baber/WOPTO huggingface dataset:
Patent KR-20030028074-A (KR)
Title: platform system for management dispersed network systems and dispersion management method
Inventor: KIM CHEOL U
IPC: G06F15/16
Filed: 2001-09-27
Abstract: PURPOSE: A platform system for an integrated management of a distributed network system and a method for the integrated management are provided to integrally manage a network system which is distributed in remote places by automating the network system and to supply a platform system having a high security. CONSTITUTION: An encryption gateway(200) is connected to an integrated management server(100) through a local line. The encryption gateway(200) codes various kinds of messages being transmitted to a plurality of network devices(500) in the integrated management server(100). The encryption gateway(200) decodes a coded message being transmitted to the integrated management server(100) in the network device(500) and transmits the message to the integrated management server(100). A connection authentication server(300) is connected to the encryption gateway(200) and the integrated management server(100) through a local line. The connection authentication server(300) stores an ACL(access list) by replacing the network device(500) and executes an authentication procedure of a manager connected to the network device(500). An intrusion blocking server(400) blocks an unrecognized message out of messages being transmitted to the network device(500).
Patent KR-20020001670-A (KR)
Inventor: KIM CHEOL BIN
IPC: G01F15/00
Filed: 2001-09-25
Abstract: PURPOSE: A connector for a Water Gauge is provided to reduce parts by forming inlet and outlet grooves in a bolt member integrally, and to connect the water gauge to water pipes conveniently by assembling the bolt member with a nut member. CONSTITUTION: A connector connects a water gauge to water pipes. An inlet protruded pipe(11), an outlet protruded pipe(21) and a protrusion(30d) are formed integrally around a valve member(3). A nut member(4) having a threaded part(42) and a protrusion(40d) is combined with the upper part of the valve member, and inserted to a fitting protrusion(37) with a packing(30p). An inlet pipe(1) and an outlet pipe(2) are welded into the lower part of the valve member, and the upper parts of inlet and outlet pipes are contacted to packings(30p-1), and the packing is inserted to a fitting protrusion(37a). The coupler is welded in contacting to the packing for watertight inlet and outlet pipes. Assembling process and hours are reduced with integrally forming parts, and water is prevented from leaking with forming the coupler integrally.
Patent KR-20030037699-A (KR)
Title: airtight vessel for keeping herb medicine
Inventor: BYUN KI WON
IPC: A47J47/02
Filed: 2001-11-05
Abstract: PURPOSE: A herbal decoction storage container with closed structure is provided to store the herbal medicine decoction for a long time by preventing leakage or spoilage of decoction with fixing protrusions to sealing paper. CONSTITUTION: A herbal decoction storage container is composed of a container body(11) storing herbal medicine decoction, sealing paper(20) closing the interior of the body on the top of the container, and a lid closing the body. A sealing protrusion(10) is formed in the upper part of the container body, linearly contacted to the sealing paper and fixed by heating and pressing. The sealing protrusion has an inner periphery sill(12) and an outer periphery sill(13) formed in the upper part of the body, and a recess(14) formed between inner and outer periphery sills. The herbal medicine decoction is stored for a long time by preventing leakage of spoilage.
Patent KR-20030038007-A (KR)
Title: air suspension system for an automotive vehicle
Inventor: CHOI GI WAN
IPC: B60G17/052
Filed: 2001-11-08
Abstract: PURPOSE: A pneumatic suspension for a vehicle is provided to simplify an assembling process and to improve a lay-out by granting a function of a leveling valve to maintain a stable height of the vehicle with adjusting injection and exhaust of compressed air inside a pneumatic spring when a wheel of the vehicle is bumped and rebounded. CONSTITUTION: A pneumatic spring of a pneumatic suspension has a housing(38) and a leveling adjusting member(36). The housing has an injection port(38a) combined to a surge tank and an exhaust port(38b) combined to the outside to maintain a proper height of a vehicle by controlling injection and exhaust of compressed air. The leveling adjusting member has first, second and third combining pipes(40,42,44). The first combining pipe communicates a closed space formed by a bellows(34) with the injection port inside the housing. The second combining pipe communicates a lower portion of the first combining pipe with the exhaust port. The third combining pipe communicates closed spaces formed by the bellows by being branched from the second combining pipe. Thereby, an action of the leveling valve is operated by the leveling adjusting member of the pneumatic spring, and a structure of the pneumatic suspension is simplified.
Patent KR-20030039131-A (KR)
Title: Cam shaft apparatus
Inventor: KIM JAE CHUN
IPC: F01L1/04
Filed: 2001-11-12
Abstract: PURPOSE: A cam shaft apparatus is provided to achieve improved engine performance and fuel efficiency by permitting the valve lift area and valve timing to be varied in accordance with the engine speed. CONSTITUTION: A cam shaft apparatus comprises a hollow outer cam shaft(3); an outer cam(5) fixed to the outer cam shaft; an inner cam shaft(4) engaged with the outer cam shaft; an inner cam(6) fixed to the inner cam shaft, which has a cam profile same with the cam profile of the outer cam by moving along the movement of the inner cam shaft and corresponding to the outer cam, or increases a valve lift area by deviating from the outer cam; and an inner cam shaft advance unit(12) for controlling the outer cam and the inner cam to correspond to each other when the engine is at a low speed, and controlling the outer cam and the inner cam to be deviated from each other when the engine is at a high speed, by moving the cam shaft at a predetermined angle.
Patent KR-20030042827-A (KR)
Title: Shorten key designation method
Inventor: AHN GYE MYEONG
IPC: H04B1/38
Filed: 2001-11-24
Abstract: PURPOSE: A method for designating a hot key of a mobile terminal is provided to designate frequently-used words or sentences or bookmarks of a short message by a hot key, thereby quickly writing the short message or selecting a menu. CONSTITUTION: A user requests a short message to be designated by inputting a key signal for selecting a hot key designating character item(S10). A mobile terminal outputs hot key lists(S11). The user selects one of the hot key lists by a direction key, and inputs an OK key(S13). The mobile terminal decides whether the hot key selected by the user is preset. If not, the mobile terminal outputs an input screen. If the hot key is preset, the mobile terminal requests other hot key to be designated.
Patent KR-20030044700-A (KR)
Title: Connection of auxiliary packing device to docking station
Inventor: LIM YONG TAEK
IPC: G06F1/16
Filed: 2001-11-30
Abstract: PURPOSE: A device for connecting an extension device of a docking station is provided to improve a compatibility of the docking station by mounting/dismounting an auxiliary packing device necessary for connecting an external device to the docking station easily. CONSTITUTION: A packing device(30) installs the extension device. The first guide unit(34) is mounted at the lower portion of the packing device(30). The second guide unit(40) is formed at a correspondence surface of the first guide unit(34) at the lower surface of a docking station(10). A connection unit(35) is formed in the docking station(10) for a connection of the extension device. A fixing device(20) is provided for fixing the packing device(30). A door(14) is pivotally mounted in an incoming groove(12) of the packing device(30) at an external surface of the docking station(10). Elements of the fixing device(20) are described as follows. A fixing groove is formed at the lower portion of the packing device(30). A push button is mounted at an exterior of the docking station(10). A bar(28) is contacted with a fixing protrusion(21) in the fixing groove by an operation of the push button. An elastic unit(25) is mounted at the lower surface of the fixing protrusion(21).
Patent KR-20030045884-A (KR)
Title: Method for Call Connection Service For Extension Subscriber Private Exchange
Inventor: LEE SANG HO
IPC: H04Q3/10
Filed: 2001-12-03
Abstract: PURPOSE: A method of servicing a receiving call connection for an extension subscriber in a private exchange is provided to selectively perform a call forwarding process for an extension subscriber, thereby enabling many extension subscribers to share the same extension and easily confirming current positions of the subscribers. CONSTITUTION: A private exchange receives a mobile information input request for a call forwarding extension subscriber, and inputs mobile information for the subscriber(S301). The exchange receives a receiving call calling the subscriber, and forwards the receiving call by using a DB, depending on whether the same extension subscriber is one or more than one(S302). The exchange receives a position confirming request for the subscriber, and confirms a position of the subscriber(S303). The exchange receives a mobile information deletion request for the subscriber, and deletes the mobile information from the DB(S304).
Patent KR-20030050872-A (KR)
Title: Traffic control method in atm mobile communication system
Inventor: LEE SEONG YEONG
IPC: H04L12/28
Filed: 2001-12-19
Abstract: PURPOSE: A method for controlling traffic congestion of an ATM mobile communication system is provided to remove overhead in a normal operation and prevent data loss at a congested channel. CONSTITUTION: According to reception of data, it is judged whether a congestion alarm is received(S100-S110). If not, an existing circulating queue senses congestion(S120). If the congestion is not sensed, the data is inserted into the existing rotation queue and transmitted to a transmitting buffer descriptor(S130-S140). If the congestion is sensed, it is judges whether the congestion is first congestion or second congestion according to a size of a circulating queue of the current channel(S150). In the case of the first congestion, the size of the corresponding rotation queue is enlarged as much as a threshold preliminarily decided, and the data is inserted into the existing rotation queue and transmitted to the transmitting buffer descriptor(S160-S170). In the case of the second congestion, the data is inserted into the existing rotation queue and transmitted to the transmitting buffer descriptor and generates a bandwidth dynamic management table and a new rotation queue at the same time(S180-S200). In the state of connecting the existing rotation queue with the new rotation queue, the congestion alarm is generated(S210-S220). A bit rate per second is calculated every second and data transmitted from an application program is stored at the new rotation queue(S230-S240). The state of the existing queue is checked and the corresponding channel contents are removed from the bandwidth dynamic management table if the existing rotation queue is empty(S250-S260). The new rotation queue of the corresponding channel is deleted and the data is inserted into the existing rotation queue(S270-S280). If the existing rotation queue is not empty, the data of the existing queue is transmitted(S290).
Patent KR-20030050986-A (KR)
Inventor: LEE CHEOL UK
IPC: G02B26/06
Filed: 2001-12-20
Abstract: PURPOSE: A semiconductor optical modulator is provided to optionally compensate the loss of optical absorption to be generated when the divided light beams are phase modulated by adjusting the ratio of the optical division during the optical division. CONSTITUTION: A semiconductor optical modulator includes an input optical division region(105), an optical converging output region(101) and an optical phase modulation region(103) formed between the input optical division region(105) and the optical converging output region(101). The semiconductor optical modulator includes a substrate, a bottom electrode formed on the bottom surface of the semiconductor, an active layer, a cladding layer and a top layer. An optical wave guide(250) is formed in the form of ridge on the top of the cladding layer so as to guide the optical light beam.
Patent KR-20030051029-A (KR)
Title: Vision inducible traffic sign apparatus
Inventor: KIM AE YOUNG
IPC: E01F9/619
Filed: 2001-12-20
Abstract: PURPOSE: An optical guidance/indication device is provided to promote the safety of a worker by increasing the convenience on installation and maintenance and to give geometric information to drivers at night. CONSTITUTION: The optical guidance/indication device contains a C-shaped fixed frame(6) fixed to a wall structure of a road by a fixing bolt, a fixture fixing the fixed frame(6) to the wall structure, and a reflector(7) attached to the fixed frame(6) to reflect the light of a headlight.
Patent KR-20030052321-A (KR)
Title: A Method of Preparing Iron Hydroxides By Using Slag Solution
Inventor: BAE U HYEON
IPC: C01G49/02
Filed: 2001-12-21
Abstract: PURPOSE: Provided is an economical production method of high purity iron hydroxides by reacting slag effluent generated from steelmaking industry with iron chloride. CONSTITUTION: The iron hydroxides such as Fe(OH)2, Fe(OH)3 and FeOOH are produced by reacting slag effluent(pH>=12) as an alkali source with iron compound such as iron chloride, iron nitrate or iron sulfate and preferably iron chloride, wherein the strong alkali effluent removes impurities(Si, Mg) generated from elution of CaO from slag. Fe(OH)2 is formed by reacting ferrous chloride(FeCl2) with slag effluent(>=pH7) in non-oxidizing atmosphere, and Fe(OH)3 and FeOOH are formed by reacting ferrous chloride(FeCl2) with slag effluent(pH2-4) in oxidizing atmosphere.
Patent KR-20030052392-A (KR)
Title: Forming device of fabric with silicon
Inventor: JUNG SANG MUN
IPC: D06M17/00
Filed: 2001-12-21
Abstract: PURPOSE: A forming device of silicone fabric is characterized by forming silicone into a sheet type and laminating the silicone sheet on fabric. CONSTITUTION: A forming device of the silicone fabric is comprised of: a former(10) forming silicone material into a sheet type; a combining device(20) laminating sheet(40) on fabric(41); and a heating device(30) uniting the fabric(41) and the sheet(40). The former(10) is comprised of: a material supplying drum(11) supplying the silicone raw material; a screw cylinder(13) transferring the silicone resin by pressurization of a high pressure hose(12); and an extruding mold(14) forming the resin into the silicone sheet(14). The combining device(20) is comprised of: a roller(21) for hanging the fabric(41) thereon; and pressure rollers(22) laminating the silicone sheet(40) on the fabric(41) unwounded from the roller(21). The heating device(30) is comprised of: rollers(31) transferring the laminated fabric; and a heater(32).
Patent KR-20030054934-A (KR)
Title: Apparatus and method of driving liquid crystal display device
Inventor: WOO YU TAEK
IPC: G02F1/133
Filed: 2001-12-26
Abstract: PURPOSE: An apparatus and a method for driving a liquid crystal display device are provided to minimize inference between adjacent data lines by compensating distortion of voltage charged in data lines with common voltage, thereby improving vertical cross talk. CONSTITUTION: A liquid crystal panel(46) has a plurality of liquid crystal cells arranged in a matrix form. A data driver(43) supplies video data signals to the liquid crystal panel. A gate driver(45) supplies gate signals to the liquid crystal panel. A timing controller(42) controls the data driver and the gate driver. A common voltage source(48) supplies common voltage(Vcom) to the liquid crystal panel. The data driver includes first and second multiplexers(62,64) time-dividing the video data signals and the common voltage every one horizontal period.
Patent KR-20030057656-A (KR)
Title: Method for fabricating of poly silicon Thin film transistor
Inventor: BAE JONG UK
IPC: H01L29/786
Filed: 2001-12-29
Abstract: PURPOSE: A method for fabricating a poly silicon TFT(Thin Film Transistor) is provided to improve a leakage current characteristic of the TFT by etching thinly a surface of an exposed buffer layer. CONSTITUTION: A buffer layer(102) is formed on a substrate(100). An amorphous silicon layer is deposited on the entire surface of the buffer layer including the buffer layer. A catalytic metal material is absorbed on an upper portion of the amorphous silicon layer. A poly silicon layer is forming by crystallizing the amorphous silicon layer. An active region(108) is defined on the poly silicon layer. An oxide layer pattern is formed thereon. The catalytic metal is removed from a lower portion of the oxide layer pattern by implanting n+ ions into the poly silicon layer and performing a thermal process. The exposed poly silicon layer is etched by using the oxide layer pattern as a mask.
Patent KR-20030058771-A (KR)
Title: A method of liquid crystal display device
Inventor: YE HAN SU
IPC: G02F1/136
Filed: 2001-12-31
Abstract: PURPOSE: A method for manufacturing a liquid crystal display is provided to prevent under-etching or over-etching of source and drain electrodes, and a semiconductor layer by preventing under ashing or over ashing of a photoresist layer. CONSTITUTION: A gate insulating layer(103), a semiconductor layer(105a), and a metal layer(107a) are accumulated on a substrate(101) where a gate electrode(102) is formed. A first photoresist layer is formed on the metal layer. A second photoresist layer is formed, having an ashing rate slower than an ashing rate of the second photoresist layer. First and second photoresist patterns(109,115) including a half-tone photoresist layer formed at a gate area are formed by using a diffraction mask. The meal layer and the semiconductor layer are etched by using the photoresist patterns. The half-tone photoresist layer is removed. Source and drain electrodes of the gate area and an impurity layer of the semiconductor layer are etched by using the photoresist patterns.
Patent KR-20010071022-A (KR)
Title: 여과된 호기 밸브를 구비한 안면 마스크
IPC: A62B31/00
Filed: 1999-01-07
Abstract: 본 발명은 적어도 착용자의 코와 입을 덮으며 호기 밸브를 포함하는 여과용 안면 마스크에 관한 것이다.  상기 호기 밸브는 착용자가 숨을 내쉬어 호기가 마스크의 내부에서 급속히 정화될 때 압력 증가에 응답하여 개방된다.  호기 필터 소자는 호기로부터 오염물을 제거하기 위해 호기 흐름에서의 여러위치중 한 곳에 위치된다.  상기 안면 마스크는 다습하고 더우며 CO 2 가 다량 함유된 호기를 마스크 내부로부터 밸브를 통해 급속히 배출하므로써 착용자에게 안락감을 제공하고, 착용자를 튕겨진 액체와 오염된 공기로부터 보호하는 동시에, 타인 또는 물건이 호기 흐름내의 오염물에 노출되는 것을 방지한다.
Patent KR-20010110291-A (KR)
IPC: H01L21/00
Filed: 2001-02-09
Abstract: 이중관구조의 반응관(1) 내의 웨이퍼보트(11)에 복수의 웨이퍼(W)를 선반형태로 얹어 놓고, 이들 반응관(1) 내의 각 존(6a,6b,6c)을 히터(4)의 가열부(4a,4b, 4c)에 의해 제 1 프로세스온도, 예를 들면 770℃까지 가열한다. 이어서 각 존(6a, 6b,6c)을 제 1 프로세스온도보다 낮은 제 2 프로세스온도, 예를 들면 750℃까지 온도를 하강시키면서 성막가스를 도입하여 성막을 행한다. 
     각 존(6a,6b,6c)을 제 1 프로세스온도까지 온도를 상승시키는 공정과, 제 2 프로세스온도까지 온도를 하강시키면서 성막가스를 도입하는 공정을 반복하여 행하면, 웨이퍼(W)의 둘레가장자리부의 온도가 중심부보다 낮은 상태에서 성막처리가 이루어져서, 웨이퍼(W)에 성막되는 막의 막두께의 균일성이 좋아진다. 
     또한 각 존(6a,6b,6c)에 있어서의 온도하강비율을 존마다 개별로 설정함으로써, 각 존에 있어서의 최적화된 성막처리를 달성할 수 있다.
Patent KR-20010075394-A (KR)
IPC: A61K38/01
Filed: 2000-07-25
Abstract: 본 발명은 물과 혼합되며, 식사전에 섭취되어 포만감을 연장시키므로써 식욕을 감소시키는 프로테이나제 억제제의 공급원을 제공하는 감자 추출물을 포함하는 건조 분말 형태의 영양 조성물에 관한 것이다.  본 발명의 영양 조성물은 약 10중량% 내지 약 80중량%의 단백질, 약 10중량% 내지 약 40중량%의 중쇄 내지 장쇄 지방산, 약 2중량% 내지 약 5중량%의 칼슘 염 및 약 0.02중량% 내지 약 5중량%의 감자 추출물에 의해 제공된 프로테이나제 억제제를 포함한다.
Patent KR-20010080271-A (KR)
IPC: H01L21/331
Filed: 1999-10-27
Abstract: 본 발명은 한 가지 유형의 다수의 능동 소자(NMOS1, NMOS2, NPN1, NPN2)를 가진 하나의 반도체 회로의 반도체 제조 방법에 관한 것이다. 상기 방법은, 반도체 기판(1) 상에 제 1영역(4, 16)을 배열하는 단계, 및 상이한 특성 집합을 가진 상기 유형의 두 능동 소자를 상기 제 1영역(4, 16)에 구현하는 단계를 포함한다. 상기 능동 소자를 구현하는 단계는 상기 제 1영역(4, 16)에 제 1(6', 10') 및 제 2(6", 10") 부영역을 생성하는 단계를 포함하며, 상기 단계는, 상이한 도즈 파라미터 집합을 가지며 유사한 유형(p)인 제 1불순물(P 1 , P 3 )과 제 2불순물(P 2 , P 4 )을 각각 상기 제 1영역의 제 1면적과 제 2면적 삽입하는 단계와, 상기 기판을 어닐링하여 각각 상기 제 1(6', 10') 및 제 2(6", 10") 부영역을 생성하는 단계를 더 포함함으로써, 상이한 도핑 프로파일을 가진 두 개의 부영역이 단일 집적 회로상에 제작될 수 있다.
Patent KR-20010099708-A (KR)
IPC: B29D23/00
Filed: 1999-10-20
Abstract: 본 발명은 회전 중공체(1)에 관한 것이며, 상기 중공체의 벽은 적어도 그의 외주상에서 단일  열가소성 유기 재료(A)로 만들어지는 내부 제 1 영역(a)과, 상기 제 1 영역(a)과 연속하도록 배열되며 상기 재료(A)와 동일한 열가소성 재료와 상기 열가소성 재료에 박힌 연속적인 유리 얀으로 만들어지는 제 1 부분(b)과 상기 중공체의 외주를 형성하며 단지 열가소성 재료만으로 만들어지는 제 2 부분(c)을 포함하는 제 2 영역을 포함한다. 
     본 발명에 따르면, 상기 벽은 0.5%보다 작은, 바람직하게는 0.2%보다 작은 공극 체적량(V v )을 갖는다.
Patent KR-20010075665-A (KR)
Inventor: HOUZE ERIC CHARLES
IPC: C09D161/28
Filed: 1999-10-26
Abstract: (a) an aqueous carrier medium; (b) pigment having a pH below 7.0; (c) an AB block copolymer pigment dispersant resin of 1) an A block of a hydrophobic polymer having amine groups and 2) a B block of a hydrophilic polymer having hydroxyl groups and carboxyl groups; the AB block copolymer has a number average molecular weight of 5,000-20,000 and contains 20-80 % by weight of a polymeric A segment and correspondingly 80-20 % by weight of a polymeric B segment; wherein the pigment and the dispersant are present in a pigment to dispersant weight ratio of 0.1/1 20/1; (d) a film forming polymeric binder containing carboxyl groups and (e) a crosslinking agent which on curing of the coating composition will react with the carboxyl and hydroxyl groups of the AB block copolymer and the carboxyl groups of the film forming polymeric binder. Pigment dispersions of the AB block copolymer and process for forming the dispersions also are part of this invention.
Patent KR-20010080702-A (KR)
IPC: C08L51/04
Filed: 1999-11-25
Abstract: 본 발명은 열가소성 폴리카르보네이트, 및 폴리카르보네이트 100 중량부당 0.01 내지 30 중량%의, 평균 입경 0.01 내지 20 ㎛의 규소 화합물을 함유하는 열가소성 성형 재료에 관한 것이다.
Patent KR-20020015016-A (KR)
IPC: G09F9/00
Filed: 1999-12-13
Abstract: 사용시 제1 편광 광을 방출하는 제1 광방출 영역 및 사용시 제1 편광 광과 상이한 제2 편광 광을 방출하는 제2 광방출 영역을 갖는 발광 디바이스가 개시되어 있다.
Patent KR-20010110346-A (KR)
Title: 편광을 사용하여 조직을 이미지화시키는 방법
IPC: G01N21/49
Filed: 2000-01-25
Abstract: 본 발명은 조직 이형성증을 검출할 목적으로 세포 핵 크기 분포를 측정하기 위해 상피 조직으로부터의 직접 후방산란광을 구별 검출하는 방법에 관한 것이다.  조직 표면으로부터 직접 후방산란된 광은 편광, 각 분포 또는 이둘 모두에 의해 하부 조직으로부터 후방산란된 광과는 구별된다.  포인트 측정 구현 및 이미지화 구현이 제시된다.  광의 전달 및 수집를 위한 고아학 시스템은 내시경 및 광섬유 시스템을 포함한다.
Patent KR-20010113719-A (KR)
IPC: C23C14/48
Filed: 2000-12-22
Abstract: 산화인듐주석의 코팅이 기판의 적어도 일부에 증착될 때까지 상기 기판에 인접하게 산소를 제공하는 이온 소스를 작용시키면서 부분 진공 환경에 기판을 제공하는 단계 및 산화주석 도핑된 산화인듐 입자의 전자 빔 증발을 실행하는 단계를 포함하는 기판상에 산화인듐주석의 투명성 코팅을 증착하기 위한 방법.
Patent KR-20010102487-A (KR)
Title: Method for monitoring weft yarn run/stop conditions
IPC: D03D51/34
Filed: 2000-03-01
Abstract: A method of monitoring the weft yarn run/stop conditions during each insertion cycle in a shuttle-less weaving machine like a rapier or projectile weaving machine by means of an electronic weft yarn feeler generating run output signals representing said weft yarn run condition, said weft yarn feeler including means to adjust the working sensitivity level, comprises that the present working sensitivity level effectively used for confirming run output signals continuously and automatically is adjusted during operation of the weaving machine to oscillate about an optimum and safe working sensitivity level by observing within a predetermined restricted observation interval of each insertion cycle the signal stability at an observation sensitivity level lower than the present working sensitivity level and by lowering or raising both said present working and observation sensitivity levels in dependence from output signal stability.