PEDESTRIAN DYNAMICS IN A TWO-DIMENSIONAL COMPLEX SCENARIO USING A LOCAL VIEW FLOOR FIELD MODEL

2011 ◽  
Vol 22 (08) ◽  
pp. 775-803 ◽  
Author(s):  
JIA-BEI ZENG ◽  
BIAO LENG ◽  
ZHANG XIONG ◽  
ZHENG QIN
Keyword(s):  
Traffic Management ◽  
Convex Polygon ◽  
Field Model ◽  
Two Dimensional ◽  
Pedestrian Dynamics ◽  
Initial Decision ◽  
Global View ◽  
Local View ◽  
Floor Field ◽  
Complex Scenario

In this paper, an extended FF model (floor field model) to simulate pedestrian dynamics in complex scenarios is proposed. Considering that pedestrians are unaware of the global view of traffic path, we introduce pedestrians' local views and propose a framework to change a pedestrian's static floor field each time they enter a new convex area. A pedestrian's view is limited to a convex polygon. When they travel from one convex area to another, they make decisions about the next goal according to the distances between them and the candidate goals, as well as densities of capacity and herding behaviors. Meanwhile, after making an initial decision about the next goal, a pedestrian can estimate the travel time to reach each visible goal and change their path adaptively within the convex area. Simulations in two scenarios are conducted and the results show that pedestrians under local views behave more practically than those under global views in complex scenarios. Parameter settings are also discussed along with suggestions that can be given to designers for improving traffic management.

scholarly journals Research on the Effects of Heterogeneity on Pedestrian Dynamics in Walkway of Subway Station

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Haoling Wu ◽  
Zhenzhou Yuan ◽  
Huixuan Li ◽  
Junfang Tian
Keyword(s):  
Walking Speed ◽  
Field Model ◽  
Subway Station ◽  
Major Objective ◽  
Pedestrian Dynamics ◽  
Proposed Model ◽  
Negative Effect ◽  
Floor Field ◽  
Subway Stations ◽  
Positive Effect

The major objective of this paper is to study the effects of heterogeneity on pedestrian dynamics in walkway of subway station. We analyze the observed data of the selected facility and find that walking speed and occupied space were varied in the population. In reality, pedestrians are heterogeneous individuals with different attributes. However, the research on how the heterogeneity affects the pedestrian dynamics in facilities of subway stations is insufficient. The improved floor field model is therefore presented to explore the effects of heterogeneity. Pedestrians are classified into pedestrians walking in pairs, fast pedestrians, and ordinary pedestrians. For convenience, they are denoted asP-pedestrians,F-pedestrians, andO-pedestrians, respectively. The proposed model is validated under homogeneous and heterogeneous conditions. Three pedestrian compositions are simulated to analyze the effects of heterogeneity on pedestrian dynamics. The results show thatP-pedestrians have negative effect andF-pedestrians have positive effect. All of the results in this paper indicate that the capacity of walkway is not a constant value. It changes with different component proportions of heterogeneous pedestrians. The heterogeneity of pedestrian has an important influence on the pedestrian dynamics in the walkway of the subway station.

scholarly journals Floor Field Model Based on Cellular Automata for Simulating Indoor Pedestrian Evacuation

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Xiao Yang ◽  
Binxu Wang ◽  
Zheng Qin
Keyword(s):  
Cellular Automata ◽  
Field Experiments ◽  
Field Model ◽  
Field Method ◽  
Research Centre ◽  
Model Parameters ◽  
Field Approach ◽  
Pedestrian Evacuation ◽  
Floor Field ◽  
Complex Scenario

A new static floor field method for simulations of evacuation processes based on cellular automaton was presented in this paper. This model applies an inertia static floor field approach to describe the interaction between the pedestrians and the cell. Here we study a rather simple situation and a complex scenario. We simulate and reproduce Seyfried’s field experiments at the Research Centre Jülich and use its empirical data to validate our model. The concept of scenario-familiarity of the crowd has been proposed to explain the model. It is shown that the variation of the model parameters deeply impacts the evacuation efficiency. The relation between minimal evacuation times and the knowledge of the exit that the pedestrian acknowledges is discussed.

OUT FLOW IN A VIRTUAL MTR STATION USING A LOCAL VIEW FLOOR FIELD MODEL

2013 ◽  
Vol 24 (06) ◽  
pp. 1350037 ◽  
Author(s):  
BIAO LENG ◽  
JIANYUAN WANG ◽  
XIAOXI ZHAO ◽  
JUN FANG ◽  
ZHANG XIONG
Keyword(s):  
Detailed Analysis ◽  
Field Model ◽  
Flow Dynamics ◽  
Pedestrian Flow ◽  
Priority List ◽  
Dynamic Priority ◽  
Local View ◽  
Simulation Scenario ◽  
Floor Field

The floor field (FF) model, up until now, has been the most widely used simulation in pedestrian flow dynamics for simple based scenarios. This paper presents an improvement on and upon the local view FF model by simulating pedestrian flow in more complex scenarios with typical goals and obstacles that may block or assist the sight of the pedestrian. In addition this model will also provide a detailed analysis entailing the simulation of multi-goal selections. This involves the visibility information on each cell being set, and a dynamic priority list of goals for every pedestrian being updated as he/she moves. The pedestrians select the convenient goal according to the priority of goals, the distances to the candidate goals and the degree of congestion. To aid in the theory of this and to make a better understanding of reality, a simulation scenario is conducted on a virtual MTR station, where parameter settings are discussed and some regular phenomena helpful to the designers of stations is put forward.

A New Floor Field Model for Pedestrian Evacuation Considering Local Density

2014 ◽  
Vol 505-506 ◽  
pp. 1172-1178
Author(s):  
Sheng Nan Li ◽  
Xin Gang Li
Keyword(s):  
Potential Field ◽  
Field Model ◽  
Local Density ◽  
Density Parameter ◽  
Evacuation Time ◽  
Pedestrian Dynamics ◽  
Pedestrian Evacuation ◽  
A Cell ◽  
Floor Field ◽  
Simulation Results

The behavior of pedestrians around the corner of a room or a corridor is one of the most important features in pedestrian evacuating dynamics. In order to study this in detail, an existing potential field model is modified to capture the pedestrian dynamic around corner by introducing a local density parameter. The local density parameter of a cell is defined as the pedestrian occupancy of the surrounding eight neighbors. Simulations are carried out to study pedestrian evacuation in rooms with corners formed by internal obstacles and walls. The simulation results show that the new model can reproduce the empirical pedestrian dynamics around corner. Pedestrians prefer to walk to lower pedestrian density area although the route may be a little longer. It is also shown that the total evacuation time could be reduced for the evacuation corridor is fully utilized.

Conserved dynamics of a two-dimensional random-field model

1993 ◽  
Vol 48 (1) ◽  
pp. R25-R28 ◽  
Author(s):  
Madan Rao ◽  
Amitabha Chakrabarti
Keyword(s):  
Random Field ◽  
Field Model ◽  
Two Dimensional ◽  
Random Field Model

scholarly journals A Sampling of the Yeast Proteome

1999 ◽  
Vol 19 (11) ◽  
pp. 7357-7368 ◽  
Author(s):  
B. Futcher ◽  
G. I. Latter ◽  
P. Monardo ◽  
C. S. McLaughlin ◽  
J. I. Garrels
Keyword(s):  
Gel Electrophoresis ◽  
Protein Turnover ◽  
Codon Bias ◽  
Quantitative Information ◽  
Protein Abundance ◽  
2D Gel Electrophoresis ◽  
Two Dimensional ◽  
Yeast Proteome ◽  
Global View ◽  
2D Gel

ABSTRACT In this study, we examined yeast proteins by two-dimensional (2D) gel electrophoresis and gathered quantitative information from about 1,400 spots. We found that there is an enormous range of protein abundance and, for identified spots, a good correlation between protein abundance, mRNA abundance, and codon bias. For each molecule of well-translated mRNA, there were about 4,000 molecules of protein. The relative abundance of proteins was measured in glucose and ethanol media. Protein turnover was examined and found to be insignificant for abundant proteins. Some phosphoproteins were identified. The behavior of proteins in differential centrifugation experiments was examined. Such experiments with 2D gels can give a global view of the yeast proteome.

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