no code implementations • 19 Apr 2024 • Yu-Hsuan Ho, Longxiang Li, Ali Mostafavi
By evaluating various vision language models, integration methods, and text prompts, we identify the most suitable model for street view image analytics and LFE estimation tasks, thereby improving the availability of the current LFE estimation model based on image segmentation from 33% to 56% of properties.
no code implementations • 24 Mar 2024 • Xiangpeng Li, Ali Mostafavi
To address this gap, in this study we created a machine learning-based method for the ex-post assessment of community risk and resilience and their interplay based on features related to the coupled human-infrastructure systems performance.
no code implementations • 6 Mar 2024 • Zhewei Liu, Kai Yin, Ali Mostafavi
The proposed perspective focuses on three pillars for examining flood risk: (1) inherent susceptibility, (2) mitigation strategies, and (3) external stressors.
no code implementations • 14 Feb 2024 • Bo Li, Ali Mostafavi
While a growing of body of literature has recognized the importance of characterizing infrastructure inequality in cities and provided quantified metrics to inform urban development plans, the majority of the existing approaches focus primarily on measuring the quantity of infrastructure, assuming that more infrastructure is better.
1 code implementation • 19 Dec 2023 • Zhimeng Jiang, Xiaotian Han, Chao Fan, Zirui Liu, Na Zou, Ali Mostafavi, Xia Hu
To this end, we aim to achieve fairness via a new GNN architecture.
no code implementations • 3 Nov 2023 • Kai Yin, Ali Mostafavi
The interpretability of the model outcomes enables feature analysis for specifying the determinants of resilience in areas within each resilience level, allowing for the identification of specific resilience enhancement strategies.
no code implementations • 16 Oct 2023 • Bo Li, Ali Mostafavi
Trapezoidal archetypes explain resilience curves based on 1. duration of sustained function loss and 2. constant recovery rate.
no code implementations • 3 Oct 2023 • Yu-Hsuan Ho, Zhewei Liu, Cheng-Chun Lee, Ali Mostafavi
The insights gleaned from this study offer fresh perspectives on the relationship among urban features and their interplay with environmental hazard exposure disparities, informing the development of more integrated urban design policies to enhance social equity and environmental injustice issues.
no code implementations • 26 Sep 2023 • Kai Yin, Ali Mostafavi
Urban flood risk emerges from complex and nonlinear interactions among multiple features related to flood hazard, flood exposure, and social and physical vulnerabilities, along with the complex spatial flood dependence relationships.
no code implementations • 11 Aug 2023 • Cheng-Chun Lee, Lipai Huang, Federico Antolini, Matthew Garcia, Andrew Juanb, Samuel D. Brody, Ali Mostafavi
Timely, accurate, and reliable information is essential for decision-makers, emergency managers, and infrastructure operators during flood events.
no code implementations • 20 Jul 2023 • Zhewei Liu, Lipai Huang, Chao Fan, Ali Mostafavi
Generating realistic human flows across regions is essential for our understanding of urban structures and population activity patterns, enabling important applications in the fields of urban planning and management.
no code implementations • 20 Jun 2023 • Chenyue Liu, Ali Mostafavi
We further explore urban development and design strategies that could mitigate cancer prevalence, focusing on green space, developed areas, and total emissions.
no code implementations • 5 Jun 2023 • Yu-Hsuan Ho, Cheng-Chun Lee, Nicholas D. Diaz, Samuel D. Brody, Ali Mostafavi
The depth from the camera to the door bottom was obtained from the depthmap paired with the Google Street View image.
no code implementations • 18 Oct 2022 • Chenyue Liu, Chao Fan, Ali Mostafavi
Understanding the determinants underlying variations in urban health status is important for informing urban design and planning, as well as public health policies.
no code implementations • 20 Sep 2022 • Junwei Ma, Bo Li, Qingchun Li, Chao Fan, Ali Mostafavi
To this end, this study creates a network embedding model capturing cross-county visitation networks, as well as heterogeneous features to uncover clusters of counties in the United States based on their pandemic spread transmission trajectories.
1 code implementation • 3 Aug 2022 • Navjot Kaur, Cheng-Chun Lee, Ali Mostafavi, Ali Mahdavi-Amiri
In this work, a novel transformer-based network is proposed for assessing building damage.
no code implementations • 8 Feb 2022 • Zhimeng Jiang, Xiaotian Han, Chao Fan, Zirui Liu, Na Zou, Ali Mostafavi, Xia Hu
Despite recent advances in achieving fair representations and predictions through regularization, adversarial debiasing, and contrastive learning in graph neural networks (GNNs), the working mechanism (i. e., message passing) behind GNNs inducing unfairness issue remains unknown.
no code implementations • 9 Nov 2021 • Hamed Farahmand, Yuanchang Xu, Ali Mostafavi
We present a new computational modeling framework including an attention-based spatial-temporal graph convolution network (ASTGCN) model and different streams of data that are collected in real-time, preprocessed, and fed into the model to consider spatial and temporal information and dependencies that improve flood nowcasting.
no code implementations • 24 Oct 2021 • Chao Fan, Yang Yang, Ali Mostafavi
In this study, we propose using a neural embedding model-graph neural network (GNN)- that leverages the heterogeneous features of urban areas and their interactions captured by human mobility network to obtain vector representations of these areas.
1 code implementation • ICLR 2022 • Zhimeng Jiang, Xiaotian Han, Chao Fan, Fan Yang, Ali Mostafavi, Xia Hu
We show the understanding of GDP from the probability perspective and theoretically reveal the connection between GDP regularizer and adversarial debiasing.
no code implementations • 30 Aug 2021 • Faxi Yuan, William Mobley, Hamed Farahmand, Yuanchang Xu, Russell Blessing, Shangjia Dong, Ali Mostafavi, Samuel D. Brody
The objective of this study is to predict road flooding risks based on topographic, hydrologic, and temporal precipitation features using machine learning models.
no code implementations • 6 Apr 2021 • Faxi Yuan, Yuanchang Xu, Qingchun Li, Ali Mostafavi
Using fine-grained traffic speed data related to road sections, this study designed and implemented three spatio-temporal graph convolutional network (STGCN) models to predict road network status during flood events at the road segment level in the context of the 2017 Hurricane Harvey in Harris County (Texas, USA).
no code implementations • 3 Feb 2021 • Akhil Anil Rajput, Qingchun Li, Xinyu Gao, Ali Mostafavi
Using data sources related to population density, aggregated population mobility, public rail transit use, vehicle use, hotspot and non-hotspot movement patterns, and human activity agglomeration, we analyzed the inter-borough and intra-borough moment for New York City by aggregating the data at the borough level.
Physics and Society Social and Information Networks
1 code implementation • 4 Oct 2020 • Wenlin Yao, Cheng Zhang, Shiva Saravanan, Ruihong Huang, Ali Mostafavi
People increasingly use social media to report emergencies, seek help or share information during disasters, which makes social networks an important tool for disaster management.
no code implementations • Physics and Society (physics.soc-ph); Computers and Society (cs.CY) 2020 • Chao Fan, Xiangqi Jiang, Ali Mostafavi
The objective of this study is to propose and test an adaptive reinforcement learning model that can learn the patterns of human mobility in a normal context and simulate the mobility during perturbations caused by crises, such as flooding, wildfire, and hurricanes.
2 code implementations • 31 Jul 2020 • Ankit Ramchandani, Chao Fan, Ali Mostafavi
In this paper, we propose a deep learning model to forecast the range of increase in COVID-19 infected cases in future days and we present a novel method to compute equidimensional representations of multivariate time series and multivariate spatial time series data.
no code implementations • 15 Jun 2020 • Shangjia Dong, Tianbo Yu, Hamed Farahmand, Ali Mostafavi
The objective of this study is to create and test a hybrid deep learning model, FastGRNN-FCN (Fast, Accurate, Stable and Tiny Gated Recurrent Neural Network-Fully Convolutional Network), for urban flood prediction and situation awareness using channel network sensors data.