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Hyo Keun
Hyo Keun Bae, Sungnam KR
| Patent application number | Description | Published |
|---|---|---|
| 20080309411 | RADIO FREQUENCY SIGNAL AMPLIFYING DEVICE - There is provided a radio frequency (RF) signal amplifying device consuming less power and operable at a high voltage in a PA driving amplifying apparatus applicable to a PA amplifying circuit which amplifies power of an RF signal. The RF signal amplifying device includes: a balun converting an unbalanced radio frequency signal into a balanced radio frequency signal; a primary amplifier differentially amplifying the balanced radio frequency signal from the balun; and at least one secondary amplifier secondarily and differentially amplifying the balanced radio frequency signal amplified from the primary amplifier. | 12-18-2008 |
| 20090085705 | TRANSFORMER - A transformer including: a multilayer board; one or more input conductive lines formed on the multilayer board, whose both ends connected to input terminals of a positive signal and a negative signal, respectively; one output conductive line formed adjacent to the one or more input conductive lines to form an electromagnetic coupling with the one or more input conductive lines, whose one end is connected to an output terminal and another end is connected to a ground; a power supply pad formed in an area of the one or more input conductive lines; and a harmonics remover formed between the one end and the another end of the output conductive line to remove harmonics components of a signal outputted from the output conductive line, wherein a part of the one or more input conductive lines is formed on a top surface of the multilayer board and rest of the one or more input conductive lines is formed on a different layer from the top surface of the multilayer board, which are connected to each other via a via hole, and a portion of the output conductive line is formed on the top surface of the multilayer board and another portion of the output conductive line is formed on the different layer from the top surface of the multilayer board, which are connected to each other via the via hole, not to be directly connected to the one or more input conductive lines. | 04-02-2009 |
Hyo Keun Kim, Suwon-Si KR
| Patent application number | Description | Published |
|---|---|---|
| 20090244742 | MIRROR DEVICE FOR SUN VISOR OF VEHICLE - The present invention relates to a mirror device for a sun visor of a vehicle, in which when a cover of a mirror mounted to a sun visor is opened or closed, the mirror can be operated smoothly and completely, comprising: a mirror housing having a mirror and a cover sliding from the mirror housing to open or close the mirror, wherein the mirror housing and the cover are coupled to each other by an elongation member. Accordingly, the cover moves smoothly in a semi-automatic sliding manner by means of an elastic body, thereby restraining noise from being generated. | 10-01-2009 |
Hyo Keun Park, Yongin-Si KR
| Patent application number | Description | Published |
|---|---|---|
| 20090000510 | INK COMPOSITION FOR INKJET RECORDING, INK CARTRIDGE INCLUDING THE INK COMPOSITION, AND INKJET RECORDING APPARATUS INCLUDING THE INK CARTRIDGE - An ink composition is provided for inkjet recording including a compound represented by Formula 1, a coloring agent, and water, the ink composition having characteristics that prevent formation of depositions therein over time to obtain high storage stability and good ejection properties. | 01-01-2009 |
| 20090288579 | INK COMPOSITION, INK CARTRIDGE INCLUDING THE INK COMPOSITION, AND INKJET RECORDING APPARATUS INCLUDING THE INK CARTRIDGE - Provided is an ink composition including a colorant; a solvent; a surfactant; and an oxygen absorber of a hetero ring compound and a hydroxylamine-based compound. The oxygen absorber lowers a concentration of oxygen dissolved in the ink composition and maintains a low level even when the ink composition is in a high-temperature condition. Thus, gas is substantially not generated and bubbles are not formed. The ink composition can be stably ejected during high-speed printing. | 11-26-2009 |
| 20110052278 | FUSING UNIT AND IMAGE FORMING APPARATUS HAVING THE SAME - A fusing unit which includes a pressure member to be elastically supported on an outer peripheral surface of a heating roller while coming into surface contact with the outer peripheral surface. The pressure member serves to grind the outer peripheral surface of the heating roller, to maintain a surface roughness of the heating roller at a predetermined level or less. | 03-03-2011 |