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이정권(Jeoung Gwen Lee) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.3
Two-dimensional mesoscopic analysis (meso-analysis) is applied to the solids including microdefects such as microcracks or holes. For the problem of effective moduli of microdefected solids, various approximate schemes are introduced. Microcrack density and hole density are used for macro level parameter. Randomly and parallel distributed type of microcracks are considered. Several numerical studies using meso-analysis are carried out and the results are compared with several approximate schemes in order to show the validity of the proposed meso-analysis.
김윤석(Yoon Seok Kim),이정권(Jeoung Gwen Lee),정두한(Du Hwan Chung),고한서(Han Seo Ko) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
Demand of the LCD-TV is remarkably increasing with development of the LCD technology in these days. Thus, this research has analyzed problems such as heat transfer characteristics inside and outside the LCD-TV using numerical simulation and experiments. The simulated results have been compared with the experimentai resuits using an infrared (IR) camera and T-type thermocouples. The optimal design of structure has been proposed to improve the thermal efficiency of radiation from the comparison.
최 성식(Seong Sik Choi),이 정권(Jeoung Gwen Lee) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
Impact analysis of TFT-LCD module is very complicated because the structure is assisted with thin, small<br/> and non-uniform geometry. Especially, finite element modeling is more difficult and need time-consuming<br/> efforts. In this study, we developed LCD Impact Analysis System (LIAS) for the purpose of reducing the<br/> analysis time without accuracy reduction. This system contains pre-meshing data, material database, shock<br/> condition, auto-reporting etc. PATRAN and DYNA3D is used for meshing and solving. Previously, we<br/> performed impact test and reviewed the accuracy of analysis results. Simply we can control design parameters,<br/> the procedure such as meshing, running and reporting which are partially auto-prepared. By adopting<br/> proposed system, it is expected to achieve efficient impact analysis of LCD module.
대형 Digital TV 용 Display Unit의 강성 측정
김창희(Chang Hoi Kim),문성인(Seong In Moon),구자춘(Ja Choon Koo),최재붕(Jae Boong Choi),김영진(Young Jin Kim),이정권(Jeoung Gwen Lee) Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.3
As the digital TV markets rapidly growing, many manufacturers introduce large size flat screen TV units. There are two different display types available to large size models which are plasma and TFT-LCD. Since both are constructed with thin large panels that are mostly fragile to even moderate mechanical shock inputs. Some large size panels are severely resonated by the acoustic sound generated TV which deteriorates video quality. Recognizing the potential problems of large displays, accurate measurement of the panels is to be an essential task for the reliable design. Measurement of mechanical properties of a thin large crystallized panel such as TFT-LCD display with traditional material testing equipments is challenging. Since TFT-LCDs are constructed with combination of brittle glass panels, polymer sheets, and liquid crystal, their properties are not only anisotropic but also usually non -linear. Accurate measurement of the properties often requires very expensive facilities. Especially when the size of the test sample is as large as 40-inch or wider, direct measurement cost is prohibitive. Even worse, machining of the large TFT-LCD to make a smaller size specimen that could be fit into a material tester is not possible because of liquid crystal leakage. A new method for the measurement of elastic modulus of large TFT-LCD panel is presented in this article. The suggested method provides a simple, economic, and user-friendly way for measuring the elastic modulus of large panels with considerable level of accuracy.
TFT-LCD 모듈의 내충격성 향상을 위한 통합 CAE 시스템의 개발
서형원(Hyong-Won Seo),문성인(Seong-In Moon),구자춘(Ja-Choon Koo),최재붕(Jae-Boong Choi),김영진(Young-Jin Kim),최성식(Seong-Sik Choi),이정권(Jeoung-Gwen Lee) Korean Society for Precision Engineering 2004 한국정밀공학회지 Vol.21 No.9
Anti-shock performance is one of the most important design specifications of TFT -LCD modules. Since they are adopted for major display units of many mobile applications such as lap-top PCs, cellular phones, and palm pilots, they are able to accommodate and endure high level transient mechanical energy inputs. For the reasons, not only the LCD unit manufacturers but their customers like PC makers perform a series of strict impact/drop test on the units. Currently, designers are mostly relying on their own trial-error based experience for the anti-shock design. Thus those designs depending on only experience may result in disqualification from the drop/impact test during final product evaluation. Those shock failures of any new designs are prohibitive for both LCD and PC manufacturers. In order to avoid this problem, many designers are focusing on the development of computer-aided design tools that is directly connected to shock simulation capabilities and then shock-proof design cycle time could be significantly reduced. Development of an integrated CAE system for the shock-proof design is presented in this article. At every stages of the development of present work, practical industrial applicability and mass production feasibility are seriously considered and tested so that the system is to be used in the LCD design engineering field.
열화상카메라를 이용한 LCD-TV의 열분포 분석 및 방열 성능 향상을 위한 연구
김윤석,김용재,이정권,정두환,고한서 한국비파괴검사학회 2004 학술대회 논문집 Vol.- No.-
In these days, demand of a LCD-TV is remarkably increasing with development of the LCD technology. However, there are thermal problems for improvement of efficiecy for the LCD-TV. Thus, this research analyzed thermal problems such as convection and conduction heat transfer characteristics in the LCD-TV using an infrared (IR) camera. The results using the IR camera have been compared with those using T-type thermocouples. The results of the experiment showed that; 1. surface temperatures of inverter modules, CCFL and electrodes were higher than any other parts in the LCD-TV. 2. temperature distributions of the LCD-TV appeared asymmetrically based on the center line. 3. results of the two testing equipments agreed well.