• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 C
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• pp.1375-1377
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• 2001

This paper describes the fabrication and characteristics of CrN thin-film type pessure sensors, in which the sensing elements were deposited on SUS. 630 diaphragm by DC reactive magnetron sputtering in an argon-nitride atmosphere(Ar-(10%) $N_2$). The optimized condition of CrN thin-film sensing elements was thickness range of 3500$\AA$ and annealing condition($300^{\circ}C$, 3 hr) in Ar-10 %$N_2$ deposition atmosphere. Under optimum conditions, the CrN thin-films for strain gauges is obtained a high resistivity, $\rho$=1147.65 ${\mu}{\Omega}$cm, a low temperature coefficient of resistance, TCR=-186 ppm/$^{\circ}C$ and a high temporal stability with a good longitudinal, 11.17. The output sensitivity of fabricated CrN thin-film type pressure sensors is 2.36 mV/V, 4$\sim$20 mA and the maximum non-linearity is 0.4 %FS and hysteresis is less than 0.2 %FS..

• 한국지역사회생활과학회지
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• 제26권4호
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• pp.775-783
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• 2015

This study investigates gender differences in cold perceptions and wearing behaviors for cold adaptation. A questionnaire composed of items on cold perceptions, intentions toward wearing additional clothing, and clothing for outdoor environments, among others, was used. Each item in the survey targeted 260 male (MS) and female (FS) college students evaluated using a five-point Likert-type scale. Data were statistically analyzed using the independent sample t-test and correlations. Main results can be summarized as follows: MS subjects showed lower dependence on the thermal insulation of clothing because they felt less cold and had the better ability to cope with cold. MS subjects had higher dependence on underwear during cold seasons, and FS subjects tended to wear heavier clothing to compensate for their cold feet with insufficient insulation. In addition, it was preferable to estimate thermal effects of actual wear by taking into account gender differences in the physique. The study is limited in that the room temperature and the actual amount of clothing were not measured, which offers an avenue for future research.

• 한국전기전자재료학회논문지
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• 제28권8호
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• pp.486-489
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• 2015

Power semiconductor device has a very long history among semiconductor, since the invention of low-pressure bipolar transistor 1947, and so far from small capacity to withstand voltage-current, high-speed and high-frequency characteristics have been developed with high function. In this study, the PWM IC Switch to the main parts used in IGBT (insulated gate bipolar transistor) for the low power loss and high drive capability of the simulator to Synopsys' T-CAD used by the 1,700 V NPT Planar IGBT, 1,700 V FS was a study of the Planar IGBT, the results confirmed that IGBT 1,700 V FS Planar is making about 11 percent less than the first designed NPT Planar IGBT.

• 한국물환경학회지
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• 제22권2호
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• pp.209-214
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• 2006

The purpose of this study is to improve the stream water quality by the experimental hybrid constructed wetland system. It consisted of the water layer, sand bed planted reeds, irises and roses, gravel bed, yellow-soil media bed and a flow shifter (FS) which can reverse top and bottom flow in the middle of the wetland. The organic compounds and nitrogen removal efficiencies varied with the seasons, namely temperature change. In summer, the mean efficiencies of COD and TN in the outflow from this wetland system were 63.4 and 48.0% and shown the highest, respectively, whereas, the suspended solids and phosphorus removal efficiencies seemed to be less affected by temperature. As a result of inspecting the decreasing trend of pollutants, nitrification-denitrification in the wetland was the major removal mechanism for nitrogen, the nitrogen reduction was especially enhanced by the application of a FS in the wetland, and phosphorus reduction was mainly occurred as a consequence of adsorption of the yellow-soil media.

• 한국광학회지
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• 제16권6호
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• pp.490-493
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• 2005

본 논문은 광자 결정 광섬유에서 100 fs의 펄스 폭을 갖는 펌프 광원의 파장과 입력파워에 따른 초 광대역 광원 생성에 대해 실험적으로 연구하였다. 적절한 파라미터들을 조절함으로써 광 스펙트럼 진폭의 균일함이 10 dB 이내에서 약 750 nm의 스펙트럼 폭을 갖는 초 광대역 광원을 얻어냈다. 사용한 광자 결정 광섬유의 길이는 2 m였고, 펌프광원으로는 모드 록킹된 Ti:Sapphire laser를 사용하였다. 또한, 펌프 광원의 여러 가지 변수들을 바꿔줌으로써 초 광대역 광원의 다양한 스펙트럼 현상을 조절할 수 있었다.

• 한국동물학회지
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• 제25권3호
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• pp.123-129
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• 1982

한국산 초파리집단의 유전적 특성을 생화학적으로 분석하여 분자유전학적 측면에서 집단 유전학적 체계를 확립하기 위하여 한국산 노랑초파리 (Drosophila melanogaster)의 11개 지역의 자연집단 (청량리, 등촌동, 신촌, 용산, 부천, 춘천, 대전, 대구, 광주, 나주 및 노화도)의 $\\alpha$-glycerophosphate dehydrogenase (\\alpha-GPDH) 인자형을 agarose gel 전기영동법에 의하여 조사 분석한 결과는 다음과 같다. 1. 한국산 노랑초파리 11가지 자연집단에서 $\\alpha$-GPDH allele는 상당한 다형현상을 이루고 있다. 2. $\\alpha$-GPDH allele의 heterozygosity는 $45\\sim50%$로서 상다히 높은 값을 보여주고 있다. 3. $\\alpha$-GPDH allele의 FF 인자형의 빈도는 SS인자형과 비슷하나 FS 인자형보다는 낮은 값을 보이고 있다. 4. $\\alpha$-GPDH allele의 F, S 두인자가 거의 비슷한 빈도를 보이고 있다.

• 한국전기전자재료학회논문지
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• 제32권3호
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• pp.213-218
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• 2019

In this study, a high-temperature vulcanizing (HTV) method was used to achieve a shore a hardness of 70. The basic base was composed of 60% silicon gum (GUM) which is a high-viscosity polymer, 30% fumed silica (FS), and 5% of plasticizer. The GUM and FS were mixed well with less than 1% silane to improve rubber strength. Expanded vermiculite was added as a filler at 10%, 15%, and 20%. The curing conditions were $170^{\circ}C$ for 10 min and a molding method was applied. We report herein, the results of inorganic analysis and flame-retardant and tracking tests on the expanded vermiculite. The flame retardance and tracking test outcomes for a shore a hardness of 70 were found to be optimal when the expanded vermiculite content was 10%.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2003년도 하계학술대회 논문집 Vol.4 No.2
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• pp.884-887
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• 2003

Strain gages were widely used transducers. Essentially a strain gage was an electric element to which an appropriate type was attached. Strain was sensed by gages and provided electrical output proportional to applied forced. This paper describes the recent development of a thick film strain gage ceramic pressure sensors. The thick film resistors as strain gage in the Wheatstone bridge were fabricated with a novel mixture of ruthenium. The thick-film technology of resistors were printed on the ceramic diaphragm back side by screen printing and cured at $850^{\circ}C$. The mechanical measurements were performed with the computer simulation results(ANSYS 5.1). The output sensitivity was 1.2mV/V, of which max. nonlinearity was less than 0.29%, hysteresis was less than 0.38%FS.

• 한국광학회지
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• 제26권6호
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• pp.318-321
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• 2015

We demonstrate a frequency-resolved optical grating (FROG) device for measuring the intensity and phase versus time of several-tens-of-picoseconds laser pulses, using a thick nonlinear optical crystal. The huge pulse-front tilt generated by a holographic grating increases the temporal range of the device, which can make a single-shot measurement of laser pulses less than 100 ps in duration. To verify the measurement technique, we generate double pulses using a Michelson interferometer. The measured duration of a single pulse is about 300 fs and the measured maximum delay of two pulses is 60 ps, which implies that the proposed FROG device can measure laser pulses with maximum pulse width of about 120 ps.

• 한국산학기술학회논문지
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• 제11권4호
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• pp.1483-1491
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• 2010

이 연구의 목적은 현재 한국 혼합치열기 어린이의 치아우식 충전 및 예방재료의 사용 실태를 파악하고자 하는 것이다. 한국의 4개 대도시 지역 7개 초등학교를 무작위로 선정하여 부모의 동의를 얻은 9세와 10세 어린이 711명을 대상으로 한 명의 검진자가 구강검진을 시행하였다. 연구 결과 우식경험유치면수는 $7.9{\pm}8.0$ ($ds=1.3{\pm}2.5,\;fs=6.6{\pm}7.6$)이고 우식경험영구치면수는 $1.4{\pm}2.2\;(DS=0.2{\pm}0.8,\;FS=1.1{\pm}2.1$)로 나타났다. 아말감, 레진, 실란트, 및 기타재료의 평균 충전 치면수는 각각 $2.8{\pm}3.9,\,1.6{\pm}2.8,\;2.9{\pm}3.2$, 및 $4.5{\pm}7.0$이었다. 지역별 충전 재료의 사용에 있어 아말감의 사용은 대구에서 가장 높았으며 레진은 부산에서 제일 높게 나타났다. 영구치의 치아우식 충전 및 예방 재료의 사용은 치아우식예방을 위한 치면열구전색재의 총 치면수가 전체의 약 70%를 차지하여 가장 많음을 알 수 있었고 충전재료로는 레진이 약 20%, 아말감은 약 10%의 비율을 보였다.