• Proceedings of the Optical Society of Korea Conference
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• 2005.07a
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• pp.302-303
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• 2005

• Proceedings of the Korean Nuclear Society Conference
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• 1999.10a
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• pp.125.2-125
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• 1999

• The Journal of the Acoustical Society of Korea
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• v.38 no.4
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• pp.443-449
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• 2019

To protect the patient's internal organs when a patient with cardiovascular disease occurs, it is important to reduce the elapsed time by providing emergency medical services. Decisions for conducting cardiopulmonary resuscitation are mainly made using the carotid palpation method, which directs the pulse of the carotid artery, which can diagnose the patient's condition according to one's own subject and cause cerebral blood flow to be blocked by excessive pressure in the carotid due to the weaken cardiopulmonary function. In this study, we developed a multimodal patch-type probe based on multi-channel ultrasound Doppler pairs and oxygen saturation measurement modules which can monitor cardiopulmonary functions. From the in-vivo experiments, the developed probe can be utilized as a novel tool that can increase the survival rate of cardiovascular disease patients by objectively monitoring the cardiopulmonary function of the patient quantitatively and promptly in an emergency situation.

• Journal of the Korean Society for Precision Engineering
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• v.10 no.3
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• pp.205-219
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• 1993

제품의 기하학적 칫수 공차는 생산제품의 품질관리에 매우 종요하며, 측정기기의 발달과 함께, 컴퓨터를 이용한 기하하적 공차 해석의 수요와 경향은 늘고 있는 추세이다. 본 논문에서는, ISO의 공차 정의에 기초한 공차들(진직도공차, 편평도공차, 진원도공차, 평행도공차, 직각도공차, 윤곽공차)을 해석할 수 있는 컴퓨터 모듈이 개발되었다. 특히 윤곽공차의 경우 측정프로브의 반경의 효과가 배제되는 알고리즘을 개발하였다. 개발된 컴퓨터 모듈을 실제적인 측정작업에 적용하였으며, 고종도와 고효율성을 보임을 입증하였다.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2000.04a
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• pp.709-712
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• 2000

본 연구는 turbine compressor airfoil의 측정 및 검사 업무에서 edge(leading edge/trailing edge) 부위에서 자주 발생하는 프로브 slip현상으로 인한 측정 오차를 최소화하기 위하여 터빈 압축기의 airfoil 형상 규격에 대하여 살펴보고, 균일 샘플링방법을 이용하여 최소제곱법으로 보상하여 최적의 형상을 구하는 방법을 제시하고자 한다. 국내 기업에서는 airfoil형상의 edge부위를 검사할 때 leading edge부위의 타원 형상과 trailing edge부위의 원 형상을 AutoCAD상에서 임의로 그려서 규격을 검사하고 있다. 따라서 본 연구에서는 edge부위에서 발생하는 측정오차를 최소화하기 위하여 보다 정확하고 체계적인 fitting 방법을 도입함으로써, airfoil의 형상치수에 관한 규격검사 업무의 신뢰성과 효율을 향상시키고자 한다.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 1992.04b
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• pp.29-38
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• 1992

무인화된 대량생산 체제에서는 transfer line을 이용하게되며, cycle time의 단축을 위하여 측정 및 검사기능이 별도의 station으로 있어 가공후에 부품의 불량여부를 감지한다. 그러나 다품종소량생산체제에서는 FMC 또는 FMS가 적합하며, 이 시스템에 바람직한 감시기능으로서는 기내측정(inter-process)방식을 많이 이용한다. 여기서는 CNC선반과 머시닝센터에 접촉식 센서인 터치프로브(touch probe)를 설치하여 개발한 무인 FMC용 인터프로세스 3차원 측정 및 검사시스템을 소개한다.

• Proceedings of the KIEE Conference
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• 2007.04b
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• pp.40-42
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• 2007

우리는 새로운 시스템을 이용하여 고전압 측정장치를 제작하였다. 이것은 드레곤 시스템인데 높은 고전압을 직접 측정하지 않고 저항을 이용하여 분압기를 만들었다. 이는 저항값의 변화와 충전전압, 상승시간 등에 따라 얻어지는 결과가 다른 것을 확인하였으며 이를 교정할 수 있었다. 따라서 이를 이용한 결과 높은 고전압의 발생과 측정이 가능하였으며 여러 분야에서 이용가능할 것으로 여겨진다.

• Journal of the Korean GEO-environmental Society
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• v.12 no.1
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• pp.51-60
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• 2011

Electrical resistivity is applied for understanding details about layers and obtaining basic properties of soils to various measurement devices. The objective of this study is development of TRP(Temperature-compensated Resistivity Probe), analysis about effects of temperature changes during cone penetration test, and observation of characteristics of cone penetration. In order to observation of temperature changes according to a diameter difference of resistivity cone probe, the cone which has wedge type cone tip is made to two types, 2mm and 5mm. Temperature sensor is attached at 15mm below from cone tip because of an electrical interference with elecrical resistance probe. Delectrical connector is used to prevent electric disturbance between motor type penetrating machine and electrical resistivity cone probe. Application tests are carried out in acrylic cell whose diameter is 30cm with uniform Jumunjin sand according to densification caused by blows. The test results indicate that the temperature is increased uniformly during penetration and a tendency, characteristics of cone penetration, is discovered during altering state of soils. This study suggests that the temperature effects and characteristics of penetration should be considered in penetrating tests in order to conduct an accurate ground investigation using TRP(Temperature-compensated Resistivity Probe).

• Journal of the Korean Society for Precision Engineering
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• v.17 no.1
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• pp.129-137
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• 2000

In this paper, a new method of noncontact measurement has been developed for a 3 dimensional topography in semiconductor wafer, implementing a new optical probe based on the precision defocus measurement. The developed technique consists of the new optical probe, precision stages, and the measurement/control system. The basic principle of the technique is to use the reflected slit beam from the specimen surface, and to measure the deviation of the specimen surface. The defocusing distance can be measured by the reflected slit beam, where the defocused image is measured by the proposed optical probe, giving very high resolution. The distance measuring formula has been proposed for the developed probe, using the laws of geometric optics. The precision calibration technique has been applied, giving about 10 nanometer resolution and 72 nanometer of four sigma uncertainty. In order to quantitize the micro pattern in the specimen surface, some efficient analysis algorithms have been developed to analyse the 3D topography pattern and some parameters of the surface. The developed system has been successfully applied to measure the wafer surface, demonstrating the line scanning feature and excellent 3 dimensional measurement capability.

• Journal of Power System Engineering
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• v.10 no.3
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• pp.23-31
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• 2006

Mean velocities and turbulent characteristics in the three-dimensional flow fields of a gun-type gas burner were measured by using triple hot-wire probe (T-probe) in order to compare them with the results already presented by X-type hot-wire probe (X-probe). Vectors obtained by the measurement of two kinds of probes in the horizontal plane and in the cross section respectively show more or less difference in magnitude each other, but comparatively similar shape in overall distribution. Axial mean velocity component along the centerline shows that the value by T-probe is about ten times smaller than that by X-probe above the range of X/R=3. Also, the axial component of turbulent intensity along the centerline appears the biggest difference between the two probes. Moreover, axial mean velocity component, axial turbulent intensity component and rotational along the Y-directional distance show a big difference between slits and swirl vanes. On the whole, the values by T-probe appear smaller than those by X-probe.