baber/WOPTO huggingface dataset:
Patent KR-20030053343-A (KR)
Inventor: KIM GYEONG HWAN
IPC: H01L21/3065
Filed: 2001-12-22
Abstract: PURPOSE: A heater system for a wafer is provided to prevent ununiform temperature variation caused by a long-term use and stabilize the entire system by changing a wafer heating unit from a halogen lamp type to an electrode heater block type. CONSTITUTION: A chuck for settling the wafer(10) is installed in the electrode heater block. Each line connected to the electrode heater block is connected to an alternating current(AC) power(34) for power supply and a proportional-integral-differential(PID) control(36). Each line connected to the heater block is vacuum-sealed in a window. The material of the electrode heater block is composed of an electrode processed with aluminum or ceramic.
Patent KR-20020023853-A (KR)
Inventor: YOO HO SANG
IPC: E05B53/00
Filed: 2001-12-24
Abstract: PURPOSE: A door lock system, a controlling method thereof, and a multifunctional door key therefor are provided to automatically open and close a door of a house using a wire and a wireless telephone. CONSTITUTION: A wire and a wireless telephone(10) is installed at an interior of a house. A door phone(20) is connected to a camera through a wire. The camera is installed at a door to be opened/closed, that is, at an entrance of a house. The door phone(20) confirms a visitor through the camera. The door phone(20) includes a driving key for opening/closing the door. A multifunctional door key(100) requests an opening/closing of the door and communicates with the wire and the wireless telephone(10). The multifunctional door key(100) emits a predetermined frequency signal to an area of a predetermined range so that the wire and the wireless telephone(10) receive the signal. The predetermined frequency signal has a corresponding key code for performing any one operation among opening or closing of the door according to a user's key operation.
Patent KR-20030054512-A (KR)
Title: The Apparatus for Preventing Transfer Car from Overturning in Multiple Accessing Coil Yard
Inventor: KANG SEONG MAN
IPC: B65G25/00
Filed: 2001-12-26
Abstract: PURPOSE: An overturn preventive apparatus of a multiaccess trolley by using tension is provided to stack or transfer coils by restricting overturn or fall of an FDC(feeder car), and to protect the equipment by preventing damage of the trolley. CONSTITUTION: An overturn preventive device is composed of a wire belt part including a first wire belt(34) wound on an outer shaft bearing wheel outside stoppers(16,16-1) to move a horizontal rod part on an FDC passage(7), and a second wire belt(35) wound on the outer shaft bearing wheel to turn between the stopper and the first wire belt; a tension bridle part mounting plural outer shaft bearing wheels turning by winding first and second wire belts on a bridle body(41) fixed on the FDC passage; and the horizontal rod part preventing overturn of a trolley and over travel by moving a vertical rod(51) between stoppers through the tension bridle part. The coil is transferred and stacked stably by restricting over travel or fall of the trolley.
Patent KR-20030054843-A (KR)
Title: Apparatus for controling liquid air level in oxygen manufacturing device
Inventor: KANG SEUNG IK
IPC: F25J3/04
Filed: 2001-12-26
Abstract: PURPOSE: A liquefied air level control apparatus in oxygen manufacturing facility is provided to prevent clogging of the tank generated as carbon dioxide and hydrocarbon generated in the manufacturing process of the oxygen manufacturing facility are being accumulated in the lower part of tank of air separator for storing liquefied air. CONSTITUTION: The liquefied air level control apparatus in oxygen manufacturing facility comprises a differential pressure detection part connected to low pressure line(13) and high pressure line(14) of level transmitter(10) to judge whether there is something wrong or not by checking variation of differential pressure; a warming unit part connected to the high pressure line to melt carbon dioxide and hydrocarbon in the solid state inside air separator(2); and a discharge part connected to the differential pressure detection part to discharge the carbon dioxide and hydrocarbon melted by the warming unit part by opening discharge valve according to closing signals of the high pressure line, wherein the differential pressure detection part comprises differential pressure transmitter(100), and control part(103) comprising analog input part, alarm control part, sequence control part and digital output part, wherein the warming unit part comprises an entrance line(104), a warming unit(105), an exit line(106), an exit valve(107) and a plurality of radiating plates(108), and wherein the discharge part comprises a discharge valve(200), a discharge portion(202), an exit line(203) and a cutout valve(201).
Patent KR-20030054970-A (KR)
Title: An apparatus for binding a coil automatically
Inventor: HONG JONG IN
IPC: B65B27/06
Filed: 2001-12-26
Abstract: PURPOSE: An automatic binding apparatus for a coil is provided to transport coil products actively, and to prevent accidents of workers by binding the coil product firmly and promptly without manual operation in packing. CONSTITUTION: An automatic binding system comprises a frame part having first and second main shafts(24a,24b) rotated and installed in a frame(22) moving back and forth at both sides of a coil product of a lifting machine; a first binding part(40) having a first band guide plate(44) installed in a first base(42) fixed horizontally in the front of the first main shaft, and a guide plate(48) guiding tightening of the coil of a band passing the guide plate by a cylinder(46) installed in the first base; and a second binding part(70) having a welding machine(76) and a band feeder(78) moving back and forth in upper and lower parts of the base, and a band dispenser(80) installed in the rear part of the second base to supply the band to the guide plate. The productivity is increased, and accidents are prevented by binding the product automatically and promptly.
Patent KR-20010079555-A (KR)
IPC: H04M3/436
Filed: 1999-07-23
Abstract: 본 발명은 대화식 서비스를 제공하는 음성 브라우저에 대한 것이다.  본 발명에 따른 마크업 언어 문서는 다수의 마크업 언어 요소들을 포함하는 대화 요소를 포함한다.  다수의 마크업 언어 요소들은 각각 적어도 하나의 마크업 태그에 의해 식별할 수 있다.  단계 요소는 대화 요소에 포함되어 대화 요소 안에서 상태를 정의한다.  단계 요소는 프롬프트 요소와 입력 요소를 포함한다.  프롬프트 요소는 사용자에게 읽혀지는 고지를 포함한다.  입력 요소는 사용자 입력에 대응하는 적어도 하나의 입력을 포함한다.  본 발명에 따른 방법은 다수의 요소들을 포함하는 마크업 언어 문서를 생성하는 단계, 프롬프트 요소를 선택하는 단계, 그리고 사용자에게 읽혀질 프롬프트 요소에서 음성 통신을 정의하는 단계를 포함한다.  상기 방법은 입력 요소를 선택하는 단계와 사용자가 입력한 데이터를 저장하기 위해 입력 변수를 정의하는 단계를 더 포함한다.
Patent KR-20010101801-A (KR)
IPC: G02B27/18
Filed: 2000-11-23
Abstract: 디스플레이 시스템은, 광 방출의 다소 상이한 피크 파장을 갖는 적어도 2개의 LED 소스로 구성되는 광 소스를 구비한다. 개별적인 LED 소스는, 크기면에서 거의 증가하지 않거나 전혀 증가하지 않는 증가된 루멘 출력을 구비하는 단일 빔으로 조합된다. 상이한 소스의 그러한 조합된 소스(예컨대, 적색, 녹색 및 청색)는, 예를 들어 소형의 광 변조기 패널의 사용으로부터 발생하는, 한정된 범위를 갖는 디스플레이 시스템에서의 광 엔진으로 유용하다.
Patent KR-20010106530-A (KR)
IPC: B24B1/00
Filed: 2000-12-22
Abstract: 웨이퍼 주변부 가공능력의 면내분포를 측정하기 위하여 이용되는 웨이퍼 외주부의 가공능력을 평가할때, 웨이퍼 표층의 가공방향으로 경계가 되는 기준위치를 가지고 있는 웨이퍼 외주부의 가공능력 평가용 웨이퍼를 이용하여, 외주부 각 부위의 가공량을 실제 측정하여 외주부의 가공능력의 면내분포를 파악·평가한다.
Patent KR-20010104360-A (KR)
Title: 전자 릴레이
IPC: H01H50/24
Filed: 2000-03-02
Abstract: 스풀(2)의 한쪽 플랜지(2b)가 케이스 개구부의 내측에 배치되며, 이 스풀(2)에 고정단자(11)가 부착되는 전자 릴레이에 있어서, 고정단자(11)의 부착에 의해 발생하는 불순물의 문제를 해소하고, 고정단자(특히, 고정접점(10)이 마련된 부분)의 양호한 부착 상태를 실현한다. 그것을 위해 플랜지(2b)에 형성된 관통구멍(2e, 2f)에 고정단자(10)로부터 신장되는 돌출부(11e, 11f)를 압입하고, 다른 쪽의 플랜지(2a)에 형성된 걸어 맞춤부(2f)에 고정단자(11)의 고정 접점 부근을 결합함으로써 고정단자(11)를 부착하는 구조를 이루고 있다.
Patent KR-20010109324-A (KR)
Title: 기록 가능한 메모리 셀을 갖춘 집적 메모리의 작동 방법및 상응하는 집적 메모리
IPC: G11C29/52
Filed: 2000-03-02
Abstract: 본 발명은, 기록 가능한 메모리 셀을 갖춘 집적 메모리의 작동 방법 및 상응하는 집적 메모리에 관한 것이다.  메모리 셀(MC)에 대한 기록 액세스 및/또는 판독 액세스 전에 안전 메모리 셀(SC)에 저장된 안전 정보가 판독 출력된다.  판독 출력된 상기 안전 정보가 제 1 논리 상태(0)를 가지면, 에러 신호(E)가 발생된다.  판독 출력된 안전 정보가 제 2 논리 상태(1)를 가지면, 메모리 셀(MC)에 대한 액세스가 실행되고, 안전 메모리 셀(SC)에 대해서는 기록 액세스가 이루어지며, 상기 기록 액세스시에는 제 2 논리 상태(1)를 갖는 저장될 새로운 안전 정보가 상기 안전 메모리 셀에 제공된다.
Patent KR-20010110763-A (KR)
Title: 플라즈마 처리장치
IPC: H05H1/46
Filed: 2000-04-14
Abstract: 플라즈마 처리장치에 있어서, 피처리 기판(W)의 온도 제어가 개선된다.  대략 원통 형상을 가지고 세라믹 재료로 이루어지는 지지부재(26)가 처리실(10)에 설치된다.  지지부재(26)의 상단부는 재치대(24)의 이면(24b)에 고체상태 접합에 의해 밀폐되어 접합된다.  지지부재(26)의 하단부는 하부 냉각 재킷(jacket)(90) 및 Ｏ링(92, 96)을 개재하여 처리실(10)의 저부(10b)에 밀폐되어 접속된다.  지지부재(26)의 안쪽에 형성된 대기실(38)에, 원판형의 알루미늄 블록에 의해 형성된 냉각 재킷(40)이 설치된다.  냉각 재킷(40)은 열전도성 시트(sheet)부재(42)를 개재하여 재치대(24)의 이면(24a)에 부착된다.
Patent KR-20020001839-A (KR)
Title: 웨이퍼 외주 챔퍼부의 연마방법 및 연마장치
IPC: B24B51/00
Filed: 2001-02-21
Abstract: 연마제를 공급하는 동안에 연마포로 웨이퍼의 외주 챔퍼부를 연마하는 연마방법에서, 연마시간을 감소시킴으로써 공정의 생산성을 향상시키기 위해, 적어도 2 단계의 연마공정을 순차적으로 실시하였다. 상기 방법은 웨이퍼의 외주 챔퍼부의 특정부위(예를 들면, 웨이퍼 외주부의 {110}면에 상당하는 부위)를 연마하는 제1 연마공정과, 연마포의 경도 및(또는) 연마제의 입자크기를 변경함으로써 웨이퍼의  외주 챔퍼부 전체를 경면처리하도록 연마하는 제2 연마공정단계를 포함한다. 예를 들어, 상기 제2 연마공정에 사용되는 상기 연마포의 경도는 상기 제1 연마공정에서 보다 약한 것으로 하거나, 상기 제2 연마공정에서 사용되는 연마제의 입자크기는 상기 제1 연마공정에서 보다 미세한 것으로 함으로써 연마포의 경도 및(또는) 연마제의 입자크기를 변경할 수 있다.
Patent KR-20020013867-A (KR)
Title: 차량 및 에어백 도난 방지 장치
IPC: B60R25/02
Filed: 2000-05-04
Abstract: 도난 방지 장치(1)는 차량과 운전자측 에어백의 도난 방지를 위해 제공된다.  이 장치는 에어백(11)과 운전대(10)의 적어도 일부를 덮는 실드(3)와, 확장 가능한 래칫형 운전대 자물쇠(19)를 포함한다.  도난 방지 장치는 에어백을 수용하기 위한 오목한 영역과, 이 장치를 운전대(9)에 고정시키기 위한 한 쌍의 후크(15, 16)를 포함한다.
Patent KR-20020012232-A (KR)
Title: Printed media binder
IPC: B41J13/00
Filed: 2000-05-24
Abstract: A system is provided having a sensing device for sensing coded data printed on a print media surface which is installed with a secret key and a first identifier which uniquely identifies the sensing device, a printer installed with a second identifier which uniquely identifies the printer, and a server installed with the first and second identifiers. The printer obtains the first identifier from the sensing device and communicates the first and second identifiers to the server. The server determines from the received first and second identifiers whether the sensing device should be registered with the printer and if so, authenticates the sensing device by verifying an encryption from the sensing device, using the secret key, of a challenge message. Upon successful authentication, the sensing device is registered in the server so as to be associated with the printer.
Patent KR-20020019066-A (KR)
Title: Anisometrically shaped carbon and/or graphite particles, liquid suspensions and films thereof and light valves comprising same
IPC: G02F1/17
Filed: 2000-06-06
Abstract: The invention contemplates anisometrically shaped carbon-containing particles for use as the particles of a liquid light valve suspension, films and light valves. The anisometric carbon-containing particles are crystalline or amorphous particles and can have various geometrical shapes including, for example, fibrils. The above object is achieved by carefully controlling the size and shape of such particles.
Patent KR-20020009637-A (KR)
IPC: H04B7/005
Filed: 2000-05-16
Abstract: 무선 시스템에서, 전송전력은 수신기(1;2)에 의해 제어되는데, 수신기는 전송기(2;1)로부터의 신호를 평가하여 이러한 평가에 따라 전력조정정보(TPC)를 결정하고 이를 연속적인 타임슬롯들(4) 기간동안 전송기로 전송하여 전송 전력을 제어한다.  소위 슬롯모드에서, 정보가 채워지지 않은 섹션(9)을 뒤따르는 다수의 연속적인 타임슬롯들(4)에서 동일한 전력조정정보(TPC)가 전송기로 전송된다.
Patent KR-20020057807-A (KR)
IPC: G03F7/22
Filed: 2001-04-24
Abstract: 광학 시스템 내에서 수차의 능동 보정은 거울에 제1 및 제2 가압 막대를 부착하는 것을 포함한다.  제1 가압 막대는 그 종방향 중심점 근처에 개구를 갖도록 분기된다.  이 개구는 제1 및 제2 대향면을 한정한다.  제2 가압 막대는 제1 가압 막대에 대해 대체로 직각이며, 제2 가압 막대의 중심부가 제1 가압 막대의 개구 내에 배치되도록 제1 가압 막대의 개구를 통해 연장된다.  제2 가압 막대는 적어도 하나의 액츄에이터에 의해 제1 면에 접속된다.  액츄에이터의 종방향 이동은 거울의 변위를 일으킨다.  가압 막대 및 액츄에이터의 무게를 지지하도록 하기 위해 지지 구조체가 사용된다.  가압 막대는 다수의 굴곡부에 의해 지지 구조체에 접속된다.  제어 모듈은 감지 모듈로부터 정보를 수용하고 액츄에이터를 제어한다.  다른 실시예들은 두 개 이상의 가압 막대를 이용하여 광학 시스템 내에서 임의의 수차를 보다 완전하게 보정할 수 있게 한다.
Patent KR-20020015362-A (KR)
IPC: H04N9/804
Filed: 2000-06-16
Abstract: 표준 신호에 비해 수직 동기 신호의 길이에 일정한 차가 있는 경우, 셔플링 메모리로의 기입과 판독이 비동기이기 때문에, 데이터 덧씌우기나 혼합이 발생한다.  그래서, 셔플링 메모리로서 3프레임분의 메모리를 사용함으로써, 데이터가 혼합되지 않고 셔플링 처리를 행할 수 있다.
Patent KR-20030059728-A (KR)
Inventor: KIM JAI YOON
IPC: B60P3/025
Filed: 2002-01-04
Abstract: PURPOSE: A vehicle capable of showing a movie is provided to uplift the cultural level and obtain effectiveness of advertising by having access to the movies irrespective of a place. CONSTITUTION: A vehicle capable of showing a movie comprises an image system(20) installed to a ceiling panel; a screen device(50) comprising a housing(52) fixed to the ceiling panel of a front panel(10) side, and a screen(54) wound inside the housing, to be vertically withdrawn; a place for viewing(60) comprising stepped parts(62) formed in a stepped shape in the longitudinal direction of a floor panel(14), and plural seats(64) installed to the stepped parts; and an entrance and exit unit installed to the lower part of a gate of a rear panel(18). In the image system, the angle is controlled through an angle control device and the image system irradiates various image records with light. The image records of the image system are irradiated on the screen. Passengers go in and out through the gate.
Patent KR-20020090098-A (KR)
Inventor: KAKEGAWA TETSU
IPC: G06Q20/40
Filed: 2002-01-05
Abstract: PURPOSE: To provide a settlement mediating system, capable of smoothly performing credit processings among a merchandise buyer and a seller, price charging to the buyer, payment processing to the seller or the like. CONSTITUTION: If order information is received from a buyer system, the order information and a request for credit processing start are transmitted to the buyer system, and credit processing is carried out, after obtaining confirmation from the buyer. Shipment schedule information, including transportation baggage identification information, such as a scheduled shipment data and an invoice number, is received from the buyer system, and the information is mode to be associated with order reception information and stored as transaction information. Transaction information of newly assembled baggage is extracted by periodically collating the transaction information with baggage tracing information, and charging processing and payment processing are automatically made to proceed.
Patent KR-20020060586-A (KR)
Inventor: MIYAZAKI TAKUMI
IPC: F16K31/04
Filed: 2002-01-07
Abstract: PURPOSE: To provide a spring return type valve device improved in efficiency of assembling a valve, a spring unit and an actuator, and reduced in influence of heat from the valve of the spring unit. CONSTITUTION: This spring return type operating device is provided with a valve 2 for controlling a fluid flow by changing the opening of a fluid passage by the rotating operation of a valve shaft 22, an actuator 4 having an output shaft 42 rotated by an electric motor, a spring unit 3 having a rotating shaft 32 for receiving turning force from the output shaft 42 at one end and transmitting the turning force to the valve shaft 22 at the other end, and a spring for applying the turning force in one direction to the rotating shaft 32, and a yoke 5 for removably supporting the actuator 4, the spring unit 3 and the valve 2 to have a designated positional relationship.
Patent KR-20030060699-A (KR)
Title: Liquid crystal display and fabricating method thereof
Inventor: CHOI BANG SIL
IPC: G02F1/1335
Filed: 2002-01-11
Abstract: PURPOSE: A liquid crystal display and a method for manufacturing the same are provided to prevent forming of black matrix from increasing by efficiently cutting off light at light cut-off areas, thereby improving a contrast ratio. CONSTITUTION: A first insulating substrate(100) has a plurality of pixel areas(P1,P2,P3) arranged in matrix shape. The plurality of pixel areas are formed by crossing a plurality of gate lines(110) and a plurality of data lines(130). A second insulating substrate(200) faces the lower substrate. A plurality of red, green, and blue color filters(R,G,B) are formed on the insulating substrate and piled on the pixel areas respectively. Light cut-off areas are formed on the insulating substrate, and piled on the plurality of gate lines and the plurality of data lines. Red, green, and blue color resins are accumulated on the light cut-off areas. An overcoat layer covers the red, green, and blue color filters and the light cut-off areas. A common electrode is formed on the overcoat layer.
Patent KR-20030062498-A (KR)
Title: Fermentation apparatus of cattle's night soil
Inventor: KIM TAEK YEOL
IPC: C02F11/02
Filed: 2002-01-17
Abstract: PURPOSE: Provided is a livestock excrement fermentation apparatus having a mixing device and an air supply structure therein to expedite fermentation of livestock excrement. CONSTITUTION: The apparatus comprises a supply conveyer(50) having an outlet(53) at an upper portion thereof, a transfer screw(54) rotating by a motor (M), and a lower end placed in a livestock excrement supply tank(80) for upwardly transferring livestock excrement from the supply tank(80); a main body(10) having a livestock excrement inlet pipe(11) located at an upper portion thereof and near the outlet(53) of the supply conveyer(50), a livestock excrement outlet(14) formed at a lower portion thereof, the lower portion being inwardly sloped down, and a plurality of penetrating holes formed at inner surface of the lower portion of the main body(10); a driving unit(20) installed in the main body(10) and comprised of a driving motor(21), an attenuator(22), a vertical rotating shaft(23), and a screw(24) installed at the surface of the vertical rotating shaft(23); an air supply unit(30) for supplying air into inside of the main body(10); a door(70) coupled to the livestock excrement outlet(14) of the main body(10) for controlling discharging of the livestock excrement; and a conveyer(60) for transferring the livestock excrement discharged from the main body(10).
Patent KR-20020066384-A (KR)
Title: Light emitting device
Inventor: SEO SATOSHI
IPC: H01L51/30
Filed: 2002-02-07
Abstract: PURPOSE: A light emitting device is provided to increase carrier mobility by eliminating organic interfaces existing within an organic compound film, while lowering a driver voltage and lengthening an element lifetime. CONSTITUTION: A light emitting device includes an organic light emitting element which has an anode(402), a cathode(404), and an organic compound film containing a hole transporting material and an electron transporting material. The organic compound film has a structure which includes in a direction from the anode to the cathode, a hole transporting region(405) made from the hole transporting material, a first concentration change region(406) in which the proportion of the electron transporting material increases gradually until a ratio between the hole transporting material and the electron transporting material becomes x:y(wherein, x and y are positive constants), a mixture region(407) containing the hole transporting material and the electron transporting material at the ratio of x: y, a second concentration change region(408) in which the proportion of the electron transporting material gradually increases from the x:y ratio, and an electron transporting region(409) made from the electron transporting material. A light emitting region, into which a light emitting material(410) for performing light emission is added, is formed within the mixture region.
Patent KR-20020067625-A (KR)
Inventor: GARCERAN JULIO ANTONIO
IPC: H03C1/00
Filed: 2002-02-07
Abstract: PURPOSE: A digital transmitter system and a method therefor are provided to convert a digital signal into analog signal using a DAC(Digital to Analog Converter), and uses an analog signal image produced from the DAC to provide an analog signal at a transmission frequency or uses a projected analog signal image to produce analog signals for transmission. CONSTITUTION: If an SPU(Signal Processing Unit)(42a-42i) receives a digital signal comprising a plurality of digital signals, the digital signals are added together. Each SPU(42a-42i) encodes the digital signals, adds error correction information to the digital signals, performs bit interleaving, performs I(In-phase) and Q(Quadrature) modulation on the digital signals, and performs digital frequency conversion up or down to produce a digital IF(Intermediate Frequency) signal. If the position of the digital signals within the conversion bandwidth needs to be adjusted, a digital frequency converter, for example using an NCO(Numerically Controlled Oscillator) and digital mixer for frequency spectrum positioning, tunes baseband digital signals or the digital IF signal for the proper positioning of the digital signals within the conversion bandwidth for the DAC(22) such that the resulting analog image falls within the desired frequency band at the output of the DAC(22).
Patent KR-20020066197-A (KR)
Inventor: FUJIKAWA HIDEFUMI
IPC: B07B1/20
Filed: 2002-02-07
Abstract: PURPOSE: To provide a miniaturized polished-rice processing unit. CONSTITUTION: In the polished-rice processing unit 1 provided with a polished- rice processing section 2 having a wet processing part 4, a heat-adhesion material processing part 5 and a separating/drying part 6, and a particle material reproducing section 3 having a particle material adjusting part 45 selecting a specified particle sized-particle material by peeling off bran adsorbed to a particle material separated in the separating/drying part 6, a drying part 46 drying by hot air the particle material fed from the particle material adjusting part 45, and a conveying part 47 returning the dried particle material to the heat-adhesion material processing part 5, the particle material adjusting part 45 is provided with specified screen-mesh-width selection cylinders 38, 39 selecting the particle material of the specified particle size and a peeling roll 34 removing the bran stuck to the particle material fed into the selection cylinders 38, 39 by rotating the particle material therein.
Patent KR-20030069393-A (KR)
Title: Hydroquinone derivatives grafted with tat peptide, its preparation method and cosmetic composition for skin whitening comprising the same
Inventor: CHO HWAN IL
IPC: A61K47/48
Filed: 2002-02-20
Abstract: PURPOSE: Hydroquinone derivatives grafted with Tat peptide, a preparation method thereof and a cosmetic composition comprising the same for skin whitening are provided, which hydroquinone derivatives have higher stability to pH, oxygen and light and improved skin-penetrating ability. CONSTITUTION: Hydroquinone derivatives grafted with Tat peptide represented by the formula 1 are provided, wherein £ |Tat is cell-penetrable Tat peptide; R1 is selected from the group consisting of glutamine, lysine, arginine and glycine; and n is an integer of 4 to 12; and the cell-penetrable Tat peptide is selected from the group consisting of RKKRRQRRR, KKKKKKKKK and RRRRRRRRR. A method for preparing the hydroquinone derivatives of the formula 1 comprises the steps of: treating the C-terminal of the cell-penetrable Tat peptide with halogenide in a solvent in the presence of catalyst and a condensing agent; and ester reacting the halogenide treated cell-penetrable Tat peptide with hydroquinone or derivatives thereof.