baber/WOPTO huggingface dataset:
Patent KR-20020007276-A (KR)
Inventor: DO YOUNG SOO
IPC: B27N3/04
Filed: 2001-12-31
Abstract: PURPOSE: A reproduced fiber board and method for manufacturing the same are provided to improve strength and air permeability of the fiber board, and to maximize shape stability thereof. CONSTITUTION: The air permeable fiber board, having a density between 0.5 and 3grams per cubic centimeters, is comprised of 50 to 98 wt.% of waste fiber, 0.2 to 50 wt.% of solids of processing agent for maintaining the shape of the fiber, and 0.1 to 20 wt.% of water and residual substances. The method for manufacturing the reproduced fiber board is comprised of the steps of preparing a waste fiber web by purifying the waste fiber to remove binder, oil-based medicine, and other impurities therein, opening and carding to evenly array the fiber; layering the waste fiber web to an appropriate thickness; performing a multi-stage needle punching process more than two times to manufacture a waste fiber sheet with excellent physical properties, thermal insulation and hygroscopicity; depositing the sheet on a processing agent including a reaction binder or resin solution; and performing a preliminary drying process, thermal drying process and molding process in sequence.
Patent KR-20010071770-A (KR)
Title: 플라스틱 광학재료용 단량체 조성물, 플라스틱 광학재료및 렌즈
IPC: C08F222/24
Filed: 2000-05-29
Abstract: 본 발명은 굴절율(refractive index) 및 아베수(Abbe number)가 높고, 비중(specific gravity)이 낮으며, 염착성(dyeing property), 내열성(heat resistance), 내충격성(impact resistance) 등과 같은 우수한 물리적 성질을 갖는 플라스틱 광학재료를 제공하는 단량체 조성물에 관한 것이다.  조성물은 디(메틸)아크릴 화합물(di(meth)acryl compound), 디비닐벤젠(divinylbenzene) 및/또는 디비닐비페닐(divinylbiphenyl), 교차결합형 이소시아네이트 화합물(crosslinking-type isocyanate compound), 둘 이상의 티올기를 가지는 폴리티올 화합물(polythiol compound), 및 티오우레탄 결합촉진 화합물(thiourethane bonding accelerating compound)을 포함한다.  조성물의 유리기중합개시제(radical polymerization initiator)와의 반응으로 얻은 플라스틱 광학재료는 렌즈의 재료로 사용된다.
Patent KR-20010074935-A (KR)
Title: 정보의 압축 저장
IPC: H04N1/41
Filed: 2000-06-28
Abstract: 정보를 고정 크기 메모리에 저장하기 위한 압축 방법이 공지되어 있다. 정보를 구성하는 데이터 항목들(D(k))은 중요도가 저감되는 부분들(D(s,k))로 분할된다. 예를 들어, 화상의 DCT 블록들은 계층적으로 양자화(3)된다. 메모리(5)는 대응하는 메모리 층들(501 내지 504)로 조직된다. 연속적인 메모리 층들은 감속하는 메모리 위치들의 수를 갖는다. 데이터 항목이 메모리에 적용될 때마다, 이것의 보다 덜 중요한 데이터 부분들은 이전에 저장된 데이터 항목들의 데이터 부분들에 대응하여 경합해야 한다. 지각있는 화상질에의 기여에 따라, 적용된 데이터 부분이 저장되거나, 저장된 데이터 부분이 유지된다. 링크들(511 내지 513, 521, 522)은 메모리에 저장되어, 데이터 항목이 저장된 경로를 확인한다. 마침내, 화상은 메모리에 정확하게 맞도록 자동적으로 압축된다.
Patent KR-20010099655-A (KR)
Filed: 1999-09-28
Abstract: 본 발명은 MEMS 장치의 기능 소자들인 탄소 나노튜브들을 제조하기 위한 시스템 및 방법에 관한 것이다.  본 발명의 방법은 탄소 나노튜브의 합성을 위한 MEMS 기판을 준비하는 단계를 포함한다.  나노사이즈 구멍 또는 촉매 보유 구조체가 나노튜브 촉매가 증착되는 MEMS 기판 상에 제조된다.  나노튜브는 나노사이즈 구멍 내에서 합성된다.
Patent KR-20010101964-A (KR)
Title: 합성수지와 금속판을 결합시키는 방법
IPC: B29C45/14
Filed: 2000-02-04
Abstract: 금속판과 합성수지가 결합된 제품을 제조하는 방법으로서, 금속판으로부터의 합성수지의 박리가 효과적으로 방지될 수 있는 방법을 제공한다. 
     금속판을 합성수지의 사출성형 금형내에 부착하고, 합성수지를 당해 금형내에 사출주입하여 금속판과 합성수지를 결합시키는데 있어서, 금속판의 둘레 가장자리부에 컬링부 또는 되접어꺾기부를 미리 설치하여 둔다, 당해 컬링부 또는 되접어꺾기부내에 가압주입된 합성수지의 발포, 팽창, 그리고, 당해 컬링부 또는 되접어꺾기부내에 들어간 합성수지의 경화, 수축을 이용하여, 금속판과 합성수지의 결합상태를 견고히 한다. 
     서로의 맞닿음면이 상사형으로 형성되어 있는 금속판과 열가소성 합성수지 성형품을 준비하고, 가열된 금속판에 열가소성 합성수지 성형품을 가압, 맞닿음시키고, 열가소성 합성수지 성형품의 맞닿음면의 용융, 그 후의 경화, 수축을 이용하여 금속판과 합성수지의 결합상태를 견고히 한다.
Patent KR-20010108183-A (KR)
IPC: D01F6/92
Filed: 2000-02-10
Abstract: 본 발명은 폴리트리메틸렌테레프탈레이트 섬유로 구성된 가연사의 권취패키지로서, 이 권취패키지의 경도, 권취밀도 및 권취된 가연사의 크림프수가 하기 (1), (2), (3) 의 조건을 동시에 만족하고 있는 것을 특징으로 하는 가연사 권취패키지를 제공하는 것이다. 
     (1) 70 ≤경도 ≤90 
     (2) 0.6 g/㎤ ≤권취밀도 ≤1.0 g/㎤ 
     (3) 경도 ×크림프수 ≥520 
     본 발명의 패키지는 양호한 권취패키지 형상을 유지하며 해서성이 좋으므로, 고품질의 편물지나 직물을 얻을 수 있다.
Patent KR-20010102570-A (KR)
IPC: A61P9/00
Filed: 2000-04-01
Abstract: 본 발명은 화학식 1의 화합물: 
     [화학식 1] 
     
       
     
     (상기 식에서, 
     R 1 , R 2 , R 3 , m 및 n은 청구항 1에서와 같이 정의됨) 
     및 이의 생리학적으로 허용가능한 염 및 용매화합물에 관한 것이다. 본 발명의 물질은 심혈관질환, 혈전증, 심근경색, 관상 심장질환, 동맥경화증, 골다공증의 예방 및 치료, 혈관생성에 의해 유발되거나 증식되는 병리학적 상태 및 종양치료에서 인테그린-저해물질로서 사용된다.
Patent KR-20010108391-A (KR)
IPC: H05K3/00
Filed: 2000-03-23
Abstract: 본 발명은 다층 인쇄회로기판의 제조방법에 대해 기술되어 있다.  우선, 캐리어 호일(10)이 적층된 기능성 구리 호일(16)을 포함하는 복합 호일(10)을 중심 보드(20)에 적층시킨다.  상기 기능 구리 호일(16)은 두께가 10 ㎛ 미만이고, 측면은 캐리어 호일(12)과 접하고, 후면은 레진(18)으로 코팅되어 있다.  이어서, 상기 캐리어 호일(12)은 기능 구리 호일(16)의 측면을 노출시키기 위하여 상기 기능 구리 호일(16)로부터 제거한다  이어서, 미세바이어스(microvia)를 형성하기 위하여 CO 2 레이저원을 사용하여 상기 기능 구리 호일(16) 및 레진(18) 전체를 천공시킨다.  또한 본 발명은 다층 인쇄회로기판의 제조시 이용되는 4개의 다른 층으로 이루어진 복합 호일(10)에 대해 기술되어 있다.
Patent KR-20020026417-A (KR)
Title: 필터의 완전성 테스트시스템을 구비한 물 분배 장치
IPC: B01D61/18
Filed: 2000-04-03
Abstract: 물 콘테이너, 인입구와 분배 인출구를 구비한 필터 하우징내에 포함된 필터 소자, 상기 콘테이너로부터 상기 필터 하우징 인입구로 물을 공급하는 압력원(source)과 제1밸브와 제1도관수단, 필터 하우징 인입구에서 가스 압력이 나오도록 상기 인입구로 가스를 공급하는 수단을 포함하는 물 분배기는, 저수 탱크, 상기 저수 탱크의 물의 레벨을 제어하는 제2밸브와 도관수단과, 상기 저수탱크로의 물의 유입을 하도록 하거나 방지하는 제3도관과 밸브수단으로 이루어진 제어수단, 필터 인입구의 압력을 모니터하는 압력게이지 및 가스 공급을 하거나 중지하는 가스 공급수단을 제어하는 제어수단으로 이루어진다. 압력원은 실린더로부터 물 콘테이너로 압축된 가스의 유입을 제어하는 밸브와 도관수단이 구비된 압축된 가스 실린더이고, 필터 인입구에 가스를 공급하는 수단은 가스를 직접 가스 실린더로부터 인입구로 공급하는 도관과 밸브수단을 포함한다.
Patent KR-20020005003-A (KR)
Title: 도관 운반 체인
IPC: H02G11/00
Filed: 2000-04-13
Abstract: 본 발명은 분절식으로 서로 연결된 체인 링크로 구성되는 도관 운반 체인에 관한 것으로,  이 체인 링크는 정면에서 개방되고 1 이상의 횡단 웨브에 의해 연결된 2 개의 측면부재를 포함한다.     체인 링크는 정면에 인접한 영역에서 연결 수단을 구비한다.     상기 연결 수단은 체인의 종방향에 대하여 십자형으로 신장된 축 주위로 체인 링크에 분절식으로 연결하기 위해서 사용되고,  상기 체인 링크는 정면에 인접하게 된다.     본 발명의 목적은 체인의 내부 위치한 선의 삽입을 간단하게 하고 선으로의 접근을 향상시키는 것이다.     결국,  1 이상의 체인 링크 (1) 가 제공되고 측면부재 (5, 6) 는 대략 중심에 배열된 횡단 웨브 (중심 웨브 (13)) 에 의해서 연결된다.     측면부재 (5, 6) 는 내부에 횡단 웨브 (외부 웨브 (17)) 를 구비한다.     상기 웨브는 개방될 수 있다.
Patent KR-20020031103-A (KR)
IPC: H03M7/30
Filed: 2001-04-10
Abstract: 압축 대상의 부호있는 디지털 데이터에 오프세트값을 부가함으로써 부호없는 디지털 데이터에 변환하는 오프세트 부가부(3)와 상기 부호없는 디지털 데이터에 대해서 하위 수비트의 반올림 연산을 행함으로써, 1워드 당의 비트 수를 삭감하는 반올림 연산부(5)와 상기 반올림 연산이 가해진 디지털 데이터를 그 미분값의 극성이 변화하는 점의 시간 간격에서 표본화하여서 각 표본점에 있어서의 이산적인 진폭 데이터값과 각 표본점간의 시간 간격을 나타내는 타이밍 데이터값의 조를 압축 데이터로서 얻는 타이밍 신서사이저(6) 및 압축 처리부(7)를 설치하여, 시간축 상의 신호를 압축·압축 해제할 때에 주파수 변환을 행하지 않고 시간축 상에 그대로 처리할 수 있도록 한다.
Patent KR-20020026881-A (KR)
IPC: C08G63/06
Filed: 2001-04-16
Abstract: A liquid crystal polyester resin composition which suppresses the formation of a blister caused by a heat treatment at a high temperature and has excellent moldability. This composition comprises (A) a liquid crystal polyester comprising at least two aromatic oxycarbonyl recurring units and (B) a liquid crystal polyester comprising at least two aromatic oxycarbonyl recurring units, at least one aromatic dioxy recurring unit and at least one aromatic dicarbonyl recurring unit. The weight ratio of the liquid crystal polyester (A) to the liquid crystal polyester (B) is 90/10 to 30/70.
Patent KR-20030060032-A (KR)
Inventor: CHOI GWI JIN
IPC: F24F13/22
Filed: 2002-01-05
Abstract: PURPOSE: A structure for guiding condensate of a baffle for an indoor unit of an air conditioner is provided to prevent damage of an equipment or short-circuit due to leakage of condensate to the equipment other than a drain member in the indoor unit. CONSTITUTION: A guide pin(81) is protrusively formed on a lower plane of a baffle to guide condensate so that condensate formed on the plane of the baffle is guided to a drain member(90) and drops down. The guide pin is formed on a lower end of the baffle, crosses the stepped plane of the baffle, and is inclined inwardly to a heat exchanger(70). The guide pin is extended on the stepped plane of the baffle to guide condensate from an uppermost plane of the stepped baffle to a lowermost plane of the baffle horizontal with a plane of the heat exchanger. Condensed water formed on the baffle drops down along the plane of the baffle, is collected by the guide pin slopingly and protrusively formed on the lowermost end of the baffle, and moved toward the heat exchanger along inclination of the guide pin. The condensate drops down to the drain member together with condensate formed on the heat exchanger to be collected.
Patent KR-20030065219-A (KR)
Title: Apparatus for driving lamp and liquid crystal display with the same
Inventor: HAN SONG I
IPC: H05B41/282
Filed: 2002-01-31
Abstract: PURPOSE: A device for driving lamps and a liquid crystal display having the same are provided to prevent the lifespan of the lamps from being reduced due to current variation between the lamps when excessive current flows in a specific lamp. CONSTITUTION: A DC/DC(Direct Current to Direct Current) converter(10) converts DC voltage provided from the outside into a certain level of voltage. A DC/AC(Direct Current to Alternating Current) inverter(20) converts the converted DC voltage into AC voltage to be supplied to inputs of a plurality of lamps. A power control unit includes a plurality of lamp current sensing units(31,32,33,34) and a plurality of bypassing units(41,42,43,44). The lamp current sensing units check lamp current of the lamps through outputs of the lamps for controlling the voltage level conversion of the DC/DC converter. In the case that the checked lamp current of the lamps exceeds a threshold preliminarily set, the bypassing units bypass part of current supplied to the inputs of the lamps.
Patent KR-20030071107-A (KR)
Title: A Plasma Display Panel
Inventor: SONG MU GANG
IPC: H01J11/28
Filed: 2002-02-27
Abstract: PURPOSE: A PDP(Plasma Display Panel) is provided to be capable of reducing power consumption and increasing operation margin by partially damascening a dielectric layer. CONSTITUTION: A PDP comprises a front substrate(10) including a plurality of maintenance electrodes, wherein the maintenance electrodes are spaced apart from each other, and a rear substrate including a plurality of data electrodes, wherein each data electrode is across the maintenance electrode of the front substrate. At this time, a dielectric layer(12) is formed at the upper portion of the front substrate and a plurality of isolating walls(21) are spaced apart from each other for dividing each discharge cell between the front and rear substrate. Preferably, the maintenance electrode of the front substrate is made of a transparent electrode(11a) and a bus electrode(11b). Preferably, each discharge cell is formed at the cross point of a pair of maintenance electrodes and one data electrode, wherein the pair of maintenance electrodes are made of a scan-maintenance electrode and a common maintenance electrode, respectively. Preferably, the dielectric layer is partially damascened.
Patent KR-20030072653-A (KR)
Title: Preparation of a chromatography using polymers having small diameters
Inventor: KANG DAL SEON
IPC: B01J20/281
Filed: 2002-03-06
Abstract: PURPOSE: Provided is a method for producing a granular polymer for fillers of high performance liquid chromatography and ion chromatography column by suspension polymerization. CONSTITUTION: The method comprises the steps of (i) adding 50-95 wt% of monomer of copolymer obtained by mixing styrene-divinylbenzene, ethylvinylbenzene-divinylbenzene, styrene-divinylbenzene-acrylate or glycidylmethacrylate-divinylbenzene(the monomers are used in the same molecular ratios, respectively) in 5-8 times of dispersing solvent as total weight of the used monomers, 0.5-4 wt% of polymerization initiator, 3-50 wt% of stabilizer, and 0.001-0.02 wt% of adjuvant stabilizer, (ii) rapidly stirring the monomers at 10,000-20,000 RPM until polymerization reaches to 5-50 wt% based on total weight of synthesized polymer, and (iii) adding 0.001-1 wt% of stabilizer to the reaction product of the step(ii) in 3-4 portions at 1-60 min. intervals while slowly stirring at 400-700 RPM, so as to suspension polymerize the mixture, thereby synthesizing fine globular, granular poly(styrene-polydivinyl benzene) copolymer, poly(ethylene vinyl benzene)-poly(divinylbenzene) copolymer, poly(styrene)-poly(divinylbenzene)-poly(acrylate) copolymer, or poly(glycidyl methacrylate)-poly(divinylbenzene) copolymer having particle size of 1-110 micrometer.
Patent KR-20030073725-A (KR)
Title: Nacre coating method of the cinerary urn and products
Inventor: SONG JAE WON
IPC: A61G17/08
Filed: 2002-03-13
Abstract: PURPOSE: A yellow soil ashes box and a method for attaching mother-of-pearl to the same are provided to constantly maintain adhesive force between the yellow soil ashes box and mother-of-pearl. CONSTITUTION: A curing layer is formed on a yellow soil ashes box by attaching a curing agent including a reinforcing member to a surface of the yellow soil ashes box and the surface of the yellow soil ashes box is evenly polished(100). Then, a lacquer layer is formed on the polishing surface by varnishing the polishing surface with lacquer at least one time(200). After evenly polishing the surface of the lacquer layer, an adhesive layer is coated on the polishing surface of the lacquer layer(300). Finally, heat is applied to mother-of-pearl so as to attach mother-of-pearl to the adhesive layer(400).
Patent KR-20030075248-A (KR)
Title: Dimming system of the discharge lamp for energy saving
Inventor: JUNG DONG YEOL
IPC: H05B41/392
Filed: 2002-03-18
Abstract: PURPOSE: An energy saving type illuminance controller is provided to maximize the energy saving efficiency and minimize noise elements by improving a structure of an illuminance controller. CONSTITUTION: An energy saving type illuminance controller includes the first switching portion, the second switching portion(60), a microprocessor(110), a switch driving portion(130), and a low pass filter(70). The first switching portion is connected to a power supply line. The second switching portion(60) is connected between the power supply line and an output terminal of the first switching portion. The microprocessor(110) generates a square wave pulse having a duty cycle according to an illuminance control command. The switch driving portion(130) outputs a switching control signal to control the first switching portion and the second switching portion(60). The low pass filter(70) removes the ripple content from the voltage.
Patent KR-20030080331-A (KR)
Title: operating method of character certification system using portable flash memory
Inventor: LEE SANG HUN
IPC: G06F15/00
Filed: 2002-04-08
Abstract: PURPOSE: A method for operating an ID system using a portable flash memory is provided to log in to a server safely and certainly through the fingerprint recognition and the digital certification key confirmation by storing the fingerprint data and a digital certification key of a user in the portable flash memory. CONSTITUTION: The user stores the fingerprint data and the digital certification key in the flash memory(S1). The user inserts the flash memory into a bio flash terminal linked with a server when the user connects to the server through a PC(S2). A fingerprint of the user is scanned by contacting a finger to a fingerprint reader of the bio flash terminal and is converted into the fingerprint data(S3). The PC compares the fingerprint data with the fingerprint data previously stored in the flash memory(S4). If both fingerprint data are matched, the PC is logged in to the server by driving the digital certification key in the flash memory.
Patent KR-20030083214-A (KR)
Title: Hig-rate deposition of organic polymer-like thin films with high corrosion resistance
Inventor: BOO JIN HYO
IPC: H01L21/205
Filed: 2002-04-19
Abstract: PURPOSE: A method for speedily manufacturing an organic polymer thin film with high corrosion resistance is provided to be capable of considerably improving the corrosion resistance of metal by carrying out a plasma sub-CVD(Chemical Vapor Deposition) process using organic material such as C4H4S and C7H8 as the source material of a low dielectric polymer thin film. CONSTITUTION: A polymer thin film depositing process is carried out by using a plasma sub-CVD method. One organic material selected from a group consisting of C4H4S, C7H8, cyclohexane, methyl cyclohexane, ethyl cyclohexane, or xylene, is used as depositing source material. At this time, the RF(Radio Frequency) power of 20-100 Watt, is used.
Patent KR-20020096873-A (KR)
Title: A semiconductor integrated circuit device and a method of manufacturing the same
Inventor: KAZAMA HIDETO
IPC: H01L27/11
Filed: 2002-05-09
Abstract: PURPOSE: To enhance the performance of a semiconductor integrated-circuit device in which a storage internode capacitance for an SRAM and an element comprising an analog capacitance are formed on a single substrate. CONSTITUTION: A plug P1 is formed on a silicon oxide film 21 on a pair of n-channel MISFETs in the memory formation region (SRAM), a local interconnection LIc (MOc) which connects respective gate electrodes to respective drains of the pair of n-channel MISFETs is formed in the upper part of the film 21 and the plug P1, and a capacitance insulating film 23 and an upper electrode 24 are formed in its upper part. Alternatively, a local interconnection ILc (MOc), a capacitance insulating film 23 and an upper electrode 24 are formed on a silicon oxide film 21 and a plug P1 in the film in an analog capacitance formation region (analog capacitor) in the same process as the local interconnection, the capacitance insulating film and the upper electrode which are formed in the memory cell formation region.
Patent KR-20030088606-A (KR)
Inventor: YOON YEO JUN
IPC: B63B35/81
Filed: 2002-05-13
Abstract: PURPOSE: A water skate is provided to enable a user to easily keep the balance in skating by connecting a support frame to the bottom of a vertical wing. CONSTITUTION: A water skate is composed of a support frame including a shoe supporter(102) and front/rear supporters(101,103), a vertical wing(107), and a crossbar(105) and a hub(106) installed at the bottom of the vertical wing. The vertical wing has steering and lifting function. The support frame is connected to the bottom of the vertical wing. The cross bar is connected to the front/rear supporters by a wing nut(104).
Patent KR-20030088612-A (KR)
Title: Web-dialing method
Inventor: LEE JONG HUN
IPC: G06F17/00
Filed: 2002-05-13
Abstract: PURPOSE: A web dialing method is provided to automatically connect a telephone by finding out and activating a telephone number on a web document, and dialing the telephone number through a current telephone or an Internet phone service network. CONSTITUTION: The telephone number is recognized from a web page. The recognized telephone number is activated(S200). The activated telephone number is clicked by a mouse. A user selects the connection of the current telephone or the Internet phone service network(S201). If the telephone is completed or is not called, the storage of the telephone number is asked. The telephone number is stored(S205).
Patent KR-20020087366-A (KR)
Inventor: HAYASAKI KEI
IPC: B05D3/10
Filed: 2002-05-14
Abstract: PURPOSE: To prevent defects during the development of a resist film and the dimensional differences in a sparse and dense pattern. CONSTITUTION: A developer, in which gaseous molecules having oxidizing or reducing property are dissolved, is supplied from a developer supply nozzle 111 to a substrate 100 to be treated, on which surface an exposed photosensitive resist film is formed to develop the photosensitive resist film. Consequently, in-plane distribution of affinity between the resist film and a product is prevented, and the differences in development speeds that occur locally during developing are reduced. Furthermore, the reaction products are diffused rapidly into the developer, and sparse and dense dimension differences caused by differences in alkali concentrations are reduced.
Patent KR-20030090948-A (KR)
Title: Cylindrical stocker robot used in semiconductor manufacturing processes
Inventor: AHN SEUNG UK
IPC: B25J9/04
Filed: 2002-05-24
Abstract: PURPOSE: A circular stoker robot used in a semiconductor fabrication process is provided to quickly load a wafer cassette at a desired place by freely rotating the y-axis of the robot and the wafer cassette. CONSTITUTION: A cylindrical body(103) is mounted at the bottom of a main body(100). A semicylindrical guide unit(101) is integrally formed at the top of the cylindrical body. A support unit(110) is located at the lower part of the cylindrical body, and supports the main body rotatably. Two guide belts are rotatably mounted at both sides of the semicylindrical guide unit. A lift(130) is connected to the guide belts, and moves up/down in the semicylindrical guide unit. A cassette suspending unit(150) is rotatably mounted at one end of a rotary arm(140) connected to the lift.
Patent KR-20030091268-A (KR)
Inventor: HA CHE UNG
IPC: H02H3/26
Filed: 2002-05-27
Abstract: PURPOSE: A display device of sheath circulating current for underground transmission cable is provided to protect an underground transmission system from the over-current by installing a current transformer at a cable sheath of the underground transmission cable. CONSTITUTION: A display device of sheath circulating current includes a current transformer, an input portion(2), a gain control portion(3), a low pass filter portion(4), a sample/hold portion(5), a multiplexer(6), an analog/digital converter portion(7), and a digital signal processing portion(8). The current transformer converts the primary current of a cable sheath(11) of an underground transmission cable to a sheath circulating current signal. The input portion(2) receives the sheath circulating current signal. The gain control portion(3) control a gain of the sheath circulating current signal and amplifies the controlled sheath circulating current signal. The low pass filter portion(4) filters the amplified sheath circulating current signal by using a sheath circulating current signal band. The sample/hold portion(5) samples the filtered sheath circulating current signal band. The multiplexer(6) outputs selectively the sampled sheath circulating current signal band. The analog/digital converter portion(7) converts the sheath circulating current signal band of the multiplexer(6) to a digital signal. The digital signal processing portion(8) calculates an effective value of the digital signal and transmits an operating signal to a circuit breaker of the effective value is more than the reference value.
Patent KR-20020092822-A (KR)
Inventor: ISHIYAMA HISANOBU
IPC: H03F3/30
Filed: 2002-06-04
Abstract: PURPOSE: To provide an operational amplifier circuit capable of lowering the power consumption of an optoelectronic device with simple circuit constitution and a driving circuit, and to provide a driving method using the operational amplifier circuit. CONSTITUTION: In a period T1 (positive pole) when a counter electrode VCOM becomes to be at VC1, a data line is driven with a P type operational amplifier OP1 having a P type driving transistor and in a period T2 (negative pole) when the VCOM becomes to be at VC2, the data line is driven with an N type operational amplifier OP2 having an N type driving transistor. Outputs of selection circuits of the operational amplifiers OP1, OP2 are set to be in high impedance state at the time of changing over the VCOM. At the time of the drive of the operational amplifier OP1, the current of the current source of the operational amplifier OP2 is turned OFF, and at the time of the drive of the operational amplifier OP2, the current of the current source of the OP1 is turned OFF. Moreover, in a period prior to the drive of the operational amplifiers OP1, OP2, driving transistors of the OP1, OP2 are turned OFF. The voltage level of the data line is changed before the drive by utilizing positively the parasitic capacitance between the counter electrode and the data line.