• 한국신재생에너지학회:학술대회논문집
• /
• 한국신재생에너지학회 2007년도 추계학술대회 논문집
• /
• pp.246-249
• /
• 2007

The application of photovoltaics into building as integrated building components has been paid more attention worldwide. Photovoltaics or solar electric modules are sol id state devices, directly converting solar radiation into electricity; the process does not require fuel and any moving parts, and produce no pollutants. And the prefab building method is very effective because the pre- manufactured building components is simply assembled to making up buildings in the construction fields especially the sandwich panel. So, this paper describes a design and performance test of the 10kW poly metal pv module(pmpp) system. It is concluded that the prediction of BIPV system's performance should be based on the more accurate PV module installation.

• 한국전기전자재료학회논문지
• /
• 제25권8호
• /
• pp.651-656
• /
• 2012

A study on capacitive characteristics of stylus pen for touch panel are progressed in this paper. Also the main factors for capacitive sensitivity are studied. Namely, highly sensitive stylus pen which can be applied to capacitive touch panel are studied based on the analysis of materials and process conditions regardless of pattern shapes. Stylus pen was made of PDMS(Poly-Di-Methyl-Siloxane) and conductive metal powders which does not damage the touch panel surface. We tried to get the advantages of both the properties of soft PDMS and conductive metal powders. We found that potential difference of capacitance change with conductivity of the composite materials(PDMS + metal powders) it implies that during touch process, large voltage difference can be caused by the high conductive materials of stylus pen. Stylus pen made by PDMS with mixed with Ag powders which has large conductivity shows more capacitance change of 1 pF than PDMS with other materials of Ni or C powders.

• 대한전자공학회논문지SD
• /
• 제39권2호
• /
• pp.1-6
• /
• 2002

본 논문에서는 UXGA(Ultra extended Graphics Array)급 TFT LCD Driver를 지원하는 Analog Flat Panel Interface(AFPI)용 Module을 설계하였다. 제안하는 AFPI는 8-b ADC, 자동이득 제어기(AGC), 저잡음 PLL로 구성 되어있다. 8-b ADC는 고속동작과 저전력 기능을 위한 새로운 구조로서 FR(Folding Rate)이 8, NFB(Number of Folding Block)이 2, Interpolation rate이 16이며, 분산 Track and Hold구조를 사용하여 Sampling시 입력주파수를 낮추어 높은 SNDR을 얻을 수 있었다. 또한 Gain과 Clamp을 통제 할 수 있는 Programmable한 AGC, 낮은 Jitter Noise PLL을 설계하였다. 제안된 Module은 0.2㎛, 1-Poly 5-Metal, n-well CMOS공정을 사용하여 제작되었으며, 유효 칩 면적은 3.6mm × 3.2mm이고 602㎽의 전력소모를 나타내었다. 입력 주파수는 10㎒, 샘플링 주파수 200㎒에서의 INL과 DNL은 ±1LSB 이내로 측정되었으며, SNDR은 43㏈로 측정되었다.

• 한국응용과학기술학회지
• /
• 제17권4호
• /
• pp.257-261
• /
• 2000

Monodisperse polymer particles have many industrial applications such as surface coatings for metal panels, chromatographic media, spacers for liquid crystal display panel, and fillers for cosmetics, etc.. Micron-size monodispersed poly(methyl methacrylate) particles were prepared by dispersion polymerization in methanol medium in the presence of poly(vinyl pyrrolidone) and 2,2'-azobis(isobutyronitrile) as steric stabilizer and initiator, respectively. Effects of polymerization parameters, such as monomer and initiator concentration, stabilizer type and concentration, solvent composition on average particle size and size distribution were studied.

• 분석과학
• /
• 제30권2호
• /
• pp.75-81
• /
• 2017

5-methylthioninhydrin (5-MTN) is an amino acid sensitive reagent used for the development of latent fingermarks deposited on porous surfaces such as paper and wood. The present study demonstrates that the 5-MTN can be used as a latent footwear impression enhancement reagent, by reacting with trace multivalent metal ions, which are the main components of the latent footwear impression. 5-MTN and L-alanine complex (MTN-ALA) used for the latent footwear impression development was prepared, by mixing $4.5{\times}10^{-3}M$ 5-MTN (in methanol) and $4.5{\times}10^{-3}M$ L-alanine (in methanol) in 1:1 ratio, and keeping undisturbed at room temperature for 24 h. The latent footwear impressions were deposited on white and black non-porous surfaces (glass plate, polyethylene panel, polypropylene panel, acryl panel, polyvinyl chloride (PVC) panel, poly(methyl methacrylate) (PMMA) panel, acrylonitrile-butadiene-styrene (ABS) panel, tile), and a semi-porous surfaces (painted wood). The latent footwear impressions on these surfaces were treated with MTN-ALA complex by spraying. The fluorescence of footwear impressions (occurred due to the reaction between MTN-ALA and metal complexes) was observed under a 505 nm forensic light source and an orange barrier filter. The enhancement of latent footwear impression was achieved from black surfaces without any blurring. However, the fluorescence (enhancement) of footwear impression was not observed on the white PVC, PMMA, and ABS surfaces, because the incident light interfered and reflected on the surface. The sensitivity of MTN-ALA was superior to 2,2'-dipyridil, which is a representative non-fluorescing footwear impression enhancement reagent, and similar to 8-hydroxyquinoline, which is a representative fluorescing footwear impression enhancement reagent.

• 한국정보디스플레이학회:학술대회논문집
• /
• 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.I
• /
• pp.692-696
• /
• 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).

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2002년도 하계종합학술대회 논문집(2)
• /
• pp.293-296
• /
• 2002

This paper proposes new driving methods for designing a driver independent of the current property of organic light emitting diodes (OLED) displays. The proposed methods are the Look-Up Table (LUT) and the Pulse Width Modulation (PWM). The LUT is used to handle the amount of the current for driving the OLED display panel and the PWM is applied to represent the gray scale on the OLED display panel. Segment and common drivers were implemented using delay circuits to prevent short-circuit current and a DC-DC converter was designed to supply the drivers with a power source. In particular, tile proposed methods are used for the manufacturing of 1.8" 128$\times$128 dot passive matrix OLED display panel. The designed circuit was fabricated using 0.6w, 2-poly, 3-metal, CMOS process and applied to the Personal Communication System (PCS) phone successfully.ully.

• 대한전기학회논문지:전기물성ㆍ응용부문C
• /
• 제53권5호
• /
• pp.237-241
• /
• 2004

Amorphous silicon (a-Si) films are used in a broad range of solar cell, flat panel display, and sensor. Because of the greater ease of deposition and lower processing temperature, thin films are widely used for thin film transistors (TFTs). However, they have lower stability under the exposure of visible light and because of their low field effect mobility ($\mu$$_{FE}$ ) , less than 1 c $m^2$/Vs, they require a driving IC in the external circuits. On the other hand, polycrystalline silicon (poly-Si) thin films have superiority in $\mu$$_{FE}$ and optical stability in comparison to a-Si film. Many researches have been done to obtain high performance poly-Si because conventional methods such as excimer laser annealing, solid phase crystallization and metal induced crystallization have several difficulties to crystallize. In this paper, a new crystallization process using a molybdenum substrate has been proposed. As we use a flexible substrate, high temperature treatment and roll-to-roll process are possible. We have used a high temperature process above 75$0^{\circ}C$ to obtain poly-Si films on molybdenum substrates by a rapid thermal annealing (RTA) of the amorphous silicon (a-Si) layers. The properties of high temperature crystallized poly-Si studied, and poly-Si has been used for the fabrication of TFT. By this method, we are able to achieve high crystal volume fraction as well as high field effect mobility.

• 전자공학회논문지
• /
• 제50권10호
• /
• pp.231-238
• /
• 2013

본 논문은 플랫판넬 디스플레이 장치에 사용할 DC-DC 변환기의 설계에 관한 것이다. 6~14[V]의 단일 DC 전원전압으로부터 플랫 판넬 백바이어스용 -5[V] DC 전압 발생회로(Negative DC Voltage Generator)와 승압된 15[V], 23[V] DC 전압 발생회로, 그리고 강압된 3.3[V] DC를 얻기 위한 회로를 설계하였다. 또한 기준 전압원으로 사용하기 위한 밴드갭 회로와 발진기, 레벨변환기 회로, 고온보호 회로 등을 설계하였다. 제작공정은 부(-)전압으로 동작하는 회로와 기타 회로를 분리하기 위해서 트리플-웰(Triple-Well)구조가 적용된 공정 내압 30[V], 최소선폭 0.35[${\mu}m$], 2P_2M CMOS 공정을 사용하였다. 설계된 모든 회로는 시뮬레이션으로 검증하여 동작을 확인하였으며 원 칩으로 제작하여 플랫판넬 디스플레이 장치에 응용할 수 있도록 기능을 확보하였다.

• 한국콘텐츠학회논문지
• /
• 제7권1호
• /
• pp.116-123
• /
• 2007

본 논문은 OLED 패널 소스 구동회로에서 구동 전류의 크기와 폭을 조절하는 새로운 amplitude width modulation(AWM) 방식을 제안하였다. 기존의 소스 구동회로에서 pulse amplitude modulation(PAM) 방식은 DAC 회로 추가로 인해 크기가 커진다는 단점이 있고, pulse width modulation(PWM) 방식은 낮은 그레이 신호 레벨에서 발광 효율이 나쁜 단점이 있다. 이와 같은 단점을 개선하기 위해 본 논문에는 색상 데이터 비트의 MSB를 이용하여 구동 전류의 레벨을 제어하고, 데이터 비트의 LSB를 이용하여 구동 전류의 폭을 조정하는 구동방식을 제안하였다. 제안된 구동 방식은 $0.35-{\mu}m$ 3-poly 4-metal CMOS high voltage 공정을 사용하여 구현하였다. 시뮬레이션 결과는 제안된 AWM 구동 회로가 PAM 방식에 비해 회로 크기를 줄였고 신호 레벨이 낮은 영역에서 PAM과 거의 동일한 발광 효율을 얻었다.