摘要:
Provided are a system and a method for monitoring welding operations. The system includes a welding machine, a current sensor sensing an operation time of the welding machine and a welding current, a welding information database storing information of the operation time of the welding machine and the welding current for each welding operator and storing information of a consumed charge amount of the welding machine, which is preset for each welding operation process, a data analyzer checking a charge amount consumed for the operation time by using the sensed operation time of the welding machine and the welding current and determining whether the welding operator achieves a task goal of a corresponding process by comparing the checked consumed charge amount with the preset consumed charge amount for a process performed by the welding machine, and a display unit outputting a result of the determining, performed by the data analyzer, whether the welding operator achieves a task goal of a corresponding process.
摘要:
An apparatus and method for distinguishing between tack-welding and welding are provided. The apparatus for distinguishing between tack-welding and welding includes: a current sensor configured to detect arc current of a welder; and a distinguish control unit configured to distinguish whether a welding operation performed by the welder is tack-welding or welding based on the arc current detected by the current sensor for a predefined period of time. Accordingly, the amount of work performed by a welding worker can be fairly and accurately evaluated.
摘要:
Provided is an anti-collision method and apparatus used during wireless power transmission with respect to a plurality of target devices. According to one general aspect, an anti-collision method in wireless power transmission may include: transmitting, from a source device to one or more target devices, an access standard instruction including an access standard that is used for identifying the target devices; transmitting, to the one or more target devices, a call parameter used to detect identifications (IDs) of the target devices, generated based on the access standard; and assigning, to the one or more target devices, control IDs based on response signals that the one or more target devices transmits in response to the call parameter.
摘要:
A driving circuit includes a plurality of stages driven in response to a start signal. Each normal stage outputs a gate signal and a carry signal, increases an electric potential of a node in response to a previous carry signal of a previous stage, and decreases the gate signal to a first voltage in response to a carry signal from a next stage. Each stage applies a second voltage lower than the first voltage to the node in response to receipt of a carry signal from a second next stage. A first dummy stage outputs a first dummy carry signal to the last two normal stages in response to a last carry signal from the last normal stage and the start signal, and a second dummy stage outputs a second dummy carry signal to the last normal stage in response to the first dummy carry signal and the start signal.
摘要:
A method of driving a lamp of a liquid crystal display device includes generating a control signal; generating a first drive signal using the control signal; generating a second drive signal by shifting a voltage level of the first drive signal; selectively outputting one of a high potential supply voltage and a low potential supply voltage in response to the second drive signal; transforming the selectively outputted voltage; and supplying the transformed voltage to a lamp.
摘要:
A method of driving a lamp of a liquid crystal display device includes generating a control signal; generating a first drive signal using the control signal; generating a second drive signal by shifting a voltage level of the first drive signal; selectively outputting one of a high potential supply voltage and a low potential supply voltage in response to the second drive signal; transforming the selectively outputted voltage; and supplying the transformed voltage to a lamp.
摘要:
A light emitting package is disclosed that can generate a white light while controlling Red, Green and Blue light emitting diodes (“LEDs”) simultaneously. In the light emitting package, a plurality of LEDs are connected in series to one another. The plurality of LEDs are responsive to one driving voltage. Currents flowing through the plurality of LEDs are controlled by a current adjuster. Consequently, the plurality of LEDs are driven by the currents different from one another in amount.
摘要:
A method of driving a lamp of a liquid crystal display device includes generating a control signal; generating a first drive signal using the control signal; generating a second drive signal by shifting a voltage level of the first drive signal; selectively outputting one of a high potential supply voltage and a low potential supply voltage in response to the second drive signal; transforming the selectively outputted voltage; and supplying the transformed voltage to a lamp.
摘要:
An apparatus and method for testing mechanical endurance of a surface of an optical disc are disclosed. The apparatus includes a rotating plate, on which an optical disc to be scratched is loaded, for rotating the loaded optical disc, and a plurality of abrasion wheels of a predetermined type, disposed at a perpendicular to the rotating plate, for contacting the optical disc and generating the scratch, the scratch being generated when the optical disc rotates a predetermined number of turns, e.g., maximum of 5 turns for the abrasion wheels to apply a predetermined load on the optical disc.