baber/WOPTO huggingface dataset:
Patent KR-20100090346-A (KR)
Inventor: YOUN SENG LYUL
IPC: G09B23/04
Filed: 2009-02-06
Abstract: PURPOSE: A solid geometry is provided to help a user to improve education efficiency in short time through an education wood block. CONSTITUTION: An education tool is comprised of the division and cross section of a column, a horn, a cube, and a circular cylinder. An education is performed through a one to one method. Students learn the insufficient segment for a short time.
Patent KR-20100093917-A (KR)
Title: Controlling terminal for flying apparatus, controlling method for flying apparatus, and controlling system for flying apparatus
Inventor: YANG YEONG YIL
IPC: G09B9/24
Filed: 2009-02-17
Abstract: PURPOSE: A terminal for controlling a flying apparatus, a method for controlling a flying apparatus, and a system for controlling a flying apparatus are provided to enable a user to uniformly sprinkle agricultural pesticides using a flying apparatus. CONSTITUTION: A user interface unit(110) receives a selection command for at least one specific spot. The first location information detecting unit(100) detects at least one location information of at least one specific spot inputted through the user interface unit. A control unit(140) produces flying route information using the location information of at least one specific spot. The first communication unit(130) transmits the produced flying route information to a flying apparatus(10).
Patent KR-20100094666-A (KR)
Inventor: JO HYEON DONG
IPC: G02C7/08
Filed: 2009-02-19
Abstract: PURPOSE: A magnifier which includes a LED is provided to focus the light of a LED on the focus distance of a magnifier by rotating a LED body which is located on the body of a magnifier. CONSTITUTION: An LED body(4-1) is installed in the body(1) of a magnifier. The LED body is rotated in order to focus the light of a LED(4) on the focus of the magnifier(5). A small object or narrow groove is specifically observed by matching the light of the LED and the focus of the magnifier. A volume knob(3) controls the light of the LED when necessary. A supporting stand(6) is used in order to match the focus of the magnifier. The magnifier in which a LED is installed comprises a battery for carrying.
Patent KR-20100096340-A (KR)
Title: Opening and closing apparatus for camera lens door
Inventor: KIM SUNG JU
IPC: H04N5/225
Filed: 2009-02-24
Abstract: PURPOSE: An apparatus for opening and closing a camera lens door is provided to elastically support a hook protrusion through a leaf spring, thereby preventing shaking of a cover plate. CONSTITUTION: A cover plate is mounted on a base(200) to allow rotation thereon. A blade(300) connected to the cover plate opens and closes an opening when the cover plate rotates. A leaf spring is arranged between the base and the cover plate. In the cover plate, a hook protrusion contacting the leaf spring is formed.
Patent KR-20090122878-A (KR)
Title: Container
Inventor: YAMAGAJO TAKASHI
IPC: B65D25/02
Filed: 2009-02-26
Abstract: PURPOSE: A receiving container is provided, which makes deciphering of each wireless tag possible even though lots of articles with a wireless tag are received. CONSTITUTION: A receiving container(2) receives one or more article(6) equipped with a wireless tag(7) and has a conductor(22) corresponding to the answer signal emitted from the wireless tag against the reader writer antenna or the inquiry signal emitted from the reader writer antenna(3) against the wireless tag. The receiving container is equipped with a member which divides the space of the receiving container into a plurality of domains. The conductor is attached to the member dividing the space of the receiving container.
Patent KR-20100098963-A (KR)
Title: Electrochemical energy storage device
Inventor: CHOI SANG JIN
IPC: H01G9/02
Filed: 2009-03-02
Abstract: PURPOSE: An electrochemical energy-storage device is provided to expand the lifetime of the device by forming an internal bottom plate between a storage element and a safety vent in a case. CONSTITUTION: A storage element(310) stores electrochemical energy. A case contains the storage element. A safety vent is formed on the lower side of the case and discharges gas when the internal pressure is more than a pre-set pressure by gas generated from the operation of the storage element. A terminal plate(330) is formed on the upper side of the case and electrically connects with the outside. An internal bottom plate(350) is formed into a plate shape between the safety vent and the storage element and supports the storage element in case of the deformation of the safety vent.
Patent KR-20100104087-A (KR)
Title: 3d preview and automatic estimation system for hoem interior
Inventor: KIM DONG SEOP
IPC: G06T19/00
Filed: 2009-03-16
Abstract: PURPOSE: A 3D preview and automatic estimation system for a home interior is provided to simulate a home interior proper to the taste of a user before construction. CONSTITUTION: A driving module includes a 3D image module, a design module, an estimate module and a settlement module. The 3D image module creates a 3D image in which a wall paper and a floor are applied to a construction target space based on the information selected from a database. The design module enables a consumer to perform a home design by utilizing a design pattern DB, and an estimate module calculates the construction cost for the determined design. The payment module pays an estimate cost.
Patent KR-20100104971-A (KR)
Inventor: KANG SUNG HOON
IPC: B62D6/00
Filed: 2009-03-20
Abstract: 본 발명은 능동 제어 현가 장치인 AGCS(Active Geometry Control System)가 별도의 전압분배회로와 A/D 컨버터없이, 전류 센싱 회로(4)와 이를 이용하는 1개의 A/D 컨버터(5)만을 이용한 통합형 전류 회로 장치를 적용해, 상기 액추에이터(10)에 대한 전류 제어와 고장 검출을 함께 구현하여 부품수량과 원가를 줄이고, 특히 상기 액추에이터(10)를 구동하지 않은 상태에서도 고장을 검출할 수 있어 운전자에게 불편을 주지 않는 특징을 갖는다. 
       
     액추에이터, 전류, 고장
Patent KR-20100104991-A (KR)
Title: Wet processing system for high efficiency hybrids vocs using multi vortex and bio filter
Inventor: KIM NOR JUNG
IPC: C02F1/461
Filed: 2009-03-20
Abstract: PURPOSE: A VOCs(volatile organic compounds) wet processing system of high efficiency hybrid is provided to remove hydrophilic VOCs by a washing device and to improve efficiency. CONSTITUTION: A VOCs wet processing system comprises: a washing device(100) of spiral flow type, which removes hydrophilic odor and VOCs; a bio filter device(200) with a moisture removal function, which is mounted at the back end of the washing device; and an electrolysis device which generates electrolyzed water.
Patent KR-20100106730-A (KR)
Title: Glass comes used aggregate artificial marble and manufacturing method
Inventor: KIM SUN UI
IPC: C04B32/00
Filed: 2009-03-24
Abstract: PURPOSE: An artificial marble and a manufacturing method thereof are provided to prevent the discoloration or exfoliation of patterns printed on the marble, and the separation of aggregate. CONSTITUTION: A manufacturing method of an artificial marble comprises the following steps: filling aggregate(1) to a container(3) with 40~80% of amount; pre-heating the aggregate in 500~900deg C; adding molten glass(2) to the container with 20~60% of amount; slowly cooling the glass; processing the artificial marble; and separating the container.
Patent KR-20100108071-A (KR)
Title: 고압방전등용 안정기
Inventor: BAE SU HO
IPC: H05B41/24
Filed: 2009-03-27
Abstract: 본 발명은 안정기의 외부 크기를 변경하지 않고도 안정기의 효율을 향상시킬 수 있는 고압방전등용 안정기에 관한 것이다. 이를 위해 중심부 평판영역으로 기준으로 양 측에 측부 평판영역이 구비되며 상기 중심부 평판영역과 상기 측부 평판영역의 일측이 지지부 평판영역에 의해 결합되어 형성되는 상부 평판 및, 상기 지지부 평판영역의 대향하는 위치에 형성되는 상기 측부 평판영역에 결합되는 하부 평판을 포함하여 형성되며, 상기 상부 평판과 하부 평판을 복수 개로 구성하여 평판 모양이 서로 간에 일치하도록 겹치게 하여 형성되는 철심부; 통로가 형성되어 상기 중심부 평판영역을 삽입시키며, 상기 측부 평판영역들 사이에 배치되는 절연부; 및 상기 절연부의 외주부에 감싸지며, 상기 측부 평판영역들 사이에 배치되는 코일; 을 포함하여 형성되며, 상기 측부 평판영역들과 상기 중심부 평판영역 사이에 형성되는 공간은 직사각형으로 형성되고, 상기 측부 평판영역들의 폭의 합은 상기 중심부 평판영역의 폭의 99% 내지 101% 사이로 형성되며, 상기 측부 평판영역과 상기 중심부 평판영역 사이에 형성되는 공간의 폭은 상기 측부 평판영역의 폭의 110% 내지 120% 사이로 형성되는 고압방전등용 안정기를 개시한다. 
       
     안정기, 코일, 자속 밀도, E형 코어, I형 코어
Patent KR-20100062839-A (KR)
Title: Receiving apparatus for digital multimedia broadcasting
Inventor: KIM DUCK HWAN
IPC: H04N7/12
Filed: 2009-04-02
Abstract: PURPOSE: A digital multi-media broadcasting receiver is provided, which can reduce the delay time of data processing by altering the data processing method according to the mode of the signal inputted into the divided layers. CONSTITUTION: A base layer receiving processor(120) decodes the base layer stream among the signal of the RF tuners(160). An reinforcing layer receiving processor(130) decodes the enhancement layer stream among the signals of the RF tuners. A base layer mode detector(140) controls the data processing method of the base layer receive processor by the mode value detection of the base layer stream among signals of the base layer receive processor. An reinforcing layer mode detector(150) controls the data processing method of the enhancement layer receive processor by the mode value detection of the enhancement layer stream among the signals of the enhancement layer receive processor.
Patent KR-20100111051-A (KR)
Title: Composition for cleaning oral cavity and method for preparing the same
Inventor: JEON CHANG YONG
IPC: A61Q11/00
Filed: 2009-04-06
Abstract: PURPOSE: A mouthwash composition and a method for manufacturing the same are provided to protect condition of teeth surface from acidification and to treat dental caries and bad breath. CONSTITUTION: A mouthwash composition contains 8-10 weight parts of potassium chloride, 40-60 weight parts of potassium carbonate, 1-2 weight parts of magnesium chloride, 1-2 weight parts of calcium lactate, 3-7 weight parts of sodium citrate, and 2-5 weight parts of purified glucose in 100 weight parts of purified water. The composition is used in the form of liquid, paste(tooth paste), spray or ointment.
Patent KR-20100070971-A (KR)
Title: System and method for authenticating the personal-use of the contents using portable storage
Inventor: LEE JOO YOUNG
IPC: H04L9/32
Filed: 2009-04-10
Abstract: PURPOSE: A system and a method for authenticating the personal-use of contents through portable media are provided to use the contents without a restriction by confirming a registered domain key of a user. CONSTITUTION: A packager(230) depackages contents into a package key, package key information, and encrypted contents. An access controller extracts the domain information from the contents which is provided from the package key information. The access controller(240) extracts the reproduction information from the contents which is provided from the package key in the event the domain information and domain authentication information are identical. A controller(220) controls the operation of the packager and the access controller. The encrypted contents are provided to the controller and the controller provides the encrypted contents to a player(260).
Patent KR-20100116998-A (KR)
Title: Method for manufacturing oriental hair restorer
Inventor: CHOI HYEONG GEUN
IPC: A61P17/14
Filed: 2009-04-23
Abstract: PURPOSE: A method for manufacturing an agent of natural herb for hair growth is provided to prevent hair loss without toxicity and side effects. CONSTITUTION: A method for manufacturing an agent for natural herb for hair growth comprises: a preparing black soybean, aurantii nobilis Pericarpium, polygoni multiflori Radix, ginkgo Semen, schizandrae Fructus, lycii Fructus, coicis Semen, rubi Fructus, and ginseng; a step of preparing aurum; a step of mixing the herbs; a step of heating at 100-140°C for 6-10 and concentrating; a step of drying for pulverizing; and a step of mixing the herb ingredients in 70-100 times volume of water and heating at 90-110°C for 3-5 hours for concentrating.
Patent KR-20100117226-A (KR)
Title: Cutting module and peeling machine using thereof
Inventor: HWANG BO UI
IPC: A23N7/02
Filed: 2009-04-24
Abstract: PURPOSE: A peeling machine using a cutting module capable of discharging outer skin to outside through outer skin outlet without leaving outer skin is provided to facilitate the discharge of the peel in order to efficiently move the outer cover of an object to be processed. CONSTITUTION: A rotating plate is formed in a through hole(423). A knife edge(421) covers the through hole. A blade plate is combined to the lower part of the rotating plate. A part that is close to the center of the rotating plate is arranged between a floor surface and a cutting module about the rotating direction. A container accepts workpiece. A cutting module(420) is combined in the lower part of the container. An outer skin outlet is formed to the outside direction. A power device supplies the power in order to revolve the cutting module.
Patent KR-20090117625-A (KR)
Title: Display device, driving method for display device, and electronic apparatus
Inventor: TOMIDA MASATSUGU
IPC: G09G3/20
Filed: 2009-05-06
Abstract: PURPOSE: A display device, a driving method thereof, and an electronic device are provided to improve quality of a display image by suppressing the deflection of a driving current of an electro-optic device. CONSTITUTION: A pixel array includes an electro-optic device, a write transistor, storage capacity and a driving transistor. The storage capacity stores the image signal written by the write transistor. The driving transistor operates the electro-optic device according to the image signal stored in the storage capacity. Pixels are arranged in the pixel array with a matrix shape. The pixels correct a threshold value changing the source potential of the driving transistor to the potential subtracting the threshold voltage of the driving transistor from an initialization potential of the gate of the driving transistor. A power supply unit sets the different potential at the threshold value correction period and the light emitting period as the power potential of the power supply line supplying the current to the driving transistor.
Patent KR-20100131200-A (KR)
Title: 탄성흡음재를 이용한 목재마루 구조
Inventor: JEONG GI YOUNG
IPC: E04F15/22
Filed: 2009-06-05
Abstract: 본 발명은 탄성흡음재를 이용한 목재마루 구조에 관한 것으로서, 목재마루에 시공되는 목재패널의 사용량을 줄이면서 목재마루널의 탄력성, 흡음성 및 충격흡수 기능이 향상되도록 하는 탄성흡음재를 이용한 목재마루 구조에 관한 것이다. 
     본 발명의 탄성흡음재를 이용한 목재마루 구조는, 
     콘크리트 바닥; 
     소정의 두께를 갖는 상태로 상기 콘크리트 바닥 상측에 시공되며, 상부면에는 요철형태를 유지하는 다수개의 수용홈과 상기 수용홈의 표면에는 탄성보강용 접착제가 충진되는 다수개의 접착홀이 형성된 탄성흡음재; 
     상기 수용홈의 접착홀에 탄성보강용 접착제가 충진된 상태로 상기 각 수용홈에 시공되는 목재패널; 및 
     상기 목재패널과 교차되도록 목재패널의 상부에 시공되어 목재마루를 형성하는 목재마루널; 을 포함하는 것을 특징으로 한다. 
       
     탄성흡음재, 목재패널, 목재마루널
Patent KR-20100131707-A (KR)
Title: Lightning protection and method for a firing body
Inventor: CHOI GUN HWAN
IPC: H01T4/02
Filed: 2009-06-08
Abstract: PURPOSE: A lightning protection and method for a firing body are provided to concentrate the shielding range on a core element by forming arrestor in a triangular shape. CONSTITUTION: Three arrestors(20) are arranged around a core element(10) in a triangular shape. The shielding area(30) of the arrestors is overlapped on the core element. When there is lighting, one of arrestors absorbs the light to protect the core element from the lighting. A lighting counter counters the number of the lighting.
Patent KR-20100040239-A (KR)
Title: Fire alarm device
Inventor: TANAKA TATSUYA
IPC: G08B17/06
Filed: 2009-06-08
Abstract: PURPOSE: A fire alarm device is provided to use a plurality of kinds of integration circuits by selecting a fire detection unit and an acoustic unit and giving an alarm. CONSTITUTION: A fire alarm comprises an integrated circuit(1). The integrated circuit is connected to a fire detection part and an acoustic part. A light emitting circuit connection terminal(101) is connected to the light emitting circuit. The light-receiving circuit connection terminal(102) is connected to a light-receiving circuit. A thermal detection connection terminal(104) is connected to a thermal detection unit(3). A buzzer circuit connection terminal(107) is connected to a buzzer circuit(4). A speaker connection terminal(108) is connected to a speaker. The light receiving amplifier circuit forms a smoke detection unit.
Patent KR-20110002909-A (KR)
Title: A device for emitting different color light depending on water temperature
Inventor: CHIN SUNG SUP
IPC: E03C1/04
Filed: 2009-07-03
Abstract: PURPOSE: A device for emitting different color lights depending on water temperature is provided to enable a user to check the water temperature. CONSTITUTION: A device for emitting different color lights depending on water temperature comprises a turbine blade(32), a shaft(33), a generator(34), a temperature sensor and a lighting-emitting area. The shaft is combined with the turbine blade. The generator is combined with the shaft and generates electrical energy using the rotation of the shaft.
Patent KR-20110007393-A (KR)
Title: Pressing device for forming a thin plate
Inventor: KIM BOO YONG
IPC: B21D37/00
Filed: 2009-07-16
Abstract: PURPOSE: A press mold apparatus for the formation of thin plates is provided to precisely transfer materials since a contact member is completely separated from the material after completion of material formation. CONSTITUTION: A press mold apparatus for the formation of thin plates comprises a lower mold(100), an upper mold(200), a first guide plate(300), a second guide plate(400), a pressing plate(500), multiple pressing pins(600), and a separating unit. The lower mold and the upper mold are installed to correspond to each other. The second guide plate corresponds to the first guide plate. The pressing plate is installed at the upper end of the second guide plate. The multiple pressing pins press the pressing plate. The separating unit separates the contact unit and the material by moving the pressing plate when the upper mold is moved up.
Patent KR-20110007714-A (KR)
Title: Testing method for failure recognition system
Inventor: LEE JONG MOON
IPC: G09B7/08
Filed: 2009-07-17
Abstract: PURPOSE: A defect recognition system learning method is provided to reduce the learning time and improve the accuracy of learning method. CONSTITUTION: An item to be studied is selected(S12). The type of learning is determined such as new learning or previous learning(S14). The new category is formed(S16). The existing category is selected(S18). The rate of learning data is selected according to the category. The test is implemented through the real product(S26).
Patent KR-20110013886-A (KR)
Title: System for synchronising control screen between dms device and dmc/dmp device and method thereof
Inventor: PARK HYUN JIN
IPC: H04L12/12
Filed: 2009-08-04
Abstract: PURPOSE: A control screen synchronization system between a DMS(Digital Media Server) device and a DMC/DMP(Digital Media Control/Digital Media Player) device is provided to control a function specialized according to each DMS device. CONSTITUTION: A DMS device(100) supplies an SUIL(Synchronized User Interface Language) which synchronizes a DMC/DMP device(200) through a control screen. The control screen displays a menu for controlling an operation of the DMS device. The DMC/DMP device configures the control screen according to the DMS device by using the SUIL supplied from the DMS device. A home network device connects the DMS device and the DMC/DMP device.
Patent KR-20110015706-A (KR)
Title: A sunlight condenser apparatus use of a parabolic reflecting mirror aggregate
Inventor: HONG WON BAE
IPC: G02B5/10
Filed: 2009-08-07
Abstract: PURPOSE: A solar light condensing apparatus using parabolic reflective mirror assembly is provided to transmit the light without the loss of solar light. CONSTITUTION: A first parabolic glass reflector(1) receives and concentrates the solar light. A light transmitting tube(2) transmits the sunlight to another place. A solar energy concentration unit(3) concentrates a plurality of light transmission pipes on one place, and make it one light ray.
Patent KR-20110019919-A (KR)
Title: 소음방지형 이중 파이프
Inventor: JANG DONG WON
IPC: F16L11/12
Filed: 2009-08-21
Abstract: 본 발명은 소음방지형 이중 파이프에 관한 것으로, 
     종래에 있어서 상기 워터해머 현상에 의한 소음을 막는 이중 파이프는 액송관의 외주에 완충재를 휘감아 설치하고 액송관을 커버관내에 삽입하여 조립하며, 완충재는 적어도 1∼2 mm 정도의 두께를 가지기 때문에 파이프의 공칭 지름(액송관의 내경)에 비해서 커버관의 외경이 크게 될 수밖에 없어 소형화가 곤란하게 되는 문제가 있었던 바, 
     물결형 플라스틱관으로 이루어지는 커버관과, 커버관의 내측에 삽입되는 직선형 플라스틱관으로 이루어지는 송액관과, 커버관과 송액관과의 사이에 개재되는 완충재를 구비하는 소음방지형 이중 파이프에 있어서, 상기 완충재를 가요성을 구비하는 띠형상체 또는 끈 형상체를 폭이 좁아지는 방향으로 주름지게 해서 구성하고, 완충재의 폭이 액송관의 외주 길이 절반 이하가 되는 상태로 완충재를 커버관과 송액관과의 사이에 개재하여 커버관 내에서의 액송관의 움직임을 억제한 것을 특징으로 하는 본 발명에 의하면 액송관의 외주의 일부가 커버관의 내면에 접촉하는 것은 막을 수 없지만 완충재를 삽입하기 위한 스페이스가 좁아도 되므로 커버관의 내경과 액송관의 외경과의 차이를 종래보다 현격히 작게 할 수 있으면서도 종래와 동일한 정도 이상의 소음 억제 효과를 얻을 수 있게 되며, 액송관의 공칭 지름이 종래와 같아도 커버관의 외경을 종래보다 작게 할 수 있게 되므로 커버관 제작비용을 절감할 수 있게 될 뿐 아니라 작은 배관 스페이스에의 대응성을 크게 향상 시킬 수 있게 된다. 
       
     이중 파이프, 커버관, 액송관, 완충재
Patent KR-20110020358-A (KR)
Title: Led lighting device
Inventor: KWON SEON BAE
IPC: F21S2/00
Filed: 2009-08-24
Abstract: PURPOSE: An LED device is provided to improve assembly productivity by mounting all components on an external housing with a sliding method. CONSTITUTION: An external housing(10) has one open side. An internal housing(20) is installed in the external housing. An LED module(30) is mounted in the internal housing. A driving module(40) is installed between the external housing and the internal housing to control the LED module. A light transmission cover(50) is mounted on the open side of the external housing. A fixing cover(60) is mounted on both sides of the external housing. The external housing includes a plurality of combination guide rails to combine components with a sliding method. A mounting bracket(70) is installed in the external housing.
Patent KR-20110020985-A (KR)
Title: Manufacturing method of functional drinking water using water pepper
Inventor: HWANG SUN RYANG
IPC: A23L2/38
Filed: 2009-08-25
Abstract: PURPOSE: A producing method of a functional beverage using persicaria filiforme is provided to offer the physiologic effect of the persicaria filiforme, and to improve the astringent taste of the persicaria filiforme. CONSTITUTION: A producing method of a functional beverage using persicaria filiforme comprises the following steps; mixing 100parts of purified water by weight, 70~90parts of persicaria filiforme by weight, and 5~20parts of lespedeza bicolor by weight; and boiling the mixture at 100~120deg C for 1~2hours.
Patent KR-20110021402-A (KR)
Title: Tracking detector using neural-network and detecting method thereof
Inventor: CHOI JEOUNG NAE
IPC: G01R31/02
Filed: 2009-08-26
Abstract: PURPOSE: A device and a method for detecting a tracking are provided to accurately detect the tracking by learning specific information in a tracking current waveform through an artificial neural network. CONSTITUTION: A current waveform detector(10) detects a current waveform in a distribution board and a load end. A specific point detector(20) detects at least one specific point related to tracking from the detected current waveform. A tracking detector(30) determines whether the tracking occurs on a region with the current waveform and displays the determination result to the outside.
Patent KR-20110032104-A (KR)
Title: Ventilation system and control method thereof
Inventor: LEE BAEG GEUM
IPC: F24F7/06
Filed: 2009-09-22
Abstract: PURPOSE: A ventilation system and a control method thereof are provided to enable heat and smell to be quickly discharged from the kitchen by the enhancing of the air discharge performance of a hood. CONSTITUTION: A ventilation system comprises a hood(100), an air supply duct(206), an air discharge duct(208), a ventilation unit(200), a control panel(212), a controller(216). The hood externally discharges smell and polluted air from the kitchen. The air supply duct makes the outdoor air flow into the indoor space. The air discharge duct makes the indoor air flow out of the indoor space. The ventilation unit comprises an air supply fan and an air discharge fan. The air supply fan compulsively supplies the outdoor air to the indoor space through the air supply duct. The air discharge fan compulsively discharges the indoor air out of the indoor space through the air discharge duct.
Patent KR-20110032965-A (KR)
Title: 2개이상의 침전탱크를 가진 축산폐수등의 여과방식
Inventor: LEE SANG HA
IPC: B01D21/00
Filed: 2009-09-23
Abstract: 두 개이상의 침전조로 사이펀원리에 의하여 연속적으로 침전여과하는것이다.