baber/WOPTO huggingface dataset:
Patent KR-20010048871-A (KR)
Inventor: PARK JONG JIN
IPC: G09G3/36
Filed: 1999-11-30
Abstract: PURPOSE: A method for driving a liquid crystal display device is provided to obtain sufficient charging time of a high speed crystal by making the width of a gate on-time pulse long. CONSTITUTION: The liquid crystal display device has liquid crystal pixel cells which are arranged on the crossing part of the plurality of gate lines and data lines in form of matrix. The liquid crystal pixel cells charge the data supplied through the data lines in response to on time of the gate pulse. The pulse widths of the gate pulse(GP) are set to be longer than the scanning period of the one line. The liquid crystal pixel cells charge data that have same polarities in response to the gate pulse. The liquid crystal pixel cells have liquid crystal layers which are composed of a ferroelectric liquid crystal or an anti-ferro electric liquid crystal.
Patent KR-20010054846-A (KR)
Inventor: CHOI HYEON GI
IPC: H04L12/28
Filed: 1999-12-08
Abstract: PURPOSE: A method of selectively controlling a connection request on an IP network providing different services using router information is provided to guarantee a stable QoS(Quality of Service). CONSTITUTION: In the method of selectively controlling a connection request on an IP network providing different services, host S sends to a first bandwidth intermediary(BB1) of the DS domain a resource allotment request to deliver a priority traffic to host D. The BB1 finds out the path using the addresses of the starting point(host S) and the destination point(host D) included in the received message(80). The path can be assumed as (R1,A), (R3,B), (R4,C), (R5,D), (R6,E), (R7,F), (R8,G), (R10,H). The BB1 determines the status information of (R1,A), (R3,D), (R4,c) using a table of itself and request the BB2 of the DS domain(60) about the status information of (R5,D), (R6,E), (R7,F), (R8,G), (R10,H). The BB2 determines the status information of (R5,D), (R6,E), (R7,F) using a table of itself and request the BB3 of the DS domain(70) about the status information of (R8,G), (R10,H). The BB3 determines the status information of (R8,G), (R10,H) using a table of itself and notify the BB2 of the result. The BB2 notifies the BB1 of the status information of (R5,D), (R6,E), (R7,F), (R8,G), (R10,H). After BB1 gathers all the status information, BB1 determines whether to accept the connection request and directs R1 to conduct the request included in the traffic resource allotment request if the connection request has been accepted. The R1 accepts the priority traffic from host S correspondingly.
Patent KR-20010057283-A (KR)
Title: Synchronous dram
Inventor: CHO GYU SEOK
IPC: G11C11/40
Filed: 1999-12-21
Abstract: PURPOSE: A synchronous DRAM is provided to receive address input lines separately from each other instead of layering the address input line with rows and columns so as to enable a burst operation in a bank direction. CONSTITUTION: The synchronous DRAM includes a bank address buffer(12), a bank address generator(16), a bank decoder(18), a mode register(17) and a command interpreter/generator(22). The bank address buffer stores a bank address applied from outside. The bank address generator is coupled with the bank address buffer and generates an internal bank address. The bank decoder interprets the bank address from the bank address buffer and the bank address generator. The mode register is coupled with the row address buffer, a column address buffer, and the bank address buffer and stores the mode data related to the operation of the memory device. The command interpreter/generator interprets the data from the command buffer and the mode register and generates a signal to control the operation of above-mentioned circuits.
Patent KR-20010063025-A (KR)
Inventor: LEE DON SIN
IPC: H01Q1/12
Filed: 1999-12-21
Abstract: PURPOSE: A satellite telecommunication automatic tracking antenna for a movable object such as a ship is provided to mount antennas and telecommunication equipment on the movable object and achieve bidirectional communication service using a telecommunication satellite. CONSTITUTION: A main reflection plate(2) reflects transmission electromagnetic waves or electromagnetic waves received from a satellite. A horn radiator(1) radiates the transmission electromagnetic waves or receive the received waves. A plurality of shaft displacement rotating sub reflection plates(3) is displaced from a shaft of the antenna, and reflects the received waves reflected from the main reflection plate(2) to the horn radiator. An automatic tracking motor driver(19) rapidly rotates the plurality of shaft displacement rotating sub reflection plates(3), tracks the direction of the satellite along the 0 axis of equivalent monopulse generated by the rapid rotation of the sub reflection plates, and controls the rotation of the main reflection plate so that the shaft of the antenna is always oriented to the satellite.
Patent KR-20010063658-A (KR)
Inventor: KIM TAE GYEONG
IPC: H01L21/66
Filed: 1999-12-23
Abstract: PURPOSE: A filter for eliminating moisture of equipment for measuring semiconductor impurity density is provided not to affect the capacity for measuring impurity density even if low density purge gas is used in purging the equipment for measuring the semiconductor impurity density, by installing the filter for eliminating moisture in a purge gas supply line. CONSTITUTION: A filter(300) for eliminating moisture includes a chemical filter, a backflow blocking unit and a mechanical filter. The chemical filter firstly performs a chemical filtering regarding supplied purge gas. The backflow blocking unit intercepts backflow of the chemically-filtered purge gas, and prevents counter contamination. The mechanical filter secondly performs filtering regarding the purge gas induced from the backflow blocking unit.
Patent KR-20010063828-A (KR)
Inventor: JUNG HUI YEONG
IPC: H04B7/06
Filed: 1999-12-24
Abstract: PURPOSE: A device and a method for transmitting packets in variable processing gain packet CDMA(Code Division Multiple Access) system, using a smart antenna, are provided to add simple hardware so as to increase transmission power of transmission data and reduce a transmission time. CONSTITUTION: A scheduling and buffering unit(301) receives user information form mobile terminals for a predetermined input time in a packet type, to classify the user information and periodically output the classified user information. A power and beam generation controlling unit(302) controls the generation of high power beam for each mobile terminal, using the outputted user information. And an emission unit(303) generates beam according to a control signal of the power and beam generation controlling unit(302), for outputting.
Patent KR-20010064112-A (KR)
Inventor: PARK JONG HO
IPC: B60H1/30
Filed: 1999-12-24
Abstract: PURPOSE: Air vent structure for a vehicle is provided to reduce noise from an air vent grille and to promote pleasant indoor environment of a vehicle by preventing outdoor air from blowing to inside through an air vent hole. CONSTITUTION: Indoor air is discharged to outside through air vent holes(20) of an air vent grille(8) if the indoor air has specific pressure. Herein, the indoor air is discharged through another path sufficiently even though a second baffle(16) is mounted between an outer panel(6) and an inner panel(14). Even though a rear bumper(2) and a vehicle body are isolated by a first baffle(12), the air is discharged through another path of the rear pump. Outdoor air is not blown to the air vent grille by the first baffle between the rear bumper and the vehicle body when the outdoor air is flowed through the rear bumper. Thereby, noise caused by a collision between the outdoor air and rubbers(24) is prevented. Noise is generated from the air vent grille when the outdoor air is blown to the air vent grill through the other path. The noise is scattered by the second baffle. Therefore, the noise is not delivered into the vehicle.
Patent KR-20010064515-A (KR)
Inventor: KIM JIN GON
IPC: F04B17/04
Filed: 1999-12-29
Abstract: PURPOSE: Fixing structure of a magnet for a linear compressor is provided to shorten manufacturing time by using a radiation curing bonding agent hardened by fiber material and UV(Ultra Violet) rays for fixing each magnet to a magnet frame. CONSTITUTION: Plural magnets(M) are attached to each magnet mounting groove(51a) of a magnet frame(51). Then, fiber material(53) is wound upon outside of the magnets to mount each magnet to the magnet frame. A radiation curing bonding agent is coated over outside of the fiber material. Herein, the radiation curing bonding agent is hardened by exposure to UV rays. UV rays are radiated toward the radiation curing bonding agent during about 10min. to harden the bonding agent. Thereby, a bonding agent layer(55') is formed. The magnets are fixed to the magnet frame by the fiber material. Finally, the bonding agent layer is processed to a desired size of outer diameter. Therefore, a magnet assembly consisting of the magnet frame, the magnet, the fiber material and the bonding agent layer is obtained.
Patent KR-20010065378-A (KR)
Title: Apparatus for variableness of driving frequency power controller
Inventor: KIM JONG SEON
IPC: H03K17/00
Filed: 1999-12-29
Abstract: PURPOSE: An apparatus for variableness of driving frequency power controller is provided which controls the driving frequency of a piezoelectric transformer with a PWM IC and comparator corresponding to variations in input voltage and frequency in order to allow an inverter using the piezoelectric transformer to use the characteristics of the transformer. CONSTITUTION: A power controller for varying a driving frequency includes a piezoelectric transformer(T1) that has a predetermined driving frequency and boosts a DC driving voltage transmitted from outside to output the DC voltage as an AC driving voltage, and a cold cathode discharge lamp(12) for emitting light according to the AC driving voltage. The power controller further has a comparator for detecting voltages and currents input/output to/from the discharge lamp and compares them to send the compared result to the system, and a frequency converter for receiving the compared result to control a pulse width to change the driving frequency of the piezoelectric transformer and generating a fixed frequency. The power controller also has a switch(11) for receiving the fixed frequency to generate a corresponding switching frequency and transmitting the switching frequency to the piezoelectric transformer to determine if the transformer is driven or not.
Patent KR-20010059566-A (KR)
Title: Evaporator for refrigerator
Inventor: KIM DONG WON
IPC: F25B39/00
Filed: 1999-12-30
Abstract: PURPOSE: An evaporator for a refrigerator is provided to supply the sufficient amount of cold air under the same conditions by increasing heat exchanging efficiency of an evaporator having a refrigerant tube integral with a heat exchanging fin. CONSTITUTION: Low-temperature low-pressure refrigerant flows into an evaporator when a refrigerating cycle of a refrigerator is driven. The refrigerant absorbs external heat by flowing through corrugated portions(12a,14a) in each refrigerant tube(12,14). The contact area between the refrigerant and inside of the refrigerant tubes becomes large by the corrugated portion of the refrigerant tubes. Thereby, heat exchanging efficiency of the refrigerant is kept sufficiently. While the refrigerant is evaporated, external air flows outside the refrigerant tubes to exchange heat. The air is heat-exchanged with a heat exchanging fin(16) as well as with the refrigerant tubes. The refrigerant tubes have oval form to obtain a large contact area with external air. Therefore, a large amount of air is heat-exchanged by contact with the refrigerant tubes. The heat exchanging efficiency is improved.
Patent KR-20010059603-A (KR)
Inventor: SEO SEONG MO
IPC: C21C5/42
Filed: 1999-12-30
Abstract: PURPOSE: A converter including a gas ejecting nozzle for forming a gas curtain is provided which not only improves quality of molten steel but also reduces the addition amount of slag check ball, and improves workability of an operator by improving the closing ratio of slag check ball added at a time point of 2/3 tapping. CONSTITUTION: The converter (1) including a gas ejecting nozzle for forming a gas curtain comprises a gas blowing nozzle (7) that is adhered to a position which is 1 to 1.5 m straightly under the tap hole (5) of a converter consisting of magnesium oxide (MgO), wherein a stainless steel pipe having an inner diameter of 1 to 4 mm is installed inside the gas blowing nozzle, a plurality of gas blowing nozzles are adhered to the converter depending on the size of the converter so that a distance between the nozzles is 1 to 2 m, an inert gas is used as a gas supplied through the gas blowing nozzle, and the gas supplied through the gas blowing nozzle is supplied so that a flow rate of the gas is 0.001 to 0.002 Nm3/T-min-tuyere.
Patent KR-20010066358-A (KR)
Inventor: CHA MIN SU
IPC: B63B9/00
Filed: 1999-12-31
Abstract: PURPOSE: A skid bogie is provided to improve the productivity in a shipbuilding plant having a small dock crane. CONSTITUTION: Produced blocks(11) are transferred to a dry dock(13). A skid bogie(14) is installed in the dry dock. The transferred blocks are put on the skid bogie by pulling with a large marine crane(12). The skid bogie is located in a loading position inside the dock with a winch(15). A position of the blocks is adjusted finely. Thereby, the large blocks are loaded in a shipbuilding plat having a small dock crane. Therefore, the productivity is improved.
Patent KR-20000029490-A (KR)
Inventor: KOWALSKI JACEK
IPC: G06K19/07
Filed: 1997-06-25
Abstract: PURPOSE: A noncontact integrated circuit is provided to allow a direct activation of a charge pump by using a coil of a resonant circuit, without detuning the resonant circuit. CONSTITUTION: An integrated circuit(30) able to be operated without contact by means of at least one coil forming a tuned resonant circuit with a tuned capacitor, comprises a charge pump(10) with two clock inputs. At least during non-contact periods of the integrated circuit, the clock inputs of the charge pump are permanently connected to the coil terminals, the charge pump capacitor seen from its clock inputs forming a permanent component of the tuning capacitor of the tuned resonant circuit.
Patent KR-20000068630-A (KR)
IPC: B61F5/32
Filed: 1998-06-08
Abstract: A running gear for a rail vehicle having sprung longitudinal members of plastic, connected to one another by means of a cross-member structure and at their free ends to axle-boxes for rail wheels. In order to obtain optimal stability of the wheelset guidance with reduced loading of the sprung longitudinal members, the longitudinal members each has at least two flexural springs between the ends of which in each case an axle-box is fixed in symmetrical arrangement.
Patent KR-20000049276-A (KR)
Title: Telecommunications network with portability of mobile subscriber number
Inventor: KALLIONIEMI KARL-ERIK
IPC: H04Q11/04
Filed: 1997-10-17
Abstract: PURPOSE: A telecommunications network with portability of mobile subscriber number is provided to facilitate providing number portability for a mobile subscriber, as occurs when a mobile subscriber changes service providers. CONSTITUTION: A telecommunications network(10) comprises a set of service provider/operator domains(20), including mobile telecommunications domains(20A-20C). A call-originating domain(20F) accesses a mobile subscriber number portability database(30F) to obtain the address of the gateway node(GMSC) of the telecommunications domain which currently serves a called mobile subscriber having a mobile station(70), and optionally the address of the home location register(HLR) of the called mobile subscriber. The address of the gateway node obtained from the database and optionally the address of the home location register are included along with the directory number(MSISDN) or IMSI of the called mobile subscriber in a routing message for completing the call. When changing service providers(e.g., changing to a new domain), the mobile subscriber number portability database is updated to reflect the change. Access of the database and usage of the address of the gateway node of the new domain in the routing message permit the mobile subscriber to retain the same MSISDN when changing service providers.
Patent KR-20000052786-A (KR)
Inventor: POMPLUN KLAUS
IPC: B01D46/52
Filed: 1997-10-22
Abstract: PURPOSE: A filter device for filtering a fluid is provided which can be produced at low cost and which provides for a reliable sealing of the filter element frame in the housing receiving the same. CONSTITUTION: A filter device for filtering a fluid, in particular for filtering the air-flowing into the passenger compartment of a vehicle, comprises a filter element(10; 60) comprising a filter material(12; 62) with a border(14; 64)and a filter element frame(20; 70) connected with the filter material and extending at least partly along the border, the filter element frame being provided with a projecting resilient sealing lip (24; 74) for abutting a device(42, 44, 48) receiving the filter element, the sealing lip (24; 74) having at least one bending section(26) of a first thickness(30) facing the filter element frame and at least one enlarged section(28) adjoining the at least one bending section and facing away from the filter material, at least a part(40) of the enlarged section being of a second thickness(32) greater than the first thickness in the at least one bending section.
Patent KR-20000069959-A (KR)
Title: 타이어의 균일성 테스트 시스템
IPC: B60C25/00
Filed: 1998-01-22
Abstract: 타이어의 균일성 테스트 시스템은 받침대와 같은 프레임 구조 상에 장착되는 테스트부(12) 및 상기 테스트부에 인접하게 위치되는 입구부 컨베이어(10)를 포함한다. 상기 입구부 컨베이어는 타이어의 회전축(154)이 테스트부(12)의 회전축(156)으로부터 미리 결정된 거리로 위치되도록 타이어(102)를 수용하고 타이어(102)를 중심 맞추며, 컨베이어(100a)는 타이어를 테스트부(12)로 수송한다. 테스트부(12)는 회전 가능한 척, 및 타이어(20)의 비드(beads)를 맞물리며 타이어(20)를 회전시키기 위해 회전되는 상부 림 및 하부 림을 포함하는 프레임에 장착되는 스핀들 조립체를 포함한다. 상기 회전 타이어(20)는 타이어(20)의 균일성을 표시하는 전기 신호를 발생시키는 로드휠(loadwheel)(42)에 의해 맞물린다.
Patent KR-20000070343-A (KR)
IPC: H01H71/52
Filed: 1998-01-21
Abstract: 본 발명은 자동차 배터리의 부하 회로용 부하 단절 스위치에 관한 것이다.  상기 부하 단절 스위치는 콘택 장치(14, 15, 36)에 의해서 극 단자(4)와 메인 회로(8) 사이에 접속된다.  수동으로 작동되는 스위치 아암(45)을 통해서 콘택 장치는 그것의 폐쇄 상태에 로킹되며, 상기 로킹은 래칫(39)을 통해서 이루어진다.  상기 래칫(39)은 다른 한편으로 전자기 장치(26, 27)의 전기자와 결합된다.  이러한 방식으로 장애 상태가 발생되었을 때 전자기 장치를 통해서 콘택 장치는 로킹 해체되고 회로는 중단된다.  상기 단절 스위치에 의해서 자동차의 전기 시스템이 사고시에 또는 단락시에 신속하게 무전류 상태로 접속될 수 있음으로써, 화재 위험이 감소되거나 또는 그밖의 장애 상태에서도 배터리의 방전이 피해진다.
Patent KR-20000075663-A (KR)
Title: 높은 항혈전용해 활성을 갖는 글리코스아미노글리칸
IPC: A61P7/02
Filed: 1998-03-24
Abstract: 본 발명은 시험관내에서 높은 항혈전용해 활성을 갖는 글리코스아미노글리칸에 관한 것이다. 상기 글리코스아미노글리칸은, 출발 과황산화 글리코스아미노글리칸의 유기 염기의 염을 제조하고, 상기 염을 부분적으로 가용매 탈황산화한 다음, 상기 부분적으로 탈황산화된 생성물을 N-재황산화함으로써 여러가지 종류의 글리코스아미노글리칸으로부터 얻어진다.
Patent KR-20000075891-A (KR)
Title: 적층 물품의 분배 유니트
IPC: B65D83/08
Filed: 1998-02-27
Abstract: 본 발명은 적층 물품(laminar articles)(12)의 하나 이상의 적층을 포함하는 분배 유니트(11)용 분배 면(10)에 관한 것으로, 상기 분배 면(10)은 연속적이며, 측방향 바깥 에지(13,14), 장방향 바깥 에지(15,16), 및 두 개 정도의 구멍(orifices)(17,18)을 포함한다. 제 1 구멍(17)과 제 2 구멍(18)은 동일 평면이며, 제 2 구멍(18)은 제 1 구멍(17)과 별개이며 상기 제 1 구멍(17)으로부터 20 밀리미터 정도의 거리에 배치된다.
Patent KR-20000076238-A (KR)
Title: 가열 또는 세라믹 용접용 랜스
IPC: B23K5/12
Filed: 1998-04-02
Abstract: 팁 단부와 버트 단부를 구비하고 팁 단부에 중앙 주내강이 있는 헤드부를 구비하는 단일 튜브형 랜스를 포함하며, 이에 따라 산화성 입자를 함유하는 입상 물질과 연소-지지 캐리어 가스를 포함하는 세라믹 용접 재료가 버트 단부에서 도입되어, 주내강을 통과하여 팁에서 나타나는, 택일적으로 화염을 발생시키거나 세라믹 용접을 수행하는 장치에 있어서, 헤드부(10 + 20)가 연료가스와 연소-지지 가스의 혼합물을 운반하기 위한 적어도 하나의 도관(28)을 추가로 포함하며, 각각의 이러한 도관(28)은 랜스의 팁에 오리피스(29)를 구비하며 연료가스 도입부(28a) 및 연소-지지 가스 도입부(28b)가 제공되며, 이에 따라 버트 단부에서 도입된 연료가스와 연소-지지 가스가 도관(28)에서 합류하여 나타나 도관 또는 각 도관(28)의 팁 단부에 화염을 형성함을 특징으로 하는 장치
Patent KR-20010005937-A (KR)
Title: 브롬화수소산 수용액으로부터 알칸올을 회수하는 방법
IPC: C07C29/80
Filed: 1998-04-03
Abstract: 본 발명은 알칸올 및 수성 브롬화수소산을 포함하는 유체로부터, 과량의 알킬 브로마이드를 생성시키지 않으면서 알칸올을 회수하는 방법을 제공한다.  본 발명의 특정한 양태에서, 알칸올 및 수성 브롬화수소산을 포함하는 유체를 증류 컬럼에 컬럼의 저부 내지 상부 사이의 지점에서 도입함으로써, 상당량의 알킬 브로마이드를 생성시키지 않으면서 알칸올 및 브롬화수소산을 분리하는 증류 시스템을 제공한다.
Patent KR-20010074342-A (KR)
Title: The methods of advertisement through out the website of computer
Inventor: JUNG UN YOUNG
Filed: 2000-01-25
Abstract: PURPOSE: A method for the ad(advertisement) through the web site of the computer is provided to maximize the effect of the ad by advertising with fitness to the age class or specific character of a consumer. CONSTITUTION: The kind of the ad is divided into a nationwide ad, a local ad, and a time ad. The nationwide ad is played for ten minutes at every time, brings files configured from the whole country through a main server before five minutes of the ad time, and the files is successively played at every two minute. The local ad is composed of the administrative area, is played between thirty and forty minute of every time, brings files configured from the server of the relevant area before five minutes of the ad time, and the files is successively played at every two minute. The time ad is played during the rest time except the nationwide and local ad time.
Patent KR-20010077071-A (KR)
Title: A prepartion method for a ceramic filter having continual antibiotic property
Inventor: CHO YEONG SANG
IPC: C04B38/06
Filed: 2000-01-31
Abstract: PURPOSE: A preparation method of porous ceramic filter, especially, being applied to a water purifier, having filtering and antibacterial effects at a time is provided which simplifies structure of water purifier and improves antibacterial durability by dispersing Ag into ceramic raw materials. CONSTITUTION: The method comprises the steps of: (i) mixing 70-99.9wt.% of ceramic materials composed of one or more of clay, kaolin, feldspar and pottery stone with 0.1-30wt.% of silver salt such as silver acetate, silver carbonate and silver oxalate; (ii) mixing 30-95wt.% of the ceramic materials of step (i) with 5-70wt.% of powdered flammable materials such as carbon compound(graphite, carbon black), hydrocarbon compound(melamine, sugar) and mixture thereof; (iii) forming, drying and sintering at 500-1200deg.C for more than 1hrs. Also, the following Ag-coating step can be added: soaking the ceramic filter silver into salt solution containing 1-20wt.% of Ag+ ions; drying and sintering it at 500-1200deg.C for more than 30min.
Patent KR-20010083491-A (KR)
Title: The High-speed LSP Transformation Algorithm in Vocoder
Inventor: BAE MYUNG JIN
IPC: G10L19/07
Filed: 2000-02-15
Abstract: PURPOSE: A high speed LSP sampling algorithm of a vocoder is provided to reduce a calculating time of a real root method which is used in a vocoder. CONSTITUTION: After odd numbered coefficients are firstly searched, even numbered coefficients are searched among the searched odd numbered coefficients. When searching the odd numbered coefficients, frequency bands are sequentially searched. Accordingly, most of a change time is spent to search the odd numbered coefficients. An LSP parameter is sensitive to a predetermined spectrum. A spectrum distortion of the LSP parameter is low. A searching time is reduced by differing an order of a searching section according to a distribution of the LSP parameter by 46% without sequentially searching a frequency band.
Patent KR-20000076735-A (KR)
Title: 플랙시블 프린트배선판 압착단자 및 이것을 이용한 코어의압착구조
IPC: H01R12/65
Filed: 2000-02-25
Abstract: 평판으로 형성된 바닥판(11)과, 바닥판(11)의 단부에서 기립하는 걸림편(12)을 구비한 FPC압착단자(10)로서, 이 FPC압착단자(10)는, 코어(41) 또는 리드선(51)을 FPC(30)의 도체(32)에 밀착시키고, 걸림편(12)을 FPC(30)에 이면 또는 표면에서 꽂고, FPC(30)로부터 돌출된 걸림편(12)의 선단을 바닥판(11)을 향해서 구부리면, 걸림편(12)의 선단과 바닥판(11)사이에서 코어(41) 또는 리드선(51) 및 FPC(30)를 끼워 유지시시킬 수 있도록 형성되어 있다. 걸림편(12)을 이용해서 블랭킹공정과 접속공정을 한 번에 행함으로써, FPC압착단자(10)를 소형화하고, 또 공정감소에 의해 작업성을 향상시킬 수 있다.