Abstract:
The present invention provides a process for fabricating a field emitter electrode, comprising the steps of: impregnating a cathode and anode in an electrolyte containing carbon nanotubes dispersed therein and applying a predetermined voltage to the cathode and anode so as to deposit carbon nanotubes on a substrate provided on the anode; recovering the substrate and applying a conductive polymer onto the surface of the substrate having carbon nanotubes deposited thereon; and heat treating them to cure the conductive polymer.
Abstract:
The present invention provides a wavelength-convertible LED which has first and second surfaces, including first and second conductivity-type cladding layers and an active layer formed between the first and second conductivity-type cladding layers to emit a specific wavelength light. The invention also includes at least a piezoelectric layer on at least one of the first and second surfaces of the semiconductor LED with its thickness variable according to the applied voltage, and a rigid frame made of substantially non-resilient rigid material surrounding the semiconductor LED and the at least one piezoelectric layer such that the increase of the thickness of the piezoelectric layer is applied to the semiconductor LED as pressure. The invention further includes a plurality of terminals on the rigid frame, connected to the first and second conductivity-type cladding layers, and the piezoelectric layer.
Abstract:
Embodiments of the present invention may provide a CFR apparatus and method in a communication system. The CFR apparatus may include a clipping noise generating device to generate a clipping noise signal for a communication signal based on a clipping threshold value, and a clipping control device to control the clipping threshold value in accordance with an average power of the communication signal
Abstract:
A field emitter array, and a method for manufacturing the same are provided. The field emitter array comprises a nickel substrate, and a plurality of nano-pillars extending perpendicular to the nickel substrate. Each of the nano-pillars comprises a nickel nano-pillar body integrated to the nickel substrate and extending perpendicular to the nickel substrate, and an upper portion of the nano-pillar comprising a CNT-nickel composite material. At least one CNT is exposed from an upper surface of the upper portion of the nano-pillar. Since the CNTs are provided on the upper surface of the nano-pillars, field emission efficiency can be further enhanced. Additionally, since the substrate, and the nano-pillars extending perpendicular to the substrate are integrated and formed of the same material, contact resistance between the substrate and the nano-pillars is reduced, thereby enhancing the field emission efficiency.
Abstract:
The present invention provides a method of manufacturing a field emitter electrode as well as a field emitter electrode manufactured thereby. The method comprises preparing a plating solution containing carbon nanotubes dispersed therein, immersing a positive electrode and a negative electrode including a substrate which has been surface-treated so as to provide nucleation sites for the carbon nanotubes, in the plating solution, and applying a given voltage between the negative and positive electrodes so as to form a carbon nanotube-metal plating layer on the substrate.
Abstract:
A regenerative braking method for a vehicle having an electric motor. During an initial stage of a regenerative braking operation related to the vehicle having the electric motor, a flow rate of brake liquid as much as the amount of regenerative braking is delivered into a reservoir through opened exit valves of non-driving wheels, so as to generate a hydraulic braking force needed after subtracting the amount of regenerative braking from the amount of braking desired by a vehicle operator. When the amount of regenerative braking increases, exit valves of driving wheels are controlled to fulfill the total amount of braking desired by the vehicle operator. Also, when the amount of regenerative braking decreases, wheel pressures have to be increased to fulfill the vehicle operator's desire to brake. In the regenerative braking method for generating a residual amount of braking needed after subtracting the amount of regenerative braking, which corresponds to an amount generated by the electric motor, from the amount of braking desired by the vehicle operator, during the regenerative braking operation, based on a pressure difference between a pressure in the master cylinder and wheel pressures, entrance valves of the driving wheels are controlled to realize an operator's pedal feeling, and the exit valves of the driving wheels are controlled to allow the wheel pressures to follow a target pressure.
Abstract:
The invention provides a method for manufacturing a crystalline dielectric film by which the crystalline dielectric film can be formed at a low temperature of 300° C. or less. In the manufacturing method of the invention, first, an amorphous dielectric film is formed on a substrate. Then, the amorphous dielectric film is immersed into water to be hydrothermally treated.
Abstract:
The present invention provides a process for fabricating a field emitter electrode, comprising dispersing carbon nanotubes and a conductive polymer in DI (deionized) water to prepare a carbon nanotube mixture having a viscosity of 50 to 100 cps; applying the carbon nanotube mixture to a substrate; and heat treating the carbon nanotube mixture to form a conductive polymer layer including carbon nanotubes.
Abstract:
The present invention provides a method of manufacturing a field emitter electrode using self-assembling carbon nanotubes as well as a field emitter electrode manufactured thereby. The method comprises anodizing an aluminum substrate to form an anodized aluminum oxide film having a plurality of uniform pores on the aluminum substrate, preparing an electrolyte solution having carbon nanotubes dispersed therein, immersing the anodized aluminum substrate in the electrolyte solution and applying a given voltage to the aluminum substrate as one electrode, so as to attach the carbon nanotubes to the pores, and fixing the attached carbon nanotubes to the pores.
Abstract:
A method and apparatus for enhancing the call access rate in a communication system generates a pilot signal from a FPGA (Field Programmable Gate Array) integrated with a multi-carrier digital transceiver, produces a phase-equalized beacon signal from said generated pilot signal, and multiplies the phase-equalized beacon signal by a predetermined oscillation frequency generated by a NCO (Numerical Control Oscillator). The NCO output is summed up with a pre-distorted user data output signal. The summed up signal is rearranged for synchronization and power amplification.