Search Results for author: Hyung Ju Hwang

Found 23 papers, 2 papers with code

Estimating the Distribution of Parameters in Differential Equations with Repeated Cross-Sectional Data

no code implementations23 Apr 2024 Hyeontae Jo, Sung Woong Cho, Hyung Ju Hwang

With RCS data, we found that traditional methods for parameter estimation in differential equations, such as using mean values of time trajectories or Gaussian Process-based trajectory generation, have limitations in estimating the shape of parameter distributions, often leading to a significant loss of data information.

Time Series

Sobolev Training for Operator Learning

no code implementations14 Feb 2024 Namkyeong Cho, Junseung Ryu, Hyung Ju Hwang

This study investigates the impact of Sobolev Training on operator learning frameworks for improving model performance.

Operator learning

Learning time-dependent PDE via graph neural networks and deep operator network for robust accuracy on irregular grids

no code implementations13 Feb 2024 Sung Woong Cho, Jae Yong Lee, Hyung Ju Hwang

There has been growing interest in models that learn the operator from the parameters of a partial differential equation (PDE) to the corresponding solutions.

Operator learning

HyperDeepONet: learning operator with complex target function space using the limited resources via hypernetwork

no code implementations26 Dec 2023 Jae Yong Lee, Sung Woong Cho, Hyung Ju Hwang

This study proposes HyperDeepONet, which uses the expressive power of the hypernetwork to enable the learning of a complex operator with a smaller set of parameters.

Operator learning

opPINN: Physics-Informed Neural Network with operator learning to approximate solutions to the Fokker-Planck-Landau equation

no code implementations5 Jul 2022 Jae Yong Lee, Juhi Jang, Hyung Ju Hwang

We propose a hybrid framework opPINN: physics-informed neural network (PINN) with operator learning for approximating the solution to the Fokker-Planck-Landau (FPL) equation.

Operator learning

Enhanced Physics-Informed Neural Networks with Augmented Lagrangian Relaxation Method (AL-PINNs)

1 code implementation29 Apr 2022 Hwijae Son, Sung Woong Cho, Hyung Ju Hwang

By employing Augmented Lagrangian relaxation, the constrained optimization problem becomes a sequential max-min problem so that the learnable parameters $\lambda$ adaptively balance each loss component.

Pseudo-Differential Neural Operator: Generalized Fourier Neural Operator for Learning Solution Operators of Partial Differential Equations

1 code implementation28 Jan 2022 Jin Young Shin, Jae Yong Lee, Hyung Ju Hwang

We combine the PDIO with the neural operator to develop a \textit{pseudo-differential neural operator} (PDNO) and learn the nonlinear solution operator of PDEs.

Solving PDE-constrained Control Problems Using Operator Learning

no code implementations9 Nov 2021 Rakhoon Hwang, Jae Yong Lee, Jin Young Shin, Hyung Ju Hwang

Once the surrogate model is trained in Phase 1, the optimal control can be inferred in Phase 2 without intensive computations.

Operator learning

Machine Learning-Based COVID-19 Patients Triage Algorithm using Patient-Generated Health Data from Nationwide Multicenter Database

no code implementations18 Sep 2021 Min Sue Park, Hyeontae Jo, Haeun Lee, Se Young Jung, Hyung Ju Hwang

The prompt severity assessment model for managing infectious people has been attained through using a nationwide dataset.

Lagrangian dual framework for conservative neural network solutions of kinetic equations

no code implementations23 Jun 2021 Hyung Ju Hwang, Hwijae Son

In this paper, we propose a novel conservative formulation for solving kinetic equations via neural networks.

Prior Preference Learning from Experts:Designing a Reward with Active Inference

no code implementations22 Jan 2021 Jin Young Shin, Cheolhyeong Kim, Hyung Ju Hwang

In this paper, we claim that active inference can be interpreted using reinforcement learning (RL) algorithms and find a theoretical connection between them.

Reinforcement Learning (RL)

Traveling Wave Solutions of Partial Differential Equations via Neural Networks

no code implementations21 Jan 2021 Sung Woong Cho, Hyung Ju Hwang, Hwijae Son

This paper focuses on how to approximate traveling wave solutions for various kinds of partial differential equations via artificial neural networks.

Numerical Analysis Numerical Analysis Analysis of PDEs

Sobolev Training for the Neural Network Solutions of PDEs

no code implementations1 Jan 2021 Hwijae Son, Jin Woo Jang, Woo Jin Han, Hyung Ju Hwang

Inspired by the recent studies that incorporate derivative information for the training of neural networks, we develop a loss function that guides a neural network to reduce the error in the corresponding Sobolev space.

Prior Preference Learning From Experts: Designing A Reward with Active Inference

no code implementations1 Jan 2021 Jin Young Shin, Cheolhyeong Kim, Hyung Ju Hwang

In this paper, we claim that active inference can be interpreted using reinforcement learning (RL) algorithms and find a theoretical connection between them.

Reinforcement Learning (RL)

The model reduction of the Vlasov-Poisson-Fokker-Planck system to the Poisson-Nernst-Planck system via the Deep Neural Network Approach

no code implementations28 Sep 2020 Jae Yong Lee, Jin Woo Jang, Hyung Ju Hwang

The model reduction of a mesoscopic kinetic dynamics to a macroscopic continuum dynamics has been one of the fundamental questions in mathematical physics since Hilbert's time.

Trend to Equilibrium for the Kinetic Fokker-Planck Equation via the Neural Network Approach

no code implementations22 Nov 2019 Hyung Ju Hwang, Jin Woo Jang, Hyeontae Jo, Jae Yong Lee

The issue of the relaxation to equilibrium has been at the core of the kinetic theory of rarefied gas dynamics.

Friction

Option Compatible Reward Inverse Reinforcement Learning

no code implementations7 Nov 2019 Rakhoon Hwang, Hanjin Lee, Hyung Ju Hwang

In this paper, we solve a hierarchical inverse reinforcement learning problem within the options framework, which allows us to utilize intrinsic motivation of the expert demonstrations.

reinforcement-learning Reinforcement Learning (RL) +1

White Box Network: Obtaining a right composition ordering of functions

no code implementations25 Sep 2019 Eun saem Lee, Hyung Ju Hwang

The universality of a neural network enables the approximation of any type of continuous functions.

NEAR: Neighborhood Edge AggregatoR for Graph Classification

no code implementations6 Sep 2019 Cheolhyeong Kim, Haeseong Moon, Hyung Ju Hwang

However, past GNN algorithms based on 1-hop neighborhood neural message passing are exposed to a risk of loss of information on local structures and relationships.

General Classification Graph Classification

Deep Neural Network Approach to Forward-Inverse Problems

no code implementations27 Jul 2019 Hyeontae Jo, Hwijae Son, Hyung Ju Hwang, Eunheui Kim

That is, we provide a unified framework of DNN architecture that approximates an analytic solution and its model parameters simultaneously.

Local Stability and Performance of Simple Gradient Penalty $\mu$-Wasserstein GAN

no code implementations ICLR 2019 Cheolhyeong Kim, Seungtae Park, Hyung Ju Hwang

Wasserstein GAN(WGAN) is a model that minimizes the Wasserstein distance between a data distribution and sample distribution.

Local Stability and Performance of Simple Gradient Penalty mu-Wasserstein GAN

no code implementations5 Oct 2018 Cheolhyeong Kim, Seungtae Park, Hyung Ju Hwang

Wasserstein GAN(WGAN) is a model that minimizes the Wasserstein distance between a data distribution and sample distribution.

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