Yeah I read this news article recently. Very interesting fork...
"1분당" = "per minute"
Ex) 이 포크는 1 분당 입 안에 들어가는 횟수로 먹는 속도를 측정한다.
= this fork estimates the speed of eating by counting the times the fork is inside the mouth per minute.
Sorry for my poor English =(
Anyway hope u get what it means.