scholarly journals Research Methodology: Application of Railway Luggage and Package Transportation Scheme Formulation Based on a Dynamic Time–Space Service Network

Symmetry ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1226 ◽  
Author(s):  
Niu ◽  
Liu ◽  
Wang
Keyword(s):  
Flow Distribution ◽  
Distribution Model ◽  
A Algorithm ◽  
Service Network ◽  
Dynamic Changes ◽  
Transport Organization ◽  
Time Space ◽  
Total Profit ◽  
Feasible Path ◽  
Dynamic Time

In the current market environment, the formulation of a railway luggage and package transport scheme (RLPTS) is often affected by the specific requirements of the transport organization, the complex composition of the transport service network, and the dynamic changes of transport demands, which make it very difficult. In this paper, a two-stage RLPTS formulation method is proposed that can meet not only transport demands with dynamic changes, but also the requirements of transport timeliness. It is used to solve the problem of current RLPTS formulation. First, a dynamic service network for railway luggage and package transport (RLPT) is constructed based on passenger train schedules, and based on this network, an improved A* algorithm is designed to generate feasible path sets for RLPT demand. Then, based on feasible path sets, a flow distribution model aiming at maximizing the total profit of transportation is established to solve the model in order to enable the flow allocated on the path. Finally, an example calculation shows that the method can implement the RLPTS formulation rapidly.

scholarly journals A Time-Space Network Model Based on a Train Diagram for Predicting and Controlling the Traffic Congestion in a Station Caused by an Emergency

Symmetry ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 780 ◽  
Author(s):  
Zihan Qu ◽  
Shiwei He
Keyword(s):  
Network Model ◽  
Traffic Congestion ◽  
Flow Distribution ◽  
Distribution Model ◽  
A Algorithm ◽  
Traffic Forecasting ◽  
Space Network ◽  
Model Based ◽  
Time Space ◽  
Feasible Path

Timely predicting and controlling the traffic congestion in a station caused by an emergency is an important task in railway emergency management. However, traffic forecasting in an emergency is subject to a dynamic service network, with uncertainty surrounding elements such as the capacity of the transport network, schedules, and plans. Accurate traffic forecasting is difficult. This paper proposes a practical time-space network model based on a train diagram for predicting and controlling the traffic congestion in a station caused by an emergency. Based on the train diagram, we constructed a symmetric time-space network for the first time by considering the transition of the railcar state. On this basis, an improved A* algorithm based on the railcar flow route was proposed to generate feasible path sets and a dynamic railcar flow distribution model was built to simulate the railcar flow distribution process in an emergency. In our numerical studies, these output results of our proposed model can be used to control traffic congestion.

scholarly journals Highway Passenger Transport Based Express Parcel Service Network Design: Model and Algorithm

2017 ◽  
Vol 2017 ◽  
pp. 1-17 ◽  
Author(s):  
Yuan Jiang ◽  
Baofeng Sun ◽  
Gendao Li ◽  
Zhibin Lin ◽  
Changxu Zheng ◽  
...  
Keyword(s):  
Network Design ◽  
Network Flow ◽  
Programming Model ◽  
Real Data ◽  
Path Selection ◽  
Network Design Problem ◽  
Mixed Integer ◽  
Passenger Transport ◽  
Service Network ◽  
Time Space

Highway passenger transport based express parcel service (HPTB-EPS) is an emerging business that uses unutilised room of coach trunk to ship parcels between major cities. While it is reaping more and more express market, the managers are facing difficult decisions to design the service network. This paper investigates the HPTB-EPS network design problem and analyses the time-space characteristics of such network. A mixed-integer programming model is formulated integrating the service decision, frequency, and network flow distribution. To solve the model, a decomposition-based heuristic algorithm is designed by decomposing the problem as three steps: construction of service network, service path selection, and distribution of network flow. Numerical experiment using real data from our partner company demonstrates the effectiveness of our model and algorithm. We found that our solution could reduce the total cost by up to 16.3% compared to the carrier’s solution. The sensitivity analysis demonstrates the robustness and flexibility of the solutions of the model.

Research on the Influence of Furnace Structure on Copper Cooling Stave Life

2019 ◽  
Vol 38 (2019) ◽  
pp. 1-7
Author(s):  
Feng-guang Li ◽  
Jian-liang Zhang
Keyword(s):  
Service Life ◽  
Flow Velocity ◽  
Gas Flow ◽  
Flow Distribution ◽  
Distribution Model ◽  
Variational Structure ◽  
Shaft Angle ◽  
The Stability ◽  
Gas Flow Velocity ◽  
Copper Stave

AbstractIn this paper, a blast furnace gas flow distribution model with variable furnace structure was founded based on CFD (computational fluid dynamics) theory, and the gas velocity distribution near the surface of the copper staves in different areas of the BF is calculated under different conditions of variational structure parameters like Bosh angle, shaft angle, and the newly proposed “equivalent Bosh angle.” Based on the calculation, the influence rule of the BF structure on the service life of copper stave and the corresponding operation measures were obtained. The result shows that the increase of the Bosh angle and the decrease of the shaft angle will incur increasing of the gas flow velocity near the surface of the copper staves, which is harmful to the cooling stave life; the variation of the equivalent Bosh angle has a most significant influence on the cooling stave life, and the increase of the equivalent Bosh angle will cause a sharp increase of the gas flow velocity, which will damage the copper staves seriously; adopting long tuyeres and minishing the equivalent Bosh angle will reduce the washing action of the gas flow and ensure the stability of slag hanging to achieve a long service life of copper staves.

scholarly journals Analysis of dynamic changes in ECG signals during optical mapping by dynamic time warping

2005 ◽  
Author(s):  
M. Vyklicky ◽  
J. Bardonova ◽  
I. Provaznik ◽  
M. Novakova ◽  
M. Blaha ◽  
...  
Keyword(s):  
Dynamic Time Warping ◽  
Optical Mapping ◽  
Time Warping ◽  
Dynamic Changes ◽  
Ecg Signals ◽  
Dynamic Time

scholarly journals Mining disposal erosion evaluation: A case study

2021 ◽  
Vol 882 (1) ◽  
pp. 012050
Author(s):  
Y S Novianti ◽  
U Saismana ◽  
Y Yuhanes ◽  
H N Fikri
Keyword(s):  
Land Cover ◽  
Soil Loss ◽  
Flow Distribution ◽  
Mining Activity ◽  
Distribution Model ◽  
Mining Activities ◽  
The Third ◽  
Soil Loss Equation ◽  
Reclamation Process

Abstract Mining disposal (dumping overburden) area is the primary consideration in the reclamation process in mining activities, especially in mining activity. The current study aims to determine the rate of erosion and the level of erosion hazard at mine disposal using water flow distribution. This research was conducted in a coal mine in Kalimantan. Based on the structure of the runoff flow distribution model, this study divides disposal into three land units. The universal soil loss equation in three land units was obtained for erosion values. The value for each land unit is 76 tons/ha/year, 134 tons/ha/year, and 50 tons/ha/year. These three land units are under the level of moderate and light danger of erosion. Afterward, three recommendations were made to the three land units. The first recommendation is the condition of land cover does not change, and conservation changes; the second recommendation is with changes in land cover, but conservation does not change; and the third recommendation is with conditions of land cover and conservation change. The second recommendation shows the best results compared to the other recommendations.

scholarly journals Modeling and Simulation of Passenger Flow Distribution in Urban Rail Transit Hub Platform

2016 ◽  
Author(s):  
Long Gao ◽  
Limin Jia
Keyword(s):  
Modeling And Simulation ◽  
Superposition Principle ◽  
Flow Distribution ◽  
Service Level ◽  
Urban Rail Transit ◽  
Distribution Model ◽  
Rail Transit ◽  
Simulation Design ◽  
Passenger Flow ◽  
Urban Rail

Urban rail transit hub platform is the most important area for passenger flow distribution. In order to calculate passenger flow volume in platform and evaluate platform service level during rush hours, this paper presents a method for modeling and simulation of passenger flow distribution in platform. Passenger flow distribution model (PFDM) is proposed based on the basic analysis and the superposition principle of passenger flow. Simulation design for PFDM is proposed by Anylogic, which contains simulation process and simulation model. Experiment results show that PFDM and simulation design are effective and accordant with the reality scenario, and the simulation precision is comparatively ideal. This research could provide a beneficial reference for train scheduling and operation management under the viewpoint of traffic safety and service level.

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