(Urban Spatial Scaling: From active population to folding cities)
报告摘要：With data from various sources, we are able to better sense the activities of residents and the pulse of the whole city. Based on cell phone data and proper algorithms, we can get accurate trajectories of individuals, reveal the connection between house price and air pollution exposure of residents, and get active population (AP) distribution as well as the OD matrix of the city. By considering the travel demand together with features of the road network, we propose an indicator named population-weighted efficiency (PWE) which can give a more comprehensive and systematic evaluation of the efficiency of the transportation network, and detect 3 typical types of inefficient routes. In China, surrounding working units, residential area, universities, governments with walls (i.e., compounds or “big yard”) are quite common and unique, which is designed to an independent ecosystem, but nowadays can cause inefficiency of the city, and inconvenience to residents, and may have some other profound effects. And from a dynamical and interactive perspective, based on the concept of AP, we come up with a simple model (1 free parameter and 4 simple assumptions) to reproduce the spatial distribution within cities and explain the origins of spatial scaling within cities and scaling laws across cities at the same time. With the development of building and transportation technologies, the city sprawl itself in both 2D (fast routes) and 3D (skyscrapers) space, which is the old story we have been hearing for decades. From a brand new perspective, such processes are actually folding more space to the urban central area to further promotes human interactions. From such a folding cities perspective, we can better reveal the true structure of urban systems and change how we perceive our living environment.
报告人简介：李睿琪，北京化工大学信息科学与技术学院副教授，城市网络实验室主任，北京师范大学系统科学博士，博士期间在麻省理工学院与波士顿大学进行联合培养，本科就读于电子科技大学国际化软件人才实验班。主要研究方向为城市大数据分析与建模、社会网络研究与流行病传播动力学。目前发表SCI论文十余篇，引用150余次，相应工作发表在Nature Communications、Scientific Reports、PLoS One、Physica A等SCI期刊，并在Statphys25/26、Conference of Complex Systems、NetSci、NetSciX等多个国际大会上作口头报告，曾荣获第十二届社会网与社会资本研究年会最佳论文奖。目前是Scientific Reports、Habitat International、Cities、IEEE Access、PLoS One、Physica A、IJMPC、TRB/TRR等多个SCI与SSCI期刊的审稿人。
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