• 전기의세계
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• v.24 no.6
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• pp.45-49
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• 1975

후막 HIC는 computer 회로뿐만 아니라, 자동차의 전압 조정기 고출력, 증폭단, 텔레비젼 CRT관의 전력 구동단등의 고출력 회로와, 텔레비젼 또는 산엽용 전자 장치의 VHF, UHF, 회로 구성에 많이 이용된다. 국내에서는 전자시계 제작에 수개 업체에서 HIC 기술을 이용하고 있다. 더 높은 주파수대인 마이크로-웨이브대 (파장이 cm대에서 mm대에 이른다)장치의 소형화는 박막 HIC에 의하여 실현되고 있다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2009.06a
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• pp.369-370
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• 2009

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2008.06a
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• pp.141-142
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• 2008

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2010.11a
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• pp.73-74
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• 2010

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.06a
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• pp.615-618
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• 2005

All over the world, many kinds of micro-actuators were already developed for various applications. The actuators are using various principles such as electromagnetic, piezoelectric and thermopneumatic etc. The most of the micro-actuators have been made using 2D based MEMS technology. In these actuators, it is difficult to drive 3-dimensional motion. This characteristic gives the limit of actuator application. However, micro-stereolithography technology has made it possible to fabricate freeform three-dimensional microstructures. In this technology, 2-dimensional micro-shape layer is cumulated on the other layers. This layer-by-layer process is the main principle to fabricate 3-dimensioal micro-structures. In this research, a micro-bellows actuator that is vertically moving was developed using the micro-stereolithography technology. When pressure was applied into the bellows, a non-contact actuating motion is generated. For actuation experiment, syringe pump and laser interferometer were used for applying pressure and measuring the displacement. Several hundreds micro-scale actuation was observed. And, to demonstrate the feasibility of proposed actuation principle, in this research, a micro-gripper was developed using half-bellows structure.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.17 no.12
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• pp.1246-1253
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• 2007

The recent issue of optical pickup actuators is to apply optical storage devices to mobile devices such as a cellular phone and PDA. It requires actuators to become smaller than conventional types. As the size becomes smaller, the magnetic force is reduced and the assembly of optical pickup actuators becomes more difficult. In addition, its dynamic characteristics are changed. In this paper, methods to improve magnetic forces and dynamic characteristics are suggested and the optimal result of the plate spring design is obtained. A diamond shape magnet and the fine pattern coil (FPC) are used to improve magnetic forces and damping elements are attached to decrease the peak magnitude of the mode instead of using structural damping, mostly for the purpose of improving the accuracy of the finite element simulation. To get more stable dynamic characteristics than conventional ones, a plate spring is applied to the optical pickup actuator and it is optimized with topology and parameter optimization to obtain the concept and the detail design, respectively.

• Journal of Sensor Science and Technology
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• v.10 no.1
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• pp.1-8
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• 2001

Conventional microgyroscopes of vibrating type require resonant frequency tuning of the driving and sensing modes to achieve high sensitivity. These tuning conditions depend on each fabricated microgyroscopes, even though the microgyroscopes are identically designed. A new micromachined resonator, which is applicable to microgyroscopes with self-toning characteristics, is presented. Since the laterally driven two degrees of freedom (2DOF) resonator was designed as a symmetric structure with identical stiffness in two orthogonal axes, the resonator is applicable to vibrating microgyroscopes, which do not need mode tuning. A dynamic model of the resonator was derived considering gyroscopic application. The dynamic model was evaluated by experimental comparison with fabricated resonators. The microgyroscopes were fabricated using a simple 2-mask-process of a single polysilicon layer deposited on an insulator layer. The feasibility of the resonator as a vibrating microgyroscopes with self-tuning capability is discussed. The fabricated resonators of a particular design have process-induced non-uniformities that cause different resonant frequencies. For several resonators, the standard deviations of the driving and sensing frequencies were as high as 1232Hz and 1214Hz, whereas the experimental average detuning frequency was 91.75Hz. The minimum detuned frequency was 68Hz with $0.034mVsec/^{\circ}$ sensitivity. The sensitivity of the microgyroscopes was low due to process-induced non-uniformity; the angular rate bandwidth, however, was wide. This resonator could be successfully applicable to a vibrating microgyroscopes with high sensitivity, if improvements in uniformity of the fabrication process are achieved. Further developments in improved integrated circuits are expected to lower the noise level even more.

• Journal of the KSME
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• v.44 no.6
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• pp.48-52
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• 2004

과거 10여 년 간 Electro-Active Polymer(EAP) 분야는 큰 변형을 낼 수 있는 지능재료들이 출현함에 따라 인공근육을 만들 수 있는 가능성으로 인해 많은 관심이 모아지고 있다. EAP는 외부의 자극에 따라 큰 변위를 생성할 뿐만 아니라 근육과 같이 탄력성이 있는, 다른 재료기술들이 낼 수 없는 특성과 성능을 가지고 있다. EAP가 갖는 생체근육과 같은 작동을 할 수 있는 가능성은 곧 공상과학의 꿈을 이루고자하는 희망을 갖게 하며 인류의 문명발전에 크게 기여할 것이다. EAP는 차세대 마이크로 로봇, 오락산업 또는 초소형 비행체의 구동과 같은 인공근육 작동기의 응용분야를 창출하고 있다. EAP 작동기의 응용성은 폭넓으며 새로운 기술혁신의 기대를 불러 일으키고 있다. (중략)

• Proceedings of the Optical Society of Korea Conference
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• 2009.10a
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• pp.219-220
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• 2009

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2001.11a
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• pp.297-301
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• 2001

PC카드 형태로 개발되어 사용되는 보안토큰은 다양한 보안서비스를 바탕으로 차세대 정보보호 기술의 핵심기술로 떠오르고 있다. PC카드 보안토큰 휴대용 컴퓨터 운용을 위한 메모리 카드 표준 인터페이스를 수용하여 다양한 암호알고리즘 수행이 가능하고, 사용자의 요구조건을 비교적 쉽게 수용하고, 아울러 다양한 응용분야에 사용되는 등의 장점을 가지고 있다. 본 논문에서는 Motorola PowerPC 기반의 MPC860 마이크로 프로세서가 장착된 제어보드를 이용하여 PC카드 보안토큰에 대한 PCMCIA(Personal Computer Memory Card International Association) 카드 장치구동기 및 API(Application Program Interface)를 설계/구현하여 각각의 기능시험을 통해 그 기능들을 검증하였다.