• 대한의용생체공학회:학술대회논문집
• /
• 대한의용생체공학회 1995년도 춘계학술대회
• /
• pp.164-166
• /
• 1995

The objectives of study are to develop a peripheral device on the endoscopic surgery system. These systems are consist of the following units. They are a color monitor of high resolution, light source, computer system and endoscopic camera with a C-mount head, irrigator, color video printer, Super VHS recorder and a system rack. The color monitor is a NTSC monitor for monitoring the image projected of the surgical section. The lightsource is necessary to irradiate the interior of a body via an optic fiber, The light projector will adapt the brightness in accordance with changing distance from the object. A miniature camera using a color CCD chip and computer system is used to capture and control an image of the surgical section[1]. The video printer is a 300 DPI resolution using thermal sublimation methods, which is developed by Samsung Electronics Co., Ltd. The specification of the endoscopic data management system is consist of storage of a captured image and pathological database of patients [2-4].

• Bulletin of the Korean Chemical Society
• /
• 제24권12호
• /
• pp.1793-1798
• /
• 2003

A series of amorphous molecules that possess both photoconductive and electro-optic properties was synthesized in order to investigate photorefractive properties of bifunctional organic-glasses. Diethylaminobenzaldehyde-diphenylhydrazone was covalently attached to 5-(4-diethylamino-benzylidene)-1,3-dimethylpyrimidine-2,4,6-trione through a flexible alkyl chain (3, 4, 5, 6 and 10 carbons) containing two ether linkages. The longer linkage not only lowered the glass transition temperature ($T_g$) of the molecules, but also allowed faster orientation of the chromophore. To examine the photorefractive properties, a 50 ${\mu}$m-thick film was prepared from the mixture of a bifunctional molecule, butyl benzyl phthalate, and $C_{60}$. The photoconductivity of this composite was as high as $8.01\;{\times}\;10^{-12}$ S/cm at 60 V/ ${\mu}$m, and the maximum diffraction efficiency ( ${\eta}_{max}$) of 50 ${\mu}$m-thick film was about 5% at 80 V/ ${\mu}$m.

• 정보통신설비학회논문지
• /
• 제2권2호
• /
• pp.22-31
• /
• 2003

광통신 실습교육이 대학 및 전문교육기관에서 이루어지고 있으나 실습의 내용이 각부분별로 이루어지고 있어 광통신망 구축의 전반적인 내용을 이해하기 어려웠으며, 이에 따라 광통신의 교육은 단순한 접속위주의 교육만이 이루어져 시공현장에서는 단순한 기능인력으로만 취급되어져 왔다. 따라서, 시공현장에서 광통신망에 전체적인 내용을 평가하고 설계, 감독 및 실제 융착 접속까지 전반전인 내용을 습득할 수 있는 종합 광통신 실습교육 과정 및 종합교육장이 필요로 하게 되었다. 본 연구에서는 광통신 시공인력을 위한 실습교과 과정의 필요내용과 이를 실습할 종합광통신 실습장 구현에 필요한 내용을 제시하였다.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2000년도 하계학술대회 논문집 C
• /
• pp.1850-1852
• /
• 2000

In this paper, new Partial Discharge (PD) detection technique using Pockels cell was proposed and considerable apparent chaotic characteristics were discussed. For this purpose, PD was generated from needle-plane electrode in air and detected by optical measuring system using Pockels cell, based on Mach-Zehnder interferometer, consisting of He-Ne laser, single mode optical fiber, 50/50 beam splitter and photo detector. A qualitative analysis was carried out by drawing Return map for the normalized time series of the detected PD signals. The results are as follows:(a) Fixed points, between 0.7 and 1.0, are appeared clearly in the right upper area of the return map as the increase in the number of obtained data.(b) Considerable periodicity have been remarked even though exact period and length can not be determined.(c) The self-similarity can be also observed inasmuch as the late paths do not follow the previous ones. Accordingly, exact quantitative analysis such as embedding dimension, fractal dimension, and Lyapunov exponents should be carried out for deducing the quantitative properties regarding PD phenomena.

• 대한전자공학회논문지TC
• /
• 제37권7호
• /
• pp.24-30
• /
• 2000

본 논문에서는 SCM과 WDM방식의 아날로그 광 전송기술을 기반으로 IMT-2000 및 PCS 양 무선주파 수대역 전송에 사용 가능한 광 송수신기의 구조를 제안하고 이의 제작에 관련된 여러 파라미터들을 분석하였다. 특히 송신부의 고주파 신호와 LD사이의 임피던스 정합회로는 시뮬레이션을 통해 최적의 성능을 도출 하는 방법을 제안하였고, 또한 1.7GHz∼2.25GHz 대역에서 광 링크의 gain이 0dB일 때, 광 링크의 gain flatness 및 noise floor가 각각 ±1.5dB 및 -130dBm인 결과를 얻었다

• 약학회지
• /
• 제49권1호
• /
• pp.1-5
• /
• 2005

Near-infrared (NIR) spectroscopy has been widely applied in various field, since it is nondestructive and no sample preparation is required. In this paper, NIR spectroscopy was used for the determination of naproxen in a commercial pharmaceutical preparation. NIR spectroscopy was used to determine the content of naproxen in intact naproxen tablets containing 250 mg ($65.8\%$ nominal concentration) by collecting NIR spectra in the range of $1100{\sim}1750nm$. The laboratory-made samples had $46.1{\sim}85.5\%$ nominal naproxen concentration. The measurements were made by reflection using a fiber-optic probe and calibration was carried out by partial least square regression (PLSR). Model validation was performed by randomly splitting the data set into calibration and validation data set (63 samples as a calibration data set and 42 samples as a validation data set). The developed NIR calibration gave results comparable to the known values of tablets in a laboratorial manufacturing process with standard error of calibration (SEC) and standard error of prediction (SEP) of $1.06\%\;and\;1.04\%$, respectively. The NIR method showed good accuracy and repeatability. NIR spectroscopic determination in intact tablets allowed the potential use of real time monitoring for a running production process.

• 약학회지
• /
• 제49권2호
• /
• pp.115-121
• /
• 2005

In this study, the performance of a portable NIR system and a FT NIR spectrometer were compared to determine water content of hairless mouse skin. The stratum corneum parts wer e separated from the epidermal tissues by trypsin solution. NIR diffuse reflectance spectra of hairless mouse skin were acquired using a fiber optic probe. In the near infrared, water molecules show two clear absorption bands at 1450 nm from first overtone of O-H stretching and 1940 nm from the combination involving O-H stretching and O-H deformation. It was found that the variations of O-H absorption band according to water content. Partial least squares regression (PLSR) was applied to develop a calibration model. The PLS model showed a good correlation between NIR predicted value and the absolute water content of separated hairless mouse skin, in vitro. For both the portable and the FT NIR spectrometer, These studies showed the possibility of a rapid and nondestructive skin moisture measurement using NIR spectroscopy. The portable NIR spectrometer with a photodiode arrays-microsensor could be more rapidly applied for the determination of water content with comparable accuracy with the performance of a FT spectrometer .

• 로봇학회논문지
• /
• 제12권1호
• /
• pp.26-32
• /
• 2017

Previous shape sensors including bend sensors and optic fiber based sensors are widely used in various applications including goniometer and surgical robots. But theses sensors have large nonlinearity, limited in the range of sensing curvature, and sometimes are expensive. This study suggests a new concept of bend sensor using cable-conduit which consists of the outer sheath and the inner wire. The outer sheath is made of helical coil whose length of the central line changes as the sheath bends. This length change of the central line can be measured with the length change of the inner cable. The modeling and the experimental results show that the output signal of the proposed sensor is linearly related with the bend angle of the sheath with root mean square error of 5.3% of $450^{\circ}$ sensing range. Also the polynomial calibration of the sensor can decrease the root mean square error to 2.1% of the full sensing range.

• 한국군사과학기술학회지
• /
• 제6권1호
• /
• pp.21-29
• /
• 2003

The Strap Down Inertial Measurement Unit(SDIMU) is recently used for the sensor package of the modern underwater vehicles such as torpedoes and unmanned underwater-vehicles. For using SDIMU, an initial alignment must be carried out before the fire or navigation stage. The general initial alignment methods require that a mother vehicle Is a stationary condition or the Inertial Navigation System(INS) of vehicle is received the specific of data navigation from the mother vehicle. But an underwater vehicle dropped from aircraft is hard to satisfy above both necessary conditions of the general initial alignment. So, we suggest a new strap down initial alignment method of an underwater vehicle dropped from aircraft without using any aided sensors. The highlight point of this method is that a period of initial alignment is not before the fire but during running stage to fix alignment error. And we verify it by analyzing various data of S/W simulations, Hardware In the Loop Simulation(HILS) tests and sea trials.

• 한국산학기술학회논문지
• /
• 제12권7호
• /
• pp.3214-3219
• /
• 2011

오늘날 우리는 급속하게 발전하는 정보기술을 기반으로 하는 정보화 사회에 살고 있다, 이러한 정보기술의 발전에 힘입어서 정보산업은 급속하게 발전하고 있고 우리사회에 많은 변화를 가져오고 있다. 많은 정보기술 가운데 레이저 거리측정기는 여러 가지 어려운 상황에서 쉽게 거리를 측장할 수 있게 해주는 도구이다. 본 연구에서는 산업 현장이나 레져용 등 다목적으로 사용할 수 있는 레이저 거리측정기를 개발하였다. 개발된 레이저 거리측정기는 송신부와 수신부의 시간 차이를 이용하여 개발 되었으며 사람이 측정하기 어려운 여러 가지 환경에서 쉽게 사용이 가능하며 산업현장이나 일반 생활용으로 다양한 분야에 적용이 가능하다.