123 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Korea Advanced Institute of Science and TechnologyKR5 papers
- Korea Institute of Materials ScienceKR5 papers
- Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)DE4 papers
- Justus-Liebig-Universität GießenDE3 papers
- Kyungpook National UniversityKR3 papers
- Hanbat National UniversityKR2 papers
- Korea Research Institute of Standards and ScienceKR2 papers
- Korea University of Science and TechnologyKR2 papers
- Queen's UniversityCA2 papers
- Seoul National UniversityKR2 papers
- Sungkyunkwan UniversityKR2 papers
- Ajou UniversityKR1 paper
30 papers
Large Language Models for Power System Security: A Novel Multi-Modal Approach for Anomaly Detection in Energy Management Systems
Aydin Zaboli, Junho Hong, Alexandru Stefanov +2
This paper elaborates on an extensive security framework specifically designed for energy management systems (EMSs), which effectively tackles the dynamic environment of cybersecur…
Asymmetric Electronic Band Alignment and Potentially Enhanced Thermoelectric Properties in Phase-Separated Mg2X (X=Si,Ge,Sn) Alloys
Byungki Ryu, Samuel Foster, Eun-Ae Choi +8
The Mg2X (X=Si, Ge, Sn) based alloy is an eco-friendly thermoelectric material for mid-temperature applications. The Mg2Si1-xSnx and Mg2Ge1-xSnx alloys can be phase-separated into…
Reference compositions for bismuth telluride thermoelectric materials for low-temperature power generation
Nirma Kumari, Jaywan Chung, Seunghyun Oh +5
Thermoelectric (TE) technology enables direct heat-to-electricity conversion and is gaining attention as a clean, fuel-saving, and carbon-neutral solution for industrial, automotiv…
Wiedemann-Franz Law and Thermoelectric Inequalities: Effective ZT and Single-leg Efficiency Overestimation
Byungki Ryu, Seunghyun Oh, Wabi Demeke +6
We derive a thermoelectric inequality in thermoelectric conversion between the material figure of merit (ZT) and the module effective ZT using the Constant Seebeck-coefficient Appr…
Thermoelectric Algebra Made Simple for Thermoelectric Generator Module Performance Prediction under Constant Seebeck-Coefficient Approximation
Byungki Ryu, Jaywan Chung, SuDong Park
While thermoelectric material performances can be estimated using the ZT, predicting the performance of thermoelectric generator modules (TGMs) is complex due to the non-linearity…
Best Thermoelectric Efficiency of Ever-Explored Materials
Byungki Ryu, Jaywan Chung, Masaya Kumagai +9
A thermoelectric device is a heat engine that directly converts heat into electricity. Many materials with a high figure of merit ZT have been discovered in anticipation of a high…
Unique Temperature Distribution and Explicit Efficiency Formula for One-Dimensional Thermoelectric Generators under Constant Seebeck Coefficients
Jaywan Chung, Byungki Ryu, Hyowon Seo
A thermoelectric generator converts a temperature difference into electrical energy. Its energy conversion efficiency is determined by the steady-state temperature distribution ins…
Data-driven Control of an LCC HVDC System for Real-time Frequency Regulation
Young-Jin Kim
Recent advances in data sensing and processing technologies enable data-driven control of high-voltage direct-current (HVDC) systems for improving the operational stability of inte…
Optimal Voltage and Current Control of an HVDC System to Improve Real-Time Frequency Regulation
Do-Hoon Kwon, Youngjin Kim
High-voltage direct-current (HVDC) systems for constant or intermittent power delivery have recently been developed further to support grid frequency regulation (GFR). This paper p…
Native point defects and low -doping efficiency in solid solutions: A hybrid-density functional study
Byungki Ryu, Eun-Ae Choi, Sungjin Park +5
We perform hybrid-density functional calculations to investigate the charged defect formation energy of native point defects in , , and their solid solutions. The…
Counterintuitive example on relation between ZT and thermoelectric efficiency
Byungki Ryu, Jaywan Chung, Eun-Ae Choi +3
The thermoelectric figure of merit ZT, which is defined using electrical conductivity, Seebeck coefficient, thermal conductivity, and absolute temperature T, has been widely used a…
Metals by micro-scale additive manufacturing: comparison of microstructure and mechanical properties
Alain Reiser, Lukas Koch, Kathleen A. Dunn +16
Many emerging applications in microscale engineering rely on the fabrication of three-dimensional architectures in inorganic materials. Small-scale additive manufacturing (AM) aspi…
Hybrid-functional and quasi-particle calculations of band structures of Mg2Si, Mg2Ge, and Mg2Sn
Byungki Ryu, Sungjin Park, Eun-Ae Choi +4
We perform hybrid functional and quasi-particle band structure calculations with spin-orbit interaction to investigate the band structures of Mg2Si, Mg2Ge, and Mg2Sn. For all Mg2X…
Deep Learning Based Joint Pilot Design and Channel Estimation for Multiuser MIMO Channels
Chang-Jae Chun, Jae-Mo Kang, Il-Min Kim
In this paper, we propose a joint pilot design and channel estimation scheme based on the deep learning (DL) technique for multiuser multiple-input multiple output (MIMO) channels.…
Investigation of effective thermoelectric properties of composite with interfacial resistance using micromechanics-based homogenisation
Jiyoung Jung, Sangryun Lee, Byungki Ryu +1
We obtained the analytical expression for the effective thermoelectric properties and dimensionless figure of merit of a composite with interfacial electrical and thermal resistanc…
Thermoelectric degrees of freedom determining thermoelectric efficiency
Byungki Ryu, Jaywan Chung, SuDong Park
Thermal energy can be directly converted to electrical energy as a result of thermoelectric effects. Because this conversion realises clean energy technology, such as waste heat re…
Dynamic Power Splitting for SWIPT with Nonlinear Energy Harvesting in Ergodic Fading Channel
Jae-Mo Kang, Chang-Jae Chun, Il-Min Kim +1
We study the dynamic power splitting for simultaneous wireless information and power transfer (SWIPT) in the ergodic fading channel. Considering the nonlinearity of practical energ…
A micromechanics-based analytical solution for the effective thermal conductivity of composites with orthotropic matrices and interfacial thermal resistance
Sangryun Lee, Jinyeop Lee, Byungki Ryu +1
We obtained an analytical solution for the effective thermal conductivity of composites composed of orthotropic matrices and spherical inhomogeneities with interfacial thermal resi…
Deep Learning Diffuse Optical Tomography
Jaejun Yoo, Sohail Sabir, Duchang Heo +10
Diffuse optical tomography (DOT) has been investigated as an alternative imaging modality for breast cancer detection thanks to its excellent contrast to hemoglobin oxidization lev…
Work Function of Bismuth Telluride: First-Principles Approach
Byungki Ryu
First-principles approach is demonstrated to calculate the work function of Bi2Te3. The reference potential and the vacuum energy levels are extracted from the Bi2Te3 (0001) surfac…
Thermoelectric power factor of Bi-Sb-Te and Bi-Te-Se alloys and doping strategy: First-principles study
Byungki Ryu, Jaywan Chung, Eun-Ae Choi +2
By performing first principles calculations combined with Boltzmann transport equations, we calculate the thermoelectric power factor (PF) of Bi-Sb-Te and Bi-Te-Se ternary alloys a…
Hybrid-Density Functional Theory Study on Band Structures of Tetradymite-Bi2Te3, Sb2Te3, Bi2Se3, and Sb2Se3 Thermoelectric Materials
Sudong Park, Byungki Ryu
The low energy band structure near the band gap determines the electrical performance of thermoelectric materials. Here, by using the hybrid-density functional theory (hybrid-DFT)…
Defects responsible for abnormal n-type conductivity in Ag-excess doped PbTe thermoelectrics
Byungki Ryu, Min-Wook Oh, Jae Ki Lee +6
We find that Ag-interstitial () acts as an electron donor and plays an important role in Ag-excess doped polycrystalline PbTe thermoelectric materials. When Ag is heavily dop…
Prediction of Band Structure of -related Binary and Ternary Thermoelectric Materials
Byungki Ryu, Min-Wook Oh, Bong-Seo Kim +5
Density functional calculations have performed to study the band structures of -related binary (, , , and ) and / doped te…