Abstract: An operation method of an IoT terminal performing communications with a satellite may comprise: receiving a first signal from the satellite; determining a number of symbols constituting a preamble based on the first signal; generating a first frame including a preamble generated according to the determined number of symbols, and transmitting the generated first frame to the satellite; and generating a second frame including a preamble generated according to the determined number of symbols when a response signal to the first frame is received from the satellite, and transmitting the generated second frame to the satellite.

Abstract: A method for receiving a wireless signal, performed by a first communication node, may comprise: storing a wireless signal received by the first communication node as samples in a buffer; performing partial correlation operations on the stored samples by a plurality of partial correlators; performing a first FFT operation on results of the partial correlation operations; performing a cumulative product operation on results of the first FFT operation; performing a second FFT operation based on a result of the cumulative product operation; and performing synchronization estimation based on the results of the first FFT operation and a result of the second FFT operation.

Abstract: A timing control method performed by a terminal included in a communication network may include: configuring an initial timing reference based on time information obtained from the communication network; receiving a first downlink (DL) signal from a base station; based on the initial timing reference and the first DL signal, obtaining first transmission time information that is information on a timing when the first DL signal is transmitted by the base station and first reception time information that is information on a timing when the first DL signal is received by the terminal; determining a first timing advance (TA) value based on comparison between the first reception time information and the first transmission time information; and adjusting an uplink (UL) transmission timing for the base station based on the first TA value.

Abstract: A sound output apparatus, a display apparatus and a method for controlling the same are provided. The sound output apparatus includes a housing; and at least one speaker provided on a side of the housing, wherein the housing includes an accommodation portion provided with an insertion groove to which the at least one speaker is inserted and mounted, wherein the at least one speaker includes a sound generator configured to generate a sound; and a guide tube that has a cross sectional area that changes from a first end of the guide tube to a second end of the guide tube, and wherein the guide tube receives the generated sound via the first end, and the guide tube includes an outer surface having a plurality of radiation apertures arranged in at least one row.

Abstract: A planar magnet speaker with excellent sound reproduction in a low frequency range and capable of providing a plurality of input controls includes a first magnet member, a second magnet member, a membrane including at least one wire formed between the first magnet member and the second magnet member, and a support frame.

Abstract: According to an aspect of an embodiment, a stereophonic sound reproduction apparatus includes: an input unit for receiving an acoustic signal; a control unit for acquiring an output acoustic signal for generating a virtual sound source for the received acoustic signal; and an output unit for outputting the acquired output acoustic signal by using a front speaker and a side speaker, wherein the control unit generates an attenuation signal that is a signal for attenuating or cancelling an inflow acoustic signal to be directly transferred to an audience in the output acoustic signal output from the side speaker, and the generated output acoustic signal includes the attenuation signal.

Abstract: A directional speaker and a display apparatus having the same are provided. In particular, the display apparatus includes a pair of directional speakers as a surround sound speaker, wherein each directional speaker includes a driver to generate sound and a guide tube provided with sound radiated holes linearly aligned on one surface thereof.

Abstract: A sound output apparatus, a display apparatus and a method for controlling the same are provided. The sound output apparatus includes a housing; and at least one speaker provided on a side of the housing, wherein the housing includes an accommodation portion provided with an insertion groove to which the at least one speaker is inserted and mounted, wherein the at least one speaker includes a sound generator configured to generate a sound; and a guide tube that has a cross sectional area that changes from a first end of the guide tube to a second end of the guide tube, and wherein the guide tube receives the generated sound via the first end, and the guide tube includes an outer surface having a plurality of radiation apertures arranged in at least one row.

Abstract: An acoustic output device and a control method thereof are provided.

Abstract: According to an aspect of an embodiment, a stereophonic sound reproduction apparatus includes: an input unit for receiving an acoustic signal; a control unit for acquiring an output acoustic signal for generating a virtual sound source for the received acoustic signal; and an output unit for outputting the acquired output acoustic signal by using a front speaker and a side speaker, wherein the control unit generates an attenuation signal that is a signal for attenuating or cancelling an inflow acoustic signal to be directly transferred to an audience in the output acoustic signal output from the side speaker, and the generated output acoustic signal includes the attenuation signal.

Abstract: An apparatus including a first speaker configured to output higher-frequency sound from among sound of a channel via at least one slit, and a second speaker configured to output lower-frequency sound from among the sound of the channel via at least one other slit. The at least one slit may have a thickness that is less than a wavelength of sound emitted.

Abstract: A directional speaker and a display apparatus having the same are provided. In particular, the display apparatus includes a pair of directional speakers as a surround sound speaker, wherein each directional speaker includes a driver to generate sound and a guide tube provided with sound radiated holes linearly aligned on one surface thereof.

Abstract: A planar magnet speaker with excellent sound reproduction in a low frequency range and capable of providing a plurality of input controls includes a first magnet member, a second magnet member, a membrane including at least one wire formed between the first magnet member and the second magnet member, and a support frame.

Abstract: An acoustic output device and a control method thereof are provided.

Abstract: An apparatus including a first speaker configured to output higher-frequency sound from among sound of a channel via at least one slit, and a second speaker configured to output lower-frequency sound from among the sound of the channel via at least one other slit. The at least one slit may have a thickness that is less than a wavelength of sound emitted.

Abstract: Disclosed is an organic framework including: planar layers formed by successively connecting building blocks arranged in the vicinity of each other, in which each of the building blocks includes two or three C6 to C204 aromatic ring groups covalently bonded to a linear or annular boron-containing cluster; and a Lewis base coordinated to the boron-containing cluster within the planar layers.

Abstract: In an apparatus for producing U3O8 powder, the apparatus has an oxidation reactor including an interior space, a scrap box loaded with UO2 sintered pellets to be oxidized and introduced into the interior space of the oxidation reactor, an impact generating unit applying an impact to the scrap box to dissipate heat generated by the oxidation of the UO2 sintered pellets in the oxidation reactor, and a control unit controlling an oxidation process. The apparatus for producing U3O8 powder allows the heat generated by the oxidation of the UO2 sintered pellets in the oxidation reactor to be uniformly dissipated by the impact generating unit, thus producing U3O8 powder having a larger specific surface area which can be used to obtain a sintered UO2 pellet with a larger and more stable grain size of increased quality.

Abstract: In an apparatus for producing U3O8 powder, the apparatus has an oxidation reactor including an interior space, a scrap box loaded with UO2 sintered pellets to be oxidized and introduced into the interior space of the oxidation reactor, an impact generating unit applying an impact to the scrap box to dissipate heat generated by the oxidation of the UO2 sintered pellets in the oxidation reactor, and a control unit controlling an oxidation process. The apparatus for producing U3O8 powder allows the heat generated by the oxidation of the UO2 sintered pellets in the oxidation reactor to be uniformly dissipated by the impact generating unit, thus producing U3O8 powder having a larger specific surface area which can be used to obtain a sintered UO2 pellet with a larger and more stable grain size of increased quality.

Abstract: Disclosed is a coordination polymer crystal with porous metal-organic frameworks (MOFs), in which, while a crystal state of the coordination polymer crystal is maintained, an additional material selected from the group consisting of an organic compound, a metal cluster, and an organometallic compound is chemically bonded to the coordination polymer crystal. Therefore it is possible easily adsorb and store more guest molecules regardless of a change in an ambient temperature or pressure due to the chemically bonded additional material.

Abstract: Disclosed is an organic framework including: planar layers formed by successively connecting building blocks arranged in the vicinity of each other, in which each of the building blocks includes two or three C6 to C204 aromatic ring groups covalently bonded to a linear or annular boron-containing cluster; and a Lewis base coordinated to the boron-containing cluster within the planar layers.