Abstract:
An apparatus and a method capable of maximally transferring energy generated from an energy harvester apparatus to an output terminal by optimizing an input impedance of an apparatus for extracting maximum power disposed between an energy harvester apparatus and an energy storage apparatus are disclosed. The method for extracting maximum power includes: detecting, by an apparatus for extracting maximum power disposed between the energy harvest apparatus and an energy storage apparatus, a magnitude in output current flowing in the energy storage apparatus; comparing a magnitude in current extracted from the energy harvester apparatus with a magnitude in current supplied to the energy storage apparatus when the magnitude in output current is a positive number; and determining whether an algorithm for extracting maximum power using the magnitude in current based on the comparison result is applied and extracting the maximum power depending on the determination result.
Abstract:
A method and an apparatus for providing space information to a visually handicapped person using a reflected sound of ultrasonic wave. The apparatus for providing space information includes: an ultrasonic transmitting and receiving unit transmitting an ultrasonic wave for acquiring the space information to a surrounding space and receiving a reflected sound of ultrasonic wave reflected from obstacles through at least two channels; and a stereophonic sound converting unit converting the received reflected sound into an audible sound and outputting the audible sound.
Abstract:
Disclosed herein are an apparatus and method for controlling smart wear. The apparatus for controlling smart wear includes a motion capture unit, an error information unit, a motion estimation unit, and an actuation unit. The motion capture unit captures a motion of a user using sensors included in the smart wear. Then error information unit generates user error information using reference motion information and the results of the motion capture. The motion estimation unit estimates a subsequent motion of the user using the user error information. The actuation unit controls the smart wear of the user in real time using the estimated subsequent motion and the user error information.
Abstract:
Disclosed herein are a wearable wireless power transmission apparatus and a wearable wireless power transmission using the same. The apparatus includes a wearable energy harvesting unit, a wearable battery unit, a wearable power charging unit, a wearable power transmission processing unit, and a fiber-type primary coil unit. The wearable energy harvesting unit generates power from at least one of light energy and kinetic energy, and is attachable to fabric. The wearable battery unit stores the power, and is attachable and detachable to and from the fabric. The wearable power charging unit rectifies the power, charges the wearable battery unit, and is attachable and detachable to and from the fabric. The wearable power transmission processing unit generates a transmission signal, and is attachable and detachable to and from the fabric. The fiber-type primary coil unit wirelessly transmits the transmission signal to the secondary coil unit of the power reception terminal.
Abstract:
A battery charging system is provided. The battery charging system comprises an energy harvester configured to generate power; an input capacitor configured to store the power; a first DC-DC converter configured to perform maximum power point tracking by receiving the power to extract the maximum power; a storage capacitor configured to store the maximum power; a second DC-DC converter configured to convert the maximum power to a predetermined rechargeable voltage; and a battery configured to store the power converted to the rechargeable voltage, wherein the second DC-DC converter controls to prevent a low voltage from being inputted to the capacitor and to prevent energy from being consumed uselessly in the storage capacitor while converting the voltage.
Abstract:
An apparatus and method for transmitting data using a human body. The apparatus includes a parallel bit stream generation unit, a frequency selective spreading unit, a matched filter unit, and a transmission filter unit. The parallel bit stream generation unit outputs a parallel bit stream for an input serial bit stream. The frequency selective spreading unit divides the parallel bit stream into a preset number of bit groups, generates a single code vector by combining orthogonal code vectors corresponding to the respective bit groups, and shifts the center frequency of a transmission signal by spreading the single code vector using a frequency shift code. The transmission filter unit meets a transmit mask for the transmission signal.