baber/WOPTO huggingface dataset:
Patent KR-20010016117-A (KR)
Title: Convertible mirror plane to spherical mirror
Inventor: JUNG YOUN SU
IPC: G02B5/08
Filed: 2000-11-08
Abstract: PURPOSE: A reflection mirror converted into flat mirror and curved mirror is provided to be converted into the flat mirror and the curved mirror by using the flexibility of a mirror, thereby being used as the flat mirror for monitoring a rear view field in ordinary times and used as the curved mirror for assuring an wide view field in desired times. CONSTITUTION: The reflection mirror converted into flat mirror and curved mirror comprises a case, a flexible thin mirror(20) and an actuator(30). A groove is formed on a front edge of the case. The edge of the flexible thin mirror(20) is inserted into the groove of the case to be slided along the groove. The actuator(30) is mounted on the center of a rear surface of the flexible thin mirror(20) and a motion part(31) of the actuator is contacted to the rear surface. The thin mirror(20) is converted into a curved mirror by projecting the motion part(31) against the thin mirror.
Patent KR-20010087137-A (KR)
Title: Fixing method of bearing member for cylindrical body, fixing structure of bearing member for cylindrical body, electronic photo photoconductor with bearing member attached thereto, print cartridge and image forming device
Inventor: KANAGAWA TAKASHI
IPC: F16D1/08
Filed: 2000-11-17
Abstract: PURPOSE: To provide a fixing method and a fixing structure of a bearing member on a cylindrical body improving contact accuracy of the cylindrical body of an electrophotographic photoreceptor or the like, a printer cartridge, and an image forming device. CONSTITUTION: A cylindrical body 10 is pressed to be spread in an external diametric direction based on diametric spreading action by elasticity of a first and a second insertion member 16, 20 when it is inserted into the cylindrical body 10 from its end part, the cylindrical unit 10 and a bearing member 12, 14 fitted to its external peripheral surface are tightened. A second insertion member 18 is inserted into the first insertion member 16, a fourth insertion member 22 is inserted into a third insertion member 20.
Patent KR-20010035042-A (KR)
Title: Mobile archival device for utilizing USB interface and flash memory
Inventor: KIM BYEONG GWANG
IPC: G06F13/10
Filed: 2000-11-24
Abstract: PURPOSE: A portable storage device using a USB interface and a flash memory are provided to store data by simply being inserted into a USB port of a personal computer body, and by directly communicating with the personal computer body in a USB mode. CONSTITUTION: A microcontroller(2) is connected to a USB port of a personal computer(1). In addition, the microcontroller(2) receives and sends data through a D-plus. An external ROM(3) stores firmware. A decoder(4) receives an address from the microcontroller(2), and decodes the address to a flash memory select signal. A plurality of flash memories(5-8) connected to the decoder(4) store the data.
Patent KR-20010052013-A (KR)
Inventor: ARIMOTO KAZUTAMI
IPC: G11C8/18
Filed: 2000-11-29
Abstract: PURPOSE: To provide a semiconductor memory capable of easilily dealing with the extension of banks without increasing chip area and realizing high speed access. CONSTITUTION: A central row system control circuit 1 transmits an internal row address signal RA < 8:0 > in common to each memory sub-block MSB a common bank of memory mats NM1, NM2 asynchronously with an external clock signal, also, latches a block selecting signal BS < 7:0 > specifying a memory sub-block synchronizing with an internal clock signal CLKR, and transmits it to each memory sub-block. Also, a spare discriminating circuit 4 performs spare discrimination asynchronously with a clock signal.
Patent KR-20020042337-A (KR)
Title: Novel grass species Benest 3
Inventor: KANG BYEONG CHEOL
IPC: A01H5/00
Filed: 2000-11-30
Abstract: PURPOSE: A Benest 3, a new kind of grass is provided to supply the effect of strong propagation power through various methods of asexual reproduction and to supply the grass superior in quality and to supply a superior ball support because the leaves are straight and to reduce the frequency of mowing the grass because the length of the leaves is short. CONSTITUTION: The Benest 3, the new kind of grass includes a method for asexual reproduction. Zoysia grass has strong creeping characteristics and it is extended sideways by rhizomes and stolons and thereby propagation is carried out. Rhizomes are extended horizontally and a bud is generated in each joint and it becomes a shoot and finally it becomes a stem producing branches and the root comes out from each stem of rhizomes. And stolons are the vertical stems and also in stolons, the shoot and root come out from each stem. The Benest 3, the new kind of grass has the ability of propagation spread by rhizomes or stolons and thereby the grass of the dense cushion type is formed. The leaf of grass is 2.3±0.2mm wide and is 9.1±1.0cm long and stolons are 50.5±13.3cm long.
Patent KR-20010096524-A (KR)
Title: A method of joining a vane cavity insert to a nozzle segment of a gas turbine
Inventor: BURDGICK STEVEN SEBASTIAN
IPC: F01D25/12
Filed: 2000-12-08
Abstract: PURPOSE: A method of attaching inserts in vane cavity is provided to improve the insert ability of the inserts and the robustness of the joint connection between the inserts and the nozzle, and the repeatable manufacturing ability of the inserts. CONSTITUTION: An insert(70) containing apertures for impingement cooling a nozzle vane of a nozzle segment in a gas turbine is inserted into one end of a vane. A leading end(76) of the insert is positioned slightly past a rib(74) adjacent the opposite end of the vane through which the insert is inserted. The end of the insert is formed or swaged into conformance with the inner margin of the rib. The insert is then brazed or welded to the rib.
Patent KR-20020046813-A (KR)
Title: User verification method by using voice for use in electronic commerce
Inventor: BAN YEONG HUN
Filed: 2000-12-15
Abstract: PURPOSE: A method for certifying a user using a voice in an electronic commerce is provided to certify a user by obtaining a voice of a service user, comparing a voice inputted by the service user with the certification information, embodying a certification number, and comparing a certification number inputted by the service user with the pre-embodied certification number when a commodity purchase is requested. CONSTITUTION: A user ID for an electronic commerce is embodied to a service user in a certification server(304). A voice is obtained from the service user as certification information in the certification server(313). The voice being inputted from the service user is compared with the pre-obtained voice as the certification information, and a certification number is selectively embodied to the service user(320). A certification number being inputted by the service user is compared with the pre-embodied certification number in a shopping server, and an electronic commerce is selectively supplied to the service user(321).
Patent KR-20020048033-A (KR)
Title: Method of manufacturing steel plate to be precipitating TiO and TiN by nitriding treatment for welded structures
Inventor: CHOI HAE CHANG
IPC: C23C8/24
Filed: 2000-12-15
Abstract: PURPOSE: A method for manufacturing a steel plate by nitriding treatment of low nitrogen steel is provided, in which TiN precipitates as well as TiO oxides are diffused in steel homogeneously to secure superior toughness in weld heat affected zone. CONSTITUTION: The method for manufacturing the steel plate for welded structure comprises the processes of casting a steel slab comprising 0.03 to 0.17 wt.% of C, 0.01 to 0.5 wt.% of Si, 0.4 to 2.0 wt.% of Mn, 0.005 to 0.2 wt.% of Ti, 0.0005 to 0.1 wt.% of Al, 0.005 or less wt.% of N, 0.0003 to 0.01 wt.% of B, 0.001 to 0.2 wt.% of W, 0.03 wt.% or less of P, 0.03 wt.% or less of S, 0.001 to 0.03 wt.% of O, a balance of Fe and other inevitable impurities wherein titanium content to oxygen satisfies 4<=Ti/O<=10; heating the steel slab in the temperature range of 1100 to 1250°C for 60-180 minutes so that N content in the steel slab satisfies 1.2<=Ti/N<=2.5, 10<=N/B<=40, 2.5<=Al/N<=7, 6.5 <=(Ti+2Al+4B)/N<=14 within the nitrogen content range of 0.008 to 0.03%; hot rolling the heated steel slab at a reduction ratio of higher than 40% over austenite recrystallization zone; and cooling the hot rolled steel sheet to the ferrite transformation finish temperature±10°C at a cooling rate of higher than 1°C/min.
Patent KR-20020048743-A (KR)
Title: Corrugate for an wiring harness in a motor vehicle
Inventor: LEE JONG UK
IPC: B60R16/00
Filed: 2000-12-18
Abstract: PURPOSE: A corrugate tube for a wiring harness is provided to prevent the exposure of the wiring harness to the outside and the resulting cutting or shorting of the wire harness by allowing bifurcated portions of the wiring harness to be received into and protected within a T-shaped structure having one inlet portion and two outlet portions. CONSTITUTION: A corrugate tube(10) for a wire harness has one inlet portion(11) and two outlet portions(12,13). The corrugated tube(10) is generally T-shaped. The corrugated tube is manufactured in an unfolded condition such that two T-shaped portions are symmetrical each other. When the corrugate tube(10) is in such unfolded condition, a wiring harness is disposed in the corrugate tube(10). Then, the corrugate tube(10) is folded. Then, the wiring harness is received and protected within the corrugate tube(10) by fixing the corrugate tube(10) by tape, band or clip.
Patent KR-20020056432-A (KR)
Title: Auxiliary apparatus of hitting exercise
Inventor: PARK GYEONG JUN
IPC: G01P15/08
Filed: 2000-12-29
Abstract: PURPOSE: A sub-tool for a hitting exercise is provided to recognize an output value by outputting a sound or a display according to a hitting intensity and a hitting position. CONSTITUTION: A sub-tool for a hitting exercise comprises a power measurement sensor(20) located in a hitting part for sensing a hitting intensity and a hitting position due to a hitting, an ADC(Analog to Digital Converter) transforming an analog signal detected from the power measurement sensor(20) and supplied through a port(32) to a digital signal, a controller(36) signal processing the digital value according to a built-in controlling program, a decoder(38) transforming a digital value performed by signal processing in the controller(36) to one selected value, a controller having a driver(40) operating an outputting part(50) according to the selected value, and the outputting part(50) supplying an output as a sound or a display.
Patent KR-20010030561-A (KR)
IPC: G03F7/20
Filed: 1998-07-24
Abstract: 시간 변화하는 광학계의 투과율 변화에도 불구하고 감광성 기판상의 노광광의 조도를 목표값으로 하기 위해서, 다음과 같이 노광 처리를 실행한다.  1장째의 웨이퍼(25)의 노광을 개시하기 전에, 20000개의 펄스를 공타한다.  1회째와 20000회째의 펄스 레이저 발진시에, 적분기 센서(10)와 조도 센서(28)의 출력 신호를 취입하여 광학계의 두개의 시점에서의 투과율을 산출하고, 두개의 투과율로부터 투과율 시간 변화 예측 직선을 산출한다.  노광이 개시되면, 투과율 시간 변화 예측 직선에 근거하여 광학계의 투과율을 노광 경과 시간에 의해서 산출하여 노광광의 강도를 제어한다.  따라서, 실제의 투과율 변동에 따라 웨이퍼상의 조도를 보상할 수 있다.  또한, 웨이퍼(25)상에서의 노광 도우즈가 목표값으로 되도록 웨이퍼(25)에 입사되는 노광광의 적산 광량을 조절한다.  이에 따라, 조명 광학계나 투영 광학계의 투과율이 노광 중에 변동하더라도, 웨이퍼(25)상에서의 노광 도우즈가 목표값으로 된다.
Patent KR-20010022161-A (KR)
IPC: H01M10/05
Filed: 1999-05-25
Abstract: 규소를 활물질로서 포함한 소결체와 집전체 사이의 접촉저항을 저감할 수 있는 2차 전지용 음극의 제조방법을 제공한다. 규소를 포함한 음극재료에 바인더 및 용제를 가해 슬러리(slurry)를 제작하고, 슬러리를 도전성금속의 박 또는 메시(mesh)로 이루어진 기재상에 도포하고, 용제를 제거하여 도막을 제작하고, 그리고 도막을 비산화 분위기에서 소성하여 기재와 일체화시킴과 동시에 소결한다.
Patent KR-20010023836-A (KR)
IPC: A61C5/77
Filed: 1998-09-11
Abstract: A method for making artificial tooth bridges having a ceramic densely sintered high strength individual core veneered with porcelain using powder metallurgical methods, wherein the individual bridge parts are joined together as a bridge core with glass, which in molten condition wets the ceramic core material. The glass therefore finds its way into the gap between the bridge parts and reacts with the ceramics so that during cooling it forms a strong joint between the individual densely sintered ceramic bridge parts.
Patent KR-20010030929-A (KR)
IPC: C08F210/08
Filed: 1999-08-03
Abstract: 메탈로센 담지형 촉매로서 2개의 가교된 π전자 공액 배위자를 갖는 유기  전이금속 화합물과 알루미녹산을 불활성 용매 속에서 반응시키는 공정(a), 공정(a)에서 생성된 반응 생성물과 무기 미립자상 담체를 불활성 용매의 존재하에 85 내지 150℃의 온도에서 접촉시키는 공정(b) 및 공정(b)에서 생성된 고체 생성물을 함유하는 슬러리를 -50 내지 50℃의 온도에서 지방족 탄화수소를 사용하여 2회 이상 세정하는 공정(c)을 순차적으로 실시하여 수득되는 고체 생성물로 이루어진 것을 사용함을 특징으로 하는 프로필렌//프로필렌/올레핀·블록 공중합체의 제조방법 및 당해 공중합체.
Patent KR-20010032660-A (KR)
IPC: C08G59/40
Filed: 1998-10-29
Abstract: 본원에서는 금속 기판 처리 방법을 개시한다.  상기 방법은 상기 처리될 기판 표면을 마니히-유도체화 폴리에테르(Mannich-derivatized polyether)와 접촉시키는 것을 포함한다.  상기 방법에 의하여, 상기 처리된 기판의 내부식성 및/또는 접착성이 개선된다.  또한, 본원에서는 중합체 기판을 처리하기 위한 유사한 방법을 개시한다.
Patent KR-20010033101-A (KR)
Title: 쾌삭성 동합금
IPC: C22C9/04
Filed: 1998-11-16
Abstract: 본 발명의 쾌삭성 동합금은 아연의 함유량을 종래의 쾌삭성 동합금에 비해 대폭 절감시키면서, 공업적으로 충분히 만족할 수 있는 쾌삭성을 확보할 수 있는 것으로, 동 69∼79중량%, 규소 2.0∼4.0중량% 및 아연 0.02∼0.4중량%를 함유하고, 또한 잔부가 아연으로 이루어진 합금조성을 이루는 것이다.
Patent KR-20010040366-A (KR)
Title: 롤러 프레스 그라인딩 플랜트
IPC: B02C23/12
Filed: 1998-06-12
Abstract: 본 발명은 원료 물질을 부수어 파편으로 하기 위한 고압의 롤러 프레스; 상기 고압의 롤러 프레스로부터의 상기 파편들을 미세한 파편들과 상기 고압의 롤러 프레스로 되돌려지는 거친 파편들을 거르기 위한 정적 캐스케이드 시프터(cascade sifter); 및 상기 정적 캐스케이드 시프터로부터의 상기 미세한 파편들을 미세한 제품 파편들과 최소한 약간의 상기 덜 미세한 파편들이 상기 고압의 롤러 프레스를 먼저 통과하는 것 없이 상기 정적 캐스케이드 시프터로 되돌려질 덜 미세한 파편들로 구분하기 위한 분리기로 구성된 것을 특징으로 하는 롤러 프레스 그라인딩 플랜트(roller press grinding plant)에 관한 것이다.
Patent KR-20010034547-A (KR)
IPC: A61P1/00
Filed: 1999-02-25
Abstract: Pharmaceutical compositions for the therapy and the prevention of ulcer and dyspepsia relapses comprising as essential components the following components a) and b): component a): one or more components selected from the conventional anti-ulcer products; component b): organic compounds containing the -ONO2 function, or inorganic compounds containing the -NO group, characterized in that they are NO nitric oxide donors.
Patent KR-20010042748-A (KR)
IPC: H04N19/86
Filed: 2000-01-13
Abstract: 비디오 코딩에서의 양자화(quantization)는 손실 처리이며, 그것의 주요 결과로써 디코딩 과정 동안 두 블록의 경계에서 발생하는 블록킹 인공물(blocking artefact)들을 가진다. 본 발명은 이들 블록킹 인공물들을 제거하는 방법에 관한 것이다. 그것은 경계를 스트래들링(straddling)하는 픽셀들의 세그먼트(segment)에 적용되는 디코딩 과정에서 필터링 단계를 실행하고, 세그먼트는 색차 유사 기준(chrominence similarity criterion)(단계 1)에 부합하는 종단에서 픽셀들을 가지며 즉, 필터링은 종단에서 상기 픽셀들이 유사한 컬러를 가지는 세그먼트들에 적용된다.
Patent KR-20010088302-A (KR)
Title: 헬리코박터 감염에 대한 비경구 면역화 방법에 있어서의ｌｔ 및 ｃｔ
IPC: A61P31/04
Filed: 1999-06-18
Abstract: 본 발명은 하나 또는 그 이상의 헬리코박터 항원 및 아쥬번트로서 LT 및/또는 LTB를 포유동물에 비경구적으로 투여함으로써 포유동물에서 헬리코박터 감염에 대한 방어성 또는 치료성 면역 반응을 유도하는 방법을 제공한다.
Patent KR-20020057498-A (KR)
Title: An edible ink composition, solution for pretreatment, and their printing method
Inventor: BONG PIL HUN
IPC: C09D11/32
Filed: 2001-01-05
Abstract: PURPOSE: Provided are an edible ink composition and a pre-treating solution and a printing method using the ink composition and the pre-treating solution, which can print letters and images on food directly by using an ink-jet printer. CONSTITUTION: The edible ink composition comprises 0.1-10wt% of an edible pigment, 10-50wt% of starch syrup, 0.1-10wt% of alcohol, 0.005-0.5wt% of gelatin, and the balance being purified water. The pre-treating solution comprises 3-15wt% of edible glycerin, 5-20wt% of starch syrup, 0.1-10wt% of alcohol, and the balance being distilled water. And the printing method is performed by coating a material with the pre-treating solution and drying and then printing by using the edible ink composition.
Patent KR-20020062083-A (KR)
Title: Lpg vaporizer compound tester
Inventor: LEE YONG JOO
IPC: G01M3/00
Filed: 2001-01-19
Abstract: PURPOSE: A complex tester for LPG vaporizer is provided to check trouble of the LPG vaporizer. CONSTITUTION: A tester comprises a vacuum hose intake coupling valve(1) instantaneously taking in fuel to measure amount of LPG, air, mixing ratio and condition of LPG; a timing light(2) measuring condition of time setting of a vehicle; a display(3); a timing cord(4) connected with a time jack of an automobile system display to check current time of an automobile; an acceleration valve sensor(5) checking whether an acceleration valve is normally operated on acceleration; an oxygen sensor(6) measuring condition of exhaust gas; a control switch(7) setting setup values; a battery contacting cord(8) checking condition of a battery; and a valve(9) controlling amount of gas flowing in an inlet.
Patent KR-20020064386-A (KR)
Title: The new Bacillus sp. having an antibacterial effect against the bacterial soft rot disease and the prevention method of bacterial soft rot disease utilizing thereof
Inventor: KIM HAK EUNG
IPC: C12N1/20
Filed: 2001-02-01
Abstract: PURPOSE: Provided are a novel Bacillus sp. strain having an antibacterial effect against bacterial soft rot disease and a control and prevention method of bacterial soft rot disease using the strain without side effect. CONSTITUTION: The novel bacillus sp. GENO-100 strain(KFCC-11233) produces metabolites having antibacterial effect on Erwinia carotovora subsp. carotovora and Erwinia carotovora subsp. atroseptica. The control and prevention method of bacterial soft rot disease is characterized by spraying the culture solution of bacillus sp. GENO-101 strain(KFCC-11233) or the extract of its active ingredients while culturing potatoes, radish, cabbage carrot or melon, or by treating their roots therewith.
Patent KR-20020065057-A (KR)
Title: METHOD FOR SUPPORTING VoIP TELECOMMUNICATION OF NON-RAS ENDPOINT IN GATEKEEPER
Inventor: CHO JUN U
IPC: H04L12/66
Filed: 2001-02-05
Abstract: PURPOSE: A method for supporting a VoIP(Voice over Internet Protocol) call to a non-RAS(Registration/Admission/Status) endpoint in a gatekeeper is provided to support a free VoIP call service between an endpoint which supports an RAS and an endpoint which does not support the RAS by performing a service to the non-RAS endpoint which does not support the RAS. CONSTITUTION: An endpoint 1(100) transmits an ARQ(call Admission ReQuest)(102) to an endpoint 2(200) and a gatekeeper 1(150)(1). The gatekeeper 1(150) transmits an ACF(call Admission ConFirm) or ARJ(call Admission ReJect)(104) to the endpoint 1(100)(2). The endpoint 1(100) receives the ACF or ARJ, and transmits a setup(106) to the endpoint 2(200)(3). The endpoint 1(100) receives a call proceeding(108) from the endpoint 2(200)(4), receives an alerting(110) from the endpoint 2(200)(5), and receives a connect(112) from the endpoint 2(200)(6).
Patent KR-20010078776-A (KR)
Title: Method of controlling vapor venting in a fuel tank and valve therefor
Inventor: BENJEY ROBERT PHILIP
IPC: F02M25/08
Filed: 2001-02-06
Abstract: PURPOSE: To provide a control method for fuel vapor of a fuel tank simple in structure and a valve to control a fuel vapor flow. CONSTITUTION: This is a floating type vapor vent valve 16 for a vehicle mounted type fuel tank. One end part is fixed on a float 78 so as to move it limitedly only in the parallel direction to the moving direction of the float 78 by preparing a comparatively thin flaxible valve member 98, and the other end part with an interval is installed on the float 78 so as to move it limitedly only in the vertical direction relative to the moving direction of the float 78. This flexible valve member 98 is curved in one of the embodiments, and it is furnished flat in other embodiments.
Patent KR-20020067272-A (KR)
Title: Construction method for apartment's ceiling slab
Inventor: LEE JONG HUN
IPC: E04B5/38
Filed: 2001-02-16
Abstract: PURPOSE: A construction method for an apartment ceiling slab is provided to shorten the period of construction by simplifying the construction progress of a ceiling slab, to remove wastes in construction and to minimize inter layer noise and vibration. CONSTITUTION: The construction method for an apartment ceiling slab comprises the steps of: manufacturing a half PC(precast) composite slab(10) composed of a reinforcing bar(11) exposed to concrete(14), noise-reduction and insulation materials(12) placed under the reinforcing bar(11), a gypsum board attached to the bottom of the noise-reduction and insulation materials(12), and concrete(14) placed on the noise-reduction and insulation materials(12) to expose a portion of the reinforcing bar(11) upward; installing a form for forming a bearing wall(6); installing a reinforcing bar(21) and an upper bar(22) on the half PC composite slab(10); and placing concrete(23) on the half PC composite slab(10).
Patent KR-20010085676-A (KR)
Title: A Process for Producing Particulate, Water-soluble Cellulose Derivatives
Inventor: KIESEWETTER RENE
IPC: C08L1/00
Filed: 2001-02-27
Abstract: PURPOSE: Provided is a process for the production of particulate water-soluble cellulose derivatives, preferably those with a thermal flocculation point. CONSTITUTION: The process for producing particulate water-soluble cellulose derivatives, comprises: a) forming a feed composition comprising 20 wt. % to 50 wt. % of a cellulose derivative, based on the total weight of the feed composition, and 50 wt. % to 80 wt. % of water, based on the total weight of the feed composition, wherein the cellulose derivative is at least one of swelled and dissolved in the feed composition; b) contacting, in a high rotational speed impact mill, the feed composition with a heat exchange gas and carrier gas, thereby converting the cellulose derivative of the feed composition into a solid state form of finely particulate particles; c) separating the particulate cellulose derivative from the heat exchange gas and carrier gas; and d) optionally drying the particulate cellulose derivative.
Patent KR-20020069851-A (KR)
Title: Laudry seperating device for washing machine having drying function
Inventor: CHOI MU YONG
IPC: D06F18/00
Filed: 2001-02-28
Abstract: PURPOSE: A clothing separating device for a drying and washing machine is provided to prevent the decrease of the washing efficiency by rotating the pulsator alone and effectively separate the clothing from the inner wall of an inner tub by coupling with the pulsator, thereby increasing the drying efficiency. CONSTITUTION: A clothing separating device for a drying and washing machine includes a main body(102) in the ring shape with an outer diameter larger than an outer diameter of a pulsator(7), wherein the main body is separated from the pulsator by lifting by the buoyancy in the washing stroke and coupled with the pulsator by lowering by the tare in the drying stroke to rotate with the pulsator, thereby separating the clothing from the inner wall of an inner tub.
Patent KR-20020031024-A (KR)
Title: The object oriented study system through the completed feedback
Inventor: KWON SO
IPC: G06Q50/20
Filed: 2001-03-05
Abstract: PURPOSE: A learning target approaching system through a feedback is provided to make a user approach to the learning target through the an online real time communication education in a feedback type by making the user pass a re-evaluation through the feedback. CONSTITUTION: The system constructs a database with an original file, a problem contents explanation, a summary and problems. The evaluation steps through the problem contents explanation, summary and repeat problems for an attending subject classifies into the 3 steps consisting of a first learning evaluation having the problem of 4 choices, a second learning evaluation having the problem of 3 choices and a third learning evaluation having the problem of 2 choices. If the user does not pass the problems of respective evaluation steps, the user performs a problem re-evaluation of each type and re-learning through the feedback. In case of not passing the problem re-evaluation of each type and re-learning, the user is re-evaluated by moving to the next problem evaluation step in order to determine a completion or drop of attending subject.