baber/WOPTO huggingface dataset:
Patent KR-20090004072-A (KR)
Title: The manufacturing method and the product of the taldeware and the panel for buildig
Inventor: CHOE JONG SU
IPC: C04B24/24
Filed: 2007-07-06
Abstract: A manufacturing method of interior and exterior materials for construction and tableware is provided to heighten the reusability of resources, to have excellent strength by pressing a main material with a pressure press with a built-in heater, and to use as interior and exterior materials for construction and tableware by weighing light. A manufacturing method of interior and exterior materials for construction and tableware comprises the steps of pulverizing 80% loess which is a main material using a pulverizer, putting the pulverized 80% loess in a mixer and adding 20% melamine, and then mixing, spreading cotton fabrics treated with chemicals on the bottom of a mold having the appointed shape, putting a mixture in the mold spread with the cotton fabrics and spreading the cotton fabrics treated with chemicals on the surface of the mixture, compression-molding the cotton fabrics spread on the surface of the mixture at 160°C-180°C for 5 minutes using a pressure press with a built-in heater, and applying a paint on the surface of a base of a molding, thereby forming a coating layer.
Patent KR-20080024961-A (KR)
Title: Soundproof structure
Inventor: WAKO HIROSHI
IPC: F16H57/02
Filed: 2007-07-11
Abstract: A soundproof structure is provided to enhance a soundproof effect by reinforcing a case and easily forming a plurality of square bodies. A soundproof structure includes ribs(35), a case(30), and a cover member(36). The ribs are projected on an inner surface of the case of a power source or a power transmitter and form one or a plurality of square bodies. The cover member covers an opening facing an inside of the case and forms a space inside the one or the square bodies. The space inside the one or the square bodies and an inner space of the case are connected by holes(36a) formed at the cover member.
Patent KR-20090011747-A (KR)
Title: Method and apparatus for transferring wafer
Inventor: LEE CHONG WHAN
IPC: H01L21/68
Filed: 2007-07-27
Abstract: A method and an apparatus for transferring a wafer are provided to improve a rate of operation by carrying out wafers whose process is completed. A wafer is taken in as many as the predetermined number once(S10). Manufacturing processes for each wafer are performed(S20). Wafers whose processes are completed are temporarily stored in one place(S50). All stored wafers are transferred to the storage place once when the taken-in wafers are temporarily stored in one place(S60,S70).
Patent KR-20090012429-A (KR)
Title: Ejecting coating method and apparatus of cylinder block bore
Inventor: JEONG TAE HO
IPC: C23C24/02
Filed: 2007-07-30
Abstract: A spray coating method of cylinder block bore and a device for the same are provided to uniformly transmit heat as coating powder is coated with the state that is similar to the property of cylinder block bore. A spray coating device of cylinder block bore comprises: a pressurizer(110) providing compressed gas; a controller(120) connected to the pressurizer in order to control pressure of the compressed gas supplied by the pressurizer; a nozzle unit(130) connected to the controller in order to emit the compressed gas through the controller; and a powder supplier(100) connected to the nozzle unit in order to supply the coating powder with the compressed gas.
Patent KR-20090012898-A (KR)
Title: Motor
Inventor: PARK SANG HOON
IPC: H02K5/00
Filed: 2007-07-31
Abstract: A motor capable of reducing production cost is provided to improve quality of a motor by coupling an overload circuit breaker with winding part. A stator winding part receives a power source. An overload circuit breaker blocks an overload power source supplied in the stator winding part. An overload circuit breaker coupling part(181) is fixed in a surface of the stator winding part, and couples the overload circuit breaker. A yarn guide groove(183) is formed in an outer surface of a fixing bracket(180), and has linear shape. A yarn is loaded in the yarn guide groove, and winds the stator winding part. A loading part(182) and the yarn guide groove are formed in the overload circuit breaker coupling part. A pin insertion part(182a) is formed in the loading part in order to insert a contact pin.
Patent KR-20090016206-A (KR)
Title: Nonvolatile memory device using variable resistive element and driving method thereof
Inventor: CHO BEAK HYUNG
IPC: G11C16/00
Filed: 2007-08-10
Abstract: A non-volatile memory device using a register and a driving method of the same are provided to reduce the number of unnecessary write operations by performing a write operation after determining whether data stored in a phase change resistance cell coincides with data to be written. A memory cell array(10) includes a matrix of non-volatile memory cells. A plurality of word lines(WL0-WLm) are coupled with rows of the non-volatile memory cells. A plurality of local bit lines(LBL0-LBL3) are coupled with columns of the non-volatile memory cells within the memory cell array. A first bit line selection block(20) includes a plurality of first bit line selection circuits(Y_PASS0_T-Y_PASS3_T) coupled with the local bit lines. A second bit line selection block(30) includes a plurality of second bit line selection circuits(Y_PASS0_B-Y_PASS3_B) coupled with the local bit lines. The first and second bit line selection circuits coupled with the local bit line selected from the local bit lines during a first period are operated to connect electrically the selected local bit line with a global bit line(GBL).
Patent KR-20090017337-A (KR)
Title: Liquid crystal display device
Inventor: KIM IN JUE
IPC: G02F1/1333
Filed: 2007-08-14
Abstract: A liquid crystal display device is provided to discharge the heat to the outside by forming a lower cover with a heat conductive layer in a cold rolled sheet. A liquid crystal display device includes a liquid crystal panel(110), a lamp(143), and a lower cover(150). The lamp provides the light to the liquid crystal panel. The lower cover discharges the heat from the lamp to the outside by forming a heat conductive layer in one surface of the upper or lower surface of a cold rolled sheet(150b).
Patent KR-20070114246-A (KR)
Title: The structure for closs
Inventor: PARK NAM HYEOUNG
IPC: A47G33/02
Filed: 2007-08-17
Abstract: A cross structure is provided to emit various lights and to make the exterior thereof beautiful by coupling a lighting plate formed by combining LED lamps to a placement portion of a frame body. A cross frame body(10) is made of a metal. A placement portion(11) in which a lighting plate(20) is placed is formed on the inner side of the frame body. LED lamps(21) are connected by electrical combination to have a predetermined arranging structure on the lighting plate. A connection pin(22) and a connection jack(23) are formed on the side of the lighting plate. The lighting plates are electrically connected to each other via the connection pins and the connection jacks. A silicone material is applied to the surface of the lighting plate on which the LED lamps are combined.
Patent KR-20090020816-A (KR)
Title: Electrically-powered actuator for door lock device
Inventor: LEE MYUNG HYUN
IPC: E05B47/00
Filed: 2007-08-24
Abstract: An electric-powered actuator for a door locking device is provided to maintain unlocking condition of a latch gear arresting a striker due to the drive of one motor and minimize the structure by applying one way clutch structure. An electric-powered actuator for a door locking device comprises a base plate, a latch gear, an electric motor and an operating gear. The base plate(110) in which opening is formed is formed. The latch gear(120) is flexibly shaft-installed in the base plate. The electric motor(10) locks the latch gear by changing the latch gear to a forward direction and physically changes a pawl so that the binding of the latch gear is canceled by the pawl and produces forward reverse torque. The operating gear is shaft-installed and operates with the electric motor.
Patent KR-20070098968-A (KR)
Title: Temporary resources pipe having reinforcement form
Inventor: JUNG JIN EUN
IPC: E04C3/00
Filed: 2007-08-29
Abstract: A temporary pipe having a reinforcement form is provided to perform a joining operation with respect to a pipe with a higher coupling force to more stably and solidly construct a structure. A temporary pipe includes a plurality of reinforcement protrusions(11) and reinforcement grooves(12) that are alternately formed in a radial direction. The reinforcement protrusion(11) has a sectional surface of a round shape or in a polygon shape. The reinforcement groove is the same shape as that of the reinforcement protrusion(11). The number of the reinforcement protrusions(11) is a multiple of eight. The end of the reinforcement protrusion(11) and the end of the reinforcement groove(12) have a thickness between 4mm and 8mm.
Patent KR-20090026376-A (KR)
Title: Apparatus and method for discriminating and recognizing living-body fingerprint
Inventor: SHIN YO SHIK
IPC: A61B5/117
Filed: 2007-09-10
Abstract: An apparatus for recognizing a fingerprint by distinguishing a bio-fingerprint and a method therefor are provided to discriminate the bio-fingerprint and a forged fingerprint by sensing the change in the capacitance between a transparent electrode and the ground through a fingerprint on a fingerprint input window where the transparent electrode is formed. A fingerprint input unit(110) comprises a fingerprint sensor to obtain the image of a fingerprint contacted on a fingerprint input window of the fingerprint sensor, and then output the fingerprint image to a fingerprint authentication unit(150). At least one transparent electrode(120) is installed in the fingerprint input window of the fingerprint input unit. A living body recognizing unit(130) detects the change of capacitance by a fingerprint contacted on the transparent electrode to determine whether the contacted fingerprint is a bio-fingerprint or forged fingerprint.
Patent KR-20090074843-A (KR)
Title: Boiler used corbon fiber heaters
Inventor: OH YOUNG HAN
IPC: F24H1/20
Filed: 2007-09-21
Abstract: A boiler using carbon fiber heaters is provided to heat water quickly with a heater manufactured by cutting width and length of carbon fiber conforming to its capacity. A boiler using carbon fiber heaters includes a molten bath(3) where a hot water delivery pipe(1) and a cold water inlet pipe(2) are equipped. The molten metal has a plurality of mounting holes(5). A carbon fiber heater is installed in the mounting holes.
Patent KR-20090032595-A (KR)
Title: Method of manufacturing sludge specimen for measuring thickness of sludge, and method of mesuring thickness of sludge using the sludge specimen
Inventor: JUNG YONG CHAN
IPC: G01B7/06
Filed: 2007-09-28
Abstract: A fabrication method of sludge sample for measuring the sludge thickness and a method for measuring the sludge thickness are provided to decide the sludge cleaning period and to evaluate the cleaning effect accurately. A fabrication method of sludge sample for measuring the sludge thickness comprises following steps: a step(S1) which prepares for a magnetic material sludge composition and for a binder sludge composition; a step(S3) which mixes the magnetic material sludge composition and the binder sludge composition; a step(S5) which coats a heat pipe in the mixed sludge composition; and a step(S6) which dries the coated sludge composition.
Patent KR-20090035853-A (KR)
Title: Sustaining device of a portable display device
Inventor: SEO DONG MIN
IPC: G06F1/16
Filed: 2007-10-08
Abstract: A portable video device supporting apparatus for viewing an image device is provided to use a portable image device by a user while watching the image device conveniently. A first fix line(5) is prepared in one side of an image device and hangs on the user side. A second fix line(3) is prepared in the other side of the image device and hangs on the external object. The second fix line is wound in the winding device for being fixed to the image device. The supporting board is prepared in the backside surface of the imaging device and the supporting board rearwards rotates about the backside surface. A stand guide supports the contact unit of the backside surface of the supporting board and imaging device.
Patent KR-20090036993-A (KR)
Title: A cap opener
Inventor: KIM CHUN DONG
IPC: B67B7/18
Filed: 2007-10-11
Abstract: A cap opener is provided that safe using is possible by fixing a container in which content is stored on the opener even in the mobile place like vehicles, aircrafts and ships etc. A cap opener comprises an elastic member(130) inside the opener and a press unit(120) which holds the cap in order not to be separated unintentionally. Due to the elastic member, a cap(110) can be accepted in the opener in the insertion. The elastic member is formed symmetrically in relation to the press unit and is curve-cut to the inside. In addition, the elastic member is tapered to become narrower to the end which presses the cap.
Patent KR-20090037548-A (KR)
Inventor: LEE MYUNG HOON
IPC: E02B3/14
Filed: 2007-10-12
Abstract: A block for inducing the glow of a firefly and a creature is provided to improve eco-friendly effect by preventing the initial loss of vegetation material by using a roll of paper of the natural fiber material instead of general soil. A block for inducing the glow of a firefly and a creature is composed of a moving plate(100) functioning as the spawning location for the glow of a firefly and a creature and a moving channel, the natural fiber is compactly implanted, and a concrete block in which the moving plate is adhered to the front side. The moving plate has a surface compactly planted at the hemi spherical type, the bunch type, and the mixed mode of the bunch type and the hemi spherical type.
Patent KR-20090038524-A (KR)
Title: Transmission mount for car
Inventor: KIM JAE HEON
IPC: B60K17/06
Filed: 2007-10-16
Abstract: A transmission mount for vehicle is provided to reduce the displacement of the transmission mount with respect to a transmission by fastening a support bracket to a shock-absorbing member securely with a bracket support pin. A transmission mount for vehicle comprises a shock-absorbing member(110), an upper plate(120) covering the top of the shock-absorbing member, including a slot(123) in which at least part of the support bracket is inserted, a lower plate(130) covering the bottom of the shock-absorbing member, a pair of support brackets(160) combined symmetrically to the surface of the upper plate and supporting the upper plate, and a bracket support pin which is combined in the support bracket at both sides and supports the support bracket.
Patent KR-20090038995-A (KR)
Title: A method of continuous extrusion for activated carbon molding by using polymeric organic binder
Inventor: YIM JIN HEONG
IPC: B01J20/20
Filed: 2007-10-17
Abstract: A method of manufacturing an activated carbon molding by continuous extrusion using a polymeric organic binder is provided to manufacture a molded product of active carbon having excellent mechanical strength, to simplify a manufacturing process, and to improve productivity. A method of manufacturing an activated carbon molding includes a step for extruding an activated charcoal composition including ~10 weight% of an inorganic material additive, 0~5 weight% of an organic compound lubricant, 20~50 weight% of an organic polymer binder, and 50~80 weight% of activated charcoal or metal-processed activated charcoal. The activated charcoal is made of a raw material like bituminous coal, peat, lignite, petroleum cokes, sawdust, coconut husk etc. The organic polymer binder uses a polymer selected from in general-purpose polyolefin.
Patent KR-20090039059-A (KR)
Inventor: PARK CHANG HUN
IPC: B60T7/08
Filed: 2007-10-17
Abstract: A drum integrated electronic control parking brake is provided to measure accurate clamping force of the jack assembly with an infrared sensor applied to the screw jack portion and compensate abrasion of the shoe effectively. A drum integrated electronic control parking brake comprises a motor(2) which is driven by an ECU and provides the power of locking/releasing a parking brake, a drive shaft(5) rotated by a gear-box(3) converting the torque of the motor, a driven shaft(7) generating the torque converted into the direction perpendicular to the drive shaft, a jack assembly(10) which is opened and closed by the driven shaft, an infrared sensor(9) which measures the location change of the jack assembly so that the ECU calculates the clamping force of the jack assembly, and a wheel cylinder made of a shoe forced towards a drum(D) by the jack assembly.
Patent KR-20090043984-A (KR)
Title: 반도체 소자의  금속배선 제조방법
Inventor: NAM KI WON
IPC: H01L21/28
Filed: 2007-10-30
Abstract: 본 발명은 감광막패턴의 마진부족에 의해 금속배선에 탑어택이 발생하는 것을 방지 및 금속배선 간에 브릿지를 방지할 수 있는 반도체 소자의 금속배선 제조방법을 제공하기 위한 것으로, 본 발명은 도전층을 형성하는 단계; 상기 도전층 상에 다층의 폴리머층을 형성하는 단계; 상기 다층의 폴리머층 상에 접착층을 형성하는 단계; 상기 접착층 상에 감광막패턴을 형성하는 단계; 상기 감광막패턴을 이용하여 상기 접착층 및 다층의 폴리머층을 식각하는 단계; 상기 도전층을 식각하여 금속배선을 형성하는 단계를 포함하고, 도전층 상에 카본계 폴리머층, 실리콘계 폴리머층 및 접착층을 추가로 형성하여 감광막패턴의 마진을 확보함으로써 금속배선 형성시 금속배선의 탑어택 및 금속배선 간의 브릿지를 방지할 수 있는 효과가 있다. 
       
     금속배선, 폴리머, 식각마진
Patent KR-20090045552-A (KR)
Inventor: HUH SEUNG HYO
IPC: E01D19/10
Filed: 2007-11-02
Abstract: 본 발명은 다리(예를 들어, 사장교)나 건물 등에 설치된 조명시스템에 관한 것으로써, 조명기구와 이 조명기구로부터 조사되는 빛을 수광하여 반사시키는 케이블의 배치 구조를 개선하여 가장 효율적인 수광 및 반사가 행해지도록 하는 기술이다. 
       
     	다리, 조명, 케이블
Patent KR-20090046011-A (KR)
Inventor: HONG EUN SUK
IPC: A61K8/97
Filed: 2007-11-05
Abstract: 본 발명은 모링가 종자 추출물 및 폼블린을 함유하여 오염된 환경 및 자외선 등으로부터 피부를 보호하는 화장료 조성물에 관한 것으로, 상기 화장료 조성물은 중금속 및 담배연기에 대한 피부보호 효과가 우수하며, 오염 물질 및 자외선으로부터 손상받은 피부를 정화하는 능력을 갖는 모링가 종자 추출물의 효능과 피부 도포시 필름을 형성하여 유해한 물질이 피부와 접촉하는 것을 차단해주고, 자극으로 인해 손상된 피부를 회복시켜주는 폼블린의 효능으로 인하여 황사, 스모그, 담배연기, 자외선 등과 같은 외부의 유해한 요인으로부터 피부를 보호해줄 뿐만 아니라 손상된 피부의 회복에 도움을 줄 수 있는 효과가 있다. 
     모링가, 폼블린, 항오염, 피부보호, 화장료, 조성물
Patent KR-20090047883-A (KR)
Inventor: PARK MIN KYOUNG
IPC: H04B7/04
Filed: 2007-11-08
Abstract: 본 발명은 무선 단말 및 무선 단말의 신호 송수신 방법에 관한 것으로, 네트워크 동작 모드, 채널환경 및 서비스 품질 등을 고려하여 신호 송수신시 소비되는 에너지 소비를 최적화한 변조방식 및 안테나 모드를 선택하고, 선택된 변조방식 및 안테나 모드를 이용하여 신호를 송수신하기 위한 것이다. 
       
     무선 단말, MIMO(Muitiple Input Multiple Output), 에너지, 최적화
Patent KR-20090050715-A (KR)
Inventor: LEE YOUNG CHUN
IPC: F16C43/00
Filed: 2007-11-16
Abstract: 본 발명은 휠 베어링과 너클의 고정장치에 관한 것이다.  본 발명의 고정장치는 휠 베어링을 너클에 고정 및 지지하기 위한 고정장치로서, 일부에 개방부를 갖는 환형이며 탄성을 갖는 플랜지부와, 플랜지부를 따라 제공되며 플랜지부를 너클에 유지하기 위한 유지 수단과, 플랜지부를 따라 제공되며 휠 베어링의 외륜을 탄성에 의해 가압하여 일 방향 이동을 제한하는 탄성 가압수단을 포함한다.  본 발명의 고정장치는 적은 힘으로 탈착이 용이하고 재사용이 가능하다. 
       
     너클, 베어링, 고정장치, 체결링, 지그
Patent KR-20090050768-A (KR)
Inventor: KIM GANG YOUL
IPC: G10L25/93
Filed: 2007-11-16
Abstract: 본 발명은 음성 데이터를 처리하는 버퍼 제어 장치 및 방법에 관한 것이다. 
     본 발명에 제공하는 장치는, 음성 데이터를 처리하는 버퍼 제어 장치에 있어서, 음성 데이터 수신을 위한 버퍼의 초기화 단계 시에 상기 버퍼의 초기 읽기속도를 측정하여 출력하고, 실시간 처리 단계 시에 상기 버퍼의 리드 포인터(Read Point: RP)와 라이트 포인터(Write Point: WP)를 실시간으로 측정하여 출력하고 측정부와, 상기 음성 데이터의 묵음 구간 정보를 검출하여 출력하는 묵음 검출부와, 상기 초기화 단계 시 상기 출력된 초기 읽기속도를 이용하여 미리 설정된 출력속도와의 속도차이 값을 구하여 출력하고, 상기 실시간 처리 단계 시 상기 RP와 WP를 이용하여 리더-라이터(RW)값을 계산하여 출력하는 제어부와, 상기 버퍼 초기화 단계 시 상기 속도차이 값을 이용하여 상기 버퍼에 입출력될 음성 데이터량의 비율을 조정하는 초기 데이터 보상을 수행하고, 상기 실시간 처리 단계 시 상기 RW값이 변경되고 상기 현재 음성 데이터가 묵음 구간인 경우 상기 버퍼에 저장되는 음성 데이터량의 비율을 조정하는 실시간 데이터 보상을 수행하는 데이터 보상부를 포함한다.  
       
     음성 데이터, 버퍼, 데이터 보상, 인터폴레이션(interpolation), 데시메이션(decimation), 묵음 구간
Patent KR-20090053196-A (KR)
Inventor: KIM SUNG JOONG
IPC: G02F1/133
Filed: 2007-11-22
Abstract: 본 발명은 액정표시장치에서 백라이트 구동용 인버터를 버스트 구동방식으로 구동할 때 구동전류의 단속동작에 의해 사운드 노이즈가 발생되는 것을 방지하는 기술에 관한 것이다. 이러한 본 발명은 소정 주파수의 구동신호를 생성하는 구동신호 생성기와; 백라이트용 램프의 관전류검출신호와 상기 구동신호를 근거로 펄스폭변조신호를 생성하는 펄스폭변조신호 제어부와; 상기 펄스폭변조신호로 스위칭 소자를 스위칭하여 이로부터 버스트 디밍 패턴의 교류전압이 출력되게 하되, 버스트 디밍 구간 중 턴오프 구간에도 소정치의 전류가 출력되도록 하는 인버터 집적소자와; 상기 인버터 집적소자로부터 공급되는 교류전압을 승압하여 백라이트용 램프에 공급하는 트랜스포머에 의해 달성된다. 
       
     백라이트, 사운드노이즈,버스트 구동방식
Patent KR-20080048949-A (KR)
Title: Mim device and electronic apparatus
Inventor: KURAHASHI TERUO
IPC: H01L27/108
Filed: 2007-11-28
Abstract: An MIM device and an electronic apparatus are provided to reduce a manufacturing cost by using an inexpensive metal nitride layer instead of an expensive Pt layer. An MIM device includes a lower electrode(23), a hysteresis layer(24), and an upper electrode(25A,25B,25C,25D). The lower electrode is made of a metal nitride layer. The hysteresis layer is made of an oxide layer containing Nb formed on the lower electrode. The upper electrode is made of a metal nitride layer formed on the hysteresis layer. The upper and lower electrodes are made of the same material. The same material is selected from a group including MoN, TaN, WN, HfN and TiN. The oxide layer including Nb includes Nb2O5. The upper electrode is formed of a material selectively etched to a material including the hysteresis layer.
Patent KR-20090059294-A (KR)
Title: Oven
Inventor: KIM KWANG HWA
IPC: F24C13/00
Filed: 2007-12-06
Abstract: An oven is provided to keep the humidity of food during cooking by providing steam produced in the cavity wall. An oven comprises a main body including a cavity(120) in which food is cooked and a plurality of heating sources heating the food, and a steam part(200) which is located in the inner wall of the cavity where steam is produced by the heating source. The steam part includes a storage in which water for steam production is stored, and a support member(220) supporting the storage to the cavity wall.
Patent KR-20090059375-A (KR)
Title: 수동변속기의 후진변속기구
Inventor: KIM TAE HYOUNG
IPC: F16H63/30
Filed: 2007-12-06
Abstract: 본 발명은 수동변속기의 후진변속기구에 관한 것이다. 
     본 발명은 입력축과 연결되는 리버스 입력기어, 출력축과 연결되는 리버스 출력기어, 상기 리버스 입력기어와 리버스 출력기어 사이에 물림되는 리버스 아이들러 기어, 및 변속기 케이스와 클러치하우징 사이에 구비되어 상기 리버스 아이들러 기어를 회전 가능하게 지지하는 리버스 아이들러 샤프트를 포함하는 수동변속기의 후진변속기구로서, 상기 리버스 아이들러 샤프트의 양측단은 변속기 케이스와 클러치하우징의 내면에 상호 대응되게 형성되는 지지홈에 각각 회전가능하게 삽입 지지된다. 
     상기와 같이 리버스 아이들러 샤프트의 양측단을 변속기 케이스와 클러치 하우징에 각각 회전가능하게 고정함으로써 리버스 아이들러 샤프트가 편심되는 것을 미연에 방지할 수 있으며, 더불어 소음을 크게 감소시킬 수 있고, 구조를 단순화시킬 수 있어 제조비용을 크게 절감할 수 있는 효과가 있다. 
       
     수동변속기, 리버스 아이들러 샤프트
Patent KR-20090059600-A (KR)
Title: 4wd control method for coastdown test
Inventor: SHIN SEOK KEE
IPC: G01M13/00
Filed: 2007-12-07
Abstract: A 4WD control method in a coast down test is provided to reduce the loss by 4WD(Four Wheel Drive) operation and improve fuel efficiency. A 4WD control method in a coast down test comprises a step of determining whether a vehicle has maintained the neutral shift over three seconds while the travel speed exceeds 30km/h, a step of entering a coast down test mode if the vehicle has maintained the neutral shift over three seconds and controlling 4WD based on the existing TOD(Torque On Demand) if not, a step of determining whether the steering wheel is operated, a step of controlling 4WD based on the existing TOD if the steering wheel is operated and detecting a wheel speed difference between the front and rear wheels if not, a step of controlling 4WD based on the existing TOD if the detected wheel speed difference is over the initial set value and determining whether ABS and TCS are activated if the detected wheel speed difference is lower than the initial set value, and a step of controlling 4WD based on the existing TOD if the ABS and TCS are activated and suppressing the 4WD operation if not.