Abstract: Disclosed is a motor driving apparatus including: a motor; an inverter including a switching element for driving the motor; a controller for controlling the switching element; a resolver including an excitation winding and a detection winding; and a resolver chip applying an excitation signal to the excitation winding by inputting a periodic signal from the controller, and receiving a feedback signal from the detection winding, wherein the resolver chip determines the number of rotations of the motor based on a change in a pulse width of a detection signal resulting from a comparison between a voltage of the feedback signal and a preset voltage, and output a signal to the inverter for setting an inertial driving control mode according to the number of rotations of the motor in a failure state of the controller.

Abstract: An optical inspection apparatus includes a stage that supports a target substrate, the target substrate including a plurality of light emitting elements, a jig that applies an electrical signal to the target substrate, the jig including a regulation resistor, a microscope that generates magnified image data of the target substrate, a camera that captures the magnified image data to generate a color image of the target substrate, and an optical measurement unit that captures the magnified image data of the target substrate to generate a spectrum image and measure optical characteristics of the target substrate.

Abstract: Disclosed is an apparatus for excitation signal generation for a resolver. The apparatus includes a sine wave generator that generates a sine wave based on a square wave, an amplifier that amplifies the sine wave, a differential signal generator that converts, into a differential signal, the amplified sine wave, a driver that inputs the differential signal to a coil, and a processor that generates an excitation signal by increasing a voltage of the sine wave from a start voltage to a target voltage through at least one of the sine wave generator and the amplifier based on a transient current that flows into the coil in a transient response interval.

Abstract: The present invention provides a method for creating an electronic document file comprising monitoring creation and changes of an electronic document file, receiving a policy file including document level set-up information and security policy, searching for words associated with business information from the text data retrieved from the electronic document file, computing an exposure score of the electronic document file based on the number of times for words associated with business information being searched and document level set-up information, assigning a document level to the electronic document file based on the exposure score, and inserting a watermark to text of the electronic document file to be displayed on the client device based on the user's personal information received from the server. Accordingly, leakage of business documents for electronic document files including business information can be prevented by providing pre-security and post-security measures stronger than conventional measures.

Abstract: The present invention provides a method for creating an electronic document file comprising monitoring creation and changes of an electronic document file, receiving a policy file including document level set-up information and security policy, searching for words associated with business information from the text data retrieved from the electronic document file, computing an exposure score of the electronic document file based on the number of times for words associated with business information being searched and document level set-up information, assigning a document level to the electronic document file based on the exposure score, and inserting a watermark to text of the electronic document file to be displayed on the client device based on the user's personal information received from the server. Accordingly, leakage of business documents for electronic document files including business information can be prevented by providing pre-security and post-security measures stronger than conventional measures.

Abstract: The method of controlling a defect of a hard disk drive that includes analyzing a defect type by using indexes of error corrected symbols after performing error correction with respect to each of a plurality of symbols and setting a sector as unusable when the sector includes a defect that is determined to be a defect having a defect type that is a hard defect.

Abstract: A method of adjusting gain of a variable gain amplifier of a read/write channel circuit includes loading a first VGA gain value that is read channel optimized, in a first register, loading a second VGA gain value that is adapted, in a second register, calculating a third VGA gain value according to a result of operation of the first VGA gain value and the second VGA gain value, and overwriting the third VGA gain value to the first register.

Abstract: A hard disk drive (HDD) includes a disk, a spindle motor assembly for rotating the disk, an arm assembly for reading data from and/or reproducing data onto the disk, integrated circuits (ICs) for controlling the spindle motor and arm assemblies, a printed circuit board (PCB) having integrated circuit (IC) mounting areas on which the ICs are mounted and a through-hole open to at least one of the IC mounting areas and a base to which the spindle motor assembly, arm assembly and PCB are assembled, the base including a heat dissipation column contacting the PCB opposite the IC mounting area so as to transfer heat generated by the IC to the base. The heat dissipation column includes a heat dissipation body and at least one hemispherical protrusion protruding from a surface of the body into the through-hole and into contact with the PCB.

Abstract: A disk drive, medium, and method controlling a write parameter of a disk drive are provided. The method of compensating for a write parameter, in order to control a write operation of a disk drive, can includes measuring a bit error rate in an optimum write condition and a bit error rate in a weak write condition for a head, and calculating a compensation value for a write parameter corresponding to a difference between the bit error rates in an optimum write condition and the bit error rate in the weak write condition. In a method, according to embodiments of the present invention, a compensation value alpha for compensating a write parameter for a predetermined period of time after the start of a write operation can be generated to prevent a weak write phenomenon at the beginning of the write operation.

Abstract: A hard disk drive (HDD) includes a disk, a spindle motor assembly for rotating the disk, an arm assembly for reading data from and/or reproducing data onto the disk, integrated circuits (ICs) for controlling the spindle motor and arm assemblies, a printed circuit board (PCB) having integrated circuit (IC) mounting areas on which the ICs are mounted and a through-hole open to at least one of the IC mounting areas and a base to which the spindle motor assembly, arm assembly and PCB are assembled, the base including a heat dissipation column contacting the PCB opposite the IC mounting area so as to transfer heat generated by the IC to the base. The heat dissipation column includes a heat dissipation body and at least one hemispherical protrusion protruding from a surface of the body into the through-hole and into contact with the PCB.

Abstract: A disk drive, medium, and method controlling a write parameter of a disk drive are provided. The method of compensating for a write parameter, in order to control a write operation of a disk drive, can includes measuring a bit error rate in an optimum write condition and a bit error rate in a weak write condition for a head, and calculating a compensation value for a write parameter corresponding to a difference between the bit error rates in an optimum write condition and the bit error rate in the weak write condition. In a method, according to embodiments of the present invention, a compensation value alpha for compensating a write parameter for a predetermined period of time after the start of a write operation can be generated to prevent a weak write phenomenon at the beginning of the write operation.