A method of determining route safety based on graphical logic AND operation

2017 ◽  
Author(s):  
Yang Huadong ◽  
Cao Liang
Keyword(s):  
Route Safety

Classification method of marine target motion pattern based on spatial-temporal trajectories

2021 ◽  
pp. 1-15
Author(s):  
Baichen Jiang ◽  
Wei Zhou ◽  
Jian Guan ◽  
Jialong Jin
Keyword(s):  
Pattern Classification ◽  
Training Sample ◽  
Classification Algorithm ◽  
Classification Model ◽  
Motion Pattern ◽  
Motion Patterns ◽  
Lp Norm ◽  
Sparse Representation Classification ◽  
Route Safety

Classifying the motion pattern of marine targets is of important significance to promote target surveillance and management efficiency of marine area and to guarantee sea route safety. This paper proposes a moving target classification algorithm model based on channel extraction-segmentation-LCSCA-lp norm minimization. The algorithm firstly analyzes the entire distribution of channels in specific region, and defines the categories of potential ship motion patterns; on this basis, through secondary segmentation processing method, it obtains several line segment trajectories as training sample sets, to improve the accuracy of classification algorithm; then, it further uses the Leastsquares Cubic Spline Curves Approximation (LCSCA) technology to represent the training sample sets, and builds a motion pattern classification sample dictionary; finally, it uses lp norm minimized sparse representation classification model to realize the classification of motion patterns. The verification experiment based on real spatial-temporal trajectory dataset indicates that, this method can effectively realize the motion pattern classification of marine targets, and shows better time performance and classification accuracy than other representative classification methods.

Logistic Model for Rating Urban Bicycle Route Safety

2004 ◽  
Vol 1878 (1) ◽  
pp. 107-115 ◽  
Author(s):  
Cheryl Allen-Munley ◽  
Janice Daniel ◽  
Sunil Dhar
Keyword(s):  
Logistic Model ◽  
Route Safety

Future Air Traffic Management: Quantitative En Route Safety Assessment Part 2 – New Approaches

2002 ◽  
Vol 55 (3) ◽  
pp. 363-379 ◽  
Author(s):  
Peter Brooker
Keyword(s):  
Traffic Management ◽  
Safety Assessment ◽  
Hazard Analysis ◽  
Air Traffic Management ◽  
Air Traffic ◽  
Abstract Concepts ◽  
Collision Risk ◽  
Route Safety ◽  
The Right ◽  
Quantitative Safety Assessment

This is the second of two papers on Quantitative Safety Assessment – vital to the successful introduction of future Air Traffic Management systems. The focus is en route European controlled commercial traffic, particularly the mid-air collision risk. Part 2 develops soundly based and practical methods for safety assessment. The objective is to determine the key questions and the best ways to answer them. Aspects covered include lessons from Hazard Analysis and Airproxes together with ‘realistic’ risk budgeting. Two abstract concepts are introduced: Position Integrity and Reasonable Intent (essentially the need to be on the ‘right’ flight path), and their implications for risk calculations are discussed.

scholarly journals Research on the Safety Audit Methods for Two-Lane Highway Based on HRV

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Zhan-dong Zhu ◽  
Ying-chih Lu ◽  
Cheng-hong Fu ◽  
Ting Xu
Keyword(s):  
Velocity Gradient ◽  
Road Safety ◽  
Evaluation Criteria ◽  
Safety Evaluation ◽  
Operating Speed ◽  
Acceleration Rate ◽  
Design Speed ◽  
Route Safety ◽  
The Relationship ◽  
Speed Gradient

In order to explore stable route safety evaluation indicators, this study discusses the relationship between the heart rate variability (HRV) and other factors, such as design speed, operating speed, acceleration rate, and velocity gradient through a lot of experiments. The results show that operating speed coordination and velocity gradient (Gv) outperform others as road safety indicators. Speed coordination evaluation criteria:|ΔV85|≤10 km/h, good coordination; 10 km/h≤|ΔV85|≤ 20 km/h, general coordination, route indicators of adjacent sections should be adjusted, so that the speed difference is not more than 10 km/h;|ΔV85|≥20 km/h, poor speed coordination, it needs to readjust the design of the adjacent sections. Speed gradient evaluation criteria:Gv≤0.10, good road safety;0.10≤Gv<0.15, common road safety;Gv>0.15, poor road safety and the adjacent sections need to readjust. The conclusions provide the theoretical reference for highway safety evaluation.

The Aggie Blue Bikes Program: Implications of Leisure Involvement toward Bicycle Commuting

2010 ◽  
Vol 34 (1) ◽  
pp. 34-44
Author(s):  
Jonathan C. Norling ◽  
Mary Sara Wells ◽  
Adam Christensen
Keyword(s):  
City Planning ◽  
Motor Vehicle ◽  
Campus Recreation ◽  
Vehicle Ownership ◽  
Physically Active ◽  
Bicycle Commuting ◽  
Participation Level ◽  
And Gender ◽  
Recreation Professionals ◽  
Route Safety

This study was conducted at a campus recreation department through the Aggie Blue Bikes (ABB) program. The purpose of this study was to determine changes in bicycle commuting involvement level in a pretest-posttest design, and to determine predictors of ABB participation level conducted in a regression analysis. The results were significant change scores for a unidimensional measure of involvement and for involvement subscales (centrality, identity expression and identity affirmation dimensions), but not significantly so for attraction and social bonding dimensions. ABB participation was predicted by involvement, motor vehicle ownership, and gender, but route safety and weather were not significant predictors. These findings may be of importance to researchers in active transport, city planning, and recreation and leisure. Campus recreation professionals can use the information toward increasing physically active students through bicycle commuting.

scholarly journals Multiobjective Route Planning Model and Algorithm for Emergency Management

2015 ◽  
Vol 2015 ◽  
pp. 1-17 ◽  
Author(s):  
Wen-mei Gai ◽  
Zhong-an Jiang ◽  
Yun-feng Deng ◽  
Jing Li ◽  
Yan Du
Keyword(s):  
Multiobjective Optimization ◽  
Optimization Problem ◽  
Feasible Solution ◽  
Route Planning ◽  
Weight Coefficient ◽  
Planning Problem ◽  
Emergency Logistics ◽  
Simulation Results ◽  
Route Safety ◽  
Weight Coefficients

In order to model route planning problem for emergency logistics management taking both route timeliness and safety into account, a multiobjective mathematical model is proposed based on the theories of bounded rationality. The route safety is modeled as the product of safety through arcs included in the path. For solving this model, we convert the multiobjective optimization problem into its equivalent deterministic form. We take uncertainty of the weight coefficient for each objective function in actual multiobjective optimization into account. Finally, we develop an easy-to-implement heuristic in order to gain an efficient and feasible solution and its corresponding appropriate vector of weight coefficients quickly. Simulation results show the effectiveness and feasibility of the models and algorithms presented in this paper.

Incorporating a Safety Index into Pathfinding

2017 ◽  
Vol 2659 (1) ◽  
pp. 63-70 ◽  
Author(s):  
Zhaoxiang He ◽  
Xiao Qin
Keyword(s):  
Travel Time ◽  
Traffic Safety ◽  
Hazard Index ◽  
Specific Information ◽  
Safety Index ◽  
Safety Hazard ◽  
Pavement Condition ◽  
Index Model ◽  
Deceleration Rate ◽  
Route Safety

Travelers around the world are concerned with choosing not only the quickest route from one point to another but also the safest route. Traffic safety has always been a major public concern, and traffic safety performance should be constantly evaluated so that both reactive and proactive countermeasures can help reduce crashes. This study developed a methodology for incorporating safety aspects into travelers’ pathfinding process. The safe pathfinding process included two main parts: a route-specific safety hazard index and a route-finding algorithm that considered both travel time and safety. The ratio of the deceleration rate to avoid a crash to the maximum available deceleration rate was chosen as the proxy for traffic safety. The safety hazard index was formulated by using the collision mechanism along the roadway segment and at the intersection. Motorist-specific information (e.g., vehicle type, age, pavement condition) was also included in the safety index model so that a traveler’s individual needs could be considered. The pathfinding algorithm, which combined mobility and safety, had three objectives: shorter travel time, lower route safety hazard index, and avoidance of sites with the highest safety hazard index along the route. The methodology was applied in a real-world street network to demonstrate its use and prove the concept of finding a safe path.

scholarly journals PRACTICAL FEATURES OF ECDIS SAFETY DEPTH CALCULATION

2020 ◽  
Vol 30 (1) ◽  
pp. 16-26
Author(s):  
O. Burenkov ◽  
◽  
O. Pipchenko ◽  
A. Aleksishin ◽  
◽  
...  
Keyword(s):  
Traffic Management ◽  
Planning Process ◽  
Planning And Control ◽  
Company Policy ◽  
Safety Parameters ◽  
Route Safety ◽  
Navigation Accuracy ◽  
Marine Navigation ◽  
And Control ◽  
Cross Track

The safety of marine navigation in coastal areas and narrow waters, which account for 80% of total navigational accidents, remains a pressing concern. These circumstances indicate the need to improve traditional and automated methods of passage planning and control of navigation and traffic management processes, based on the assessment of the actual navigation accuracy and navigation safety parameters. According to current industry recommendations, the main parameters of safe navigation are safety depth, safety contour, permissible cross-track limit, and accuracy of position fixing. This study deals with the development of a general practical approach to the calculation of the safety depth, as one of the main safety parameters in the ECDIS system, with an increased focus on those aspects of calculation where navigators tend to make mistakes. Analysis of data obtained during the training on the ECDIS simulator for navigators directly involved in the passage planning process (master, navigation officer) showed systematic mistakes in assessing the route safety, which can lead to ship grounding in real world. At the same time, navigators often do not recognize the danger, misinterpret it or make mistakes when checking the passage plan for safety. The results of the competence assessment showed that 40% of masters and 30% of navigation officers make mistakes in calculating the safety depth. The most common mistakes are the incorrect application of category zones of confidence (CATZOC), miscalculation of the minimum depth on the route, miscalculation of the tide height, tidal window period, the neglect of corrections for increased draught due to roll and pitch. The paper suggests that the UKC (under keel clearance) company policy shall take into account the accuracy of chart information. Furthermore, the research further develops the method of calculating the safety depth, implemented in the software, which makes it possible to systematically assess the safety of a route with multiple legs with heterogeneous parameters.

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