baber/WOPTO huggingface dataset:
Patent KR-20000010134-A (KR)
Title: Method for manufacturing semiconductor apparatus
Inventor: KIM JOO WAN
IPC: H01L21/283
Filed: 1998-07-30
Abstract: PURPOSE: A method for manufacturing a semiconductor apparatus is provided to improve gap-fill and flatness characteristics of the semiconductor apparatus. CONSTITUTION: According to the manufacturing method, a metal film pattern(104) is formed on a semiconductor substrate(100) where a layer insulation film(102) is formed. A first insulation film(106) is formed on the metal film pattern(104). Thickness of the first insulation film(106) is reduced by a gas etching, so that area of the first insulation film(106) is enlarged. A second insulation film(108) is formed on the first insulation film(106). Here, the evaporation and etching processes for the first and second insulation films(106, 108) are performed by an in-situ method. Thereby, the gap-fill and flatness characteristics of the semiconductor apparatus can be improved.
Patent KR-20000013120-A (KR)
Title: Manufacturing method of semiconductor device
Inventor: PAE CHONG IN
IPC: H01L21/027
Filed: 1998-08-04
Abstract: PURPOSE: A manufacturing method of semiconductor device is provided to minimize the reflection rate of ARC (Anti Reflecting Coating) film, a reflection-preventive film against an exposed source of light and improve the homogeneity of a pattern, by optimizing the thickness of the ARC film while manufacturing a semiconductor device which uses DUV (Deep Ultra Violet). CONSTITUTION: The method comprises the steps of: forming a SiON (Silicon Oxy-Nitride) film, a reflection preventive film, to be 950¯1150 Angstrom thick, on a semiconductor substrate in which a down thin film has been formed; minimizing the reflection rate against a source of light in case of exposure and making the improvement of a pattern homogeneity possible; forming a photo register for DUV on the SiON film; aligning a given photo mask on the photoresist for DUV; exposing the DUV with a source of light; and developing the exposed photoresist to form a photoresist pattern.
Patent KR-20000013518-A (KR)
Title: Solid catalyst for oxidation reaction and manufacturing method thereof
Inventor: LEE YOUNG GIL
IPC: B01J23/74
Filed: 1998-08-10
Abstract: PURPOSE: A solid catalyst is provided to suppress the use of an expensive bismuth as much as possible and at the same time to have a high activation, having an excellent activation of a catalyst. CONSTITUTION: A complex oxidation material is comprised of the steps of: dissolving salt including an A and Q element or a chemical compound in at least more than one kind of a solvent and impregnating on a core part; drying the impregnated material at the temperature of 50 to 200°C and burning it again at the temperature of 200 to 700°C. The catalyst has the formula of (BinAaQOx) ((100-z)%FefNigMomOy + z%SiO2). Herein, A is more than one kind element selected among boron, phosphorus and molybdenum and Q is among an element having a 3 to 6 atomic value. When m is 1, n is 0.001 to 3, a is 0.001 to 3, q is 0.001 to 3, f is 0.01 to 5, g is 0.1 to 5 and z is 0 to 90. Lastly, x and y are decided to match an atomic value by other element between a core part and a shell.
Patent KR-20000014681-A (KR)
Title: Magnetic driving device for sputtering apparatus
Inventor: KIM SANG JIN
IPC: C23C14/35
Filed: 1998-08-24
Abstract: PURPOSE: A magnetic driving device for sputtering apparatus is provided which brings a uniform erosion of the sputtering target for the substrate of good quality coating by preventing the concentration of plasma generation. CONSTITUTION: A belt conveyer system having two rotary shaft pulleys in parallel and an endless belt larger in width and length than the target is provided on the back side of the target to carry magnets each having different poles for the top and the bottom and being in a shape of plastic bar arranged in parallel to the belt pulley shafts in a regular spacing and alternatively sided with another bar shape magnets each having poles oppositely formed and linked at both ends in a shape of eclipse housing and plastic bar magnet. The belt moves at a slow steady speed to distribute magnetic flux evenly and being uniform sputtering.
Patent KR-20000015282-A (KR)
Title: Speed control device of electromotive forklift and method thereof
Inventor: HAN SUK GYU
IPC: B66F9/24
Filed: 1998-08-28
Abstract: PURPOSE: A speed control device of an electromotive forklift is provided to limit the maximum speed under the specific speed according to the working site condition so as to normally pass through an uphill road or the unevenness part of a road that doesn't pass with a limit specific speed, by increasing duty ratio corresponding to the limit specific speed. CONSTITUTION: The speed control device comprises:a current detecting unit(130) sensing current that flows in a traveling motor(54); a current setting unit(140) setting an optional standard current value that flows in the traveling motor and makes an electromotive forklift travel in a normal road condition such as a flat road; and a control unit(60) outputting to a transistor(52) by judging if the detected current value is over the set current value and if so, increasing duty ratio corresponding to the limited limit speed after comparing the current value in the traveling motor that is detected from the current detecting unit with the standard current value that is set from the current setting unit in a state of setting the limit speed of the electromotive forklift by a maximum speed setting unit(110).
Patent KR-20000019295-A (KR)
Title: Method for inter-diffusing of multi-quantum wells
Inventor: LEE JEONG SEOK
IPC: H01L21/22
Filed: 1998-09-10
Abstract: PURPOSE: An inter diffusion method of MQW(multi-quantum well) is provided to enable selective inter-diffusion of nano-scale and achieve a qualify inter-diffusion interface by irradiating focused laser beam using a condensing lens. CONSTITUTION: An inter-diffusion method comprises the steps of forming a SiO2 layer(2)having a thickness of lambda/4 on an MQW layer(1); and performing an inter-diffusion by the laser beam of lambda/4 to the MQW layer(1), wherein the inter-diffusion step further includes the sub-step of focusing the radiated laser beam using a condensing lens(4). Using the laser beam of low power, it is possible to enable selective inter-diffusion of nano-scale and qualify inter-diffusion interface.
Patent KR-19990030081-A (KR)
Title: 공간 효율적 ｍｄｑ 스위치 배치
IPC: H01L27/108
Filed: 1998-09-24
Abstract: 로우 및 칼럼으로 배열된 다수의 메모리 셀을 갖는 반도체 메모리는 로우에 평행한 길이를 갖는 제 1의 일반적 직사각형 영역에 배치된 센스 증폭기 뱅크를 포함하며, 여기서 뱅크 내의 각 센스 증폭기는 관련 칼럼의 한 쌍의 상보 비트라인 사이 센스 증폭기 영역에 배치된다.  MDQ 스위치는 적어도 하나의 드라이버에 상응하는 로우방향 공간을 할당하는 센스 증폭기 영역에 위치되어, 그것의 공간 효율적 배치를 제공한다.
Patent KR-20000024850-A (KR)
Title: Thin film transistor and manufacturing method thereof
Inventor: HA YONG MIN
IPC: H01L21/77
Filed: 1998-10-02
Abstract: PURPOSE: A thin film transistor and manufacturing method thereof is provided to decrease a process badness by equaling a thickness a source region or a drain region to a source electrode or an insulating film located on an upper portion of an active region and an insulating film located on an upper portion of the source electrode and a drain electrode. CONSTITUTION: Source electrodes(50S,50'S) and drain electrodes(50D,50'D) are formed on an insulating substrate(500). A pattern etched layer insulating film(52) is formed to a certain region. An active layer(53) having a source region(563S), a channel region(53C), and a drain region(53D) is formed on the layer insulating film(52). A gate insulating film(54) is covered to an exposed front surface of a substrate having a source electrode(50S), a drain electrode(50D), and the active layer(53). A gate electrode(55) is formed on the gate insulating film(54) formed on an upper portion of the channel region(53C). A protecting film(56) is covered to an exposed front surface of the substrate having the gate electrode(55). A contact hole is formed to the gate insulating film(54).
Patent KR-20000026338-A (KR)
Title: Method for controlling bus of micro controller having arm cpu
Inventor: SEO UN SIK
IPC: G06F13/00
Filed: 1998-10-20
Abstract: PURPOSE: A method for controlling bus of micro controller having ARM CPU is provided to minimize a power consumption when controlling a bus by not generating in the case that an active region is overlapped in all buses and controlling an operation of a selected slave device. CONSTITUTION: First and second master devices(12,14) control slave devices such as a memory device and perform a specific function. First and second slave devices(18,20) respond to a request of first and second master devices(12,14) and write/read data. A bus controller(16) controls the first to third bus lines(22,24,26) connected to among an ARM CPU(10), first and second master devices(12,14), and first and second slave devices(18,20).
Patent KR-19990014369-A (KR)
Title: 필터프레스
Filed: 1998-11-03
Abstract: 본 발명은 각종 산업현장에서 발생되는 탈수용 슬러지를 효과적으로 가압, 탈수시켜 제조된 케익 형태의 슬러지를 여과판으로 부터 원활하게 분리, 제거시킨후 여과판을 간단한 이송장치를 이용하여 이송가능하도록 발명한 필터프레스에 관한 것으로 설치 및 유지, 보수, 수리가 용이하면서 최적의 가압, 탈수 효과를 얻을 수 있으며, 제작원가 또한 저렴한 효과가 있는 것이다.
Patent KR-20000032148-A (KR)
Title: Method of self-diagnosis of circulating pump of gas boiler using lead switch
Inventor: BAEK SEONG HAK
IPC: F24H1/00
Filed: 1998-11-13
Abstract: PURPOSE: A self-diagnosis method of a circulating pump of a gas boiler using a lead switch is provided to detect the stoppage of a circulating pump via a lead switch having the contact point opened and closed according to the movement of a ball moving upward a downward by a water current when supplying hot water and heating water and to inform a user of the stoppage. CONSTITUTION: A circulating pump rotates right and reverse according to the set operation mode if a gas boiler is driven. The contacting state of a lead switch installed on an inlet of a circulating pump housing having the contact point opened and closed by the ball moving up and down according to the right and reverse rotation of the driven circulating pump is affirmed. If the lead switch is kept in off state in a heating mode, or the lead switch is kept in on state in a hot water supply mode, an error message is displayed.
Patent KR-20000032558-A (KR)
Title: Apparatus of recognizing network device
Inventor: KIM BOUNG ROUL
IPC: H04L12/28
Filed: 1998-11-16
Abstract: PURPOSE: An apparatus of recognizing network device is provided to prevent mis judgement for users on using network by checking whether a port replicator is accessed or not in network system where a Media Access Controller(MAC) and Physical Layer(PHY) are separated and provide correct data whether each user uses or not by checking the exist of MAC and PHY. CONSTITUTION: An apparatus of recognizing network devices of the present invention includes a port replicator(20) for both performing connection control operation between a system and peripheral devices and setting, maintaining and releasing the physical link to control an analog part of the network system, and output a first access control signal when accessed to the system. A system controller(10) both outputs a second access control signal for checking control process of digital part of the network system and driving the system and drives the system according to the checked result. A controller(15) generates a user control signal for confirming on/off condition of the network after receiving the first and second access control signals.
Patent KR-20000033970-A (KR)
Title: Remote power control apparatus
Inventor: LEE SANG TAE
IPC: H04Q9/00
Filed: 1998-11-26
Abstract: PURPOSE: A remote power control apparatus is provided to control on/off remote and to reduce electric consumption to the most, by applying a remote receiving part which controls power by a radio signal of a remote controller to lamps, electric home appliances, watches, and so forth. CONSTITUTION: If a key for controlling power is inputted by a user, a remote controller(10) converts a key signal into a radio signal. A receiving part(20) installed in a desired location of a connector(40) receives the input from the remote controller(10), and supplies or breaks power to a socket(30). The socket(30) mounted on the wall supplies or breaks external power to a lamp(50), according to an on/off switching signal transmitted from the receiving part(20). The connector(40) comprises the receiving part(20) to receive the infrared or radio frequency signal output from the remote controller(10).
Patent KR-20000037731-A (KR)
Title: Method for generating triangle meshes of two-dimensional data using wavelet coefficients
Inventor: NA JONG BEOM
IPC: G06F17/10
Filed: 1998-12-02
Abstract: PURPOSE: A method for generating triangle meshes of two-dimensional data is provided to generate the triangle meshes at a high speed without calculating another complexity, by deciding data local characteristics, that is, the complexity with Wavelet transform coefficients to divide lattices, and by storing Wavelet-transformed data. CONSTITUTION: A method for modeling meshes for visualizing two-dimensional data to three-dimensional data, comprises the steps of: directly using Wavelet transform coefficients to input two-dimensional formal lattice data, and performing a Wavelet transform process; detecting a position of a Wavelet transform coefficient(important Wavelet transform coefficient) which is bigger than a given threshold value; performing a square lattice division according to the Wavelet transform coefficient position, and generating a quadtree; and changing the generated quadtree into triangle meshes.
Patent KR-19990024101-A (KR)
Title: 페리메타 공조시스템을 합성한 에너지 절약적 외피시스템
Filed: 1998-12-04
Abstract: 본 발명은 페리메타 공조시스템을 합성한 에너지 절약적 외피시스템을 개발에 관한 것으로서, 더욱 상세하게는 종래의 건축물의 외피중 특히 창은 열적으로 취약한 부위이므로 공기조화 설비시스템의 설계시 창 밑부분에 Fan Coil Unit(이하 FCU)를 설치하여 열적으로 취약한 창면으로부터의 열손실을 줄이는 방안이 적용되어 오고 있다.    그러나 FCU방식은 실내에 FCU를 설치하므로 수배관이 필요하게 되고 이에 따른 결로, 미생물 번식 등의 문제와, 신선 외기를 공급하지 못함에 따른 실내공기질의  악화 현상을 발생시키고 있다. 
     이러한 문제점을 해결하기 위한 수법으로 일본, 유럽 등에서는 Airflow Window System(공기순환형 창)을 개발하였으나, 이 시스템은 초기투자비가 막대하며(회수기간법에 의한 경제성 분석결과 회수기간이 87년으로 나타남), 창부위의 구조체 중량화로 인하여 고층건축물에 도입이 곤란하다. 
     따라서 위 두 방식의 문제점을 해결하기 위하여 본 발명인 페리메타 공조시스템을 합성한 에너지 절약적 외피시스템은 기존의 외피구조를 거의 변형하지 않고 FCU대신에 저속덕트를 포함한 페리커버시스템을 사용함으로써 창으로부터 유출(또는 유입)되는 열손실(또는 열획득)을 대부분 상부 급기덕트 및 페리커버에 있는 저속덕트를 이용하여 제거함으로 창으로부터의 복사열이 완화되어 쾌적한 실내공간을 창출할 수 있다. 
     본 발명 시스템의 원리를 상세히 설명하면, 창으로부터 유출(또는 유입)되는 열손실(또는 열획득)을 막기위해, 기존의 FCU자리에 저속덕트를 포함한 페리커버시스템을 설치함으로써 여름철에는 천장으로부터 급기된 찬공기를 저속덕트로 흡입하여 창면으로부터 흡수된 일사열 등에 의한 고온의 공기를 제거시킬 수 있다.    또 겨울철에는 페리커버 하단에 설치된 댐퍼를 개방하여 실내 공기를 유입시켜 상부로 급기하고 천장면의 배기구를 통하여 배출시킴으로서 창주위의 찬 복사열을 제거시킴으로 실내부로부터의 열손실을 막을 수 있다.    중간기의 경우는 창면 하부에 설치된 환기창을 통하여 실내의 압력차에 의한 자연환기를 유도하여 실내공기질을 확보하는 동시에 기계환기 실시시 요구되는 에너지를 절감시킬 수 있는 특징이 있다. 
     본 발명의 효과는 쾌적한 실내환경 조성 효과, 에너지 절약 효과, 실내공기질의 개선 효과, ESC0사업을 통한 기존 건축물에 적용이 될 수 있는 효과 등이 있다.
Patent KR-20000038981-A (KR)
Title: Method and apparatus for decoding video cassette recorder
Inventor: LIM JIN SEOK
IPC: H04N19/625
Filed: 1998-12-10
Abstract: PURPOSE: A method and an apparatus for decoding a video cassette recorder are provided to constantly maintain the data transmitting rate regardless an input format by performing the down conversion according to the input format. CONSTITUTION: A decoding apparatus has a variable length decoder for outputting codes corresponding to DCT coefficient by decoding the codes. An inverse quantizer(202) performs a down conversion according to the DCT coefficient and the input format. The DCT coefficient is output by a buffer portion(204). The buffer portion(204) is controlled by a buffer controller(403). The buffer portion(204) carries out a double buffering according to the input format. The decoding apparatus also has a DCT section for transforming the DCT coefficient output from the buffer portion(204).
Patent KR-20000039551-A (KR)
Title: System for measuring offset between cam and tappet
Inventor: SHIN MIN SIK
IPC: G01B5/20
Filed: 1998-12-14
Abstract: PURPOSE: A system for measuring an offset between a cam and a tappet is provided to improve the accuracy of the measurement by using two slide assembly blocks that closes contact the cam and the tappet. CONSTITUTION: A system for measuring an offset between a cam and a tappet comprises an upper block(13) having a scale(10) contacting the cam and a step(11) and being slidable using a slide projection(12) disposed in a longitudinal direction and a lower block(16) having a V-shaped groove(14) contacting the tappet and a slide groove(15) for receiving the slide projection(12). The lower block(16) is assembled with the upper block(13). The slide projection(12) and the slide groove(15) are designed to have a rectangular or a triangular shape.
Patent KR-19990024154-A (KR)
Title: 심야전기를 이용한 냉난방 장치
Filed: 1998-12-11
Abstract: 본 발명은 심야 전기를 이용한 냉난방 장치에 관한 것이다. 
     종래에도 심야 전기를 이용한 난방기와 냉풍기가 있기는 하였으나 이는 심야에 한하여 사용할 수 있게 하였을 뿐만아니라 난방기와 냉풍기를 각각 마련해야 하는 결점과 심야가 아닐때는 일반 전기를 사용하고 있는 관계로 전기요금의 과부담이 있었던 것이다. 
     본 발명은 이상의 문제점을 해결하고자 발명한 것으로 이의 발명 요지는 비교적 대형인 저장수조(1)의 내부 하측에는 심야 전기와 연결된 히터(2)가 설치되어 경제적인 심야 전기로서 다량의 온수를 가열 저장할 수 있게 하고 상부에는 심야전기에 의해 가동되는 냉동기(10)와 연결된 열교환관(3)이 설치되어  값싼 심야 전기로서 다량의 냉각수를 저장할 수 있게 하며 그 중심부에 설치된 배출관(4)의 외부 상측에는 밸브(8)를 개재한 냉풍기(7)의 배출관(7')이 연결되어 여름철에는 냉풍기로서 실내를 냉각할 수 있게 하고 그 전방에는 저장수조(1)의 하측에 연결된 유입관(6)과 밸브(9')를 개재시킨 난방관(5)이 연결되어 겨울철에는 심야전기로서 가열된 온수로서 난방할 수 있게 하며 유입관(6)의 상부에는 밸브(9)를 개재시켜 냉풍기(7)의 유입관(7)이 연결되어지게 하여 냉각수위 순환을 가능케 하며 저장수조(1)내의 물이 감소되면 이때에는 급수관(12)과 연결된 보충수조(11)에서 보충할 수 있게 한 것이다.
Patent KR-20000041991-A (KR)
Title: Polycarbonate-based thermoplastic resin composition having flame retardancy
Inventor: SHIN JUN HYEOK
IPC: C08K5/521
Filed: 1998-12-24
Abstract: PURPOSE: A polycarbonate-based thermoplastic resin composition is provided which does not generate silver in the exterior and has excellent heat resistance and flame retardancy. CONSTITUTION: A polycarbonate-based thermoplastic resin composition comprises (A) 45 - 95 % by weight of a thermoplastic polycarbonate resin containing no halogen, (B) 5 - 50 % by weight of a grafted copolymer resin having a rubber-modified styrene containing no halogen, (C) 0 - 30 % by weight of a copolymer resin having styrene containing no halogen, (D) a phosphate ester compound, (E) magnesium hydroxide, and (F) a fluorinated polyolefin-based resin, wherein, with respect to 100 % by weight of (A) + (B) + (C), (D) + (E) is 2 - 20 % by weight and (F) is 0 - 2 % by weight, and in (D) + (E), the ratio of (D) to (E) ranges from 50 : 50 to 90 : 10.
Patent KR-20000043778-A (KR)
Title: Two-phase stainless steel available for heat-substituted welding
Inventor: LEE YONG HEON
IPC: C22C38/44
Filed: 1998-12-29
Abstract: PURPOSE: Two-phase stainless steel is provided to enhance corrosion resistance by consisting of austenite and ferrite used in a ship for carrying chemicals and chemical equipment. CONSTITUTION: Two-phase stainless steel consists of, by weight %: not more than 0.03% of C, not more than 1.0% of Si, not more than 2% of Mn, not more than 0.04% of P, not more than 0.003% of S, not more than 2% of Cu, not more than 5-8% of Ni, 22-24% of Cr, 1.6-2% of Mo, 2-2.7% of W, 0.13-0.27% of N, Fe and incidental impurities. Herein, C stabilizes austenite and Mn has an advantage of increasing solubility of N. P reduces corrosion resistance and impact toughness, and S forms a sulfide as an element contained in scrap or alloy iron to reduce hot rolling. Finally, Cu prevents metal compounds from being formed and provides corrosion resistance excellent in acid under a reduction atmosphere.
Patent KR-20000045990-A (KR)
Title: Apparatus for controlling an inverter
Inventor: GI SANG WOO
IPC: H02M7/48
Filed: 1998-12-31
Abstract: PURPOSE: An apparatus for controlling an inverter is provided to prevent the malfunction of a train even when at least one inverter is out of order by detecting the stoppage of the inverter. CONSTITUTION: An apparatus for controlling an inverter comprises an operation condition determining section(11), an inverter operation controlling section(12), an output voltage detecting section(13), and a protection operation determining section(14). The operation condition determining section(11) receives an operation signal and the operation state of an inverter(2), and outputs the operation signal to the inverter operation controlling section(12). The inverter operation controlling section(12) controls the operation of the inverter(2).
Patent KR-20000046065-A (KR)
Title: Vibration device for portable telephone
Inventor: KIM KI HYUN
IPC: H04B1/38
Filed: 1998-12-31
Abstract: PURPOSE: A vibration device for a portable telephone is provided so that battery power consumption can be minimized by using a piezoelectric ceramic. CONSTITUTION: In a vibration device for a portable telephone, a piezoelectric device(2) is installed at the upper and lower portions of an elastomer(1). Thereafter, a vibrator(1a) is disposed at one end of the elastomer(1). A base(3) is disposed at the opposite side of the vibrator(1a), for supporting the elastomer(1) and the piezoelectric device(2). At this time, a piezoelectric ceramic is used as the piezoelectric device(2). When a current is applied to the piezoelectric device(2) after fixing the piezoelectric device(2) to the upper and lower portions of the elastomer(1), vibration is vertically generated in the piezoelectric device(2). Such vibration is transmitted to the elastomer(1), and then transmitted to a main body of the portable telephone. Accordingly, the user is informed of the call reception. As a result, the vibration device for the portable telephone is embodied by using a special property of the piezoelectric device, thereby minimizing battery power consumption.
Patent KR-19990087682-A (KR)
Title: 눈의 광역학적 치료를 통한 시력 향상
IPC: A61K41/00
Filed: 1997-02-25
Abstract: 눈의 이상 질환, 특히 노화성 흑점 변성증 등의 바람직하지 못한 신혈관계로 특징지워지는 이상 질환의 광역학적 치료를 통해 치료 대상의 시력을 증진시킨다.
Patent KR-20000050274-A (KR)
Inventor: LEE CHI HUN
IPC: H01L27/04
Filed: 1999-01-02
Abstract: PURPOSE: A semiconductor device having multi-layer resistance is provided to increase a degree of integration of a chip by connecting an upper conductive layer of high resistance and a metal wire to obtain desired resistance, so that the length of a resistor element can be minimized. CONSTITUTION: In a semiconductor device having a resistor element, The resistor element comprises a lower conductive layer, an insulation layer, and an upper conductive layer. The lower conductive layer is formed on a semiconductor substrate(100). The insulation layer(116) is formed on the lower conductive layer. The upper conductive layer formed on the insulation layer, has a resistance value higher than the lower conductive layer.
Patent KR-19990072304-A (KR)
IPC: G11B7/24018
Filed: 1999-01-28
Abstract: Methods for forming a single-side-readable DVD (10') having graphical information (70') viewable from the DVD's frontside disc (20') are provided. A first, frontside disc (20') having a first (22a') and a second surface (22b'), with the second surface comprising program information and coated with a semi-reflective coating (24'), is bonded to a second, backside disc (30') having a third and a fourth surface. A first portion of the fourth surface (32b') comprises spillover program information (34') and a second portion of the fourth surface comprises graphical information (38'). The fourth surface is coated with a reflective coating (36'). During DVD formation, the frontside and backside discs are adhesively bonded back to back so that the second surface of the frontside disc faces the fourth surface of the backside disc. Because the frontside disc comprises a semi-reflective coating, the graphical information on the second portion of the fourth surface of the backside disc is viewable through the frontside disc. The graphical information does not affect the playability of the DVD. <IMAGE>