• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2011.04a
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• pp.347-350
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• 2011

Automobiles should be light and practical to reduce the price of manufacturing and maintaining expense. Hatchback vehicles are far from the silence for its practicality. This paper introduced the effective method of the planning of the asphalt material which applies the asphalt damping material. This paper showed the experiment which restrains the vibration of the vehicle trunk using asphalt damping material and chose the position of damping material using the velocity map and strain energy map and planed the optimum position.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2006.05a
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• pp.79-80
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• 2006

In order to raise productivity of the OLED and realization of the OLED TV, it is required to improve the design of the board size glass panel. The large-size glass substrate has some difficulties regarding its deflection during handling operation due to its small thickness (0.7t) which is not even enough to stand its mass itself. This paper is demonstrating a new solution of this difficult through clamping and bending end condition, which helps to minimize the deflection of the glass substrate.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2006.05a
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• pp.533-534
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• 2006

Micro pyramid pattern and its array are designed to enhance the brightness and its uniformity of LGP which is one of key parts in LCD. The designed micro pyramid patterns are fabricated on a Si-wafer first through MEMS process and then a Ni-stamper is electro-plated from the Si pattern master. Adopting the fabricated Ni-stamper, LGPs are injection molded at different mold temperatures and the fidelity of the pattern replication is estimated for each molding conditions and pattern locations. The replicated patterns are found to have some defect such as local short shot or micro weld line which are believed to have negative effect on the performance of the LGP.

• Proceedings of the KAIS Fall Conference
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• 2008.11a
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• pp.358-361
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• 2008

본 논문에서는 열화상촬영기 및 온도분포 해석 프로그램을 이용하여 금형가열온도와 실제 금형온도의 온도편차를 비교하여 금형가열 시 Stamper 표면의 온도분포를 해석하였다. 또한 전열가열방식(E-MOLD)을 이용하여 복합기능 도광판(Prismless LGP)을 제조하였고, 금형온도에 따른 복합기능 도광판(Prismless LGP)의 광특성 평가를 하였다. 그 결과 금형온도가 증가할수록 패턴 전사성 향상으로 인해 휘도 또한 증가하였고, 특히 유리전이온도($140^{\circ}C$) 이상에서 크게 상승하였다.

• Transactions of Materials Processing
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• v.16 no.4 s.94
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• pp.239-243
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• 2007

Superplastic forming/diffusion bonding(SPF/DB) has been widely used in the automotive and aerospace industry since it has great advantages to produce very light and strong components. Finite element method(FEM) is used to model the SPF/DB process of 3-sheet sandwich panel to predict the pressure-time curve and to analyze the process parameters. In order to eliminate defects of the part, a new pressurization scheme is proposed. Contrary to the conventional one-step pressurization, which causes the folding at the DB joint, two-step pressurization can eliminate the folding. Effect of pressurization cycle was investigated by using FE analysis and proper pressurization cycle is proposed.

• Transactions of the Korean Society of Automotive Engineers
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• v.5 no.1
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• pp.120-128
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• 1997

The variations of the temperature field in a passenger compartment were measured by using a HSI true color image processing system and TLC(Thermochromic Liquid Crystal) solution. This temperature measurement technique was proved to be useful for analyzing the ventilation flow. The flow field in the passenger compartment was visualized using a particle streak method with pulsed laser light sheet. The temperature field and flow field in the passenger copartment were affected significantly by the ventilation mode. The panel-vent mode heating had shorter elapse time to reach a uniform temperature than the foot-vent mode under the same ventilation condition and nonuniformity inside the passenger compartment could be minimized effectively by using the bilevel heating mode. The temperature increase rate in the rear passenger compartment was iower than the front compartment, especially in the vicinity of the rear seat occupants' knee level.

• 한국정보디스플레이학회:학술대회논문집
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• 2005.07a
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• pp.692-696
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• 2005

In an attempt to fabricate all inclusive display systems we are presenting a study on several elements that would be used as building blocks for all-on-board integrated applications on stainless steel foils. These systems would include in the same substrate all or many of the components needed to drive a flat panel OLED display. We are reporting results on both digital and analog circuits on stainless steel foils. Shift registers running at speeds greater than 1.0MHz are shown as well as oscillators operating at over 40MHz. Pixel circuits for driving organic light emitting diodes are presented. The device technology of choice is that based on poly-silicon TFT technology as it has the potential of producing circuits with good performance and considerable cost savings over the established processes on quartz or glass substrates (amorphous Silicon a-Si:H or silicon on Insulator SOI).

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2002.11a
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• pp.522-525
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• 2002

본 논문에서는 고휘도 LCD 백라이트 유닛에 사용되는 직하방식 백라이트 제조 방법을 이용하여 저전력, 고휘도, 경박 단소의 광고용 사인보드를 설계 제작하였다. 광학 시뮬레이션을 이용하여 램프의 배치 등 을 설계하였으며. 최고 16개의 냉음극관 램프를 구동할 수 있는 인버터를 설계 제작하였다. 크기 $500mm{\times}400mm$의 광고판의 경우 두께는 35mm 이었으며 휘도는 15,000lux이었다.

• Proceedings of the Optical Society of Korea Conference
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• 2005.07a
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• pp.204-205
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• 2005

Studies on display has been requested some major changes due to the high growth of the handheld terminal market. Therefore, the self emitting OLED(Organic Light Emitting Diode) has been interested as a next generation flat plane display because of its preeminent characteristics such as quick response characteristics, higher performance viewing angle, low power consumption, and panel floating. However, a trend of the display market is moving to three dimensional image processing instead of two dimensional flat display and various researches on display using hologram makes up for the difficulty in three dimensional display using typical flat display. In this study the Lenticular Screen Printing method is presented so that it can be applicable to organic semiconductor display devices and makes possible three dimensional display using flat display for complement the drawback of inorganic semiconductor.

• Proceedings of the Korean Society Of Semiconductor Equipment Technology
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• 2006.05a
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• pp.259-264
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• 2006

ITO 투명전도막은 현재 FPD(flat panel display)소자의 전극으로 사용되고 있다. 특히 근래에 많은 연구가 진행되고 있는 유기발광다이오드(organic light emitting diode: OLED) 소자의 제작에 투명전도막으로 많은 응용이 되고 있다. ITO 를 이용한 디스플레이 소자는 ITO 의 계면 상태와 전기적 특성에 따라 그 특성이 크게 변한다. 본 연구에서는 $O_2$ 플라즈마 처리를 통하여 ITO 투명전도막의 전기적 특성 및 표면상태의 변화에 대하여 조사하고, 이러한 특성 변화에 따라 현재 많은 연구가 진행되고 있는 OLED 소자의 제작에 응용하기 위하여 유기용액을 이용한 접촉각 측정을 통하여 $O_2$ 플라즈마 처리에 따른 ITO 투명전도막과 유기용액의 접착력에 대하여 고찰하였다.