baber/WOPTO huggingface dataset:
Patent KR-20000008816-A (KR)
Title: Wafer cooling chamber
Inventor: JIN WON JAE
IPC: H01L21/00
Filed: 1998-07-16
Abstract: PURPOSE: A wafer cooling chamber is provided to shorten a total cooling time of the wafer and improve a cooling efficiency by forming a cooling line between a cooldown pedestal plate and a bellows assembly. CONSTITUTION: The cooling chamber(40) comprises a cooldown pedestal plate(42), a bellows assembly(46) formed under the pedestal plate(42) and a cooling line(48) formed between the cooldown pedestal plate(42) and the bellows assembly(46), wherein the spaced distance between cooldown pedestal plate(42) and the cooling line(48) is shorter than that of the spaced distance between the cooling line(48) and the bellows assembly(46). Thereby, thermal transfer efficiency from the cooldown pedestal plate(42) to the cooling line(48) is increased.
Patent KR-20000009197-A (KR)
Title: Manufacturing method of plasma display panel
Inventor: KIM SANG TAE
IPC: H01J11/44
Filed: 1998-07-22
Abstract: PURPOSE: A manufacturing method of plasma display panel is provided to enhance productivity by shortening processes, and to realize the low voltage operation of a PDP by preventing the resistance increase of an electrode. CONSTITUTION: The present invention discloses a manufacturing method of plasma display panel comprising: a step forming sustain electrodes on a substrate; a step forming the first dielectric layer on the front surface of the substrate; a step forming a black matrix layer on the first dielectric layer; and a step forming the second dielectric layers on the front surfaces of the first dielectric layer and the black matrix layer. the BM layer and the second dielectric layer are simultaneously plasticized. Therefore, the present invention can enhance productivity by reducing processes and realize the low voltage operation of the PDP by preventing the resistance increase of the electrodes.
Patent KR-19980072143-A (KR)
Title: 음식물 쓰레기 발효 및 건조 장치
IPC: B09B3/00
Filed: 1998-07-25
Abstract: 본 발명은 가정이나 식당에서 주로 발생되는 음식물 쓰레기를 발효와 동시에 균일한 온도로 가열하면서 교반하여 습기를 제거함으로써 사료로 사용할 수 있도록 한 음식물 쓰레기 발효 및 건조 장치에 관한 것이다. 
     본 발명의 쓰레기 발효 및 건조 장치는 일단부가 막혀 있고 타단은 개구되며 내주면에는 개구부를 향해 나선형의 홈이 형성되고 개구부쪽이 높도록 경사지게 설치된 원통형의 교반 수단과, 상기 교반 수단의 내부로 음식물 쓰레기가 투입되도록 연통된 투입구와, 상기 교반 수단을 회전시키는 구동 수단과, 상기 교반 수단의 외주면을 둘러싸고 있으면서 교반 수단의 온도를 균일하게 유지시키고 교반 수단과 일체로 회전되는 열매체와, 상기 열매체와 일정 정도 이격되게 설치되어 내부의 열이 빠져나가는 것을 차단하는 단열재와, 열매체와 단열재 사이의 가열 통로로 열을 공급하는 버너와, 상기 교반 수단 내부의 온도가 일정 상태를 유지하도록 상기 버너를 제어하는 서모 컨트롤러로 구성된 것을 특징으로 하고, 통 자체가 회전되므로 교반 도중 이물질에 의해 정지되는 일이 없고 열매체를 사용하므로 회전체 내부의 온도를 균일하게 유지시킬 수 있으므로 미생물을 이용한 발효가 용이한 효과가 있다.
Patent KR-19990023271-A (KR)
Title: 평면 회로용 전기 커넥터
IPC: H01R12/83
Filed: 1998-07-31
Abstract: 전기 커넥터(1, 41)는 평면 전기 회로(30, 43)를 수용하기 위한 슬롯(9, 46)을 형성하는 긴 유전체 하우징(3, 44)을 구비한다.  다수의 단자(2, 42)는 접촉부(6, 47)가 상기 슬롯을 따라 이격된 상태로 상기 하우징에 장착된다.  금속제 작동기(4, 45)는 상기 하우징에 장착되고 단자의 접촉부에 대해 평면 전기 회로를 편의(bias)시키기 위한 가압판 부분(25, 62)을 구비한다.  긴 가요성 스트립 부분(22, 67)은 가압판 부분의 전방으로 이격되고 슬롯의 유입구(mouth)에 예비 회로 보유 수단을 형성하기 위하여 하우징의 종방향으로 연장한다.  가압판 부분(25, 62)은 개방 영역(29, 60)에 의해 양 대향 단부에서 긴 스트립 부분(22, 67)으로부터 분리되어 긴 스트립 부분의 가요성과 가압판 부분의 가요성을 분리시킨다.
Patent KR-20000015705-A (KR)
Title: Switch structure for electromotive rear view mirror
Inventor: LIM GI NAM
IPC: B60R1/00
Filed: 1998-08-31
Abstract: PURPOSE: A switch structure for an electromotive rear view mirror is provided to easily install and to improve movement and safety by easily defining the position of a selector knob and a knob for adjusting an angle. CONSTITUTION: The switch has:a body(10) grounding three steps of bottom fixing terminal pieces of a moving groove(12) according to the moving direction of a moving terminal plate(20) of which both ends are formed in a slant face(21) from the moving groove formed on the center of terminal operating bars(11a-11d) for adjusting the angle; and a ring body(30) of which both insides project a projection(31) grounding the slant face, the surface projects many fixing pins(32) and a bottom unit having three step grooves(33a-33b) pushes a projective bar(15), installed to be rotated. Therefore, the switch improves the selector knob and a pushing knob(40) quality and defines the position of those knobs.
Patent KR-20000020112-A (KR)
Title: Device for preventing vehicle from being pushed
Inventor: AHN JOON HYUNG
IPC: B60T7/12
Filed: 1998-09-17
Abstract: PURPOSE: A device is provided to easily install components by automatically operating a brake pedal with a cylinder through a solenoid valve which operates load pressure of a surge tank according to the signal of a push sensor and a slant sensor, and to prevent a vehicle from being pushed on a slant road. CONSTITUTION: A device for preventing a vehicle from being pushed is composed of a push sensor(50), a key cylinder switch(20), a slant sensor(30), an ECU(Electronic Control Unit)(10), a solenoid valve(60), a brake pedal(90) and a cylinder(70). The push sensor installs a radiating device(53) and a light receiving device(52) for sensing and distinguishing the forward rotate and reverse rotate of a wheel from a disc hall(54) installed in a tone wheel. Therefore, when a vehicle is pushed, the push sensor senses the state and the device automatically brakes the vehicle. Also the device releases the braking state when a vehicle starts.
Patent KR-20000021523-A (KR)
Title: Prestress soil nailing method for stabilizing slant face using steel reinforcing
Inventor: KIM KWANG SOO
IPC: E02D17/20
Filed: 1998-09-30
Abstract: PURPOSE: A pre stress soil nailing method is provided to maintain a ground in a steady state as repressing the transformation by increasing strength of the ground by a reinforcing material as reducing the number of installed reinforcing materials to a slant face of cut soil. CONSTITUTION: A pre stress soil nailing method has the steps of: drilling for formation of an insertion hole(21) having a specific depth at a specific position of a slant face of cut soil, inserting a reinforcing material set(1) having hoses(13,14) for grouting into the insertion hole(21), firstly grouting for filling the inside of the insertion hole with grouting materials(11a), establishing a shotcrete facing(4) to establish the front face of the insertion hole(21) with shotcrete or concrete, then applying pre stress by an additional hydraulic pressure jack(3) to the reinforcing materials(11), further secondly grouting for filling the inside of a division pipe(12) with the grouting materials(12a). By repeating this method, at the slant face of cut soil, the reinforcing materials(11) applying the pre stress in a specific interval are fixed to solidify the ground.
Patent KR-20000025312-A (KR)
Title: Infrared ray wireless photo communication module
Inventor: LEE SHI HYUNG
IPC: H04B10/114
Filed: 1998-10-09
Abstract: PURPOSE: An infrared ray wireless photo communication module is provided to be easy to be a connect between modules. CONSTITUTION: A structure of an infrared ray wireless photo communication module comprises first and second photo modules(10). Each of the first and second photo modules(10) has an emission and reception part(11) for an infrared ray communication and installed at a center of a corresponding photo module(10). At an upper part of the photo module(10) is installed a red laser diode(12) so as not to block a path of the emission and reception part(11). A reflection body(13) as a reception part is installed so as to be opposed to the red laser diode(12). At a lower part of the photo module(10) is installed a red laser diode(12) so as not to block a path of the emission and reception part(11). A reflection body(13) as a reception part is installed so as to be opposed to the red laser diode(12). Power switches(16) are installed at the photo module(10) so as to be adjacent to corresponding red laser diodes(12).
Patent KR-20000025636-A (KR)
Title: Method for manufacturing capacitor of semiconductor memory device
Inventor: AHN GI CHEOL
IPC: H01L29/92
Filed: 1998-10-13
Abstract: PURPOSE: A method is provided to facilitate the planarization through a reduction of a height difference between cells and peripheral circuits by completing a capacitor on a cell region through a removal of a conductive layer for forming an upper electrode of the capacitor. CONSTITUTION: A capacitor formation oxide layer(27) is selectively removed to form a space for a capacitor to be formed. A capacitor lower electrode formation polysilicon is deposited on the front surface of a substrate. A chemical and mechanical polishing is used to remove the polysilicon layer of a portion not to be used for a lower electrode of a capacitor and the capacitor formation oxide layer(27) simultaneously, to thereby form the lower electrode of the capacitor in the capacitor formation space. Only portions for the capacitor formation oxide layer(27) formed on a cell region is selectively removed.
Patent KR-20000028353-A (KR)
Title: Power semiconductor device and manufacturing method thereof
Inventor: CHOI CHANG SEONG
IPC: H01L29/772
Filed: 1998-10-31
Abstract: PURPOSE: A power semiconductor device is provided to have a withstand voltage characteristic of a bipolar transistor and a proper threshold voltage of a DMOS transistor. CONSTITUTION: A second conductive N-typed well(46) is formed on a first P-typed semiconductor substrate(42) to form a bipolar transistor and a DMOS transistor, respectively. The semiconductor substrate is provided on its surface with a field insulated film(44) to divide the well. A P-typed body region(52) is formed on the N-typed well, and a P-typed dopant region(50) is formed both sides of the P-typed body region with the bipolar transistor formed. The dopant region is formed in order of 1.0E15 atom/cm¬2 to 5.0E atom/cm¬2 to improve a withstand voltage of the bipolar transistor. A P-typed base region(62) is formed in the dopant region, and an emitter region(64) is formed in the first body region. A collector region(66) is formed in on a portion of the first region remote from the first region.
Patent KR-20000028389-A (KR)
Title: Circuit for decreasing harmonics of vacuum cleaner
Inventor: AHN CHI HYEONG
IPC: H03H3/00
Filed: 1998-10-31
Abstract: PURPOSE: A circuit for decreasing harmonics of a vacuum cleaner is to reduce the harmonics by operating a tap motor in order of 1200 W when the vacuum cleaner is operating in a mid outputting mode and by operating the tap motor in order of 155 W when the cleaner is operating in a highest outputting mode. CONSTITUTION: A harmonic suppressing circuit of a vacuum cleaner controls the application of a current power supply by operating a gate of a thyristor(5) with a time constant of a condenser(C1) and a variable resistor(VR). The circuit comprises a tap motor(TM) having a first driving tap(T1) and a second driving tap(T2), a tap switch(SW1) for selecting the first or second driving tap of the tap motor, a tap selecting switch(SW2) for commanding the tap selection of the tap switch to short-circuit both ends of the variable resistor, and a tap selecting switch driving member(10) for operating the tap selecting switch when the cleaner is operating in a highest outputting mode.
Patent KR-20000034039-A (KR)
Title: Method for manufacturing superconduction device for detecting thermal image
Inventor: KIM TAE HOON
IPC: H01L27/146
Filed: 1998-11-27
Abstract: PURPOSE: A method for manufacturing superconduction device for detecting thermal image is provided to increase operation fidelity and to shorten the process time, by way of omitting a polishing operation during manufacturing the super conduction device. CONSTITUTION: A method for manufacturing superconduction device for detecting thermal image includes a first to a fifth step. At the first step, an insulation preservation membrane(12) is formed on a front side of a dielectric membrane(10). At the second step, a plurality of holes(g) are formed and the insulation preservation membrane(12) is removed by etching the insulation preservation membrane(12) and the dielectric membrane(10) selectively. At the third step, a slag in the holes(g) is removed. At the forth step, an etch stopper membrane(14) is formed selectively only in the holes(g). At the fifth step, a multi-layer membrane of "the first metal electrode(16)/Infrared Radiation absorption membrane/semi-transparency membrane" is formed on the front side of the dielectric membrane(10) including the etch stopper layer(14).
Patent KR-20000037660-A (KR)
Title: Screen control method for pay television program
Inventor: PARK JOO DEOK
IPC: H04N7/16
Filed: 1998-12-01
Abstract: PURPOSE: A screen control method for a pay television program is provided to use a PIP(picture in picture) capability to control the image in/from the pay television decoder. CONSTITUTION: In a screen control method for a pay television program, first of all, whether the pay television decoder is connected through external device is acknowledged. Secondly, whether the user requests the pay television program to be displayed is determined. Thirdly, a PIP controller is controlled when the users request the pay television program to be displayed. At the forth step(S104), the PIP capability is turned on, and the pay television program is displayed.
Patent KR-20000034716-A (KR)
Title: Method for remote controlling of boiler and device thereof
Inventor: LEE HWANG EUI
IPC: F24H9/20
Filed: 1998-11-30
Abstract: PURPOSE: A remote controlling method and device of a boiler are provided to eliminate a movement of an operator of a boiler when using hot water after setting of the temperature of the hot water. CONSTITUTION: Many signals of hot water controlling are transmitted through an electric wire. If the signals are synchronously inputted, the hot water is controlled according to a priority of the hot water controlling signals. The remote controlling device has a controller(110) for controlling the hot water and a boiler for heating and a main operation device(120), which is connected to the controller(110) through a double wire(150), for operating the controller(110) to control the hot water and the heating. Subhot water operating devices(130, 140) for controlling the temperature of hot water are connected to the two line wire(150) parallel. Therefore, the operator can set a temperature of hot water which he wants on a hot water using place and the set temperatures are various according to the place in hot water used.
Patent KR-20000038612-A (KR)
Title: Process for producing heat-resistant thermoplastic resin with improve gloss properties
Inventor: YU KEUN HUN
IPC: C08F220/44
Filed: 1998-12-08
Abstract: PURPOSE: An acrylonitrile-butadiene-styrene(ABS) resin with improved chemical resistance, high impacts, processability, and gloss properties is provided. CONSTITUTION: A ABS resin is provided by mixing 22-37 pts.wt. of graft ABS polymer having less than 0.7% of solidification powder and more than 26% of graft rate, 37-47 pts.wt. of a maleimide-based heat-resistant copolymer prepared by massive polymerization, 20-37 pts.wt. of acrylonitrile-styrene copolymer, an activator, an antioxidant, and a light-stabilizer in the extruding mixer at 230-250°C. The ABS polymer is prepared by copolymerizing 40-70 pts.wt. of a large diameter conjugated diene having an average particle size of 2500-5000 angstrom, 70-95% of gel and a swelling index of 12-30, 15-40 pts.wt. of an aromatic vinyl compound, 5-20 pts.wt. of a cyanide vinyl compound, 0.2-0.6 pts.wt. of an emulsifier, 0.2-0.6 pts.wt. of a molecular weight control agent, 0.1-0.5 pts.wt. of a polymerization initiator.
Patent KR-20000039101-A (KR)
Title: Variable duty cycle generator
Inventor: CHOI SEOK JIN
IPC: H03K5/00
Filed: 1998-12-11
Abstract: PURPOSE: A variable duty cycle generator is provided to perform a desired control operation by excluding a usage of a microprocessor and applying a signal having an optimal frequency and duty cycle to an actuator and a solenoid valve. CONSTITUTION: In a variable duty cycle generator, an oscillator(10) inverts and non-inverts a phase of a sawtooth wave signal outputted by a charge and discharge according to a power supply and outputs a rectangular signal. A multivibrator(20) interrupts rising and falling periods of the rectangular signal from the oscillator(10) and outputs a frequency signal having a predetermined period corresponding to the rising and falling periods. A duty cycle controller(21) controls a period of a frequency with respect to the rising and falling periods from multivibrator(20). A buffer(30) buffers a frequency with respect to the rising and falling periods from multivibrator(20) to exclude a collision of a signal. A switch(SW11) selects the frequency signal with respect to the rising and falling periods from buffer(30) as a signal necessary to a driving shaft.
Patent KR-19990063109-A (KR)
Title: 오층 배터리 격리판
IPC: H01M50/457
Filed: 1998-12-16
Abstract: 본 발명은 함께 적층된 5개의 미공성 막을 지닌 개선된 내분열성 및 파열 강도의 배터리 격리판을 제공한다.   제 1, 제 3, 및 제 5 막은 강도층이고, 바람직하게는 폴리프로필렌이다.   제 2 및 제 4 층은 셧다운 층이고, 바람직하게는 폴리에틸렌이다.   본 발명은 폴리프로필렌-폴리에틸렌-폴리프로필렌-폴리에틸렌-폴리프로필렌의 구성을 지닌 5층 격리판이 동일한 두께의 폴리프로필렌-폴리에틸렌-폴리프로필렌 구조를 지닌 3층 격리판보다 큰 내분열성을 가진다는 발견에 기초한다.
Patent KR-19990030399-A (KR)
Title: 바지선을 이용한 준설 및 수질 정화 시스템
Filed: 1998-12-24
Abstract: 본 발명은 호소내 오폐수 및 축산폐수에 의하여 각종오염물질을 함유한 수질을 정화하거나 퇴적물을 준설하는 것으로 바지선을 이용하여 퇴적물을 확산되지 않도록 구별하여 준설작업을 하며 호소수를 처리수조로 이송시켜 수질을 정화할 수 있도록 하는 바지선을 이용한 준설 및 수질 정화 시스템에 관한 것이다. 
     종래 호소내 오폐수 및 축산폐수 유입은 용존 산소를 소모시키는 유기물로서 이는 부영화를 일으키는 질소와 인등이 각종 오염물질을 함유하여 수질이 악화되며 퇴적물이 쌓이고, 부영화로 녹조류 등이 이상번식하여 생물에 유해한 가스가 발생되며 자정능력을 상실하고 수명이 단축되는 것이다. 
     따라서 본 발명은  부유장치(2)의 내부에 외부의 원수(17)및 퇴적물(18)과 구별되는 처리조(3)를 설치하여 퇴적물(18)을 준설작업을 할 수 있도록 하며, 일측으로 부유물을 제거 하기위한 흡입기(10)를 설치하고 흡입기(10)의 일측으로 오일펜스(20)와 부유물 자연건조장치(11)를 설치하고 부유물 자연건조장치 (11)의 일측에 분리수 탱크(13)를 설치하여 분리수 이송 펌프(14)에서 분리수를 처리조(3)로 재공급하며 처리조(3)의 원수를 흡수파이프(6)로 흡입하여 가압부상 설비(7)에서 초미세기포를 발생하여 배수파이프(8)로 배수시켜 정화하도록 하여 준설작업과 동시에 호소수와 구별되어 슬러지를 부상시키는 방법에 의하여 정화시키는 것이다.
Patent KR-20000043701-A (KR)
Title: Sidewalk block
Inventor: MIN BYUNG IL
IPC: E01C5/22
Filed: 1998-12-29
Abstract: PURPOSE: A sidewalk block is provided to recycle slag of a steel mill. CONSTITUTION: A sidewalk block consists of an upper layer and a lower layer. The upper layer is made from natural powder molded by polymer resin. The lower layer is made from slag pulverization molded by high polymer resin. The block is composed of 2 to 40wt% of polymer resin and 60 to 98wt% of natural powder and slag pulverization. The size of the slag pulverization is less than 3cm and the size of the natural powder is less than 5mm.
Patent KR-20000044291-A (KR)
Title: Line tester for testing line in inside of transmitting system
Inventor: YU IN GWON
IPC: H04B17/00
Filed: 1998-12-30
Abstract: PURPOSE: A line tester for testing lines in inside of a transmitting system is provided to check a line state without the need to cut inner lines by equipping with a three-stage switch. CONSTITUTION: A line tester for testing lines in inside of a transmitting system comprises a right data transceiver(20c), a left data transceiver(20a), and a switcher(20b). The right data transceiver(20c) receives/transmits a data connected with the transmitting system in right direction. The left data transceiver(20a) receives/transmits a data connected with the transmitting system in left direction. The switcher(20b) executes a switching operation to keep back a loop during testing lines, by processing the data receiving/transmitting to right or left direction during operation normally and connecting the left data transceiver(20a) with the right data transceiver(20c). The switcher(20b) comprises a first stage, a second stage, and a third stage. The first stage keeps back a received signal or data, or connects with the second switch by being connected with the left data transceiver(20a). The third switch keeps back the received signal or data, or connects with the second switch by being connected with the right data transceiver(20c).
Patent KR-20000044769-A (KR)
Title: Method for recording copyright information
Inventor: LEE CHANG BEOM
IPC: H04N7/08
Filed: 1998-12-30
Abstract: PURPOSE: A method for recording CONSTITUTION: A method for recording
Patent KR-20000045959-A (KR)
Title: Three-dimensional gyro test equipment
Inventor: LEE JU JIN
IPC: G01C19/00
Filed: 1998-12-30
Abstract: PURPOSE: A three-dimensional gyro test equipment is provided to freely set a rotation speed and direction of a rotation plate mounted with a gyro by a controller and perform a test of performance of two or three gyros simultaneously, thereby reducing testing time. CONSTITUTION: A three-dimensional gyro test equipment includes a plate(10), a fixing plate(20) fixed on the plate with a predetermined distance via a fixing pole(12), a motor(30) fixed below the fixing plate, a rotation plate(50) of which a rotation shaft is fixed at a lower part of the fixing plate for rotating in response to a rotation of the motor, a rotation plate fixed on the rotation plate and having a slant surface to be mounted with a gyro, and a controller(60) mounted on the plate for controlling driving of the motor according to a rotation direction and speed as a preset direction and speed and transmitting gyro information, wherein the slant surface of the rotation plate has an angle of 45 degree.
Patent KR-20000046020-A (KR)
Title: Formation method of inner panel hole of vehicle trunk
Inventor: LEE KWON HEE
IPC: B62D25/12
Filed: 1998-12-31
Abstract: PURPOSE: A formation method of an inner panel hole of a vehicle trunk lead is provided to reduce a weight without weakening of a surface stiffness, by analyzing a former inner panel of vehicle trunk. CONSTITUTION: A formation method of an inner panel hole of a vehicle trunk lead contains the following steps: a first step (S100) to manufacture a shape of an inner panel of vehicle trunk (112) as material of a cooled steel sheet; a second step (S110) to manufacture a forming part (116) to weld the manufactured steel sheet to a outer panel; a third step (130) to determine portions of holes (118) by analyzing the manufactured inner panel of vehicle trunk using an optimum design program; a fourth step (S140) to manufacture holes in the determined portions of the holes.
Patent KR-20000046293-A (KR)
Title: Gate pulse generator for time to digital converter
Inventor: LEE CHUL HO
IPC: H03K3/00
Filed: 1998-12-31
Abstract: PURPOSE: A Gate Pulse Generator Device for Time to Digital Converter (TDC) is provided to exactly convert the interval between trigger pulse and sampling pulse into pulse width. CONSTITUTION: A Gate Pulse Generator Device for Time to Digital Converter (TDC) includes a primary storage method which momentarily stores transition time of the trigger pulse, a secondary storage method which momentarily stores transition time of the sampling pulse, a time delaying method which delays sufficient amount of time in order to provide the secondary storage method to maintain a stable status, and an interval detection circuit which detects the interval between the storage time of the primary storage method and the output of the time delaying method. The device ensures accurate gate pulse that enables to prevent any possible effect of Interleaved Data that might interrupt high resolution.
Patent KR-20000046991-A (KR)
Title: Method for controlling multi orientation of manual type
Inventor: CHOI SANG WON
IPC: G05B19/05
Filed: 1998-12-31
Abstract: PURPOSE: A method for controlling a multi-orientation of a manual type is provided to shorten the work hours and enhance the work efficiency by moving a chuck of a multi-orientation state to a setting positions. CONSTITUTION: A method comprises the steps of: setting values with respect to respective positions in a numeric control unit in order for a chuck to be capable of being stopped in respective multi-orientation positions(S1); confirming whether position selection and start buttons are pressed(S2); confirming whether a set position and a press value are matched(S3); rotating and stopping the chuck to a selected position and performing the step S2 if matched(S4); and alarming if not matched(S5), to thereby shorten the work hours and enhance the work efficiency.