• The KIPS Transactions:PartB
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• v.14B no.6
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• pp.407-412
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• 2007

The performance of ultrasonic testing systems for industrial or medical purpose largely depends on the performance of ultrasonic transducers. Generally, the information about an ultrasonic transducer performance characteristics are expressed by the ultrasonic R/F signal back from a reflector and its frequency characteristics in the data sheet provided by manufacturers. In case of focused ultrasonic transducers, the two pieces of information can, however, hardly assure that the focused ultrasonic transducer would produce well-focused C-scan images. Therefore, we propose the measured size of focal spot and the reconstructed shape of effective focal zone in the focused sound field as novel measures for the performance evaluation of the focused ultrasonic transducers. The process of getting the both measures of the transducers is conducted by the implemented software including sound field scanning and virtual 3D reconstruction functions which requires the echo of a point reflector. The proposed method could, otherwise impossible in the existing method, effectively and simply distinguish superior ones among many transducers made in the same specification and be also used to detect the performance degradation due to the aging of the transducers. Eventually, the quality of performance of the ultrasonic testing systems for industrial or medical purpose is secured.

• Journal of the Korean Society for Nondestructive Testing
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• v.15 no.2
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• pp.407-414
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• 1995

원자력발전소의 주요 기기들에 대한 가동중검사는 관련법규에 따라 철저히 수행되고 있다. 그러나 최근 선진국에서는 이에 만족하지 않고 원전 기기의 안전성을 더욱 확고히 하기 위해 기존의 가동중검사 요건을 계속 강화하고 있으며, 원전 관련 당사자들은 강화된 요건들을 충족시키기 위한 노력을 끊임없이 계속하고 있다. 이 글에서는 원전 기기 가동중검사 신규 요건들인 초음파탐상검사 시스템의 기량검증(Performance Demonstration) 요건, 비파괴검사자 및 초음파검사자 자격 인정 요건(ANSI/ASNT CP-189, Appendix VII of ASME Sec. XI), 증기발생기 전열관 와전류검사, 신호평가자 자격인정(Qualified Data Analyst : QDA), 미국규제기관(NRC)에서 발행하고 있는 NRC Bulletin, NRC information 등의 가동중검사 관련 사항들을 살펴보고 선진 외국에서는 이들 요건 및 정보에 대해 어떻게 대처하고 있는가를 알아본다. 또한 국내에서도 이들 신규 요건에 대한 대처 현황과 대처 방안을 모색한다.

• The Journal of Korean Orthopaedic Ultrasound Society
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• v.6 no.1
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• pp.20-27
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• 2013

The anatomical structures of foot and ankle are more superficial than other body structures. The ultrasonographic examinations are easy and useful diagnostic tools in the foot and ankle field. The interpretation of ultrasonographic findings depends on the observer's experiences of sonographical anatomy. Repeated ultrasonographic examination of the foot and ankle can improved the skills in diagnosing the disease of the foot and ankle.

• Electric Engineers Magazine
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• s.129
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• pp.23-33
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• 1993

• The Monthly Technology and Standards
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• s.74
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• pp.25-29
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• 2008

• Transactions of the Korean Society of Mechanical Engineers A
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• v.41 no.1
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• pp.13-19
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• 2017

The use of ultrasonic surgery units and scalers are steadily increasing in the field of dentistry. Such units and scalers should be evaluated before they are commercialized because the mechanical performance and stability of equipment is crucial for patients. Hence, we created a hand-piece moving system that can test bone cutting and teeth scaling. The purpose of this study was to evaluate the teeth scaling performance of ultrasonic scaler unit. Additionally, we measured the temperature distribution and noise during the test. through an experimental test, we found that a high output of an Ultrasonic NX device can cause serious damage to the teeth surface, and it was not within range in heat generation distribution and noise test.

• Journal of the Korean Society for Nondestructive Testing
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• v.35 no.2
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• pp.134-140
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• 2015

Traditional moxibustion therapy can cause severe pain and leave scarring burns at the moxibustion site as it relies on the practitioner's subjective and qualitative treatment. Recently, ultrasound therapy has received attention as an alternative to moxibustion therapy owing to its objectiveness and quantitative nature. However, in order to convert ultrasound energy into heat energy, there is a need to precisely understand the ultrasound-focusing characteristics of the acoustic lens. Therefore, in this study, an FEM simulation was performed for acoustic lenses with different geometries a concave lens and zone lens as the geometry critically influences ultrasound focusing. The acoustic pressure field, amplitude, and focal point were also calculated. Furthermore, the performance of the fabricated acoustic lens was verified by a sound pressure measurement experiment.

• Proceedings of the KIEE Conference
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• 2006.04b
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• pp.173-175
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• 2006

소형화 되어 가는 전기기기에 따른 소형 모터가 요구되고 있다. 소형 모터 중 높은 정지 토크 및 높은 효율 등의 장점을 가진 소형 로터리 초음파 모터는 여러 목적에 쓰이고 있다. 하지만 주로 경험적인 방법 또는 상용 해석툴이 소형 로터리 초음파 모터의 해석에 주로 사용되었다. 따라서 소형 로터리 초음파 모터의 체계적인 해석 방법이 필요하다. 본 논문에서는 우선 소형 로터리 초음파 모터의 동작 원리를 통해 진행파의 존재를 확인하였고, 유한요소법 해석법을 통해 과도 및 정상 상태의 소형 로터리 초음파모터를 설계하고 해석하였다. 이 해석결과를 이용하여 소형 로터리 초음파 모터의 동작 특성 또한 해석하였다.

• The Optical Journal
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• s.119
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• pp.38-40
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• 2009

일성초음파산업(대표 천홍현/www.isucl.co.kr)는 1985년 설립이래 23년간 광학전문 세척기 한 분야에서 축적해온 전문 기술력을 바탕으로 이제는 세계로 뻗어나가는 수출업체로 입지를 굳혔다. 까다롭기로 소문난 일본의 호야를 비롯한 전 세계 글로벌 회사들과 협력관계에 있는 일성초음파산업은 세계적인 광학세척기 전문업체로의 힘찬 도약을 시동하고 있다.

• Journal of the Korea Society of Computer and Information
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• v.7 no.1
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• pp.80-87
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• 2002

In this papers, It was researched Automatic frequency detection which need using ultrasonic utmost effort. As far as ultrasonic Automatic frequency detection, It was analog method, In more dedicated field, to solve a limit. It was needed a new method detection instrument.