baber/WOPTO huggingface dataset:
Patent KR-20110087035-A (KR)
Title: Single crystal grower, manufacturing method for single crystal, and single crystal ingot and wafer manufacturied by the same
Inventor: KIM SE HUN
IPC: C30B15/20
Filed: 2010-01-25
Abstract: PURPOSE: A monocrystal growing apparatus and a monocrystal growing method are provided to use a method to easily control oxygen dissemination when separating a residual melt volume using a magnetic field, thereby enabling the efficient control of low oxygen, a crystal length direction, and a wafer in-plane oxygen deviation. CONSTITUTION: A monocrystal growing apparatus includes a crucible and a magnet. The crucible is able to hold melt. The magnet is separated from the crucible and installed in the circumference of the crucible. The location of a magnet is controlled according to a ratio α of residual melt volume which is varying depending on the growth of a monocrystal ingot. The position of the magnet is determined by setting the ratio α of residual melt volume as 0.3 to 0.6. The ratio α equals to Va divided by Vt, here Vt is a total residual volume of the melt and Va is a residual volume of melt in a region higher than a maximum gauss position(MGP).
Patent KR-20110087146-A (KR)
Title: Culture medium comprising urease-producing microorganism and method for making it
Inventor: KIM JONG RYEOL
IPC: C12N1/20
Filed: 2010-01-25
Abstract: PURPOSE: A method for preparing a medium containing urease-producing microorganisms is provided to convert an unstable organic material into a stable organic material. CONSTITUTION: A method for preparing a medium containing urease-producing microorganisms comprises: a step of spray-drying an unstable organic material containing urea for pulverizing; a step of culturing the microorganism in a liquid medium; a step of spray-inoculating the microorganisms in the pulverized organic material; and a step of freeze-drying the organic material and microorganisms. The unstable organic material is waste oil, food waste, sludge, animal excreta, or agricultural or food process waste. The urease-producing bacteria are Sporosarcina pasteurii.
Patent KR-20110087522-A (KR)
Inventor: YOO WON IL
IPC: F04D29/08
Filed: 2010-01-26
Abstract: PURPOSE: A compressor with a thrust reduction function is provided to prevent an oil leak and an unstable pressure change by inserting the end of an impeller inside a seal part. CONSTITUTION: A compressor with a thrust reduction function comprises a casing(12), a rotary shaft(14), a bearing(20), and an oil slinger(18). An oil tank(22) and an impeller(16) are arranged inside the casing. The rotary shaft, coupled to the impeller, is installed inside a casing. The bearing is coupled to the rotary shaft and is rotated. The oil slinger is arranged between the impeller and the bearing and is coupled to the rotary shaft. A seal part(24) between the bearing and the impeller is coupled to the oil slinger. The end of the impeller is inserted into a housing unit formed on one surface of the seal part.
Patent KR-20110088757-A (KR)
IPC: H04B1/38
Filed: 2010-01-29
Abstract: 본 발명은 이동통신단말기에 관한 것으로서, 전파 수신 등의 필요에 따라 안테나와 메인PCB가 접속 또는 개방되도록 구성한 안테나 접속부를 제공하는 데 그 목적이 있다. 
상기와 같은 목적을 달성하기 위한 본 발명의 이동통신단말기의 안테나 접속부는 이동통신단말기의 이동체가 본체에 움직일 수 있게 결합되며, 상기 이동체의 움직임에 의해 접속부가 안테나와 PCB를 접속하거나 개방하도록 장착된 것을 기술적 특징으로 한다.
Patent KR-20110090427-A (KR)
Title: System and method for offering customized 3d moving picture
Inventor: LEE BOO HYUNG
IPC: G06Q50/10
Filed: 2010-02-03
Abstract: PURPOSE: A three dimensional customized experience video manufacturing system and service method thereof are provided to configure three-dimensional content through a three-dimensional technique. CONSTITUTION: A pre-registration unit(10) inputs physique information including visitor information including the image information. A three-dimensional converting unit(20) stores a three-dimensional image from the pre-registration unit. A conditional selecting unit(30) selects a video production condition including a scenario, a background image, an avatar and a video.
Patent KR-20110091052-A (KR)
Title: Life evaluation system and its method
Inventor: CHOI HYUN SUN
IPC: G06T7/60
Filed: 2010-02-05
Abstract: PURPOSE: An apparatus for evaluating lifetime of a facility by metal structure analysis is provided to analyze remaining lifetime according to the kind of carbide. CONSTITUTION: An apparatus for evaluating lifetime of a facility comprises: an image processing block(100) which measure a plurality of metal structure images according to the kinds of carbide; an information analysis block(200) for analyzing based on the distribution ratio, distance between the particles, and particle size and shape; and a lifetime evaluation block(300).
Patent KR-20110091208-A (KR)
Inventor: HUH DONG CHAN
IPC: B67B7/40
Filed: 2010-02-05
Abstract: PURPOSE: A safety can opener is provided to open an upper part of a can container safely with small power of a user by rotating a cutting control plate having a plurality of blades on a lower part. CONSTITUTION: A safety can opener comprises a can holder(4) and a cutting control plate. The can holder is gripped in one hand of a user to surround the outer circumference of the upward protrusion of a can container. The cutting control plate is located on top of the can container while adhering closely to one side of the can holder. The cutting control plate is rotated to cut the upper part of the can container by the blades of the lower part, while being gripped by one hand of the user.
Patent KR-20110094540-A (KR)
Title: Product and method of functional greentea or cla oil
Inventor: LEE JEONG OK
IPC: A23D9/02
Filed: 2010-02-17
Abstract: PURPOSE: Functional edible oil using green tea and carthamus seeds, and a producing method thereof are provided to secure the excellent productivity compare to a conventional compression method. CONSTITUTION: A producing method of functional edible oil using green tea and carthamus seeds comprises the following steps: crushing green tea leaves or seeds, and the carthamus seeds; mixing the crushed mixture with nucleic acid, alcohol, or their mixture, and reflux-extracting the mixture; removing a solvent from the extract; and diluting the obtained functional edible oil with conventional cooking oil.
Patent KR-20110095619-A (KR)
Title: Joint reinforcing method using bending connection member and bridge construction method therewith
Inventor: KIM JAE HEUNG
IPC: E01D22/00
Filed: 2010-02-19
Abstract: PURPOSE: A method for reinforcing the joint of a precast prestressed concrete beam using a bending connection member and a bridge construction method using the same are provided to improve the structural stability of a PSC girder using precast segments. CONSTITUTION: A method for reinforcing the joint of a precast prestressed concrete beam using a bending connection member is as follows. Bending connection members(200) are installed by horizontally passing through both ends of precast segments(100a,100b) of a PSC girder. Longitudinal connection members are installed by connecting both ends of the precast segments. Longitudinal and horizontal compression prestress is applied to the connection parts of the precast segments.
Patent KR-20110098159-A (KR)
Title: 원료 석탄 파쇄 장치
Inventor: PARK BYUNG CHEOL
IPC: B02C13/04
Filed: 2010-02-26
Abstract: 본 발명은 원료 석탄 파쇄 장치에 관한 것으로, 파쇄기(20)와, 원료 석탄(1)의 입도를 측정하는 입도측정기(30)와, 상기 입도측정기(30)에서 측정된 입도에 따라 상기 파쇄기(20)의 작동 강도를 조절하는 제어유니트(40)를 포함한다. 
따라서, 상기 파쇄기(20)가 상시 같은 강도로 구동되지 않고 천천히 구동되는 시간이 증가하므로 전력 소비량이 감소되는 효과가 있다.
Patent KR-20110101396-A (KR)
Inventor: JU HYEONG JONG
IPC: H04W16/32
Filed: 2010-03-08
Abstract: 본 발명은 소형 기지국에 관한 것으로 소형 기지국의 전력 관리 방법에 있어서 폐쇄 억세스 모드 하에서 가입된 단말이 오프된 소형 기지국을 가지는 매크로 기지국에 진입함을 알리는 통지 메시지를 상기 매크로 기지국으로부터 수신하는지 결정하는 과정과 상기 통지 메시지를 수신하는 경우, 상기 가입된 단말에 서비스를 제공할 수 있는지 결정하는 과정과 상기 가입된 단말에 서비스를 제공할 수 있는 경우 상기 소형 기지국을 온하는 과정을 포함하는 것으로 폐쇄 억세스 모드에서　소형 기지국 주변에 서비스를 지원해야 할 단말이 없을 때 소형 기지국을 온 함으로써 불필요하게 발생하는 간섭 및 전력 소모를 줄일 수 있고 개방 억세스 모드에서 매크로 셀의 부하가 많을 경우에, 소형 기지국 주변에 서비스를 지원해야 할 단말이 없을 때 소형 기지국을 온함으로써 불필요하게 발생하는 간섭 및 전력 소모를 줄일 수 있는 이점이 있다.
Patent KR-20100106242-A (KR)
Title: Nonaqueous secondary battery
Inventor: TODE SHINGO
IPC: H01M4/525
Filed: 2010-03-22
Abstract: PURPOSE: A non-aqueous electrolyte secondary battery is provided to secure the excellent load discharging property by the low impedance during a charging process, and to offer the high capacity of the secondary battery. CONSTITUTION: A non-aqueous electrolyte secondary battery comprises the following: a positive electrode formed with an electrode material layer including a positive electrode active material, a binder, and a conductive material; and a negative electrode including a negative electrode active material capable of absorbing and discharging lithium. The positive electrode active material is formed with a lithium transition metal composite oxide with a layered structure.
Patent KR-20110106659-A (KR)
Inventor: LEE MAN KYU
IPC: A61M5/20
Filed: 2010-03-23
Abstract: 본 발명은 주름이나 여드름 제거 등의 치료를 위한 멀티홀 시술시 바늘의 삽입 깊이를 정확하게 잡아주는 가이드에 관한 것이다.  
본 발명은 버큠 기능에 의해 불균형한 피부가 당겨지도록 하여 시술부위의 피부를 평평하게 만들어주고, 또 바늘에 의해 피부가 눌리는 현상을 막아줌으로써, 사용자가 의도한 바늘의 삽입 깊이를 정확하게 맞출 수 있는 등 정확한 니들링 깊이를 구현할 수 있는 한편, 가이드의 안쪽 피부에 쿨링 에어를 뿜어 주어 순간적으로 피부를 냉각시킴으로써, 바늘이 피부를 뚫을 때 통증을 감소시킬 수 있는 멀티홀 시술용 건 가이드를 제공한다.
Patent KR-20100109848-A (KR)
Title: Radiation-sensitive resin composition, interlayer insulating film and method for forming the same
Inventor: NISHI NOBUHIRO
IPC: G03F7/022
Filed: 2010-03-25
Abstract: PURPOSE: A radiation sensitive resin composition, an inter-layer insulating film using thereof, and a formation method thereof are provided to rapidly plasticize the resin composition at the low temperature, and to secure the high radio-sensitivity. CONSTITUTION: A radiation sensitive resin composition contains the following: an alkali soluble resin of a copolymer formed by copolymerizing a monomer containing unsaturated carboxylic acid or unsaturated carbonic anhydride, and an epoxy group-containing unsaturated compound; a 1,2-quinonediazide compound; and a compound including more than two mercapto groups, marked with chemical formula 1. In the chemical formula 1, R1 is a methylene group, an alkylene group with 2~10 carbons, or an alkyl methylene group.
Patent KR-20110108505-A (KR)
Inventor: PARK JONG MAN
IPC: H04W48/18
Filed: 2010-03-29
Abstract: 본 발명은 이동통신 시스템에서 데이터 다운로드를 위한 방법 및 장치에 관한 것으로서, 데이터 다운로드를 위한 단말의 방법은, 서버로부터 전송 데이터의 존재를 알리는 메시지를 수신하는 과정과, 상기 수신된 메시지에 포함된 전송 데이터의 양에 따라 접속할 네트워크를 결정하는 과정과, 상기 결정된 네트워크를 통해 데이터 연결을 수행하는 과정과, 상기 서버로부터 해당 데이터를 수신하는 과정을 포함하여, 소량의 데이터 다운로드 시 2G 네트워크를 통해 다운로드를 수행하도록 하여 상기 이동통신 단말기가 다운로드를 완료한 후, 해당 데이터 연결을 바로 해제하여 전류 소모를 감소시킬 수 있다.
Patent KR-20110116540-A (KR)
Inventor: LEE DONG HEE
IPC: C08G61/02
Filed: 2010-04-19
Abstract: 본 발명은 환형 올레핀계 수지 필름 및 이의 제조방법에 관한 것으로, 구체적으로는 가교도를 적정수준 이상으로 향상시켜 필름의 열팽창계수를 현저하게 개선시키는 장점이 있다.
Patent KR-20100049527-A (KR)
Title: Led driving circuit
Inventor: KIM SOO RYEOL
IPC: H05B37/02
Filed: 2010-04-22
Abstract: PURPOSE: An LED(Light Emitting Diode) driver circuit is provided to improve a power factor by enabling an input current to flow through all phase regions. CONSTITUTION: An LED driver circuit comprises a rectifier circuit, a voltage detection circuit, and a plurality of LED modules. The rectifier circuit rectifies an input AC voltage. The rectifier circuit is a bridge diode circuit. The peak value of an output voltage of the rectifier circuit is partitioned into a plurality of voltage regions(V1,V2,V3,Vp). The voltage level detection circuit detects the output voltage of the rectifier circuit belongs to which voltage region. A plurality of LED modules are operated in a plurality of voltage regions, respectively. A constant current circuit is serially connected to a plurality of LED modules.
Patent KR-20110119894-A (KR)
Title: Apparatus for marking rough line for nonskid in road
Inventor: LEE YOUNG NAM
IPC: E01C23/02
Filed: 2010-04-28
Abstract: PURPOSE: An anti-skid joint molding device is provided to control a forming angle of joint depending on kinds of paving material. CONSTITUTION: An anti-skid joint molding device comprises a body frame(100), a joint forming frame, a frame elevating device(300), a needle fixture, and a molding needle. The body frame is supported with a mobile tool(130) moving on the ground. The joint forming frame is installed on the lower part of the body frame. The frame elevating device has one end, which is connected to the body frame, and the other end, which is connected to the joint forming frame, in order to ascend and descend the joint forming frame. The molding needle is fixed to the needle fixture.
Patent KR-20110120498-A (KR)
Title: Method and apparatus for mapping of ack/nack channel for supporting sdma downlink control channel in ofdm system
Inventor: JI HYOUNG JU
IPC: H04W72/04
Filed: 2010-04-29
Abstract: PURPOSE: A method for mapping an uplink ACK(Acknowledgement)/NACK(Non-Acknowledgement) channel for supporting a spatial division multiplexing control channel and an apparatus thereof are provided to enhance the efficiency of resources using an independent uplink ACK / NACK response channel. CONSTITUTION: A system determines RB resources which is used for uplink ACK(Acknowledgement)/NACK(Non-Acknowledgement) resources. One PRB(501) is composed of a combination of 3 orthogonal covers(503) and 12 cyclic shifts(502). The ACK / NACK resources total 36 and are allocated to one PRB(Physical resource Block). A base station minimizes interference between neighboring ACK / NACK channels by determining cyclic shift distance between the neighboring ACK / NACK channels in consideration of the delay spread of the channels. The ACK / NACK channels are formed in an allocated PRB. The ACK / NACK resources which are allocated according to the CCE(Control Channel Emement) of PDCCH(Packet Data Control Channel) is mapped in the resources.
Patent KR-20110120564-A (KR)
Title: Face cleansing apparatus
Inventor: KWON YEON SIK
IPC: A47K1/00
Filed: 2010-04-29
Abstract: PURPOSE: A face washing apparatus is provided to enable a user to remove bubbles and foreign materials from the skin of his/her face by bringing his/her face into contact with the inside of a bowl. CONSTITUTION: A face washing apparatus comprises a controller(110) and a face washing pad(120). The controller rotates an impeller connected to an electric motor by driving the electric motor and discharges the air inhaled through an inlet by the rotation of the impeller to a first nozzle and/or a second nozzle. The face washing pad rotates a first rotator by lifting the first rotator when air is inhaled through a first inlet and discharges the air outside through a second bubble generator when air is inhale through a second inlet.
Patent KR-20100121427-A (KR)
Title: Radiation-sensitive resin composition
Inventor: SHIMOKAWA TSUTOMU
IPC: G03F7/004
Filed: 2010-05-06
Abstract: PURPOSE: A radiation-sensitive resin composition is provided to enhance preservation stability and to use as a lithography material. CONSTITUTION: A radiation-sensitive resin composition contains: a resin; a radiation-sensitive acid generator containing a compound of chemical formula I, acid diffusion inhibitor, and propylene glycol monomer methyl ether acetate. In chemical formula I, M^+ is sulfonium cation or iodonium cation.
Patent KR-20110123037-A (KR)
Title: Semiconductor package
Inventor: JUNG TAE JEONG
IPC: H01L27/02
Filed: 2010-05-06
Abstract: PURPOSE: A semiconductor package is provided to reduce a power noise by arranging a passive device on the lower side of the semiconductor chip and attenuating the length of a power line between a semiconductor chip and the passive device. CONSTITUTION: A substrate(110) includes a cavity(111), a plurality of first bond fingers, and a plurality of a second bond fingers(113). A semiconductor chip(130) includes a plurality of bonding pads in an upper side. A passive device(150) is arranged in the lower side of the semiconductor chip to be placed in the cavity of the substrate. A connecting member(180) electrically connects the passive device and the substrate.
Patent KR-20110123375-A (KR)
Title: High efficient plasma reactor for thermal destruction processes of high concentrated perfluorocompounds gases
Inventor: LEE JOONG KEE
IPC: B01D53/46
Filed: 2010-05-07
Abstract: PURPOSE: A high efficient thermal plasma reactor for pyrolyzing highly concentrated perfluorocompounds gas is provided to overcome safety-related problems and the capacity limit of a exhaust gas disposing device. CONSTITUTION: A high efficient thermal plasma reactor includes a dual pipe reactor(10), a first external cooling pipe(16), a second external cooling pipe(20), a plasma torch connecting plate(26), and a discharging block(30). The dual pipe reactor includes a dual pipe structure with different diameters and heights. The first external cooling pipe is arranged at the outer diameter part of an external reacting pipe(14) in the dual pipe reactor and forms a closed gas flow path(15). The second external cooling pipe is arranged on the outer diameter part of the external reacting pipe and forms a coolant flowing path(19). The plasma torch connecting plate is attached to an upper flange(22). The upper flange is integrated with the upper sides of the first external cooling pipe and the second external cooling pipe. The discharging block is combined with a lower flange(24).
Patent KR-20110123484-A (KR)
Title: Organic solar cell and method of manufacturing the same
Inventor: YUN SUNG YOUNG
IPC: H01L31/042
Filed: 2010-05-07
Abstract: PURPOSE: An organic solar battery and a manufacturing method thereof are provided to secure an electron transfer passage and hole transfer passage over a whole photoactive layer, thereby reducing charge loss for the charge transferred to an electrode. CONSTITUTION: A lower electrode(10) and upper electrode(20) are arranged on a substrate(110). A lower auxiliary layer(15) is arranged on one surface of the lower electrode. An upper auxiliary layer(25) is arranged on one surface of the upper electrode. A photoactive layer(30) is arranged between the upper electrode and lower electrode. The photoactive layer comprises an inorganic nanostructure(30a) and a light absorbent(30b).
Patent KR-20110124419-A (KR)
Title: Providing chemiluminevscent spray
Inventor: LEE NAM KYUNG
IPC: C09K11/07
Filed: 2010-05-11
Abstract: PURPOSE: A light emitting spray is provided to separately store materials which generate chemical light emission in a spray container, thereby blocking the materials from external environments. CONSTITUTION: A first spray container(105) stores diphenyl oxalate and fluorescent dye or a mixing material. A second spray container(106) stores a material and hydrogen peroxide which form a snow shape. A first jetting pipe induces the materials. A second jetting pipe induces materials of the second spray container. A simultaneous jetting nozzle(111) simultaneously jets the materials of the first and second jetting pipes. A simultaneous jetting button(100) simultaneously jets the materials of the first and second spray containers to the simultaneous jetting nozzle.
Patent KR-20100129173-A (KR)
Title: Laundry machine
Inventor: KWON IG GEUN
IPC: D06F39/12
Filed: 2010-05-24
Abstract: PURPOSE: A laundry machine is provided to preventing vibration occurred in a drum from being transferred to a tub by controlling an interval between the tub and the drum in consideration of the movement of the drum. CONSTITUTION: A laundry machine comprises a tub, a drum, a driving unit, and a suspension assembly. The tub accepts washing water. The drum is rotatably installed inside the tub. The driving unit comprises a rotary shaft(351), a bearing housing(400), and a motor. The rotary shaft is connected to the drum. The bearing housing rotatably support the rotary shaft. The motor rotates the rotary shaft. The suspension assembly absorbs vibration occurred in the drum.
Patent KR-20110129710-A (KR)
Title: Road light for vehicle
Inventor: PARK SHIN NAM
IPC: H05B37/02
Filed: 2010-05-26
Abstract: PURPOSE: A lane lamp for road is provided to change a point light source into a linear light source by forming a penetration hole in inside and combining a light source in one side of the penetration hole, thereby reducing manufacturing costs. CONSTITUTION: A case(11) is composed so that a space which accepts an electronic component is formed. A solar cell module(12) is mounted in the inner side of the case. A condenser(13) is included in the inner side of the case. The condenser stores electricity in which a solar cell module produces. A light source(14) is combined in the inner side of the case and irradiates light. A control unit controls so that the light source is turned on at night time. A penetration hole is included in the side part of the case in order to be penetrated from outside. A fine protrusion is formed in the inner side of the penetration hole in order to easily scatter the light.
Patent KR-20100129208-A (KR)
Inventor: RYU HAN SEONG
IPC: C02F103/08
Filed: 2010-05-27
Abstract: PURPOSE: An electrode interval controlling apparatus for a plasma sterilizer, and a method thereof are provided to maximize the radiation efficiency of the plasma sterilizer by controlling the interval in real time. CONSTITUTION: An electrode interval controlling apparatus for a plasma sterilizer comprises a flux measurement unit, a controller for transmitting a controlling signal, a position control device for controlling a driver, and the driver. The flux measurement unit measures the flow amount of ballast water. The controller corresponds to the flow amount measured from the flux measurement unit. The position control device controls the driver by the controlling signal.
Patent KR-20100071026-A (KR)
Title: Wireless charge parking system
Inventor: BAIK WOON KI
IPC: H02J7/00
Filed: 2010-05-28
Abstract: PURPOSE: A wireless charge parking system is provided to perform an automatic parking, an auto charge, and an automatic calculation by charging a cellular phone using a radio energy transceiver. CONSTITUTION: A secondary coil(13) receives an inductive magnetic field. The secondary coil changes the inductive magnetic field into the induction electricity energy. A rectifier(14) changes the induction electricity energy into a DC current. A controller(11) generates a control signal according to a program. A sensor(22) senses incoming and outgoing of the vehicles(10). A primary coil(23) generates the inductive magnetic field. A controller checks the electricity remaining of the battery. The controller requests charge from the communications unit(24) of a parking lot. The controller(21) of the parking lot creates the inductive magnetic field.
Patent KR-20100065139-A (KR)
Title: Strip used for blood glucose measurement device
Inventor: CHOI KEE JUNG
IPC: A61B5/145
Filed: 2010-06-01
Abstract: PURPOSE: A strip is provided to minimize volume by constituting a blood sugar measuring device and a blood sample collecting device as an integrated compound. CONSTITUTION: A strip(400), which is inserted into a strip connector, is composed of an electrode unit(401), a strip hole(402), a reagent unit, and a PP(Poly Propylene) film(403). The electrode unit is inserted into the strip connector and delivers the information on the blood to the controller of the blood sugar measuring device. The laser generated from the laser modules is irradiated to a finger through the strip hole. The reagent unit measures any one or more among glucose, anti-insulin, and HbAIc. Either or both of ketone and cholesterol are measured using the strip. The PP film prevents the contamination of the blood sugar measuring device on the upper end of the strip.
Patent KR-20110133797-A (KR)
Title: 장스팬용 조립 철골 보 및 그를 이용한 철골 골조
Inventor: KIM HYUNG MAN
IPC: E04C3/04
Filed: 2010-06-07
Abstract: 본 발명은 아파트형 공장, 물류센터, 자주식 주차장 등 평면이 정형화되고 부재가 모듈화된 철골조 건축물에 바람직하게 적용될 수 있는 장스팬용 보에 관한 것으로, 보다 상세하게는 최소화된 춤으로 장스팬이 가능하여 층고 및 철골 물량의 절감이 가능하고 각종 설비 배관을 춤 내에서 배치 가능한 조립 철골 보 및 그를 이용한 철골 골조에 관한 것이다.  
본 발명의 적절한 실시 형태에 따른 장스팬용 조립 철골 보는, 양쪽의 단부 부재; 단부 부재의 춤보다 더 작은 춤을 갖고 양쪽의 단부 부재 사이에 결합된 중앙부 부재; 및 양쪽의 단부 부재와 상면의 높이가 서로 같도록 중앙부 부재의 상부에 서로 간격을 두고 결합된 복수 개의 스터브를 포함하는 것을 특징으로 한다.