Search Results for author: Seongjin Choi

Found 12 papers, 1 papers with code

A Real-time Evaluation Framework for Pedestrian's Potential Risk at Non-Signalized Intersections Based on Predicted Post-Encroachment Time

no code implementations24 Apr 2024 Tengfeng Lin, Zhixiong Jin, Seongjin Choi, Hwasoo Yeo

To address these research challenges, in this study, a framework with computer vision technologies and predictive models is developed to evaluate the potential risk of pedestrians in real time.

Better Batch for Deep Probabilistic Time Series Forecasting

no code implementations26 May 2023 Vincent Zhihao Zheng, Seongjin Choi, Lijun Sun

Our method constructs a mini-batch as a collection of $D$ consecutive time series segments for model training.

Decision Making Probabilistic Time Series Forecasting +2

Enhancing Deep Traffic Forecasting Models with Dynamic Regression

no code implementations17 Jan 2023 Vincent Zhihao Zheng, Seongjin Choi, Lijun Sun

A common assumption in deep learning-based multivariate and multistep traffic time series forecasting models is that residuals are independent, isotropic, and uncorrelated in space and time.

regression Time Series +1

Scalable Dynamic Mixture Model with Full Covariance for Probabilistic Traffic Forecasting

no code implementations10 Dec 2022 Seongjin Choi, Nicolas Saunier, Vincent Zhihao Zheng, Martin Trepanier, Lijun Sun

Deep learning-based multivariate and multistep-ahead traffic forecasting models are typically trained with the mean squared error (MSE) or mean absolute error (MAE) as the loss function in a sequence-to-sequence setting, simply assuming that the errors follow an independent and isotropic Gaussian or Laplacian distributions.

Optimal Parking Planning for Shared Autonomous Vehicles

no code implementations7 Aug 2022 Seongjin Choi, Jinwoo Lee

Two specific planning scenarios are considered for the APPM: (i) Single-zone APPM (S-APPM), which considers the target area as a single homogeneous zone, and (ii) Two-zone APPM (T-APPM), which considers the target area as two different zones, such as city center and suburban area.

Autonomous Vehicles

A Framework for Pedestrian Sub-classification and Arrival Time Prediction at Signalized Intersection Using Preprocessed Lidar Data

no code implementations15 Jan 2022 Tengfeng Lin, Zhixiong Jin, Seongjin Choi, Hwasoo Yeo

The mortality rate for pedestrians using wheelchairs was 36% higher than the overall population pedestrian mortality rate.

Deep Learning based Urban Vehicle Trajectory Analytics

no code implementations15 Nov 2021 Seongjin Choi

In this dissertation, we focus on the `urban vehicle trajectory,' which refers to trajectories of vehicles in urban traffic networks, and we focus on `urban vehicle trajectory analytics.'

Development of Safety Monitoring System of Connected and Automated Vehicles considering the Trade-off between Communication Efficiency and Data Reliability

no code implementations25 Sep 2021 Sehyun Tak, Seongjin Choi

Thus, raw data must be sampled to reduce the size of the data over communication network and transmitted to the server for further processing.

Development of Simulation-based Lane Change Control System for Autonomous Vehicles

no code implementations12 Aug 2021 Seongjin Choi

However, since many of the current lane-changing decision algorithms of autonomous vehicles are based on the human driver model, it is hard to know the potential traffic impact of such lane change.

Autonomous Vehicles Decision Making

Transformer-based Map Matching Model with Limited Ground-Truth Data using Transfer-Learning Approach

no code implementations1 Aug 2021 Zhixiong Jin, Jiwon Kim, Hwasoo Yeo, Seongjin Choi

In many spatial trajectory-based applications, it is necessary to map raw trajectory data points onto road networks in digital maps, which is commonly referred to as a map-matching process.

Transfer Learning

TrajGAIL: Generating Urban Vehicle Trajectories using Generative Adversarial Imitation Learning

1 code implementation28 Jul 2020 Seongjin Choi, Jiwon Kim, Hwasoo Yeo

A generative model for urban vehicle trajectories can better generalize from training data by learning the underlying distribution of the training data and, thus, produce synthetic vehicle trajectories similar to real vehicle trajectories with limited observations.

Imitation Learning

Attention-based Recurrent Neural Network for Urban Vehicle Trajectory Prediction

no code implementations18 Dec 2018 Seongjin Choi, Jiwon Kim, Hwasoo Yeo

With the increasing deployment of diverse positioning devices and location-based services, a huge amount of spatial and temporal information has been collected and accumulated as trajectory data.

Trajectory Prediction

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