Abstract: A cascade-type multiplex radio communication relay system, in which a donor and a Main Hub Unit (MHU) are connected to each other through an Unshielded Twisted Pair (UTP) cable to enable duplex communication, and in which a plurality of remote units are connected to the MHU through UTP cables to enable duplex communication. The cascade-type multiplex radio communication relay system adopts a method of converting at least two different RF communication signals into a single UTP transmission frame, and relaying the UTP transmission frame through a UTP cable in a digital communication manner.

Abstract: A remote keyless entry system particularly suited for preventing access to unauthorized individuals by securely encrypting messages transmitted from a remote transmitter to a receiver. A unique encryption algorithm is used to generate a multibit message having a pseudorandom number, key code and transmitter identification code (ID) encrypted within. The encryption algorithm generates said multibit message as a function of a pseudorandom number generator, a fixed key code table, ID and a switch, e.g., command, code. A receiver can decrypt the message to obtain the switch code and will respond thereto only if the message originated from an authorized transmitter, i.e., if the received pseudorandom number, key code and ID match those stored within the receiver.

Abstract: A monitor tilting device capable of tilting the monitor using one hand. In an embodiment, the device comprises a cabinet bottom having a tilting opening at its rear lower surface, a monitor tilting member rotatably downwardly received in the tilting opening, a sliding washer rotatably receiving the upper section of the tilting member, and a torsion spring member elastically supporting the tilting member for supporting a tiled position of the monitor. In another embdiment, the device comprises a bracket integrally formed on the bottom surface of the monitor and a tilting member rotatably engaged with this bracket. In a further embodiment, the device comprises a monitor stand having a sliding depression, a sliding washer slidably coupled to an insert member of the sliding depression, and a bottom surface of the monitor fixedly coupled to the sliding washer.

Abstract: A monitor tilting device capable of tilting the monitor using one hand. In an embodiment, the device comprises a cabinet bottom having a tilting opening at its rear lower surface, a monitor tilting member rotatably downwardly received in the tilting opening, a sliding washer rotatably receiving the upper section of the tilting member, and a torsion spring member elastically supporting the tilting member for supporting a tiled position of the monitor. In another embdiment, the device comprises a bracket integrally formed on the bottom surface of the monitor and a tilting member rotatably engaged with this bracket. In a further embodiment, the device comprises a monitor stand having a sliding depression, a sliding washer slidably coupled to an insert member of the sliding depression, and a bottom surface of the monitor fixedly coupled to the sliding washer.

Abstract: Disclosed is a CD changer which comprises a rack formed on the bottom of a tray which has an outer end having a half-gear part by leaving a gear only on a half of the upper portion and a non-gear part flatted by removing the gear on the lower portion; a tray locking stopper formed on the bottom of the tray adjacent to the half-gear part of the rack; a pinion drum in which a first pinion and a second pinion is formed integrally, and a half-gear part and a non-gear part are formed on a part of the second pinion and a semicircular wall part formed on the upper portion of the second pinion for locking the tray in cooperation with the stopper; a CD double insertion preventing device composed a fixed plate for being fixed on the upper bottom of the housing of the CD changer and a rotating plate pivotably connected to the front part of the fixed plate; and a plurality of protrusion formed in a line on the lower surface of the CD loading roulette on the tray, for generating a CD selecting signal and a roulette stoppi