• Title/Summary/Keyword: Panel Study

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Analysis on the Fracture of a Panel Glass in a Liquid Crystal Display Module under Mechanical Shock (액정 디스플레이(LCD)의 패널유리 파손평가에 관한 연구)

  • Park, Sang-Hu;Lee, Bu-Yun;Eom, Yun-Yong
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.12
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    • pp.76-81
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    • 2000
  • Analysis on failure of the panel glass under mechanical shock is the main topic of this study. Since the glass for the LCD panel is thin, it needs to be designed to have enough toughness against mechanical shock. In this paper, a process of estimating fracture of the panel glass is proposed to guarantee reliability of the product. The fracture toughness of the panel glass is used as a criterion of the fracture based on an experimental approach. The stress intensity factor was calculated considering a model with the largest initial crack size on a cut surface and with the boundary force obtained from a dynamic finite element analysis. Critical surface roughness on the cut surface of a typical glass panel, to prevent fracture in case of bending mode, is obtained.

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Study on Noise Reduction of Plasma Display Panel (플라즈마 디스플레이의 소음 저감 연구)

  • Park, Dae-Kyong;Kweon, Hae-Sub;Jang, Dong-Seob
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2002.11b
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    • pp.693-698
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    • 2002
  • For the evaluation of the plasma display panel (PDP)'s noise, vibration and sound characteristics of fanless PDP are measured and investigated. PDP is a type of two-electrode vacuum tube which operates on the same principle as a household fluorescent light. An inert gas such as argon or neon is injected between two glass plates on which transparent electrodes have been formed, and the glass is illuminated by generating discharge. For this discharge, both high voltage and currents are needed and cause an acoustic noise. We investigated the noise characteristics connected with both a electromagnetic elements from SMPS to panel through X, Y and logic board, and a mechanical elements form panel to case through transfer path which related with vibration and heat. To reduce the noise of PDP, a discharge pulse memory design related with both higher brightness and lower power consumption is important and mechanical characteristics connected with dissipation process of both heat and vibration generated by panel discharge must be investigated.

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Formability of Aluminum 5182-Polypropylene Sandwich Panel for Automotive Application (자동차용 알루미늄 5185-폴리프로필렌 샌드위치 판재의 성형성)

  • Kim, Kee-Joo;Jeong, Hyo-Tae;Sohn, Il-Seon;Kim, Cheol-Woong;Kim, Joong-Bae
    • Transactions of the Korean Society of Automotive Engineers
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    • v.15 no.2
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    • pp.175-181
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    • 2007
  • The objective of this study was to develop formability evaluation techniques in order to apply aluminum sandwich panel for automotive body parts. For this purpose, newly adopting formability evaluation (using limit dome height and plane strain test) was carried out in order to secure the fundamental data for the measurement of sheet metal forming and the establishment of optimum forming conditions of the aluminum sandwich panel. The results showed that there were good agreements between the old formability evaluation method and the new method which was more simplified than that of old one. From the results of these formability evaluation, the formability of sandwich panel was higher than that of aluminum alloy sheet alone which was the skin component for the sandwich panel. Also, it was found that sandwich panel could reduce the weight and could have the same flexural rigidity simultaneously when it was compared to the automotive steel sheet.

A Study on Touchless Panel based Interactive Contents Service using IrDA Matrix

  • Lee, Minwoo;Lee, Dongwoo;Kim, Daehyeon;Ann, Myungsuk;Lee, Junghoon;Lee, Seungyoun;Cho, Juphil;Shin, Jaekwon;Cha, Jaesang
    • International Journal of Internet, Broadcasting and Communication
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    • v.7 no.2
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    • pp.73-78
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    • 2015
  • Touch panel is mainly applied to pressure type touch panel but it occur a low recognition rate and error during long-term use. So, it is partly applied to capacitive touch panel to compensate for these problems but it also can occur a same problems via pollutions. Touch technology has developed a various method but it is not used because of high costs and difficult installation process. So, in this paper, we proposed an input method of touchless panel using IrDA matrix. This method is conducted using an IrDA Matrix composed of depth sensor. It is possible to offer a various contents for multi user. The proposed technology need a development of a high sensitivity sensing method and high-speed processing method of position information for Seamless operation control. And, it is required high-precision drive technology. Also, we proposed a Seamless user recognition for interactive contents service through a touchless panel using IrDA matrix.

The Properties of Flexural Strength and Density of Extrusion Molding Concrete Panel Using Sepiolite (세피올라이트를 이용한 압출성형 콘크리트 패널의 휨강도 및 밀도 특성)

  • Jung, Eun-Hye;Kang, Cheol;Kim, Jae-Won;Lee, Jung-Koo;Choi, Hun-Gug;Kim, Jin-Man
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.05b
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    • pp.49-52
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    • 2006
  • Extrusion concrete panel is made by extrusion of high viscosity paste. The high viscosity paste is made by mix of cement, silica, reinforced fiber and thickening agent in the dry mixer and wet mixer subsequently, extrusion in the extruder, and curing in the normal steam curer and high pressure steam curer subsequently. To increase a flexural strength of the panel, it is used inorganic fiber as like asbestos. But it was known that the asbestos was harmful to human being lately, in the domestic area it is restricted usage in the construction materials. So, it is demanded the alternative material for asbestos in the extrusion concrete panel. This study is to investigate that the sepiolite is possible to be the alternative of asbestos. The 3 types of sepiolite is applied to the extrusion concrete panel. To investigate the properties of the panel with sepiolite, it is compared the control with asbestos in the flexural strength, the specific density and the spot compressive strength. From the test results, it was found that the panel with sepiolite B is higher than the control with asbestos in the flexural strength and in the density.

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The Study on the Fabrication and Characterization of Dielectric Materials of Front and Back Panel for PDP(Plasma Display Panel)

  • Chang, Myeong-Soo;Lee, Yoon-Kwan;Ryu, Byung-Gil;Park, Myung-Ho
    • 한국정보디스플레이학회:학술대회논문집
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    • 2000.01a
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    • pp.181-182
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    • 2000
  • The glass compositions of $PbO-SiO_2-B_2O_3$ system and $P_2O_5-PbO-ZnO$ system for the transparent dielectric materials for front panel and $P_2O_5-ZnO-BaO$ and $SiO_2-ZnO-B_2O_3$ for the reflective dielectric materials for back panel of PDP(Plasma Display Panel) were investigated. As a transparent dielectric materials for front panel, $PbO-SiO_2-B_2O_3$ glass showed good dielectric properties, high transparency and proper thermal expansion matching to soda-lime glass substrate. And the reflective dielectric materials for back panel were prepared from parent glass of $SiO_2-ZnO-B_2O_3$ system and oxide filler. It was found that these glass-ceramics are useful materials for reflective dielectric layers, as those have a similar thermal expansion to soda-lime glass plate, high reflectance, low sintering temperature.

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A Study on the Development of a Thin Flat Panel Photo-bioreactor Case (얇은 평판형 광생물 반응기 케이스 개발에 관한 연구)

  • Ahn, Dong-Gyu;Ahn, Yeong-Su;Jeong, Sang-Hwa
    • Journal of the Korean Society for Precision Engineering
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    • v.29 no.9
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    • pp.946-957
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    • 2012
  • The objective of this paper is to investigate into the development of a thin flat panel photo-bioreactor case with characteristics shapes. The thin flat panel photo-bioreactor case was designed to be manufactured from a plastic thermoforming process. A proper design with a relatively high rigidity was obtained through the structural analyses for different designs of the photo-bioreactor case. The thermoforming analyses were performed. From the results of the thermoforming analyses, a proper forming condition and the formability of the designed plastic photo-bioreactor case were estimated. The thermoforming moulds for the flat panel photobioreactor cases were manufactured. The thermoforming experiments were performed to examine the manufacturability of the designed flat panel photo-bioreactor cases. From the results of the thermoforming experiments, it was shown that thin flat panel photo-bioreactor cases with characteristic shapes can be manufactured from the designed thermoforming mould and process.

Hysteretic performance of a novel composite wall panel consisted of a light-steel frame and aerated concrete blocks

  • Wang, Xiaoping;Li, Fan;Wan, Liangdong;Li, Tao
    • Steel and Composite Structures
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    • v.41 no.6
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    • pp.861-871
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    • 2021
  • This study aims at investigating the hysteretic performance of a novel composite wall panel fabricated by infilling aerated concrete blocks into a novel light-steel frame used for low-rise residential buildings. The novel light-steel frame is consisted of two thin-wall rectangular hollow section columns and a truss-beam assembled using patented U-shape connectors. Two bare light-steel frames and two composite wall panels have been tested to failure under horizontal cyclic loading. Hysteretic curves, lateral resistance and stiffness of four specimens have been investigated and analyzed. Based on the testing results, it is found that the masonry infill can significantly increase the lateral resistance and stiffness of the novel light-steel frame, about 2.3~3 and 21.2~31.5 times, respectively. Failure mode of the light-steel frame is local yielding of the column. For the composite wall panel, firstly, masonry infill is crushed, subsequently, local yielding may occur at the column if loading continues. Hysteretic curve of the composite wall panel obtained is not plump, implying a poor energy dissipation capacity. However, the light-steel frame of the composite wall panel can dissipate more energy after the masonry infill is crushed. Therefore, the composite wall panel has a much higher energy dissipation capacity compared to the bare light-steel frame.

Equivalent boundary conditions to analyze the realistic fatigue behaviors of a bridge RC slab

  • Khan, Arslan Q.;Deng, Pengru;Matsumoto, Takashi
    • Structural Engineering and Mechanics
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    • v.82 no.3
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    • pp.369-383
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    • 2022
  • In this study, an equivalent boundary conditions (BCs) determination method is developed numerically for a panel reinforced concrete (RC) slab to realistically analyze the deformation and fatigue behaviors of a bridge RC slab. For this purpose, a finite element analysis of a bridge RC slab is carried out beforehand to calculate the stiffness of the bridge RC slab, and then the equivalent BCs for the panel RC slab are determined to achieve the same stiffness at the BCs to the obtained stiffness of the bridge RC slab at the corresponding locations of the bridge RC slab. Moreover, for the simulation of fatigue behaviors, fatigue analysis of the panel RC slab is carried out employing a finite element method based on a numerical model that considers the bridging stress degradation. Both the determined equivalent BCs and the BCs that have been typically applied in past studies are employed. The analysis results confirm that, in contrast to the panel RC slab with typically used BCs, the panel RC slab with equivalent BCs simulate the same bending moment distribution and deformation behaviors of the bridge RC slab. Furthermore, the equivalent BCs reproduce the extensive grid crack pattern in the panel RC slab, which is alike the pattern normally witnessed in a bridge RC slab. Conclusively, the panel RC slab with equivalent BCs behaves identical to the bridge RC slab, and, as a result, it shows more realistic fatigue behaviors observed in the bridge RC slab.

An Analysis of the Effects of Political and Economic Forces on the Export of Renewable Energy Technologies (재생에너지 기술의 수출에 대한 정치·경제요인의 영향 분석)

  • Sung, Bong-Suk;Nian, Liu
    • Management & Information Systems Review
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    • v.37 no.2
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    • pp.209-233
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    • 2018
  • This study investigates the question of how political and economic factors may affect the export of renewable energy technologies. The relationships are tested using panel data for 19 OECD member countries over the period 1992-2012. Before establishing the empirical model, the current study checks the characteristics of the panel data, which includes various panel framework analyses, such as tests for the presence of normality, structural breaks, first-order autocorrelation, heteroscedasticity, cross-sectional dependence, panel unit-root. From the panel framework analyses, a dynamic panel model is established to test the relationship between the variables examined in this study. In order to reduce the bias of the estimation of the dynamic panel model and obtain efficient parameters, this study uses the bias-corrected least square dummy variable(LSDVC) estimator to estimate the empirical model. The results of this study show that governmental policies expressed as coercive pressure and market size positively affect the export growth of renewable energy technologies. However, public pressure and traditional energy industry have no significant effects on export performance. Policy implications are presented based on the results of this study.