baber/WOPTO huggingface dataset:
Patent KR-20020045291-A (KR)
Title: Apparatus for a error compensation of acceleration in the car
Inventor: PARK MIN U
IPC: G01P21/02
Filed: 2000-12-08
Abstract: PURPOSE: An apparatus for correcting an error of an acceleration sensor of a vehicle is provided to measure correctly velocity of the vehicle by using an absolute acceleration value. CONSTITUTION: An acceleration sensor(10) is used for measuring acceleration of a traveling vehicle in order to predict an upper and a lower movement of the vehicle. An integrator(20) is used for integrating measured values of the acceleration sensor(10) in order to obtain velocity of the vehicle. An A/D converter(30) is used for converting a velocity value of the vehicle to a digital value. A set switch(50) is used for generating a signal for storing data in order to compensate an installing error of the acceleration sensor(10). A reset switch(60) is used for resetting an operation of a control portion(40). The control portion(40) is used for storing an error angle to a memory according to a signal of the set signal(50) and obtaining an absolute acceleration value.
Patent KR-20020045295-A (KR)
Title: Polishing pad controlling method for using chemical mechanical polishing equpiment
Inventor: KANG DEOK BONG
IPC: H01L21/304
Filed: 2000-12-08
Abstract: PURPOSE: A method for managing a polishing pad of a CMP(Chemical Mechanical Polishing) apparatus is provided to find an exchange period of the polishing pad by measuring the thickness of a planarizing layer. CONSTITUTION: A planarizing layer of a sampling wafer is polished during a predetermined time after the sampling wafer is fixed to a pressing head of a polishing apparatus(S200). The thickness of the polished planarizing layer is measured by a wafer layer measuring device and the measured value is transmitted to a control portion(S210). The control portion compares the measured value with a reference value(S220,S230). The control portion calculates a polishing time for the remaining planarizing layer if the control portion detects the remaining planarizing layer(S240). The remaining planarizing layer is polished by the polishing apparatus(S250). The control portion generates an alarm signal according to an exchange period of a polishing pad(S260).
Patent KR-20020045722-A (KR)
Title: Method and oil warning system for vehicle
Inventor: CHO SEONG HO
IPC: F01M11/10
Filed: 2000-12-11
Abstract: PURPOSE: A device and method for warning lack of oil of a vehicle is provided to sense oil level depending on a variation of temperature and warn lack of oil by installing an oil-temperature sensor to the valve body or the oil pan of an automatic transmission. CONSTITUTION: A device for warning lack of oil(2) of a vehicle includes an oil-temperature sensor(4), a control unit(6), and a warning light(8). The oil-temperature sensor is installed to an oil pan(10) or to a side of a valve body(12) in the oil pan. The control unit decides the oil temperature sensed through the oil sensor on the increase and decrease of oil quantity according to the preset information. The warning light is installed to the instrument panel and switches on a light by the signal of the control unit. Breakdown of the transmission or engine caused by lack of oil is prevented with warning lack of oil and durability is improved.
Patent KR-20020045902-A (KR)
Title: The clutch apparatus for VCR
Inventor: CHAE YU SEOK
IPC: F16D13/08
Filed: 2000-12-11
Abstract: PURPOSE: A clutch device of a magnetic recording player is provided to contact an inner surface of an upper end and an external surface of a lower end of a clutch spring with a gear holder of a lifting gear and a pulley holder of a driving pulley, respectively, to change a slip position according to a rotation direction of the driving pulley, thereby conveying a regular torque. CONSTITUTION: A pivot(62) is installed on a main chassis(50). A driving pulley(64) installed on the pivot inputs a dynamic force of a driving source to rotate, and has a cylinder pulley holder(66). A lifting gear(70) receives a dynamic force from the driving pulley, and rotates to output the dynamic force, then has a cylinder gear holder(76) having a smaller external diameter than an inside diameter of the pulley holder. The lifting gear is lifted along the pivot. One end of a clutch spring(80) is selectively contacted with an inner surface of the pulley holder, and the other end thereof is selectively contacted with an external surface of the gear holder, depending on a rotation direction of the driving pulley. The clutch spring conveys a regular torque to the lifting gear from the driving pulley.
Patent KR-20020047689-A (KR)
Title: Ligand and organo-metal precursor thereby
Inventor: HWANG EOK CHAE
IPC: C07C235/00
Filed: 2000-12-13
Abstract: PURPOSE: Provided are a ligand having a flexible structure which can provide an improved vapor pressure effect and have numerous substituents capable of imparting electric or steric effects on both ends of the ligand, and an organometallic precursor using the same. CONSTITUTION: The ligand is represented by formulae 1 to 5. Formula 1: R2OC(O)CHR1C(O)OR3; formula 2: R5C(O)CHR4C(O)R6; formula 3: R8OC(O)CHR7C(O)A; formula 4: R13(O)CHR12C(O)NR14R15; formula 5: R17R18NC(O)CHR16C(O)NR19R20. In the formulae, each of R1, R4, R7, R12, and R16 represents -((CH2)mO)nR'(wherein m is 2 or 3, n is 2-4, R' is an alkyl group having C1-C4), each of R2, R3 and R13 is an alkyl group having C1-C4, each R5, R6, R8, R14, R15, R19 and R20 is hydrogen, or a catenary or branched alkyl group having C1-C10, or a catenary or branched alkyl group substituted with an aryl group having C1-C10, and A represents formula 3a: -NR9R10 or 3b: -R11(wherein each of R9 and R10 is hydrogen, or a catenary or branched alkyl group having C1-C10, or a catenary or branched alkyl group substituted with an aryl group having C1-C10, R11 is an alkyl group having C1-C4).
Patent KR-20020049532-A (KR)
Title: Loading Equipment of Automobile Exhausting Pipe
Inventor: JUNG SEONG CHEOL
IPC: F01N3/00
Filed: 2000-12-19
Abstract: PURPOSE: A device for mounting an exhaust system is provided to absorb multi-directional vibration by using a buffer spring, and to mount the exhaust system regardless of position. CONSTITUTION: An exhaust pipe(10) is supported by the elasticity of a buffer spring(16) radially arranged on a supporting frame(12). The supporting frame(12) is mounted by a hinge pin(18). A supporting board(14) is installed on the end of the buffer spring(16), and supports the periphery of the exhaust pipe(10) by the elasticity of the buffer spring(16).
Patent KR-20020049759-A (KR)
Title: Method for processing packet data in mobile communication terminal
Inventor: HAN SEUNG UK
IPC: H04L29/02
Filed: 2000-12-20
Abstract: PURPOSE: An apparatus for processing packet data of a mobile telecommunication terminal and a method thereof are provided to relay data without IN change in a data terminal device(IWF) relaying the packet data between the data terminal device and a terminal like a notebook PC. CONSTITUTION: In a mobile telecommunication terminal device to relay packet data between an IWF and an external terminal, the apparatus includes the first protocol layer part being allocated with an IP by connecting the above IWF and a PPP(Point-to-Point) by driving a PPP protocol, and the second protocol layer part connecting the external terminal and the PPP by driving PPP protocol and allocating the allocated IP to the above external terminal. And a packet manager controls operations of the first and the second protocol layer part, and stores the IP allocated from the above IWF, and provides the stored IP to the first protocol layer part.
Patent KR-20020046125-A (KR)
Title: Counteraction/interception material of noxious waves and its intercepting method.
Inventor: BAE SUNG HAN
IPC: A61N1/16
Filed: 2000-12-12
Abstract: PURPOSE: Provided is a counteraction/interception material of noxious waves and its intercepting method, thereby effectively intercepting noxious wave from various electric/electronic appliances or water. CONSTITUTION: The counteraction/interception material of noxious waves from various electric/electronic appliances or water is prepared by collecting Laurus leaves and drying them; and packaging the dried Laurus leaves into a gauze type envelope. The intercepting method of noxious electric wave comprises placing an appropriate number of the dried Laurus leaves-containing envelope around the electric/electronic appliances, for example 1 to 2 sheets of Laurus leaves for a television or a monitor of a personal computer. The intercepting method of the noxious flowing underground veins comprises placing 1.5 to 2 sheets/3.3 m¬2 of the Laurus leaves on the floor where the flowing underground veins is passed through.
Patent KR-20020051745-A (KR)
Title: Tail gate for automobile
Inventor: AHN JUNG GYUN
IPC: B60J5/10
Filed: 2000-12-23
Abstract: PURPOSE: A tailgate for a vehicle is provided to improve space utilization by making the space under a tailgate very large when the tailgate is open by using a special extended door regardless of the size and height of the tailgate. CONSTITUTION: In a tailgate(T) for a vehicle coupled to the rear upper end of a vehicle by hinges, the tailgate includes an extended door(1) and a guide device. The tailgate has a handle(2) and a receiving portion. The extended door enlarges the size of the tailgate while the extended door is being received in the tailgate and withdrawn from the tailgate. The extended door is made of material having rigidity like plastics. The guide device has the extended door received in the tailgate and withdrawn from the tailgate. Therefore, the space utilization is improved.
Patent KR-20020052425-A (KR)
Title: Manufacturing method for pick-up lenses and loading fixture for the same
Inventor: LEE JONG YUN
IPC: G11B7/00
Filed: 2000-12-26
Abstract: PURPOSE: A method for fabricating an optical pickup lens and a jig for loading are provided to load many optical pickup lenses inserted in a lens carrying jig on a lens carrying jig for coating at one time, using the loading jig. CONSTITUTION: A lens injecting step(S100) injects an optical pickup lens injection. A lens cutting step(S200) automatically cuts optical pickup lenses from the optical pickup lens injection, and inserts the optical pickup lenses on a lens carrying jig. In a lens loading step(S300), a jig setting step(S301) mounts the lens carrying jig on a carrying jig mounting part and mounts a lens inserting jig for coating on a coating jig mounting part. And a lens loading step(S302) loads the many optical pickup lenses on the coating lens inserting jig. In a lens coating step(S400), a jig loading step(S401) loads the coating lens inserting jig having the optical pickup lenses. A vacuum generating step(S402) forms a vacuum in a coating chamber for coating the optical pickup lenses. A front coating step(S403) completes coating of the front of the optical pickup lenses. A reversing step(S404) rotates the coating lens inserting jig at an angle of 180 degrees. A rear coating step(S405) automatically coats the rear of the optical pickup lenses. A vacuum destructing step(S406) destructs the vacuum of the coating chamber. And a jig unloading step(S407) unloads the coating lens inserting jig. A packing and shipping step(S500) investigates the coating-completed optical pickup lenses for packing and shipping.
Patent KR-20020054115-A (KR)
Title: System and method for security evaluation of internet host system
Inventor: HYUN JEONG SIK
IPC: G06F17/00
Filed: 2000-12-27
Abstract: PURPOSE: An internet host system security evaluation method and system is provided to identify a protocol from packet data generated for offering a function of a packet security at an internet host system, to collect the packet data, and to extract risk elements from the packet data. CONSTITUTION: The system comprises a system configuration block, a database control block, and a rule interpreter block. The system configuration block performs a user authentication by a manager having a management right, and registers data on an agent performed at a remote host and data on a module performed by an evaluation rule. The database control block generates a table on the data transmitted by the agent, adds data, defines an assessment evaluation rule at rule data, modifies the assessment evaluation rule or erases the evaluation rule from the rule data. The rule interpreter block reads the evaluation rule, defined at the database management block, from the rule data, analyzes instructions according to an execution procedure, and executes the evaluation rule. The system includes a GUI(Graphic User Interface) diagram and a socket handler. The GUI diagram enables a manager to set overall elements needed for an assessment via a JAVA interface. The socket handler enables the agent and the execution module to transmit data over a network.
Patent KR-20020058247-A (KR)
Title: Fuel and oil pouring gate protector for industrial vehide
Inventor: HWANG JUN HA
IPC: B60K15/05
Filed: 2000-12-29
Abstract: PURPOSE: A device for protecting a fuel and oil supply hole of an industrial vehicle is provided to protect a fuel and oil supply hole from external shock by mounting a cover and a locking part, and to prevent a forced opening by an outsider by making locking of a cover be released from the inside of a car body. CONSTITUTION: A device for protecting a fuel and oil supply hole of an industrial vehicle includes a cover(10), a spring(30), and a locking part. The cover is mounted on a car body(1) to be rotated between a blocking location for blocking an upper portion of a fuel and oil supply hole(3) and an opening location for opening the upper portion of the fuel and oil supply hole. The spring elastically supports the cover in a direction of the opening location. The locking part locks the cover or release the locking of the cover at the blocking location.
Patent KR-20010022094-A (KR)
Title: 원격 스테이션과 통신하도록 기지국을 선택하는 방법 및장치
IPC: H04W48/20
Filed: 1998-07-21
Abstract: 기지국 제어기(6)에 의하여 제어되는 다수의 기지국94)을 포함하는 통신 시스템에 이용되는 이동국92)은 후보 기지국 세트를 포함하는 다수의 기지국으로부터의 신호를 수신하는 수신기(50, 52, 54)를 포함한다.  이동국은 수신된 신호의 파워를 결정하며 제 1임계값과 비교한다.  이동국(2)은 제 1임계값보다 큰 수신 파워를 가진 신호를 가진 기지국(4)을 식별하며 애에 포함되기에 적합한 식별된 기지국을 나타내는 신호를 제어기(6)에 전송한다.  후보 세트의 각각의 파일럿의 측정된 파일럿 에너지는 액티브 세트의 파일럿 에너지의 합에 따라 발생된 임계치와 반복적으로 비교된다.  후보 세트의 가장 강한 파일럿이 임계 조건을 만족하면, 수정된 액티브 세트에 추가된다.  제 2의 반복 프로세스는 파일럿이 수정된 액티브 세트로부터 탈락될 것인지를 결정하기 위하여 수행된다.  이동국(2)은 액티브 세트와 후보 세트의 파일럿의 에너지를 측정함으로써 그리고 통신환경에 대한 자신의 추정치를 기초로 필요한 임계치를 동적으로 조정함으로써 현재 액티브 세트에 대한 변화가 적정한지를 결정한다.
Patent KR-20010023314-A (KR)
IPC: G03F7/20
Filed: 1998-08-26
Abstract: 노광용 광원(100)으로부터의 노광광을 조명 광학계(200)를 거쳐서 레티클 R에 조명하고, 그 패턴의 화상을 투영 광학계(300)에서 감광 기판 W상에 투영하는 노광 장치는 투영 광학계(300)를 수용하는 경통 LB내의 광학 소자간에 형성된 공간(310, 311)에 불활성 가스를 충전하는 가스 공급 장치(150)와, 공간내의 압력을 검출하는 압력 검출기 PS2, PS3과 압력 검출기 PS2, PS3에 의해 검출된 압력에 따라 투영 광학계(300)의 광학 성능을 조절하는 광학 성능 조절 장치(303, 304)를 구비한다. 광학 성능 조절 장치는 한쌍의 광학 소자간의 거리를 조절하는 장치, 또는, 광학 소자간의 공간의 압력을 조정하는 장치이다.
Patent KR-20010024182-A (KR)
IPC: B65B21/24
Filed: 1998-09-21
Abstract: An apparatus and method for continuously loading different types of cartons with articles delivered to the apparatus from an infeed stream of a packaging machine. The apparatus (50) comprises conveying means sequentially to deliver successive cartons (10) from a supply and to load said carton by lowering said carton onto at least one article. The conveying means comprises a plurality of carton engaging means (64) mounted to respective ones of a pair of endless chains (52, 54), wherein the carton is held between synchronised carton engaging means to maintain the carton in a set up condition as it is moved downstream. Adjustment means is provided to adjust one of said pair of endless chains relative to the other said endless chain to receive a different carton type.
Patent KR-20010024535-A (KR)
Title: 초냉동 재료를 선적하는 방법 및 장치
IPC: B65D88/74
Filed: 1998-10-16
Abstract: 본 발명은 제품 또는 재료를 토냉동 상태로 냉동시켜, 이들을 선적할 때까지  저장하고, 초냉동 상태로 선적하는 방법 및 장치에 관한 것이다.  본 발명에 따르는 장치는 두 일체완비형, 초절연성 컨테이너로 이루어진다.  제1 장치는 적어도 두 개의 격실로 구성되어 있어, 그 중 하나는 냉동용이고 다른 하나는 저장용이다. 냉동시킨 제품 및 재료는 냉동 격실에 넣어서 초냉동 상태로 냉동시킨 다음 선적할 때까지 저장할 저장 격실에 옮긴다.  제2 장치는 일체완비형 초절연 선적 컨테이너이다.  선적할 경우, 제품 또는 재료를 제1 장치의 저장 격실로부터 제2 또는 선적 장치로 초냉동 상태에서 옮긴다.  선적 장치의 문이 닫히고, 초냉동 제품 및 재료를 담은 일체완비형, 초절연 장치는 원격 목적지로 선적된다.
Patent KR-20010024776-A (KR)
Title: 에어로졸 캔용 알루미늄 합금
IPC: C22C21/12
Filed: 1999-01-20
Abstract: 본 발명은 구리와 망간을 포함하는 합금에 관한 것으로, 합금 내의 Cu 및 Mn 조성은, 좌표축 중 가로축을 Mn 함유량(중량%)으로 하고 세로축을 Cu 함유량(중량%)으로 하는 좌표계에서 하기 표 1에 기재된 좌표점 A, B, C 및 D로 한정되는 다각형 ABCD 내에 포함되며, 나머지 조성은 Al 및 피할 수 없는 불순물로 이루어지는 것을 특징으로 한다. 
     표 1 
     
       
         
             
                   
                 가로축(Mn %) 
                 세로축(Cu %) 
               
                 A 
                 0.075 
                 0.65 
               
                 B 
                 0.50 
                 0.65 
               
                 C 
                 0.35 
                 0.4 
               
                 D 
                 0.25 
                 0.4
Patent KR-20010033550-A (KR)
Title: 압축 비디오 시퀀스들의 부분 디코딩
IPC: H04N7/30
Filed: 1998-12-22
Abstract: 본 발명은 (예를 들어, DCT) 변환을 이용하여 생성된 압축 비디오 시퀀스들이 인코딩된 비트 스트림으로부터 저주파 변환 계수들(예를 들어, DC 계수들만)을 복원(204)하기 위하여 부분적으로 디코딩(202)되는 것에 관한 것이다.  그 다음에, 저주파 계수들은 비디오 분해에 대한 히스토그램 분석(208)과 같은 연속적인 프로세싱을 위해 사용될 수 있는 부분적으로 디코딩된 이미지들을 생성하기 위해 움직임이 보상된 프레임간 가산(206)되는 이미지 데이터 블록들을 생성하기 위해 사용된다.  본 발명은 계산시 비용이 많이 드는 역 변환 연산들을 수행해야 하는 것을 방지하는 한 편, 계속해서 만족스런 결과를 갖는다.
Patent KR-20010041056-A (KR)
Title: 내연 기관용 제어 시스템
IPC: H01R13/66
Filed: 1999-01-18
Abstract: 본 발명의 내연 기관용 제어 시스템에 관한 것이다.  상기 내연 기관용 제어 시스템은 모터 제어 장치(1) 및 모터 제어 장치를 위한 인터페이스(2)를 갖는 센서를 포함한다.  상기 인터페이스에는 상기 센서의 측정값을 디지털화하기 위한 평가 장치(211)가 통합된다.
Patent KR-20010071233-A (KR)
Title: 자기 테이프 카트리지
IPC: G11B23/04
Filed: 1999-05-07
Abstract: 평탄한 상면 및 하면을 구비한 편평한 카트리지 케이스 내에 자기 테이프를 감은 단일의 릴이 회전 가능하게 수용되어 이루어진 자기 테이프 카트리지에 있어서, 자기 테이프 카트리지의 외부 기록 재생 장치로의 삽입 방향 X에 관하여 카트리지 케이스(7)의 하면의 리딩 측 및 트레일링 측의 엣지 근방에 적어도 3개의 섬 형상 내지 점 형상의 볼록부(11)를 형성하는 동시에, 카트리지 케이스(7)의 상면에 적층 시에 위쪽에 배치되는 카트리지 케이스(7)의 볼록부(11)가 맞물릴 수 있는 오목부(12)를 형성하여, 자기 테이프 카트리지의 복수개를 적층시켰을 때의 위치 어긋남을 방지하며, 이 자기 테이프 카트리지를 기록 재생 장치에 삽입할 때의 슬라이딩 저항을 감소시킨다.
Patent KR-20020057455-A (KR)
Title: Heatsink
Inventor: LEE JAE GWANG
IPC: H01L23/34
Filed: 2001-01-05
Abstract: PURPOSE: A heat sink is provided to prevent a leg for fixing a heat sink to a substrate from floating or being warped, by including one of a pipe-type screw coupling part or leg settling part having a protrusion or all of the two. CONSTITUTION: A heat sink body(20a) radiates heat. The leg settling part(20c) is inserted into the side surface of the heat sink body, vertical to a circuit board. A hole of a predetermined type and a groove of a predetermined type are formed in the leg settling part to settle a leg(21) fixed after the leg settling part is coupled to the circuit board. The leg settling part has a protrusion(20c') surrounding the leg of a pin type. The leg is settled in the leg settling part.
Patent KR-20020062060-A (KR)
Title: A Method for Manufactuting Artificial Marble Using Slag
Inventor: KIM SEUNG YEUL
IPC: C04B18/02
Filed: 2001-01-19
Abstract: PURPOSE: Provided is a manufacturing method of artificial marble with high far infrared emission, sterilization and beautiful surface in a low coat by using steelmaking slag. CONSTITUTION: The manufacturing method is as follows: mixing 60-70wt.% of slag powder(<=5mm) as a filler with 10-20wt.% of gabasite powder(<=5mm); sintering at 600-850deg.C; grinding to 1mm-150mesh; adding 5-15wt.% of water glass and/or 5-10wt.% of acryl resin as a binder, and optionally coloring agent such as Cr2O3; pressing; sintering at 950-1050deg.C; and polishing.
Patent KR-20020062097-A (KR)
Inventor: KIM SEONG JIN
IPC: A63B23/00
Filed: 2001-01-19
Abstract: PURPOSE: An exercise device for performing vertical exercise by putting both shoulders on a rubber belt, standing on one's hands and then swing is provided which enables a user to do a handstand without possessing anxiety on laying one's body upside down. CONSTITUTION: This exercise device comprises: a cover(1), frame(2,3,4,5,6), foot plat(7), spring(8), spring supporter(10), spring rod(11), shaft(12), abdomen contact roll(13), bearing(14), rubber belt(15) and bolt(16). For taking vertical exercise, the abdomen is placed on the abdomen contact roll, both hands are placed on the rubber belt(A,B). By the weight of user's body, rods placed under the rubber belt can be caught with both hands of the user, and allowing the head to be placed between the rubber belt causes both shoulders to be put on the rubber belt. Whenever pulling the rods with hands, up-and-down motion of the body is repeatedly achieved.
Patent KR-20010078059-A (KR)
Title: A semiconductor device
Inventor: HISANO NAE
IPC: H01L23/50
Filed: 2001-01-26
Abstract: PURPOSE: To provide a plastic molded semiconductor device wherein strength reliability is ensured in a plastic molded semiconductor device using a lead (lead frame), heat dissipating property is improved, and disconnetion of a bonding wire, decrease of life of a soldered connection part, resin cracks, etc., are prevented. CONSTITUTION: Material is used whose main component is composite alloy of Cu2O and Cu which is sintered so as to have a coefficient of linear expansion small as compared with that of copper alloy, while high thermal conductivity equivalent to that of copper alloy which has been used as lead material is ensured.
Patent KR-20010083152-A (KR)
Title: Program development apparatus, program development method, storage medium storing program development program and program development program
Inventor: NUMATA KENJI
IPC: G06F11/22
Filed: 2001-01-31
Abstract: PURPOSE: To inspect an optical processing of a target program in an optional order without using the hardware of a target system easily and in short time. CONSTITUTION: This program development device to be disclosed is constituted by providing a generator 6 and a complier 9 to generate a program and an event pseudo generation routine on the basis of a state transition matrix and event pseudo generation information, an evaluation chip to execute emulation of the program and the event pseudo generation routine and an analyzing part 12 to start the emulation of the program from a state that the program is inputted as an initial condition and to so simultaneously rewrite, by referring to the event pseudo generation information, information to perform pseudo generation of an event stored in a RAM to be used in the case of execution of the event pseudo generation routine to information corresponding to the event the generation of which is instructed.
Patent KR-20020064520-A (KR)
Title: Electric kick board
Inventor: PARK MOUNG GYU
IPC: B62M11/00
Filed: 2001-02-02
Abstract: PURPOSE: A motor kick board is provided to move conveniently without fatigue by installing an electric motor driven by a battery in a wheel of the kick board, and to use comfortably by reducing noise. CONSTITUTION: A motor kick board is composed of a vertical frame(11) fixing a handle bar(15) including a handle(77) in the upper part, and mounting a front wheel(29) in the lower part; a footboard(13) connected to the vertical frame; a rear wheel assembly(29) installed in the rear part of the footboard to support the rear end of the footboard; a battery(19) supplying electricity to the rear wheel assembly through a cable; and a switch(17) installed between the battery and the rear wheel assembly to control supply of electricity from the battery to the rear wheel assembly. The cylindrical rear wheel assembly generates torque by receiving power, and has a wheel in the outer periphery. The kick board is used conveniently, and noise is reduced with installing the motor in the wheel.