Search Results for author: SongNam Hong

Found 8 papers, 0 papers with code

Asymptotically Near-Optimal Hybrid Beamforming for mmWave IRS-Aided MIMO Systems

no code implementations14 Mar 2024 Jeongjae Lee, SongNam Hong

Thus, it is required to jointly optimize a reflection vector and hybrid beamforming matrices for IRS-aided mmWave MIMO systems.

Near-Field Channel Estimation for XL-RIS Assisted Multi-User XL-MIMO Systems: Hybrid Beamforming Architectures

no code implementations13 Jan 2024 Jeongjae Lee, Hyeongjin Chung, Yunseong Cho, Sunwoo Kim, SongNam Hong

In this paper, we study the channel estimation problem for XL-RIS assisted multi-user XL-MIMO systems with hybrid beamforming structures.

On Practical Robust Reinforcement Learning: Practical Uncertainty Set and Double-Agent Algorithm

no code implementations11 May 2023 Ukjo Hwang, SongNam Hong

Robust reinforcement learning (RRL) aims at seeking a robust policy to optimize the worst case performance over an uncertainty set of Markov decision processes (MDPs).

Q-Learning reinforcement-learning +1

Tighter Regret Analysis and Optimization of Online Federated Learning

no code implementations13 May 2022 Dohyeok Kwon, Jonghwan Park, SongNam Hong

In federated learning (FL), it is commonly assumed that all data are placed at clients in the beginning of machine learning (ML) optimization (i. e., offline learning).

Federated Learning Quantization

Distributed Online Learning with Multiple Kernels

no code implementations25 Feb 2021 Jeongmin Chae, SongNam Hong

We consider the problem of learning a nonlinear function over a network of learners in a fully decentralized fashion.

Federated Learning Time Series +1

Multiple Kernel-Based Online Federated Learning

no code implementations22 Feb 2021 Jeongmin Chae, SongNam Hong

Online federated learning (OFL) becomes an emerging learning framework, in which edge nodes perform online learning with continuous streaming local data and a server constructs a global model from the aggregated local models.

Federated Learning

Distributed Online Learning with Multiple Kernels

no code implementations17 Nov 2020 Jeongmin Chae, SongNam Hong

Learning a function from such data is of great interest in machine learning tasks for IoT systems.

Privacy Preserving Time Series +1

Pool-based sequential active learning with multi kernels

no code implementations22 Oct 2020 Jeongmin Chae, SongNam Hong

We study a pool-based sequential active learning (AL), in which one sample is queried at each time from a large pool of unlabeled data according to a selection criterion.

Active Learning

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