baber/WOPTO huggingface dataset:
Patent KR-20000007632-A (KR)
Title: Liquid crystal display and method for manufacturing thereof
Inventor: KIM PA
IPC: G02F1/1345
Filed: 1998-07-06
Abstract: PURPOSE: A liquid crystal display and method for manufacturing thereof is provided to equalize cell interval of a liquid crystal display and reduce destruction of a thin transistor. CONSTITUTION: The liquid crystal display comprises two isolation substrates arranged in parallel, a bond portion formed between the isolation substrates according to a circumference of the isolation substrates, and a first and second high polymer pillars formed without contact each other. The bond portion and the first and second high polymer pillars is constituted a same material.
Patent KR-20000008433-A (KR)
Title: Method for fabricating tungsten plug of semiconductor device
Inventor: RYU YEONG GYUN
IPC: H01L21/28
Filed: 1998-07-13
Abstract: PURPOSE: A method of forming a tungsten plug is provided to simplify process steps using low-priced slurry without metal ions in a chemical mechanical polishing process. CONSTITUTION: The method comprises the steps of forming an insulating layer on a semiconductor substrate; etching the insulating layer down to a partial top surface of the substrate to form a contact hole; forming a barrier metal layer on a surface of the contact hole and the insulating layer; forming a tungsten layer on the barrier metal layer to be buried in the contact hole in which the barrier metal layer is formed; polishing the tungsten layer and the barrier metal layer down to a top surface of the insulating layer using a chemical mechanical polishing process; oxidizing a metal layer for a plug of an outside of the contact hole to form a tungsten oxide layer; and polishing the tungsten oxide layer and the barrier metal layer.
Patent KR-20000008500-A (KR)
Title: Process for preparing high pure steel for two piece can
Inventor: YOON WON KYU
IPC: C21C7/00
Filed: 1998-07-14
Abstract: PURPOSE: A method for high pure steel is prepared which has little non-metallic inclusion by raising temperature of melted ore utilizing heat riser. CONSTITUTION: The steel composition comprises less than 0.07 wt.% of carbon, less than 0.05 wt.% of silica, 0.10-0.40 wt.% of manganese, less than 0.03 wt.% of phosphor, less than 0.03 weight 5 of sulfur, 0.01-0.10 wt.% of soluble aluminum, less than 0.010 wt.% of nitrogen, remainder of Fe and impurities. The composition is steel-tapped with 400-500 ppm of dissolved oxygen at 1,640- 1,650°C and downstream bubbled. The melted steel is heated up to casting temperature and upstream bubbled to 0.3-0.7 cubic meter/minute for more than 5 minutes to give the steel.
Patent KR-20000008858-A (KR)
Title: Process for producing cyanine dyes
Inventor: JEONG JONG HWA
IPC: C09B67/50
Filed: 1998-07-16
Abstract: PURPOSE: A process for producing cyanine dyes represented by formula 1 are provided in which reaction time is shortened by choosing proper reacting solvent in each step and improving purification method. CONSTITUTION: The process comprises the steps of: dissolving and stirring phenylhydrazine hydrochloride (formula 2) and methyl isopropyl in acetic acid to obtain the compound (formula 3) and followed by refining by reduced pressure distillation method; dissolving the compound (formula 3) in acetonitrile, adding the compound represented by R2X and carrying out N-alkylation to obtain the compound (formula 5), followed by dissolving in water and recrystallizing; dissolving and reacting the compound (formula 5) and glutaconaldehyde-dianyl compound (formula 6) in acetic anhydride, followed by precipitating the product in potassium iodide aqueous solution, and dissolving and recrystallizing with a mixture of ethanol and methylether. In the formula, R1 is H or CH3; R2 is CH3 or n-C3H7; X is I or toxylate ( in R2X and formula 5, X is I); and n is 1 or 2.
Patent KR-20000010377-A (KR)
Title: Reverberation restraining apparatus of channel modem for satellite communication system
Inventor: LEE JONG BIN
IPC: H04B7/24
Filed: 1998-07-31
Abstract: PURPOSE: A reverberation restraining apparatus of a channel modem for a satellite communication system capable of preventing a wrong operation of the reverberation restraining apparatus due to a radiation of a reverberation estimating coefficient by deleting a direct current offset value with respect to data which is applied to the reverberation restraining apparatus and performing reverberation restraint, is provided. CONSTITUTION: The reverberation restraining apparatus of a channel modem for a satellite communication system comprising: a transmission offset level deleting section(51) for deleting a DC level offset value which is added to a sound signal inputted from a transmitter of a sender side; a sound data storage section(52) for temporarily storing the sound signal from the send offset level deleting section(51); a reverberation estimator(53) for calculating a reverberation estimating value based on the sound signal stored in the sound data storage section(52); a receiving offset level deleting section(57) for deleting a DC level offset value which is added to a sound signal inputted from a transmitter of a receiver side, and a data synthesizer(58) for synthesizing the receiving signal from the receiving offset level deleting section(57) with the reverberation estimating value from the reverberation estimator(53).
Patent KR-20000013877-A (KR)
Title: Preparation method of recombinant erythropoietin(epo) from cho cell
Inventor: PARK JANG HYUN
IPC: C12N15/19
Filed: 1998-08-14
Abstract: PURPOSE: Preparation method of mass production of biologically active EPO from recombinant plasmid in CHO(chinese hamster ovary) cell is provided. CONSTITUTION: The invention is disclosed a mass production method from recombinant plasmid pDEP-173 consisted of zeocin resistance gene, EPO gene, isolated from human fetal liver cDNA library, under control of SRα promoter, AmvRNA4 enhancer, DHFR gene, and BGH polyadenylation signal. The plasmid is transfected into CHO cell and cultured with roller bottle in serum free medium. EPO is induced with n-butyric acid or methotrexate. Overexpressed EPO is purified with hydrophobic chromatography and anion exchange chromatography. The purified EPO only having N-acetyl neuraminic acid as N-terminal end of sialic acid has molecular weight of 34,000-47,000 and shows 7-8 isomer bands in isoelectric focusing around pH 3.7-5.2.
Patent KR-19980082134-A (KR)
Title: 고순도를 갖는 결정성 수산화아파타이트의 제조방법
Filed: 1998-08-28
Abstract: 습식법을 이용하여 Ca/P 몰비가 1.67∼2.0이 되도록 수산화칼슘과 인산을 반응시킴으로써, 불순물이 적고, 입자가 미세하고 균질하며, 화학양론적 조성을 갖는 고순도의 결정성 수산화아파타이트의 제조방법이 개시되어 있다. 본 발명에 따르면, 고압반응기 내에 일정량의 증류수를 넣고 수산화칼슘을 넣어 슬러리시킨 후 Ca/P의 몰비율이 1.67∼2.0이 되도록 인산 수용액을 서서히 투입하면서 직접 반응시키고, 상기 인산 수용액을 투입 완료한 후에는 상기 고압반응기의 온도를 120∼200℃의 온도로 유지하고 1∼5시간 반응시키며, 반응후에 생성된 침전물을 여과 및 건조시켜서 수산화아파타이트를 만든다. 이와는 달리, 상기 반응후에 생성된 침전물을 투입온도가 200∼600℃인 분무 건조기를 이용하여 건조시켜서 수산화아파타이트를 제조한다. 또한, 본 발명은, 상기 반응후에 지방산 또는 금속비누를 첨가 및 교반하여 수산화아파타이트를 합성하고, 합성된 수산화아파타이트를 여과 및 건조시켜서 수산화아파타이트를 제조한다. 바람직하게는, 합성시 생성된 미세한 입자의 형태를 건조후에도 가질 수 있게 하기 위하여, 상기 합성된 수산화아파타이트를 금속비누로 코팅한다.
Patent KR-19980087631-A (KR)
Title: 자동차의 변속기
Filed: 1998-09-01
Abstract: 본 발명은 자동차의 변속기에 관한 것이다. 
     종래의 자동차변속기는 M/T와 A/T의 두종류를 대별할수 있으나 이는 운전조작시는 일일이 변속레버를 이용하여 클런치패달을 움직여야하는 결점이 있고 또한 복잡한 구성요소로 인하여 부피와 무게가 커서 차량의 전체적인 중량에 부담을 줄일뿐만 아니라 이로 인한 연비에도 많은 영향을 미치게 되었던 것이다. 
     본 발명은 이상의 문제점을 해결하고자 발명한 것으로 이의 발명요지는 변속기를 구성함에 있어 엔진축(3)에 의해 회동되는 디스크 원판(2)에 동심원상으로 분리홈(2')을 요설하여 지름이 각기 다른 다수의 변속기어(2-1)(2-2)(2-3)(2-4)(2-5)(2-R)를 형성하여 이와 직각 방향에 설치된 바퀴축(4)에 변속동력을 전달할수 있게 함에 있어 바퀴축(4)에는 다수의 기어식 제어베어링(4-1)(4-2)(4-3)(4-4)(4-5)(4-R)을 설치하여 전기한 변속기어와 맞물림되게 하되 필요로 하는 변속만 얻을수 있게 각 기어식 제어베어링의 플렌지(8)는 원주상으로 전자식에 의해 극성이 변환되는 다수의 작동구(12)를 동간격으로 배치하여 운전석에 설치된 풋시스위치의 작동으로 전자석의 극성이 바뀜에 따라 작동구가 전후진하면서 캠치차(9)를 회동시킴에 따라 다단변속이 가능게 한 것으로 이와 같이 하게 되면 구성요소와 무게를 소형화할수 있고 운전시는 일일이 클런치패달을 밟지 않고 풋시버턴의 조작으로 다단변속이 이루어질수 있게한 것이다.
Patent KR-20000020068-A (KR)
Title: Cleaning bath for cleaning wafer
Inventor: HEO DONG CHEOL
IPC: H01L21/304
Filed: 1998-09-17
Abstract: PURPOSE: A wafer cleaning bath is provided to facilitate conveyance of a wafer carrier and prohibit the damage of the wafer. CONSTITUTION: A wafer cleaning bath(30) includes a space in which a carrier(16) having a wafer (14) equipped therein is accommodated, and a transparent window(36) made of transparent material at both upper sides thereof. A light transmitting part(32) is provided on an outer surface of the transparent window and a light receiving part(34) is installed on another outer surface at a height corresponding to that of the former outer surface. Further, a protection cover(38) is provided to protect the light transmitting part and the light receiving part from chemicals or pure water. Thereby, the conveying condition of the carrier accommodated in the cleaning bath is determined from an electrical signal generated by the detection of the light emitted from the light transmitting part at the light receiving part.
Patent KR-20000021114-A (KR)
Title: Optical disk
Inventor: LEE SEUNG WON
IPC: G11B7/00
Filed: 1998-09-25
Abstract: PURPOSE: An optical disk is provided to prevent the scratch generated on the incident surface of laser beam during manufacturing or using the optical disk as well as to increase the scratch-resistant characteristic of the optical disk by forming a hard coating layer on the incident surface of laser beam for information read by spin coating, thermosetting and ultra violet hardening of the hard coating materials of organosilane or acrylate system. CONSTITUTION: A hard coating layer is formed on a poly carbonate substrate forming a record layer, a reflection layer and a protection layer. The hard coating layer is formed on the incident surface of laser beam for information record and regeneration to reduce a possibility that an error may occur.
Patent KR-19990030218-A (KR)
Title: 방전램프의 점등방법 및 점등장치
IPC: H05B41/292
Filed: 1998-09-29
Abstract: 직선상의 아크 방전을 발생시키면서 발광관 중앙부에서 봉입물이 발광관에 띠상으로 부착하여 그 부분의 투명성이 사라지는 것을 방지하고,방전램프의 긴 수명화를 실현하는 방전 램프의 점등방법 및 점등 장치를 제공한다. 
     소정의 주파수로 변화하는 전력을 수평배치시킨 방전 램프에 입력하여 아크 방전을 발생시키는 것에 의해 상기 방전 램프를 점등하는에 있어 소정의 주파수는 음향공명에 의해 상기 아크 방전을 거의 직선상으로 여기하는 주파수 이며,상기 방전램프에 입력되는 전력값을 상기 방전램프의 발광관의 단위 내용적 당 입력전력값이 상기 발광관의 형상에 의존하여 결정되는 소정의 범위에 들어가도록 설정하고 이에의해 상기 발광관의 봉입물이 발광관의 중앙부 근방의 관벽으로의 띠상의 부착을 억제한다.
Patent KR-20000024937-A (KR)
Title: Data production method when power is off unexpectedly
Inventor: KIM SUNG WOO
IPC: G06F1/30
Filed: 1998-10-02
Abstract: PURPOSE: A date production method when the power is off unexpectedly is provided to enhance quality of the product by sequentially operating or playing data which were being recorded during the normal power supply performance. CONSTITUTION: A system comprises a power part, a control part, a RAM, a system timer, an inputting part, an audio outputting part, and a speaker. A method comprises a step of inputting the reset key(S11); a step of the control part selecting the temporary storing RAM(S12); a step of testing the data stored at the temporary storing RAM(S13); and a step of outputting the signal through the RAM(S14). The method further comprises a step of initializing the operation RAM(S17); a step of carrying out the initialization of the interrupt port, input, output and each system during the time set at the timer(S18,19); a step of operating the mechanism by receiving the data of the program(S20); and a step of confirming whether it is in NG mode or the disk check mode and checking the data of the check mode if it is in the disk check mode(S21).
Patent KR-20000026705-A (KR)
Title: Method for recovering cell boundary in atm swithching system
Inventor: LEE SANG GIL
IPC: H04L12/433
Filed: 1998-10-22
Abstract: PURPOSE: A method for recovering a cell boundary in an ATM(Asynchronous transfer mode) switching system is to recover a cell boundary where an error is generated during the cell transmission from a cell slave board to a cell master board. CONSTITUTION: A method for recovering a cell boundary in an ATM switching system comprises the steps of: when a cell ready signal is activated from a cell slave board(S31) and is then applied, activating a read enable signal by a cell master board(S32) and transmitting the activated read enable signal to the cell slave board; after the cell slave board receives the read enable signal, transmitting a cell start signal and cell data to the cell master board(S33); allowing the cell master board to confirm a signal label of the cell start signal and thereby confirm whether there is not an error in the cell boundary; and when there is not an error in the cell boundary, receiving and processing a cell word from the cell slave board(S35).
Patent KR-20000026879-A (KR)
Title: Saddle type deflection member of film type for cathode ray tube and method for fabricating saddle deflection coil using thereof
Inventor: CHOI DON BIN
IPC: H01J9/236
Filed: 1998-10-23
Abstract: PURPOSE: A Saddle type deflection member of film type for cathode tube and a method for fabricating a saddle deflection coil using thereof are provided to minimize a connection part of each wire and to form the patterns of wire shape on a base film. CONSTITUTION: A Saddle type deflection member of film type(40) forms wires in pattern on a base film(40a). The connection part of each wire can be minimized because wires formed as pattern are connected as one line, not being separated additionally. In the Saddle type of film deflection member, the wire is formed in a fixed pattern in order to comprise a neck end turn unit(42), a first and a second deflection unit(43,44) and a funnel end turn unit(46) which connects the first and the second deflection part and is longer than the neck end turn part. The wire comprises connection ports(47,48) on the surface and on the back surface of the base film in order to be connected to the external.
Patent KR-20000027666-A (KR)
Title: Field effect transistor having a doped spacer and a method for manufacturing the same
Inventor: KANG WOO TAK
IPC: H01L29/772
Filed: 1998-10-29
Abstract: PURPOSE: A transistor is provided to improve the reliability of a device with solving the electron injection and impact ionization problems by placing drain region boundaries a lower portion of a doped polysilicon spacer. CONSTITUTION: A gate oxide is formed on a semiconductor substrate. A gate electrode-stacked structure is formed on the upper portion of the gate oxide. A first spacer(140) of a doped polysilicon is formed on the upper portion of the gate oxide and on both side walls of the gate electrode-stacked structure. A second spacer(141) is formed on the upper portion of the gate oxide and on both side walls of the first spacer(140). A third spacer(142) is formed on the upper portion of the gate oxide and on both side walls of the second spacer. low and high doped first and second drains(130, 131) are formed.
Patent KR-19990076542-A (KR)
Title: 반도체 기억 장치
IPC: H01L21/8247
Filed: 1998-11-20
Abstract: 복수 비트의 1트랜지스터/1캐패시터형 메모리셀의 메모리셀 최소 단위(MCU)를 열 방향으로 반복하여 배치하고, 또한 행 방향에 대해 열 방향으로 비트선 콘택트(BCT)의 위치를 어긋나게 한다.  이 비트선 콘택트의 위치 어긋남을 소정수의 비트선을 주기로 하여 반복하여 행한다.  비트선의 각 셋트에서 셀 플레이트선 및 비트선 전압을 제어함으로써 메모리셀 데이타가 판독되는 판독 비트선과 기준 전위를 제공하는 참조 비트선의 셋트를 얻을 수 있어 메모리셀 점유 면적을 감소시키고 또한 폴드 비트선 배치의 감지 동작이 가능해진다.  1비트 당 메모리셀 점유 면적을 대폭 감소시키고 또한 폴드 비트선 배치에서의 감지 동작을 행할 수 있다.  1 비트 당 메모리 셀 점유 면적을 대폭으로 감축시키고 또한 폴드 비트선 배치에서의 동작을 행할 수 있다.
Patent KR-20000038050-A (KR)
Title: Structure of mechanical chamber of showcase for evaporating defrost water
Inventor: LEE JIN KYUNG
IPC: F25D21/00
Filed: 1998-12-03
Abstract: PURPOSE: A structure of a mechanical chamber of a showcase for evaporating defrost water is provided to speedily evaporate defrost water collected in a drain water receiver without changing an installation area in the mechanical chamber. CONSTITUTION: A structure of a mechanical chamber of a showcase for evaporating defrost water includes a compressor(1), a condenser(2), a condenser fan(4) and a drain water receiver(9), wherein the condenser, the condenser fan and the compressor are installed in a diagonal direction for facing the fixed drain water receiver(9) to apply heat of the compressor and the condenser to the drain water receiver effectively without changing installation area of the mechanical chamber, wherein a front grill(7a) is installed by expanding in a lateral side of the mechanical chamber for smooth introduction of air in the diagonal direction.
Patent KR-20000038174-A (KR)
Title: Device for controlling mute of car audio and method thereof
Inventor: LEE WON YEONG
IPC: G11B20/00
Filed: 1998-12-04
Abstract: PURPOSE: A control device of mute for a car audio and its method are provided to improve a tone quality of audio and to cheaply produce the car audio by muting an audio signal of the car audio without using an expensive sound controlling IC exclusively for zero-crossing mute and without generating a pop noise at the mute of the audio signal. CONSTITUTION: A selection of mute is repeatedly decided through an inputting unit of key(51). When a mute is selected, an A/D conversion is performed about an audio signal from a selecting unit of input(52) and the mute of the audio signal is controlled(54) by deciding a zero-crossing which a level of the audio signal becomes "0" based on the converted data(53). When a release of mute is selected by deciding the selection of mute is repeatedly decided through the inputting unit of key(5)(55), the A/D conversion is performed about the audio signal from the selecting unit of input(14) and the mute release of the muted audio signal is controlled in the zero-crossing point by deciding the zero-crossing based on the converted data(57).
Patent KR-20000039001-A (KR)
Title: Optical pump laser valve and apparatus
Inventor: SONG CHEONG DAM
IPC: H01S5/187
Filed: 1998-12-10
Abstract: PURPOSE: An optical pump laser valve and apparatus capable of improving a luminance and contrast of a projection display device, embodying an image of a laser, and compacting the device are provided. CONSTITUTION: An optical pump laser valve includes a laser resonator(9), an optical pumping source(10), and an optical valve(8). The laser resonator(9) generates a resonance with respect to a light having a predetermined wavelength. The optical pumping source(10) performs a pumping operation so that laser resonator(9) produces a laser beam. The optical valve(8) filters the laser beam emitted from laser resonator(9) so that the laser beam forms an image screen.
Patent KR-19990063178-A (KR)
Title: 요금 징수 시스템
IPC: G06Q50/00
Filed: 1998-12-18
Abstract: 본 발명은 요금 징수 시스템에 관한 것으로 로드/배출될 수 있는 IC카드(저장된 가격 카드)에/로부터 유료 도로를 통과하는 차에 설치된 무선 판상 장치와 판상 장치와 무선 통신 또는 IC카드 자체와 통신을 통해 IC카드 사용자로부터 유료 도로를 사용하기 위해 요금을 징수하기 위한 길가 설비를 포함하고 판상 장치와 IC카드 사이에 액세스가 완료된 경우, 액세스 완료 데이터는 IC카드에 기록되고 이 액세스 완료 데이터는 판상 장치가 IC카드를 액세스할 때 체크되고, IC카드가 판상 장치 내로 로드될 때 IC카드에 기록된 액세스 완료 데이터가 없다고 확인되는 경우, IC카드는 판상 장치로부터 배출되는 것을 특징으로 한다.
Patent KR-20000040654-A (KR)
Title: Apparatus for adjusting volume in 2 tuner television and method thereof
Inventor: LEE HYEON CHEOL
IPC: H04N5/60
Filed: 1998-12-18
Abstract: PURPOSE: An apparatus for adjusting volume in 2 tuner television and a method thereof are provided to display volumes of main and auxiliary screens for user convenience. CONSTITUTION: An apparatus for adjusting volume in 2 tuner television includes a main tuner(2) and an auxiliary tuner(3), a main and auxiliary signal processors(4,5), a speaker(11), a PIP(picture in picture) picture generator(6), a mixer(7), a CRT(cathode ray tube)(8), a memory(15) and a controller(14). The main and auxiliary tuners(2,3) selects an intermediate frequency signal. The main and auxiliary signal processors(4,5) separates the intermediate frequency signal, which are output from the speaker(11). The PIP picture generator(6) processes the separated picture signal. The memory(15) stores volumes of main and auxiliary screens respectively. The controller(14) displays main and auxiliary volumes stored in the memory when a screen change is selected by a user.
Patent KR-20000041180-A (KR)
Title: Synthetic oligopeptide for diagnosis of haemorrhage fever with renal syndrome and method thereof
Inventor: JEON YEONG JUNG
IPC: C07K7/08
Filed: 1998-12-19
Abstract: PURPOSE: Synthetic oligopeptide containing the amino acid sequence of -VRDAEKQYEKD-, at between 25-35 from amino terminal of Hantaan virus nucleocapsid protein, and synthetic oligopeptide containing the amino acid sequence of -VKDAEKQYEKD-, at between 25-35 from amino terminal of Seoul virus nucleocapsid protein, are provided. The synthetic oligopeptides are used as diagnostic antigens of haemorrhage fever with renal syndrome. CONSTITUTION: A diagnostic method of haemorrhage fever with renal syndrome is carried out by the enzyme immuno assay investigating the antigen-antibody reactivity of the oligopeptide with the serum of patients.
Patent KR-20000041833-A (KR)
Title: Field emission device with increased effective emission area
Inventor: HAN JUNG IN
IPC: H01J19/24
Filed: 1998-12-23
Abstract: PURPOSE: A field display device with increased effective emission area is provided to enlarge an effective luminous area, but also to increase the luminance of a fluorescent film. CONSTITUTION: A field display device increases the luminance of a fluorescent film by increasing the effective emission area where the fluorescent film is coated in order to increase the luminance characteristics of the device. The field display device includes: a cathode substrate(1) and an anode substrate(6) facing each other; a cathode electrode(2) and a gate electrode(4) formed on the cathode substrate in a matrix shape; an emitter(5) formed in a micro tip shape on the cathode electrode; an anode electrode(7) formed in a transparent conductive material on the bottom of the anode substrate; a black matrix(9) formed on the bottom of the anode electrode in a grid of pixel unit; and a fluorescent film(20) formed on a side and bottom of the black matrix and on the bottom of the revealed anode electrode.
Patent KR-20000042078-A (KR)
Title: System for operating cylinder of truck type hydraulic crane
Inventor: LEE YONG HEON
IPC: B66C13/00
Filed: 1998-12-24
Abstract: PURPOSE: An operation system of a cylinder in a truck type hydraulic crane is provided to make a 2 staged-boom and a 3 staged-boom respectively and simultaneously. CONSTITUTION: In stretching a 2 stage boom and a 3 staged boom simultaneously, boom stretching operation is performed when the booms are contracted completely. The pump hydraulic oil transmitted from a main control valve(7) is flowed into a flux divider(5) by passing a hydro-valve(6). The hydraulic oil divided half by the flux divider is flowed into a 2 staged cylinder and a 3 staged cylinder by passing a contractive control valve(8) and stretches respective cylinder. Herein, a solenoid valve(8c) for operating a 2 staged logic valve and a solenoid valve(8d) for operating a 3 staged logic valve are not applied with electricity. Thus, the booms are stretched in the same length. For stretching only the 2 staged boom, the solenoid valve(8d) for operating a 3 staged logic valve is applied with electricity. A logic valve(8b) for adjusting a 3 staged cylinder is opened. The flux supplied to the 3 staged boom line via the flux divider is bypassed. Thereby, only the 2 staged boom is stretched.