baber/WOPTO huggingface dataset:
Patent KR-19990080734-A (KR)
Title: 이중 절첩 마스크 및 제조방법
Filed: 1998-04-21
Abstract: 본 발명은 기재의 상하부에 상하부 테두리부를 형성한 마스크에서, 코에 대응하는 공간을 이루도록 마스크 기재 중앙 상부의 수평선을 기준으로 위로 절첩한 상부 절첩 공간부와, 입 및 턱에 대응하는 공간을 이루도록 마스크 기재의 중앙 하부를 기준으로 아래로 절첩한 하부 절첩 공간부로 이루어지고; 
     상기 상하부 절첩 공간부는 상하부 테두리부에 대응하는 부위의 길이가 짧은 사다리꼴을 각각 이루도록 형성함을 특징으로하는 이중 절첩 마스크 및 제조방법에 관한 것으로, 
     마스크 기재의 중앙부 상하의 수평선 부위를 기초로 절첩 공간부의 끝 부분을 절첩하여 상하부 테두리부에 일치토록 하므로 상대적으로 마스크의 폭이 줄어들어 포장 및 보관이 용이하다. 또한 코 부위와 입 및 턱 부위에 일정한 공간을 이루도록 제공하므로 사용자가 코 및 입 부위의 압박을 덜받는 상태로 편리하게 사용 가능하다.
Patent KR-19980081773-A (KR)
Title: 자기 기록/재생 장치의 ｃｕｅ 신호 검출회로
IPC: G11B15/087
Filed: 1998-04-27
Abstract: 본 발명은  자기테이프 (101, 101) 에 기록되어 있는 재생 콘트롤 신호를 판독하는  CTL 헤드 (11) 와,  그 재생 콘트롤 신호를  디지털신호로 변환하는  아날로그회로 (12) 와,  디지털신호를  상기 신호의 듀티비에 따른  아날로그전압으로 변환하는  필터부 (13) 와,  캡스턴모터 (101 및 102) 의 동작에 따라  타이밍신호를 생성하는 분주회로 (14) 와,  타이밍신호에 따라  아날로그전압으로 변환된 재생 콘트롤 신호의 전압치를 받아들여,  받아들인 전압치에 근거하여  재생 콘트롤 신호 중에서 CUE 신호를 검출하는  아날로그/디지털 변환회로 (15)  및  판정회로 (16) 를  구비하는  CUE 신호 검출회로에  관한 것이다.
Patent KR-19990085681-A (KR)
Title: 다마신 공정에 의한 반도체 장치의 배선 형성방법
Filed: 1998-05-20
Abstract: 다마신 공정에 의한 반도체 장치의 배선 형성 방법에 관하여 개시한다. 본 발명에서는 전도층이 형성되어 있는 반도체 기판상에 상기 전도층을 덮는 평탄화된 제1 층간절연막을 형성하는 단계와, 상기 평탄화된 층간절연막 위에 식각 저지용 층간절연막을 형성하는 단계와, 상기 식각 저지용 층간절연막 위에 평탄화된 제2 층간절연막을 형성하는 단계와, 상기 평탄화된 제2 층간절연막을 식각하여 홈을 형성하는 단계와, 다마신 공정에 의하여 상기 홈 내에 배선층을 형성하는 단계를 포함하는 것을 특징으로 하는 반도체 장치의 배선 형성 방법을 제공한다.
Patent KR-19990013376-A (KR)
Title: 가용성 음료 분말
IPC: A23L2/39
Filed: 1998-05-23
Abstract: 본 발명은 물에 녹였을 때 소량의 크림을 함유한 커피 드링크를 모방한 음료를 제공하는 가용성 음료 분말에 관한 것으로서, 이 가용성 음료 분말은 가용성 커피 분말과, 가용성 크리머를 함유한 분말로 만들어진다. 크리머를 함유한 분말은 미리 응집된 크리머 고형체와 적어도 약 10 중량 %의 가용성 커피 고형체를 함유한다. 가용성 크리머를 함유한 분말은 가용성 커피 분말의 색깔과 유사하여 가용성 음료 분말은 상당히 균질한 색깔을 갖는다. 가용성 음료 분말은 가용성 커피의 총 함유량이 적어도 25 중량 % 이다.
Patent KR-20000000723-A (KR)
Title: Softer handoff method within cellular mobile telecommunication system
Inventor: KIM WAN HO
IPC: H04W36/20
Filed: 1998-06-03
Abstract: PURPOSE: A softer handoff method within cellular mobile telecommunication system is provided to transmit in a new added sector when a softer swap handoff is generated, and to stop an excluded sector after performing handoff for a mobile terminal. CONSTITUTION: The method is performed by a base station controller(21) in a code division multiple access system. According to the method, a mobile terminal(41) reports new activating collection to the base station controller(21). According to the new activating collection, the base station controller(21) determines to exclude the first sector of prior collection, and to add the second sector of prior collection. The base station controller(21) commands a base station(31) to start transmission to the second sector. The base station controller(21) commands the mobile terminal(41) to exclude the first sector of prior collection, and to add the second sector of prior collection. The mobile terminal(41) performs a handoff procedure to exclude the first sector of prior collection, and to add the second sector of prior collection. When the mobile terminal(41) reports the handoff ending to the base station controller(21), the base station controller(21) commands the base station(31) to stop transmission to the first sector.
Patent KR-19990006664-A (KR)
Title: 다수의 통신제어를 수행할 수 있는 통신데이터 터미널과 그 방법
IPC: H04N1/32
Filed: 1998-06-03
Abstract: 다수의 통신제어를 수행할 수 있는 통신데이터 단말장치는 V.8과 V.34 절차를 포함하는 통신기능을 수행하는 첫 번째 통신제어기, 첫 번째 통신제어기의 데이터 신호비보다 느린 데이터 신호비를 갖는 모뎀기능을 수행하는 두 번째 통신제어기, 송신 모드동안 CM 신호를 또는 콜 수신모드동안 JM 신호를 송신하는 타이밍에서 소정의 시간을 카운트하는 타이머, 소정의 시간내에 첫 번째 통신제어기가 상기 JM 신호를 수신하는지 여부의 결정을 수행하고 콜링 모드동안 소정의 시간내에 JM 신호를 수신하지 못하는 경우 CM 신호의 송신을 중단하고 DIS 신호를 수신하며, 소정의 시간내에 첫 번째 통신제어기가 CJ 신호를 수신하는지 여부의 결정을 수행하고 콜 수신 모드동안 두 번째 결정의 결과로 소정의 시간내에 CJ 신호를 수신하지 못하는 경우 JM 신호의 송신을 중단하고 DIS신호를 송신하는 시스템 제어기를 포함한다.
Patent KR-20000002735-A (KR)
Title: Cooling device of vegetable storing room of refrigerator
Inventor: KIM EUN JUNG
IPC: F25D25/00
Filed: 1998-06-23
Abstract: PURPOSE: A cooling device of a vegetable storing room of a refrigerator is provided to keep freshness of vegetables for a long time by indirectly cooling the vegetables within the vegetable storing room. CONSTITUTION: A refrigerator containing a vegetable storing room for storing vegetables comprises:a hole(10b) for discharging the cold air in a cold chamber to the vegetable storing room(11); a cooling member in the vegetable storing room for venting the cold air to be discharged through the hole by leading to the outside wall(11a) of the vegetable storing room.
Patent KR-19990036544-A (KR)
Title: 왕복식 전기 면도기
IPC: B26B19/04
Filed: 1998-06-30
Abstract: 본 발명의 목적은 트리머 날과 면도날을 연속해서 편리하게 이용할 수 있고, 또 트리머의 구조를 간단하게 해서 본체의 부품 갯수를 삭감해서 소형화할 수 있는 왕복식 전기 면도기를 제공하는 데에 있다.  이러한 목적을 달성하기 위해, 본 발명은 본체와 헤드부로 이루어진 왕복식 전기 면도기에 있어서, 헤드부에 마무리 면도용 날과 거친 면도용 날을 병렬로 구비하고, 거친 면도용 날은 상면벽(73)과 편측벽(74)으로 이루어진 역 L자형 단면으로 절곡한 상부 고정 날(71)과, 상부 고정 날(71)의 내면에 미끄럼 접촉하는 하부 가동 날(72)을 구비하고, 상기 상부 고정 날(71)의 상면벽(73)에 2열의 날 부분을 형성해서, 한쪽 열의 날 부분에 상면벽(73)의 중앙부로부터 편측벽(74)으로 걸쳐진 곱슬 수염 슬릿 구멍(75)을 형성하고, 다른 쪽 열의 날 부분에 상면벽(73)의 중앙으로부터 선단으로 향하는 트리머 날(76)을 형성한다.
Patent KR-20000007454-A (KR)
Title: Bit error rate improving and burst synchronizing method using fec when combining asynchronous transfer mode network with satellite network
Inventor: KANG SIN HA
IPC: H04L12/28
Filed: 1998-07-03
Abstract: PURPOSE: A burst synchronizing method is provided to improve the performance of a system demanding for a high-speed service such as a multimedia service by quickly obtaining the TDMA synchronization. CONSTITUTION: The burst synchronizing method comprises the steps of: correcting a single bit error by using HEC within the header of an ATM cell at the transmitting terminal of an ATM network (10) and detecting a multi bit error; inserting the FEC into the place where the HEC is removed; transmitting the ATM cell newly made by inserting the FEC onto a wireless transmitting route through a satellite(22); receiving the ATM cell in the receiving terminal of remote stations(23,24); performing the bit error correction and detection by using the FEC within the header of the ATM cell.
Patent KR-20000013130-A (KR)
Title: Exhaust device of burlap-bag manufacturing machine for agricultural products
Inventor: YOU HO JOON
IPC: B31B21/00
Filed: 1998-08-01
Abstract: PURPOSE: An exhaust device of a burlap-bag manufacturing machine for agricultural products is provided to safely work when releasing a burlap bag, to increase the speed of the work and to exactly release and laminate bags. CONSTITUTION: The exhaust device(1) of a burlap-bag manufacturing machine for agricultural products is composed of:two side plates(3) placed on the end part of a release conveyer(2); four chain gears(12)(12')(13)(13') installed on two shafts(11)(11') to get two chains(10)(10') revolved to the same direction as the transfer direction of a burlap bag(50) driven by the power of a motor(4); a supportive plate(20) installed to help the burlap bag(50) be laid and transported on the lower area of the exhaust conveyer(2) of the chains(10)(10'); plural needle paths(21) provided on the supporting plate(20) along the position where a transfer needle(18) passes; and a stopper aperture(22) formed in the center of the needle path(21).
Patent KR-20000013373-A (KR)
Title: Compression molding device for glass product of cathode tube and control method for above compression molding device
Inventor: NAM SEUNG GIL
IPC: C03B11/10
Filed: 1998-08-07
Abstract: PURPOSE: A compression molding device for glass products for cathode tube enhances optical characteristics and physical properties of formed glass products and enables easy setting of compression parameters such as pressure of a plunger for compression molding. CONSTITUTION: A compression molding device for glass products for cathode tubes comprises a bottom mold(1) receiving melt glass gob, a withdraw site for withdrawal from the bottom mold, and a plunger moving up and down between pressure sites for molding the glass gob with a charging distance of the glass gob from the bottom mold, a control method for the compression molding device comprising the steps of:causing the plunger(7) to descend to contact press the glass gob received in the bottom mold and increase the pressure on the plunger to a first pressure; maintaining the first pressure for a defined time period; and reducing the first pressure to a second pressure.
Patent KR-19990023664-A (KR)
Title: 가압용기의 언로딩 장치
IPC: B01J8/00
Filed: 1998-08-18
Abstract: 일련적으로 최소한 두개의 회전 공급장치, 반응기와 제일 공급장치 사이에 위치하는 밸브와 이 밸브와 반응기 사이에 위치하는 가스용 유입 포인트를 포함하는 가압용기를 언로딩하는 장치.
Patent KR-20000014201-A (KR)
Title: Washing and rinsing control method for centrifugal permeate washing machine
Inventor: KIM JI MAENG
IPC: D06F33/02
Filed: 1998-08-18
Abstract: PURPOSE: A washing and rinsing control method for a centrifugal permeating washing machine is provided to obtain the excellent washing efficiency, to repress the twist of the washing and the damage of the washing, and to devise the save of the washing water and of the amount of the detergent input. CONSTITUTION: The centrifugal washing and dehydrating process is operated to supply the washing water into an inner washing tub again by pumping upper the inner washing tub by the centrifugal force by right and reverse rotating the inner washing tub in high speed when the water level is low at washing or at dehydrating. The detergent and the washing water is saved, and the damage of the washing and the twist of the washing at washing is prevented by operating the centrifugal transmitting washing and dehydrating process to supply the washing water into the inner washing tub again by pumping upper the inner washing tub by the centrifugal force by right and reverse rotating the inner washing tub in low speed when the water level is high at washing or at dehydrating.
Patent KR-20000014502-A (KR)
Title: Glyceraldehyde-3-phosphate dehydrogenase promoter gene derived from pichia ciferrii and a process for manufacturing taps using thereof
Inventor: LEE SANG GI
IPC: C12N15/67
Filed: 1998-08-21
Abstract: PURPOSE: Glyceraldehyde-3-phsphate dehydrogenase (GAPDH) promoter gene isolated from GAPDH gene coding glyceraldehyde-3-phsphate dehydrogenase derived from pichia ciferrii is able to increase yield of tetraacetyl phytosphingosine(TAPS) by amplifying LCB2 gene. CONSTITUTION: Tetraacetyl phytosphingosine(TAPS) is produced by cultivating transformant pichia ciferrii transformed with plasmid containing ribosome DNA derived from pichia ciferrii, CYH gene with resistance to antibiotic cycloheximide, glyceraldehyde-3-phsphate dehydrogenase(GAPDH) promoter gene, LCB2 gene coding serine palmitoyl transferase derived from pichia ciferrii and by extracting tetraacetyl phytosphingosine from culture media.
Patent KR-20000014791-A (KR)
Title: Recording day selecting method at the time of setting up pre-booked recording of a vcr
Inventor: KIM CHANG-JIN
IPC: H04N5/76
Filed: 1998-08-25
Abstract: PURPOSE: A recording day selecting method is provided to allow users record a program on a wanted day regardless of a region and country by allowing the user to input the wanted recording day directly as the recording day selecting screen is provided separately. CONSTITUTION: The method comprises a step of determining whether the main menu selection button of the VCR remote control is applied by a user or not(100); a step of displaying the main menu screen through the OSD managing part when the main menu selection button is applied(101); a step of determining whether the pre-booked recording item among the main menu items is selected or not(102); and a step of displaying the separate recording/weekly recording/daily recording selection screen(103). The method further comprises a step of determining whether the daily recording item is selected or not(104); a step of displaying daily recording set up screen by controlling the OSD managing part(105); a step of determining whether the input of set up data is finished by a user or not(110); and a step of recording the pre-booked program during the set time and on the set up date(111).
Patent KR-20000015631-A (KR)
Title: External synchronous source connecting apparatus of a clock generator
Inventor: PARK SANG GI
IPC: H03K5/00
Filed: 1998-08-31
Abstract: PURPOSE: An external synchronous source connecting apparatus of a clock generator is provided to be capable of using adaptively according to a manner of an externally received clock. CONSTITUTION: In an external synchronous source connecting apparatus of a clock generator, a board comprising a clock branching portion has a first socket at which the clock branching portion(200) is capable of being mounted and dismounted. The clock branching portion(200) is capable of being connected to the first socket, and has a structure which is capable of connecting with an externally applied signal source. The clock branching portion selects a system clock of an operation mode among two clocks applied from the exterior of a transfer system, and outputs the selected clock to a clock generating board(100). The board has a clock connecting portion(101) and a second socket at which the clock connecting portion is capable of being mounted and dismounted. The clock connecting portion(101) is capable of being connected to the second socket, and has a structure which is capable of connecting with a signal applied from the clock branching portion. The clock connecting part receives an output from the clock branching portion to output the received signal to a clock generator(100).
Patent KR-20000018633-A (KR)
Title: Server managing module operating method and device using live power
Inventor: SEO DONG WOOK
IPC: G06F1/26
Filed: 1998-09-03
Abstract: PURPOSE: A server managing module operating method and the device is provided to operate the server managing module without time limitation even when the power of the main board is put off by using the live power which is used in a WOL speck. CONSTITUTION: The device comprises a main board, I/O processor, a memory, a CSR, a power switch, a server managing module, and a battery. The method comprises a step of using the live power in order to operate the either net controller(250) in a power off situation(S1); a step of applying the live power to a WOL(S2); a step of connecting the live power to the server managing module(200)(S3); a step of receiving the live power and the power of the main board at the server managing module(S4); a step of selecting the power of the main board(S5); and a step of selecting the live power when the power of the main board is off(S6).
Patent KR-19990029992-A (KR)
Title: 키보드장치
IPC: G06F1/20
Filed: 1998-09-21
Abstract: (과제) 종래의 키보드장치 (K) 는 발열하는 IC 부품 (33) 근방에 위치하는 지지플레이트 (21) 위에 스위치부재 (22) 를 올려놓기 때문에, IC 부품 (33) 의 발열이 지지플레이트 (21) 를 통해 스위치부재 (22) 인 시트 (23,25) 로 전도되어 이 시트 (23,25) 가 늘어나서 접점불량을 일으킨다는 문제가 있다. 
     (해결수단) 본 발명의 키보드장치는 냉각액을 내장한 냉각용 히트파이프 (H) 를 지지플레이트 (1) 와 일체로 설치한 것이기 때문에, 냉각용 히트파이프 (H) 를 큰 발열을 일으키는 IC 부품 (13) 에 근접하여 퍼스널컴퓨터 (P) 내에 설치하면, IC 부품 (13) 을 냉각할 수 있고 스위치부재 (2) 를 냉각할 수 있으므로, 시트 (3,5) 가 늘어나는 것을 억제할 수 있으며 접점불량이 없는 키보드장치를 제공할 수 있다.
Patent KR-20000021084-A (KR)
Title: Surface treating apparatus for treating sample with complex shape using plasma
Inventor: HA SAM CHEOL
IPC: H01J37/00
Filed: 1998-09-25
Abstract: PURPOSE: A surface treating apparatus is provided to uniformly distribute the gas around a sample with complex shape, thereby enhancing the surface treatment effect of the sample. CONSTITUTION: A surface treating apparatus comprises a chamber(1), a vacuum pump(5,6)for providing vacuum within the chamber, a vacuum level measurement device(7,8) for measuring a vacuum level within the chamber, a sample holder for holding the sample for surface treatment, a power supplying device(3) for supplying the bias voltage to a sample(2) and an electrode(4). The electrode has a shape corresponding to that of the sample to be surface-treated. A gap is uniformly maintained between the surface of the sample and the electrode.
Patent KR-20000024711-A (KR)
Title: Pip video decoding apparatus
Inventor: KIM JAE DONG
IPC: H04N5/45
Filed: 1998-10-01
Abstract: PURPOSE: A PIP video decoding apparatus is provided to make a circuit configuration simple by selectively decoding video signals of each channel. CONSTITUTION: In a picture in picture(PIP) video decoding apparatus, an image separating part (410) divides a main image stream and a PIP stream, and a maing image storage part(420) stores the main image divided stream. A PIP storage part(430) stores the PIP divided stream. A switch(440) switches the main image stream and the PIP stream stored in the and storage parts, respectively. An image decoding part(450) decodes the main image stream and then decodes the PIP stream, and a decoding control part(460) controls the switching part and the decoding of the image decoding part.
Patent KR-20000004857-A (KR)
Title: Record medium for storing information for a still picture, record reproducing method and device
Inventor: MUN SEONG JIN
IPC: H04N5/783
Filed: 1998-10-02
Abstract: PURPOSE: A record medium is provided to store still picture group information managing a plurality of groups of still picture of large capacity. CONSTITUTION: The record medium comprises: a first region for having plural still picture data; and a second region for having still picture group information for dividing the still picture data into plural groups and managing the divided groups, wherein the first region and the second region exist on a file, respectively; and wherein the first region further comprises audio data added to the still picture data.
Patent KR-20000025833-A (KR)
Title: Apparatus for opening button box of television
Inventor: JEONG NAK MIN
IPC: H04N5/64
Filed: 1998-10-14
Abstract: PURPOSE: An apparatus for opening a button of a TV is provided to prevent noises due to swinging of a button box and to carry out easy maintenance by positioning the apparatus on an outer periphery of the button box. CONSTITUTION: An outer case(1) connected to the box mounting groove formed on an upper surface of a television cabinet and having an elastic coupling piece(9). A guide rail(13) is protruded and a moving plate(16) is inserted into the guide rail(13) and a pinion moving part(2) is connected with a pinion(19) with an insertion of a spiral spring(18). A guide groove(20) is formed and a moving rack(23) is formed on one side of the guide groove(20) for a fixing rack(22) to be mounted. A hinges(21) are protruded and a button box(3) are formed with a coupling protrusions(26).
Patent KR-20000026391-A (KR)
Title: Inverter for preventing crane from shaking
Inventor: PARK SEON SUN
IPC: B66C13/06
Filed: 1998-10-20
Abstract: PURPOSE: An inverter is provided to prevent a material transferred by a crane from shaking. CONSTITUTION: A system comprises a remote control console(1) driving and commanding a crane, an inverter(2) preventing a crane from shaking an electromotor, an electromotor(3) transferring a cart which is driven by the inverter, and all kinds of sensors(4) such as a rope length sensor. The inverter has the dynamic model of the crane and conducts operation depending on algorithm for preventing the crane from shaking. Therefore, the inverter outputs a speed command and drives the electromotor transferring the cart by a power converting module(25).
Patent KR-20000027819-A (KR)
Title: Method for forming conductive plug used for multilayer wiring of semiconductor devices
Inventor: CHOE SEUNG BONG
IPC: H01L21/28
Filed: 1998-10-29
Abstract: PURPOSE: A conductive plug formation method is provided to reduce a thermal damage due to high temperature sputtering of Al-1%Si and a resistance of via chain by cleaning a contact hole using mixed solution of ozone and DI(deionized) water. CONSTITUTION: A contact hole is formed by etching a plurality of interlayer dielectrics(12,14,16) to expose a surface of lower wire(10). For removing a native oxide and a polymer, the resultant structure is cleaned by mixed solution of ozone and DI(deionized) water. A barrier layer(22) is formed. A first conductive material is firstly deposited to partially fill into the contact hole at room temperature, and a second conductive material is secondly deposited to entirely fill into the contact hole at high temperature, thereby forming a conductive plug.
Patent KR-20000028327-A (KR)
Title: Face type heating element removing electromagnetic wave and method for fabricating thereof
Inventor: KIM CHUL SANG
IPC: H05B3/34
Filed: 1998-10-31
Abstract: PURPOSE: A heating element can remove an electromagnetic wave harmful to a human body completely. CONSTITUTION: A face type heating element removes an electromagnetic wave by preventing the formation of a magnetic field generated by a current flow at a heating line and an input terminal of the face type heating element. The face type heating element includes: a top input terminal(1) and a bottom input terminal(3) which are separated at a fixed interval on the top and bottom respectively and where currents flow in opposite direction respectively; a first heating line(5) which is connected to the top input terminal at a fixed interval and has a current flow in the same direction as the top input terminal; and a second heating line(7) which is connected to the bottom input terminal at a fixed interval and has a current flow in a direction opposite to the first heating line.
Patent KR-20000031364-A (KR)
Title: Semiconductor memory cell and fabrication method thereof
Inventor: LEE YONG GEUN
IPC: H01L27/108
Filed: 1998-11-05
Abstract: PURPOSE: A semiconductor memory cell is provided to form four memory cell transistors on one bit line and to form four memory cell transistors on one word line. CONSTITUTION: A DRAM memory cell is composed of a semiconductor substrate, a word line(32), a first ILD layer having a first contact hole(37), plural capacitors formed on the first ILD layer, a second ILD layer having a second contact hole, and a bit line(38). Herein, the semiconductor substrate is defined as first, second, third, and fourth active areas, and the word line is formed in a line shaped second pattern while being partially contacted to a first pattern. Then, the bit line is formed by connecting to the second contact hole while being perpendicular to the second pattern of the word line. Threshold voltages in the first to the fourth active areas are different from one another to form four memory cell transistors in one word line. Moreover, the four memory cell transistors are formed in one bit line to improve the integration of the device.
Patent KR-20000032630-A (KR)
Title: Red tide eliminating composition and therapeutic composition for ectoparasitic diseases of fish using alginate polygalacturonite oligomer derivative
Inventor: JANG MAN
IPC: A61K31/70
Filed: 1998-11-13
Abstract: PURPOSE: A red tide eliminating composition and therapeutic composition for ectoparasitic diseases and ectobacterial diseases of fish containing alginate polygalacturonite oligomer derivative are provided by controlling the physiological properties of alginate. CONSTITUTION: An alginate polygalacturonite oligomer derivative is prepared by hydrolysis of alginic acid extracted from seaweed such as kelp and the methods of hydrolysis can be one of the followings: 1) alginic acid is put into the acidic/alkalic solution of 20-100°C, then stirred for hydrolysis; or 2) alginic acid is hydrolyzed by using alginase at pH 8-10. The alginate polygalacturonite oligomer derivative produced by hydrolyzing alginic acid having average molecular weight of no more than 8000 dalton, can be used as red tide eliminating composition, antibacterial agent against fish pathogen or therapeutic composition for ectoparasitic diseases of fish. The content of the alginate polygalacturonite oligomer derivative in the mixture needs to be no less than 60 %.