Variation of Drivers' Visual Features in Long-Tunnel Entrance Section on Expressway

2011 ◽  
Vol 3 (1) ◽  
pp. 27-37 ◽  
Author(s):  
Haoxue Liu ◽  
Guangming Ding ◽  
Weihua Zhao ◽  
Hui Wang ◽  
Kaizheng Liu ◽  
...  
Keyword(s):  
Visual Features ◽  
Entrance Section ◽  
Tunnel Entrance

scholarly journals Design and implementation of LED lighting intelligent control system for expressway tunnel entrance based on Internet of things and fuzzy control

2020 ◽  
Vol 16 (5) ◽  
pp. 155014772092574
Author(s):  
Ying Lu ◽  
Jin Wang ◽  
Xiaojun Bai ◽  
Hehan Wang
Keyword(s):  
Control System ◽  
Internet Of Things ◽  
Fuzzy Control ◽  
Traffic Flow ◽  
Intelligent Control ◽  
Flow Speed ◽  
Led Lighting ◽  
Intelligent Control System ◽  
Entrance Section ◽  
Tunnel Entrance

Due to the special characteristics of highway tunnels and vehicles, the interior of the tunnel is required to provide appropriate lighting to ensure the safety of driving vehicles, especially at the entrance section of the tunnel. At present, most of the tunnel entrance lighting control system only considers one single factor, the brightness outside the tunnel. However, in practice, the required lighting brightness in the tunnel is also related to traffic flow, speed, and other factors. Comprehensively utilizing these factors to improve the control strategy is urgently needed. To deal with this problem, this article has designed a multi-source information acquisition system for tunnel lighting based on the Internet of things technology, which combined with fuzzy control theory in order to develop an intelligent control system for LED lighting at the entrance section of the tunnel. The designed system was implemented and long-term tested in a real highway tunnel. The experimental results have shown that the system designed in this article can automatically control the brightness of the lighting inside the tunnel according to the real-time measurements of the brightness outside the tunnel, traffic flow, speed, and so on. Furthermore, the utilizations of the system can minimize the human and power consumption of tunnel lighting while ensuring the safety of tunnel traffic.

scholarly journals Drivers in Expressway Superlong Tunnels: The Change Patterns of Visual Features and the Discriminant Model of Driving Safety

2019 ◽  
Vol 3 (3) ◽  
pp. p240
Author(s):  
Ling WU ◽  
Weihua ZHAO ◽  
Tong ZHU ◽  
Haoxue LIU
Keyword(s):  
Pupil Size ◽  
Driving Safety ◽  
Visual Features ◽  
Exit Section ◽  
Discriminant Model ◽  
The Gaze ◽  
Entrance Section ◽  
Tunnel Section ◽  
C4.5 Decision Tree ◽  
Tracking Devices

A real-vehicle experiment was carried out in the superlong highway tunnel environment to study the change patterns of driver’s visual features, tracked by eye tracking devices, and the discriminant model of driver’s safety status. On the basis of statistical analysis, a single index and a comprehensive index discriminant model, both based on a C4.5 decision tree, were established. The results showed that compared with the non-tunnel highway sections, the driver’s pupil size was larger, and the gaze duration was longer in the tunnel section. Driver’s pupil size was larger in mid-tunnel section than in the entrance section and exit section. Gazes at the exit section were mainly short gazes. Compared to the exit section, driver’s pupil size changed more dramatically in the entrance section, and the gaze duration was longer. The single visual parameter indicator could clearly discriminate the driver’s safety status in the mid-tunnel section and the non-tunnel sections, while the dual-index-based identification model could clearly discriminate the safety status in each highway sections. The study deepens the research on the driver information perception model in superlong highway tunnels. Also, the study provides a theoretical basis for establishing a visual-feature-based real-time safety status discriminant.

Seismic Analysis of the Entrance Section of a Nuclear Power Intake Tunnel

2014 ◽  
Vol 1065-1069 ◽  
pp. 426-432
Author(s):  
Shi Kui Huang ◽  
Jie Zhao
Keyword(s):  
Nuclear Power ◽  
Large Scale ◽  
Seismic Waves ◽  
Seismic Analysis ◽  
Three Dimensional ◽  
Nonlinear Dynamic Analysis ◽  
Analysis Method ◽  
Response Characteristics ◽  
Entrance Section ◽  
Tunnel Entrance

For a nuclear power intake tunnel project, large-scale three-dimensional finite difference model is established by Flac3D to simulate the seismic response regularity of the entrance section of tunnel under the action of seismic waves schedule with the nonlinear dynamic analysis method. Through the input of the site seismic wave, the structure response characteristics of the tunnel entrance and slope are explored and duration curve of tunnel hole lining force under seismic waves action and tunnel lining figure can be obtained. The analysis results show that the anti-seismic weak parts of the tunnel entrance is at the location of tunnel spandrel and the sidewall. The analysis method and conclusions can be for reference in the seismic design of similar nuclear power intake tunnel project.

Analysis and Design Optimization of Collapse Characteristics of Taojiakuang Tunnel Entrance Section

2019 ◽  
Vol 38 (1) ◽  
pp. 551-560 ◽  
Author(s):  
Ran Li ◽  
Nana Han ◽  
Changfeng Yuan ◽  
Qiuru Chen ◽  
Guangming Yu ◽  
...  
Keyword(s):  
Design Optimization ◽  
Analysis And Design ◽  
Entrance Section ◽  
Collapse Characteristics ◽  
Tunnel Entrance

scholarly journals Study on temperature field of entrance section at high altitude tunnel considering water supply from snowmelt

2021 ◽  
Vol 25 (6 Part B) ◽  
pp. 4597-4604
Author(s):  
Guo-Dong Niu ◽  
Zhi-Qiang Liu ◽  
Ning Li ◽  
Hao-Xuan Zhou ◽  
Gang Yang
Keyword(s):  
Temperature Field ◽  
Water Supply ◽  
High Altitude ◽  
Great Influence ◽  
Side Wall ◽  
Model Tests ◽  
Freezing Injury ◽  
Entrance Section ◽  
Supply Condition ◽  
Tunnel Entrance

To explore the influence of snowmelt supply at the entrance section at high altitude tunnel on tunnel engineering, several indoor model tests were carried out by setting a water-supply system above the model device for simulating the actual snowmelt supply environment. The model tests were based on a project at high altitude tunnel in Qinghai. The varied characteristics of temperature field in typical cross-sections of tunnel entrances with and without water-supply condition under freeze-thaw cycles were analyzed accurately by the model. This study shows that the external water supply has a great influence on the tunnel entrance. When the surrounding rock freezes at the tunnel entrance, it first freezes from the arch, then develops to the side wall, and then spreads to the inverted arch to form a freezing circle. The faster the freezing development rate is, the greater the thickness of the freezing ring is under the water-supply condition. The development of temperature field under water-supply condition is obviously faster than that under normal condition. The distribution characteristics of freezing depth in both conditions are the arch is the largest, the side wall is the second, and the inverted arch is the smallest. This study can provide a reference for analyzing the process of freezing injury caused by high altitude snowmelt water supply into tunnel entrances in western Sichuan.

Reduced change blindness for task-relevant visual features during a social interaction

2001 ◽  
Author(s):  
Donald A. Varakin ◽  
Sheena Rogers ◽  
Jeffrey T. Andre ◽  
Susan L. Davis
Keyword(s):  
Social Interaction ◽  
Change Blindness ◽  
Visual Features
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