• 대한화학회지
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• 제29권3호
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• pp.220-225
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• 1985

불꽃 원자 흡수 분광법의 Micro Sampling Technique을 이용하여 염의 농도가 높고, 양이 제한된 시료중에 미량으로 함유된 Cu, Zn 및 Fe의 분석을 시도하였다. 최적기간 및 분석조건을 조사한 결과 측정시간 0.3초, 시료부피 100${\mu}l$, 시료의 흡입속도 7.5ml/min, 연료와 산화기체의 혼합비 2.0 및 버어너 높이는 Cu일때 6.0mm, Zn 및 Fe는 8.0mm이었다. 이 방법을 일반적인 불꽃 방법과 비교하여 보면 시료의 전처리 과정이 필요없이 간단하고, 비교적 정밀성과 정확성이 있으며, 특히 100${\mu}l$정도로 양이 제한된 시료와 약 20% 정도로 염의 농도가 높은 시료의 경우도 버어너 틈새가 막히지 않고 안정한 불꽃에서 분석이 가능하였다.

• 한국마린엔지니어링학회:학술대회논문집
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• 한국마린엔지니어링학회 2011년도 전기공동학술대회 논문집
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• pp.312-312
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• 2011

IMO BWM 협약이 발효가 되면 선박에 Ballast 수 처리 시스템 탑재 후 국가 간 항구 도착 시 각주관청의 Ballast water Discharge regulation D-2 만족 여부를 검사받게 된다. Ballast Water Sampling Device는 이러한 D-2 규정에서 요구하는 많은 양의 시료를 농축 후 신속히 분석하여 DATA의 신뢰성을 확보하기 위한 시료 전처리 장비로써, 그 활용성이 매우 클 것으로 판단된다. 본 연구 개발을 통해 개발된 Sampling Device의 특징은 많은 양의 시료를 효율적으로 농축하는 농축조와 농축 후 플랑크톤 네트에 잔류하는 미생물을 회수하는 린싱조로 구성되며, 다양한 실검증을 통해 최적의 조건을 확립하였다. 또한 모든 Sampling 공정이 자동화로 구현됨으로서 선박에 적합한 효율적인 Operating이 이루어질 수 있도록 구성하였다.

• 보존과학회지
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• 제23권
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• pp.73-80
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• 2008

이 연구에서는 고고학 유물의 진위여부를 판단하기 위하여 미세시료채취법을 적용하여 시료를 채취한 후 화학적으로 분리된 세립 석영 입자의 고고선량을 산출하였다. 진위판별 연구에 앞서 미세시료채취법의 타당성은 백제무령왕릉 출토 전(塼)에서 산출된 고고선량 값들로부터 입증되었다. 이를 바탕으로 고구려 시대에 제작되었다고 주장되는 4점의 고고학 유물에 미세시료채취법을 적용하여 극소량의 시료를 채취한 후 단일입자재현법으로 고고선량을 산출하였다. 모든 유물에 대하여 고고선량 값은 0.2Gy 이하로 매우 낮았으며 단일시료재현법으로 산출된 값과 비교한 결과 매우 신뢰도가 높음을 알 수 있었다. 그러므로 유물의 고고학적 상황과 국내에서 고고선량은 평균적으로 1,000년 당 약 3.5Gy 내외의 값을 가진다는 점으로 미루어 판단하건데, 이 유물들은 고구려 시대에 제작된 유물이 아닐 가능성이 매우 높았다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 D
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• pp.2643-2645
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• 2001

In this paper, a problem of limited sampling time that occurs essentially in digital data acquisition system is discussed. Low sampling frequency and a lot of processed data in micro-controller interferes normal operation of the controller from acquiring information in some case. To settle this problem, we design the sub-system which consists of a new simple micro-controller. which is managed the particular sensor making the trouble to main-controller system.

• 제어로봇시스템학회논문지
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• 제20권8호
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• pp.849-853
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• 2014

In micro-scale electromechanical systems, the power to perform accurate position sensing often greatly exceeds the power needed to generate motion. This paper explores the implications of sampling rate and amplifier noise density selection on the performance of a system identification algorithm using a capacitive sensing circuit. Specific performance objectives are to minimize or limit convergence rate and power consumption to identify the dynamics of a rotary micro-stage. A rearrangement of the conventional recursive least-squares identification algorithm is performed to make operating cost an explicit function of sensor design parameters. It is observed that there is a strong dependence of convergence rate and error on the sampling rate, while energy dependence is driven by error that may be tolerated in the final identified parameters.

• Asian-Australasian Journal of Animal Sciences
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• 제19권8호
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• pp.1139-1147
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• 2006

This study was conducted to evaluate the trace elemental nutritive values of soil and forages collected from southwestern part of the province of Punjab, Pakistan. Soil and forage samples were collected fortnightly for two seasons. The concentrations of some trace minerals varied greatly among seasons and sampling periods. Seasonal effects were found in all soil micro-minerals except zinc, while forage iron, zinc, and selenium were affected by seasonal changes. Sampling periods effects were observed in all soil minerals and in forage copper, iron, zinc, and manganese only. All soil mineral levels except cobalt and selenium were sufficiently high to meet the requirements of plants for normal growth during both seasons. In contrast, soil Co and Se levels were severely deficient during both seasons and considered inadequate for plant growth. Soil Fe, Zn, Co, and Se levels were higher, and Cu and Mn lower during winter than those during summer. Forage Zn levels during summer were at marginal deficient levels, and in contrast, all other forage micro-minerals were within the required range for ruminants during both seasons. Although forage mico-minerals were within the range required by the ruminants, they were not sufficiently high to prevent the predisposition to various diseases caused by nutrient deficiency. Consequently, grazing animals at this location need continued mineral supplementation of these elements with a mixtures of high bio-availability rather than of high micro-mineral contents to support optimum ruminant productivity.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2004년도 ICCAS
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• pp.1655-1658
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• 2004

In this paper, we design and implement remote servo motor control system with real-time micro embedded operating system. The system, where controller and camera image grabber are mounted, handles control commands transmitted from a remote PC web browser. A hard real-time servo motor driver running on the real-time micro embedded OS and then a digital control application which confirms precise sampling time intervals is constructed. Frame grabber images transmitted from camera are saved in a image data format to view on remote PC web browser.

• 한국정밀공학회지
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• 제16권12호
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• pp.143-151
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• 1999

The shape of surface micro-crack is very irregular due to nonhomogeneous microstructure but is very important in respect to qualitative estimation of fatigue life. Fractal geomety can quantify the shape of surface mciro-crack. Fractal dimension is measured for surface micro-cracks with coast line and box counting method and estimates cycle ration in Al 2024-T3. The average fractal dimension $D_{favg}$ of surface micro-cracks has 3-parameter weibull distribution and location parameter is nearly constant but shape parameter decreases as cycle ration increases. The fractal dimension by coast line method is measured for individual surface micro-crack but the fractal dimension by box countin method is measured for all the surface micro-cracks under sampling area. Therefore, This paper shows fractal dimension $D_{fb}$ can predict cycle ratio $N/N_f$ more convenient than fractal dimension $D_{favg}$.

• 한국생산제조학회지
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• 제26권3호
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• pp.285-291
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• 2017

Micro-needles are used as transferring devices for sampling of tiny constitute substances from biological bodies. Typically, nickel is used as a coating to improve the rigidity of micro-needles. This study introduces the methodology to manufacture a WC needle with very high hardness and toughness. Micro-EDM technology was used to manufacture micro-needles with holes $130{\mu}m$ in diameter and $2300{\mu}m$ in length. A micro-needle was aligned to the micro-EDM electrode using a custom two degree-of-freedom alignment system. A three-step manufacturing technique was developed to drill a micro-hole using a WC electrode. In the first process, an electrode $105{\mu}m$ in diameter was used to make a hole. Electrodes of 90 and $105{\mu}m$ diameters were used in the second and third process, respectively. Consequently, a WC micro-needle with an inner hole of $135{\mu}m$ diameter, length of $2300{\mu}m$, and outer diameter of $300{\mu}m$ was developed.

• 센서학회지
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• 제26권1호
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• pp.60-65
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• 2017

This paper describes the low noise and low power IC using the opamp sharing technique for the capacitive micro-sensor sensing platform. The proposed IC reduces noise using correlated double sampling (CDS) and reduces power consumption using the opamp sharing technique. The IC is designed to be fully programmable, and can be digitally controlled by serial peripheral interface (SPI). The power consumption and the integrated input referred noise are 1.02 mW from a 3.3 V supply voltage and $0.164aF_{RMS}$ with a bandwidth of 400 Hz. The capacitive sensitivity, the input-output linearity and the figure of merits (FoM) are 2.5 mV/fF, 2.46 %FSO, and 8.4, respectively.