2.4hz ๊ฐ„์„ญ ๋•Œ๋ฌธ์ด๋ผ๊ธธ๋ž˜ ๊ป๋Š”๋ฐ ์ด์ œ ํ•ด๊ฒฐ๋˜๋ ค๋‚˜