Abstract: Provided is a power amplifier which includes: a first transistor and a second transistor each having a first end connected to a first power source supplying a first voltage and to which signals having a same size but opposite polarities are input; a third transistor and a fourth transistor having first ends respectively connected to the first ends of the first transistor and the second transistor; and a fifth transistor having a first end connected to second ends of the third and fourth transistors and controlling oscillation of the third or fourth transistor.

Abstract: Provided is a control device of a LC circuit using a spiral inductor, comprising: a spiral inductor in which a first metal line connected to a first terminal and a second metal line connected to a second terminal cross at least one time to be connected in a spiral shape, and that includes at least one crossing part; at least one transistor in which a drain terminal and a source terminal are respectively connected to a first metal line portion and a second metal line portion that correspond to the crossing part; a variable capacitor that is connected to a first terminal and a second terminal of the spiral inductor in parallel; and a controller that respectively sends control signals to the transistor and the variable capacitor to control a resonant frequency or an output.

Abstract: The present invention provides a method for preparing carbon nanotube fibers with improved spinning properties using a surfactant and carbon nanotube fibers prepared by the method. According to the method for preparing carbon nanotube fibers of the present invention, the addition of a surfactant during the preparation of carbon nanotubes interrupts and delays the agglomeration of catalyst particles, which reduces the size of the catalyst particles and uniformly disperses the catalyst particles that play a key role in the formation of carbon nanotube fibers, thus increasing the strength and conductivity of carbon nanotube fibers and improving the spinning properties. While convention methods prepare carbon nanotube fibers by injecting a catalytic material for the synthesis of carbon nanotubes in a high-pressure supercritical state to be uniformly dispersed, the present invention uses a dispersant and thus does not require the injection in a high-pressure supercritical state.

Abstract: Disclosed is an apparatus for code obfuscation includes: an input unit that receives execution codes for android applications; a code analyzer that separates the input execution codes into sensitive codes that needs to be protected from application forgery attack and general codes except for the sensitive codes by analyzing the input execution codes; a dalvik to C code converter that creates native codes by converting the sensitive codes into a C code; an obfuscator that obfuscates the native codes and the general codes; a self code protector that encrypts the obfuscated native codes by adding a tamper-detection code to the obfuscated native codes and then creates self-modified native codes by adding a loading routine; and a code combiner that combines the self-modified native codes with the obfuscated general codes.

Abstract: Disclosed is an apparatus for code obfuscation includes: an input unit that receives execution codes for android applications; a code analyzer that separates the input execution codes into sensitive codes that needs to be protected from application forgery attack and general codes except for the sensitive codes by analyzing the input execution codes; a dalvik to C code converter that creates native codes by converting the sensitive codes into a C code; an obfuscator that obfuscates the native codes and the general codes; a self code protector that encrypts the obfuscated native codes by adding a tamper-detection code to the obfuscated native codes and then creates self-modified native codes by adding a loading routine; and a code combiner that combines the self-modified native codes with the obfuscated general codes.

Abstract: Disclosed is a transformer using a symmetrical printing pattern which includes: a substrate; a plurality of first printing lines printed at predetermined distances on the substrate; a plurality of second printing lines printed at predetermined distances on the substrate; first bonding wires connecting the first printing lines; and second bonding wires connecting the second printing lines, in which the first printing lines and the second printing lines are printed in a symmetrical printing pattern, respectively, on the substrate, and the first bonding wires and the second bonding wires are formed symmetrically, respectively.

Abstract: Provided are method and apparatus for authenticating a password of a user terminal by using a password icon. The method includes: method of authenticating a password of a user terminal, the method including: pre-setting, by a user, a password icon corresponding to a password and a moving direction of the password icon; sequentially moving the icon according to actions of the user at a screen of the user terminal; when the icon is sequentially moved, determining whether the pre-set password icon and the pre-set moving direction of the password icon are matched; and authenticating the password when the password icon and the moving direction of the password icon is sequentially matched.

Abstract: A method for measuring an ultrasonic viscosity includes applying a driving voltage to a plurality of first piezoelectric transducers provided along an outer wall circumference of a pipe at constant intervals to generate a torsional wave on a surface of the pipe, receiving the torsional wave propagated along the surface of the pipe through a plurality of second piezoelectric transducers provided along the outer wall circumference of the pipe at constant intervals while being spaced from the first piezoelectric transducers at a certain distance in a longitudinal direction of the pipe to convert the torsional wave into a voltage signal, calculating an attenuation and a propagation velocity of the torsional wave based on the time for the propagation of the torsional wave and the converted voltage signal, and measuring viscosity of the fluid in the pipe based on the calculated attenuation and propagation velocity of the torsional wave.

Abstract: Provided is a power voltage supply apparatus of a 3-dimensional (3D) semiconductor. The power voltage supply apparatus includes a plurality of integrated circuits (ICs) which each include a first through silicon via (TSV) and a second TSV, are stacked such that the first TSVs are connected and second TSVs are connected, and are mounted on a printed circuit board (PCB), wherein a first PCB line formed on the PCB and supplying a first voltage is connected to a bottom of a first TSV of a bottom IC from among the plurality of ICs, and a second PCB line formed on the PCB and supplying a second voltage is connected to a top of a second TSV of a top IC.

Abstract: Disclosed is a slew rate control device using a switching capacitor which includes a first capacitor that is connected to a target circuit operated in response to a clock signal, and controls a rising slope of a signal output from the target circuit when the clock signal is in a high state; a switch that is connected to the first capacitor in parallel, receives a reverse signal of the clock signal, as a control signal, and is turned on when the clock signal is in a low state; and a second capacitor that is connected to the switch in series, and controls a falling slope of the signal output from the target circuit when the clock signal is in the low state.

Abstract: An image-quality improvement method is provided. The image-quality improvement method includes detecting an area of interest from an input image; generating a color distribution map based on a plurality of respective brightness elements and a plurality of respective chroma elements of a plurality of pixels which belong to a predetermined color series and which are in the detected area of interest of the input image; determining a first area, which belongs to the predetermined color series, and a second area, which is an area of the input image other than the first area, according to the color distribution map; and changing values of a plurality of pixels in at least one of the first area and the second area.

Abstract: Provided is a method of detecting important information from a moving picture. The method includes: detecting first candidate areas that are presumed to include important information in a plurality of moving picture frames by using stop edge information, which is edge information overlapped at a same position throughout the plurality of moving picture frames, from among edge information in at least two received moving picture frames; determining second candidate areas by performing grouping on the stop edge information according to a position of the stop edge information in the first candidate areas; analyzing the second candidate areas determined in the at least two moving picture frames; and detecting important information areas from each of the at least two moving picture frames based on the analysis.

Abstract: Disclosed is a power estimation device using a coaxial winding transformer which includes: a switching control unit that generates primary current by performing switching control on power source; a coaxial winding transformer that includes a core, and a primary winding, a secondary winding, and an auxiliary winding which are wound on the core and outputs secondary current in accordance with the winding ratio of the secondary winding to the primary winding by receiving the primary current; and a power estimation unit that estimates power outputted to the secondary winding by sensing output of the auxiliary winding in accordance with the winding ratio of the auxiliary winding to the primary winding, in which the coaxial winding transformer is formed by winding a cable, which uses at least inner conductor as the secondary winding and uses one outer conductor surrounding the inner conductor as the auxiliary winding, around the core.

Abstract: Disclosed is a combination-type transistor including a first MOSFET that includes a gate, a first source formed on one side of the gate, and a first drain formed on the other side of the gate; a second MOSFET that includes the gate, a second drain formed on the one side of the gate, and a second source formed on the other side of the gate; a first BJT that is formed such that the first source of the first MOSFET is used as an emitter, the second drain of the second MOSFET is used as a collector, and the substrate is used as a base; and a second BJT that is formed such that the second source of the second MOSFET is used as an emitter, the first drain of the first MOSFET is used as a collector, and the substrate is used as a base.

Abstract: Provided is an integrated circuit (IC) having a stacked structure. The IC includes: a first IC having a power input terminal to which a power supply voltage is applied; and a second IC having a power input terminal connected to a ground terminal of the first IC, having a central node formed as the power input terminal of the second IC and the ground terminal of the first IC are connected to each other and to which a voltage is applied, and having a ground terminal connected to a ground source, wherein the power supply voltage is divided into first and second voltages that are respectively applied to the first and second ICs.

Abstract: Titanium suboxide (TixO2x-1) nanoparticles useful as a support for a catalyst electrode of a fuel cell, and a method for synthesizing the titanium suboxide (TixO2x-1) nanoparticles by using TiO2, a Co catalyst and hydrogen gas at a low temperature ranging from 600 to 900° C. are described Since the titanium suboxide nanoparticles show high corrosion resistance to acid and durability and have excellent thermal and electric conductivities, a catalyst electrode manufactured by using the same as a support exhibits improved catalytic activity and oxidation reduction (redox) properties.

Abstract: Disclosed is a multi-gate transistor which includes a plurality of gates that is branched from one port, that is alternately formed to face each other, and in which currents flow in the adjacent gates in an opposite direction to each other; a source that is formed on one side or the other side of each of the plurality of gates; and a drain that is formed on the other side or the one side of each of the plurality of gates.

Abstract: Disclosed is a differential power amplifier using mode injection, which includes: a first transistor of which the gate receives a first signal and the source is connected to the ground; a second transistor of which the gate receives a second signal and the source is connected to the ground; a third transistor of which the source is connected to the source of the first transistor; a fourth transistor of which the source is connected to the source of the second transistor; a fifth transistor of which the source is connected with the drain of the first transistor and the drain is connected with a first output port and the drain of the third transistor; and a sixth transistor of which the source is connected with the drain of the second transistor and the drain is connected with a second output port and the drain of the fourth transistor.

Abstract: Disclosed is a method of manufacturing an intraocular pressure sensor that is put into an eyeball of a patient and measures the intraocular pressure, the method comprising: preparing a first substrate; depositing a base film on the bottom of the first substrate; exposing the top of the base film by etching the first substrate; applying epoxy onto the center of the exposed base film; disposing the first electrode at the epoxy-applied portion on the base film; preparing a second substrate; depositing a support film onto the second substrate; forming a second electrode on the support film; exposing the bottom of the support film by etching the second substrate; and disposing the second substrate onto the first substrate.

Abstract: Disclosed is a linear amplifier which includes: a common source transistor with the gate connected with an input node; a first common gate transistor connected with the common source transistor in a cascode type, with the drain connected with an output node; and a second common gate transistor connected in parallel with the first common gate transistor, with the gate connected with the input node and the drain connected with the output node.