baber/WOPTO huggingface dataset:
Patent KR-20000046771-A (KR)
Title: Method for preparing high purity calcium hypochlorite using domestic lime
Inventor: KIM BONG NAM
IPC: C01F11/24
Filed: 1998-12-31
Abstract: PURPOSE: A method for preparing high purity calcium hypochlorite is provided to use a domestic lime mass as a reactant, to improve efficiency of the process, to suppress side reactions, to obtain sodium chloride having good quality as a by product as well as to maximize the yield of calcium hypochlorite. CONSTITUTION: A method for preparing high purity calcium hypochlorite according to the present invention comprises mixing slaked lime slurry and independently prepared sodium hypochlorite and chlorinating with chlorine to obtain calcium hypochlorite wherein the method characterized in that domestic slaked lime having low quality grade is purified by a physical method and used as a starting material, 45% aqueous solution of sodium hydroxide is used to prepare sodium hypochlorite without diluting, aging at temperature of 12-18°C, at the stirring speed of 20-200 rpm under crystal growing condition for 1-5 hours, recovering and recycling calcium hypochlorite dissolved and discharged in the reaction liquor at temperature of 38-42°C, at the stirring speed of 50-500 rpm under dibasifying condition for 0.2-2 hours and the dibasic residue generated in the said dibasifying reaction is recycled.
Patent KR-20000047179-A (KR)
Title: System for controlling traces and attitude of movable robot by using hybrid system
Inventor: SON HYO YEONG
IPC: B25J13/00
Filed: 1998-12-31
Abstract: PURPOSE: A system for controlling traces and attitude of movable robot by using hybrid system is provided, by which a movable robot starts from a desired position and attitude and reaches to a desired position and attitude within the minimum distance by means of control of traces and attitude through a hybrid control considering a restrictive condition of the kinematics of machinery in a robot. CONSTITUTION: A system for controlling traces and attitude of movable robot by using hybrid system, which is constituted to control the respective wheels of a movable robot based on a predetermined control signal, comprises a state information storing device(52) for storing a position information by which an operation state of the movable robot is changed; a dispersive operation control device(60) which calculates a state change position based on a current position information and a reaching position information input by a user and stores it to the state information storing device(52) while calculates a variable of the state in a current position based on the state information applied from a state information determining device(51); a state variable converting device(53) for converting a state variable data applied from the dispersive operation control device(60) to an analog variable; a continuous operation control device(40) which controls the wheels of the movable robot based on the analog variable applied from the state variable converting device(53) and applies a variable changing in response to a moving traces to a state information determining device(51); and a state information determining device(51) which periodically identifies the variables applied from the continuous operation control device(40) and then, if the current position is identical with a state change position stored in the state information storing device(52), applies a state change data to the dispersive operation control device(60).
Patent KR-19990035915-A (KR)
IPC: G11C16/02
Filed: 1996-07-03
Abstract: A method for verifying the status of selected nonvolatile memory cells of an integrated memory circuit, such as during a memory erase or programming operation, and an integrated nonvolatile memory circuit including circuitry for performing this verification method. Preferably, the invention employs simple logic circuitry including a flip-flop to assert successful verification data only in response to a continuous validity of a verification signal throughout a sampling period, thereby avoiding false assertion of successful verification data. The sampling period is preferably longer than the expected duration of fluctuations due to noise in the verification signal. During the sampling period of a verification operation, the logic circuitry receives a raw verification signal indicative of the instantaneous relation between a measured threshold voltage of a selected memory cell and a reference voltage. The raw verification signal is valid if the threshold voltage has a desired relation to the reference voltage at an instant of time. The flip-flop remains in a first state while the raw verification signal is valid, but enters a second state in response to the raw verification signal going invalid and remains in the second state for the rest of the sampling period. An output signal from the logic circuitry indicates the state of the flip-flop at the end of the sampling period. A level of the output signal indicating that the flip-flop is in the first state at the end of the sampling period is interpreted as successful verification data.
Patent KR-20000064349-A (KR)
Title: 고 열전도성 복합자성체
IPC: H05K7/20
Filed: 1997-09-09
Abstract: 연자성 분말을 유기결합제중에 분산시켜 이루어지며 전자간섭억제효과를 가지는 복합자성체에 있어서, 유기결합제중에 열전도성이 양호한 분말을 분산하여, 열전도성이 우수한 복합자성체를 제공한다.  상기 복합자성체는, 전자기기의 방열용 시트로서 겸용할 수 있다. 또한, 전자간섭억제효과를 갖는 히트싱크를 구성할 수도 있다.  유기결합제로는, 열가소성 폴리이미드, 액정 폴리머를 들 수 있고, 열전도성이 양호한 분말로는, 알루미나(Al 2 O 3 ), 질화 알루미늄(AlN), 입방정(立方晶) 질화 붕소(BN), 절연성 탄화규소(SiC), 열 전도성 강화재(캡톤)를 들 수 있다.
Patent KR-19990071642-A (KR)
Title: 이중 금속 시아나이드 착물 촉매를 사용하여 제조된 전이금속을저 수준으로 함유하는 폴리옥시알킬렌 폴리에테르 폴리올의 제조방법
IPC: C08G65/26
Filed: 1996-12-19
Abstract: 전이금속을 거의 함유하지 않는 폴리옥시알킬렌 폴리에테르는 프로필렌 옥사이드 중합 속도가 프로필렌 옥사이드 5g/min 이상인 이중 금속 시아나이드 착물 옥시알킬화 촉매를 15ppm 이하로 사용하여 적합한 하이드릭 옥시알킬화 개시제 분자를 이중 금속 시아나이드 착물 촉매된 옥시알킬화시킴으로써 제조할 수 있다. 이중 금속 시아나이드 착물 촉매를 사용하는 옥시알킬화와 관련된 유도 기간은 예비활성화된 마스터 배치를 제조한 다음 적어도 유도 기간 동안 옥시알킬화 반응기 온도를 향상시킴으로써 감소시킬 수 있다.
Patent KR-19990081877-A (KR)
IPC: B24B37/24
Filed: 1997-01-21
Abstract: The present invention is a polishing pad for use in chemical-mechanical planarization of semiconductor wafers, and a method for making the polishing pad. The polishing pad has a body, molecular bonding links, and abrasive particles dispersed substantially uniformly throughout the body. The body is made from a polymeric matrix material and the molecular bonding links are covalently bonded to the matrix material. Substantially all of the abrasive particles are covalently bonded to at least one molecular bonding link. The molecular bonding links securely affix the abrasive particles to the matrix material to enhance the uniformity, of the distribution of the abrasive particles throughout the pad and to substantially prevent the abrasive particles from breaking away from the pad.
Patent KR-19990082191-A (KR)
Title: 배기가스 탈황 시스템
IPC: B01D53/80
Filed: 1997-01-24
Abstract: 길이방향으로 다수개의 노즐을 가지고 있고 한쪽 끝이 막힌 분사관이, 배기가스가 수직으로 통과하는 흡착탑에 수평으로 배치되며, 흡착성 슬러리가 분사관의 다른 쪽 끝으로부터 공급되어 노즐로부터 위쪽으로 분사되며, 이에 따라 흡착탑에서 흡착성 슬러리가 배기가스와 접촉하여 처리가 이루어지며, 분사관의 막힌 한쪽 끝의 유로는 유로 단면적이 막힌 한쪽 끝을 향하여 감소되는 형상으로 이루어지는 것을 특징으로 하는 배기가스 탈황장치.
Patent KR-20000016134-A (KR)
Title: Fuel additives
Inventor: MACMILLAN JOHN ALEXANDER
IPC: E21B41/02
Filed: 1997-05-30
Abstract: PURPOSE: An additive increasing the lubricity of fuels and having corrosion resistance is provided which has improved compatibility with another fuels and additives. CONSTITUTION: Compounds of formula (I) where R1 is a C10-32 alkenyl group, R2 and R3 are (-CH2CH2)nOH, (-OCH2CHCH3-)nOH or -CH2CHOHCH2OH in which n is an integer from 1 to 10 are lubricity and corrosion prevention additives for fuels. For example 59g maleic anhydride and 190g polyisobutylene such as NAPVIS XD 35(BP Co) are reacted at 230°C for 16 hr, vacuum-distilled for 4 hr, cooled at room temperature, added with 170g toluene and 81g diethylene glycol, and heated at 140°C for 8 hr. The reaction mixture is cooled to room temperature to give viscose liquid, which is used as the additive. The experiment for the lubricity and corrosion of the additive is conducted by the High Frequency Reciprocating Ring(HFRR) bench test of the SAE technical paper 932692 and the standard test TM-01-72 of the National Association of Corrosion Engineers(NACE).
Patent KR-20000055760-A (KR)
Inventor: SHU SUNG KU
IPC: G01P3/487
Filed: 1999-02-10
Abstract: PURPOSE: An apparatus for sensing a wheel speed is provided which senses the wheel speed of a vehicle without connecting a wheel speed sensor to the ground to detect if the wheel speed sensor is normal or abnormal even when the vehicle is stopped. CONSTITUTION: In a circuit for sensing a wheel speed, voltage dividing resistors(R2,R3) are connected to one side of a wheel speed sensor(50), the voltage dividing resistor(R2) being connected to a power supply, the voltage dividing resistor(R3) being grounded. A resistor(R4) is coupled between the voltage dividing resistors and one input port(IN1) of a wheel speed calculation part(60). A grounded resistor(R5) is connected to the other side of the wheel speed sensor, and a resistor(R6) is coupled between the resistor grounded and the other input port(IN2) of the wheel speed calculation part. A condenser(C1) is connected between both input ports of the wheel speed calculation part. A condenser(C2) is coupled between a resistor(R7) and an A/D converter(80). When a wheel speed signal generated by the wheel speed sensor is inputted through the A/D converter, if the input value is sensed to be lower than a predetermined value, the wheel speed sensor(50) is judged to be short circuited to 0 ohm. The output value of the A/D converter becomes the standard of the judgement and is determined by pull-up power supply voltage, the voltage dividing resistors, the resistance of the wheel speed sensor and the grounded resistor.
Patent KR-20000056698-A (KR)
Inventor: JUNG CHUL SOO
IPC: A01G13/02
Filed: 1999-02-25
Abstract: PURPOSE: A vinyl hothouse for isolating harmful insects is for isolating insects which invade during ventilation so as to produce low polluted farm products by reducing the use of agricultural chemicals. CONSTITUTION: A vinyl hothouse for isolating harmful insects consists of the main vinyl body(50) which makes up the curtain keeping warmth, the net isolating insects(51) whose one end is sealed on the inside of the vinyl body and which passes only air, the firm pasteboard(52) which makes up the lower part of the net and is buried in ground, and the open and shut device(53) which is installed on the end of both vinyl body. During ventilation the end of the vinyl body reaches the upper part of the net isolating insects by operating the open and shut device.
Patent KR-19990046369-A (KR)
Title: 핸드카
IPC: B62B1/00
Filed: 1999-03-02
Abstract: 본 발명은 특히 손으로 용이하게 물건을 운반하기 어려운 경우 간단한 조작으로 이동할 수 있는 핸드카에 대한 것으로서, 하측가이드부재(350)는 관통구멍(305)의 내측에 삽입되어 상기 상측지지부재(150)와 가이드수단(300)이 분리되지 않도록 지지하는 지지축(304)과, 핸드카의 내측으로 뻗어 있으며 그 내부에 구멍이 형성되어 그 내측에 결착부재(320)가 삽입되는 돌출가이드부(316)로 이루어져 있으며, 상기 상측가이드부재(360)는 관통구멍(301)의 내측에 삽입되어 상기 하측지지부재(140)와 가이드수단(300)이 분리되지 않도록 지지하는 지지축(302)과, 상기 상측지지부재(150)에 형성된 관통구멍(152)에 연결되도록 관통되어 있는 관통구멍(308)과, 상기 관통구멍(152) 내측에 배설되어 상기 상측가이드부재(360)에 형성된 관통구멍(308)을 통해서 돌출됨으로써 손잡이를 지지하는 탄성지지부재(306)와, 상기 하측지지부재(140)의 상단부가 삽입되도록 형성되어 있는 구멍(312)과, 핸드카의 내측으로 뻗어있으면서 그 내부에 구멍이 형성되어 있는 돌출가이드부 (314)로 이루어져 있는 것을 특징으로 한다.
Patent KR-20000060720-A (KR)
Title: Multiplexer
Inventor: HUH SAM SIK
IPC: H03K17/735
Filed: 1999-03-18
Abstract: PURPOSE: A multiplexer is provided to be capable of preventing the increase of an unnecessary power consumption and the increase of a board area in a digital subscriber line access multiplexer system. CONSTITUTION: A multiplexer comprises first and second 2:1 multiplexers(140,150), an inverter(110), an AND gate(120) and an OR gate(130). The inverter(110) receives a select signal(S1) to invert the received select signal(S1). The AND gate(120) mixes an output signal of the inverter(110) and a select signal(S2). The OR gate(130) combines the select signals(S1,S2). The first 2:1 multiplexer(140) receives input signals(G2,G3) through input terminals(A,B), and outputs either one of the received signals according to an output control sign(GN) and an output signal of the AND gate(120). The second 2:1 multiplexer(150) receives an input signal(G1) and an output signal of the first 2:1 multiplexer(140), and outputs either one of the received signals according to the output control signal(GN) and an output signal of the OR gate(130).
Patent KR-20000061493-A (KR)
Inventor: LEE MI RAN
IPC: G09B29/10
Filed: 1999-03-26
Abstract: PURPOSE: A system for providing an address of a building is provided to accurately convert an address of a building by automatically providing an address of a building about a road by using GIS. CONSTITUTION: The addresses of buildings are provided such that the left side buildings of a road have odd numbers and the right side buildings of the road have even numbers. The addresses of the buildings are provided in ascending power. With respect to building located in a side street. Lower numbers such as 'X-n' are provided. The addresses of the buildings are automatically provided by using GIS in which space information of the road and the side street is stored. The database of the GIS comprises a space data bse comprising roads, buildings, and side street layers and applicable letter information.
Patent KR-20000061955-A (KR)
Inventor: KIM SUK CHOON
IPC: C01B3/02
Filed: 1999-03-31
Abstract: PURPOSE: An apparatus for generating hydrogen-oxygen mixed gas is provided eliminate vapor in the mixing gas generated from an apparatus for electrolysis for producing pure hydrogen-oxygen mixing gas. The mixing gas is useful for several works by adding volatile compounds having carbon to hydrogen-oxygen gas. CONSTITUTION: An apparatus for generating hydrogen-oxygen mixing gas comprises a device for electrolysis, a device for cooling gas and a device for dry to filter vapor of an electrolyte. The device for dry (800) includes several electrode plates (801) and several filters (803) arranged between the electrode plates (801) to condense water drops while passing vapor of the electrolyte. Each electrode plate (801) is equipped as a sealed state by each cover (804) corresponding to the plate (801). The cover (804) is fastened by a coated staying bolt (809) and a nut (810). An entrance (806) is located on the lower part of an end of the cover (804) to receive the mixing gas. An outlet (807) is formed on the upper part of the other end of the cover (804) from each filter (803) to the electrode plate (801) for discharging toward torch (T). A hole (805) on an end of the electrode plate (801) allows passing the mixing gas. An electrode (808) is connected for supplying 18-20V of voltage in series.
Patent KR-20000062075-A (KR)
Inventor: LEE CHANG JIN
IPC: A23L17/00
Filed: 1999-03-30
Abstract: PURPOSE: A salted fish containing charcoal is provided, which can alleviate toxicity, remove odor by anion, being emitted from the charcoal, thereby useful for maintaining homeostasis of human. CONSTITUTION: To achieve the above objects, charcoal is pulverized into fine powders. After treating the fine charcoal powders to be non-toxic to human, an effective amount of powder is added in a conventional preparing process of salted fish.
Patent KR-19990064568-A (KR)
Title: 허리벨트 결속용 버클
Filed: 1999-04-13
Abstract: 본 발명은 의복착용시 사용되는 허리벨트의 안전한 결속과 용이한 분리를 이루게 하는 허리벨트 결속용 버클에 관한 것이다. 본 허리벨트 결속용 버클은 허리벨트(10)를 수용하며 합성수지제로 성형되는 버클본체(20)와, 상기 버클본체(20)에 게재되며 허리벨트(10)를 결속하는 작동구(30)를 일체성 있게 합성수지제로 성형되는 지지부재(40)와, 상기 작동구(30)를 들어올리고 내리도록 하는 누름구(60)를 포함한다. 이에 따라 본 발명은 버클의 생산속도를 빠르게 하면서 편리하고 안전하게 허리벨트의 결속과 해제를 이루게 하여 편리성을 도모하고, 간단한 구조로 버클제작비용을 절감할 수 있다.
Patent KR-20000034839-A (KR)
Inventor: KATAYAMA KOJI
IPC: B62J11/00
Filed: 1999-04-15
Abstract: PURPOSE: A loaded machine for a two-wheeled vehicle is provided to have excellent operating performance and waterproof property and to be prevented from robbing. CONSTITUTION: A loaded machine such as an automatic pay check(9) is stored in a space(7) made into an attaching stay(1) and a cover(2). The space is a waterproof structure and a vibration resistant structure by a packing(8). A ventilating hole(16) is installed on the bottom of the attaching stay for conducting a respiratory function. A moisture filter(15) is also installed on the attaching stay for protecting the pay check from moisture or dust.
Patent KR-20000067546-A (KR)
Inventor: PARK YEON HUI
IPC: A23B7/10
Filed: 1999-04-29
Abstract: PURPOSE: Method for preventing the acidification of Kimchi by adding nisin which restrains selectively the growth of Lactobacillus genus which acidifies Kimchi is provided to prolong the storage period and improve the quality. CONSTITUTION: Method for preventing the acidification of Kimchi is characterized in that 1.25-25mg of nisin can be added, based on 1kg of Kimchi, desirably 2.5-7.5mg when the pH of Kimchi reaches 4.0-4.3 during fermentation. The added nisin prevents the growth of Lactobacillus genus, but does not prevent the growth of Leuconostoc genus, main bacillus fermenting Kimchi.
Patent KR-20000005830-A (KR)
Inventor: TAKADA SHIGEKI
IPC: C08J7/048
Filed: 1999-06-02
Abstract: PURPOSE: The coated film and laminates are prepared which has oxygen gas barrier properties. CONSTITUTION: The coating agent comprises an aqueous polyvinyl alcohol having 90- 99.99 mol % of degree of hydrolysis, containing 3- 19 mol % of alpha-olefin having less than 4 of carbon atom. The laminates comprises the aqueous polyvinyl alcohol layer, polyolefin layer, polyester layer or polyamide layer. Thus, polyvinyl alcohol is slowly added in 7 weight % of isopropyl alcohol, stirred and dispersed, followed by dissolving in polyvinyl alcohol at 95 degree C to give 20 % concentration of aqueous polyvinyl alcohol solution. The solution is coated on the surface of film having a thickness of 15 micrometer at 50 degree C to thickness of 2.0 micrometer.
Patent KR-20010002888-A (KR)
Inventor: KIM WOON YONG
IPC: H04N5/225
Filed: 1999-06-18
Abstract: PURPOSE: A method and an apparatus for controlling fan/tilt camera are provided to appear a center point of an object at a center part of a view finder screen by designating the center position of the object and changing directly a direction with the shortest distance regardless of the position of the object in the screen of the view finder. CONSTITUTION: The method and the apparatus for controlling fan/tilt camera includes following units. The apparatus includes a fan/tilt camera(180). A fan motor(161) and its driving device(160) are for rotating horizontally the camera. A tilt motor(171) and its driving device(170) are for rotating vertically the camera. Deceleration devices(162) and(172) combines the fan/tilt camera(180) to the two motors(161) and(171) mechanically, thereby capable of providing a rotation force to the fan/tilt camera by each motor, driving device and deceleration device. A timer device(110) generates interrupts at every predetermined time with a constant period for driving the fan motor or the tilt motor.
Patent KR-19990083713-A (KR)
Filed: 1999-06-17
Abstract: 본 발명은 시간을 읽게 해주는 시계의 지침과 지침판에 관한 것으로, 종래의 시계가 하나의 고정된 지침판 위에서 초침, 분침, 시침 등 세 개의 지침이 회전 하면서 시간을 읽게 하였는데, 이와 반대로 본 발명의 시계는 세 개의 지침을 한 개로 통일하여 지정된 곳에 고정해 놓고, 하나의 표면으로 고정되어 왔던 시계의 지침판을 디스켓 모양으로 된 원형의 초침판, 분침판, 시침판으로 분리 독립시킨 후 각자 시계의 반대방향 으로 회전하도록 하면서 시간을 읽게 한 것이다. 
     또한 본 발명은 여러 나라의 현재 시각을 파악할 수 있도록 여러 나라의 시각에 맞추어 지침을 추가로 삽입하여 고정시킴으로써 여러 나라의 시각을 한 눈에 읽을수 있도록 한 것이다. 
     또한 시계의 침판들이 하나의 평면으로 이루어져 있으므로 시계의 표면에 한 장의 사진이나 그림등을 표면 처리한 후 회전을 실시하여 사진이나 그림등이 일정 시간 간격으로 해체와 조화를 이룰 수 있도록 한 것이다. 
     본 발명은 이러한 목적을 달성하기 위해 구동모터의 장치(12)를 구비한 후, 고정된 한 개의 지침(5)과 몇 개의 지침을 추가로 시계의 지침판 케이스 내부 측면에 고정해 놓고, 초를 나타내는 초침판(1), 분을 나타내는 분침판(2), 시를 나타내는 시침판(3) 등 원형으로 된 세 개의 침판을 시계의 지침판에 수평으로 놓은 상태에서 회전하도록 한 것이다.
Patent KR-20010003923-A (KR)
Inventor: JUN JUN SEOP
IPC: A47J27/62
Filed: 1999-06-26
Abstract: PURPOSE: Method of setting reserve time in rice cookers is provided which includes multiple reserve setting methods and easy reserve function so that it raises frequency for reserve cooking. CONSTITUTION: The method of setting reserve time in rice cookers comprises the steps of: (i) receiving the input of a reserve button to judge whether a setting mode for reserve time is a first setting mode for reserve time or not; (ii) converting to a second setting mode for reserve time to complete cooking in time set by users, if the first setting mode for reserve time is set; and (iii) converting to the first setting mode for reserve time to complete cooking when time set by users is passed, if the first setting mode for reserve time is not set.
Patent KR-20010004632-A (KR)
Inventor: HWANG GIL NAM
IPC: H01L21/50
Filed: 1999-06-29
Abstract: PURPOSE: An unnecessary silver plating stripping method is provided to be capable of maintaining a desired degree of luster and preventing generation of smut by substitution reaction of silver ions and copper. CONSTITUTION: An unnecessary silver plating stripping method includes constituting a bath containing sliver stripping component that is formed of at least more than one species of gluconic acid, gluconic acid potassium and gluconic calcium and pH keeper that is formed of at least more than one species of 4-fold boric sodium(boric acid), 4-fold boric potassium or phthalic acid hydrogen-sodium. A copper alloy or a nickel alloy substrate is used as an anode and the mixture of the silver stripping component and the pH keeper is pH4-10 and the copper alloy or the nickel alloy substrate is deposited into it. Under the condition that the temperature of the bath is 3-60 deg.C and the current density is 0.1-50 ASD, they are stirred and electroplated.
Patent KR-20010005369-A (KR)
Inventor: HAN HUI SIK
IPC: B65D30/00
Filed: 1999-06-30
Abstract: PURPOSE: A sealing container for cooking is provided to protect an internal system of a microwave oven against contamination by preventing the sealing container from breaking by expansion and liquid contents of the container from flowing up. CONSTITUTION: Planar bodies are folded and made of flexible synthetic resin. Edge portions(41a.42a,43a,41b,42b,43b) except lower edge portions(44a) are stuck respectively. A synthetic resin support body is mounted inside of the lower edge portions(44a) for a planar body standing. An outlet hole(6) is formed in at least one of the upper folded planar bodies except an adhered portion. An adhesive portion(7) is around the outlet hole(6). The folded planar bodies are adhered to each other.
Patent KR-20010008561-A (KR)
Inventor: CHO JIK HO
IPC: H01L21/28
Filed: 1999-07-02
Abstract: PURPOSE: A method for forming a contact hole of a semiconductor device is provided to reduce a resistance value among a plug polysilicon layer, a substrate and a gate polysilicon layer accumulated within a contact hole. CONSTITUTION: A method for forming a contact hole of a semiconductor device comprises the following steps. A field oxide layer(20) is formed on a semiconductor substrate(10). A gate polysilicon layer(30) is formed thereon. An insulating layer(40) is stacked on the resultant. A photoresist layer having a contact portion is accumulated on a portion for forming a wiring line. A dry etching process for the insulating layer is performed through the contact portion of the photoresist layer. A contact hole is formed therefrom. An edge portion of the gate polysilicon layer is processed to a round shape. A plug polysilicon layer(60) is buried within the contact hole and ions are implanted therein.