• Transactions of Materials Processing
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• v.20 no.1
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• pp.60-63
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• 2011

BLU(back light unit) is one of kernel parts of LCD(liquid crystal display) unit. New 3-D micro-lens pattern for LGP(light guide plate), one of the most important parts of LCD-BLU, had been researched. Instead of dot pattern made by chemical etching or laser ablation, SCS(slanted curved surface) micro-lens pattern was designed with optical CAE simulation. This study introduce the method of design using optical CAE simulation for SCS micro-lens, the new fabrication method of micro-mold with SCS micro-lens pattern.

• Proceedings of the KSME Conference
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• 2007.05a
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• pp.1469-1474
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• 2007

In recent years, research to machine large-surface micro-features has become important because of the light guide panel of a large-scale liquid crystal display and the bipolar plate of a high-capacity proton exchange membrane fuel cell. In this study, in order to realize the systematic design technology and performance improvements of an ultra-precision machine for machining the large-surface micro-features, a structural characteristic analysis was performed using its virtual prototype. The prototype consisted of gantry-type frame, hydrostatic feed mechanisms, linear motors, brushless DC servo motor, counterbalance mechanism, and so on. The loop stiffness was estimated from the relative displacement between the tool post and C-axis table, which was caused by a cutting force. Especially, the causes of structural stiffness deterioration were identified through the structural deformation analysis of sub-models.

• Proceedings of the Korea Concrete Institute Conference
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• 2003.11a
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• pp.331-334
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• 2003

Since regulation or specification for the reinforcing method are quite ambiguous, structural design for the reinforcement can be subjectively and arbitrarily conducted. Thus, reasonable limitation and guide for the quantity of the reinforcement are required for the safe use of the structure after repair. In order to guarantee the safety of the structural member several items should be considered; reinforcing limit to avoid the brittle failure, least required strength of the existing member before reinforcement in order not to fail under the new serviceability load condition when reinforcing steel plates or CFRP sheets are harmed or subjected to fire.

• 한국정보디스플레이학회:학술대회논문집
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• 2005.07b
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• pp.1503-1506
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• 2005

This dissertation represents method concerning high performance prism LGP design in 17 inch TFT-LCD. By means of developing LGP with total size of 8mm that has prism on both upper side and bottom side, it is superior to previous printing way in gaining high brightness. It can realize actual material simulation on prism LGP production using 17inch injection process and about 20% luminance enhancement is achieved based on such method.

• Smart Structures and Systems
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• v.10 no.2
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• pp.111-130
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• 2012

Satellites with flexible lightweight solar panels are sensitive to vibration that is caused by internal actuators such as reaction or momentum wheels which are used to control the attitude of the satellite. Any infinitesimal amount of unbalance in the reaction wheels rotors will impose a harmonic excitation which may interact with the solar panels structure. Therefore, quenching the solar panel's vibration is of a practical importance. In the present work, the panels are modeled as laminated composite beam using first-order shear deformation laminated plate theory which accounts for rotational inertia as well as shear deformation effects. The vibration suppression is achieved by bonding patches of piezoelectric material with suitable dimensions at selected locations along the panel. These patches are actuated by driving control voltages. The governing equations for the system are formulated and the dynamic Green's functions are used to present an exact yet simple solution for the problem. A guide lines is proposed for determining the values of the driving voltage in order to suppress the induced vibration.

• Journal of the Korean Institute of Telematics and Electronics S
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• v.35S no.3
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• pp.120-130
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• 1998

In this study, we implemented a scanning capacitance decimicron micorscope(SCdM) which scans a surface of the object mechanically in two or two point five dimensions with a stylus of size 0.2.mu.m. X-Y stage and stylus driving method are used as the scanning method, and VHD disk plate and IC chip are used as the object. Experimenal resutl of these object show that SCdM obtain 0.1.mu.m resolution power which exceeds that of optical microscope, and this microscope will be used as a powerful tool for inspecting ULSI pattern or biological data as a decimicron mcirocope which zoom a function of optical microscope and guide STM. The experimental system is composed of a VHD video disk method which captures the capacitance changes of the video disk suface and converts it into video signal.

• The Korean Journal of Zoology
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• v.3 no.2
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• pp.9-12
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• 1960

Drosophila (Drosophila) trilineata sp.nov. : 국명 세줄등초파리 . 1. 본 종은 1958년 8월 6일에 울릉도의 성인봉에서 그리고 1958년 9월 5일 광릉에서 채집된바, 외형이 Drosophila trivittata Strobl 과 혹사하기에 비종으로 잘못 동정발표하였던 것이다. 연이나 1959년 10월 영국 Edinburgh 대학의 E.B. Basden이 이 본종의 표본을 관찰한 다음 저자가 채집한 상기종은 Strobl 종이 아니고 신종인 듯 생각한다는 암시를 받았기에 그 후세밀히 조사한 바 신종으로 신정할 수있었기에 여기서 발표하는 바이다. 2. 본종은 외형 특히 중배흉부의 stripe의 모양으로 보아 Drosophila trivittata Strobl 과 혹사하나 무미 plate 의 측부에 뚜렷한 knob가 있다는 점, genital arch와 clasper의 기리의 관계, phallic organ 의 형태, egg-guide 의 강모등에 뚜렷한 차이가 있다. 본종은 명백한 fungus feeder 로서 laboratory breeding 은 불가능이었다.

• Proceedings of the Optical Society of Korea Conference
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• 2009.10a
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• pp.103-104
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• 2009

We proposed the laminate thin film asymmetric Extruded-closed-polygon diffusion pattern that was able to improve the performance of back light unit. Developed a pattern of brightness and bright line, half-power angle attribute the improved performance in the uniform, and through the formation of a thin film stackable diffusion layer 970% improved perpendicularity brightness, and 580% improved horizontality brightness.

• Electrical & Electronic Materials
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• v.10 no.9
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• pp.889-894
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• 1997

A miniaturized wind-mill type ultrasonic motor which has diameter in 12.7 mm and thickness in 2.0mm using PMN-PZT piezoelectric ceramics was fabricated. The wind-mill type ultrasonic motors has only three plate and of two wind-mill shape slotted metal endcaps a rotor whose end is hollowed out so that its periphery fits with the shape of the stator and a bearing to guide the rotor. A Finite Element Analysis was carried out to obtain the endcaps behavior under a radial displacement change of piezoelectric disk and to optimize the structure of the number of slots. Increasing the applied voltage the revolution speed of ultrasonic motors was increased. The maximum speed of 700 rpm and the maximum torque of 0.22 nN·m of the wind-mill type ultrasonic motors were obtained.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1996.11a
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• pp.291-295
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• 1996

This paper discusses several design factors of a capacitance displacement sensor with a numerical method and several experiments and describes guide lines of the design of this type sensor. We introduce the charge density method for the analysis of this type sensor, which has feasible accuracy and efficiency. The analysis of this type sensor with the charge density method agrees with displacement sensitivity experiments of a circular plate capacitance sensor with the sensor amp based In the charge transfer principle.