baber/WOPTO huggingface dataset:
Patent KR-20080031646-A (KR)
Title: Performance stability in shallow beds in pressure swing adsorption systems
Inventor: LABUDA MATTHEW JAMES
IPC: B01D53/047
Filed: 2007-10-02
Abstract: Improved pressure swing adsorption processes with performance stability in shallow beds are provided to remove impurities, particularly water, in the design and operation of small, portable, rapid cycle PSA oxygen concentrators. A pressure swing adsorption process for the production of oxygen comprises the steps of: (a) providing at least one adsorption container having a feed end and a product end, wherein the container comprises a first layer which is formed of adsorbent material adjacent to the feed end and a second layer which is formed of adsorbent material disposed between the first layer and the product end, the adsorbent material of the first layer is selective for the adsorption of water from a mixture comprising water, oxygen, and nitrogen, the adsorbent material of the second layer is selective for the adsorption of nitrogen from a mixture comprising oxygen and nitrogen, and the adsorption heat of water on the adsorbent material of the first layer is about 14 kcal/mole or less at loadings of about at least 0.05 mmol adsorbed water per gram of adsorbent material; (b) introducing a pressurized feed gas comprising at least oxygen, nitrogen, and water into the feed end of the adsorption container and passing the gas successively through the first and second layers to adsorb at least a portion of the water onto the adsorbent material of the first layer and adsorb at least a portion of the nitrogen onto the adsorbent material of the second layer, wherein the water in the first layer formed of adsorbent material is in the mass transfer coefficient range of about 125 to about 400 sec^-1, and the superficial contact time of the pressurized feed gas in the first layer is about 0.08 to about 0.50 sec; and (c) withdrawing an oxygen-enriched product gas from the product end of the adsorption container.
Patent KR-20090035175-A (KR)
Title: Method for preparing high-purified unsaturated fatty acids
Inventor: LEE BYUNG GI
IPC: C11B1/04
Filed: 2007-10-05
Abstract: A method for manufacturing a highly pure unsaturated fatty acid is provided to mass-produce the highly pure unsaturated fatty acid with a simple and efficient process by removing the saturated fatty acid from the free fatty acid. A method for manufacturing a highly pure unsaturated fatty acid comprises the steps of: (a) preparing pre-activated urea by drying the aqueous urea solution with a vacuum spray dryer; (b) injecting the free fatty acid obtained by hydrolyzing vegetable oil in a reactor; (c) injecting and mixing the pre-activated urea prepared in the (a) step in the reactor of (b) step; (d) removing the saturated fatty acid by filtering the mixture of (c) step; and (d) distilling the free fatty acid filtered in the (d) step.
Patent KR-20080031841-A (KR)
Title: A semiconductor device including multi-bit memory cells and a temperature budget sensor
Inventor: HAPP THOMAS
IPC: G11C16/34
Filed: 2007-10-05
Abstract: A semiconductor device including multi-bit memory cells and a temperature budget sensor is provided to improve data retention time, by widening temperature range for the memory device to operate. A semiconductor device(100) includes a plurality of multi-bit memory cells, a first temperature budge sensor(112a) and a circuit for regenerating the plurality of multi-bit memory cells. Each multi-bit memory cell is capable of being programmed in more than two states. The circuit compares a first signal from the first temperature budget sensor with a first reference signal in order to obtain first comparison result, and regenerates the plurality of multi-bit memory cells on the basis of the first comparison result.
Patent KR-20090038949-A (KR)
Inventor: BYUN YOUNG JUN
IPC: A01K15/02
Filed: 2007-10-17
Abstract: 본 발명은 애완견 달리기 기계로서 현재 우리가정에서 애완견을 기를 때 자유롭게 활동 할 수 있게 풀어 놓고 기를 수가 없기 때문에 항상 좁은 공간에서 갇혀 있거나 일정한 공간에서만 활동 할 수 밖에 없다. 
     그렇기 때문에 운동을 시키려고 하면은 주인과 함께 공원이나 산책로를 다니는 것이 운동의 전부이다. 그러나 사람들도 바쁘게 생활하다 보니 애완견과 달리기를 할수 있는 시간이 고작 한 달에 한 두번 밖에 되지 않는다. 따라서 애완견은 운동 부족으로 비만이 되고 병에 대한 저항력이 약해져 각종 질병에 노출된다. 
     따라서 본 발명은 애완견이 좁은 공간에서도 달리기를 할 수 있는 애완견 달리기 기계로서 사람들이 사용하는 런링머신과 모양을 달리하고 전기 모터를 사용하지 않고 물래 방아와 비숫한 모양을 만들고 바닦에 의자축과 같은 모양으로 고정시켜 놓고 전방 상단에 애완견이 좋아하는 먹이를 매달아 놓으면 애완견이 회전축 내부로 들어가서 먹이를 먹으려고 앞으로 달려가면 그 무게에 의해서 회전판이 회전을 하게하고 애완견은 계속하여 그것을 먹으려고 앞으로 달려가게 된다. 빨리 달려서 먹으려고 하면 빨리돌고 천천히 달리면 천천히 돌기 때문에 애완견은 자동적으로 속도에 알맞게 달리게 되어 운동이 되는 것이다. 
     따라서 이 기계를 이용하면 애완견의 체력증진은 물론 애완견 달리는 모습도 감상 할 수 있고 사람도 운동을 하고 싶은 동기를 부여 할 수 있는 유용한 기계라 할 수 있다.
Patent KR-20080035475-A (KR)
Title: Process and apparatus for producing sub-micron fibers, and nonwovens and articles containing same
Inventor: JOHNSON MICHAEL H
IPC: D04H13/00
Filed: 2007-10-17
Abstract: A method for manufacturing a nonwoven web, a nonwoven web product, and an apparatus and a method for preparing a sub-micron fiber are provided to produce fibers and webs having high quality and fewer defects, by fibrillating a polymer film to form the sub-micron fiber. A pressurized gas stream flows within a gas passage(4), which is confined between first and second opposing walls(5,6), of which at least one is heated. At least one polymer fluid stream(2) flows through at least one bounded polymer passage, which ends in at least one opening portion in at least one of the opposing heated walls, thereby extruding each polymer fluid stream in a film type from the opening portion. The extruded polymer film is joined to the gas stream, thereby fibrillating the polymer film. As the result, a fiber of less than diameter is discharged from an exit end of a second section of the gas passage. The gas passage includes a first upstream section(8) into which the gas enters from a supply end, a transition region(9), and a second downstream section(10) in which the gas flows to the exit end. The transition region fluidly connects the first section to the second section. The gas passage ends at the exit end of the second section. The first section of the gas passage has a cross-section decreased from the supply end to the transition region. The second section of the gas passage has a cross-section increased from the transition region to the exit end of the second section. Further, the gas stream passes through the gas passage at 150 to 3500 kg/h/m.
Patent KR-20090039113-A (KR)
Title: Semiconductor memory device
Inventor: YOU MIN YOUNG
IPC: G11C7/12
Filed: 2007-10-17
Abstract: A semiconductor memory device is provided to divide a cell region and a peripheral circuit region by controlling a bit line signal with a test signal. A test control(100) receives a bit line control signal(SHLP, SHRP), a bit line equalization control signal, and a test signal. The test control generating a bit line separation signal(SHL, SHR) and a bit line equalization signal(BLEQ) by perform logic combination of received signals. Cell array areas(140, 150) comprises an plurality of memory cells(C) arranged at the cross-region of the sub word line and respective bit line. The bit line sense AMP senses data loaded to the bit line and amplifies it, and bit line separate units(170,180) comprises the NMOS transistor(N15~N18, N19~N22).
Patent KR-20090039505-A (KR)
Title: Method of fabricating semiconductor device
Inventor: SHIN DONG SUK
IPC: H01L21/28
Filed: 2007-10-18
Abstract: A method for manufacturing a semiconductor device is provided to prevent HCI(Hot Carrier Injection) of NBTI(Negative Bias Temperature Instability) phenomenon by metal-processing an etch stop layer before forming a metal line. A transistor region is defined in a substrate(S410). A gate oxidation layer is formed on the transistor region. A gate electrode is formed on the gate oxidation layer. An etch stop layer is formed on the gate oxidation layer and the gate electrode(S440). The substrate is plasma-processed by using the non-silane based process gas including deuterium(S450). An interlayer insulating layer is formed on the etch stop layer(S460). A metal line of the lowermost level is formed on the interlayer insulating layer(S490).
Patent KR-20090042056-A (KR)
Title: Air conditioner
Inventor: JUNG CHANG WOO
IPC: F24F13/20
Filed: 2007-10-25
Abstract: An air-conditioner is provided to improve the air-conditioning performance by exposing the air and outlet ports from the side as the front panel moves forth and blocking the space between the front panel and the housing with the airflow cutoff device. An air-conditioner comprises a housing(11) having a heat exchanger installation chamber in which a heat exchanger is installed and a blower installation chamber(12) in which a blower(21) is installed, a front panel(31) opening and closing the heat exchanger installation chamber and the blower installation chamber, panel transport units(40,50) moving the front panel back and forth, and an airflow cutoff device(70) which is installed between the housing and the front panel and blocks the airflow between the blower installation chamber and the heat exchanger installation chamber. The airflow cutoff device includes a shield(71) which is unfolded when the front panel moves forth.
Patent KR-20080038068-A (KR)
Title: Device suitable for placing components on a substrate
Inventor: HORIJON JOSEPH LOUIS
IPC: H05K13/08
Filed: 2007-10-29
Abstract: A device for placing a component on a substrate is provided to implement an optical system and a prism with high accuracy, and to prevent fouling of a deflection mirror. A device(1) for placing a component on a substrate(28) includes an imaging device(6), a placement element(7), and an optical system(4). The placement element is connected to the imaging device to place the component on the substrate. The optical system has an optical axis(13). Both of the placement element and the imaging device relatively move with respect to the optical system to a position where the optical axis is placed between the imaging device and the placement element. The imaging device detects the position of the component supported by the placement element. The optical system is telecentric in an image space adjacent to the imaging device and in an object space adjacent to the placement element.
Patent KR-20090045800-A (KR)
Inventor: LEE YOUNG LEE
IPC: A62B5/00
Filed: 2007-11-02
Abstract: 본 발명은 비상피난기구에 관한 것으로, 보다 상세하게는 화재와 같은 비상시에 안전한 아래층으로 대피할 수 있어 인명피해를 줄이도록 하고, 더욱이 본 발명에 따른 비상피난기구를 베란다 등에 설치하여 비상피난기구로 피난로가 확보되도록 하여 더욱 안전하게 대비할 수 있도록 하는 안전장치가 갖춰진 비상피난기구에 관한 것이다. 
     이를 위한 본 발명은 매립케이스(10) 내부에 피난기구(20)가 설치되는 비상피난기구(A)가 구비되어지되, 상기 매립케이스(10) 상부로는 상부도어(12)가 설치되고, 상기 매립케이스(10) 하부로는 하부도어(13)가 설치되며, 상기 매립케이스(10)의 일측에는 상기 피난기구(20)의 일측이 회동가능하도록 하고, 타측에는 안전장치용 전기정(30)이 설치되며, 상기 상부도어(12)는 상기 전기정(30)과 대응되는 위치에 상기 전기정(30)의 안전체결부재(36)가 삽입 및 분리가 되는 안전체결홈(121)이 형성되며, 상기 전기정(30) 컨트롤러블럭(300)의 전기정제어부(301)는 전기정액튜에이터(31)의 작동을 제어하도록 구비되는 것을 특징으로 한다. 
       
     비상피난기구, 피난기구, 안전장치, 전기정
Patent KR-20090049723-A (KR)
Inventor: KIM YOUN KYU
IPC: G01B21/00
Filed: 2007-11-14
Abstract: 본 발명은 곡판 모서리 계측용 지그(Jig)에 관한 것으로서, 특히 계측하고자 하는 곡판 모서리 부위의 곡률형상에 대응하는 하부접촉면을 구비하고, 중앙부에 센서가 삽입될 수 있는 센서삽입구가 형성되어, 측정이 어려운 곡판 모서리 부위에서의 정밀 계측을 가능하게 하는 곡판 모서리 계측용 지그에 관한 것이다.  
     본 발명은 센서가 장착되어 곡판 모서리를 계측하기 위한 곡판 모서리 계측용 지그에 있어서, 일측 바닥면은 상기 곡판 모서리에 접한 곡면 상에 접촉되고, 타측 바닥면은 상기 곡면에 접한 인접단면 상에 접촉되도록, 중심선을 기준으로 상기 일측 바닥면과 상기 타측 바닥면이 적정 각도로 이격 형성된 지그블록부와, 상기 지그블록부에 상기 센서가 삽입 장착되도록, 상기 지그블록부의 중심선을 따라 형성된 센서삽입구 및 상기 지그블록부에 삽입 장착된 상기 센서의 센싱부가 상기 곡판 모서리에 접촉되도록, 상기 일측 바닥면과 상기 타측 바닥면 사이에 내홈 형성된 센싱내홈부를 포함하는 것을 특징으로 하는 곡판 모서리 계측용 지그를 제공한다.  
     본 발명에 따르면, 위치 계측이 어려운 곡판 모서리 부위를 작업자 또는 작업 환경과 무관하게 오차 없이 정밀 계측할 수 있으며, 특히 조선 산업에서, 곡판 형상의 선박 구조물을 IGPS를 이용하여 계측 시, 보다 높은 계측 정밀도를 얻을 수 있어, 선박 품질 향상으로 인한 선박 수주 경쟁력을 드높일 수 있는 기술적 효과가 있다.  
       
     지그(Jig), 곡판 모서리 계측, 선박 외판, IGPS, 벡터바
Patent KR-20090050199-A (KR)
Inventor: PARK PEOM
IPC: G06K9/52
Filed: 2007-11-15
Abstract: 본 발명은 사람 얼굴의 눈썹, 눈, 입과 같은 특징점들의 움직임 정보를 광류 알고리즘을 이용하여 추적하고 은닉 마르코프 모델을 이용하여 얼굴 표정은 인식하는 방법이다. 얼굴 표정 인식 시스템은 전처리 과정, 얼굴 검출, 얼굴 특징점 추적, 얼굴 표정 인식으로 구성된다. 전처리 과정에서는 실시간으로 입력된 영상에 대하여 조명의 영향을 최소화하기 위한 단계로 최대-최소 정규화 방법과 참조 화이트를 이용하여 영상을 개선한다. 개선된 영상에 대하여 얼굴 영역을 검출해야 하는데 본 시스템에서는 H-T 컬러모델을 이용하여 얼굴의 후보 영역을 검출하고, 검출된 후보 영역에 대하여 주성분분석과 템플릿 매칭을 이용하여 정확한 얼굴 영역을 검출한다. 얼굴 특징점 추적 단계에서는 얼굴의 기하학적 정보를 이용하여 눈썹, 눈, 입의 특징점들의 위치를 획득하고, 각각의 특징점들의 움직임을 광류 알고리즘을 이용하여 추적한다. 얼굴 표정 인식 단계에서는 본 시스템에서 제안한 표정 패턴 모델을 은닉 마르코프 모델에 적용하여 표정 인식을 수행한다. 
       
     얼굴, 표정, 인식, 광류, 은닉 마르코프 모델
Patent KR-20090052991-A (KR)
Inventor: SHIM JUNG SUP
IPC: C08J5/18
Filed: 2007-11-22
Abstract: 본 발명은 광학 이방성 필름에 관한 것으로, 보다 구체적으로는 고리형 올레핀계 중합체 및 방향족 포스페이트계 화합물을 포함하는 광학 이방성 필름, 이의 제조방법, 및 이를 포함하는 액정 표시 장치에 관한 것이다.  
     본 발명에 따른 광학 이방성 필름은 저비용으로 네가티브 복굴절율을 가지는 C-플레이트(negative C-plate)형의 광학 이방성 필름의 제조가 가능하며, 난연성을 부여함과 동시에 두께 방향의 굴절률의 조절이 가능하여 광학설계에 의한 위상차 조절 범위가 크므로 여러 종류의 액정 표시 장치(Liquid crystal display)용 광학 필름으로 사용할 수 있다. 
     고리형 올레핀, 방향족 포스페이트계 화합물, 네가티브 C-플레이트, 광학 이방성 필름, 액정 표시 장치
Patent KR-20090056118-A (KR)
Title: Paper with idex functionality and record media comprising the same
Inventor: SUN RAN
IPC: B42F21/12
Filed: 2007-11-30
Abstract: Paper having index property and a recording medium including the same are provided to offer convenient usability by recognizing indication easily and minimizing deformation of the paper. Paper(100) includes a cut portion(110) divided by cutting lines(112,114,116). The cut portion is divided to an outer side of the paper. The cutting line is formed into broken lines. The cut portion is protruded selectively to the outer side of the paper. The cut portion is formed 1 or more parts. The cut portion has a different color in other regions of the paper.
Patent KR-20090056328-A (KR)
Title: System and method for detecting abnormal mask pattern in mask pattern data used for manufacturing photomask
Inventor: LEE HYE SUNG
IPC: H01L21/027
Filed: 2007-11-30
Abstract: A system and a method for detecting an abnormal mask pattern in a mask pattern data used for manufacturing a photomask are provided to improve the increase of time and costs for converting large size data by reuse mask pattern data having a defect. Circuit design data is input and it is transformed from mask pattern data to mask pattern data. The mask pattern is corrected by verifying the defect of a mask pattern data using the circuit design data, and an abnormal mask pattern is detected to the corrected mask pattern data. The abnormal error mark is generated in the abnormal mask pattern and it is stored. If the abnormal mask pattern is not in the corrected mask pattern data, the photomask pattern is generated.
Patent KR-20080051076-A (KR)
Title: Ferroelectric memory device and electronic equipment
Inventor: KOIDE YASUNORI
IPC: G11C11/15
Filed: 2007-12-03
Abstract: A ferroelectric memory device and an electronic equipment are provided to improve read margin as preventing judgment error, by increasing a potential of one of a first and a second node. A first charge transfer MISFET(T2-L) is connected between a first bit line and a first node(Vmn-L). A second charge transfer MISFET(T2-R) is connected between a second bit line and a second node(Vmn-R). A first capacitor is connected to the first node. A second capacitor is connected to the second node. A first p-channel MISFET(P1-L) is connected between the first charge transfer MISFET and the first node, and has a gate electrode connected to the second node. A second p-channel MISFET(P1-R) is connected between the second charge transfer MISFET and the second node, and has a gate electrode connected to the first node.
Patent KR-20090005943-A (KR)
Title: System and method for low-delay video telecommunication
Inventor: JIN EN JI
IPC: H04N19/142
Filed: 2007-12-03
Abstract: A low-delay image communication system and a method thereof are provided to solve transmission delay in a transmission channel and transmission delay caused by buffering. A coding unit(110) successively codes input video data of a current frame of an inter mode. The current frame is divided into N block groups. Based on video data to a k(1<=k<=N-1)-numbered block group in which the coding is performed in the code unit, a scene change decision device(112) determines whether the current frame is corresponded to a scene change frame. If so, the coding unit perform no coding process for an image belonging to N-numbered block group from (k+1)-number block group.
Patent KR-20090058247-A (KR)
Title: Hood latch assembly for preventing robbery
Inventor: PARK HYEON JUNG
IPC: E05B83/24
Filed: 2007-12-04
Abstract: An anti-theft hood latch assembly for the burglar alarm is provided to prevent the part robbery of the engine room by preventing the opening of the hood of car by the secession of the release cable. An anti-theft hood latch assembly for the burglar alarm comprises the latch base(200) in which the locking groove is formed; a front end module(100) in which the latch base is mounted; the hood latch pivotally installed at the latch base; the release cable(300) operating the hood latch; the guide groove(240) which is formed in the latch base and assembles the release cable; and the fastening protrusion(110) extended to the guide groove. The fastening protrusion is formed in front and module, and from the release cable being broken away from to the lateral direction.
Patent KR-20080084551-A (KR)
Title: Method of producing photosensitive resin film, transfer material, substrate with pixel separation wall, color filter and production method thereof, and display device
Inventor: TAKEDA AKIHIKO
IPC: G03F7/004
Filed: 2007-12-05
Abstract: A method for forming a photosensitive resin film is provided to reduce a variation in thickness of a photosensitive resin film before forming a patterned image, such as barrier ribs for pixels, and to realize improved water repellency and ink repellency of a photosensitive resin film. A method for forming a photosensitive resin film comprises the steps of: providing a photosensitive resin composition by adding an ink-repellent, wherein the ink-repellent causes a difference in surface energies of at least 2 mN/m before and after adding the same; and applying the photosensitive resin composition onto a substrate or provisional substrate, followed by vacuum drying, to form a photosensitive resin film.
Patent KR-20090059408-A (KR)
Title: Mobile communication terminal and method for providing function of dive computer
Inventor: LEE JUN WOO
IPC: G06F15/02
Filed: 2007-12-06
Abstract: A mobile communication terminal for offering a dive computer function and a method thereof are provided to measure, calculate and offer information considered in diving by driving a dive mode on the mobile terminal. A decompression model providing server(300) stores a plurality of decompression model algorithms. If a signal of selecting a specific decompression model algorithm is received, the decompression model providing server extracts a corresponding decompression model algorithm from the plural decompression model algorithms. A mobile communication terminal(100) measures the water depth by comprising a water depth measurement server(200), and generates a dive condition by applying a diving condition set by a user, water depth measurement information and time information to the decompression model algorithm.
Patent KR-20090061172-A (KR)
Inventor: MOON OH HYUNG
IPC: F21V33/00
Filed: 2007-12-11
Abstract: A lighting device is provided to improve convenience of use by simply controlling operation and pause of an insect exterminating unit through a power control unit. A lighting device includes a fixing main body(10), a reflective cover(20), an insect exterminating unit(30), a power control unit(40), and a mounting unit(50). The fixing main body has a stabilizer(11), a socket(12), and a lamp(13). The reflective cover is detachably installed in a bottom part of the fixing main body. The insect exterminating unit is mounted on a bottom surface of the fixing main body by the mounting unit. Through holes(14,14') are formed in the fixing main body. The power control unit is mounted on a side of the fixing main body. The power control unit is connected to the insect exterminating unit. The insect exterminating unit is an ultrasonic generation device.
Patent KR-20090065208-A (KR)
Title: Method for setting write strategy parameter in disc drive, and recording and reproducing apparatus thereof
Inventor: HWANG WOOK YEON
IPC: G11B7/125
Filed: 2007-12-17
Abstract: A method for setting write strategy parameter in a disc drive and a recording and reproducing apparatus thereof are provided to set up optimum write strategy parameter to a disc loaded in a disk drive by using jitter value or jitter generation frequency. A method for setting write strategy parameter in a disc drive comprises: a step(501) recording test data, composed of a part of recordable Ts based on a plurality of write strategy parameters, in the disc loaded in the disk drive; a step(502) reproducing the recorded test data; a step(503) detecting jitter value or jitter generation frequency of the reproduced test data; and a step(504) setting up optimum write strategy parameter to the disc by using the detected jitter value or the jitter generation frequency. The T is one cycle of clock signals.
Patent KR-20090065973-A (KR)
Title: An improved driving device for a pumping device for pumping coating liquid, and a pumping device, a nozzle device and a coating device having the same
Inventor: LEE SOO YONG
IPC: B05C21/00
Filed: 2007-12-18
Abstract: A driving unit for a coating liquid pumping apparatus is provided to reduce the frequency of backlash caused by vibration in order to pump a coating liquid uniformly and accurately, thereby improving the quality of final products such as PDP and LCD panels. A driving unit(350) for a coating liquid pumping apparatus(300) comprises: an up/down moving member(308) moving up and down in order to flow in and out a coating liquid within a housing and supplying the coating liquid to a nozzle unit; an up/down moving member bracket(356) wherein the up/down moving member is mounted; a linear motor(390) moving the up/down moving member bracket mounted therein; a guide(394) guiding the linear motor; and an LM guide guiding the linear movement of the linear motor mounted therein.
Patent KR-20090066135-A (KR)
Title: Development of nonallergenic urushiol derivatives in catechol and veratrol forms
Inventor: MOON JAE HAK
IPC: C07C43/164
Filed: 2007-12-18
Abstract: A method for preparing veratrol type and catechol type urushiol derivatives, and the their uses are provided to obtain an excellent antioxidizing activity. The veratrol type and catechol type urushiol derivatives prepared do not induce allergy with maintaining the structural basic frame of urushiol. Preferably the urushiol derivatives have a side chain comprising a saturated hydrocarbon.
Patent KR-20090069529-A (KR)
Title: A forklift device with a tilting angle controlling structure of a mast
Inventor: PARK DONG IL
IPC: B66F9/22
Filed: 2007-12-26
Abstract: A forklift truck having the structure controlling the tilting angle of a mast is provided to reduce the falling risk of loaded stuff by controlling the tilting angle of the mast. A forklift truck having the structure controlling the tilting angle of a mast comprises: a tilting cylinder(100) providing the hydraulic force in order to compel the tilting operation of the mast; a hydraulic relief valve(200) and a solenoid valve(300) connected to the tilting cylinder in order to control the output flow rate provided to the tilting cylinder; and a tilting angle control part(500) connected to the tilting cylinder and the solenoid valve in order to control the tilting angle of the mast by sensing the relative tilting angle of the mast based on the rotation angle of the tilting cylinder. The tilting angle control part includes an angle sensor(520), a flow detection sensor(550) and a controller(510).