摘要:
A retract control method of an HDD to prevent a head from landing on a disk due to a retract failure and an HDD using the same. The retract control method includes performing a retract operation of retracting a head on the ramp, determining whether the head is normally retracted on the ramp, when it is determined that the head is not normally retracted on the ramp, moving the head to a predetermined zone of a disk, and when the head arrives at the predetermined zone of the disk, parking the head in the predetermined zone of the disk by stopping a spindle motor. Accordingly, even when a retract operation fails, a reliable retract operation can be performed by retrying the retract operation while adjusting one or more retract parameters.
摘要:
The present invention provides an indene derivatives having a new structure and an organic light-emitting diode using the same. The organic light-emitting diode according to the present invention shows improved effects in efficiency, driving voltage and stability.
摘要:
A method and an apparatus for water management in a direct methanol fuel cell system using a heat exchanger and including a pipe for connecting a cathode outlet of a fuel cell stack with a mixer. The method includes: measuring an output voltage and/or an output current of the fuel cell stack; extracting a concentration value of the mixed fuel corresponding to the measured output voltage and/or current from a look-up table; comparing the extracted concentration value of the mixed fuel with a reference concentration value; and forcibly cooling a fluid flowing in a pipe for a time period by a heat exchanger coupled to the pipe when the extracted concentration value of the mixed fuel is higher than the reference concentration value.
摘要:
A wafer apparatus including a heating plate, a case supporting and containing the heating plate, pressing arms laid across the case and the heating plate, and arm controlling units vertically moving the pressing arm toward the case. A plurality of the pressing arms and the arm controlling units are disposed along the circumference of the heating plate and may compensate a portion protruded upward due to the warpage of the heating plate by pressurizing. The warpage of the heating plate can be effectively compensated, and a wafer can be heated with a uniform temperature.
摘要:
Disclosed herein are novel imidazole derivatives and organic electronic device using the same. The disclosed organic electronic device show excellent characteristics in terms of efficiency, driving voltage and stability.
摘要:
The present invention relates to a novel method for preparing a catalyst for partial oxidation of methlybenzenes, comprising, (a) a step of preparing a solution or slurry of the compounds comprising tungsten (b) a step of supporting the solution or slurry obtained in the step (a) on inorganic carrier; (c) a step of drying the catalyst obtained in the step (b); and (d) a step of calcining the dried catalyst obtained in the step (c), characterized in that the ratio of the pore volume of inorganic carrier and the volume of the solution or slurry in the step (b) is 1:09˜1.1, and the catalyst provides superior aromatic aldehydes selectivity to those prepared by the conventional impregnation or heat evaporation method over a wide range of conversion rate.
摘要:
A method of detecting 3D measurement data using an allowable error zone is provided. The method detects 3D measurement data that corresponds to a preset measurement allowable error zone for each basic diagram when detecting 3D measurement data. For that purpose, a control unit generates auxiliary geometry data from a design data storage unit on the basis of analysis information of the design data; sets an allowable error zone for measurement in the auxiliary geometry data on the basis of allowable error information inputted from a user interface; controls a coordinate system of measurement data to coincide with a coordinate system of design data of the object; extracts candidate point groups included in the allowable error zone for measurement of the auxiliary geometry data from the measurement data; and fits the candidate point groups extracted from the candidate point groups included in the allowable error zone for measurement to output the fitted candidate point groups to the user interface.
摘要:
An image capturing device including a zoom control unit with a variable zoom speed feature. The image capturing device includes a case having a manipulation hole, a holder provided inside the case, a knob, a plurality of quantum tunnelling composites (QTCs) housed in the holder, and a PCB. The knob is rotatably supported by the holder while having a portion exposed through the manipulation hole. Resistance of the QTC changes according to pressure applied from the knob. A plurality of current detectors is mounted on the PCB to detect current flowing through the QTCs. Voltage is applied across positive and negative electrodes formed on each QTC. No current flows through the QTC when no pressure is applied, and its resistance gradually decreases and current flowing therethrough gradually increases as pressure is applied. Each current detector detects the current and changes zoom speed in multiple steps according to the detected current.
摘要:
There are provided a pump of a noise suppression and vibration proof structure and a fuel cell system using the same. The fuel cell system includes at least one electricity generator including an electrolyte membrane and an anode and a cathode attached to the both surfaces of the electrolyte membrane to generate electricity energy by the electrochemical reaction between fuel containing hydrogen and oxidant supplied to the anode and the cathode, a fuel supplying unit including a pump for supplying the oxidant to the electricity generator, and a fixed frame that is provided on a lower frame and to which the pump is fixed. The pump is separated from the lower frame and is fixed to and combined with the fixed frame by the belt-shaped fixing member on the side surface of the fixing frame with a buffering member interposed. Therefore, it is possible to reduce the noise and vibration of the pump.
摘要:
A fuel tank and a cap device for the fuel tank. The fuel tank is connected to a fuel cell and includes a tank body having a fuel opening and a pin hole for maintaining an inside pressure, a floater positioned on a surface of the fuel stored in the tank body, and an air pipe connected to the pin hole and an upper part of the floater. The cap device includes a cap body having an inside transfer path for connecting an inlet opening for introducing the fuel and an outside transfer pipe, a fixed outer cap including a connector for fixing a discharge opening into which the transfer pipe is inserted, and an elastic opening/closing section in which the cap body is elastically compressible by the connector, and wherein the inside transfer path opens during the compression.