相关实验视频
Updated: Feb 28, 2026
16:14
Trajectory Data Analyses for Pedestrian Space-time Activity Study
Published on: February 25, 2013
14.3K
从轨迹数据中提取代表性路线的长度和使用权重指数.
1Department of Highway and Transportation Research, Korea Institute of Civil Engineering and Building Technology, Goyang-si 10223, Republic of Korea.
Sensors (Basel, Switzerland)
|February 27, 2026
概括
新的加权指数通过减少短路段偏差来改善车辆轨迹分析. 这提高了代表性路径提取的准确性,以更好地管理城市流动性.
科学领域:
- 运输科学 运输科学
- 数据科学数据科学数据科学
- 地理信息系统 地理信息系统
背景情况:
- 传统的车辆轨迹分析指标往往过度强调短路段,导致偏见的相似性评估和不稳定的路线分组.
- 这种偏见扭曲了从大规模城市轨迹数据中提取的路径的代表性.
研究的目的:
- 从大型车辆轨迹数据中提取代表性路径的新型加权指数.
- 为了减轻传统指标中固有的短链代表性的夸大.
主要方法:
- 开发了包括链接通过率,平均链接使用率和路径重叠在内的加权指数,所有这些都根据链接长度和使用频率进行了调整.
- 将这些指数应用于18,205个现实世界城市轨迹的数据集,以分析和与传统指标进行比较.
主要成果:
- 与传统方法相比,加权指数减少了20-30%的短链偏差,并将代表性路径分组的稳定性提高了15-30%.
- 证实权重指数准确地捕捉了基于GPS的轨迹的结构特征,反映了稳定的链接使用和重叠模式.
结论:
- 在链接层面上精细的轨迹相似度指标显著提高了代表性路径提取的准确性和稳定性.
- 这些进步对智能交通系统有直接影响,增强了诸如车辆公里走程估计和拥堵诊断等应用.
相关概念视频
01:22Mean free path and Mean free time
5.4K
Consider the gas molecules in a cylinder. They move in a random motion as they collide with each other and change speed and direction. The average of all the path lengths between collisions is known as the "mean free path."
5.4K
01:26Trapezoidal Rule
83
Estimating the distance traveled by a vehicle using its recorded velocity over time is a common problem in physics and engineering. When velocity data is available at discrete time intervals, rather than as a continuous function, numerical integration methods such as the trapezoidal rule are often employed to approximate the total displacement.The trapezoidal rule works by dividing the total time interval into several equal segments. Within each segment, the recorded velocities at the endpoints...
83
02:12Short-distance Transport of Resources
17.8K
Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
17.8K
01:10Interference: Path Lengths
2.3K
Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
2.3K
01:34Velocity and Position by Graphical Method
11.0K
Velocity and position can be calculated from the known function of acceleration as a function of time. The total area under the acceleration-time graph and the velocity-time graph gives the change in velocity and position, respectively. In the case of an airplane, its acceleration is tracked using the inertial navigation system. The pilot provides the input of the airplane's initial position and velocity before takeoff. The inertial navigation system then uses the acceleration data to...
11.0K
01:29Load along a Single Axis
672
In structural engineering, the analysis of beams subjected to varying loads is a critical aspect of understanding the behavior and performance of these structural elements. A common scenario involves a beam subjected to a combination of different load distributions.
Consider a beam of length L subjected to a varying load, which is a combination of parabolic and trapezoidal load distribution along the x-axis. In this case, it is essential to determine the resultant loads, their locations, and...
Consider a beam of length L subjected to a varying load, which is a combination of parabolic and trapezoidal load distribution along the x-axis. In this case, it is essential to determine the resultant loads, their locations, and...
672