This is the 4864th most frequent Korean word.
교내
"교내" means "on campus" or "within the school."
교내 is used here to describe events or activities that occur within the boundaries of the campus.
나는 교내 축제 준비를 다 했어요.
I have finished preparing for the campus festival.
In this context, 교내 specifies that the students receiving the notice are those who are part of the campus community.
교내 학생들에게 새로운 공지 사항이 전달되었습니다.
A new notice has been delivered to the students on campus.
Here, 교내 refers to the location where the research project is taking place, indicating its association with the campus.