• 한국공작기계학회논문집
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• 제14권2호
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• pp.55-61
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• 2005

The machining Parts must be Produced within the specification of drawing and those will be able to meet faction and efficiency. At that time, it is very important not only precision machine and machining technique but also the measurement technique. So, the improvement of measurement technique is to be joined together at once with improvement of machining technique. Finally, the quality and value of the parts are decided by precision measurement. This paper aims to study on the measurement uncertainty when the machined parts are inspected with 3-dimensional coordinate measuring machine. The objectives remove an error of measurement and remove a quality of mass products.

• 한국윤활학회:학술대회논문집
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• 한국윤활학회 1998년도 제28회 추계학술대회
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• pp.11-16
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• 1998

Condition monitoring technique used in the military is JOAP, for which the spectroscopic analysis is applied. However it is known that the technique has some problems in economical and practical point of view. This study introduces a new technique for measuring wear in real time base and applies the technique to a high power semi-automatic transmission. The results show the feasibility by measuring the concentration of ferrous wear particles from the transmission oil.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2004년도 추계학술대회 논문집
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• pp.3-9
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• 2004

The machining parts must be produced within the specification of drawing and those will be able to meet function and efficiency. At that time. it is necessary not only precision machine or machining technique but also the measurement technique is very important. So. the improvement of precise measurement technique is to be joined together at once with improvement of product technique. Finally. he quality and value of the parts are decided by precision measurement. This paper aims to study on he measurement uncertainty when the machined parts are inspected with 3-dimensional coordinate measuring machine. The objectives are to remove an error of measurement and to improve quality and productivity of the mass products.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제13권1호
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• pp.44-52
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• 1991

하악골의 발육이상과 더불어 상악골의 수평적 및 수직적 발육이상이 동반되어 있는 대부분의 악안면 기형 환자에서 상하악골을 동시에 재위치시키는 "상하악골 동시 이동 수술"은 현재 악교정 수술에서 보편화되어 있는 술식으므로, 이 경우 수술중에 일차로 상악골의 정확한 위치를 얻는 것이 매우 중요하다. Le Fort I 수평골절단술을 이용한 상악골의 재위치시 위치 이동의 정확성을 기하기 위하여 고전적으로 사용되어온 계측방법인 내부계측법(Intrnal measuring technique)은 최근에 이르러 계측상의 삼차원적 오차에 따른 정확도에 많은 의문이 제기되어 왔으며, 따라서 이를 보완하기 위하여 1985년 Johnson 이 처음으로 외부계측법(External measuring technique)을 소개한 이후로, Van Sickels 등의 여러 학자들에 의하여 그 사용의 유용성 및 정확성이 입증되어 왔다. 이에 저자등은 최근 2년간 본 교실에서 경험상 상${\cdot}$하악골동시이동 악교정수술환자중, 외부계측법에만 의존하여 상악골 이동량을 술중 계측했던 17명의 환자에서 수술전 이동계측량과 수술후 이동된 결과를 Lateral cephalometics상에서 전치부와 구치부의 수직 및 수평적 이동 오차 관계로, P-A cephalogram 상에서 수평적 이동 및 상악치열의 중심선 변위에 대한 이동 오차 관계로 분석하여 외부계측법에 의한 수술적 이동의 정확도를 평가하므로써 향후 이 방법의 사용에 대한 신뢰성을 보고자 본 연구를 시행하였다. 연구 결과로써, 상악골의 수직 및 수평적 이동시 외부계측법 만을 이용한 경우, 수술전 이동량에 비해 비교적 신뢰성 있게 상악골을 원하는 위치로 이동시킬 수 있는 것으로 사료되나, 대체적으로 전하방 및 우측으로 위치되기 쉬운 경향을 보여주었으며, 정면상의 수평기울기(transverse plane)에 대한 편차는 수술자에 의해 크게 영향을 받지 않았으나 상악치열의 중심위는 수술자에 의해 영향을 받은것 같다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1995년도 춘계학술대회 논문집
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• pp.120-123
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• 1995

Maxwell-Displacement-Currnt-Measuring Technique(MDCM) is a simple system for displacement current measuring which consist with two electrodes to the electrometer, With this method, the displacement current flow only when the electric flux density change by the displacement of molecules or charge particles of membrance on the water surface. Thus, It is Possible to detect dynamic behavior of molecules of membrane without any electrical contact with molecule membrane. In this paper, We measure surface pressure, displacement current and dipole moment of phospholipid monolayers on the wafer surface with applied pressure by MDCM and We measured DTA(differential thermal analysis).

• 한국광학회지
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• 제4권2호
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• pp.212-219
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• 1993

다중모드 레이저의 모드에 의해 광대역 CARS 분광에 생기는 모드 잡음을 줄이기 위하여 색소레이저의 증폭자발방출을 스톡스광으로 사용하여 CARS 분광을 측정하였다. 측정된 광대역 CARS 분광에 생기는 분광의 변조 폭에서 미량기체의 농도를 계산하는 새로운 방법을 제안하였으며, 변조 폭을 미랭기체의 농도와 기체 온도 변화에 대하여 수치적으로 계산하고 이를 분석하여, 계산된 변조 폭을 농도와 온도에 대한 함스로 기술하였다. 이러한 방법을 Ar과 미량의 CO 혼합기체를 셀에 넣고 CO 농도를 측정하여 검정하였으며, 실제로 응용하여 대향류 버너의 불꽃 속의 CO 농도 분포측정에 응용하였다.

• 한국해양공학회지
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• 제23권3호
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• pp.53-58
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• 2009

A scale model test for ship Infra-Red signature measurements at sea is impossible, because it is sensitive to the environment. Since we can't control the meteorological environment of the real sea, it can't be carried out with the desired maritime environments. Therefore, in the sea, we made measurements of the weather, operating conditions of the ship, and ship IR signatures under given conditions, and then analyzed them. Conversely, we compared the results of the test with a prediction for a given scenario condition. This paper describes the test items, procedures, and measuring instruments of the experiments at sea and the results from basic researches for methods of estimation and analysis of the measured data.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2000년도 추계학술대회 논문집
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• pp.76-80
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• 2000

This paper describes a coordinate measuring technique based on optical triangulation using the two images. To overcome the defect of structured light system which measures coordinate point by point, light source is replaced by CCD camera. Pixels in CCD camera were considered as virtual light source. The overall geometry including two camera images is modeled. Using this geometry, the formula for calculating 3D coordinate of specified point is derived. In a word, the ray from a virtual light source was reflected on measuring point and the corresponding image point was made on the other image. Through the simulation result, validation of formula is verified. This method enables to acquire multiple points detection by photographing.

• 제어로봇시스템학회논문지
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• 제9권3호
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• pp.227-235
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• 2003

We propose an algorithm for the automatic measurement of concentricity and roundness using image processing technique. The proposed measuring method consists of the preprocessing process and the measuring process. In the measuring process, two types of concentricity measurement algorithm and one type of roundness measurement algorithm are proposed. We could measure the concentricity and roundness using input image from CCD camera, without using special measurement equipment. From the experimental results, we could find that the required measurement accuracy specification is sufficiently satisfied using our proposed method.

• 한국자기학회지
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• 제5권5호
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• pp.387-390
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• 1995

We have developed a new method for measuring the M-H hysteresis loop of a spheroid-shape magnetic material having a uniaxial anisotropy and discussed its accuracy at fields near the coercivity. Our torque magnetometric method simultaneously gives the saturation magnetization and the remnant magnetization. Furthermore, the coercivity depending on the applied field orientation is accurately measured by this simple technique. An accuracy of the present method is negligibly affected even at fields near the coercivity, where the magnetization is not uniform. The technique makes a torque magnetometer an extremely high sensitive tool for measuring M-H hysteresis loop.