no code implementations • 24 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.
no code implementations • 26 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.
no code implementations • 17 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.
no code implementations • 10 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.
no code implementations • 7 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.
no code implementations • 15 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.
no code implementations • 15 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.'
no code implementations • 25 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.
no code implementations • 12 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.
no code implementations • 1 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.
1 code implementation • 28 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.
no code implementations • 18 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.