Abstract: Disclosed is a transmissive wavelength tunable hyperspectral filter using layered twisted liquid crystal thin film, wherein the transmissive wavelength tunable hyperspectral filter is formed by laminating two or more layered twisted liquid crystal thin films having different broadband reflection bandgaps, wherein each of the layered twisted liquid crystal thin films includes a twisted liquid crystal layer including a plurality of unit liquid crystal molecules, and formed by arranging twisted liquid crystal complexes defining a preset cone angle along the helical axis with respect to the helical axis, and includes a pseudo-layer formed by arranging a plurality of twisted liquid crystal layers in a lengthwise direction of the helical axis at a preset inter-layer pitch (P).

Abstract: Disclosed is an amplification circuit, which includes a first amplifier that receives an external signal and performs first band pass filtering on the external signal to output a first filter signal, and a second amplifier that receives the first filter signal and performs second band pass filtering on the first filter signal to output a second filter signal, and a frequency pass bandwidth of the second band pass filtering is narrower than a frequency pass bandwidth of the first band pass filtering.

Abstract: A hybrid communication device, an operation method thereof, and a communication system including the same are provided. The hybrid communication device includes a contact unit that includes an antenna for receiving a first communication signal and an electrode for receiving a second signal, a switch controller that includes a first switch and a second switch and controls the first switch and the second switch based on a change in capacitance of the electrode, and a signal processing unit that receives at least one of the first communication signal and the second communication signal from the contact unit via the first switch and processes the received signal. The first switch is connected to the contact unit, and the signal processing unit is connected to the first switch.

Abstract: The present disclosure relates to a payment system and method using a real-name account of a seller, the system and method being expanded from universal payment gateway (PG) platforms to the over the top (OTT) platform market and, more specifically, a payment system and method in which a payment exclusive account (hereinafter, payment account) opened in the real-name of a seller is used by default so that, in non-face-to-face electronic commerce, transactions may be conducted in real-time through live broadcasts between a plurality of unspecified sellers and a plurality of unspecified buyers at home and abroad, thereby enabling convenient, speedy, and safe processing with reduced processing costs.

Abstract: An optical disc player for performing the backward and forward feeding operation of a tray by driving a feeding motor which controls the feeding operation of an optical pickup includes a feeding motor for generating a motive power, the optical pickup having a first rack gear at one side of the body thereof, and installed to a feeding space on a deck plate, a feeding pinion for receiving the motive power of the feeding motor by being brought into meshing engagement with the first rack gear to be rotated for permitting the optical pickup to move linearly, an auxiliary gear arbitrarily rotatable on the deck plate for being brought into meshing engagement with the first rack gear where the first rack gear reaches in a stop mode of the optical pickup, an auxiliary rack gear integrally formed with a tray for being brought into meshing engagement with the auxiliary gear, and a tray feeding gear for receiving the motive power transmitted from the feeding motor to be rotated about its position on a front upper plane o

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