Search Results for author: Ali Mostafavi

Found 27 papers, 5 papers with code

ELEV-VISION-SAM: Integrated Vision Language and Foundation Model for Automated Estimation of Building Lowest Floor Elevation

no code implementations19 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.

Image Segmentation object-detection +3

Machine Learning-based Approach for Ex-post Assessment of Community Risk and Resilience Based on Coupled Human-infrastructure Systems Performance

no code implementations24 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.

Rethinking Urban Flood Risk Assessment By Adapting Health Domain Perspective

no code implementations6 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.

Beyond Quantities: Machine Learning-based Characterization of Inequality in Infrastructure Quality Provision in Cities

no code implementations14 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.

Deep Learning-driven Community Resilience Rating based on Intertwined Socio-Technical Systems Features

no code implementations3 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.

Unraveling Fundamental Properties of Power System Resilience Curves using Unsupervised Machine Learning

no code implementations16 Oct 2023 Bo Li, Ali Mostafavi

Trapezoidal archetypes explain resilience curves based on 1. duration of sustained function loss and 2. constant recovery rate.

ML4EJ: Decoding the Role of Urban Features in Shaping Environmental Injustice Using Interpretable Machine Learning

no code implementations3 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.

Feature Importance Interpretable Machine Learning

Unsupervised Graph Deep Learning Reveals Emergent Flood Risk Profile of Urban Areas

no code implementations26 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.

MaxFloodCast: Ensemble Machine Learning Model for Predicting Peak Inundation Depth And Decoding Influencing Features

no code implementations11 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.

Management

FairMobi-Net: A Fairness-aware Deep Learning Model for Urban Mobility Flow Generation

no code implementations20 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.

Binary Classification Fairness +1

Decoding Urban-health Nexus: Interpretable Machine Learning Illuminates Cancer Prevalence based on Intertwined City Features

no code implementations20 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.

Causal Inference Interpretable Machine Learning

Graph Attention Networks Unveil Determinants of Intra- and Inter-city Health Disparity

no code implementations18 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.

Graph Attention

Attributed Network Embedding Model for Exposing COVID-19 Spread Trajectory Archetypes

no code implementations20 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.

Network Embedding

FMP: Toward Fair Graph Message Passing against Topology Bias

no code implementations8 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.

Contrastive Learning Fairness +1

A Spatial-temporal Graph Deep Learning Model for Urban Flood Nowcasting Leveraging Heterogeneous Community Features

no code implementations9 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.

Neural Embeddings of Urban Big Data Reveal Emergent Structures in Cities

no code implementations24 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.

Generalized Demographic Parity for Group Fairness

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.

Attribute Fairness

Predicting Road Flooding Risk with Machine Learning Approaches Using Crowdsourced Reports and Fine-grained Traffic Data

no code implementations30 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.

Management

Spatio-Temporal Graph Convolutional Networks for Road Network Inundation Status Prediction during Urban Flooding

no code implementations6 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).

Future prediction Management

Revealing Critical Characteristics of Mobility Patterns in New York City during the Onset of COVID-19 Pandemic

no code implementations3 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

Weakly-supervised Fine-grained Event Recognition on Social Media Texts for Disaster Management

1 code implementation4 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.

Management

Adaptive Reinforcement Learning Model for Simulation of Urban Mobility during Crises

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.

reinforcement-learning Reinforcement Learning (RL)

DeepCOVIDNet: An Interpretable Deep Learning Model for Predictive Surveillance of COVID-19 Using Heterogeneous Features and their Interactions

2 code implementations31 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.

Time Series Time Series Analysis

A Hybrid Deep Learning Model for Predictive Flood Warning and Situation Awareness using Channel Network Sensors Data

no code implementations15 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.

Time Series Analysis

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