• Convergence Security Journal
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• v.15 no.3_1
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• pp.41-51
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• 2015

Human have more complicate and skilled ability for lying even cheat ourself. It is not easy to cheat unconscious things like sweat, eyes, or voice, but if some one cheat own self, he can cheat every of that. Lie is one of the way to spread our gene and our instinct make a lie. Every living organism even bacteria or virus use similar trick to survive. In human body, there are more complicate and profound mechanism for lying like breathe, sweat, eyes, face or voice. We can control some of that and make a fake, but it can't be perfect. Human also called 'Homo Fallax' cause we have a language and skill to lie with it. In present, we can detect lie with polygraph, but it has few weakness. So we try to use Vibraimage technology for resolve it. In this paper, we describe how to use Vibraimage for lie detection and the research history.

• Journal of Korean Ophthalmic Optics Society
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• v.17 no.2
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• pp.127-133
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• 2012

Perpose: The aim of this study is to investigate the measuring method in radius of eyeglasses lens curvature by using keratometer in noncontact method. Methods: A trial lens for vision test in diopter range from -9.00 D to -11.50 D were attached in front part of keratometer, after that we set eyeglasses lens at the place where eyeglasses lens is apart about 25 cm from front position of keratometer. We measured the radius of curvature from observation of clear mire image while the position of eyeglasses lens is changed in a small quantity. After that, we made some formulas for compensation of radius of curvature by using spherometer. Results: The radius of curvature was successfully measured by keratometer with trial lens in front part of it. The measured radius of curvature was changed to compensation value using spherometer data, and the 5 kind of linear equation to make compensation value was made. Any kind of lenses measured by using keratometer that trial lens was attached in front part of it, after that it was confirmed that the result of calculation from line equation is exact in error ratio below 3.5%. Conclusions: It was confirmed that radius of eyeglasses lens curvature can be measured by using keratometer by noncontact method, and the accuracy is higher than "lens measure".

• Journal of the Korean Society for Nondestructive Testing
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• v.28 no.1
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• pp.46-53
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• 2008

Ultrasonic C-scan technique is one of very popular techniques being used for detection of flaws in polymer matrix composite(PMC). However, the application of this technique is very limited for evaluation of defects in PMC fabricated by the automated fiber placement process. The purpose of this study is to develop a novel ultrasonic hybrid system based on nondestructive and non-contact ultrasonic techniques for evaluation of delamination in carbon/epoxy and carbon/PPS composite laminates. It was shown that the newly developed ultrasonic hybrid system based on dual air-coupled pitch-catch technique with ultrasonic scattering reflection concept could provide excellent image with higher resolution of delamination in PMC compared with the conventional pitch-catch method. It is expected that this ultrasonic hybrid technique can be applied for on-line inspection of flaws in PMC during the fabrication process.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.3 no.2
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• pp.18-24
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• 2010

On-board spectrophotometer has been widely used as a non-contact and non-destructive measurement system in many fields. In this study, we evaluated the effect with respect to the light of on-board spectrophotometer based on a comparison with the standard spectrophotometer and color information coordinate system. Red, yellow, green and blue color paper, which were the standard reflective color paper and Munsell color paper, were used for experiments. In order to compare between a standard spectrophotometer system and an on-board spectrophotometer system, each color paper was measured 20 times. We concluded that it is possible to develop a system regardless the effect of light if the light was supplied consistently and a calibration was performed exactly while we applied an on-board spectrophotometer to non-contact and non-destructive measurement system.

• Journal of the Korean Society for Nondestructive Testing
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• v.20 no.6
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• pp.545-554
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• 2000

Compton X-ray backscatter technique has been used to quantitatively assess the impact damage in quasi-isotropic laminated composites and to obtain a cross-sectional profile of impact-damaged laminated composites from the density variation of the cross section. An adaptive filter is applied to the Compton backscattering data for the reconstruction and noise reduction from many sources including quantum noise, especially when the SNR(signal-to-noise ratio) of the image is relatively low. A nonlinear reconstruction model is also proposed to overcome distortion of the Compton backscatter image due to attenuation effects, beam hardening, and irregular distributions of the fibers and the matrix in composites. Delaminations masked or distorted by the first few delaminations near the front surface are detected and characterized both in width and location, by application of an error minimization algorithm.

• 한국정보통신설비학회:학술대회논문집
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• 2007.08a
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• pp.231-234
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• 2007

와전류를 이용한 전위강하법은 시험체에 와전류를 비 접촉식으로 발생 시킬 수 있어 기존의 방식에 비해 결함 검출시 발생하는 오차를 줄일 수 있고 물체의 결함 검출신호의 신뢰성을 향상 시킬 수 있다. 본 논문에서는 와전류를 이용한 전위강하법의 전자기 유한요소해석을 수행하였다. 3차원 유한요소해석과정에서 해석시간을 단축시키기 위해 각 영역별로 MVP, ESP, RMSP, TMSP의 미지수 변수를 부여하여 유한요소해석을 수행하였다. 기존의 전위강하법에 와전류의 개념을 적용하기 위해서 주파수에 대한 결함 깊이의 영향과 결함에 대한 주파수에 대한 영향을 검토해본 결과 결함의 깊이가 깊어질수록 또한 높은 주파수에서 신호의 크기가 선형적으로 증가하는 패턴을 보였다. 연구결과 와전류를 이용하여 ACPD법을 시행할 경우 데이터 처리 과정과 실험 장비를 단순화 시킬 수 있어 결함 검사를 손쉽게 할 수 있을 것이라 예상된다.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2002.07a
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• pp.432-437
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• 2002

현재 비파괴 상태진단기술의 세계적인 연구동향은 비접촉식 시험기술, 실시간 광역기술, 고온 환경 하에서의 시험기술, 온라인 감시기술, 고감도, 고분해능, 소형화 및 무선통신기술 등을 개발하는 방향으로 연구가 활발히 진행되고 있다. 특히 고온 환경 하에서의 시험기술의 경우 철강공장 등에서 그 수요가 급증하고 있는데 반하여 국내의 경우 개발기술이 거의 전무하며 외국에서 전량 수입에 의존하고 있는 실정이다. 최근 여러 가지 다양한 복합재료와 공업용 재료들이 개발됨에 따라 이들 재료의 제작 공정이 복잡해질 뿐만 아니라 고온 및 고압의 공정조건이 요구되는 경우가 많다. 따라서 고온환경 하에서 재료의 특성을 비파괴적으로 검사할 수 있는 초음파 탐촉자가 요구된다고 하겠다. (중략)

• Journal of the Korean Society for Nondestructive Testing
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• v.21 no.5
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• pp.532-541
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• 2001

Developments of nondestructive evaluation techniques for reduction of strength or toughness by aging of material have been carried out, and the method using electrical resistivity is one of them. In this study, to examine the application of electrical resistivity to the evaluation of degradation of metallic alloy, ten different non-magnetic materials were selected as test materials. Electrical resistivities measured by DC two-point probe method and those measured by non-contact type eddy current method were compared with each other. In addition, to examine the application possibility of four-point probe technology in field, the electrical resistivities for 1Cr-lMo-0.25V steel measured by DC two-point probe method and four-point probe method were compared with each other Differences between two measured values for the 1Cr-1Mo-0.25V steel were 0.6%. Therefore, the four-point probe method can be applied to the estimation of the degradation of metallic alloy. ect.

• 한국정보통신설비학회:학술대회논문집
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• 2004.08a
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• pp.6-10
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• 2004

회전기기의 운전 상태에서 on-line 부분 방전시험은 고정자 권선의 절연상태를 검사, 평가 할 수 있는 중요한 수단으로서 이러한 부분방전시험을 통하여 회전기기 시스템의 사고예방을 위한 진단을 할 수 있다. 기존의 비접촉식 센서인 SSC는 부분방전 측정을 위하여 권선의 웨지 아래에 설치하는 방식으로 개발되어 [1], 설치가 불편하고 Global VPI 방식으로 제작된 소형 회전기에는 설치할 수 없는 단점이 있다. 본 논문에서는 소형 회전기에 사용가능한 저, 고주파용 부분방전 센서를 제안하였다. 웨지 위에 설치 가능한 SSC 형태의 마이크로스트립 센서 및 전송선로 이론을 이용한 2선 평행 전송선로 센서는 값이 싸고 소형 회전기에 설치할 수 있을 정도의 크기를 지니며, 기본적으로 센서의 구조가 고주파 웨이브가이드로서 고주파용 센서로 적합하다. 또한 저주파 신호를 검출하기 위한 센서로 로고우스키 코일 형태의 U 타입 센서는 와전류를 검출하는 센서로서 슬롯 외부에 설치 되어야 한다. 이러한 U 타입 센서와 마이크로스트립 센서 또는 2선 평행 전송선로를 동시에 설치할 경우 저, 고주파를 효과적으로 검출할 수 있다.

• Journal of the Korean Society for Nondestructive Testing
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• v.29 no.4
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• pp.344-350
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• 2009

The goal of this study is to introduce the theoretical background of acoustic nonlinearity in surface wave and to verify its characteristics by experiments. It has been known by theory that the nonlinear parameter of surface wave is proportional to the ratio of $2^{nd}$ harmonic amplitude and the power of primary component in the propagated surface wave, as like as in bulk waves. In this paper, in order to verify this characteristics we constructed a measurement system using contact angle beam transducers and measured the nonlinear parameter of surface wave in an Aluminum 6061 alloy block specimen while changing the distance of wave propagation and the input amplitude. We also considered the effect of frequency-dependent attenuation to the measurement of nonlinear parameter. Results showed good agreement with the theoretical expectation that the nonlinear parameter should be independent on the input amplitude and linearly dependent on the input amplitude and the $2^{nd}$ harmonic amplitude is linearly dependant on the propagation distance.