baber/WOPTO huggingface dataset:
Patent KR-20010015905-A (KR)
Title: 시멘트 제조용 킬른 설비 및 시멘트 제조방법
IPC: C04B7/43
Filed: 1999-01-26
Abstract: 본 발명은 시멘트 제조용 킬른 설비 및 시멘트 제조방법에 관한 것이다. 킬른 설비는 클링커를 연소하기 위한 킬른, 냉각기,  후속적인 분리 사이클론을 갖춘하소기 및 냉각기로부터 삼차 공기가 접선 방향으로 공급되는 연소격실로 이루어진다. 완전히 또는 부분적으로 하소된 물질은 연소격실의 저부로부터 하소기로 보내지며, 킬른으로부터 배기 가스가 또한 그곳으로 배출된다. 
     본 발명의 목적은  시멘트 제조용 킬른 설비 및 시멘트 제조 방법을 제공하는 것이다. 킬른 설비는 비교적 단순한 구조이며, 하소 영역에서 펫콕(petcoke), 무연탄 및 가스 함량이 낮은 기타 등급의 석탄 등의 반응성이 낮은 연료를 연소하는데 유리하다. 
     본 발명의 목적은, 버너 끝 밑에 그리고 접선 유입구의 상부 변부 위에 위치한 연소 격실의 내용적의 상부의 높이 h 1 -h 2 가 적어도 ⅓D 이고, 여기서 D는  높이 h 1 -h 2 와 연소격실의 상부 용적과 동일한 용적을 갖는 실린더의 직경이고, 접선 유입구의 하부 변부와 연소격실의 출구 사이에 위치한 연소 격실의 내용적의 하부의 높이, h 3 -h 4 가  적어도 D가 되도록 연소 격실의 접선 유입구를 위치시켜 달성한다. 연소 격실의 내용적의 상부의 높이, h 1 -h 2 는 적어도 ⅔D 이고,  연소격실의 내용적의 하부의 높이, h 3 -h 4 는 적어도 D인 것이 바람직하다.
Patent KR-20010040821-A (KR)
Title: 전자 방출 소자, 이의 제조 방법, 이의 구동 방법, 이전자 방출 소자를 사용한 이미지 디스플레이 장치 및 이의제조 방법
IPC: H01J9/02
Filed: 1999-02-09
Abstract: 전자 방출 소자는 적어도, 전자 이송부재(1), 전자 방출부재(3), 및 전자 이송부재(1)와 전자 방출부재(3) 사이에 형성된 전계집중 영역(2)을 포함한다.  예를 들면, 전자 이송부재(1)는 도전층일 수 있고, 전계 집중 영역(2)은 도전층 상에 형성된 절연층으로 형성될 수 있으며, 전자 방출부재(3)는 절연층 상에 제공된 입자들로 형성될 수 있다.  전계 집중 영역(2) 내 전계집중에 기인하여, 전자는 전자 이송부재(1)에서 전자 방출부재(3)로 쉽게 주입된다.
Patent KR-20010034605-A (KR)
Title: 방향족 복소환 유도체
IPC: A61P25/14
Filed: 1998-03-18
Abstract: 식 
     
       
     
     [식중, Z 는 하기의 각 식 
     
       
     
     (식중, Ar 1 은 페닐기 또는 할로겐원자 또는 탄소수 1 ~ 5 의 알킬기로 치환된 페닐기를 나타내고, R 2 는 탄소수 1 ~ 5 의 알킬기를 나타내고, Y 는 수소원자, 메르캅토기, 탄소수 1 ~ 5 의 알킬티오기, 아미노기 또는 1 또는 2 개의 탄소수 1 ~ 5 의 알킬기로 치환된 아미노기를 나타낸다) 로 표시되는 기를 나타내고, Ar 2 는 할로겐원자 또는 탄소수 1 ~ 5 의 알킬기, 탄소수 1 ~ 5 의 알콕시기, 수산기 및 트리플루오로메틸기에서 선택된 1 개 또는 2 개의 치환기를 가지는 페닐기 또는 페닐기를 나타내고, B 1 -B 2 는 CH-CO 또는 C=C(R 1 ) (식중, R 1 은 수소원자 또는 탄소수 1 ~ 5 의 알킬기를 나타낸다) 을 나타내고, n 은 1 ~ 4 의 정수를 나타낸다] 로 표시되는 방향족 복소환 유도체 또는 그의 의약상 허용되는 염.     상기  화합물은 추체외로 장해를  일으키지  않고, 항정신작용을  갖는 도파민  D 4 수용체 길항 화합물이다.
Patent KR-20010034836-A (KR)
IPC: A61B17/58
Filed: 1999-04-29
Abstract: The invention concerns a backbone osteosynthesis system comprising an elongated element, a vertebral screw, and a connecting element comprising two branches for clamping between them the linking element, at least one first branch being capable of being engaged onto the screw. The system comprises a second vertebral screw, the first branch having an extension capable of being engaged onto the second screw. The system may comprise a second elongated linking element.
Patent KR-20010043166-A (KR)
IPC: A61B17/70
Filed: 1999-04-29
Abstract: The invention concerns a backbone osteosynthesis system comprising an elongated element, a vertebral screw, and a connecting element comprising two branches for clamping between them the linking element, at least one first branch being capable of being engaged onto the screw. The system comprises a second vertebral screw, the first branch having an extension capable of being engaged onto the second screw. The system may comprise a second elongated linking element.
Patent KR-20010052459-A (KR)
Title: 혈관 수술용 방법 및 그 장치
IPC: A61F2/02
Filed: 1999-05-30
Abstract: 두 혈관을 부착시키키 위한 문합 커넥터(60)은, 루멘을 가진 원통형 부분, 두 단부, 셀 요소의 배열 및 하나 이상의 스파이크가 상기 원통형 부분의 두 단부의 하나에 인접하게 배열된 하나 이상의 스파이크 세트(64)를 포함하는 조직 결합 부분(60)을 포함한다.  상기 커넥터(60)은 상기 두 단부의 다른 쪽에 인접한 제2 스파이크 세트(66)을 가질 수 있다.
Patent KR-20010053117-A (KR)
Title: 투사 시스템
IPC: G02B27/18
Filed: 2000-04-12
Abstract: 투사 시스템은 적어도 2개의 광원들, 투사 렌즈 및 광원들과 투사 렌즈 사이에 위치하는 공간 광 변조기를 구비하며, 광 변조기는 각각 틸트축에 대해 비스듬히 기울일 수 있는 요소가 제공되는 다수의 광-편향 장치들을 구비한다.  광원들은 동작시 광원들로부터 들어와서 각 요소 상에 투사되는 광빔들의 중심들이 요소의 틸트축과 실질적으로 평행하게 연장되는 투사 라인 상에 위치되는 것과 같은 방법으로 공간 광 변조기에 대해 배치된다.
Patent KR-20020060297-A (KR)
Title: HBT(Hetero-Bipolar Transistor) device and method for fabricating the same
Inventor: LEE GWANG JIN
IPC: H01L21/76
Filed: 2001-01-10
Abstract: PURPOSE: A hetero junction bipolar device and a manufacturing method thereof are provided to reduce a contact area between a base and a collector and improve the operation speed by contacting between the base and a metal electrode on an STI(Shallow Trench Isolation) of an active region. CONSTITUTION: The device includes a semiconductor substrate(10), an epitaxial layer(12) growing on the substrate, the first STI(14a) formed on a device isolation region on the epitaxial layer, a plurality of the second STIs(14b) formed on an active region on the epitaxial layer, a base(16) of a thin film shape formed on the result including the first and the second STI, an emitter(18) of a conductive material formed on the base over the active layer, the first metal electrode(22a) respectively connecting to the emitter, and the second metal electrode(22b) respectively connecting to the base of the first and the second STI.
Patent KR-20020061341-A (KR)
Title: The remote gaming system with various microrobot on internet
Inventor: CHO SEUNG HWAN
IPC: G06Q50/10
Filed: 2001-01-16
Abstract: PURPOSE: A system for a remote robot toy game on the Internet is provided to enable users to enjoy various games by transmitting operations with respect to a number of robot toys arranged in an actual game station to computers connected to a web server through the Internet by a web camera of the web server and operating the robot toys. CONSTITUTION: An actual game station(20) has an inherent ID, a wireless receiving module for receiving a wireless signal, and at least one robot toy. At least one web camera(30) is provided for capturing the actual game station(20) as a real time image having various angles. An image distributor(40) distributes and transmits an image from the web camera(30). A plurality of user computer(50) is connected to a main control web server through the Internet by an input device for operating a remote game of a robot toy and a received IP and generates a control code signal in accordance with a game operation. A cam server(60) has a video capture module for receiving an image from the image distributor(40) and a central processing unit for transmitting an image being received to the video capture module to a user computer and transmitting the control code signal from the user computer(50). A main control web server(70) connects the cam server(60) by a hub and controls a connection to the cam server(60) corresponded to a static IP of the user computer(50). A wireless conversion unit(80) includes an interface unit for receiving the control code signal of the cam server(60) and a wireless transmission module for converting the control code signal into a wireless signal and transmits the wireless signal to the wireless receiving module of the robot toy. The static IP of the user computer(50) and the inherent IP of the are matched.
Patent KR-20020062447-A (KR)
Title: The method for sensing drying quantity
Inventor: KIM SANG DU
IPC: D06F58/28
Filed: 2001-01-20
Abstract: PURPOSE: A method for sensing an amount of clothing to dry in a clothing drying machine is provided to simply determine the clothing amount by an electrode sensor without any additional components, thereby improving the operation efficiency of the drying machine. CONSTITUTION: In a method for sensing an amount of clothing to dry in a clothing drying machine including an electrode sensor for determining dryness of clothing by contacting the clothing when a drum is rotating, the amount of the clothing is determined by how many times a voltage value generated by the electrode sensor is changed when the clothing contacts the electrode sensor, wherein if the change frequency of the voltage value is proportional to the amount of the clothing.
Patent KR-20020066723-A (KR)
Title: Method for monitoring state of subscriber's port by using bug
Inventor: EO YUN GUK
IPC: H04Q1/20
Filed: 2001-02-13
Abstract: PURPOSE: A method for monitoring the state of a subscriber port using a bug is provided to decrease the waste of a core according to the use of the core by interlocking a timer interrupt function to the bug and collecting the states of the subscriber ports. CONSTITUTION: In a state in which error information is stored in a memory, a user application catches an error information value and judges whether the caught error information value is greater than a reference value for generating an alarm(201). If the error information value is greater than the reference value, the user application recognizes that fault is generated in a subscriber 0 port among subscriber ports(203). The user application reads a bug which counts a value of a timer and checks whether a random time(2 seconds) elapses for grasping a fault generation maintenance time elapses during the random time(204). If the fault is generated in the subscriber 0 port and the fault generation maintenance time elapses, the user application judges whether fault generation information according to previous fault generation is notified to an operator terminal through a subscriber control board(206). If fault generation information according to the previous fault generation is notified to the operator terminal, the user application requests that subscriber information is provided to the subscriber port through the bug(208).
Patent KR-20020071281-A (KR)
Title: Temperature compensation rectifier device
Inventor: JUN SI BEOM
IPC: H02M7/217
Filed: 2001-03-06
Abstract: PURPOSE: A temperature compensating rectification apparatus is provided to improve the stability of temperature by constructing a circuit with an FET(Field Effect Transistor). CONSTITUTION: A first FET(M1) turns-on when a first operating voltage is inputted into a gate thereof. A second FET(M2) turns-on when a second operating voltage is inputted into a gate thereof. A current mirror unit(210) generates and outputs a first current with the temperature dependence to a drain of the first FET(M1) when a constant voltage is inputted and the first FET(M1) turns-on. The current mirror unit(210) also generates and outputs a second current with the temperature dependence to a drain of the second FET(M2) when the second FET(M2) turns-on. The current mirror unit(210) further generates and outputs a third current with the temperature dependence due to the first and second currents. A linear resistance circuit(220) receives the third current and removes the temperature dependence included in the third current to output a voltage.
Patent KR-20010067694-A (KR)
Inventor: SUL YUNG SEOK
Filed: 2001-03-08
Abstract: PURPOSE: A winning probability measurement system and method is provided to extract the winning probability of each horse or cycle in the horse race or the cycling race on a basis of past record data and variations of a current dividend size. CONSTITUTION: The method comprises steps of reading variation of a dividend size from a specific time, before starting the race, to a race finishing time(110), comparing the dividend size variation before the race starting with the winning probability according to the dividend size variation in the past(120), extracting the current winning probability of each horse or cycle based on the comparison result(130), mixing the extracted winning probability with the past record data(140), extracting a final optimal winning probability by mixing the mixed probability resulted from the step(140) with subjective analysis data of a specializer(150), and transmitting the final winning probability to members before the race starting(160).
Patent KR-20010044615-A (KR)
Inventor: HONG JONG DOO
IPC: B01D53/86
Filed: 2001-03-12
Abstract: PURPOSE: Disclosed are a removing method of nitric oxides (NO and NO2) using oxidation catalyst and an equipment thereof. The removing system is composed of a catalytic reactor, a semi-dry scrubber for reduction or neutralization of acidic gas, a filtering system, a blower, and a chimney. NO from the flue gas is oxidized to NO2 over the catalyst to be removed using a reductant. CONSTITUTION: The catalytic reactor (100) is linked continuously with the semi-dry scrubber (110), the filtering system (130), a blower (140), and a chimney (150) and these respective equipment are linked by duct (92). The reactor (100) contains a burner (90) as a subsidiary equipment to maintain reaction temperature at 150-700 deg.C and an oxidation catalyst to oxidize NO to NO2. Na2S or strong reductant is used as the reductant and NaOH or Ca(OH)2 as counteragent. These agents are simultaneously injected at the scrubber (110) to reduce NO2 to N2. An electric precipitator or a bagfilter are used as the filtering system (130) to filter nitrogen or chlorine from the scrubber (110). The blower (140) plays a role as a driving force to exhaust the filtered gas into the chimney (150).
Patent KR-20010094979-A (KR)
Title: MnZn ferrite production process, MnZn ferrite, and ferrite core for power supplies
Inventor: TAKAGAWA KENYA
IPC: C01G49/00
Filed: 2001-03-16
Abstract: PURPOSE: A Mn-Zn ferrite production process, Mn-Zn ferrite, and ferrite core for power supplies are provided to achieve a process for the production of a ferrite with reduced magnetic losses and power losses, a ferrite obtained by this production process, and a core for power supplies using this ferrite. CONSTITUTION: An Mn-Zn ferrite production process comprises a maximum temperature holding step for firing and a cooling step in a nitrogen atmosphere. A nitrogen atmosphere changeover temperature T in the cooling step is below 1,1500 deg. C. and equal to or higher than 1,000 deg. C., and a cooling rate V1 conforms to a condition defined by the following formula : T<=(V1+1,450)/1.5 : where T is the nitrogen atmosphere changeover temperature in deg. C. and V1 is the cooling rate in deg. C./hour from T down to 900 deg. C.
Patent KR-20020078384-A (KR)
Title: Method for Fax module diagnostic in a WLL terminal
Inventor: SONG GEUN SEONG
IPC: H04B17/00
Filed: 2001-04-09
Abstract: PURPOSE: A method for diagnosing a facsimile module in a WLL(Wireless Local Loop) terminal is provided to confirm the state of the facsimile module in a state in which the facsimile module is installed using a self diagnosis function. CONSTITUTION: If a current is a test mode(S201), the test mode is displayed on a screen(S202). A function key is input from an operator(S203), the input key is a facsimile software download diagnosis function key(S204). If the input key is not the facsimile software download diagnosis function key, it is confirmed whether the input key is a local facsimile transmission path diagnosis function key(S212). If the input key is the local facsimile transmission path diagnosis function key, a 1100Hz tone is generated(S213). It is checked whether an ESC(Escape) key is inputted(S214). If the ESC key is inputted, it is judged that a local facsimile transmission path is normal. If the input key is a local facsimile reception path diagnosis function key(S215), it is checked whether the 1100Hz tone is input(S216). If the 1100Hz tone is input, it is judged that a reception path is normal and the 1100Hz tone is displayed on the screen(S217). If the 1100Hz tone is not detected, it is checked whether the ESC key is input(S218). If the ESC key is input, it is judged that the reception path is abnormal and a message that the tone is not detected is displayed on the screen(S219).
Patent KR-20020080123-A (KR)
Title: Wireless intercom device and method for controlling the same
Inventor: KIM JONG HWA
IPC: H04M9/00
Filed: 2001-04-11
Abstract: PURPOSE: A wireless intercom device and a control method therefor are provided to offer clean speech quality and a stable wireless communication signal in an adjacent area without contact by improving a mutual call method. CONSTITUTION: A main wireless intercom device(100) controls a plurality of sub wireless intercom devices(200), and performs a broadcasting, an emergent call, and a general call with a plurality of sub wireless intercom devices(200) by wireless. A plurality of sub wireless intercom devices(200) connect to the main wireless intercom device(100) by wireless, and transmit and receive data and voices by wireless.
Patent KR-20020078980-A (KR)
Title: Optical Communication Apparatus
Inventor: BYUN JAE OH
IPC: H04B10/25
Filed: 2001-04-12
Abstract: PURPOSE: An optical communication device is provided to transmit and receive information in a same wavelength band using one optical fiber. CONSTITUTION: An optical transmitter(110) transmits the first signal. An optical isolator(210) optically connects to the optical transmitter(110), passes the first signal transmitted from the optical transmitter(110), and cuts off a signal oppositely transmitted with the first signal. An optical coupler(300) connects to the optical isolator(210). The optical coupler(300) has an input port(A) for receiving the first signal which is through the optical isolator(210), an input and output port(B) for outputting the first signal inputted to the input port(A) to the outside and receiving the second signal transmitted from the outside, and an output port(C) for outputting the second signal inputted to the input and output port(B). An optical receiver(120) receives the second signal outputted from the output port(C) of the optical coupler(300). One optical fiber(400) connects to the input and output port(B) for transmitting the first and second signals which are through the input and output port(B) of the optical coupler(300).
Patent KR-20020081510-A (KR)
Inventor: KIM GWANG SU
IPC: A47L9/28
Filed: 2001-04-18
Abstract: PURPOSE: A robot cleaning system is provided to finely perform a cleaning work by allowing a user to control a cleaning robot depending on a working condition while viewing a working place through a monitor. CONSTITUTION: A robot cleaning system includes a cleaning robot(100), a data transmitting/receiving device(300), and a station(200). The cleaning robot(100) has a camera for generating video data. The cleaning robot(100) transmits the first RF signal to the data transmitting/receiving device(300). In addition, the cleaning robot(100) receives the second RF signal including control data from the data transmitting/receiving device(300). The data transmitting/receiving device(300) receives the first RF signal from the cleaning robot(100) and transmits the first RF signal to the station(200). The station(200) displays image data transferred from the data transmitting/receiving device(300).
Patent KR-20020082002-A (KR)
Inventor: KIM JUNG GON
IPC: B26D3/00
Filed: 2001-04-23
Abstract: PURPOSE: A portable cutting guide bar is provided to improve an endurance and to expand life span of the portable cutting guide bar by allowing a position adjusting member to be fixed to or moved from a predetermined position of a connection member. CONSTITUTION: A portable cutting guide bar includes a connection member installed in a working table, a position adjusting member coupled to a guide slot of the connection member, and a guide member moving together with the position adjusting member. The position adjusting member includes a supporting body(110), a locking member(115) inserted into the guide slot(113) of the connection member(111), and an adjusting screw(117) for fixing the position adjusting member to be fixed to or separated from the connection member(111). A perforation hole(119) is formed at a center of the supporting body(110). A spring(123) is provided between a cylindrical protrusion(121) and the perforation hole(119).
Patent KR-20020085218-A (KR)
Title: A Fastening Tool of Automobile Door Trim
Inventor: KIM HAN GYEONG
IPC: B60J5/04
Filed: 2001-05-07
Abstract: PURPOSE: A fixing apparatus of a door trim for a vehicle is provided to fasten the door trim in a door inner panel conveniently by preventing the door trim from being lifted with adjusting the assembling tolerance. CONSTITUTION: A door trim fixing device of a vehicle is composed of an internal assembling member(10) having a fitting hole(11) formed longitudinally, and a stopper(12) formed in the inner periphery of the fitting hole to install in a door inner panel(5); and an external assembling member(20) having a protruded part(21) including a fitting sill(21a) assembled with the stopper by inserting to the fitting hole, and a head part(22) installed in a door trim(2). The door trim is fixed in the door inner panel with the external assembling member installed in the door trim and the internal assembling member installed in the door inner panel. The door trim is prevented from being lifted from the door inner panel by contacting the door trim to the door inner panel according to assembling tolerance.
Patent KR-20010104244-A (KR)
IPC: G08C19/00
Filed: 2001-05-10
Abstract: 휴대형 활동 기록계(10)는 사용자의 일상 생활에 필요한 에너지량, 및 휴대형 활동 기록계에 포함되는 보수계에 의해서 측정된 측정 데이터 및 입력부(12)를 조작하여 입력된 사용자의 개인 기초 데이터를 기초로 하여 생활 활동을 위한 신진대사를 위해 사용자에 의해서 소비되는 총 에너지량을 판정한다. 휴대형 활동 기록계(10)에 의해서 제공되는 데이터는 표시부(16) 상에 표시된다. 휴대형 활동 길록계(10)는 운동 기구(20, 30, 및 40)에 의해서 측정된 측정 데이터를 운동 기구로부터 수신한다. 사용자에 의해서 소비되는 에너지에 대한 종합적인 평가는 사용자의 일상 기초 신진대사에 필요한 에너지,  생활 활동을 위한 신진대사로 사용자에 의해서 소비되는 에너지, 및 운동 기구(20, 30 및 40)를 사용한 운동에 의해서 소비되는 에너지를 기초로 하여 이루어진다. 사용자의 건강 관리 상태에 관한 정보에 따른 종합적인 평가 결과가 표시부(16) 상에 표시된다.
Patent KR-20020090583-A (KR)
Title: Surface treatment method of polymer resin-based molded products by using low temperature and atmospheric pressure plasma
Inventor: CHANG SEONG GEUN
IPC: C08J7/18
Filed: 2001-05-28
Abstract: PURPOSE: A method for treating the surface of a polymer resin-based molded product using the low temperature atmospheric pressure plasma and a polymer resin-based molded product prepared by the method are provided to give the conductivity, the antistatic property, the electromagnetic wave blocking property, the gas and organic material screening property, the antibacterial effect, the hydrophilicity and the wearing resistance to the product. CONSTITUTION: The method comprises the step of treating the surface of a polymer resin by using a low temperature atmospheric pressure plasma apparatus equipped with a continuous moving means. The polymer resin is selected from the group consisting of a common plastic, an engineering plastic, a rubber-based resin, and a thermosetting plastic; and preferably the polymer comprises further a filler, and/or an additive.
Patent KR-20020092030-A (KR)
Inventor: JUNG WON IL
IPC: H01M4/04
Filed: 2001-06-01
Abstract: PURPOSE: A positive electrode active material for a lithium secondary battery and its preparation method are provided, which active material the excellent heat stability and energy density capable of replacing a cobalt-based compound and which method needs no post-treatment. CONSTITUTION: The positive electrode active material is represented by Li(1+a)Ni(1-(x+y))MnxMyO2, wherein M is at least one metal selected from the group consisting of Co, Al, Mg and La; -0.05<=a<=0.01; 0.60<=1-(x+y)<=0.73; 0.18<=x<=0.28; and 0<y <=0.12. Preferably the active material has an average particle size of 1-40 micrometers and a tap density of 1.7-2.5 g/cm3 and is in the shape of spherical or semi-spherical. The method comprises the steps of coprecipitating a nickel salt solution, a manganese salt solution and a metal salt in the presence of a complexing agent and a precipitating agent to prepare a nickel-manganese hydroxide; mixing the nickel-manganese hydroxide with lithium salt; and sintering the mixture. Preferably the coprecipitation is carried out at pH 11-12; and the sintering is carried out at 400-500 deg.C and at 650-900 deg.C twice.
Patent KR-20010079124-A (KR)
Inventor: LEE JONG MAN
IPC: F03B17/00
Filed: 2001-06-15
Abstract: PURPOSE: A water pump is provided to supply power by installing a pump in an outer wall of a high building simply, and to resolve drought by mounting a channel in a cultivated land to pump up the hill sections. CONSTITUTION: A pump is installed in the hilly section without additional supporting rods to obtain high efficiency energy. A fan is rotated with driving a motor, and the vacuum is formed with opening a counterflow preventive valve. The stream is moved up continuously against the high hydraulic pressure. Water from an upper water tank installed in the top of a mountain flows to a water turbine mounted in the opposite direction to generate high capacity electricity by rotating the turbine. The motor is driven with supplying remaining power continuously. The self-energy is supplied to a building without receiving power from the outside by simply installing the water pump in the outer wall of the building having more than 20 floors.