baber/WOPTO huggingface dataset:
Patent KR-20000028549-A (KR)
Inventor: YOON SANG GYEONG
IPC: H01L41/318
Filed: 1999-02-08
Abstract: PURPOSE: A method for forming a piezoelectric/electrostrictive film is to decrease forming temperature by applying a reactive ultra-fine ceramic oxide powder produced by single process using citric acid as a combustion agent. CONSTITUTION: A method for forming a piezoelectric/electrostrictive film comprises the steps of: preparing a solution or dispersion mixture including ceramic composition material by dissolving or dispersing the ceramic composition material in solvent or dispersion medium; obtaining mixing solution by adding citric acid to the dispersion mixture; obtaining ultra-fine ceramic oxide powder by heating the mixture solution in 100 to 500°C so as to react nonexplosive oxidation-reduction combustion reaction, the powder having uniform grain size below 1 micrometer; producing ceramic sol-solution by dissolving the ultra-fine ceramic oxide powder and the like ceramic composition material in the base of water or organic solvent; producing ceramic paste by mixing the ultra-fine ceramic oxide powder with the ceramic sol-solution; forming the piezoelectric/electrostrictive film by applying the ceramic paste to substrate; and heating the film in range of 100 to 600°C.
Patent KR-20000055805-A (KR)
Inventor: LEE JEONG YEOL
IPC: A23B7/10
Filed: 1999-02-10
Abstract: PURPOSE: A kimchi refrigerator cutting off leaking of the cold air is provided which has the function of preventing the leakage of the cold air when the door is opened. CONSTITUTION: A kimchi refrigerator cutting off leaking of the cold air is characterized by being comprised of: a chamber(20) inside of the refrigerator; a storing room(22) for kimchi inside of the chamber(20); a door(24) connected to the storing room(22); and a barrier(40) for cutting off the leakage of the cold air between the storing room(22) and a wall(21a, 21b) of the chamber(20).
Patent KR-20000056551-A (KR)
Inventor: KWON HYEOK SANG
IPC: C22C38/18
Filed: 1999-02-23
Abstract: PURPOSE: A ferrite stainless steel is provided to achieve a high resistance against pitting corrosion and stress corrosion, and superior embrittlement resistance. CONSTITUTION: A ferrite stainless steel is composed of Fe as a main component, 25.0 to 30 weight% Cr, 2.0 to 6.0 weight% W, 0.10 to 0.30 weight% Nb, 0 to 2.0 weight% Mo, 0.5 weight% or less Si, 0.5 weight% or less Mn, 0.02 weight% or less P, 0.01 weight% or less S, o.o1 weight% or less C, 0.02 weight% or less N, and 0.025 weight% C+N. As compared with a conventional stainless steel, Mo content is reduced while W is added in order to improve embrittlement resistance.
Patent KR-20000005615-A (KR)
Title: Ratchet wrench
Inventor: NEZIGANE FUMIYOSHI
IPC: B25B19/00
Filed: 1999-03-17
Abstract: PURPOSE: A ratchet wrench is provided to combine firmly a bolt and a nut buried in an area too cramped to manipulate or out of reach. CONSTITUTION: A ratchet wrench device comprises:a ratchet wrench rotatably attached to a front end unit(1a) of a manipulating rod(1) through a shaft(5); and a handle(2) installed in the other end unit(1b) of the manipulating rod. The ratchet wrench rotating around the shaft contains:a rear end unit(3b) installed in the shaft; and a front end unit(3a) containing a ratchet(7).
Patent KR-19990064497-A (KR)
Title: 소독용 약제 살포장치
Filed: 1999-03-20
Abstract: 본 발명은 소독용 분사 장치에 관한 것으로 과수원의 과일 나무 소독시 과일 잎의 전, 후면을 소독할 수 있도록 구성된 분사 장치에 관한 것이다. 
     소독약이 분사되는 노즐에 고압의 공기를 주입시켜 노즐의 지지호스와 노즐이 요동하면서 분사각을 전 방위로 분사케 하여 소독하도록 하고 노즐에서 분사되는 분무가 미세하게 이루어지게 하여 소독되지 않은 부분을 완전하게 소독할 수 있도록 그 분무의 농도를 크게 하여 잎 전체가 분무의 영향에 있게 하므로서 잎의 소독을 완성시키도록 하는 것이다.
Patent KR-19990046134-A (KR)
Title: 양봉용소초의제조방법
IPC: A01K47/04
Filed: 1999-03-27
Abstract: 본 발명은 꿀벌집의 기초가 되는 소초를 합성수지재로서 꿀벌의 습성과 본능을 감안하여 벌의 기호성을 좋게 하고 반영구적으로 사용할 수 있는 구조로 사출 성형하는 양봉용 소초의 제조방법에 관한 것이다. 
     이를 위하여 본 발명은 합성수지재 소초를 성형함에 있어서, 소초를 구성하는 단위육각형을 단위육각기둥으로 사출 성형하여 다수개의 단위육각기둥을 소초의 크기에 따라 일정크기의 단위육각기둥집합체로 구성하고 단위육각기둥집합체의 저면에 일정두께로 피착한 도금층의 형판이나 주물금형에 의해 상하 금형을 형성하여 소초를 사출 성형하는 데 그 특징이 있다.
Patent KR-20000006611-A (KR)
Inventor: KIM HANG SUK
IPC: A01G9/02
Filed: 1999-04-22
Abstract: PURPOSE: A plant growing device using a light emitting diode is provided to control the growing of plants by irradiating light of optimum wave band and brightness according to the parameter to be controlled and according to the properties of the plants. CONSTITUTION: The device is composed of:a controller(110) to perform input, output, operation and brightness control; an input and display part(129) consists of switches(122, 123, 124, 125) and a liquid crystal display panel(121) to input the light irradiation time and brightness and to display; a control part(100); light emitting diode modules(210, 220, 230) having light emitting diodes arranged in serial; tracks(240, 250) including connection parts(241, 251) having light emitting diode modules; and a light irradiating part(200) consists of a connector(135) to be connected with the control part(100),; Herein, the control of the wave length of the irradiated light, brightness and irradiating time is easy, the close irradiation of the plants is possible, and the light using efficiency is promoted.
Patent KR-19990064795-A (KR)
Title: 잔디 보호대
IPC: A01G9/28
Filed: 1999-05-10
Abstract: 본 발명은 축구경기장이나 골프장과 같이 잔디가 깔린 스포츠 경기장이 본래의 용도가 아닌 다른 목적으로 사용될 때 잔디를 덮어 보호할 수 있는, 따라서, 잔디가 깔린 스포츠 경기장을 잔디에 해를 주지 않고 다른 용도(예컨대 야외 음악회 등)로 활용할 수 있게 하는 잔디 보호대에 관한 것이다. 
     본 발명에 따른 잔디 보호대는, 광투과성 소재의 바닥판부와, 상기 바닥판부의 저면으로부터 아래로 돌출되어 잔디가 식재된 지표면에 박혀져 상기 바닥판부를 잔디위에 떠받혀 지지하는 복수 개의 침봉부를 포함하여 이루어진 바닥판과; 상기 바닥판부 상면 전체를 소정의 간극을 두고 덮는 광투과성 재질의 덮개판을 포함하여 이루어지는 것을 특징으로 하며, 이와 같은 잔디 보호대를 사용하면, 스포츠 경기장 등에 조성된 잔디를 양호한 상태로 보다 효율적으로 관리할 수 있어 언제나 양질의 잔디를 이용자에게 제공할 수 있으며, 또 그 시설들을 잔디에 전혀 해를 끼치지 않으면서 계절에 관계없이 그 본래 용도 외의 잔디를 사용치 않는 다른 용도(예컨대 음악회 등)로 사용횟수에 제한받지 않고 사용할 수 있다.
Patent KR-19990088172-A (KR)
Title: 사다리형압전필터
IPC: H03H9/58
Filed: 1999-05-11
Abstract: 본 발명의 사다리형 압전필터는 세로(longitudinal) 진동모드로 진동하기에 적합하고 실질적으로 직사각형 압전 공진자를 가지고 있는 직렬 공진자; 및 정방형 (square) 진동모드로 진동하기에 적합하고 실질적으로 정방형 압전 공진자를 가지고 있는 병렬 공진자를 포함하고 있다. 직렬 공진자와 병렬 공진자는 사다리형 회로를 형성하도록 단자들에 의해 서로 접속되어 있다. 각 직렬 공진자의 한쪽 주면에는 직렬 공진자의 세로 방향에 실질적으로 직교하는 중앙선에 대한 대칭 위치에 한쌍의 홈이, 직렬 공진자의 중앙선에 실질적으로 평행한 방향으로 연장하여 직렬 공진자의 한쪽 주면 상의 전극을 분리하도록 각각 형성되어 있어서, 직렬 공진자의 한쌍의 주면에 각각 배치된 한쌍의 전극간의 전기 정전용량이 조정된다.
Patent KR-19990068395-A (KR)
Title: 온도보상용무선비디오송신기
IPC: H04N7/18
Filed: 1999-05-14
Abstract: 개시된 온도 보상용 무선 비디오 송신기는 온도 보상형 높은 온도 특성을 갖는 크리스탈 발진기(TCXO)를 이용하여 주변의 온도차가 심한 지역을 촬영하고, 촬영한 영상신호를 외부로 송출하는 것에 관한 것이다. 
     상술한 온도 보상용 무선 비디오 송신기의 신호증폭부는 오디오신호 및 비디오신호를 입력받아 변조시키고, 발진회로부는 이렇게 변조된 오디오신호 및 비디오신호를 입력받아 주파수 변조를 행한다. 그리고, 발진신호 증폭부는 발생된 발진신호를 증폭시켜 밴드패스 필터를 거쳐 안테나로 외부로 송출하고, PLL 회로부는 주변의 온도차가 심한 지역에서도 오차폭이 작은 온도 보상형 크리스탈 발진기(TCXO)를 사용기준 주파수로 사용하는 기준주파수 발진회로부와 사용자의 조작에 따라 채널 주파수를 결정하는 제어부에 의해 상술한 발진 회로부가 항상 일정한 주파수를 유지하고 발진신호를 발생시킬 수 있도록 한다. 
     따라서, 본 발명은 주변의 온도의 변화폭이 심한 지역, 즉 철을 녹이는 용광로나, 또는 사계절 높은 산의 정상 등과 같은 온도차가 심한 지역을 감시하기 위해 설치된 카메라로부터  촬영된 신호를 정확하게 주파수 변조시켜 전송할 수 있어 원거리에서 모니터링하는 감시시스템의 화질이 깨끗하고 선명하므로 감시 효과가 높아진다.
Patent KR-20000074224-A (KR)
Inventor: NA HUI GYEONG
IPC: B60W10/04
Filed: 1999-05-19
Abstract: PURPOSE: Communication between a half-automatic transmission ECU and an engine ECU(electronic control unit) in a vehicle is provided to reduce the impact of speed changing and abrasion of a clutch. CONSTITUTION: A clutch starts to be combined by changing a position of a gear and shifting a half-automatic transmission. A change of opening degree of a throttle is sensed in an ECU of the half-automatic transmission before speed changing is completed. A reducing amount of a torque is decided based on the change amount of the opening degree of the throttle. The reducing amount of the torque is transferred to an engine ECU with a torque reduction demand signal. With the rapid change amount of the opening degree of the throttle, fuel spray is stopped and the torque is reduced by the transferred reducing amount. With the slow change amount, the engine ECU delays an ignition time and reduces the torque by the transferred reducing amount. Then the speed changing of the half-automatic transmission is completed through the perfect combination of the clutch.
Patent KR-20000074918-A (KR)
Inventor: HYUN MYEONG SU
IPC: H04L12/24
Filed: 1999-05-27
Abstract: PURPOSE: An apparatus and method are provided for upgrading a boot-ROM code of a mobile communication system by a boot-ROM management processor based on an upgrade instruction of a base station manager by providing a programmable boot-ROM to a base station. CONSTITUTION: A base station manager(110) and a base station(120) are connected through wired line. The base station manager(120) may become a base station transmission system or a base station controller. A programmable boot-ROM(130) is installed in a corresponding processor board(not shown) of the base station(120). The boot-ROM(130) has a non-volatile characteristic and a read and write function. The boot-ROM(130) includes a start loader(not shown) having an information of the board. Therefore, when a power is inputted into the base station(120), the initial loader receives a system loader from the base station manager(110) in accordance with a control of the controller(140) of a corresponding loader.
Patent KR-20000005751-A (KR)
Inventor: KAWATAYOWUIZI
IPC: H01L21/56
Filed: 1999-05-31
Abstract: PURPOSE: Semiconductor device is provided to improve a yield, a productivity, and a reliability. CONSTITUTION: In the semiconductor device to seal up two semiconductor chips with a grease sealing material using two lead frames, wide width portion is extended to width direction of dambar, one side width of the dambar is narrow than the other side width of the dambar, and the two lead frames are joined. As a result, crack of semiconductor is prevented.
Patent KR-20010003279-A (KR)
Inventor: CHOI JEONG CHEOL
IPC: B60T7/04
Filed: 1999-06-22
Abstract: PURPOSE: A connection structure between a brake pedal and a brake booster is provided to improve the brake operation feeling and braking force, by prevent a push rod from being inclined when a pedal is pushed. CONSTITUTION: A connection structure between a brake pedal and a brake booster contains the characteristics: for a brake device whose a pedal and a push rod of a brake booster are combined by a clevis, catching projections(110a,110b) are formed each in the both ends of the pedal, a slot(120a) is formed on the clevis(120), the end of the pedal is inserted into the slot of the clevis, hooked by the catching projection, and slides over the slot, so that the force is transmitted by only a contact without fixing between the pedal and the clevis and the inclination of a push rod(130) is prevented.
Patent KR-20010003873-A (KR)
Inventor: KIM GEON OK
IPC: G02F1/133
Filed: 1999-06-25
Abstract: PURPOSE: A remaining charge discharge device is provided to improve a write speed by inputting data after previously discharging a remaining charge by a parasitic capacitance at a data input electrode. CONSTITUTION: The remaining charge discharge device comprises a vertical shift register(12) which sequentially inputs a driving signal to a driving electrode of each cell formed on a backlight unit(10). A horizontal shift register(13) sequentially input a data signal to a data input electrode of the cell. A data generator(14) supplies a data value to a data input electrode of the cell. A data selection switch(15) selects an input electrode of data to be written from the data generator to the cell. A discharge switch(16) discharges a remaining charge at the data input electrode during a period of time when a horizontal selection signal is not selected. A signal generation controller(17) control a driving signal to be applied to the discharge switch(16).
Patent KR-20010003965-A (KR)
Inventor: PARK PYEONG GI
IPC: F25D29/00
Filed: 1999-06-26
Abstract: PURPOSE: A refrigerator and a method of controlling operation of refrigerator is provided to achieve user convenience by allowing cooking information to be displayed through a display device. CONSTITUTION: A refrigerator with a cabinet forming one or more cooling chambers, and a door installed to the cabinet, comprises a display unit(11) installed at a front surface of the door, a selection unit(13) for operating the display unit, a memory(15) for storing food and cooking information, and a display control unit(12) for displaying on the display unit a food list stored in the memory, drawing from the memory the detailed information for the food selected by the selection unit, and displaying the detailed information onto the display unit. A method comprises the steps of preparing a display unit on the front surface of the door, pre-storing food and cooking information into a predetermined memory, displaying on the display unit the list of the food stored in the memory, and displaying the detailed information for the selected food on the display unit.
Patent KR-20010005023-A (KR)
Inventor: CHO GYEONG MI
IPC: H04N9/00
Filed: 1999-06-30
Abstract: PURPOSE: A display system for automatically controlling screen colors according to a user's physiological state is provided for the user's health and convenience. CONSTITUTION: The display system for automatically controlling screen colors consists of a display device(3), a remote controller(5) and a color controller(2). Here, the display device(3) includes a display panel(31) and a display driving unit(32), and the remote controller(5) includes a physiological controller(1). A discoloration material changed according to an amount of current is coated on the surface of a screen(311) of the display panel(31). The display driving unit(32) controls an amount of current flowing through the discoloration material according to an inputted color control signal, and simultaneously drives the display panel(31) by processing an externally-inputted image signal. The physiological controller(1) generates a physiological control signal according to a physiological state of the user. The color controller(2) processes the physiological control signal from the physiological controller(1), and generates a color control signal.
Patent KR-19990073350-A (KR)
Title: 축산폐수고도처리장치및그방법
IPC: C02F11/00
Filed: 1999-07-05
Abstract: 본 발명은 축산폐수 고도처리 장치 및 그 방법에 관한 것이다. 
     본 발명의 제1특징은 유입된 원수를 1차적으로 분과 뇨를 분리시켜 주는 전처리조(1)와; 상기 전처리조 측방에 구성되고 고형물 농축저류조로 오니를 이송시키는 오니이송펌프와 오니이송관을 갖는 침전분리조(11)와; 상기 침전분리조 측방에 구성되고 흡인여과 또는 에어리프트여과를 하는 고액분리조(16)와; 상기 고액분리조의 측방에 구성되고 혐기조건을 형성하는 제1 폭기조(34)와; 상기 제1폭기조의 측방에 구성되고 유기물질의 생물학적 분해와 탄소산화가 이루어지며 질산화와 인의 축적이 진행되고 활성오니와 처리수를 분리처리 하는 막분리폭기조(36)로 구성된 것이다. 
     제2특징은 유입된 원수를 1차적으로 분과 뇨를 분리시켜 주고 1차 전처리수는 침전분리공정으로 이송시키는 전처리공정과; 상기 전처리공정을 거친 전처리수를 2차적으로 침전분리하고 중등액만을 고액분리공정으로 이류시키며, 막분리폭기공정에서 발생되어 이송된 잉여오니를 침전한 후 침전된 오니는 최종적으로 고형물 농축저류조로 이송시키는 침전분리공정과; 상기 침전분리공정에서 2차적으로 침전분리된 처리수를 저부에서 침전분리가 재차 이루어짐과 동시에 상등액은 2차적인 고액분리가 이루어지는 고액분리공정과; 간헐폭기공정으로서 혐기조건을 형성해 주어 탈질반응이 이루어짐과 동시에 용존 유기물질의 축적과 인의 방출을 발생시키는 제1 폭기공정과; 연속폭기공정으로서 유기물질의 생물학적 분해와 탄소산화가 이루어지며 질산화와 인의 축적이 진행되고 잉여오니는 침전분리 공정으로 이송하고 반송오니는 제1폭기 공정으로 이송하며 활성오니와 처리수를 분리하여 처리하는 막분리폭기공정으로 이루어지는 축산폐수 고도처리 방법이다. 
     본 발명은 위와 같은 축산폐수 처리 시스템에 의하여 고형물 성분을 제거함으로써 막오염을 감소시키고, 제1폭기조와 막분리폭기조내의 활성슬러지에 의한 생물학적 분해처리의 부하를 저감시켜 고도의 안정적인 수질을 확보할 수 있는 효과가 있다.
Patent KR-20010016982-A (KR)
Inventor: JUNG JAE YEONG
IPC: G02F1/1335
Filed: 1999-08-06
Abstract: PURPOSE: A transflective liquid crystal display has both reflective mode and transmissive mode by using a via hole inside a reflective electrode, thereby make it possible to be used regardless of day/night. CONSTITUTION: A via hole(72) inside a reflective electrode(68) transmits a backlight unit(112) emitted from a backlight(102). In reflective mode, a reflective electrode(68) re-reflects an external light(110) incident through an upper panel(106) towards the upper panel(106). When a switching element applies a signal to the reflective electrode(68), the phase of a liquid crystal layer is changed. Then, a color filter(104) changes colors according to the change of a quantity of re-reflected light(110) and the signal applied to the reflective electrode(68) is displayed as picture on a screen. In transmissive mode, a light emitted from the backlight(102) transmits a pixel electrode(70) located in the via hole(72). When the switching element applies the signal to the pixel electrode(70), the phase of the liquid crystal layer is changed. Then, the color filter(104) changes colors according to the change of a quantity of transmitting light(112) and the signal applied to the pixel electrode(70) is displayed as picture on a screen.
Patent KR-19990078949-A (KR)
IPC: H04R9/02
Filed: 1999-08-23
Abstract: 본 발명은 초소형으로 하이 파워, 고효율의 음향변환 및 3-모드 광대역의 주파수 재생 특성을 갖는 전기-음향 변환기에 관한 것이다. 
     본 발명은 내부에 요홈이 형성되고, 적어도 일측면에 일정한 수직벽을 제거하기 위한 수직 절개부를 갖는 요크와, 요크의 요홈에 설치되어 비교번 자계를 발생하는 영구자석과, 외주부와 요크의 상단부 사이에 자기갭을 형성하기 위한 플레이트와, 구동신호가 인가될 때 교번 자계를 발생하며 자기갭에 배치되어 비교번 자계와의 상호작용에 따라 상하로 변위되도록 보빈에 권취된 코일과, 요크를 둘러싸며 내부에 요홈을 형성하도록 외주부가 직각으로 연장 형성되며 요크의 절개부에 대응하는 요홈 공간부에 외부와 연통하는 관통구멍이 형성된 프레임과, 외주부가 프레임의 상단에 지지되어 보빈이 상하로 변위될 때 구동신호에 대응한 음향이 발생되는 진동판으로 구성되며, 요크의 절개부와 프레임에 형성되는 공간은 코일과 도입선의 연결부가 상하 진동시에 접촉을 방지할 수 있는 크기로 형성되어, 보빈의 상하 진동폭이 확장되는 것을 특징으로 한다.
Patent KR-20010019350-A (KR)
Inventor: YOON YEONG HWAN
IPC: H01L27/04
Filed: 1999-08-26
Abstract: PURPOSE: A circuit for reducing electron magnetic interference(EMI) of a semiconductor device is provided to reduce the EMI of a semiconductor chip by a spectrum spread effect, by outputting an output signal of which a pulse width is varied. CONSTITUTION: A division circuit(10) outputs a division signal which is obtained by dividing the first input signal applied from the exterior by a predetermined division rate. A level shifter(20) shifts a voltage level of the division signal from the division circuit. The first filter(30) filters the division signal from the level shifter. The second filter(40) filters the second input signal from the exterior. The first comparing circuit outputs the first output signal which compares the first input signal with the first division signal from the first filter. The second output driving unit outputs the second output signal which compares the first input signal with the second input signal from the second filter.
Patent KR-20000017579-A (KR)
Inventor: GARASAWASIGERU
IPC: G07B15/00
Filed: 1999-08-27
Abstract: PURPOSE: A toll collection system of cars is provided to make it possible to use a on board unit regardless of a number of tollgate antenna. CONSTITUTION: The system comprises: (a)a radio communication mean for communicating with a on board unit mounted in a car with a integrated circuit; (b)a gateway device with a notifying means transmitting a notified information about the radio communication means to the on board unit; (c)a recording mean for recording a data transmitted from the radio communication mean after communicating with the radio communication mean in the basis of the notified information.
Patent KR-19990084016-A (KR)
Title: 냉장고 커넥터의 발포액 침투방지방법 및 커넥터 고정용슬리이브
IPC: F25D23/06
Filed: 1999-09-07
Abstract: 본 발명은 커넥터 고정을 위한 발포액을 분사하기 전에 커넥터를 패널에 완벽하게 고정시키고 내부로 발포액이 스며들지 않는 냉장고 커넥터의 발포액 침투방지방법 및 커넥터 고정용 슬리이브를 제공하기 위한 것으로서, 커넥터(1)에 커넥터 고정용 슬리이브(2)를 삽입하는 단계와; 슬리이브(2)가 삽입된 커넥터를 냉장고 내부 패널(3)에 삽입하는 단계와; 커넥터(1)가 냉장고 패널(3)에 삽입된 상태에서 발포액(4)을 분사하는 단계로 이루어지고, 패널(3) 안쪽으로 강하게 압착할 수 있도록 슬리이브(2) 끝단에 형성된 외향확장부(5)와; 커넥터 날개부(6)를 고정시키기 위해 날개부에 형상에 맞게 형성된 날개 고정부(7)와; TPA(8)를 고정시키기 위해 TPA(8)와 맞닿는 면적에 맞게 형성된 걸림홈(9,9')과; 아래쪽으로 일정각도로 꺽인 전선 삽입구(11)로 구성된다.
Patent KR-20010027058-A (KR)
Inventor: YOON GYEONG CHUN
IPC: H04N3/19
Filed: 1999-09-10
Abstract: PURPOSE: A high voltage stabilization circuit of a video display is provided to supply automatically a predetermined feedback voltage to a PWM(Pulse Width Modulation) controller by indirectly sensing a high voltage. CONSTITUTION: A PWM control portion(10) outputs a PWM control signal by a feedback voltage. A DC/DC converter(20) converts an input voltage to a voltage of B+ by turning on or off a switching device according to the PWM control signal. A high voltage circuit(30) receives the voltage of B+ and converts a high alternating voltage to a high direct voltage. A direct current converter(40) converts an alternating voltage to a direct voltage. A micro computer(50) provides the first feedback voltage to the PWM controller according to the direct voltage output from the direct current converter.
Patent KR-20010028133-A (KR)
Inventor: LEE DONG MIN
IPC: H04B7/155
Filed: 1999-09-17
Abstract: PURPOSE: An apparatus for checking signal receiving paths of a base station of a mobile communication system is provided to check a state of the base station on the receiving paths in quantitative numbers, and to check the receiving paths. CONSTITUTION: A switch(21) performs switch operations between an antenna(16), the first directional coupler(11), and a receiving path check unit(30), and prevents a signal incoming to the antenna(16). The first signal distributor(22) distributes signals of a low noise amplifier(13), and transmits the distributed signals to a low frequency converter(14) and the receiving path check unit(30). The second directional coupler(23) samples outputs of the low frequency converter(14), and transmits the sampled outputs to an A/D(Analog to Digital) converter(15) and the receiving path check unit(30). The receiving path check unit(30) is connected with the switch(21), the first signal distributor(22), and the second directional coupler(23) to monitor the inputted signals, then decides whether an output on receiving paths is normally processed.
Patent KR-20000023315-A (KR)
Title: Quadrature output oscillator device
Inventor: GAPURIRANGIT
IPC: H03K3/354
Filed: 1999-09-21
Abstract: PURPOSE: A quadrature output oscillator device is provided to remove efficiently a frequency image by controlling a quadrature output without a manual filter. CONSTITUTION: A quadrature output oscillator device(22) comprises a first voltage control oscillator(40) and a second voltage control oscillator(44). The second control oscillator(44) generates a first output(C) and a second output(D) to drive a first amplifier(42). The second output of the second voltage control oscillator is a quadrature phase signal component output(Q) of the quadrature output oscillator device. The first voltage control oscillator generates a first output(A) and a second output(B) to drive a second amplifier(42). The second output of the first voltage control oscillator is a phase signal component output(I) of the quadrature output oscillator device. The first and the second amplifiers generate feedback signals. A gain control unit(48) controls the gains of the first and the second amplifiers.
Patent KR-20010038290-A (KR)
Inventor: KIM DAE UNG
IPC: H04L1/20
Filed: 1999-10-23
Abstract: PURPOSE: A method of requiring data re-transmission is provided to improve re-transmission efficiency by searching all data with transfer error caused in a window size and requiring re-transmission of the search data at once. CONSTITUTION: After receiving data protocol data unit(PDU) with an order number(401), a maximumly allowed reception state coefficient is compared with the order number of the received data PDU(402). If the order number is over the maximumly allowed reception state coefficient, the received data PDU is discarded and then the reception state coefficient value is adjusted(403). If the order number is below the maximumly allowed reception state coefficient, whether the order number is identical to the reception state coefficient is checked(404). If so, the received data PDU is transferred to an upper application(405). If not, whether the order number is more than the reception state coefficient is checked(406). If the order number is less than the reception state coefficient, the received data PDU is discarded and then the reception state coefficient value is adjusted(407). If the order number is more than a reception standby order number, the received data PDU is stored in a reception buffer(408). After searching erroneous data PDU, data PDU for requiring re-transmission is generated(409) and transmitted(410).