This is the 7196th most frequent Korean word.
주장이자
"주장이자" means "both a claim and an opinion."
In this sentence, '주장이자' implies that the author is someone who proposes or advocates a theory while also taking actions related to it, using '-이자' to signify dual roles.
이 논문의 저자는 동시에 주장이자 실행자이다.
The author of this paper is simultaneously a proponent and executor.
The usage of '주장이자' here denotes that the person performed the role of a leader or captain among other responsibilities, with '-이자' connecting the roles in a descriptive list.
그 회의에서 그는 회사의 대표이자 주장이자 중재자였다.
In the meeting, he was the company representative, captain, and mediator.
Here, '주장이자' is used to denote one of the multiple roles fulfilled by the person described, combining the word '주장' (captain) with '-이자' (a conjunctive particle indicating simultaneity).