Abstract: Disclosed are a method of and an apparatus for 3D visualization of the root canal curvature of a tooth. The method includes (a) displaying a CT image of one or more teeth on the basis of CT image data, (b) three-dimensionally rendering at least a portion of the root canal of a target tooth when a dental practitioner selects the target tooth from the CT image, and (c) visualizing a curvature in a region of the root canal that is three-dimensionally rendered using a visual factor.

Abstract: Disclosed are a method of and an apparatus for 3D visualization of the root canal curvature of a tooth. The method includes (a) displaying a CT image of one or more teeth on the basis of CT image data, (b) three-dimensionally rendering at least a portion of the root canal of a target tooth when a dental practitioner selects the target tooth from the CT image, and (c) visualizing a curvature in a region of the root canal that is three-dimensionally rendered using a visual factor.

Abstract: A device and method for controlling a power supply. The method includes: a voltage signal in a primary winding is delayed, and the delayed voltage signal is sampled and held after a time when a rectifying diode stops conducting a current, then the sampled and held signal is used as a feedback signal of the power supply. Therefore, only one sampling and holding circuit is needed, the area of the circuit can be reduced and the cost of the integrated circuit can be decreased, meanwhile regulation characteristics are not deteriorated.

Abstract: A device and method for controlling a power supply. The method includes: a first correction signal is generated according to a down-slope waveform and a second correction signal is generated according to an up-slope waveform, in a period of the switching element. Therefore, two kinds of corrections can be performed by using an oscillator, while the area of the circuit can be reduced and the cost of the integrated circuit can be decreased.

Abstract: A device and method for controlling a power supply. The method includes: monitoring a feedback signal of a feedback terminal; determining whether the feedback signal of the feedback terminal is not a pulse signal; and terminating an on/off operation of a switching element when the feedback signal of the feedback terminal is not a pulse signal. Therefore, an abnormal status of the device can be correctly detected with a simple structure when the feedback terminal is open or is shorted with other terminals, while an error operation and a damage of the device can be avoided.