• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 1997.04a
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• pp.48-53
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• 1997

Electronic Speckle Pattern Interferometry(ESPI) using the Model 95 Ar laserm, a video system and an image processor was applied to the in-plane displacement measurements. Unlike traditional strain gauges or moire method, ESPI method requires no special surface preparation or attachments and can be measured in-plane displacement with no contact and real time. In this experiment wpecimen was loaded in parallel with a loadcell. The specimen was the cold rolled sdteel sheet of 2mm thickness, which was attached strain gauges. The study provides an example of how ESPI have been used to measure strain displacement in this specimen. The results measured by ESPI have been used to measure strain displacement in this specimen. The results measured by ESPI have been used to measure strain displacement in this specimen. The results measured by ESPI compare with the data which was measured by strain gauge method in tensile testing.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.04a
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• pp.366-367
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• 2017

생체인식 기술의 발달에 의해 생체 인증 수단 또한 늘어남에 따라 사용자의 얼굴을 이용한 인증방법이 점차 실용화 되어가고 있다. 그러나 주변 환경에 제약받을 경우 완벽한 인식률을 보여주지 못하는 경우가 발생한다. 본 논문에서는 기존의 얼굴인식 방법의 오탐지 부분에 대한 개선방법을 제안 하고자 하였다. 디지털 영사식 방법을 통한 무아레 현상을 얼굴인증에 접목시켜 보다 정확한 얼굴 인증을 진행할 수 있도록 개선된 인증 방법을 제시한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.11a
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• pp.339-341
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• 2017

최근 생체인식 서비스가 지속적으로 보급되고 있으나 그에 대한 보안의 문제에 대해서는 개선되고 있지 않는 상황이다. 본 논문에서는 생체인식 보안에 대해서 개선방안을 제안하고자 한다. 무아레 생체 인증의 보안성을 개선하기 위하여 퍼지 추출기를 이용해 무아레 생체 인증의 보안성을 효율적으로 개선하고, 기존에 있던 무아레 생체 인증 보안성과 퍼지 추출기를 이용한 무아레 생체 인증의 보안을 비교하는 방향을 제시한다.

• Proceedings of the Korean Institute of Interior Design Conference
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• 2006.11a
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• pp.151-155
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• 2006

The objective of commercial space design is not only to sell goods but also provide customer experience so called 'Experience marketing'. Therefore, companies are in search for various methods to give special customer experience and interior design is being considered as an important tool. For example, providing catharsis through commercial interior design, or bringing In the concept of hands-on exhibition into sales area relate to affirmative images of specific products or brands. Graphics in various methods has now become important interior design medium of expression. Therefore the study investigates graphical methods that appear in interior space such as objet, frame, optical illusion, moire and information transmission. It also analyzes their applications and roles in commercial spaces as major element in establishing spatial identity.

• Transactions of the Korean Society of Mechanical Engineers
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• v.18 no.5
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• pp.1182-1191
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• 1994

This paper presents an enhanced method of slit beam projection intended for the rapid measurement of 3-dimensional surface profiles of dies and molds. Special emphasis is given to optimizing the design of optical system so that the measuring accuracy can be maximized by adopting two-plane camera calibration together with sub-pixel image processing techniques. Finally, several measurement examples are discussed to demonstrate that an actual measuring accuracy of $\pm$ 0.2 mm can be achieved over the measuring range of 500 mm{\times}300mm{\times}200mm$.

• Proceedings of the KSME Conference
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• 2007.05a
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• pp.1673-1678
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• 2007

The use of flip-chip type electronic package offers numerous advantages such as reduced thickness, improved environmental compatibility, and downed cost. Despite numerous benefits, flip-chip type packages bare several reliability problems. The most critical issue among them is their electrical performance deterioration upon consecutive thermal cycles attributed to gradual delamination growth through chip and adhesive film interface induced by CTE mismatch driven shear and peel stresses. The electronic package in use is heated continuously by itself. When the crack at a weak site of the electronic package occurs, thermal deformationon the chip side is changed. Therefore, we can measure these micro deformations by using Moire interferometry and find out the crack length.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.28 no.9
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• pp.1276-1283
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• 2004

This study is an inspection of press forming product and mould using reverse engineering system. The inspection process on production field involves a lot of errors because of the hand-work so we focussed on improving the measured precision through performing the effective inspection using 3D non-contact scanner. By so doing that, we improved the precision of press forming product by analyzing the cause following the inspection result. Through the inspection, we applied it to the reverse engineering and we could improve the inspection process.

• Journal of the Korean Society of Clothing and Textiles
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• v.21 no.2
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• pp.430-441
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• 1997

Journal of the Korean Society of Clothing and Textiles Vol. 21, No. 2 (1997) p. 430∼441 Clothing fitness is strongly required in the apparel industry, and draping is an effective tool to increase fitness to the wearers. A more sophisticated and systematic information of the somatotype, accordingly, is necessary for better dress form design. This study was performed to provide fundamental data on middle-aged women's somatotypes for dress form designers by classifying the torso somatotype and analyzing the characteristics of their somatotype. The subjects were directly measured anthropometrically and indirectly analyzed photo- graphically. Data were analyzed by factor analysis, cluster analysis and analysis of variance. On the basis of the cluster analysis, using 7 factors cores the subjects were classified into four groups and four dress forms for middle-aged women were constructed. 8y the analysis of moire topography of proposed dress forms that were constructed according to the characteristics and silhouettes of front and lateral views for each somatotype of subjects, three-dimensional characteristics of somatotype and overlapped crosssection diagrams were analyzed.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2013.11a
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• pp.237-238
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• 2013

The quality of document image captured from electronic display might be worse when it is compared with document image captured from paper. The problem appears because of Moir? noise. This problem can lead to achieve inaccurate intermediate result for further image processing. This paper proposes a method to remove Moir? noise of document images captured from electronic display. The proposed algorithm is separated in two parts. In the first step, it corrects the text area region (foreground) with small area of smoothing. Then, it corrects the background area with large area of smoothing.

• Journal of Institute of Control, Robotics and Systems
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• v.15 no.8
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• pp.798-803
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• 2009

This paper proposes a grating scanner which is driven by a stack-type piezoelectric element. The mechanism of the grating scanner is based on flexure hinges. Using some constraints, the compliant mechanism is designed and then verified by Finite Element Analysis. The designed compliant mechanism is manufactured by wire electro-discharge machining, and then integrated with a stack-type piezoelectric element for actuation and a capacitance displacement sensor for measuring ultra-precision displacement. Experiments demonstrates the characteristics and the performances of the grating scanner using the terms of working range, resonance frequency, bandwidth and resolution. The grating scanner is applicable to a Moire interferometry for measuring 3-dimensional microscopic surface.