baber/WOPTO huggingface dataset:
Patent KR-20000049292-A (KR)
Inventor: KIM JIN YONG
IPC: G11B7/26
Filed: 2000-04-10
Abstract: PURPOSE: An optical recording medium with high density and a production method thereof are provided to ensure excellent planarization by inhibiting a bending deformation by symmetric junction of substrates even forming a thin light permeable layer. CONSTITUTION: First and second cover layers(20,22) are symmetrically joined upward and downstream of a substrate layer(24). The first cover layer serves as a light permeable layer of an optical beam incident thereon from an object lens(8). The substrate layer contains a recording surface to form a reflective film(12). Herein, the first cover layer has a thickness thinner than an existing DVD(Digital Video Disk) for ensuring a tilt margin dependent upon a high density. The second cover layer is combined to the substrate layer in a symmetrical fashion to prevent an optical recording medium from being bent depending on a changed drive condition. Herein, the second cover layer is formed in the same thickness as the first cover layer. Therefore, the optical recording medium with high density and having excellent planarization is achieved.
Patent KR-20010097166-A (KR)
Inventor: KIM SANG KWON
IPC: G06F17/00
Filed: 2000-04-20
Abstract: 본 발명의 정보 제공 방법은 정보를 제공하는 매체 서버와 상기 매체 서버에 접속하는 사용자 컴퓨터를 포함하는 정보 제공 시스템에 관한 것이며, 상기 매체 서버는 정보 항목의 배열이 노출되지 않은 상태로 포함된 문서를 사용자 컴퓨터에 송출하고, 사용자로부터 상기 문서에 포함된 정보 항목을 입력받아 수집하며, 노출되지 않은 정보 항목이 일정 항목 이상 수집된 경우 사용자에 보상하는 방법을 구현하고, 상기 방법을 구현하는 시스템을 제공함으로써 정보 제공의 효과를 증진시킨다.
Patent KR-20010097639-A (KR)
Inventor: PARK HUI SUK
IPC: H01L21/20
Filed: 2000-04-25
Abstract: 원자층 증착에 의한 산화알루미늄막을 이용한 구리배선 형성방법에 관해 개시한다.  본 발명은 구리배선에 사용되는 저유전막 표면에 원자층 증착에 의한 산화알루미늄막을 형성시킴으로써, 절연막 표면에 노출된 탄소성분을 제거하여 구리배선과 절연막 사이의 접착력을 강화시키고, 동시에 절연막의 유전 특성이 변하는 것을 방지하고, 상기 산화알루미늄막이 후속공정에서 마스크층 및 연마저지층의 역할을 할 수 있도록 한다.
Patent KR-20000058374-A (KR)
Inventor: KIM SEA GUN
IPC: G09F21/06
Filed: 2000-05-09
Abstract: PURPOSE: A balloon decorating frame is provided to accomplish an improved effectiveness of advertising while allowing the frame to be utilized in a variety of shapes. CONSTITUTION: A frame comprises a connection ball(20) having at a whole surface thereof a plurality of coupling holes(21), a connection member(10) consisting of a pair of connection ends(13) having a coupling protrusion to be inserted into the coupling holes formed at the connection ball, a connection rod(11) for connecting the connection ends and which has a predetermined length. A plurality of connection balls and the connection member are assembled to obtain a variety of shapes.
Patent KR-20000050075-A (KR)
Inventor: KIM HYEONG YEONG
Filed: 2000-05-15
Abstract: PURPOSE: A method for a financial service using the Internet is provided to process every commodity information and financial service of a computer system of a financial agency in one site after constructing a virtual bank in a cyber space. CONSTITUTION: A method for a financial service by using the Internet, by connection of computer systems of a user, a virtual bank and a financial agency through a network, comprises the steps as follows. The user computer requests private credit information and investment commodities condition to the virtual bank. The virtual bank registers information requested by the user computer, and transmits information demanded by the user to each financial agency computer. The each financial agency computer retrieves their commodities, and transmit every information on commodities corresponding to an investment commodity condition requested by a user to the virtual bank. The virtual bank analyzes and classifies the information on commodities transmitted from each financial agency computer, and information on commodities which is optimum to a condition demanded by a user. The user computer checks provided information on commodities, and demanded commodities are applied to the virtual bank.
Patent KR-20000053983-A (KR)
Inventor: BAEUM COMMUNICATION CO LTD
IPC: G06Q50/20
Filed: 2000-05-16
Abstract: PURPOSE: A method for managing ordered-study based on study details is provided to identify study processes to manage the study processes according to student levels, by storing the study details according to the student levels to refer to study details by periods based on the study details, and by making students select study contents to output questions appropriate for the students. CONSTITUTION: A method for managing ordered-study based on study details comprises the steps of: if a students is not registered, receiving an application from the student to store member information in a member information database, and referring to the member database to make an existing member log in a computer, then making the member select study items and subjects; classifying the items and the subjects according to a level of the member, and performing study for the selected subjects to store a study result in a study details database as referring to a study database; referring to study details according to study periods, and study ranges to manage the study details, and outputting questions by the member to perform the ordered-study.
Patent KR-20010105090-A (KR)
Inventor: KIM HONG GI
Filed: 2000-05-19
Abstract: 본 발명은 외장 케이스로부터 텔레스코프식으로 이동 가능한 스피커를 구비하는 평면 패널형 영상 표시기기에 관한 것이다.  본 발명의 일 태양에 따르면, 평면 패널형 디스플레이부를 수납하는 외장 케이스와, 상기 외장 케이스의 양측면으로부터 내외측으로 이동 가능한 한 쌍의 스피커와, 상기 스피커를 상호 연동시키는 연동 기구를 포함하는 평면 패널형 영상 표시기기가 제공된다.  상기 연동 기구는 마주보고 배치된 스피커를 연동시킬 수 있도록 상호 연결된 다수의 커넥팅 로드와, 스피커를 서로 반대 방향으로 상시 가압하는 탄발 부재를 구비한다.  상기 커넥팅 로드는 상호 교차하는 방식으로 회동 가능하게 연결된 한 쌍의 제1 커넥팅 로드와, 한 단부가 상기 제1 커넥팅 로드의 각 단부에 연결되며 다른 단부가 스피커에 회동 가능하게 고정된 제2 커넥팅 로드로 구성되어 있다.  상기 탄발 부재는 한 단부가 일측 스피커에 고정된 압축봉과, 상기 압축봉의 다른 단부가 텔레스코프식으로 이동 가능하게 삽입되며, 다른 단부가 타측 스피커에 고정되고, 그리고 그 내부에 스프링이 배치된 실린더를 구비한다.
Patent KR-20010106682-A (KR)
Inventor: AHN NAK YOUNG
IPC: H04W4/06
Filed: 2000-05-22
Abstract: 본 발명은 휴대폰 사용자가 자신의 휴대폰 번호, 이력사항 및 요구사항을 미팅주선 사이트 운영회사에 등재하여 회원으로 가입하는 단계와, 상기 미팅주선 사이트 운영회사에서 상기 휴대폰 사용자의 이력사항 및 요구사항들을 각 요건 및 조건별로 분류한 후 상기 휴대폰 사용자의 휴대폰 번호를 그룹핑 하여 데이터 베이스화 하는 단계와, 상기 미팅주선 사이트 운영회사에서 상기 각 요건 및 조건별로 그룹핑 된 휴대폰 사용자들의 휴대폰 번호를 휴대폰 통신 서비스 운영회사에 제공하는 단계와, 상기 휴대폰 통신 서비스 운영회사에서 상기 미팅 주선 사이트 운영회사로부터 제공받은 상기 휴대폰 사용자의 휴대폰의 위치를 추적하여 위치가 근거리, 혹은 일정지역 안에 위치할 경우, 각 휴대폰 사용자(그룹핑 된 휴대폰 사용자)에게 미팅을 원하는 상대편이 근거리에 있음을 문자 메시지 또는 음성 메시지 등으로 알려 통화 여부를 확인하는 단계와, 상기 문자 메시지 또는 음성 메시지를 받은 휴대폰 사용자가 통화를 원할 경우 상기 휴대폰 통신 서비스 운영회사에서 휴대폰 사용자 쌍방 간에 통화할 수 있도록 하는 단계를 포함하여 이루어진 휴대폰 통신 서비스를 이용한 미팅 주선 방식을 제공한다.
Patent KR-20010020887-A (KR)
Title: Nonvolatile semiconductor memory device and method of manufacturing the same
Inventor: OKAZAWA TAKESHI
IPC: H01L27/115
Filed: 2000-05-24
Abstract: PURPOSE: To provide a nonvolatile semiconductor storage device having such a memory cell constitution that the variation of the shapes of memory cells, which are arranged adjacently to each other in a mirror image relation caused by the asymmetry between the sources and drains of the memory cells does not affect the apparent characteristics of the memory cells. CONSTITUTION: Only the electric current flowing through a floating gate having good characteristics is made detectable from the outside by performing writing and reading-out by using a memory cell constituted of two floating gate electrodes 131 and 132 which are arranged adjacently to each other so as to sandwich a source 16 offset from the floating gate electrodes 131 and 132 as one unit. At the time of writing, in addition, a storage density which is equivalent to that of the conventional memory cell or higher is realized by causing the above-mentioned one set of memory cells to not only store one bit, but also two ore more bits.
Patent KR-20010049427-A (KR)
Inventor: DAO MUNEO
IPC: A47B51/00
Filed: 2000-05-26
Abstract: PURPOSE: A liftable storage device is provided to make the surface of a bottom plate visible by increasing a lowering stroke of a storage rack. CONSTITUTION: A liftable storage device comprises the housing rack(17) which is disposed in the housing cabinet(11), rotating arms(13, 14) which freely liftable support the housing rack(17), a lifting support device(15) which rotatably supports the rotating arms(13, 14), and a drive means(36) which rotates the rotating arms(13, 14) disposed to either one of the lifting support device(15) forward and backward. The lifting support device(15) having the rotating arms(13, 14) for freely liftable supporting the housing rack(17) is equipped with the forward and backward rotating drive means(36), by which the free electrical lifting of the housing rack(17) without relying upon manpower is made possible.
Patent KR-20010096423-A (KR)
Title: Can drinking water
Inventor: KIM JUNG SOO
IPC: B65D17/00
Filed: 2000-06-05
Abstract: PURPOSE: A beverage can is provided to conveniently carry more than one kind of beverage in a single can and share the beverage with others sanitarily by dividing the can into two sections simply. CONSTITUTION: A beverage can includes a pair of can main bodies(1) in the shape of cylinder having a semicircular section for receiving beverage inside and mounted with an opening element(3) at a top surface respectively, and a lower cap(2) for inserting lower ends of the can main bodies after being coupled to form a cylinder having a circular section, wherein a ring band formed in the shape of ring, of which a side is opened, is mounted in the middle part of a peripheral surface of the can main bodies and an upper ring is mounted at upper parts of the can main bodies for fixing the upper parts after the coupling of the can main bodies.
Patent KR-20000054419-A (KR)
Inventor: LIM KWANG CHUL
IPC: B60K17/04
Filed: 2000-06-05
Abstract: PURPOSE: A power switching system of a power take-off is provided to mount each driving unit of a power switching shaft and an input gear directly to a transmission cover and to have a compact structure of a power switching system by installing a power transfer unit connected directly to a pump. CONSTITUTION: A vacuum device starts a driving unit(20) for an input gear to suck air in a housing(13). A spring(15) between the housing(13) and a spring case(14) is compressed thereof to pull a diaphragm(12) and to pull a power switching shaft(11) connected with the diaphragm(12). The driving unit(20) for an input shaft interlocks with the power switching shaft(11) to pull an extending portion(33b) integral with an input gear(33). Therefore, the input gear(33) is engaged with an output gear(32).
Patent KR-20010111836-A (KR)
Inventor: HWANG UI JEONG
IPC: H01J9/227
Filed: 2000-06-13
Abstract: 멀티-넥 음극선관의 제작에 적합하도록 전자총 중심 위치에 다수개의 노광원을 설치하고 다수개의 노광원에서 방출된 빛이 페이스 패널 내면에 고른 광량으로 도달하도록 하여 형광막 스크린의 막품질을 향상시킬 수 있도록 한 노광 장치 및 노광 방법에 관한 것으로서, 
     페이스 패널을 지지하는 패널 지지대와, 다수의 전자총 중심 위치에 각각 설치되며 각 노광원 사이의 페이스 패널 내면에서 겹침 구간이 발생하도록 빛을 조사하는 다수의 노광원과, 각각의 노광원에 제공되어 해당 노광원에서 방출된 빛의 경로를 전자빔 궤적과 동일하게 제어하는 다수의 노광 렌즈와, 각각의 노광 렌즈 전면에 제공되어 노광 렌즈를 통과한 빛의 위치별 투과량을 제어하면서 페이스 패널 내면에서 노광이 겹쳐지는 부분이 다른 부분과 동일한 광량을 유지하도록 겹침 부분에 대응하는 영역에서 감소된 광 투과 특성을 갖는 다수의 노광 필터를 포함하는 멀티-넥 음극선관용 노광 장치 및 이를 이용한 노광 방법을 제공한다.
Patent KR-20010007440-A (KR)
Inventor: KAWASHIRI YOSHITAKA
IPC: D06F39/10
Filed: 2000-06-20
Abstract: PURPOSE: To improve the efficiency of a washing work in a washing machine, reduce the amount of use of a detergent and decrease an environmental pollution due to a drainage by effectively using the property of an inorganic material with a purifying function such as charcoal (binchotan, a hard charcoal in Japan). CONSTITUTION: A purifier with which the drum of a washing machine is charged to purify washing water comprises an accommodation bag 12 made of lipophilic fibers and having a water flow property, inorganic material pieces 14 with a stain adsorbing function with which the accommodation bag 12 is filled and specific gravity adjusting pieces 16 for adjusting the specific gravity of all the purifier 10 to 0.9 to 0.93, which are uniformly mixed with the inorganic material pieces 14 and with which the accommodation bag 12 is filled.
Patent KR-20020000399-A (KR)
Title: Bank loan system through internet
Inventor: OH SEONG BAEK
Filed: 2000-06-24
Abstract: PURPOSE: A loan system using the Internet is provided to be capable of permitting loan directly after requesting to excellent consumers or consumers with existing deposits or installment deposits only through a certification process without a separate identity confirm process, thereby remarkably simplifying loan processes. CONSTITUTION: First, a consumer accesses to an Internet banking service. Then, the consumer accesses to an Internet loan service to select one of a credit loan or a loan on security due to his deposits. Next, the consumer confirms whether he agrees to loan provisions and credit information usage, etc. Then, if agreed, a loan request is prepared and a receipt account and a desired amount of money are input. Next, the loan qualification of the applicant is certified by searching the information of the applicant from a consumer DB, and a loan contract is identified. Finally, the loan money is input to the receipt account of the applicant.
Patent KR-20010098338-A (KR)
Inventor: SON YEONG GWON
IPC: G06F17/00
Filed: 2000-06-27
Abstract: 인터넷 사이트의 바탕화면 등록처리 방법이 개시된다. 본 인터넷 사이트의 바탕화면 등록처리 방법은 (a) 사용자 컴퓨터에 인스톨됨으로써 웹 브라우져에 소정의 바탕화면 등록처리 루틴을 링크시키는 단계와, (b) 사용자가 웹 브라우저를 실행하면 상기 소정의 바탕화면 등록처리 루틴을 기동하는 단계와, (c) 사용자가 특정 웹 사이트로 이동하면 해당 사이트 주소를 캡쳐하는 단계와, (d) 특정 웹 사이트로 이동한 이후에 소정 시간이 경과하였는지를 체크하는 단계, 및 (e) 특정 웹 사이트로 이동한 이후에 소정 시간이 경과하였으면 캡쳐된 사이트 주소를 상기 소정의 바탕 화면 등록 처리 루틴에 따라 바탕 화면에 아이콘으로 등록하는 단계를 포함하는 것을 특징으로 한다. 
     본 발명에 따르면 단 한번의 클릭만으로도 사용자의 바탕화면에 원하는 홈페이지의 사이트가 북마크됨으로써 컴퓨터 초심자에게도 쉽게 사용될 수 있고, 웹 사이트의 홍보, 웹 페이지의 뷰(view) 및 히트(hit) 수의 증가에도 기여할 수 있다는 효과를 이룰 수 있다.
Patent KR-20020004094-A (KR)
Title: Jig for free moment and it's measure device
Inventor: AHN KWANG WOO
IPC: G01D21/00
Filed: 2000-07-01
Abstract: PURPOSE: A jig for free motion is provided to obtain actual test/measured value under various conditions by exactly calculating coordinates and various data corresponding to three-dimensional motion. CONSTITUTION: A jig for free motion consists of: a rotation unit(10) having a rotatable shaft(15) installed under a fixed plate(11) and available for free rotation by bearings(16), and a rotatable plate(18) formed at the lower end of the rotatable shaft with free motion corresponding to rotation of an object; a forward/backward motion unit(20) having support plates(21) at both lower parts of the rotatable plate, a rotatable shaft having a rectangular sectional area available for rotation by a baring(22), and angular plates(24) mounted at both ends of the rotatable shaft to obtain free motion; a left/right motion unit having a rotatable shaft having a circular sectional area, rotatable plates(35) at both sides of the rotatable shaft and angular plates(34) mounted at both ends to obtain free motion; various application sensors mounted under an object fixing plate(36); a measuring unit for calculating various data from coordinates of the free motion of an object; and an actuator(60) operating the rotation unit, the forward/backward motion unit and the left/right motion unit artificially. The jig obtains free motion of all kinds of motion and positions. Therefore, various data of coordinates are calculated exactly.
Patent KR-20000063629-A (KR)
Inventor: LIM JAE KYONG
IPC: C09K3/12
Filed: 2000-07-26
Abstract: PURPOSE: A non-asbestos rope whose inside and outside are woven, is provided for packing and sealing the door of a smelting furnace or a coke open, with good heat resistance, elasticity and flexibility. CONSTITUTION: The non-asbestos rope whose inside and outside are woven is such that the interior core is made by twisting glass fiber 75 3/3 and glass fiber lobbing 1200 tex when it is waved to nilyang texture(6), and is composed of several strands according to the thickness; and the exterior surface is braided to braid texture (10) by twisting 16 strands of glass fiber 75 3/3 by two strands, and is re-braided to braid texture(12) to form double braid texture.
Patent KR-20010049940-A (KR)
Inventor: MATSUNO JUNICHI
IPC: H04N1/387
Filed: 2000-07-29
Abstract: PURPOSE: To provide a printed matter and a print system that can imbed attached information onto a base pattern in an invisible state and easily visualize the resulting pattern. CONSTITUTION: The additional information pattern is imbedded to the base pattern in an invisible state such that a step difference causing each stripe of a stripe pattern to be discontinuous is given at a border between a pattern of added information and the base pattern consisting of thin line stripes and a consecutive sequence of the step differences consisting of a plurality of the stripes at the border has a prescribed angle or over with respect to the direction of the stripes.
Patent KR-20020011814-A (KR)
Title: Method for Planarization of Insulating Film in Semiconductor device
Inventor: PARK GI JONG
IPC: H01L21/3105
Filed: 2000-08-04
Abstract: PURPOSE: A method for planarizing an insulation layer of a semiconductor device is provided to minimize the size of a pillar left in the periphery of the insulation layer by removing the insulation layer broader than the area of a pattern, and to reduce an absolute step between the upper portion and the peripheral portion of the pattern by eliminating the minimized pillar by a wet-etch process. CONSTITUTION: The insulation layer is formed on a semiconductor substrate(100) having the pattern(102) of a predetermined height. A photoresist pattern is formed on the insulation layer to expose only the planarized portion of the insulation layer in the upper portion having the pattern. A predetermined depth of the exposed planarized portion of the insulation layer is etched. The pillar formed in the inclined part of the insulation layer is eliminated by a wet-etch process. The remaining insulation layer is reflowed.
Patent KR-20020012460-A (KR)
Title: Method of Operating Non-capital Stock Investment Site for Magnetic Card
Inventor: KIM SEUNG WON
Filed: 2000-08-07
Abstract: PURPOSE: A method for operating a stocks site having no-budget for a magnetic card member is provided to supply an opportunity for making the corresponding members execute an actual stocks investment for a set period using no-budget on the Internet by creating an amount of money in proportion to a used credit card amount linked with no-budget stocks investment site or corresponded to a credit card commission as an investment capital. CONSTITUTION: Each member requests an issue of a wanted credit card by connecting to no-budget stocks investment site(S1). The no-budget stocks investment site transmits a credit card application form information of the member to a server of a VAN company/credit card company through an Internet network(S2). The VAN company/credit card company receives the credit card application form and transmits credit card issuing guide information to the corresponding member the Internet network, and transmits a credit card(S3). Each member may execute a cost payment in accordance with a wanted purchase or a service using in a credit card member store using one's credit card(S4). The credit card member store informs points for no-budget stocks investment to the corresponding member by a real time communication with the no-budget stocks investment site and the VAN company/credit card company through the Internet network(S5). The credit card member store transmits selling and point information of the corresponding member to a server of the VAN company/credit card company through the Internet network(S6). The server of the VAN company/credit card company approves and pays for the sale of the member and transmits point information to a web server(S7). The web server calculates and informs points of each member and supplies an opportunity in order for each member to execute no-budget stocks investment(S8,S9). An operator of the no-budget stocks investment site opens a stock company account using a stock investment capital allocated in each member and opportunity is provided in order for each member to perform a stock investment(S10,S11). The web server stores an investment result of each member in a database server(S12).
Patent KR-20020013081-A (KR)
Title: A process for preparing Eiprubicin and Pharmaceutically acceptable salt thereof
Inventor: CHOI JUN HO
IPC: C07H15/252
Filed: 2000-08-10
Abstract: PURPOSE: Provided is a process for preparing epirubicin and pharmaceutically acceptable salt thereof, thereby producing epirubicin in high yield and purity. CONSTITUTION: The preparing method of epirubicin represented by the formula(1) comprises the steps of: protecting 3'-amino group in saccharide region of doxorubicin to obtain a compound of the formula(2); ketalizing the compound of the formula(2) to obtain a compound of the formula(3); converting 4'- in saccharide region of the formula(3) to activated leaving group to obtain a compound of the formula(4); releasing the activated leaving group at 4'- to obtain a compound of the formula(5); hydrating 4'- in saccharide of the compound of the formula(5) to obtain a compound of the formula(6); and hydrating ketal derivative of aglycone to obtain a compound of the formula(1).
Patent KR-20000064016-A (KR)
Inventor: LEE DAE HUI
IPC: H05K7/02
Filed: 2000-08-16
Abstract: PURPOSE: A memory card connector is provided to obtain a connector which can be used as a micro flash card, a multimedia card, and a secure digital card by using both surfaces of the upper and lower portions of the connector. CONSTITUTION: A memory card connector comprises an upper portion, a lower portion, and a direction indicating surface(36). The upper portion comprises a connecting terminal(20) and a resilient piece(17) for electrically connecting a micro flash card to the connector, a catching piece(18) for engaging the lower portion, an engaging piece(21), and an engaging frame(35). The lower portion comprises an engaging recess(10) for engaging the lower portion with the upper portion, an engaging jaw(16), an engaging member(15), and right and left jaws(12) and a connecting terminal(14) for electrically connecting a multimedia card to a secure digital card. The insertion direction of the memory card is discriminated by the direction indicating surface(36).
Patent KR-20010077847-A (KR)
Title: Antenna device and assembly of antenna device
Inventor: AKIKAZU TOYODA
IPC: H01Q1/24
Filed: 2000-08-17
Abstract: PURPOSE: To reduce the manufacturing cost of an antenna system used for a mobile communication unit or the like. CONSTITUTION: This antenna system 1 is provided with a base 2, made of at least a dielectric or a magnetic body and having an upper face 21, a lower face 22 and a couple of side faces 23 on which recessed parts 231 and projections 232 are alternately formed and with conductor layers 3, 4, 5 that are formed on the upper and lower faces 21, 22 and the projections 232 or the recessed parts 23 of a pair of the side faces 23 of the base 2 and surround the base 2 into a spiral shape as a whole.
Patent KR-20020016291-A (KR)
Title: Hoist motor control method
Inventor: LEE JAE TAEK
IPC: H02P27/04
Filed: 2000-08-25
Abstract: PURPOSE: A hoist motor controlling method is provided to fast operate a hoist motor at a velocity higher than a regular velocity by detecting that load is less than a threshold during lifting up/down. CONSTITUTION: In a hoist motor controlling method, at a first step(10,11), it is determined whether a hoist motor is operated at a specific velocity. At a second step(12,13), if the hoist motor is operated at a specific velocity, it is determined whether a current operation mode flag is low velocity or high velocity after calculating output torque. At a third step(14), if the current operation mode flag is low velocity, the output torque is compared with a set value. At a fourth step(15), if the output torque is less than the set value, the operation mode flag is set to a high velocity and an output frequency of an inverter is varied to operate the hoist motor at a velocity higher than a regular velocity.