Publication
-Conference-
International
S. Cho, S. Bae, An Experimental Study on the Micro-scale Deformation Behavior of CO2-cured Di-calcium and Tri-calcium Silicate Pastes Using In-situ Loading Atomic Pair Distribution Function Analysis, 1st RILEM International Conference on Mineral Carbonation for Cement and Concrete, 2024
Junxing Liu, Peiqi Li, S.Bae, Binder jetting 3D Printing of TiO2-reinforced Cementitious Materials, The 13th International Symposium on Architectural Interchanges in Asia, 2022
Peiqi Li, Junxing Liu, S.Bae, Exploring the effect of graphene oxide nanoribbons–functionalized carbon nanotubes–graphene oxide (GNFG) complex on cementitious composites’ fire resistance, The 13th International Symposium on Architectural Interchanges in Asia, 2022
Junxing Liu, Heongwon Suh, Hyeonseok Jee, Xu Jiahao, Su Chuanrui, S.Bae, Mechanical Properties and Hydration Kinetics of CNT/TNT Hybrid Reinforced Cementitious Composites, Sustainable Built Environment Conferences, 2019
Jaeyeon Park, Sungwun Her, Sumin Im, Seung Min Woo, Keunhong Jeong, S.Bae, Neutron Shielding Performance of PE-B4C Composite-incorporated Cement Paste, Sustainable Built Environment Conferences, 2019
Hyeonseok Jee, Jaeyeon Park, Sungwun Her, Erfan Zalnezhad, Keunhong Jeong, S.Bae, Effect of Titanate Nanotubes on The Properties of Cement-Based Composites, 2nd RILEM Spring Convention & International Conference on Sustainable Materials, Systems and Structures, 2019
Taehoon Park, Heongwon Suh, Jaeyeon Park, Bumyean Cho, Seyoon Yoon, S.Bae, Analysis of Steel Fibers Distribution And Orientation in Hybrid-Fibers Reinforced High-Performance Concrete Column Using Micro-Computed Tomography, 2nd RILEM Spring Convention & International Conference on Sustainable Materials, Systems and Structures, 2019
Sungwun Her, Hyeonseok Jee, Taehonn Park, Dongcheon Park, S.Bae, A Study on Feasibility of Cement Clinker Manufacture Using Oyster Shell As Limestone Substitute, 2nd RILEM Spring Convention & International Conference on Sustainable Materials, Systems and Structures, 2019
Jaeyeon Park, Sungwun Her, Heongwon Suh, Seungmin Woo, Keunhong Jeong, S.Bae, Mechanical Behavior and Neutron Shielding Performances of TiO2-Incorporated Cement Composites, 2nd RILEM Spring Convention & International Conference on Sustainable Materials, Systems and Structures, 2019
Heongwon Suh, Taehoon Park, Hyeonseok Jee, Bumyean Cho, S.Bae, Effects of Recurring Conditions on The Mechanical Recovery and The Properites of Portland Cement Paste Subjected to High Temperature, 2nd RILEM Spring Convention & International Conference on Sustainable Materials, Systems and Structures, 2019
H. Suzuki, M. Kanematsu, S. Bae, A. Shiro and T. Shobu, PDF Analysis on Nanostructural Deformation of Portland Cement Paste, 8th international conference on mechanical stress evaluation by neutron & synchrotron radiation, 2015 (refereed paper)
M. Kanematsu, S. Shiroishi, S. Bae, M. Tamura, K. Imamoto N. Tuchiya, T. Noguchi, Investigation on Building Materials of the Former National Stadium, Tokyo, Part.2 Environmental Survey, Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan, 2015.
S. Shiroishi, M. Kanematsu, S. Bae, K. Imamoto, J. Hamasaki, T. Noguchi, M. Tamura, N. Tuchiya, Investigation on Building Materials of the Former National Stadium, Tokyo, Part.7 Moisture content, Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan, 2015.
N. Emura, T. Koyama, S. Bae, M. Kanematsu, K. Nagai, Study on the Deterioration behavior of the High-rise Buildings Based on the Investigation of Actual Structure, Part-3 Deterioration Characteristics of the Structural Components, , Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan, 2015.
K. Taku, S. Bae, R. Inose, M. Kanematsu, Study on Factor of Explosing Spalling in The High Strength Concrete, Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan, 2015.
T. Koyama, S. Bae, R. Inose, M. Kanematsu, Investigation on the Factors of Spalling of High Strength Concrete and Effects of Polypropylene Fibers Addition, The 5th Conference on Non-destructive Inspection of Reinforced Concrete, 2015 (refereed paper)
M. Kanematsu, S. Bae, T. Koyama, R. Inose, N. Tuchiya, M. Tamura, Y. Nishio, T. Noguchi Evaluation of the Moisture Movement in High-Performance Concrete Subjected to Heating, KURRI Progress Report, 2015
H. Kako, M. Kanematsu, S. Bae, H. Yoshioka, K. Nagai, An Evaluation of Bond Properties Between Repair Materials and High-strength Concrete, Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan, 2015.
S. Bae, M. Kanematsu, P.J.M. Monteiro, NEXAFS Analysis of the Effect of Fly Ash on Si Polymerization and Al Substitution for Si in C-S-H, Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan, 2015.
H. Suzuki, K. Kusunoki, M. Kanematsu, A. Tasai, Y. Hatanaka, N. Tsuchiya, S. Bae, S. Shiroishi, S. Sakurai, T. Kawasaki, and S. Harjo, Application of Neutron Stress Measurement to Reinforced Concrete Structure, Accepted in JPS conference proceedings, 2014 (Refereed paper)
S. Bae, H. Hayano, T.Noguchi, Study on the Effect of Lightweight Aggregate on Reducing Autogenous Shrinkage, Proceedings of the International Conference on Sustainable Building Asia SB10, pp 239–244, 2010. (Refereed paper)
S. Bae, H. Hayano, T. Noguchi, Study on Effect of Decrease in Cracking due to Autogenous Shrinkage of Recycled aggregate, Japan Cement Association, No.21, pp.127-128, 2009. (Refereed paper)
S. Bae, H. Hayano, T. Noguchi, H. Nagai, Study on Effect of Decrease in Cracking due to Autogenous Shrinkage of Lightweight aggregate, JCI Annual Convention, No.31-1, pp.565-570, 2009 (Refereed paper)
I. Maruyama, M. Kanematu, A.Teramoto, H. Hayano, N.Tsuchiya, S. Bae, H.Ikura, T.Noguchi, Visualization of Water Transfer Between Lightweight Aggregate and Surrounding Cement Paste by Neutron Radiography, Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan, A-1, pp.1237-1238, 2009
S. Bae, H. Hayano, T. Noguchi, Study on Effect of Decrease in Cracking due to Autogenous Shrinkage of Light-weight Concrete (Part.3 Evaluation in the long-term by using Model Concrete specimen),Summaries of Technical Papers of Annual Meeting , Architectural Institute of Japan, A-1, pp.273-274, 2009
S.Bae, W.Park, T.Noguchi, H.Nagai, Study on Effect of Decrease in Cracking due to Autogenous Shrinkage of Recycled aggregate, Summaries of Technical Papers of Annual Meeting, Architectural Institute of Japan, A-1, pp.275-276, 2009
S.Bae, Study on the Effect of Light-weight Aggregate and Recycled Aggregate on Reducing Autogenous-shrinkage, Department of Architecture ,Graduate School of Engineering, The University of Tokyo, 2009
H.Hayano, S.Bae, T.Noguchi, H.Nagai, Study on Effect of Decrease in Cracking due to Autogenous Shrinkage of Light-weight Concrete(Part.2 Evaluation by Chemical Analyses and Observation of Micro-structure), Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan, A-1, pp.877-878, 2008
S. Bae, H.Hayano, T.Noguchi, H.Nagai, Study on Effect of Decrease in Cracking due to Autogenous Shrinkage of Light-weight Concrete (Part.1 Evaluation of Cracking Potential in Restraint Condition), Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan, A-1, pp.875-876, 2008
Domestic
The Spring Conference on Korea Concrete Institute
J. Park, S. Her, P. Li, S. Bae, Development of Fly ash-based geopolymer incorporating recycled cement paste as raw material for calcium silicate source, 2023
D. Jin, S. Her, G. Kim, T. Piao, S Bae, Evaluation of the surface Topography of Hardened Cement Paste via 3D-Printed PDMS Molds at different Angles, 2023
H. Suh, S. Sim, J. Xing, S.Bae, Correlation between Pore Clustering and Mechanical Properties of Nanomaterials Incorporated Ordinary Cement Paste, 2023
S. Cho, S. Im, S. Bae, Nano-structural investigation of the reaction products of pure tricalcium silicate paste by carbonation-hydration curing condition using pair distribution function, 2022
S. Im, S. Cho, S. Bae, A Study on the High-Temperature Characteristics of Synthetic Calcium Silicate Hydrate (C-S-H) According to Ca/Si Ratios, 2022
G. Kim, H. Suh, S. Im, S. Bae, Analysis of Changes in Atomic-scale Structure and Mechanical Properties of Synthetic Calcium Aluminosilicate Hydrate (C-A-S-H) According to Al/Si Ratio, 2021
H. Suh, J. Park, G. Kim, S. Bae, Evaluating the Effects of Nanosilica addition in Portland cement pastes on Recovery of Mechanical properties after heating, 2021
H. Suh, S. Im, J. Shin, S. Bae, Influence of Thermal decomposition of Carbon Nanotube on Mechanical Recovery of Portland Cement Paste after exposing to High Temperature, 2020
S. Im, H. Suh, J. Shin, S. Bae, Effect of Ca/Si Molar Ratio on Mechanical Properties of Synthetic Calcium Silicate Hydrates (C-S-H), 2020
S. Her, T. Park, S. Im, S. Bae, A Study on the Hydration of Limestone Calcined Clay Cement (LC3) Using Oyster Shell as Raw Materials, 2019
S. Im, H. Suh, H. Jee, T. Park, S. Bae, The Effect on Physicochemical characteristics of Calcium-Silicate-Hydrate (C-S-H) Pastes at Elevated Temputerature, 2019
J. Park, S. Her, S. Im, H. Jee, S. Bae, Evaluation of Fundamental Properties of Polymer Coated B4C-incorporated Cement Paste for Neutron Shielding Material, 2019
T. Park, J. Park, Y. Yoon, S. Bae, Analysis of Fiber Distribution in Fiber Reinforced Concrete Column Using Micro-Computed Tomography, 2018
J. Park, T. Park, S. Bae, Evaluation of Neutron Shielding Performance of Nano TiO2-incorporated Cement Paste using MCMP Simulation Code, 2018
S. Her, D. Park, S. Bae, A Study on Feasibility of Clinker Manufacture Using Oyster Shell as Limestone Substitute, 2018
H. Suh, H. Jee, S. Bae, Effects of Rehydration Conditions on the Mechanical Recovery and the Properties of Portland Cement Paste Subjected to High Temperature, 2018
H. Jee, H. Suh, S. Bae, Mechanical Properties and Early Hydration Kinetics of Titanate Nanotubes Reinforced Cement Composites, 2018
I, Park, S. Yoon, S. Bae, K. Lee, A Study for Suppression of γ-C2S and Synthesis of Highly Pure β-C2S, 2018
S. Bae, H. Jee, Pair Distribution Function Analysis of C-S-H and Ca(OH)2 in 53 Years-old C3S Paste, 2018
The Autumn Conference on Korea Concrete Institute
D. Jin, S. Im, G. Kim, S Bae, Eco-Friendly 3D Printing Mortar for Sustainable Construction, 2023
S. Cho, G. Kim, S. Her, S. Sim, S. Bae, Fundamental Investigation on the Physicochemical Properties of CO2-cured Cement Pastes for the Development of CO2-absorbing Low-carbon Construction Materials, 2023
S. Cho, S. Bae, Investigation of microstructure, mechanical properties, and CO2 sequestration capability of carbonation cured cement pastes according to the blending ratio of low-lime calcium silicate cement (CSC) and ordinary portland cement (OPC), 2023
S. Her, G. Kim, S. Cho, S. Sim, S. Bae, Influence of limestone powder particle size distribution and fineness on Portland limestone cement, 2023
S. Im, J. Park, T. Piao, S. Bae, Nanostructure analysis of magnesium silicate hydrate paste, 2023
S. Im, D. Jin, G. Kim, S. Bae, Analysis of Mechanical Properties of Binder-Aggregate Interface in High-Strength Mortar incorporating Carbon Nanotubes, 2023
J. Park, S. Im, T.Piao, S. Bae, Evaluation of Co-60 immobilization performance of recycled cement paste-incorporated geopolymer, 2023
S. Cho, S. Im, S. Bae, Nano-structural investigation of the reaction products of pure tricalcium silicate paste by carbonation-hydration curing condition using pair distribution function, 2022
S. Im, S. Cho, S. Bae, A Study on the High-Temperature Characteristics of Synthetic Calcium Silicate Hydrate (C-S-H) According to Ca/Si Ratios, 2022
S. Cho, G. Kim, H. Suh, S. Bae, Investigation of electro-conductive characteristics of cement paste reinforced with graphene oxide, functionalized carbon nanotube, and nano-silica triple-hybrid, 2021
G. Kim, H. Suh, S. Cho, S. Bae, Assessment of Mechanical Properties of Nanomaterial Triple-hybrid Reinforced Cement Paste, 2021
H. Suh, G. Kim, S. Cho, S. Bae, Evaluating the performance and mechanism of thermal resistance of Carbon nanotube and Nanosilica incorporated ordinary cement paste, 2021
S. Im, D. Jin, S. Bae, Nanostructural Deformation Analysis of Calcium Silicate Hydrate (C-S-H) According to Ca/Si Molar Ratio via High Energy X-ray Scattering Measurement, 2020
P. Li, S. Her, J. Park, S. Bae, Evaluation on mechanical properties of synthesized graphene oxide-carbon nanotubes composite incorporated with cement pastes, 2019
S. Im, H. Suh, H. Jee, P. Li, S. Bae, Influence of Ca/Si ration on the nanostructural deformation of synthetic calcium silicate hydrate paste, 2019
S. Her, T. Park, J. Park, H. Suh, S. Bae, Properties of Cement Clinker Synthesized by Egg Shell as the Substitution for Limestone, 2019
The Spring Conference on the Korea Institute of Building Construction
S. Cho, G. Kim, S. Bae, Improving the CO2 sequestration capability and mechanical properties of CO2 reactive cement paste using pH swing method, 2023
J. Liu, P. Li, S. Bae, Effect of nano-TiO2 size on the properties of cement-based materials produced by binder jet 3D printing, 2022
P. Li, J. Liu, S. Bae, Investigation of the mechanical and electrical properties of graphene nanoribbons-reinforced cementitious composites, 2022
S. Im, S. Bae, Effects of Ca/Si Molar Ratio on the Interatomic Distance of Synthetic Calcium Silicate Hydrate (C-S-H) at Elevated Temperature, 2021
T. Park, H. Suh, S. Bae, Analysis of Orientation and Distribution of Steel Fiber in Fiber Reinforced Concrete Column by Micro-CT Scanning, 2019
H. Suh, T. Park, S. Bae, Effects of Carbon nanotube Incorporation on the Mechanical Recovery of Portland Cement Paste Exposed to High Temperatures, 2019
H. Jee, J. Park, S. Bae, Analysis of Nanostructural Deformation Behavior of Cement Clinker Substituting High-volume Fly ash by Pair Distribution Function, 2019
The Autumn Conference on the Korea Institute of Building Construction
P. Li, J. Liu, S. Bae, A study on the mechanical strength change of graphene nanoribbons enhanced cement paste at a high-temperature, 2023
J. Liu, P. Li, S. Bae, Characterization of mechanical and photocatalytic performance on cement-based materials with TiO2 particles for binder jet 3D printing, 2023
J. Liu, D. Jin, S. Bae, Effect of Curing Period on Photocatalytic Effect of TiO2 Nanotube-reinforced Cement Paste, 2021
J. Liu, H. Jee, H. Suh, S. Bae, Influence of TiO2 Particle Size and Structure on its Photocatalytic Effect in Cement Paste, 2020
P. Li, J. Liu, H. Suh, S. Bae, Synthesis of highly dispersed graphene oxide-functionalized carbon nanotubes complexes and its effect on the reinforcing the properties of cement paste, 2020
H. Suh, P. Li, J. Liu, S. Bae, Investigation on the Structural Changes of Calcium Silicate Hydrates in Nanosilica-incorporated Cement Pastes exposed to Heating using Nuclear Magnetic Resonance Spectroscopy, 2020
H. Suh, H. Jee, T. Park, S. Bae, Effects of Carbon Nanotube and Nanosilica Incorporation on the Mechanical Recovery of Portland Cement Paste Exposed to High Temperatures, 2019
H. Jee, H. Suh, T. Park, S. Bae, Analysis of Nano Structure of Pure C3S Paste Subjected to High Temperature using Atomic Pair Distribution Function, 2019
The Spring Conference on the Korean Recycled Construction Resource Institute
S. Cho, T. Piao, S. Bae, Investigation of the CO2 sequestration capability of carbonation-cured recycled cement paste using pH swing method by acid treatment, 2023
S. Her, J. Park, S. Bae, Effect of the limestone fineness on the strength development of limestone calcined clay cement (LC3), 2022
S. Her, S. Im, S. Bae, Characteristics of Domestic Calcined Clay Limestone Cement (LC3), 2021
S. Im, S. Her, S. Bae, Pair Distribution Function Analysis of Graphene Oxide Incorporated Calcium Silicate Hydrates (C-S-H), 2021
J. Park, S. Im, S. Bae, Simulation Analysis of Neutron Shielding Performance of Cement Paste-incorporated PE-B4C Complex, 2019
S. Im, J. Park, S. Bae, Effects of Heating on Atomic Pair Distribution function of Synthetic Calcium Silicate Hydrate (C-S-H), 2019
The Autumn Conference on the Korean Recycled Construction Resource Institute
S. Im, D. Jin, G. Kim, S. Bae, Analysis of Mechanical Properties of Binder-Aggregate Interface in High-Strength Mortar incorporating Carbon Nanotubes, 2023
G. Kim, D. Jin, S. Im, S. Bae, Comparative analysis between the limestone calcined clay cement incorporating nano-calcite and nano-silica, 2023
S. Im, J. Moon, S. Bae, Analysis on the Interfacial Transition Zone (ITZ) of Lightweight High-Strength Mortar Incorporated with CNT, 2022
J. Moon, S. Im, S. Bae, Experimental evaluation of hydrate formation and mechanical properties of limestone calcined clay cement (LC3) according to calcination temperature of low-quality kaolin clay in Korea, 2022
S. Her, S. Im, S. Bae, Effect of Gypsum Content on the Early-age Hydration in Limestone Cement Clinker, 2021
S. Im, S. Bae, Effect of Ca/Si Molar Ratio on Physicochemical Characteristics of Synthetic Calcium Silicate Hydrate (C-S-H) Pastes, 2020
J. Park, S. Im, S. Bae, Material properties of the composites for neutron shielding by the contents of boron carbide & polyethylene, 2020
S. Im, J. Park, S. Bae, Evaluation on Mechanical Properties of ITZ of Lightweight High-Strength Concrete via Nanoindentation, 2020
S. Im, J. Park, S. Bae, Effect of High Temperature on Silicate Chains of Synthetic Calcium Silicate Hydrate(C-S-H), 2019
The Spring Conference on Architectural Institute of Korea
P. Li, S. Cho, T. Piao, J. Liu, S. Bae, Investigation of graphene nanoribbons improved fire resistance of cement paste, 2023
J. Liu, P. Li, T. Piao, S. Bae, Effect of mixture ratio and accelerator on the mechanical strength of cement mortar for binder jet 3D printing, 2023
H. Suh, S. Cho, G. Kim, S. Bae, An Analysis of Pore Characteristics of Nanomaterials Incorporated Cement Paste According to Heating via Focused Ion Beam–Scanning Electron Microscope, 2023
S. Cho, H. Suh, G. Kim, S. Bae, Comparison of the nanostructure of carbonation products of hydraulic and non-hydraulic calcium silicates using pair distribution function, 2023
The Autumn Conference on Architectural Institute of Korea
T. Piao, H. Suh, Y. Chen, S. Sim, S. Bae, Comparative evaluation of mechanical and surfactants-assisted ultrasonication methods for graphene nanoribbons dispersion and stability assessment in water and alkaline environments, 2023
S. Sim, H. Suh, Y. Chen, S. Bae, Investigation of the hydration characteristics and physical properties of the Portland limestone cement (PLC) incorporated with nano-alumina, 2023
Y. Chen, T. Piao, H. Suh, S. Sim, S. Bae, Hydration properties of acid modified dehydrated cement powder, 2023
H. Suh, S. Sim, T. Piao, Y. Chen, S. Bae, Assessment of Thermal Resistance of Low-Lime Calcium Silicate Cement (CSC) Paste, 2023
D. Jin, G. Kim, J. Moon, S. Bae, The Correlations between The Surface Pattern Angle and Hydrophobicity of The Hardened Cement Paste Replicated by a 3D Printer Mould, 2022
S. Her, S. Jeong, D. Jin, G. Kim, S. Bae, A study of packing density of Portland cement and Portland limestone cement based on wet-packing method, 2022
G. Kim, H. Suh, S. Cho, S. Bae, Investigation of the optimal mixing ratio of graphene oxide, functionalized carbon nanotube, and nano-silica triple-hybrid for cement paste reinforcement, 2022
H. Suh, G. Kim, D. Jin, S. Bae, Quantitative Characterization of Pore Morphology in Graphene Oxide, Functionalized Carbon Nanotube, and Nano-silica Triple-hybrid Cement Paste via X-ray Nanoimaging, 2022
S. Her, J. Park, J. Shin, S. Bae, A Study on the Clinker Phase Formation of Oyster Shell Cement at Differential Clinkerization Temperature, 2020
J. Shin, S. Her, J. Park, S. Bae, Evaluation of The Self-Healing Performance of Repair Mortar Incorporating Inorganic Admixtures, 2020
J. Park, S. Her, J. Shin, S. Bae, Shielding performance evaluation of the polyethylene-boron carbide composite incorporated cement paste by fast neutron irradiation, 2020
The Spring Conference on Korea Institute for Structural Maintenance and Inspection
S. Cho, H. Suh, G. Kim, D. Jin, S. Bae, Effects of incorporating graphene oxides, functionalized carbon nanotubes, and nano-silica on the electro-conductive characteristics of cement composites, 2022
D. Jin, H. Suh, S. Cho, S. Bae, Correlations between Surface shape and Hydrophobicity of Cement Paste Produced by PDMS Mold, 2022
H. Suh, G. Kim, S. Cho, D. Jin, S. Bae, Investigation of the characteristics of graphene oxide, functionalized carbon nanotube, and nano-silica triple-hybrid and its influence on cement paste as reinforcements, 2022
P. Li, H. Suh, S. Bae, A study on the fire resistance of graphene oxide nanoribbons-functionalized carbon nanotubes-graphene oxide complex reinforced cement paste, 2021
J. Liu, P. Li, S. Bae, Evaluation of mechanical properties and photocatalytic performance of cement paste containing TiO2 nanotubes, 2021
H. Suh, J. Liu, S. Bae, Investigation on the Effect of Carbon Nanotube in Fire-damaged Cement paste on the Strength recovery properties using X-ray Nanoimaging, 2021
The Autumn Conference on Korea Institute for Structural Maintenance and Inspection
G. Kim, H. Suh, S. Cho, S. Bae, Investigation of the physicochemical characteristics of metakaolin-based geopolymer according to changing Si/Al ratio, 2022
H. Suh, G. Kim, S. Bae, Thermal resistance of graphene oxide, functionalized carbon nanotube, and nano-silica triple-hybrid cement paste, 2022
P. Li, S. Cho, S. Bae, Investigation of comparison between graphene nanoribbons-modified cement paste and ordinary cement paste: Electrical properties, 2021
S. Cho, J. Park, P. Li, S. Bae, Investigation on Physicochemical Phase Transition and Recyclability of Hardened Cement Paste Waste Treated by Sulfuric Acid, 2021
J. Park, S. Cho, P. Li, S. Bae, Evaluation of Shielding Performance of Polyethylene-Boron Carbide Composite incorporated Cement Paste for Dual Purpose Spent Fuel Cask Using MCNP, 2021