• 한국전기전자재료학회논문지
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• 제19권7호
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• pp.667-672
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• 2006

Ferroelectric $Pb(Zr_{0.52}Ti_{0.48})O_3$ (PZT(52/48)) thick films were fabricated by the screen-Printing method on the alumina substrates, and $PbTiO_3$ (PT) Precursor solution, which prepared by sol-gel method, was spin-coated on the PZT(52/48) thick films to obtain a densification. Its structural and electrical properties of the PZT(52/48) thick films with the treatment of PT precursor solution coating were investigated. The particle size of the thick films was increased with increasing the number of coatings and the thickness of the PZT-6 (6: number of coatings) films was about $60{\mu}m$. The relative dielectric constant increased and the dielectric loss decreased with increasing the number of PT sol coatings. The relative dielectric constant and dielectric loss of the PZT-6 thick film were 475 and 2 %, respectively. The remanent polarization, coercive field and breakdown strength of the PZT-6 film were $32.6{\mu}C/cm^2$, 15 kV/cm and 60 kV/cm, respectively.

• 한국인쇄학회지
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• 제29권2호
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• pp.71-82
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• 2011

Electronic display markets has been developed. The cathode ray tube of brown form recently celebrated their 100th by first display. Also LCD of flat form recently celebrated their 25th by second display and it has advantage of small volume, lower consumption power. But FPD has problem that is property of brittle and noncarrying by glass substrate. Therefore the arrival of portable electronics devices has put an increasing premium on durable, lightweight and inexpensive display components. It is flexible display by third display. Also electronics field such as printed wiring board, RFID, membrane switch prefer flexible display. The conductive pattern can be used mostly in field of electronic displays and electronics. This manufacture of conductive pattern in present used is screen printing. The the conductive pattern. It has advantages of flexibility, high conductivity, drying in low temperature, good conductivity. screen printing has problem that is low productivity and use not flexible substrate because of high fire temperature. This study was developed novel method to form the conductive pattern. It has advantages of flexibility, high conductivity, drying in low temperature, good conductivity.

• 융합보안논문지
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• 제14권2호
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• pp.3-9
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• 2014

VOD 서비스는 디지털케이블과 IPTV의 가입자 수가 증가하면서 방송사업자들의 주요 수익모델로 자리 잡고 있으며 방송사업자, 통신사업자, 단말기 제조사들이 추진하고 있는 N-스크린 서비스의 핵심 전략으로 부상하고 있다. 이런 배경 속에 디지털방송 사업자들은 자신의 VOD 서비스를 더욱 활성화하기 위해 사용자의 만족도가 높은 VOD 모바일 서비스 제공에 노력하고 있다. 본 논문은 N-스크린 전략을 통해 VOD 서비스를 활성화 하고자 하는 국내 모(某) 디지털 케이블 방송사업자의 요구사항을 기반으로 개발된 VOD 모바일 앱을 소개한다. 본 VOD 모바일 앱은 방송사업자가 발간하는 VOD 가이드북과 연계된 프로모션 기능, 찜하거나 검색한 VOD 프로그램을 TV로 바로 시청할 수 있는 기능, 스마트폰으로 촬영한 동영상을 TV로 시청할 수 있는 기능 등을 제공한다.

• 디지털콘텐츠학회 논문지
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• 제15권3호
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• pp.339-346
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• 2014

VOD 서비스는 디지털방송 시대에 방송사업자의 새로운 수익모델로 자리 잡은 가장 성공적인 방송통신융합 서비스로서 실시간 중심의 시청 패턴에서 주문형 동영상의 이용 비중이 확대됨에 따라 매출액이 증가 추세에 있으며 N-스크린 서비스의 전략 핵심이 되고 있다. 이런 배경 속에 방송사는 모바일 기기를 활용한 VOD 서비스 지원 기능을 제공하여 VOD 서비스를 더욱 활성화하는 VOD 서비스의 N-스크린 전략을 모색하고 있다. 본 논문은 국내 모(某) 디지털케이블방송사의 요구사항을 기반으로 개발된 VOD 모바일 앱을 소개한다. 본 VOD 모바일 앱은 방송사가 발간하는 VOD 가이드북에 홍보하는 VOD 프로그램 또는 이벤트 정보를 출력, 북마킹 또는 검색된 VOD 프로그램을 TV로 바로 시청, 스마트폰으로 촬영한 동영상을 TV로 시청하는 등의 기능들을 제공한다.

• 센서학회지
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• 제19권2호
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• pp.149-154
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• 2010

Top of the alumina body which is made according to plan has been printed using a screen printer equipment in order to print an electrode pattern. The electrode is connected with the quartz crystal oscillator of the piezoelectricity method which has a piezoelectric characteristic. The pressure contact department has been experimented using three type of the teflon. The teflon is good for pressure delivery vector but it is bad restitution. So we devised the structure which inserts the metal in the teflon. Bottom of the module is connected with the signal processing department which is planned in advance and then has investigated to characteristic. Therefore we have got the best output-voltage and frequency characteristic follows in the pressure.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 추계학술대회 논문집 전기물성,응용부문
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• pp.71-73
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• 2005

Ferroelectric PZT heterolayered thick films were fabricated by the alkoxide-based sol-gel method. PZT(20/80) and PZT(80/20) paste were made and alternately screen-printed on the alumina substrates. The coating and drying procedure was repeated 4 times to form the heterolayered thick films. The thickness of the PZT heterolayered thick films was approximately 60 mm. All PZT thick films showed the typical XRD patterns of a perovskite polycrystalline structure. The relative dielectric constant and the dielectric loss of the PZT thick films sintered at $1050^{\circ}C$ were 1382 and 1.90%, respectively. The remanent polarization and coercive field of the PZT thick films sintered at $1050^{\circ}C$ were $14.15{\mu}C/cm^2$ and 19.13kV/cm, respectively.

• 한국초전도ㆍ저온공학회논문지
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• 제1권1호
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• pp.7-14
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• 1999

Wekk oriented $Bi_{2} Sr_{2} CaCu_{2} O_{8}$ suppercondcting thick films were fabricared on copper tape by LiReac-PreCu (liquid reaction between a Cu-free precousor and Cu tape) method. Cu-free precursor power which is composed of $Bi_{2}Sr_{2}Ca_{5}$ was printed on a copper tape by screen printing and was heat-treated. The speciment were partially in a molten state at the heat treatment temperature (85$0^{\circ}C$~87$0^{\circ}C$). The heat heat treatments for the reaction were performed in air or low oxygen pressure in several stages. XRD analyses of the resulting Bi2Sr2CaCu2O8 superconducting tapes show that the $Bi_{2} Sr_{2} CaCu_{2} O_{8}$ phase is dominant and a small amount of $Bi_{2} Sr_{2} Cu_{2} O_{6}$ phase is detected. Both phases are aligned in the c-axis direction.

• 한국전기전자재료학회논문지
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• 제11권12호
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• pp.1139-1145
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• 1998

In this paper, to fabricate a superconducting fault current limiter(FCL) of thick film type, $YBa_2Cu_3O_X superconducting thick films were fabricated by surface diffusion process using the screen printing method. Powder mixture of $3BaCuO_2$+2CuO was screen printed on $Y_2BaCuO_5$(d=15mm). And critical current densities of the thick films were observed as the sintering temperature(92$0^{\circ}C$~95$0^{\circ}C$) and holding time(2h~10h). Based on experimental data, the thick films for superconducting FCL were sintered at $940^{\circ}C$ in 2 hours. The superconducting FCL with a current limiting area of 1mm wide and 66mm long was prepared on $Y_2BaCuO_5$ substrate. To measure the characterization of the fabricated FCL, an alternating voltage (60Hz) was applied to the FCL in 77K liquid nitrogen. At an applied voltage of 4V, the FCL was limited from 20A into 0.6A not farther than 0.5ms.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2013년도 제45회 하계 정기학술대회 초록집
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• pp.313.1-313.1
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• 2013

현재 결정질 실리콘 태양전지의 전 후면 전극의 형성은 스크린 프린팅 방법이 주를 이루고 있다. 스크린 프린팅 방법은 쉽고 빠르게 인쇄가 가능한 반면 단가가 높고 금속 페이스트에 첨가된 여러 혼합물에 의해서 전극과 기판 사이의 저항이 크다는 단점이 있다. 본 논문에서는 스크린 프린팅 방법으로 태양전지의 seed layer를 인쇄하고, Cu도금을 진행함으로써 태양전지의 전기적 특성을 비교하였다. 주요 전극 형성을 Cu 도금을 사용함으로써 전극과 기판사이의 저항을 감소시키고 값비싼 Ag페이스트를 값싼 Cu로 대체함으로써 가격을 낮출 수 있는 장점이 있다. 실험에 사용된 Si 웨이퍼 특성은 $156{\times}156$ mm2, 200 ${\mu}m$, 0.5-3.0 ${\Omega}{\cdot}cm$ and p-type 웨이퍼를 사용하였다. 웨이퍼는 표면조직화, p-n접합 형성, 반사방지막 코팅을 하였으며 스크린 프린팅 방법을 이용해 전 후면 전극을 인쇄하고 열처리 과정을 통해 전극을 형성하였다. 이 후 전면에 Cu도금을 실행하여 태양전지를 완성하였다. 완성된 태양전지는 솔라 시뮬레이터 및 TLM패턴을 이용하여 전기적 특성을 분석하였으며, SEM과 linescan, 광학현미경 등을 이용하여 전극을 분석하였다.

• 한국재료학회지
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• 제18권1호
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• pp.12-17
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• 2008

Carbon nanotube (CNT) cathodes were fabricated using nano-sized silver (Ag) powders as a bonding material between the CNTs and cathode electrodes. The effects of the powder size on the sintering behavior, the current density and emission image for CNT cathodes were investigated. As the diameter of the Ag powders decreases to 10 nm, the sintering temperature of the CNT cathode was lowered primarily due to the higher specific surface area of the Ag powders. In this study, it was demonstrated that nano-sized Ag powders can be feasibly used as a bonding material for a screen-printed CNT cathode, yielding a high current density and a uniform emission image.