baber/WOPTO huggingface dataset:
Patent KR-20030050878-A (KR)
Title: A Nozzle for Cooling Slab for Consecutive Casting
Inventor: AHN HUI DONG
IPC: B22D11/055
Filed: 2001-12-19
Abstract: PURPOSE: A spraying nozzle for cooling a slab is provided to optimally feed cooling water and to improve quality of the slab by improving a performance of a cooling water spraying nozzle. CONSTITUTION: A cooling water spraying nozzle includes a spraying nozzle body(11), a filter unit(21), a nozzle holder(23), a differential pressure detecting device(20) and an elbow(22). The spraying nozzle body(11) has first and second cooling water feeding ports. Water paths are formed in the spraying nozzle body(11) in order to spray cooling water of the first port through a nozzle hole. The first and second ports are separated from each other by the filter unit(21), which filters cooling water. The spraying nozzle body(11) is fixed by the nozzle holder(23). The differential pressure detecting device(20) detects pressure in the second port and generates an alarming sound. Cooling water is supplied into a cooling water feeding path through the elbow(22).
Patent KR-20030051935-A (KR)
Title: An apparatus for preventing the damage of hot colling system in heating furnace
Inventor: LEE JAE GYU
IPC: B21B37/76
Filed: 2001-12-20
Abstract: PURPOSE: A cooling system protecting apparatus used in a heating furnace is provided to protect a cooling system installed in the heating furnace by preventing a sight glass flowmeter from being broken due to high-pressure and high-temperature steam in a working beam formed in the heating furnace. CONSTITUTION: A cooling system protecting apparatus includes a main body(10), a pressure adjusting member(30) and a temperature detecting section(50). The main body(10) is interposed between a flexible hose and a sight glass flowmeter and has upper and lower fluid paths(11,12). The pressure adjusting member(30) elastically supports a poppet(31) in a downward direction and has a needle stopper(35), which moves forwards when the poppet(31) moves upwards caused by steam introduced through the upper fluid path(11). The temperature detecting section(50) is detachably coupled to a lower portion of the main body(10).
Patent KR-20030052490-A (KR)
Title: Electrostatic discharge protection circuit
Inventor: CHO SU MIN
IPC: H01L27/04
Filed: 2001-12-21
Abstract: PURPOSE: An ESD(Electro-Static Discharge) protecting circuit is provided to be capable of improving ESD characteristic by forming the first ESD protecting circuit used at a RY/BYb pin having the same structure as the second ESD protecting circuit used at a DQ pin. CONSTITUTION: An ESD protecting circuit is provided with a predetermined pin(41), the first field transistor(F41) connected between the first power supply terminal and the pin, the second field transistor(F42) connected between the pin and the first ground terminal, a resistor(R41) connected with the pin, a PMOS transistor(P41) connected between the second power supply terminal and the resistor, an NMOS transistor(N41) connected between the resistor and the second ground terminal, and an inverter(I41) connected with a gate terminal of the PMOS transistor. Preferably, a RY/BYb pin is used as the pin.
Patent KR-20030054479-A (KR)
Title: A jig for connecting a shielding gas nozzle in a laser welder
Inventor: LEE JONG BONG
IPC: B23K26/14
Filed: 2001-12-26
Abstract: PURPOSE: A jig used for coupling a shielding gas nozzle is provided to perform a shielding gas spraying work while variously changing a spraying angle of shielding gas in horizontal, vertical and circumferential directions. CONSTITUTION: A jig includes a guide block(20) and a nozzle supporting block(40). The guide block(20) is installed at a lateral portion of a welder head(51) and has a horizontal body formed with a horizontal guide hole, and a supporter downwardly extending from the horizontal body. The nozzle supporting block(40) is mounted on the guide block(20) in such a manner that an installation angle of the nozzle supporting block(40) is adjustable in a circumferential direction with respect to the guide block. The guide block(20) is formed with a coupling protrusion. First and second screw holes are formed between the lateral portion of the welder head(51) and the guide block(20).
Patent KR-20030055587-A (KR)
Title: Apparatus for removing of floating oil
Inventor: KANG SEONG SIN
IPC: B21B45/02
Filed: 2001-12-27
Abstract: PURPOSE: A floating oil removing apparatus is provided to prevent environment from being contaminated due to waste oil by preventing a rubber plate from making contact with a hopper table. CONSTITUTION: A floating oil removing apparatus includes a container(12) rotatably installed at an upper portion of a waste oil pit, a lifting device for moving the container(12) up and down, a rotating device for rotating the container(12), an oil discharging device for discharging oil from the container(12), and a control device for controlling rotation of the rotating device by detecting a level of waste oil. The container(12) has a semi-spherical sectional shape and a bottom of the container(12) is inclined. A bracket(14) is installed at both upper ends of the container(12) in order to install the lifting device and the rotating device. A drain pipe is installed at one side of the container(12) in order to drain floating oil. A lifting cylinder(20) is fixed to a lower portion of a plate(18).
Patent KR-20030056322-A (KR)
Title: Image sensor having shal
Inventor: KO HO SUN
IPC: H01L27/146
Filed: 2001-12-28
Abstract: PURPOSE: An image sensor with trench-type isolation is provided to be capable of minimizing failure due to well formation and increasing capacitance of a photodiode. CONSTITUTION: A plurality of photodiodes(PD) is formed in a semiconductor layer of the first conductive type. A well(P-well) of the first conductive type is formed in the semiconductor layer located between the photodiodes(PD). A filed insulating layer(Fox) of a trench structure is formed in the semiconductor layer located between the photodiode(PD) and the well(P-well). At this time, the depth of the well is same to the depth of the field insulating layer(Fox).
Patent KR-20030057055-A (KR)
Inventor: LEE CHANG HUI
IPC: H04B1/16
Filed: 2001-12-28
Abstract: PURPOSE: A receiver of a mobile communication system is provided to receive two bandwidths by using a duplexer, and to process a digital signal, thereby remarkably reducing elements of an intermediate frequency as reducing errors without another tuning process. CONSTITUTION: Low noise amplifiers(21,22) amplify high frequency signals inputted through a receiving antenna in low noise, and output the amplified signals. Analog to digital converters(30,31) convert analog output signals of a frequency down converter(40) into digital signals, and output the digital signals. An AGC circuit(50) down-controls frequencies of each channel by separating channels of the digital signals, reduces bandwidths as filtering the signals, and controls gains. Monitors(32,33) monitor output signals of the AGC circuit(50), and decide whether an error is generated.
Patent KR-20030057870-A (KR)
Title: Method for Managing Resource in ATM Exchange System
Inventor: CHOI SEUNG WON
IPC: H04L12/50
Filed: 2001-12-29
Abstract: PURPOSE: A method for managing sources in an ATM(Asynchronous Transfer Mode) exchange is provided to allocate a VP(Virtual Path) port to a sub-port of a logical port in case that a logical port is allocated in a PVC(Permanent Virtual Connection) and then divide and use one physical port by several protocols, thereby maintaining independence between each protocol and using effectively sources of a port maximally. CONSTITUTION: In a basic structure of an ATM exchange, one physical port is divided into several logical ports. While the physical port relates to a shape and an alarm of the exchange, the divided ports manage system resources. The corresponding logical port is classified by a VPI(Virtual Path Identifier) range. In logical ports divided from one physical port, ranges of VPI values are not overlapped. A use protocol is designated to the corresponding logical port. A user can access the corresponding designated logical port through the designated protocol. Accordingly, several protocols can perform the corresponding services through the list of logical ports allocated to the respective protocols.
Patent KR-20010072092-A (KR)
Title: 기판을 프로세싱하기 위한 장치 및 방법에 알맞은 세라믹복합물
IPC: H01J37/32
Filed: 1999-07-26
Abstract: 기판이 프로세스 가스의 프라즈마에서 처리되는 반응챔버의 프로세스 키트 및 유전창에 대한 세라믹 복합물이 개시된다.  세라믹 복합물은 세라믹 화합물(예를 들어, Al 2 O 3 )과 3B족 금속의 산화물(Y 2 O 3 )을 포함한다.  프로세스 가스의 플라즈마를 포함하는 챔버의 기판을 처리(예를 들면, 에칭)하는 방법이 개시된다.  상기 방법은 세라믹 복합물로 형성되는 유전창을 통하여 프로세싱 파우더가 통과하는 단계를 포함한다.
Patent KR-20010072786-A (KR)
IPC: B41J2/135
Filed: 1999-08-24
Abstract: Nozzle plate for a drop on demand printer having a coating formed of fused particles of fluorinated ethylene propylene copolymer. The coating, which offers a low surface energy and good resistance to wear is formed on a laser ablatable material and has an average thickness of at least 200 nm but not greater than 600 nm.
Patent KR-20010087205-A (KR)
IPC: G01N30/02
Filed: 1999-08-30
Abstract: 본 발명은 몇 종류의 유체와, 1종 이상의 주유체와, 2종 이상의 부유체를 수집, 분배, 혼합 또는 추출하기 위한 장치(DME) 또는 패널에 관한 것으로, 주유체(3, 9) 수집 수단과, 부유체를 통과시키는 2개 이상의 주입 및/또는 추출 라인(6, 7)과, 이들 주입 및/또는 추출 라인과 오리피스 또는 통로(6I, 7I)를 통해 연통하는 2개 이상의 혼합 챔버(11a, 11b)와, 이 혼합 챔버로부터의 유체를 재분배하는 재분배 수단(12, 4)과, 상기 수집 수단 및 재분배 수단을 분리하는 분리 수단(5a, 5b)을 포함하며, 상기 추출 라인(6, 7)은 서로 상하로 위치하고, 상기 혼합 챔버(11a, 11b)는 이들 추출 라인의 각 측부에 위치하며 주입 기능을 행하는 오리피스에 대해 대칭적이다.  본 발명은 모사 가동층에서 파라크실렌을 분리하는 공정에 효과적으로 사용될 수 있다.
Patent KR-20010108096-A (KR)
IPC: G11C11/14
Filed: 2000-01-03
Abstract: 본 발명은 MRAM용 판독-/기록 아키텍처에 관한 것이다.  본 발명에 따른 판독-/기록 아키텍처는 판독 프로세스 동안 저항 브리지를 사용하는데, 상기 저항 브리지내에서 공지된 자화 상태를 갖는 하나의 메모리 셀은 측정될 하나의 메모리 셀과 비교된다.
Patent KR-20010101611-A (KR)
IPC: C07D409/14
Filed: 1999-12-21
Abstract: 본 발명은 하기 화학식 I의 라스-파르네실트란스퍼라제 억제제 또는 제약학적으로 허용되는 그의 염과 술포부틸에테르-7-β-시클로덱스트린 또는 2-히드록시프로필-β-시클로덱스트린으로부터 형성된 라스-파르네실트란스퍼라제 억제제 착물에 관한 것이다. 
     <화학식 I> 
     
       
     
     상기 식 중, n은 0 또는 1이고; R 1 은 Cl, Br, 페닐, 피리딜 또는 시아노로부터 선택되고; R 2 는 아르알킬이고; R 3 은 저급 알킬, 아릴 또는 치환 아릴 또는 헤테로시클로로부터 선택되고; Z 1 은 CO, SO 2 , CO 2 또는 SO 2 NR 5 {여기에서, R 5 는 수소, 저급 알킬 또는 치환 알킬로부터 선택된다}로부터 선택된다.  상기 착물에서는 라스-파르네실트란스퍼라제 억제제의 수용해도가 예상외로 높고, 암에 걸린 인간에게 정맥내 전달하기에 유용하다.  또한 상기 착물을 형성하는 방법을 제공한다.  라스-파르네실트란스퍼라제 억제제는 항암제로서 유용하다.
Patent KR-20020023939-A (KR)
Title: 리바비린에 의해 면역 반응을 조절하는 방법
IPC: A61P37/02
Filed: 1999-12-20
Abstract: 본 발명은 시험투여의 효과에 반하는 B7 마커상의 효과를 가지도록 선택된 농도로 누클레오시드를 면역계에 제공함으로써 변경된 상기 시험투여에 대한 면역계의 반응에 관한 것이다.  고찰된 시험투여에는 알레르기유발원, 신생물, 바이러스, 세균, 침습 및 자가면역 반응이 포함된다.  특히 관심있는 분자 마커는 B7-1 및 B7-2이다.  바람직한 누클레오시드는 B7 마커를 발현시키는 세포를 함유하는 유체중에 특히, 각각 약 0.2 μM 내지 약 5 μM의 농도 이내로 제공된 리바비린 및 리바비린 유사체이다.
Patent KR-20020008842-A (KR)
IPC: A61F2/28
Filed: 2000-04-20
Abstract: 본 발명은 척추체 또는 관상골을 적어도 부분적으로 생성시키거나, 재생시키거나 또는 안정화시키기 위한 이식재에 관한 것이다.  당해 이식재에 있어서, 금속, 비금속 또는 세라믹 중공체는 활성 물질 복합체로 피복되어 있거나, 당해 활성 물질 복합체를 포함한다.  당해 활성 물질 복합체는 서로 상이하고 골 생성에 특이적으로 적합한 다음 성분들, 즉 생성시킬 골 세포에 특이적으로 적합한 세포외 물질을 기재로 하는 1종 이상의 구조 성분, 1종 이상의 보충 성분, 1종 이상의 유착 성분 및 1종 이상의 성장 및/또는 성숙 성분을 포함한다.  금속 중공체는 바람직하게는 티탄 또는 티탄 합금으로 이루어져 있고, 격자 구조를 갖는 원통형으로 제조된다.  비금속 중공체는 탄소 섬유로 이루어지고, 세라믹 중공체는 인산칼슘, 산화알루미늄 또는 수산화인회석 세라믹으로 이루어진다.  활성 물질 복합체의 필요량을 감소시키기 위해, 당해 활성 물질 복합체를 중합체 및 콜라겐으로부터 선택된 지지재에 도포할 수 있다.
Patent KR-20020007388-A (KR)
IPC: H02K33/02
Filed: 2000-04-19
Abstract: 전자기 액추에이터는 전기자가 강자성회로의 폴에 대하여 지지하는 두개의 최대 위치들 사이에서 로드를 축방향으로 구동하는 강자성 재료의 전기자(22)를 위한 축방향 이동 간격을 한정하는 강자성 회로를 하우징에서 구비하고, 탄력성 있는 복귀 수단은 최대 위치들 사이의 중간 위치에서 정지하여 밸브를 지지하기 위하여 제공되며, 적어도 하나의 코일이 회로에 의해 운반되고 전기자가 두 위치내로 선택적으로 이끌어지는 것이 가능하다. 로드 전기자의 이동거리 만큼의 길이의 방사상으로 자기화된 바를 운반하고, 하우징은 코일에 의해 발생된 장(場)에 약하게 노출되는 영역에서 위치된 적어도 하나의 자기 플럭스 센서를 운반한다.
Patent KR-20020020706-A (KR)
IPC: B23B31/11
Filed: 2000-06-08
Abstract: 본  발명의  가공공구는  사용수명을  증가시키기  위하여  동체(2)의  스피거트(4)와  이에  대응하는  나이프  헤드(5)의  삽입공(6)이  적극  및  비적극형의  연결이  이루어질  수  있도록  나선부(7)와  압입부(8)를  갖는다.          또한,  동체(2)의  압입부(8)에  나이프  헤드(5)의  압입부(8)가  수축결합되는  대경부(9)가  형성되어  있다.
Patent KR-20030059877-A (KR)
Inventor: PARK YONG CHUL
IPC: F24C15/20
Filed: 2002-01-03
Abstract: PURPOSE: A cavity ventilation structure is provided to achieve improved use convenience by forming a smooth air flow in the cavity of a microwave oven. CONSTITUTION: A ventilation structure comprises a pair of inlet units(52,54) arranged at both sides of the front portion of a cavity top surface(50) in such a manner that the inlet units are communicated to a cavity of a microwave oven; and a pair of ventilation units(56,58) arranged at both sides of the rear portion of the cavity top surface in such a manner that the ventilation units are positioned in the vicinity of ventilation fans(72,74). An ambient air flows into the cavity through the inlet units by the operation of the ventilation fans, and the air existing in the cavity is ventilated through the outlet units and a ventilation motor assembly(70).
Patent KR-20020062222-A (KR)
Title: Unmanned retail store system and method of purchasing goods
Inventor: OHTA AKIMASA
IPC: G06Q30/04
Filed: 2002-01-18
Abstract: PURPOSE: To provide an unmanned retail store system for allowing a purchaser who purchases merchandise to receive the purchased merchandise from an unmanned warehouse. CONSTITUTION: This unmanned retail store system is constituted by connecting a user side information terminal, a retail store side information terminal, and a settlement organization side information terminal through a network. The user side information terminal is provided with a means for selecting merchandise to be purchased, and for transmitting the information of the selected merchandise to the retail store side information terminal and a means for transmitting the information of a settlement account to the retail store side information terminal. The retail store side information terminal is provided with a merchandise warehouse and a means for transmitting the withdrawal request information of the purchase price of the merchandise and the transfer request information of the purchase price to the account of the retail store to the settlement organization side information terminal. The settlement organization side information terminal is provided with a means for preparing a password for unlocking the key of the merchandise warehouse in which the purchased merchandise is housed and means for transmitting the password to the user side terminal and the retail store side information terminal.
Patent KR-20020063512-A (KR)
Inventor: ISHII MASAHIRO
IPC: G02F1/1343
Filed: 2002-01-28
Abstract: PURPOSE: To suppress an after image. CONSTITUTION: A pixel region of a side of liquid crystal of one of boards oppositely disposed through the liquid crystal is provided with a thin film transistor driven by supplying a scanning signal from a gate signal line, a pixel electrode supplied with an image signal from a drain signal line through the thin film transistor and an opposite electrode for generating an electric field between the opposite electrode and the pixel electrode. The opposite electrode is formed on an upper layer of the pixel electrode through a stacked insulating film. The stacked insulating film is provided with a protecting film comprising an insulating film and a protecting film which is a sequentially stacked element of an inorganic material layer and an organic material layer. A gate insulating film is a part of the insulating layer. The opposite electrode comprises a plurality of strip electrodes extending in one direction and intersecting in another direction. The pixel electrode comprises a transparent planate electrode formed in a major part of the pixel region.
Patent KR-20020069474-A (KR)
Inventor: BRENNAN JOSEPH MICHAEL
IPC: C07C409/34
Filed: 2002-01-31
Abstract: PURPOSE: Provided is novel thermally-stabilized initiator compositions comprising dialkyl peroxydicarbonates stabilized by the addition thereto of a stabilizing effective amount of at least one stabilizing compound selected from the group consisting of diesters of unsaturated dicarboxylic acids. CONSTITUTION: The composition comprises a dialkyl peroxydicarbonate containing a stabilizing effective amount of at least one compound having the formula(1), where R1 and R2 are the same or different and are selected from the group consisting of alkyl of 4 to 20 carbons, cycloalkyl of 6 to 10 carbons, aryl of 6 to 10 carbons, aralkyl of 7 to 11 carbons, and mixtures thereof.
Patent KR-20020064209-A (KR)
Title: Abnormality detection method and protection apparatus
Inventor: TAKEHARA NOBUYOSHI
IPC: G01K7/42
Filed: 2002-01-31
Abstract: PURPOSE: An abnormality detection method and a protection apparatus are provided to detect abnormal heating at an arbitrary position in a device. CONSTITUTION: A method of detecting temperature abnormality of a device comprises the steps of acquiring temperature data from a plurality of temperature sensors distributed in the device(s11), acquiring a parameter indicating a temperature distribution pattern in the device on the basis of the acquired temperature data(s13), and outputting, when the acquired parameter deviates from a predetermined parameter indicating a temperature distribution pattern, a signal indicating temperature abnormality of the device(s15).
Patent KR-20030066089-A (KR)
Title: Method of manufacturing liquid crystal display apparatus
Inventor: CHO JONG HWAN
IPC: G02F1/13
Filed: 2002-02-04
Abstract: PURPOSE: A method for manufacturing a liquid crystal display is provided to reduce the number of pattern masks required for forming an organic insulating film having an uneven structure, thereby reducing an inferior rate. CONSTITUTION: A non-photo sensitive material(160) including a plurality of photo sensitive particles(161) is applied on a first substrate(110). The plurality of photo sensitive particles are exposed. The exposed plurality of photo sensitive particles are developed. The non-photo sensitive material from which the photo sensitive particles have been removed is thermally processed to form an organic insulating film having an unevenness structure. A reflective electrode is formed on the organic insulating film in a uniform thickness. A second substrate is aligned. Liquid crystal is interposed between the first substrate and the second substrate.
Patent KR-20030067050-A (KR)
Title: Cosmetic Compositions Comprising Lactate and Ramulus Mori Extracts for Skin Whitening
Inventor: CHO BYEONG GI
IPC: A61K8/36
Filed: 2002-02-06
Abstract: PURPOSE: A cosmetic composition containing as an effective ingredient lactate and Ramulus mori extracts in a specified ratio is provided. Therefore, it is improved in skin stability while showing synergistic skin-whitening effect as compared to the cosmetic composition containing lactate or Ramulus mori extracts alone. CONSTITUTION: The skin-whitening cosmetic composition comprises: 1 to 20% by weight of 60%(w/w) of lactate such as sodium lactate; 0.0001 to 10% by weight of Ramulus mori extracts and conventional components such as an antioxidant, a stabilizer, a solubilizing agent, vitamins, a pigment, a fragrance material and a carrier. The composition has very low dermal irritation properties.
Patent KR-20030067071-A (KR)
Title: Rotary motor and force feedback device with the same
Inventor: KIM YONG IL
IPC: H02K7/00
Filed: 2002-02-06
Abstract: PURPOSE: A rotary motor having high torque and a direct driving type force feedback device using the same are provided to perform a rotational motion of the low speed and the high torque by improving a control method of an existing vehicle simulator. CONSTITUTION: A force feedback device(10) includes a rotary motor(12) and a force transfer member. The rotary motor includes a rotor(20) and a stator(18). The force transfer member is connected to the rotor of the rotary motor. The rotative speed of the force transfer member is equal to the rotative speed of the rotor. The stator includes a yoke(50) having opposite walls(54,56) and a permanent magnet(28). The opposite walls are extended to a circumference direction along a concentric circle. The permanent magnet is adhered on one or more sides of the opposite walls. The rotor includes a plurality of coil members(36,38) having a couple of driving coil portions and a connection coil portion.
Patent KR-20030068727-A (KR)
Title: Working robot, actuator therefor and control method therefor
Inventor: CHO CHANG HYEON
IPC: B25J17/02
Filed: 2002-02-16
Abstract: PURPOSE: A working robot and an actuator for the working robot are provided to perform desired working by locating a tool at a working position. CONSTITUTION: A working robot is composed of a robot body(10), an actuator(20) mounted on the free end of the body, and a control unit(40). A tool mounted unit is installed in the actuator, and moves a tool(30) on a working position. The control unit controls the body, actuator, and tool.
Patent KR-20020069484-A (KR)
Inventor: CHEN PING
IPC: H01R13/64
Filed: 2002-02-19
Abstract: PURPOSE: To provide a connector assembly with a lock mechanism wherein lock holding power and locking strength of male and female housings can be enhanced, wherein a click feeling in a fitting connection can be strengthened and wherein it is effectively prevented that an electric wire of other harnesses is caught on a pressure-operating lever. CONSTITUTION: This connector assembly with the lock mechanism consists of a fitted and connected pair of a male connector 1 and a female connector 2, wherein a locking protrusion 23 is installed at an outer side face of one connector housing (the female housing) 4, wherein a lock arm 10 having a locking claw 11 to be locked to the locking protrusion 23 is installed at the outer side face of the other connector housing (the male housing) 3 via leg parts 13, 13 of a hinge state to be elastically deformed and wherein the pressure- operating lever 12 is installed at a rear end part of a lock arm 10 extending backward from the leg parts 13, 13 of the hinge state. Auxiliary elastic arms 14, 14 extending forward on a downward inclination are successively installed at the rear end part of the lock arm 10, and the tip end part of the auxiliary elastic arms 14, 14 is connected with the outer side face of the male housing 3.
Patent KR-20020025935-A (KR)
Inventor: KWON YEONG GIL
IPC: F24H1/20
Filed: 2002-03-04
Abstract: PURPOSE: A method and apparatus for heating water in a swimming pool are provided to increase maximally energy efficiency by simplifying a structure of a heating apparatus and to provide a smooth convection of the water without installing another convection apparatus. CONSTITUTION: A method and apparatus for heating a water comprises a plurality of heating member(11,12) for heating directly a water, a plurality of groove(20) for placing the heating member(11,12) and a variable resistor(40) controlled by a resistance control unit(60). The heating member(1,12) composed of a coil and the groove(20) are placed in horizontal according to a shape of the swimming pool and the heating member is connected to the variable resistor(40). The water(70) in the swimming pool is contacted with the plurality of the heating member(11,12) and the water in the swimming pool is heated according to a temperature sensed by the sensor(50) to become convection. If a water temperature difference of each position in the swimming pool is large, an output of a first heating member(11) larger than the output of a second heating member(12) is outputted, thereby obtaining a natural convection due to the temperature difference.