Abstract: To form a bottom electrode of a capacitor of a semiconductor device, a first insulation layer pattern having a first contact hole is formed on a substrate, and a contact plug for the bottom electrode is formed in the contact hole. A second insulation layer is formed on the first insulation layer pattern and the contact plug. The second insulation layer has a second etching rate higher than a first etching rate of the first insulation layer pattern. The second insulation layer is etched to form a second insulation layer pattern having a second a contact hole exposing the contact plug. A conductive film is formed on the sidewall and the bottom face of the second contact hole. According to the difference between the first etching rate and the second etching rate, the etching of the first insulation layer pattern near the contact plug is reduced.

Abstract: A field effect transistor includes a channel region under a gate stack formed on a semiconductor structure. The field effect transistor also includes a drain region formed with a first dopant doping a first side of the channel region, and includes a source region formed with the first dopant doping a second side of the channel region. The drain and source regions are doped asymmetrically such that a first charge carrier profile between the channel and drain regions has a steeper slope than a second charge carrier profile between the channel and source regions.

Abstract: The present invention provides a reflective type liquid crystal display device and fabricating method thereof, by which resolution is enhanced in a manner of representing two colors from one sub-pixel. The present invention includes a first substrate having a plurality of thin film transistors and a plurality of pixel electrodes within a plurality of sub-pixels defined by a plurality of gate and data lines perpendicularly crossing with each other, respectively, a second substrate assembled to the first substrate to confront, a liquid crystal layer between the first and second substrates, a third substrate assembled to the first substrate to confront, a plurality of reflective electrodes on an inside of the third substrate to correspond to a plurality of the sub-pixels, respectively, and a color filter layer having a plurality of electrophoretic bodies on a plurality of the reflective electrodes wherein each of the electrophoretic bodies is micro-encapsulated with ionic pigment particles.

Abstract: The present invention relates to a wind generator. The wind generator comprises a body installed freely rotatably at a tower, blades installed at a leading end of the body, a gearbox for receiving rotational forces from the blades, and a generator connected to the gearbox for generating electricity. The blades are coupled with a blade angle adjustment unit so that the angles of the blades can be adjusted at predetermined angles according to the directions and velocities of winds. The gearbox comprises a planet gear coupled with a rotational shaft of the blades, a ring gear which has teeth formed on a radially inner surface thereof and engages with the planet gears, and a sun gear which engages with the planet gear and is connected with the generator. Teeth are formed on a radially outer surface of the ring gear so that teeth of a stop gear can be engaged therewith.

Abstract: To form a bottom electrode of a capacitor of a semiconductor device, a first insulation layer pattern having a first contact hole is formed on a substrate, and a contact plug for the bottom electrode is formed in the contact hole. A second insulation layer is formed on the first insulation layer pattern and the contact plug. The second insulation layer has a second etching rate higher than a first etching rate of the first insulation layer pattern. The second insulation layer is etched to form a second insulation layer pattern having a second a contact hole exposing the contact plug. A conductive film is formed on the sidewall and the bottom face of the second contact hole. According to the difference between the first etching rate and the second etching rate, the etching of the first insulation layer pattern near the contact plug is reduced.

Abstract: Disclosed is a method for preparing dimethyl dipropargylmalonate polymer containing exclusively six-membered ring structure by using supercritical or sub-critical carbon dioxide as a solvent with a transition metal chloride catalyst.

Abstract: The paper transferring mechanism includes a drive gear coaxially coupled with a rotation shaft of a motor, a pick-up gear coupled with a shaft of a pick-up roller to separately feed the paper sheets, and a feed gear coupled with a shaft of a feed roller to outwardly transfer the paper sheets. The paper transferring mechanism also includes a discharge gear coupled with a shaft of a discharge roller to outwardly discharge the paper sheets, and a swing gear having one end connected to the drive gear and the other end selectively connected to one of the pick-up gear and the feed gear. The pick-up gear is rotated when the motor is rotated in a first direction, the feed gear is rotated when the motor is rotated in a second direction, and the discharge gear is rotated constantly in one direction regardless of the rotation direction of the motor.

Abstract: There is provided a paper pickup device in a paper feeding cassette having a knock-up plate. In the paper pickup device, a first curved slot is formed on a frontal portion of each sidewall of the paper feeding cassette, a second curved slot is formed above the first slot on one sidewall of the paper feeding cassette, a shaft is protrusively inserted into the first slots from the inside of the paper feeding cassette, a connecting member is rotatably connected to the sidewalls of the paper feeding cassette by hinges, and has a first engaging portion extended upward from a body thereof and a second engaging portion horizontally spaced from the first engaging portion by a predetermined distance and a sub-plate is extended from the connecting member under the knock-up plate, for pressing upward the knock-up plate.

Abstract: The present invention is directed to an envelope pressing device in a printer having a paper cassette which is loaded with a plurality of envelopes and feeds the envelopes one by one by means of a pickup roller. The envelope pressing device includes a hinge shaft rotatably connected to the lower surface of a body frame. In the device, a pressing plate is rotatably connected to the hinge shaft for pressing down on the envelopes. The pressing plate has first and second holes of a predetermined size formed on both side surfaces thereof and a slot formed on one side surface thereof. A lever shaft is inserted into the first and second holes. A lever plate is fixed to an end of the lever shaft and has a third hole formed on a side surface thereof and a fourth hole formed below the third hole. A first spring is wound around the lever shaft and has one end inserted into the third hole and the other end inserted into the slot of the pressing plate.