Abstract: The present disclosure relates to an organic electroluminescent device. The organic electroluminescent device of the present disclosure shows high luminous efficiency and good lifespan by comprising a specific combination of the plural kinds of host compounds and a specific hole transport compound.

Abstract: The present disclosure relates to an organic electroluminescent device. The organic electroluminescent device of the present disclosure shows high luminous efficiency and good lifespan by comprising a specific combination of the plural kinds of host compounds and a specific hole transport compound.

Abstract: The present disclosure relates to an apparatus for measuring temperature distribution in a wide area using a diamond nitrogen vacancy center sensor and a method for fabricating the same, and disclosed is a diamond nitrogen-vacancy center sensor capable of measuring a temperature in a wide area including: a plurality of diamond thin films that are provided at different positions on an insulator and are not connected to each other, and it will be possible to measure temperature distribution in a wide area using the same.

Abstract: A fluid-cooled electromagnet includes an upper housing, a lower housing vertically aligned with the upper housing, a plurality of pancake coils disposed between the upper housing and the lower housing to be spaced apart from each other and sequentially stacked to have a washer shape, and at least one spacer, disposed between the upper housing and the lower housing, accommodating the pancake coils at regular intervals.

Abstract: Provided are an ultra-low field nuclear magnetic resonance device and a method for measuring an ultra-low field nuclear resonance image. The ultra-low field nuclear magnetic resonance device includes an AC power supply configured to supply a current to a measurement target in such a manner the current flows to the measurement target, magnetic field measurement means disposed adjacent to the measurement target, and measurement bias magnetic field generation means configured to apply a measurement bias magnetic field corresponding to a proton magnetic resonance frequency of the measurement target. A vibration frequency of the AC power supply matches the proton magnetic resonance frequency of the measurement target, and the magnetic field measurement means measures a nuclear magnetic resonance signal generated from the measurement target.

Abstract: A fluid-cooled electromagnet includes an upper housing, a lower housing vertically aligned with the upper housing, a plurality of pancake coils disposed between the upper housing and the lower housing to be spaced apart from each other and sequentially stacked to have a washer shape, and at least one spacer, disposed between the upper housing and the lower housing, accommodating the pancake coils at regular intervals.

Abstract: Provided are an ultra-low field nuclear magnetic resonance device and a method for measuring an ultra-low field nuclear resonance image. The ultra-low field nuclear magnetic resonance device includes an AC power supply configured to supply a current to a measurement target in such a manner the current flows to the measurement target, magnetic field measurement means disposed adjacent to the measurement target, and measurement bias magnetic field generation means configured to apply a measurement bias magnetic field corresponding to a proton magnetic resonance frequency of the measurement target. A vibration frequency of the AC power supply matches the proton magnetic resonance frequency of the measurement target, and the magnetic field measurement means measures a nuclear magnetic resonance signal generated from the measurement target.

Abstract: Provided is a low magnetic field and ultra-low magnetic field NMR and MRI apparatus. The low magnetic field and ultra-low magnetic field NMR and MRI apparatus includes a SQUID sensor and a prepolarization magnetic field coil. The prepolarization magnetic field coil generates a prepolarization magnetic field to polarize a sample. The prepolarization magnetic coil generates a counter pulse in a direction opposite to that of the prepolarization magnetic field immediately before or immediately after the prepolarization magnetic field is generated. The counter pulse demagnetizes wanted magnetization including that of the prepolarization magnetic field coil itself.

Abstract: An electromagnet includes insulating cooling plates of a ceramic material which are vertically arranged parallel to each other, washer-shaped insulating center spacers maintained at a constant distance between adjacent insulating cooling plates, pancake coils including Litz wires which are spirally wound on each of the insulating center spacers in the space between the adjacent insulating cooling plates, and a housing which covers at least outer side surfaces of the insulating cooling plates and the pancake coils and provides a coolant to cool the insulating cooling plates.

Abstract: Provided are an atomic magnetometer and an operating method of the same. The atomic magnetometer includes a vapor cell receiving a circularly polarized pump beam and a linearly polarized probe beam and containing an alkali metal vapor, a detector adapted to receive the probe beam passing through the vapor cell to measure magneto-optical rotation of the probe beam, a feedback coil to establish a negative feedback magnetic field signal orthogonal to a first plane defined by traveling directions of the probe beam and the pump beam and provide the negative feedback magnetic field signal to the vapor cell, and a feedback amplifier adapted to provide feedback current to the feedback coil such that the negative feedback magnetic field proportional to a measurement magnetic field is established. The measurement magnetic field of a measurement target provides magneto-optical rotation of the probe beam in the vapor cell.

Abstract: Provided is a low magnetic field and ultra-low magnetic field NMR and MRI apparatus. The low magnetic field and ultra-low magnetic field NMR and MRI apparatus includes a SQUID sensor and a prepolarization magnetic field coil. The prepolarization magnetic field coil generates a prepolarization magnetic field to polarize a sample. The prepolarization magnetic coil generates a counter pulse in a direction opposite to that of the prepolarization magnetic field immediately before or immediately after the prepolarization magnetic field is generated. The counter pulse demagnetizes wanted magnetization including that of the prepolarization magnetic field coil itself.

Abstract: Provided are an atomic magnetometer and an operating method of the same. The atomic magnetometer includes a vapor cell receiving a circularly polarized pump beam and a linearly polarized probe beam and containing an alkali metal vapor, a detector adapted to receive the probe beam passing through the vapor cell to measure magneto-optical rotation of the probe beam, a feedback coil to establish a negative feedback magnetic field signal orthogonal to a first plane defined by traveling directions of the probe beam and the pump beam and provide the negative feedback magnetic field signal to the vapor cell, and a feedback amplifier adapted to provide feedback current to the feedback coil such that the negative feedback magnetic field proportional to a measurement magnetic field is established. The measurement magnetic field of a measurement target provides magneto-optical rotation of the probe beam in the vapor cell.

Abstract: A dust remover according to the present disclosure forms an air flow in a space formed between a charge-coupled device and a shutter unit, and removes dust on a surface of the charge-coupled device, the dust remover comprising an air injector having a plurality of air injecting holes; an air discharger which is installed on a surface facing the air injector, and has at least one air discharging hole which is smaller than the air injecting hole; and an exhausting dust collecting filter which is installed in the air discharger, and collects dust in the air being discharged.

Abstract: An image stabilizer that compensates for external vibrations by moving an imaging unit. The image stabilizer includes a first frame on which an imaging unit is installed, a second frame that is connected to the first frame using three points and guides movement of the first frame in a first direction and second direction, and a third frame that is connected to the second frame using three points and guides the first frame and the second frame to move in a third direction and fourth direction, which are perpendicular to the first and second directions.

Abstract: A dust remover according to the present disclosure forms an air flow in a space formed between a charge-coupled device and a shutter unit, and removes dust on a surface of the charge-coupled device, the dust remover comprising an air injector having a plurality of air injecting holes; an air discharger which is installed on a surface facing the air injector, and has at least one air discharging hole which is smaller than the air injecting hole; and an exhausting dust collecting filter which is installed in the air discharger, and collects dust in the air being discharged.

Abstract: An image stabilizer that compensates for external vibrations by moving an imaging unit. The image stabilizer includes a first frame on which an imaging unit is installed, a second frame that is connected to the first frame using three points and guides movement of the first frame in a first direction and second direction, and a third frame that is connected to the second frame using three points and guides the first frame and the second frame to move in a third direction and fourth direction, which are perpendicular to the first and second directions.

Abstract: Disclosed are an auto-focusing apparatus and a camera employing the same. The auto-focusing apparatus includes a pupil division unit including a plurality of holes of different sizes. The pencil of light ray entering through the photographing lens of the camera are divided into a plurality of pencils of light ray by being passed through the plurality of holes. The pupil division unit is arranged to focus the plurality of pencils of light ray onto an image capturing unit of the camera. The auto-focusing apparatus further includes a calculation unit that determines the focusing state of the camera based on combined images of the plurality of pencils of light ray captured by the image capturing unit.