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Central Tendency: Analysis01:10

Central Tendency: Analysis

225
Measures of central tendency are tools used in biostatistics to identify the average or center of a dataset. They offer a single representative value for understanding and summarizing data distribution.
The mean is one such measure, calculated by totaling all values in a dataset and dividing by the number of values. For instance, the mean blood pressure reading (120, 130, 140, 150) would be 135. However, the mean can be affected by extreme values or outliers.
The median, another measure,...
225
Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

549
Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it...
549
Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

455
Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
Here, in order to determine the magnitude of velocity and acceleration for point...
455
Selected Data About Geographic Locations01:25

Selected Data About Geographic Locations

72
Geographic Information Systems (GIS) rely on two core types of data: spatial data and attribute data.Spatial DataSpatial data defines the physical location of features within a coordinate system, typically expressed in terms of latitude and longitude. It provides precise positioning for elements like roads, rivers, or buildings.Attribute DataAttribute data complements spatial data by adding descriptive information about these features. For example, a road's spatial data includes its start and...
72
Absolute Motion Analysis- General Plane Motion01:24

Absolute Motion Analysis- General Plane Motion

273
Visualize a drone, with its propellers spinning rapidly, hovering mid-air. The fascinating movements and operations of this drone can be comprehended by applying the principle of general plane motion.
As the drone's propellers rotate, an upward force is generated that counteracts the force of gravity, enabling the drone to lift off from the ground. This initial movement of the drone is along a straight path, representing a form of translational motion. In this phase, every point on the...
273

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相关实验视频

Updated: Sep 19, 2025

Trajectory Data Analyses for Pedestrian Space-time Activity Study
16:14

Trajectory Data Analyses for Pedestrian Space-time Activity Study

Published on: February 25, 2013

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使用轨迹大数据调查中心位置理论.

Pengjun Zhao1,2,3, Haoyu Hu1, Zhao Yu4

  • 1College of Urban and Environmental Sciences, Peking University, Beijing 100871, China.

Fundamental research
|June 18, 2025
PubMed
概括

中心位置理论 (CPT) 解释了中国的农村定居模式和服务范围.

关键词:
大数据就是大数据.中心位置理论的中心位置理论.中国中国中国中国.移动电话数据 移动电话数据结算系统的结算系统

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科学领域:

  • 人类地理的人类地理
  • 城市规划 城市规划
  • 地理空间分析的研究.

背景情况:

  • 开发于90年前的中央位置理论 (CPT) 提供了一个理解定居系统的框架.
  • 在当前的信息化和地理空间重建时代,CPT的适用性需要重新评估.
  • 人类定居点系统对土地利用,基础设施和环境影响有重大影响.

研究的目的:

  • 评估CPT的定量法在当代农村定居点系统中的相关性.
  • 通过大规模移动电话轨迹数据分析定居点分布和服务范围.
  • 调查CPT原则对结算层次和服务领域的影响.

主要方法:

  • 从中国金金吉地区的3750万手机用户中利用了2.0362亿次旅行轨迹.
  • 分析了基于旅行行为数据的定居点分布模式和服务范围.
  • 研究了旅行量,距离和定居点等级之间的关系.

主要成果:

  • 结算分配与CPT的等级法相一致,更接近行政原则 (K=7).
  • 结算服务范围也遵循CPT的等级法,更接近营销原则 (K=3).
  • 为农村居民确定了大约3公里的基本服务范围,旅行量从线性转移到超越这个距离的权力法分配.

结论:

  • CPT的传统原则继续影响结算服务范围和层次 (K值).
  • 这些因素的空间影响在不同地区有所不同.
  • 这些发现提高了对快速城市化社会中CPT和定居点系统的理解.