Abstract:
A digital adjusting signal for adjusting a multi-channel SQUID system is transmitted only to a control circuit module including a SQUID channel selected in an embodiment of the present invention and not transmitted to other modules. Accordingly, the digital adjusting signal is prevented from flowing into all SQUID adjusting channels to minimize noise generated by the digital adjusting circuit of the SQUID channel and to stably control the SQUID sensor without malfunction.
Abstract:
A pulse laser output stabilizing apparatus including a directional coupler to receive output of pulse laser, the output branching into a first optical path and a second optical path, a photodetector to receive light branching into the first optical path and output current according to intensity of the light, a current-voltage converter to convert output current of the photodetector into a voltage and output converted voltage, a function generator to provide an output proportional to output signal of the current-voltage converter with a predetermined frequency, a time delay unit on the second optical path providing a predetermined time delay for feedback control, and an acousto-optic tunable modulator to receive output signal of the functional generator and optical signal from the time delay unit as an input and modulate and output the optical signal from the time delay unit according to amplitude of the output signal of the function generator.
Abstract:
Provided are a superconducting accelerometer, an acceleration measurement device, and an acceleration measurement method. The superconducting accelerometer includes a test mass including a rod-shaped body part, a disc-shaped coupling part connected to the body part, the test mass being made of a superconductor; a solenoid levitation coil disposed to surround a portion of the body part and adapted to magnetically levitate the test mass, the solenoid levitation coil being made of a superconductor; a measurement superconductor coil disposed at at least one side of an upper portion and a lower portion of the coupling part; and a SQUID sensor adapted to detect current depending on variation of a distance between the test mass and the measurement superconductor coil.
Abstract:
A levitation apparatus and a levitation method are provided. The levitation apparatus includes a top electrode and a bottom electrode disposed to be spaced apart from each other, a main power source adapted to apply a voltage to the top electrode or the bottom electrode such that a charged object levitates against gravity by using an electrostatic force generated by the voltage, a laser to heat the charged object, and spherical mirrors to re-reflect reflected light reflected from the charged object to the charged object. The reflected light may be generated when output light of the laser passing through a through-hole formed in a surface central region of each of the spherical mirrors is reflected by the charged object.
Abstract:
Provided are a method of forming an upper electrode of a nanowire array and a nanowire array having an upper electrode formed thereon. The method includes a step of placing a polymeric thin film layer, a step of pressing, a step of treating a mixed solution, a step of etching, and a step of depositing an electrode material, such that the upper electrode is reliably formed in a state in which the polymeric thin film layer is formed on a portion of the nanowire, thereby making it possible to implement various nano-devices based on the nanowire array aligned on a substrate having a large area.
Abstract:
Provided is a preparation method of a free fatty acid particle dispersion solution, the preparation method including: a) dissolving fatty acid in a solvent to prepare a fatty acid solution; and b) injecting the fatty acid solution in a non-solvent having miscibility with the solvent to prepare a free fatty acid particle dispersion solution.
Abstract:
The movement-free bending method means the one of deformation methods for a one- or two-dimensional nanostructures using an ion beam capable of bending and deforming them and furthermore, changing a bending direction without requiring a motion such as a rotation of the nanostructures. The present invention affords a movement-free bending method for deforming the nanostructure 20 having the one-dimensional or two-dimensional shape by irradiating the ion beam 10, wherein a bending direction of the nanostructure 20 is controlled depending on energy of the ion beam 10 or a thickness of the nanostructure 20.
Abstract:
Provided are ultra-low-field nuclear-magnetic-resonance myocardial electrical activity detection method and an ultra-low-field nuclear-magnetic-resonance device. The ultra-low-field nuclear-magnetic-resonance device includes magnetic shielding means; high-sensitivity magnetic field measuring means disposed adjacent to a measurement target disposed inside the magnetic shielding means; and bias magnetic field generating means for providing an external measurement bias magnetic field, corresponding to a proton magnetic resonance frequency (nuclear magnetic resonance frequency) corresponding to a frequency of periodic myocardial activity of a lesion desired to be measured, to the measurement target. The high-sensitivity magnetic field measuring means measures a magnetic resonance signal generated from the measurement target.
Abstract:
Disclosed is a vicarious radiometric calibration system. More specifically, disclosed is a ground reference target for calibrating a digital signal that is obtained through a sensor when a landmark is observed from a satellite or an airplane by using a spectral reflection factor or spectral emissivity of the ground reference target and a vicarious radiometric calibration system including the same. It is possible to derive accurate measurement results for the MWIR region by installing a ground reference target having predetermined reflectance or emissivity and having a special form on the ground with respect to the calibration of a sensor for remote exploration, such as aviation, space, and astronomy, and performing absolute radiometric calibration by using images that are obtained through the ground reference target.
Abstract:
An ultrasonic NDT method and system, which can extract and analyze a defect signal even when a signal reflected from a defect interferes with a unique initial pulse of an ultrasonic transducer or a signal reflected from the surface of a test object, and an autoencoder-based prediction model training method used therefor. The method may include acquiring a measured signal by transmitting an ultrasonic wave to a test object and receiving an ultrasonic wave reflected from the test object; inputting the measured signal to an autoencoder-based prediction model and predicting a reference signal which is to be expected to be measured from a test object with no defect; calculating a residual signal as the absolute value of a difference between the measured signal and the reference signal; and analyzing information on a defect contained in the test object by analyzing the residual signal.