Crowd evacuation model based on bacterial foraging algorithm

2018 ◽  
Vol 29 (03) ◽  
pp. 1850027 ◽  
Author(s):  
Mu Shibiao ◽  
Chen Zhijun
Keyword(s):  
Cellular Automata ◽  
Simulation Experiments ◽  
Evacuation Time ◽  
Pedestrian Movement ◽  
Model Based ◽  
Bacterial Foraging ◽  
Optimization Function ◽  
Crowd Evacuation ◽  
Bacterial Foraging Algorithm ◽  
The Relationship

To understand crowd evacuation, a model based on a bacterial foraging algorithm (BFA) is proposed in this paper. Considering dynamic and static factors, the probability of pedestrian movement is established using cellular automata. In addition, given walking and queue times, a target optimization function is built. At the same time, a BFA is used to optimize the objective function. Finally, through real and simulation experiments, the relationship between the parameters of evacuation time, exit width, pedestrian density, and average evacuation speed is analyzed. The results show that the model can effectively describe a real evacuation.

Microsimulation Assignment Model for Multidirectional Pedestrian Movement in Congested Facilities

2005 ◽  
Vol 1939 (1) ◽  
pp. 123-132 ◽  
Author(s):  
Ahmed Abdelghany ◽  
Khaled Abdelghany ◽  
Hani S. Mahmassani ◽  
Saad A. Al-Gadhi
Keyword(s):  
Saudi Arabia ◽  
Cellular Automata ◽  
Discrete System ◽  
Pedestrian Behavior ◽  
Simulation Experiments ◽  
Pedestrian Movement ◽  
Pedestrian Dynamics ◽  
Operational Conditions ◽  
Assignment Model

Frequent pedestrian casualties in crowded facilities have brought increasing attention to the study of pedestrian dynamics in such facilities. In this paper, a microsimulation assignment model for multidirectional pedestrian movement in crowds is presented. The model attempts to overcome many limitations of existing models by incorporating various pedestrian behavior rules under a particular set of situations. It also adopts a cellular automata discrete system that allows detailed representation of pedestrians’ walkways and movement areas. The model is applied to the “mataf” system, which is located at the main prayer hall of the holy noble mosque known as Al-Haram Al-Shareef Mosque in Mecca, Saudi Arabia. A set of simulation experiments is designed to illustrate use of the model to study the performance of the mataf system by consideration of different operational conditions as well as different pilgrim behavior rules.

scholarly journals Pedestrian Movement Model based on Voronoi Cellular Automata

2014 ◽  
Vol 2 ◽  
pp. 336-343 ◽  
Author(s):  
Hisamoto Hiyoshi ◽  
Yukari Tanioka ◽  
Toshiki Hamamoto ◽  
Kazuya Matsumoto ◽  
Kaito Chiba
Keyword(s):  
Cellular Automata ◽  
Movement Model ◽  
Pedestrian Movement ◽  
Model Based

A new underwater positioning model based on average sound speed

2021 ◽  
pp. 1-17
Author(s):  
Yixu Liu ◽  
Xiushan Lu ◽  
Shuqiang Xue ◽  
Shengli Wang
Keyword(s):  
Efficient Algorithm ◽  
Sound Speed ◽  
Incident Angle ◽  
Function Model ◽  
Positioning Accuracy ◽  
Correction Model ◽  
Model Based ◽  
Underwater Positioning ◽  
Speed Function ◽  
The Relationship

Abstract The layout of seafloor datum points is the key to constructing the seafloor geodetic datum network, and a reliable underwater positioning model is the prerequisite for achieving precise deployment of the datum points. The traditional average sound speed positioning model is generally adopted in underwater positioning due to its simple and efficient algorithm, but it is sensitive to incident angle related errors, which lead to unreliable positioning results. Based on the relationship between incident angle and sound speed, the sound speed function model considering the incident angle has been established. Results show that the accuracy of positioning is easily affected by errors related to the incident angle; the new average sound speed correction model based on the incident angle proposed in this paper is used to significantly improve the underwater positioning accuracy.

scholarly journals Using Computer Simulation Method to Improve Throughput of Production Systems by Buffers and Workers Allocation

2015 ◽  
Vol 6 (4) ◽  
pp. 60-69 ◽  
Author(s):  
Sławomir Kłos ◽  
Peter Trebuna
Keyword(s):  
Computer Simulation ◽  
Production System ◽  
Production Systems ◽  
Simulation Method ◽  
System Throughput ◽  
Buffer Allocation ◽  
Simulation Experiments ◽  
Buffer Capacities ◽  
The Relationship ◽  
Support Decision Making

Abstract This paper proposes the application of computer simulation methods to support decision making regarding intermediate buffer allocations in a series-parallel production line. The simulation model of the production system is based on a real example of a manufacturing company working in the automotive industry. Simulation experiments were conducted for different allocations of buffer capacities and different numbers of employees. The production system consists of three technological operations with intermediate buffers between each operation. The technological operations are carried out using machines and every machine can be operated by one worker. Multi-work in the production system is available (one operator operates several machines). On the basis of the simulation experiments, the relationship between system throughput, buffer allocation and the number of employees is analyzed. Increasing the buffer capacity results in an increase in the average product lifespan. Therefore, in the article a new index is proposed that includes the throughput of the manufacturing system and product life span. Simulation experiments were performed for different configurations of technological operations.

Competing Explanations of Split-ticket Voting in American National Elections

2000 ◽  
Vol 28 (3) ◽  
pp. 379-407 ◽  
Author(s):  
FRANCO MATTEI ◽  
JOHN S. HOWES
Keyword(s):  
Small Group ◽  
National Elections ◽  
Congressional Voting ◽  
Party Polarization ◽  
Model Based ◽  
Alternative Approach ◽  
Candidate Evaluations ◽  
Electoral Expectations ◽  
The Relationship

In this article, the authors propose an extension to Fiorina's balancing model based on voters' electoral expectations and test this extension and several implications of the theory. The authors examine the observed pattern of ticket-splitting and find it less consistent with a balancing perspective than with an alternative approach stressing separation between presidential and congressional voting. They also address the relationship between party polarization and ticket-splitting; their results indicate that the occurrence of split ballots does not increase with polarization. A further test identifies respondents with both the sophistication and the motive to engage in balancing behavior. According to this analysis, balancing considerations influence, at most, the very small group of voters whose sophistication and electoral expectations give them the tools and the incentive to pursue balance with a split ballot. Ticket-splitting appears to result far more from incumbency and cross-pressured voters holding candidate evaluations at odds with their partisan learnings.

Pedestrian evacuation behavior analysis and simulation in multi-exits case

2017 ◽  
Vol 28 (10) ◽  
pp. 1750128 ◽  
Author(s):  
Yongxing Li ◽  
Hongfei Jia ◽  
Jun Li ◽  
Jian Gong ◽  
Kechao Sun
Keyword(s):  
Cellular Automata ◽  
Choice Model ◽  
Current Position ◽  
Time Model ◽  
Evacuation Time ◽  
Pedestrian Evacuation ◽  
Shortest Distance ◽  
Evacuation Behavior ◽  
Exit Choice ◽  
Pedestrian Simulation

Considering the process of pedestrian evacuation as pedestrian walking freely from current position to exit and queuing at the exit, estimated evacuation time model for single pedestrian is established. Based on estimated evacuation time and shortest distance, pedestrian exit choice model is established considering pedestrian preference. Pedestrian exit choice model is added into pedestrian simulation model which is built based on cellular automata. Pedestrian evacuation behavior in multi-exits case is simulated. The simulations indicate that pedestrian evacuation model built in our work describes the pedestrian evacuation behavior well.

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