P$4.(20$ points$)$ For the fabrication of MOSFET integrated circuits, due to improper design and some inevitable processing$/$material constraints, we cannot avoid non$-$ideal frequency properties in MOSFETs circuits such as higher operation speed $($operation frequency$)$ in scaled$-$down devices $($short channel MOSFET$).$ Please describe in detail with Korean why those frequency delay $($comparing to ideal case$)$ can be occurred and how we can reduce the effects as much as you can $($you should use figures or conceptual diagrams for the structures$)-$ you should use Korean language for the description. If you are foreigner, you can use English.