조사한

In a sentence

• 그는 하루 종일 조사한 결과를 발표했다.

  He presented the results he had researched all day.

  In this sentence, '조사한' functions as an adjective-like modifier, describing '결과' (results) as those that were researched.

• 조사한 후에 결정을 내리는 것이 중요하다.

  It is important to make a decision after researching.

  Here, '조사한' is used with '후에' to indicate an action completed prior to making the decision.

• 지난주에 조사한 자료를 다시 확인합시다.

  Let's recheck the materials researched last week.

  In this usage, '조사한' describes '자료' (materials), indicating they were researched.