• 한국정보디스플레이학회:학술대회논문집
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• 2005.07a
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• pp.705-709
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• 2005

In order to clarify the heat annealing process for Magnesium Oxide (MgO), cathodoluminescent (CL) analysis was performed. Our results in the present work prove that the heat annealing has effects on not only removing water from the surface of MgO, but also increasing density of O and Mg defect pairs. It is the first work that the influence of annealing process on physical properties of the vacuum evaporated MgO thin films by using CL spectra.

• Proceedings of the KIEE Conference
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• 1994.07a
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• pp.122-124
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• 1994

The purpose of this paper is to attract electrical and electronic engineering community's attention to electromagnetic nondestructive testing (NDT). Various electromagnetic NDT methods of detecting defects in materials are presented to help understand the underlying physics associated with these techniques. This understanding would provide a way to interpret the test signal to describe about the defect. In the meantime, the author hopes, one may realize how perfectly fit such a subject as electromagnetic NDT is to current curriculums of electrical and electronic engineering.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 1998.04a
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• pp.229-236
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• 1998

Port structures are one of the important infrastructure of the nation. To ensure safety and extend lifetime of the existing port structures, it is necessary to develop proper maintenance program. In this study, port inspection manual for pier type structure are developed. The flow of inspection program is designed and defect type for each component of wharf is classified. Also systematic method of rating and evaluation is developed together with conceptual design of port maintenance data base system.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.23 no.55
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• pp.13-24
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• 2000

6 sigma movement is the most prominent quality improvement methodology in practice. Measurement plays an important role in helping any organization improve quality. Therefore, the measurement systems analysis is the first step for the quality improvement of manufacturing process in 6 sigma movement. In this study, we investigate the effect of Gage Repeatability and Reproducibility(Gage R&R) in view of defect rate and process capability indices, and provide guidelines for acceptance of gage repeatability and reproducibility(%R&R) for six sigma quality.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2003.05a
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• pp.23-35
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• 2003

회전기계의 결함발생은 기계의 여러 상태변화에 의한 결과이며, 이 때 발생하는 증상(현상) 또한 다양하고 복잡하기 때문에 기계의 특성을 파악하고 원인을 추정하기 위해서는 매우 전문적인 지식과 오랜 경험이 필요하다. 실제 산업현장에서 사용되는 각종 회전기계들은 고성능화, 복잡화 및 전문가의 부족으로 인해, 결함발생 시 원인과 발생현상의 관계를 명확히 표현하기에는 어려움이 있다. 이에 최근에는 진단에 관한 전문적인 지식을 구조적으로 표현할 수 있는 전문가 시스템(expert system)의 도입을 위한 연구가 활발히 이루어지고 있다.(중략)

• Journal of Korean Society of Industrial and Systems Engineering
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• v.22 no.50
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• pp.363-372
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• 1999

This paper is to propose models for systematic classification and estimation of quality costs. Especially in this research, quality costs are categorized into three aspects, ie., conventional quality cost system, ZD(Zero Defect) quality cost system and Taguchi quality system. In conclusion, I hope that this study will have contribution to application of quality loss system for all the business in Korea.

• ETRI Journal
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• v.28 no.3
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• pp.355-363
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• 2006

This paper presents a low-cost RF parameter estimation technique using a new RF built-in self-test (BIST) circuit and efficient DC measurement for 4.5 to 5.5 GHz low noise amplifiers (LNAs). The BIST circuit measures gain, noise figure, input impedance, and input return loss for an LNA. The BIST circuit is designed using $0.18\;{\mu}m$ SiGe technology. The test technique utilizes input impedance matching and output DC voltage measurements. The technique is simple and inexpensive.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.1760-1761
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• 2007

액정 디스플레이(LCD)의 핵심 재료인 편광필름은 제조 과정이나 운반 과정에서 실오라기 같은 이물 및 찍힘 등의 결함이 발생하며 이를 사람이 육안으로 검사하고 있다. 본 논문에서는 이런 편광필름의 결함을 자동으로 검출하기위한 방법으로 히스토그램의 통계적 모멘트를 사용하여 주변 밝기에 따라 검사 영역의 밝기의 기울기를 구하고, 이를 통해 결함의 유무를 판단하는 편광필름 검사 방법을 제안한다.

• Polymer Science and Technology
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• v.25 no.3
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• pp.205-213
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• 2014

• Journal of the Korean Society for Precision Engineering
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• v.16 no.3 s.96
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• pp.145-153
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• 1999

This study has been performed to investigate the stress distribution around defects that behave as stress concentrators and fracture mechanical analysis for cracks initiatiating at stress concentrators. The stress distribution was analyzed using Finite Element Method and non dimensional stress intensity factor was determined by the mean stress method. In addition, stress interaction effects around defects and cracks were compared.