Abstract: A semiconductor memory device includes a memory cell array including a plurality of memory banks, an address input portion which receives a row address and a column address through address pins during a normal mode operation and which receives the row address, the column address and write data through the address pins during a test mode operation, an address decoder which accesses one of the plurality of memory banks during the normal mode operation and at least two of the plurality of memory banks during the test mode operation in response to the row address and the column address, a data input portion which inputs write data applied through data pins to the memory cell array during the normal mode operation and which inputs write data output from the address input portion to the memory cell array during the test mode operation, and a data output portion which outputs read data output from the memory cell array to the data pins during the normal mode operation and the test mode operation.

Abstract: Disclosed are fine powder of waste polyurethane foam and a manufacturing method thereof. According to this invention, fine powder of waste polyurethane foam can be manufactured using a crushing process including primary and secondary coarse crushing steps and a fine grinding step and a classification process, thereby solving conventional problems of the deterioration of the properties and the difficulty forming a desired cell structure, due to the use of waste polyurethane powder having a large particle diameter, and widening the range of waste polyurethane that can be recycled.

Abstract: A multipath accessible semiconductor memory device having a mailbox area and a mailbox access control method thereof are provided. The semiconductor memory device includes N number of ports, at least one shared memory area allocated in a memory cell array, and N number of mailbox areas for message communication. The at least one shared memory area is operationally connected to the N number of ports, and is accessible through a plurality of data input/output lines to form a data access path between the at least one shared memory area and one port, having an access right to the at least one memory area, among the N number of ports. The N number of mailbox areas are provided in one-to-one correspondence with the N number of ports and are accessible through the plurality of data input/output lines when an address of a predetermined area of the at least one shared memory area is applied to the semiconductor memory device. An efficient layout of mailboxes and an efficient message access path can be obtained.

Abstract: Disclosed are fine powder of waste polyurethane foam and a manufacturing method thereof. According to this invention, fine powder of waste polyurethane foam can be manufactured using a crushing process including primary and secondary coarse crushing steps and a fine grinding step and a classification process, thereby solving conventional problems of the deterioration of the properties and the difficulty forming a desired cell structure, due to the use of waste polyurethane powder having a large particle diameter, and widening the range of waste polyurethane that can be recycled.

Abstract: A semiconductor memory device includes a memory cell array including a plurality of memory banks, an address input portion which receives a row address and a column address through address pins during a normal mode operation and which receives the row address, the column address and write data through the address pins during a test mode operation, an address decoder which accesses one of the plurality of memory banks during the normal mode operation and at least two of the plurality of memory banks during the test mode operation in response to the row address and the column address, a data input portion which inputs write data applied through data pins to the memory cell array during the normal mode operation and which inputs write data output from the address input portion to the memory cell array during the test mode operation, and a data output portion which outputs read data output from the memory cell array to the data pins during the normal mode operation and the test mode operation.

Abstract: Disclosed are a thermoplastic elastomer using waster rubber and a rubber product produced therefrom. This invention provides a thermoplastic elastomer using waste rubber, obtained by loading a mixture comprising waste rubber powder, an olefin-based thermoplastic resin, and a compatibilizer selected from styrene compounds into an extruder and then kneading it, and a rubber product produced therefrom. The extruder is preferably a twin-screw extruder in which two shafts, each having at least two forward screw parts, at least one kneading disc part, and at least one backward screw part, are arranged in parallel to each other. The thermoplastic elastomer according to this invention has rubber properties and thermoplastic properties and may be recycled several times.

Abstract: An apparatus and a method for modifying the surface of a polymer powder utilizes a rotational ultrasonic treatment that pulverizes polymer materials, such as rubber, waste rubber, and plastics, and modifies the surface, so that the polymer materials can be recycled more efficiently. A hopper feeds the pulverized polymer powder. A rotor which is linked to the bottom of the hopper as an integrated body, is linked to a driving mechanism through a power transfer device, and rotates drive. A rotating disk is linked to the bottom of the rotor as an integrated body, and is provided with a downsloped plane. A shaft extends through the hopper, the rotor, and the rotating disk, and discharges the polymer powder fed from the hopper out of the bottom of the rotating disk. An ultrasonic vibrator is positioned at the bottom of the rotating disk, and modifies the polymer powder fed by the shaft using ultrasonic waves.

Abstract: A method of cleaning a reaction chamber is provided. In the method, a wafer is removed from the reaction chamber, and a nitrogen triflouride (NF3) gas or NF3 plasma is implanted into the reaction chamber. The NF3 gas or NF3 plasma reacts with a phosphorous polymer located in the reaction chamber, and the phosphorus polymer is removed from the reaction chamber.

Abstract: An apparatus and a method for modifying the surface of a polymer powder utilizes a rotational ultrasonic treatment that pulverizes polymer materials, such as rubber, waste rubber, and plastics, and modifies the surface, so that the polymer materials can be recycled more efficiently. A hopper feeds the pulverized polymer powder. A rotor which is linked to the bottom of the hopper as an integrated body, is linked to a driving mechanism through a power transfer device, and rotates drive. A rotating disk is linked to the bottom of the rotor as an integrated body, and is provided with a downsloped plane. A shaft extends through the hopper, the rotor, and the rotating disk, and discharges the polymer powder fed from the hopper out of the bottom of the rotating disk. An ultrasonic vibrator is positioned at the bottom of the rotating disk, and modifies the polymer powder fed by the shaft using ultrasonic waves.