhadoriya, Amrita
Jani, Mrudul Y.
Chaudhari, Urmila
Tadvi, Aniket C.

Powiązania:

https://bibliotekanauki.pl/articles/2183485.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Instytut Badań Systemowych PAN

Tematy:

deterioration
nonlinear holding cost
price-dependent demand
stock dependent demand
profit/cost ratio

Opis:

This study investigates an inventory model for deteriorating products with a price and stock-dependent demand pattern where the holding cost is a non-linear function of both time and stock level. Moreover, a decreased price and a higher stock level lead to a higher rate of demand. Consequently, in this article, we present a new approach, aiming at maximization of the return on investment by maximizing the profit/cost ratio. If an inventory manager has the potential to invest in a variety of projects, but disposes of only limited resources, it is logical to strategically plan towards a better return on investment. As a result, the manager’s objective will be to develop an inventory policy with a possibly high return on investment. Therefore, a new strategy is considered in this article to optimize the profitability ratio in terms of replenishment time and selling price, which is determined as the proportion between the profit and the overall cost of the inventory scheme. This research demonstrates that optimizing the profitability ratio is equivalent to decreasing the average inventory cost of a product per unit. Also, the optimality is graphically checked and one numerical illustration is discussed to explain the result of the proposed model. Finally, sensitivity analysis of key parameters is performed to show the applicability of the proposed model. The profit/cost ratio is more sensitive to price elasticity markup or purchasing cost compared to the other parameters used. Also, for decision-makers, several helpful management insights are derived.

Źródło:

Control and Cybernetics; 2022, 51, 1; 91--108
0324-8569

Pojawia się w:

Control and Cybernetics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Wastewater Treatment Methods for Effluents from the Confectionery Industry – an Overview

Autorzy:

Zajda, Magdalena
Aleksander-Kwaterczak, Urszula

Powiązania:

https://bibliotekanauki.pl/articles/124113.pdf

Data publikacji:

2019

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

confectionery industry
wastewater treatment
biological oxygen demand
chemical oxygen demand
low-cost material

Opis:

Wastewater from the confectionery industry is characterized by daily and seasonal variability of composition and quantity which adversely affects the process of their disposal. Confectionery plants discharge about 300-500 m³ per month of technological wastewater. Sewage from the confectionery industry belongs to biologically degradable. It is characterized by high values of chemical oxygen demand (COD) and biological oxygen demand (BOD). The article reviews various methods used to treat wastewater from the confectionery industry. Attention was paid to the applicability of a particular method, its advantages and disadvantages and the costs of implementation. The technology of industrial wastewater treatment uses both mechanical and physicochemical methods as well as biological ones. Techniques of sewage treatment usually consist of several stages which use different processes. Low-cost materials such as natural minerals, agricultural waste, industrial waste, biosorbents, and others contribute to the improvement of aerobic sewage conditions. The main weakness of typical sewage treatment plants is their large area, high investment, and exploitation costs. Therefore, a good solution may be the use of the membrane biological reactor which combines the classical technique of activated sludge and filtration on micro-filtering membranes.

Źródło:

Journal of Ecological Engineering; 2019, 20, 9; 293-304
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Optimization of transport potential of the transportation company taking into account random demand for transport services

Autorzy:

Konopacki, Gustaw

Powiązania:

https://bibliotekanauki.pl/articles/94887.pdf

Data publikacji:

2019

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie

Tematy:

transport potential
demand
stochastic process

Opis:

Is considered a transport company, which operates a uniform in the sense of destination, means of transport for example tankers, with random exploitation characteristics. The company's transport potential is measured by the number of transportable means of transport for a sufficiently long period of time. The company operates on the market of transport services, where the demand for transport services is also random. The problem of optimizing the transport potential of a transport company is being considered, taking into account the random demand for transport services.

Źródło:

Information Systems in Management; 2019, 8, 1; 15-25
2084-5537
2544-1728

Pojawia się w:

Information Systems in Management

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Assessment of the degree of fitting the transport potential of the transportation company to a random demand for transport services

Autorzy:

Konopacki, G.

Powiązania:

https://bibliotekanauki.pl/articles/94939.pdf

Data publikacji:

2018

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie

Tematy:

transport potential
demand
stochastic process

Opis:

Will be considered transport company exploiting the uniform in the sense of destination, means of transport such as tankers, with a total transport potential equal to a loading units (e.g. tones). The company operates in the transport market, where demand for transport services is random. The problem of fitting the transport potential of a transport company to the demand for such services is formulated. As measure of this fit assumes that the probability of a firm's transport potential is not being exceeded by demand over the given time horizon. Practically useful formulas for estimating such probability for cases where demand for transport services is described by stationary and non-stationary normal stochastic processes. The results are illustrated by numerical examples.

Źródło:

Information Systems in Management; 2018, 7, 2; 120-132
2084-5537
2544-1728

Pojawia się w:

Information Systems in Management

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

ANALIZA POPYTU KONSUMPCYJNEGO Z WYKORZYSTANIEM MODELU AIDS
ANALYSIS OF THE CONSUMER DEMAND USING THE ALMOST IDEAL DEMAND SYSTEM

Autorzy:

Gostkowski, Michał

Powiązania:

https://bibliotekanauki.pl/articles/453734.pdf

Data publikacji:

2015

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki

Tematy:

kompletny model popytu
prawie idealny układ równań popytowych
AIDS
elastyczność popytu
complete demand system
Almost Ideal Demand System
elasticity of demand

Opis:

W pracy podjęto próbę analizy popytu konsumpcyjnego z wykorzystaniem kompletnego modelu popytu AIDS. Badania zostały oparte na wynikach badań budżetów gospodarstw domowych w okresie 1999-2012. Dodatkowo kompletny model popytu został rozszerzony o zmienną demograficzną oraz o zmienną czasową. W pracy został również poruszony problem zerowych wydatków oraz problem współliniowości zmiennych. Wyniki badań wskazują, że uwzględnienie zmiennych demograficznych oraz zmiennej czasowej istotnie wpływa na oszacowania współczynników elastyczności. Dodatkowo badania wskazały na region wschodni (obejmującym województwa lubelskie, podkarpackie, podlaskie oraz świętokrzyskie) jako region charakteryzujący się najbardziej odmienną strukturą popytu w porównaniu do pozostałych regionów.
The paper attempts to analyze consumer demand using a complete demand system AIDS. The complete demand system is the right tool for the analysis of consumer demand because it takes into account the phenomenon of substitutability and complementarity. The research was based on household microeconomic data collected by GUS (the Polish Central Statistical Office) in the period 1999-2012. Additionally, a complete demand model has been extended by the demographic variable and the time variable. The problem of zero expenditures and the collinearity of variables were described in the paper. The results show that taking into account the phenomena of substitutability and complementarity allows a better understanding of complex interactions occurring in the market for consumer goods and services

Źródło:

Metody Ilościowe w Badaniach Ekonomicznych; 2015, 16, 3; 70-82
2082-792X

Pojawia się w:

Metody Ilościowe w Badaniach Ekonomicznych

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Influence of the demand planning process on logistic system reliability. Case study

Autorzy:

Szozda, N.
Werbińska-Wojciechowska, S.

Powiązania:

https://bibliotekanauki.pl/articles/343820.pdf

Data publikacji:

2011

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

demand planning
logistic system reliability

Opis:

Authors define the main elements affecting the right logistic system performance level and investigate the possible connections between demand process planning quality and logistic system reliability. Thus, the definitions of logistic system reliability are described. Later, an overview of some recent developments in the analyzed research area is provided. In the next point, authors present the main elements affecting the reliable and available logistic system performance. Finally, the paper is ended by the presentation of the obtained analysis results in comparison with the knowledge about the case companies' present condition.

Źródło:

Total Logistic Management; 2011, 4; 147-166
1689-5959

Pojawia się w:

Total Logistic Management

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Household Money Holdings in the Euro Area: An Explorative Investigation

Autorzy:

Seitz, Franz
von Landesberger, Julian

Powiązania:

https://bibliotekanauki.pl/articles/565699.pdf

Data publikacji:

2014

Wydawca:

Uniwersytet Warszawski. Wydawnictwo Naukowe Wydziału Zarządzania

Tematy:

money demand
cointegrated VARs
households

Opis:

In this paper we analyse household holdings of the broad monetary aggregate M3 in the euro area from 1991 until 2009. Households are the largest money-holding sector in the euro area. We develop four models, two in nominal, two in real terms, with satisfactory economic and statistical properties. The main determinants are a transactions variable, wealth considerations, opportunity costs and uncertainty. In particular housing wealth is found to play an important role. The models are robust to different estimation strategies, samples considered and a multitude of misspecification tests. According to our analysis, it is quite apparent that in equilibrium, households jointly determine consumption and broad money holdings which are both influenced by wealth as well as interest rates. The importance of household money holdings for consumption expenditures may cast doubt on a purely passive role for money.

Źródło:

Journal of Banking and Financial Economics; 2014, 2(2); 83-115
2353-6845

Pojawia się w:

Journal of Banking and Financial Economics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

Non-Uniformity of Water Demands in a Rural Water Supply System

Autorzy:

Gwoździej-Mazur, Joanna
Świętochowski, Kamil

Powiązania:

https://bibliotekanauki.pl/articles/125303.pdf

Data publikacji:

2019

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

rural water supply
demand pattern

Opis:

The increasingly frequent use of computer simulations for the calculations concerning the water supply systems requires accounting for the demand patterns. Determining the coefficients of daily and hourly non-uniformity is indispensable for the correct designing or modernization of pipes in the water supply network. The first goal of article was to obtain the non-uniformity index for the preparation of hydraulic models in rural water systems called "N" system and "CWK" system. In this article, the authors present the results of the water consumption analysis in two rural water supply systems. The article presents the water consumption non-uniformity factors calculated over the course of a year, a month and a day. The article also included the calculated water demand curves over the course of a day, showing the variability of water demand with characteristic morning and evening water consumption peaks and changes of the consumption curve in the prospective development of the water supply network, where industrial consumers would become the main water consumers. The research material consisted of the water consumption measurements in two rural water supply networks situated in northeastern Poland, taken over the years 2010-2017. The article also shows the water demand curves in the studied rural water supply networks for every day of the week. The values of minimum and maximum hourly non-uniformity coefficients were compared to the mean value of these coefficients. The changes in the values of minimum and maximum hourly coefficients with respect to the mean value for the given hour may differ from -89% to +85% for hours of minimum demand. The changes in the values of minimum and maximum hourly coefficients with respect to the mean value for the given hour may differ from -16% to +30% for hours of maximum demand.

Źródło:

Journal of Ecological Engineering; 2019, 20, 8; 245-251
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

An analysis of the demand for fresh fruit in Scotland
Analiza popytu na świeże owoce w Szkocji

Autorzy:

Revoredo-Giha, C.
Florkowski, W.J.

Powiązania:

https://bibliotekanauki.pl/articles/867041.pdf

Data publikacji:

2013

Wydawca:

The Polish Association of Agricultural and Agribusiness Economists

Tematy:

demand analysis
fresh fruit
fruit
Scotland
price change
household
United Kingdom
market
demand system

Opis:

The purpose of this study is to analyse the demand for fresh fruits in Scotland in order to provide evidence about their sensitivity to changes in prices and income. Six fresh fruit categories were studied using time series for the period 2006 to 2011: citrus, apples and pears, bananas, grapes, soft fruit, a residual category and other fruits. The series were constructed from a consumer panel that reports weekly purchases by approximately 1300 households and which allowed to construct thirteen periods of four weeks each year. The demand for fruits was modelled using a dynamic version of the Almost Ideal Demand System. Short term and long term conditional elasticities (Marshallian, Hicksian and expenditure) were estimated. The results from the long term elasticities indicated the demand for all the categories were sensitive to changes in prices. Grapes and soft fruits were the most price elastic fruits. In addition, whilst all the expenditure elasticities were positive, the elasticity of citrus was greater than one, apple and pears, bananas and grapes were approximately one and soft fruit and other fresh fruits were less than one.
Badano popyt na świeże owoce w Szkocji w celu określenia zachowań konsumentów względem zmian cen owoców oraz dochodów. Przeanalizowano ceny sześciu grup świeżych owoców w latach 2006-2011: cytrusów, jabłek i gruszek, bananów, winogron, owoców miękkich oraz pozostalycyh. Bazowano na danych dotyczących tygodniowych wydatków około 1300 gospodarstw domowych, dzięki czemu możliwe było stworzenie trzynastu czterotygodniowych przedziałów czasowych dla każdego roku. Popyt na owoce obliczany byl za pomocą dynamicznej wersji Almost Ideał Demand System. Oszacowano krótką i długoterminową elastyczność zależną (Marshallian, Hicksian i wydatki). Wyniki długoterminowej elastyczności wykazały, że popyt zależał od zmian cenowych we wszystkich kategoriach owoców. Winogrona oraz owoce miękkie miały najbardziej elastyczne ceny. Oszacowana elastyczność wydatków była dodatnia i dla cytrusów była większa niż jeden, dla jabłek i gruszek, bananów i winogron wynosiła około jeden, a dla owoców miękkich i pozostałych świeżych owoców była mniejsza niż jeden.

Źródło:

Roczniki Naukowe Stowarzyszenia Ekonomistów Rolnictwa i Agrobiznesu; 2013, 15, 3
1508-3535
2450-7296

Pojawia się w:

Roczniki Naukowe Stowarzyszenia Ekonomistów Rolnictwa i Agrobiznesu

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Wielokryterialna optymalizacja zużycia energii na chłodzenie w budynkach wielkopowierzchniowych
Multiobjective optimization of cooling energy usage in large-floor-area buildings

Autorzy:

Gawin, D.
Woźniak, P.

Powiązania:

https://bibliotekanauki.pl/articles/104646.pdf

Data publikacji:

2017

Wydawca:

Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza

Tematy:

algorytmy genetyczne
Demand-Side Management
Model Predictive Control
precooling
genetic algorithms
demand side management

Opis:

Poszukując optymalnego sposobu eksploatacji budynku, występują trudności w znalezieniu rozwiązania charakteryzującego się jak najmniejszym zużyciem energii, przy jednoczesnym zapewnieniu komfortu cieplnego ludziom w nim przebywającym, ponieważ kryteria te są sobie przeciwstawne. Sprowadza się to do rozwiązania problemu optymalizacji wielokryterialnej i wyznaczenia zbioru punktów optymalnych, stanowiących kombinację danych parametrów wejściowych do symulacji. Do takiej sytuacji dochodzi coraz częściej w okresie letnim, gdy temperatura operatywna w budynku na skutek działania wysokich wartości temperatur powietrza zewnętrznego i natężenia promieniowania słonecznego, przekracza dopuszczalne normy. Powszechnie stosowane instalacje chłodzenia w budynkach użyteczności publicznej powinny więc zostać poddane optymalizacji, zarówno na etapie projektowania, jak i eksploatacji, polegającej na doborze parametrów określających ich działanie. W niniejszym artykule pokazano zastosowanie algorytmów genetycznych do powyższego zagadnienia optymalizacji wielokryterialnej dla przypadku sklepu wielkopowierzchniowego, zakładając dostępność do prognozowanych danych pogodowych z wyprzedzeniem 24-godzinnym. Dodatkowo, harmonogramy pracy instalacji chłodzenia zostały dobrane w sposób uwzględniający zarządzanie stroną popytową w sposób minimalizujący pobieranie energii elektrycznej w okresie największego obciążenia sieci elektroenergetycznej. Z obliczeń otrzymano kombinacje parametrów wejściowych, pozwalających na zmniejszanie kosztów eksploatacyjnych przy zastosowaniu zmiennej taryfy energetycznej, jednocześnie zapewniając komfort termiczny przez cały okres pracy budynku i pobierając energię elektryczną w sposób bardziej równomierny w ciągu doby. Dowodzi to zasadności podjętych badań i możliwości zastosowania powyższej procedury w zarządzaniu rzeczywistych obiektów wielkopowierzchniowych przy użyciu skalibrowanych z nimi modeli komputerowych.
While searching for an optimal way of building exploitation, the difficulty in finding a solution characterized by the lowest energy consumption with simultaneously assuring thermal comfort of the people inside arises. The solution aiming at meeting the two contrary criteria results in application of multi-objective optimization through determining the set of optimal points being a combination of simulation entry parameters. Assuring thermal comfort of the people inside a building is especially inconvenient in summer, when the building’s operative temperature exceeds allowable standards due to influence of high exterior air temperature and solar radiation intensity. Hence, commonly utilized air - conditioning systems should undergo optimization at the stage of both design and during exploitation based on the proper operating parameters choice. This paper analyzes the usage of genetic algorithms in the multi-objective optimization of a large – floor – area store assuming the access to weather conditions forecasted in 24 – hour advance. Furthermore, the HVAC system work schemes were set in a way including the minimization of electrical energy consumption in the peak hours of the power system demand. The performed calculations made it possible to obtain the combination of entry parameters allowing mitigation of exploitation costs through variable electrical energy tariff as well as assuring thermal comfort within the whole building’s operation period while consuming the electrical energy in a more sustainable way. The results prove validity of the undertaken research and possibility of application of the aforementioned procedure in a control system of real large – floor – area buildings, taking advantage of their calibrated computational models.

Źródło:

Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2017, 64, 1; 7-14
2300-5130
2300-8903

Pojawia się w:

Czasopismo Inżynierii Lądowej, Środowiska i Architektury

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

POPYT NA ALKOHOL W POLSCE: WYNIKI ESTYMACJI MODELU QUAIDS
DEMAND FOR ALCOHOL IN POLAND: RESULTS BASED ON QUAIDS MODEL

Autorzy:

Wolak, Jacek

Powiązania:

https://bibliotekanauki.pl/articles/453890.pdf

Data publikacji:

2015

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki

Tematy:

cenowe i dochodowe elastyczności popytu
popyt na alkohol
QUAIDS
demand for alcohol
demand elasticises

Opis:

Artykuł jest poświęcony analizie popytu na napoje alkoholowe w Polsce. Na podstawie danych rocznych, obejmujących lata 1961–2013, przeprowadzono estymację modelu QUAIDS i w konsekwencji otrzymano oszacowania cenowych i dochodowych elastyczności popytu na wyroby spirytusowe, piwo i wino. Uzyskane wskaźniki wskazują na to, że rozważane rodzaje alkoholu są dobrami normalnymi o popycie nieelastycznym.
"This paper is focused on the analysis of demand for alcoholic beverages in Poland. Based on of annual data, covering the period 1961–2013, QUAIDS model was estimated. The obtained estimates of price and income elasticity of demand for spirits, beer and wine suggest that presented types of alcohol are normal goods with inelastic demand. "

Źródło:

Metody Ilościowe w Badaniach Ekonomicznych; 2015, 16, 4; 211-219
2082-792X

Pojawia się w:

Metody Ilościowe w Badaniach Ekonomicznych

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Analiza popytu na kwalifikacje i kompetencje w województwie podlaskim
The Analysis of Demand for Skills and Qualifications in the Podlaskie Province

Autorzy:

Bagieńska, Anna

Powiązania:

https://bibliotekanauki.pl/articles/592154.pdf

Data publikacji:

2013

Wydawca:

Uniwersytet Ekonomiczny w Katowicach

Tematy:

Kwalifikacje pracowników
Popyt na pracę
Popyt na pracowników
Demand for workers
Labour demand
Qualifying employees

Opis:

The success in contemporary economy relies on the company's competitiveness, its fast development and the implementing of new technologies. The development of a knowledge-based economy requires appropriate human resources. Economic growth necessitates the enhancement of the quality of human capital through training, continuing education and the development of employees. The objective of this chapter is to highlight the demand for jobs, skills and competencies in the Podlaskie province, through the analysis in terms of jobs required by employers of qualifications and competences, and analyze the causes of the mismatch of supply, particularly among university graduates. Job analysis has emerged a list of key competencies, personality traits, the formal and additional courses. Quantitative research conducted in a group of employers pointed to the missing graduates of various fields of study skills. They show that the greatest "weakness" of graduates is the lack of practice, which can be reduced only by a larger number of practices and student internships.

Źródło:

Studia Ekonomiczne; 2013, 134; 31-40
2083-8611

Pojawia się w:

Studia Ekonomiczne

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Influence of the Demand Planning Process on Logistic System Reliability. Case Study

Autorzy:

Szozda, Natalia
Werbińska-Wojciechowska, Sylwia

Powiązania:

https://bibliotekanauki.pl/articles/504072.pdf

Data publikacji:

2011

Wydawca:

Międzynarodowa Wyższa Szkoła Logistyki i Transportu

Tematy:

demand planning process
reliability
logistic system

Opis:

Authors define the main elements affecting the right logistic system performance level and investigate the possible connections between demand process planning quality and logistic system reliability. Thus, known in the literature definitions of logistic system reliability are characterized. Later, an overview of some recent developments in the analyzed research area is provided. In the next point, authors present the main elements affecting the reliable and available logistic system performance. Finally, the paper is ended by the presentation of the obtained analysis results in comparison with the knowledge about the case companies’ present condition.

Źródło:

Logistics and Transport; 2011, 13, 2; 79-92
1734-2015

Pojawia się w:

Logistics and Transport

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Międzynarodowa konkurencyjność sieci popytu - innowacje poprzez cloud computing

Autorzy:

Nowicka, Katarzyna

Powiązania:

https://bibliotekanauki.pl/articles/630417.pdf

Data publikacji:

2017

Wydawca:

Szkoła Główna Handlowa w Warszawie

Tematy:

Demand, Cloud computing, Innovations, Supply chain

Opis:

In today's economy supply chains are frequently transforming into international demand networks. Cloud computing is the answer to the main challenges posed by creation and management of flexible and adaptive global demand networks. Cloud computing is a tool that forms a link between technology and business, and thus innovatively improves competitiveness of international supply chains while supporting development of individual economic entities regardless of their size and scale of activities. Cloud computing is the basis for the development of the economy of sharing, mass customization, social networks, systems infrastructure and communications of individual companies and those of international supply chains. The article presents the possibilities of using cloud computing in supporting development of innovation in management of international demand networks. The article elaborates on whether cloud computing is an innovation, or rather just a tool to introduce innovations and what is the extent of the impact of its use on the level of innovation in international demand networks

Źródło:

Kwartalnik Kolegium Ekonomiczno-Społecznego Studia i Prace; 2017, 4; 135-150
2082-0976

Pojawia się w:

Kwartalnik Kolegium Ekonomiczno-Społecznego Studia i Prace

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

Zautomatyzowane zarządzanie zapotrzebowaniem w ogniwach sieci dystrybucyjnej - studium przypadku
Automated demand management in the cells of the distribution network - case study

Autorzy:

Milewska, E.

Powiązania:

https://bibliotekanauki.pl/articles/325893.pdf

Data publikacji:

2015

Wydawca:

Politechnika Śląska. Wydawnictwo Politechniki Śląskiej

Tematy:

dystrybucja
prognozowanie
popyt
distribution
forecasting
demand

Opis:

Artykuł przedstawia zagadnienie prognozowania popytu w ogniwach sieci dystrybucyjnej przeprowadzanego na podstawie archiwalnych danych dokumentów sprzedaży wybranej firmy. Celem analizy była budowa rozwiązania umożliwiającego zautomatyzowanie procesu identyfikacji popytu w punktach sprzedaży detalicznej oraz usprawnienie organizacji procesu dostaw przez wykorzystanie narzędzia informatycznego wspomagającego kompletację ładunków zaopatrzenia towarowego.
The paper presents the problem of forecasting the demand in the cells of the distribution network carried out on the basis of archival data chosen company sales documents. The aim of the analysis was to build a solution to automate the identification of demand in retail stores and streamlining the organization of the supply through the use of IT tools supporting the completion of the supply of goods.

Źródło:

Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2015, 80; 189-201
1641-3466

Pojawia się w:

Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

Determinants of tourism demand in Greece: a panel data approach

Autorzy:

Agiomirgianakis, George M.
Sfakianakis, George

Powiązania:

https://bibliotekanauki.pl/articles/425243.pdf

Data publikacji:

2014

Wydawca:

Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu

Tematy:

tourism demand
panel data
macroeconometric approach

Opis:

This paper aims at investigating the determinants of tourism demand in Greece over eight years (2004-2011). Tourism is the main industry of Greece as its share in the Greek economy varies from 15% to 20% of GDP whether measured directly or indirectly respectively. We opted for a macroeconometric approach and, in particular, building on the existing literature we used panel data estimation techniques with disaggregated data on the country (or area) of origin combined with macroeconomic aggregates, indicators and (relative) price indices. The specific econometric techniques used take into account both the statistical properties of variables and the differences between the various cross sections. The main conclusion of the paper is that the macroeconometric panel data approach to explaining tourist receipts provides a rather satisfactory model fit, with explanatory variables explaining a significant part of the variability of the dependent variable. Our findings also suggest that certain policy directions identified by Greek governments (both in the present and past), such as enhancing competitiveness and the outward orientation of the economy, may indeed affect positively the prospects of the Greek tourism sector.

Źródło:

Econometrics. Ekonometria. Advances in Applied Data Analytics; 2014, 1(43); 15-26
1507-3866

Pojawia się w:

Econometrics. Ekonometria. Advances in Applied Data Analytics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

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

/5

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Skocz do pozycji: 31.

Tytuł:

Regression model of water demand for the city of Lodz as a function of atmospheric factors

Autorzy:

Domański, Czesław
Kubacki, Robert

Powiązania:

https://bibliotekanauki.pl/articles/2107156.pdf

Data publikacji:

2022-06-14

Wydawca:

Główny Urząd Statystyczny

Tematy:

water demand
atmospheric factors
regression model

Opis:

One of the Sustainable Development Goals (Goal 6) set by the United Nations is to provide people with access to water and sanitation through sustainable water resources management. Water supply companies carrying out tasks commissioned by local authorities ensure there is an optimal amount of water in the water supply system. The aim of this study is to present the results of the work on a statistical model which determined the influence of individual atmospheric factors on the demand for water in the city of Lodz, Poland, in 2010-2019. In order to build the model, the study used data from the Water Supply and Sewage System Company (Zakład Wodociągów i Kanalizacji Sp. z o.o.) in the city of Lodz complemented with data on weather conditions in the studied period. The analysis showed that the constructed models make it possible to perform a forecast of water demand depending on the expected weather conditions.

Źródło:

Statistics in Transition new series; 2022, 23, 2; 153-161
1234-7655

Pojawia się w:

Statistics in Transition new series

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

DEMAND FORECAST WITH BUSINESS CLIMATE INDEX FOR A STEEL AND IRON INDUSTRY REPRESENTATIVE

Autorzy:

Barska, Magdalena

Powiązania:

https://bibliotekanauki.pl/articles/453455.pdf

Data publikacji:

2014

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki

Tematy:

demand forecasting
SARIMAX
business climate indicator

Opis:

The steel and iron industry production is dedicated to serve other industries mainly. This makes the exercise of demand forecasting different than for consumer goods. The common sense says that demand fluctuations are influenced by general economic soundness. An attempt was made to address the question of improving forecast’s accuracy by adding a business cycle indicator as an input variable. The SARIMAX model was applied. Including a business climate indicator improved model’s performance, however no co integration is observed between the two series.

Źródło:

Metody Ilościowe w Badaniach Ekonomicznych; 2014, 15, 2; 27-36
2082-792X

Pojawia się w:

Metody Ilościowe w Badaniach Ekonomicznych

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Influence of a season on hourly and daily variations in water demand patterns in a rural water supply line – case study
Ocena wpływu pory roku na zmienność dobowego i godzinowego zapotrzebowania na wodę w wodociągu wiejskim – studium przypadku

Autorzy:

Bergel, T.
Szeląg, B.
Woyciechowska, O.

Powiązania:

https://bibliotekanauki.pl/articles/292293.pdf

Data publikacji:

2017

Wydawca:

Instytut Technologiczno-Przyrodniczy

Tematy:

amount and irregularities demand
municipal water supply system
water demand
water demand peaks
szczyty poboru wody
wartość i nierównomierność zapotrzebowania
wodociągi wiejskie
zapotrzebowanie na wodę

Opis:

This article presents the results of a study on hourly and daily variations in water demand patterns, depending on a season. The study was conducted in the years 2014–2015 on a selected rural water supply line. The analysis was based on values of hourly water demand as measured by a water meter coupled with a recording device. The research showed that both the volume and fluctuations in daily water demand were higher in the spring and the summer, versus the autumn and the winter. This was most probably caused by water consumption for additional purposes, specific for rural areas. Individual water demand was the highest in the summer, and the lowest in the winter. Two peaks for hourly water demand were determined for the analyzed seasons. The morning peak always occurred at 7 a.m. on working days, while on days off work it fell at 9 a.m. or 10 a.m., depending on the season. The evening peak always fell at 8 p.m., regardless of a season or a day of a week. On working days, the evening peak was always higher than the morning one, while on days off work the morning peak was higher than the evening one in the autumn and in the winter, and both peaks were the same in the spring and in the summer.
W artykule przedstawiono analizę wyników badań zmienności dobowego i godzinowego zapotrzebowania na wodę w wybranym wodociągu wiejskim. Wykonano ją dla dni tygodnia i pór roku w latach 2014–2015. Podstawą do przeprowadzenia analizy były wartości godzinowego zapotrzebowania na wodę zmierzone za pomocą wodomierza współpracującego z rejestratorem zamontowanego na przewodzie odpływowym z początkowego zbiornika sieciowego. Przeprowadzone badania wykazały, że wartość i nierównomierność dobowego zapotrzebowania na wodę była większa wiosną i latem niż jesienią i zimą. Najbardziej prawdopodobną przyczyną takiego stanu było występowanie celów dodatkowych zużycia wody, charakterystycznych dla terenów wiejskich. Jednostkowe zapotrzebowanie na wodę największe wartości przyjmowało latem, a najmniejsze zimą. W analizowanych porach roku stwierdzono występowanie dwóch szczytów godzinowego zapotrzebowania na wodę. W dni powszednie szczyt poranny przypadał zawsze na godzinę 7, natomiast w dni wolne od pracy, w zależności od pory roku, na godzinę 9 lub 10. Z kolei bez względu na porę roku i dzień tygodnia szczyt wieczorny przypadał zawsze na godzinę 20. W dni powszednie szczyt wieczorny był zawsze większy od szczytu porannego, natomiast w dni wolne od pracy zimą i jesienią szczyt poranny był większy od wieczornego, a latem i wiosną wartości szczytowe były takie same.

Źródło:

Journal of Water and Land Development; 2017, 34; 59-64
1429-7426
2083-4535

Pojawia się w:

Journal of Water and Land Development

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

The Evaluation of the Demand for Services Provided by Travel Guides and Tour Leaders

Autorzy:

Kruczek, Zygmunt
Mazanek, Leszek
Czulińska-Bukowska, Anna

Powiązania:

https://bibliotekanauki.pl/articles/1391063.pdf

Data publikacji:

2019

Wydawca:

Wyższa Szkoła Bankowa w Poznaniu

Tematy:

travel guides
tour leaders
services
demand

Opis:

This article presents the results of empirical research on the labour market of city travel guides, regional guides and mountain guides as well as tour leaders. The aim of this article is to evaluate the demand for the services of travel guides and tour leaders. The study included tourism entrepreneurs and the method of a diagnostic survey with the use of computer-assisted telephone interviewing (CATI) was applied. The obtained results confirmed the thesis that the labour market of travel guides and tour leaders is not stable and this is due to the seasonality, level of earnings and changing model of travel organization. The study also showed that in the five-year period from the deregulation of the professions, the market relations between travel guides and tour leaders on the one hand and tourism entrepreneurs on the other did not undergo fundamental changes. The results of the study may be useful for tour operators, organisations associating travel guides and tour leaders as well as for tourism administration at the central and regional level.

Źródło:

Studia Periegetica; 2019, 28(4); 57-72
1897-9262
2658-1736

Pojawia się w:

Studia Periegetica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Surogatka is already a cliché occupation, whether social demand

Autorzy:

Antoni, Olak,
Antoni, Krauz,

Powiązania:

https://bibliotekanauki.pl/articles/891406.pdf

Data publikacji:

2018-08-17

Wydawca:

Wyższa Szkoła Bezpieczeństwa Publicznego i Indywidualnego Apeiron w Krakowie

Tematy:

Surrogate
mother
children
profession
social demand

Opis:

In given article a brief characterization of the issue as new surrogates calculates the surrogate mother. The survey was carried out, the analysis of the phenomenon on the basis of the available literature, online content of legal documents. Shows trends, reviews, as well as societal demands in terms of the needs and the new role of the use of surrogate mothers in the in vitro.

Źródło:

Kultura Bezpieczeństwa. Nauka – Praktyka – Refleksje; 2016, 21; 179-192
2299-4033

Pojawia się w:

Kultura Bezpieczeństwa. Nauka – Praktyka – Refleksje

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Artificial Intelligence Methods in Spare Parts Demand Forecasting

Autorzy:

Rosienkiewicz, Maria

Powiązania:

https://bibliotekanauki.pl/articles/504136.pdf

Data publikacji:

2013

Wydawca:

Międzynarodowa Wyższa Szkoła Logistyki i Transportu

Tematy:

lumpy demand
forecasting
ANN
Artificial Intelligence

Opis:

The paper discusses the problem of forecasting lumpy demand which is typical for spare parts. Several prediction methods are presented in the article – traditional techniques based on time series and advanced methods that use Artificial Intelligence tools. The research conducted in the paper focuses on comparison of eight forecasting methods, including classical, hybrid and based on artificial neural networks. The aim of the paper is to assess the efficiency of lumpy demand forecasting methods that apply AI tools. The assessment is conducted by a comparison with traditional methods and it is based on Root Mean Square Errors (RMSE) and relative forecast errors (ex post) values. The article presents also a new approach to the lumpy demand forecasting issue – a method which combines regression modelling, information criteria and artificial neural networks.

Źródło:

Logistics and Transport; 2013, 18, 2; 41-50
1734-2015

Pojawia się w:

Logistics and Transport

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

Simulation Methods Application for LPG Deliveries Planning and Scheduling to the Network of Stations Under Demand Uncertainty

Autorzy:

Karkuła, Marek
Kaleta, Jacek

Powiązania:

https://bibliotekanauki.pl/articles/504144.pdf

Data publikacji:

2017

Wydawca:

Międzynarodowa Wyższa Szkoła Logistyki i Transportu

Tematy:

VMI
VRP
IRP
DES
variable demand

Opis:

In our paper we considered the problem of demand uncertainty and its influence on planning and scheduling of LPG deliveries. The experience of specialized transportation company in charge of LPG deliveries for the domestic supplier network under VMI approach was analyzed. High variability of distribution parameters and frequent orders modifications were observed while small stations tanks capacities comparing to high daily LPG sales volumes were considered. The combined use of simulation and optimization methods was proposed for the case of LPG distribution to the petrol stations network. The demand uncertainty at customers' stations was considered. Simulation models were assumed to be efficient for dynamic and robust delivery plans of LPG distribution. The results of computational experiments were presented for different values of coefficient of variation.

Źródło:

Logistics and Transport; 2017, 34, 2; 63-78
1734-2015

Pojawia się w:

Logistics and Transport

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Wpływ popytu na akcje notowane na Giełdzie Papierów Wartościowych w Warszawie na płynność rynku
The Influence of the Demand for Warsaw Stock Exchange-Listed Shares on the Market’s Liquidity

Autorzy:

Nawrot, Wioletta

Powiązania:

https://bibliotekanauki.pl/articles/575659.pdf

Data publikacji:

2006-08-31

Wydawca:

Szkoła Główna Handlowa w Warszawie. Kolegium Analiz Ekonomicznych

Tematy:

shares
demand
stock exchange
liquidity
market

Opis:

The author analyzes the demand for shares and attempts to determine its influence on the liquidity of the Warsaw Stock Exchange. The analysis was conducted by calculating and bringing together values of key importance to the liquidity of the market and investment activity on the Polish stock market. The analysis showed that the liquidity of the Polish stock market decreased in the analyzed period (1995-2005). First, there was a drop in the value of stock trades in relation to the market’s capitalization. Subsequently, there was a problem involving the substantial concentration of trade on the exchange. On the basis of this situation, attempts were made to check the demand side of the stock market, especially in the institutional investor segment. Analyses conducted by the author indicate that, as a result of a dynamic increase in pension and investment fund assets in 2000-2005, these institutions substantially increased the value of shares in their possession, withdrawing some of the stock from “active” turnover. Over the next few years, more than 40% of the assets invested by these institutions in stock were tied up in the portfolios of open-ended pension funds. However, in the years that followed, assets held by institutional investors were subject to decreased turnover. This seems to indicate that institutional investors could pose a threat to the market’s liquidity by channeling substantial assets to the domestic stock market in a situation in which the supply of shares was insufficient. However, a supplementary examination of the average turnover in WSE-listed shares, particularly those making up the market’s free float, revealed that the activity of institutional investors, though decreasing with each passing year, was several times higher than average investment activity on the stock market. In other words, transactions made by institutional investors were the key driving force behind the market’s liquidity in the analyzed period. Unfortunately, the positive influence of institutional investors decreased in 2003-2005, a period that saw a major increase in pension and investment fund assets. The insufficient-and continually decreasing-liquidity of the stock market, coupled with the dynamic development of the institutional investor segment, particularly pension funds, justifies worries over the liquidity and stable development of the Polish stock market.

Źródło:

Gospodarka Narodowa. The Polish Journal of Economics; 2006, 209, 7-8; 59-81
2300-5238

Pojawia się w:

Gospodarka Narodowa. The Polish Journal of Economics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Popyt jako instrument kształtowania porządku świata
Crisis of the essence of capitalism

Autorzy:

Piontek, Barbara

Powiązania:

https://bibliotekanauki.pl/articles/465315.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Komitet Prognoz Polska 2000 Plus PAN

Tematy:

gospodarka postindustrialna
popyt
postindustrial economy
demand

Opis:

Wraz z przejściem od gospodarki industrialnej do gospodarki postindustrialnej, większość z istniejących wcześniej barier gospodarczych straciło na znaczeniu. Dotyczy to w szczególności popytu, który może stać się narzędziem budowania ładu i urządzania świata, pod warunkiem rozbudowy różnych metod jego kształtowania. Ważna jest przy tym w szczególności kategoria popytu ciągnionego.
The change from industrial to postindustrial economy abolished many barriers functioning before. This concerns in particular demand that can become a tool shaping the order of the world provided it will be appropriately shaped itself. Especially important in that is the category of demand pull.

Źródło:

Przyszłość. Świat-Europa-Polska; 2013, 2; 52-57
1895-0949

Pojawia się w:

Przyszłość. Świat-Europa-Polska

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Estimation of inter-city travel demand for public road transport in Nigeria

Autorzy:

Dike, D. N.
Ibe, C. C.
Ejem, A. E.
Erumaka, O.
Chukwu, O. E.

Powiązania:

https://bibliotekanauki.pl/articles/2140965.pdf

Data publikacji:

2018

Wydawca:

Fundacja Centrum Badań Socjologicznych

Tematy:

inter-city
demand
transport
elasticities
passenger

Opis:

This research develops an urban travel demand model for 19 directional O-D city-pair from Owerri Urban. Using revealed preference data from the period of 2014 to 2016 operated by sixteen transport companies in Owerri, Imo State. Other empirical findings include that; overall fares elasticities are low, so that increases in fare levels will almost always lead to increases in revenue. An empirical model to assess the viability of intercity passenger transport operation in Nigeria was formulated. This study will help the operators in business to do a sensitivity analysis based of changes in the intercity passenger travel markets in Nigeria.

Źródło:

Journal of Sustainable Development of Transport and Logistics; 2018, 3, 3; 88-98
2520-2979

Pojawia się w:

Journal of Sustainable Development of Transport and Logistics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Psychosocial work dimensions, personality, and body mass index: Sex differences

Autorzy:

Blanch, Angel
Aluja, Anton

Powiązania:

https://bibliotekanauki.pl/articles/2179131.pdf

Data publikacji:

2013-08-01

Wydawca:

Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi

Tematy:

BMI
work demand and control
personality

Opis:

Objectives: The association between psychosocial work dimensions (i.e. demand and control) and obesity has been found to be inconclusive, indicating that individual differences factors might also contribute to explain the variability in BMI. Materials and Methods: The interaction between work dimensions and personality variables in a group of male and female workers (N = 506), and its associations with BMI were analyzed with a cross-sectional study with self-report data. Hierarhical regression analyses were used to predict the BMI levels from work and individual differences variables and their interactions for males and females. Results: The main effects of personality variables were not significant, physical workload interacted with neuroticism for males, whereas control interacted with activity for females. Conclusions: Psychosocial work dimensions and personality traits were related to BMI for men and women. These outcomes reinforce the notion that different models might account for the explanatory mechanisms of BMI in regard to sex.

Źródło:

International Journal of Occupational Medicine and Environmental Health; 2013, 26, 4; 572-580
1232-1087
1896-494X

Pojawia się w:

International Journal of Occupational Medicine and Environmental Health

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Annual Variation in the Performance of Settat Wastewater Stabilization Ponds Located in Settat City, Morocco

Autorzy:

Dyaa, Abou-Tammame
Jihane, Fathi
Abdelhamid, Bouzidi

Powiązania:

https://bibliotekanauki.pl/articles/1955490.pdf

Data publikacji:

2021

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

wastewater
natural lagoon
biochemical oxygen demand
chemical oxygen demand
suspended solids
sewage treatment
wastewater reuse
agriculture

Opis:

The wastewater treatment plant of Settat city uses the natural lagooning technology, which requires low maintenance cost and little technical expertise. The purpose of this study was to evaluate the stability of plant performance during two years of operation (2019 and 2020), as well as the safety of its treated wastewater for reuse in agricultural irrigation. The results of this study show that the biochemical oxygen demand (BOD5), chemical oxygen demand (COD) and suspended solids (SS) did not exceed the Moroccan standards for discharge. They also show a good stable pollutant load reduction with a mean of 86.44%, 86.89% and 74.61%, for BOD5, COD and SS, respectively. On the other hand, microbiological characterization classifies the treated wastewater as "B" quality water, because the fecal coliform numbers exceed the requirement for "A" quality (1000 CFU/100 ml).

Źródło:

Journal of Ecological Engineering; 2021, 22, 8; 153-164
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Predictive Modelling for Characterisation of Organics in Pit Latrine Sludge from Unplanned Settlements in Cities of Malawi

Autorzy:

Kalulu, K.
Thole, B.
Mkandawire, T.
Kululanga, G.

Powiązania:

https://bibliotekanauki.pl/articles/124540.pdf

Data publikacji:

2018

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

Akaike Information Criterion
biochemical oxygen demand
chemical oxygen demand
faecal sludge characteristics
multiple linear regression model

Opis:

The limited availability of data on faecal sludge characteristics remains one of the major challenges faced by developing countries in proper management of faecal sludge. In view of the limited financial resources and expertise in these developing countries, there is a need to come up with less-resource-intensive approaches for faecal sludge characterisation. Despite being used substantially in wastewater, there is limited evidence on the use of predictive modelling as a tool for cost-effective characterisation of faecal sludge. In this study, first order multiple linear regression modelling is investigated as a less-resource-intensive approach for accurate prediction of organics (biochemical oxygen demand and chemical oxygen demand) in pit latrine sludge. The predictor variables explored in the modelling include pH, electrical conductivity, total solids, total volatile solids, fixed solids and moisture content. The modelling uses data collected from 80 latrines in unplanned settlements of four cities in Malawi. The study shows that it is possible to reliably predict chemical oxygen demand and biochemical oxygen demand in pit latrine sludge using electrical conductivity and total solids, which require low levels of resources and expertise to determine.

Źródło:

Journal of Ecological Engineering; 2018, 19, 3; 141-145
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

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

/5

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Skocz do pozycji: 45.

Tytuł:

Impact of demand characteristics on the profitability of a purchasing strategy

Autorzy:

Milewski, Dariusz

Powiązania:

https://bibliotekanauki.pl/articles/2033613.pdf

Data publikacji:

2021

Wydawca:

Akademia Morska w Szczecinie. Wydawnictwo AMSz

Tematy:

demand characteristics
distribution of demand
economic efficiency of logistic processes
purchasing strategies
selection of transport modes
simulation

Opis:

The problem presented in this article concerns the impact of demand characteristics for consumer goods on the profitability of purchasing strategy, including the choice of both the source of supply and transport technology (deliveries in containers by sea, rail, air, and road transport). To assess the profitability of applying a specific strategy, the author developed a model to conduct simulations using the Monte Carlo approach for two demand distributions (Gaussian and Gamma), various sales fluctuations, and changes in demand during the delivery time. Calculations were carried out considering the costs of transport, storage, capital costs related to maintaining stocks, and costs of lost sales. The simulation results show that the greater the fluctuations and the lower the predictability of the demand, the greater the profitability of deliveries using air transport and local deliveries. However, concrete decisions depend on knowledge of the consequences of making these decisions and whether appropriate cost accounting is used in enterprises. The results of the calculations also indicate that the strategy of outsourcing production in low-cost countries will, in many cases, become unprofitable if production costs in these countries increase even slightly.

Źródło:

Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2021, 67 (139); 70-79
1733-8670
2392-0378

Pojawia się w:

Zeszyty Naukowe Akademii Morskiej w Szczecinie

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

The Analysis of the Amount of Pollutants in Wastewater after Mechanical Treatment in the Aspect of their Susceptibility to Biodegradation in the Treatment Plant in Nowy Targ

Autorzy:

Nowobilska-Majewska, Elwira
Bugajski, Piotr

Powiązania:

https://bibliotekanauki.pl/articles/123918.pdf

Data publikacji:

2019

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

wastewater
biodegradability
mechanical treatment
BOD5
COD
chemical oxygen demand
biochemical oxygen demand
total nitrogen
total phosphorus

Opis:

The aim of this study was to determine the biodegradability of organic and biogenic contaminants in wastewater flowing into biological reactors in the treatment plant in Nowy Targ. The research period covered the years 2016 and 2017, when 87 samples of raw wastewater and 87 samples of wastewater after mechanical treatment were collected and subjected to physico-chemical analysis. In both types of wastewater, the size of the following indicators was analyzed: BOD₅, COD, total kjeldahl nitrogen (TN) and total phosphorus (TP). The study verified the amount of pollutants in the raw wastewater in order to determine whether they are household wastewater. In the next stage of the analysis, the characteristic values of the analyzed indicators in wastewater after the mechanical treatment process were determined in order to indicate mutual dependences of organic and biogenic indicators. Based on the analysis, it was found that wastewater after mechanical treatment (in the case of its susceptibility to biological decomposition processes of organic pollutants) has an unfavorable COD/BOD₅ ratio. With regard to the susceptibility of wastewater to nitrification, denitrification and dephosphatation processes, in the majority of cases, wastewater is susceptible to these processes. It is recommended to apply an additional source of organic carbon to wastewater prior to biological treatment in order to improve the biodegradation of the analyzed pollutants.

Źródło:

Journal of Ecological Engineering; 2019, 20, 8; 135-143
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Consumer-oriented heat consumption prediction

Autorzy:

Grzenda, M.

Powiązania:

https://bibliotekanauki.pl/articles/206248.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Instytut Badań Systemowych PAN

Tematy:

district heating systems
demand prediction
neural networks

Opis:

The advent of modern low-cost monitoring and wireless transmission systems results in unprecedented availability of measurement data potentially available in near real-time mode. In particular, some of the remote meter reading systems can be used to collect data on an hourly or even sub-hourly basis. This allows the utility companies to model and predict consumer behaviour more precisely than before. In this study, the way the monitoring data can be used to model heat consumption at individual premises supplied with heat by a district heating system, is proposed. The proposed algorithm is based on customer partitioning used to devise a number of group models serving the needs of consumers sharing similar consumption profiles. Self-organising maps are used to group averaged long-term time series, while the short-term time series provide a basis for group prediction models. Particular attention has been paid to a wider hydraulic modelling perspective, as the application of the proposed method to provide assumed demand for hydraulic model of a district heating system is envisaged. The approach has been validated using a real data set. Results show that in spite of a limited number of monitored consumers, group prediction models, constructed using the algorithm proposed in this study, can significantly reduce demand prediction error.

Źródło:

Control and Cybernetics; 2012, 41, 1; 213-240
0324-8569

Pojawia się w:

Control and Cybernetics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Analysis of the methods for gas demand forecasting

Autorzy:

Apostol, R.
Łaciak, M.
Oliinyk, A.
Szurlej, A.

Powiązania:

https://bibliotekanauki.pl/articles/298637.pdf

Data publikacji:

2017

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

natural gas
gas consumption
gas demand forecasting

Opis:

Natural gas is a very important and strategic resource. In the structure of the world’s primary energy, its share is currently approx. 25 and according to the forecasts it will continue to grow. In addition, the transition the large cities to gas as the main energy resource is an effective solution for reducing harmful emissions and improving air quality. The trend of increasing consumption of natural gas causes the complex technical issues, especially the need of accurate forecasting the gas demand, design the new distribution networks and modernization of the existing systems of gas supply. This article presents a review of existing methods for gas demand forecasting based on the gas engineering literature analysis and the approach for the forecasting of gas consumption based on the analysis of the gas consumption diagrams of gas station.

Źródło:

AGH Drilling, Oil, Gas; 2017, 34, 2; 429-438
2299-4157
2300-7052

Pojawia się w:

AGH Drilling, Oil, Gas

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Logistics management based on demand forecasting

Autorzy:

Hart, M.
Lukoszová, X.
Kubíková, J.

Powiązania:

https://bibliotekanauki.pl/articles/409312.pdf

Data publikacji:

2013

Wydawca:

Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej

Tematy:

logistics management
demand forecasting
supply chain
industry

Opis:

The companies of any industry are strongly affected with current globalization trend, which makes supply chain flows more and more bulky and complex. To be competitive in cost and eco-friend way under contemporary business market conditions, the companies should apply system approach of logistics management to plan, manage and control of their logistics processes. Each company’s system can be analysed and divided into essential logistics sub-systems: purchasing, production, packaging, warehousing, distribution and reverse material flow management. Thus, the system and process approach are crucial for up-to-date logistics systems or subsystems management in context of long-term sustainable growth. Any effective logistics management system should be based on sub-system of demand forecasting. Demand forecasting is increasingly getting important to make right managerial decisions. Well developed demand forecasting sub-sytem in a company is a ground for effective planning, management and control of all company’s processes then also for effective logistics or supply chain management.

Źródło:

Research in Logistics & Production; 2013, 3, 1; 71-80
2083-4942
2083-4950

Pojawia się w:

Research in Logistics & Production

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 50.

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

/5

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