baber/WOPTO huggingface dataset:
Patent KR-20020051817-A (KR)
Inventor: KANEDA SHOICHI
IPC: H04B1/38
Filed: 2001-10-15
Abstract: PURPOSE: A multifunctional sounding body for generating sound and vibration is provided to prevent a mechanical vibration system from largely displacing in a radial direction by receiving a shock when fallen and to prevent a suspension and a coil from being deformed and damaged. CONSTITUTION: The multifunctional sounding body(3) comprises a magnetic circuit(2) having a voice coil(8) and a spacer. A brim part(6) is arranged on the outer side of the magnetic circuit(2) which is elastically supported by a suspension(9). A plurality of projecting parts(5) are disposed on the inner peripheral face of the spacer arranged in the inner peripheral face of a casing and the brim part(6) is positioned in the projecting part(5) so as to be stored. Thus, the displacement of the mechanical vibration system is prevented by making the brim part(6) on the projecting part(5) at the time of displacement in the radial direction. Then, the suspension(9) and the coil(8) are prevented from being deformed and damaged.
Patent KR-20030033878-A (KR)
Inventor: NOH SEUNG JUN
IPC: F16F13/04
Filed: 2001-10-25
Abstract: PURPOSE: A shock absorber for a vehicle is provided to secure driving safety in cornering by increasing height of the shock absorber of an outer wheel with a height adjusting apparatus. CONSTITUTION: A shock absorber for a vehicle includes a pressure generating layer(C) and a height adjusting apparatus. The pressure generating layer is formed in a cylinder(11) airtightly apart from an oil layer(A) and a gas layer(B). The height adjusting apparatus increases pressure of the pressure generating layer forcibly. Therein, a piston rod(13) is extended. The height adjusting apparatus comprises a steering angle sensor(21); a height sensor(22); an ECU(Electronic Control Unit,23) and a nitrogen gas compressing device(30). The height sensor is installed to right and left sides of a vehicle. The ECU decides the vehicle is turning by analyzing signals of the steering angle sensor and the height sensor. The nitrogen gas compressing device is driven by a control signal of the ECU. Therein, the nitrogen gas layer of the cylinder is compressed toward an upper direction of the cylinder. Therefore, height of the vehicle is adjusted by extension of the shock absorber.
Patent KR-20010104771-A (KR)
Title: 강관 말뚝 인양용 기구
Inventor: LEE JUNG
Filed: 2001-10-27
Abstract: 네잎클로바형 패드본체(1)의 +자형 네군데에 밧줄(3)연결공(4)이 천설된 패드아이(2a)(2b)(2c)(2d)를 설치한 것을 인양하고져하는 강관말뚝(5)의 상하에 대칭되게 부착하여 패드아이의 연결공(4)에 밧줄(슬링와이어)(3)을 연결 결착하여 인양후 그 밧줄만 풀어주면 작업이 완료되므로 인양 작업이 간편 용이하고 강판을 훼손시키지 않는 특징이 있는 것이다.
Patent KR-20030041377-A (KR)
Title: Card game system and method through internet
Inventor: KIM BEOM HUN
Filed: 2001-11-20
Abstract: PURPOSE: A card game system through the Internet and a method thereof are provided to supply a fair Internet card game compared with a blackjack game by off-line by improving a reliability of a card game through the conventional Internet. CONSTITUTION: A user selects a game table to be participated and a game seat by clicking a number on the game table or a dealer participation button, connects to each game engine, and participates in the game table(f10). A dealer clicks a start button and informs a game start in a game engine(f11). The game engine informs the game start to a client program of each user and transmits a guidance message for betting to a user(f12). Each user bets during a predetermined time(f13). If the betting is completed, the game engine issues each user card and transmits card information to each user(f15). A game is progressed within a predetermined time(f16). If a user does not progress a game within a predetermined time, the game engine progresses a game instead of the user(f17,f18). If a dealer wins the game, betting money of a user is withdrawn from a reserve fund of data storage. A partial portion of the withdrawn reserve fund is accumulated for the dealer, another partial portion is subtracted as a commission, and the remaining amount is accumulated as a jackpot prize money(f24). If the game is over, the next game is started(f25).
Patent KR-20010110388-A (KR)
Title: 이동포장수단에 의한 사료 공급방법
Inventor: CHO SUNG YONG
Filed: 2001-11-20
Abstract: 본 발명은 이동포장수단에 의해 항만하역 또는 거점소비지 단위로 사료를 소포장하여 최종 소비자에게 직접 공급하는 사료공급방법을 제시하기 위한 것이다. 
     이를 위해 본 발명은 수입된 사료를 항만에서 하역하여 소비지와 가까운 거점소비지로 이동시키는 단계와, 계량장치 및 소포장장치가 포함된 이동포장수단을 거점소비지로 이동시켜 사료를 소포장하는 단계와, 소포장된 사료를 최종소비지로 운반하여 공급하는 단계에 의해 수입사료를 소비지와 가까운 거점소비지에서 포장하여 공급하는 것을 특징으로 하는 이동포장수단에 의한 사료 공급방법을 제시한다. 
     본 발명은 이동포장수단을 사용하여 최종소비지와 가까운 장소에서 소포장작업을 행하여 최종소비자에게 공급함으로서 물류비용을 현저히 절감할 수 있고, 물류에 드는 시간을 절약하여 보다 저렴한 비용으로 신선한 사료를 최종소비자에게 공급할 수 있는 효과를 갖는다.
Patent KR-20030042185-A (KR)
Title: Detonating process for Fuel Air Explosive munition
Inventor: JIN YEON TAE
IPC: F42B12/46
Filed: 2001-11-22
Abstract: PURPOSE: A triggering method of a FAE(Fuel Air Explosive) munition is provided to simplify the structure and to increase the operating reliability without a secondary triggering device. CONSTITUTION: A cartridge belt(1) is formed by an aluminum and one end of the cartridge belt is sealed by a cap(2). An explosive tube(3) is embedded in the center of the cartridge belt and a charging gunpowder(4) is filled inside the explosive tube. A fuel(5) is filled between the cartridge belt and the explosive tube. An igniting agent triggers the fuel-air cloud to be formed after the dispersion by the explosion of the gunpowder. Thereby, the triggering method is simple and the operating reliability is improved.
Patent KR-20030045992-A (KR)
Inventor: YOON IN HO
IPC: G02B26/10
Filed: 2001-12-03
Abstract: PURPOSE: A scanner motor for printer is provided to enhance the accuracy of rotation by installing a polygonal rotating mirror on an upper face of a rotor in order to exclude the combination tolerance between the rotor and a rotor frame. CONSTITUTION: A printed circuit board(1) is used for mounting elements for control circuit. A sleeve(2) is used for mounting on one side of the printed circuit board. A bearing(3) is mounted at the inside of the sleeve in order to support a rotary shaft(4). A core(5) is installed on an outer circumference of the sleeve. Coils(5a) are wound around the core. A rotor(11) is fixed at an upper end of the rotary shaft in order to cover the core. A magnet(6) is installed at an inner circumference of the rotor in order to generate the electromagnetic force. A polygonal rotating mirror(9) is fixed on a loading portion of the rotor. A support portion(12) is used for fixing the polygonal rotating mirror.
Patent KR-20020064645-A (KR)
Inventor: CHUN BYUNG SOO
IPC: C07F9/10
Filed: 2001-12-05
Abstract: PURPOSE: Provided is a method for extracting functional substance, phospholipid, from egg yolk by supercritical fluid extraction process. Also, provided is a method for purifying lecithin from the phospholipid. CONSTITUTION: The method for extracting phospholipid containing lecithin is characterized by comprising the steps of: filling liquid or powdery egg yolk in an extractor; then passing supercritical fluid, preferably carbon dioxide and/or propane through the extractor, wherein auxiliary solvent selected from the group consisting of ethanol, iso-propanol, methanol and normal hexane is optionally passed through the extractor with the supercritical fluid; and the temperature of the extractor is 10-70 deg.C, its pressure is 1200-8000psi and extraction time is 30-240 min..
Patent KR-20020048298-A (KR)
Inventor: AKSIT MAHMUT FARUK
IPC: F01C19/00
Filed: 2001-12-14
Abstract: PURPOSE: A brush seal is provided to prevent the separation of oil mist outside a bearing cavity by combining with a rotatable shaft. CONSTITUTION: A rotatable shaft is mounted in an oil bearing and generates oil mist. One or more brush seals(24) are carried by the bearing housing(22) for substantially sealing the oil mist in the bearing cavity from migration outwardly. The bristles(30) have a diameter in the range of .5 to 1.0 mils, preferably about .56 mils. The bristles have a stiffness less than 1 psi/mil and preferably about .2 psi/mil. The brush seal may be mounted on a sheet metal mounting plate, enabling an inexpensive securement of brush seals to the housing. Thereby, the brush seal seals the bearing cavity to prevent the outflow of the oil mist with low costs.
Patent KR-20030050695-A (KR)
Title: Method for producing ferritic stainless steel sheets having excellent ridging property
Inventor: PARK JAE SEOK
IPC: C21D8/04
Filed: 2001-12-19
Abstract: PURPOSE: A method for manufacturing ferritic stainless steel sheet is provided to improve ridging property by accumulating internal strain energy as cold rolling a hot rolled strip in continuous cold rolling mill, thereby breaking coarse grains by sufficiently performing recrystallization during annealing and cold rolling the strip. CONSTITUTION: In a method for manufacturing ferritic stainless steel sheet having a composition comprising 0.10 wt.% or less of C, 1.0 wt.% or less of Si, 1.0 wt.% or less of Mn, 0.040 wt.% or less of P, 0.030 wt.% or less of S, 15.0 to 20.0 wt.% of Cr, 0.2 wt.% or less of Al, 0.05 wt.% or less of N and a balance of Fe and other inevitably contained impurities, the method comprises a step (S1) of hot rolling a ferritic stainless steel slab having the above composition; a step (S2) of cold rolling the hot rolled strip in continuous cold rolling mill without annealing; a step (S3) of performing box annealing by maintaining the cold rolled strip at a temperature of 800 to 900 deg.C for 1 to 10 hours, or performing continuous annealing by heating the cold rolled strip to a temperature of 850 to 1,000 deg.C, with maintaining the heated cold rolled strip at that temperature for 10 seconds to 5 minutes and rapidly cooling the strip; a step (S4) of cold rolling the cold rolled annealed strip again in a 20 stage cold rolling mill; and a step (S5) of continuous annealing the cold rolled strip at a temperature of 800 to 900 deg.C for 5 seconds to 3 minutes.
Patent KR-20020050740-A (KR)
Title: Plasma display panel and drive method for the same
Inventor: MIZOBATA EISHI
IPC: G09G3/294
Filed: 2001-12-21
Abstract: PURPOSE: Plasma display panel and drive method for the same are provided to reduce the number of scanning drivers or the total number of X electrode drivers and Y electrode drivers by employing progressive drive. CONSTITUTION: In the preliminary discharge period(2), positive preliminary discharge pulses are applied to the X electrodes, and negative preliminary discharge pulses are applied to the Y electrodes. The voltage of the positive preliminary discharge pulse(5) is set to 160V, and the voltage of the negative preliminary discharge pulse 6 is set to -160V. The pulse width is set to 4 through 10 microsecond. Next, the period enters the scanning period(3). The voltages applied to the X electrodes are dropped to 0V in order. On the other hand, rectangular waves shifting a half period between odd-number lines and even-number lines are applied to the Y electrodes. Preferably, the Y2k electrode must be at -180V at a timing ts (s is an odd number) before the potential of the Y2k-1 electrode drops to 0V, so that the phase of the waveform of the Y2k electrode may be made to slightly precede.
Patent KR-20030057209-A (KR)
Title: Test handler of continuous test for semiconductor device
Inventor: HONG JIN SEOK
IPC: G01R31/26
Filed: 2001-12-28
Abstract: PURPOSE: A test handler for successive test of a semiconductor device is provided, which enables a normal operation in an area without error, even though an error is occurred in a specific area of the test handler. CONSTITUTION: A loader part accommodates a test board(20) where a plurality of semiconductor devices(200) are installed. A preheat part(12) enables the semiconductor devices installed in the test board to maintain a pre-established temperature, and comprises a buffer rail for buffering the plurality of test boards. A test site part(14) measures electrical characteristics in a package state of the semiconductor device maintaining the above temperature in the preheat part. A defroster part(16) recovers the temperature of the semiconductor device tested in the test site part into an atmospheric temperature. And an unloader part(18) accommodates the semiconductor devices onto another test board by classifying the semiconductor devices on the basis of the test result from the test board.
Patent KR-20010071881-A (KR)
Title: 웨이블렛 계수의 지향성 예측 코딩을 이용한 이미지 압축
IPC: H04N7/26
Filed: 1999-05-25
Abstract: 이미지 데이터의 변환된 셋트의 가장 가능성 있는 상관관계의 방향을 결정하는 단계와 변환된 데이터를 에러 인코딩(300) 단계를 포함하는 방법이 개시되어 있으며, 여기서, 상기 에러는 변환된 데이터 값과 상기 결정된 방향으로의 예측된 이웃 데이터 값 사이에서 결정된다. 이미지를 압축하기 위해 DWT 또는 이산 웨이블렛 변환을 이용하는 이미징 장치에서, 압축된 데이터의 에지의 방향은 통상적으로 제공되는 것보다 더욱 크게 상호 관련된 에러 이미지를 생성하기 위해 이용된다.
Patent KR-20010084883-A (KR)
Inventor: AOKI HIROBUMI
IPC: C12N15/55
Filed: 2000-10-25
Abstract: The present invention relates to a novel Rhodococcus bacterium and to a process of hydrolyzing a cyano group of a nitrile compound using a novel Rhodococcus bacterium to produce the corresponding carboxylic acid. The present invention also relates to a process of producing carboxylic acids, in particular cyano carboxylic acids using a transformant transformed with a plasmid containing a nitrilase gene, a nitrile hydratase gene and an amidase gene derived from Rhodococcus bacteria capable of exhibiting particularly excellent position selectivity for the cyano group of aromatic polynitrile compounds, to such a transformant, such a plasmid, to such genes, to a process of producing an enzyme using the transformant, and to enzymes obtained by the process. The carboxylic acids, in particular cyano carboxylic acids obtained by the present invention are useful as starting materials for the synthesis of drugs, agrochemicals, dyestuffand other chemicals.
Patent KR-20010101950-A (KR)
Title: 치환된 방향족 아미딘 유도체 및 이를 함유하는 의약조성물
Inventor: KOO BON AM
IPC: A61K38/00
Filed: 2000-03-15
Abstract: 본 발명은 강력한 선탁적 트롬빈 억제활성을 가지며 또한 경구적으로 투여할수 있는 신규의 방향족 아미딘 유도체 및 이를 활성성분으로 함유하는 트롬빈 억제용 조성물에 관한 것이다.
Patent KR-20020043456-A (KR)
Title: 소모된 원자핵 폐기물의 핵 분열로부터의 전력
IPC: G21G1/12
Filed: 2000-05-19
Abstract: 단색성 형태의 선형 가속기는 약 10MeV의 에너지를 얻기 위하여 전자를 가속하고, 이는 (γ,f) 반응에 의해서 U 238 과 같은 연료 물질로 유도되는 감마 선을 생성하기 위하여 텅스텐과 같은 높은 Z 타겟을 유입한다. 이에 따라서, 약 200MeV를 생성한다. 1MW에 의해서 구동되는 가속기를 필요로 하는 본 발명에 따라서 구축된 원자로는 약 20MW의 전력을 얻을 수 있을 것이다. 반응은 자활이 아니며, 빔이 턴 오프될 때 정지된다. 원자로에서 구동되는 이러한 가속기는 단지 10MeV에서 동작되어 지면, "소비되는 연료"를 분열 원자로로부터 사용될 수 있다. 광 분열은 Cs 137 및 Sr 90 과 같은 전형적인 소비되는 연료 폐기물을 유발하며, 이는 단 주기 또는 안정 상태의 물질을 유발하는 (γ,n) 반응에 의해서 광 분열이 수행된다.
Patent KR-20020092779-A (KR)
Title: 혈관형성 단백질 및 이의 용도
IPC: A61P35/00
Filed: 2000-06-01
Abstract: 본원에는 사람 혈관형성 폴리펩티드, 이의 생물학적 활성, 진단학적 또는 치료학적으로 유용한 단편, 유사체 또는 유도체, 및 이러한 혈관형성 폴리펩티드를 암호화하는 DNA(RNA)가 기재되어 있다.  또한, 재조합 기술에 의해 당해 폴리펩티드를 제조하는 방법, 및 상기 폴리펩티드에 대한 항체, 효능제 및 길항제가 제공된다.  당해 폴리펩티드 및 폴리뉴클레오티드는 상처 치유를 자극하고 혈관 조직 수복을 위해 치료학적으로 사용될 수 있다.  또한, 종양 혈관형성을 억제하므로, 종양 성장, 염증, 당뇨병성 망막증, 류마티스성 관절염 및 건선을 억제시키기 위해 당해 항체 및 길항제를 사용하는 방법이 제공된다.  추가로, 혈관형성 및 림프관형성을 증진시키기 위해 당해 항체 및 효능제를 사용하는 방법이 제공된다.  당해 길항제는 혈관 투과성 증가로 인해 유발된 만성 염증을 치료하는 데 사용할 수도 있다.  이들 장애 이외에도, 당해 길항제는 당뇨병과 연관된 망막증, 류마티스성 관절염 및 건선을 치료하는 데 이용할 수도 있다.  당해 효능제 및/또는 길항제는, 예를 들어, 본원에 기재되어 있는 바와 같은 약제학적으로 허용되는 담체와 함께 조성물에 이용될 수 있다.
Patent KR-20020027382-A (KR)
Title: 콘텐트 정보의 의미론에 따른 음성 명령
IPC: G10L15/26
Filed: 2001-04-26
Abstract: 비디오나 오디오 콘텐트 정보의 재생에 관한 음성 제어나 다른 처리는 상기 콘텐트 정보에 의미적으로 관련된 음성 명령을 사용한다.
Patent KR-20030061034-A (KR)
Inventor: JUNG JI U
IPC: H04B7/26
Filed: 2002-01-07
Abstract: PURPOSE: A method for setting dummy bearers in a DECT(Digital European Cordless Telecommunication) system is provided to analyze RSSI measured results of each base station in a central control device, and to determine position of each dummy bearer, thereby minimizing overlapping or interference of wireless channels generated while setting the dummy bearers. CONSTITUTION: A central control device transmits an RSSI check request message to many base stations(S1). Each base station instantly creates and removes dummy bearers, respectively, in response to the message, and stores RSSI values of dummy bearers of other base stations(S2). Each base station transmits an RSSI check response message to the central control device(S3). The central control device analyzes the RSSI values included in the RSSI check response message, and analyzes which base stations are adjacent to other base stations(S4). The central control device selects optimal dummy bearer slots and frequencies, and transmits a dummy bearer request message to each base station(S5). Each base station creates each dummy bearer with the dummy bearer slots and the frequencies(S6).
Patent KR-20020023267-A (KR)
Inventor: LEE JEONG MIN
IPC: B65D21/00
Filed: 2002-01-05
Abstract: PURPOSE: A cup shaped container with a debouchment designed to be piled on in empty state is provided to prevent the phenomenon of vacuum generated between the empty containers when they are piled on, thus to help a user to easily separate the containers. CONSTITUTION: The cup shaped container(1) designed to be piled comprises a body formed to be gradually widen from a bottom surface part to a top opening part, and a debouchment having a discharge hole is supported on the bottom surface part by using a foldable portion(7). The foldable portion is constructed to be folded when a user pushes a cap member(10) of the container toward the foldable portion, thus the foldable portion is able to automatically create a jaw portion as a spacer inside the bottom surface part. In this way, these containers are able to be stacked so that they are spaced from each other at regular distances.
Patent KR-20030062636-A (KR)
Title: Holder for fixing the position of terminal pin of vcr tuner
Inventor: LIM NAM GYUN
IPC: H04B1/08
Filed: 2002-01-18
Abstract: PURPOSE: A holder of terminal pins of a tuner chassis is provided to prevent the deformation in the arrangement of terminal pins while conveying and handling VCR tuners, thereby reducing the defects of the tuners. CONSTITUTION: A holder of terminal pins of a tuner chassis includes a plurality of protrusions(3) positioned on a contact portion between a tuner chassis and top surfaces of a plurality of terminal pins and protruded forward and backward the contact area of the chassis by a length shorter than the length of the terminal pins. The protrusions are inserted between the terminal pins downward for preventing the traverse deformation of the terminal pins.
Patent KR-20030062903-A (KR)
Title: Device for regulating a high voltage of a display
Inventor: KIM JU MAN
IPC: H04N3/19
Filed: 2002-01-21
Abstract: PURPOSE: A device for preventing high voltage boosting of an image display device is provided to construct a high voltage sensing circuit part with simple circuit components to reduce the manufacturing cost and realize the precise operation performance of the high voltage sensing circuit part. CONSTITUTION: A device for preventing high voltage boosting of an image display device includes a high voltage sensing circuit part(200) having an input terminal connected to a third output terminal of a flyback transformer(100) and an output terminal connected to an input terminal of a microcomputer(120), and the microcomputer for comparing a voltage input from the high voltage sensing circuit part with a reference voltage preset in the microcomputer to control the operation of a deflection/high voltage circuit part(130) according to the comparison result.
Patent KR-20030071101-A (KR)
Title: Method of Manufacturing Large Scale Relief Using Reverse Engineering Techniques
Inventor: HAN CHANG SEOK
IPC: G06F17/50
Filed: 2002-02-27
Abstract: PURPOSE: A large-sized relievo producing method is provided to copy a shape of a small-sized relievo object, and then, to produce a large sized relievo object according to the copied shape. CONSTITUTION: The method comprises several steps. A referential relievo is previously surveyed(S11). The surface of the referential relievo is scanned by a three dimensional scanner to collect plural point data with three dimensional coordinate values(S12). Triangular lattice models are made by connecting three points among the plural point data, and then, three dimensional model data is made for being usable in a CAD/CAM system(S13). A three dimensional model data for a large-sized relievo is made by enlarging the three dimensional model data of the referential relievo(S14). The three dimensional model of the large-sized relievo is split into proper-sized pieces by using a three dimensional CAD system(S15). Each real-sized piece is produced by using a CAM system(S16). A wanted large-sized relievo is produced by attaching the real-sized pieces on walls, a floor, or a ceiling of a building(S17).
Patent KR-20020070850-A (KR)
Inventor: FUJII TOSHIYA
IPC: H04N5/217
Filed: 2002-02-28
Abstract: PURPOSE: A solid-state image pickup apparatus and a method for driving the pickup apparatus are provided to improve resolution, and to read image at high speed by correcting output characteristics of a CCD(Charge Coupled Device). CONSTITUTION: A solid-state image pickup device permitting parallel readout is composed of an image pickup section(103) partitioned into strip blocks; a readout amplifier(130) for each block; an input source(101); and a marker signal generation section(102) for generating marker signals for correction of outputs of the readout amplifiers. The marker signal generation section includes a marker charge storage portion made of capacitors for respectively storing the amount of charge corresponding to the potential at the input source. The marker signals with a same charge amount generated in the marker signal generation section are read through vertical CCDs(114,115) of two adjacent blocks, horizontal CCDs(110,111) and readout amplifiers sequentially.
Patent KR-20030072040-A (KR)
Inventor: MUN GYU SEON
IPC: G02B5/02
Filed: 2002-03-05
Abstract: PURPOSE: A projection display screen is provided to prevent a defect of an image by refracting and scattering the image projected from a projector or a slider through beads of a dispersing plate. CONSTITUTION: A projection display includes a screen(1) for displaying an image, and a projector for projecting the image to the screen(1). The image projected from the projector is focused on the screen(1) while being refracted and scattered through beads irregularly aligned on a base film(13). The base film(13) forms a dispersing layer(15). A substrate(11) is installed front and/or rear portions of the dispersing plate so as to cover the dispersing layer(15). It is also possible to directly coat the dispersing layer(15) to the surface of the substrate(11) while removing the base film(13).72076
Patent KR-20030073217-A (KR)
Inventor: JANG GEUN SEON
IPC: F28F1/32
Filed: 2002-03-09
Abstract: PURPOSE: A heat exchanger is provided to reduce pressure loss by preventing growth of a flow boundary layer by reducing air flowing resistance. CONSTITUTION: Slits(41,42,43,44,45,46,47,48) on a first row and a second row, a third row and a fourth row formed on sides of a base surface of a heat transfer fin(10) through which air flows in and out are divided into two unit slits, respectively, and formed symmetrically to each other with respect to a center line connecting centers of joining holes(30). The unit slits on the first row and the fourth row are formed to be inclined to the neighboring joining holes, respectively. The unit slits on the second row and the third row are formed to be inclined at angles smaller than inclining angles of the unit slits on the first row and the fourth row. The unit slits are formed as asymmetric trapezoids. The unit slits on the first row and the fourth row are formed to be inclined to the neighboring joining holes by 10 deg., respectively. The unit slits on the second row and the third row are formed to be inclined to the neighboring joining holes by 6 deg., respectively.