This is the 557th most frequent Korean word.
참여한
"Participated" or "involved."
In this sentence, '참여한' acts as an adjective describing 'people' who are participants, highlighting their involvement.
참여한 사람들은 모두 경험 있는 전문가들입니다.
The participants are all experienced professionals.
'참여한' here relates to the researchers who participated in the mentioned project, as an attributive descriptor.
그는 이번 연구 프로젝트에 활발히 참여한 연구원 중 한 명이다.
He is one of the researchers who actively participated in this research project.
Here, '참여한' is used as a verb in the past participle form, meaning 'participated', to describe an action done in the past, emphasizing involvement in a specific context.