baber/WOPTO huggingface dataset:
Patent KR-20120019417-A (KR)
Title: System and method for guiding a cannon shell in flight
Inventor: MALUL ASSAF
IPC: F42B10/64
Filed: 2011-08-25
Abstract: PURPOSE: System and method for guiding flying ammunitions are provided to inhibits the front part of a device from spinning with the main part of ammunition since spin restraining force is generated by at least a set of fins. CONSTITUTION: A system(14) for guiding ammunitions comprises a front part(21), a rear part(22), and at least a pair of fins(26,28). The fins are connected to the outer surface of the front part. The fins are extended radially from surface. The front and rear parts are connected through a bearing device. The front and rear parts have a common longitudinal axis line. The front and rear parts spin to each other the bearing device. An angle of attack of the fin changes, so lift and aerodynamic roll stabilizing force for guiding the ammunitions according to a predetermined flying trajectory are provided during flying.
Patent KR-20130022867-A (KR)
Title: 상품할인정보 제공 방법 및 이를 실행하기 위한 프로그램이 기록된 기록매체
Inventor: KIM KWON
IPC: G06Q30/06
Filed: 2011-08-26
Abstract: 본 발명은, 이용자 단말기가 상품 할인정보 제공시스템에 정보통신망을 통해 접속되어지고, 상기 상품 할인정보제공시스템이 상기 이용자 단말기로 상품 할인정보를 제공하는 상품할인정보 제공 방법에 관한 것으로, (a) 상기 상품할인정보 제공시스템이, 할인상품을 제공할 각 상점의 위치 정보 및 연락처 정보를 포함하는 상점정보를 입력받아 메모리 수단에 유지하는 단계; (b) 상기 상점이 제공하는 상품 할인품목, 할인 적용 금액 및 할인유효기간을 포함하는 할인 관련 정보를 상기 상점정보에 대응하여 메모리 수단에 유지하는 단계; (c) 상기 상품할인정보 제공시스템이 이용자로부터 특정 구역 내의 상품 할인정보 제공을 요청받는 단계; (d) 상기 상품할인정보 제공시스템이 할인 정보 제공요청을 받은 시각으로부터 임의의 기간 내에 할인이 유효한 상품 할인정보 중 상기 구역 내에 위치한 상점의 상품 할인정보를 메모리 수단에서 검색하는 단계; 및 (e) 상기 이용자 단말기로 상기 상품할인정보 및 상기 상품할인정보에 대응하는 상점정보를 제공하는 단계;를 포함한다. 
본 발명에 따르면, 상품 할인정보를 구역별로 관리함으로써 소비자가 원하는 상품의 할인정보를 소비자가 원하는 구역에 따라 선별적으로 제공할 수 있어 소비자의 정보 활용성 및 편의성을 제고하는 효과가 있다.
Patent KR-20130027889-A (KR)
Title: Diode tester for solar cell module and method for testing bypass diode)
Inventor: AHN JIN HO
IPC: H01L21/66
Filed: 2011-09-08
Abstract: PURPOSE: A quality judgment unit and a quality judgment method of a bypass diode are provided to reduce a test cost and to decrease measurement time. CONSTITUTION: A quality judgment unit(100) of a bypass diode includes an input unit(110), a microcontroller(120), an H-bridge(130) and a voice output unit(140). The input unit receives the forward voltage in the normal range with respect to the bypass diode. The microcontroller controls the current direction of the bypass diode and judges the quality of the bypass diode based on the normal range of the input forward voltage. The H-bridge converts the current direction under the control of the microcontroller. The voice output unit outputs the voice signal under the control of the microcontroller according to the judgment result. [Reference numerals] (110) Input unit; (120) Microcontroller; (130) H-bridge; (140) Voice output unit; (150) Display unit; (160) LED display unit
Patent KR-20130029577-A (KR)
Inventor: KIM SEUNG GI
IPC: B08B1/02
Filed: 2011-09-15
Abstract: 본 발명은 강재의 모서리 라운딩 작업과 용접부위에 대한 프라이머 제거작업을 동시에 수행할 수 있는 장치의 제어방법을 개선한 것으로, 특히 모서리 라운딩을 위한 금형롤러와 프라이머 제거를 위한 브러시유닛의 연동 동작을 제어하여 상기 금형롤러와 브러시유닛의 설치 간격과 무관하게 강재의 전체 모서리 라운딩 작업을 물론 용접부위에 대한 프라이머 제거 작업을 완벽하게 수행할 수 있도록 하는 것이다. 이를 위한 본 발명은 강재를 일정속도로 이동시키는 컨베이어와, 상기 컨베이어에 설치되어 강재의 4모서리를 각각 향하도록 설치되는 금형롤러유닛과, 상기 금형롤러유닛을 수직방향 및 수평방향으로 이동시키는 이송유닛과, 상기 금형롤러유닛들 중 하나의 금형롤러유닛과 힌지 결합되어 금형롤러유닛으로부터 일정간격을 유지하는 브러시가 강재의 상면에 안착되는 브러시유닛, 및 상기 컨베이어의 이동속도를 기반으로 이송유닛의 작동을 단속하는 제어유닛으로 이루어진 강재의 모서리 라운딩과 프라이머 제거 동시 작업용 장치의 제어방법에 있어서; 상기 이송유닛을 작동시켜 금형롤러유닛을 강재의 4모서리에 가압 밀착시켜 이동 중인 강재의 모서리 라운딩과 강재의 상면 중앙부에 대한 프라이머 제거 작업을 수행하는 단계(S100); 상기 강재가 금형롤러유닛을 완전히 통과하는 동시에 상기 이송유닛을 반대 작동시켜 금형롤러유닛을 강재로부터 이격시키는 단계(S200); 및 상기 S200 단계 후, 강재가 브러시유닛을 완전히 통과하는 동시에 상기 이송유닛을 작동시켜 브러시유닛과 힌지 결합된 해당 금형롤러유닛을 강재로부터 수평방향 이격시키는 단계(S300); 로 이루어진 강재의 모서리 라운딩과 프라이머 제거 동시 작업용 장치의 제어방법에 관한 것을 그 기술적 요지로 한다.
Patent KR-20110112270-A (KR)
Inventor: LIM GWANG SIK
IPC: A61K8/97
Filed: 2011-09-25
Abstract: 본 발명은 자생하는 약용식물이 지닌 유효성분을 추출하여 경구복용이 가능하도록 정제(환) 또는 액상타입으로 제조하는 발모제 조성물 경구 투여제에 관한 것이다. 더욱 상세 하게는 약용식물인 하수오, 연자육, 건지황, 한련초, 당귀, 측백엽, 우슬, 창출, 감초, 계피, 마른생강이 지닌 유효성분을 추출하기 위해 약용식물을 건조하는 단계, 상기 건조된 약용식물을 분쇄하여 분말로 만드는 단계, 상기 분말을 물과 혼합하는 단계, 상기 혼합액을 용기에 넣고 가열하여 농축액(엑기스)을 추출하는 단계, 상기 농축액(엑기스)을 여과 후 전분과 혼합하여 환으로 제조하는 단계, 또는 상기 농축액(엑기스)을 여과 후 액상으로 파우치에 담는 단계를 거쳐 음용이 가능하게 하는 발모제 조성물 경구투여제 제조방법에 관한 것이다.
Patent KR-20130034405-A (KR)
Title: A jig for setting the location of skin the vehicle instrument panel
Inventor: KWON SEONG YONG
IPC: B60R13/04
Filed: 2011-09-28
Abstract: PURPOSE: A jig for determining position of a marker of skin is provided to accurately mount the marker to a predetermined position of a mold and to easily control the three-dimensional position of the jig. CONSTITUTION: A jig for determining position of a marker of skin comprises a support unit(100) and a fixed block(200). The support unit is installed in order to give an adhesive force to the marker(300) through an adhesive member(120) and comprises an angle controlling member. When the fixed block is mounted on one side of the mold through a mounting member, the fixed member rotates on one side of the mold so that the support unit contacts to mounting surface of the mold in parallel.
Patent KR-20120061031-A (KR)
Title: Character input apparatus equipped with auto-complete function, method of controlling the character input apparatus, and storage medium
Inventor: YAMADA MASAYUKI
IPC: G06F40/191
Filed: 2011-09-29
Abstract: PURPOSE: A character input apparatus, a controlling method thereof, and recording medium are provided to prevent degradation of usability by stopping an automatic complete function in case the visually disabled person inputs a character in a voice guide mode. CONSTITUTION: A completing unit presumes a character string based on an inputted character and completes the inputted character string by adding the presumed character string to a complementary part. A voice guide unit supplies selected key information through voice guide. A control unit(2000) controls the completing unit and does not perform the completion of the inputted character string.
Patent KR-20130034990-A (KR)
Title: Multi broadband combiner and tuning structure applied therein
Inventor: KIM JOONG KWAN
IPC: H01P5/04
Filed: 2011-09-29
Abstract: PURPOSE: A multi broadband combiner and a tuning structure applied therein are provided to facilitate the impedance matching between filters and to secure accurate tuning. CONSTITUTION: A low pass filter(120) is installed in the internal space of a housing in a longitudinal direction. A band pass filter(130) is adjacent to the low pass filter. A variable resonance matching unit(140) changes the capacitance of the low pass filter. A double helix tuning bolt combines a first tuning bolt with a second tuning bolt. The double helix tuning bolt forms the tuning of the low pass filter.
Patent KR-20130035712-A (KR)
Inventor: YOON JONG KUK
IPC: C01B33/159
Filed: 2011-09-30
Abstract: 본 발명은 제조공정이나 장치를 필요치 아니하며, 제조시간을 단축하고 반응물들이 균일하게 반응하여 균일한 입자 사이즈를 갖는 초 소수성의 실리카 에어로겔 과립을 제조할 수 있는 방법 및 이에 의해 제조되어 유전율 및 소수성이 우수하고 열전도도가 낮은 우수한 품질의 실리카 에어로겔 과립에 대한 것으로, a-1) SiO 2 를 5 ~ 20 중량% 포함하는 물유리를 제조하는 단계; a-2) 이온교환 수지와 물의 부피비를 1 : 1 ~ 1 : 5로 하여 이온교환수지를 세척하는 단계; a-3) 상기 a-1) 단계의 물유리와 상기 b-1) 단계의 이온교환수지를 1 : 1 ~ 1 : 3의 부피비로 혼합하여 교반하는 단계; a-4) 상기 a-3) 단계의 결과물을 필터링(filtering)하여 실리카 졸(sol)을 얻는 단계;를 포함하는 실리카 졸(sol)을 제조하는 단계; b) 용매에 분산제를 혼합하여 교반하는 단계; c) 상기 b)에 pH 조절제를 추가 투입하여 교반하는 단계; d) 상기 c)에 상기 a)의 실리카 졸(sol)을 투입하여 교반하는 단계; e) 상기 d)를 세척하는 단계; f) 상기 e)를 숙성 또는 표면 개질하는 단계; g) 상기 f)를 세척하는 단계; 및 h) 상압 건조하는 단계를 포함하는 실리카 에어로겔 과립의 제조방법을 제공한다.
Patent KR-20130053533-A (KR)
Title: Vehicle battery wireless charging system and vehicle thereof
Inventor: SUNG WOO SUK
IPC: B60L11/18
Filed: 2011-11-14
Abstract: PURPOSE: A battery wireless charging system of a vehicle and the vehicle thereof are provided to wirelessly charge a battery of the vehicle, thereby improving safety. CONSTITUTION: A transmitter(3) is installed in a charging site(1). The transmitter performs wireless charging through an upper side surface. A receiver(5) corresponds to an upper side of the transmitter. The receiver performs wireless charging with the transmitter. A garage controlling device controls a garage of a vehicle.
Patent KR-20130053130-A (KR)
Title: Controll system and method for airbag with active-vent
Inventor: SEO JEONG WOOK
IPC: B60R21/23
Filed: 2011-11-15
Abstract: PURPOSE: An active vent airbag control system and a control method thereof are provided to maximally protect passenger under various kinds of situation by interlocking operation of an active vent with first development, second development, and a seat belt. CONSTITUTION: An active vent airbag control system comprises a first inflator, a second inflator, an active vent, and a control unit. The active vent selectively forms a vent according to movement of an operating unit. The control unit operates the first inflator if a first development condition is satisfied. The control unit operates the second inflator if a second development condition is satisfied for an hour and operates the active vent if the second development condition is not satisfied. The control unit operates the active vent for two hours if the second inflator is operated. [Reference numerals] (AA) Start; (BB) End; (S110) First deployment condition?; (S120) First deployment; (S210) Measure a first time; (S220) First time < 120ms ?; (S230) Second deployment condition?; (S240) Second deployment; (S300) Operate an active belt; (S410) Wearing a seat belt?; (S420) Measure a second time; (S430) Second time = 24ms; (S500) Maintaining over a third time?
Patent KR-20130053795-A (KR)
Title: Sound source localization apparatus and operating method thereof
Inventor: HONG JONG HEUI
IPC: G01S3/80
Filed: 2011-11-16
Abstract: PURPOSE: A sound source position tracking device and an operation method thereof are provided to guarantee the position tracking function of the sound source. CONSTITUTION: An operation method of a sound source position tracking device comprises the following steps: a step(307) of separating a frequency band used for sound source position tracking into a plurality of subfrequency bands; a step(309) of producing a sound source signal of different sound source positions and different subfrequeny bands consecutively in different times; a step(311) of receiving the produces sound source signal through a plurality of microphones; and a step(319) of removing the subfrequency band of the sound source including the noise higher than the reference value based on the received sound source signal from a frequency band used for the sound source position tracking. [Reference numerals] (301) Monitor a cross-correlation level value for a sound source signal; (303) Cross-correlation level value < Threshold ?; (305) Drive a speaker for sequential generation of the sound source signal; (307) Separate a frequency band used for sound source position tracking into a plurality of sub-frequency bands; (309) Consecutively generate the sound source signal of different sound source positions and different sub-frequency bands in different times; (311) Receive the sound source signal through a microphone; (313) Measure a delay time of the received sound source signal; (315) Determine an ideal delay time corresponding to a sound source position; (317) Difference between the measured delay time and the ideal delay time > Tolerance ?; (319) Remove the corresponding sub-frequency band in the frequency band used for sound source position tracking; (321) Sound source signal in all sub-frequency bands generated?; (323) Trace the sound source position by the not removed sub-frequency bands; (AA) Start; (BB,DD,GG) No; (CC,EE,FF) Yes; (HH) End
Patent KR-20130054895-A (KR)
Title: A apparatus for treatment of coal-leached wastewater and a method for purification of coal-leached wastewater by the chemical activating treatment
Inventor: KIM MIN JOONG
IPC: C02F1/52
Filed: 2011-11-17
Abstract: PURPOSE: A treatment apparatus of coal-leached wastewater and a purifying method thereof are provided to precipitate the floating solid particle of coal-leached wastewater which is hard to treat with a conventional cohesion method, and to increase the removing efficiency of floating substance. CONSTITUTION: A treatment apparatus of coal-leached wastewater comprises the following steps of: a first precipitation step(S1) of precipitating a settleability solid particle; a collecting step(S2) of collecting the effluent containing a floating solid particle; a pre-treating step(S3) of pre-treating by the chemical activation processing of the coal-leached wastewater including the floating solid particle; a rapid precipitation step(S4) of a precipitating floating solid particle by the precipitating reaction agent; a separating supernatant and PH adjusting steps(S5); a discharging step(S6) of the final processed water; a collecting water step(S7) of a rapid-precipitating solid particle and the first precipitating solid particle; a dehydration step (S8) of the precipitating solid particle; and a discharging step of the separation solid particle. In the pre-treatment step, the activation reaction agent is injected, such that the surface of coal-floating solid particle is activated with the cation. In the rapid precipitation step, alkaline precipitation reaction agent is injected, such that the floating solid particle is neutralized and precipitated. [Reference numerals] (S1) First precipitation step for precipitating a settleable solid particle; (S2) Step of collecting effluent containing a floating solid particle which is not removed in the first precipitation step; (S3) Pre-treating step for chemically activating coal-leached wastewater including the floating solid particle; (S4) Step of rapidly precipitating the floating solid particle by a precipitating reaction agent; (S5) Step of separating supernatant and adjusting pH; (S6) Step of discharging the final processed water; (S7) Step of collecting the rapidly-precipitated solid particle and the first precipitated solid particle; (S8) Step of dehydrating the precipitated solid particles; (S9) Step of discharging the separated solid particles
Patent KR-20130056017-A (KR)
Title: Organic light emitting display apparatus
Inventor: CHO KYU SIK
IPC: H05B33/22
Filed: 2011-11-21
Abstract: PURPOSE: An organic light emitting device is provided to improve luminous efficiency through optical resonance by efficiently reflecting light. CONSTITUTION: A first electrode(108) is formed on a substrate(101). An intermediate layer(140) including an organic light emitting layer is formed on the first electrode. A second electrode(150) is formed on the intermediate layer. A reflection member(160) is formed around the intermediate layer to reflect visible rays from the intermediate layer. A pixel defining layer(130) is formed between the reflection member and the second electrode.
Patent KR-20110139676-A (KR)
Title: Portable presentation system
Inventor: CHA SONG CHOL
IPC: G06F3/14
Filed: 2011-11-24
Abstract: PURPOSE: A portable presentation system is provided to use s wireless electronic pen which emits an ultrasonic wave with a pair of location encoders. CONSTITUTION: A wireless pen(11) includes a ultrasonic transmitting unit by writing on a blackboard(100). A first and second receiver receives an ultrasonic wave and the sending time of the ultrasonic wave. A first and second MPU(Micro Processor Unit) analyzes information received from the first and second receiver and converts the information into first and second data. A first and second transmission unit transmits the first and second data to a terminal receiving module(14). A terminal(15) uses the distance of the first and second data and the first and second position readers(12,13) and determines the location of the wireless electronic pen. A projector(16) is connected to the terminal and projects an image to the board.
Patent KR-20130057664-A (KR)
Title: Air conditioning system for electric vehicle
Inventor: BAEK CHANG HYUN
IPC: B60H1/22
Filed: 2011-11-24
Abstract: PURPOSE: An air conditioning system for an electric vehicle is provided to precisely control the cut-off of a heater control unit without malfunctioning by determining the overheating of the heater control unit with reference to the maximum temperature through a matrix infrared image sensor and an analyzing unit. CONSTITUTION: An air conditioning system for an electric vehicle comprises: a matrix infrared image sensor(30) which detects infrared rays emitted from a heater control unit(7) by imaging the heater control unit and divides the heater control unit images into image cells of a matrix; an analyzing unit(40) which analyzes the temperature distribution of the heater control unit through image cells sensing infrared ray emission among the image cells of the heater control unit inputted from the matrix infrared image sensor, detects a part of the analyzed temperature distribution of the heater control unit corresponding to the maximum temperature, and converts the detected part into a corresponding temperature; and a control unit(50) which cuts off electricity applied to the heater control unit when the maximum temperature of the heater control unit converted by the analyzing unit is over a predetermined reference temperature. [Reference numerals] (20) Highest-temperature detecting unit; (30) Matrix infrared image sensor; (40) Analyzing unit; (50) Control unit; (8) Microcomputer; (9) IGBT device; (9a) Battery
Patent KR-20130062022-A (KR)
Title: A device for detecting refrigerant leakage and a method for detecting refrigerant leakage using the same
Inventor: LEE KWANG HO
IPC: G01M3/20
Filed: 2011-12-02
Abstract: PURPOSE: A device for sensing a refrigerant leakage of a heat exchanger and a method for sensing the refrigerant leakage of the heat exchanger using the same are provided to improve the accuracy of sensing the refrigerant leakage and accurately sense the existence of the refrigerant leakage regardless of the material of the heat exchange pipe of the heat exchanger. CONSTITUTION: A device(200) for sensing a refrigerant leakage of a heat exchanger comprises a body(210), a mixing unit, a storage tank, a head unit(220), and a sensing unit. The body includes a seating stand(211) where the heat exchanger is seated and a receiving unit(213) arranged under the seating stand. The mixing unit mixes the refrigerant and the compressed air of high pressure, thereby generating mixed gas. The storage tank stores the mixed gas. The head unit installed on the seating stand receives the mixed gas from the storage tank through one or more inlets arranged on one side. The head unit is connected to the inlets in the other side. One or more fixtures where a refrigerant inlet and a refrigerant inlet are directly or indirectly connected are arranged on the other side of the head unit. The sensing unit senses the refrigerant leaked out from the heat exchanger.
Patent KR-20130064861-A (KR)
Title: Slim etching apparatus
Inventor: PARK HYOUNG GUEN
IPC: H01L21/306
Filed: 2011-12-09
Abstract: PURPOSE: A slim etching device is provided to improve the quality of a wafer by uniformly etching the entire surface of the wafer. CONSTITUTION: A chamber(110) includes a preset space. An etching bath(120) accommodates an etching solution. A moving shaft(140) is formed on the upper part of the etching bath. A cassette(150) is connected to the lower part of the moving shaft. A jig(160) is attached or detached to or from the cassette. A rotation transfer unit(190) rotates the jig in the etching bath.
Patent KR-20130082589-A (KR)
Inventor: KIM HYOUNG JUN
IPC: G06Q50/02
Filed: 2011-12-09
Abstract: PURPOSE: An animal growth and reproduction management system and a method thereof are provided to predict the exact timing of estrus, effectively collect the relevant information regarding the estrus, and provide the information to a user. CONSTITUTION: An ENS (Estrus Notification System) terminal attached to an animal collects the biometric information about the animal and transmits the collected information to a wireless gateway (500,502). The wireless gateway transmits the biometric information to an ENS server (504). The ENS server calculates out the timing of estrus of the animal based on the biometric information and the information of the animal in a database (506). The ENS server transmits the information for notification including the calculated estrus timing to a registered user terminal (508). [Reference numerals] (500) The biometric information including an animal's workrate changes, mounting activities, and body temperature changes is collected; (502) The biometric information collected by an ENS terminal is transmitted to a wireless gateway; (504) The wireless gateway transmits the biometric information collected by ENS terminals to an ENS server; (506) The ENS server calculates the timing of estrus of the animal based on the biometric information and the information of the animal in a database; (508) The ENS server transmits the information for notification including the calculated estrus timing to a registered user terminal; (AA) Start; (BB) End
Patent KR-20130069925-A (KR)
Inventor: KIM SEUNG CHAN
IPC: C12Q1/68
Filed: 2011-12-19
Abstract: PURPOSE: A DNA oligomer is provided to enhance knock-down effect by interfering with stable DNA, to control amyloid beta deposition and system thereof by regulating amyloid beta precursor protein expression level, and to prevent cell apoptosis and dementia. CONSTITUTION: A method for decreasing amyloid beta precursor protein expression level in cultured cells or tissues, and organisms comprises a step of preparing a DNA oligomer with 10 or more base pairs, which complementarily binds to amyloid beta precursor protein. The DNA oligomer contains 3'-tgagcggaccgagactcg-5'(DNA strand which is complementary to upstream sequence), 3'-gctcgtacacgcgtacca-5'(DNA strand which is complementary to midstream sequence), and 3'-ttatttatgtaagaacct-5'(DNA strand which is complementary to downstream sequence) of 18 base pairs. The DNA oligomer is prepared by synthesis of a PCR primer. [Reference numerals] (AA) Front sequence(underline = complementary strand, 3'---5' = antisense DNA sequence); (BB) Middle sequence(underline = complementary strand, 3'---5' = antisense DNA sequence); (CC) Rear sequence(underline = complementary strand, 3'---5' = antisense DNA sequence)
Patent KR-20130070151-A (KR)
Title: Azaindenoanthracene derivative and organic electroluminescence device using the same
Inventor: LEE IN HYUK
IPC: H01L51/50
Filed: 2011-12-19
Abstract: PURPOSE: Aza indeno anthracene derivative is provided to improve luminous efficiency, brightness, power efficiency, driving voltage and lifetime of the organic electroluminescent element. CONSTITUTION: The compound is indicated as the following chemical formula 1. In the chemical formula 1, X is respectively carbon or nitrogen and at least more than one among X is nitrogen. R1 - R12 is respectively selected from the 'group comprising hydrogen, deuterium, C1~40 alkyl group, C2~40 alkenyl group, C6~40 aryl group, C5~40 heteroaryl group, C6~40 aryloxy group, C6~40 arylamino group, C6~40 diarylamino group, C7~40 arylalkyl group, C7~40 arylalkenyl group, C3~40 cycloalkyl group and C3~40 heterocycloalkyl group '.
Patent KR-20130071618-A (KR)
Title: Method and apparatus for synthesizing methane from syngas
Inventor: KOH DONG JUN
IPC: B01J19/24
Filed: 2011-12-21
Abstract: PURPOSE: A manufacturing method of methane from synthetic gas is provided to minimize equipment cost due to process simplification, thereby effectively manufacturing methane by an insulative reactor. CONSTITUTION: A manufacturing method of methane comprises a step of forming a mixed gas by adding steam into a synthetic gas including carbon monoxide and hydrogen as main ingredients; a step of supplying the mixed gas to an isothermal reactor; and a step of synthesizing methane by transferring gas with high methane content to insulative reactors (7-9). 10-50 vol% of steam is added based on the total volume of the synthetic gas and steam. The isothermal reactor supplies saturated water, and maintains temperature of an isothermal reactor.