• Journal of the Korea Convergence Society
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• v.7 no.1
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• pp.105-111
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• 2016

The purpose of this study was to investigate effects of three pelvic floor muscle (PFM) exercises on the thickness of PFM and transverse abdominal muscle (TrA), the internal oblique muscle, and the external oblique muscle. The PFM and trunk muscles were measured using ultrasonography in 4 conditions.rest, conventional PFM contraction (Ex A), PFM contraction with hip adductor contraction (Ex B), and PFM contraction with real-time ultrasound imaging (Ex C). The thickness of PFM in Ex C showed a significantly more decrease compared to rest and others (all comparisons, p<.05). The thickness of TrA in Ex C showed a significantly more increase compared to rest and others (all comparisons, p<.05). This study would recommend the use of PFM contraction with real-time ultrasonographic imaging to improve women's incontinence.

• The Journal of Korean Orthopaedic Ultrasound Society
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• v.2 no.2
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• pp.107-112
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• 2009

Ultrasonographic examination for the rotator cuff disease is dynamic noninvasive study and the results is comparable to MRI on the behalf of recent development. It also can be used as a tool for guided injection and follow up study after rotator cuff repair. The development of equipment, learning curve and knowledge for the disease are the three most important factors for the critical role of the ultrasonography in the diagnosis and treatment of the rotator cuff disease.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39C no.2
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• pp.184-190
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• 2014

Until now ship communication micro serial network communication method is designed for the communication between the controller and the RS-422 communication on the international standard ISO 1993, but gradually progresses NMEA 2000 standardized fast Ethernet-based communications environments expected to be replaced. In addition, the ship's main instrumentation equipment versatility with ease gradually to control devices by monitoring and controlling are. Wind anemometer, ship mast end, where the highest wind farms typically install a separate console boxes, data loggers, indicators was required in order to manage them, to maintain them, to go through the procedures and cumbersome data update firmware were Therefore, in this paper, using the PC network, ultrasonic wind speed data processing system for implementing functional was expressed as a function of the technology elements, NMEA 2000 standard certified in separate operating console without the features of the data loggers, indicators, implementation by ultrasonic wind data processing system was implemented to minimize the maintenance cost of the operating system.

• Journal of the Korean Society for Nondestructive Testing
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• v.36 no.1
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• pp.53-59
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• 2016

Ultrasonic nonlinear evaluation is generally utilized for detection of not only defects but also microdamage such as corrosion and plastic deformation. Nonlinearity is determined by the amplitude ratio of primary wave second harmonic wave, and the results of its comparison are used for evaluation. Owing to the experimental features, the experimental nonlinearity result contains system nonlinearity and material nonlinearity. System nonlinearity is that which is unwanted by the user; hence, it acts as an error and interrupts analysis. In this study, a bulk wave mixing technique is implemented in order to minimize the system nonlinearity and obtain the reliable analysis results. The biggest advantage of this technique is that experimental nonlinearity contains less system nonlinearity than that for the conventional nonlinear ultrasonic technique. Theoretical and experimental verifications are performed in this study. By comparing the results of the bulk wave mixing technique with those of the conventional technique, the strengths, weaknesses, and application validity of the bulk wave mixing technique are determined.

• Journal of the Korean Society for Nondestructive Testing
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• v.13 no.2
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• pp.48-60
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• 1993

1974년에 유럽에서 시작된 PISC(Program for the Inspection of Steel Components ; PISC-I, II, III) 수행결과나 1980년대초 실시된 미국의 BWR 원전 배관계통의 입계응력부식균열(IGSCC ; Intergranular Stress Corrosion Cracks)검사결과에서 나타난 바와 같이 기존의 규격 요건과 절차에 따른 원자력발전소 기기에 대한 초음파탐상검사는 그 실효성에 많은 문제점이 제기되었다. 따라서, 원전기기의 건전성 및 초음파탐상검사 결과의 신뢰도를 보증하기 위한 각종 연구가 진행되고 여러 방안이 모색되어 왔다. 그 결과, 원전 가동중검사 규격에 "초음파탐상검사자 자격인정 요건"과 "초음파탐상검사 시스템(검사자, 장비 및 절차서)에 대한 기량검증 요건"이 새로이 부가되었다. 본고에서는 초음파탐상검사 결과의 신뢰도 확보에 있어 필수불가결한 요건인 원전기기 초음파 탐상검사 시스템에 대한 기량검증 요건을 자세히 기술한다.

• The Journal of Korean Orthopaedic Ultrasound Society
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• v.6 no.1
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• pp.28-37
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• 2013

Ultrasound is a first line examination of the knee and useful diagnostic tool in assessing the various knee lesions. The advantages of ultrasound are that it is non-invasive, easily available at bed side, cheap, well accepted by patients, and that it has technical benefits including dynamic evaluation. Its limitations include reliability, which is largely operator dependent and its inability to evaluate deep structures. Technical guidelines of the ultrasound released by European Society of MusculoSkeletal Radiology (ESSR) and ultrasonographic findings of various knee lesions are described.

• Proceedings of the KIEE Conference
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• 2008.10b
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• pp.484-485
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• 2008

초음파는 의학적 진단 및 치료의 목적으로 널리 사용되어 왔다. 일반적으로, 초음파 조사의 생물학적 무해성은 많은 연구를 통하여 보고되었으나, 최근 초음파 집속을 통한 강력 초음파의 사용에 대한 열적 안전성 평가가 중요한 요소로 대두되고 있다. 이에 본 연구에서는 강력 집속 초음파의 전달 에너지와 열적 분포를 측정하여 안전성 평가에 활용 가능한 초음파 열분포 팬텀을 제안하였다. 온도 분포 측정용 팬텀은 초음파 조직유사 팬텀 재료인 한천을 이용하였으며, 음향학적 특성의 유사성을 평가하였다. 온도 효과를 측정하기 위하여 $3{\times}3$의 형태로 온도 센서를 팬텀 내부에 배열하여 초음파 조사에 따른 온도 분포를 측정하였고 온도 측정을 위한 시스템을 개발하여, 초음파 가열 실험을 수행하였다. 본 연구에서 제안된 초음파 온도 분포 측정용 팬텀의 유용성을 확인하였으며, 온도 분포용 팬텀을 통한 강력 집속 초음파 장비의 열적 성능 평가에 적용 될 수 있을 것으로 사료되었다.

• Journal of the Korean Society for Nondestructive Testing
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• v.24 no.3
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• pp.275-281
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• 2004

Socket weldment used to change the flow direction of fluid nay have flaws such as lack of fusion and cracks. Liquid penetrant testing or Radiography testing have been applied as NDT methods for flaw detection of the socket weldment. But it is difficult to detect the flaw inside of the socket weldment with these methods. In order to inspect the flaws inside the socket weldment, a ultrasonic testing method is established and a ultrasonic transducer and automated ultrasonic testing system are developed for the inspection. The automated ultrasonic testing system is based on the portable personal computer and operated by the program based Windows 98 or 2000. The system has a pulser/receiver, 100MHz high speed A/D board, and basic functions of ultrasonic flaw detector using the program. For the automated testing, motion controller board of ISA interface type is developed to control the 4-axis scanner and a real time iC-scan image of the automated testing is displayed on the monitor. A flaws with the size of less than 1mm in depth are evaluated smaller than its actual site in the testing, but the flaws larger than 1mm appear larger than its actual size on the contrary. This tendency is shown to be increasing as the flaw size increases. h reliable and objective testing results are obtained with the developed system, so that it is expected that it can contribute to safety management and detection of repair position of pipe lines of nuclear power plants and chemical plants.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1581-1582
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• 2015

최근 많은 승객을 수공하는 대중 교통시스템의 안전에 대한 중요성이 더욱 대두되고 있으며, 고속화된 철도차량 또한 이를 피해갈 수 없다. 현재 철도차량의 사고 방지를 위해 많은 연구가 이루어 지고 있으며, 차량기지의 검수설비 및 검수시스템이 자동화되어 많이 발전되었다. 그 중 차축 초음파 탐상은 각 차량기지에 설치된 A-Scan 초음파 방식과 Phased Array 초음파 방식의 두가지 방식의 장비를 이용하여 차축 초음파 탐상이 이루어 지고 있다. 본 논문에서는 초음파 방식 중 철도차량 차축 결함 검출을 위한 A-Scan 탐상 방식과 Phased Array 탐상방식에 대하여 비교 분석하였다.

• Journal of the Korean Society of Radiology
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• v.13 no.1
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• pp.21-29
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• 2019

The purpose of this study was to compare the MI using SonoVue along with different machines output and to infer the meaning of the signal difference under the same condition. All of the comparative instruments showed strong signal values at early stage as MI value increased. Over time, the inter-instrumental signal values showed signal attenuation under all conditions except for 10 min of the condition of MI 0.1 of RS85A. E9 and EPIQ7 showed signal degradation due to microbubble collapse over time at all MI values. In the comparison of equipment, the signal strengths of MI 0.1, 0.2, and 0.4 were high in order of EPIQ7, RS85A and E9. In the quantitative analysis, there were statistically significant from the SNR and CNR that were obtained from RS85A and E9 (P-value<0.05). In the quantitative analysis, Epiq7 was statistically significant except for CNR as the MI value was changed In the contrast-enhanced ultrasound, even though MI value was low (MI <0.05), it will be helpful for diagnosis, controlling the MI and scan time because a difference in signal intensity was shown between the three machines.