baber/WOPTO huggingface dataset:
Patent KR-20010086849-A (KR)
Title: digital data record/play apparatus and data processing method thereof
Inventor: OH JIN UK
IPC: G11B20/10
Filed: 2000-03-03
Abstract: PURPOSE: A data restoring method is provided to prevent erroneous record of new data even in power-off by enabling restoration of data recorded before power-off. CONSTITUTION: A chapter number is stored after increased by 1(100). Judgment is made if a starting DBIT number of a corresponding chapter is recorded in a CAT. A DBIT entry number of the corresponding chapter is read from the CAT(130). The first page is designated in a block corresponding to the DBIT entry number(140). Judgment is made if data is recorded in the first page of the block recorded in an entry number of a data record area in a flash memory(150). The number of pages in use of the corresponding chapter in the CAT is increased(160). The next page is designated(170). Judgment is made if the designated page is the last page of the corresponding block(180). The number of the recorded chapters and the number of the used pages are recorded(200,210).
Patent KR-20000062747-A (KR)
Title: 안테나 장치
IPC: H01Q21/29
Filed: 2000-03-04
Abstract: 전자파를 송신 또는 수신하는 안테나 소자(302)를 지판(301)상에 배치하고, 전기 공급이 없는 안테나 소자(303∼306)를 지판(301)상에 안테나 소자(302)를 중심으로 하여 동심원상에 등간격으로 배치하고, 안테나 소자(303∼306) 각각의 소자단과 상기 지판 사이에 스위칭 소자(307∼310)와 캐패시턴스(311∼314)를 병렬로 배치하며, 스위치 소자(307∼310) 중 하나를 절단하고, 다른 전부를 접속한다.  이에 따라, 소형이면서 고 이득으로 지향성을 전환할 수 있는 안테나 장치를 제공한다.
Patent KR-20010087979-A (KR)
Title: Channel selector for wireless repeater having gain adjusting funcution, and channel selecting type wireless repeater using the same
Inventor: KWON CHEOL
IPC: H04B1/59
Filed: 2000-03-09
Abstract: PURPOSE: A channel selecting apparatus for a wireless repeater having a gain adjusting function and wireless repeater with a channel selection type using the same is provided to selectively execute a wireless relay to a plurality of communication companies and automatically execute a gain adjustment to a selected communication channel. CONSTITUTION: A mixer(21) mixes a certain local oscillation frequency(L0) to an inputted RF signal and generates an IF signal. A signal splitting unit(22) splits the IF signal inputted from the mixer(21) as a plurality of signals. A filter unit(23) filters each frequency signal outputted from the signal splitting unit(22) and divides each frequency according to a channel assigned to each communication company to output the divided frequency. The filter unit(23) has a plurality of BPFs(231-23n). A plurality of gain adjusting units(241-24n) adjust signal gains of band signals outputted from the BPFs(231-23n) so that signal intensities of the band signals are uniform. A signal synthesizer(25) synthesizes output signals of the gain adjusting units(241-24n). A mixer(26) mixes the local oscillation frequency(L0) with a signal outputted from the signal synthesizer(25).
Patent KR-20010091744-A (KR)
Title: A method and a computer system using internet in which a buyer selects a seller and picks up goods
Inventor: CHUNG DAI JIN
Filed: 2000-03-17
Abstract: PURPOSE: An Internet sales method and system for selecting a seller on the assumption that a purchaser directly picks up goods are provided to offer a method and system that a purchaser selects and orders a commodity using the Internet and directly picks up it at a desired place. CONSTITUTION: A purchaser inputs his personal information, a desired brand, a desired place to pick up goods, a desired date and time to pick up them, etc., to a server using a purchaser computer(22). Sellers input sales suggestion information to the server using their seller computers(23). The purchaser selects one of the sellers who expressed their sales intention, and inputs the selected seller's name to the server using the purchaser computer(24).
Patent KR-20010006850-A (KR)
Inventor: GERD FRANKOVSKI
IPC: G11C7/00
Filed: 2000-03-22
Abstract: PURPOSE: A pointer including a pointer with almost a same delay concerning a clock is necessary. CONSTITUTION: A pointer generating circuit supplies a clock cycle; a shift register has plural latches for storing data bits; a switch by which a first latch receives a flag bit at a first clock cycle of the clock and transfers the flag bit to a shift register at the first clock cycle connects the last latch to the first latch after the flag bit has been transferred to the shift register; the flag bit is transferred to the next latch, and when the next latch is the final one, this latch is made to be a first latch, and thus, a pointer signal is generated in each consecutive clock according to the data bit stored in the clock cycle and latch in each clock cycle.
Patent KR-20010093579-A (KR)
Title: Composition for Novel Polymer Electrolytes Based on the Porous Membrane and Manufactering Method Thereof
Inventor: LEE YEONG GI
IPC: H01M10/0565
Filed: 2000-03-29
Abstract: PURPOSE: A polymer electrolyte composition in which liquid electrolyte is supported inside a porous polymer membrane and a method for manufacturing the same are provided to manufacture a polymer electrolyte by supporting the liquid electrolyte onto the porous polymer membrane after coating a polymer having superior compatibility with the liquid electrolyte to a thin thickness on the surface of a porous polymer membrane and inside micro pores. CONSTITUTION: The polymer electrolyte composition is characterized in that liquid electrolyte consisting of constituents (d) and (e) is infused into micro pores after coating the melted material on the surface of a porous polymer membrane and inside micro pores of constituents(a) after melting a polymer of constituents(b) having good affinity with the liquid electrolyte together with inorganic materials represented as constituents(c). The method for manufacturing the polymer electrolyte composition comprises the steps of drying the coated porous polymer membrane after dipping a porous polymer membrane into a solution in which polymer is dissolved together with inorganic materials using the above composition so as to coat the surface and inside the porous polymer membrane; drying again the coated membrane after coating the surface of the dried membrane with a solution in which polymer is dissolved with inorganic materials; and supporting the manufactured porous polymer membrane together with liquid electrolyte onto a mixed solvent under the atmosphere of argon.
Patent KR-20000037011-A (KR)
Inventor: BAEK JONG IN
Filed: 2000-04-04
Abstract: PURPOSE: An advertising method using a game that an on-line and an off-line game are combined and the system thereof are provided to increase advertising effect by drawing the active participation of consumers and to expand the participation of advertising to small-scale advertisers who want advertising locally as well as advertisers who want advertising over wide area. CONSTITUTION: A game participant connects with a server through a common connection network(200) and participates in a fist game(215). The game participant obtains a first information, all information for a wanted person whom the participant has to look for on the off-line(220). The participant releases the connection of the server(225), then participates in a second game with the first information(230). After obtaining a second information(235), the game participant connects with the server again(240). The participant informs the server of his participation in the second game, and applies for a question provided by the server(245). The participant confirms whether he drew a prize(250).
Patent KR-20000071580-A (KR)
Title: 단말, 원격 통신 시스템 및 접속 방법
IPC: H04M11/00
Filed: 2000-04-06
Abstract: 본 발명은, 접속이 설정되기 전에 적용 가능한 요금을 사용자에게 나타내거나 혹은 선불 수단을 포함하는 단말에 계산 요소를 제공하기 위해  원격 통신 네트워크의 하나 이상의 목표(target) 단말을 그 목적지(destination)로 갖는 요금 정보의 생성을 가능하게 한다. 이러한 목적을 위해, 상기 요금 정보는 상기 접속을 설정하기 위해 전송되고 및 상기 접속이 설정되기 전에 하나 이상의 단말에 의해 수신될 목적을 갖는 표준화된 호출 제어 메시지에서 코딩된다.
Patent KR-20010090899-A (KR)
Inventor: TEA EUN HE
Filed: 2000-04-07
Abstract: PURPOSE: A method and a system for an internet reservation sales of a duty-free article by a two-step card payment method is provided to buy a duty-free article through an internet electronic commercial transaction by performing a paying approval when a commodity is delivered after a reservation of a buying commodity through the internet based on a two-step payment method. CONSTITUTION: In this method, a wanted duty-free article is selected out of a plurality of duty-free articles being provided through an internet site(425, 430) by a user. Identification information of a buyer and information related to a credit card are inputted(435). A credit transaction approval is requested in a financial paying server based on the above inputted information(440). If the approval is received, an approval number is created(450). A paying request is performed using the approval number(470). A confirming of the payment is requested to the financial paying server by responding to the paying request(475).
Patent KR-20000037346-A (KR)
Inventor: HONG JEONG PYO
Filed: 2000-04-19
Abstract: PURPOSE: A system and method for executing counterauction for communication goods through a network and record media for recording the method is provided so that an user can compare communication cost of several communication businessmen and can communicate with low cost by several communication businessmen offering communication cost as bids when an user, who intends to use communication goods, input expected communication time during prescribed duration. CONSTITUTION: A system and method for executing counterauction for communication goods through a network includes several steps. A first step is to receive bids for communication cost per unit from a plurality of communication businessmen and users and to store them in a database of a server. A second step is that a plurality of users input their expected communication time(108). A third step is to apply bids of communication businessmen to the expected communication time and to notice the calculated communication cost as bid condition(114). A fourth step is to award the contract to one of communication businessmen(116).
Patent KR-20010097939-A (KR)
Inventor: PARK HEON SEOB
IPC: F24F1/00
Filed: 2000-04-27
Abstract: 본 발명은 실내공기청정시스템 및 공기청정장치에 관한 것으로, 좀 더 상세하게는 오염된 실내공기를 통상의 1차공기정화필터와 참숯 또는 황토를 이용한 2차공기정화필터가 장착된 공기정화장치를 통해 정화된 청정공기를 실내로 배출시킴으로서 인체에 이롭고 쾌적한 생활환경을 조성하는 것에 관한 것이다. 
     이에 본 발명의 실내공기청정시스템 및 공기청정장치는 공기청정장치를 구동시키는 전원스위치; 오염된 실내공기를 흡입하는 디퓨저; 상기 디퓨저를 통하여 흡입된 오염공기를 여러방향으로 분배시키는 다분기관; 상기 다분기관을 통하여 분배된 오염공기를 운반하는 공기이송관; 상기 공기이송관과 연결되도록 상부는 관접속수단을 갖추고 하부는 경사지게 절단한 상태로 상기 공기청정장치 내로 삽입 설치되는 유입관; 상기 유입관을 통하여 유입된 오염공기를 청정공기로 정화시키는 1차 및 2차공기정화필터가 내장된 공기청정장치; 로 구성되는 것을 특징으로 한다.
Patent KR-20010098066-A (KR)
Inventor: KIM JAE IL
IPC: C07K14/00
Filed: 2000-04-28
Abstract: 본 발명은 35개의 아미노산 서열(서열 번호 1)을 지닌는 펩타이드 신경독소를 펩타이드 합성에 필요한 아미노산 유도체를 이용 합성하고, 합성된 펩타이드를 시스틴 결합시켜, 3차구조를 갖는 펩타이드 신경독소를 제조한 후, 칼럼을 통해 정제시킴을 특징으로 하는 펩타이드 신경독소의 제조 방법을 제공하는 것이다.
Patent KR-20000049948-A (KR)
Inventor: KWAK EUN KYUNG
Filed: 2000-05-09
Abstract: PURPOSE: A character business method based on the Internet is provided to promote efficiency with cheap costs by creating and dealing with characters on the Internet CONSTITUTION: A character business method based on the Internet, in processing functions about characters, comprises the steps of: outputting main page; executing a sub routine of requested resource process according to select of info-shop function; executing creation and deal according to select of a gallery function; executing a sub routine of e-commerce according to select of a shopping mall function; executing a sub routing of card transmission according to select of a card function; and executing chatting process according to select of a chatting function.
Patent KR-20000077242-A (KR)
Title: 마그네슘 합금의 표면처리 방법
IPC: C23C22/78
Filed: 2000-05-12
Abstract: 본 발명은 우수한 내식성, 높은 도료(paint) 피막 부착성 및 낮은 표면 전기 저항을 제공하기 위한 마그네슘(Mg) 합금의 표면 처리 방법에 관한 것이다. 
     pH 1 ∼ 5의 산 수용액으로 표면을 에칭하고, 및 그 후 유기 인(phosphorus)화합물을 함유한 pH 7 ∼ 14의 알칼리성 수용액과 접촉을 이룬다. 상기는 에칭 단계에 앞서서 알칼리성 수용액으로 또는 산성 수용액으로 탈지하는 하는 것을 권고할 수 있다. 산성 수용액은 바람직하게 글리콜릭 산(glycolic acid), 구연 산 (citric acid), 주석 산(tartaric acid), 사과 산(malic acid), 수 산(oxalic acid), 멜로닉 산(malonic acid), 포름 산(formic acid), 유 산(lactic acid), 아세트 산 (acetic acid), 글루타릭 산(glutaric acid), 프로피오닉 산(propionic acid), 낙산(butyric acid), 안식향 산(benzoic acid), 프탈 산(phthalic acid)에서 선택된 탄산(carbonic acid)으로부터 선택된다. 또한, 유기 인화합물은 바람직하게 인산 화합물이다. 상기 처리 후, 오소포스포릭 산(orthophosphoric acid) 및 금속 이온을 함유한 pH 2 ∼ 6의 산성 수용액을 추가로 접촉시키는 것이 바람직할 수 있고, 또한, 플루오르 화합물을 함유한 산성 수용액과 접촉시키는 것이 바람직할 수 있다.
Patent KR-20000054161-A (KR)
Inventor: HAN KYU KAB
Filed: 2000-05-24
Abstract: PURPOSE: A character fabrication using an internet and a character product ordering system and a method of the same are provided for easily fabricating himself character using an internet and printing the character on a business card, a T-shirt, a key holder, and a mug cup. CONSTITUTION: When a center site(10) is connected with a member site(110) through a network like an internet(100), a home page(13) is displayed(S10). It is checked whether the user connected with the center site(10) is a verified member based on a member information database(D9)(S20). The member who is not verified, the member is registered(S25). The verified member selects a character format(cartoon, caricature, simulated format) using an icon(S30).
Patent KR-20010007235-A (KR)
Inventor: CHOU CHUEN-SHYONG
IPC: B29C48/08
Filed: 2000-06-05
Abstract: PURPOSE: A capstock composition which is useful for extruding into articles and for application to structural plastics such as poly(vinyl chloride) to prepare composites is provided. CONSTITUTION: The capstock composition comprises (A) 70-99 wt.% of a first core/shell polymer including (i) 30-70 wt.% of a core polymer including (a) 45-99.9 wt.% of units derived from at least one C1-C8 alkyl acrylate monomer, (b) 0-50 wt.% of units derived from at least one ethylenically unsaturated copolymerizable monomer different from the at least one C1-C8 alkyl acrylate monomer, and (c) 0.1-5 wt.% of units derived from at least one crosslinker or graftlinker, and (ii) 30-70 wt.% of a shell polymer grafted to the core polymer (A) (i) including (a) 80-99 wt.% of units derived from at least one C1-C8 alkyl methacrylate monomer, and (b) 1-20 wt.% of units derived from at least one ethylenically unsaturated copolymerizable monomer different from the at least one C1-C8 alkyl methacrylate monomer; and (B) 1-30 wt.% of a second core/shell polymer including (i) 70-92 wt.% of a core polymer including (a) 50-99.9 wt.% of units derived from at least one C1-C8 alkyl acrylate monomer, (b) 0-45 wt.% of units derived from at least one ethylenically unsaturated copolymerizable monomer different from the at least one C1-C8 alkyl acrylate monomer, and (c) 0.1-5 wt.% of units derived from at least one crosslinker or graftlinker; and (ii) 8-30 wt.% of a shell polymer grafted to the core polymer (B)(i) including (a) 50-100 wt.% of units derived from at least one C1-C8 alkyl methacrylate monomer, and (b) 0-50 wt.% of units derived from at least one ethylenically unsaturated copolymerizable monomer different from the at least one C1-C8 alkyl methacrylate monomer, wherein the shell polymer (B)(ii) has a shell molecular weight in the range of 25,000 to 350,000 g/mol.
Patent KR-20010111684-A (KR)
Inventor: KIM JONG SU
Filed: 2000-06-13
Abstract: 본 발명은 자동차 카울의 강성증대구조에 관한 것으로서, 보다 상세하게는 카울패널과 쇽압쇼버 하우징이 결합되는 부분의 급단면부에 거세트를 보강한 카울의 강성증대구조에 관한 것이다. 
     본 발명의 목적은 카울패널과 쇽압쇼버 하우징간의 급단면 접착부위가 주행중 각종 복합하중을 받더라도 충분히 그 하중에 대한 강성을 갖고, 또 집중하중을 분산할 수 있도록 그 급단면 부위에 보강재인 거세트를 삽입함으로써, 차후 발생할수 있는 용접점의 파단을 방지하고 비틀림 강성을 증대하는데 있다. 
     따라서 바람직한 일 실시예를 통하여 본 발명은 펜더 에이프런의 인너측에 그 펜더 에이프런과 일체로 형성된 쇽압쇼버 하우징의 일측을 카울패널과 접합함에 있어서, 쇽압쇼바 하우징의 일측벽부와 카울패널 하부에 형성된 절곡수평면이 이루는 급단면 부위에 거세트를 설치한 것을 특징으로 하는 자동차의 카울 강성증대구조이다.
Patent KR-20010113998-A (KR)
Inventor: LEE JUNG RYOL
IPC: C04B14/10
Filed: 2000-06-20
Abstract: 본 발명은 건축용 황토에 관한 것으로서, 보다 상세하게는 원적외선을 방사시키는 천연황토를 주 재료로 하여 숯이나 솔잎 및 갈대 등을 소정비율로 혼합하여 난방 바닥 시공용으로 사용할 수 있는 건축용 황토 혼합물 제조방법에 관한 것이다. 
     본 발명의 목적은 인체에 유익한 원적외선을 방출하고 방안의 습기조절능력이 뛰어나며 시공후에도 표면이 미려한 건축용 황토 혼합물 제조방법을 제공하는데 있다. 
     상기의 목적을 달성하기 위한 본 발명은, 천연황토를 물에 투입하여 소정시간동안 숙성시키는 공정과, 숯가루를 고르게 분쇄시키는 공정과, 쑥을 말린 후 미세하게 분쇄시키는 공정과, 솔잎을 말린 후 미세하게 분쇄시키는 공정과, 갈대잎을 말린후 미세하게 분쇄시키는 공정과, 소금을 물에 녹이는 공정과, 옥가루를 제조하는 공정과, 참나무 껍질을 말린 후 미세하게 분쇄하여 혼합하는 공정과, 상기 전 공정에서 제조된 각각의 재료를 혼합하여 골고루 교반하는 공정과, 상기 공정에서 제조된 황토 혼합물을 비닐 등으로 포장하는 공정으로 이루어지는 것을 특징으로 한다.
Patent KR-20020000568-A (KR)
Title: Fraud prevention system and method over electronic or credit card commerce
Inventor: CHOI YEONG OK
Filed: 2000-06-23
Abstract: PURPOSE: A system and a method for preventing accidents in e-commerce are provided to generate an optimum accident forecasting model through the data mining due to a neural network and an accident forecasting modeling due to a statistical program, and forecast accurately accidents based on know-how in work-site. CONSTITUTION: An admission server(20) confirms card trade data to determine the admission when chain stores request card trade admission. An accident prevention server(40) generates an accident forecast model, forecasts whether the card trade data transmitted from the admission server(20) are accident trade data by using a neural network accident forecast model and the accident forecast model, and sends feedback of the forecasted results to the admission server. A monitoring part(60) searches the accident trade in real-time by automatically calling corresponding members and the chain stores when the accident trade is forecasted.
Patent KR-20010044055-A (KR)
Inventor: HYON BYONG WOOK
IPC: F16L55/00
Filed: 2000-06-27
Abstract: PURPOSE: A pipeline cover extends the life of pipelines installed on the outer wall of a building, reduces the installation cost thereof and prevents an outsider from intruding. CONSTITUTION: Holes(5) penetrate a pipe(1) equally divided. Multiple wedges(2) are fixed to the holes(5). The wedges(2) cannot be pulled off because of the conical forms thereof and cannot be pushed off because of a pipeline(11) inside. The wedges(2) may have screws thereon to be fixed to the holes(5) with nuts formed thereon. A groove is formed on one end surface of the pipe(1) and a protrusion is formed on the other end surface of the pipe(1) to be engaged with each other. The pipe(1) is assembled and extended by engaging the groove(3) with the protrusion(4).
Patent KR-20020002550-A (KR)
Title: Method and apparatus for e-coupon service
Inventor: GRONG CHOONG SUB
Filed: 2000-06-30
Abstract: PURPOSE: A method and an apparatus for servicing an electronic coupon are provided to promote a usage of a member store through the electronic coupon by transmitting the electronic coupon to a mobile communication terminal user who is around the member store. CONSTITUTION: A mobile communication terminal(100), which is connected with an electronic coupon servicing apparatus through a network such as a mobile communication network or a computer communication network, receives an electronic coupon. A base station(102) outputs location information of the mobile communication terminal(100) by using a GPS(Global Positioning System). A database(120) stores client information and electronic coupon information such as personal information and location information of the mobile communication terminal(100). An electronic coupon transmitting server(110) transmits the electronic coupon selected by the location information of the mobile communication terminal(100) to the mobile communication terminal(100) through the base station(102).
Patent KR-20010015293-A (KR)
Inventor: BARANI STEPANO
IPC: B62D55/215
Filed: 2000-07-12
Abstract: PURPOSE: Disclosed is a chain for forming an endless track capable of preventing a sprocket wheel and a bushing from being worn out, which has pluralities of links improved so as to reduce the frictional force between the sprocket wheel and the links or between the bushing and the links. CONSTITUTION: The chain for forming a track comprises pluralities of links. The links(2) are composed of two plates(3,4) having two spaced ends and two neighboring ends, respectively. The two spaced ends form outer collars(5,6) which are supported on a connecting pivot(13). The two neighboring ends form inner collars(7,8) which are positioned on the same pivot as of the collars(5,6). The inner collars(7,8) are fitted into a sleeve which is supported on the pivot. A bushing(24) is disposed on the sleeve at a position between the two neighboring ends. The pivot(13) traverses an axle hole connected with a section in which the sleeve slides along the pivot(13).
Patent KR-20010029939-A (KR)
Title: Voltage regulation for integrated circuit memory
Inventor: CHEN CHUN
IPC: G11C16/30
Filed: 2000-07-13
Abstract: PURPOSE: An integrated circuit having memory cell and a method for driving the same are provided to take the margin of program interference large, while programming speed is set to be the highest by forming a voltage adjusting unit used with a memory device in a doped well region in an integrated circuit. CONSTITUTION: A memory cell is formed in a p-type well(102) and an n+ source area(105) is connected to VSS (OV) through a conductor(114). The p-type well(102) is connected to a negative voltage source(113) via a p+ well joint region(103) and a conductor(112). The negative voltage source(113) is set as a charge pump, arranged on IC similar to a memory array and a high impedance voltage source(116) and a low impedance voltage source(118) are set as charge pumps. A current gain for making current injected into the p-type well(102) from the low-impedance voltage source(118) to be minimum is obtained and the fluctuation of the memory cell from the low-impedance voltage source(118) is set minimum.
Patent KR-20010015354-A (KR)
Title: An optical assembly and a method for manufacturing lens systems
Inventor: BOWEN JOHN P
IPC: G02B3/00
Filed: 2000-07-18
Abstract: PURPOSE: Provided is a process for producing a lens assembly which is capable of exactly assembling extremely small lens elements into a lens system when these elements become a part of lens arrays. CONSTITUTION: This process produces the lens assembly having the plural lens arrays having a plurality of small lenses and at least one space having plural holes. In such a case, this process for producing the lens assembly has a step of arranging the at least two lens arrays described above and the spacer described above in such a manner that the spacer exists between the two adjacent lens arrays, that the small lens of the one lens array of the two lens arrays overlaps on the small lens of the other lens array and that the holes described above exist between the small lenses, a step of forming the array assembly by fixing and mounting the lens arrays and the spacer to each other and a step of forming the assembly as a single assembly or dividing the assembly to form the plural individual lens systems.
Patent KR-20020009264-A (KR)
Title: Method of forming plugs in a semiconductor device
Inventor: CHUN SEONG GIL
IPC: H01L21/28
Filed: 2000-07-25
Abstract: PURPOSE: A contact plug formation method of semiconductor devices is provided to improve gap filling properties and to prevent a short between bit lines by using an HLD(High temperature Low pressure Dielectric) oxide. CONSTITUTION: After forming a gate oxide(22) on a silicon substrate(20) having a field oxide(21), a gate(23) as a word line is formed on a gate oxide. After forming a spacer(25) at both sidewalls of the gate, a BPSG(BoroPhospho Silicate Glass)(260) as a first interlayer dielectric is deposited on the resultant structure. An HLD oxide(270) as a second interlayer dielectric is formed on the first interlayer dielectric. A contact hole is formed by sequentially etching the HLD oxide(270) and the BPSG(260) using a hard polysilicon mask. An HLD oxide as a sacrificial oxide is filled into the contact hole and entirely removed in order to remove voids. Then, a contact plug(300) is re-filled into the contact hole.