• 대한기계학회논문집B
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• 제37권9호
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• pp.873-877
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• 2013

잉크젯 기술은 가정용 프린터에서부터 제조 도구로 확대 되었다. 최근 인쇄전자 분야에서 고해상도 인쇄가 요구되고 있다. 기존의 잉크젯 인쇄 패터닝 방식을 향상 시키기 위해 전기수력학잉크젯 기술이 최근 주목을 받고 있는데 노즐 직경보다 작은 방울을 토출할 수 있고 넓은 점도 범위와 재료를 사용할 수 있기 때문이다. 본 논문에서는 미세 패터닝을 위한 EHD 프린팅 시스템이다. 요구 적출형 프린팅에 의해 다양한 패턴을 인쇄하고 벡터와 레스터 프린팅 알고리즘을 개발하였다. 내경이 $8{\mu}m$ 인 노즐을 이용하여 $7{\mu}m$ 이하의 미세 전도성 선폭을 EHD 방식을 통해 만들 수 있다.

• 한국정밀공학회지
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• 제29권3호
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• pp.295-301
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• 2012

The method for spraying of liquids through an electrical field has become a printing method since it can make very small droplet. For electro-hydrodynamic jet printing to become a reliable jetting tool, the jetting performance should be characterized with respect to various jetting conditions. To optimize jetting conditions, the jetting behavior should be measured. In this study, we present a visualization techniques to measure jetting behavior from electro-hydrodynamic (EHD) inkjet head. Unlike most previous method, we use the CCD camera to measure the jetting behavior. For this purpose, LED light is synchronized with jetting signal and sequential image was obtained by adjusting the delay time of the LED light. Finally, merits and demerits of using CCD camera were discussed to measure jetting image from EHD inkjet head.

• 대한기계학회논문집A
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• 제34권10호
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• pp.1537-1541
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• 2010

전자 인쇄 분야에 활용이 가능한 잉크젯 프린팅 시스템을 개발하였다. 목표한 위치에 정확하게 이미지를 패터닝 하기 위한 프린팅 시스템의 하드웨어 및 소프트웨어를 개발 하였다. 이를 위하여 패턴 카메라와 선택된 노즐 간의 거리를 구할 수 있는 소프트웨어 알고리즘을 개발하였다. 또한 AutoCAD 의 dxf 파일을 이용하여 XY 스테이지를 동시에 움직여서 프린팅할 수 있는 벡터 프린팅 방법을 개발하였다. 또 다른 프린팅 방법으로 비트맵 이미지를 이용하여 복잡한 이미지를 출력할 수 있는 래스터 프린팅 방법을 개발하였고, CAD 를 이용한 래스터 프린팅 방법과 그 때 생기는 기술적인 문제들을 기술하였다.

• Journal of Electrical Engineering and Technology
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• 제8권3호
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• pp.603-609
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• 2013

In this paper, we describe the analysis of inkjet-printed silver (Ag) patterns on epoxy-coated substrates according to several reliability evaluation test method guidelines for conventional printed circuit boards (PCB). To prepare patterns for the reliability analysis, various regular test patterns were created by Ag inkjet printing on flame retardant 4 (FR4) and polyimide (PI) substrates coated with epoxy for each test method. We coated the substrates with an epoxy primer layer to control the surface energy during printing of the patterns. The contact angle of the ink to the coated epoxy primer was $69^{\circ}$, and its surface energy was 18.6 $mJ/m^2$. Also, the substrate temperature was set at $70^{\circ}C$. We were able to obtain continuous line patterns by inkjet printing with a droplet spacing of $60{\mu}m$. The reliability evaluation tests included the dielectric withstanding voltage, adhesive strength, thermal shock, pressure cooker, bending, uniformity of line-width and spacing, and high-frequency transmission loss tests.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회A
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• pp.1947-1950
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• 2008

Printing technology is a very useful method in the several process of industrial fabrication due to noncontact and fast pattern generation. To make micro pattern, we investigate the electrostatic induced inkjet printer head for micro droplet generation and drop-on-demand jetting. In order to achieve the drop-on-demand micro droplet ejection by the electrostatic induced inkjet printer head, the pulsed DC voltage is supplied. In order to find optimal pulse conditions, we tested jetting performance for various bias and pulse voltages for drop-on-demand ejection. In this result, we have successful drop-on-demand operation and micro patterning. Therefore, our novel electrostatic induced inkjet head printing system will be applied industrial area comparing conventional printing technology.

• 한국고분자학회:학술대회논문집
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• 한국고분자학회 2006년도 IUPAC International Symposium on Advanced Polymers for Emerging Technologies
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• pp.171-171
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• 2006

In this presentation, we would like to report an inkjet printing method to produce 1 to 2 bit RFID tag working in the range of 6 to 28 MHz with or without transistors. The inkjet printing method especially for the formation of transistors, inductors, capacitors will be presented by the view of polymer chemistry. This presentation also includes the printing schemes for memory cell, ring oscillator, rectifier, antenna, and so forth for constructing RFID tag. I illustrate these strategies by describing recent my works on the formation of all SWNT-TFT and conducting polymer-silver nanocomposite inks that can be applied in the construction of electronic devices.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권1호
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• pp.467-470
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• 2007

Ultrafine Indium tin oxide (ITO) nanoparticle was successfully fabricated by low temperature synthetic method (LTSM). Mean size of ITO nanoparticle is 5 nm, and uniformly dispersed with (222) orientated cubic structure. Using the nanoparticle, ITO thin film with good optical and electrical properties was fabricated by inkjet printing.

• 한국재료학회지
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• 제30권11호
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• pp.627-635
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• 2020

3D printing technology is a processing technology in which 3D structures are formed by fabricating multiple 2D layers of materials based on 3D designed digital data and stacking them layer by layer. Although layers are stacked using inkjet printing to release various materials, it is still rare for research to successfully form a product as an additive manufacture of multi-materials. In this study, dispersion conditions are optimized by adding a dispersant to an acrylic monomer suitable for inkjet printing using Co₃O₄ and Al₂O₃. 3D structures having continuous composition composed of a different ceramic material are manufactured by printing using two UV curable ceramic inks whose optimization is advanced. After the heat treatment, the produced structure is checked for the formation and color of the desired crystals by comparing the crystalline analysis according to the characteristics of each part of the structure with ceramic pigments made by solid phase synthesis method.

• 한국분말재료학회지
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• 제18권4호
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• pp.322-326
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• 2011

Inkjet printing was successfully done using Cu nano powder ink after these Cu nano powders were dry-coated with 1-octanethiol for oxidation prevention. 1-octanethiol, which is Self-Assembled Multi-layers (SAMs), was coated approximately 10-nm thick on the surface of Cu nano powders. 1-Octanol, which has the same chain length as that for 1-octanethiol, was used as a solvent to make the ink for inkjet printing. As a result, the fabricated ink was dispersed for about 4 weeks, and after printing and heat treatment at $350^{\circ}C$ for 4 hours, the resistivity for the printed pattern was measured to be $1.15{\times}10^{-5}{\Omega}{\cdot}cm$.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2003년도 춘계학술대회
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• pp.1219-1225
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• 2003

According to the increase of lifetime and efficiency, the interest in the pLED has dramatically increased recently because pLED can be applied to large-size and flexible displays. The core process in the manufacture of pLED is the printing process of red, green and blue light emitting polymers (LEP), and inkjet printing method is one of the promising technology to print red, green and blue LEP on glass substrates. In this work, we developed a multi-head inkjet patterning system with 3 heads for each color. The developed inkjet patterning system is composed of the precise positioning system, head controller circuit, real-time ink drop evaluation system, maintenance system, and stable ink supply system. Finally, we investigated the stability and reliability of the system by printing red, green and blue LEP on the dummy substrate.