• 한국압력기기공학회 논문집
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• 제6권1호
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• pp.23-28
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• 2010

To enhance the reliability of ultrasonic testing system, MOST(Ministry of Science and Technology) bulletin 2004-13 was published in 2004.6 requiring performance demonstration in ultrasonic examination and MEST(Ministry of Education, Science and Technology) 2009-37 was published in 2009.9(formerly MOST bulletin 2004-13). In order to meet the MEST bulletin requirement and increase the reliability of ultrasonic testing, all the ultrasonic examination procedure and equipment should be performance demonstrated and qualified. In this paper, generic procedure for the ultrasonic examination of dissimilar metal welds are described and new technique are introduced.

• 한국방사선학회논문지
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• 제11권4호
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• pp.213-219
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• 2017

본 연구의 목적은 초음파 검사실의 검사환경 설정에 있어 실증적인 기초자료를 제공하는 것에 그 목적을 두고 새로운 초음파 검사실의 검사환경을 설계함에 있어 검사실의 적정조도를 설정하는데 기초자료로 제공하고자 한다. 방법으로는 부산에 소재하고 있는 종합병원 6군데 48곳의 초음파 검사실을 대상으로 조도와 관련된 초음파실 환경을 조사하고 초음파 검사대상자에게 초음파 검사실 환경에 대하여 설문조사를 실시하였다. 결과로는 초음파 검사실 차폐체의 종류에서는 성별, 연령별, 검사부위에 따른 분석에서 모두 Door+Curtain에서, 광원의 종류에서는 LED, 광원조절기가 필요하다에서 점수가 높게 나타났다. 초음파 검사실 환경조사에서는 초음파 검사실 조도 밝기는 평균 10 Lux로서 WHO와 CEC에서 권고하는 조도 밝기범위에 포함되고 있었으며 초음파 검사 대기실 조도 밝기(초음파 검사 대기실, 복도)는 평균 300~800 Lux를 나타내어 KSA 3011에서 권고하는 병원의 조도환경인 300 Lux이상을 만족하였다. 결론적으로 초음파 검사 대상자의 일반적인 배경과 초음파 검사실 관련 환경 요인을 분석한 결과를 토대로 향후 초음파 검사실 환경을 개선하거나 새로운 검사실을 설계함에 있어 기초자료로 제공하고자 한다.

• 한국압력기기공학회 논문집
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• 제5권1호
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• pp.14-19
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• 2009

NDE(Nondestructive examination) detects a flaw or discontinuity in materials. Flaws detected by the examination shall be evaluated for the decision basis of the integrity. The internal flaws of forging products can be detected by UT. However, UT has detection limits because of its reflected signal weakness. Normally, a 1mm or less flaw is known as the limit. If a flaw was detected, the size of flaw would be evaluated by AVG(or DGS) technique. To verify the evaluation data, alternative examination methods are needed. But there is no alternative examination methods until now. In this study, Phased array ultrasonic technique can be used to size the flaws in the generator rotor with focused beam of ultrasonic wave as a supplement method of AVG. Also, the phased array ultrasonic technique described enables the shape of flaw to be depicted exactly.

• 한국압력기기공학회 논문집
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• 제6권1호
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• pp.9-15
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• 2010

This paper describes the Visual Tool for automatic ultrasonic examination that is under developing as a part of the project for development of automatic ultrasonic wave acquisition and analysis program. This tool that is supported by various image processing techniques will be adopted to detect the flaws in the component and piping welds in NPP. Visual Tool will enhance the integrity of nuclear power plant. The object of this paper is to address the Visual Tool which is developing for automatic ultrasonic inspection of welds in NPP.

• 비파괴검사학회지
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• 제3권1호
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• pp.19-25
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• 1983

Some studies have been made on the effects of the attenuation on the result of ultrasonic examination of austenitic stainless steel weldment and also on the cause of false indications. The differences in the amplitudes and the metal paths of the ultrasonic examinations have been measured experimentally, for two kinds of waves, one passed through only the parent material and the other one through the weldment. The effect of probe angles and frequency on the examination data have been investigated using the shear wave. It has been found that the false indications were caused by back reflection from the weld metal surface due to the characteristics of ultrasonic wave propagation. It has been confirmed that the probe of $2.25\;MHz\;and\;60^{\circ}$ is the best choice in the ultrasonic examination and that the correction of amplitude for attenuations is necessary.

• 비파괴검사학회지
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• 제30권4호
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• pp.317-323
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• 2010

원자력발전소 배관 용접부에 대한 수동 초음파검사는 KPD(Korean Performance Demonstration)의 일반 절차서를 사용하여 기량 검증을 인정받고 있으나, 자동 초음파검사의 경우에는 일반 절차서가 없으며 해당 자동 검사 장비를 이용하여 절차서 기량 검증을 받아야 한다. 현재까지 국내에서 수행되고 있는 자동 초음파검사에 대한 절차서 기량검증은 대부분 펄스-반사기법을 적용한 절차서이나, 최근에 각광받고 있는 위상배열 초음파검사 기법을 이용한 절차서 기량검증은 국내에서 시행된 사례가 전무하다. 본 연구에서는 원자력발전소 가동중검사에 위상배열 초음파검사 기법을 적용하기 위하여 위상배열 초음파 신호취득 및 평가 소프트웨어를 개발하고 위상배열 초음파 탐촉자 및 웨지를 설계 하였다. 개발된 절차서에 대하여 결함 검출, 길이 및 크기 측정에 대한 기량검증을 수행하였으며, 검증된 위상배열 초음파탐상검사 절차서는 향후 원자력발전소 배관 용접부 검사에 적용할 예정이다.

• 대한한방부인과학회지
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• 제35권2호
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• pp.16-27
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• 2022

Objectives: The purpose of this study is to analyze educational effect of ultrasound examination training with ultrasonic phantom in the department of Korean Medicine Obstetrics and Gynecology. Methods: All 4^th grade students in 2021 and 2022 of school of Korean Medicine, Dong-Shin University must be trained in the department of Korean Medicine Obstetrics and Gynecology according to ultrasound examination training guideline including Objective Structured Clinical Examination (OSCE). After completing ultrasound examination training, we distributed questionnaires to them about a confidence before OSCE and after OSCE, difficulty in using ultrasound, ultrasound reading, difficulty with probe manipulation and computer operation, ultrasound understanding, clinical usefulness. And then, we analyzed the related factors including descriptive statistics, frequency analysis, student's t-test and paired t-test by SPSS 12.0. Results: Confidence in using ultrasound showed differences among students by gender and year, but it was not statistically significant. The difficulty of ultrasound use and ultrasound reading was at a moderate level, and the gender difference was not significant, and the difference between the practical students by year was statistically significant. The difficulty of the operation of the ultrasonic probe was at a normal level, and the difference between the students in practice by gender and year was not statistically significant. Although they answered that they had a very good understanding of the use of ultrasound, there was a gender difference and it was statistically significant, and practical students by year was not statistically significant. They answered that the effect on clinical use was very sufficient, but it was not statistically significant. The appropriateness of the practice time was evaluated at a moderate level. Conclusions: The use and educational effect of ultrasound examination using ultrasonic phantom in the department of Korean Medicine Obstetrics and Gynecology clinical practice education was very effective.

• 보험의학회지
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• 제2권1호
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• pp.245-252
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• 1985

Ultrasonographic examination in the obstetrics not only makes easy of the diagnosis of Hydrocephalus, placenta previa, anencephalus and ectopic pregnancy, etc, but also guaranteed its excellence in the diagnosis of women gynecology disease. Especially in case that it doesn't affect radiation hazard on the embryo, its efficiency keeps increasing and it is spotlighted to many clinic doctors. Even though in general hospital we often observe congenital hydrocephalus in Med. Dept. which entirly undergoes the medical examination to the insured, we don't observe even the women delivered with child and it is very difficult to find a rare congenital hydrocephlus throughout other present insurance companies. We inspected a congenital hydrocephalus, which other medical equipments of present insurance companies have many difficulties in the medical examination, accompanied by meningoencephalocele by ultrasonic diagnosis. We analyzed and compared the data by ultrasonic diagnosis with that of surgical diagnosis and the results are follows; 1) We could correctly describe meningoencephalocele by ultrasonic diagnosis. 2) It was able to be diagnosed in LMP 22 weeks. 3) BPD has about 10 mm higher than normal value in LMP 22 weeks. 4) Dilatation of lateral ventricle was observed in LMP 22 weeks. 5) As paralled with ultrasonic diagnosis in pregnancy medical examination, accepting declines including the risk rate can be restrained.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 B
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• pp.988-989
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• 2006

The ultrasonic welding is with features of high electric conductivity and hot conductivity when it is used in metallic bond, high electric conductivity and hot conductivity when it is used in various metallic bonds, excellent quality when it is used for advanced junction, easiness when it is used in various metallic bonds, being needless for the exhaustive material and being benefit for the environment. Currently the use of ultrasonic welding is increasing in the industrial fields such as the automobile battle, the refrigerator, the air conditioner, the battery and the solar cell junction. But the production ability is insufficient in our country and it is necessary to explore the core technology of the ultrasonic welding. In this paper, the output LC resonance filter and 35kHz squal wave onion occurrence Full Bridge plans was designed. The output examination of the ultrasonic oscillator and the ultrasonic welding examination were done. The method for getting more smooth result in the ultrasonic welding machine system was researched.

• 비파괴검사학회지
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• 제34권5호
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• pp.384-389
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• 2014

본 논문에서는 국내 원자력발전소 초음파검사자 기량검증시험 결과를 검토하였다. 원자력발전소 안전관련 설비에 대한 초음파검사 기량검증 요건은 ASME B&PV Code Section XI 1989 겨울 부록에서 최초로 언급되었다. 한국수력원자력(주)은 ASME Code Section XI, Appendix VIII의 요건 적용을 위해 국내 원자력발전소에 적합한 한국형 초음파검사 기량검증(KPD) 시스템을 개발, 규제기관의 승인을 받아 2004년 7월부터 운영하고 있다. 본 논문에서는 2004년부터 2013년까지 수행한 초음파검사자 기량검증시험 결과의 검토 내용으로 초음파검사 결함 검출 향상 및 기량훈련시스템 연구 개발에 도움을 줄 것으로 기대한다.