Abstract: A super-steep switching device and an inverter device using the same are disclosed. The super-steep switching device includes a semiconductor channel disposed on a substrate and made of a semiconductor material having impact ionization characteristic; a source electrode and a drain electrode in contact with the semiconductor channel, wherein the source electrode and the drain electrode are disposed on the substrate and are spaced apart from each other; and a gate electrode disposed on the semiconductor channel so as to overlap only a portion of the semiconductor channel, wherein a top surface of the semiconductor channel includes a first area overlapping the gate electrode, and a second area non-overlapping the gate electrode, wherein a ratio of a length of the first area and a length of the second area is in a range of 1:0.1 to 0.4.

Abstract: A hot and cold pack for breast treatment for pregnant women is provided. The hot and cold pack for breast treatment for pregnant women includes a cover including a through hole in a center thereof, through which a user's nipple passes, and having an annular shape of which a portion is open to adjust a size according to the size of a user's breast while wrapping and covering the user's breast, a thermal insulating material filled inside the cover, and a length adjustment unit provided in the open portion of the cover to connect both sides of the open cover, and adjusting the size of the cover.