Abstract: A data compression apparatus includes a lossy compression unit for calculating, in advance, a reference error vector magnitude depending on lossy compression and decompression by removing lower bits from a data signal composed of bitstreams, for setting removal target lower bits satisfying a preset error vector magnitude requirement, and for lossily compressing the data signal by removing the removal target lower bits from the data signal, and a communication unit for transmitting the compressed data signal to a data decompression apparatus.

Abstract: Disclosed herein are a method for transmitting and receiving compressed data and an apparatus therefor. According to the method for transmitting compressed data, a transmission apparatus for transmitting compressed data standardizes the value of an In-phase/Quadrature-phase (IQ) data sample to a preset type that is selected from among a positive number and a negative number, determines the sample type of the IQ data sample, the value of which is standardized to the preset type, based on a sample type determination rule, generates a compressed bit string based on the compression rule pertaining to the determined sample type, generates compressed data, including at least one of a reference bit corresponding to the sample type, the sign bit of the IQ data sample, and the compressed bit string, for each IQ data sample, and transmits the compressed data to a reception apparatus.

Abstract: A method for managing operating system executed by an electronic device is provided. The method includes obtaining, by a guest module of the guest operating system, information regarding a guest app executable on the guest operating system, providing, by the guest module, the information regarding the guest app to a host module of the host operating system, providing, by the host module, the information regarding the guest app to an app list creation module of the host operating system, combining, by the app list creation module, information regarding a host app executable on the host operating system and the information regarding the guest app, and outputting, by the app list creation module, an app execution list that includes the combined information.

Abstract: Disclosed herein are an apparatus and method for data compression and decompression based on calculation of an error vector magnitude. A data compression apparatus includes a lossy compression unit for calculating, in advance, a reference error vector magnitude depending on lossy compression and decompression by removing lower bits from a data signal composed of bitstreams, for setting removal target lower bits satisfying a preset error vector magnitude requirement, and for lossily compressing the data signal by removing the removal target lower bits from the data signal, and a communication unit for transmitting the compressed data signal to a data decompression apparatus.

Abstract: Disclosed herein are a method for transmitting and receiving compressed data and an apparatus therefor. According to the method for transmitting compressed data, a transmission apparatus for transmitting compressed data standardizes the value of an In-phase/Quadrature-phase (IQ) data sample to a preset type that is selected from among a positive number and a negative number, determines the sample type of the IQ data sample, the value of which is standardized to the preset type, based on a sample type determination rule, generates a compressed bit string based on the compression rule pertaining to the determined sample type, generates compressed data, including at least one of a reference bit corresponding to the sample type, the sign bit of the IQ data sample, and the compressed bit string, for each IQ data sample, and transmits the compressed data to a reception apparatus.

Abstract: Disclosed are a roll-off period detection method, a symbol starting point detection method, a fractional frequency offset estimating method, and an OFDM downstream system using the same. A method of detecting a roll-off period in an OFDM downstream system according to an embodiment of the present disclosure may include: generating a temporary roll-off period by applying a windowing function to a signal having a preset length; and detecting a roll-off period based on any one of a cross correlation and a sum of differences between a detection target signal included in a range of two OFDM symbol signals based on a detection starting point, and the temporary roll-off period.

Abstract: A device and method for providing the security of data by using multiple modes in the device are provided. The device includes a storage unit that includes a normal mode data area and a security mode data area which is isolated from the normal mode data area and access to which is allowed only in a security mode; and a controller that processes data in the normal mode data area during a normal mode, and processes data in the security mode data area during the security mode.

Abstract: Disclosed are an apparatus and a method for soft-decision demodulating in non-square quadrature amplitude modulation. The apparatus includes: a signal receiving unit receiving a quadrature amplitude modulation (QAM) modulated signal at an m modulation degree at a transmitting side; a soft-decision bit calculating unit determining a soft-decision bit value by calculating log likelihood ratios (LLRs) for m bits of the received QAM modulated signal; and a signal decoding unit restoring the received QAM modulated signal based on the determined soft-decision bit value, in which the soft-decision bit calculating unit defines a log likelihood ratio calculation equation by approximating soft-decision boundary points of constellation points for m bits of non-square QAM having odd bits, respectively.

Abstract: A method for managing operating system executed by an electronic device is provided. The method includes obtaining, by a guest module of the guest operating system, information regarding a guest app executable on the guest operating system, providing, by the guest module, the information regarding the guest app to a host module of the host operating system, providing, by the host module, the information regarding the guest app to an app list creation module of the host operating system, combining, by the app list creation module, information regarding a host app executable on the host operating system and the information regarding the guest app, and outputting, by the app list creation module, an app execution list that includes the combined information.

Abstract: Disclosed are an apparatus and a method for soft-decision demodulating in non-square quadrature amplitude modulation. The apparatus includes: a signal receiving unit receiving a quadrature amplitude modulation (QAM) modulated signal at an m modulation degree at a transmitting side; a soft-decision bit calculating unit determining a soft-decision bit value by calculating log likelihood ratios (LLRs) for m bits of the received QAM modulated signal; and a signal decoding unit restoring the received QAM modulated signal based on the determined soft-decision bit value, in which the soft-decision bit calculating unit defines a log likelihood ratio calculation equation by approximating soft-decision boundary points of constellation points for m bits of non-square QAM having odd bits, respectively.

Abstract: A device and method for providing the security of data by using multiple modes in the device are provided. The device includes a storage unit that includes a normal mode data area and a security mode data area which is isolated from the normal mode data area and access to which is allowed only in a security mode; and a controller that processes data in the normal mode data area during a normal mode, and processes data in the security mode data area during the security mode.

Abstract: Provided is a plasma treatment apparatus using a leakage current transformer, the apparatus, including: a chamber which provides a closed space in which plasma is formed, and receives a treated sample in an inner part thereof; an exhaust unit for forming the inner part of the chamber in a vacuum state; plasma generation electrodes fixed in the chamber, positive and negative poles of which are installed to be opposed to each other; a variable power supply which is installed in an outer part of the chamber and supplies a power source to the plasma generation electrodes; and a leakage current transformer which is installed between the variable power supply and the plasma generation electrodes and adjusts voltage and current applied to the plasma generation electrodes.