Hyeonjin Kim

College of Engineering

Works (10)

Updated: July 26th, 2025 05:04

2025 article

An Optimization-Based HVAC Load and PV Disaggregation Methodology With Contextual Supervision

Kim, H., Yu, M. G., Wu, D., & Lu, N. (2025, April 24). IEEE Transactions on Smart Grid, Vol. 16, pp. 3457–3460.

By: H. Kim n, M. Yu *, D. Wu * & N. Lu n 

author keywords: HVAC; Dictionaries; Load modeling; Estimation; Accuracy; Vectors; Training; Optimization; Market research; Data mining; Load disaggregation; optimization-based source separation
topics (OpenAlex): Smart Grid Energy Management; Building Energy and Comfort Optimization
Sources: Web Of Science, ORCID, NC State University Libraries
Added: April 24, 2025

2025 article

ViT4LPA: A Vision Transformer for advanced smart meter Load Profile Analysis

Kim, H., Hu, Y., Ye, K., & Lu, N. (2025, January 7). Applied Energy, Vol. 382.

By: H. Kim n, Y. Hu n , K. Ye n & N. Lu n 

author keywords: Pre-trained models; Self-supervised learning; Load disaggregation; Vision transformer; Smart meter; Machine learning
topics (OpenAlex): Smart Grid Energy Management; Industrial Vision Systems and Defect Detection; Image Enhancement Techniques
UN Sustainable Development Goals Color Wheel
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (Web of Science; OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: January 7, 2025

2024 journal article

A Contextually Supervised Optimization-Based HVAC Load Disaggregation Methodology

IEEE Transactions on Smart Grid, 15(4), 3852–3863.

By: H. Kim n, K. Ye n, D. Lee * & N. Lu n 

author keywords: HVAC; Optimization; Hidden Markov models; Estimation; Load modeling; Dictionaries; Smart meters; Load disaggregation; non-intrusive load monitoring; optimization-based blind source separation; contextual supervision
topics (OpenAlex): Building Energy and Comfort Optimization; Smart Grid Energy Management; Energy Load and Power Forecasting
UN Sustainable Development Goals Color Wheel
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries, Crossref
Added: July 8, 2024

2024 article proceedings

A Novel Vision Transformer based Load Profile Analysis using Load Images as Inputs

By: H. Kim n, Y. Hu n , K. Ye n & N. Lu n 

author keywords: Image processing; Load analysis; Pre-trained model; Smart meter data; Vision transformer
topics (OpenAlex): Industrial Vision Systems and Defect Detection; Advanced Measurement and Detection Methods; Optical measurement and interference techniques
UN Sustainable Development Goals Color Wheel
UN Sustainable Development Goal Categories
Sources: Web Of Science, Crossref, NC State University Libraries
Added: February 25, 2025

2024 article

Applying fine-tuned LLMs for reducing data needs in load profile analysis

Hu, Y., Kim, H., Ye, K., & Lu, N. (2024, October 12). Applied Energy, Vol. 377.

By: Y. Hu* , H. Kim*, K. Ye* & N. Lu* 

author keywords: Fine-Tuning; Large Language Models; Load Profile Analysis; Missing Data Restoration; Prompt Engineering
topics (OpenAlex): Energy Load and Power Forecasting; Smart Grid Energy Management; Electric Power System Optimization
Sources: Web Of Science, NC State University Libraries
Added: December 9, 2024

2024 journal article

BERT-PIN: A BERT-Based Framework for Recovering Missing Data Segments in Time-Series Load Profiles

IEEE Transactions on Industrial Informatics, 20(10), 12241–12251.

By: Y. Hu n , K. Ye n, H. Kim n & N. Lu n 

author keywords: Load modeling; Transformers; Encoding; Data models; Bidirectional control; Power systems; Adaptation models; Bidirectional encoder representations from transformers (BERT); conservation voltage reduction; machine learning; missing data restoration; power system; transformer
topics (OpenAlex): Time Series Analysis and Forecasting; Anomaly Detection Techniques and Applications
UN Sustainable Development Goals Color Wheel
UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID, NC State University Libraries, Crossref
Added: July 8, 2024

2023 article proceedings

A Modified Sequence-to-point HVAC Load Disaggregation Algorithm

By: K. Ye n, H. Kim n, Y. Hu n , N. Lu n , D. Wu * & P. Rehm

author keywords: demand response; HVAC load; load disaggregation; machine learning; convolutional neural network (CNN); transfer learning
topics (OpenAlex): Building Energy and Comfort Optimization; Smart Grid Energy Management; Energy Load and Power Forecasting
TL;DR: Simulation results show that the proposed modified S2P algorithm outperforms the original S1P model and the support-vector machine based approach in accuracy, adaptability, and transferability. (via Semantic Scholar)
UN Sustainable Development Goals Color Wheel
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (Web of Science; OpenAlex)
Sources: Web Of Science, NC State University Libraries, Crossref
Added: November 20, 2023

2023 article proceedings

An ICA-Based HVAC Load Disaggregation Method Using Smart Meter Data

By: H. Kim n, K. Ye n, H. Lee n, R. Hu n, N. Lu n , D. Wu *, P. Rehm

author keywords: HVAC system; Independent component analysis; Non-intrusive load monitoring; Smart meter data
topics (OpenAlex): Blind Source Separation Techniques; Smart Grid Energy Management; Advanced Adaptive Filtering Techniques
TL;DR: An independent component analysis (ICA) based unsupervised-learning method for heat, ventilation, and air-conditioning (HVAC) load disaggregation using low-resolution smart meter data and uses the dependency between the daily nocturnal and diurnal loads extracted from historical meter data to smooth the base load profile. (via Semantic Scholar)
UN Sustainable Development Goals Color Wheel
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (Web of Science; OpenAlex)
Sources: Web Of Science, NC State University Libraries, Crossref
Added: June 5, 2023

2023 article proceedings

Design Considerations of a Coordinative Demand Charge Mitigation Strategy

By: R. Hu n, K. Ye n, H. Kim n, H. Lee n, N. Lu n , D. Wu *, P. Rehm

author keywords: demand reduction; demand response; load forecast; payback; peak demand probability.
topics (OpenAlex): Smart Grid Energy Management; Energy Efficiency and Management; Energy Load and Power Forecasting
UN Sustainable Development Goals Color Wheel
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (Web of Science; OpenAlex)
Sources: Web Of Science, NC State University Libraries, Crossref
Added: November 20, 2023

2021 article

Probabilistic Solar Power Forecasting Based on Bivariate Conditional Solar Irradiation Distributions

Kim, H., & Lee, D. (2021, May 3). IEEE Transactions on Sustainable Energy.

By: H. Kim n & D. Lee *

author keywords: Forecasting; Predictive models; Probabilistic logic; Correlation; Gaussian processes; Solar power generation; Probabilistic forecasting; Solar power; Kriging technique; Offer strategy; Gaussian process; Gradient boosting
topics (OpenAlex): Solar Radiation and Photovoltaics; Energy Load and Power Forecasting; Photovoltaic System Optimization Techniques
TL;DR: A two-stage probabilistic solar power (SP) forecasting algorithm to utilize the solar irradiation (SI) observations measured from different locations and a changeable ensemble model, where there are different weights for each weather condition, is proposed. (via Semantic Scholar)
UN Sustainable Development Goals Color Wheel
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (Web of Science; OpenAlex)
Source: Web Of Science
Added: October 12, 2021

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