• The Journal of the Korea Contents Association
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• v.9 no.4
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• pp.72-80
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• 2009

By the advent of an era of digital convergence, the user-friendly DTV graphic user interface (GUI) techniques become very important because of the explosive consumption of DTV receiving modules. This paper describes the design and implementation of GUI of menu-driven type for the operation of HDTV MPEG module. The designed GUI is convenient and user-friendly. Main menu is created by forming a new window and is located on the top area of the window in the structure of 1 by 3 matrix. Thus main menu, sub-manu, and lower-level menu can be displayed on a screen. The menu-driven DTV GUI was acomplished by using new styles and icons.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2009.06a
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• pp.48-48
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• 2009

최근 나노광전소자 응용에 큰 관심을 받는 물질인 산화물 나노선은 앞으로 불어 올 나노소재 시대를 여는 선두 물질이다. 이러한 산화물 나노선 가운데 가장 큰 관심을 받는 물질로는 산화아연 나노선을 들 수 있다. 삼화아연 나노선은 상온에서 큰 엑시톤 결합에너지 및 큰 밴드갭을 가지고 있으며 투명성 및 소자구동시 안정성을 지니고 있어 그 응용이 기대된다. 하지만 이러한 나노선을 이용한 광전소자 응용은 bottom-up 방식을 기초로 한 대면적 소자제작이 어렵다. 이러한 bottom-up 방식의 나노소자 제작에서 필요한 나노선 성장기술은 금속 catalyst 없이 대면적 성장, 나노선 수직어레이, 나노선의 고온성장, 기판 사이에 발생하는 자발적 계면층 제거 등으로 대표된다. 또한 나노선의 결정성 및 광특성 향상을 위해서는 고온성장이 불가피한데, 실리콘 기판과 같이 격자상수 불일치도가 큰 기판에서는 나노선 성장이 이루어지지 않고 다시 탈착되어 구조물이 성장되지 않는다. 본 연구에서는 선택적 삼원계 단결정 씨앗층을 이용하여 길이/직경 비가 매우 향상된 MgZnO 나노와이어를 interfacial layer 없이 수직으로 고온에서 성장하여 산화물 전계방출 에미터로서의 가능성을 확인하였다.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.46 no.2
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• pp.93-100
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• 2009

This paper presents a step up four channel DC-DC converter using charge pump voltage doubler structure. Our goal is to design and implement DC-DC converter for capacitive SP4T RF MEMS switch in front end module in wireless transceiver system. Charge pump structure is small and consume low power 3.3V input voltage is boosted by DC-DC Converter to $11.3{\pm}0.1V$, $12.4{\pm}0.1V$, $14.1{\pm}0.2V$ output voltage With 10MHz switching frequency. By using voltage level shifter structure, output of DC-DC converter is selected by 3.3V four channel selection signals and transferred to capacitive MEMS devices. External passive devices are not used for driving DC-DC converter. The total chip area is $2.8{\times}2.1mm^2$ including pads and the power consumption is 7.52mW, 7.82mW, 8.61mW.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.36 no.5
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• pp.487-493
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• 2012

We present interferometric modulators that reproduce RGB colors through the selective actuation of mechanically coupled mirror arrays having identical air gaps. The conventional transmittive interferometric modulators need additional backlights, which leads to high power consumption. The previous reflective interferometric modulators using ambient lights need three different air gaps for reproducing the three RGB colors, thus giving rise to process complexity. For process simplicity, we propose the use of reflective interferometric modulators that are capable of producing green, blue, red, and black colors with the aid of mechanically coupled mirrors with identical air gaps. In an experimental study, the present interferometric modulators reproduce green, blue, and red colors at the switching modes (000), (010), and (101). The spectrum peaks for the colors are measured at the wavelengths $511{\pm}5nm$, $478{\pm}3nm$, and $644{\pm}9nm$, respectively, with the bandwidths being $60{\pm}1nm$, $45{\pm}2nm$, and $105{\pm}4nm$, respectively; further, the maximum intensities of the colors are $77{\pm}5%$, $73{\pm}2%$, and $81{\pm}5%$, respectively. The black spectrum is measured below the intensity of $27{\pm}0%$. Thus, we experimentally demonstrate the color reproduction capability of interferometric modulators fabricated by using a simple process.

• Korean Chemical Engineering Research
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• v.51 no.4
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• pp.432-437
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• 2013

The CO preferential oxidation reaction (PROX) has been done using Cu catalytic active species supported on some of mesoporous silica materials which can facilitate the diffusion of the reactants in order to prevent the poisoning of anode active materials by CO molecules during driving polymer electrolyte fuel cells (PEMFC) in this study. As a result when SBA-15 with large pore used as a support showed excellent CO oxidation activity, especially the activity increased in proportion to the amount of supported Cu. Ti components which was inserted to increase the degree of dispersion of Cu, contributed to improving the performance for CO oxidation at low-temperature. The degree of dispersion of Cu ingredients was the best in the catalyst inserted 20 mol-% Ti into the framework of SBA-15, and CO oxidation activity was also improved.

• Proceedings of the IEEK Conference
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• 2000.09a
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• pp.627-630
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• 2000

본 연구는 현 Inner-wear매장에서 판매되어지는 제품을 소비자가 선택할 수 있는 한계 즉, 시각적인 면에 국한된다는 것에 착안하여 현실이 아닌 가상공간에서의 구매 즉 물리적 현실적 제약으로부터 현재 존재하지 않는 미래의 상황을 연출, 미리 볼 수 있도록 가상의 상황을 입체적으로 연출하여 Inner-wear를 쉽게 착용하고 그 모습을 자유롭게 검색하여 볼 수 있도록 하고자 한다. 자신의 신체를 만들어 보고 자신이 구매하고자 하는 제품을 골라 가상공간에서 자신의 신체에 직접 입혀보며 자신의 신체에 얼마나 잘 맞는지 직접 확인해 보고 구매 할 수 있도록 하는데 있다. 이 시스템은 Wed상에서 구동 할 수 있도록 구현되어 일반 소비자들이 어디서나 사이트에 접속하여 구매 할 수 있도록 할 것이다.

• Proceedings of the Acoustical Society of Korea Conference
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• autumn
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• pp.67-70
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• 2000

본 연구는 현 Inner-Wear매장에서 판매되어지는 제품을 소비자가 선택할 수 있는 한계 즉, 시각적인 연에 국한된다는 것에 착안하여 현실이 아닌 가상공간에서의 구매. 즉 물리적 현실적 제약으로부터 현재 존재하지 않는 미래의 상황을 연출, 미리 볼 수 있도록 가상의 상황을 입체적으로 연출하여 Inner-Wear를 쉽게 착용하고 그 모습을 자유롭게 검색하여 볼 수 있도록 하고자 한다. 자신의 신체를 만들어 보고 자신이 구매하고자 하는 제품을 골라 가상공간에서 자신의 신체에 직접 입혀보며 자신의 신체에 얼마나 잘 맞는지 직접 확인해 보고 구매 할 수 있도록 하는데 있다. 이 시스템은 Web상에서 구동 할 수 있도록 구현되어 일반 소비자들이 어디서나 사이트에 접속하여 구매 할 수 있도록 할 것이다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.9 no.1
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• pp.29-34
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• 2008

We fabricated the 4 channel wave function generator with variable frequency, pulse width, amplitude and rising/falling slope to develop driving method of charged particle type display. The selective sell driving is ascertained by fabricated panel with black and yellow particles. To measure CIE point, reflectivity, contrast ratio and viewing angle, experimental apparatus is integrated with optical circular$(1^{\circ})$ moving emitting/receiving part and spectrometer connected to emitting part. The yellow particles in glass have reflectivity of $35{\sim}40%$ and wavelength of 571.2nm and black one has reflectivity of $15{\sim}20%$ in case of only 1 layer of particle, and the case of 3 layer the optical property is promoted.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.39 no.4
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• pp.361-367
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• 2015

This paper presents the design concept of an intrinsic continuum robot for safe man-machine interface and characteristic behaviors of its end-effector based on real experiments. Since pneumatic artificial muscles having similar antagonistic actuation to human muscles are used for main backbones of the proposed robot as well as in the role of the actuating devices, variable stiffness of robotic joints can be available in the actual environment. In order to solve the inherent shortcoming of an intrinsic continuum robot due to bending motion of the backbone materials, a Kalman filter scheme based on a triaxial accelerometer and a triaxial gyroscope was proposed to conduct an attitude estimation of the end-effector of the robot. The experimental results verified that the proposed method was effective in estimating the attitude of the end-effector of the intrinsic continuum robot.

• Journal of the Society of Naval Architects of Korea
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• v.33 no.2
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• pp.36-43
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• 1996

An Attitude Control System for a high speed catamaran with contorl fins in waves is designed and investigated by the experimental methods. An optimal control theory is applied to design the automatic attitude control system of the high speed catamaran for its good seaworthiness. The experimental results performed in KRISO model basin for the displacements and accelerations for the model ship are measured in regular hear waves. Form the epxerimental results the effect of control planes is thought to be incroeasing with speed.