The Research on the Traffic Rules of Freeways

2014 ◽  
Vol 926-930 ◽  
pp. 4154-4157
Author(s):  
Zhi Wei Yang
Keyword(s):  
Traffic Flow ◽  
Road Safety ◽  
Evaluation System ◽  
Evaluation Model ◽  
Safety Performance ◽  
Traffic Density ◽  
Appraisal System ◽  
Freeway Traffic ◽  
The Difference ◽  
Traffic Rules

In this paper, a study of freeway traffic rules, respectively, from the traffic flow and road safety performance provides a theoretical basis for the establishment of a more rational road rules. First, we set up an appraisal system of the traffic flow which describes the flow from the average speed, the traffic density, the overtaking rate. And we calculate them separately. Meanwhile, by fitting, we can obtain the relationship between the traffic flow and the overtaking ratio. Then, an evaluation system of the safety is established which is based on the IHSDM (the evaluation model for highway safety). We can use it to get the conclusion that when the difference between the speeds of running vehicles is greater, the corresponding accident rate is higher. And the rate has a direct response to the road safety performance. Also, we combine the overtaking model to explore the safety performance in different road rules. Finally, in the case of different traffic rules, we can get a comprehensive of the model.

Development of an Evaluation Model of Freeway Traffic Safety Facilities System

2013 ◽  
Vol 734-737 ◽  
pp. 1578-1581
Author(s):  
Yan Yong Guo ◽  
Yao Wu ◽  
Liang Song ◽  
Hui Duan
Keyword(s):  
Traffic Safety ◽  
Evaluation System ◽  
Evaluation Model ◽  
Variation Coefficient ◽  
Freeway Traffic ◽  
Evaluation Result ◽  
Single Index ◽  
Recognition Theory ◽  
Attribute Measure ◽  
Attribute Recognition

This study developed an evaluation model of freeway traffic safety facilities system. Firstly, an evaluation system of freeway traffic safety facility was proposed. Secondly, an evaluation model was proposed based on attribute recognition theory. And the evaluation result was identified according to the attribute measure value of single index and the comprehensive attribute measure value of multiple indexes as well as the confidence criterion. Thirdly, the weight of each indicator was decided by variation coefficient. Finally, A case of TAI-GAN freeway (K1+242~K3+259 segment) was conducted to verify the feasibility and effectiveness of the model.

Professional Development and Appraisal System for School Nurses

2002 ◽  
Vol 18 (4) ◽  
pp. 229-236
Author(s):  
Jane Tustin ◽  
Gloria Canham ◽  
Joanne Berridge ◽  
Deborah Braden ◽  
Thora Starke
Keyword(s):  
Evaluation System ◽  
Nursing Practice ◽  
Evaluation Model ◽  
School Nurse ◽  
School Nurses ◽  
School Nursing ◽  
Professional School ◽  
Appraisal System ◽  
Nurse Administrators ◽  
The Individual

Dissatisfied with current school nurse evaluation instruments, school nurse administrators sought to develop an appraisal system that would emphasize the professional role of the school nurse and provide a means to enhance individual practice. The newly revised Standards of Professional School Nursing Practice and the creation of a state teacher evaluation model presented the opportunity to produce an instrument that could be adapted within the educational setting for school nursing practice. The appraisal system included not only the methods to evaluate practice, but the means to involve the individual school nurse through goal setting. The process also included a structured intervention plan that facilitated remediation. This article describes the development of the appraisal system, the components, and the implementation of an evaluation system for school nurses.

scholarly journals A Modified Car-following Model Considering Traffic Density and Acceleration of Leading Vehicle

2020 ◽  
Vol 10 (4) ◽  
pp. 1268
Author(s):  
Xudong Cao ◽  
Jianjun Wang ◽  
Chenchen Chen
Keyword(s):  
Traffic Flow ◽  
Linear Stability Theory ◽  
Traffic Density ◽  
Neutral Stability ◽  
Difference Model ◽  
Velocity Difference ◽  
Car Following ◽  
Car Following Model ◽  
The Difference ◽  
Improved Model

Although the difference between the velocity of two successive vehicles is considered in the full velocity difference model (FVDM), more status information from preceding vehicles affecting the behavior of car-following has not been effectively utilized. For improving the performance of the FVDM, an extended modified car-following model taking into account traffic density and the acceleration of a leading vehicle (DAVD, density and acceleration velocity difference model) is presented under the condition of vehicle-to-vehicle (V2V) communications. Stability in the developed model is derived through applying linear stability theory. The curves of neutral stability for the improved model indicate that when the driver pays more attention to the traffic status in front, the traffic flow stability region is larger. Numerical simulation illustrates that traffic flow disturbance could be suppressed by gaining more information on preceding vehicles.

Intelligent Control System on Traffic Flow under the Keep-Right-Except-to-Pass Rule

2014 ◽  
Vol 951 ◽  
pp. 19-24
Author(s):  
Yi Hui Zha
Keyword(s):  
Control System ◽  
Traffic Flow ◽  
Intelligent Control ◽  
Evaluation Model ◽  
Flow Distribution ◽  
Flow Equation ◽  
Traffic Density ◽  
Model Parameters ◽  
Intelligent Control System ◽  
Flow Through

This paper studied the traffic flow under the keep-right-except-to-pass rule on freeways and the effect of intelligent control system on traffic flow. Through the analysis of the basic traffic flow equation, we developed the traffic flow-traffic density model, obtained the maximum traffic flow, determined the model parameters and tested the model. We defined an indicator reflecting of the degree of traffic flow distribution according to the Gini coefficient in economics and built an effect evaluation model to study the effect of intelligent control system on traffic flow.

Risk Evaluation for Bird Strike in Zhengzhou Airfield Based on the Danger Level to Aircraft

2012 ◽  
Vol 610-613 ◽  
pp. 699-703
Author(s):  
Fang Ran Zhao ◽  
Zhong Yuan Yuan ◽  
Tian Wang Zhang
Keyword(s):  
Evaluation System ◽  
Evaluation Model ◽  
Bird Species ◽  
Entropy Method ◽  
Risk Classification ◽  
Bird Strike ◽  
Prevention Measures ◽  
Five Factors ◽  
Integrated Risk ◽  
The Difference

Bird environment in different airfield is quite different, which results the causes of bird strike have significant differences. It should be based on the actual bird environment information and analysis results in different airfield, to develop practical prevention measures for bird strike. Through the investigations of bird situations in Zhengzhou airfield, combining with regularity and characteristics of the previous bird strike events, the five factors evaluation model of bird strike risk is initially built. Evaluation system for bird risk is built based on the principle of entropy method empowered. Based on the evaluation model of bird strike risk, the risk values and integrated risk values (IRV) of different bird species can be calculated in Zhengzhou airfield. The airfield birds are classified with the difference of bird strike risk according to the IRV. Specifically preventive proposals and measures are put forward based on bird strike risk classification for the different bird species. The results show that bird species of highest risk account for more than 20%, and higher risk more than 26%. Countermeasures of bird strike prevention are proposed with the results of risk classification. First it should be taken preventive measures, which focus on 7 bird species of IRV≥0.4. Second it should be paid attention to the prevention of 9 bird species on 0.3≤IRV<0.4.

Relationships between Road Safety and Traffic Volume Based on Fuzzy Matter-Element Model

2014 ◽  
Vol 568-570 ◽  
pp. 1875-1879
Author(s):  
Sheng Nan Zhang
Keyword(s):  
Traffic Safety ◽  
Road Safety ◽  
Evaluation System ◽  
Element Model ◽  
Flow Speed ◽  
Traffic Volume ◽  
Traffic Density ◽  
Security Level ◽  
Safety Level ◽  
Matter Element Model

In order to study road safety as well as the relationship between traffic volume and traffic safety, we introduce matter-element model to build safety evaluation system. In this model, we can get quantitative values of the degree how much it belongs to the certain safety level, including six security indexes such as traffic volume, traffic density and traffic-flow speed, as well as four different security levels. By combining two traffic conditions of the same section, we change the initial parameters of the traffic model to get security level grades of the two conditions. The results showed that with the increase in traffic volume, road safety decreases. However, when the traffic volume increases further, the road safety increases instead.

Application of Comprehensive Evaluation of the Airport Site Selection

2011 ◽  
Vol 97-98 ◽  
pp. 311-315 ◽  
Author(s):  
De Liang Ding ◽  
Liang Cai Cai ◽  
Xiao Long Wang ◽  
Bin Shao ◽  
Yi Zheng
Keyword(s):  
Site Selection ◽  
Evaluation System ◽  
Comprehensive Evaluation ◽  
Evaluation Model ◽  
Influence Factors ◽  
Appraisal System ◽  
Computation Process ◽  
Weighted Matrix ◽  
Gray Correlation ◽  
Airport Site

The most important step of building a new airport is site selection. Before selecting the new airport site, Airport planners should study many factors and rank the various sites. In fact, airport site selection is a complex multi-objective optimization problem, which involves a variety of factors. Taking “the civil airport construction and management requirements” as a foundation, the paper has screened and expanded the influence factors of selecting the civil airport site and constructed site appraisal system, and put forward the DAGF model，which constructed Evaluation System by improved Delphi method, obtained weighted matrix by AHP, analyzed experts score by gray correlation and got evaluation findings by Fuzzy evaluating. Meanwhile the paper has compiled the procedure of the computation process with MATLAB. Finally the research results has been applied to the selecting site of the second Capital airport in practice and obtained the satisfactory result. Therefore the paper constructed the comprehensive evaluation model, which provides the effective method for selecting the civil airport site, and makes the site selection more scientific, more reasonable and simpler. It has the extremely important reference significance and the instructional function to select the optimal airport site.

Professional Development and Appraisal System for School Nurses

2002 ◽  
Vol 18 (4) ◽  
pp. 229-236 ◽  
Author(s):  
Jane Tustin ◽  
Gloria Canham ◽  
Joanne Berridge ◽  
Deborah Braden ◽  
Thora Starke
Keyword(s):  
Evaluation System ◽  
Nursing Practice ◽  
Evaluation Model ◽  
School Nurse ◽  
School Nurses ◽  
School Nursing ◽  
Professional School ◽  
Appraisal System ◽  
Nurse Administrators ◽  
The Individual

Dissatisfied with current school nurse evaluation instruments, school nurse administrators sought to develop an appraisal system that would emphasize the professional role of the school nurse and provide a means to enhance individual practice. The newly revised Standards of Professional School Nursing Practice and the creation of a state teacher evaluation model presented the opportunity to produce an instrument that could be adapted within the educational setting for school nursing practice. The appraisal system included not only the methods to evaluate practice, but the means to involve the individual school nurse through goal setting. The process also included a structured intervention plan that facilitated remediation. This article describes the development of the appraisal system, the components, and the implementation of an evaluation system for school nurses.

Research on the Neural Network Learning Evaluation Model of Meteorological Technical Personnel

2014 ◽  
Vol 602-605 ◽  
pp. 3100-3103
Author(s):  
Xu Hua Deng ◽  
Xiang Gen Gan ◽  
Ren Wu
Keyword(s):  
Neural Network ◽  
Evaluation System ◽  
Evaluation Model ◽  
Neural Network Learning ◽  
Network Learning ◽  
Technical Personnel ◽  
Learning Evaluation ◽  
The Neural Network ◽  
The Difference ◽  
Network Platform

With the increasingly salient social influence of virtual practice, personalized lifelong learning concept could be realized through network platform. The new learning environment and platform generate the new evaluation system and model. The working experience and features of network learning of the meteorological technical personnel determine the difference between network evaluation model and the traditional summative evaluation system.. The nonlinearity between input vector and output vector also determines the neural network learning evaluation model orientation. The training and simulation show that the network learning evaluation achieves its best effect when the hidden node is 4.

An Iterative Learning Approach for Freeway Traffic Density Control

2011 ◽  
Vol 317-319 ◽  
pp. 1394-1397 ◽  
Author(s):  
Xin Rong Liang ◽  
Xiao Yan Wu ◽  
Jian Ye Li
Keyword(s):  
Traffic Flow ◽  
Flow Model ◽  
Control Variable ◽  
Iterative Learning ◽  
Ramp Metering ◽  
Traffic Density ◽  
Nonlinear Feedback ◽  
Freeway Traffic ◽  
Traffic Flow Model ◽  
Density Control

In this work, we apply iterative learning method to address the traffic density control problem in a macroscopic level freeway environment with ramp metering. The second-order traffic flow model is firstly formulated. Then traffic density is selected as the control variable in place of traffic occupancy. Based on the traffic flow model and in conjunction with nonlinear feedback theory, an iterative learning based traffic density controller is designed. Finally, the iterative learning based feedback controller is simulated in Matlab software. Simulation results show that this method has good dynamic and steady-state performance, and can achieve an almost perfect tracking performance.

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