Abstract: The present invention relates to a composition for selectively etching silicon on a surface on which a silicon oxide film (SiO2) and silicon (Si) are exposed. According to the present invention, it is possible to improve etch selectivity of silicon on the semiconductor surface.

Abstract: Provided is a duct docking device for a ventilation seat of a vehicle. The duct docking device enables air to be easily blown to a seatback and a seat cushion with a passenger in a seat using only one blower by enabling a seatback duct mounted at the seatback and a seat cushion duct mounted at the seat cushion to be hermetically docked through a connector duct, etc. at an unfolded position of the seatback in which a passenger can sit, and by enabling the seatback duct mounted at the seatback and the seat cushion duct mounted at the seat cushion to be separated from each other at a folded position of the seatback in consideration of that there is no passenger in the seat.

Abstract: Provided is a bit-width optimization method for performing floating point to fixed point conversion (FFC) by at least one processor. The bit-width optimization method includes receiving a first floating-point value which represents a minimum value among floating-point values to be converted, receiving a second floating-point value which represents a maximum value among the floating-point values to be converted, receiving a maximum permissible error rate for performing FFC, calculating a minimum bit width of fixed-point notation which satisfies the maximum permissible error rate on the basis of the first floating-point value, the second floating-point value, and the maximum permissible error rate, and calculating a scale factor for FFC on the basis of the second floating-point value and the calculated minimum bit width.

Abstract: Disclosed is a method for using a unique IP address for a limited period of time in a device connected to a LAN which includes a router and a LAN device. In the method, the LAN device sends a unique IP address request to the router to be allocated a unique IP address, when the LAN device needs a unique IP address. The LAN device returns the allocated unique IP address to the router after using the allocated unique IP address.

Abstract: Disclosed is a method for using a unique IP address for a limited period of time in a device connected to a LAN which includes a router and a LAN device. In the method, the LAN device sends a unique IP address request to the router to be allocated a unique IP address, when the LAN device needs a unique IP address. The LAN device returns the allocated unique IP address to the router after using the allocated unique IP address.