Abstract: Disclosed is a disc-shaped sample chamber for collecting molten metal, the chamber comprising: a chamber body having a left body and a right body bonded to each other to define a disc-shaped sample space therebetween; an inlet extending upward from the chamber body and connecting the sample space with the outside; and a welded bonding portion disposed on at least one lateral face of the chamber body for bonding the left body and the right body to each other. Further, a probe having the chamber is disclosed.

Abstract: Provided are a self voice training method for a patient with a voice disorder and a user terminal for self voice training. The user terminal for self voice training includes an input device configured to receive a training program selection command of a user, a storage configured to store voice training candidate programs for the user's voice training, a calculator configured to generate first guide content according to a first voice training program selected from among the voice training candidate programs by the user, an output device configured to output the first guide content, and a microphone configured to receive voice output by the user according to the first guide content output through the output device.

Abstract: Disclosed is a brake disc for vehicles including a ring-shaped disc part provided with an insertion space formed at the central region thereof, a hub part disposed within the insertion space and provided with recesses formed on the external circumferential surface thereof, and connection parts configured to connect the disc part and the hub part, wherein each of the connection parts is divided into a curved section extending from the internal circumferential surface of the disc part and having both curved side surfaces and a rectilinear section extending from the curved section, having both flat side surfaces and inserted into each of the recess, and widths of the curved section and the rectilinear section are decreased in a direction toward the hub part.

Abstract: Disclosed is a brake disc for vehicles including a ring-shaped disc part provided with an insertion space formed at the central region thereof, a hub part disposed within the insertion space and provided with recesses formed on the external circumferential surface thereof, and connection parts configured to connect the disc part and the hub part, wherein each of the connection parts is divided into a curved section extending from the internal circumferential surface of the disc part and having both curved side surfaces and a rectilinear section extending from the curved section, having both flat side surfaces and inserted into each of the recess, and widths of the curved section and the rectilinear section are decreased in a direction toward the hub part.