baber/WOPTO huggingface dataset:
Patent KR-20020061495-A (KR)
Inventor: CHEN JAU-YUEN
IPC: H04N5/21
Filed: 2001-12-29
Abstract: PURPOSE: A method for eliminating image artifacts of a liquid crystal projector is provided to smoothen the screen area and remove moire from the screen area selectively by maintaining definition with identifying screen or non-screen regions. CONSTITUTION: A method for eliminating image artifacts of a liquid crystal projector identifies screen and non-screen regions of a projected or displayed image to smooth and selectively remove moire from the screen regions while maintaining definition in the non-screen regions. Each pixel in the image is classified as a screen or non-screen pixel and then pixels in a predetermined surrounding area of each pixel are examined to check the classification of the pixel. A low pass filter(43) is applied to pixels in the image. When the low pass filter is applied, a center of the low pass filter is selectively shifted relative to a current pixel based on the examination.
Patent KR-20010053585-A (KR)
Title: 강유전성 기억 장치
IPC: H01L21/8246
Filed: 1999-07-05
Abstract: 본 발명은 다수의 메모리 셀로 이루어진 메모리 셀 어레이를 포함하는 강유전성 기억 장치에 관한 것이다.  각각의 메모리 셀은 적어도 하나의 실렉터 트랜지스터(TG1, TG2)와 기억 커패시터(CF1, CF2)를 포함하며 워드선(WL)과 비트선(BL, bBL)에 의해 제어된다.  단락 트랜지스터(SG1, SG2)는 각각의 기억 커패시터(CF1, CF2) 위에 위치하여 장애 펄스로부터 상기 기억 커패시터(CF1, CF2)를 보호한다.
Patent KR-20010072452-A (KR)
Title: 내파괴성 폴리올레핀 막
IPC: H01M50/491
Filed: 1999-07-01
Abstract: 간단하게, 한 측면에서, 본 발명은 용융-가공가능한 반-결정질 열가소성 중합체로 제조된 내파괴성 미소다공성 재료를 제공한다.  미소다공성 재료는 비교적 높은 비율로 낮은 비용으로 제조할 수 있다.  미소다공성 재료로 제조된 필름과 다층 구조물, 및 미소다공성 재료의 제조 방법을 또한 제공한다.
Patent KR-20010085918-A (KR)
Title: Polymer Coated Carbon Products and Other Pigments and Methods of Making Same by Aqueous Media Polymerizations or Solvent Coating Methods
IPC: C08F2/44
Filed: 1999-10-08
Abstract: A polymer coated modified carbon product is described wherein the polymer at least partially coats a modified carbon product. The modified product preferably has at least one organic group attached to the carbon product and the organic group is preferably substituted with an ionic, ionizable, or polar group for preparation in polar or aqueous based media. Methods of making the polymer coated modified carbon product are also described, such as by aqueous-based or solvent free polymerization methods, organic solvent based polymerization methods, or solution coating methods. Polymeric products and masterbatches containing the polymer coated modified carbon products are also described as well as methods to improve properties such as impact properties and tensile properties. Polymer coated modified colored pigments, methods of making the same, and polymeric products and masterbatches containing polymer coated modified colored pigments are also described.
Patent KR-20010075625-A (KR)
IPC: H01L21/677
Filed: 1999-09-21
Abstract: 본 발명은 웨이퍼 분류/저장 장치에 관한 것이다.  분류 장치에는 웨이퍼를 포함하는 2개 이상의 카세트가 설치될 수 있고, 웨이퍼는 하나의 카세트에서 다른 카세트로 또는 그 역으로 이동하게 된다.  필요에 따라, 측정 스테이션도 상기 분류 장치에 설치될 수 있다.  분류 장치의 매우 인접하게, 상기 카세트들이 매거진내에 저장되며, 이 매거진은 이를 위해 설계되어 있고 카세트 취급 장치를 사용하여 카세트를 이동시킨다.
Patent KR-20010080388-A (KR)
Title: Compounds with growth hormone releasing properties
IPC: A61P25/24
Filed: 1999-11-03
Abstract: This invention relates to novel compounds, compositions containing them, and their use for treating medical disorders resulting from a deficiency in growth hormone.
Patent KR-20020001720-A (KR)
IPC: H05B33/22
Filed: 2000-01-03
Abstract: 본 발명은 투명 전도층(1), 투명 전도층(1)의 후면상에 위치되는 바인더층(2, 4), 바인더층(2)을 통하여 투명 전도층(1)의 후면상에 적용되는, 발광 입자들을 포함하는 입자들로 이루어진 실질적으로 하나의 층을 포함하는 발광 입자층(3), 발광 입자층(3)의 후면상에 위치되는 절연 입자들을 포함하는 절연층(5) 및 절연층(5)의 후면상에 위치되는 후면 전극(6)을 포함하는 전기루미네선트 장치(10)을 제공하고, 발광 입자들(3)은 바인더층(2, 4)에 내장되거나, 발광 입자들은 절연층(5)에 실질적으로 내장되지 않는다.
Patent KR-20010092786-A (KR)
Title: 집적회로 제조시 고순도 구리의 도체 구조를 전해적으로형성시키는 방법
IPC: H01L21/768
Filed: 2000-01-11
Abstract: 본 발명은 집적회로 제조시, 홈 (2)이 있는 반도체 기판(웨이퍼)(1)의 표면 상에 고순도 구리의 도체 구조를 전해적으로 형성시키는 방법에 관한 것이다.     본 발명의 방법은 하기의 단계들을 포함한다: a) 홈 (2)이 있는 반도체 기판 (1)의 전체 표면을 기본 금속 층으로 코팅하여, 전해 증착을 위한 충분한 전도도를 수득하고; b) 반도체 기판을 구리 증착조와 접촉하게 하여 전해 금속 증착법에 의해 기본 금속층의 전체 표면에 균일한 층 두께로 구리층을 전면 증착한다.     상기 구리 증착조는 하나 이상의 구리 이온 공급원, 구리층의 물리-기계적 특성을 조절하기 위한 하나 이상의 첨가 화합물 및 Fe(Ⅱ) 및/또는 Fe(Ⅲ) 화합물을 함유한다.     반도체 기판과, 전해조에서 불용성이고 함께 접촉되어 있는 치수적으로 안정한 상대전극 사이에 전압을 적용시켜, 반도체 기판 (1)과 상대전극 사이에 전류가 흐르게 한다.     본 발명의 마지막 단계는 c) 구리층 (3)을 구조화하는 것이다.
Patent KR-20010108249-A (KR)
IPC: G01N33/50
Filed: 2000-02-23
Abstract: 난모세포로부터 난모세포 부피의 약 5%인 세포질 부분을 유리하는 단계를 포함하는, 난모세포의 수정능력을 손상시키지 않고 난모세포로부터 세포질 부분을 분리하는 방법. 세포로부터 세포부피의 약 5%인 세포질 부분을 유리하는 단계를 포함하는, 세포의 발생 잠재성을 손상시키지 않고 배세포로부터 세포질 부분을 분리하는 방법.
Patent KR-20020018999-A (KR)
Title: 히드로퍼옥시드 분해 방법
IPC: B01J23/52
Filed: 1999-03-10
Abstract: 알킬 또는 방향족 히드로퍼옥시드를 분해하여 상응하는 알콜 및 케톤을 함유하는 분해 반응 혼합물을 형성하는 개선된 방법.  이 개선 방법은 히드로퍼옥시드를, 금으로 구성되고, 금과 함께 원소 주기율표의 8 족으로부터 선택된 1 종 이상의 추가의 금속이 존재하는 촉매량의 불균일 촉매와 접촉시킴으로써 히드로퍼옥시드를 분해하는 것과 관련된다.  또한, 촉매는 임의로는 SiO 2 , Al 2 O 3 , 탄소, 지르코니아, MgO 또는 TiO 2 와 같은 적합한 지지 부재상에 지지된다.  본 방법은 또한 임의로는 수소 기체의 존재하에 수행된다.
Patent KR-20010109334-A (KR)
IPC: H04N19/433
Filed: 2001-01-15
Abstract: 종래의 MPEG 비디오 인코더는 이전 이미지를 참조하여 전진 모션 벡터들을 검색하고 다음 이미지를 참조하여 후진 모션 벡터들을 검색하여 B-화상들 인코딩에  대해 모션 보상된 예측 이미지를 제공한다. 이것은 상기 이미지들이 저장된 메모리에 2N 엑세스를 요구한다. P-화상들에 대한 모션 벡터들의 검색은 N 메모리 엑세스를 요구한다. 본 발명은 P-코딩 모드에서 두 통로 모션 벡터 검색을 실행하여 여분의 능력을 사용한다. 제 2 통로에서, 제 1 통로에서 발견된 모션 벡터들의 정확성이 더 개량된다. 이것은 P-화상들에 대해 더욱 정밀한 모션 벡터들을 제공한다.
Patent KR-20020010618-A (KR)
Title: 인테그린 수용체 길항제
IPC: C07D307/68
Filed: 2000-04-17
Abstract: 본 발명은 인테그린 수용체에 결합하는 신규 화합물, 이들의 제조, 인테그린 수용체 길항제로서의 용도 및 질병 치료를 위한 이들의 용도, 이들 화합물을 포함하는 약제학적 제제 및 1종 이상의 기타 활성 화합물을 포함하는 약제학적 제제에 관한 것이다.
Patent KR-20020003878-A (KR)
IPC: C08L63/00
Filed: 2000-04-03
Abstract: 본 발명은 거의 질소가 없고 사슬 연장이 없는 하나 이상의 에폭시 수지 및 하나 이상의 페놀 수지와 알릴 작용성 물질 및 말레산 무수물의 공중합체의 혼합물인 하나 이상의 경화제를 포함하는 수지 시스템에 관한 것이다.
Patent KR-20020001887-A (KR)
Title: Marine propeller with detachable blades
IPC: B63H3/12
Filed: 2000-05-12
Abstract: A marine propeller comprises a hollow hub body (11), a plurality of propeller blades (16) and a plurality of fastening devices (19, 21) for each propeller blade (16). Each fastening device includes a tension rod (19) and a flange member (22) mounted on the tension rod. The propeller blades (16) may be turnable for adjustment of the blade pitch angle (alpha) and lockable in a selected position by means of the fastening devices (19, 21). The flange member (22) has a plurality of recesses (23) and tensioning members (24) received in the recesses. These tensioning members (24) are extendable from the flange member (22) towards the hub body wall (14) to apply tension to the tension rod (19).
Patent KR-20020027350-A (KR)
IPC: A61P15/06
Filed: 2000-05-30
Abstract: 본 발명은 하기 화학식 (I) 및 (II)의 신규한 디티에피노[6,5-b]피리딘을 제공하는 것이다. 상기 화합물들은 심혈관, 항천식 및 항기관지 수축 활성을 갖는 칼슘 채널 길항제로서 유용하다. 이와 같이, 본 발명은 또한 과민증, 알레르기, 천식, 기관지경련, 월경불순, 식도 경련, 녹내장, 조발성 분만, 요도 질환, 위장 운동 질환 및 심혈관 질환과 같은 질환의 예방 및 치료를 위한 약제학적 조성물뿐만 아니라 방법도 제공한다. 
       화학식 (I) 
       화학식 (II)
Patent KR-20030059680-A (KR)
Inventor: LEE JEONG U
IPC: H04L12/66
Filed: 2002-01-04
Abstract: PURPOSE: A method for managing a directory using a SIP(Session Initiation Protocol) is provided to input a directory using an equipment easy to input characters, such as a user computer, and to enable many SIP phones to share the inputted directory. CONSTITUTION: If a user accesses a web server through a terminal(S20), the web server judges whether the user has valid authority(S21). In case that the user is not valid, the web server displays a SIP unavailable message to the user(S22). If it is judged that the user is valid, the user inputs a directory(S23). The web server stores the inputted directory in the SIP directory server(S24).
Patent KR-20030060341-A (KR)
Title: Expression grammar upgrade apparatus and method for extensible markup languages of internet phone
Inventor: YOON IN HO
IPC: H04L12/66
Filed: 2002-01-08
Abstract: PURPOSE: A device for upgrading an XML(Extensible Markup Languages) expression grammar of an Internet phone is provided to store XML expression grammar files in a TFTP(Trivial File Transfer Protocol) server, and to download a file according to a type of the Internet phone among the XML expression grammar files, then to upgrade the downloaded file, thereby reducing upgrade time by easily upgrading the file regardless of a kind of the Internet phone. CONSTITUTION: A TFTP server(10) stores upgraded XML expression grammars, and transmits the XML expression grammars if a downloading of the stored XML expression grammars is requested. Many Internet phones(20) are connected to the TFTP server(10) over the Internet, are connected to the TFTP server(10) by user operation or in automatic method, and download the XML expression grammars to upgrade the XML expression grammars. An embedded system(30) uses XML.
Patent KR-20020060606-A (KR)
Title: A method for controlling an electronic fuel pump
Inventor: HATAYAMA ATSUSHI
IPC: F02D43/00
Filed: 2002-01-10
Abstract: PURPOSE: To control the starting operation of a fuel pump 26 using either of a first operation mode and a second operation mode by providing a control means 55 with the first operation mode to be set when a battery voltage VB possible to operate a starter motor 33 is detected and the second operation mode different from the first operation mode and to be set, when a battery voltage VB is incapable of operation for the starter motor 33 is detected. CONSTITUTION: Start time control for an electromagnetic fuel pump can be performed with an appropriate control content different between a case of starting an engine with a kick starting device and a case of starting the engine by a starter motor starting device. For example, engine starting ability by the kick starting device when the fuel inside of a carburetor is consumed can be improved, and the power to be supplied to the fuel pump can be restricted, when starting the engine by the starter motor starting device.
Patent KR-20030035735-A (KR)
Title: Fabricating method of Ag-AgCl electrode
Inventor: JUN SANG BEOM
IPC: H01M4/54
Filed: 2002-01-18
Abstract: PURPOSE: Provided is a method for producing a silver-silver chloride electrode having fine structure by reacting a plasma state of chlorine gas with silver, which can simply mass-producing the electrode. CONSTITUTION: The method comprises the steps of (i) vapor-depositing silver with predetermined thickness on an insulating substrate(101), to form a thin film layer of silver(102), and (ii) reacting the thin film layer with chlorine plasma to form silver chloride layer(103). The thickness of the thin film layer of silver(102) is 4000-6000 angstrom. The chlorine plasma is formed at the condition of RF(Radio Frequency) of 80-120 mW, the flow rate of chlorine gas of 50-150 sccm, and the chamber pressure of 80-120 mTorr.
Patent KR-20030062995-A (KR)
Title: A spinfinish oil composite for elastic synthetic fiber with excellent heat-stability
Inventor: LEE CHANG BAE
IPC: D06M13/248
Filed: 2002-01-22
Abstract: PURPOSE: An emulsifier composition for thermoplastic synthetic fiber is characterized by having excellent smoothing property and heat stability, controlling the generation of fume and tar and improving working conditions. On spinning the fiber, the composition controls the generation of noils. Therefore, the fiber has excellent quality and excellent processability. CONSTITUTION: The emulsifier composition contains 10-30wt.% of thio diglycolic acid diester compound(formula I). In the formula I, R1 and R2 are C4-C18 alkyl group; x and y are an integer of 1 or 2; m and m' are an integer of 2<=m+m'<=10; and n and n' are integer of 2<=n+n'<=10. The emulsifier composition is comprised of a smoothing agent containing the thio diglycolic acid diester compound, an antistatic agent and an emulsifier.
Patent KR-20030063041-A (KR)
Title: Method for controlling call forward service
Inventor: YANG GI SEUNG
IPC: H04M3/54
Filed: 2002-01-22
Abstract: PURPOSE: A method for controlling incoming call forwarding is provided to forward a call correspondingly to a location of a user, and to enable selection of more than two forwarding numbers upon incoming call forwarding, thereby enhancing a success rate of a call forwarding service. CONSTITUTION: A caller MSC(10) receives a call generating message(200), and delivers a message requesting location information of an incoming MS(Mobile Station) to an HLR(Home Location Register)(20)(202). The HLR(20) delivers a routing request message to a VLR(Visitor Location Register)(40)(203). The VLR(40) forwards the routing request message to an incoming MSC(30)(204). The incoming MSC(30) delivers a response message for the routing request message to the VLR(40)(205). The VLR(40) delivers the response message to the HLR(20)(206). The HLR(20) delivers a response message for the message requesting location information of the incoming MS to the caller MSC(10)(208). The caller MSC(10) sets up a call with the incoming MSC(30)(210). The incoming MSC(30) delivers a paging signal to a BSC(Base Station Controller) including the corresponding MS(211). The incoming MSC(30) delivers a call forwarding request message to the caller MSC(10)(212). The caller MSC(10) delivers a message requesting a forwarding number to the HLR(20)(214). The HLR(20) delivers a response message for the message requesting a forwarding number to the caller MSC(10)(216). The caller MSC delivers the received response message to the incoming MSC(30)(218). The caller MSC(10) releases the call setup with the incoming MSC(30)(220). And the caller MSC(10) sets up a call to the corresponding call forwarding number(222).
Patent KR-20030064455-A (KR)
Title: Circuit for insulation of module for communication
Inventor: KIM YONG GYU
IPC: H04B1/18
Filed: 2002-01-28
Abstract: PURPOSE: An insulation circuit of a communication module is provided to install an RF(Radio Frequency) switch on a line, and to switch the RF switch upon transmission to certainly open a line connected to an RX unit from an antenna, thereby improving insulation characteristics relatively by maintaining insulation at about -60dB during transceiving operation. CONSTITUTION: An insulation circuit(100), or an RF switch, switched according to control of a controller of a communication module is installed on a line connected between an antenna and an RX unit(1). In the insulation circuit(100), a motional contact point(101) is connected to the antenna, the first fixed contact point(102) is connected to an input part of the RX unit(1), and the second fixed contact point(103) is connected to an output part of a TX unit(2). The motional contact point(101) of the insulation circuit(100) is connected to the second fixed contact point(103) upon signal transmission of the TX unit(2) according to a control signal of the communication module. The motional contact point(101) is connected to the first fixed contact point(102) upon signal receiving of the RX unit(1), to completely electrically insulate the TX unit(2) and the RX unit(1).
Patent KR-20030065971-A (KR)
Inventor: CHOI CHANG BONG
IPC: F25D25/00
Filed: 2002-02-02
Abstract: PURPOSE: A water tank for a dispenser of a refrigerator is provided to utilize the upper part of the water tank as a loading space and increase the inner volume efficiency of the refrigerator by improving the structure of a knob for the water tank. CONSTITUTION: A water tank(130) which stores water in a dispenser for supplying drinking water to the outside with closing a door(10) of a refrigerator comprises a body(131) having a valve(132) supplying water to the dispenser at a side and a housing space storing water therein, a first knob unit of which each end is vertically bent, combined, and fixed to both sides of the body, and a second knob unit of which each end is hinge-combined to the first knob unit and the second knob unit functioning as a holder for loading articles when the water tank is mounted in the refrigerator.
Patent KR-20030067835-A (KR)
Title: Driving device of a solenoid coil in vehicle
Inventor: KIM HWI SEOP
IPC: B60T17/22
Filed: 2002-02-08
Abstract: PURPOSE: A driving device of a solenoid coil is provided to improve the reliability of the system by insulating power applied to the solenoid coil with forcibly turning the fail-safe relay off and alarming to a driver in detecting failure of the fail-safe relay. CONSTITUTION: A solenoid coil driving device is composed of a microcomputer(21) controlling an anti-lock brake system; a driving unit(23) controlling a fail-safe relay(20) for regulating direct current applied to the solenoid coil by receiving a control signal from the microcomputer; a switching unit(22) regulating output power of the solenoid coil; and a voltage detecting unit(24) detecting voltage at both ends of the fail-safe relay. The microcomputer decides failure condition of the fail-safe relay based on voltage difference detected from the voltage detecting unit. The reliability is improved by forcibly turning off the fail-safe relay at failure and alarming to the driver.
Patent KR-20030068009-A (KR)
Title: Apparatus and method for atm adaptation layer 2 switching
Inventor: LEE U JUN
IPC: H04L12/56
Filed: 2002-02-09
Abstract: PURPOSE: A device for switching an AAL(ATM Adaptation Layer) 2 is provided to use a memory mapping technique, and to implement the device in hardware, thereby reducing delay time while switching the AAL 2. CONSTITUTION: A cell disassembler(620) inputs an ATM cell to disassemble a payload of the ATM cell to a CPS packet, and converts a header of the CPS packet and a header of the ATM cell into a certain type referring to a lookup table block. A header converter(630) inputs the CPS packet, and converts the CPS packet so that the header of the CPS packet indicates a next path, in reference to the lookup table block. A storage(660) stores the lookup table block. A cell assembler(640) inputs the CPS packet, converts the header of the CPS packet into a certain type requested by an ATM network, accumulates the CPS packet, and creates the ATM cell.
Patent KR-20030068620-A (KR)
Title: Method for inducing a information inquiry of a unregistered recipient based on the internet-network
Inventor: HONG JUNG KI
IPC: G06Q99/00
Filed: 2002-02-15
Abstract: PURPOSE: A method for inducing an unregistered receiver to search information based on the Internet network is provided to enable the unregistered receiver to freely log in to a system and easily confirm the information received to the unregistered receiver. CONSTITUTION: If an information transmission event for the unregistered receiver is occurred from an information transmission management agent, the information for the unregistered receiver is temporarily stored and the temporary certification data for the unregistered receiver is generated(S208). A login inducing mail attaching the temporary certification data is generated and transmitted to a mail account of the unregistered receiver(S209). If the unregistered receiver login event is occurred from the unregistered receiver, the identification of the unregistered receiver is temporarily confirmed by the temporary certification data(S212). If the identification of the unregistered receiver is confirmed, an information page for the unregistered receiver is generated and transmitted to the unregistered receiver(S214).
Patent KR-20030069448-A (KR)
Title: Development apparatus comprising a rotating depositing roller
Inventor: NOH GWANG HO
IPC: G03G15/10
Filed: 2002-02-20
Abstract: PURPOSE: A developing apparatus having a rotating fusing roller is provided to smoothly flow a developer between the fusing roller and a developing roller in the case that the developer has a high density. CONSTITUTION: A photoconductive body(51) forms an electrostatic latent image by a static device and an exposing device. A developing roller(63) supplies a developer(68) to the photoconductive body for developing the electrostatic latent image. A fusing roller(67) contacts with the developing roller for depositing the developer. A metering device(61) applies pressure or electric power to maintain the developer of a surface of the developing roller at an appropriate density. A first cleaning device(69) cleans ink particles attached to the surface of the fusing roller. A second cleaning device(65) cleans the developer remaining on the surface of the developing roller after the photoconductive body develops the electrostatic latent image.
Patent KR-20030071994-A (KR)
Title: System for coupling shaft of pump for the sea
Inventor: PARK HEE WON
IPC: F04D29/04
Filed: 2002-03-05
Abstract: PURPOSE: A rotational shaft coupling system for a sea water pump is provided to improve corrosion-resistance characteristic of a rotational shaft system by coupling a second rotational shaft made of titanium to a first rotational shaft. CONSTITUTION: One side of a first rotational shaft(110) of a motor is press-fitted into a rotor(13) and the other side of the first rotational shaft(110) is formed with a bolt hole. The bolt hole is formed with a thread section, which is formed in opposition to a rotational direction of the motor for preventing the first and second rotational shafts(110,120) from being separated. The second rotational shaft(120) is made of titanium and has a sectional area larger than a sectional area of the first rotational shaft(110). The second rotational shaft(120) is provided at one side thereof with a coupling protrusion(121) coupled to the first rotational shaft(110).
Patent KR-20030072158-A (KR)
Title: Manufacturing for Kimchi
Inventor: HONG CHUN JA
IPC: A23B7/10
Filed: 2002-03-05
Abstract: PURPOSE: Provided is a method for manufacturing kimchi by using a sea tangle solution and a mixed seasoning of crushed potato, ginger, welsh onion, and the like, rather than fermented and salted fish. CONSTITUTION: A method for manufacturing kimchi comprises the steps of: boiling sea tangle with unpolished rice flour in water to give a sea tangle solution; mixing onion, dropwort, pepper, garlic, ginger and the like to give a seasoning; crushing potato; and mixing the above ingredients together and stuffing the mixture thereof into salted chinese cabbage.
Patent KR-20030073097-A (KR)
Title: Underground wireless relay apparatus used optical fiber cable
Inventor: YANG YOUNG SUK
IPC: H04B10/29
Filed: 2002-03-08
Abstract: PURPOSE: An underground wireless repeater device using an optical line is provided to receive a sky wave by using one receiving antenna, and to transmit the sky wave to many underground wireless repeater devices through the optical line, thereby maintaining the same field strength at any underground places. CONSTITUTION: A receiving antenna(18) is installed on the ground, and receives a sky wave. A photoelectric converter(50) converts a high frequency signal received from the receiving antenna(18) into an optical signal. An optical line(60) transmits the optical signal outputted from the photoelectric converter(50). Many repeaters(24,25,26) are connected to the optical line(60), respectively, and convert the optical signal into a high frequency signal to relay the high frequency signal. Many transmitters(34,35,36) are connected to the repeaters(24,25,26), respectively, and radiate output signals to an underground space.