scholarly journals Spatiotemporal Change Characteristics of Nodes’ Heterogeneity in the Directed and Weighted Spatial Interaction Networks: Case Study within the Sixth Ring Road of Beijing, China

2019 ◽  
Vol 11 (22) ◽  
pp. 6359 ◽  
Author(s):  
Jing Yang ◽  
Disheng Yi ◽  
Jingjing Liu ◽  
Yusi Liu ◽  
Jing Zhang
Keyword(s):  
Spatial Heterogeneity ◽  
Spatial Interaction ◽  
Early Morning ◽  
Interaction Networks ◽  
Urban Systems ◽  
Urban Structure ◽  
Coordinated Development ◽  
Geographic Space ◽  
Beijing China

Spatial heterogeneity patterns in cities are an essential topic in geographic research and urban planning. This paper analyzes the spatial heterogeneity of places and reflects on the urban structure in cites based on spatial interaction networks. To begin with, we constructed 24 sequentially directed and weighted spatial interaction networks (DWNs) on the basis of points of interest (POIs) and taxi GPS data in Beijing. Then, we merged 24 sequential networks into four clusters: early morning, morning, afternoon, and evening. Next, we introduced the weighted D-core decomposition method in view of the complex network method and weighted distance in a geographic space in order to obtain the in-coreness/out-coreness of places. Finally, three indices (the entropy index, the node symmetry index, and the t-test) were used to measure the heterogeneity of places from both the strength dimension and the direction dimension. The results showed: (1) For the strength dimension, the spatiotemporal strength characteristics of the nodes in the DWN are uneven on weekdays or on the weekends, and the strength heterogeneity on weekdays is more obvious than on weekends; (2) for the direction dimension, out-flows and in-flows are different in the early morning and evening on weekends. In addition, the direction of the DWN is not obvious. The city networks present flat characteristics. This study used the weighted D-core method to identify the heterogeneity of nodes in the DWN, which has certain theoretical and practical value for the planning of urban and urban systems and the coordinated development of cities.

scholarly journals Stochastic modelling of urban structure

2018 ◽  
Vol 474 (2213) ◽  
pp. 20170700 ◽  
Author(s):  
L. Ellam ◽  
M. Girolami ◽  
G. A. Pavliotis ◽  
A. Wilson
Keyword(s):  
Spatial Interaction ◽  
Structural Evolution ◽  
Interaction Model ◽  
Stochastic Modelling ◽  
Urban Structure ◽  
Spatial Interaction Models ◽  
The Core ◽  
Structural Variables ◽  
Core Elements

The building of mathematical and computer models of cities has a long history. The core elements are models of flows (spatial interaction) and the dynamics of structural evolution. In this article, we develop a stochastic model of urban structure to formally account for uncertainty arising from less predictable events. Standard practice has been to calibrate the spatial interaction models independently and to explore the dynamics through simulation. We present two significant results that will be transformative for both elements. First, we represent the structural variables through a single potential function and develop stochastic differential equations to model the evolution. Second, we show that the parameters of the spatial interaction model can be estimated from the structure alone, independently of flow data, using the Bayesian inferential framework. The posterior distribution is doubly intractable and poses significant computational challenges that we overcome using Markov chain Monte Carlo methods. We demonstrate our methodology with a case study on the London, UK, retail system.

IMPACT OF THE SOUTH-TO-NORTH WATER DIVERSION PROJECT ON GROUNDWATER RESOURCES: A CASE STUDY IN PINGGU BASIN, BEIJING, CHINA

2013 ◽  
Vol 12 (11) ◽  
pp. 2239-2247 ◽  
Author(s):  
Guomin Li ◽  
Haizhen Xu ◽  
Ming Li ◽  
Shouquan Zhang ◽  
Yanhui Dong ◽  
...  
Keyword(s):  
Groundwater Resources ◽  
Water Diversion ◽  
The South ◽  
Water Diversion Project ◽  
North Water ◽  
Beijing China

scholarly journals Spaces of Dependence and Emancipation in Architectural and Urban Narration, a Case Study: Plac Żołnierza Polskiego and Plac Solidarności in Szczecin

Arts ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 19
Author(s):  
Izabela Kozłowska ◽  
Eryk Krasucki
Keyword(s):  
Soviet Union ◽  
Political Environment ◽  
Economic Factors ◽  
Urban Structure ◽  
Eastern European ◽  
Authoritarian State ◽  
The Soviet Union ◽  
Urban Narratives ◽  
Eastern European Countries

Central and Eastern European countries were subjugated to the Soviet Union in the second half of the 20th century. In this new political environment, defined as the period of dependency, the concept of space gained a new denotation as a space of dependence, in both social and physical terms. The political changes that took place after 1989 enabled these spaces to be emancipated. In this work, we aim to delineate the complex relationship between architecture and politics from the perspective of spaces of dependence and their emancipation. Through a case study of two squares, plac Żołnierza Polskiego (the Square of the Polish Soldier) and plac Solidarności (Solidarity Square) in Szczecin, we gained insights into the processes and strategies that promoted their evolution into spaces of emancipation within architectural and urban narratives. Szczecin’s space of dependence was created by an authoritarian state that had a monopoly on defining architecture and urban planning in the country and the state as a whole. In a process orchestrated by economic factors, as well as the scale of architectural and urban degradation, the squares under discussion have transitioned from spaces of dependency to spaces of emancipation. As a result, an architectural-urban structure characterized by new cultural and identity values has been created.

scholarly journals Community Preferences for Urban Systems Transformation in Australia

2021 ◽  
Vol 13 (9) ◽  
pp. 4749
Author(s):  
Milo Costanza-van den Belt ◽  
Tayanah O’Donnell ◽  
Robert Webb ◽  
Eleanor Robson ◽  
Robert Costanza ◽  
...  
Keyword(s):  
Decision Making ◽  
Urban Areas ◽  
Online Survey ◽  
Shared Vision ◽  
Urban Systems ◽  
Urban Structure ◽  
Sustainable Cities ◽  
Community Needs ◽  
National Workshop ◽  
Systems Transformation

Civil society engagement is important for enabling urban systems transformations that meet community needs. The development of Future Earth Australia’s Sustainable Cities and Regions: A 10-Year Strategy for Urban Systems was underpinned by cross-sectoral workshops in 7 Australian urban areas and interviews with key stakeholders to create a shared vision of both current and desired future urban structure and policy. We then created an online survey to gauge broader community feedback on the vision which emerged from these workshops and interviews, to compare their outcomes with the views of community members who could be directly impacted by urban decision-making. The survey consisted of 35 questions, which were shaped by the issues emerging from the workshops and interviews. The sample was self-selected, and the 641 respondents represented a cross-section of individuals interested in sustainable cities. Our survey results supported and expanded on the major conclusions of FEA’s National workshop and interview processes, including the need to develop transparent and responsive decision-making processes, limit waste and pollution and develop effective housing and transport alternatives with mixed-use neighborhoods and adequate green space.

Estimating NOx removal capacity of urban trees using stable isotope method: A case study of Beijing, China

2021 ◽  
Vol 290 ◽  
pp. 118004
Author(s):  
Cheng Gong ◽  
Chaofan Xian ◽  
Bowen Cui ◽  
Guojin He ◽  
Mingyue Wei ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Urban Trees ◽  
Nox Removal ◽  
Removal Capacity ◽  
Isotope Method ◽  
Beijing China
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