Zihan Kan
Dados Biográficos
| ID | 234241 |
|---|---|
| NOME | Zihan Kan |
| PRENOMES | Zihan |
| SOBRENOME | Kan |
| ASSINATURA | KAN Z |
| AFILIAÇÕES | Chinese University of Hong Kong |
| ORCID | 0000-0002-6364-0537 |
| VERIFICADO | Sim |
| TOTAL DE OBRAS | 38 |
| TOTAL DE CITAÇÕES | 62 |
| TOTAL COMO AUTOR | 38 |
| TOTAL COMO EDITOR | 0 |
| PRIMEIRO ANO DE PUBLICAÇÃO | 2016 |
| ANO MAIS RECENTE DE PUBLICAÇÃO | 2026 |
| ÍNDICE H | 5 |
Examining dual exposure to traffic congestion and in-vehicle crowding among senior and regular cardholders using smart card data
In urban travel, traffic congestion often results in prolonged travel times, while in-vehicle crowding causes physical discomfort. Bus passengers uniquely face dual exposure to both congestion (from shared road networks) and crowding (from shared vehicle space), which compounds health risks and undermines sustainable transport goals. Despite this, few studies examine these concurrent exposures or the socio-demographic disparities in who bears thi…
A network-based approach to understand the risk of mobility-related social exclusion in spatiotemporal activities
This study proposes a novel network-based approach to understand the risk of mobility-related social exclusion (MRSE) in people's daily activities. Compared to existing approaches focusing on physical mobility and individual travel network, this study develops an integrated analysis method that considers both population-level mobility network and spatiotemporal dynamics of individual activity patterns. This method considers strong connections, fr…
Integrated AI framework combining routing, computer vision, and large language models to assess urban park access disparities among people with and without mobility impairments
Integrated transit service status assessment using smart transit card big data under the x-minute city framework
The x-minute city concept emphasizes the importance of residents being able to access locations of urban functions by active transportation modes within a short travel time. However, there are inevitably areas where active transportation modes like walking are insufficient to reach certain locations. In such cases, public transit plays a vital role in providing sustainable and healthy transportation options, especially for residents without cars.…
Real-time mobile sensing calibrated by random forest for spatiotemporal assessment of air pollution exposure distribution and inequality
Assessing the impact of socioeconomic and environmental factors on mental health during the Covid-19 pandemic based on GPS-enabled mobile sensing and survey data
Using spatially explicit high-granularity 3D geospatial data for quantifying public transport walking accessibility inequality and vulnerability in the x-minute city
A Trajectory Mining Framework for Exploring Individual Concurrent Environmental Exposure and Its Association with Mental Health
Uncovering travel communities among older and younger adults using smart card data
The proposal of a 15-minute city composite index through integrating GPS trajectory data-inferred urban function attraction based on the Bayesian framework
An adaptive OD flow clustering method to identify heterogeneous urban mobility trends
Measuring exposure and contribution of different types of activity travels to traffic congestion using GPS trajectory data
Development of a Chrono‐Urbanism Status Composite Index under the 5/10/15‐Minute City Concept Using Social Media Big Data
Developing walkable urban environments is crucial for enhancing urban liveability and sustainability. To evaluate the chrono‐urbanism status, this study combines conventional census and mapping data with social media check‐in big data. A composite index is proposed, which assesses the accessibility of essential urban functions under the 5/10/15‐minute chrono‐thresholds. This index incorporates five categories of urban functions (public transit, l…
Inter-relationships among individual views of Covid-19 control measures across multi-cultural contexts
A Spatial Network-Based Assessment of Individual Exposure to Covid-19
This study seeks to examine the possible impacts of sociodemographic factors, individual mobility patterns, and daily activities on individual exposure to COVID-19 risk when assessed by different risk measures. Taking Hong Kong as the study area, we first model the risk of COVID-19 using a density-based approach and a network-based approach and reveal the differences in the spatial distributions of COVID-19 transmission risk they obtained. Then, …
Spatial–Temporal Analysis of Vehicle Routing Problem from Online Car-Hailing Trajectories
With the advent of the information age and rapid population growth, the urban transportation environment is deteriorating. Travel-route planning is a key issue in modern sustainable transportation systems. When conducting route planning, identifying the spatiotemporal disparities between planned routes and the routes chosen by actual drivers, as well as their underlying reasons, is an important method for optimizing route planning. In this study,…
Inconsistent Association between Perceived Air Quality and Self-Reported Respiratory Symptoms
As public awareness of air quality issues becomes heightened, people's perception of air quality is drawing increasing academic interest. However, data about people's perceived environment need scrutiny before being used in environmental health studies. In this research, we examine the associations between people's perceptions of air quality and their self-reported respiratory health symptoms. Spearman rank correlation coefficients were estimated…
Perceiving noise in daily life
Nonstationary relationships among individuals’ concurrent exposures to noise, air pollution and greenspace
Individuals are often exposed to multiple environmental factors simultaneously. Understanding their joint effects is essential for developing effective public health policies. However, there has been a lack of research examining individuals' concurrent exposures to multiple environmental factors during people's daily mobility. To address this gap, this study investigated the relationships between and geographic patterns of individual exposures to…
Examining individual-level tri-exposure to greenspace and air/noise pollution using individual-level GPS-based real-time sensing data
Ripley’s K‐function for Network‐Constrained Flow Data
Many types of spatial flows, including pedestrian flows and vehicle flows, are constrained by and distribute on spatial networks. In the literature, network‐constrained flows are usually modeled as a direct line in planar space using methods designed for flows in planar space. Further, in spatial statistical analysis of flow patterns, distance measures and the hypothesis of spatial randomness of flows also have a significant impact on the determi…
Assessing job-access inequity for transit-based workers across space and race with the Palma ratio
This study examines the job-access inequity between the richest 10% and poorest 40% transit-based workers across space (i.e. central city, the inner-ring/outer-ring suburb) and race (i.e. white, black and Hispanic) in Chicago. The results indicate that there are job-access inequities across both space and race. In terms of job-access inequity across race, there are more job-access inequities for whites and blacks than for Hispanics. In terms of j…
Racial/Ethnic Inequity in Transit-Based Spatial Accessibility to Covid-19 Vaccination Sites
The Impact of Community Shuttle Services on Traffic and Traffic-Related Air Pollution
Community shuttle services have the potential to alleviate traffic congestion and reduce traffic pollution caused by massive short-distance taxi-hailing trips. However, few studies have evaluated and quantified the impact of community shuttle services on urban traffic and traffic-related air pollution. In this paper, we propose a complete framework to quantitatively assess the positive impacts of community shuttle services, including route design…
The Impacts of Housing Characteristics and Built-Environment Features on Mental Health
In this study, we examined the relationships between housing characteristics, neighborhood built-environment features, and people's mental health in Hong Kong, an Asian city well known for its high-density and high-rise housing. The potential mediating effects of people's perceived living environment were also considered in the analysis. We collected data from 221 participants from two communities in Hong Kong, i.e., Sham Shui Po (SSP) and Tin Sh…
Nonstationary relationships among individuals’ concurrent exposures to noise, air pollution and greenspace
Individuals are often exposed to multiple environmental factors simultaneously. Understanding their joint effects is essential for developing effective public health policies. However, there has been a lack of research examining individuals' concurrent exposures to multiple environmental factors during people's daily mobility. To address this gap, this study investigated the relationships between and geographic patterns of individual exposures to…
Examining individual-level tri-exposure to greenspace and air/noise pollution using individual-level GPS-based real-time sensing data
Assessing individual activity-related exposures to traffic congestion using GPS trajectory data
An integrated analysis of housing and transit affordability in the Chicago metropolitan area
An integrated analysis of housing and transport affordability provides comprehensive insights into the affordability of different locations in a city. By focusing on transit-based workers, who constitute a significant portion of commuters but are understudied in the affordability literature, this study proposes a new, integrated method for estimating housing and transit (H + T) affordability in the Chicago Metropolitan Area using census data and …
Perceiving noise in daily life
The superspreading places of Covid-19 and the associated built-environment and socio-demographic features
An adaptive OD flow clustering method to identify heterogeneous urban mobility trends
Analyzing disparities in transit‐based healthcare accessibility in the Chicago Metropolitan Area
Public transit is indispensable for car‐free households to access healthcare. Meanwhile, different households have unequal transit‐based healthcare accessibility due to different socio‐economic factors such as race/ethnicity and car ownership. Few studies have comprehensively explored the inequality in transit‐based healthcare accessibility by integrating both racial/ethnic inequity and car ownership. This study fills the gap with an up‐to‐date a…
Measuring exposure and contribution of different types of activity travels to traffic congestion using GPS trajectory data
Assessing the impact of socioeconomic and environmental factors on mental health during the Covid-19 pandemic based on GPS-enabled mobile sensing and survey data
Using spatially explicit high-granularity 3D geospatial data for quantifying public transport walking accessibility inequality and vulnerability in the x-minute city
Integrated transit service status assessment using smart transit card big data under the x-minute city framework
The x-minute city concept emphasizes the importance of residents being able to access locations of urban functions by active transportation modes within a short travel time. However, there are inevitably areas where active transportation modes like walking are insufficient to reach certain locations. In such cases, public transit plays a vital role in providing sustainable and healthy transportation options, especially for residents without cars.…
Inter-relationships among individual views of Covid-19 control measures across multi-cultural contexts
A Spatial Network-Based Assessment of Individual Exposure to Covid-19
This study seeks to examine the possible impacts of sociodemographic factors, individual mobility patterns, and daily activities on individual exposure to COVID-19 risk when assessed by different risk measures. Taking Hong Kong as the study area, we first model the risk of COVID-19 using a density-based approach and a network-based approach and reveal the differences in the spatial distributions of COVID-19 transmission risk they obtained. Then, …
Inter‐ and intra‐racial/ethnic disparities in walking accessibility to grocery stores
Inequalities in accessibility to grocery stores can lead to disparate health outcomes among the population. Although existing studies have examined grocery accessibility inequality across income and racial/ethnic groups, little research has been dedicated to revealing the intra‐racial disparities of grocery accessibility and comparing inter‐racial and intra‐racial inequalities in grocery accessibility. This study adopts a modified two‐step floati…
Travel time estimation at intersections based on low-frequency spatial-temporal GPS trajectory big data
Intersections are the critical parts where different traffic flows converge and change directions, forming "bottlenecks" and "clog points" in urban traffic. Intersection travel time is an important parameter for public route planning, traffic management, and engineering optimization. Based on low-frequency spatial-temporal Global Positioning System (GPS) trace data, this article presents a novel method for estimating intersection travel time. The…
Estimating Vehicle Fuel Consumption and Emissions Using GPS Big Data
The energy consumption and emissions from vehicles adversely affect human health and urban sustainability. Analysis of GPS big data collected from vehicles can provide useful insights about the quantity and distribution of such energy consumption and emissions. Previous studies, which estimated fuel consumption/emissions from traffic based on GPS sampled data, have not sufficiently considered vehicle activities and may have led to erroneous estim…
Spatiotemporal Analysis of Taxi-Driver Shifts Using Big Trace Data
In taxi management, taxi-driver shift behaviors play a key role in arranging the operation of taxis, which affect the balance between the demand and supply of taxis and the parking spaces. At the same time, these behaviors influence the daily travel of citizens. An analysis of the distribution of taxi-driver shifts, therefore, contributes to transportation management. Compared to the previous research using the real shift records, this study focu…
Investigating the Relationship between the Built Environment and Relative Risk of Covid-19 in Hong Kong
Understanding the relationship between the built environment and the risk of COVID-19 transmission is essential to respond to the pandemic. This study explores the relationship between the built environment and COVID-19 risk using the confirmed cases data collected in Hong Kong. Using the information on the residential buildings and places visited for each case from the dataset, we assess the risk of COVID-19 and explore their geographic patterns…
Understanding space-time patterns of vehicular emission flows in urban areas using geospatial technique
Analysis of urban green space accessibility and distribution inequity in the City of Chicago
Covid-19 Infection and Mortality
The novel coronavirus disease (COVID-19) has become a public health problem at a global scale because of its high infection and mortality rate. It has affected most countries in the world, and the number of confirmed cases and death toll is still growing rapidly. Susceptibility studies have been conducted in specific countries, where COVID-19 infection and mortality rates were highly related to demographics and air pollution, especially PM2.5, bu…
Modelling Place Visit Probability Sequences during Trajectory Data Gaps Based on Movement History
The acquisition of human trajectories facilitates movement data analytics and location-based services, but gaps in trajectories limit the extent in which many tracking datasets can be utilized. We present a model to estimate place visit probabilities at time points within a gap, based on empirical mobility patterns derived from past trajectories. Different from previous models, our model makes use of prior information from historical data to buil…
The superspreading places of Covid-19 and the associated built-environment and socio-demographic features
Assessing individual activity-related exposures to traffic congestion using GPS trajectory data
An integrated analysis of housing and transit affordability in the Chicago metropolitan area
An integrated analysis of housing and transport affordability provides comprehensive insights into the affordability of different locations in a city. By focusing on transit-based workers, who constitute a significant portion of commuters but are understudied in the affordability literature, this study proposes a new, integrated method for estimating housing and transit (H + T) affordability in the Chicago Metropolitan Area using census data and …
Ripley’s K‐function for Network‐Constrained Flow Data
Many types of spatial flows, including pedestrian flows and vehicle flows, are constrained by and distribute on spatial networks. In the literature, network‐constrained flows are usually modeled as a direct line in planar space using methods designed for flows in planar space. Further, in spatial statistical analysis of flow patterns, distance measures and the hypothesis of spatial randomness of flows also have a significant impact on the determi…
Assessing job-access inequity for transit-based workers across space and race with the Palma ratio
This study examines the job-access inequity between the richest 10% and poorest 40% transit-based workers across space (i.e. central city, the inner-ring/outer-ring suburb) and race (i.e. white, black and Hispanic) in Chicago. The results indicate that there are job-access inequities across both space and race. In terms of job-access inequity across race, there are more job-access inequities for whites and blacks than for Hispanics. In terms of j…
Racial/Ethnic Inequity in Transit-Based Spatial Accessibility to Covid-19 Vaccination Sites
The Impact of Community Shuttle Services on Traffic and Traffic-Related Air Pollution
Community shuttle services have the potential to alleviate traffic congestion and reduce traffic pollution caused by massive short-distance taxi-hailing trips. However, few studies have evaluated and quantified the impact of community shuttle services on urban traffic and traffic-related air pollution. In this paper, we propose a complete framework to quantitatively assess the positive impacts of community shuttle services, including route design…
The Impacts of Housing Characteristics and Built-Environment Features on Mental Health
In this study, we examined the relationships between housing characteristics, neighborhood built-environment features, and people's mental health in Hong Kong, an Asian city well known for its high-density and high-rise housing. The potential mediating effects of people's perceived living environment were also considered in the analysis. We collected data from 221 participants from two communities in Hong Kong, i.e., Sham Shui Po (SSP) and Tin Sh…
Analyzing disparities in transit‐based healthcare accessibility in the Chicago Metropolitan Area
Public transit is indispensable for car‐free households to access healthcare. Meanwhile, different households have unequal transit‐based healthcare accessibility due to different socio‐economic factors such as race/ethnicity and car ownership. Few studies have comprehensively explored the inequality in transit‐based healthcare accessibility by integrating both racial/ethnic inequity and car ownership. This study fills the gap with an up‐to‐date a…
Inter‐ and intra‐racial/ethnic disparities in walking accessibility to grocery stores
Inequalities in accessibility to grocery stores can lead to disparate health outcomes among the population. Although existing studies have examined grocery accessibility inequality across income and racial/ethnic groups, little research has been dedicated to revealing the intra‐racial disparities of grocery accessibility and comparing inter‐racial and intra‐racial inequalities in grocery accessibility. This study adopts a modified two‐step floati…
Spatial–Temporal Analysis of Vehicle Routing Problem from Online Car-Hailing Trajectories
With the advent of the information age and rapid population growth, the urban transportation environment is deteriorating. Travel-route planning is a key issue in modern sustainable transportation systems. When conducting route planning, identifying the spatiotemporal disparities between planned routes and the routes chosen by actual drivers, as well as their underlying reasons, is an important method for optimizing route planning. In this study,…
Inconsistent Association between Perceived Air Quality and Self-Reported Respiratory Symptoms
As public awareness of air quality issues becomes heightened, people's perception of air quality is drawing increasing academic interest. However, data about people's perceived environment need scrutiny before being used in environmental health studies. In this research, we examine the associations between people's perceptions of air quality and their self-reported respiratory health symptoms. Spearman rank correlation coefficients were estimated…
Perceiving noise in daily life
Nonstationary relationships among individuals’ concurrent exposures to noise, air pollution and greenspace
Individuals are often exposed to multiple environmental factors simultaneously. Understanding their joint effects is essential for developing effective public health policies. However, there has been a lack of research examining individuals' concurrent exposures to multiple environmental factors during people's daily mobility. To address this gap, this study investigated the relationships between and geographic patterns of individual exposures to…
Examining individual-level tri-exposure to greenspace and air/noise pollution using individual-level GPS-based real-time sensing data
Uncovering travel communities among older and younger adults using smart card data
The proposal of a 15-minute city composite index through integrating GPS trajectory data-inferred urban function attraction based on the Bayesian framework
Computer Science (22 obras) · Geography (22 obras) · Urban Transport and Accessibility (19 obras) · Medicine (15 obras) · Engineering (13 obras) · Human Mobility and Location-Based Analysis (12 obras) · Mathematics (12 obras) · Transportation Planning and Optimization (12 obras) · Transport engineering (11 obras) · Environmental health (10 obras)