• 한국정보디스플레이학회:학술대회논문집
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• 2005.07a
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• pp.31-35
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• 2005

A prerequisite for a wide market acceptance of 3D displays is the ability to switch between 3D and full resolution 2D. In this paper we present a robust and cost effective concept for an auto-stereoscopic switchable 2D/3D display. The display is based on an LCD panel, equipped with switchable LC-filled lenticular lenses. A demonstrator of this concept is made. We will discuss measurements and numerical simulations of the key optical characteristics of this display. The switching characteristics of LC-filled lenticular lenses are discussed and the overlap of the view distributions is introduced as a figure of merit for crosstalk. The 0.62 overlap in our present demonstrator design, gives an excellent 3D image quality, combined with a good depth impression.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2008.06a
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• pp.501-503
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• 2008

This paper presents the design of a 2.4 GHz low phase noise fully integrated LC Voltage-Controlled-Oscillator (VCO) in $0.18{\mu}m$ CMOS technology. The VCO is without any tail bias current sources for a low phase noise and, in which differential varactors are adopted for the symmetry of the circuit. At the same time, the use of differential varactors pairs reduces the tuning range, i.e., the frequency range versus VTUNE, so that the phase noise becomes lower. The simulation results show the achieved phase noise of -138.5 dBc/Hz at 3 MHz offset, while the VCO core draws 3.9mA of current from a 1.8V supply. The tuning range is from 2.28GHz to 2.55 GHz.

• The Transactions of the Korean Institute of Power Electronics
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• v.21 no.1
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• pp.10-18
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• 2016

In this study, an efficient clamp is proposed to reduce the switch voltage stress of a forward converter. The proposed clamp consists of a conventional LC snubber, a tertiary winding, and a diode. When the switch is turned OFF, the magnetizing inductor energy of the transformer is recovered directly into the flyback output, which is the tertiary winding and diode network, instead of circulating in the LC snubber. Therefore, switch voltage stress and circulating current caused by the magnetizing inductor energy are reduced. This condition improves the efficiency of the forward converter with limited switch voltage stress. A theoretical analysis and the design guidelines of the proposed converter are provided. Experimental results are also reported.

• 한국정보디스플레이학회:학술대회논문집
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• 2009.10a
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• pp.1361-1362
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• 2009

We challenge to use reactive mesogen optical elements which can be coated inside LC cell. The reactive mesogens as retarder barrier requirements can be achieved between a high performance 2D mode and a low cross talk stereoscopic 3D mode. The fabrication of a 10.1" diagonal LCD which co-operates with a polarizer to from a parallax barrier, is described. In addition, the parallax barrier of reactive mesogens can easily control in mass production and can thus be coated as extremely LC cell, significantly reducing the thickness of LCD. Finally, we have successed to design a switchable 2D/3D displays using reactive mesogen optical elements which can be achieved 3D displays within glasses.

• 한국정보디스플레이학회:학술대회논문집
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• 2007.08a
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• pp.549-552
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• 2007

Patterned vertical alignment (PVA) mode requires multi-domain to exhibit wide viewing angle whereas the transmittance is sacrificed. To overcome the demerit, a fine pattern was formed at folded region in PVA Z-shape electrode structure. In the present work fine patterns were formed near domain boundary regions where the unwanted field direction which causes the LC to tilt down in unwanted direction exists. Thereby transmittance is improved near those fine patterns. This method is very simple and more cost-effective process than the other methods. In this article, we show the method of fine pattern formation and its influence on LC molecule in PVA mode with Z-shape electrode structure.

• Proceedings of the KIEE Conference
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• 2001.07d
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• pp.2526-2528
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• 2001

본 논문은 Full bridge 방식의 LC 병렬구조를 갖는 400watt HID용 전자식 안정기 구조에 대한 해석과 항상 HID 램프가 일정한 출력을 갖도록 하는 제어 방법에 대해 다루었다. 전자식 안정기의 구조는 LC 병렬구조이다. 램프에 흐르는 전류값에 따라서 전자식 안정기의 동작주파수가 가변되는 구조를 가지고 있어, 램프 점등 초기에는 동작 주파수가 높다가 안정상태로 들어가면 주파수가 떨어지는 특성을 지니고 있다.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.262-263
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• 2007

In this paper, fully embedded and miniaturized diplexer has been designed, fabricated, and characterized for dual-band/mode CDMA handset applications. The size of the embedded diplexer is significantly reduced by embedding high Q circular spiral inductors and high DK MIM capacitors into low cost organic package substrate. The fabricated diplexer has insertion losses and isolations of -0.5 and -23dB at 824-894MHz and -0.7 and -22dB at 1850-1990MHz, respectively. Its size is 3.9mm$\times$3.9mm$\times$ 0.77mm (height). The fabricated diplexer is the smallest one which is fully embedded into low cost organic package substrate.

• Proceedings of the KIEE Conference
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• 1995.07a
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• pp.168-170
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• 1995

This paper proposes the circuit of the simple synthetic testing facility using LC resonance circuit. The analyzed results of the circuit which can be useful for the design stage of the testing facility are also shown. EMTP has been used to analyze the circuit. Two cases of short-circuit test results obtained from the simple synthetic testing facility in KERI are shown with the waveforms of current and voltage. The results also indicate that the simple synthetic testing facility using LC resonance circuit can be easily designed and used very usefully for the research and development for the switchgears.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.6
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• pp.358-365
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• 2020

This study was conducted to evaluate the apparent ileal digestibility (AID) and standardized ileal digestibility (SID) of amino acids in feed ingredients for use as protein sources in swine feed. A total of six weaned pigs (Landrace×Yorkshire×Duroc, 14.4±0.35kg) surgically fitted with a T-cannula in the distal ileum were used in this study and were randomly allotted to a 6×6 Latin square design. Corn germ, corn gluten meal (CM), corn gluten feed (CF), chlorella (CH), and lysine co-product (LC) were used for evaluation, and the experimental periods of each ingredient included 5 days for adaptation and 2 days for collection. CH and LC had significantly higher (p<0.05) AID of lysine (79.1% and 78.7%, respectively). The AID of methionine was not significantly different among all feed ingredients. The AID of threonine of CH was significantly higher (p<0.05) than those of other ingredients and was 81.8%. CH, LC, and CM had higher (p<0.05) SID of lysine (80.4%, 79.5%, and 77.0%, respectively). The SID of methionine showed no difference among all treatments. CH showed 81.8% SID of threonine, which was significantly higher (p<0.05) than LC and CF. In conclusion, chlorella and lysine co-product showed the greatest AID and SID of amino acids, which makes them potentially valuable feed ingredients for use as protein sources in swine feed.

• The Transactions of the Korean Institute of Power Electronics
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• v.21 no.2
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• pp.150-159
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• 2016

This paper presents a study on the design optimization of a 5 kW plasma discharger for driving plasma reactor. The proposed study is composed of a high-frequency inverter based on the full-bridge circuit using soft switching techniques for high-frequency switching. The switching frequency in the operating region is the area of 130-200 kHz. By applying the LC resonance technique and a variable switching frequency, control technique is designed to be stable under changes in the load characteristics of the plasma reactor. This paper presents a quantitative analysis technique for design optimization. Experiments are performed according to load characteristic variations depending on the vacuum of the plasma reactor. This paper has verified the topology and design method for the 5 kW plasma discharger design.