Redai dili (Dec 2023)
Assessment of Urban Dynamic Accessibility of the Stroke Emergency Network: A Case Study of Hefei
Abstract
Accessibility is one of the effective methods to measure whether the spatial layout of public service facilities is effective. However, traditional accessibility research often ignores urban dynamics and the issues with overall accessibility when there are multiple types of facilities. This study focused on Hefei and used dynamic data from sources such as transportation, ambulances, and stroke centers to build a dynamic stroke emergency network integrating the services of "the community, emergency medical center, ambulance, and stroke center." Baidu's map API (Application Programming Interface) was used to estimate the dynamic traffic cost at six important moments of one day. Lorentz curve and Gini coefficient were used to measure the spatial equity of overall accessibility. A systematic analysis was performed to evaluate the changes in dynamic accessibility and spatial equity at different times of a day. The results reveal the following. (1) The overall accessibility in Hefei has reached the golden "1-hour" service standard. More than 75% of the communities had a travel time of less than 30 minutes. However, excessive emergency resources are concentrated in the city center; this is ill-matched to the development and population needs. The communities with travel times more than 60 minutes were mainly distributed in the northern part of the Hefei Economic and Technological Development Area and the west side of Shushan Area. These areas are remote, with inconvenient transportation and are very far from emergency centers and stroke hospitals. (2) The accessibility of the emergency network fluctuates greatly with time, and the accessibility during the morning and evening peak periods are mainly affected by traffic flow. Compared to the peak period, the accessibility fluctuation during the off-peak period is generally smaller. However, the dynamic adjustment of ambulance resources in the day and evening shift in Hefei did not have a huge impact on the accessibility of the overall emergency network. (3) The overall accessibility of the stroke emergency network in Hefei is poorly balanced. The two times of the day with the best and worst overall spatial layout are at 8:00 and 22:00, respectively. In the study of time-sensitive accessibility to first-aid during a stroke, the results of the proposed high-precision first-aid network model and the time-varying accessibility estimation method are more accurate and reliable. Baidu map API is suitable for the computation of the origin to destination travel costs when using road networks. Therefore, to improve the precision and effectiveness of the accessibility estimation results, while studying the accessibility of first-aid for stroke in urban areas, it is necessary to consider the influence of dynamic factors such as traffic flow and the opening time of facilities and the overall accessibility of the service system which comprises multiple types of facilities.
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