• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2002.07b
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• pp.826-829
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• 2002

$MoO_3$ thin films were deposited on electrode and heater screen-printed alumina substrates in en atmosphere by RF reactive sputtering. The deposition was performed at $300^{\circ}C$ with 350W of a forward power in an $Ar-O_2$ atmosphere. The working pressure was maintained at $3{\times}10^{-2}$mtorr and all deposited films were annealed at $500^{\circ}C$ for 5hours. The surface morphology of films was observed by using a SEM and crystalline phases were analyzed by XRD. The sensing properties were investigated in term of gas concentration under exposure of reducing gases such as $H_2$, $NH_3$ and CO.

• Journal of the Korean Institute of Telematics and Electronics A
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• v.28A no.11
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• pp.880-886
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• 1991

Multi-layered chip inductors were prepared with good magnetic properties by sintering Ni-Zn-Cu ferrites at a lower temperature. A slurry with 49.5mol%Fe$_{2}O_{3}$, 20.5mol% ZnO, 20mol% NiO and 10nol% CuO was cast into tapes with 60-100\ulcorner of thickness with a doctor blade techniques. The tapes were screen-pronted with 100% silver electrodes, layered and pressed at 250kg/cm$^{2}$ and then sintered ant 900$^{\circ}C$ for 2h. Inductance with internal electrodes printed 5, 10, and 15 turns showed 4.9, 15 and 24$\mu$, respectively, at 1MHz.

• 한국생물공학회:학술대회논문집
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• 2000.11a
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• pp.206-207
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• 2000

A disposable, electro-chemiluminescent immunosensor utilizing a screen-printed carbon electrode and liposome coupled to antibody as tracer has been constructed. In proportion to the analyte (Legionella species as a model) concentration, the analyte-immunoliposome complexes were transferred by the capillary action through a membrane strip to the electrode, the liposomes were lysed in the presence of detergent, and ruthenium was released for signal generation. Such performance of the immunosensor was appropriate for a point-of-care testing.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2003.07b
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• pp.884-887
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• 2003

Strain gages were widely used transducers. Essentially a strain gage was an electric element to which an appropriate type was attached. Strain was sensed by gages and provided electrical output proportional to applied forced. This paper describes the recent development of a thick film strain gage ceramic pressure sensors. The thick film resistors as strain gage in the Wheatstone bridge were fabricated with a novel mixture of ruthenium. The thick-film technology of resistors were printed on the ceramic diaphragm back side by screen printing and cured at $850^{\circ}C$. The mechanical measurements were performed with the computer simulation results(ANSYS 5.1). The output sensitivity was 1.2mV/V, of which max. nonlinearity was less than 0.29%, hysteresis was less than 0.38%FS.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.12 no.5
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• pp.30-35
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• 2013

In order to increase cell efficiency in crystalline silicon solar cell, reduction of light reflection is one of the essential problem. Until now silicon wafer was textured by wet etching process which has random patterns along crystal orientation. In this study, high aspect ratio patterns are manufactured by nano imprint process and reflectance could be minimized under 1%. After that, screen printed solar cell was fabricated on the textured wafer and I-V characteristics was measured by solar simulator. Consequently cell efficiency of solar cell fabricated using the wafer textured by nano imprint process increased 1.15% than reference solar cell textured by wet etching. Internal quantum efficiency was increased in the range of IR wave length but decreased in the UV wavelength. In spite of improved result, optimization between nano imprinted pattern and solar cell process should be followed.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1395-1396
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• 2008

본 논문에서는 초소형 DC-DC 컨버터에 쓰이는 파워인덕터를 설계하였다. 제안된 인덕터는 Ni-Zn 페라이트와 Polyimide 혼합물질을 이용하여, 경화온도를 낮추어 유기기판(FR-4)에서도 적용될 수 있는 인덕터를 설계했다. 인덕터의 크기는 $5mm{\times}4.5mm{\times}0.5mm$ 이고, 도선의 물질은 구리(Cu)를 사용하였으며, 18${\mu}m$의 두께, 85${\mu}m$의 선폭, 85${\mu}m$의 선 간격으로 디자인 하였다. 그리고 구조는 2층 적층의 스파이럴 구조를 제안하여 소형화에 보다 유리하도록 설계를 하였다. 페라이트 혼합물질을 샌드위치 타입으로 EMI shielding한 인덕터의 경우 동작 주파수 5MHz에서 912nH의 인덕턴스, 29의 품질계수 특성을 나타냈으며, 그 결과 초소형 DC-DC 컨버터용 인덕터로서 소형화와 높은 효율을 만족하였다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1132-1133
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• 2015

In this paper, we are presents production and operation characteristics for inorganic EL phosphors device using screen printed. The EL device is composed as ITO PET / EL phosphors dielectric $(2{\times}2cm^2)/TiO^2$ paste/Ag electrode. At 100Vac 400Hz, the luminescence of inorganic EL phosphors were $60.33cd/m^2$ of red phosphor, $42.12cd/m^2$ of green phosphor and $58.45cd/m^2$ of blue phosphor. The output current was 12.57 mA, 17.11 mA and 11.98 mA, respectively. The inorganic EL phosphors of EL device are increasing efficiency EL device.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2008.05a
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• pp.21-24
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• 2008

Properties of carbon nano fiber (CNF) as field emitters were described. Carbon nano fiber (CNF) of herringbone was prepared by thermal chemical vapor deposition(CVD). Field emitters mixed with organic binders, conductive materials and were prepared by screen-printing process. In order to increase field emissions, the surface treatment of rubbing & peel-off was applied to the printed CNF emitters on cathode electrode. The measurements of field emission properties were carried out by using a diode structure inline vacuum chamber. CNF of herringbone type showed good emission properties that a turn on field was as low as 2.1 $V/{\mu}m$ and current density was as large as 0.15 $mA/cm^2$ of 4.2 $V/{\mu}m$ with electric field. Through the results. we propose that CNFs are suitable for application of electron emitters in Field Emission Devices.

• Proceedings of the Materials Research Society of Korea Conference
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• 2010.05a
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• pp.38.2-38.2
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• 2010

We have studied mechanisms of back contact formation in Al evaporation and screen printed Al paste for Si solar cells by TEM analysis. We observed that Si diffuse into Al during heat up. The Si diffusion process made vacancies in Si wafer. The Al began to seep into the Si wafer (Al spike). During heat down, the Al spike were shrink which causes the doped region (BSF).

• Food Science and Biotechnology
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• v.14 no.6
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• pp.743-746
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• 2005

A dipstick-type immunochemical biosensor for the detection of the organophosphorus insecticide fenthion was developed using a screen-printed electrode system as an amperometric transducer with polyclonal antibodies against fenthion as a bioreceptor. The assay of the biosensor involved competition between the pesticide in the sample and pesticide-glucose oxidase conjugate for binding to the antibody immobilized on the membrane. This was followed by measurement of the activity of the bound enzyme by the supply of the enzyme substrate (glucose) and amperometric determination of the enzyme reaction product ($H_2O_2$). The activity of the bound enzyme was inversely proportional to the concentration of pesticide. The optimized sensor system showed a linear response against the logarithm of the pesticide concentration ranging from $10^{-2}$ to $10^3\;{\mu}g/L$.