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    Wyświetlanie 1-5 z 5
    Tytuł:
    Implementation of gravity model to estimation of transportation market shares
    Obszary przewagi konkurencyjnej na rynku usług transportowych
    Autorzy:
    Krata, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/224208.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    usługi transportowe
    transport
    konkurencyjność
    przedsiębiorstwo transportowe
    algorytm optymalizacji
    transport market
    competitiveness
    transport enterprises
    optimization algorithm
    Opis:
    The theoretical consideration presented in the paper is inspired by market gravity models, as an interesting attitude towards operations research on a market. The transportation market issues are emphasized. The mathematical model of relations, taking place between transportation companies and their customers on the market, which is applied in the course of the research is based on continuous functions characteristics. This attitude enables the use of the field theory notions. The resultant vector-type utility function facilitates obtaining of competitive advantage areas for all transportation companies located on the considered transportation market.
    Prezentowane dociekania teoretyczne inspirowane są teorią grawitacji rynkowej, jako interesującym elementem badań rynkowych. Rozważaniom poddano rynek usług transportowych. Zastosowany został model relacji zachodzących pomiędzy przedsiębiorstwami transportowymi i ich klientami na rynku usług transportowych, wykorzystujący do opisu cech przedsiębiorstw i klientów funkcje ciągłe o charakterze lokalnym. Umożliwiło to aplikację wybranych elementów matematycznej teorii pola. Wykorzystana wektorowa funkcja użyteczności posłużyła do wyznaczania obszarów przewagi konkurencyjnej poszczególnych przedsiębiorstw transportowych na rynku usług transportowych, przy zastosowaniu zaproponowanego algorytmu optymalizacyjnego.
    Źródło:
    Archives of Transport; 2010, 22, 1; 83-96
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanisms for increasing of transportation efficiency using joint service of logistics systems
    Autorzy:
    Galkin, Andrii
    Powiązania:
    https://bibliotekanauki.pl/articles/223648.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    transportation services
    material flows
    investments
    present value
    synergists
    usługi transportowe
    przepływy materiałów
    inwestycje
    wartość bieżąca
    Opis:
    More and more attention become to Transport Company’s functioning efficiency due to growing of goods’ nomenclature and specific requirements for their service. Existing scientific and practical approaches to managing of transportation process consider separate service of each contract individually. Up-today requirements for transportation services complicate such evaluation. These requirements primarily include transportation frequency and volumes variation in each logistics system due to seasonal consumption of material flows. Different seasonality leads to irrational use of vehicles and decrees of their efficiency. All this gives rise to the mechanism of compatible transportation service of numerous logistics systems and their material flows by any enterprise. The paper consist of next sections the analysis of scientific framework and methods on the transportation services, fleet estimation, efficiency evaluations, analysis of requirements of transportation services; Mechanism of joint transportation services; Modelling of transportation services in logistics systems, where joint efficiency estimation of transportation functioning and logistics system and conclusions. The proposed methods and tools in the complex allow to identify and evaluate the effectiveness of the joint motor transport service of logistic systems by own and hired vehicles compared to the separate on the basis of performance indicators, which vary depending on the technological parameters: transport distances, runway usage factor, cargo class, load capacity of motor vehicles . The offered approach will reveal: regularities of change of indicators of efficiency of variants of the joint motor transport service between the traditional approach (a separate calculation of efficiency for each logistics system) and the proposed (calculation of compatible services), which allows to determine the equivalent cost of transport services during motor transport maintenance of material flows. The calculations confirm the effect of use compared to the separate combined transportation of material flows, which will be shown in reducing the required amount of vehicles by 31,8% and increasing efficiency from 5% to 60%, depending on the initial values of the transportation services parameters. The results of the project can be used in the formation of a freight vehicle fleet of any enterprise that is faced with the issue of hiring transport or have its own, PL providers, transport companies, and others.
    Źródło:
    Archives of Transport; 2019, 49, 1; 7-24
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vehicle routing problem with partly simultane-ous pickup and delivery for the cluster of small and medium enterprises
    Autorzy:
    He, P.
    Li, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/224095.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    transportation service
    pickup
    delivery
    small and medium enterprises
    usługi transportowe
    odbiór
    dostawa
    małe i średnie przedsiębiorstwa
    Opis:
    The transportation service for the cluster of small and medium enterprises (SMEs) is different with traditional vehicle routing problems. In the cluster of SMEs, parts of enterprises are pickup and delivery spots simultaneously, but some enterprises are partly pickup and delivery simultaneously. It is necessary to optimize this transportation service with an effective mathematics and algorithm to reduce transportation costs for manufacturers. However, traditional mathematics models and algorithms are not suitable to solve the vehicle routing problem partly simultaneous pickup and delivery (VRPPSD) because these items mainly focus on the vehicle routing problem with pickup and delivery simultaneously. In this paper, a mathematics operational model is proposed to analyze the transportation service of the cluster companies and to describe transportation processes. A hybrid algorithm which is composed by tabu search, genetic algorithm and local search is used to optimize the operational model. The crossover and mutation contained by genetic algorithm are used to generate neighborhood solutions for tabu search, and the local search is used to improve optimizing solutions. The data of a cluster of SMEs, investigating from Changzhou city, China, are employed to show the validity of our mathematical model and algorithm. The results indicate that our model and hybrid algorithm is effective to solve VRPPSD. In this paper, the satisfied solutions of VRPPSD are found by hybrid algorithm. At the same time, the results also show that carriers with optimal routs can service customers with more profits (increasing 5.6%). The potential saving of transport cost will increase profits of carriers in SMEs. Sensitivity analyses about adjusting service time and rate of new orders are lunched to analyze how these two factors influence the profits of the VRPPSPD in a dynamic case. A bottleneck that influences the profits is found, and there has a shorter service time which could increase gross profits, but not significantly.
    Źródło:
    Archives of Transport; 2018, 45, 1; 35-42
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exploring on-demand service use in large urban areas: the case of Rome
    Autorzy:
    Nuzzolo, Agostino
    Comi, Antonio
    Polimeni, Antonio
    Powiązania:
    https://bibliotekanauki.pl/articles/223789.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    transport services
    demand analysis
    dial a taxi
    exploitation costs
    public transport
    usługi transportowe
    analiza popytu
    wybór taksówki
    koszty eksploatacji
    transport publiczny
    Opis:
    Traditional and innovative on-demand transport services, such as taxi, car sharing or dial-a-ride respectively, can provide a level of flexibility to the public transport with the aim to guarantee a better service and to reduce the exploitation costs. In this context, in order to point out the key-factors of on-demand services, this study focuses on traditional on-demand service (such as taxi one), and presents the results of a demand analysis and modelling, obtained processing taxi floating car data (FCD) available for the city of Rome. The GPS position of each taxi is logged every few seconds and it was possible to build a monthly database of historical GPS traces through around 27 thousands of GPS positions recorded per day (more than 750 thousands for the entire month). Further, the patterns of within-day and day-to-day service demand are investigated, considering the origin, the destination and other characteristics of the trips (e.g. travel time). The time-based requests for taxi service were obtained and used to analyse the trip distribution in space and on time. These analyses allow us to forecast trips generated/attracted by each zone within the cities according to land use characteristics and time slices. Therefore, a regression tree analysis was developed and different regressive model specifications with different set of attributes (e.g. number of subway stations, number of zonal employees, population) were tested in order to assess their contribution on describing such a service use.
    Źródło:
    Archives of Transport; 2019, 50, 2; 77-90
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimizations of network layout and transport service frequencies in view of interests of transit line operators and utilizers
    Autorzy:
    Zhu, Xiaojing
    Feng, Xuesong
    Zhang, Lukai
    Hua, Weixin
    Powiązania:
    https://bibliotekanauki.pl/articles/223857.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    transit network layout design
    transportation service
    service optimization
    interests of transit line operators
    interests of utilizers
    simulated annealing algorithm
    genetic algorithm
    projekt układu sieci transportowej
    usługi transportowe
    optymalizacja usług
    interesy operatorów linii tranzytowych
    interes użytkowników
    algorytm genetyczny
    Opis:
    Layouts of bus networks in cities are always irrational currently, transport service frequencies also need to be optimized according to the real network layouts, operation conditions and travel experience of passengers, so it is essential to optimize bus transit network layouts and transport service frequencies systematically. Different stakeholders are involved in the optimization of urban bus transit network layouts like the government, operators and passengers, whose interests are always contradictory. In order to optimize transit network layout and service frequencies from the view point of operators and utilizers, this research constructs a multi-objective model and proposes a solution algorithm. The proposed multi-objective model is established from the perspective of operators with the goal of minimizing total operating costs for one day, and from the perspective of the utilizers to minimize the total travel time, respectively. Also with the application of electric bus in cities, buses in this research are electric buses all for green travel. Moreover, a solution algorithm is proposed in this research to solve the proposed multi-objective model with simulated annealing algorithm and genetic algorithm. Simulated annealing algorithm is used as the main framework of the solution algorithm from the perspective of operators to minimize operating costs, while genetic algorithm is used as the subroutine of simulated annealing algorithm to optimize total travel time. Verification of the proposed model and the solution algorithm is based on an intuitive network. The application results of a numerical experiment verified that the proposed optimization model and the solution algorithm are able to optimize the network layout and service frequencies at the same time.
    Źródło:
    Archives of Transport; 2019, 50, 2; 47-55
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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