Abstract: A dual inverter control method is capable of improving power efficiency of an inverter and a motor by controlling a dual inverter through 6-step control to apply a voltage to the motor in a motor driving system using the dual inverter. The dual inverter control method for controlling first and second inverters having output terminals commonly connected to a motor includes comparing all voltage commands for driving the motor with the magnitude of a DC voltage commonly applied to the first and second inverters; and generating a first voltage command with respect to an output of the first inverter and a second voltage command with respect to an output of the second inverter by selectively applying high gain over voltage modulation (HOVM) depending on a comparison result.

Abstract: Disclosed herein is a charging system using a wound rotor synchronous motor (WRSM), capable of reducing volume, weight, and cost of a vehicle increased due to an on-board charging circuit and increasing a battery charge capacity. The charging system using a wound rotor synchronous motor (WRSM) includes an inverter converting power of a battery into alternating current (AC) powers having a plurality of different phases, a WRSM having a plurality of stator coils each receiving AC power of a different phase and a field coil forming mutual inductance with the plurality of stator coils and installed in a rotor to form a magnetic flux using power of the battery, and a controller controlling the battery side and the field coil side are insulated from each other in a charge mode in which grid power is applied to the field coil side of the WRSM.

Abstract: Disclosed herein is a charging system using a wound rotor synchronous motor, capable of increasing a battery charging capacity while reducing the volume, weight, and/or cost of a vehicle increased due to an on-vehicle charging circuit. The charging system includes an inverter converting a DC output of a battery into a plurality of AC signals having different phases, a wound rotor synchronous motor having a plurality of stator coils, to which the AC signals having different phases are respectively input, and a field coil forming a mutual inductance with the stator coils, the field coil being installed in a rotor to form a magnetic flux using the DC output of the battery, and a controller allowing the battery and the field coil to be insulated from each other in a charge mode in which electricity from a grid is applied to the field coil of the wound rotor synchronous motor.

Abstract: The present application relates to a distillation device. The distillation device of the present application can minimize energy loss occurring in a purification process of the olefin monomer, the solvent, and the raw material including, for example, 1-octene, iso-octene, and n-hexane, used in a polymerization process of the polyolefin elastomer, and can increase economic efficiency by isolating a high-purity product.

Abstract: A signal separation system using directional microphone array and a method for providing same. The signal separation system using directional microphone array includes a signal receiving section which receives a mixed signal in which a first audio signal and a second audio signal are mixed using the directional microphone array, the directional microphone array including at least one first microphone oriented in a first direction and at least one second microphone oriented in a direction different from the first direction, and receives a reference signal through the at least one second microphone. An audio signal separating section cancels the second audio signal from the mixed signal received by the signal receiving section, based on the reference signal inputted through the at least one second microphone.

Abstract: The disclosure relates to an electric power conversion apparatus, and capable of determining a minimum output voltage of a boost converter based on a voltage of the grid, and comparing the minimum output voltage of the converter with an input voltage of the converter, and controlling the operation of the converter based on the comparison result, thereby reducing the unnecessary operation and switching loss of the converter, the electric power conversion apparatus according to the invention comprises a converter; and a control unit configured to detect a grid voltage to determine a minimum output voltage of the converter based on the grid voltage, and control the operation of the converter based on an input voltage of the converter and the determined minimum output voltage.

Abstract: Facilities for offshore liquefied natural gas (LNG) floating storage with jack-up platform regasification unit, the facilities including: a jack-up unit comprising legs which have bottom part to be fixable to a sea bed and top part to be exposed to a surface of water, and a hull to be movable up and down with respect to the legs; a storage unit moored at the jack-up unit providing a space for storing LNG; a regasification unit as a module which regasifies the LNG supplied from the storage unit, installed on a top portion of the jack-up unit, separable from the jack-up unit; a utility unit comprising a power source and a sea water pump to supply power and sea water to the regasification unit; and a piping unit comprising unloading pipe for connecting the regasification unit and the storage unit and supplying pipe for carrying natural gas gasified by the regasification unit.

Abstract: The disclosure relates to an electric power conversion apparatus, and capable of determining a minimum output voltage of a boost converter based on a voltage of the grid, and comparing the minimum output voltage of the converter with an input voltage of the converter, and controlling the operation of the converter based on the comparison result, thereby reducing the unnecessary operation and switching loss of the converter, the electric power conversion apparatus according to the invention comprises a converter; and a control unit configured to detect a grid voltage to determine a minimum output voltage of the converter based on the grid voltage, and control the operation of the converter based on an input voltage of the converter and the determined minimum output voltage.

Abstract: A signal separation system using directional microphone array and a method for providing same. The signal separation system using directional microphone array includes a signal receiving section which receives a mixed signal in which a first audio signal and a second audio signal are mixed using the directional microphone array, the directional microphone array including at least one first microphone oriented in a first direction and at least one second microphone oriented in a direction different from the first direction, and receives a reference signal through the at least one second microphone. An audio signal separating section cancels the second audio signal from the mixed signal received by the signal receiving section, based on the reference signal inputted through the at least one second microphone.

Abstract: Facilities for offshore liquefied natural gas (LNG) floating storage with jack-up platform regasification unit, the facilities including: a jack-up unit comprising legs which have bottom part to be fixable to a sea bed and top part to be exposed to a surface of water, and a hull to be movable up and down with respect to the legs; a storage unit moored at the jack-up unit providing a space for storing LNG; a regasification unit as a module which regasifies the LNG supplied from the storage unit, installed on a top portion of the jack-up unit, separable from the jack-up unit; a utility unit comprising a power source and a sea water pump to supply power and sea water to the regasification unit; and a piping unit comprising unloading pipe for connecting the regasification unit and the storage unit and supplying pipe for carrying natural gas gasified by the regasification unit.

Abstract: A method for signal separation, communication system, and voice recognition system using the method are disclosed. The method which is performed by an apparatus for signal separation includes receiving a mixed signal, wherein a first signal based on a first sound source signal and a second signal based on a second sound source signal are mixed, via a single voice input sensor, applying the modified BSS algorithm for separating the first sound source signal and the second sound source signal based on the received mixed signal, and separating the first sound source signal according to the result of applying the modified BSS algorithm.

Abstract: Disclosed are a periodic payment system for service use fees and a control method thereof, and a service provider of the payment system and a control method thereof. The periodic payment system receiving information on credit of a subscriber from a payment information provider includes a payment acknowledgement server for determining whether or not a demanded payment is acknowledged based on the credit information of the subscriber provided by the payment information provider, and providing payment demand information to the payment information provider if it is determined that the demanded payment is acknowledged.

Abstract: Disclosed are a periodic payment system for service use fees and a control method thereof, and a service provider of the payment system and a control method thereof. The periodic payment system receiving information on credit of a subscriber from a payment information provider includes a payment acknowledgement server for determining whether or not a demanded payment is acknowledged based on the credit information of the subscriber provided by the payment information provider, and providing payment demand information to the payment information provider if it is determined that the demanded payment is acknowledged.