baber/WOPTO huggingface dataset:
Patent KR-20040049609-A (KR)
Inventor: CHOI YUN CHEOL
IPC: F25D17/08
Filed: 2002-12-06
Abstract: PURPOSE: An apparatus for controlling cold air supply in a refrigerator is provided to appropriately control an inner temperature of a special selection storage chamber according to a change in a load. CONSTITUTION: A main body(1) is divided into a freezing chamber(10) and a refrigerator compartment(20) by a separation wall(16) to load with foods. A special selection storage chamber(30) is divided by a separation member(31) as an extra space in the refrigerator compartment. A cooler chamber(2) has a cooling device for generating cold air required for cooling the inside of the main body. A cold air guide passage(15) guides the cold air generated in the cooler chamber to be supplied to the refrigerator compartment, and discharges the cold air into the refrigerator compartment. A rotary damper(40) is mounted at an inflow port(33) communicated with the cold air guide passage to flow the cold air into the special selection storage chamber so that the rotary damper controls an amount of the cold air.
Patent KR-20040050589-A (KR)
Inventor: CHO GYU HYEONG
IPC: H03F1/32
Filed: 2002-12-10
Abstract: PURPOSE: A variable gain amplifier is provided to provide a variable gain amplification function to an input signal and thus to have a wide band operation characteristics by a stable current bias. CONSTITUTION: The first unit inputs the first and the second input voltage differentially. The second unit generates various output currents by controlling an amplitude of transconductance according to a control voltage. The third unit generates a mirror type current by inputting the control voltage and the bias voltage differentially, and supplies a stable current to the second unit using the mirror current. And the fourth unit generates an output voltage having a variable gain according to the output current generated by the second unit.
Patent KR-20040051270-A (KR)
Title: Refrigerator having a negative ion generator
Inventor: JUN YONG DEOK
IPC: F25D23/00
Filed: 2002-12-12
Abstract: PURPOSE: A refrigerator having a negative ion generator is provided to reduce power consumption of a refrigerator by operating a negative ion generator for a predetermined time only when a refrigerator compartment is opened. CONSTITUTION: A negative ion generator(20) is installed inside a refrigerator compartment. A door switch(30) is installed between a front end of a main body of the refrigerator compartment and a refrigerator compartment door so that the door switch is turned on and off by opening and shutting of the refrigerator compartment door. When the refrigerator compartment door is opened, the door switch is turned on. A controller(40) for the negative ion generator is connected with the door switch to drive the negative ion generator when the door switch is turned on. The controller counts a predetermined time so that the controller stops the negative ion generator if the counted time passes.
Patent KR-20040053490-A (KR)
Title: A process for the preparation of black sesame oil
Inventor: CHUNG HA YULL
IPC: A23D9/00
Filed: 2002-12-14
Abstract: PURPOSE: A method of making black sesame oil by soaking black sesame in water, drying to a moisture content of 10 to 30% by weight, roasting and then pressing is provided. The product so prepared has excellent oxidation stability and minimized quality degradation due to oxidative deterioration and exhibits excellent antioxidative effect during ingestion. CONSTITUTION: Black sesame is soaked 2 to 5 times in water for 1 to 5hr and hydrated or dried to a moisture content of 10 to 30% by weight. Then, the dried black sesame is roasted for 20 to 150min at 150 to 250deg.C and pressed with an oil press. The oil press is used after preheating at 150 to 180deg.C. The black sesame oil shows a low peroxide value, a long oxidation inducing period and high sesamol content.
Patent KR-20040055454-A (KR)
Title: Method of forming contact plug for semiconductor device
Inventor: KIM JAE HONG
IPC: H01L21/28
Filed: 2002-12-21
Abstract: PURPOSE: A method for forming a contact plug of a semiconductor device is provided to completely separate an LPP(landing plug polysilicon) layer without varying a critical dimension of a wordline by performing a CMP(chemical mechanical polishing) process while properly controlling the pressure of a retaining ring related to a polishing rate of a wafer edge. CONSTITUTION: A wordline(100) made of a gate(15) and a hard mask(16) is formed in a semiconductor substrate. A spacer is formed on the sidewall of the wordline. An interlayer dielectric(17) is formed on the semiconductor substrate. The interlayer dielectric is etched to expose a part of the substrate and to form a contact hole. An LPP layer is formed on the interlayer dielectric to fill the contact hole. The polysilicon layer is blanket-etched by a CMP process performed in a polishing pressure condition with a comparatively high pressure of the retaining ring so that the surface of the hard mask is exposed to completely separate the polysilicon layers.
Patent KR-20040056889-A (KR)
Title: Thermal spray coated roll for anti-corrosion and wear resistant properties
Inventor: CHO JAE EOK
IPC: C23C4/04
Filed: 2002-12-24
Abstract: PURPOSE: A WC thermal sprayed roll having superior corrosion resistance and wear resistance is provided which reduces repairing cost and improves productivity by simultaneously satisfying corrosion resistance and wear resistance. CONSTITUTION: The WC thermal sprayed roll having superior corrosion resistance and wear resistance is characterized in that it is manufactured by performing metal based high corrosion Cr-Fe-Ni-Mo-B based thermal spray coating on a matrix metal, thereby forming first layer, and performing WC-Co-Cr based WC thermal spraying on the first layer, thereby forming second layer.
Patent KR-20040057304-A (KR)
Title: Battery Cell Nickel-Terminal Automatic Cutting Machine
Inventor: SHIN DONG O
IPC: H01M2/10
Filed: 2002-12-26
Abstract: PURPOSE: Provided is an apparatus for cutting nickel terminals of a battery cell automatically, which cuts a nickel terminal assembly into each nickel terminal and places the nickel terminals on both terminals of the battery cell automatically. CONSTITUTION: The apparatus comprises: a nickel terminal assembly placing means(100) placing the nickel terminal assembly(6) on both sides of a rail(18) automatically; a nickel terminal assembly moving means(200) moving the nickel terminal assembly(6) by 1 pitch of the nickel terminal in order; a nickel terminal cutting means(300) forming each nickel terminal by the interaction of punches and a dice; a nickel terminal moving means(400) placing the nickel terminal on a terminal part of the cell laid on a pallet; and a cell contact means(500).
Patent KR-20040057401-A (KR)
Inventor: AHN GWANG HYEOP
IPC: F25D11/00
Filed: 2002-12-26
Abstract: PURPOSE: A concentrated cooling device of a refrigerator and a method thereof are provided to improve cooling efficiency by supplying cold air to the high temperature load concentrically with scanning temperature at entire spots of respective shelves of the refrigerator. CONSTITUTION: A refrigerator comprises infrared sensors(IR1-IR3) attached to the left or right upper parts of shelves in the refrigerator compartment to detect temperature of each spot of the shelf; a microcomputer outputting the concentrated cooling signal by comparing the temperature of the shelf with the reference temperature; concentrated cooling dampers(CD1-CD3) attached to the left or right upper parts of the refrigerator compartment to supply cold air to the spot corresponding to the concentrated cooling signal; and a display unit(DP) selectively displaying temperature of each spot from the infrared sensor and concentrated cooling process.
Patent KR-20040057500-A (KR)
Title: Method for fabrication of shallow trench isolation of semiconductor device
Inventor: KIM SANG IK
IPC: H01L21/76
Filed: 2002-12-26
Abstract: PURPOSE: A method for forming an isolation layer of a semiconductor device is provided to be capable of improving gap-filling of fine patterns. CONSTITUTION: A trench mask including a pad oxide and a pad nitride is formed on a semiconductor substrate(30). A trench is formed by selectively etching the substrate using the trench mask. A dielectric film(33) with low-permittivity is partially filled in the trench. An oxide layer(34) is formed on the dielectric film to entirely fill the trench, thereby forming a stacked isolation layer(35) including the oxide layer and the dielectric film.
Patent KR-20030011058-A (KR)
Title: Searching System for a missing child with e-mail leaflets
Inventor: KIM NAM GYU
IPC: G06Q50/22
Filed: 2002-12-28
Abstract: PURPOSE: A system for an Internet leaflet searching for a missing child by using an Internet mail is provided to minimize the time and the mental and financial loss of a parent by making all nations search for the missing child and to reduce a corresponding business and expense by distributing the business of each organization. CONSTITUTION: An online and an offline mail leaflet are forwarded to each home and public organization(A104) by a missing child search program. If the members(A-103,A-103) registered to a homepage download and install the missing child search program like a general messenger program and reboot a computer, the missing child search program automatically logs in to a server. The server transmits all reported contents to the missing child search program and the members(A-103,A-103) can see the information for the missing child.
Patent KR-20020035616-A (KR)
IPC: H01L21/8246
Filed: 2000-09-15
Abstract: 본 발명은 반도체 기판(11) 상의 두 소스/드레인 영역(13)과 그 사이의 채널 영역을 포함하는 강유전성 트랜지스터에 관한 것이다.  Al 2 O 3 를 함유하는 제 1 유전성 중간층(14)이 채널 영역의 표면 상에 위치한다.  강유전성 층(15)과 게이트 전극(16)이 제 1 유전성 중간층(14) 위에 배치된다.  채널 영역으로부터의 보상 전하의 터널링이 제 1 유전성 중간층(14) 내의 Al 2 O 3 를 이용하여 제 1 유전성 중간층(14) 내에서 억제되어, 데이터 저장 시간이 개선된다.
Patent KR-20020071012-A (KR)
Title: Processes for preparing clarithromycin polymorphs
IPC: A61K/
Filed: 2000-12-15
Abstract: The present invention relates to processes for converting clarithromycin Form I to clarithromycin Form II, which include slurrying clarithromycin the Form I in water. The present invention also relates to processes for the preparation of clarithromycin Form II by converting erythromycin A to clarithromycin and thereafter converting clarithromycin Form I to clarithromycin Form II by slurrying.
Patent KR-20030014349-A (KR)
IPC: H05K9/00
Filed: 2001-01-24
Abstract: 본 발명은 액세스 패널과 출입구 주변의 전자 장비 외피 등에 사용하는 EMI 차폐부품의 제조방법에 관한 것이다. 상기 차폐부품은 도전성 요소와 함께 비도전성 기판을 포함할 수 있다. 본 발명의 일 실시예에서, 상기 방법은 상기 기판 표면 위에 도전층을 적층하기 위하여 증착공정, 도금공정 또는 도장공정을 사용할 수 있다. 본 발명의 다른 실시예에서, 상기 방법은 상기 기판내에 도전성 요소들을 산재시키기 위해서 폼 형성법을 사용할 수 있다. 상기 도전층 및 도전성 요소는 효과적인 차폐 및 접지기능을 제공하며 상기 기판은 차폐부품에 탄성을 제공한다.
Patent KR-20030004354-A (KR)
IPC: C07K14/705
Filed: 2001-02-23
Abstract: 신규 단백질 및 그것을 코드하는 유전자를 제공한다. 
     신장에 특이적으로 발현하고, 기계자극에 응답하여 비선택적으로 양이온을 세포내에 거두어 들이는 기능을 갖는, 마우스 혹은 사람 유래의 신규한 기계자극 응답 채널 단백질. 그 단백질을 코드하는 DNA. 그 단백질을 사용하여 양이온 채널 활성을 항진 또는 저해하는 물질의 스크리닝 방법. 그 단백질에 대한 항체. 
     고혈압증이나 당뇨병 등의 양이온 채널의 이상에 기초하는 질환의 진단약 혹은 치료제. 또는 그 질환에 대한 예방 및/ 또는 치료제 탐색을 위한 도구로써 유용.
Patent KR-20020082226-A (KR)
IPC: C22B34/12
Filed: 2001-02-20
Abstract: A method of removing oxygen from a solid metal, metal compound or semi-metal M 1 O by electrolysis in a fused salt of M 2 Y or a mixture of salts, which comprises conducting electrolysis under conditions such that reaction of X rather than M 2  deposition occurs at an electrode surface and that oxygen dissolves in the electrolyte M 2 Y and wherein, M 1 O is in the form of a granules or is in the form of a powder which is preferably agitated, for example in a fluidised bed arrangement. Also disclosed is a method of producing a metal foam comprising the steps of fabricating a foam-like metal oxide preform, removing oxygen from said foam structured metal oxide preform by electrolysis in a fused salt of M 2 Y or a mixture of salts. Also disclosed is a method of producing a metal or semi-metal or alloy component comprising the steps of providing a ceramic facsimile (metal oxide or mixture of metal oxides) of the desized metal component and removing oxygen from the facsimile by electrolysis in a fused salt of M 2 Y or a mixture of salts.
Patent KR-20020093847-A (KR)
Title: 무정형 토라세미드 변형물
IPC: A61P31/00
Filed: 2000-05-02
Abstract: 본 발명은 무정형 토라세미드 변형물, 그의 제조 방법, 토라세미드의 약학적으로 허용가능한 염을 제조하기 위한 원료로서의 그의 용도, 상기 무정형 토라세미드 변형물을 포함하는 약학 제형 뿐만 아니라 이뇨제로서의 그의 용도에 관한 것이다.
Patent KR-20030022810-A (KR)
IPC: G06F17/30
Filed: 2001-06-01
Abstract: 본 발명은 네트워크화된 디렉토리에 대한 정보를 수집하기 위한 방법에 관한 것이다. 일 실시예에 있어서, 패킷 스위칭된 네트워크 상에서 디렉토리에 대한 정보를 수집하기 위한 방법이 개시된다. 그 중 한 단계에 있어서, 제 1 웹 사이트용으로 하나의 디렉토리가 결정된다. 이 디렉토리는 첫 번째로 제 2 웹 사이트로 보고된다. 제 1 웹 사이트 상에서의 변화들을 검출한 이후에, 상기 디렉토리는 이 변화들로 갱신된다. 상기 디렉토리는 두 번째로 제 2 웹 사이트로 보고된다.
Patent KR-20040065333-A (KR)
Inventor: HAN DONG HUI
IPC: H01L27/108
Filed: 2003-01-13
Abstract: PURPOSE: A method for manufacturing a semiconductor memory device is provided to be capable of preventing short between a bit line and a storage node contact plug. CONSTITUTION: The first interlayer dielectric(104) with a contact pad(106) is formed on a substrate(100). The second interlayer dielectric(108) is formed on the resultant structure. A conductive layer(110) and a hard mask(112) are stacked on the second interlayer dielectric. A bit line structure(115) is formed by patterning the hard mask, the conductive layer and the second interlayer dielectric. A bit line spacer(114) is formed at both sidewalls of the bit line structure. A storage node contact plug(118) is formed to contact the contact pad between the bit line structures.
Patent KR-20040065638-A (KR)
Inventor: JUNG SEOK HWA
IPC: G06F9/44
Filed: 2003-01-15
Abstract: PURPOSE: A device and a method for displaying an image warning a screensaver operation are provided to warn a user of the screen saver operation and a remaining time to the screensaver operation by detecting the input of a horizontal/vertical synchronization signal. CONSTITUTION: A horizontal/vertical synchronization signal detector(490) detects the input of the horizontal/vertical synchronization signal. A setting part(470) sets a setting time for operating a screensaver and warning the screensaver operation. A counter(480) counts the setting time. A controller(430) counts the time detecting no horizontal/vertical synchronization signal if the input of the horizontal/vertical synchronization signal is detected by the horizontal/vertical synchronization signal detector, and controls the display of a screensaver operation warning display part by comparing the non-detection time with the setting time. An OSD(On Screen Display) generator(440) outputs the screensaver operation warning display part to an OSD depending on the control of the controller.
Patent KR-20040067254-A (KR)
Inventor: CHOI GI SEUNG
IPC: C02F3/02
Filed: 2003-01-22
Abstract: PURPOSE: A bacteria cultivating bioreactor for sewage and wastewater treatment is provided which is designed in such a way that stirring of culture media and uniform supply of oxygen into the culture media are performed at the same time. CONSTITUTION: The bacteria cultivating bioreactor comprises a cultivation can(20) in which microorganisms are cultivated; a supply part comprising a supply pipe connected to an upper part of the cultivation can, and a pump installed on the supply pipe to supply solution to be cultivated to the cultivation can so that the supply part supplies solution to be cultivated and organic and inorganic culture medium into the cultivation can; an agitation part for maintaining aeration in nutrient solution and agitating the nutrient solution vertically and horizontally by injecting the air onto the nutrient solution in the cultivation can after receiving air from an air supplying blower(40); an air control part for preheating air supplied to the agitation part; and a temperature control part comprising a heating pipe(50) which is installed in a coil shape along the inner wall of the cultivation can, and into which refrigerant and heat medium are circulated to cool and heat the nutrient solution, a refrigerant and heat medium tank(53) connected to the heating pipe to heat exchange the refrigerant and heat medium circulated, a lower temperature heater(54) installed inside the refrigerant and heat medium tank to heat the heat medium, a heat medium circulation pump(55) installed on a heat medium supply line to circulate the heat medium, a heater(51) installed inside the cultivation can to sterilize the inside of the cultivation can at high temperature after discharging the nutrient solution, and a controller(70) for controlling operation of the respective heaters.
Patent KR-20040069682-A (KR)
Title: Liquid crystal display
Inventor: LEE DONG HO
IPC: G02F1/1339
Filed: 2003-01-30
Abstract: PURPOSE: An LCD(Liquid Crystal Display) is provided to improve display characteristic of the LCD. CONSTITUTION: An LCD includes the first and second substrates(100,200), a combining member(350) for combining the first and second substrates, and a liquid crystal layer(300) interposed between the first and second substrates. The first substrate includes a display part for displaying images and a driving part for driving the display part. The combining member is interposed between the first and second substrates to cover the driving part. The first substrate includes a transparent electrode(120), an insulating layer(130), and a reflection electrode(140). The transparent electrode is connected to a switching element. The insulating layer is formed on the transparent electrode to cover the contact portion of the switching element and transparent electrode and includes a contact hole(130a) exposing a portion of the transparent electrode. The reflection electrode is placed on the transparent electrode and connected to the transparent electrode through the contact hole. The second substrate includes a common electrode(220).
Patent KR-20030066459-A (KR)
Title: 제조 시스템, 제조방법, 제조장치의 조작방법 및 발광장치
IPC: H01L51/40
Filed: 2003-02-05
Abstract: 매우 고순도인 EL재료를 이용하여 증착하고, 발광소자의 신뢰성 및 휘도를 높이는 제조 시스템을 제공한다. 또한, EL 재료를 효율적으로 사용한다. 유리병을 이용하지 않고, 재료 메이커(18)에서 증착장치에 설치된 예정의 용기(제 1 용기(11a)에 EL 재료(12)를 직접 승화정제 또는 수납하고, 이송 후에 발광장치 메이커(19)에서 증착을 하는 제조 시스템으로 함으로써, 고순도인 EL재료로의 불순물 혼입방지를 실현하는 것이다. 또한, 용기를 재료 메이커에 의해 회수시키고, 용기에 남은 EL 재료를 추출하여, 재이용하는 제조 시스템으로 하여도 된다.
Patent KR-20030067581-A (KR)
Title: 반도체 기억 장치
IPC: H01L27/108
Filed: 2003-02-07
Abstract: 본 발명은 센스 앰프 영역의 사이즈를 축소한 반도체 기억 장치를 제공하기 위한 것으로서, 메모리 셀 어레이의 상보 비트선에 접속되는 센스 앰프 트랜지스터와, 센스 앰프 트랜지스터를 구동하는 센스 앰프 드라이버 트랜지스터를 갖는 반도체 기억 장치에 있어서, 센스 앰프 트랜지스터 및 센스 앰프 드라이버 트랜지스터는 반도체 기판 표면에 형성된 공통의 확산층 영역을 2등분하는 게이트 전극을 각각 가지며, 이들의 게이트 전극은 확산층 영역의 경계상에 배치되어 있는 것을 특징으로 한다.
Patent KR-20040073105-A (KR)
Title: Deflection yoke
Inventor: LIM CHANG JU
IPC: H01J29/76
Filed: 2003-02-13
Abstract: PURPOSE: A deflection yoke is provided to shield a leakage magnetic field generated at a deflection yoke by changing a shape of a horizontal deflection coil. CONSTITUTION: A deflection yoke comprises a coil separator including a screen, a rear cover, and a neck part; a horizontal(15) and vertical deflection coils including a screen bent unit, an extension unit, and a neck bent unit and mounted at the inner circumference and the outer circumference of the coil separator, respectively; a ferrite core mounted at the outer circumference of the coil separator for enhancing deflection magnetic field; and a cross sub bent unit for shielding VLMF magnetic field leaked by the deflection coils.
Patent KR-20040084481-A (KR)
Inventor: JUNG JI YONG
IPC: G02F1/1333
Filed: 2003-03-28
Abstract: PURPOSE: A liquid crystal display is provided to prevent alien substances from flowing into a space between a first substrate and a second substrate, and protect one ends of the first substrate and the second substrate from a shock applied from the outside. CONSTITUTION: A first substrate(100) is opposite to a second substrate(200). Liquid crystal, a combining member(350), and an alien substance preventing member(370) are injected between the first substrate and the second substrate. The combining member combines the first substrate with the second substrate, having an injection port(351) at one side for injecting the liquid crystal. The alien substance preventing member covers one ends of the first substrate and the second substrate for preventing alien substances from flowing into a space between the first substrate and the second substrate.
Patent KR-20040088955-A (KR)
Inventor: PARK SEONG MIN
IPC: G11B7/09
Filed: 2003-04-14
Abstract: PURPOSE: A device for controlling a pickup skew of a disk drive is provided to control a height of guide bars of a pickup device by a controller rotatively coupled with a body base. CONSTITUTION: A pickup device(20) is installed on a body base(1) along one pair of guide bars(21). A skew is controlled by a controller(30) in a section of the guide bars(21). The controller(30) is rotatively coupled with the body base(1). The section of the guide bars(21) is contacted with an inclined cam surface formed in the middle of the controller(30). The controller(30) is rotatively coupled with the body base(1) by forming an axial hole in a top middle part, and is formed with the inclined cam surface, then is formed with plural protruded ribs.
Patent KR-20030084626-A (KR)
Title: 플라즈마 디스플레이 패널의 구동 방법 및 플라즈마디스플레이 장치
IPC: H01J17/49
Filed: 2003-04-19
Abstract: 배경 휘도를 저감할 수 있는 PDP의 구동 방법의 실현한다.  본 발명은 복수의 표시 전극(2, 3)과, 복수의 어드레스 전극(4)을 구비하고, 교차부에 표시 셀(5)이 형성되는 PDP의 구동 방법으로서, 표시 셀에 소정의 전하량이 축적되도록 초기화하는 초기화 기간 TR와, 어드레스 방전을 발생시켜서 각 표시 셀을 표시 데이터에 따른 상태로 하는 어드레스 기간 TA와, 전극쌍에 전하 형성 펄스를 인가하는 전하 형성 기간 TM과, 교대로 역극성의 유지 방전 펄스를 인가하여 유지 방전 발광을 행하는 유지 방전 기간 TS를 구비하고, 초기화 기간은, 기입 기간 TR1과, 축적된 전하량을 조정하는 전하 조정 기간 TR2를 구비하며, 전하 조정 기간 TR2에 전극쌍에 인가되는 전압은, 경사파 형상의 파형을 갖는 전하 조정 펄스이고, 전하 형성 펄스의 전압의 절대값은 유지 방전 펄스의 전압의 절대값보다 크다.
Patent KR-20040091958-A (KR)
Inventor: KIM JAE UNG
IPC: H01L21/20
Filed: 2003-04-23
Abstract: PURPOSE: A method of forming a multilayer thin film and an apparatus for performing the same are provided to form uniformly a gate oxide layer having a thickness of less than 15 angstrom on a substrate by using in-situ process. CONSTITUTION: A semiconductor substrate is loaded in a reaction chamber(S10). A silicon atomic layer is formed on the substrate by flowing the first reaction gas containing silicon into the chamber(S12). The remaining first reaction gas is removed from the chamber by using the first purge gas(S14). The silicon atomic layer is transformed into a silicon oxide atomic layer by flowing the second reaction gas containing oxygen into the chamber(S16). The remaining second reaction gas is removed from the chamber by using the second purge gas(S18). A silicon oxide layer having a desired thickness is formed by performing repeatedly the steps. A gate electrode layer is formed on the silicon oxide layer by using in-situ process(S22).
Patent KR-20040095945-A (KR)
Inventor: KIM JIN GWAN
IPC: H01L21/336
Filed: 2003-04-29
Abstract: PURPOSE: A method for manufacturing semiconductor device is provided to prevent OED(Oxidation Enhanced Diffusion) during the implantation process for forming a high-density source/drain region, thereby forming the source/drain region in a substrate shallowly by forming a first buffer layer consisting of a silicon nitride layer before forming the high-density source/drain region and then, forming a second buffer layer consisting of a silicon oxide layer. CONSTITUTION: A gate electrode(14) is formed on a silicon substrate(10). A spacer(18) is formed at both sidewalls of the gate electrode. A buffer nitride layer(19) is formed on the resultant substrate. A buffer oxide layer(20) is formed on the buffer nitride layer. A source and drain regions(21a,21b) are formed in the silicon substrate.