Delta root: a new definition of a square root of fuzzy numbers. - Taechang Byun; Ji Eun Lee; Jin Hee Yoon (Soft Comput., 2022)

Fuzzy real weak inner product: a new approach to fuzzy inner products. - Taechang Byun; Ji Eun Lee; Jin Hee Yoon (Soft Comput., 2023)

Delta Cube Root as a General Concept of the Cube Root of a Fuzzy Number. - Ji-Hoon Hong; Jon-Lark Kim; Taechang Byun; Jin Hee Yoon (Int. J. Fuzzy Log. Intell. Syst., 2024)