Temat: model sieci - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The concept of a logistics centre model as a nodal point of a transport and logistics network
Koncepcja modelu centrum logistycznego jako węzłowego punktu sieci transportowo-logistycznej
Autorzy:: Krzyżaniak, S.
Hajdul, M.
Fechner, I.
Powiązania:: https://bibliotekanauki.pl/articles/224171.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: sieci transportowo-logistyczne
centrum logistyczne
infrastruktura
logistics centre model
transport network
logistics network
Opis:: The paper presents a concept of a logistics centre model. The model is based on defined output/input flows of goods. Therefore it is possible to determine and estimate the load of elements of the centre infrastructure being at the disposal of individual service providers operating within the centre. Input and output flows are defined on the basis of the balance of flows directed to the centre from the whole logistics and transport network and are considered split into: product groups, types of transport, various transport forms of cargo. The seasonal nature of these flows has been taken into consideration. The calculations of infrastructure load assume that every service provider operating within the centre can also use elements of infrastructure owned by other centre users. The proposed model can serve various purposes. An emphasis is put herein on the possibility of estimating the degree of the transport and logistics infrastructure load of the centre on the basis of historical data as well as on the basis of forecasts. As a result, the needs related to the access to the infrastructure can be specified and used to determine and verify investment plans.
W referacie przedstawiono koncepcję modelu centrum logistycznego, pozwalającego - w oparciu o zdefiniowane dane o strumieniach wejścia i wyjścia - na określenie i ocenę stopnia obciążenia elementów infrastruktury centrum, będącej w dyspozycji poszczególnych usługodawców działających na jego terenie. Strumienie wejścia i wyjścia są definiowane na podstawie bilansu strumieni kierowanych do centrum z całej sieci logistyczno- transportowej i są rozpatrywane w podziale na: grupy towarowe, rodzaje transportu, różne postaci transportowe ładunków. Uwzględniona została sezonowość tych strumieni. W obliczeniach obciążeń infrastruktury przyjęto możliwość wykorzystywania przez każdego z usługodawców działających na terenie centrum także elementów infrastruktury należących do innych użytkowników centrum. Zaproponowany model może służyć różnym celom. W niniejszym artykule położono nacisk na możliwość szacowania stopnia obciążenia infrastruktury transportowo- logistycznej centrum, na podstawie danych historycznych, ale także w oparciu o prognozy. Pozwoli to na określenie potrzeb związanych z dostępem do infrastruktury i może zostać wykorzystane do ustalania i weryfikacji planów inwestycyjnych.
Źródło:: Archives of Transport; 2012, 24, 2; 165-186
0866-9546
2300-8830
Pojawia się w:: Archives of Transport
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 2.

Tytuł:: Using the Petri nets for forming the technological lines of the passenger trains processing in Ukraine
Autorzy:: Aleshinskiy, E.
Naumov, V.
Prymachenko, G.
Powiązania:: https://bibliotekanauki.pl/articles/224307.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: passenger complexes
passenger technical station
Petri nets
simulation model
technological line
pociągi pasażerskie
sieci Petriego
model symulacyjny
linia technologiczna
Opis:: Despite the large number of publications, which authors use the mathematical apparatus of Petri nets for the transportation systems studies, there are still no such researches of technological processing lines for passenger trains on the territory of passenger complexes that aim to improve trains processing technology. In this article, we present simulation models of technological processing lines for passenger trains of different categories developed with the use of Petri nets. The structure of proposed simulation models is based on real time parallel-operating objects. Such an approach allows maximizing similarity of developed models and the simulated objects; in this way we achieve the increased adequacy of the obtained models. The article presents an interface of developed models and examples of their functioning under conditions of different input parameters, as well as the results of their use in order to reduce the passenger trains processing time. The proposed models are generic and could be applied for simulation of passenger trains processing at any station of Ukraine.
Źródło:: Archives of Transport; 2016, 38, 2; 7-15
0866-9546
2300-8830
Pojawia się w:: Archives of Transport
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 3.

Tytuł:: Development of models to study traffic accidents on the final sections of access roads to the cities: a case study of three major Iranian cities
Autorzy:: Fallah Tafti, Mehdi
Roshani, Reza
Powiązania:: https://bibliotekanauki.pl/articles/1955155.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: traffic accidents
city access roads
entrance roads
traffic safety
accident prediction model
neural networks
wypadki drogowe
drogi dojazdowe do miasta
drogi wjazdowe
bezpieczeństwo na drodze
modele przewidywania wypadków
sieci neuronowe
Opis:: The final sections of main access roads to the cities require especial attention as the frequency of accidents in these road sections are considerably higher than other parts of interurban roads. These road sections operate as an interface between the rural roads and urban streets. The previous researches available on this subject are limited and they have also mainly focused on a narrow range of factors contributing to the accidents in these areas. The main contribution of this research is to consider a relatively comprehensive range of potential factors , and to examine their impacts through the development and comparison of both conventional probabilistic models and Artificial Neural Network (ANN) models. For this purpose, information related to the main access roads of three major Iranian cities were collected. This information consisted of accident frequency data together with the field observations of traffic characteristics, roadway conditions and roadside features of these roads. Various ANN and probabilistic models were developed. The frequency of accidents, i.e. fatal, injured, or damaged accidents, was considered as the output of the developed models. The results indicated that a hybrid of ANN models, each comprised of 10 input variables representing traffic, roadway and roadside conditions, outperformed several probabilistic models, i.e. Poisson, Negative binomial, Zero-truncated Poisson, and Zero-truncated Negative Binomial models, also developed under similar conditions in this study. Moreover, effective roadway width, roadway lighting condition, the standard deviation of vehicles speed, percentage of drivers violating the speed limit, average annual daily traffic, percentage of heavy goods vehicles, the density of roadside commercial and industrial land uses, the density of median U-turns, the density of local access roads, and the effective width of the left-side shoulder were identified as the most effective factors contributing to the accidents in these areas. The developed ANN model can be used as a tool to predict accident rates in these road sections, and to estimate a potential reduction in the accident rates, following any improvements in the major factors contributing to the traffic accidents in these areas.
Źródło:: Archives of Transport; 2021, 59, 3; 129-148
0866-9546
2300-8830
Pojawia się w:: Archives of Transport
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Informacja

Wyszukujesz frazę "model sieci" wg kryterium: Temat

Źródło danych

Dostawca treści

Kolekcja

Rok wydania

Wydawca

Temat

Autor

Typ dokumentu

Język