scholarly journals Dataflow analysis of vehicle safety computers regarding high-speed maglev transportation based on data priorities

2018 ◽  
Vol 4 (3 suppl. 1) ◽  
pp. 264-271
Author(s):  
Yijun Chen ◽  
Yi Yu ◽  
Huahua Zhao ◽  
Fangqi Zhang ◽  
Hui Lin ◽  
...  
Keyword(s):  
High Speed ◽  
Analysis Data ◽  
Vehicle Safety ◽  
Dataflow Analysis ◽  
Interface Analysis ◽  
Dataflow Model ◽  
Data Priority

To analyze the dataflow of vehicle safety computers regarding high-speed maglev transportation, it is considerable to add data priorities to the dataflow model of vehicle safety computers to improve the accuracy. With regard to vehicle safety computers, we choose VSC1 as our research object. First, we give a brief summary for the interface relationships of VSC1. Next, we analyze the data priorities of VSC1 in detail. After that, we present the dataflow model of VSC1 with priorities.  Finally, we make a brief conclusion. The structure of the abstract of an article is strictly arranged and should encompass the following points: Background: Dataflow model of Vehicle Safety Computers regarding high-speed maglev transportation. Aim: To analyze the dataflow of vehicle safety computers with data priorities. Methods:  interface analysis, data priority analysis and dataflow chart. Results: The dataflow model of VSC1 with data priorities is presented. Conclusion: Adding data priorities to the dataflow model of vehicle safety computers to improve the accuracy is fulfilled. The recommended number of words in the abstract is 500.

scholarly journals Reduction in Physical Match Performance at the Start of the Second Half in Elite Soccer

2011 ◽  
Vol 6 (2) ◽  
pp. 174-182 ◽  
Author(s):  
Matthew Weston ◽  
Alan M. Batterham ◽  
Carlo Castagna ◽  
Matthew D. Portas ◽  
Christopher Barnes ◽  
...  
Keyword(s):  
High Speed ◽  
Analysis Data ◽  
Effect Sizes ◽  
Match Analysis ◽  
Warm Up ◽  
Total Distance ◽  
Mean Differences ◽  
English Premier League ◽  
Opening Phase ◽  
Physical Match

Purpose:Soccer referees’ physical match performances at the start of the second half (46–60 min) were evaluated in relation to both the corresponding phase of the first half (0–15 min) and players’ performances during the same match periods.Methods:Match analysis data were collected (Prozone, UK) from 12 soccer referees on 152 English Premier League matches during the 2008/09 soccer season. Physical match performance categories for referees and players were total distance, high-speed running distance (speed >5.5 m/s), and sprinting distance (>7.0 m/s). The referees’ heart rate was recorded from the start of their warm-up to the end of the match. The referees’ average distances (in meters) from the ball and fouls were also calculated.Results:No substantial differences were observed in duration (16:42 ± 2:35 vs 16:27 ± 1:00 min) or intensity (107 ± 11 vs 106 ± 14 beats/min) of the referees’ preparation periods immediately before each half. Physical match performance was reduced during the initial phase of the second half when compared with the first half in both referees (effect sizes—standardized mean differences—0.19 to 0.73) and players (effect sizes 0.20 to 1.01). The degree of the decreased performance was consistent between referees and players for total distance (4.7 m), high-speed running (1.5 m), and sprinting (1.1 m). The referees were closer to the ball (effect size 0.52) during the opening phase the second half.Conclusion:Given the similarity in the referees’ preparation periods, it may be that the reduced physical match performances observed in soccer referees during the opening stages of the second half are a consequence of a slower tempo of play.

The Influence of Future Vehicle Safety Network Impact on Traffic Flow

2014 ◽  
Vol 505-506 ◽  
pp. 985-989
Author(s):  
Jian Qun Wang ◽  
Xu Dong Li ◽  
Ya Fei Xiong
Keyword(s):  
Traffic Flow ◽  
High Speed ◽  
Rapid Development ◽  
Vehicle Safety ◽  
Navigation Systems ◽  
The Future ◽  
Network Safety ◽  
On The Road ◽  
Safety Applications ◽  
Vehicle Network

With the rapid development of high-speed mobile networks, the mobile applications related to vehicle safety, navigation systems are increasingly present in our lives, it is more and more easy for the driver to understand the situation on the road ahead, and this kind of change will greatly affect future traffic conditions. This article uses cellular automaton to simulate basic road sections, considering two modes of vehicle network safety applications may affect the future traffic flow, through the simulation, analysis the basic traffic flow data, conclude how the future vehicle network safety applications impact on traffic flow.

New method to evaluate three-dimensional push-off angle during short-track speed skating using wearable inertial measurement unit sensors

2019 ◽  
Vol 233 (4) ◽  
pp. 476-480 ◽  
Author(s):  
Kyungsoo Kim ◽  
Jun Seok Kim ◽  
Tserenchimed Purevsuren ◽  
Batbayar Khuyagbaatar ◽  
SuKyoung Lee ◽  
...  
Keyword(s):  
Motion Analysis ◽  
Inertial Measurement Unit ◽  
High Speed ◽  
Three Dimensional ◽  
Analysis Data ◽  
New Method ◽  
Measurement Unit ◽  
Angle Estimation ◽  
Inertial Measurement ◽  
Speed Skating

The push-off mechanism to generate forward movement in skating has been analyzed by using high-speed cameras and specially designed skates because it is closely related to skater performance. However, using high-speed cameras for such an investigation, it is hard to measure the three-dimensional push-off force, and a skate with strain gauges is difficult to implement in the real competitions. In this study, we provided a new method to evaluate the three-dimensional push-off angle in short-track speed skating based on motion analysis using a wearable motion analysis system with inertial measurement unit sensors to avoid using a special skate or specific equipment insert into the skate for measurement of push-off force. The estimated push-off angle based on motion analysis data was very close to that based on push-off force with a small root mean square difference less than 6% when using the lateral marker in the left leg and the medial marker in the right leg regardless of skating phase. These results indicated that the push-off angle estimation based on motion analysis data using a wearable motion capture system of inertial measurement unit sensors could be acceptable for realistic situations. The proposed method was shown to be feasible during short-track speed skating. This study is meaningful because it can provide a more acceptable push-off angle estimation in real competitive situations.

The Effects of Tire Nonlinearity on Vehicle Steering Stability at High Speed

2014 ◽  
Vol 505-506 ◽  
pp. 301-309
Author(s):  
Hua Dong Xu
Keyword(s):  
High Speed ◽  
Necessary Conditions ◽  
Front Wheel ◽  
Vehicle Safety ◽  
Slip Angle ◽  
Vehicle Speed ◽  
Tire Model ◽  
Dynamics Model ◽  
Steering Angle ◽  
Yaw Rate

The steering stability of a vehicle at high speed is the urgent key problem to be solved of automobile independent development. And it is also the premise and one of the necessary conditions of vehicle safety. Considering of the effects of tire nonlinearity, a 4-DOF dynamics model for a vehicle is established. The yaw rate responses, side slip angle, carriage roll angle and front wheel steering angle with different vehicle speeds are calculated. The calculated values are then compared with the values without considering of the effects of tire nonlinearity. The simulations results show that the vehicle responses can be reflected accurately by using nonlinear tire model. With the bigger vehicle speed, the effects of tire nonlinearity on vehicle high-speed steering stability become more obvious.

Energy absorption capability of origami automobile bumper system

2019 ◽  
Vol 233 (18) ◽  
pp. 6577-6587
Author(s):  
Lin Yuan ◽  
Jiayao Ma ◽  
Zhong You
Keyword(s):  
Energy Absorption ◽  
High Speed ◽  
Failure Modes ◽  
Absorption Efficiency ◽  
Vital Role ◽  
Vehicle Safety ◽  
Energy Absorption Efficiency ◽  
Stable Performance ◽  
Absorption Performance ◽  
Bumper System

The crashworthiness of an automobile bumper plays a vital role in overall vehicle safety. Energy absorption efficiency, as well as predictable and stable performance, are the most demanding features in the design of the bumper system. To this end, this paper presents a series of innovative bumper designs using built-in origami patterns. Also, we outline a numerical framework for evaluating the energy absorption performance of a bumper when subjected to an impact loading. Comparative analyses on full frontal and 40% offset frontal impact tests are conducted numerically for both low and high-speed scenarios. It is found that the designed failure modes are successfully triggered and followed during the collision process for the combined origami beam-origami crash box design. Most importantly, this optimal design could absorb 31.5% more energy than the conventional bumper.

scholarly journals Unpacking the implementation blackbox using 'actor interface analysis': how did actor relations and practices of power influence delivery of a free entitlement health policy in India?

2020 ◽  
Vol 35 (Supplement_2) ◽  
pp. ii74-ii83
Author(s):  
Rakesh Parashar ◽  
Nilesh Gawde ◽  
Anadi Gupt ◽  
Lucy Gilson
Keyword(s):  
Health Policy ◽  
Policy Process ◽  
Analysis Data ◽  
Public Hospitals ◽  
Child Health Services ◽  
Power Relationships ◽  
Framework Analysis ◽  
Interface Analysis ◽  
Values And Beliefs ◽  
Organizational Hierarchies

Abstract Exploring the implementation blackbox from a perspective that considers embedded practices of power is critical to understand the policy process. However, the literature is scarce on this subject. To address the paucity of explicit analyses of everyday politics and power in health policy implementation, this article presents the experience of implementing a flagship health policy in India. Janani Shishu Suraksha Karyakram (JSSK), launched in the year 2011, has not been able to fully deliver its promises of providing free maternal and child health services in public hospitals. To examine how power practices, influence implementation, we undertook a qualitative analysis of JSSK implementation in one state of India. We drew on an actor-oriented perspective of development and used ‘actor interface analysis’ to guide the study design and analysis. Data collection included in-depth interviews of implementing actors and JSSK service recipients, document review and observations of actor interactions. A framework analysis method was used for analysing data, and the framework used was founded on the constructs of actor lifeworlds, which help understand the often neglected and lived realities of policy actors. The findings illustrate that implementation was both strengthened and constrained by practices of power at various interface encounters. The implementation decisions and actions were influenced by power struggles such as domination, control, resistance, contestation, facilitation and collaboration. Such practices were rooted in: Social and organizational power relationships like organizational hierarchies and social positions; personal concerns or characteristics like interests, attitudes and previous experiences and the worldviews of actors constructed by social and ideological paradigms like their values and beliefs. Application of ‘actor interface analysis’ and further nuancing of the concept of ‘actor lifeworlds’ to understand the origin of practices of power can be useful for understanding the influence of everyday power and politics on the policy process.

Proposal for systematic studies of active suspension failures in rail vehicles

2016 ◽  
Vol 232 (1) ◽  
pp. 199-213 ◽  
Author(s):  
Alireza Qazizadeh ◽  
Sebastian Stichel ◽  
Rickard Persson
Keyword(s):  
High Speed ◽  
Failure Modes ◽  
Ride Comfort ◽  
Fault Tree Analysis ◽  
Active Suspension ◽  
Vehicle Safety ◽  
Active Suspensions ◽  
Analysis Techniques ◽  
Rail Vehicle ◽  
Rail Vehicles

Application of active suspensions in high-speed passenger trains is gradually getting more and more common. Active suspensions are primarily aimed at improving ride comfort, wear or stability. Failure of these systems may not only just deteriorate the performance but it may also put vehicle safety at risk. There are not many studies that explain how a thorough study proving safety of active suspension should be performed. Therefore, initiating this type of study is necessary for not only preventing incidences but also for assuring acceptance of active suspension by rail vehicle operators and authorities. This study proposes a flowchart for systematic studies of active suspension failures in rail vehicles. The flowchart steps are solidified by using failure mode and effects analysis and fault tree analysis techniques and also acceptance criteria from the EN14363 standard. Furthermore, six failure modes are introduced which are very general and their use can be extended to other studies of active suspension failure. In the last section of the paper, the proposed flowchart is put into practice through four failure examples of active vertical suspension.

Individualization of Time–Motion Analysis: A Case-Cohort Example

2013 ◽  
Vol 8 (4) ◽  
pp. 456-458 ◽  
Author(s):  
Ric Lovell ◽  
Grant Abt
Keyword(s):  
Motion Analysis ◽  
High Intensity ◽  
High Speed ◽  
Analysis Data ◽  
Soccer Players ◽  
Match Play ◽  
Type Method ◽  
Motion Data ◽  
Time Motion ◽  
External Loads

Purpose:To report the intensity distribution of Premier League soccer players’ external loads during match play, according to recognized physiological thresholds. The authors also present a case in which individualized speed thresholds changed the interpretation of time–motion data.Method:Eight outfield players performed an incremental treadmill test to exhaustion to determine the running speeds associated with their ventilatory thresholds. The running speeds were then used to individualize time–motion data collected in 5 competitive fixtures and compared with commonly applied arbitrary speed zones.Results:Of the total distance covered, 26%, 57%, and 17% were performed at low, moderate, and high intensity, respectively. Individualized time– motion data identified a 41% difference in the high-intensity distance covered between 2 players of the same positional role, whereas the player-independent approach yielded negligible (5–7%) differences in total and high-speed distances covered.Conclusions:The authors recommend that individualized speed thresholds be applied to time–motion-analysis data in synergy with the traditional arbitrary approach.

scholarly journals Dimension Reduction Big Data Using Recognition of Data Features Based on Copula Function and Principal Component Analysis

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Fazel Badakhshan Farahabadi ◽  
Kianoush Fathi Vajargah ◽  
Rahman Farnoosh
Keyword(s):  
Principal Component Analysis ◽  
Dimension Reduction ◽  
High Speed ◽  
Principal Component ◽  
Analysis Data ◽  
Component Analysis ◽  
Copula Function ◽  
Analysis Method ◽  
Principal Component Analysis Method ◽  
Effective Dimensions

Nowadays, data are generated in the world with high speed; therefore, recognizing features and dimensions reduction of data without losing useful information is of high importance. There are many ways to dimension reduction, including principal component analysis (PCA) method, which is by identifying effective dimensions in an acceptable level, reducing dimension of data. In the usual method of principal component analysis, data are usually normal, or we normalize data; then, the principal component analysis method is used. Many studies have been done on the principal component analysis method as a step of data preparation. In this paper, we propose a method that improves the principal component analysis method and makes data analysis easier and more efficient. Also, we first identify the relationships between the data by fitting the multivariate copula function to data and simulate new data using the estimated parameters; then, we reduce the dimensions of new data by principal component analysis method; the aim is to improve the performance of the principal component analysis method to find effective dimensions.

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