Abstract: An apparatus and method for enhancing the whole efficiency of power amplification in a supply modulated amplifier are provided. The power amplification apparatus includes a controller, a Doherty power amplifier, and a supply modulated amplifier. The controller selects a power amplifier among the Doherty power amplifier and the supply modulated amplifier. The Doherty power amplifier amplifies a power of a transmission signal when the Doherty power amplifier is selected by the controller. The supply modulated amplifier amplifies the power of the transmission signal using a supply voltage determined considering the amplitude of the transmission signal, when the supply modulated amplifier is selected by the controller.

Abstract: A transmit apparatus having a supply modulator is provided. The apparatus includes a detector and the supply modulator. In the method, the detector detects an output signal of the supply modulator. Also, the supply modulator receives the detected output signal of the supply modulator from the detector and calibrates a modulation characteristic of the supply modulator. The transmit apparatus having a supply modulator includes a modulator/demodulator (modem) and the supply modulator. The modem provides a calibration signal for calibrating a modulation characteristic of the supply modulator, to the supply modulator. The supply modulator outputs a modulated signal in accordance with the calibrated modulation characteristic of the supply modulator based on the calibration signal from the modem.

Abstract: In a wireless multi-hop network, a transmission scheduling apparatus calculates a transmission demand of every node within the wireless multi-hop network, and allocates a time slot to each node by using the transmission demand of each node.

Abstract: Disclosed herein is a method of providing vehicle wireless communication. In the method, a vehicle receives hand-over-related link information, which includes slot request information about slots requested by a vehicle to a roadside wireless communication device for hand-over of the vehicle, from a central control server. A hand-over preparation message, which includes the hand-over-related link information, is send to a vehicle wireless communication device connected to the vehicle. It is determined that the vehicle completed preparation for performance of the hand-over when a response message to the hand-over preparation message is received from the vehicle wireless communication device. Slots are allocated in consideration of the hand-over-related link information. Beacon frames, which include slot allocation information about the allocated slots, are transmitted to the vehicle wireless communication device.

Abstract: An apparatus for amplifying power is provided. The apparatus includes a supply modulator for generating a supply voltage based on an amplitude component of a transmission signal, and a power amplify module for amplifying power of the transmission signal using the supply voltage, wherein the power amplify module includes a first power amplifier and a second power amplifier, and when an output power of the transmission signal is greater than a reference power, the first power amplifier amplifies the power of the transmission signal using the supply voltage, and when the output power of the transmission signal is equal to or less than the reference power, the second power amplifier amplifies the power of the transmission signal using the supply voltage.

Abstract: Disclosed herein are an apparatus and method for detecting an obstacle adaptively to vehicle speed. The apparatus includes a control unit, a speed-adaptive camera sensor, a speed-adaptive laser scanner sensor, and a detection data integration unit. The control unit receives information about the speed of a vehicle and a Pulse Per Second (PPS) signal from a Global Positioning System (GPS) module. The speed-adaptive camera sensor adjusts the range of a detection region based on the information about the speed of the vehicle, and generates first detection data on an object. The speed-adaptive laser scanner sensor adjusts the range of the angle of the field of view of a laser scanner based on the information about the speed of the vehicle, and generates second detection data on the object. The detection data integration unit outputs obstacle detection data.

Abstract: This present disclosure relates to an atomic layer etching method for graphene, including adsorbing reactive radicals onto a surface of the graphene and irradiating an energy source to the graphene on which the reactive radicals are adsorbed.

Abstract: An apparatus of a hybrid power modulator using interleaving switching is provided. The apparatus includes a linear switching unit for generating an output signal by comparing an envelope input signal and a feedback signal, an interleaving signal generator for generating an interleaving switching signal arranged not to supply the signal to input stages of P-type Metal-Oxide-Semiconductor (MOS) Field Effect Transistors (FETs) and N-type MOS FETs of power cells at the same time by comparing the output signal and a reference signal, and a switching amplifying unit for determining a level of the switching signal using the interleaving switching signal. Hence, the hybrid power modulator using the interleaving switching method in the envelope signal of the wide bandwidth maintains high efficiency and high linearity. In addition, the buck converter can use the single inductor by preventing the simultaneous on/off of the power cells.

Abstract: Disclosed herein is an apparatus for detecting locations of a vehicle and an obstacle. The apparatus for detecting locations of a vehicle and an obstacle includes at least one distance measurement unit and a data processing unit. The distance measurement unit measures distance data relevant to a vehicle and an obstacle within a measurement area. The data processing unit maps the distance data on a grid layer, detects the location of the vehicle based on the result of the mapping, detects the location of the obstacle based on the detected location of the vehicle, and modifies the detected location of the vehicle using the distance data.

Abstract: An apparatus for managing an indoor moving object based on an indoor map and positioning infrastructure and a method thereof, the apparatus including a database configured to store an indoor map and positioning information, and a controller configured to divide an indoor space into indoor partition spaces in semantic units by use of the indoor map and the positioning information, and to store and manage an index that defines a relationship between the indoor partition space in the semantic unit and a moving object.

Abstract: An apparatus for amplifying power is provided. The apparatus includes a supply modulator for generating a supply voltage based on an amplitude component of a transmission signal, and a power amplify module for amplifying power of the transmission signal using the supply voltage, wherein the power amplify module includes a first power amplifier and a second power amplifier, and when an output power of the transmission signal is greater than a reference power, the first power amplifier amplifies the power of the transmission signal using the supply voltage, and when the output power of the transmission signal is equal to or less than the reference power, the second power amplifier amplifies the power of the transmission signal using the supply voltage.

Abstract: The present invention may relate to a scanning micromirror. The scanning micromirror can include a substrate having an open region; a micro plate provided in the open region; a first gimbal provided between the substrate and the mirror plate, and including a first curvature curved toward the mirror plate along an X-axis of the open region; a second gimbal including a second curvature formed along the first curvature of the first gimbal; a first elastic body configured to connect the substrate with the first curvature of the first gimbal; a second elastic body configured to connect the first gimbal with the second gimbal along a Y-axis of the open region; and a third elastic body configured to connect the second gimbal with the mirror plate along the Y-axis of the open region.

Abstract: An apparatus and a method for expanding an operation region in an envelope tracking power amplifier are provided. The apparatus for amplifying power of a transmission signal includes an amplitude component determination unit, a supply modulator, and a power amplify module. The amplitude component determination unit determines an amplitude component of a transmission signal. The supply modulator generates a supply voltage to be provided to the power amplify module depending on the amplitude component of the transmission signal determined by the amplitude component determination unit. The power amplify module amplifies power of the transmission signal depending on the supply voltage generated by the supply modulator.

Abstract: Disclosed herein are a method for handover in vehicular communications and On-Board Equipment (OBE) using the same. In the method for handover in vehicular communications, OBE performs a handover from first Road-Side Equipment (RSE) to second RSE. The OBE receives beacon frames from the first RSE and the second RSE. The first average value of a received signal strength indication corresponding to the beacon frame received from the first RSE and the second average value of a received signal strength indication corresponding to the beacon frame received from the second RSE are calculated. The first cumulative gradient of the first average value and the second cumulative gradient of the second average value are calculated. The handover from the first RSE to the second RSE is performed based on the first average value, the second average value, the first gradient, and the second gradient.

Abstract: An apparatus and a method for raising an output efficiency in a mobile communication terminal are provided. The apparatus includes a supply modulator and a power amplifier. The supply modulator includes a DC-DC converter, a voltage regulator, and a switching regulator. The supply modulator modulates an envelope component of an input signal to generate power. The power amplifier amplifies a phase component of the input signal using the power generated by the supply modulator as a power source of a collector/drain. The DC-DC converter raises battery power of the mobile communication terminal. The voltage regulator determines an output voltage of the supply modulator using the power raised by the DC-DC converter. The switching regulator determines an output current of the supply regulator using the battery power of the mobile communication terminal.

Abstract: Disclosed is an apparatus and method for supporting the safe navigation of ships based on mobile terminals which can prevent accidents at sea including marine collisions between small ships sailing near the coastline. The method for supporting the safe navigation of a ship in conjunction with a mobile terminal carried by a crew member of a ship includes collecting information about the navigation of the ship by a safe ship navigation supporting apparatus positioned in the ship, collecting information about surrounding ship through group communication with a server corresponding to the surrounding ship, converting a chart transmitted from a ground server into a format compatible with the mobile terminal, and applying safe navigation information created on the basis of the information about the navigation and the information about the ship to the converted chart, and providing the crew member with the safe navigation information through the mobile terminal.

Abstract: An electronic device and an operating method thereof are provided. The operating method thereof includes performing a first operation when the electronic device is connected with a counterpart device by a near wireless connection and performing a second operation when the electronic device is disconnected in the near wireless connection from the counterpart device.

Abstract: Provided is a method capable of providing an improved response property appropriate for the characteristics of a system by automatically choosing an interrupt handling mode used for each device. The method is a method in which the embedded operating system kernel determines a handling mode for all individual interrupts, the method includes: dividing interrupt handling modes into a first interrupt handling mode and a second interrupt handling mode which has a different process speed from the first interrupt handling mode, and variably determining a distribution ratio in which each of the interrupts are distributed to the first interrupt handling mode or to the second interrupt handling mode according to a predetermined process condition during boot-up.

Abstract: Disclosed is a phase error estimating an apparatus and a method which provides improved convergence speed and tracking speed even in mobile channel environment by variably applying the step size for phase error estimation according to channel status. The apparatus for estimating a phase error includes: a posterior probability (APP) average calculating unit for calculating an APP average value from a soft decision result of a currently received symbol; a step size determining unit for determining a step size variably according to channel status; and a phase error estimating unit for estimating a phase error of the currently received symbol from a phase error of a previously received symbol and the APP average value by using the variably determined step size.