• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1996.04a
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• pp.136-141
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• 1996

A new suspension model of an optical pick-up actuator is developed. This model is very stable and easily manufactured owing to its specially designed geometry. In designing the suspension, the first two natural frequencies are kept lying in a certain range and sub-resonance frequencies are made as high as possible. The vibration and sensitivity analysis needed for optimal design is based on a simplified beam model of the bobbin-suspension structure. The investigation of the strain energy distribution in each vibration mode appears to be very useful.

• 제어로봇시스템학회:학술대회논문집
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• 2001.10a
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• pp.76.3-76
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• 2001

In this paper, an adaptive disturbance compensation technique is used in a tracking problem, under which the tracking reference is unknown. Based on a simple disturbance observer that effectively estimates the low frequency components of disturbance, the feedforward compensation is applied in addition to the conventional feedback control. Under the proposed compensation method, sensitivity analysis is given to illustrate the effectiveness. Finally, the proposed method is applied to the tracking problem in an optical storage system.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2002.11a
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• pp.377.2-377
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• 2002

In optical disk drives (ODD), the demands of high data density and high speed have been increasing rapidly to achieve high data capacity and data transfer rate The use of short wavelength laser and high track following performance are needed to raise data density and data rate. For high-performance actuator, the improvement of linearity and acceleration become more important. (omitted)

• Journal of the Optical Society of Korea
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• v.3 no.2
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• pp.69-73
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• 1999

This paper demonstrated the performance of a palladium wire hydrogen sensor based on a fiber Bragg grating as a means of developing a quasi-distributed hydrogen sensor network capable of operating at cryogenic temperatures. The new approach employing a fiber Bragg grating based palladium hydrogen sensor described in this study is advantageous over other traditional hydrogen sensors because of the multiplexing capability of fiber Bragg gratings. The sensitivity of the hydrogen sensor at room temperature is approximately 2.5 times that of the hydrogen sensor at cryogenic temperatures.

• Proceedings of the Optical Society of Korea Conference
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• 1999.08a
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• pp.174-175
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• 1999

• Proceedings of the Optical Society of Korea Conference
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• 2008.07a
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• pp.377-378
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• 2008

• Proceedings of the Optical Society of Korea Conference
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• 2008.07a
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• pp.405-406
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• 2008

In this paper, we will discuss the spectral characteristics of fiber Bragg gratings (FBGs) inscribed in two different types of polarization-maintaining fibers with side holes. One showed high signal-to-noise ratio (SNR), narrow bandwidth and high bending sensitivity, while the other one showed insensitivity to bending due to the small size of the side holes.

• Proceedings of the Optical Society of Korea Conference
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• 2006.07a
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• pp.399-400
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• 2006

Etched fiber Bragg grating, Sensitivity of fiber-Bragg-grating sensors to index of surrounding, Hybridization of DNA

• Proceedings of the Optical Society of Korea Conference
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• 2003.07a
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• pp.258-259
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• 2003

최근 수년간 polarimetry, Raman spectroscopy, near infrared (NIR) absorption spectroscopy, NIR scattering, optoacoustics 등의 방법을 통하여 비침습적으로 Glucose의 농도를 측정하려는 연구가 많이 시도되었다. 일반적으로 이들 방법은 sensitivity 와 signal-to-noise ratio가 매우 낮고 복잡한 알고리즘이 요구되어져 glucose 농도 측정에 한계가 있음이 드러났다. 본 연구에서는 polarization sensitive low coherence interferometer (PS-LCI) 기법을 이용하여 농도에 따른 stokes parameters를 측정함으로써 비침습적으로 glucose를 측정하는 것이 가능한지 알아보는데 그 목적이 있다. (중략)

• Proceedings of the Optical Society of Korea Conference
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• 1989.02a
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• pp.1-4
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• 1989

The Alexandrite (Cr:BeAl2O4) laser is one of the promising tunable (vibronic) solid state laser developed recently in the near infrared region (700~800nm) of the spectrum. The thermal lensing effect of rod may effect stable mode osicillation of the solid state laser. A design procedure of the Alexandrite laser resonator considering rod thermal lensing effect and misaligment sensitivity of the resonator will be presented.